Tootfinder

Getting started with Shiny to make interactive web-apps with R: #rstats

Overview | Building Web Apps with R Shiny
This class will teach you the basics of Shiny app programming, giving you skills that will form the basis of almost any app you want to build. By the end of the class, you will have created a custom app that collects and saves data, allows users to dynamically visualize the data, and produces downloadable reports.

Edinburgh-based Wordsmith, whose AI tools help legal teams automate contract and policy reviews, raised a $25M Series A led by Index Ventures (Kyt Dotson/SiliconANGLE)
https://siliconangle.com/2025/06/04/wordsmith-ai-raises-25m-build-legal-a…

Wordsmith AI raises $25M to build legal AI for in-house teams - SiliconANGLE
Wordsmith AI raises $25M to build legal AI for in-house teams - SiliconANGLE

Viele Menschen verstehen #Warnungen wie „#Hitzeindex“ oder „#Hitzewarnung“ falsch. Das zeigt eine US-Studie.
Fast die Hälfte hält den Hitzeindex für die reine

Bridging the Gap between National Weather Service Heat Terminology and Public Understanding
Abstract Clearly communicating heat warning information to the public is an important way to reduce heat mortality and morbidity. However, heat communication interventions from the National Weather Service commonly include technical and scientific terms, otherwise known as jargon. These terms, such as heat advisory or heat index, may not be understood by the public. Given the importance of message understanding in protective action decision-making, the purpose of this study is to assess how the…

The @… crew are doing a group order of meshtastic wireless devices.
We've selected the Wismesh Pocket v2 plus a small card sized sensor / buzzer. These connect up to 7 hops and we'll be installing 2 solar powered repeaters in Gastown & Mt Pleasant (as well as direct between any two devices)
Fill out the form …

@… That's what I thought too! There seems to be some contention on this. From this https://www.timstinchcombe.co.uk/index.php?pge=diode &am…

Stop Chasing the C-index: This Is How We Should Evaluate Our Survival Models
Christian Marius Lillelund, Shi-ang Qi, Russell Greiner, Christian Fischer Pedersen
https://arxiv.org/abs/2506.02075

Stop Chasing the C-index: This Is How We Should Evaluate Our Survival Models
We argue that many survival analysis and time-to-event models are incorrectly evaluated. First, we survey many examples of evaluation approaches in the literature and find that most rely on concordance (C-index). However, the C-index only measures a model's discriminative ability and does not assess other important aspects, such as the accuracy of the time-to-event predictions or the calibration of the model's probabilistic estimates. Next, we present a set of key desiderata for choosing the ri…

Why Regression? Binary Encoding Classification Brings Confidence to Stock Market Index Price Prediction
Junzhe Jiang, Chang Yang, Xinrun Wang, Bo Li
https://arxiv.org/abs/2506.03153

Why Regression? Binary Encoding Classification Brings Confidence to Stock Market Index Price Prediction
Stock market indices serve as fundamental market measurement that quantify systematic market dynamics. However, accurate index price prediction remains challenging, primarily because existing approaches treat indices as isolated time series and frame the prediction as a simple regression task. These methods fail to capture indices' inherent nature as aggregations of constituent stocks with complex, time-varying interdependencies. To address these limitations, we propose Cubic, a novel end-to-en…

Are Pixel-Wise Metrics Reliable for Sparse-View Computed Tomography Reconstruction?
Tianyu Lin, Xinran Li, Chuntung Zhuang, Qi Chen, Yuanhao Cai, Kai Ding, Alan L. Yuille, Zongwei Zhou
https://arxiv.org/abs/2506.02093

Are Pixel-Wise Metrics Reliable for Sparse-View Computed Tomography Reconstruction?
Widely adopted evaluation metrics for sparse-view CT reconstruction--such as Structural Similarity Index Measure and Peak Signal-to-Noise Ratio--prioritize pixel-wise fidelity but often fail to capture the completeness of critical anatomical structures, particularly small or thin regions that are easily missed. To address this limitation, we propose a suite of novel anatomy-aware evaluation metrics designed to assess structural completeness across anatomical structures, including large organs, …

Indexing Tries within Entropy-Bounded Space
Lorenzo Carfagna, Carlo Tosoni
https://arxiv.org/abs/2507.02728 https://arxiv.org/pdf/250…

Indexing Tries within Entropy-Bounded Space
We study the problem of indexing and compressing tries using a BWT-based approach. Specifically, we consider a succinct and compressed representation of the XBWT of Ferragina et al.\ [FOCS '05, JACM '09] corresponding to the analogous of the FM-index [FOCS '00, JACM '05] for tries. This representation allows to efficiently count the number of nodes reached by a given string pattern. To analyze the space complexity of the above trie index, we propose a proof for the combinatorial problem of coun…

Pinching-Antenna-Assisted Index Modulation: Channel Modeling, Transceiver Design, and Performance Analysis
Shuaixin Yang, Yijia Li, Yue Xiao, Yong Liang Guan, Xianfu Lei, Zhiguo Ding
https://arxiv.org/abs/2507.02641

Pinching-Antenna-Assisted Index Modulation: Channel Modeling, Transceiver Design, and Performance Analysis
In this paper, a novel pinching-antenna assisted index modulation (PA-IM) scheme is proposed for improving the spectral efficiency without increasing the hardware complexity, where the information bits are conveyed not only by the conventional M-ary quadrature amplitude modulation (QAM) symbols but also by the indices of pinching antenna (PA) position patterns. To realize the full potential of this scheme, this paper focuses on the comprehensive transceiver design, addressing key challenges in …

A pictures says more than 1000 words. How much more can an audio representation of your data tell you? #rstats

sonify: Data Sonification - Turning Data into Sound
Sonification (or audification) is the process of representing data by sounds in the audible range. This package provides the R function sonify() that transforms univariate data, sampled at regular or irregular intervals, into a continuous sound with time-varying frequency. The ups and downs in frequency represent the ups and downs in the data. Sonify provides a substitute for R's plot function to simplify data analysis for the visually impaired.

Introducing a New Brexit-Related Uncertainty Index: Its Evolution and Economic Consequences
Ismet Gocer, Julia Darby, Serdar Ongan
https://arxiv.org/abs/2507.02439

Introducing a New Brexit-Related Uncertainty Index: Its Evolution and Economic Consequences
Important game-changer economic events and transformations cause uncertainties that may affect investment decisions, capital flows, international trade, and macroeconomic variables. One such major transformation is Brexit, which refers to the multiyear process through which the UK withdrew from the EU. This study develops and uses a new Brexit-Related Uncertainty Index (BRUI). In creating this index, we apply Text Mining, Context Window, Natural Language Processing (NLP), and Large Language Mod…

This https://arxiv.org/abs/2407.14272 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qfi…

Global Balance and Systemic Risk in Financial Correlation Networks
The global balance index is used in the network literature to quantify how balanced a signed network is. In this paper we show that the global balance index of financial correlation networks can be used as a systemic risk measure. We define the global balance index of a network starting from a diffusive process that describes how the information spreads across nodes in a network, providing an alternative derivation to the usual combinatorial one. The steady state of this process is the solution…

(1/3) Please join me today on Zoom at 12pm ET / 11am CT / 10am MT / 9am PT for "Beyond the Algorithmic Feed," a free MediaEd Club webinar for the Media Education Lab:
https://mediaeducationlab.com/index.php/events/beyond-algorithmic-feed
While som…

A refinement of the Lorentz local field expression with impact on the Clausius-Mossotti and Lorentz-Lorenz models
Jeroen van Duivenbode, Anne-Jans Faber
https://arxiv.org/abs/2506.01993

A refinement of the Lorentz local field expression with impact on the Clausius-Mossotti and Lorentz-Lorenz models
In the 19th century Mossotti and Clausius formulated an expression that relates electrical permittivity of a dielectric to the product of molecular polarizability and number density. Lorenz and Lorentz extended the use of that expression to also cover the dielectric s refractive index. These expressions successfully predict the change of the dielectric s permittivity and refractive index as a function of a wide range of its number density, using the consideration that molecular polarizability s…

Conventional and Fuzzy Data Envelopment Analysis with deaR
Vicente J. Bolos, Rafael Benitez, Vicente Coll-Serrano
https://arxiv.org/abs/2506.03766 https://…

Conventional and Fuzzy Data Envelopment Analysis with deaR
deaR is a recently developed R package for data envelopment analysis (DEA) that implements a large number of conventional and fuzzy models, along with super-efficiency models, cross-efficiency analysis, Malmquist index, bootstrapping, and metafrontier analysis. It should be noted that deaR is the only package to date that incorporates Kao-Liu, Guo-Tanaka and possibilistic fuzzy models. The versatility of the package allows the user to work with different returns to scale and orientations, as we…

Loose rectangular diagram, multi-crossing number, and arc index
Tetsuya Ito
https://arxiv.org/abs/2507.01404 https://arxiv.org/pdf/25…

Loose rectangular diagram, multi-crossing number, and arc index
For a non-split multi-crossing diagram $D$ of a link $L$ we show that $α(L)-2 \leq c_2(D) + \sum_{n> 2}(2n-4)c_n(D)$ holds. Here $α(L)$ is the arc index and $c_n(D)$ is the number of $n$-crossings of $D$. This generalizes and subsumes many known inequalities related to multi-crossing numbers. In the course of proof, we introduce a notion of loose rectangular diagram and show that a loose rectangular diagram can be converted to usual rectangular diagram preserving its arc index.

Tel Aviv-based Wonderful, which develops customer support AI agents for businesses in non-English speaking countries, raised a $34M seed led by Index Ventures (Yuliya Chernova/Wall Street Journal)
https://www.wsj.com/articles/wonderfu…

This https://arxiv.org/abs/2410.19585 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On the computation of accurate initial conditions for linear higher-index differential-algebraic equations and its application in initial value solvers
In contrast to regular ordinary differential equations, the problem of accurately setting initial conditions just emerges in the context of differential-algebraic equations where the dynamic degree of freedom of the system is smaller than the absolute dimension of the described process, and the actual lower-dimensional configuration space of the system is deeply implicit. For linear higher-index differential-algebraic equations, we develop an appropriate numerical method based on properties of …

This https://arxiv.org/abs/2504.21386 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Power Suppression and Lensing Anomaly -- A phenomenological investigation
Primordial power spectra with low power at long wavelengths can alleviate lensing anomaly. However the extent to which data favours such a primordial spectra is not clear. In this work, we investigate power suppression and related mitigation of lensing anomaly with the help of phenomenological models which are valid over scales of interest. We consider simple extensions to nearly scale invariant power spectra such as those which includes running and running of running of spectral index. We perf…

Animals are abused and exploited in various ways for the sake of entertainment. LCA strongly opposes the use of animals in entertainment.
Animals have their own needs, interests, and rights, especially the right to engage in their natural behaviors in their natural habitat. https://www.lcanimal.org/…

Distinguishing True Influence from Hyperprolificity with Citation Distance
Lu Li, Yun Wan, Feng Xiao
https://arxiv.org/abs/2506.03527 https://

Distinguishing True Influence from Hyperprolificity with Citation Distance
Accurately evaluating scholarly influence is essential for fair academic assessment, yet traditional bibliometric indicators - dominated by publication and citation counts - often favor hyperprolific authors over those with deeper, long-term impact. We propose the x-index, a novel citation-based metric that conceptualizes citation as a process of knowledge diffusion and incorporates citation distance to reflect the structural reach of scholarly work. By weighting citations according to the coll…

This https://arxiv.org/abs/2503.16512 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csHC_…

Multimodal Sensing and Machine Learning to Compare Printed and Verbal Assembly Instructions Delivered by a Social Robot
In this paper, we compare a manual assembly task communicated to workers using both printed and robot-delivered instructions. The comparison was made using physiological signals (blood volume pulse (BVP) and electrodermal activity (EDA)) collected from individuals during an experimental study. In addition, we also collected responses of individuals using the NASA Task Load Index (TLX) survey. Furthermore, we mapped the collected physiological signals to the responses of participants for NASA TL…

My question about the PTSN switch-off campaign is: can BT not already *detect* (over the course of a year) which customers are using alarms or telecare devices likely to be impacted?
https://www.ispreview.co.uk/index.php/2025

Government Hails Start of National Campaign for UK Digital Phone Switch
The UK government has today hailed the start of a new national campaign, funded by broadband giants BT and Virgin Media, which aims to help support and encourag

On the proofs of Leighton's Graph Covering Theorem and a notion dual to commensurability
Nicholas Touikan
https://arxiv.org/abs/2507.01839 https://

On the proofs of Leighton's Graph Covering Theorem and a notion dual to commensurability
Leighton's Graph Covering Theorem states that if two finite graphs have the same universal covering tree, then they also have a common finite degree cover. Bass and Kulkarni gave an alternative proof of this fact using tree lattices. We give an example of two graphs that admit a common finite cover which can not be obtained using tree lattice techniques. The argument naturally leads to the question of when a commensuration can be induced by an embedding into a common finite index overgroup. We …

A Combinatorial Study of the Fixed Point Index
Jes\'us A. \'Alvarez L\'opez, Alejandro O. Majadas-Moure, David Mosquera-Lois
https://arxiv.org/abs/2505.24530

A Combinatorial Study of the Fixed Point Index
We introduce a theory of integration with respect to the fixed point index, offering a substantial improvement over previous approaches based on the Lefschetz number. This framework eliminates several restrictive assumptions -- such as the need for definability, openness, or f-invariance of subspaces -- thereby allowing broader applicability. We also present a natural combinatorial adaptation of the fixed point index that extends the combinatorial Lefschetz number. This extension yields new top…

This https://arxiv.org/abs/2406.10189 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Topological rigidity of small RCD(K,N) spaces with maximal rank
For a polycyclic group $Λ$, $\text{rank} ( Λ)$ is defined as the number of $\mathbb{Z}$ factors in a polycyclic decomposition of $Λ$. For a finitely generated group $G$, $\text{rank} (G)$ is defined as the infimum of $ \text{rank} (Λ)$ among finite index polycyclic subgroups $Λ\leq G$. For a compact $\text{RCD} (K,N)$ space $(X,\mathsf{d}, \mathfrak{m})$ with $\text{diam} (X) \leq \varepsilon (K,N)$, the rank of $π_1(X)$ is at most $N$. We show that in case of equality, $X$ is homeomorphi…

Interesting piece on the #Arctic #SeaIce and it's (improving) representation in global climate models by Gavin Schmidt over on @realclimate, I'm not entirely sure all of the improvement is for the right reasons, there are probably compensating biases, it would be interesting to see if the models get the regional signal correct in different parts of the Arctic, but overall I agree with this piece, there have been some big steps forward in global models, the regional level is often not very well represented though.
https://www.realclimate.org/index.php/archives/2025/05/predicted-arctic-sea-ice-trends-over-time/

This https://arxiv.org/abs/1509.07195 has been replaced.
link: https://scholar.google.com/scholar?q=a

The Clifford algebra of a finite morphism
We develop a general theory of Clifford algebras for finite morphisms of schemes and describe applications to the theory of Ulrich bundles and connections to period-index problems for curves of genus 1.

The Fordham University
Tri-State Tick Risk Index for the week of June 27, is at the highest it can be:
a 10 out of 10.
What’s listed next to that score is the following:
"If you’re thinking of taking a hike, consider going to a movie instead."
h…

Fordham Tri-State Tick Risk
The Fordham Tick Index is an estimate of the risk of being bitten by a nymphal or adult deer tick.

Survey: local news outlets make up 51% of INN's 500 members, digital-first outlets employ ~3,200 journalists, foundation funding is 49% of revenue, and more (INN News)
https://news.inn.org/highlights-2025-inn-index/

Increase in local members and topical news coverage: Highlights from the 2025 INN Index survey - INN News
For the first time, local news outlets make up the largest segment of the Institute for Nonprofit News’ member network, according to the latest Index survey.

On some indices of foliations and applications
Arturo Fern\'andez-P\'erez, Evelia R. Garc\'ia Barroso, Nancy Saravia-Molina
https://arxiv.org/abs/2506.01090

On some indices of foliations and applications
In this paper we establish a relationship between the Milnor number, the $χ$-number, and the Tjurina number of a foliation with respect to an effective balanced divisor of separatrices. Moreover, using the Gómez-Mont--Seade--Verjovsky index, we prove that the difference between the multiplicity and the Tjurina number of a foliation with respect to a reduced curve is independent of the foliation. We also derive an adjunction formula for the Tjurina number of a foliation with respect to a reduc…

All You Need Is Binary Search! A Practical View on Lightweight Database Indexing on GPUs
Justus Henneberg, Felix Schuhknecht
https://arxiv.org/abs/2506.01576

All You Need Is Binary Search! A Practical View on Lightweight Database Indexing on GPUs
Performing binary search on a sorted dense array is a widely used baseline when benchmarking sophisticated index structures: It is simple, fast to build, and indexes the dataset with minimal memory footprint. However, the popular opinion is that it cannot compete with sophisticated indexes in terms of lookup performance, and hence, should not actually be considered in practice. Interestingly, in our recent works on (even more sophisticated) GPU-resident index structures, we observed the surpr…

This https://arxiv.org/abs/2505.23718 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCC_…

Fast Compressed-Domain N-Point Discrete Fourier Transform
This paper presents a novel algorithm for computing the N-point Discrete Fourier Transform (DFT) based solely on recursive Rectangular Index Compression (RIC) [1][2] and structured frequency shifts. The RIC DFT algorithm compresses a signal from $N=CL$ to $C\in[2,N/2]$ points at the expense of $N-1$ complex additions and no complex multiplication. It is shown that a $C$-point DFT on the compressed signal corresponds exactly to $C$ DFT coefficients of the original $N$-point DFT, namely, $X_{kL}$…

I have visited this small National Monument several times - it is very much worth a visit.
I fear that it, however, is near the top of FFOTUS' list of national monuments to dismantle.
Cesar Chavez National Monument
https://www.nps.gov/cech/index.htm

César E. Chávez National Monument (U.S. National Park Service)
Yes, we can!

Widely recognized as the most important Latino leader in the United States during the twentieth century, Cesar Chavez led farm workers and supporters in the establishment of the country's first permanent agricultural union. His leadership brought sustained international attention to the plight of U.S. farm workers, and secured for them higher wages and safer working conditions.

Query Drift Compensation: Enabling Compatibility in Continual Learning of Retrieval Embedding Models
Dipam Goswami, Liying Wang, Bart{\l}omiej Twardowski, Joost van de Weijer
https://arxiv.org/abs/2506.00037

Query Drift Compensation: Enabling Compatibility in Continual Learning of Retrieval Embedding Models
Text embedding models enable semantic search, powering several NLP applications like Retrieval Augmented Generation by efficient information retrieval (IR). However, text embedding models are commonly studied in scenarios where the training data is static, thus limiting its applications to dynamic scenarios where new training data emerges over time. IR methods generally encode a huge corpus of documents to low-dimensional embeddings and store them in a database index. During retrieval, a semant…

Defects Potentials for Two-Dimensional Topological Materials
Yuval Abulafia, Amit Goft, Nadav Orion, Eric Akkermans
https://arxiv.org/abs/2507.01530 https:…

Defects Potentials for Two-Dimensional Topological Materials
For non-topological quantum materials, introducing defects can significantly alter their properties by modifying symmetry and generating a nonzero analytical index, thus transforming the material into a topological one. We present a method to construct the potential matrix configuration with the purpose of obtaining a non-zero analytical index, akin to a topological invariant like a winding or Chern number. We establish systematic connections between these potentials, expressed in the continuum…

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems
Levi Lorenzo
https://arxiv.org/abs/2505.24135 https://a…

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems
We study index pairings for crossed-product $C^*$-algebras arising from minimal actions on the Cantor set. We utilize Putnam's orbit-breaking AF-subalgebras and embeddings to show we can compute any index pairing for Cantor minimal system crossed products using Connes' trace formulas. In the case of odometers, we show that the associated algebras have uniformly finitely summable $K$-homology.

I built a free tool to help students compare the energy/water use of AI tasks—like a 3-sec video gen or 500-word GPT reply—to everyday ones like Netflix, Google, or cloud storage. Try it at https://what-uses-more.com
Adjust variables like prompt complexity or the energy source and climate of local …

Modeling the Optical Properties of Biological Structures using Symbolic Regression
Julian Sierra-Velez, Alexandre Vial, Marina Inchaussandague, Diana Skigin, Demetrio Mac\'ias
https://arxiv.org/abs/2506.01862

Modeling the Optical Properties of Biological Structures using Symbolic Regression
We present a Machine Learning approach based on Symbolic Regression to derive, from either numerically generated or experimentally measured spectral data, closed-form expressions that model the optical properties of biological materials. To evaluate the performance of our approach, we consider three case studies with the aim of retrieving the refractive index of the materials that constitute the biological structures considered. The results obtained show that, in addition to retrieving readable…

Combinatorial Multi-Access Coded Caching with Private Caches under Intersecting Index Constraints
Dhruv Pratap Singh, Anjana A. Mahesh, B. Sundar Rajan
https://arxiv.org/abs/2506.24060

Combinatorial Multi-Access Coded Caching with Private Caches under Intersecting Index Constraints
We consider the coded caching system where each user, equipped with a private cache, accesses a distinct r-subset of access caches. A central server housing a library of files populates both private and access caches using uncoded placement. In this work, we focus on a constrained indexing regime, referred to as the intersection class, in which the sets used to index the demands of each user must have a nonempty intersection. This regime models resource-limited IoT scenarios such as edge-assist…

This https://arxiv.org/abs/2501.12905 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
We study the influence of hyperons in binary neutron star (NS) mergers considering a total of 14 temperature dependent equations of state (EoSs) models which include hyperonic degrees of freedom and partly delta resonances. Thermally produced hyperons induce a higher heat capacity and a lower thermal index, i.e. a reduced thermal pressure for a given amount of thermal energy, compared to purely nucleonic models. We run a large set of relativistic hydrodynamics simulations of NS mergers to explo…

I finally finished Houyhnhnm Computing, a wonderful exploration of an alternative approach to programming, and the advantages it would bring.
https://ngnghm.github.io/index.html
I’d highly recommend reading it. (At least, chapters 1–9 were great. Chapter 10 is about Urbit, which… ble…

Animals are abused and exploited in various ways for the sake of entertainment. LCA strongly opposes the use of animals in entertainment.
Animals have their own needs, interests, and rights, especially the right to engage in their natural behaviors in their natural habitat. https://www.lcanimal.org/…

Unifying Framework for Amplification Mechanisms: Criticality, Resonance and Non-Normality
Virgile Troude, Didier Sornette
https://arxiv.org/abs/2506.01996 …

Unifying Framework for Amplification Mechanisms: Criticality, Resonance and Non-Normality
We bring together three key amplification mechanisms in linear dynamical systems: spectral criticality, resonance, and non-normality. We disentangle and quantitatively couple these effects through two fundamental parameters: (i) the spectral distance to a conventional bifurcation or to a resonance and (ii) a non-normal index K (or condition number $κ$) that measures the obliqueness of the eigenvectors. Closed-form expressions for the system's response to both Gaussian noise and periodic forcin…

Two different takes on the potential of AI for cataloguing in 'Catalogue and Index'
'Augmenting cataloguers' https://journals.cilip.org.uk/catalogue-and-index/article/view/750
'Smart enough to mislead'

In a week when the Canadian federal government strongly condemned Israel withholding aid and called human suffering in Gaza "intolerable".
City councillor Shelley Caroll of Don Valley North decided that it was the right week to publicly show her support to.. Walk with Israel. She thinks Israel is the country to support and must walk to support)
(Also present, Mike Colle, Brad Bradford, Rachel Chernos Lin, James Pasternak)

When Servers Meet Species: A Fab-to-Grave Lens on Computing's Biodiversity Impact
Tianyao Shi, Ritbik Kumar, Inez Hua, Yi Ding
https://arxiv.org/abs/2506.20442

When Servers Meet Species: A Fab-to-Grave Lens on Computing's Biodiversity Impact
Biodiversity loss is a critical planetary boundary, yet its connection to computing remains largely unexamined. Prior sustainability efforts in computing have focused on carbon and water, overlooking biodiversity due to the lack of appropriate metrics and modeling frameworks. This paper presents the first end-to-end analysis of biodiversity impact from computing systems. We introduce two new metrics--Embodied Biodiversity Index (EBI) and Operational Biodiversity Index (OBI)--to quantify biodive…

It can be hard to keep up with crucial news at the University of Florida because of the minimal communication from the administration. To make it easier for folks to keep up I'm starting
@index@ufwatch.org to provide short summaries of key news items with links to the sources.
https://ufwatch.org/uf-watch-keep-up-with-crucial-news-about-the-university-of-florida/
If that's helpful to you can keep up using:
Mastodon/Fediverse: @index@ufwatch.org
BlueSky: @ufwatch.bsky.social
Newsletter/Website: ufwatch.org
RSS: ufwatch.org/rss

Sometimes {renv} just isnt enough to ensure your environment is controlled. Maybe {slushy} could be an option? https://gsk-biostatistics.github.io/slushy/index.html

This https://arxiv.org/abs/2411.16903 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Detecting eigenvalues in a fourth-order nonlinear Schrödinger equation with a non-regular Maslov box
We use the Maslov index to study the eigenvalue problem arising from the linearisation about solitons in the fourth-order cubic nonlinear Schrödinger equation (NLSE). Our analysis is motivated by recent work by Bandara et al., in which the fourth-order cubic NLSE was shown to support infinite families of multipulse solitons. Using a homotopy argument, we prove that the Morse indices of two selfadjoint fourth-order operators appearing in the linearisation may be computed by counting conjugate p…

An equation-based batch distillation simulation to evaluate the effect of multiplicities in thermodynamic activity coefficients
Jennifer Werner, Jochen Schmid, Lorenz T. Biegler, Michael Bortz
https://arxiv.org/abs/2506.21483

An equation-based batch distillation simulation to evaluate the effect of multiplicities in thermodynamic activity coefficients
In this paper, we investigate the influence of multiplicities in activity coefficients on batch distillation processes. In order to do so, we develop a rigorous simulation of batch distillation processes based on the MESH equations. In particular, we propose a novel index reduction method to transform the original index-$2$ system into a well-posed differential-algebraic system of index $1$. With the help of this simulation, we then explore whether the alternative NRTL parameters, which yield i…

On the hidden costs of passive investing
Iro Tasitsiomi
https://arxiv.org/abs/2506.21775 https://arxiv.org/pdf/2506.21775

On the hidden costs of passive investing
Passive investing has gained immense popularity due to its low fees and the perceived simplicity of focusing on zero tracking error, rather than security selection. However, our analysis shows that the passive (zero tracking error) approach of waiting until the market close on the day of index reconstitution to purchase a stock (that was announced days earlier as an upcoming addition) results in costs amounting to hundreds of basis points compared to strategies that involve gradually acquiring …

I don't know who uses #Citrix Netscalers any longer, but if you do, you've got some work to do to ensure that they are secure. The post describes the work you have to do -- in addition to applying the appropriate patches -- to address recent vulnerabilities. #cybersecurity

Checklist for NetScaler (Citrix ADC) CVE-2025-5777 – Deyda.net
Checklist for NetScaler (Citrix ADC) CVE-2025-5777 Deyda.net

Consumer price for mobility in 🇨🇭, 2000-2024
The report "Environment Switzerland 2018" (https://www.bafu.admin.ch/bafu/en/home/state/publications-on-the-state-of-the-environment/environment-switz…

Experimenting with Permutation Wordle
Aurora Hiveley
https://arxiv.org/abs/2506.23452 https://arxiv.org/pdf/2506.23452

Experimenting with Permutation Wordle
Consider a game of permutation wordle in which a player attempts to guess a secret permutation of length $n$ in as few guesses as possible. In each round, the guessing player is told which indices of their guessed permutation are correct. How can we optimize the player's strategy? Samuel Kutin and Lawren Smithline (arXiv:2408.00903) propose a strategy called "cyclic shift" in which all incorrect entries are shifted one index to the right in successive guesses, and they conjecture its optimality…

A tunnelled road underneath Ontario's Highway 401 would be an expensive and very short term solution to congestion. A high speed train subway would be cheaper, move many more people and cost less.
A better Toronto, for all.
A Real Solution to Highway 401 Congestion — the Express Subway.
A subway to Pickering makes much more sense than a 401 Tunnel.

Nonlinear PDEs with modulated dispersion IV: normal form approach and unconditional uniqueness
Massimiliano Gubinelli, Guopeng Li, Jiawei Li, Tadahiro Oh
https://arxiv.org/abs/2505.24270

Nonlinear PDEs with modulated dispersion IV: normal form approach and unconditional uniqueness
We study the modulated Korteweg-de~Vries equation (KdV) on the circle with a time non-homogeneous modulation acting on the linear dispersion term. By adapting the normal form approach to the modulated setting, we prove sharp unconditional uniqueness of solutions to the modulated KdV in $L^2(\mathbb T)$ if a modulation is sufficiently irregular. For example, this result implies that if the modulation is given by a sample path of a fractional Brownian motion with Hurst index $0 < H < \frac 25$, t…

Power-Linear Polar Directional Fields
Jiabao Brad Wang, Amir Vaxman
https://arxiv.org/abs/2506.00222 https://arxiv.org/pdf/2506.00222…

Power-Linear Polar Directional Fields
We introduce a novel method for directional-field design on meshes, enabling users to specify singularities at any location on a mesh. Our method uses a piecewise power-linear representation for phase and scale, offering precise control over field topology. The resulting fields are smooth and accommodate any singularity index and field symmetry. With this representation, we mitigate the artifacts caused by coarse or uneven meshes. We showcase our approach on meshes with diverse topologies and t…

Developing a Synthetic Socio-Economic Index through Autoencoders: Evidence from Florence's Suburban Areas
Giulio Grossi, Emilia Rocco
https://arxiv.org/abs/2506.23849

Developing a Synthetic Socio-Economic Index through Autoencoders: Evidence from Florence's Suburban Areas
The interest in summarizing complex and multidimensional phenomena often related to one or more specific sectors (social, economic, environmental, political, etc.) to make them easily understandable even to non-experts is far from waning. A widely adopted approach for this purpose is the use of composite indices, statistical measures that aggregate multiple indicators into a single comprehensive measure. In this paper, we present a novel methodology called AutoSynth, designed to condense potent…

Microsoft’s 2025 work trend index report found that many workers are increasingly grappling with “infinite workdays”,
which start before sunrise and stretch late into the night.
They are interrupted by some 270 pinging notifications along the way, about one every two minutes.
https://www.…

Breaking down the infinite workday
To unlock AI’s full potential, we need to clear one key barrier. A follow-up to the 2025 Work Trend Index.

A scalar-mean curvature comparison theorem for manifolds with iterated conical singularities
Milan Jovanovic, Jinmin Wang
https://arxiv.org/abs/2506.24059 …

A scalar-mean curvature comparison theorem for manifolds with iterated conical singularities
We use the Dirac operator method to prove a scalar-mean curvature comparison theorem for spin manifolds which carry iterated conical singularities. Our approach is to study the index theory of a twisted Dirac operator on such singular manifolds. A dichotomy argument is used to prove the comparison theorem without knowing precisely the index of the twisted Dirac operator. This framework also enables us to prove a rigidity theorem of Euclidean domains and a spin positive mass theorem for asymptot…

update:
🐛 fixed crash when attempting to index a very long word
prompted by the author posting a zalgo string larger than 20 kB, then trying to view her backup, and meow's in-browser full-text search indexer crashing as a result :pika:

Duckduckgo is fine for the time being, but that won't last long. MS wants to drive people to AI.
Maybe we need a foundation-run public search index. Something we can all build our own search front-ends on.
https://www.wired.com/story/bing-microsoft-api-su…

Microsoft Cuts Off Access to Bing Search Data as It Shifts Focus to Chatbots
Microsoft is limiting access to tools that boosted its rivals, but larger customers like DuckDuckGo say they won’t be affected.

The Federal Court of Justice ruled that German police may forcibly lay the suspect's finger onto their smartphone's fingerprint sensor to unlock it, if there's a search warrant intended to seize the phone and if the data access is proportionate.
Shut down your phone if police tell you to hand it out, I guess 🤷
@…

Hurricane Impact Index for Assessing Direct and Indirect Hazards in Central America
Manrique Camacho, Amanda Cede\~no, Luis A. Barboza, Shu Wei Chou-Chen, Mario J. G\'omez, Hugo G. Hidalgo
https://arxiv.org/abs/2506.19858

Hurricane Impact Index for Assessing Direct and Indirect Hazards in Central America
Hurricanes rank among the most destructive natural hazards. They are complex phenomena that can cause both direct damage along their path and indirect impacts due to heavy rainfall and strong winds, with effects varying according to regional topography. In this paper, we propose a Hurricane Impact Index to assess both direct and indirect hazards, and we demonstrate its applicability to the Central American region. The index is constructed so that we can decompose these effects across multiple d…

SSCard: Substring Cardinality Estimation using Suffix Tree-Guided Learned FM-Index
Yirui Zhan, Wen Nie, Jun Gao
https://arxiv.org/abs/2505.24312 https://…

SSCard: Substring Cardinality Estimation using Suffix Tree-Guided Learned FM-Index
Accurate cardinality estimation of substring queries, which are commonly expressed using the SQL LIKE predicate, is crucial for query optimization in database systems. While both rule-based methods and machine learning-based methods have been developed to optimize various aspects of cardinality estimation, their absence of error bounds may result in substantial estimation errors, leading to suboptimal execution plans. In this paper, we propose SSCard, a novel SubString Cardinality estimator tha…

This https://arxiv.org/abs/2407.10145 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Simplifying generic smooth maps to the 2-sphere and to the plane
We study how to construct explicit deformations of generic smooth maps from closed $n$--dimensional manifolds $M$ with $n \geq 2$ to the $2$--sphere $S^2$ and show that every smooth map $M \to S^2$ is homotopic to a $C^\infty$ stable map with at most one cusp point and with only folds of the middle absolute index. Furthermore, if $n$ is even, such a $C^\infty$ stable map can be so constructed that the restriction to the singular point set is a topological embedding. As a corollary, we show that…

Forecasting Labor Markets with LSTNet: A Multi-Scale Deep Learning Approach
Adam Nelson-Archer, Aleia Sen, Meena Al Hasani, Sofia Davila, Jessica Le, Omar Abbouchi
https://arxiv.org/abs/2507.01979

Forecasting Labor Markets with LSTNet: A Multi-Scale Deep Learning Approach
We present a deep learning approach for forecasting short-term employment changes and assessing long-term industry health using labor market data from the U.S. Bureau of Labor Statistics. Our system leverages a Long- and Short-Term Time-series Network (LSTNet) to process multivariate time series data, including employment levels, wages, turnover rates, and job openings. The model outputs both 7-day employment forecasts and an interpretable Industry Employment Health Index (IEHI). Our approach o…

NaviX: A Native Vector Index Design for Graph DBMSs With Robust Predicate-Agnostic Search Performance
Gaurav Sehgal, Semih Salihoglu
https://arxiv.org/abs/2506.23397

NaviX: A Native Vector Index Design for Graph DBMSs With Robust Predicate-Agnostic Search Performance
There is an increasing demand for extending existing DBMSs with vector indices so that they become unified systems capable of supporting modern predictive applications, which require joint querying of vector embeddings together with the structured properties and connections of objects. We present NaviX, a native vector index for graph DBMSs (GDBMSs) that has two main design goals. First, we aim to implement a disk-based vector index that leverages the core storage and query-processing capabilit…

If you're curious about how good progressive image loading can be:
Go to https://jxl-oxide.tirr.dev/demo/index.html, select the Weesen (HDR) image, and set it to having loaded about 0.40% or 2% (7kB or 36kB out of 1.8MB).
This should simplify thumbnails a lot.
…

So, my Valve Index arrived. As you may know, it officially supports Linux.
It works, sort of, but dear god what a mess that was to get working.
Within the span of one evening, I have seen it all: GPU freezing, failing to aquire a DRM lease, firmware updates crashing, latency, and some weird swap chain flickering issue.
It works, though. On Linux. And I have a plethora of paths to get it perfect. This weekend will be awesome.

A Budgeted Multi-Level Monte Carlo Method for Full Field Estimates of Multi-PDE Problems
Niklas Baumgarten, Robert Kutri, Robert Scheichl
https://arxiv.org/abs/2506.01644

A Budgeted Multi-Level Monte Carlo Method for Full Field Estimates of Multi-PDE Problems
We present a high-performance budgeted multi-level Monte Carlo method for estimates on the entire spatial domain of multi-PDE problems with random input data. The method is designed to operate optimally within memory and CPU-time constraints and eliminates the need for a priori knowledge of the problem's regularity and the algorithm's potential memory demand. To achieve this, we build on the budgeted multi-level Monte Carlo framework and enhance it with a sparse multi-index update algorithm ope…

Spotted this tiny praying mantis peeping in our window. I think just under 2 centimeters long. I tried to get my index finger in for scale.
#prayingmantis #Insects #WildLife

I should learn to do a floating IP, but it sounds complicated! https://docs.oracle.com/en/learn/oci-ip-failover/index.html#task-2-configure-the-cluster-and-the-floating-ip

Negative Refraction Makes a Perfect Lens
JB Pendry
https://arxiv.org/abs/2507.01682 https://arxiv.org/pdf/2507.01682

Negative Refraction Makes a Perfect Lens
With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those that do not propagate in a radiative manner. Such super lenses can be realised in the microwave band with current technology and a version operating at the frequency of visible light, but at short distances of a few nanometres, can be realised in…

Gender Differences in International Research Collaboration in European Union
Elsa Fontainha, Tanya Ara\'ujo
https://arxiv.org/abs/2507.00619 https://…

Gender Differences in International Research Collaboration in European Union
This paper investigates International Research Collaboration (IRC) among European Union (EU) countries from 2011 to 2022, with emphasis on gender-based authorship patterns. Drawing from the Web of Science Social Science Citation Index (WoS-SSCI) database, a large dataset of IRC articles was constructed, annotated with categories of authorship based on gender, author affiliation, and COVID-19 subject as topic. Using network science, the study maps collaboration structures and reveals gendered di…

Decentralized Pliable Index Coding For Federated Learning In Intelligent Transportation Systems
Sadina Kadakkottiri, Narisetty Harish, Nujoom Sageer Karat, Deepthi Paramel Pattathil, Balaji Sundar Rajan
https://arxiv.org/abs/2507.00643

Decentralized Pliable Index Coding For Federated Learning In Intelligent Transportation Systems
Federated Learning is a promising option for data privacy and security in ITS, because it allows edge devices, Road Side Units (RSUs), and Central Server (CS) to jointly train the machine learning model. Since RSU collects data from the vehicles passing through its range, the local data of each RSU will have a non-IID distribution, which adversely affects the convergence speed and accuracy of FL training. Generating synthetic data locally at individual nodes, followed by data shuffling among th…

Stochastic Price Dynamics in Response to Order Flow Imbalance: Evidence from CSI 300 Index Futures
Chen Hu, Kouxiao Zhang
https://arxiv.org/abs/2505.17388 …

Stochastic Price Dynamics in Response to Order Flow Imbalance: Evidence from CSI 300 Index Futures
We conduct modeling of the price dynamics following order flow imbalance in market microstructure and apply the model to the analysis of Chinese CSI 300 Index Futures. There are three findings. The first is that the order flow imbalance is analogous to a shock to the market. Unlike the common practice of using Hawkes processes, we model the impact of order flow imbalance as an Ornstein-Uhlenbeck process with memory and mean-reverting characteristics driven by a jump-type Lévy process. Motivate…

The Debugging Decay Index: Rethinking Debugging Strategies for Code LLMs
Muntasir Adnan, Carlos C. N. Kuhn
https://arxiv.org/abs/2506.18403 https://…

The Debugging Decay Index: Rethinking Debugging Strategies for Code LLMs
The effectiveness of AI debugging follows a predictable exponential decay pattern; most models lose 60-80% of their debugging capability within just 2-3 attempts, despite iterative debugging being a critical capability for practical code generation systems. We introduce the Debugging Decay Index (DDI), a mathematical framework that quantifies when debugging becomes ineffective and predicts intervention points. Our strategic fresh start approach shifts from exploitation to exploration at strateg…

Anomalous refractive index modulation and giant birefringence in 2D ferrielectric CuInP$_2$S$_6$
Houssam El Mrabet Haje, Roald J. H. van der Kolk, Trent M. Kyrk, Mazhar N. Ali
https://arxiv.org/abs/2506.21279

Anomalous refractive index modulation and giant birefringence in 2D ferrielectric CuInP$_2$S$_6$
2D ferroelectric (FE) materials have opened new opportunities in non-volatile memories, computation and non-linear optics due to their robust polarization in the ultra-thin limit and inherent flexibility in device integration. Recently, interest has grown in the use of 2D FEs in electro-optics, demanding the exploration of their electronic and optical properties. In this work, we report the discovery of an unprecedented anomalous thickness-dependent change in refractive index, as large as $δn$…

“Obama’s Prophetic Voice Has Never Been More Needed
Dare we hope for audacity?
As various leaders call for resistance against Trump’s march to dictatorship, one prophetic voice has been missing in action. Barack Obama, before he was president, was a professor of constitutional law. He understands the stakes better than anyone. He also knows how to give a powerful and inspiring speech….”
https://americanprospect.bluelena.io/index.php

Adaptive tail index estimation: minimal assumptions and non-asymptotic guarantees
Johannes Lederer, Anne Sabourin, Mahsa Taheri
https://arxiv.org/abs/2505.22371

Adaptive tail index estimation: minimal assumptions and non-asymptotic guarantees
A notoriously difficult challenge in extreme value theory is the choice of the number $k\ll n$, where $n$ is the total sample size, of extreme data points to consider for inference of tail quantities. Existing theoretical guarantees for adaptive methods typically require second-order assumptions or von Mises assumptions that are difficult to verify and often come with tuning parameters that are challenging to calibrate. This paper revisits the problem of adaptive selection of $k$ for the Hill…

The relative index in coarse index theory and submanifold obstructions to uniform positive scalar curvature
Alexander Engel, Christopher Wulff
https://arxiv.org/abs/2506.14301

The relative index in coarse index theory and submanifold obstructions to uniform positive scalar curvature
We provide a coarse version of the relative index of Gromov and Lawson and thoroughly establish all of its basic properties. As an application, we discuss a general procedure to construct wrong way maps on the $K$-theory of the Roe algebra mapping the coarse index class of the Dirac operator of a manifold to the one of a suitably embedded submanifold of arbitrary codimension, thereby establishing an abstract machinery to find obstructions to uniform positive scalar curvature coming from these s…

Computing matrix $\varphi$-functions arising in exponential integrators
Awad H. Al-Mohy, Xiaobo Liu
https://arxiv.org/abs/2506.01193 https://

Computing matrix $φ$-functions arising in exponential integrators
A new scaling and recovering algorithm is proposed for simultaneously computing the matrix $φ$-functions that arise in exponential integrator methods for the numerical solution of certain first-order systems of ordinary differential equations (ODEs). The algorithm initially scales the input matrix down by a nonnegative integer power of two, then computes the $[m/m]$ diagonal Padé approximant to $φ_p$, where $p$ is the largest index of interest. The remaining $[m+p{-}j/m]$ Padé approximants …

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Takumi Koike, Yusuke Ito, Naohiko Sugita
https://arxiv.org/abs/2506.22582

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Ultrashort pulse lasers (USPLs) have attracted attention as tools capable of inducing unique phenomena by instantaneously generating regions with transiently modified properties (filaments) in the material. However, a comprehensive understanding of USPL-induced filaments remains elusive due to the complexity of their dynamics and insufficient imaging techniques to accurately capture them. In this study, we propose a novel methodology to measure the transient complex refractive index of filament…

Scale-Dependent Multifractality in Bitcoin Realised Volatility: Implications for Rough Volatility Modelling
Milan Pontiggia (MAGEFI - University of Bordeaux, France)
https://arxiv.org/abs/2507.00575

Scale-Dependent Multifractality in Bitcoin Realised Volatility: Implications for Rough Volatility Modelling
We assess the applicability of rough volatility models to Bitcoin realised volatility using the normalised p-variation framework of Cont and Das (2024). Applying this model free estimator to high-frequency Bitcoin data from 2017 to 2024 across multiple sampling resolutions, we find that the normalised statistic remains strictly negative throughout, precluding the estimation of a valid roughness index. Stationarity tests and robustness checks reveal no significant evidence of non-stationarity or…

Higher order spectral shift of Euclidean Callias operators
Oliver F\"urst
https://arxiv.org/abs/2506.01647 https://arxiv.org/pdf…

Higher order spectral shift of Euclidean Callias operators
We consider Dirac-Schrödinger operators over odd-dimensional Euclidean space. The conditions for the potential are based on those of C. Callias in his famous paper on the corresponding index problem. However, we treat the case where the potential can take values in unbounded operators of a separable Hilbert space, and crucially, we also do not assume that the potential needs to be invertible outside a compact region. Hence, the Dirac-Schrödinger operator is not necessarily Fredholm. In the se…

Academic Research Output Derivatives: Structuring Futures and Options on Research Output Index
Amarendra Sharma
https://arxiv.org/abs/2505.20492 https://…

Academic Research Output Derivatives: Structuring Futures and Options on Research Output Index
This paper explores an innovative financial concept--Academic Research Output Futures (AROFs)--which aim to bring the tools of market-based finance into the realm of academic research. At the heart of this idea lies a cash-settled futures contract tethered to a composite Research Output Index (ROI), a metric designed to quantify the research productivity of universities and research institutions. By allowing investors to take positions--speculative or hedging--on the projected trajectory of aca…

From David Suzuki
It’s hard not to conclude that much of the world has been taken over by idiots. Sure, there have always been uninformed politicians & those who let their ideology stumble ahead of their wits. & some who seem more sociopathic than stupid, waging brutal wars & massacres with no regard for the lives, families and communities they destroy under whatever nationalistic banner they concoct to justify their actions.
Lately things seem extraordinarily stupid.…

This https://arxiv.org/abs/2505.21924 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Modified Transfer Matrix Method for the Extraction of Material Properties via Terahertz Time-Domain Spectroscopy
Terahertz Time-Domain Spectroscopy is a powerful technique for extracting the low-frequency optical properties of materials. However, the optical constants are difficult to determine directly from the experimental transfer function, such that various numerical approximations must be implemented to describe specific conditions. Here, we introduce a modified Transfer Matrix Method that uses a genetic algorithm for optimization to determine the refractive index of materials in the THz regime. We s…

Single-Index Quantile Factor Model with Observed Characteristics
Ruofan Xu, Qingliang Fan
https://arxiv.org/abs/2506.19586 https://ar…

Single-Index Quantile Factor Model with Observed Characteristics
We propose a characteristics-augmented quantile factor (QCF) model, where unknown factor loading functions are linked to a large set of observed individual-level (e.g., bond- or stock-specific) covariates via a single-index projection. The single-index specification offers a parsimonious, interpretable, and statistically efficient way to nonparametrically characterize the time-varying loadings, while avoiding the curse of dimensionality in flexible nonparametric models. Using a three-step sieve…

Fast Compressed-Domain N-Point Discrete Fourier Transform
Saulo Queiroz
https://arxiv.org/abs/2505.23718 https://arxiv.org/pdf/2505.2…

Fast Compressed-Domain N-Point Discrete Fourier Transform
This paper presents a novel algorithm for computing the N-point Discrete Fourier Transform (DFT) based solely on recursive Rectangular Index Compression (RIC) [1][2] and structured frequency shifts. The RIC DFT algorithm compresses a signal from $N=CL$ to $C\in[2,N/2]$ points at the expense of $N-1$ complex additions and no complex multiplication. It is shown that a $C$-point DFT on the compressed signal corresponds exactly to $C$ DFT coefficients of the original $N$-point DFT, namely, $X_{kL}$…

Robustness of real-space topology in moir\'e systems
Kry\v{s}tof Kol\'a\v{r}, Kang Yang, Felix von Oppen, Christophe Mora
https://arxiv.org/abs/2507.00130

Robustness of real-space topology in moiré systems
The appearance of fractional Chern insulators in moiré systems can be rationalized by the presence of a fictitious magnetic field associated with the spatial texture of layer-resolved electronic wavefunctions. Here, we present a systematic study of real-space topology and the associated fictitious magnetic fields in moiré systems. We first show that at the level of individual Bloch wavefunctions, the real-space Chern number, akin to a Pontryagin index, is a fragile marker. It generically vani…

This https://arxiv.org/abs/2503.23776 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csDB_…

VIDEX: A Disaggregated and Extensible Virtual Index for the Cloud and AI Era
Virtual index, also known as hypothetical indexes, play a crucial role in database query optimization. However, with the rapid advancement of cloud computing and AI-driven models for database optimization, traditional virtual index approaches face significant challenges. Cloud-native environments often prohibit direct conducting query optimization process on production databases due to stability requirements and data privacy concerns. Moreover, while AI models show promising progress, their int…

Clustering Tails in High Dimension
Liujun Chen, Marco Oesting, Chen Zhou
https://arxiv.org/abs/2506.19414 https://arxiv.org/pdf/2506.…

Clustering Tails in High Dimension
One potential solution to combat the scarcity of tail observations in extreme value analysis is to integrate information from multiple datasets sharing similar tail properties, for instance, a common extreme value index. In other words, for a multivariate dataset, we intend to group dimensions into clusters first, before applying any pooling techniques. This paper addresses the clustering problem for a high dimensional dataset, according to their extreme value indices. We propose an iterative…

Low-dispersion low free-spectral-range Mach-Zehnder interferometer with long straight path lengths on silicon
Cael Warner
https://arxiv.org/abs/2507.01114 …

Low-dispersion low free-spectral-range Mach-Zehnder interferometer with long straight path lengths on silicon
Multiple Mach-Zehnder interferometers are constructed using fiber-Bragg grating couplers, y-branches, silicon waveguides, and/or broadband splitters in silicon on insulator strip waveguides to test the effect of variation in waveguide length between consecutive bends on the transmission gain spectrum, free-spectral range, group refractive index, and dispersion. Dispersion is mitigated by increasing the path length between consecutive bends of minimum radius. With long linear waveguide sections,…

Piecewise Linear Approximation in Learned Index Structures: Theoretical and Empirical Analysis
Jiayong Qin, Xianyu Zhu, Qiyu Liu, Guangyi Zhang, Zhigang Cai, Jianwei Liao, Sha Hu, Jingshu Peng, Yingxia Shao, Lei Chen
https://arxiv.org/abs/2506.20139

Piecewise Linear Approximation in Learned Index Structures: Theoretical and Empirical Analysis
A growing trend in the database and system communities is to augment conventional index structures, such as B+-trees, with machine learning (ML) models. Among these, error-bounded Piecewise Linear Approximation ($ε$-PLA) has emerged as a popular choice due to its simplicity and effectiveness. Despite its central role in many learned indexes, the design and analysis of $ε$-PLA fitting algorithms remain underexplored. In this paper, we revisit $ε$-PLA from both theoretical and empirical perspe…

This https://arxiv.org/abs/2505.05128 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Constraints Preserving Lax-Wendroff Flux Reconstruction for Relativistic Hydrodynamics with General Equations of State
In the realm of relativistic astrophysics, the ideal equation of state with a constant adiabatic index provides a poor approximation due to its inconsistency with relativistic kinetic theory. However, it is a common practice to use it for relativistic fluid flow equations due to its simplicity. Here we develop a high-order Lax-Wendroff flux reconstruction method on Cartesian grids for solving special relativistic hydrodynamics equations with several general equations of state available in the l…

Record-high-Q AMTIR-1 microresonators for mid- to long-wave infrared nonlinear photonics
Liu Yang, Ryo Sugano, Ryomei Takabayashi, Hajime Kumazaki, Yongyong Zhuang, Xiaoyong Wei, Takasumi Tanabe, Shun Fujii
https://arxiv.org/abs/2505.23362

Record-high-Q AMTIR-1 microresonators for mid- to long-wave infrared nonlinear photonics
AMTIR-1 chalcogenide glass has shown its potential for use in thermal imaging systems owing to its low refractive index, thermal resistance and high transparency across the infrared wavelength regime. Here we report a millimeter-scale high-Q whispering gallery mode microresonator made of AMTIR-1. The recorded Q-factor has reached $1.2\times10^7$ at 1550~nm, which is almost two-orders of magnitude higher than previously reported values. We characterize the thermal properties, where low thermal c…