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@arXiv_physicschemph_bot@mastoxiv.page
2025-08-01 09:00:01

Graph-based block-diagonalization of full configuration interaction Hamiltonian: H$_2$ chains study
Hayun Park, Hunpyo Lee
arxiv.org/abs/2507.23593

Graph-based block-diagonalization of full configuration interaction Hamiltonian: H$_2$ chains study
We developed a graph-based block-diagonalization (GBBD) method for the full configuration interaction Hamiltonian of molecular systems to efficiently calculate the exact eigenvalues of low-energy states. In this approach, the non-zero matrix elements of the Hamiltonian are represented as edges on a graph, which naturally decomposes into disconnected clusters. Each cluster corresponds to an independent block in the block-diagonalized form of the Hamiltonian. The eigenvalues in the low-energy sec…

@leftsidestory@mstdn.social
2025-06-24 00:39:08

Park Discovery III 🏞️
公园探险 III 🏞️
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

**English:** This black and white photograph captures a close-up view of a carousel horse. The horse is intricately designed with detailed saddle and bridle decorations. The background shows other carousel animals and ornate details of the carousel structure, including mirrors and decorative panels. The image evokes a sense of nostalgia and the timeless charm of a classic amusement park ride. **Chinese:** 这张黑白照片近距离拍摄了一匹旋转木马上的马。这匹马设计精美，马鞍和马具装饰细节丰富。背景展示了其他旋转木马动物和旋转木马结构的装饰细节，包括镜子和装饰面板。这幅图片唤起了一种怀旧…
**English:** This black and white image depicts a section of a vintage carousel. The carousel is adorned with elaborate decorations, including ornate carvings and mirrors. Horses and other animals are visible, each intricately designed and painted. The structure of the carousel includes a railing and a central pole, adding to the classic aesthetic of this amusement ride. **Chinese:** 这张黑白图片展示了一个复古旋转木马的一部分。旋转木马装饰有精美的雕刻和镜子。可以看到马和其他动物，每个都设计精美并绘有图案。旋转木马的结构包括栏杆和中央柱，增添了这种娱乐设施的经典美感。
**English:** This black and white image showcases a grand architectural structure adorned with classical elements. The building features a series of ornate arches supported by intricately designed columns. Balconies with wrought iron railings overlook the scene, and the structure is embellished with decorative moldings and carvings. People can be seen standing under the arches, providing a sense of scale to the imposing architecture. **Chinese:** 这张黑白图片展示了一座装饰有古典元素的宏伟建筑结构。该建筑具有精心设计的柱子支撑的一系列装饰性…
**English:** This black and white photograph depicts the exterior of a modern building with a minimalist architectural design. The building features a flat roof and a series of evenly spaced vertical columns that create a rhythmic pattern of light and shadow. The facade includes several narrow windows, and there is a small set of stairs leading up to a door on the left side. The shadows of trees are cast onto the building, adding a natural element to the otherwise geometric scene. **Chinese:**…

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@wfryer@mastodon.cloud
2025-05-27 18:20:20

“America’s Pivot to the Pacific” by #AngryPlanet [PODCAST]
pca.st/episode/535d72f1-3347-4

The image features a colorful illustration with the title "Angry Planet: Pivot to the Pacific." It includes cartoon-style representations of various elements: a person wearing headphones, military soldiers engaged in exercises, boats on water, and a depiction of the "Nine

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@arXiv_mathAT_bot@mastoxiv.page
2025-06-26 07:58:10

On periodic families in the stable stems of height two
Christian Carrick, Jack Morgan Davies
arxiv.org/abs/2506.20507

On periodic families in the stable stems of height two
We discover 110 infinite periodic families in the 2-primary stable homotopy groups of spheres. These families appear in seventeen different congruence classes of degrees modulo 192, four of them consist of simple 4-torsion elements, and another two of simple 8-torsion. They all vanish in the homotopy groups of the spectrum TMF of topological modular forms, but we show that they are detected in the fixed-points of TMF with respect to an Atkin--Lehner involution.

@arXiv_condmatmeshall_bot@mastoxiv.page
2025-05-30 10:10:11

This arxiv.org/abs/2409.02236 has been replaced.
initial toot: mastoxiv.page/@a…

Umklapp-driven first-order transition into a charge-density wave phase
Using phenomenological Landau free energy, we systematically analyze influence of so-called umklapp contributions on the phase diagram of a solid hosting a commensurate charge-density wave phase. The umklapp terms may change the transition into the ordered state from continuous (second-order) to discontinuous (first-order). Additional elements, such as critical and tricritical points, emerge on the phase diagram under suitable conditions. The proposed mechanism is generalized for the case of ne…

@arXiv_csDB_bot@mastoxiv.page
2025-07-28 07:33:40

ApproxJoin: Approximate Matching for Efficient Verification in Fuzzy Set Similarity Join
Michael Mandulak, S M Ferdous, Sayan Ghosh, Mahantesh Halappanavar, George Slota
arxiv.org/abs/2507.18891

ApproxJoin: Approximate Matching for Efficient Verification in Fuzzy Set Similarity Join
The set similarity join problem is a fundamental problem in data processing and discovery, relying on exact similarity measures between sets. In the presence of alterations, such as misspellings on string data, the fuzzy set similarity join problem instead approximately matches pairs of elements based on the maximum weighted matching of the bipartite graph representation of sets. State-of-the-art methods within this domain improve performance through efficient filtering methods within the filte…

@arXiv_csCE_bot@mastoxiv.page
2025-07-31 07:31:01

An entropy-stable and kinetic energy-preserving macro-element HDG method for compressible flows
Vahid Badrkhani, Marco F. P. ten Eikelder, Dominik Schillinger
arxiv.org/abs/2507.22195

An entropy-stable and kinetic energy-preserving macro-element HDG method for compressible flows
This paper introduces a high order numerical framework for efficient and robust simulation of compressible flows. To address the inefficiencies of standard hybridized discontinuous Galerkin (HDG) methods in large scale settings, we develop a macro element HDG method that reduces global and local degrees of freedom by embedding continuous Galerkin structure within macro-elements. This formulation supports matrix free implementations and enables highly parallel local solves, leading to substantia…

@arXiv_grqc_bot@mastoxiv.page
2025-07-21 08:37:30

Direct Measurement of the Accretion Disk Formed in Prompt Collapse Mergers with Future Gravitational-Wave Observatories
Arnab Dhani, Alessandro Camilletti, Alessio Ludovico De Santis, Andrea Cozzumbo, David Radice, Domenico Logoteta, Albino Perego, Jan Harms, Marica Branchesi
arxiv.org/abs/2507.14071

Direct Measurement of the Accretion Disk Formed in Prompt Collapse Mergers with Future Gravitational-Wave Observatories
The production site of heavy r-process elements, such as Gold and Uranium, is uncertain. Neutron star mergers are the only astrophysical phenomenon in which we have witnessed their formation. However, the amount of heavy elements resulting from the merger remains poorly constrained, mainly due to uncertainties on the mass and angular momentum of the disk formed in the merger remnant. Matter accretion from the disk is also thought to power gamma ray-bursts. We discover from numerical relativity …

@leftsidestory@mstdn.social
2025-05-15 00:30:03

Urban Discoveries III 🏙️
都市发现 III 🏙️
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

**English Alt Text:** "A black and white photograph featuring a solitary tree with sparse branches against a clear sky. The tree stands in front of a building with a sign that reads 'URBAN REVIVO.' The scene is calm and serene, with the tree being the focal point." **Chinese Alt Text:** "一张黑白照片，展示了一棵孤独的树，树枝稀疏，背景是一片清朗的天空。这棵树位于一栋写有'URBAN REVIVO'标志的建筑前。场景宁静而祥和，树是焦点所在。"
**English Alt Text:** "A black and white photograph showing a close-up view of a complex, geometric, and abstract pattern. The pattern consists of intersecting lines and shapes, creating a web-like structure. In the center, there is a vertical rectangular object that stands out against the intricate background." **Chinese Alt Text:** "一张黑白照片，展示了一个复杂的几何抽象图案的特写视图。该图案由相交的线条和形状组成，形成一个网状结构。在中心位置，有一个垂直的矩形物体，在错综复杂的背景中显得格外突出。"
**English Alt Text:** "A black and white photograph showing a person viewed through a decorative metal fence. The person is wearing a jacket with Chinese characters on the back. The fence has a geometric pattern, and the background includes some greenery and a building." **Chinese Alt Text:** "一张黑白照片，通过一个装饰性的金属栅栏可以看到一个人。这个人穿着一件背后有中文字的夹克。栅栏具有几何图案，背景中有一些绿色植物和一栋建筑。"
**English Alt Text:** "A black and white photograph depicting a construction site. Several workers wearing helmets are seen on a raised platform or scaffolding, working on a large structure. The structure appears to be part of a building under construction, with visible beams and structural elements." **Chinese Alt Text:** "一张黑白照片，描绘了一个建筑工地。几名戴着安全帽的工人站在一个升高的平台或脚手架上，正在施工一个大型结构。该结构看起来是一栋在建建筑的一部分，可见梁和结构元素。"

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@leftsidestory@mstdn.social
2025-05-15 00:30:03

Urban Discoveries III 🏙️
都市发现 III 🏙️
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

**English Alt Text:** "A black and white photograph featuring a solitary tree with sparse branches against a clear sky. The tree stands in front of a building with a sign that reads 'URBAN REVIVO.' The scene is calm and serene, with the tree being the focal point." **Chinese Alt Text:** "一张黑白照片，展示了一棵孤独的树，树枝稀疏，背景是一片清朗的天空。这棵树位于一栋写有'URBAN REVIVO'标志的建筑前。场景宁静而祥和，树是焦点所在。"
**English Alt Text:** "A black and white photograph showing a close-up view of a complex, geometric, and abstract pattern. The pattern consists of intersecting lines and shapes, creating a web-like structure. In the center, there is a vertical rectangular object that stands out against the intricate background." **Chinese Alt Text:** "一张黑白照片，展示了一个复杂的几何抽象图案的特写视图。该图案由相交的线条和形状组成，形成一个网状结构。在中心位置，有一个垂直的矩形物体，在错综复杂的背景中显得格外突出。"
**English Alt Text:** "A black and white photograph showing a person viewed through a decorative metal fence. The person is wearing a jacket with Chinese characters on the back. The fence has a geometric pattern, and the background includes some greenery and a building." **Chinese Alt Text:** "一张黑白照片，通过一个装饰性的金属栅栏可以看到一个人。这个人穿着一件背后有中文字的夹克。栅栏具有几何图案，背景中有一些绿色植物和一栋建筑。"
**English Alt Text:** "A black and white photograph depicting a construction site. Several workers wearing helmets are seen on a raised platform or scaffolding, working on a large structure. The structure appears to be part of a building under construction, with visible beams and structural elements." **Chinese Alt Text:** "一张黑白照片，描绘了一个建筑工地。几名戴着安全帽的工人站在一个升高的平台或脚手架上，正在施工一个大型结构。该结构看起来是一栋在建建筑的一部分，可见梁和结构元素。"

Yiding Cao Geld mit PayPal.Me senden
Folgen Sie dem Link PayPal.Me/dingsterdingster und geben Sie den Betrag ein. Es ist bequem und sicher. Sie haben noch kein PayPal-Konto? Kein Problem.