REG-CCSD(T):一种新的高效CCSD(T) 方法,通过规范化的焦点和中间激发矩阵来加速
1Fundamental Science Center of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China.
Journal of computational chemistry
|January 24, 2026
概括
一种新的REG-CCSD (T) 方法通过调整矩阵来提高计算化学效率. 这种准确且具有成本效益的方法加速了分子的量子化学计算.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 用单,双和扰动三次激发 (CCSD(T)) 方法的合集群是高精度量子化学的基准.
- 规范CCSD (T) 计算可能在计算上昂贵,这限制了它们对更大的系统的应用.
- 矩阵可逆性和正确性问题可能会在相关计算中出现,阻碍了趋同.
研究的目的:
- 开发一种基于CCSD (T) 形式主义的新,高效,准确的量子化学方法.
- 通过矩阵规范化解决传统CCSD计算中的计算瓶.
- 引入新方法的变体,包括密度拟合和冷核心近似.
主要方法:
- 用单,双和扰动三次激发 (REG-CCSD(T)) 方法开发规范化的合集群.
- 应用一个规范化参数来稳定CCSD (((T)) 框架内的矩阵操作.
- 扩展REG-CCSD(T) 以包括密度拟合 (REGDF-CCSD(T)) 和冷核心 (REGFC-CCSD(T)) 的近似值,以及它们的组合 (REGDF-FC-CCSD(T)).
主要成果:
- 在REG-CCSD (T) 方法实现高精度,与正规的CCSD (T) 方法相比,平均绝对偏差为4.06 × 10−4 kcal/mol.
- REG-CCSD (((T) 和它的变体显示出相对于正规CCSD (((T) 的显著加快速度,其中REGFC-CCSD (((T) 是最快的.
- 开发的方法提供了计算精度和效率之间的平衡,使高级量子化学更容易获得.
结论:
- 在不牺牲准确性的情况下,REG-CCSD (T) 方法为正规的CCSD (T) 提供了一个计算效率高的替代方案.
- 这些变体 (REGDF-CCSD(T,REGFC-CCSD(T,REGDF-FC-CCSD(T)) 进一步提高了针对特定计算需求的性能.
- 这种新方法使高精度的量子化学计算能够降低计算成本,有利于各种分子研究.
相关概念视频
Disassembly of Intermediate Filaments
2.6K
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.6K
Types of Intermediate Filaments
4.8K
The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
4.8K
Formation of Intermediate Filaments
3.9K
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
3.9K
Accelerators
278
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
The effectiveness of calcium chloride can...
278
The Structure of Intermediate Filaments
5.6K
The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm). These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate...
Intermediate...
5.6K
The Extracellular Matrix
88.4K
Overview
88.4K


