检索结果-南通市图书馆

A parallel ant colonies approach to de novo prediction of protein backbone in CASP8/9

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第10期56卷 226-238页

作者： LV Qiang wu HongJie wu JinZhen HUANG Xu LUO XiaoHu QIAN Peide School of Computer Science and Technology Soochow University Jiangsu Provincial Key Lab for Information Processing Technologies School of Electronic and Information Engineering Suzhou University of Science and Technology

Predicting the three-dimensional structure of proteins from amino acid sequences with only a few remote homologs,or de novo prediction,remains a major challenge in computational *** modeling of the protein backbone represents the initial phase of a protein structure prediction *** a parallel ant colony optimization based on sharing one pheromone matrix,this report proposes a parallel approach to predict the structure of a protein *** parallel approach combines various sources of energy functions and generates protein backbones with the lowest energies jointly determined by the various energy *** free modeling targets in CASP8/9 are used to evaluate the performance of the *** 13 targets in CASP8,two out of the predicted model1s selected by our approach are the best of the published CASP8 results,and seven out of the model1s are ranked in the top *** 29 targets in CASP9,20 out of the best models from our predictions are ranked in the top 10,and 11 out of the model1s are ranked in the top 10.

关键词： protein backbone prediction parallel ant colony optimization

A Representation of the Lorentz Spin Group and Its Application

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第4期23卷 577-598页

作者： Qi Keng LU Ke wu Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 P. R. China School of Mathematical Science Capital Normal University Beijing 100037 P. R. China

For an integer m ≥ 4, we define a set of 2[m/2] × 2[m/2] matrices γj （m）, （j = 0, 1,..., m - 1） which satisfy γj （m）γk （m）＋γk （m）γj （m） = 2ηjk （m）I[m/2], where （ηjk （m）） 0≤j,k≤m-1 is a d... 详细信息

For an integer m ≥ 4, we define a set of 2[m/2] × 2[m/2] matrices γj （m）, （j = 0, 1,..., m - 1） which satisfy γj （m）γk （m）＋γk （m）γj （m） = 2ηjk （m）I[m/2], where （ηjk （m）） 0≤j,k≤m-1 is a diagonal matrix, the first diagonal element of which is 1 and the others are -1, I[m/2] is a 2[m/1] × 2[m/2] identity matrix with [m/2] being the integer part of m/2. For m = 4 and 5, the representation （m） of the Lorentz Spin group is known. For m≥ 6, we prove that （i） when m = 2n, （n ≥ 3）, （m） is the group generated by the set of matrices {T｜T=1/√ξ（（I＋k） 0 ＋ 0 I-K）（ U 0 0 U）, （ii） when m = 2n ＋ 1 （n≥ 3）, （m） is generated by the set of matrices {T｜T=1/√ξ（I -k^- k I）U,U∈ （m-1）,ξ=1-m-2 ∑k,j=0 ηkja^k a^j〉0, K=i[m-3 ∑j=0 a^j γj（m-2）＋a^（m-2） In],K^-=i[m-3∑j=0 a^j γj（m-2）-a^（m-2） In]}

关键词： Lorentz spin group representation Yang-Mills equation

Accreting CO material onto ONe white dwarfs towards accretion-induced collapse

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第3期18卷 121-128页

作者： Cheng-Yuan wu Bo Wang Yunnan Observatories Chinese Academy of Sciences Kunming 650216 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650216 China University of Chinese Academy of Sciences Beijing 100049 China Center for Astronomical Mega-Science Chinese Academy of Sciences Beijing 100012 China

The final outcomes of accreting ONe white dwarfs（ONe WDs） have been studied for several decades,but there are still some issues that are not resolved. Recently,some studies suggested that the deflagration of oxygen would occur for accreting ONe WDs with Chandrasekhar masses. In this paper,we aim to investigate whether ONe WDs can experience accretion-induced collapse（AIC） or explosions when their masses approach the Chandrasekhar limit. Employing the stellar evolution code Modules for Experiments in Stellar Astrophysics（MESA）,we simulate the longterm evolution of ONe WDs with accreting CO material. The ONe WDs undergo weak multicycle carbon flashes during the mass-accretion process,leading to mass increase of the WDs. We found that different initial WD masses and mass-accretion rates influence the evolution of central density and temperature. However,the central temperature cannot reach the explosive oxygen ignition temperature due to neutrino cooling. This work implies that the final outcome of accreting ONe WDs is electroncapture induced collapse rather than thermonuclear explosion.

关键词： stars evolution - binaries close - supernovae general - white dwarfs

The Gerber-Shiu Discounted Penalty Function for a Compound Binomial Risk Model with By-claims

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第1期31卷 181-190页

作者： Jin-zhu LI Rong wu School of Mathematical Sciences and LPMC Nankai University

A recursive formula of the Gerber-Shiu discounted penalty function for a compound binomial risk model with by-claims is obtained. In the discount-free case, an explicit formula is given. Utilizing such an explicit expression, we derive some useful insurance quantities, including the ruin probability, the density of the deficit at ruin, the joint density of the surplus immediately before ruin and the deficit at ruin, and the density of the claim causing ruin.

关键词： compound binomial risk model Gerber-Shiu function by-claims

Global Mild Solution of Stochastic Generalized Navier–Stokes Equations with Coriolis Force

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2018年第11期34卷 1635-1647页

作者： Wei Hua WANG Gang wu School of Mathematical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China School of Mathematics and Finance Putian University Putian 351100 P. R. China

In this paper, we apply Littlewood-Paley theory and Ito integral to get the global existence of stochastic Navier-Stokes equations with Coriolis force in Fourier-Besov spaces. As a comparison, we also give correspondi... 详细信息

关键词： Littlewood Paley theory Ito formula stochastic Navier Stokes equations Coriolis force

Dynamics of Two-Level Trapped Ion in a Standing Wave Laser in Noncommutative Space

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第5期47卷 921-926页

作者： YANG Xiao-Xue wu Ying department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We study the dynamics of a two-level trapped ion in a standing wave electromagnetic field in two-dimensional （2D） noncommutative spaces in the Lamb-Dicke regime under the rotating wave approximation. We obtain the explicit analytical expressions for the energy spectra, energy eigenstates, unitary time evolution operator, atomic inversion, and phonon number operators. The Rabi oscillations, the collapse, and revivals in the average atomic inversion and the average phonon number are explicitly shown to contain the information of the parameter of the space noncommutativity, which sheds light on proposing new schemes based on the dynamics of trapped ion to test the noncommutativity.

关键词： two-level trapped ion noncommutative space

Polychaete ecology in west of Taiwan Strait and around Taiwan Shoal

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1996年第4期15卷 515-527页

作者： wu Qiquan Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

This paper deals with. comprehensively, for the first the, the shoes comfortion, number and its distributional characteristics of polychaetes in the soft bottom in the west of the Taiwan Start. This Paper is sorted out onthe has of the data from the; polychaete samples collected with quantitative benthic grab and quantitative trawl in thebiolwied seasons in four cruises including 220 stations from 1984 to 1985. The survey areas were located from theMinjiang Estuary in the north to the south of the Taiwan Shoal in the south (22°23. 1'～25°43. 0'N, 116°30. 8' ～120°30. 7'E). The survey ststions are shown in Fin. 1.

关键词： Polychaete ecology

Area operator on Bergman spaces

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第7期49卷 987-1008页

作者： wu Zhijian department of Mathematics the University of Alabama Tuscaloosa AL 35487 USA

We characterize the non-negative measuresμ on the unit disk D for which the area operator Aμ is bounded from Bergman space Aαp to Lq ((δ)D).

关键词： area operators, Bergman spaces, Carleson measures.

Nonlinear dynamics of pork price in China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第6期14卷 1115-1121页

作者： ZHAO Guo-qing wu Qiong School of Economics Renmin University of China

This paper primarily analyzes the evolution path of China＇s pork price by employing the threshold autoregression model（TAR）. Considering the unit root test with a threshold effect and heteroskedasticity of the TAR model, we show that the pork price series is a unit root process in each regime, and the heteroskedasticity in the TAR model greatly affects the results of linearity test. We find that the changing process of pork price has two regimes： mild regime and expansion regime. In particular, a change belongs to an expansion regime if it is larger than 0.5881; otherwise, it falls in the mild regime.

关键词： bootstrap regime volatility autoregressive otherwise belongs expenditure prices household EGARCH