检索结果-南通市图书馆

Background of Existence of the Two Low-Lying Adjacent 4^(+) Narrow Resonances in ^(16)O Nucleus and Other 4-Boson Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第5期18卷 638-640页

作者： bao Cheng-guang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275

Based on an analysis of the inherent nodal structures of wave functions of 4-boson systems,we found that the internal energy of the 4_(1)^(+) state should be lower because its structure can be optimized without suffering a strong constraint arising from symmetry(while other 1≤L≤3 states suffer from this kind of constraints).Furthermore,two superior structures favorable in binding are found to be allowed to be possessed by 4^(+) *** findings would lead to the appearance of two adjacent 4^(+) states,as a common feature,in the low-lying spectra of 4 boson systems.

关键词： allowed Existence symmetry

Bose-Einstein Condensation in a Two-Dimensional System with Sixty Bosons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第2期17卷 123-125页

作者： bao Cheng-guang Department of Physics Zhongshan UniversityGuangzhou 510275

A 60-boson system confined on a sphere has been qualitatively studied based on symmetry considerations. The low-lying spectrum is dominated by the ground rotation band based on the fullerene structure. In this band all the L=1 to L=5 states are found to be prohibited by symmetry. Therefore, there is a large gap lying between the ground state and the first excited state. The magnitude of this gap, which is associated with the critical temperature of Bose-Einstein condensation, has been evaluated. It is found that, the smaller the radius of the sphere of confinement, the higher the critical temperature.

关键词： temperature structure state.

Analysis of the Low-Lying Spectra of Five-Nucleon Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第7期17卷 485-487页

作者： bao Cheng-guang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275(mailing address)

The wavefunctions are decomposed into components. The inherent nodal structure and the stability of these components are investigated. It is assumed that the low-lying states would be dominated by the components without inherent nodal surfaces. Based on this assumption, the composition of the wave functions of the low-lying states of 5He has been suggested and the qualitative feature of the spectrum has been explained.

关键词： nodal assumed qualitative

Inherent Nodal Structures of the Wavefunctions of a 4-Boson System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第1期14卷 20-23页

作者： bao Cheng-guang Department of Physics Zhongshan UniversityGuangzhou 510275

The effect of a kind of nodal surfaces originated from the inherent symmetry on a 4-boson system has been *** was found that these surfaces determine the accessibility of specific geometric structures.

关键词： surfaces symmetry system

Multi-model coupling-based dynamic control system of ladle slag in argon blowing refining process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第5期30卷 926-936页

作者： guang-da bao Ting Wu Duo-gang Wang xiao-bin Zhou Hai-chuan Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Shanghai Meishan Iron and Steel Co. Ltd.Nanjing 210039JiangsuChina

Since the current slagging of argon blowing refining process is relatively fixed,which cannot adapt to the fluctuation of converter smelting process,it poses the problems of poor metallurgical property of refining slag and a large amount of molten *** optimization system coupled with multiple models was proposed to dynamic control the ladle slagging in the argon blowing refining *** can compile the optimal dynamic slagging scheme in real time under the guarantee of deoxidation performance and reasonable *** argon blowing refining slag composition range of CaO/Al_(2)O_(3)=1.3-1.7,CaO/SiO_(2)=6-12,w(MgO)=2%-6% was determined based on FeO activity and liquidus temperature by equilibrium thermodynamic *** addition,it demonstrated better performance in the viscosity prediction task of the presented Visual Geometry Group 16-like one-dimensional convolutional neural network deep learning algorithm versus the Random Forest ensemble learning algorithm,as the adjusted coefficients of determination were 0.9712 and 0.9637,*** the system was applied in operation,the argon blowing refining process was stable,and the steel yield was enhanced,which promoted the intelligent steelmaking level while achieving the cost reduction and efficiency improvement.

关键词： Argon blowing refining process Deoxidation Viscosity model Deep learning Intelligent steelmaking

Synthesis,Characterization and DFT Calculation of a New Silver(I) Iodid Templated by Conjugated Cation:(ipq)_4Ag_4I_8

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第9期25卷 1148-1153页

作者： xiao guang-Can Center of Analysis and Measurement Fuzhou University Fuzhou Fujian 350002 China

A silver iodide, （ipq）4Ag418 1, has been synthesized in the presence of ipq （ipq = N-（isopentyl）-quinolinium） acting as a structure-directing reagent （SDA）. Compound 1 crystallizes in the triclinic system, space group PT, with a = 9.850（2）, b = 11.564（2）, c = 16.111（3） ,A ,α = 104.64（3）, β = 105.73（3）, γ = 94.37（3）o, V= 1688.3（7） A^3, Z = 2, D,= 2.205 g/cm^3, F（000） = 1042, C28H33Ag2l4N2, Mr= 1120.90, μ（MoKa） = 4.836 mm^-1, the final R = 0.0363 and wR = 0.0761 for 5465 observed reflections with 1 〉 2σ（I）. 1 consists of uncoordinated structure-directing molecule and inorganic moiety tuned by organic SDA. Tetrameric Ag4I8^4- anion in 1 is composed of edgesharing AgI4 tetrahedra and AgI3 planar triangles. Electrostatic interaction between organic counter cations and inorgan!c moieties is present and contributes to the crystal packing. 1 was further characterized with IR, UV-Vis, elemental analysis and cyclic voltammetry. Based on the crystal structure data, quantum chemical calculation with DFr method was used to reveal the electronic structure and optical property of 1.

关键词： coordination polymers template synthesis iodide quaternary ammonium

维普期刊数据库

Intrinsic background radiation of LaBr3(Ce)detector via coincidence measurements and simulations

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2020年第10期31卷 33-42页

作者： Hao Cheng bao-Hua Sun Li-Hua Zhu Tian-xiao Li guang-Shuai Li Cong-Bo Li xiao-guang Wu Yun Zheng School of Physics Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Medicine and EngineeringBeihang UniversityBeijing 100191China China Institute of Atomic Energy Beijing 102413China

The LaBr3(Ce)detector has attracted much attention in recent years because of its superior characteristics compared with other scintillating materials in terms of resolution and ***,it has a relatively high intrinsic background radiation because of the naturally occurring radioisotopes in lanthanum,actinium,and their daughter *** limits its applications in low-counting rate *** this study,we identified the radioactive isotopes in theφ3"x 3"Saint-Gobain B380 detector by a coincidence measurement using a Clover detector in a low-background shielding ***,we carried out a Geant4 simulation of the experimental spectra to evaluate the activities of the main internal radiation *** total activity of the background radiation of B380 is determined to be 1.523(34)Bq/cm^*** main sources include 138La at 1.428(34)Bq/cm^3,207Tl at 0.0135(13)Bq/cm^3,211Bi at 0.0136(15)Bq/cm^3,215Po at 0.0135(3)Bq/cm^3,219Rn at 0.0125(12)Bq/cm^3,223Fr at 0.0019(11)Bq/cm^3,223Ra at 0.0127(10)Bq/cm^3,227Th at 0.0158(22)Bq/cm^3,and 227Ac at 0.0135(13)Bq/cm^*** these,the activities of 207Tl,211Po,215Po,223Fr,and 227Ac are deduced for the first time from the secular equilibrium established in the decay chain of 227Ac.

关键词： LaBr3 Coincidence measurement technique Intrinsic radiation GEANT4 simulation

维普期刊数据库

Blockage robust millimeter-wave networks

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第8期60卷 77-79页

作者： guang YANG Ming xiao KTH Royal Institute of Technology

Millimeter-wave(mm Wave)technique(from around 24 GHz to 300 GHz)becomes a key enabler of high date rates for future mobile communications[1].In spite of many appealing benefits,mm Wave communications also encounter several critical challenges,i.e.,very weak capability in penetration,diffraction and high-order reflections,due to the short wavelength[2].That indicates,the transmission in mm Wave bands can be blocked easily if any obstacle,e.g.,human body or vehicle in motion,occurs on the propagation path.

关键词： Wave work in AP of as link TDMA Blockage robust millimeter-wave networks is or MBS MAC wave that

Female choice impacts resident male takeover in golden snub-nosed monkeys(Rhinopithecus roxellana)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Zoological Research 2018年第4期39卷 266-271页

作者： Gu Fang Jing Chen Ru-Liang Pan xiao-guang Qi bao-Guo Li College of Life Sciences Northwest University Shaanxi Key Laboratory for Animal Conservation Northwest University School of Anatomy Physiology and Human Biology University of Western Australia

In primate species with social systems consisting of one-male breeding units （OMUs）, resident male takeover represents a major challenge to individual reproductive success and mating strategies. The golden snub-nosed monkey （Rhinopithecus roxellana） is characterized by large multilevel societies （MLS） comprised of several OMUs and all-male units （AMUs）; however, the factors and mechanisms associated with resident male takeover, which offer important insight into primate reproduction and social strategies, are still poorly understood. Based on 5-year monitoring data from a free-ranging herd of golden monkeys from the Qinling Mountains in China, we categorized three phases of an OMU, that is, a rising phase, developing phase, and declining phase. The rising and declining phases were unstable periods in which male takeover in an OMU might occur. Factors causing takeover, such as leader male rank, fighting ability, reproduction rate, and affiliation （proximity, allogrooming）, were analyzed for males and females and for different OMUs. Results indicated that the new resident male＇s fighting ability was lower than that of the former resident male in 23 cases. After replacement, the rank order of the new resident male significantly declined. Females involved in a takeover increased their distance from the resident male and decreased mating frequency during the three months prior to takeover. Females with infants under one-year-old had a marked effect on the specific time of takeover occurrence. These results suggested that female choice was the main factor deciding whether a takeover attempt was successful. Furthermore, rather than male conflict, females more often initiated and affected takeover and outcome, implying that the social status and competitive ability of the males played lesser roles during takeover.

关键词： Rhinopithecus roxellana Female matechoice Takeover Resident male tenure Socialnetwork analysis

维普期刊数据库