检索结果-南通市图书馆

Indication of Low-Energy BC5 Structures

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 2010年第1期27卷 182-185页

作者： shao xi National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093

The Bond counting rule is proved to be an important and effective criterion for searching low-energy metastable structures for ternary boron carbon nitrogen （B-C-N） compounds. The Bond counting rule, however, has its limitations for the binary diamond-like or ternary B-C-N polymorphs with the same bond ratio. First-principles calculations validate that the Mulliken charge difference may serve as an indication of low-energy crystal structures, and clarify the energy difference among those polymorphs to some extent. For example, we predict two ground state phases ofsuperhard BC5 （named as I-BC5 and II-BC5）, which are 0.28 and 0.27eV/formula lower in energy than the P3m1 structure reported recently in the literature [Calandra et al. Phys. Rev. Lett. 101（2008）016401], respectively. The charge transfer analysis reveals that the smaller Mulliken charge difference for the same kind of element will result in more stable structures.

关键词： Rules Energy Polymorphism

LSB steganalysis of speech data based on distance measure and ML decision

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 103-107页

作者： DENG Zong-yuan shao xi YANG Zhen Institute of Signal and Information Processing Nanjing University of Postsand Telecommunications Nanjing 210003 China

Steganalysis can be used to classify an object whether or not it contains hidden information. In this article, is presented, a novel approach to detect the presence of least significant bit（LSB） steganographic messages in the voice secure communication system. A distance measure, which has proven to be sensitive to LSB steganography by analysis of variance （ANOVA）, is denoted to estimate the difference between the host signal and the stego signal. Then an maximum likelihood （ML） decision is combined to form the classifier. Statistical experiments show that the proposed approach has a highly accurate rate and low computational complexity.

关键词： speech signal processing LSB steganography steganalysis ML decision

The updated Bulk Lorentz Factors of Gamma-Ray Burst X-Ray Flares

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第6期17卷 37-46页

作者： shao-Qiang xi Shuang-xi Yi Yuan-Chuan Zou Fa-Yin Wang College of Physics and Engineering Qufu Normal University Qufu 273165 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Astronomy and Space Science Nanjing University Nanjing 210093 China Key Laboratory of Modem Astronomy and Astrophysics (Nanjing University) Nanjing 210093 China

X-ray flares are the most common phenomena in the afterglow phase of gamma-ray bursts （GRBs） in the Swift era, and are known as a canonical component in X-ray afterglows. In this work, we constrain the Lorentz factor of X-ray flares with an updated sample. We extensively search for X-ray light curves showing flare and jet break simultaneously. A smooth broken power law function is used to fit the jet breaks in 11 GRBs. We also use a smooth broken power law function to fit the profile of X-ray flares, and the total number of the flares is 20. We obtain the lower and upper limits of Lorentz factor （Гx） with the timescale, half-opening angle and mean luminosity of the X-ray flares for interstellar medium （ISM） and wind cases. The lower limits on Px range from tens to a few hundred, and the upper limits are mainly about a few hundred. We also apply the limited Lorentz factor to test correlations of Г0 - γ,iso and Г0 - Lγ,iso for GRBs, and find X-ray flares in the ISM case are much more consistent with those of prompt emission than the wind case in a statistical sense for both correlations. X-ray flares are almost consistent with the trend in the correlations of Г0 - Eγ,iso（Lγ,iso） for prompt GRBs, indicating X-ray flares and prompt bursts may have the same physical origin.

关键词： gamma ray bursts -radiation mechanism: non-thermal

Epidemiological characteristics and disease spectrum of emergency patients in two cities in China:Hong Kong and Shenzhen

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2020年第1期11卷 48-53页

作者： shao-xi Chen Karren Fan Ling-pong Leung Accident and Emergency Department University of Hong Kong-Shenzhen Hospital

Dear editor,China is the most populated country and the second economic entity *** Kong and Shenzhen are two adjacent cities in southern China,with similar environmental,cultural,ethnic groups,and economic *** both have a very interesting turning point in their destiny,leading to a miraculous economic ***,their government structure and health care system are totally different.[1]This is a vivid example of Deng xiaoping’s formulation of the principle of“one country,two systems”.

关键词： editor turning totally

Effect of annealing temperature on interfacial and electrical performance of Au-Pt-Ti/HfAlO/InAlAs metal-oxide-semiconductor capacitor

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 423-428页

作者： He Guan Cheng-Yu Jiang shao-xi Wang Northwestern Polytechnical University Xi'an 710072China

HfAlO/InAlAs metal-oxide-semiconductor capacitor (MOS capacitor) is considered as the most popular candidate of the isolated gate of InAs/AlSb high electron mobility transistor (HEMT). In order to improve the performance of the HfAlO/InAlAs MOS-capacitor, samples are annealed at different temperatures for investigating the HfAlO/InAlAs interfacial characyeristics and the device's electrical characteristics. We find that as annealing temperature increases from 280 ℃ to 480 ℃, the surface roughness on the oxide layer is improved. A maximum equivalent dielectric constant of 8.47, a minimum equivalent oxide thickness of 5.53 nm, and a small threshold voltage of -1.05 V are detected when being annealed at 380 ℃;furthermore, a low interfacial state density is yielded at 380 ℃, and this can effectively reduce the device leakage current density to a significantly low value of 1×10-7 A/cm2 at 3-V bias voltage. Therefore, we hold that 380 ℃ is the best compromised annealing temperature to ensure that the device performance is improved effectively. This study provides a reliable conceptual basis for preparing and applying HfAlO/InAlAs MOS-capacitor as the isolated gate on InAs/AlSb HEMT devices.

关键词： HfAlO/InAlAs MOS-capacitor annealing temperature interface leakage current

Phase Evolution of Cubic ZnS Annealed in Mild Oxidizing Atmosphere

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第3期29卷 227-230页

作者： XUE Shu-Wen ZHANG Jun shao Le-xi Department of Physics Zhanjiang Normal CollegeZhanjiang 524048

ZnS thin films are prepared by thermal evaporation of high-purity ZnS powder on quartz glass *** samples were annealed in floating argon at temperatures from 300℃to 900℃.The effects of annealing temperature on the structural and optical properties were investigated by x-ray diffraction(XRD),scanning electron microscope(SEM)and optical *** results show that annealing below 500℃is beneficial to improve the quality of ZnS *** the annealing temperature exceeds 500℃,ZnS is gradually oxidized into ZnSO4,which has evident influences on the structural and optical properties of ZnS films.

关键词： annealing purity floating

Structural Vector Description and Estimation of Normal Boiling Points for 66 Aromatic Hydrocarbons

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 Chemical Letters 2000年第12期11卷 1089-1092页

作者： Shu Shen LIU Chun Sheng YIN shao xi CAI Zhi Liang LI College of Biomedical Engineering Chongqing UniversityChongqing 400044 Department of Applied Chemistry University of Science and Technology of ChinaHefei 230026 Department of Applied Chemistry Guilin Institute of TechnologyGuilin 541004

A molecular vector-type descriptor containing 6 variables is used to describe the structure of aromatic hydrocarbons (AHs) and relate to normal boiling points (bp) of AHs. The col relation coefficient (R) between the estimated bp and experimental bp is 0.9988 and the root mean square error (RMS) is 7.907 degreesC for 66 AHs. The RMS obtained by cross-validation is 9.131 degreesC, which implies the relationship model having good prediction ability.

关键词： molecular vector-type descriptor aromatic hydrocarbon normal boiling point

Treatment for subtrochanteric fracture and subsequent nonunion in an adult patient with osteopetrosis:A case report and review of the literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第35期9卷 11007-11015页

作者： Hao Yang Guo-xi shao Zhen-Wu Du Zheng-Wei Li Department of Orthopedics The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Departments of Orthopedics The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina

BACKGROUND As a congenital metabolic bone disease caused by defective osteoclastic resorption of immature bone,osteopetrosis is characterized by diffused sclerosis of bones,brittle bones,easy fracturing,narrow medullary canals,and a weak fracture healing *** present,clear standards and principles for the treatment of fractures in patients with osteopetrosis are ***-operative treatment can prevent fracture hematoma and preserve the blood supply to the bone fragments,while being associated with frequent failures and higher mortality ***,closed reduction and internal fixation with intramedullary nail(CRIF+IMN)approaches can also protect blood supply to the fracture ***,IMN cannot be used for the vast majority of patients with osteopetrosis due to the narrowing of medullary ***,open reduction and internal fixation with plate remains the most appropriate surgical method for treating fractures in patients with osteopetrosis,but this approach is complicated by the lack of intramedullary hematopoiesis in such *** healing primarily depends on the blood supply to the external *** reduction can also easily destroy the periosteum and cause delayed fracture healing or even nonunion;however,CRIF may be the most practical *** a result,it would be prudent to solve the difficulty of drilling during the operation and the problem of postoperative *** SUMMARY In 2018,we treated an adult patient with osteopetrosis presenting with a subtrochanteric *** fracture was fixed using a femoral locking compression *** of delayed consolidation,at 12 mo postoperatively the patient was further treated with platelet-rich plasma(PRP)combined with radial extracorporeal shock wave therapy(rESWT).Antero-posterior and lateral radiographs obtained at the latest follow-up(10 mo)showed that the callus had grown at the original fracture site,and the medial fracture line almost *** Ost

关键词： Osteopetrosis Subtrochanteric fracture Nonunion Platelet-rich plasma Radial extracorporeal shock wave therapy Case report

THE STUDY OF LUMINOL-H_2O_2-IO_4^--S^(2-)CHEMILUMINESCENCE SYSTEM AND ITS APPLICATION

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 Chemical Letters 1991年第9期2卷 701-702页

作者： shao Qing LI xi’an College of Geology,xi’an 710054

This paper reports a new chemiluminescence system ***- H_2O_2-IO_4^- catalyzed by sulphide ion(S^(2-)).Based on this catalysis,a new chemiluminescence(CL)method for the determination of trace S^(2-)is pro- *** detection limit is 0.2μg/LS^(2-),the linear dynamic range is 5μg to 100βμg/L S^(2-)and the variation coefficient at an sulphide concentration of 100μg/L S^(2-)is 4.5%(n=10).The method has been satisfactory applied to the determination of trace sulphide ion in water.

关键词： IO Zhang CHEMILUMINESCENCE SYSTEM AND ITS APPLICATION THE STUDY OF LUMINOL-H2O2-IO4 ITS