检索结果-南通市图书馆

Analysis of the call blocking rate of two-hop-relay cellular system in the dead spots

在线全文

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4期14卷 46-52页

作者： LU wei-feng wu Meng Communication and Information Engineering Institute Nanjing Universityof Posts and Telecommunications Nanjing 210003 China

In a traditional cellular system, the call requests initiated by mobile stations （MSs） must be carded through a base station （BS） via the cellular interface, but when MSs are located in the dead spots, their call requests will be blocked because the MSs cannot communicate with the BS. It is considered to relay these blocked calls requested using Ad-hoc network, which will improve the performance of the system as a whole. This article first introduces a novel architecture of the two-hop-relay cellular system in the dead spots, and then analyzes and compares the call blocking rate of the traditional cellular and the two-hop-relay cellular system respectively under three different conditions. The first and second conditions are the traditional cellular system without and with taking account of the effect of the dead spots. The third condition is the two-hop-relay cellular system with taking account of the effect of the dead spots. Numerical analytical result shows that the two-hop-relay cellular system can obtain lower call blocking rate than the traditional cellular system when considering the effect of dead spots. Consequently, this novel architecture can resolve the problem of coverage limitation of a traditional cellular system effectively.

关键词： two-hop-relay cellular system call blocking rate,dead spots

A new power generation method utilizing a low grade heat source

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第2期13卷 140-145页

作者： wei-feng wu Xin-ping LONG Xiao-ling YU Quan-ke feng School of Energy and Power Engineering Xi ＇an Jiaotong University Xi ＇an 710049 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

Energy crisis make the effective use of low grade energy more and more urgent. It is still a worldwide difficult conundrum. To efficiently recover low grade heat, this paper deals with a theoretical analysis of a new power generation method driven by a low grade heat source. When the temperature of the low grade heat source exceeds the saturated temperature, it can heat the liquid into steam. If the steam is sealed and cooled in a container, it will lead to a negative pressure condition. The proposed power generation method utilizes the negative pressure condition in the sealed container, called as a condensator. When the condensator is connected to a liquid pool, the liquid will be pumped into it by the negative pressure condition. After the conden- sator is filled by liquid, the liquid flows back into the pool and drives the turbine to generate electricity. According to our analysis, for water, the head pressure of water pumped into the condensator could reach 9.5 m when the temperature of water in the pool is 25 ℃, and the steam temperature is 105 ℃. Theoretical thermal efficiency of this power generation system could reach 3.2% to 5.8% varying with the altitude of the condensator to the water level, ignoring steam leakage loss.

关键词： Low grade heat Power generation Condensation Energ-v storage Renewable energy

Entropy variances of pure coherent states in the diffusion channel

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第9期33卷 384-388页

作者： wei-feng wu Yong Fang Peng Fu School of Mechanical and Electrical Engineering Chizhou UniversityChizhou 247000China Anhui Research Center of Semiconductor Industry Generic Technology Chizhou 247000China

Using the operator correspondence of the real and fictious modes in the thermo entangled state representation, wesolve the quantum master equation describing the diffusion channel and obtain the Kraus operator-sum representation ofits analytical solution. we find that the pure coherent states evolve into the new mixed thermal superposed states in thediffusion channel. Also, we investigate the statistical properties of the initial coherent states and their entropy evolutions inthe diffusion channel, and find that the entropy evolutions are only related to the decay time and without the amplitudes ofthe initial coherent states.

关键词： entangled state representation diffusion channel coherent state entropy evolution

Trans-cis photoisomerization of azobenzene by n→π* excitation:A semiclassical dynamics study

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第11期19卷 1379-1382页

作者： Shuai Yuan wei feng wu Yusheng Dou Jian She Zhao Institute of Computational Chemistry Chongqing University of Posts and Telecommunications Chongqing 400065 China Department of Chemistry Northwest University Xi＇an 710069 China Department of Physical Sciences Nicholls State University LA 70310 USA

A realistic dynamics simulation study is reported for the trans-cis photoisomerization of azobenzene triggered by the n →π^＊ excitation and the results show that the formation ofcis isomer follows the rotational motion around the N=N bond. The simulation find that the CNN bond angle bending vibrations also play a significant role in the vibronic coupling between the HOMO and LUMO, which essentially leads a nonadiabatic transition of the molecule to the electronic ground state.

关键词： Azobenzene Photoisomerization Semiclassical Dynamics simulation

Expression analysis of chlorophyllid a binding protein a secretory, red fluorescence protein in the midgut of silkworm, Bombyx mori

在线全文

学校读者我要写书评

暂无评论

Insect Science 2014年第1期21卷 20-30页

作者： Lin Chen Rui Yang Xiao-Long Hu Xing-wei Xiang Xiao-feng wu Institute of Sericulture and Apiculture College of Animal Sciences Zhejiang University Hangzhou China

Chlorophyllid a binding protein （ chbp） was recently characterized by its ability to bind the prosthetic group of chlorophylls and little information is known regarding its expression. In the present study, we found that chpb was expressed highly and exclusively in the midgut of silkworm, Bombyx mori. The expression level of chbp was very high in the newly molted fifth instar larvae followed by gradual decline in the same instar. Our results demonstrated that CHBP was a secretory protein and located mainly in the apical of midgut epithelial cells. Real-time polymerase chain reaction analysis results showed that chpb highly expressed in the anterior midgut, threefold and sixfold higher compared with that of the middle midgut and posterior midgut, respectively, and chpb expression declined in darkness. In addition, the expression of chbp was affected by high-dose virus or bacterium infection.

关键词： Bombyx mori chlorophyllid binding protein expression midgut

Chordomas of the upper cervical spine： clinical characteristics and surgical management of a series of 21 patients

维普期刊数据库评论

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 Medical Journal 2014年第15期127卷 2759-2764页

作者： Zhou Hua Jiang Liang wei feng Yu Miao wu fengliang Liu Xiaoguang Liu Zhongjun Dang Gengting Department of Orthopaedics Peking University Third HospitalBeijing Key Laboratory of Spinal Diseases Beijing 100191 China

Background Chordomas of the upper cervical spine are rare and present unique surgical *** study aimed to describe the clinical characteristics and surgical management of patients with chordomas of the upper cervical *** Twenty-one patients with chordomas of the upper cervical spine who were treated in Peking University Third Hospital from January 1999 to October 2012 were retrospectively *** was calculated by the Kaplan-Meier method and was compared between groups using the log-rank *** The postoperative diagnosis was classical chordoma in 20 cases and chondroid chordoma in one *** mean operative time was 9.5 hours （range 6-17 hours）,and the mean blood loss was 2 812 ml （range 700-4 800 ml）.There were two postoperative *** vertebral artery ligation was performed in six patients,cervical nerve roots were cut in six patients,and the external branch of the superior laryngeal nerve was repaired after being cut in one *** patients developed postoperative velopharyngeal incompetence,and loosening of the occipitocervical screws was observed in one *** recurrence rate was 66.7% （10/15） after a mean follow-up period of 46.8 months （range 14-150 months）.The 5-and 10-year overall survival rates were （39.8±13.1）% and （31.9±12.7）%,*** was a significant difference in survival rate between patients who underwent surgery and those who did *** In spite of the high rates of recurrence and complications after surgical treatment of chordomas of the upper cervical spine,intralesional resection combined with adjuvant radiotherapy remains the optimal treatment to prolong survival.

关键词： chordoma atlases general surgery therapeutics atlantoaxial

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang feng Gao Yu-Gui Peng Peng wu Zong-Lin Li Xue-feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

Proteomic analysis identifies translationally controlled tumor protein as a mediator of phosphatase of regenerating liver-3-promoted proliferation, migration and invasion in human colon cancer cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第22期124卷 3778-3785页

作者： CHU Zhong-hua LIU Lu ZHENG Chao-xu LAI wei LI Shou-feng wu Heng ZENG Yu-jie ZHAO Hai-yan GUAN Yu-feng Department of Medical Research Center （Zhao HY） the Sun Yat-sen Memorial Hospital Sun Yat-sen University Guangzhou Guangdong 510120 China

Background Considerable evidence suggests that phosphatase of regenerating liver-3 （PRL-3） plays multiple roles in cancer metastasis; however, the molecular mechanisms remain largely unknown. The aim of this study was to identify proteins associated with PRL-3-promoted colon cancer metastasis, by comparative proteomic analysis. Methods Proteomes of human colon cancer LoVo cells transfected with PRL-3 gene （LoVo-PRL-3） or empty vector PAcGFP-C3 （LoVo-control） were compared using 2D gel electrophoresis. Proteins that varied significantly in concentration were selected and identified using mass spectrometry. Expression of translationally controlled tumor protein （TCTP） mRNA and protein in LoVo-PRL-3 and LoVo-control cells was detected by real-time PCR and Western blotting. Small interfering RNA （siRNA） targeting TCTP was used for silencing TCTP expression in LoVo-PRL-3 cells. Functional significance of TCTP in PRL-3-promoted colon cancer cell proliferation, migration and invasion was investigated by Cell Counting Kit-8 assay and transwell chamber. Results Seventeen proteins displaying significant and reproducible differences between LoVo-PRL-3 and LoVo-control cells were identified. Ten proteins were upregulated and seven were downregulated in LoVo-PRL-3 cells when compared with LoVo-control cells. Eight identified proteins are associated with distinct steps of tumor metastasis： ubiquitin-like protein ISG15, interleukin-18, TCTP, serpin B5, annexin A3, macrophage-capping protein, ATP-dependent RNA helicase DDX3X, and cathepsin D. Real-time PCR and Western blotting results showed that both TCTP mRNA and protein were significantly increased in LoVo-PRL-3 cells compared to LoVo-control cells. Transfection with TCTP siRNA significantly reduced the expression of both mRNA and protein levels of TCTP in LoVo-PRL-3 cells. Knockdown of TCTP by siRNA inhibited PRL-3-promoted proliferation, migration and invasion of LoVo-PRL-3 cells. Conclusion Our results imply that TCTP might b

关键词： colon cancer metastasis proteomics phosphatase of regenerating liver-3, translationally controlled tumor protein

Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 97-108页

作者： Pan Guo Hong-Bo Jin Cong-feng Qiao Yue-Liang wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences The School of Physical Sciences University of Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University National Astronomical Observatories Chinese Academy of Sciences Institute of Theoretical Physics Chinese Academy of Sciences

For space-based gravitational wave （GW） detection,the main noise source for massive black hole binaries （MBHBs） is attributed to approximately 10～7double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratio ?DL/DLat the 95%confidence level,is enhanced by factors of ～*** angular resolutions,denoted by??s,are enhanced by a factor of ～*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries