检索结果-南通市图书馆

Improving the Performance of Practical Decoy-State Measurement-Device-Independent Quantum Key Distribution with Biased Basis Choice

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

Communications in Theoretical Physics 2018年第9期69卷 331-336页

作者： chun-Hui Zhang chun-mei Zhang Qin Wang Institute of Signal Processing Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network TechnologyNanjing University of Posts and TelecommunicationsMinistry of EducationNanjing 210003China

Statistical fluctuations are unavoidable in realistic quantum key distribution (QKD) due to finite-size effect. Based on the four-intensity proposal on measurement-device-independent QKD (MDI-QKD) in [Phys. Rev. A93 (2016) 042324], we particularly analyze the scenario that only three intensities are used, namely a three-intensity decoy-state MDI-QKD with biased basis choice. After performing full parameter optimization method, simulations results demonstrate that this scenario can obtain distinct enhancement compared with the conventional unbiased threeintensity decoy-state method, e.g. Xu et al.’s [Phys. Rev. A 89 (2014) 052333]. Furthermore, results also show that it works more efficiently by using HSPS than using WCS at longer transmission distance.

关键词： measurement-device-independent quantum key distribution statistical fluctuations biased basis choice

Recombinant Apoptin Gene Retrovirus Induces Apoptosis in Human Breast Cancer Cells 435

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2009年第3期21卷 194-201页

作者： chun-mei Yu Hai-tao Xu Jie Du Department of Breast Center Beijing Chuiyangliu Hospital Beijing 100022 China Department of Abdominal Surgery the Third Affiliated Hospital Harbin Medical University Harbin 150086 China Department of Biology Graduate School Chinese Academy of Sciences Beijing 100049 China

Objective： To construct recombinant Apoptin gene （vp3） retrovirus pLVP3 and to study its apoptosis inducing effect on human breast cancer cells 435 as well as to discuss its mechanism in vitro and in vivo. Methods： vp3 gene was cloned and recombinated into retrovirus vector pLP-LNCX-VP3 （pLVP3） at loxP site, which was transformed into package cell line PT67 and then into NIH3T3 cells for titer assay. The human breast cancer cell line 435 was infected with retrovirus pLVP3, and then MTT assay and Western blotting were adopted to detect cellular proliferation and Apoptin protein expression. Forty-eight hours after infection flow cytometry （FCM） was used for apoptosis detection and Surface Enhanced Laser Desorption Ionization-Time of Flight-Mass Spectrometry （SELDI-TOF-MS） was used for protein profile assay. Nude mice model of human breast cancer cells 435 was set up to observe the tumor inhibiting rates of pLVP3, and TUNEL assay was used to detect tumor apoptosis as well as real-time PCR for vp3 gene expression. Results： Recombinant plasmid pLVP3 was successfully constructed. Virus titer reached to 5×10^8 pfu/ml in the PT67 culture supernatant. Forty-eight hours after infection, cellular inhibition rate was 65.1% in MTT assay, higher than that in blank control （P〈0.05） and Apoptin protein expressed more in test group in Western blotting. FCM assay showed apoptotic peaks with a percentage of 15.42%. SELDI-TOF-MS findings suggested that two protein peaks, M_2544.1＋H and M_3712.4＋H, were statistically different between infection group and control group （P〈0.05）. The tumor inhibition rates in pLVP3 group were 65.52% and 68.23%, much higher than that of control group （t=4.06, P〈0.01）. TUNEL assay findings showed that positive yellow stains were seen in pLVP3 retrovirus group and 5-FU positive control group without difference （t1=1.05, t2=0.84, P〉0.05）. Conclusion： The experiment demonstrated that vp3 could induce apoptosis in tumor cells in vivo and in vitro, whic

关键词： Apoptin Retrovirus Gene therapy Breast cancer

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2015年第2期10卷 87-90页

作者： chun Li Fei Long Dong-Cheng mei Department of Computer Science Puer College Puer 665000 China Faculty of Science Kunming University of Science and Technology Kunming 650500 China Department of Physics Yunnan University Kunming 650091 China

The effects of correlation between additive and multiplicative noises on the symmetry of an asymmetric bistable system are investigated. The steady-state probability distribution function of the system was calculated by using analytical and numerical methods. Results indicate that i） for the case of positive correlation between noises, as the correlation strength between additive and multiplicative noises, λ, increases, the symmetry of the system is restored; ii） for the case of negative correlation between noises, as the absolute value of λ increases, the symmetry of the system is destroyed; and iii） the analytic prediction agrees well with the stochastic simulation result.

关键词： asymmetry bistable system correlated noises symmetrical characteristic

Effects of correlation time between noises on the noise enhanced stability phenomenon in an asymmetric bistable system

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2015年第1期10卷 95-101页

作者： chun Li Zheng-Lin Jia Dong-Cheng mei Department of Computer Science Puer College Puer 665000 China Department of Physics Yuxi Normal University Yuxi 653100 China Department of Physics Yunnan University Kunming 650091 China

The effects of the correlation time τ between noises on the noise-enhanced stability （NES） phe- nomenon in an asymmetric bistable system driven by cross-correlated noise are investigated. The ex- pressions for the average escape time from the left metastable state TL and from the right metastable state TR are derived. The results indicate that： i） The NES effect is suppressed as the correlation time τ increases for two metastable states; ii） The increase in τ speeds up the escape process from the right state for positively correlated noise, whereas its role is reverses for negatively correlated; iii） In the escape process from the left state, the role of τ is opposite to that in escape from the right state.

关键词： asymmetric bistable system noise correlation time noise enhanced stability

A new route of fabricating porous polyimide membranes

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 782-785页

作者： Jiu-mei Xiao Xin-chun Shang Li-ping Qin School of Applied Science University of Science and Technology Beijing Beijing 100083 China

A novel experimental route to fabricate porous polyimide membranes （PPMs） with ideal air permeability was reported. The polymer solution layer consisting of the corresponding polyamic acid （PAA）, solvent, and dibutyl phthalate （DBP） with a boiling temperature of 340℃ was treated by a simple process. The polymer solution layer was first treated at a lower temperature （about 150℃）, then the received solid membrane was further imidized at a higher temperature （about 270℃）, and finally, DBP was removed from the membrane at a temperature above its boiling temperature. The final asymmetric polyimide membrane with a dense skin layer was obtained. To improve the air permeability of the polyimide membranes, the polymer solution layer was treated between two substrates. And the PPMs with open pores on both sides are fabricated and the air permeability of the films is improved greatly.

关键词： polyimide polyamic acid membrane additive porous materials

Increased precipitation magnifies the effects of N addition on performance of invasive plants in subtropical native communities

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2022年第3期15卷 473-484页

作者： Xiang-Qin Li sai-chun Tang Yu-mei Pan chun-Qiang Wei Shi-Hong Lü Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain Guangxi Institute of BotanyGuangxi Zhuang Autonomous Region and Chinese Academy of SciencesGuilin 541006China Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou 318000China

Nitrogen(N)deposition,precipitation and their interaction affect plant invasions in temperate ecosystems with limiting N and water resources,but whether and how they affect plant invasions in subtropical native communities with abundant N and precipitation remains *** constructed in situ artificial communities with 12 common native plant species in a subtropical system and introduced four common invasive plant species and their native counterparts to these *** compared plant growth and establishment of introduced invasive species and native counterparts in communities exposed to ambient(CK),N addition(N+),increased precipitation(P+)and N addition plus increased precipitation(P+N+).We also investigated the density and aboveground biomass of communities under such conditions.P+alone did not enhance the performance of invasive species or native counterparts.N+enhanced only the aboveground biomass and relative density of invasive species.P+N+enhanced the growth and establishment performance of both invasive species and native *** growth and establishment parameters of invasive species were greater than those of native counterparts under N+,P+and P+N+*** density and aboveground biomass of native communities established by invasive species were significantly lower than those of native communities established by native counterparts under P+N+*** results suggest that P+may magnify the effects of N+on performance of invasive species in subtropical native communities where N and water are often abundant,which may help to understand the effect of global change on plant invasion in subtropical ecosystems.

关键词： community aboveground biomass community density growth and establishment increased precipitation invasive plants nitrogen addition subtropical native communities

Band Offset and Optical Property of (ZnS)_(n)/(Si2)_(n) (110) Superlattice

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 Physics Letters 1996年第6期13卷 458-460页

作者： LI Kai-hang HUANG mei-chun WANG Ren-zhi Department of Physics Xiamen UniversityXiamen 361005

Supercell self-consistent calculation of band structures of(ZnS)_(n)/(Si_(2))_(n) (110) (n=2,3,4,5)has been performed by means of linear muffin-tin orbitals *** valence-band offset of such systems is calculated by frozen optential method and their Joint density of states has been computed by tetrahedron *** results show that the(ZnS)n/(Si_(2))n(110)superlattices have a large valence-band offset and their optical properties integrate exellent optical properties of bulk ZnS and that of Si.

关键词： method Si_(2)

FLOW PATTERN AND PRESSURE LOSS OF OIL-WATER TWO-PHASE FLOW IN HORIZONTAL STEEL PIPE

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

Journal of Hydrodynamics 2005年第2期17卷 194-198页

作者： CHENJie YANDa-fan ZHAOJing-mei ANWei-jie YANDa-chun DepartmentofPetroleumEngineering UniversityofPetroleumBeijing102249China／／DepartmentofMechanicsPekingUniversityBeijing100871China／／CnoocResearchCenterBeijing100027China DepartmentofPetroleumEngineering UniversityofPetroleumBeijing102249China CnoocResearchCenter Beijing100027China DepartmentofMechanics PekingUniversityBeijing100871China

Experimental Study on oil-water two-phase flow patterns and pressure loss was conducted on a horizontal steel pipe loop with 26.1mm inner diameter and 30m total length. The working fluids are white oil, diesel oil and tap water. Several instruments, including a new type of liquid-probe are successfully integrated to identify 7 different flow patterns. The characteristics of the flow patterns and the transition process were observed and depicted in this paper. Investigation revealed that the pressure loss was mainly depended on the flow patterns.

关键词： oil water flow pattern pressure loss

Geometrical statistical channel model arisen from scatterers around the mobile with an inverted-parabolic spatial distribution

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 2012年第5期19卷 1-8页

作者： ZHOU Jie LI chun-mei QIU Lin HISAKAZU Kikuchi Department of Communications Nanjing University of Information Science and Technology Nanjing 210044 China Department of Electronic and Electrical Engineering Niigata University Niigata 950-2181 Japan

In this paper, firstly presented a geometrically based statistical channel model with scatterers that are with an inverted parabolic spatial distribution around mobile station （MS） within a circle wherein the base station （BS） and MS are included. This paper proposed a technique to simply derive probability density functions （PDFs） of angle of arrival （AOA）, time of arrival （TOA） and Doppler spectra to characterize the outdoor macrocell and microcell environments by employing various distances between BS and MS, or different size of circular region. Employing this channel model, we analyze the impacts of a directional antenna at BS with the main-lobe width 2~z on the fading and the Doppler spectra.

关键词： inverted parabolic PDFs circular and elliptical scattering models directional antenna macrocell and microcell