检索结果-南通市图书馆

A Novel Radio Resource Management for Interference Mitigation in OFDMA System

在线全文

学校读者我要写书评

暂无评论

China Communications 2010年第1期7卷 23-29页

作者： Gao peng Meng Dexiang Song zhiyuan tu Guofang Grad Univ Chinese Acad Sci Beijing 100049 Peoples R China China Mobile Grp Design Inst Co Ltd Beijing 100080 Peoples R China

In Orthogonal Frequency Division Multiple Access (OFDMA) systems, such as Long Term Evolution (LTE) and so on, the resources used by each user are orthogonal, and the OFDMA systems performances are mainly affected by the inter-cell interference. Therefore, the inter-cell interference mitigation technology becomes a hotspot. The objective of interference mitigation technologies used in OFDMA systems are to increase cell-edge throughput and average cell throughput. In this paper, the Resource Block Planning (BRBP) based scheme is proposed to mitigate the inter-cell interference and improve the cell-edge throughput. Comparison between the simulation results of BRBP and Round Robin (RR) illustrates that the enhanced performance of BRBP.

关键词： OFDMA inter-cell interference mitigation cell-edge throughput resource block planning scheme

Study of semileptonic decay of Bs^-0→φI^+I^- in QCD sum rule

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第9期72卷 58-69页

作者： Ying-Quan peng Mao-zhi Yang School of Physics Nankai UniversityTianjin 300071China

In this work we study the semileptonic decay of Bs^-0→φI^+I^-(l=e,μ,τ) with the QCD sum rule method. We calculate the Bs^-0→φ ftranslation form factors relevant to this semileptonic decay, then the branching ratios of Bs^-0→φI^+I^-(l=e,μ,τ)decays are calculated with the form factors obtained here. Our result for the branching ratio of Bs^-0→φμ^+μ^- agree very well with the recent experimental data. For the unmeasured decay modes such as Bs^-0→φe^+e^- and Bs^-0→τ^+τ……-, we give theoretical predictions.

关键词： semileptonic decay form factor QCD sum rule

Molecular simulations of methane, ethane and propane adsorption on TON

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) 2009年第11期10卷 1636-1641页

作者： Cheng peng zhi LI Xiao-min SUN Department of Chemistry Tongji University Shanghai 200092 China College of Water Conservancy Changsha Science and Technology University Changsha 410114 China The Environment Research Institute of Shandong University Jinan 250100 China

The aim of this study was to understand and characterize the adsorption of small alkanes, namely methane, ethane and propane, in zeolite TON through detailed Monte Carlo simulations. The isotherms of pure components were calculated and showed good agreement with experimental data. The adsorption positions, adsorption energy of pure components and isotherms of mixtures were also simulated and the results are discussed.

关键词： Monte Carlo simulations Zeolite Adsorption

Microstructures and Mechanical Properties of Mg–xAl–1Sn–0.3Mn(x=1,3,5)Alloy Sheets

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1217-1225页

作者： Chao-Yue Zhao Xian-Hua Chen peng peng Teng tu Andrej Atrens Fu-Sheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400045China School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQLD 4072Australia

The influence of Al alloying on the microstructures and the mechanical properties of Mg–x Al–1 Sn–0.3 Mn alloy sheets was investigated. The microstructure of Mg– x Al–1 Sn–0.3 Mn consisted of α-Mg and Mg 17 Al 12 precipitates. Alloying with Al increased the amount of Mg17Al12 and the average grain size. Uniaxial tensile tests were carried out along the extrusion direction(ED), the transverse direction(TD) and 45° toward the ED. Mg–5 Al–1 Sn–0.3 Mn alloy sheet exhibited the best combination of mechanical properties along the ED: a yield strength of 142 MPa, an ultimate tensile strength of 282 MPa and an elongation of 23%. The good performance of Mg–5 Al–1 Sn–0.3 Mn sheet was mainly attributed to the large quantity of Mg17Al12 precipitates and a weak basal texture. Annealing caused static dynamic recrystallization, refined the grain size and enhanced the mechanical properties: yield strength of 186 MPa, ultimate tensile strength of 304 MPa, elongation of 21% along ED. Both strength and ductility were enhanced by Al alloying.

关键词： Mg–xAl–1Sn–0.3Mn alloys Extrusion Microstructure Mechanical properties

A hardware/software co-optimization approach for embedded software of MP3 decoder

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) 2007年第1期8卷 42-49页

作者： ZHANG Wei LIU peng ZHAI zhi-bo Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

In order to improve the efficiency of embedded software running on processor core, this paper proposes a hard-ware/software co-optimization approach for embedded software from the system point of view. The proposed stepwise methods aim at exploiting the structure and the resources of the processor as much as possible for software algorithm optimization. To achieve low memory usage and low frequency need for the same performance, this co-optimization approach was used to optimize embedded software of MP3 decoder based on a 16-bit fixed-point DSP core. After the optimization, the results of decoding 128 kbps, 44.1 kHz stereo MP3 on DSP evaluation platform need 45.9 MIPS and 20.4 kbytes memory space. The optimization rate achieves 65.6% for memory and 49.6% for frequency respectively compared with the results by compiler using floating-point computation. The experimental result indicates the availability of the hardware/software co-optimization approach depending on the algorithm and architecture.

关键词： Hardware/software co-optimization DSP Embedded software MP3 decoder

Task Offloading and Trajectory Optimization in UAV Networks:A Deep Reinforcement Learning Method Based on SAC and A-Star

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第11期141卷 1243-1273页

作者： Jianhua Liu peng Xie Jiajia Liu Xiaoguang tu Institute of Electronics and Electrical Engineering Civil Aviation Flight University of ChinaDeyang618307China

In mobile edge computing,unmanned aerial vehicles(UAVs)equipped with computing servers have emerged as a promising solution due to their exceptional attributes of high mobility,flexibility,rapid deployment,and terrain *** attributes enable UAVs to reach designated areas,thereby addressing temporary computing swiftly in scenarios where ground-based servers are overloaded or ***,the inherent broadcast nature of line-of-sight transmission methods employed by UAVs renders them vulnerable to eavesdropping ***,there are often obstacles that affect flight safety in real UAV operation areas,and collisions between UAVs may also *** solve these problems,we propose an innovative A*SAC deep reinforcement learning algorithm,which seamlessly integrates the benefits of Soft Actor-Critic(SAC)and A*(A-Star)*** algorithm jointly optimizes the hovering position and task offloading proportion of the UAV through a task offloading ***,our algorithm incorporates a path-planning function that identifies the most energy-efficient route for the UAV to reach its optimal hovering *** approach not only reduces the flight energy consumption of the UAV but also lowers overall energy consumption,thereby optimizing system-level energy *** simulation results demonstrate that,compared to other algorithms,our approach achieves superior system ***,it exhibits an average improvement of 13.18%in terms of different computing task sizes,25.61%higher on average in terms of the power of electromagnetic wave interference intrusion into UAVs emitted by different auxiliary UAVs,and 35.78%higher on average in terms of the maximum computing frequency of different auxiliary *** for path planning,the simulation results indicate that our algorithm is capable of determining the optimal collision-avoidance path for each auxiliary UAV,enabling them to safely reach their designated endpoints in div

关键词： Mobile edge computing SAC communication security A-Star UAV

High-fidelity quantum memory realized via Wigner crystals of polar molecules

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 B 2012年第1期21卷 91-100页

作者： Xue peng Wu Jian-zhi Department of Physics Southeast UniversityNanjing 211189China

The collective excitations of spin states of an ensemble of polar molecules are studied as a candidate for high- fidelity quantum memory. To avoid the collisional properties of the molecules, they are arranged in dipolar crystals under one or two dimensional trapping conditions. We calculate the lifetime of the quantum memory by identifying the dominant decoherence mechanisms and estimating their effects on gate operations when a molecular ensemble qubit is transferred to a microwave cavity.

关键词： polar molecules quantum memory molecular dipolar crystals

Embryonic liver fordin is involved in glucose glycolysis of hepatic stellate cell by regulating PI3K/Akt signaling

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第38期22卷 8519-8527页

作者： Wei tu Jin Ye zhi-Jun Wang Department of Gastroenterology Tongji HospitalTongji Medical College Huazhong University of Science and Technology Institute of Liver Diseases Tongji HospitalTongji Medical College Huazhong University of Science and Technology Department of Gastroenterology Union HospitalTongji Medical College Huazhong University of Science and Technology Institute of Liver Diseases Union HospitalTongji Medical College Huazhong University of Science and Technology

AIM To investigate the role of embryonic liver fordin(ELF) in liver fibrosis by regulating hepatic stellate cells(HSCs) glucose *** The expression of ELF and the glucose glycolysisrelated proteins were evaluated in activated HSCs. si RNA was used to silence ELF expression in activated HSCs in vitro and the subsequent changes in PI3K/Akt signaling and glucose glycolysis-related proteins were *** The expression of ELF increased remarkably in HSCs of the fibrosis mouse model and HSCs that were cultured for 3 wk in vitro. Glucose glycolysis-related proteins showed an obvious increase in the activated HSCs, such as phosphofructokinase, platelet and glucose transporter 1. ELF-si RNA, which perfectly silenced the expression of ELF in activated HSCs, led to the induction of glucose glycolysis-related proteins and extracellular matrix(ECM) components. Moreover, p Akt, which is an important downstream factor in PI3K/Akt signaling, showed a significant change in response to the ELF silencing. The expression of glucose glycolysisrelated proteins and ECM components decreased remarkably when the PI3K/Akt signaling was blocked by Ly294002 in the activated HSCs. CONCLUSION ELF is involved in HSC glucose glycolysis by regulating PI3K/Akt signaling.

关键词： Liver fibrosis Embryonic liver fordin PI3K/ Akt signaling Hepatic stellate cells Glucose glycolysis

Multifunctional application of nonlinear metamaterial with two-dimensional bandgap

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(Technological Sciences) 2023年第3期66卷 869-880页

作者： CHEN KangKang tu GuoWei DONG XingJian HUANGFU YiFan peng zhiKe State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Department of Civil and Environmental Engineering University of MichiganAnn ArborMI 48109USA School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

Mechanical metamaterials with low-frequency and broadband bandgaps have great potential for elastic wave *** by the ancient window mullions,a novel plate-type metamaterial with a two-dimensional bandgap is *** on the local resonance mechanism,the broadband low-frequency in-plane and out-of-plane bandgaps on the designed structure are *** bandgaps can be adjusted by the mass re-distribution of the main-slave resonators,the stiffness design of the support beam,and the adjustment of the excitation amplitude.A semi-analytical method is proposed to calculate the in-plane and out-of-plane bandgaps and the corresponding wave attenuation characteristics of the infinite periodic *** explored how mass re-distribution,stiffness changes,and geometric nonlinearity influence the ***,to verify the conclusions,we fabricated a finite periodic structure and obtained its wave transmission characteristics both numerically and ***,the designed metamaterial is applied to the waveguide control,elastic wave imaging,and vibration *** study may provide new ideas for structural design and engineering applications of mechanical metamaterials.

关键词： mechanical metamaterial two-dimensional bandgap geometric nonlinearity waveguide control vibration isolation