检索结果-南通市图书馆

MULTIPLE TRELLIS CODED ORTHOGONAL TRANSMIT SCHEME FOR MULTIPLE ANTENNA SYSTEMS

Journal of Electronics(China) 2006年第3期23卷 355-360页

作者： lv Shujuan wei guo Zhu Jinkang Personal Communications Network ＆ Spread Spectrum Lab Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 China

In this paper, a novel multiple trellis coded orthogonal transmit scheme is proposed to exploit transmit diversity in fading channels. In this scheme, a unique vector from a set of orthogonal vectors is assigned to each transmit antenna. Each of the output symbols from the multiple trellis encoder is multiplied with one of these orthogonal vectors and transmitted from corresponding transmit antennas. By correlating with corresponding orthogonal vectors, the receiver separates symbols transmitted from different transmit antennas. This scheme can be adopted in coherent/differential systems with any number of transmit antennas. It is shown that the proposed scheme encompasses the conventional trellis coded unitary space-time modulation based on the optimal cyclic group codes as a special case. We also propose two better designs over the conventional trellis coded unitary space-time modulation. The first design uses 8 Phase Shift Keying （8-PSK） constellations instead of 16 Phase Shift Keying （16-PSK） constellations in the conventional trellis coded unitary space-time modulation. As a result, the product distance of this new design is much larger than that of the conventional trellis coded unitary space-time modulation. The second design introduces constellations with multiple levels of amplitudes into the design of the multiple trellis coded orthogonal transmit scheme. For both designs, simulations show that multiple trellis coded orthogonal transmit schemes can achieve better performance than the conventional trellis coded unitarv space-time schemes.

关键词： Space-time Trellis Code Modulation (TCM) Multiple TCM (MTCM) Differential Unitary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical study of dispersion characteristics of dipole flexural waves in a cased hole with different cement conditions

引用

Applied Geophysics 2022年第1期19卷 29-40,143,144页

作者： Yang Meng-En lv wei-guo Wu Yang Cui Zhi-Wen Liu Jin-Xia College of Physics Jilin UniversityChangchun 130021China

Crossed-dipole acoustic logging technology is mainly used to measure shear wave and determine the anisotropy or fractures of formation in the fi eld of acoustic *** on the propagation characteristics of dipole flexural waves in cased holes,and the wavefi eld of fundamental flexural mode at three bonding conditions:good cement bonding,poorly bonded interface I,and poorly bonded interface *** dispersion curves of flexural waves are calculated,and the eff ects of cement parameters(elastic parameters and geometric dimensions)on dispersion curves are *** RAI method is used to calculate the dipole full waveforms in a cased hole with conventional or ultralight cement surrounded by a soft ***,the weighted spectral semblance is used to conduct the dispersion analysis of the full *** numerical results show that the cutoff frequency of flexural waves exceeds the frequency band of the current dipole logging tools in the well-bonded cased hole with conventional cement in soft ***,when ultralight cement is used,the cutoff frequency shifts toward low values,and the ultralight cement bonding is conducive to measuring flexural waves in soft *** interface I is poorly bonded,the cutoff frequency shifts toward low values,and the change is evident in soft *** cutoff frequency in the case of ultralight cement bonding is more evident than that of conventional cement *** only interface II is poorly bonded,regardless of the cement used,the cutoff frequencies are all below 2 *** dipole full-wave analysis of diff erent bonding conditions further illustrates that the dispersion characteristics of flexural waves are sensitive to the cement bonding quality of cased holes.

关键词： Soft formation cased borehole flexural wave ultralight cement dispersion analysis cement bonding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

江苏省制造业产业集群及其空间集聚特征

引用

经济地理 2009年第10期29卷 1677-1684页

作者：吕卫国陈雯中国科学院南京地理与湖泊研究所中国江苏南京210008 中国科学院研究生院中国北京100039

空间集聚是产业集群固有特征,也是产业集群识别和分析的核心。采用Ellison和Glaeser1997设计的产业集聚指数和产业间共同集聚指数,重点对江苏省5个典型的制造业产业集群的空间集聚特征进行了分析。结果表明,5个典型的制造业产业集群均... 详细信息

空间集聚是产业集群固有特征,也是产业集群识别和分析的核心。采用Ellison和Glaeser1997设计的产业集聚指数和产业间共同集聚指数,重点对江苏省5个典型的制造业产业集群的空间集聚特征进行了分析。结果表明,5个典型的制造业产业集群均存在明显的产业集聚和产业间共同集聚。通过比较县域和市域两个尺度下的产业集聚和产业间共同集聚特征,发现,各集群空间集聚范围有一定差异,钢铁、机械装备制造集群、石油、化学加工集群和汽车制造集群的空间集聚范围明显超越县域在市域,电子、通讯制造集群集聚范围在县域和市域尺度同时存在,而棉毛纺织服装制造集群集聚范围主要在县域。还发现,各集群的集聚程度也存在差异,电子、通讯制造集群无论是产业内还是产业间集聚程度最高,达高集聚水平,表明电子、通讯制造集群内外部性很高,集群内企业具有很强的相互吸引作用。汽车制造集群集聚程度较低,其他集群集聚程度为中等水平。

关键词：制造业产业集群空间集聚主成份分析法共同集聚指数江苏省

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

丝裂原活化的蛋白激酶:一个治疗病理性痛潜在的药物新靶点

引用

中国药理学通报 2009年第7期25卷 848-851页

作者：张颜波吕国蔚泰山医学院附属医院神经内科山东泰山271000 首都医科大学低氧医学研究所北京100069

病理性痛(pathological pain)是临床上常见的疼痛,通常分为炎性痛(inflammatory pain)和神经病理性痛(neuro-pathic pain),具有痛觉过敏和痛觉异常等疼痛神经可塑性特点;丝裂原活化的蛋白激酶(mitogen-activated proteins kinases,MAPKs)作为一种关键细胞信号分子,包括细胞外信号调节激酶(ERK)、p38和c-Jun氨基末端激酶(JNK)3条主要激活通路,在病理性痛觉信号转导和神经可塑性调控中起重要作用。在不同动物模型中,抑制MAPKs信号通路,可明显减轻炎症痛和神经病理性痛,这为MAPKs抑制剂开发成为治疗病理性痛的药物提供了可能,MAPKs已成为治疗病理性痛药物作用的一个重要的潜在的靶点。

关键词： MAPKs 病理性痛炎症痛神经病理性痛 MAPKs抑制剂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A mild, configurable, flexible CoNi-LDH（v）/Zn battery based on H-vacancy-induced reversible Zn2+ intercalation

引用

Journal of Energy Chemistry 2025年第1期100卷 498-508页

作者： Xinyue Cheng Dingsheng Wu Hao Gao Qingqing Wang Pengfei lv Sam S.Yoon Qufu wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University School of Mechanical Engineering Korea University

Flexible Zn-based batteries have attracted increasing research interest as essential components of wearable energy storage ***,the advancement of flexible aqueous Zn-based batteries based on Co-Ni layered double hydroxide （CoNi-LDH） as the cathode material is hampered by their poor cycling stability and the corrosiveness of alkaline ***,CoNi-LDH nanosheets enriched with H vacancies (CoNi-LDH（v）) were constructed on a flexible carbon cloth （CC） substrate via electrochemical deposition and *** Zn-based battery comprising CoNi-LDH（v）@CC as the cathode exhibited highly reversible conversion reactions and stable operation in 3 M ZnSO4electrolyte （pH=4）.The battery delivered an excellent specific capacity (225 mA h g-1,0.26 mA h cm-2),acceptable cycling stability（53.9%,900 cycles）,and high discharging *** abundant H vacancies served as active sites for the reversible intercalation of Zn2+and the extravasation of NO3-generated channels and space for Zn2+transport and storage,together enabling an excellent Zn2+storage ***,a sandwich-structured solid-state CoNi-LDH（v）@CC//Zn@CC battery was fabricated and was found to exhibit a noteworthy electrochemical performance and mechanical *** a proof of concept,the unencapsulated battery powered a digital watch under various deformation conditions and operated stably for 80 ***,the flexible battery displayed outstanding customizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** proposed engineering strategy contributes to the realization of textiles with truly wearable energy-storage devices.

关键词： CoNi/Zn battery H vacancies Mild aqueous electrolyte Tailorable battery Wearable energy storage device

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

大数据中边界向量调节熵函数支持向量机研究

引用

微电子学与计算机 2016年第8期33卷 149-152,157页

作者：林蔚刘婷吕伟国哈尔滨工程大学理学院黑龙江哈尔滨150001

当训练集的规模很大时,一般的支持向量机的学习过程需要占用大量的内存,寻优速度缓慢,不利于实际应用.提出了一种预抽取支持向量的支持向量机调节熵函数法.首先,利用两凸包相对边界向量方法预抽取出边界向量;然后,利用支持向量机调节熵... 详细信息

当训练集的规模很大时,一般的支持向量机的学习过程需要占用大量的内存,寻优速度缓慢,不利于实际应用.提出了一种预抽取支持向量的支持向量机调节熵函数法.首先,利用两凸包相对边界向量方法预抽取出边界向量;然后,利用支持向量机调节熵函数法来训练预抽取的边界向量.实验表明,采用这种方法来训练样本集不仅降低了学习的代价,还提高了分类速度.

关键词：数据挖掘支持向量机调节熵函数预抽取支持向量

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent progress in constructing fluorinated solid-electrolyte interphases for stable lithium metal anodes

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 270-291页

作者： Di Zhang Pengfei lv wei Qin Xin He Yuanhua He Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province College of Civil Aviation Safety EngineeringCivil Aviation Flight University of ChinaGuanghan 618307China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Lithium metal batteries(LMBs)are emerging as a promising energy storage solution owing to their high energy density and specific ***,the non-uniform plating of lithium and the potential rupture of the solid-electrolyte interphase(SEI)during extended cycling use may result in dendrite growth,which can penetrate the separator and pose significant short-circuit *** a stable SEI is essential for the long-term operation of the ***-rich SEI has garnered significant attention for its ability to effectively passivate electrodes,regulate lithium deposition,and inhibit electrolyte *** the structural components and preparation methods of existing fluorinated SEI is crucial for optimizing lithium metal anode *** paper reviews the research on optimizing LiF passivation interfaces to protect lithium metal *** focuses on four types of compositions in fluorinated SEI that work synergistically to enhance SEI *** instance,combining compounds with LiF can further enhance the mechanical strength and ionic conductivity of the *** metals with LiF significantly improves electrochemical performance at the SEI/anode interface,with a necessary focus on reducing electron tunneling ***,incorporating polymers with LiF offers balanced improvements in interfacial toughness and ionic conductivity,though maintaining structural stability over long cycles remains a critical area for future *** alloys combined with LiF increase surface energy and lithium affinity,challenges such as dendrite growth and volume expansion *** summary,this paper emphasizes the crucial role of interfacial structures in LMBs and offers comprehensive guidance for future design and development efforts in battery technology.

关键词： LiF lithium metal anodes solid-electrolyte interphase interface cycling stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of Micromechanical Properties at the Interface of Pre-wet SBS Modified Asphalt Mixture Based on Molecular Simulation Technology

引用

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 103-113页

作者： CHEN Wuxing CHEN Shuang YU Yan ZHANG Jiangyi XU Haiyang guo wei School of Mines China University of Mining and TechnologyXuzhou 221000China College of Construction Engineering Jilin Uni-versityChangchun 130026China

The pre-wetting of aggregate surface is a means to improve the interface performance of SBS modified asphalt and *** effect of pre-wetting technology on the interaction between SBS modified asphalt and aggregate was analyzed by molecular dynamics *** diffusion coefficient and concentration distribution of SBS modified asphalt on aggregate surface are *** simulation results show that the diffusion coefficient of the aggregate surface of SBS modified asphalt is increased by 47.6%and 70.5%respectively after 110#asphalt and 130#asphalt are *** concentration distribution of SBS modified asphalt on the aggregate surface after pre-wetting is more *** to the results of interface energy calculation,the interface energy of SBS modified bitumen and aggregate can be increased by about 5%after *** to the results of molecular dynamics simulation,the pre-wetting technology can effectively improve the interface workability of SBS modified bitumen and aggregate,so as to improve the interface performance.

关键词： pre-wet oil-stone interface interface interaction interface mechanics molecular dynamics simulation

来源：

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

A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

引用

Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian guo Kunpeng Li wei Yue Nam‑Young Kim Yang Li guozhen Shen Jong‑Chul Lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency Integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State Key Laboratory of Integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

三峡电站技术供水系统优化

引用

华东电力 2010年第8期38卷 1188-1191页

作者：孙亚涛吕卫国三峡水力发电厂湖北宜昌443133

通过对技术供水系统二级减压优化、流量优化、正反向倒换优化解决了技术供水系统运行中出现的问题,确保了技术供水系统安全稳定高效运行。

关键词：技术供水系统二级减压减压比正反向优化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：