TD-LTE／TD-LTE-Advanced技术

作为TD—SCDMA技术的演进。TD—LTE／TD—LTE-Advanced是下一代移动通信系统IMT-Advanced的主流候选技术之一。与第三代移动通信系统采用CDMA技术不同,TD—LTE采用OFDM和MIMO作为基本技术,大量采用了目前移动通信领域最先进的技术和设计理念。本文介绍了TD—LTE／TD—LTE—Advanced技术的标准化进程、技术特点以及系统性能评估情况。     

双-(反-4′-烷基环己烷羧酸)-2,3-二氯-1,4-苯二酯类液晶的合成

合成了双—（反—４—烷基环己烷羧酸）—２，３—二氯—１，４—苯二酯，烷基分别为ｎ－Ｃ６Ｈ１３、ｎ－Ｃ７Ｈ１５、ｎ－Ｃ８Ｈ１７。测定了这些化合物的液晶相变温度，并通过磁场法测定了介电各向异性，Δε均为负值。     

无铅Sn—Ag—Sb与Sn—Zn—In润湿性研究

通过实验测定Sn—Ag—Sb及Sn—Zn—In系列合金的润湿角，进行了润湿性研究，发现Sn—Ag—Sb及Sn—Zn—In系焊料存在润湿性差的缺点，通过添加低表面张力的金属或稀土元素可在一定程度上降低润湿角，能提高润湿性。     

表面波声—电—光效应及其在光信号处理中的应用

本文综述了国外表面波声—电—光效应和器件的发展。叙述了表面波声—电—光效应的基本概念、信号处理功能以及它在光信息处理中的应用。     

第三代高频自动链路建立协议分析及仿真

随着现代军用通信网络的发展与进步，第三代高频自动链路建立协议(Third-generation HF Automatic Link Establishment)将逐渐取代现有的第二代协议。首先从CSMA机制、Dwell—Groups技术、Multi—Slot技术等方面概略地介绍了3G-ALE技术。然后在同步工作模式下，将Dwell—Groups技术、Multi—Slot技术应用在协议当中进行了对比仿真，并分析了Dwell—Groups技术、Multi—Slot技术对3G-ALE系统性能的影响。     

ADSP-TS201在TD-SCDMA基站中的应用

介绍了TD—SCDMA的帧结构、基站的上下行处理，以及ADSP-TS201DSP芯片的结构和特点。结合ADSP—TS201的结构和特点，给出了基于ADSP—TS201的TD—SCDMA基站的基带信号处理的实现方案。     

TD-SCDMA网络Iu-PS口监测技术的研究

对TD—SCDMA网络中Iu—PS口基本概念和功能进行了介绍,提出了一种Iu—PS口的监测方案,将Iu—PS口的监测分为解码、合成和统计3大模块。在此基础上分析了Iu—PS口关键协议RANAP协议、GMM协议、SM协议的解码方法,Iu—PS口上的全局CDR和子业务CDR的合成技术以及基于合成的各统计指标的统计方法等,解决了Iu—PS口测试过程中的一些技术难题。本方案已应用到TD—SCDMA网络测试仪和TD—SCDMA监测系统中,通过现网测试,效果良好。     

TD—LTE系统Reed—Muller译码的仿真及FPGA实现

主要基于FPGA实现TD—LTE系统中的Reed—Muller译码,包括Reed—Muller译码的介绍、方案的构成、FPGA实现流程、以及实现结果分析。并在Virtex-6芯片上,进行了仿真、综合、板级验证。实现结果表明,该Reed—Muller译码算法应用到TD—LTE射频一致性测试仪表中具有良好的高效性和可靠性。     

TD-SCDMA专题——TD-SCDMA网络及未来发展展望

近两年来,随着TD—SCDMA试商用网络的建设,TD—SCDMA产业链逐步完善,TD—SCDMA组网技术逐渐走向成熟。本文描述了TD—SCDMA的主要关键技术特点,重点分析了在网络建设实践中首次提出并应用的主要技术创新,最后对于TD—SCDMA未来发展提出了作者的一些建议。     

TD—SCDMA所开辟的移动通信新航线的未来发展战略探讨

文章首先指出了TD—SCDMA发展的路线轨迹,并提出了发展TD—SCDMA的策略,从网络、终端、应用和资费等方面进行了分析,文章同时指出了TD—LTEAdvanced面临的挑战并给出了三点建议,最后给出了TD—SCDMA在全球市场要扩大阵容三分天下的建议。     

基于区块链技术的高校信息化建设研究

区块链技术具有去中心化、安全高效、不可篡改等特征,与高校信息化建设中的独立性和科学化要求相吻合。高校在信息化建设中,可借助区块链这一优势,对数据管理等工作进行有效管理,实现信息化建设目标。但在信息化建设中,高校显现出规章制度不完善、应用生态不成熟、监管机制不健全、法律法规不完善、区块链人才紧缺等问题,影响了高校信息化建设的革新进程。基于此,高校可从区块链技术的优势入手,从规章制度、生态体系、监管体系、法律法规、人才体系等方面探寻新的发展思路。     

浅谈广播电视台多功能移动直播车的建设

近年来,随着广播电视产业的多元化快速发展,重大活动越来越多,对广播、电视、网络的直播方式、影响力都有更高的要求,直播车的功能和用途得到广泛的延伸和扩展.首先介绍了直播车建设背景及目标,然后从车体改装、供配电系统、音频系统、视频系统、新媒体系统及传输系统等多个方面,阐述了新余市广播电视台多功能移动直播车的建设.     

Electrical Machines and Drives for Electric, Hybrid, and Fuel Cell Vehicles

This paper reviews the relative merits of induction, switched reluctance, and permanent-magnet (PM) brushless machines and drives for application in electric, hybrid, and fuel cell vehicles, with particular emphasis on PM brushless machines. The basic operational characteristics and design requirements, viz. a high torque/power density, high efficiency over a wide operating range, and a high maximum speed capability, as well as the latest developments, are described. Permanent-magnet brushless dc and ac machines and drives are compared in terms of their constant torque and constant power capabilities, and various PM machine topologies and their performance are reviewed. Finally, methods for enhancing the PM excitation torque and reluctance torque components and, thereby, improving the torque and power capability, are described     

模拟微电子及应用技术前沿研究进展

我们所处的物理世界是模拟的。在现代信息与通信技术(ICT)、计算系统中,模拟电子的作用包括物理世界感应与交互、计算、控制、数据转换、通信、供电和测量等环节。以模拟集成电路为主体的模拟微电子器件是当今几乎所有以数字为中心的系统中的关键组件,对未来信息技术的发展至关重要。为了实现以5G、6G通信为代表的新一代ICT、工业4.0、物联网等信息社会的基础设施建设目标,其首要和必要条件是通过模拟硬件取得根本性突破,实现物理世界与机器交互的智能感知、认知和处理。为此要求模拟电子器件技术在无线信号链集成电路、计算范式与架构、高精度感知控制,以及模拟微电子技术的设计、工艺和封装测试技术、特定应用等方面开展研究,解决诸如计算范式与架构创新、压缩感知、新架构创新所需的工艺技术、毫米波和太赫兹等高频段集成电路开发所带来的各种挑战。文章从无线信号链集成电路、边缘机器学习中的模拟技术、高精度感知与控制、重要工艺创新等方面探讨了模拟微电子及应用技术前沿的最近研究进展,显示了未来模拟电子技术的关键发展趋势。     

Wave propagation and scattering in random media and rough surfaces

The author presents a comprehensive review highlighting historical as well as new developments in the area of random media. Both discrete and continuous media are considered as well as rough surfaces. The author discusses wave propagation in turbulence and in a random continuum where the refractive index is a random function of space and time. Examples are optical propagation in the atmosphere, microwaves in the troposphere, ionosphere, planetary atmosphere, and solar wind, and acoustic scattering in ocean turbulence. The author describes multiple scattering by random distributions of discrete scatterers. Examples are optical and microwave scattering by rain, fog, smog, snow, ice particles, and vegetation, optical and ultrasound scattering by tissues and blood, optical and acoustic scattering in the ocean, and scattering in composite materials. Scattering by rough surfaces and interfaces is discussed. Examples are acoustic scattering by ocean surfaces, microwave and optical scattering by vegetation, terrain, and snow cover, and ultrasound scattering by rough interfaces in biological media     

Progress in ZnO materials and devices

ZnO is a wide-band-gap semiconductor material that is now being developed for many applications, including ultraviolet (UV) light-emitting diodes, UV photodetectors, transparent thin-film transistors, and gas sensors. It can be grown as boules, as thin films, or as nanostructures of many types and shapes. However, as with any useful semiconductor material, its electrical and optical properties are controlled by impurities and defects. Here, we consider various important donor-type impurities, such as H, Al, Ga, and In, and acceptor-type impurities, such as N, P, As, and Sb. We also examine the effects of a few common point defects, including Zn interstitials, Zn vacancies, O vacancies, and complexes of each. The main experimental techniques of interest here include temperature-dependent Hall-effect and low-temperature photoluminescence measurements, because they alone can provide donor and acceptor concentrations and donor energies. The important topic of p-type ZnO is also considered in some detail.     

空基激光通信研究进展和趋势以及关键技术

激光通信以其带宽大、保密性好、无频谱限制等特点成为构建空天地海全域网络高速通信有效技术途径。相较天基而言,搭载在气球、飞艇、无人机、飞机等平台的空基激光通信系统以其灵活性好、成本低、可维修等特点,成为高保密军用战术网络、救灾应急网络、商用低成本网络的首选。详细介绍了美国、德国、法国、中国等空基激光通信技术最新研究进展和主要项目的参数指标,总结了一对多、轻量化、高带宽等发展趋势和面临的大气信道复杂、背景噪声严重等技术挑战,提出了高动态捕跟、高密度集成、高灵敏度接收等关键技术措施,为空基激光通信技术研究和工程项目研制提供参考。     

Living Cell-Derived Intelligent Nanobots for Precision Oncotherapy

The progress of precision oncology medicine is always limited by the tumor off-targeting, the drug side effects, and the treatment inefficiency due to the complex and ever-changing tumor microenvironment. Living cells, such as blood cells and immune cells, exhibit natural tumor tropism, controllable physicochemical modification, and excellent biocompatibility, which provide an advantageous pathway for innovative and efficient tumor suppression. Armed with nanoengineering techniques, artificial living cells harness their inherent biological properties to precisely identify and eradicate tumors, demonstrating broad biological application prospects and great transformational potential in personalized cancer therapy. Here, the recent advances of living cell-based bionanobots including platelets, red blood cells, neutrophil, macrophage, and CAR-T cells for cancer precision therapy and immune regulation are summarized, and the efficient anti-tumor strategies for engineering living cell nanorobots to overcome complex biological barriers and immune suppression are also outlined (e.g., immunotherapy, sonodynamic therapy, chemo/radiotherapy, and phototherapy). In addition, the study discusses the advantages, limitations, and current challenges of artificial living cell-based drug delivery systems, and provide perspectives on the future development of living cell-mediated precision tumor nanomedicine.     

基于AT89S52的水情遥测终端设计与实现

设计了一种基于单片机的低功耗水情遥测终端,实现多种水情数据的采集、处理和报送。终端采用AT89S52单片机作为硬件核心,由扩充存储器、实时时钟、键盘输入、液晶显示、串行通信、调制解调及太阳能供电等外围电路构成。同时具备数字和模拟数据采集接口,通过连接相应传感器,实时采集雨量、水位、闸位、流量、温度等信息,使遥测参数多样化。显示模块与按键配合,用于动态显示、设置参数及系统的检测维护。设计的RS-232通信接口,可连接SMS/GSM、GPRS、无线电台等通信模块,满足不同通信方式下的应用,提高了通用性。该终端在实际应用中亦能稳定可靠地工作,满足水情遥测的功能和性能等技术要求。     

Service characterization for cost/benefit optimization of?enhanced?UMTS

In this paper an all-IP Enhanced-Universal Mobile Telecommunications System (E-UMTS) is considered, where enhancements include link level behavior, high-speed downlink packet access (HSDPA) channel, resource management, Diffserv architecture, and Radio Resource Management schemes. An overview of E-UMTS deployment scenarios and service needs is presented based on the views of relevant players. Deployment and mobility scenarios are considered, including expected population density and usage of service mix for three environments, namely offices, urban/vehicular, and business city center. In addition, based on population and service penetration values, E-UMTS traffic generation and activity models are described and characterized. Based on these scenarios and characterizations, system level simulations are carried out and the enhanced service quality performance is demonstrated, including blocking probability, handover failure probability and end-to-end delay in each deployment scenario. By using system level simulations, services and environmental conditions can be mapped into deployment strategies (and supported system capacity) whose evaluation is essential prior to field trials and real implementation. On the one hand, costs depend on the prices of the spectrum, equipment, operation and maintenance, as well as on the number of cells which, in turn, depends on the cell radius. On the other, revenues depend on the price per MB and on the supported throughput. As the goal of operators and service providers is to maximize the profit, the profit in percentage was obtained for the three considered scenarios. Its optimum values are found for cell radii around 31, 257, and 310 m for offices, vehicular and business city center scenarios, respectively.