变电站防误闭锁系统的应用现状

对防误闭锁方式的优缺点及防误闭锁系统的现状及发展等进行分析研究,提出电力企业的防误操作对策。     

大学英语阅读与写作教学评价量规的制定与应用

评价量规已经成为语言教学评价中一种有效的工具,它有助于帮助教师向学生阐明学习目标和任务,并向学生提供有效的反馈信息.本文着重介绍了大学英语教学中阅读和写作的评价量规的制定,并阐述了在制定量规时应该遵守的原则.     

高响应度GaN肖特基势垒紫外探测器的性能与分析

制作了反向饱和电流为5.5×10-14 A/cm2,势垒高度为1.18eV的GaN肖特基势垒紫外探测器.测量了探测器分别在零偏压及反向偏压下的光谱响应度,响应度随反向偏压无显著变化,零偏压下峰值响应度在波长358.2nm处达到了0.214A/W.利用波长359nm光束横向扫描探测器的光敏面,测量了探测器在不同偏压下的空间响应均匀性,相应偏压下的光响应在光敏面中央范围内响应幅值变化不超过0.6%.光子能量在禁带边沿附近的光束照射下,GaN肖特基势垒紫外探测器存在势垒高度显著降低现象,这种现象在肖特基透明电极边沿及其压焊电极附近表现得更为突出.探测器在368和810nm波长光一起照射时的开路电压比只有368nm光照射时的开路电压大,而零偏压下两者的光电流近似相等.利用这种开路电压变化效应估算了探测器在368nm光照射下,表面被俘获空穴的面密度变化量约为8.4×1010 cm-2.     

电信云的兴起(英文)

Cloud computing is the latest major evolution in computing technology.The convergence between cloud computing and telecom networks could significantly reduce costs and bring new business opportunities for operators.Currently,traditional telecom operators are embarrassed by the fact that the increase in revenue cannot catch up with the quick growth of users and the expansion of networks.With the introduction of the cloud computing technology,operators can virtualize the network functions through low-cost COTS IT hardware.All kinds of existing services can be cloudified and thus obtain the benefits of statistical multiplexing among IT resources.With the Telco Cloud architecture,operators can manage both IT infrastructures and network resources intelligently in order to adapt to the dynamic demands from the application and to establish open platforms for developing new services.     

光缆接续损耗的工程控制

本从影响光纤损耗的主要因素分析着手，提出了光缆接续损耗工程控制的简洁有效的方法。     

牛磺酸对顺铂导致培养的原代兔肾小管细胞损伤的保护作用

目的：研究牛磺酸对顺铂导致培养的原代兔肾近端小管细胞(PTC)损伤的保护作用。方法：在体外建立原代兔肾近端小管细胞培养。采用溴乙锭荧光法测量DNA链间交联和Fur-2／AM测量细胞内游离钙离子浓度。首先将牛磺酸(0．1，1，10g．L^-1)与PTC保温24小时,然后，加入顺铂使其终浓度达到26μmol.L^-1,再继续保温24小时。顺铂损伤组同样培养48小时。前24小时不加入牛磺酸和顺铂,后24小时加入顺铂使其终浓度为26μmol.L^-1。对照组不加入牛磺酸和顺铂，同样培养48小时。结果：顺铂导致损伤组形成DNA链间交联和细胞内游离钙离子浓度升高．牛磺酸1．10g．L^-1可明显降低DNA链间交联和细胞内游离钙离子浓度。结论：牛磺酸可保护顺铂对PTC的损伤。     

Block-Orthogonal Frequency Division Multiplexing in Multi-Path Fading Channel

Orthogonal frequency division multiplexing (OFDM) is robust against multi-path interference due to using a lot of low symbol rate sub-carriers. In order to mitigate the degradation due to multi-path interference, guard time interval (GI) is inserted into each OFDM symbol. However, redundant allocation to GI leads to loss of effective transmission power. We propose the Block-OFDM which can reduce the GI overhead ratio per frame compared with conventional OFDM. In Block-OFDM system frequency domain equalization (FDE) is carried out in order to remove multi-path interference. We evaluated Block-OFDM performance in a frequency selective fading channel and compared with that of conventional OFDM. Ryohei Kimura received his B.E. and M.S degrees in communications engineering form Tohoku University, Sendai, Japan, in 2001 and 2003, respectively. In 2003, he joined Panasonic Mobile Communications Co., Ltd. His current research interests include such mobile communication technologies as OFDM and MIMO (MLD), and the like. Akiyoshi Monma received his B.E. in communications engineering form Tohoku University, Sendai, Japan, in 1998. In 1998, he joined Panasonic Mobile Communications Sendai R&D Lab. Co., Ltd. His current research interests include such mobile communication technologies as OFDM and PAPR reduction, and the like. Jinsong Duan received his B.E. and M.S. from Changsha Institute of Technology, China in 1987 and 1990. He received his Ph.D. from Osaka City University, Japan in 2000. From 2000–2003 he was with Mitsubishi Electric Corporation, where he engaged in research and development of WCDMA systems. From 2003, he joined Panasonic Mobile Communications Co., Ltd. His current interests include such mobile communication technologies as OFDM, MIMO, link adaptation, scheduling, and TDMA/FDMA/CDMA systems. Mitsuru Uesugi received his B.E. degree from Waseda University in 1986 and received his Ph.D degree from Tohoku University in 2004, respectively. He is a general manager in the Mobile Communication Technology Development Center of Panasonic Mobile Communications Co., Ltd. His current research interests include such mobile communication technologies as equalization, interference cancellation, modulation method, and the like.     

FlexE技术及其在5G承载网中的应用探析

5G对承载网络的带宽、时延、切片、可靠性等方面提出了更高的要求。FlexE技术重用现有IEEE 802.3以太网物理层标准,在MAC层与PCS层中新增Flex Shim层,实现网络灵活性、多速率、刚性接口等特性。其捆绑、通道化、子速率等功能,可以与IP/Ethernet技术良好对接,大力助推5G承载网络的发展,为5G技术的应用提供保障。随着5G产业的不断发展与完善,FlexE技术必将得到广泛的应用。     

RTCWeb及其与IMS的融合研究

RTCWeb是一种实现免插件Web客户端及通信的技术。相比传统应用客户端,RTCWeb客户端操作更加便捷,开发更加灵活,并且能脱离操作系统和平台的限制,其对于业务开发者、网络运营商和终端用户都是一种更好的选择。本文首先对RTCWeb通信模型及关键技术进行了介绍;然后针对RTCWeb和IMS融合提出了构想并给出此构想下的具体解决方案;最后展望了基于IMS的RTCWeb系统的未来演进趋势。     

半绝缘InP中深能级缺陷对电学性质的影响和缺陷的控制

综合深能级缺陷和电学性质的测试结果,证明了半绝缘InP单晶材料的电学性能、热稳定性、均匀性等性能与材料中一些深能级缺陷的含量密切相关.通过分析深能级缺陷产生的规律与热处理及生长条件的关系,给出了抑制缺陷产生,提高材料质量的途径.对缺陷的属性与形成机理进行了分析讨论.