基于因子和聚类分析的全国科普示范县（市、区）科普综合实力评价研究

如何对创建单位进行有效的管理是全国科普示范县(市、区)活动目前面临的问题之一。以2011—2015年全国科普示范县(市、区)为样本,设计评价指标,应用因子分析和聚类分析方法对我国32个省级行政单位的全国科普示范县(市、区)的科普综合实力进行分析,得出基于因子分析的全国科普示范县(市、区)科普综合实力评价体系和基于全国科普示范县(市、区)科普综合实力的分类标准。应用该结论能够对全国科普示范县(市、区)进行评价和分类,为全国科普示范县(市、区)管理提供一种可以量化的参考。     

THE EFFECTIVE RANGE OF K-FAULT DIAGNOSIS OF-LINEAR CIRCUITS

In view of K-fault testability,the topological construction of a practical circuitis far from ideal.In order to improve the testability of a circuit,we may increase the numberof accessible nodes or use the multi-excitation method.Effectiveness of these methods and thefeasibility of choosing accessible nodes are discussed in detail.The conditions for multi-excitationtestability are presented.     

舰船噪声波形结构特征提取及分类研究

本文系统深入地地分析研究了舰船噪声信号的时域波形结构特征,利用舰船器声信号的过零点,峰间幅值,波长差,波列面积分布以及时域特性提取技术,     

Nanostructured Metal Chalcogenides for Energy Storage and Electrocatalysis

Energy storage and conversion technologies are vital to the efficient utilization of sustainable renewable energy sources. Rechargeable lithium‐ion batteries (LIBs) and the emerging sodium‐ion batteries (SIBs) are considered as two of the most promising energy storage devices, and electrocatalysis processes play critical roles in energy conversion techniques that achieve mutual transformation between renewable electricity and chemical energies. It has been demonstrated that nanostructured metal chalcogenides including metal sulfides and metal selenides show great potential for efficient energy storage and conversion due to their unique physicochemical properties. In this feature article, the recent research progress on nanostructured metal sulfides and metal selenides for application in SIBs/LIBs and hydrogen/oxygen electrocatalysis (hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction) is summarized and discussed. The corresponding electrochemical mechanisms, critical issues, and effective strategies towards performance improvement are presented. Finally, the remaining challenges and perspectives for the future development of metal chalcogenides in the energy research field are proposed.     

复合材料超声波直线电机的运动控制

针对复合材料超声直线电机振动体具有两个固有频率的特点，设计了具有频率跟踪特性的超声直线电机驱动器，利用激励信号频率变化改变电机运动方向，实现了超声直线电机的运动控制。     

基于BiCMOS技术的高速数字/模拟转换器

基于BiCMOS技术，进行了高速数字/模拟转换器研究. 以并行输入类型，电流工作模式的16位D/A转换器为载体，进行了电路设计、工艺制作和测试. 在±5.0V工作电压下，测试得到转换速率≥30MSPS，建立时间为50ns，增益误差为±8% FSR，积分非线性误差为1/2 LSB，功耗为500mW.     

信令监测系统共享平台业务订阅模块的设计

针对电信运营商的运营维护的要求,对信令监测系统的技术特点以及功能需求进行了研究,提出了一套信令监测系统共享平台的整体设计方案,对业务信令数据订阅模块的消息字段、通信流程进行了详细的设计,并且编码实现了其功能。测试表明,该业务信令数据订阅模块能够完成第三方平台对信令监测系统业务信令资源列表的查询、业务信令数据的订阅以及信令数据的传送,具有较好的实用价值。     

Pressure‐Tunable Ambipolar Conduction and Hysteresis in Thin Palladium Diselenide Field Effect Transistors

Few‐layer palladium diselenide (PdSe₂) field effect transistors are studied under external stimuli such as electrical and optical fields, electron irradiation, and gas pressure. The ambipolar conduction and hysteresis are observed in the transfer curves of the as‐exfoliated and unprotected PdSe₂ material. The ambipolar conduction and its hysteretic behavior in the air and pure nitrogen environments are tuned. The prevailing p‐type transport observed at atmospheric pressure is reversibly turned into a dominant n‐type conduction by reducing the pressure, which can simultaneously suppress the hysteresis. The pressure control can be exploited to symmetrize and stabilize the transfer characteristics of the device as required in high‐performance logic circuits. The transistors are affected by trap states with characteristic times in the order of minutes. The channel conductance, dramatically reduced by the electron irradiation during scanning electron microscope imaging, is restored after an annealing of several minutes at room temperature. The work paves the way toward the exploitation of PdSe₂ in electronic devices by providing an experiment‐based and deep understanding of charge transport in PdSe₂ transistors subjected to electrical stress and other external agents.     

On the Deembedding Issue of CMOS Multigigahertz Measurements

The purpose of this paper is to address the issues of deembedding multigigahertz CMOS measurements by extensively comparing six popular methods and by proposing a new method based on two-port measurements. The comparison aims to evaluate the maximum applicable frequency of equivalent-circuit methods (open-short, three step, ...) and the effect of the source dangling leg of MOSFETs on the cascade methods (two line and thru). Fifty dummy structures and 12 MOSFETs were fabricated using standard 0.18-mum CMOS technology. It was found that, at low frequencies (<6 GHz), all method results were comparable. The open-short method performed well over the entire frequency range (0.1-40 GHz) studied. The newly developed method, called the thru-short method, uses only two dummy structures, a thru and a short, to completely deembed the parasitics from probe pads, interconnects, and the semiconducting substrate. The measurements validated the thru-short algorithm and showed its usefulness for multigigahertz on-wafer CMOS measurements.     

中空光离焦量对单熔道质量的影响

利用环形激光光内同轴送粉喷头进行单熔道试验和测试,就中空环形光离焦量对45#钢表面熔层平整度、平宽度、平高度以及熔覆截面微观组织的影响进行试验研究。通过改变离焦量,获得单道熔覆层,并进行单层熔宽、熔高及表面平整度的测试和微观组织的对比,分析了离焦量对熔层组织、性能和表面状态的影响规律。结果表明:熔覆层组织在小离焦量情况下细密,环形光激光熔覆层的硬度、表面平整度随离焦量的变大先增后减,在较小负离焦状态下可得到最大值。