John F. Kennedy at American University: The Rhetoric of the Possible,Epideictic Progression,and the Commencement of Peace

In his American University address, Kennedy employed epideictic progression, a pedagogical process drawing upon dissociation and epideictic norms to convince listeners, gradually, to embrace a new vision—in this case, a world in which a test-ban treaty with the U.S.S.R. was possible. To do so, Kennedy's words: (1) united the audience behind the value of “genuine peace”; (2) humanized the Soviets as worthy partners in genuine peace; (3) established the reality of the Cold War and the credibility of U.S. leadership; and (4) connected lessons on genuine peace to domestic civil rights.     

The language of the liberal consensus: John F. Kennedy,technical reason,and the “new economics” at Yale University

On June 11, 1962, President John F. Kennedy addressed the economy at Yale University. This essay explains the symbolic charge of his economic rhetoric, a persuasive campaign that enjoyed considerable success and marked the first time that a president took explicit responsibility for the nation's economic performance. I argue that the president crafted the authority to take command of the economy through construction of a liberal ethos, the use of dissociation, and a definition of the times. His arguments, in turn, were invented from the liberal matrix that dominated politics in the mid‐twentieth‐century United States and represent the ways in which that mode of discourse develops a historically contingent and politically powerful form of technical reason. President Kennedy's speech illustrates a set of strategies that can raise the status of one political language above its competitors in the process of public argument.     

基于PIC30F5015的电机软启动器的研制

依据三相交流感应电机的实际应用,介绍了基于PIC30F5015单片机控制的软启动系统结构和功能原理,给出了软启动器的设计方法,介绍了硬件电路的实现,对具体系统的控制功能和相应的算法做了详细说明,从调试的结果来看,针对不同的应用环境,实现了转矩、恒流、电压斜坡和突跳的电机软启动功能,而且系统具备过欠压保护、过流过载保护、错相报警、缺相保护、过热保护功能。     

基于DSP的信号频谱分析与实现

文章重点讨论了数字信号的频谱,利用FFT（快速傅立叶变换）和Burg（伯格）函数的分析方法,基于MATLAB环境和TM S320C 54XDSP,分析平稳随机信号和实际的语音信号功率谱密度,以期在频域提取信号的特征。     

Intellectual property rights,trade agreements,and international trade

The global process of strengthening and harmonization of intellectual property rights (IPRs) systems has been intensified in the last twenty five years by the signing of trade agreements (TAs) that include chapters with intellectual property (IP) provisions and other trade-related issues. This paper provides a first exploration of whether and how the signing of TAs with IP chapters influences bilateral trade flows for a balanced panel of 110 countries and the period 1995–2013. We address methodological issues related to the assessment of the effect of TAs on bilateral trade. We use matching econometrics to evaluate the treatment of TAs with and without IP chapters. In addition, we estimate the effects of TAs on bilateral trade in a more dynamic fashion using a panel data approach based on the gravity model. Also, we perform our analysis for trade in low- and high-IP intensive products. We found that both types of TAs increase bilateral trade but TAs with no IPRs chapters have a stronger positive effect on trade. However, if we include lags to consider that TAs with IP chapters might need a longer implementation time, the net expected increase on trade is similar for both types of TAs. We also found that the effects depend on the development level of countries and on the IP intensity of products. We found a clear positive effect for developed countries, but we do not observe important gains for developing countries in all sectors and to all destinations derived from TAs with IP chapters. This raises the question of whether trade gains can compensate the effort related with IP reforms.     

The maturation of global corporate R&D: Evidence from the activity of U.S. foreign subsidiaries

This study empirically investigates the impact of foreign country factors like market size, technological strength of industries, and science and engineering (S&E) capability on the conduct of U.S. overseas R&D during the 1991-2002 period. We find that overseas markets primarily predict the entry of U.S. R&D, while the S&E capability of nations is strongly correlated with the post-entry intensity of U.S. foreign subsidiaries’ innovative activity. We also find important inter-industry differences: U.S. electrical, electronics, computer, and telecommunication industries are strongly drawn towards overseas S&E capacity; industries including Machinery, Automobiles, and Transport equipment are primarily attracted by the technological strength of foreign industry; U.S. R&D in Chemicals mostly follows overseas markets. We discuss the implications of our results to the global organization of innovative activity and innovation policy.     

GC/MS法分析百合花化学成分

报道了用同时蒸馏-萃取装置(SDE)提取百合花的挥发性物质，测得百合花挥发油含量为5．43％，用GC/MS法从百合花的挥发油中分离确认出19种化学成分，占提取出的百合花挥发油总含量的99．56％．其主要成分在挥发油中的含量为：酸类化合物(2个)占18．44％，醇奥化合物(4个)占7．64％，酸类化合物(3个)占63．04％，醛类化合物(3个)占2.72％，烯烃类化合物(2个)占1．68％，萜类氧化物(3个)占2．45％，苯的衍生物(1个)占2．74％，酮类化合物(1个)占0．85％．并用峰面积归一化法通过化学工作站数据处理系统得出各化学成分在挥发油中的百分含量．     

基于STM32F103的电力载波小型路由器设计与实现

为解决高校节能监管系统配电站分布离散,各站内计量点规模不大时的远程集抄问题,以STM32F103处理器为核心,扩展了DL/T645-2007协议的定义,设计支持3级中继功能的电力载波（power line carrier,PLC）小型路由器。路由器以载波芯片为圆心,实际通信距离为半径,构成等效的直抄、一级中继、二级中继和三级中继蜂窝模型,并以此为基础,建立一个逻辑上以路由器为根节点,各级蜂窝覆盖圆为层次的多叉树遍历查询结构,实现了中继路由图的建立和自动中继转发抄表。所设计的中继技术在低压电力载波通信和智能水表远程集抄领域得到了成功应用,可以低成本地替代RS485以实现能耗系统的远程抄控。     

基于MSP430的低频功率放大器设计

以MSP430F135单片机作为测量和显示的核心部件,采用两级前置放大电路、功率放大电路、带阻滤波电路、电流转换电路（功率测量电路）等组成一个低频功率放大器电路系统。测试结果表明,该系统能实现信号功率放大功能,具有输出噪声低、工作频带宽（10 Hz~50 kHz）、输出效率较高的特点。     

微藻光生物反应器监测系统设计与实现

针对在微藻规模化养殖过程中,光生物反应器监控预警系统可扩展性差和管理分散的问题,设计一种在微藻养殖过程中对光生物反应器内培养液的温度、pH值和光照强度等环境数据进行实时监测的系统。实验结果表明,该系统在保证数据传输实时性的同时,提高了系统构成的灵活性,增强了系统的可扩展性,实现了对同一区域多台光生物反应器的实时监测。