水浴恒温控制仪表的设计

本论文介绍一种以AT89S52单片机为核心具有A/D转换器、数码管显示、键盘输入等功能的水浴恒温控制仪表.该控制仪表可以实现对变送后的传感器信号进行处理并显示,实现测控.该控制仪表具有显示与调节功能,远远高于一般的数字电位器,可广泛用于生产过程控制等场合.其中,信号输入通道采用A/D方式实现对被测量模拟量的数字化,既经济又能满足分辨率要求.本设计设计了一路PT100直接测温输入通道,在工业现场中可以用于采集温度信号,设置不同的参数便可以进行数据处理.输出控制信号有两种方式:继电器输出控制和D/A输出控制.键盘显示接口模块采用HD7279,实现了设定值的连续输入和温度数据实时显示.软件部分采用适用的PID算法,能够满足大多数控制系统的控制要求,实现数字化控制.     

基于VerilogHDL的TLC549控制模块的设计

结合广泛使用的TLC549串行A/D转换器,采用FPGA器件EP1C6Q240C8,对A/D转换芯片TLC549进行采样控制。整个设计在Quartus Ⅱ平台下进行软件编程和下载。采用VerilogHDL语言描述,实现正确的TLC549转换的工作时序控制过程。该设计可用于信号采集和实时监控方面,仿真结果和实际运行显示该模块工作性能稳定、可靠性高,使用方便。     

数字式温度控制器

本系统采用了AT89C52单片机,以它为中心,组成了能够对温度进行检测与控制的智能控制系统.本系统可以实现在一定范围内对温度的恒定控制.主要组成部分为:单片机PID控制以及运算部分,温度检测与传感器部分,LED显示部分等.具体的器件有:高性价比的AT98C52单片机,AD590温度传感器,ADC0809A\D转换器,LED显示器,LM317T三端稳压器件,LM324等.本系统的主要功能为通过本系统可以实现对温度的人为设定和调节.使温度的控制更加的人性化和智能化,大大减少工业成本.     

基于单片机的信号发生器

此设计用单片机AT89C51作为最小系统,利用D/A转换器将数字信号转换成模拟信号,再经过滤波放大,由示波器显示出方波,三角波,锯齿波和正弦波,同时由LED显示器显示其各自的类型以及频率。该信号发生器体积小、成本低、功能强,符合设计要求。     

基于单片机的步进电机式电动汽车组合仪表

随着计算机技术和微步进电机技术的不断发展，这给汽车仪表的技术变革带来了可能和机遇。本系统采用单片机进行电动汽车仪表的的控制，通过步进驱动电机可以对电动汽车在行驶过程中的电量、车速、温度等信息显示和自动报警的功能，实现了汽车信号的数字化控制，有利于推动汽车行业的快速发展。     

一种基于TIM总线的数据采集系统的设计与实现

介绍了一种14bit的A／D变换器（ADC）芯片，并提出了一套切实可行的数据采集系统的设计方案。针对设计过程中的关键点进行了较为详尽的研究和分析，并将之应用到TIM总线上，从而实现数据采集的模块化并行处理。在采集过程中采用纯正弦信号作为输入信号，用数字信号处理器（DSP）控制采样，并将A／D转换后的数据存储，进行FFT变换，进而来分析ADC的信噪比及有效位数。     

短波射频数字化接收机的设计与实现

针对传统中频数字化接收机复杂度高、灵活性差等问题,设计并实现了一种新型短波射频数字化接收机.该接收机由A/D、数字下变频器(DDC)、DSP、D/A、CPLD等几部分组成,实现了短波信号的射频数字化处理.详细介绍了接收机的设计方案,并对常见的调幅(AM)、等幅报(CW)、单边带(ISB)等信号进行了接收测试.在输入电平为-103～0 dB动态范围内,解调输出质量都能达到12 dB左右信纳得(SND).     

基于PT100型热电阻的矿用本安型多通道温度巡检仪的设计

本文介绍了一种基于PT100型热电阻的矿用本安型多通道温度巡检仪的设计方法，并进行了实验验证。该巡检仅采用恒流源对PT100热电阻进行激励，用电子多路开关切换通道，用A／D采样得到相应通道的电压值。单片机用分段线性法将此电压值转换为温度值。该方法精度高，误差小，可以同时采集多路温度。将该巡检仪用于监控系统中，有利于缩小系统规模，降低成本。     

基于单片机的酒精浓度测试仪的制备

叙述了一种基于单片机的酒精浓度测试仪的设计与实现过程,采用STC89C52系列单片机,设计了复位电路与单片机时钟电路、A/D转换电路、液晶显示电路、报警电路等,能够实时对有酒精浓度进行采集、检测与报警显示。     

基于FPGA的宽动态范围DPSK解调器设计

为了解决大多普勒频移、猝发通信条件下传统接收机结构复杂的问题,设计并实现了一 种基于FPGA实现的宽动态范围全数字DPSK基带接收机。采用1 bit A/D带通采样技术和差分 检测技术,在最大40 kHz多普勒频移条件下实现了70 dB动态范围。该技术已用于 某低成本毫米波数据通信系统中,实现了码速率为10 Mbit/s、动态范围大于70 dB的D PSK信号解调,系统误比特率为10-6。     

乡土中国的一个缩影——论韩少功的“马桥世界”

《马桥词典》用词典的形式构造了马桥的文化和历史,用生动、鲜活的方言口语营造出一个遗世独立、魅力十足的“马桥世界”。在这个世界里,有乡村特有的生活规范和法则;有他们独特的思维方式和价值观念;有朴素的乡土人情和神秘、奇特的民俗民风;有民间社会固有的保守、愚昧、落后、贫穷和等级观念;也有顽固的传统文化,心理和集体无意识,还有他们独立自信的民间精神。这个具有原生态色彩的“马桥世界”,实际上是一个乡土中国的缩影,它让我们看到了中国的“马桥”,看到了世界的中国。     

Authentic Leadership: An Empirical Test of Its Antecedents,Consequences, and Mediating Mechanisms

The recent economic crisis as well as other disasters such as the oil spill in the Gulf of Mexico or the nuclear disaster in Japan has fanned calls for leaders who do not deny responsibility, hide information, and deceive others, but rather lead with authenticity and integrity. In this article, we empirically investigate the concept of authentic leadership. Specifically, we examine the antecedents and individual as well as group-level outcomes of authentic leadership in business (Study 1; n = 306) as well as research organizations (Study 2; n = 105). Findings reveal leader self-knowledge and self-consistency as antecedents of authentic leadership and followers’ satisfaction with supervisor, organizational commitment, and extra-effort as well as perceived team effectiveness as outcomes. The relations between authentic leadership and followers’ work-related attitudes as well as perceived team effectiveness are mediated by perceived predictability of the leader, a particular facet of trust. We discuss the implications of our findings for theory and practice and provide suggestions for advancing theory and research on authentic leadership in the future.     

价值基础的建构:略论社会主义核心价值观的提炼与表述

核心价值观是一个国家与政党自我认同的密码,也是体现国家软实力的"核心"基因。提炼社会主义核心价值观要做到:弄清文本依据、明确学理基础、尊重实践逻辑、把握价值导向和获得群众认同。据此,可以将社会主义核心价值观表述为:以人为本、公正和谐、天下大同。     

通货膨胀目标制的政策内涵及其应用

本文从分析货币政策的规则和相机抉择之争入手，分析通货膨胀目标制作为名义锚在货币政策中的作用与政策含义，在此基础上探讨如何有效地设计和实行通货膨胀目标制。本文认为，我国货币政策在向通货膨胀目标制过渡过程中，要明确货币政策和汇率政策的主从地位，增强中央银行的独立性以及对宏观经济的分析和预测能力，解决中央银行承担最后贷款人义务而造成的通货膨胀隐患，建立核心通货膨胀指标。     

The Emergence of Iran in the World Car Industry: An Estimation of its Export Potential

In the past 10 years Iran has been emerging as a major car producer in the world. However, due to delays in economic reforms, Iranian car exports have not increased as much as production. This paper presents a first estimation of the Iranian export potential in the car industry. Based on new theoretical developments of the gravity equation, an empirical bilateral trade model is proposed. It includes sectoral variables (car production, import tariffs), as well as other original variables, such as expectations and hysteresis. We then develop a dataset which includes the 40 major car‐exporting countries in the world, 34 importing countries, a 10‐year time period as well as four car production groups. The model is then estimated by using alternative panel data estimators, such as those of Hausman and Taylor and dynamic estimators as well as transformed variables estimators. Export potential is finally calculated from the residuals of the model. Results show that Iranian current car exports are about 100 times less than their fitted values. This indicates that there is a significant export potential for Iran, especially toward India, China, Russia, as well as smaller neighbours (Turkey, Pakistan, Central Asian countries). As a result, Iran could become the major auto supplier in the Middle East. However, this requires the completion and success of ongoing economic reforms.     

基于不经意传输的拓扑隐藏广播协议设

为了保护消息广播中节点关系、地理位置等敏感信息，将高效的NTRU（Number Theory Research Unit）公钥加密算法与不经意传输协议相结合，通过引入不可信的第三方以保证广播的中间过程无法被任意节点所获知，从而实现了隐藏网络拓扑结构的目标。该协议可认为是拓扑隐藏广播的具体实现，解决了现有概念性方案中尚未涉及的秘钥重构、相邻节点身份隐藏及网络动态变化等问题。安全性分析表明，在半诚实攻击模型下该方案能够保证网络中任何一部分节点被攻破均不会导致其他节点拓扑信息泄露。此外，通过与相关概念性协议进行实验对比分析，该方案除安全性外还可充分体现计算、通信开销与节点平均度数无关的优势。     

Key components and implications of entrepreneurship: A 4-P framework

Entrepreneurship has been gaining increasing respect from the research community as a field of scholarly study as well as practical application worldwide as a means to achieve wealth creation and personal fulfillment. Yet, entrepreneurship, as a theoretical construct and practical phenomenon, remains poorly defined and its interpretation fragmented. This article attempts an eclectic account of the major ingredients of entrepreneurship and dissects the entrepreneurship process through a parsimonious 4-P framework: pioneer, perspective, practice, and performance. It is expected that this framework will help us better understand the essence of entrepreneurship: its theoretical underpinnings as well as its practical implications.     

Social media in marketing research: Theoretical bases,methodological aspects,and thematic focus

The widespread use of social media as a marketing tool during the last decade has been responsible for attracting a significant volume of academic research, which, however, can be described as highly fragmented to yield clear directions and insights. We systematically synthesize and critically evaluate extant knowledge of social media marketing extracted from 418 articles published during the period 2009–2021. In doing so, we use an organizing framework focusing on five key areas of social media marketing research, namely, social media as a promotion and selling outlet, social media as a communication and branding channel, social media as a monitoring and intelligence source, social media as a customer relationship management and value cocreation platform, and social media as a general marketing and strategic tool. Within each of these areas, we provide important theoretical, methodological, and thematic insights, as well as future research directions. We also offer useful managerial implications derived from the articles reviewed.     

新乡市沿黄地区休闲农业开发研究

本文分析了新乡市沿黄地区休闲农业开发的有利条件,如丰富的休闲农业资源与悠久的历史文化、便捷的交通、庞大的客源市场、面临良好的发展机遇及现状、地方政府的大力支持和提倡等,并提出了相应的对策与建议。     

福建省物流运输与农业经济增长的实证研究

选取福建省1978—2010年的货运量、客运量和农业生产总值作为分析指标,在对时间序列进行平稳性检验后,对福建省货运量、客运量与农业生产总值进行Johansen协整分析,并对它们进行回归分析,然后对货运量和客运量与农业生产总值之间进行了Granger因果检验。实证结果表明,福建省农业生产总值的变动与货运量和客运量的变动密切相关,货运量的增长对农业经济的发展有显著的促进作用,同时农业经济的发展也积极带动了货运量和客运量的增长。