基于MSP430F149的手写绘图板设计

设计了以超低功耗单片机MSP430F149为主控芯片的手写绘图板控制系统。系统硬件由恒流源、信号检测、运算放大器、A/D采集、240×128液晶显示、按键输入等模块组成。系统将恒定的直流电流通过覆铜板后产生微小的电势差,并将此信号通过测量电路差分放大和比例放大,转换成可被12位A/D采集的信号;采用TLC2543进行A/D转换,快速采集表笔在绘图板某点的电势后通过软件进行数据处理,计算出触笔所在铜板的位置并输出。该系统已成功用在电子白板上。     

生物技术在食品检测中的应用

随着经济社会的不断发展和进步,人们更加重视食品安全。当前,常规的食品安全检测技术已无法满足实际检测工作的需求,所以食品检测中开始陆续使用各种新设备、新技术,其中生物检测技术凭借迅速、准确、安全等优势开始在食品安全检测中得到广泛运用,且逐渐成为食品安全监管中的主要力量。     

环境不确定下企业孵化网络治理机制对治理绩效影响研究

从企业孵化网络本身以及环境视角分析了企业孵化网络治理绩效的影响因素,通过企业孵化网络治理机制对治理绩效关系的实证分析,验证了环境不确定下企业孵化网络的契约治理机制、管理治理机制对治理绩效的影响。结果表明:企业孵化网络治理机制中的契约治理机制、关系治理机制对治理绩效具有正向调节作用;环境不确定性会扩大或缩小治理机制对治理绩效的作用强度。企业孵化网络在高市场不确定性环境下,采用关系治理机制的绩效较好;在高技术不确定性环境下,采用契约治理机制的绩效较好。     

对我国绿色国民储蓄的思考

绿色国民储蓄用财富的变化分析可持续发展的潜力,是衡量可持续发展的新方法。中国绿色国民储蓄存在地区差异,部分省份经济发展呈现不可持续性,东西部地区之间的可持续发展能力差异大于实际的经济差异。要提高中国绿色国民储蓄促进可持续发展,就必须构建适合我国国情的绿色国民核算体系,转变欠发达资源富集区经济增长方式,建立资源补偿机制等。     

The impact of relative residence times on the distribution of heavy drinkers in highly distinct environments

Alcohol consumption is a function of social dynamics, environmental contexts, individuals' preferences and family history. Empirical surveys have focused primarily on identification of risk factors for high-level drinking but have done little to clarify the underlying mechanisms at work. Also, there have been few attempts to apply nonlinear dynamics to the study of these mechanisms and processes at the population level. A simple framework where drinking is modeled as a socially contagious process in low- and high-risk connected environments is introduced. Individuals are classified as light, moderate (assumed mobile), and heavy drinkers. Moderate drinkers provide the link between both environments, that is, they are assumed to be the only individuals drinking in both settings. The focus here is on the effect of moderate drinkers, measured by the proportion of their time spent in “low-” versus “high-” risk drinking environments, on the distribution of drinkers.A simple model within our contact framework predicts that if the relative residence times of moderate drinkers are distributed randomly between low- and high-risk environments then the proportion of heavy drinkers is likely to be higher than expected. However, the full story even in a highly simplified setting is not so simple because “strong” local social mixing tends to increase high-risk drinking on its own. High levels of social interaction between light and moderate drinkers in low-risk environments can diminish the importance of the distribution of relative drinking times on the prevalence of heavy drinking.