基于单片机的小区单元门禁系统的设计

根据住宅小区安全性的要求,提出一种基于单片机的小区单元门禁系统的设计方案。系统能实现密码的输入、清除、显示、修改,并有开锁、报警、通话功能。完成了系统的硬件电路设计和C语言编程,用proteus仿真软件进行了仿真。系统克服了传统机械锁的缺点,具有成本低廉、功能实用的特点。     

粤港澳大湾区SO2平均浓度与制造业、生产性服务业集聚的空间关联特征

厘清区域产业集聚与空气污染的关系与机制,是协调经济发展与环境污染矛盾的前提与基础。利用双变量空间自相关探讨产业集聚与SO2平均浓度的空间自相关关系,再通过构建空间面板STIRPAT模型,对这种空间关系进行计量检验。结果表明,2011—2017年,粤港澳大湾区生产性服务业集聚与SO2平均浓度存在正的空间关联关系,制造业集聚、两种产业协同集聚度同SO2平均浓度存在负的空间关联性,但是关联性不显著。单一产业、两种产业协同集聚与SO2平均浓度的关联性具有显著的空间溢出效应。得出以下结论:生产性服务业集聚可能加剧空气污染,制造业集聚、产业协同集聚度则可一定程度上缓解空气污染,但这种关系不显著;单一产业及协同产业集聚对空气污染的空间溢出效应是明显的。     

太阳能热水器控制电路设计

利用AT89C52单片机为核心,配合压阻式水位传感器以及DS18B20数字温度传感器,实现了对水温和水位的自动控制:程序内部自设水温水位上下限,若水位低于设定值即可自动供水,高于设定值自动关闭电磁阀停止上水;阳光不充足的天气导致水温不足,电磁阀自动闭合,启动辅助电加热开始加热,加热到设定值电磁阀门关闭,停止加热,实现了太阳能热水器的自动节能。配合LED数码管显示电路,可以实现温度和水位参数的实时显示,并且具有故障报警功能,具有良好的稳定性和抗干扰性。     

施工企业单项工程成本控制

本文围绕防范风险、提高效益,对单项工程项目策划、实施准备、工程实施、结算支付四个业务阶段成本控制流程进行了探讨,通过整合工程项目、业务外包、采购业务、合同管理、资产管理、资金活动等六个主要业务领域,构建单项工程成本控制框架体系。     

异形件加工中步进电机的控制研究

加工异形件时最主要的工作就是对步进电机的控制,我们在加工异形件时选用AT89C51单片机对步进电机进行控制。在实验中单片机主要控制换相顺序、步进电机的速度及步进电机的位置。本文通过介绍在异形件加工过程中使用步进电机带动执行机构运行,设计出异形件加工时的硬件驱动和软件驱动,保证加工异形件是的质量和效率。在实际应用中,该系统运行稳定、可靠,设计简单实用。     

考虑质量风险的养老服务供应链契约研究

服务质量是养老服务的重要因素。针对我国养老问题,结合养老服务供应链思想,通过建立单集成商、多合作性提供商的质量风险模型,研究集成商和提供商之间不同质量激励合同对服务质量和供应链收益等要素的影响,探讨了合同成立的潜在条件,并分析了合同内变量之间存在的潜在关系。发现在满足一定条件时,适当的激励系数会使得提供商产生合作关系、提高风险防范水平并增加供应链各部分收益。对供应链风险环境下有效激励合同的建立提供一定理论依据。     

An evaluation of the management of the Finnish employment service

This paper analyses the efficiency of the Finnish Employment Service's management in selecting unemployed individuals who are offered a job. The database used considers short-term unemployed individuals who face the same labour market conditions in 1996. Duration analysis with a Weibull model has been performed in order to study the determinants of the transition probability from unemployment into employment and the impact of receiving job offers through the Employment Service (ES). In order to carry this out, it has been taken into account that the reception of such job offers may be endogenous because the ES selects the individuals who will receive the offers. The empirical results suggest that the decisions made by the ES are adequate in the sense that they increase the benefit of society, compared with a random assignment of the vacancies offered through the ES. Moreover, the effects of the other determinants depend on whether the individual receives offers. The results also point out that individuals who receive no offers through the ES are more likely, as time passes by, to be discouraged in searching for a job than those who do.     

欧洲银行联盟的设想、争论及前景

2012年以来,欧洲银行联盟作为欧洲应对欧债危机的重要举措被提出,并在几个月内取得显著进展,但目前,围绕欧洲银行联盟作用及相关制度设计还存在较多争论与分歧。文章详细回顾了欧洲银行联盟设想的细化与改进过程,以及各方对重大争议问题的相关看法,指出欧盟各国将会努力推动银行联盟建设,但由于涉及问题的复杂性和艰巨性,银行联盟建设只能分步进行,其长期作用有待观察。     

The WTO,the Doha Round Impasse,PTAs, and FTAs/RTAs

Beginning in 2001, the Doha Rounds afforded World Trade Organization (WTO) members the opportunity to develop equitable trade rules between the developed and developing member states. The WTO has been successful in advancing multilateral international trade; however, since the Doha Rounds stalemate, it has witnessed the development of more than 300 Preferential Trade Agreements (PTAs) and over 500 Free Trade Agreements (FTAs). This article attempts to answer two questions: (1) has the failure of the Doha Rounds contributed to the proliferation of PTAs and FTAs, and (2) are these agreements threatening the regulatory authority of the WTO, which, in turn, reduces its ability to effectively promote and govern free trade, and its mission?     

The Analysis of U.S. Deposit Insurance System and the Enlightenment to China

U.S. deposit insurance system has important and deep influence on the building and operating of the deposit insurance system for many countries in the world. Based on the analysis of the development stage and status quo of the U.S. deposit insurance system, this paper suggests that China should learn from the experience of U.S. deposit insurance system, to build and perfect the laws of deposit insurance system, and the mandatory, the scope, the insurance premium, and the top insurance amount of the deposit insurance system should be stated, and the deposit insurance agencies should maintain their independence and restrain the moral hazard. Only in that way can the deposit insurance system of China be built and perfected.