煤粉管道堵塞故障分析

文章结合运行调整,分析了300 MW直接空冷机组,锅炉采用中储式制粉系统运行中因给粉机叶轮孔板销子脱落,煤粉自流引起煤粉管道堵塞对机组安全运行的影响,通过对故障现象的分析,介绍了故障诊断及处理过程.     

含有氨基酸基团的聚(ε-己内酯)合成与表征

采用氨基酸钠游离的氨基引发ε-己内酯单体开环得到酯肽齐聚物,并以六亚甲基二异氰酸酯为扩链剂,将这些齐聚物扩链合成4种聚酯酰胺.将4种天然氨基酸(L-丙氨酸、L-亮氨酸、L-谷氨酸、L-赖氨酸)引入到聚(ε-己内酯)(poly(ε-caprolactone),PCL)中,合成和表征了4种含有氨基酸残基的聚合物.通过1H-NMR、FT-IR、水接触角、水吸收率和降解实验对该聚酯酰胺进行了表征.实验结果表明:经氨基酸改性PCL的亲水性和降解性得到了改善,其中含有L-赖氨酸残基的聚酯酰胺因亲水性最高,降解速率最快.     

On the human resources management and development of construction enterprises

人力资源是21世纪市场经济中最重要的竞争力,而建筑施工企业的人力资源仍存在许多问题,必将制约该行业的发展.文章从人力资源管理与开发的理论出发,阐述了建筑施工业中人力资源的现状,分析了现状背后的原因,并提出了相应的对策建议.     

Synthesis of graphene on a Ni film by radio-frequency plasma-enhanced chemical vapor deposition

Large-area single-or multilayer graphene of high quality is synthesized on Ni films by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) at a relatively low temperature (650℃).In the deposition process,a trace amount of CH4 gas (2-8 sccm (sccm denotes standard cubic centimeter per minute at STP)) is introduced into the PECVD chamber and only a short deposition time (30-60 s) is used.Single-or multilayer graphene is obtained because carbon atoms from the discharging CH4 diffuse into the Ni film and then segregate out at its surface.The layer number of the obtained graphene increases when the deposition time or CH4 gas flow rate is increased.This investigation shows that PECVD is a simple,low-cost,and effective technique to synthesize large-area single-or multilayer graphene,which has potential for application as electronic devices.     

Towards a Contingency Resource-Based View of IT Business Value

Empirical research on the business value of IT has often been underpinned by the indispensable tenet of resource complementarity in the resource-based view (RBV) and the crucial concept of fit rooted in contingency theory. Increasingly, it has been recognised that IT needs to be integrated with other organisational factors to create business value. However, empirical studies differ in varying degrees from what organisational factors to be examined and their research findings, but also have been largely biased towards examining pairwise relationships between IT and organisational factors. This paper argues that IT is an integral part of a system of interrelated organisational factors and that a holistic approach is required to further understand when, how and why IT creates business value. After summarising what has been learnt from empirical studies of IT business value, this paper discusses the key conceptual issues of internal fit and resource complementarity as currently conceptualised and employed in the research domain. In order to continue advancing knowledge, this paper argues for and presents a contingency RBV to provide an alternative conceptualisation of IT business value. Essentially, the contingency RBV conjectures that the level of IT business value depends on the interaction of a whole system subject simultaneously to multiple moderators and mediators. Finally, this paper concludes with a discussion of the value of the contingency RBV and its implications for future research.     

一个关于{1,2,…,n}排列的猜想（英文）

我们证明了孙智伟的下述猜想:对任意不等于3的正整数n,存在{1,2,dos,n)的一个全排列(a_1,…,a_n)使得a_1=1,a_n=n,并且a_1+a_2,a_2+a_3,…,a_(n-1)+a_n,a_n+a_1都与n互素     

经济落后地区城市规划区范围界定研究——以安徽省涡阳县为例

首先指出目前我国出现的大城市将市域范围全部纳入规划区的现象,阐述经济落后地区不适合采取大城市的做法的原因,接着分析了<城乡规划法>规定的规划区的内涵,指出我国目前规划区划定存在的主要问题,最后以安徽省涡阳县为例,小议对经济落后地区规划区范围界定的研究和认识.     

多线语音应用程序设计

介绍了事件驱动状态的工作原理，在此基础上，给出了一种多线语音应用程序设计方案。     

钢筋混凝土梁非线性有限元分析在实际工程中的应用

文章利用有限元分析软件ANSYS对实际工程中的梁进行非线性分析,介绍了ANSYS中钢筋混凝土梁建模过程,并对其性能进行评价,对实际工程提出了建议:应对PKPM直接生成的梁配筋进行修正,否则会造减框架结构中梁超强.     

利用荷移反应分光光度法测定苯唑西林钠

以丙酮溶液为溶剂,利用苯唑西林钠与对硝基酚发生荷移反应,建立了测定苯唑西林钠含量的一种新方法。苯唑西林钠与对硝基酚发生荷移反应后生成稳定的1∶1络合物,该络合物最大吸收波长为401.4 nm,线性范围10～80μg/mL,表观摩尔吸光系数ε=2.22×103L.mol-1.cm-1。苯唑西林钠回收率(质量分数)在98.35%～100.20%范围内,相对标准偏差≤2.71%。该方法简便、快速,可用于测定药物制剂中苯唑西林钠的含量。