ispLSI1016在数字锁相环中的应用

讨论了采用ispLSI1 0 1 6构造数字锁相环的基本方法 ,并给出了分频器、相位比较器和吞脉冲计数器的相应的编码指令     

Cu-Ce(La)OX变换催化剂的制备和性能考察

本文对采用共沉淀法制备的Cu-Ce(La)Ox高温变换催化剂进行了研究．首先研究了中和pH值、中和温度、焙烧温度和方式对催化剂性能的影响，其次研究了CuO、CeO2和LaOx含量对催化剂性能的影响．5％CuO-CeO2-La(10％)Ox高温变换催化剂的最佳制备工艺条件为pH=11，中和温度为54℃，400C焙烧4h．催化剂的最佳配比组成为：CuO为20％、CeO2 70％、LaOx 10％．XRD晶相分析表明，5％Cu-Ce-La(10％)Ox催化剂中除了主相CeO2以外，还出现了Cu与La形成的钙钛矿型复合氧化物CuLaO2，且CuLaO2高度均匀地分散在主相CeOx中．还原态中除了CeO2、CuLaO2外，还出现了Cu单质，因此这类催化剂的活性中心不可能是简单的CuLaO2或Cu，从而使催化剂无论氧化态还是还原态都具有基本相同的活性，其活性位形态结构需要进一步研究．     

预消化悬浮液进样GFAAS法测定饲料样品中的铜

采用预消化悬浮液进样GFAAS法测定饲料样品中的铜，并对测定条件进行了较深入的研究。通过对照实验证明，该法与常用的湿法消解法无显著性差异。本法的精密度（RSD）为3．76％，加标回收率为95％。     

反馈型振荡器起振条件的新研究

阐述了目前被广泛应用的对于反馈型振荡器的分析方法在描述起振条件和稳定条件时存在严重的逻辑缺陷。提出了一种普适的起振条件判据,推导出两组具体而又具有实际指导意义的起振条件判据,阐明了不存在“频率稳定条件”的理由。     

双核铜(Ⅱ)与N,N,N′,N′-四〔2-(2-吡啶基)乙基〕(o,m,p)苯二甲酰胺配合物的合成与表征

通过酰氯与胺的作用合成了配体Ｎ,Ｎ,Ｎ′,Ｎ′－四〔２－（２－吡啶基）乙基〕（ｏ,ｍ,ｐ）苯二甲酰胺．该配体和铜（Ⅱ）配合,合成了三种新配合物,并以红外光谱、电子光谱、摩尔电导率、元素分析及核磁共振谱进行了表征．     

试论双回路维稳模型

社会领域也存在某种惯性趋势,即社会趋稳性。这一概念的提出旨在说明,一切不稳定的产生,必定是受到某种作用力的结果。而社会趋稳性与变动力量的结合,便会造成不同程度的反作用力。这种反弹行为在实践中很容易被界定为＂不稳定因素＂。由于维稳的主客体都是人,而＂人是需求动物＂,所以,维稳的具体政策若不能够融入人的思考、理解及感情,将很难实现人际有效的沟通,进而妨碍动态稳定的实现。以组织平衡理论、需求层次理论、安全阀理论及组织学习理论为基础的双回路维稳模型的提出,旨在强调人类需求、基本秩序以及自然法则在维稳中的关键作用。     

Repurposing Materials and Waste through Online Exchanges: Overcoming the Last Hurdle

Online material and waste exchanges (OMWEs) provide online channels to repurpose by‐products, unused materials and waste from industrial and commercial facilities. Unfortunately, OMWE's also have challenges. First, sellers may have access to other disposal options and, as a result, may not fully commit to the exchange. Second, buyers can face high uncertainty about the product exchanged and the transaction being undertaken. Overcoming these challenges is the “last hurdle” to making OMWEs successful. This study investigates the factors that reduce the buyers' uncertainty and increase the sellers' commitment to the OMWE. We analyze novel transaction‐level data from an online exchange (MNExchange.org) combined with other archival public records on county‐level repurposing and disposal statistics. First, we find that regional repurposing policies and alternatives have a complementary effect on sellers' commitment toward OMWEs, resulting in increased OMWE exchanges. However, regional disposal policies and alternatives have a substitution effect on sellers' commitment, resulting in reduced exchange success. Further, greater product and transaction information reduce the buyer's uncertainty and increase exchange success. Finally, the analysis shows that users' (buyers and sellers) heavily rely on their prior experience with OMWEs. Specifically, higher familiarity between the buyer–seller pair and familiarity with the OMWE system leads to higher likelihood of exchange success. This study lays the foundation for understanding OMWEs and has important implications for developing policies and operations to increase online transactions of by‐products, materials and wastes.     

Causality and interdependence analysis in linear econometric models with an application to fertility

This paper is an applied analysis of the causal structure of linear multi-equational econometric models. Its aim is to identify the kind of relationships linking the endogenous variables of the model, distinguishing between causal links and feedback loops. The investigation is first carried out within a deterministic framework and then moves on to show how the results may change inside a more realistic stochastic context. The causal analysis is then specifically applied to a linear simultaneous equation model explaining fertility rates. The analysis is carried out by means of a specific RATS programming code designed to show the specific nature of the relationships within the model.     

原子吸收法测定硫酸中的铁、铜含量

介绍了用原子吸收法测定硫酸中铁、铜含量的方法，考察了6种表面活性剂的增敏效果后。选择质量分数为0.2％的吐温-80作增敏剂。测定结果的相对标准偏差为0.41％-5.52％；铁的检测限达到0.0086μg／mL，灵敏度为3.19μg／mL；铜的检测限为0.0194μg／mL。灵敏度为5.36μg／mL；Fe与Cu的加标回收率在97.3％-100.3％g围内。     

多次加入电位滴定法测定铜材中痕量氯

研究了以银电极为指示电极、多次加入格氏电位滴定测定铜材中痕量氯的方法和实验条件，回收率９３．４％，相对标准偏差６．５％．