三相三线电度表接线的分析判断

计量装置接线的正确与否 ,关系到电能计量的准确性 ,因三相电流的极性、三相电压的相序等原因 ,计量装置的接线方式有几十种之多 ,但只有一种接线方式是正确的。本文通过对徐州矿务集团有限公司供电系统三相三线电度表常用接线方式的分析 ,阐述了实际工作中在供电装置不停电的情况下使用简单的操作工具快速判别、处理计量装置故障的方法 。

Animal models to study Mycobacterium tuberculosis and HIV co-infection

Mycobacterium tuberculosis(M.tb) and human immunodeficiency virus(HIV) co-infection has become a public health issue worldwide. Up to now, there have been many unresolved issues either in the clinical diagnosis and treatment of M.tb/HIV coinfection or in the basic understanding of the mechanisms for the impairments to the immune system by interactions of these two pathogens. One important reason for these unsolved issues is the lack of appropriate animal models for the study of M.tb/HIV coinfection. This paper reviews the recent development of research on the animal models of M.tb/HIV co-infection, with a focus on the non-human primate models.

Ethnic diversity, tax limitations and public goods

One strand of research in public economics has found that increasing ethnic diversity leads to reductions in provision of productive public goods. Another strand of research has emphasized the key role that tax and expenditure limitations play in the provision of public services. This paper explores the interaction between these two effects. The regression results suggest that the prior results on ethnic diversity are robust when TELs are taken into consideration. In addition, the imposition of TELs mitigates the negative effect of ethnic fragmentation on the share of local spending on education and roads. It also mitigates the positive correlation between ethnic diversity and total local government revenue and expenditure per capita.

Improving Conviviality in Public Places： The Case of Naples, Italy

Under the umbrella concept of conviviality in public spaces, a research project on the rehabilitation of urban areas for commercial and retail uses---as engine of a complex process of production of places for social and cultural mixit6--has been defined. The aim of this research has been to produce useful tools for coping with the abandonment of public spaces in former commercial urban areas, without generating anonymous and globalized commercial districts. Through involving local stakeholders in a participatory process, the first phase of the research here presented needs to demonstrate the possible effectiveness of a pilot action plan in dealing with both isolation and gentrification processes of historical centres. The main hypothesis is that traditional retailers should be considered an essential element to ensure effective public use of urban public spaces. The research methodology is based on a qualitative approach. Focussing on the process of impoverishment within local commercial districts, the research group started working with local stakeholders in order to identify priorities and criticisms for enhancing a regeneration process. The case study to be carried out in Naples is the historical market place of Piazza Mercato in the Citth Bassa of Naples （Italy）.

A Common Fixed Point Theorem for Weakly Compatible Mappingsin Fuzzy Semi-Metric Space

In this paper, we establish a common fixed pointtheorem for three pairs of self-mappings in fuzzy semi-metric space which improves and extends similar known results in the literature.

The Resources, an Essential Element in the Relationship Between Public and Private

This paper＇s objective is to examine the relationship between public and private sectors through the mechanisms of public intervention in the market. With the financial and economic crisis of 2008, there has been a coordination of states （G20） for the implementation of affirmative action in order to support the international financial system. Our hypothesis is that resource dependence is the basis of all interactions between the public and private sectors. The fact that the public sector bails out private sector activity shows that it is beneficial to citizens through employment and taxes repaid by the company and all this contributes to social stability. Here we develop an argument in two phases. The first is to revisit the question of the relationship between the state and the market. The second part develops the hypothesis by focusing on the interdependence of resources. The theory of resource dependence often applied to international relations and inter-organizational business has allowed us to highlight the correlation between public and private sectors

Trade Development and Global Crisis Influence

The purpose of this paper is to create a comprehensive analysis of the development of foreign trade in the global world, the process of divergence of exports and imports under the influence political and economic changes in Europe and the economic crisis in the world. Data from world public databases are summarized to a clear and understandable form. We analyzed the share of imports and exports （due to the global trade is presented） and its potential impact on the development of current account balance （CAB） for the United States of America （USA）, the European Union （EU）, and China. Correlation coefficient timeline for the last decade of CAB and world trade is also presented to show the influence of trade flow in the world and the EU with respect to current account. The work emphasizes the clear and understandable processing of the required data, which are then formulated to make arguments and then used to make predictions of further development of world trade. From summarized data, future crisis can be predicted and impacts can be evaluated.

Research on the Decision Model to Stakeholders in PPP Projects

Aiming at the public sector and the private sector in PPP projects as the research objects, the two core participants investment decision model is established by using option game thinking. First, based on the option game features PPP projects have, the paper proposes some research hypotheses on value, income, cost for the option. Second, on the basis of the decision path of a multi-stage binary tree model, respectively for the public sector and the private sector, the paper builds up utility functions, the cost-input model and the contract decision model. It indicates that by the use of growth options in the shortened contract period, the private sector can still ensure the construction quality of the PPP project. Finally, the validity of the model in the PPP project agreement and the investment decision process is verified by the case analysis.

Investigation of Interline Dynamic Voltage Restorer with Virtual Impedance Injection

The inter-line dynamic voltage restorer （IDVR） consists of several voltage source inverters connected to different independent distribution feeders with common dc bus. When one of the inverters compensates for voltage sag that appears in its feeder （voltage control mode）, the other inverters pump the required power into the dc bus （power control mode）. Each inverter will have both voltage and power controllers; only one controller is in use during the abnormal conditions according to its feeder state. The voltage controller uses one of the dynamic voltage restoration techniques. In this paper, the in-phase technique is applied and two types of loads are considered （constant impedance and three phase induction motor）. Since the voltage restoration process may need real power injection into the distribution system, the power controller injects this power via voltage injection. This voltage injection is simulated by voltage drop across series virtual impedance. A new scheme is proposed to select the impedance value. The impedance value is selected such that the power consumed by this impedance represents the required power to be transferred without perturbing the load voltage. The performance of this system is also studied during voltage swell. A scheme for operation of multi-feeder IDVR system is proposed in this paper. Simulation results substantiate the proposed concept.

BRICS＇ Pursuit of Multipolarity： Response in the United States

In the last few years, ＂the BRICS＂ or Brazil, Russia, India, China, and South Africa have been increasingly investing in developing their cooperation and seeking to exert joint global influence. BRICS＇ mobilization has been visible in the cooperation of high-level officials, deeper policy coordination, and the creation of BRICS institutions. As the BRICS intensify their pursuit of multipolarity, surprisingly little attention has been paid to the ways in which the BRICS has been received in the United States （US）, which is a crucial stakeholder in creating a multipolar system. How is the BRICS represented in US foreign policy circles？ This article examines the state of the US debate on the BR/CS, drawing on the per- spectives from foreign policy officials, top think tanks, and academics. It argues that there is a considerable gap between BRICS＇ multipolar aspirations and the perceptions of the grouping＇s promise and potential in the US. The BRICS is often marginalized in the US as an entity, and---even if accepted as such--it is considered ineffective in terms of its results. However, the BRICS benefits US foreign policy development： it challenges US officials to clarify their message on multipolarity; it reframes the debate from bilateral China vs. US competition to multilateral processes of providing global public goods; it generates a subfield of BRICS studies, which internationalize the production and consumption of knowledge in the field of global politics.