High-Efficiency Line Conditioners With Enhanced Performance for Operation With Non-Linear Loads

This paper presents the analysis, design, and experimental performance verification of a serial type line conditioner. Since it processes only a fraction of the load power, the overall converter losses tend to be lower and the efficiency of the conditioner higher. Regarding the dynamic performance, the line inductance, which results in a positive zero in the transfer function of the plant, is taken into consideration when designing a voltage controller with higher bandwidth for faster response. In addition, a virtual resistance is included in the control of the system to damp oscillations often seen for operations at light load and with nonlinear load conditions. Experimental results obtained with a 10 kVA prototype of a serial line conditioner fed from the load side and the proposed feedback control scheme are presented to demonstrate the superior performance of the line conditioner

Conflict of Interests of Chinese Analysts and the Recognition of Market ——From the Perspective of Asset Management

随着证券经纪业务佣金率加速下滑、投行项目逐步萎缩，券商大有向“资本型”的资产管理业务转型的趋势，资产管理业务与证券分析师的联系也会更为紧密。已有研究表明，券商的投行业务、经纪业务、自营业务等会影响证券分析师的独立性，从而引发分析师的利益冲突问题。本文试图从资产管理业务的视角探析证券分析师的利益冲突问题，利用2008-2013年券商资产管理部门的季度持仓数据以及分析师的评级和盈利预测数据，采用有序逻辑回归及OLS回归对资产管理部门是否影响分析师独立性、资产管理部门是否听从内部分析师荐股意见以及投资者的市场识别进行了研究。 实证结果表明：（1）关联分析师的确对资产管理部门重仓的股票给予了较高的评...Previous studies show investment bank business, brokerage, proprietary trading, or the relationship between the analysts and the companies listed, the consideration of personal investment point of view, commissions, new wealth rankings, Are likely to challenge the analysis 'independence . However, research on the relationship between the analysts and asset management business are rarely to seen. D...学位：经济学硕士院系专业：经济学院_金融学(含保险学)学号：1562011115195

Feeding of Triportheus angulatus (Spix & Agassiz, 1829) in the Camaleão lake, Manaus, Amazonas state, Brazil

Periodical flooding cause strong modifications in Central Amazonian floodplain. Periodical rising and decreasing of the water level influences abiotic and biotic factors of the aquatic environments. During the flooding season, there is a high feed availability, in contrast with dry season in which feed availability is at the lowest level. Limnological parameters also change seasonally. Oxygen concentrations vary both daily and seasonally, sometimes even showing hypoxic conditions. Despite these alterations, floodplain lakes are inhabited by several fish species, having the most diverse and abundant fish fauna among the Amazonian environments. This study focused on Triportheus angulatus feeding in temporal distribution in order to understand the influences of hydrological changes on individual size, diet composition and feeding even in low oxygen concentrations. In rising waters season, small individuals are predominant while the decreasing and the dry seasons there are mostly larger ones. There is a seasonal change on diet composition and this is related to feed type that is more available: during the rising, fishes eat mainly insects and zooplankton; in the flood season and drying season, seeds and fruits are predominant, and at the dry season they eat mainly insects. Feed ingestion was higher in the rising waters and mostly in the flood, and it was lower in the drying season. Feeding activity was not related with oxygen concentrations.As inundações periódicas na Amazônia Central causam profundas modificações no meio ambiente. A alternância dos períodos de cheias e secas tem influência nos fatores bióticos e abióticos do meio aquático. Na enchente e na cheia é alta a oferta de alimentos, ampliando o espectro alimentar que é restrito na seca. As variáveis limnológicas também sofrem modificações. As concentrações de oxigênio têm variações sazonais e diárias, às vezes com períodos de hipoxia. Apesar dessas alterações, os lagos de várzea são habitados por muitas espécies de peixes e estão entre os ambientes de maior abundância e riqueza de peixes na Amazônia. A distribuição temporal e a alimentação de Triportheus angulatus (Spix & Agassiz, 1829) foi estudada em um lago de várzea da Amazônia Central para entender a influência das modificações hídricas sobre o tamanho dos indivíduos, a composição da dieta e a ingestão dos alimentos mesmo em condições de baixas concentrações de oxigênio. Na enchente predominam os indivíduos menores, enquanto que na cheia, vazante e seca os maiores. Houve mudança sazonal na composição da dieta que foi relacionada com a disponibilidade de alimentos no ambientena enchente os peixes ingerem principalmente insetos e zooplâncton; na cheia e vazante frutos e sementes, e na seca insetos. O consumo de alimento foi alto na enchente e cheia, decrescendo na vazante e atingindo as menores quantidades na seca. A atividade alimentar, no período estudado, não foi influenciada pelas baixas concentrações de oxigênio existentes no lago