Recolhimentos Compulsórios e o Crédito Bancário Brasileiro

This study analyses the effect of reserve requirements in the context of the Brazilian macro-prudential measures of 2010 and in a long-term perspective, over the last decade. Two sets of test were performed to assess the impacts of macro-prudential measures on the new loans to consumers and to corporations. It is noteworthy that there was a decrease in lending to individuals, especially from smaller banks. In the long-term analysis, it was obtained the relationship between credit variables, the reserve requirement rate, Selic interest rate and bank balance sheet variables for various types of bank credit. It was also considered the relevance of alternative short-term funding from repurchase operations and interbank deposits.

RECOLHIMENTOS COMPULSÓRIOS E DISTRIBUIÇÃO DAS TAXAS DE EMPRÉSTIMOS BANCÁRIOS NO BRASIL

This work presents a semi parametric approach to evaluate the role of the Central Bank reserve requirements, both remunerated and non-remunerated, over the bank interest rate distribution in Brazil between September/2000 and March/2004. We adopted the semi parametric approach developed by DiNardo, Fortin and Lemieux (1996), originally constructed to get the effects of minimum wage in wage inequality. We consider two more explanatory factors: i) the default rate; ii) other individual characteristics, like bank size and bank liquidity. We used the kernel method with a careful reweight choice to estimate the counterfactual bank interest rate density associated with each one of the explanatory factors. This procedure allows us to compare the relative weight each factor has on the density of interest rates and yields a visually clear representation of precisely where in the distribution the various factors have greatest impact. We used data from Cosif and from information reported by banks to the Central Bank and we restricted the estimation for two categories of bank loans: Working Capital and Personal Overdrafts. The results show negligible effects of the variation of the default rate and important effects of reserve requirement rates on banking loan rates.

Efeitos de mudanças regulatórias no microcrédito no desempenho nanceiro e social de cooperativas de crédito brasileiras

This study investigates whether the performance of credit unions that offer microcredit in Brazil was affected by the advent of Crescer – the National Microcredit Program. This research fills a gap in the literature because few papers investigate credit unions that work with microcredit and also the effects of governmental interventions related to microcredit operations. Studies of this type may help evaluate the impact of governmental interventions on the performance of the institutions that are directly or indirectly affected. Our results add to the debate about microcredit and about the inclusion of credit unions in this market. In particular, our evidence may influence the design of public policies and the strategies of microfinance institutions, which typically combine economic and social objectives. Based on the literature, we calculate fifteen indicators for each credit union, related to their financial and social performance. The inferences are based on the implementation of the difference in differences estimator using the advent of Crescer, in 2011, as the exogenous event of interest and including in the control group the credit unions that did not provide microcredit loans throughout the sample period. This research presents evidence that the volume of clients and microcredit operations performed by Brazilian credit unions was positively affected by regulatory changes that took place in 2011, consistently with the objectives of the governmental intervention. The evidence also suggests that the governmental intervention did not harm the financial sustainability of the credit unions. The main changes are: a substantial reduction of interest rates and transaction costs, the implementation of subsidies to participants in the program, and a push for public banks to enhance their supply of productive and oriented microcredit.Este estudo investiga se e como o desempenho nanceiro e social das cooperativas que ofertam microcrédito no Brasil foi afetado pelo advento do Crescer – Programa Nacional de Microcrédito. A pesquisa preenche lacuna na literatura da área, uma vez que há poucos estudos sobre cooperativas que trabalham com microcrédito e também sobre os efeitos de intervenções governamentais na área de microcrédito. Pesquisas como esta podem auxiliar na avaliação do impacto de intervenções governamentais sobre o desempenho das instituições direta ou indiretamente afetadas. Os resultados do estudo acrescentam novos elementos ao debate sobre o mercado do microcrédito e sobre a inserção das cooperativas de crédito nesse mercado. Em particular, as evidências aqui discutidas oferecem subsídio para o desenho de políticas públicas e para a de nição de estratégias de instituições de micro nanças, as quais tipicamente combinam objetivos econômicos e sociais. Com base na literatura, foram calculados 15 indicadores para cada cooperativa, relacionados ao seu desempenho nanceiro e social. As inferências baseiam-se na implementação do estimador de diferença em diferenças utilizando o advento do Crescer, em 2011, como o evento exógeno de interesse, e incluindo, no grupo de controle, as cooperativas de crédito que não forneceram empréstimos de microcrédito ao longo do período amostral. A pesquisa apresenta evidências de que o volume de clientes e de operações de microcrédito realizadas pelas cooperativas de crédito brasileiras foi positivamente afetado por mudanças regulatórias ocorridas em 2011, de forma compatível com os objetivos da intervenção governamental. As evidências também sugerem que a intervenção governamental enfocada não comprometeu a sustentabilidade nanceira das cooperativas. As mudanças enfocadas são: redução substancial das taxas de juros e custos de transação, implementação de subsídios aos participantes do programa e impulso para bancos públicos para aumentar sua oferta de microcrédito produtivo e orientado

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries