913 resultados para missile combat
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Neste trabalho refletimos acerca das relações entre sexo, gênero, ciência e feminismo, a partir da análise da produção contemporânea de um grupo de pesquisadoras que se denominam como neurofeministas e que, desde 2010, se articulam em uma rede internacional chamada NeuroGenderings. O objetivo da NeuroGenderings é trazer uma perspectiva feminista crítica aos estudos recentes sobre o cérebro, sobretudo aqueles que buscam por diferenças entre homens e mulheres. As neurofeministas estão engajadas em produzir uma neurociência situada, assumidamente feminista, que não deixe de lado a materialidade dos corpos e especialmente do cérebro , ao mesmo tempo em que se preocupam politicamente com as hierarquias de gênero. Procuram, portanto, produzir uma neurociência empírica, capaz de produzir o que chamam de zonas de proximidade entre moléculas e paisagens políticas. Além disso, pretendem combater o neurossexismo, isto é, estereótipos em relação à masculinidade e feminilidade que estariam presentes em grande parte da produção neurocientífica, bem como em sua divulgação para o público mais amplo. Assim, mapeamos a rede NeuroGenderings a partir de duas estratégias metodológicas: a leitura e análise da produção bibliográfica das neurofeministas (tanto as publicações oficiais da rede, como publicações individuais das pesquisadoras) e a observação da reunião e conferência mais recente da NeuroGenderings, que ocorreu na cidade de Lausanne, na Suíça, em 2014. O neurofeminismo nos oferece relevante material analítico para refletirmos acerca dos ideais de cientificidade em disputa na ideia de uma neurociência feminista, levando em conta a crença de que ciência e política pertenceriam a esferas separadas e imiscíveis, e que neutralidade seria característica obrigatória à boa prática científica. Além disso, notamos aproximações entre o trabalho das neurofeministas e os trabalhos de um importante grupo de estudiosas do campo da ciência e gênero, chamadas de feministas biólogas. As feministas biólogas inspiram a produção neurocientífica, principalmente no que diz respeito à perspectiva antidualista, que rejeita a oposição entre sexo e gênero, natureza e cultura, encarando-os como entrelaçados e inseparáveis. Entretanto, embora o entrelaçamento entre sexo e gênero seja consenso entre as neurofeministas, não há acordos sobre a forma como esse entrelaçamento deve ser pensado em termos neurocientíficos. Assim, a discussão em torno do conceito de plasticidade cerebral evidencia alguns desses dissensos, bem como tensões entre ciências humanas e neurociência dentro da NeuroGenderings, rede marcada pela interdisciplinaridade. Essas tensões, porém, não inviabilizam o projeto neurofeminista de pensar o cérebro como um objeto compartilhado de conhecimento.
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Coral reefs throughout their circumtropical range are declining at an accelerating rate. Recent predictions indicate that 20% of the world’s reefs have been degraded, another 24% are under imminent risk of collapse, and if current estimates hold, by 2030, 26% of the world’s reefs will be lost (Wilkinson 2004). Recent changes to these ecosystems have included losses of apex predators, reductions of important herbivorous fishes and invertebrates, and precipitous declines in living coral cover, with many reefs now dominated by macroalgae. Causes have been described in broad sweeping terms: global climate change, over-fishing and destructive fishing, land-based sources of pollution, sedimentation, hurricanes, mass bleaching events and disease. Recognition that corals can succumb to disease was first reported in the early 1970’s. Then it was a unique observation, with relatively few isolated reports until the mid 1990’s. Today disease has spread to over 150 species of coral, reported from 65 countries throughout all of the world’s tropical oceans (WCMC Global Coral Disease Database). While disease continues to increase in frequency and distribution throughout the world, definitive causes of coral diseases have remained elusive for the most part, with reef managers not sufficiently armed to combat it.
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Mitigation plans to combat climate change depend on the combined implementation of many abatement options, but the options interact. Published anthropogenic emissions inventories are disaggregated by gas, sector, country, or final energy form. This allows the assessment of novel energy supply options, but is insufficient for understanding how options for efficiency and demand reduction interact. A consistent framework for understanding the drivers of emissions is therefore developed, with a set of seven complete inventories reflecting all technical options for mitigation connected through lossless allocation matrices. The required data set is compiled and calculated from a wide range of industry, government, and academic reports. The framework is used to create a global Sankey diagram to relate human demand for services to anthropogenic emissions. The application of this framework is demonstrated through a prediction of per-capita emissions based on service demand in different countries, and through an example showing how the "technical potentials" of a set of separate mitigation options should be combined.
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This paper discusses various techniques that may be used to combat counterfeiting in the pharmaceutical supply chain. These include the use of electronic pedigrees (to ensure the integrity of the supply chain), together with mass-serialization (to provide for a unique lifecycle history of each individual package) and authentication of the product (to check for any discrepancies in the various attributes of the product and its packaging are as intended for that individual package). Management of the pedigree process and product authentication is discussed in some detail, together with various other learnings from the Drug Security Network, including identification of some remaining vulnerabilities and suggestions for tightening these loopholes. © 2008 Springer-Verlag Berlin Heidelberg.
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Microcystins are cyclic heptapeptide hepatoxins produced by cyanobacteria. It has been shown that microcystins have adverse effects on animals and on plants as well. Previous researches also indicated that microcystins were capable of inducing oxidative damage in animals both in vivo and in vitro. In this study, tobacco BY-2 suspension cell line was applied to examine the effects of microcystin-RR on plant cells. Cell viability and five biochemical parameters including reactive oxygen species (ROS), superoxide dismutase (SOD), catalase (CAT), glutathione peroxide (GPX) and peroxide dismutase (POD) were investigated when cells were exposed to 50 mg/L microcystin-RR. Results showed that microcystin-RR evoked decline of the cell viability to approximately 80% after treating for 144 h. ROS levels, POD and GPX activities of the treated cells were gradually increased with a time dependent manner. Changes of SOD and CAT activities were also detected in BY-2 cells. After 168 h recovery, ROS contents, POD, GPX and CAT activities returned to normal levels. These results suggest that the microcystin-RR can cause the increase of ROS contents in plant cells and these changes led to oxidant stress, at the same time, the plant cells would improve their antioxidant abilities to combat mirocystin-RR induced oxidative injury. (c) 2005 Elsevier Ltd. All rights reserved.
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Rare earths are a series of minerals with special properties that make them essential for applications including miniaturized electronics, computer hard disks, display panels, missile guidance, pollution controlling catalysts, H-2-storage and other advanced materials. The use of thermal barrier coatings (TBCs) has the potential to extend the working temperature and the life of a gas turbine by providing a layer of thermal insulation between the metallic substrate and the hot gas. Yttria (Y2O3), as one of the most important rare earth oxides, has already been used in the typical TBC material YSZ (yttria stabilized zirconia). In the development of the TBC materials, especially in the latest ten years, rare earths have been found to be more and more important. All the new candidates of TBC materials contain a large quantity of rare earths, such as R2Zr2O7 (R=La, Ce, Nd, Gd), CeO2-YSZ, RMeAl11O19 (R=La, Nd; Me=Mg, Ca, Sr) and LaPO4. The concept of double-ceramic-layer coatings based on the rare earth materials and YSZ is effective for the improvement of the thermal shock life of TBCs at high temperature.
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文中研究的相关跟踪技术主要应用于飞航导弹的末制导。现阶段,激光制导技术、GPS制导技术、合成孔径雷达(SAR)制导技术在我国的实际应用还不成熟,传统的电视、红外制导技术仍然具有很强的生命力,因而,基于可见光的视频相关跟踪技术具有重要的研究价值。本文主要论述的两种相关算法是:多灰度点相关(MPC)、区域模板相关(RTC)。其中多点相关(MPC)算法的跟踪灵敏度高,定位精度好,硬件实现比较方便,实时性能好;区域模板相关算法(RTC),在图像的匹配过程中,不仅考虑了目标区域的灰度特征,而且兼顾了区域里多灰度层次的位置特征、面积特征,算法具有很好的鲁棒性。文中深入研究了两种相关跟踪算法,并针对它们在实际应用中的不足,提出了有效的改善措施。最后,本文对两种相关跟踪算法进行了初步融合,一是:通过粗匹配、精匹配过程来选取目标跟踪点;二是:提出了一种度量模板更新的能量准则函数。大量的仿真实验结果表明:改进后的两种相关跟踪技术可以较好地完成一些复杂背景下的目标跟踪任务,两种算法的有效结合又进一步提高了目标跟踪的稳定性能和可靠性能。本文研究的一些相关跟踪技术已经运用到实际工程项目中。
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提出了求解某武器系统导弹弹道轨迹的两种方法:计算机仿真和系统辨识方法.详细介绍了导弹系统的计算机仿真模型,并利用控制理论和数值分析的方法对仿真模型求解;根据系统辨识理论,将整个系统看作“黑箱”,建立与输入、输出数据等价的模型,引入折息因子对模型进行辨识.最后分别给出了计算机仿真试验曲线和系统辨识试验曲线,证明了两种求解方法的有效性。
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阐述了一种交通战备保障方案实施决策支持系统,介绍了系统的数据库系统、模型库系统的设计.该系统主要针对突发事件,为交通战备保障方案的实施提供快速、有效的决策支持。
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This year, as the finale to the Artificial Intelligence Laboratory's annual Winter Olympics, the Lab staged an AI Fair ??night devoted to displaying the wide variety of talents and interests within the laboratory. The Fair provided an outlet for creativity and fun in a carnival-like atmosphere. Students organized events from robot boat races to face-recognition vision contests. Research groups came together to make posters and booths explaining their work. The robots rolled down out of the labs, networks were turned over to aerial combat computer games and walls were decorated with posters of zany ideas for the future. Everyone pitched in, and this photograph album is a pictorial account of the fun that night at the AI Fair.
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O serviço de mensagens é um dos mais importantes em uma rede. Desta forma, medidas de segurança relativas a este serviço são de suma importância. Mensagens indesejadas, tais como propaganda, em grande quantidade por dia, têm sido a preocupação de muitos administradores de redes e de sistemas no sentido de combatê-las. Estas mensagens são conhecidas por spam. Spam é o termo pelo qual é comumente conhecido o envio de mensagens eletrônicas não solicitadas a uma grande quantidade de pessoas de uma vez, geralmente com cunho publicitário, mas não exclusivamente. Este trabalho visa a descrever mecanismos de defesa (rejeição de spams) no computador responsável pelo serviço de mensagens (servidor de correio eletrônico) quando este recebe spam.
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Urquhart, C. (editor for JUSTEIS team), Spink, S., Thomas, R., Yeoman, A., Durbin, J., Turner, J., Armstrong, A., Lonsdale, R. & Fenton, R. (2003). JUSTEIS (JISC Usage Surveys: Trends in Electronic Information Services) Strand A: survey of end users of all electronic information services (HE and FE), with Action research report. Final report 2002/2003 Cycle Four. Aberystwyth: Department of Information Studies, University of Wales Aberystwyth with Information Automation Ltd (CIQM). Sponsorship: JISC
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R. Jensen and Q. Shen, 'Fuzzy-Rough Data Reduction with Ant Colony Optimization,' Fuzzy Sets and Systems, vol. 149, no. 1, pp. 5-20, 2005.
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R. Jensen, 'Performing Feature Selection with ACO. Swarm Intelligence and Data Mining,' A. Abraham, C. Grosan and V. Ramos (eds.), Studies in Computational Intelligence, vol. 34, pp. 45-73. 2006.