21 research outputs found

    发展循环经济的金融支持及对策

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    循环经济是实现经济效益和生态效益均衡发展的重要经济发展方式,其对减少生态污染、促进经济的可持续发展有着重要作用。但要实现循环经济的发展必须依靠一定的金融支持,而目前我国循环经济的金融支持体系还不够成熟,因此要求有关人员必须要加强对循环经济金融支持体系的研究,并采取有效措施予以应对。本文就循环经济的模式选择以及循环经济和金融支持之间的关系进行简要分析,然后就应该如何发展我国循环经济的金融支持提出若干建议

    ST段抬高型急性心肌梗死院前溶栓治疗中国专家共识

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    急性心肌梗死仍然严重威胁我国人民健康,在我国广大城乡地区,形势更为严峻[1,2]。及时救治急性心肌梗死患者,降低死亡率和保护心脏功能刻不容缓。鉴于我国的实际情况,院前溶栓治疗在大城市以外的城乡地区具有重要意义。为此,中国医师协会胸痛专业委员会及中国医学救援协会心血管急救分会专门组织有关专家制订了本共识,旨在帮助院前医疗急救人员对急性心肌梗死患者选择最佳

    浦城县大口窑调查勘探报告

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    浦城县大口窑是宋元时期闽北地区一处著名的窑场,以烧造青白瓷为主,此外还兼烧部分酱釉瓷、少量绿釉瓷等。器型种类丰富,质量较高,窑业技术与江西景德镇窑关系密切。其产品在东亚、东南亚等地有发现,是福建一处重要的外销瓷生产地

    First Sagittarius A* Event Horizon Telescope Results. VIII. Physical Interpretation of the Polarized Ring

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    In a companion paper, we present the first spatially resolved polarized image of Sagittarius A* on event horizon scales, captured using the Event Horizon Telescope, a global very long baseline interferometric array operating at a wavelength of 1.3 mm. Here we interpret this image using both simple analytic models and numerical general relativistic magnetohydrodynamic (GRMHD) simulations. The large spatially resolved linear polarization fraction (24%–28%, peaking at ∼40%) is the most stringent constraint on parameter space, disfavoring models that are too Faraday depolarized. Similar to our studies of M87*, polarimetric constraints reinforce a preference for GRMHD models with dynamically important magnetic fields. Although the spiral morphology of the polarization pattern is known to constrain the spin and inclination angle, the time-variable rotation measure (RM) of Sgr A* (equivalent to ≈46° ± 12° rotation at 228 GHz) limits its present utility as a constraint. If we attribute the RM to internal Faraday rotation, then the motion of accreting material is inferred to be counterclockwise, contrary to inferences based on historical polarized flares, and no model satisfies all polarimetric and total intensity constraints. On the other hand, if we attribute the mean RM to an external Faraday screen, then the motion of accreting material is inferred to be clockwise, and one model passes all applied total intensity and polarimetric constraints: a model with strong magnetic fields, a spin parameter of 0.94, and an inclination of 150°. We discuss how future 345 GHz and dynamical imaging will mitigate our present uncertainties and provide additional constraints on the black hole and its accretion flow

    潮州東南地區之地質

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    功率分流渐开线花键副齿向载荷分配规律研究

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    以功率分流系统中的两种典型渐开线花键副为研究对象,分别建立了纯转矩作用下齿向载荷分配系数的解析模型,研究了载荷作用位置、转矩分配和花键扭转刚度对齿向载荷分配的影响。结果表明,对于第一种渐开线花键副,随着齿向载荷分配位置和载荷分配比例的增加,最大载荷分配系数先减小后增加,存在最优载荷作用位置和最优载荷分配比例,使最大齿向载荷分配系数达到最小,减小比例分别为56.67%和51.83%;当左侧扭转刚度为450×106 N/rad且右侧扭转刚度为522×106 N/rad时,最大载荷分配系数达到最小值2.08;对于第二种渐开线花键副,随着左侧转矩位置的增加,最大载荷分配系数逐渐增加,增加比例为14.36%;而载荷分配对最大载荷分配系数的影响很小;随着扭转刚度的增加,最大载荷分配系数呈线性比例增加,增加比例为16.86%

    复合镍铁乙烯聚合催化剂制备双峰聚乙烯

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