Arrow

摘要： 本研究将Arrow型零泊松比蜂窝结构用于空间抛物柱面天线。首先分析零泊松比蜂窝结构柱面成型所需加载方式,通过几何计算初步得到柱面成型所需载荷;再将ABAQUS分析、曲面拟合和型面精度计算整合为优化目标函数;然后采用蚁狮优化(ALO)算法求解使得型面精度最高的优化载荷,使用有效集法(Active Set)作为对照组,验证蚁狮优化算法的性能。优化结果得到了RMS为0.071 mm的抛物柱面,证明了将零泊松比蜂窝结构用于柱面天线反射面的可行性。与几何计算结果相比,通过ALO算法使得其型面精度提高了45.5%,收敛所需迭代步数为有效集法的1/7,证明了ALO算法对于解决初值未知优化问题的有效性和高效性。研究结果对于零泊松比蜂窝结构的优化设计和ALO算法的应用具有一定意义。

摘要： 随着孤儿作品越来越多,如何对这些作品的著作权和使用权进行利用,成为了一直以来的热门话题。本文借鉴了欧洲ARROW项目的建设经验,对版权、著作权、知识产权等权利信息进行分布式管理的自动化系统——ARROW进行了介绍,以期对我国的孤儿作品的版权问题提供可以借鉴的对策。

摘要： Arrow是一种基于内存的列存储数据结构,它的设计目标是在现代硬件上提高数据分析性能.Arrow自2016年以来,在大数据领域被越来越多的主流项目使用,并成为异构系统数据传输的标准,如今已经支持C++、Go、Java、Python、R、Ruby和Rust等多种编程语言实现.自助查询引擎的兴起是大数据发展的新趋势.本文介绍了一种基于Arrow技术的分布式查询引擎的设计和实现,并结合实验验证了它的实际性能.

摘要： In this paper, an alternative approach to cosmology is discussed. Rather than starting from the field equations of general relativity, one can investigate the probability space of all possible universes and try to decide what kind of universe is the most probable one. Here two quite different models for this probability space are presented: the combinatorial model and the random curvature model. In addition, it is briefly discussed how these models could be applied to explain two fundamental problems of cosmology: Time’s Arrow and the accelerating expansion.

摘要： In this paper we consider properties of the four-dimensional space-time manifold M caused by the proposition that, according to the scheme theory, the manifold M is locally isomorphic to the spectrum of the algebra A, M ≅Spec (A), where A is the commutative algebra of distributions of quantum-field densities. Points of the manifold M are defined as maximal ideals of density distributions. In order to determine the algebra A, it is necessary to define multiplication on densities and to eliminate those densities, which cannot be multiplied. This leads to essential restrictions imposed on densities and on space-time properties. It is found that the only possible case, when the commutative algebra A exists, is the case, when the quantum fields are in the space-time manifold M with the structure group SO (3, 1) (Lorentz group). The algebra A consists of distributions of densities with singularities in the closed future light cone subset. On account of the local isomorphism M ≅Spec (A) , the quantum fields exist only in the space-time manifold with the one-dimensional arrow of time. In the fermion sector the restrictions caused by the possibility to define the multiplication on the densities of spinor fields can explain the chirality violation. It is found that for bosons in the Higgs sector the charge conjugation symmetry violation on the densities of states can be observed. This symmetry violation can explain the matter-antimatter imbalance. It is found that in theoretical models with non-abelian gauge fields instanton distributions are impossible and tunneling effects between different topological vacua | n> do not occur. Diagram expansion with respect to the -algebra variables is considered.

摘要： Einstein theorized that a mass travels towards another mass, not because it is attracted by a force acting across a distance, but because it travels through space and time that is warped by masses and energy. Einstein postulated that this space-time fabric can have wave-like modes which have been measured by the LIGO experiment. A consistent model of the generation of space-time-fabric-modes by a light Photon is derived for slight space-time deformations. Each Photon generates a shower of very small amplitude space-time fabric modes. Each mode can have a number of energy quanta. The probability of a Photon generating a shower of space-time modes is much larger than the probability of all the space-time modes collecting and generating a Photon. Therefore, this process has a unique Arrow of Time. Similar to the energy quanta of displacement modes in an elastic medium which is called Phonons, the energy quanta of the space-time fabric modes are called gravity Phonons. Both are tensor waves. Gravity Phonons have spin angular momentum of 2 and propagate with the speed of light. At every step of these calculations, equations derived from the General Relativity Theory by scientists and verified by Astronomical observations or experiments are employed.

摘要： 高科技公司Protacon近日宣布收购ARROW工程公司,该公司专注于通过数字化和可视化管理来提高制造业的生产力。通过此次收购,双方将能够持续为其现有客户群提供新型服务。这笔交易是Protacon今年的第五次公司并购。ARROW工程公司将成为Protacon集团的重要部分作为子公司运营。公司已经运营了25年,目前为30个国家的约500名客户提供了服务。ARROW是其自身专业领域中最杰出的公司之一,同时在制造业基础级生产管理的数字化和工业生产中的最适合的流程开发中非常优秀。

摘要： Golden Arrow资源公司宣布其在阿根廷的卡塔马卡省安托法亚（Antofalla）金银贱金属项目首个金刚钻探计划结果。勘查区面积为4公里×4公里，设计钻孔11个，总进尺3000米。经过钻探，在斯萨亚北（Cizalla Notre）发现有银贱金属矿化，分布在两条平行的剪切带内。

摘要： This paper, in conjunction with recent Flat Space Cosmology (FSC) publications, provides theoretical support for cosmic time being an emergent property of cosmic entropy and temperature. Therefore, if Verlinde’s “emergent gravity” theory is correct, both time and gravity are most fundamentally emergent properties of cosmic thermodynamics. Since emergent properties within complex systems with a huge number of degrees of freedom are often not definable at the smallest scales, these results suggest that quantum time and quantum gravity may be no more definable than consciousness within two connecting neurons. String theorists now struggling to define quantum space-time and quantum gravity should bear this in mind.

摘要： 本实用新型涉及医疗辅助技术领域，尤其为一种ARROW管外套，包括导管护套、导管下端护垫和导管上端护垫，所述导管护套的一端连接在导管下端护垫一侧壁的中心处，所述导管护套的另一端连接在导管上端护垫的侧壁中心处，本实用新型通过设置ARROW管外套整体采用乳胶材质制造，从而乳胶表面光滑，紧贴患者皮肤，且有一定的透明度，容易观察，同时方便引流管螺旋接头刚好半包在里面，方便医生冲洗，并且制作简单，且材质防水，提高患者舒适度，解决了ARROW管外露部分较大且有棱角，自带的引流连接导管也有3个较大的外露部分，很容易压迫患者的皮肤，引起患者不适，且术后有很多患者需带管回家，影响患者的正常生活的问题。

摘要： 本实用新型提供了一种基于空芯光纤的ARROW型气压湿度复合传感器，由G652D型单模光纤和空芯光纤依次连接，湿敏薄膜涂敷在空芯光纤的表面，并在空芯光纤的包层刻蚀一条直径为6μm～8μm的微通道,使得空芯光纤内部与外界环境相通。当外界的湿度发生改变时，空芯光纤的表面薄膜吸水膨胀或失水皱缩，折射率和体积同时变化，导致该器件的谐振波长发生漂移；当外界的气压发生改变时，空芯光纤的内外部折射率也随之改变，导致该器件的谐振波长发生漂移。当利用光谱仪监测输出光谱时，通过光谱的漂移量解调出气压和湿度的变化量，从而达到检测气压和湿度的目的。该装置具有结构紧凑、灵敏度高、抗电磁干扰等优点，能适用于实际生产生活的环境气压湿度检测。

摘要： 本发明提供一种基于Apache Arrow文件格式的投影列查询方法及系统，属于数据库投影列数据查询领域，本发明包含以下两个模块：1)Arrow文件列元数据读取模块，上层传递需要查询的列id集合，通过文件读取接口对arrow文件主体内容进行获取，进而读取到文件主体中每一列数据的元数据；2)Arrow文件投影列读取组织模块，根据模块一中获取到的每一列元数据进行数据读取，需要根据上层传递下来的所需要查询的列id集合进行列数据读取以及组织操作。