A noise immunity controlled quantum teleportation protocol

Quantum Information Processing - With the advent of the Internet and information and communication technology, quantum teleportation has become an important field in information security and its...     

基于DUBBO+ZOOKEEPER计量服务平台研究

基于DUBBO+ZOOKEEPER的计量服务平台是互联网与传统计量检测服务业相结合的产物,平台系统设计充分考虑了计量行业特点,在此基础上确定系统的建设目标,重点解决分布式系统集群中数据共享、数据一致性与服务水平扩展等问题。系统遵循JF1069-2012、JJF1033-2014、GB/T19022.1、ISO10012-1、ISO9000和ISO/IEC17025等规范,使用JAVA语言和众多开源框架,融入先进的管理理念,对涉及涵盖政府、计量技术机构、企事业单位、高校各个部门计量行业的工作程序进行全面的规范和整合,实现以服务为中心,对计量资源人、才、物(标准、规范、检测业务、器具证书)等方面的科学管理,同时辅以决策支持和实时的智能化预警机制。构建计量管理知识资源化、数字化具有十分重要的现实意义和应用价值。     

艺术教育建筑交往空间构成手法

艺术专业在教学中对交往、交流有着较高的要求,在目前的艺术教育建筑内,设计师也越来越多地考虑到这一点,在空间内部设置有各种形式的交往空间场所,然而空间之间的串联也是很重要的,对于各种形式的合理组合,也很好地决定了今后交往空间的使用。本文对于各种空间形式的串联提出一些方法。使得各种交往空间成为一个整体贯穿于建筑内部,这样各种交往空间得到更适宜的使用。     

基于灰色多层次综合评价法的户式中央空调系统优化

户式中央空调系统可供选择的方案较多,而反映空调系统方案优劣的指标是多方面的,评价指标的合理选择是保证优选结果正确的关键因素。为了综合评价整个系统性能的优劣,文中采用灰色多层次综合评价法建立空调方案优化选择的数学模型,以北京某户式建筑为例,在综合考虑经济性、节能性、环保性和可靠性等指标的基础上,对空气源热泵系统、户式燃气空调系统、风冷冷水机组+燃气锅炉系统、水环热泵系统、土壤源热泵系统和太阳能热泵系统6种方案进行了优化选择。优选结果表明,水环热泵系统为最优的户式中央空调系统方案。     

电视操作系统(TVOS)研发及产业化

以国家863重大专项为依托,结合当前的热点技术,如:云计算、物联网、新型交互等,从用户需求出发,以应用场景为牵引,阐述了自主TVOS研发的必要性、可行性、研发内容、研发策略,并提出自主操作系统未来和自主CPU、自主SoC相结合,打造自主生态系统的发展趋势。     

改善PCB镀铜均镀性

该文阐述了改善PCB镀铜均镀性的基本方法。     

Formation and microstructural characterization of whey protein isolate/beet pectin coacervations by laccase catalyzed cross-linking

The purpose of this study was to characterize the properties of stable and reinforced protein–polysaccharides complex coacervations firstly formed by electrostatic interaction between WPI and beet pectin, and followed by laccase cross-linking through ferulic acid present in beet pectin. The interaction of whey protein isolate (WPI, 6 g/100 ml) with beet pectin (0–0.16 g/100 ml) in aqueous solutions was studied at different pH (3–7). ζ-potential and light-scattering techniques were used to provide information about the electrical charge and aggregation of individual biopolymers and complex coacervations. Stable WPI/beet pectin complex coacervations were formed when system consisted of 6 g/100 ml WPI and 1 g/100 ml beet pectin at pH 3.5. The microstructure and viscoelastic properties of WPI and beet pectin complex coacervations in the presence of laccase (0, 100, 300 U) was also studied using FT-IR, rheology, and confocal laser scanning microscopy (CLSM) techniques. The results obtained clearly showed that laccase catalyzed cross-linking of ferulic acid present in beet pectin had a remarkable influence on the physical properties of WPI–beet pectin complex coacervations microstructure. The reinforced complex coacervations formed fine networking structures which may provide convenient means for food industry to incorporate bioactive components into food products.     

应用变速控制力矩陀螺的航天器姿态自适应控制

为提高敏捷挠性航天器在轨连续机动的快速性和高稳定性,应用变速控制力矩陀螺(variable speed control moment gyroscopes, VSCMGs)作为姿态控制执行机构,提出了一种将观测器与自适应控制结合的姿态控制律与VSCMGs复合操纵律。考虑到机动过程中挠性模态及精确惯量不可知,采用模态观测器和转动惯量估计器对不可测的状态或参数进行辨识,辨识结果用于精确估计前馈补偿力矩,利用Lyapunov分析方法证明了闭环控制系统的稳定性。鉴于VSCMGs实际使用的力矩分配能力、避奇异能力、轮速平衡能力与末态框架角定位能力,分别设计了加权伪逆操纵律与3种对应的零运动。基于雅可比矩阵条件数提出了末态框架角的优选方法,给出了VSCMGs零运动在机动过程不同阶段的部署方案。结果表明：通过连续姿态机动数值仿真验证了所提算法的有效性;VSCMGs在连续机动过程中平滑切换模式,在不同的机动阶段实现了相应功能。模态观测值和惯量估计值在多次机动后收敛至真值附近,经过参数辨识后的控制器使航天器在机动末端更快更稳地达到指向精度要求。     

Surface wettability and flow properties of non-metallic pipes in laminar flow

In this paper, three liquids flowing in five pipes with the same inner diameter of 14 mm were studied to determine the relationship between the surface wettability and flow properties in laminar flow(Re b 2000). This was motivated by oilfield observations of increased pressure drops in non-metallic pipes compared to those in metal pipes,which was contrary to expectations. A new expression for the frictional coefficient that considers the Reynolds number and contact angle θ in laminar flow for non-metallic pipes was proposed based on the experimental results of single-phase flow using dimension and regression analyses. The solutions of the anomalous phenomenon were proposed from the perspectives of the pipe diameter, contact-angle difference, and the compatibility between flexible composite pipe and JLHW105 oil according to the new formula. The surprising finding was that the surface wettability could control the frictional resistance by the critical contact angle(39.9°) obtained at the same Reynolds number. If 0° b θ≤ 39.9°, the frictional coefficient increased as the contact angle increased. In contrast, if 39.9° b θ b 180°,the frictional coefficient decreased with increasing contact angle. The influences of the pipe diameter and contactangle difference on the pressure drop difference of JLHW105 oil showed an inversely proportional relation. A series of materials and liquids were tested. The selection of pipe material for transporting a given fluid can be based on the contact angle, surface tension, and critical limit of the contact angle obtained. The research results are expected to provide some guidelines for the selection of the appropriate pipe material for a given set of fluids.     

外端加厚油管喷雾正火技术

探讨了外端加厚油管的喷雾正火装置和工艺,提出高温快冷,低温缓冷的工艺措施,取得了工作力学性能合格小的结果。