科学家研制出万能流感疫苗 无需每年接种

科学家已经研制出了一种注射一次就可以终身抵御所有流感病毒的疫苗,从而可以免除每年冬天接种流感疫苗的麻烦。研究发现这种新型万能流感疫苗可以有效抵御许多不同类型的流感病毒,包括致命的禽流感和H1N1流感病毒。研究人员称,该疫苗只需接种一次。     

X道难,不至于上青天

蜀道难,难于上青天。一个一年多年以前的感叹到现在一张直飞成都的机票就可以轻松搞定。套用一句经典的广告语"科技让生活如此简单"。其实反观过去,太白兄想过一趟蜀道当真有很难吗?他上可以辞官逍遥去,下可以"五花马,千金裘,呼儿将出换美酒",当真雇几个人一路抬着他、     

专利知识问答

1什么是专利？ 答：专利是法律授予发明创造的一项独占权,它既可以是一项产品,也可以是一种生产方法,也可以是解决某个问题的技术方案。2专利有哪几种类型？答：我国专利法规定有3种专利,分别是发明专利、实用新型专利和外观设计专利。     

“免费”也是一种商业模式

一种商业模式既可以统摄未来的市场,也可以击垮当前的市场——在我们这个现代经济社会里,这并非一件不可能的事。‘免费'就是这样一种商业模式,它所     

儿童娱乐虫虫车的设计

设计了一款新式的儿童车,它不仅可以实现整体车身前行,还可以进行上下起伏运动。运动起来的车体就若一只向前蠕动的顽皮虫子,具有较强的趣味性。这款儿童车的运动节奏舒缓,外形时尚可爱,在保证其安全性的同时又很舒适,可以让家长安心。     

[I/O-Link]I/O-Link 接口可显著降低布线的费用

I/O-Link接口可以实现二进制点对点连接的对话功能。除了流程信号之外,可以通过一条三芯标准电缆,对参数,诊断数据和状态数据进行传送。由于可以省去并行的布线工作,在安装和布置机器设备时,可以节省大量的时间。由此,自动化专用设备的生产厂家可以从中受益。     

专利文摘

橡胶轮胎切割装置 本发明提出了一种橡胶轮胎切割装置,包括电机子装置、箢一刀具轴、第二刀具轴以及多个大刀盘和小刀盘。大刀盘和小刀盘间隔地布置,可以有效地将轮胎切割成块状。第一切割刀可以切断轮胎钢丝,第二切割刀可以切割轮胎的橡胶部分。     

改进型测量设备符合新的工作任务要求

涡轮机和泵的制造厂家可以通过一种加装系统来显著提高坐标测量仪的工作效率。一方面可以更快速地获得测量点,另一方面可以实现以往无法实现的形状分析。     

虫草/甜菜碱复合饲料营养液的HPLC分析

虫草/甜菜碱复合饲料营养液可以作为一种饲料添加剂加入饲料中,其不仅可以大大提高饲料中营养成分,还可以促进动物的摄食行为,使动物在短期内获得更多营养。为便于从饲料中检测出此营养液,本文发展了一种测定饲料中虫草发酵废液和甜菜碱含量的方法。该法可以很好的同时分离甜菜碱与虫草发酵废液中各组分。     

台湾科学家研制的新型“液丝”电子阅读屏

台湾的研究者们最近开发出一项新技术,可以利用丝织品来制作电子阅读器显示屏。这一新技术不仅可以让电子阅读设备呈现出更加柔韧的特性,还能大幅度降低显示屏的生产成本。国立清华大学黄振昌教授称,这项技术的实用性非常强。它基于一种名为“液态丝”的物质运作的——从蚕丝中提取出来的此种蚕丝蛋白可以制成薄膜,用来充当介电层材料。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...