Helix

摘要： The aim of this study is to investigate the helix angle effect on the helical gear load carrying capacity, including the bending and contact load carrying capacity. During the simulation, the transverse contact ratio is calculated with respect to the constant pressure angle. By changing the helix angle, both the overlap contact ratio and total contact ratio are calculated and simulated. The bending stress and contact stress of a helical gear are calculated and simulated with respect to the helix angle. Solid (CAD) modelling of a pinion gear was obtained using SOLIDWORKS software. The analytically obtained results and finite elements method results are compared. It is observed that increasing the helix angle causes an increase of the contact ratio of the helical gear. Furthermore, increasing the contact ratio reduces the bending stress and contact stress of the helical gear. However, with a constant transverse contact ratio, it is possible to improve the total contact ratio depending on the helix angle. It is concluded that a higher helix angle increases the helical gear bending and contact load carrying capacity.

摘要： 以洋常春藤(Hedera helix L.)和金边吊兰(Chlorophtum comosum variegaturn Hort.)为研究对象,在长、宽、高均为60 cm的玻璃装置中,模拟人的吸烟方式,注入2支香烟,测定48 h内CO和PM2.5浓度变化,观察处理前后植物的表型变化,并测定植物叶片生理指标变化,以研究2种垂吊植物对香烟烟雾净化能力及生长生理响应。结果表明,洋常春藤和金边吊兰均可在一定程度上吸收或吸附CO与PM2.5,净化密闭环境中的空气,且洋常春藤的单位叶面积的净化能力优于金边吊兰;香烟烟雾处理对植物生长产生了一定的影响,叶片出现黑褐色斑点或叶缘焦枯状;香烟烟雾处理后,2种植物叶片活性氧(超氧阴离子和过氧化氢)水平显著增加,造成膜脂过氧化产物丙二醛含量增加,植物通过增强过氧化物酶活性或增加脯氨酸的合成,抵御伤害,且金边吊兰的抗性强于洋常春藤。

摘要： Present long range interactions for signals, as well as large scale rare phenomena at Earthquakes are subjects of wave dynamics with large impact. Here, that will be addressed in a general (science fiction) format. The method used is based on energy balance for a continuum and kinematics of noncircular orbits, nco. Released vortex formation in a process invoking escape velocity for beamed up Dinosaurs, is modeled with fluid dynamics of a Helix. It is found that elasticity in terms of volumetric changes and vorticities interact giving large velocities and interchange of potential and kinetic energies. The model is an example of atmosphere integrative physiology.

摘要： Carbon nanotubes have been used as scaffolds for tissue engineering. However, the identification of these nanomaterials disperses in biological solutions and their direct interaction with nerve cells is still controversial. The aim of this work is to characterize the topographic and ultra-structural distribution of the composite made of multi wall carbon nanotubes-polyvinylpyrrolidone (MWCNTs-PVP) deposited on the Helix aspersa neurons and over glass coverslip. Scanning Electron Microscopy (SEM) and Confocal Microscopy (CM) studies were done to analyze the properties of such MWCNTs-PVP composite. The cerebral ganglion of Helix aspersa was treated and incubated with MWCNTs-PVP, fixing it in paraformaldehyde at 4% and was observed with SEM and CM. Although the nanotubes were not labeled or stained with fluorescent compounds, the MWCNTs-PVP deposited on glass and on nerve cells, was observed by the confocal microscope in the reflection mode. In SEM studies, it was observed that MWCNTs-PVP was attached to the surface on neurons. Moreover, in CM studies, it was possible to observe that MWCNTs-PVP was attached to the neuronal membrane, crossing the cell membrane and getting into the cytoplasm. These results support the hypothesis that carbon nanotubes interact with the neuronal cell membrane and can be useful for neuronal tissue engineering. In addition, these results open new alternatives for toxicological studies, in order to elucidate the cytotoxicity of MWCNTs-PVP composite in neurons and other excitable cells.

摘要： 风河公司日前发布了突破性的汽车软件平台Wind River Helix Cockpit,用作互联汽车的管理中心,它从设计之初就将其目标锁定在满足汽车和物联网的交叉需求。风河还升级了ISO26262认证汽车关键安全应用软件Wind River Helix Drive。Cockpit和Driver是Wind River Helix Chassis系列的最新产品。

摘要： Campus network video on demand system(VOD)is an important part of digital campus construction ,and it can make up for the shortage of traditional teaching methods and provide varieties of digital media services. A set of VOD system based on Java platform has been improved during the period of the research ,and some factors that influence the quality of service have also been found in the phase of operation and maintenance. So an optimized scheme of campus VOD system performance has been proposed and realized by experiment. The results show that the integration of Ubuntu and Helix can improve the efficiency of VOD system ,and the scheme can be generalized in practice.%校园网络视频点播（VOD）系统是数字校园建设的重要环节，可提供丰富的数字媒体服务，用以弥补传统教学手段的不足。在以前设计的基于Java的VOD系统的基础上，改进了一些影响服务质量的因素，提出了一种优化校园VOD系统性能的方案并进行实验。结果表明，Ubuntu整合Helix能提高VOD系统的运行效率，使用户有更加流畅的体验，且可推广至实际应用中。

摘要： 校园网络视频点播（VOD）系统是数字校园建设的重要环节,可提供丰富的数字媒体服务,用以弥补传统教学手段的不足。在以前设计的基于Java的VOD系统的基础上,改进了一些影响服务质量的因素,提出了一种优化校园VOD系统性能的方案并进行实验。结果表明,Ubuntu整合Helix能提高VOD系统的运行效率,使用户有更加流畅的体验,且可推广至实际应用中。

摘要： 得益于TDP仅4．5W的酷睿M处理器，让ThinkPad Helix不再需要臃肿的散热风扇模块，最终让这款采用11．6英寸大屏幕设计的平板电脑获得了9．6mm的厚度和不足800g的傲人身材，便携性毋庸置疑。作为Helix家族的最新成员，该产品同样配备了专用的键盘底座，当平板与底座结合后就可变身标准的“超极本”。

摘要： 据GigOptix旗下子公司GigOptix-Helix AG称,电光聚合物硅波导可以在CMOS芯片上以高达100 GHz的速率传输光信号。该公司将参加由欧盟资助的硅-有机杂化物集成电路制造平台项目（SOFI）,并因此已获得50万美元的项目资金,旨在证明上述概念的可行性。SOFI项目为期三年,将资助4个国家的7个研究团队展开研究。

摘要： 本发明公开了一种可提供稳定长短基线的四星Helix编队构型。使用本发明能够在一个轨道周期内提供稳定的垂直有效长基线和垂直有效短基线，从而可利用长短基线组合基线高精度干涉测高。本发明构型包括1颗主星和3颗辅星，主星轨道与各辅星轨道分别为满足Helix构型的双螺旋轨道；本发明构型在编队飞行过程中的任意时刻，主星都可以与其中一颗辅星之间形成最优垂直有效基线，满足最优基线取值范围指标，任意时刻都存在两颗辅星之间形成的有效长基线，从而在整个轨道周期内，任意时刻总是存在一组稳定的有效长基线和短基线，从而可利用长短基线组合基线高精度干涉测高。

摘要： 本发明公开了一种可提供稳定长短基线的四星Helix编队构型。使用本发明能够在一个轨道周期内提供稳定的垂直有效长基线和垂直有效短基线，从而可利用长短基线组合基线高精度干涉测高。本发明构型包括1颗主星和3颗辅星，主星轨道与各辅星轨道分别为满足Helix构型的双螺旋轨道；本发明构型在编队飞行过程中的任意时刻，主星都可以与其中一颗辅星之间形成最优垂直有效基线，满足最优基线取值范围指标，任意时刻都存在两颗辅星之间形成的有效长基线，从而在整个轨道周期内，任意时刻总是存在一组稳定的有效长基线和短基线，从而可利用长短基线组合基线高精度干涉测高。

摘要： 本发明公开了一种流感病毒HA融合肽+helix A蛋白表达载体的制备方法及其应用与引物。本发明的原理和最核心的关键技术是科学地设计扩增出pGEX‑6p‑1线性化载体以及流感病毒HA融合肽‑helix A基因片段的引物，利用商品化的重组酶ExnaseTM II不经酶切连接反应，直接在体外快速重组克隆HA融合肽‑helix A，转化大肠杆菌，经IPTG诱导表达、实现流感病毒HA融合肽‑helix A蛋白与GST的融合表达，并获得纯化的HA融合肽‑helix A融合蛋白。