高校建设虚拟现实技术实验室的构想

随着虚拟现实技术在教育技术中发挥越来越明显的作用,其进入高校已成必然趋势,然而目前国内仅有北京航空航天大学、武汉大学等几所高校建设了比较完善的虚拟现实技术实验室.高校应该在充分认识虚拟现实技术并具备建设能力的情况下,尽快使虚拟现实技术在教学中发挥作用.本文在全面介绍虚拟现实技术发展及应用的前提下,论述了高等院校建设虚拟现实技术实验室的必要性、可能性和其在实现高校科学发展中的重要价值,并提出了高校建设虚拟现实技术实验室的具体构想.     

虚拟现实—21世纪的新科技

虚拟现实技术被誉为２１世纪的新科技。本文简要地讨论了虚拟现实技术的含义，介绍了９３系统博览会的虚拟现实技术表演，回顾和讨论了虚拟现实技术表演，回顾和讨论了虚拟现实技术的一些关键技术的发展，介绍了德国开发该技术的一些努力，讨论了该技术的应用前景。     

虚拟旅游：足不出户走遍万水千山

正2016年被称为VR(虚拟现实技术)爆发元年,众多虚拟现实的产品从概念走向现实。"VR+旅游"也因此成为了可能改变旅游业未来的热词。北京师范大学虚拟现实与可视化技术研究所所长周明全认为,虚拟现实技术所提供的沉浸式体验恰好符合旅游的体验需求,所以将虚拟现实与旅游相结合是自然而然的事情。但就目前虚拟现实旅游的推广而言,存在着技术     

从’93系统博览会的虚拟现实技术表演说起(上)

本文简要地讨论了虚拟现实技术的含义,介绍了’93系统博览会上的虚拟现实技术表演,回顾和讨论了其中一些关键技术的发展,介绍了德国开发虚拟现实技术进行的一些努力,讨论了该技术的应用前景。     

VR技术在网购中的初探

本文对虚拟现实技术在电子商务网络购物中的应用进行了初次探试,主要讲述了在虚拟现实技术支持下的网上购物模式,虚拟现实技术的发展前景以及发展阻碍。     

人工智能时代下虚拟现实技术在室内设计中的应用研究

在人工智能时代,虚拟现实技术的出现给传统室内设计工作模式提供了崭新的思路,极大提高了室内设计的工作质量和效率,同时为市场受众带来更加直观的体验感受。从虚拟现实技术的概念出发,阐述了虚拟现实技术对室内设计的意义,探讨了虚拟现实技术在室内设计中的实践应用效果,以期对我国室内设计的发展具有积极的促进作用。     

基于虚拟现实技术的齿轮五杆机构综合

虚拟现实技术是一种新型的人机交互系统,是现代机械设计发展方向.探讨运用虚拟现实技术进行齿轮五杆机构综合,提出了基于虚拟现实技术的齿轮五杆机构综合系统方案.     

虚拟现实技术在水文地质中的分析研究

本文首先介绍了虚拟现实技术的特点和虚拟现实系统的类别,通过研究,阐述了虚拟现实技术在水文地质中的应用情况,表明这种技术为不可见的水文地质现象提供了三维立体表达、科学可视化开辟了一个新的方向。     

沉浸式虚拟现实交互艺术设计研究

虚拟现实技术最重要和最基本的属性为交互性、沉浸感、创想性,5G的运用为沉浸式虚拟现实技术的使用和普及创造了条件.同时,硬件和技术的发展使沉浸式虚拟现实进行艺术设计时随时可能扩展与改写,并且交互设计对虚拟现实技术的发展和人们生活水平的提高都产生了重大影响.     

虚拟现实技术在医学领域的应用研究

对虚拟现实技术的概念、特征和虚拟现实系统的组成进行阐述,并介绍虚拟现实技术在医学领域的应用,最后举例说明虚拟现实技术对军事医学教学训练的影响。     

Groove profile modification of blazed gratings by dip coating with hardenable liquids

We modify groove profile of various blazed gratings with groove densities as great as 3600 lines/mm by dip coating with hardenable liquids with the aim of reducing the blaze angle. The groove profiles resulting from coatings with different layer thickness are measured by atomic force microscopy. A highly reproducible blaze angle reduction to as high as a factor of 6 is achieved with mechanically ruled as well as ion-beam-etched holographic blazed gratings. Blaze angles, to as small as 0.7 deg, which are required for vacuum-UV and soft-x-ray applications but can hardly be formed with sufficient groove profile accuracy by direct ruling, are realized with this coating technique.     

硅酸二钙及以其为主要矿物的低钙水泥的研究进展

硅酸二钙是一种钙含量较低的硅酸盐胶凝矿物,与传统高钙硅酸盐矿物硅酸三钙相比,其具有石灰石消耗少、生成能耗低、水化热低、水化产物中氢氧化钙含量少等显著特点,发展以硅酸二钙为主要矿物的低钙水泥符合节能减排和可持续发展的要求,是水泥工业发展的重要方向。对硅酸二钙的结构、晶型转变及水化活性的研究情况进行了综合评述,并对以硅酸二钙为主要矿物的低钙水泥的组成、性能及存在的主要问题进行了介绍。在此基础上,指出了以硅酸二钙为主要矿物的低钙水泥研发的技术方向。     

羧基化单分散交联微孔聚苯乙烯微球的制备

以苯乙烯为主单体,丙烯酸为功能单体,二乙烯基苯(DVB)为交联剂,偶氮二异丁腈为引发剂,乙腈和甲苯为溶剂,采用回流沉淀聚合法合成了单分散羧基化交联聚苯乙烯微球;然后以1,2-二氯乙烷为溶胀剂,二甲氧基甲烷为外交联剂,在三氯化铁的催化下发生傅-克超交联反应,实现微孔化。采用傅里叶变换红外光谱、扫描电子显微镜、激光粒度及Zeta电位、比表面积及孔隙分析对微球结构进行了表征。结果表明,通过实验可以得到具有良好球形形貌和单分散性的交联微孔聚苯乙烯微球;随着丙烯酸含量增加,交联微球的带电量增加;随着DVB含量的增加,实现了微孔化且比表面积呈上升趋势,其中当DVB用量为60%时,其比表面积达到606.06 m2/g。     

尼龙亲和膜的制备条件优化及其表征

尼龙膜经稀盐酸水解、壳聚糖改性后,以木瓜蛋白酶为亲和膜的配基,通过戊二醛的活化处理后采用共价结合的方法将配基键合在尼龙膜上,从而得到有特异吸附性能的尼龙亲和膜.本实验考察了制备尼龙亲和膜的交联剂戊二醛的质量分数、pH值、温度、反应时间和酶用量对亲和膜上木瓜蛋白酶活力的影响,确定了最适合的制备条件:pH=9.0,质量分数为0.5%的戊二醛,反应温度为45℃,反应时间为6 h,酶用量为10 mg/mL.该优化条件下制备的尼龙亲和膜具备优良的色谱性能,可用于分离纯化半胱氨酸蛋白酶抑制剂.     

Electric poling and electromechanical characterization of 0.1-mm-thick sensor films and 0.2-mm-thick cable layers from piezoelectric poly(vinylidene fluoride-trifluoroethylene)

Piezoelectric polymers have been proposed for many sensor and actuator applications. Among these, piezoelectric polymer films with thicknesses between several tens and a few hundreds of micrometers as well as coaxial cables with piezoelectric polymer layers are highly suitable and attractive for the detection of mechanical loads. In addition to good piezoelectric properties, materials for such sensors should have high mechanical strength. Therefore, the most common materials are nonporous piezoelectric polymers, such as polyvinylidene fluoride (PVDF) or its copolymer with trifluoroethylene (P(VDF-TrFE)). Here, P(VDF-TrFE) polymer films as well as the operating principle and the geometry of piezoelectric polymer cables are described. As active piezoelectric cable layer, P(VDF-TrFE) (76/24) was employed. After electrical poling with one or more point-to-cable corona discharges, the polarization in the P(VDF-TrFE) layer was investigated. Poling parameters, such as electric field and poling time, were varied. The resulting polarization was characterized with measurements of polarization profiles across the film or the cable-layer thickness as well as with the determination of other electromechanical quantities. The optimized poling process yields good piezoelectric properties in the piezoelectric polymer layers as well as useful sensor properties of the piezoelectric polymer cable, which are assessed and discussed.     

The evolution of an aerosol cloud under conditions of diffusion mixing with gas

The one-dimensional problem of mixing of aerosol with gas, accompanied by phase transitions, is solved in a self-similar formulation. The evolution of temperature and concentration fields is studied as a function of the initial temperatures of aerosol and gas, as well as of the particle density of vapor in gas. The options are analyzed of mixing of aerosol with cold and warm gas, as well as with superheated vapor.     

CO_2作为载冷剂的制冷系统：系统及分析

介绍采用CO2作为载冷剂的制冷系统,分析其控制方式。对以NH3为制冷剂、CO2为载冷剂的制冷系统为例进行分析计算,并对具体的应用案例进行分析。通过优化设计及控制系统可以使CO2作为载冷剂的制冷系统的效率在一定程度上得到提高,安装成本也能得到很好的控制。     

Metrology of pulsed radiation for 157-nm lithography

In the framework of current development in 157-nm lithography we have investigated the performance of photodetectors with emphasis to their stability and linearity. The measurements were performed in the radiometry laboratories of the Physikalisch-Technische Bundesanstalt at the Berlin electron-storage rings BESSY I and BESSY II with spectrally dispersed synchrotron radiation as well as with highly pulsed F2 laser radiation at 157 nm in combination with a cryogenic radiometer as the primary detector standard. Relative standard uncertainties of as little as 1% were achieved for the calibration of photodetectors in the spectral range of ultraviolet and vacuum-ultraviolet radiation.     

氨制冷系统热虹吸冷却技术

阐述了沸腾高压氨液作冷却液的热虹吸环流间接冷却的原理,介绍分析了带热虹吸贮液器的典型热虹吸油冷却系统、带卧式贮液器的热虹吸油冷却系统、多台油冷却器的热虹吸冷却系统的流程,以及热虹吸油冷却系统的设计。