车轮上的螺旋桨世爵D12

世爵(SPYKER)汽车设计师认为:汽车设计的细节应该强调汽车外形的美观性。但是在设计汽车时,又绝不仅仅是在创造一个外形,更多的是在外形设计上采用恰当的比例,营造出无法抗拒的魅力。所以从世爵D12车轮中伸出一对螺旋桨的商标,不但铭刻了世爵的历史,更记载了一个鲜活的传奇。     

现代工业炸药发展动态与试验方法

现代工业炸药的发展与应用技术具有以下特点: 1.大规模应用和不断发展炸药材料; 2.改变炸药品质,用低感度粒化与含水炸药替代危险性细粒胶质混合炸药; 3.炸药材料向使用现场最易合成加工的方向转变;     

Low-field 3-DFT MRI: conceptual, analytical, and experimental aspects

Three-dimensional Fourier transform (3-DFT) magnetic resonance imaging (MRI) offers advantages in terms of signal-to-noise (S/N) per unit of time for the case where a large number of slices is desired. This advantage is enhanced when the relaxation time, T(1 ), is short. Because time limitations in 3-DFT imaging force the use of short time intervals, TR, between excitations of a slice, lesion contrast is often undesirable at mid-and high-field strength even when the S/N is good. At low fields, where T(1) values are short, high S/N and contrast can both be achieved with 3-DFT MR images. The conceptual and analytical aspects of low-field 3-DFT MRI are presented and demonstrated at 640 G.     

Investigations into the molecular-level adhesion characteristics of hydroxyapatite-coated and anodized titanium surfaces using the molecular orbital approach

It has been established that the adhesion of cells on to the surfaces of orthopaedic implants depends on the ability of the surfaces to accommodate protein molecules. Hydroxyapatite coating and anodizing are the most common methods to make TiAl6V4 implants (Ti) more biocompatible. In this paper Spartan 02, a molecular dynamics software, is used to analyze and predict the bonding characteristics of Extra cellular matrix protein sequence arginine-glycine-aspartic acid (RGD) on a Hyrdoxyapatite (HA) coated Ti and an anodized Ti surface based on the property of its constituent atoms, their polarity (net electrostatic charge, Qr), the energies of the molecular orbital E_HOMO (energy of the highest occupied molecular orbital), and E_LUMO (energy of the lowest unoccupied molecular orbital). The results show favourable criterion for formation of bonding between the HOMO orbital of the HA coated and anodized surfaces and LUMO orbital of the glycine strand from the RGD unit. The mechanism of bonding of individual atoms to form primary calcium oxide compounds is likely only in the case of HA coated surfaces . The surface texture of the anodized Ti with inherent porosities appear more responsible for the adsorption of proteins on to them by mechanical interlocking than the formation of any intermediate calcium oxide compounds.     

幻灯片旁白直接录制

很多时候,我们为了增加演示的效果,可能会考虑在演示文稿中嵌入自己的声音增强效果,需要涉及第三方工具软件来解决这一问题,其实如果你使用的PowerPoint是2010或更高版本,那么根     

Field observations to determine the influence of population size, location and individual factors on pedestrian walking speeds

This study measures pedestrian walking speeds in New Zealand to estimate the influences on mean walking speeds as these concern urban planning and pedestrian facility design. Research was conducted using field observations of walking speeds under different conditions: gradient and urban/rural townships. The data show complex interrelationships between environment, personal characteristics of pedestrian and physical factors. Mean walking speeds between 80-95 m/min are observed. These results do not support the idea that walking speeds are indicative of pace of life. Rather, walking speeds are proposed as being an indicator of the environment's 'walkability', as a walking speed that closely reflects that of the mean population is a key indicator of the successful design of pedestrian facilities.     

好音乐听出来 暑期主流2．0音箱选购

学校放暑假了,学生朋友在玩游戏之余,自然也少不了欣赏一下自己喜欢的音乐,在悠扬的音乐声中度过酷暑,为炎热的天气带来一丝清凉。对于喜爱音乐的用户而言,目前2．0音箱仍然是听音乐的首选,相比2．1音箱,2．0音箱能够获得更加纯净的音色,更适合用来欣赏音乐。那么暑期2．0音箱如何选择呢？且让小编带你到市场走马观花,看看暑期音箱市场主流的2．0音箱产品。