摘要：An efficient LED projector is designed for the LED flat lamp without light guide plate(LGP),in order to get high-efficiency lighting capablility and low cost of LED flat *** employing refraction and total reflection,uniform intensity distribution of the emergent light and high-efficiency lighting capablility are *** simulation results show that the output efficiency and intensity distribution on LED flat lamp panel depend on the distance between projector and output panel,the rotation angle of the projector and the gap between projector and *** performs well in both lighting efficiency and uniformity,while a distance of 5 mm,a rotation angle of 2°and a gap of 1.2mm are used with the panel size of 240 mm×360 mm in the LED flat lamp without *** 96.6%of optical uniformity is achieved.

摘要：Optical models directly effect the irradiance distribution of observed surface. Traditionally, approximate Lambertian models are widely used in designing the light-emitting diodes (LED) arrays in spite of their errors compared with the experimental data. But now a novel LED optical model for uniform illumination system has been proposed, in which the curvefitting technique is used to reduce the inherited errors and modify those previous models. The points from the curve of the LED light intensity are adopted, and a spline curve is designed for fitting, which obtains the revised mode. To verify its feasibility, we apply the new model in a 4×4 array design. The results show that compared with the approximate Lambertian, the light intensity distribution produced by the fitting model is more uniform and intense, as is expected.

摘要：Two different technologies,electro-brush plating and arc spraying,were employed to deposit copper film and brass coating on the surface of nonmetal artworks,respectively. The principles of the oxidizing corrosion and coloring were researched. The nonmetal artworks attain vivid and ancient bronze effect by the surface deposition and surface coloring processing. By using this technology,the problems of difficulty-to-plating copper and difficulty-to-archaizing for the large outdoor sculptures and other artworks can be solved,and it has prospective application due to low investment.

摘要：设计最优时间和空间差分步长是量子随机滤波(QSF)实现时变频率周期信号滤波的关键技术。本文提出用短时傅立叶变换(STFT)动态地估计输入时变频率周期信号的信噪比(SNR)和相对频率,用最小二乘法建立量子随机滤波器时间和空间差分步长与信噪比(SNR)和相对频率的模型,通过分析实际信号的特征可以逐步确定量子滤波器的参数。针对单频信号情况和频率时变信号的仿真实验结果表明,该方法能够根据输入信号的特征,快速、准确设计出滤波器最优参数,取得显著的滤波效果。

摘要：由于油资源的缺乏供应，为其他的基于煤的燃料的过程， dimethylether (DME ) ，在化学工程作为一个重要过程出现了地。与关于 DME 合成和分离的实验室实验数据，当在从 syngas 的泥浆床反应堆的 DME 的一步舞合成被采用时，为有高纯净的 DME 的生产进程被建议。根据试验性的研究和过程分析，为模拟过程的合适的单位模块和 thermophysical 计算方法被选择。合并了反应的试验性地坚定的参数为 DME 合成的动态模型，在非随机的二液体的方程(NRTL ) 的参数的回归常数与内建的性质模型，一起在 DMEseparation 系统为二进制部件当模特儿进程程序表在白杨正平台上被开发并且模仿。模拟结果与一致很好，数据在实验室实验获得了。因此，精确模拟结果把有用参考书提供给类似的设备设计和过程操作优化。

摘要：通过试验和数值模拟研究了T形钢管混凝土柱–钢梁平面框架的抗震性能,并开发了一种有限元分析模型用于研究平面框架的工程特性。基于强柱弱梁和强节点的设计原则,设计并制作了两榀1:2.5缩尺比例的T形钢管混凝土柱–钢梁平面框架,利用大型非线性有限元分析软件ABAQUS建立了所研究框架结构的三维实体模型。试验结果表明,轴压比对结构的破坏模式没有影响,随着轴压比的增大和耗能能力的提高,结构延性下降。试验结果与数值模拟结果一致,验证了开发的有限元模型的有效性与准确性。此外,开发的有限元模型有助于反映该平面框架在不同时间、不同位置的详细应力状态。

摘要：The technology of virtual machines is widely applied in many fields, such as code transplanting, cross-platform computing, and hardware simulation. The main purpose is to simulate the environment of general hardware by means of software and realize the operation of byte codes in processor. Virtual machines are commonly used to distribute programs in an architecture-neutral format, which can easily be interpreted or compiled. A long-running question in the design of virtual machines is whether stack architecture or register architecture can be implemented more efficiently with an interpreter. After introducing the basic theory, a solution to designing and realizing virtual machine constructing on register processor proposed in this paper, which gives a preliminary study on simulating the process of instructions in Intel 86.

摘要：异质原子掺杂的铂基纳米晶在多相催化领域具有广阔的应用前景,然而基于原位表面掺杂策略来优化表面原子构型仍颇具挑战.本研究通过原位表面掺杂的化学方法制备出多枝状PtNiCoRh四元金属纳米晶.抗坏血酸和铑离子的配位作用实现了铑离子的延迟还原,从而可控地将铑原子锚定在催化剂表面层.电催化研究表明原位表面掺杂的Pt_(67)Ni_(16)Co_(16)Rh_(1)纳米晶针对甲醇、甲醛和甲酸电氧化都具有优异的催化活性、稳定性及抗CO中毒特性.原位电化学红外光谱结果表明抗腐蚀性强的铑原子的表面掺杂能有效调控催化剂表面Pt位点,其中CO中毒中间体以更容易氧化消除的桥位态吸附在Rh–Pt异质位点.本研究提出的原位表面掺杂策略将有助于设计高原子利用率的高效多相催化剂.

摘要：I Stand Here Ironing is Tillie Olsen’s first novel of her back to writing after several years’*** reflects the real living condition of marginalized women through the description of a daughter by the mother’s *** on Susan ***’s distinction of three modes of narrative voice in feminist narratology,this paper analyzes three narrative voices in this *** employs multiple narrative voices in the novel in order to release the voice of the marginalized women in the silence,she destroys the male’s authority and constructs the discourse authority of silent,poor working-class women.