无人战斗机综合控制系统自动机动轰炸仿真研究

通过对无人战斗机进行综合火力/飞行控制系统设计,对无人战斗机在自动机动攻击方式下进行了仿真.从仿真结果可以看出,所提出的综合方案是适用、可行、有效的.把火力飞行综合控制系统应用到无人战斗机,提高了无人机的攻击精度,减少了遥控指挥人员的干预.     

Identification and control for heart rate regulation during treadmill exercise

This paper proposes a novel integrated approach for the identification and control of Hammerstein systems to achieve desired heart rate profile tracking performance for an automated treadmill system. For the identification of Hammerstein systems, the pseudorandom binary sequence input is employed to decouple the identification of dynamic linear part from input nonlinearity. The powerful epsilon-insensitivity support vector regression method is adopted to obtain sparse representations of the inverse of static nonlinearity in order to obtain an approximate linear model of the Hammerstein system. An Hinfinity controller is designed for the approximated linear model to achieve robust tracking performance. This new approach is successfully applied to the design of a computer-controlled treadmill system for the regulation of heart rate during treadmill exercise. Minimizing deviations of heart rate from a preset profile is achieved by controlling the speed of the treadmill. Both conventional proportional-integral-derivative (PID) control and the proposed approaches have been employed for the controller design. The proposed algorithm achieves much better heart rate tracking performance.     

Fabrication of Microcavity Light-Emitting Diodes Using Highly Reflective AlN–GaN and Ta2O 5–SiO2 Distributed Bragg Mirrors

We report the fabrication of microcavity light-emitting diodes (MCLEDs) with high reflectivity and crack-free AlN-GaN distributed Bragg reflector (DBR). The 5lambda microcavity structure consists of an n-type GaN, ten pairs InGaN-GaN multiple quantum wells and p-type GaN sandwiched between the hybrid cavity mode of an AlN-GaN and a Ta₂O₅-SiO₂ DBR. The AlN-GaN DBR has 29 periods with insertion of six AlN-GaN superlattice layers showing a crack-free surface morphology and a high peak reflectivity of 99.4% with a stopband of 21 nm. The output power of MCLED is about 11 W at an injection current of 7 mA. The electroluminescence has a polarization property with a degree of polarization of about 51%.     

Generalised nearest feature line for subspace learning

Nearest feature line (NFL) is a powerful tool in pattern recognition, which generalises the representational capacity of available prototypes by using linear interpolation and extrapolation between the feature points. NFL is generalised to subspace learning so that the obtained subspace has desirable discriminating ability. Experiments on face recognition demonstrate its effectiveness.     

Formation of Gold and Silver Nanoparticle Arrays and Thin Shells on Mesostructured Silica Nanofibers

Mesostructured silica nanofibers synthesized in high yields with cetyltrimethylammonium bromide as the structure‐directing agent in HBr solutions are used as templates for the assembly of Au and Ag nanoparticles and the formation of thin Au shells along the fiber axis. Presynthesized spherical Au and Ag nanoparticles are adsorbed in varying amounts onto the silica nanofibers through bifunctional linking molecules. Nonspherical Au nanoparticles with sharp tips are synthesized on the nanofibers through a seed‐mediated growth approach. The number density of nonspherical Au nanoparticles is controlled by varying the amount of seeded nanofibers relative to the amount of supplied Au precursor. This seed‐mediated growth is further used to form continuous Au shells around the silica nanofibers. Both the Au‐ and Ag‐nanoparticle/silica‐nanofiber hybrid nanostructures and silica/Au core/shell fibers exhibit extinction spectra that are distinct from the spectra of Au and Ag nanoparticles in solution, indicating the presence of new surface plasmon resonance modes in the silica/Au core/shell fibers and surface plasmon coupling between closely spaced metal nanoparticles assembled on silica nanofibers. Spherical Au‐ and Ag‐nanoparticle/silica‐nanofiber hybrid nanostructures are further used as substrates for surface‐enhanced Raman spectroscopy, and the enhancement factors of the Raman signals obtained on the Ag‐nanoparticle/silica‐nanofiber hybrid nanostructures are 2 × 10⁵ for 4‐mercaptobenzoic acid and 4‐mercaptophenol and 7 × 10⁷ for rhodamine B isothiocyanate. These hybrid nanostructures are therefore potentially useful for ultrasensitive chemical and biological sensing by using molecular vibrational signatures.     

均匀会聚菲涅尔透镜设计及性能研究

提出了一种均匀会聚菲涅尔透镜设计方案,透镜基于离轴聚焦设计,采用方形非旋转对称结构,利用光强叠加实现均匀会聚.文章基于该方法建立了几何聚光比分别为56、100、400和900倍,焦距分别为300 mm、400 mm、500和600 mm的透镜模型,并利用光学仿真软件对其聚光性能进行分析.研究结果表明:基于该方法设计的透镜能够较好地实现均匀会聚,且聚光效率和聚光分布均匀度均超过80％,可以满足聚光光伏需要.     

毛霉蛋白酶提取方法的研究

研究了不同浓度的ＮａＣｌ溶液、不同温度条件及不同取方法对腐乳生产菌和睦我霉的蛋白酶的提取效果。４０℃、０．３ｍｏｌ／Ｌ的ＮａＣｌ溶液分次提取可得最大酶活力。     

黑色保健粥配方及工艺的研究

以黑米和黑木耳为原料,根据老年人的营养需求,运用计算机设计了黑色保健粥的配方,对其工艺进行了探讨,该产品具有营养和食疗的双重作用。     

浅谈近红外NIR分析仪在制粉行业中的应用

介绍了近红外ＮＩＲ 分析仪的原理、优点、可测定的物质成分及其在制粉工业从原粮接收到生产加工到产出成品的质量控制中的应用。     

克鲁维酵母突变株UV-G-40-3菊粉酶性质的研究

研究了克鲁维酵母突变株（Ｋｌｕｙｖｅｒｏｍｙｃｅｓ－ＵＶ－Ｇ－４０－３）所产菊粉酶的分布为胞外酶∶胞壁酶∶胞内酶比是５．７∶１．６∶１。该酶Ｓ／Ｉ为５．３,最适温度为５０℃,最适ｐＨ为４．５,在５０℃以下、ｐＨ４．５～８的范围内比较稳定,４℃贮存稳定性好,１４ｄ后仍保持７６％活力,为外切型菊粉酶,酶解粗菊糖（洋姜提取液）活性为纯菊糖的４倍。