关于设计教学的一点思考

设计在我国已由学府研究、社会倡导阶段逐步走向市场，并产生一定的社会效益，从而推动设计的教学向更深层次发展。本文是关于设计教学的一点思考。     

Method for eliminating zero spectrum in Fourier transform profilometry

Windowed Fourier transform (FT) is introduced into Fourier transform profilometry (FTP) to extract zero component included in deformed fringe pattern without capturing two fringe patterns with π phase difference. First, we extract zero component of deformed fringe image using windowed FT and normalize it, then calculate the normalized Fourier spectra of deformed fringe image, finally subtract the zero component from Fourier spectra of deformed fringe image. We give the theoretical analysis of the proposed method. The experiment is carried out to demonstrate that the method can eliminate zero component and extend the measurable slope of height variation to nearly three times of the conventional FTP.     

Sub‐millisecond response phase modulator using a low crossover frequency dual‐frequency liquid crystal

A high birefringence (Δn = 0.292 at λ = 633 nm, 25°C) and low crossover frequency (<1 kHz at T = 25°C) dual‐frequency liquid crystal (DFLC) mixture was developed. The high birefringence enabled us to use a thin liquid crystal cell, which is helpful for fast response time and low operating voltage. The initially low crossover frequency allowed us to operate the DFLC device at an elevated temperature, which significantly lowers the viscosity while keeping the crossover frequency in an acceptable range (<10 kHz). We demonstrated a 2π phase shifter at λ = 633 nm using such a DFLC and obtained a sub‐millisecond response time at T～45°C. This type of DFLC mixture together with elevated temperature operation opens a new way for achieving fast response time.     

Robust view selection in multiview stereo

A robust view selection algorithm for multiview stereo matching is presented. Different from the existent view selection algorithms which pick only the believable views for matching, this method assigns an adaptive weight to each target view based on the dissimilarity between it and the reference view. So it can utilize the information of all views more sufficiently. The algorithm has been evaluated with different real images to demonstrate its robustness.     

原子吸收光谱法测定过氧化氢-柠檬酸溶液中铁铬镍钴

研究了原子吸收光谱法测定压水堆主回路去污液过氧化氢-柠檬酸溶液中铁、铬、镍、钴的影响因素,选择了合适的测量条件,用合成样品进行了试验.结果表明.铁、钴、镍、铬含量在0.5～5mg·L~(-1)范围的回收率为100%±10%,相对标准偏差为6.0%～10%.     

冬春季节兰州市品蔬菜抗坏血酸含量的变化

研究了冬春季节中兰州９种市品蔬菜抗坏血酸含量的变化，对各种蔬菜在冬春不同时期的维生素Ｃ营养价值进行了评价，初步估计兰州居民在元月下旬至四月初期间的维生素Ｃ日供给量较低，约为４０～５５ｍｇ．     

海南“精分症”病人锌铜铁锰钙测定值及临床分析

经对我省151例精分症病人发锌铜铁锰钙等元素检测．发现：1．锰较常人及其他病种者明显偏高，同时伴有锌铜钙偏低，铁偏高．与一般锌高锰相应增高的情况有异．2．海南精分症患者以青壮年为多，此受检者中超过半数。亦与其他省区南差别。初步探讨了其原因．     

成色剂分子的~1H核磁共振谱研究

对20多种β双酮、吡唑酮及酚(包括苯酚)型的黄、品、青成色剂分子作了~1HNMR谱的测定和解析。并用INDOR技术和自旋模拟程序等确定了~1H化学位移和偶合常数。还对分子内的受阻旋转、活泼氢状态以及互变异构体的动力学现象作了讨论。     

某型内转子光电雷达稳定平台的模态分析与优化

为了更好地设计某型内转子光电雷达稳定平台,运用Pro-E软件对其进行了三维实体建模,合理简化后,进入Ansys软件建立有限元模型.应用有限元理论和Ansys软件对该平台进行了模态分析,得到稳定平台前八阶模态的固有频率和振型.其中对比了不同网格、不同材料产生的不同模态,对同类分析提供了参考,也为此稳定平台的设计优化提供了...     

Single machine scheduling problem with two synergetic agents and piece-rate maintenance

This paper attempts to study on the single machine scheduling problems with two synergetic agents, each has a set of nonpreemptive jobs and a regular objective function depending on the completion times of its jobs only. It is not only necessary to satisfy the constraints of each agents objective function, it is necessary to minimize an aggregate increasing objective function of two agents’ objective function. Furthermore, this paper proposes a new kind of machine maintenance: piece-rate maintenance, which depicts the scenario that machine maintenance is implemented once every a fixed number of jobs is completed. Hence, it explores into the single machine scheduling problems with two synergetic agents and piece-rate maintenance. If the regular objective function of each job is polynomial, it can be observed that these problems are all polynomially solvable.