Research and Development of CNC System for Wire Bending Robot

随着金属线材制品在建筑、家饰及汽车领域中的广泛应用，目前，我国已成为一个金属线材制品的生产大国。然而通过市场调研发现，目前我国在金属线材的生产方式上还处于劳动密集型阶段，与现代设计制造所倡导的“高效、高精度、高智能化”的理念相背离。随着技术交流的日益扩大，市场上虽然出现了专门用于金属线材自动化生产的数控制造装备，但相关核心技术仍由国外少数知名企业所掌握。要从根本上改变这一落后局面，有必要对金属线材成形原理及其数控加工技术等关键技术进行深入研究，从而开发出具有自主知识产权的金属线材数控成形装备。因此本论文围绕这一主题，以实现金属线材的智能高效生产为目标，利用数控技术和可换多模位高柔性成形工艺技术...At present, with the wide application of metal wire products in architecture industry, furnishing and automotive fields, China has become a big producer of metal wire products in the world. However, the major production mode of metal wire forming discovered through market research is labor-intensive, inefficient and inaccurate in our country and goes against the concept of “high efficiency, high p...学位：工学硕士院系专业：物理与机电工程学院机电工程系_机械制造及其自动化学号：1992008115291

Study on the Reduction of Supported Noble Metal Ions Using Bacteria

负载型贵金属离子细菌还原的探索研究傅锦坤于新生林种玉胡荣宗（固体表面物理化学国家重点实验室厦门大学化学系厦门361005）刘月英姚炳新翁绳周（厦门大学生物学系厦门361005）生物化学法制备高分散度贵金属（rH、PT、Pd、Ag、Au）催化剂的研究中...The Gram positive bacteria strain D01 selected From various samples, are possessed of the stronger reducing ability. Its culture was easy. Supported Rh 3+ , Pt 4+ , Pd 2+ , A + g, Au 3+ could be adsorbed and reduced by this bacteria.The results obtained by IR techniques shown that there was the biochemistry action between the bacteria and the noble metal ions. Using the cyclic voltammograph method indicated that the reducing ability of the bacteria were stronger. XPS experiments Further indicated above noble ions could be reduced by this bacteria with diFFerent degree, the reduction did not be inFluenced by the kinds of noble metal ions and supports. The results shown that the properties of redox of above noble metal ions For electron transFer were the same. The preparation of Au catalyst with high dispersion ( Au 0 For nanometer particles ) on (Fe 2O 3)was also studied.国家自然科学基金（风险基金）;固体表面物理化学国家重点实验室基

Homing Research and Realization of Wire Bending Robot

介绍了一种在数控加工中实现高精度机械回零的方法,其为基于PMAC开放式运动控制卡回零模块,并结合非接触式接近开关限位来完成的,通过在弯丝机器人的应用表明,该方法显著提高各数控轴的自动回零精度,同时也提高了零件加工精度,保证了产品的生产效率和生产成本。The paper introduced a new method which can realize home in CNC manufacturing precisely.It was achieved by combining with PMAC(Open movement controller) and non-contact proximity switch.This method not only significantly improved the operation precision of mechanical returning home,but also enhanced the machining accuracy,production efficiency and products quality.The method had been successfully applied to wire bending robot

The chemical composition of marine aerosol over Zhongshan Station in Antarctica and its sources discrimination in 1998

从1998年3月7日至1999年3月2日历时12个月,在南极中山站连续采集52个海洋气溶胶样品,提供全部样品的13种化学元素铜、铅、锌、镉、铁、铝、锰、铬、钒、钾、钠、钙、镁含量的实测值.研究表明中山站气溶胶化学成分的含量具有季节性变化的特征.通过富集因子、相关分析、因子分析等方法判别中山站气溶胶化学成分的来源.Fifty two aerosol samples of 6~7 d duration were collected from March1998 through March1999 at the Zhongshan Station in Antarctica. The content of 13 chemical elements is presented:Cu,Pb,Zn,Cd,Fe,Al,Mn,Cr,V,K,Na,Ca and Mg. The study results demonstrate that the content of elements in marine aerosol at the Zhongshan Station appeared to be characteristics of seasonal variation, which were related to features of meteorological element. Meanwhile sources of the elements in the marine aerosols are discriminated using methods of enrichment factor, correlation analysis and factor analysis.国家自然科学基金资助项目(49976022)

Chemical composition of marine aerosolin Western Pacific East Indian Ocean Southern Oceanand Prydz Bay and its source discrimination

1999年11月至2000年4月,在中国第16次南极科学考察往返航线上的海域,采集了22个海洋气溶胶样品,用原子吸收分光法测定了样品中的Cu、Pb、Zn、Cd、Fe、Al、Mn、Cr、V、K、Na、Ca、Mg等13种元素的含量.研究表明气溶胶重金属微量元素的分布具有明显的地理区域性.应用元素富集因子、相关分析和因子分析等方法研究了西太平洋、东印度洋、南大洋、中国南极中山站邻近海域气溶胶中各元素的来源.Twenty two aerosol samples were collected during the Sixteenth Chinese Antarctic Research Expedition from Nov. 1999 to Apr. 2000. These samples were analyzed by AAS for 13 chemical elements, i.e. Cu,Pb,Zn,Cd,Fe,Al,Mn,Cr,V,K,Na,Ca and Mg. The results show that the spatial variability of the heavy metal trace elements in aerosol in the studied area display a significant geographical pattern. Source discrimination of the elements in the marine aerosol was discussed using the methods of enrichment factor, factor analysis and correlation analysis.国家自然科学资助项目(49976022

Duct Segmentation Method Based on Seed Region Growing Algorithm

目的:对CT片中的胆管进行分割。方法:采用图像分割技术中的种子区域增长法,首先,选取种子点,得到种子点所对应CT值和相邻26个点均值,然后以种子点所在位置为起点往其临近26点扩散。若其临近点CT值与种子点CT值差值在正负10个Hu或者均值满足相同要求则该点为同类点,依次类推,直到不再有同类点时算法结束。结果:自动分割的准确率>80%,计算误差 80%,computation error < 10%.Condusions:seed region growing method can be used to automatically segment bile duct in the film CT.国家自然科学基金项目资助(编号:61271336;61327001)~

The chemical composition of aerosol over Zhongshan Station in Antarctica and its sources discrimination

从1998年3月7日至1999年11月23日历时21个月,在南极中山站连续采集89个海洋气溶胶样品,本文提供全部样品的13种化学元素Cu、Pb、Zn、Cd、Fe、Al、Mn、Cr、V、K、Na、Ca、Mg含量的实测值.研究表明中山站气溶胶化学成份的含量具有季节性变化的特征.通过相关分析、因子分析、富集因子等方法判别不同时间段中山站气溶胶化学成份的来源.Eighty nine aerosol samples of 6～7 days duration were collected from Mar. 1998 through Nov. 1999 at Zhongshan Station, Antarctica. This article present the content of thirteen chemical elements: Cu,Pb,Zn,Cd,Fe,Al,Mn,Cr,V,K,Na,Ca,Mg. This study have demonstrated that the content of elements in aerosol at Zhongshan Station appeared to be characteristics of seasonal variation, which were related to features of meteorological element. Meanwhile discussion of sources discrimination of the elements in the marine aerosols during defferental time duration using methods of factor analysis, correlation analysis and enrichment factor.国家自然科学基金资助项目(49976022

Mapping the morphological identifiers of distinct conformations via the protein translocation current in nanopores

Conformational changes of proteins play a vital role in implementing their functions and revealing the underlying mechanisms in various biological processes. It is still challenging to monitor protein conformations with temporal fingerprints of current-resistance pulses in the nanopore technique. Here the low-resolution morphologies of different conformations of a typical integrin, alpha(x)beta(2), were estimated via relative blockade currents simulated from all-atom molecular dynamics (MD). Distinct conformational states of alpha(x)beta(2) were directly explained by the volume and shape identifiers. Protein modulation in ionic current was analyzed from the conductivity distribution inside the protein-blocked nanopore. Combining a discrete model with spheroidal approximation, a MD-based approach was developed to theoretically predict the volume and shape of the nanopore for sensing alpha(x)beta(2). This method was also applicable in specifying morphological identifiers of six other proteins, and the theoretical predictions are in good agreement with the experimental measurements. These results potentiated the validity of this method for the conformational identification of proteins in nanopores