用快原子轰击质谱法研究醌式化合物─Idebenone

Ｉｄｅｂｅｎｏｎｅ是１种１，４－苯醌类化合物，其快原子轰击法质谱（ＦＡＢＭＳ）在不同的底物中，准分子离子是不同的。在底物甘油、硫代甘油和三乙醇胺中，准分子离子为（Ｍ＋２Ｈ）￣＋，而在底物３－硝基苯甲醇中，准分子离子为（Ｍ＋Ｈ）￣＋。     

用快原子轰击质谱研究醌式化合物Medermycin,G—15F和G—15G

Ｍｅｄｅｒｍｙｃｉｎ，Ｇ－１５Ｆ和Ｇ－１５Ｇ三个化合物都有醌式结构，在底物甘油中，准分子离子为（Ｍ＋３Ｈ）＾＋但在底物３－硝基苯甲醇（ＮＢＡ）中，准分子离子为（Ｍ＋Ｈ）＾＋，本文用ＦＡＢＭＳ对此作了研究。     

用快原子轰击质谱法研究醌式化合物—Idebenone

Ｉｄｅｂｅｎｏｎｅ是１种１，４－苯醌类化合物，其快原子轰击法质谱在不同的底物中，准分子离子是不同的。在底物甘油、硫代甘油和三乙醇胺中，准分子离子为（Ｍ＋２Ｈ）＾＋，而在底物３－硝基苯甲醇中，准分子离子为（Ｍ＋Ｈ）＾＋。     

用快原子轰击质谱研究醌式化合物Medermycin、G－15F和G－15G

Ｍｅｄｅｒｍｙｃｉｎ、Ｇ－１５Ｆ和Ｇ－１５Ｇ三个化合物都有醌式结构。在底物甘油中，准分子离子为（Ｍ＋３Ｈ）＋，但在底物３－硝基苯甲醇（ＮＢＡ）中，准分子离子为（Ｍ＋Ｈ）＋。本文用ＦＡＢＭＳ对此作了研究。     

多官能团分子质谱的研究（Ⅵ）：对称分子的正离子化学电离谱（i—C4H10）

本文测定并解析了对称型多官能团分子2，6-二甲胺甲基-4-烷基（CnH2n＋1）苯酚〔n=2（Ⅰ）、4（Ⅱ）、8（Ⅲ）、10（Ⅳ）、12（Ⅴ）]同系物的正离子化学电离谱，结果发现，由质子转移反应产生的（M＋H） 准分子峰都为基峰［（Ⅰ）～（Ⅴ）]，扣除同位素丰度后，随着羟基对位上烷链（CnH2n 1)长短的变化,(M H) 峰的相对风度仍无明显的变化,M ,(M-H) 峰为较弱丰度且与C4位上烷链(CnH2n 1)的长度变化无关,测得某些多质子离子如(M 3H) 其相对丰度随C4位上的增长而增加.     

烟草系统素多肽的质谱裂解规律研究

烟草系统素多肽是烟叶植物中系统性防御反应的信号分子,调控烟草的生长、发育和防御等整个生命周期活动。本工作采用液相色谱 线性离子阱质谱（LC-LTQ-MS）联用技术,研究3种烟草系统素多肽的质谱裂解规律。结果表明：烟草系统素多肽的准分子离子均带3~4个电荷;多肽准分子离子峰在18~25 V的碰撞电压下,主要产生b型和y型碎片离子;在离子化过程中,烟草系统素Ⅱ（TobSys Ⅱ）最强准分子离子［M+4H］⁴⁺的最优碰撞电压为20 V;烟草系统素Ⅰ（TobSys Ⅰ）和烟草系统素Ⅲ（TobSys Ⅲ）最强准分子离子峰［M+3H］³⁺的最优碰撞电压为22 V;在最优碰撞电压下,烟草系统素多肽的离子碎片信息丰富,特征离子碎片的峰强度最大,且主要在亮氨酸、羟脯氨酸和脯氨酸的氨基端进行断裂。该质谱裂解规律可为检测植物样品中的系统素提供科学依据。     

分光光度法（硫脲还原法）测定矿石及冶金渣中钼含量

M o5＋与硫氰化物作用,生成红色的络合物,颜色深浅与M o5＋含量呈线性正相关,借此进行钼的比色测定。Cu2＋和Fe3＋同时存在,对钼的硫氰化物生成有催化作用。此时,Cu2＋与硫脲生成无色络合物,Fe3＋在Cu2＋的催化下,被硫脲还原为Fe2＋,Fe3＋和Cu2＋对钼的红色络合物无干扰。方法用于矿石和冶金废渣样品分析,测定值的相对标准偏差（n＝6）在0.19％～8.6％之间,回收率在95％～105％之间。实验结果表明该方法具有灵敏度高、定性和定量准确等特点,解决了 Fe3＋和 Cu2＋在分析比色时干扰问题。此方法的原理为2M oO42－＋2CS （NH2）2＋10CNS－＋10H＋＝2[MoO（CNS）5]2 －＋2CS（N2 H3）＋6H2 O     

共沉淀法制备Ca0．6Mg0．4Zr4（P04）6纳米粉体

采用共沉淀法，以Ca（NO3）2·4H2O、Mg（NO3）2·6H2O、ZrO（NO3）2·8H2O和NH4H2PO4为原料合成Ca0．6Mg0．4Zr4（P04）6（C0．6M0．4ZP）纳米粉体，通过TGDSC、XRD、TEM和纳米粒度／Zeta电位分析手段研究了反应过程pH值、反应物浓度配比和沉淀反应方式等对合成粉体的相组成、平均颗粒尺寸及其分布等的影响。结果表明：将Ca^2＋、Mg^2＋、Zr4＋离子混合溶液加入到不同pH值的NH4H2PO4溶液中，并控制pH=3～11，沉淀物经900℃煅烧3h后，可合成单相的C0．6M0．4ZP纳米粉体；当Zr4十浓度为0．5mol／L、沉淀剂NH4H2PO4浓度为1．0mol／L、pH=9时，合成粉体平均颗粒尺寸和粒径分布范围最小，分别为40nm和20-70nm。     

Ni^＋与C6—C9直链烷烃分子束流反应的研究

将激光解离／分子束流／飞行时间质谱结合起来,设计一套简单装置,研究了激光解离的Ni 与C6～C9直链烷径分子束流的气相反应。所有反应可用以下过程解释：（1）Ni＋插入C－C或C－H键;（2）β－H迁移至Ni＋形成配合物;（3）配合物分解生成产物离子和中性分子。     

典型环亚胺类毒素大气压化学电离质谱分析

利用离子阱质谱技术分析了两种典型环亚胺类毒素（GYM和SPX1）在大气压化学电离（APCI）条件下的质谱裂解特征,并与电喷雾电离（ESI）质谱法进行了比较。GYM和SPX1在APCI一级质谱分析过程中易形成准分子离子［M+H］⁺峰（基峰）;在二级质谱分析过程中,母离子［M+H］⁺通过丢失H₂O中性碎片形成稳定的特征子离子峰;并结合三级质谱分析,推测了两种毒素的裂解途径。结果表明：大气压化学电离质谱法（APCI-MS）的灵敏度好于电喷雾质谱法（ESI-MS）;液相色谱-大气压化学电离质谱法（LC-APCI-MS²）分析4种不同基质样品中GYM和SPX1的专属性、重复性、稳定性和抗基质干扰能力均好于液相色谱 电喷雾质谱法（LC-ESI-MS²）。综上,APCI-MS法适于典型环亚胺类毒素的分析,本研究可为LC-APCI-MS定性、定量分析不同基质复杂样品中环亚胺类毒素提供参考和依据。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.