火焰原子吸收光谱法连续分析硝酸钴中铜、铁、锰、锌含量

采用火焰原子吸收光谱法（FAAs）连续分析镉镍电池浸渍用硝酸钴中铜、铁、锰、锌含量,同时对样品中的干扰因素等进行了综合考察。实验结果表明,该方法具有灵敏度和重现性很好、分析步骤简单、操作容易、干扰少等特点。相对标准偏差均小于1．0％,回收率均在97．0％～101．0％之间。该法适用于硝酸钴中铜、铁、锰、锌含量控制分析和样品系统分析。     

火焰原子吸收光谱法连续测定浸渍液铜、铁、钙、镁

空气-乙炔火焰原子吸收光谱法连续测定浸渍液中铜铁钙镁是一种非常有效的仪器分析方法，具有很好的灵敏度、选择性和重现性，干扰少，操作简便等优点。对样品进行测定，铜铁钙镁的相对标准偏差均小于1．0％(n=8)；标准加入回收率均在97．0％～103．0％(n=6)范围内。方法的精密度和准确度完全适用于浸渍液铜铁镁含量的控制分析和样品系统分析。     

基体匹配——火焰原子吸收法测定钴酸锂中杂质元素

本文采用标准系列钴酸锂基体匹配,用1＋1盐酸溶解,在1％的盐酸介质中,用火焰原子吸收法,测定了钴酸锂中钾、钠、钙、镁、铜、铅、锌、铁、锰、镍等微量杂质含量。通过试验,确定了溶剂和介质的用量;对释放剂SrCl,的加入量进行了实验,选择了最佳加入量;对溶剂和样品中的共存元素进行了干扰实验。各元素的检出限分别为：钾：0．005μg／mL,钠：0．004μg／mL,钙：0．009μg／mL,镁：0．005μg／mL,铜：0．005μg／mL,铅：0．019μg／mL,锌：0．009μg／mL,铁：0．0151μg／mL,锰：0．005μg／mL,镍：0．012μg／mL,样品加标回收率在98—104％之间,相对标准偏差（RSD）为：0．96-9％,方法简便、快捷,仪器低廉,易于普及,适于钴酸锂中的微量元素检测。     

富氧空气—乙炔火焰原子吸收光谱法测定钼

试样中含2％磷酸和0．5％磷酸氢二钠，在富氧空气－乙炔火焰的条件下，可有效地抑制干扰，当测定2μg/ml钼时，100μg/ml铜、钙、铁、锰、镍等元素均不影响测定。方法的检出限为0．01μg/ml，灵敏度为0．085μg/ml，其精密度（RSD）为0．2％，方法可适用于钨制剂中钼的测定。     

富氧空气－乙炔火焰原子吸收光谱法测定钼

试样中含2％磷酸和0．5％磷酸氢二钠，在富氧空气-乙炔火焰的条件下，可有效地抑制干扰，当测定2μg／ml钼时，100μg／ml铜、钙、铁、锰、镍等元素均不影响测定。方法的检出限为0．01μg／ml，灵敏度为0．085μg／ml，其精密度(RSD)为0．2％，方法可适用于钨制剂中钼的测定。     

N2O-C2H2火焰原子吸收光谱法测定高温镍基合金中钼

研究与运用N2O-C2H2火焰原子吸收光谱法进行高温镍基合金中含钼量的测定。介绍了钼最佳测定条件及呈良好线性范围的浓度。同时对样品消化处理条件及在测定中样品的干扰因素进行了综合考虑。其方法的相对标准偏差小于1．0％，回收率均在97．0％-100．0％范围内，适用于高温镍基合金中钼的分析。     

原子吸收光谱法则定奶粉中铁、镁、锰等元素的含量

本法采用湿消解法处理样品,一次处理可测定钾、钠、钙、镁、铁、锰6种元素,在测定钙、镁时需加氯化镧作为释放剂。各元素检测限优于GBW5413．21标准要求。回收率在98％～102％之间。本方法准确可靠,特别适合于批量测定。     

高碘酸钾分光光度法测定火法冶炼镍基体料中锰

通过考察试料消解、波长选择、磷-高混酸比例及加入量、高碘酸钾加入量及煮沸时间、共存元素铁、铬、镍、钴干扰等试验条件,建立了高碘酸钾分光光度法测定火法冶炼镍基体料中锰的分析方法.样品回收率在99.5％～ 101％之间,精密度在1.0％以内,试料分析结果与ICP-AES法分析结果相符.该方法应用于火法冶炼镍基体料中锰的测定,精密度和准确度可满足实际测试工作的要求.     

N2O-C2H2火焰原子吸收光谱法测定变形钛合金中铁

提出运用N2O-C2H2火焰原子吸收光谱法测定太阳电池材料用变形钛合金中铁含量。建立了铁的分析线,燃烧器高度,酸性介质等最佳实验条件。同时对样品的消化处理条件,在测定中样品干扰因素进行了综合考虑。该方法具有很好的灵敏度,具有方法步骤简单、操作容易、干扰少等特点。铁量在1．0～10mg／L范围内与吸收值呈良好的线性关系,其相对标准偏差均小于1．0％（n=10）,标准加入回收率均在97．0％～99．0％（n=6）范围。适用于太阳电池材料用变形钛合金中铁的质量控制分析和样品系统分析。     

微波消解-ICP-MS法同时测定营养素补充剂中20种元素

建立了微波消解-电感耦合等离子体质谱(ICP-MS)法测定营养素补充剂中铜、铁、锌、锰、钙、镁、钾、磷、锶、钼、镍、钒、硒、锡、铬、铅、镉、砷、汞和锑共20种营养及有害元素的分析方法。通过对微波消解条件、质谱条件的优化、内标物的选择,克服高盐复杂基体对痕量元素测定的干扰,选择高浓度元素的低丰度质量数扩大线性范围。结果表明,铜、锌、铁、锰、钙、镁、钾、磷在0~50mg/L、汞在0~10μg/L、其他元素在0~50μg/L线性良好,相关系数在0.9992~1.0000之间,方法检出限为0.021μg/kg~21μg/kg,方法精密度为0.8%~5.7%。用该方法测定国家标准物质奶粉GBW(E)10017和芹菜GBW10048,测定结果与标准值无显著差异。方法简便、快速,可实现多种样品中含量在1%以下的主、微量元素同时测定。     

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.     

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。     

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....     

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.