中草药添加剂对猪育肥效果研究

试验选用杂交猪60头,分为3组,每组20头,以生猪空腹质量为依据,随机编组。试验组饲喂基础日粮加不同剂量3%中草药预混剂,对照组饲喂基础日粮加常规饲料添加剂。试验进行60d。测定试验各组增长及饲料消耗变化。试验结果表明:添加3%中草药预混剂的试验组比对照组日增长率19.81%,收益平均提高22.38%,值得推广。     

淡水底栖硅藻对刺参的饵料效果

采用淡水底栖硅藻舟型藻(Navicula sp.)和刺参专用配合饲料投喂刺参(Apostichopus japonicus),经过45天的生长后测定两组刺参的成活率分别是99.57%、83.83%,平均生长率是4.3%、-27.7%,用流式细胞仪测定两组刺参体腔液细胞的吞噬活性分别是15%和4%.证明新鲜淡水底栖硅藻的饵料效果优于此配合饲料.     

氢化物发生原子荧光光谱法测定饲料中硒

本文建立了氢化物发生原子荧光光谱法测定饲料中硒,对各种不同饲料中铜、铁干扰离子,采用铁氰化钾做掩蔽剂,以及选择最佳的酸度和硼氢化钾浓度等仪器参数。本法线性范围为0- 400ng/mL,相关系数大于0.999,方法检出限为O.1ng/mL,加标平均回收96%。     

电感耦合等离子体发射光谱法测定饲料中稀土元素镧和铈

本研究建立了应用电感耦合等离子光谱法(ICP-AES)同时测定饲料中稀土元素镧(La)和铈(Ce)的方法。采用混酸消解试样,选择了最佳激发条件,在优化条件下,La和Ce检出限分别为0.6和0.8μg/L,样品的加标回收率在97%～104%之间,相对标准偏差(RSD)≤3.3%。将该方法用于预混合饲料和配合饲料样品中稀土元素La和Ce的测定,方法简便、快速,结果令人满意。     

HPLC法测定饲料中已烯雌酚的关键点控制

介绍了用高效液相色谱法（HPLC）测定饲料中己烯雌酚的一些注意事项，并从线性范围、样品提取和净化、色谱条件等几个关键点进行了优化。通过此方法可以快速、准确地对配合、浓缩和预混合饲料中己烯雌酚进行测定。     

高效液相色谱测定焙烤食品中6种甜味剂

建立了高效液相色谱测定烘烤食品中6种甜味剂的分析方法。样品用5%甲醇水溶液提取离心，采用二极管检测器测定安赛蜜、糖精钠、阿斯巴甜、纽甜、甜菊糖苷，蒸发光检测器测定三氯蔗糖。除三氯蔗糖外，其他5种甜味剂在1～50μg/mL的浓度范围内呈线性关系，三氯蔗糖在10～500μg/mL范围内呈幂函数关系；6种甜味剂相关系数均大于0.999；平均回收率为80.3%～99.8%,相对标准偏差为0.6%～5.8%。该方法前处理简单，准确度高，重现性好，适用于焙烤食品中6种甜味剂的测定。     

饲料中盐酸克仑特罗检测方法研究

阐述了饲料中盐酸克仑特罗的HPLC及GC－MS的测定方法。说明了测定各环节（提取、净化、测定）中主要实验条件和测定参数的确定依据以及最后方法的性能检验结果。两种方法的前处理方法相同，应用中HPLC法可作为一般定量测定方法，其最低检测限0.5ng（称样量为5g时，最低检测浓度为0.05mg/kg），配合饲料在0.05mg/kg-8.00mg/kg范围内r=0.9940；GC－MS作为仲裁法，其检测限为0.025mg/kg(取样5g时，最低检测浓度为0.01mg/kg），配合饲料在0.05mg/kg-4.00mg/kg范围内，r=0.9998。现在两种方法均已作为农业部部颁标准颁布实施。     

离子色谱法快速测定鱼预混饲料中的肌醇

采用离子色谱技术快速测定鱼预混饲料中肌醇的含量。该方法具有试样制备简单，分析干扰少，速度快，结果准确等特点。     

氢化物发生-原子荧光法测定饲料中的砷

研究了饲料总砷测定中现有标准消解方法和氢化物发生-原子荧光法衔接中相关酸介质及其浓度的影响、预还原掩蔽剂的选择、预还原反应时间以及饲料、特别是预混合饲料中所可能添加大量的钙、铜、铁、锰、锌、硒等的干扰，最后探讨不同消解方法，消解条件或实验参数的影响，发现了一些问题，进行了改进，指出了关键点控制要素和实际工作中应注意的一些问题。     

盐湖水中锂同位素丰度比值的质谱法测定

采用ZhT1301型质谱计测定盐湖水中的锂同位素。文中报告了锂的离子交换分离方法,详细地研究了影响锂同位素比值测定的因素,本实验中单次测定的平均精度为±0.12%,最佳可达±0.04%,次间的测定精度为±0.20%。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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...