超高效液相色谱-串联质谱法同时测定环境水体中3种典型“三高”药物残留

建立了超高效液相色谱-三重四级杆串联质谱(UHPLC-MS/MS)同时测定地表水和污水中3种典型"三高"药物硝苯地平、格列吡嗪和吉非罗齐的分析方法。水样采用Oasis HLB小柱,通过固相萃取方式进行富集、净化,经甲醇/二氯甲烷/乙酸乙酯洗脱后,UPLC-MS/MS进行检测。硝苯地平、格列吡嗪和吉非罗齐在标准曲线溶液中的线性相关系数r2分别为0.9989、0.9996和0.9998。对于地表水样品,3种目标药物的回收率范围分别为95%～103%、111%～126%和91%～98%,检测限(MQLs,S/N10)范围为0.13ng/L～0.79ng/L,基质效应范围为-3.2%～13%;对于污水样品,3种目标药物的回收率范围分别为71%～80%、87%～113%和105%～112%,MQLs范围为3.35ng/L～6.32ng/L,基质效应范围为-14%～19%。方法应用于环境污水样品,检测出硝苯地平浓度为8.7ng/L。本方法灵敏可靠,可用于环境水体中典型"三高"药物的多残留筛查与痕量检测。     

微波消解-原子吸收光谱法测定酵母中的微量铜铅锌铁锰

采用微波消解-原子吸收光谱法对酵母中铜、铅、锌、铁、锰5种微量元素进行了测定.考察了微波消解条件(微波加热压力、消化时间),测定的线性范围及硝酸、过氧化氢用量的影响.在选定的实验条件下,对酵母粉样品中的5种微量元素分别进行了测定,相对标准偏差为0.54%～36.5%(n=9),加标回收率为98.8%～101.2%.方法简便快速,结果准确,重现性好.     

高效液相色谱法测定红辣椒制品中的苏丹红

建立了一种测定辣椒样品中苏丹红染料的高效液相色谱方法.采用乙腈提取红辣椒样品,C8作为固定相,含0.1%甲酸水溶液作为流动相,流速为1.0mL/min,紫外检测波长为472nm,柱温20℃,进样量为20μl.在0.05μg/ml～2.5μg/ml的浓度范围,苏丹红Ⅰ,Ⅱ,Ⅲ,ⅣV各组分的峰面积与其质量浓度的线形关系良好.辣椒制品提取液回收率测定范围为90.1%～105.6%,苏丹红的检出限在0.01ug/ml～0.02ug/ml之间.     

圆管式及方槽板式脉动热管的比较

对圆管式及方槽板式脉动热管试验进行了结构及运行特性的比较.分析表明,与圆管式脉动热管相比,方槽板式脉动热管存在尖角的毛细吸附力以及相邻槽道通过薄壁的横向热平衡.这些结构因素影响脉动热管的运行特性.试验表明,在水平及垂直顶部加热模式下,两种热管的最佳充液率范围相同,均为40%～70%;在垂直底部加热模式下,圆管式脉动热管的最佳充液率范围是30%～70%,而方槽板式脉动热管的最佳充液率则为15%.     

高效液相色谱法测定水果中的抗坏血酸

用高效液相色谱法测定了几种水果中的维生素C,并研究了不同的色谱条件、不同的提取液对测定结果的影响,结果表明用0.25%的偏磷酸浸提样品以及作为流动相效果较好,测得Vc的保留时间为4.35,回收率为92%～98%,线性范围0.0001～1.68mg/ml.     

离子选择电极法测定轻烧镁中氟

轻烧镁试样用微波、盐酸冷溶解、盐酸热溶解、超声溶解 4种方式溶解 ,以柠檬酸钠为抗干扰剂 ,并以其和盐酸等作为总离子强度调节缓冲剂 ,在 p H值为 6的酸度下 ,用氟离子选择电极进行测定。线性范围 0 .1～ 1 .0 μg/g。用以测定含氟 0 .0 0 5 0 %～ 0 .1 %的轻烧镁 ,回收率在 92 %～ 1 0 8.7%之间。操作简便易行 ,结果令人满意     

高效液相色谱法检测两种苯氧乙酸类除草剂

建立了高效液相色谱测定两种被确定为内分泌扰乱化学物质的苯氧乙酸类除草剂的分析方法。实验采用ZORBAXSB C18(2 .1mmi.d .× 15 0mm ,5 μm)色谱柱分离 ,二极管阵列检测器 (PDA)在波长 2 90nm检测。两种农药的线性范围均为 0 .2ng～ 10ng ,检出限为 0 .0 4mg/L。实际样品加标回收率在 81.8%～ 89.9%之间 ,相对标准偏差在5 .6 6 %～ 12 .0 0 % (n =7)之间。该方法灵敏可靠、快速、简便、重现性好。     

导电弹簧材料

专利申请的范围:1.含 Sn3.0～9.0%(重量%,下同)B0.01～0.3%、余量为 Cu 的导电弹簧材料。2.含 Sn3.0～9.0%、P0.01～0.35?.01～0.3%、余量为 Cu 的导电弹簧材料。发明的详细说明:     

乳粉中α-亚麻酸气相色谱法测定方法及其不确定度的评定

本文介绍了一种用气相色谱法测定乳品中α-亚麻酸的分析方法,方法简便、快速,同时可以进行亚油酸的测定,方法的检出限为0.33ng,线性范围是0.550～91.0ng,回归方程是A=126889c+150.63,加标回收率在90.3～106.5%.并且讨论了使用本方法测定α-亚麻酸分析结果的不确定度,不确定度为5.6%.     

反相高效液相色谱同时测定动物营养液中B族维生素

建立了反相高效液相色谱法同时测定动物营养液中四种B族维生素的方法。采用AichromBond-AQC18(4.6mm×250mm,5μm)柱,以甲醇-缓冲盐溶液为流动相梯度洗脱,二极管阵列检测器(DAD)三波长下测定。回收率的范围81.6%～101.5%,相对标准偏差(RSD)范围0.92%～1.96%。     

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...