溶胶-凝胶法制备纳米SiO2超细粉体

利用阴、阳离子交换法制备了能长期稳定存在的、粒径可控的、高浓度的硅溶胶，并通过溶胶-凝胶法制备了纳米SiO2超细粉体。通过在凝胶过程中滴加稳定剂的方法成功地解决了SiO2颗粒的团聚问题，为下一步制备高聚物/无机物纳米复合涂层创造了条件。     

镁合金热化学反应法Al2O3基纳米陶瓷涂层的耐蚀性能研究

介绍了采用热化学反应法在MB2镁合金表面制备纳米陶瓷涂层，主要研究了涂层的耐蚀性，采用XRD分析其相结构，并测试涂层耐热冲击性，结果表明，该涂层的耐酸性及耐盐性相对于基体提高了13．4及13．7倍，耐热冲击性达30次以上，且涂层中有新相MgMnSiO4，Al2SiO5，Mg2SiO4和ZnAl2O4生成。     

TiAlN／SiO2纳米多层刀具涂层的微观结构和超硬效应研究

通过磁控溅射方法制取了一系列不同SiO2厚度的TiAlN／SiO2纳米多层涂层,并用X射线衍射仪（XRD）、扫描电镜（SEM）、高分辨透射电镜（HRTEM）和纳米压痕仪分别对该涂层的微观结构和力学性能进行了表征和测量。研究表明：当非晶态的SiO2厚度约小于1nm时,SiO2在TiAlN模板作用下转变为晶体结构,并与TiAlN呈共格外延生长,出现超硬效应;当SiO2厚度为0．6nm时,其硬度和弹性模量分别高达37GPa和393GPa;当SiO2厚度超过lnm时,SiO2逐渐转变为非晶结构并且破坏了多层涂层的共格外延生长,硬度随之降低。因此,可以利用该方法制备出机械性能好且耐高温氧化性的刀具涂层,以满足现代切削的需要。     

镁合金热化学反应法A12O3基纳米陶瓷涂层的耐蚀性能研究

介绍了采用热化学反应法在MB2镁合金表面制备纳米陶瓷涂层,主要研究了涂层的耐蚀性采用XRD分析其相结构,并测试涂层耐热冲击性,结果表明,该涂层的耐酸性及耐盐性相对于基体提高了13.4及13.7倍,耐热冲击性达30次以上,且涂层中有新相MgMnSiO4,Al2SiO5,Mg2SiO4和ZnAl2O4生成.     

微纳米二氧化硅颗粒协同改性丙烯酸树脂及其摩擦学性能

采用硅烷偶联剂KH550改性前后的微/纳米二氧化硅（SiO2）颗粒对丙烯酸树脂进行改性,采用傅里叶红外光谱仪（FT-IR）对树脂固化结果进行表征;用线性涂布器在铸铁表面制成微/纳米SiO2-丙烯酸树脂复合涂层,采用摩擦试验机R tec、表面轮廓仪和扫描电子显微镜分别测试涂层的摩擦因数、磨损率和磨痕形貌。结果表明：改性后SiO2对于涂层性能的增强均优于未改性SiO2,改性纳米SiO2提高涂层在干燥条件下的摩擦磨损性能,但对其在海水存在条件下的摩擦性能没有明显的影响;改性微米SiO2提高涂层的抗磨损性,但对摩擦因数影响不大;改性微纳米SiO2协同改性的涂层,在干燥条件下具有良好的摩擦磨损性能,但在海水存在条件下的摩擦磨损性能不如单组份SiO2改性丙烯酸树脂涂层。     

溶胶-凝胶法在吸收剂表面制备SiO2涂层

用溶胶-凝胶法在多晶铁纤维和炭黑吸收剂的表面分别制备了SiO2涂层，考察了SiO2涂层对吸收剂电磁参数和吸波性能的影响。试验结果表明，多晶铁纤维涂覆SiO2涂层后，表面电导率大大下降，改善了匹配性能，吸波性能得到明显的提高。炭黑表面涂覆SiO2涂层后，介电常数显著下降，高频吸波性能得到明显改善。     

纳米二氧化硅提高聚四氟乙烯复合材料硬度的研究

通过溶胶凝胶法和热压烧结，制备了纳米SiO2／PTFE复合材料。用XRD分析了纳米SiO2对PTFE结晶度的影响，用SEM对其断口形貌进行了分析，并与机械混合法制备的复合材料进行了对比。结果表明：采用溶胶凝胶法制备的复合材料，纳米SiO2粒子可以较均匀地分散在基体中，提高了复合材料的硬度，降低了其结晶度。     

纳米高温耐磨复合涂层的性能研究

利用纳米材料高的比表面能和表面活性开发电站高温耐磨涂料。试验在普通粉料FM650中添加纳米材料制成涂料，对涂层的结合强度、耐磨性和热震性分别进行了试验。结果表明：FM650涂层的结合强度从2.90MPa提高到了3.49MPa采用单面涂层降低气孔的影响则涂层强度从6.26MPa提高到了10.43MPa；耐磨性和致密性均有很大提高；纳米Al2O3/SiO2的加入改善了涂层与钢的膨胀系数匹配程度，不经低温80℃/150℃处理涂层仍具有良好的耐热震性能。     

聚苯硫醚/氟树脂梯度防腐蚀涂层的研究

在碳钢表面制备了具有梯度结构的PPS／FEP复合防腐蚀涂层，采用拉开法测定了各涂层体系的结合强度。结果表明：PPS／FEP梯度防腐蚀涂层明显改善了单纯氟树脂涂层对金属的不粘性，PPS／FEP五层梯度结构涂层与钢基体的结合强度可达11．8MPa；电子探针分析结果显示，五层体系中各组分沿横截面呈连续梯度分布，有效加强了层问结合。     

纳米和微米SiO2颗粒对PPESK复合材料摩擦学性能的影响

用热压成型法制备了纳米、微米SiO2填充聚醚砜酮(PPESK)复合材料，考察了复合材料的硬度和抗弯强度，并研究了干摩擦条件下纳米、微米SiO2颗粒对复合材料摩擦磨损性能的影响，用扫描电镜观察分析了复合材料磨损表面形貌及磨损机理。结果表明：干摩擦条件下，纳米SiO2填充PPESK主要是轻微的磨粒磨损；而微米SiO2填充PPESK主要是严重的磨粒磨损。     

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.     

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。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.     

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...