LB技术制备的ZrO2纳米薄膜摩擦学行为

在单晶硅表面制得花生酸锆hngmuir—Blodgett薄膜，对该薄膜在500℃条件下热处理30min，得到致密ZrO2薄膜。利用AFM，XPS，SEM对其结构和形貌进行表征，摩擦磨损试验结果表明，利用该方法制备的ZrO2薄膜表现出良好的减摩抗磨性能。     

陶瓷-玻璃-单晶硅的阳极键合工艺性研究

首先采用射频磁控溅射法在ZrO2陶瓷基体上沉积一层钠硼硅酸盐玻璃，并通过该钠硼硅酸盐玻璃薄膜作为中间层利用阳极键合方法实现了ZrO2陶瓷与单晶硅的间接连接。     

中频对靶反应磁控溅射Al2O3、TiO2、ZrO2功能薄膜的特性研究

利用中频对靶磁控溅射技术,分别制备出厚度低于5 μm、表面光滑的TiO2、ZrO2、Al2O3 3种功能薄膜.研究了不同工艺条件下薄膜的成膜速率和表面形貌,用四探针法测量了材料的薄膜电阻,并表征了膜层材料在大气压热等离子射流急速加热条件下的抗热冲击特性.     

阳极焊过渡层钠硼硅系玻璃薄膜的制备

采用射频磁控溅射法在ZrO2陶瓷衬底上制备钠硼硅系玻璃薄膜,目的是以这层薄膜作为过渡层实现ZrO2精细陶瓷与单晶Si之间的阳极焊,通过XRD、EDS和SEM等测试手段对薄膜的物质结构和化学成分进行了多方面的分析,结果表明这种工艺是可行的.     

氨基表面组装薄膜的构筑及其微观摩擦学特性

以二乙烯三胺基丙基三甲氧基硅烷(TA)作为分子底层,采用两步组装的方法在单晶硅基底表面制备一系列相同结构不同分子链长的自组装双层薄膜。利用椭圆偏光测厚仪、接触角测定仪、原子力显微镜(AFM)等对薄膜的形成及微观摩擦力进行表征。研究结果表明,低表面能的疏水性末端基团有利于降低薄膜的摩擦力和摩擦因数;组装分子碳链长度的增加有助于形成有序性强和致密度高的组装薄膜,从而减小薄膜表面的摩擦力和摩擦因数。     

Ag掺杂对TiO2纳米薄膜结构及摩擦学性能的影响

采用溶胶凝胶法在普通载玻片上制备了TiO2和Ag/TiO2纳米结构薄膜,利用X射线衍射仪(XRD)、X光电子能谱(XPS)、原子力显微镜(AFM)及UMT-2摩擦试验机,考察了Ag掺杂量对薄膜组成结构、表面形貌及摩擦学性能的影响。实验结果表明,Ag掺杂量对TiO2薄膜表面形貌和减摩抗磨性能产生重要影响,低掺杂时Ag自润滑性能对薄膜摩擦性能的增强作用占主导,而高掺杂时其对薄膜的影响主要表现为恶化表面,从而导致摩擦性能下降。本研究测试条件下,掺杂量为5.0%(摩尔分数)时具有最佳的耐磨寿命和最低的摩擦因数。     

自组装技术制备稀土Y润滑薄膜的研究

结合自组装技术在羟基化处理的Si表面成功制备了稀土Y薄膜。利用SEM,AFM,XPS对其结构和形貌进行表征,在UMT-2摩擦磨损试验机上考察了稀土Y薄膜的摩擦磨损性能,并探讨了该薄膜的摩擦润滑机制。结果表明,利用该方法制备的稀土薄膜致密、均匀,由排布紧凑的小颗粒组成,具有良好的减摩耐磨特性。     

基于分子自组装导电聚合物的仿生嗅觉传感薄膜制备

基于层接层分子自组装技术,利用导电聚合物聚噻吩(PT)、聚苯胺(PAN)和聚吡咯(PPY)建立了一种仿生嗅觉传感薄膜分子模型,使PT、PPY和PAN的原位聚合导电高分子形成聚阴离子或聚阳离子,并交互沉积进行自组装,生成多层薄膜.这种薄膜能在0.01 cm2的面积上集成一定数目的嗅觉分子传感器,理论上可以对不同的气味分子产生相应的响应信号.     

MoS_2基复合润滑薄膜的制备及其摩擦性能

采用磁控溅射法在不锈钢基体上制备了MoS2/Ni复合润滑薄膜,研究了添加DLC(类金刚石薄膜)中间层对于MoS2/Ni复合薄膜的影响,探讨了复合润滑薄膜的减摩机理;使用EDS与XRD测定了复合薄膜的主要成分和物相结构,使用多功能摩擦试验机测定了薄膜的摩擦因数.结果表明:复合薄膜的主要成分为MoS2和Ni;薄膜中主要晶面为平行于基面的(002)晶面;复合薄膜的摩擦因数在0.06～0.18之间变化,且在高速重载的环境下具有更低的摩擦因数和更高的摩擦稳定性;中间层的加入进一步降低了复合薄膜的摩擦因数,达到0.04左右.     

化学织构化硅表面OTS自组装膜形貌及性能表征

用40%NH4F对Si(100)表面进行化学织构化,然后用十八烷基三氯硅烷(OTS)进行分子自组装,在织构化表面谷底区域形成液体凝聚(LC)相分子薄膜。织构化表面的典型山丘直径约30 nm,高约7 nm;典型的LC相OTS单层膜原子力显微镜(AFM)厚度约2.3 nm。随着反应时间的延长,OTS薄膜的LC相面积覆盖率逐渐增加,30m in后达到70%左右的平衡值。OTS组装8 min后的表面静态接触角即达108°左右,且表面接触角不再随反应时间的延长或LC相面积覆盖率的增加而明显变化。组装的OTS薄膜能显著改善织构化硅表面的摩擦学性能。     

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.