液压缸集成位移传感器信号调理电路设计

针对常见液压缸位移传感器在高集成、小体积环境的应用缺陷,开展了一种高集成液压缸位移传感器信号调理电路的设计研究。为获取高质量的位移检测信号,在分析了位移传感器原始信号特征的基础上,开展了直流隔离、放大、电源转换以及滤波电路等信号调理电路的研究。电路的有效性通过Multisim和Proteus进行仿真及实验验证,仿真及实验结果表明,该信号调理电路可将位移传感器原始信号转变为标准的简谐信号,便于信号的后续采样细分,为提高液压缸位移的检测精度提供了支撑。     

电子束扫描线圈高速驱动器研制

针对电子束高速偏转扫描的需要，研制了一种用于驱动电子束扫描线圈的高速驱动器。具体为通过降压、补偿、差分输入的方式设计驱动器输入级电路，提高电路对高速信号的响应及处理速度；通过射极跟随方式设计电流闭环调节电路，提高电路的闭环调节速度及稳定性；通过Cadence仿真软件对主回路结构仿真设计及参数优化。根据上述结果，研制出了电子束扫描线圈高速驱动器，并对其进行测试。结果表明，其驱动感性负载时，输出电流可高速闭环响应任意输入信号，工作频率达100 kHz，最大驱动电流±2 A。     

电压／电流／电压变换电路

某数控装置的输入信号为远距离现场传感器的电压信号。我们知道，电流传输回路由于电流恒定，可以很好地抑制外来杂散电压信号的干扰和噪声，所以远距离信号的传输需要采用电压／电流／电压变换电路。现场传感器输出的电压信号ui经电压／电流变换电路，成为具有恒流源特性的电流信号输出，而后在接收端再由电流／电压变换电路变换成电压信号W，作为数控装置的输入信号。见图1，A、乌、身为集成运放De324，S；和a为集成模拟开关CD4O66，组成发送端压控式电压／电流变换器。人及外围元件组成接收端电流／电压变换器。要求在0＜山＜此时，执…     

7CM系统数控机床的接口诊断与故障实例分析

数控机床的接口电路，一般是指数控装置（NC侧）与机床（MT侧）及机床电气控制设备之间的电气连接部分而言。按国际“IS04336一198（E）机床控制──数控装置和数控机床电气设备之间的接口规范”之规定，接口可分为四种类型。即：第一类：与驱动命令有关的连接电路。第二类：数控装置与测量系统和测量传感器之间的连接电路。第三类：电源及保护电路。第四类：通／断信号和代码信号的连接电路。由此不难看出，NC侧与MT侧之间的接口电路内容量大面广，因此，熟悉并掌握1／0接口电路的内容及检查方法，对于数控机床的故障诊断分析无疑是至…     

数字化TIG逆变焊机两种典型抗干扰设计

分析了数字化TIG逆变焊机中手柄开关和电弧电压检测两种信号传输过程中干扰的来源及其对焊机性能的影响，并针对这两种信号设计了有效的抗干扰传输电路。在手柄开关信号传输电路中，采用了下降特性的脉冲变压器以保证工作信号的传输和干扰信号的隔离；在电弧电压检测电路中采用电感电容（IJC）滤波器和线性光耦来抑制干扰并保证采集到的电弧电压的真实性。试验表明，所设计的两种电路简单可靠，实现容易，能有效抑制噪声干扰，在提高控制电路抗干扰性能方面发挥了重要作用。     

大功率弧焊逆变器峰值电流控制电路设计

针对基于峰值电流控制模式的大功率软开关弧焊逆变器。讨论了其峰值电流控制电路中峰值信号（一瞬态电流信号）检测与处理，以及斜率补偿的意义及实现方法，具体设计并实现了信号的检测、处理以及斜率补偿电路。     

8259A中断控制器在三相次级整流点焊控制系统中的应用

分析了三相次级整流点焊机主电力电路的控制过程，采用8259A中断控制器将3个同步脉冲及3个触发延迟角延时到信号等6个中断合理排队，从而解决了控制系统的时序安排问题。详细介绍了8259A与89C52单片机的接口电路及软件编程。     

激光焊接过程多传感器信号调理电路的设计

介绍了一种激光焊接声、光信号采集与信号调理电路的设计原理，并结出了相应的电路图。试验表明：该采集电路能够正确采集激光焊接过程特征信号，并能有教反映焊接过程的变化．可以满足激光焊接过程实时监测的要求。     

CO2焊短路信号和缩颈信号的获取

采用光耦6N136对电弧电压进行隔离，得到了失真很小的孤压信号，设计了短路检测电路和缩颈检测电路．并在缩颈检测电路中加入削波电路，成功地消除了燃弧电压时缩颈检测电路的影响。通过实际焊接试验，验证了所设计的短路检测电路和缩颈检测电路是成功的。     

金线焊接差异对信号传输的影响分析与建模

在超声热键合的过程中，平行键合线的间距变化常常被忽略.间距变化对高频信号传输会产生较大影响，不容忽视.文中从建模分析和试验测试两个角度研究了平行键合线距离对电路信号传输的影响.基于电路的尺寸参数和材料参数，分别建立了不同间距平行键合线的电磁场数值计算模型和等效电路模型，计算和分析了两连接点间等效电感和电阻随间距和信号频率的变化关系，研究了平行键合线距离对电路信号完整性的影响. 模型仿真和试验测试结果表明，键合线之间的互感随着键合线间距增加而下降，从而导致两连接点之间的等效电感下降，电路信号完整性提升.     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.