Flow Behavior of SUS304 Stainless Steel Under a Wide Range of Forming Temperatures and Strain Rates

To determine the flow behavior of SUS304 stainless steel under different conditions, axisymmetric compression tests were conducted over a wide range of forming temperatures (25 °C to 400 °C) and strain rates (10⁻³ to 10 s⁻¹). Flow curves were obtained for different forming conditions to study the influence of the forming temperature and strain rate on the flow behavior. Moreover, electron backscatter diffraction analysis, X-ray diffraction analysis, transmission electron microscopy, and Feritscope were used to study the microstructure evolution of SUS304 stainless steel under different conditions for determining the underlying reasons for the variations in flow behavior. The experimental results indicated that the flow stress decreased with increasing the forming temperature. With increasing strain rate at 25 °C to 200 °C, the flow stress first increased and then decreased; however, the strain rate had little effect on the flow stress at 300 °C and 400 °C. By analyzing the variation in the phase transformation inside compressed SUS304 stainless steel samples under different forming conditions, the key factors affecting the flow behavior of stainless steel were identified. Finally, by examining the variation in the martensite content and the dislocation density, the dominant deformation mechanism under different forming conditions was determined.

     

基于遗传算法的车间调度问题

基于遗传算法对车问调度问题进行了优化,给出了自适应的遗传算子,进行了遗传算法参数设置。采用这种编码方案、遗传算子和参数使得遗传操作大大简化,能达到有效的调度作用。最后,使用标准实例对算法有效性收敛速度进行了验证,并作了简要分析。     

基于状态码的风力发电机组可利用率计算

风力发电机组的可利用率是衡量风力发电机组可靠性的一个重要指标。目前国内使用可利用率计算方法各式各样,至今没有统一的标准。提出了一种基于风机现地控制系统状态码处理的可利用率计算方法,通过对状态码可利用属性的细化,实现了机组可利用率的精确计算。     

珊瑚状分级微纳米结构聚苯胺的制备、表征及其气敏性能研究

采用简单的阴离子表面活性剂诱导原位化学聚合法,以过硫酸铵(APS)为氧化剂,在十二烷基硫酸钠(SDS)的盐酸溶液中制得了珊瑚状聚苯胺( PANI)微纳米材料.对所制备的PANI分别采用傅里叶变换红外光谱(FT-IR)、场发射扫描电镜(FE-SEM)进行表征.实验结果表明加入SDS后,可以得到一种珊瑚状分级结构PANI微...     

Tuning peculiar antimony micro- and nano-morphology via a novel electrodeposition approach

Antimony (Sb) microspheres composed of antimony nanoplates or nanoparticles were synthesized via a novel electrodeposition technique onto the top surface of porous anodic alumina membrane (AAM) after the growth of antimony nanowires. The two kinds of morphologies could be controlled by altering the experimental parameters, and the size of the nanoplates could also be tuned by adjusting the deposition potential. Besides, the micro- and nano-structure had relative narrow size distribution. Based on the experimental results, the possible growth mechanism was also proposed briefly. The method demonstrated here extends the application of AAM and can be used to synthesize other micro- and nano-structured materials.     

Sheet Bulk Forming of Thin-Walled Components with External Gearing through Upsetting Using Controllable Deformation Zone Method

正Healthcare mechatronics is a typical multidisciplinary field involving machinery, medicine, computer, and automation, which has been widely applied in respiratory therapy, urology robot, rehabilitation exoskeleton, artificial heart, etc. Existing progresses has some defects in modeling, design and implementation of healthcare mechatronics. erefore, exploring new design theories, key technologies and typical applications is an e ective to promote the rapid development of this field.     

柴油机使用甲醇燃料M100的试验研究

非直喷柴油机采用火花塞或电热塞方法成功地用纯甲醇(M100)作燃料,为了获得可靠的着火及良好的发动机性能,研究了有关的影响因素及参数。对若干能改善甲醇发动机性能的技术措施,进行了试验研究。     

A Colorimetric Artificial Olfactory System for Airborne Improvised Explosive Identification

The detection of ultralow or nonvolatile target analytes remains a significant challenge for artificial olfactory systems even after decades of development, which severely limits their widespread application. To overcome this challenge, an artificial olfactory system based on a colorimetric hydrogel array is constructed for the first time as a universal representative. As an effective extension of conventional artificial olfactory systems that integrates the merits of its predecessors, the proposed system accurately mimics olfactory mucosa and specific odorant binding proteins using hydrogels endowed with specific colorimetric reagents for the detection of hypochlorite, chlorate, perchlorate, urea, and nitrate. Therefore, the proposed system is capable of detecting and discriminating between these five airborne improvised explosive microparticulates with a detection limit as low as 39.4 pg. Additionally, the system demonstrates good reusability over ten cycles, rapid response time of ≈0.2 s, and excellent discrimination properties, despite significant variation. This proof-of-concept study on colorimetric artificial olfactory systems yields a novel strategy for the direct and discriminative detection of nonvolatile airborne microparticulates.