Efficiency,mechanism and microbial community of Cd(II) removal by mixed bacteria enriched from heavy metals mine soil

Mixed bacteria were enriched from heavy metals mine soil for cadmium (Cd(II))-containing wastewater treatment. Batch adsorption experiment results showed that the optimal pH, temperature, initial Cd(II) concentration, and biomass dosage were 6.0, 30 °C, 20 mg/L, and 1 g/L, respectively. Living biomass exhibited better Cd(II) removal efficiency (91.97%) than autoclaved biomass (79.54%) under optimal conditions. The isotherms and kinetics of living biomass conformed to the Langmuir isotherm model and pseudo-first-order kinetic model, respectively. FTIR results implied that amine groups, hydroxyl groups and phosphoric acid play an important role in the Cd(II) adsorption process, while XRD results showed that crystalline Cd(OH)₂ and CdO were obtained. After Cd(II)-containing wastewater treatment exposure, the dominant bacteria genera included Comamonas (39.94%), unclassified_f__Enterobacteriaceae (34.96%), Ochrobactrum (14.07%), Alcaligenes (4.84%), Bordetella (2.07%), Serratia (1.04%), and Bacillus (1.01%). Function prediction showed that the abundance of metabolic genes changed significantly. This study proposes the potential application of mixed bacteria for Cd(II)-containing wastewater treatment.     

Correlation between motion of source bender element and feedback signal induced by self-monitoring

Since the introduction of bender element tests to soil testing, the reliability of the estimated travel time has been the most serious problem. The author has previously shown a potential solution whereby removing the response of the bender element subsystem from the whole response could dramatically improve the accuracy of the travel time estimation. In order to lay the foundation for estimating the response of the bender element subsystem, this paper examines the correlation between the displacements of the element and the induced feedback signals by employing a self-monitoring element. The response of the self-monitoring element is modeled as a transfer function involving two internal transfer functions that relate the input signals to the displacements and the displacements to the feedback signals, respectively. Using a laser displacement sensor, the displacements are directly measured through the entire surface and reveal the three-dimensional bending motion of the element oscillating in both longitudinal and width directions. The feedback signals are similar to, but inconsistent with, the tip displacements, and an attempt is made to correct the feedback signals. Finally, a conclusion is given on the potential for estimating the response of the bender element subsystem using the self-monitoring element.     

基于QFD的社区老年人慢性病管理产品服务系统设计研究

以老年慢性病患者为研究对象,以提高社区居家养老模式下的老年慢性病管理水平为研究目标,以提供社区卫生机构慢性病管理产品服务方案为实践目标。在数据收集和分析阶段,采用定性研究的方法收集用户数据,通过构建典型人物模型总结现有问题;通过分解典型场景中的用户需求,得出对应的具体服务需求和服务内容;并以KANO模型的结果为依据,划分服务需求的类型。在服务模型构建阶段,以QFD方法及相关理论为指导,构建质量屋,输出用户需求对应的服务特性重要度排序,并依照设计原则评估。构建基于不同类型用户需求的质量屋,得出慢性病管理有关的服务特性在社区场景下的重要度排序,并提出面向社区老年人的慢性病管理产品服务系统设计策略。     

无极绳绞车运输系统及其综合保护装置研究

为了确保煤矿安全运输，研究了无极绳绞车运输系统及其综合保护装置，根据工作面通风系统及巷道布置情况，对无极绳绞车进行了选型，研究了无极绳绞车运输系统的组成和主要功能，主要具有控制功能、保护功能、显示功能、语音提示功能、应急运行功能、存储记忆功能、图形编辑功能、通信及急停功能，然后分析了无极绳绞车运输的综合保护装置。研究为类似工程条件下无极绳绞车运输系统设计提供了技术支持。     

Stress distribution in thick-walled cylinder due to non-uniform radial pressure on the example of reinforcement corrosion in concrete

This paper presents an analytical solution to the non-uniform pressure on thick-walled cylinder. The formulation is based on the linear elasticity theory (plain strain) and stress function method. As an example, the proposed solution is used to model the stress distribution due to non-uniform steel reinforcement corrosion in concrete. The model is formulated considering different scenarios of corrosion pressure distribution. It is validated against the finite element model for different cases of non-uniform pressure distributions. The results show that the corrosion-induced cracks are likely to start just beyond the anodic zone. This is confirmed by the experimental tests on concrete cylinder exposed to non-uniform accelerated corrosion of steel reinforcement. The model can be effectively used to calculate the distribution of corrosion-induced stresses in concrete.     

左西孟旦在心脏外科术后重症患者的应用研究

目的：研究左西孟旦对重症心脏外科术后患者心功能、肺高压、肾功能等方面的影响。方法：选取2014年1月－2019年6月在宁波市医疗中心李惠利医院胸外科接受心脏手术治疗的重症患者320例，采用随机数字表法将患者分为实验组和对照组，各160例。根据患者具体病情选择心脏换瓣手术或非体外循环搭桥手术，实验组围术期同时给予左西孟旦治疗。比较2组患者手术前后不同时间心、肾功能指标水平及肺动脉收缩压（PASP）变化。结果：术后24 h 2组患者心率（HR）、平均动脉压（MAP）、中心静脉压（CVP）比较无明显差异，实验组血乳酸（LAC）在术后12 h及术后24 h明显低于对照组（P<0.05或P<0.01）；术后1～14 d 2组左室舒张末期容积（LVEDV）、收缩末期容积（LVESV）均呈减小趋势，且同一时间点实验组明显小于对照组（P<0.05或P<0.01）；2组心脏指数（CI）及左室射血指数（LVEF）均呈升高趋势，且同一时间点实验组明显高于对照组（P<0.01）。术后3～14 d 2组血浆N末端前脑利钠肽（NT-proBNP）水平及PASP均呈降低趋势，且同一时间点实验组明显低于对照组（P<0.05或P<0.01）；实验组血清尿素氮（BUN）、24 h尿蛋白定量（24Upro）及血肌酐（Scr）水平均无明显变化（P>0.05），对照组血清BUN、24Upro及Scr水平先升高后降低，且同一时间点实验组明显低于对照组（P<0.05或P<0.01）。与对照组比较，实验组术后死亡率、ICU住院时间、呼吸机及主动脉球囊反搏（IABP）支持时间均明显低于对照组（P<0.05）。结论：心脏手术后给予左西孟旦可有效改善重症患者术后心功能，保护由于低灌注引起的肾损伤，且可降低术后早期肺动脉高压的发生，值得临床借鉴。     

[学科发展]5D打印——生物功能组织的制造

生物制造是制造技术与生命科学技术交叉融合产生的新兴学科方向，这一学科方向的发展将为巨大的人体组织与器官市场提供新技术，同时也给制造技术变革带来新机遇。面向生物制造未来发展，提出5D打印制造概念，论述了5D打印的内涵，分析了其关键技术。结合生物制造技术的现有进展，介绍了研究团队在心肌组织支架的制造、类脑神经组织制造、爬行生命机械混合机器人方面取得的初步研究进展，为生物制造技术拓展新方向提供新思路。     

Three-phase four-wire shunt active power filter based on the SOGI filter and Lyapunov function for DC bus control

The three-phase four-wire shunt active power filter (SAPF) was developed to suppress the harmonic currents generated by nonlinear loads, and for the compensation of unbalanced nonlinear load currents, reactive power, and the harmonic neutral current. In this work, we consider instantaneous reactive power theory (PQ theory) for reference current identification based on the following two algorithms: the classic low-pass filter (LPF) and the second-order generalized integrator (SOGI) filter. Furthermore, since an important process in SAPF control is the regulation of the DC bus voltage at the capacitor, a new controller based on the Lyapunov function is also proposed. A complete simulation of the resultant active filtering system confirms its validity, which uses the SOGI filter to extract the reference currents from the distorted line currents, compared with the traditional PQ theory based on LPF. In addition, the simulation performed also demonstrates the superiority of the proposed approach, for DC bus voltage control based on the Lyapunov function, compared with the traditional proportional-integral (PI) controller. Both novel approaches contribute towards an improvement in the overall performance of the system, which consists of a small rise and settling time, a very low or nonexistent overshoot, and the minimization of the total harmonic distortion (THD).     

非对称因素对热轧纯钛中厚板出口楔形的影响

针对纯钛中厚板热轧过程中可能出现的轧件断面楔形问题,结合四辊轧机设备和工艺的非对称特点,基于影响函数法建立双悬臂梁辊系弹性变形模型,研究对中误差、机架刚度差、坯料楔形、横向温差等非对称因素对轧件断面楔形的影响。结果表明对中误差、机架刚度差、横向温差对出口楔形的影响随着板宽和压下量的增大而增大,入口楔形对出口楔形的影响随着板宽增大和压下量的减小而增大。