液力忆惯容器装置建模与特性试验

针对液力忆惯容器装置已有数学模型忽略因素过多的问题,考虑油液的惯性、动力学黏度以及装置内部的干摩擦,建立符合工程实际的非线性数学模型. 试制液力忆惯容器装置样机,并进行台架试验. 结果表明,当位移激励的频率较低时,液力忆惯容器装置提供的惯性力、黏滞阻尼力较小,可以近似等效为干摩擦阻尼器;当激励的频率较高时,装置等效为理想忆惯容器、非线性黏滞阻尼器、干摩擦阻尼器三元件并联. 装置的输出合力、惯性力、阻尼力试验值与仿真值最大偏差分别为5.70%、9.15%、5.47%,惯质特性曲线和寄生阻尼特性曲线的试验值与仿真值最大偏差分别为4.23%和8.50%,表明数学模型准确可靠,能够满足工程需要,为液力忆惯容器装置在减振系统中的应用奠定了基础.     

PARAMAGNETIC MEISSNER EFFECTS IN MELT-TEXTURED Y_(0.99)Nd_(0.01)Ba_2Cu_3O_(7-y)SUPERCONDUCTOR

The paramagnetic Meissner effect (PME) was observed on the field-cooled M-T curvesof melt-textured Y0.99Nd0.01Ba2Cu3O7-y in applied magnetic fields from 1kOe toJ0kOe. In the magnetic field below 1kOe, the sample undergoes the typical transi-tion from the normal state to the superconducting state when it was cooled down. Theapplied magnetic fields in which the PME occurs, are very high compared with thefields reported in literatures. We propose that the occurrence of the PME may be dueto a phase transition of flux vortices in the superconductors.     

焊接热源有效利用率的测试计算法

给出实际热输入值是正确求解焊接热弹塑性问题和焊接残余应力与变形问题的前提;因而,准确地确定热源有效利用率η,在焊接力学的发展中是一个急待解决的命题。本文推荐采用的“测试计算法”提供了一个能够准确、简捷地求得η值的新途径。引入被焊材料的熔化潜热系数后,给出了线热源加热焊缝金属至熔化温度(处于液态)时的实际热有效利用率ηt 的表达式。在四种不同类型的薄板材料上进行了钨极氩弧焊试验,测试计算结果与理论值相符合。理论推导与试验结果均证明,形成焊缝所需要的线能量的无量纲数值等于焊缝金属熔化热有效利用率ηt 的倒数。文中给出的焊接规范参数选择原则也适用于符合线热源条件的其它熔焊热源。η值不但与焊接工艺方法、规范参数有关,而且也随被焊材料的热物理特性不同而异。     

The Role of Chronic Inflammation in Various Diseases and Anti-inflammatory Therapies Containing Natural Products

Chronic inflammation represents a long-term reaction of the body's immune system to noxious stimuli. Such a sustained inflammatory response sometimes results in lasting damage to healthy tissues and organs. In fact, chronic inflammation is implicated in the development and progression of various diseases, including cardiovascular diseases, respiratory diseases, metabolic diseases, neurodegenerative diseases, and even cancers. Targeting nonresolving inflammation thus provides new opportunities for treating relevant diseases. In this review, we will go over several chronic inflammation-associated diseases first with emphasis on the role of inflammation in their pathogenesis. Then, we will summarize a number of natural products that exhibit therapeutic effects against those diseases by acting on different markers in the inflammatory response. We envision that natural products will remain a rich resource for the discovery of new drugs treating diseases associated with chronic inflammation.     

基于分段式虚拟阻抗的改进下垂控制

当线路电阻在线路阻抗中的影响不能忽略时,系统的有功功率和无功功率会发生耦合,会降低下垂控制的性能和系统无功功率的分配精度,为此本文提出了基于分段虚拟阻抗的改进下垂控制策略.以无功功率比值为依据,分段设计自适应线路虚拟阻抗,减小线路阻抗差异,增大无功功率分配精度;在无功功率-电压下垂控制中加入自适应电压补偿环节以补偿电压跌落;最后,通过仿真和实验验证自适应分段虚拟阻抗和电压补偿环节的有效性.     

Boron Nitride Nanosheets Strengthened PVA/Borax Hydrogels with Highly Efficient Self-Healing and Rapid pH-Driven Shape Memory Effect

Self-healing hydrogels often possess poor mechanical properties which largely limits their applications in many fields. In this work, boron nitride nanosheets are introduced into a network of the poly(vinyl alcohol)/borax (PVA/borax) hydrogels to enhance the mechanical properties of the hydrogel without compromising the self-healing abilities. The obtained hydrogels exhibit excellent mechanical properties with a tensile strength of 0.410 ± 0.007 MPa, an elongation at break of 1712%, a Young's Modulus of 0.860 ± 0.023 MPa, and a toughness of 3.860 ± 0.075 MJ m⁻³. In addition, the self-healing efficiency of the hydrogels is higher than 90% within 10 min at room temperature. Benefiting from the excellent self-healing properties, the shapeability of the hydrogel fragments is observed using different molds. In addition, the hydrogels display rapid pH-driven shape memory effects and can recover to their original shape within 260 s. Overall, this work provides a new approach to hydrogels with integrated excellent mechanical properties, self-healing abilities, and rapid pH-driven shape memory effects.     

Effect of ammonia concentrations on SCC of α-brass under mode III loading

Stress corrosion cracking (SCC) of α-brass in ammonia solution was studied under mode III loading. The results showed that SCC occurred on the principal stress planes where shear stresses are zero. No SCC occurred on the maximum shear stress plane. Ammonia concentration affected fracture behaviour. When the concentration was low, many cracks with spacing of 10–150 μm were found on 45 ° planes, i.e., the principal stress planes. When the concentration was high, the cracks on 45 ° planes were not clearly visible because of serious general corrosion.     

中空螺旋状不锈钢冷却水喷头的熔模精密铸造

采用熔模精密铸造工艺，生产中空螺旋状不锈钢冷却水喷头，其工艺要点是，采用热型重力浇注，在高温下进行自由浇注。同时采用先慢后快，流量由小到大的浇注方法。结果表明：铸件表面光洁，无砂眼、气孔等缺陷，铸件合格率高于90％；在实际使用中，雾化区域直径大于1．5m，雾化率大于90％，喷雾效果稳定良好；盐雾试验2000h没有锈蚀，具有优良的耐磨性和耐腐蚀性。     

Effect of laser fluences on the structure of carbon nitride films deposited by direct current plasma assisted pulsed laser ablation

Carbon nitride films were deposited by direct current plasma assisted pulsed laser ablation of a graphite target under a nitrogen atmosphere at room temperature. The surface morphology, composition and bonding structure of the deposited films were characterized by atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, Raman, and X-ray photoelectron spectroscopy (XPS). The effect of laser fluences in the range 0.5–3 J/cm² on the surface morphology, composition and bonding structure of the carbon nitride films were systematically studied. As laser fluence is increased, AFM results show a great decrease in the surface roughness of carbon nitride films. FTIR and XPS results indicate an increase in the N/C ratio and the content of N atoms bonded to sp³ C, as well as a decrease in the content of H atoms and the content of N atoms boned to sp² C in the deposited films, and Raman spectra indicate an increase in the content of disordered sp² C atoms and the sp² cluster size. The increase in the film density and the decrease in the particle fraction contribute to the decrease of surface roughness with increasing laser fluence.     

非稳态轧制时轧机振动稳定性的数值分析

利用轧制理论方程和机械振动理论的能量判据 ,给出了一个较精确的分析轧机传动系统扭转振动稳定性的数值计算方法