斜盘支承反力对轴向柱塞泵结构及参数的影响

本文通过对轴向柱塞泵的斜盘支承反力的分析计算,阐述了影响斜盘支承反力的因素。从而为轴向柱塞泵部分结构及参数的设计提供了一定的理论依据。     

提高空气源热泵热水器性能的途径

针对家用空气源热泵热水器存在的问题,通过分析空气源热泵热水器的工作原理及性能影响因素,提出了提高空气源热泵热水器性能的有效途径。     

热泵干燥机与燃油干燥机的性能对比研究

本文从空气处理技术、干燥速率、干燥成本及能耗四个方面对燃油干燥机和热泵干燥机的性能进行对比分析,研究结果表明热泵干燥机的干燥速率较慢,但干燥的成本和能耗较低。因此完善热泵干燥技术具有广泛的发展前景。     

大型核电机组给水管道振动初探

以某1000MW大型核电机组在调试试运期间给水管道振动为例,分析讨论了影响给水管道系统振动的主要因素,提出了应对措施。     

大蹼铃蟾皮肤白蛋白的胰蛋白酶抑制活性研究

通过离子交换层析和凝胶过滤层析,在大蹼铃蟾(Bombina maxima)皮肤中得到其白蛋白。该蛋白有强烈抑制胰蛋白酶水解小肽底物的活性,但对其它丝氨酸蛋白酶如凝血酶、糜蛋白酶、弹性蛋白酶及枯草杆菌蛋白酶无抑制。它以1∶1摩尔比同胰蛋白酶形成稳定结合的复合物。经测定发现,该蛋白对温度、pH值及还原剂二硫苏糖醇的耐受性较强,三种因素对其胰蛋白酶抑制活性影响不大。说明大蹼铃蟾皮肤白蛋白具有稳定的胰蛋白酶抑制活性,可能在大蹼铃蟾防御天敌捕食的过程中发挥重要作用。     

Light-driven directional ion transport for enhanced osmotic energy harvesting

Light-driven ion (proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO₂/C₃N₄ semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO₂/C₃N₄ heterojunction nanotube membrane can generate a photocurrent of about 9 μA/cm², corresponding to a pumping stream of ∼5500 ions per second per nanotube. By changing the position of TiO₂ and C₃N₄, a reverse equivalent ionic current can also be realized. Directional transport of photogenerated electrons and holes results in a transmembrane potential, which is the basis of the light-driven ion transport phenomenon. As a proof of concept, we also show that this system can be used for enhanced osmotic energy generation. The artificial light-driven ion transport system proposed here offers a further step forward on the roadmap for development of ionic photoelectric conversion and integration into other applications, for example water desalination.     

钼系多金属氧酸盐缓蚀性能的研究

采用静态失重法研究了钼系多金属氧酸盐在水介质中对20#钢的缓蚀作用,研究了pH值对缓蚀性能的影响,结果显示,6种钼系多金属氧酸盐均表现出良好的缓蚀性。     

一类不可逆半导体热泵热力学分析

应用热力学理论,研究了线性唯象传热律下半导体热泵的性能特性,分析了电流、面积分配及传热率等参数对最优性能的影响,得到一般半导体热泵的优化参数.     

Optimization of cross angle based on the pumping dynamics model

The single cylinder and multi-cylinder pumping dynamics model of a swash plate piston pump were improved.Particular attention has been paid to the design influences of key parts of the valve plate such as relief groove,pre-compression/ expansion and fluid inertia effect of the unsteady flow.Some important parameters,such as the discharge area,discharge coefficient,fluid bulk modulus,were especially analyzed using numerical methods or by experiment-based estimation.Consequently,the mathematical results of pressure pulsation and flow ripple agree well with experimental results from the test-rig of the flow ripple.Therefore,the cross angle and the pre-compression angle of the valve plate was optimized,based on the pumping dynamics model.Considering both the flow ripple and the cylinder pressure of the pump,the cross angle is set to be 2.2° to 2.7° with a pre-compression angle of 1.7° to 2.2°,so the pumping dynamics character can obtain the best result.