单相电源变为三相电源的裂相电路的研究

从Ｌ－Ｃ裂相电路出发,深入研究了三相对称负载性质、参数与裂相电路结构、参数之间的关系,裂相电路总电流与负载电流之间的关系,裂相电路总功率因数角与功功率因数角之间的关系。     

Three-Phase Effective Contact Angle in a Model Pore

We consider a model pore (2D) in which a sharp interface between two fluids contact a third fluid which wets the solid boundary. If the configuration is capillary dominated, the geometry can be determined analytically in terms of the effective contact angle. This angle depends not only on the interfacial tensions, but also on the capillary pressures. However, if the height of the cusp formed by the wetting fluid is much smaller than the pore width, the effective contact angle is a simple function of the interfacial tensions. It turns out to be the same function as in the case of an undeformed wetting layer of molecular thickness. The analytical expression for the effective contact angle has been confirmed by a numerical technique, known as the lattice-Boltzmann method. This method, in turn, has been validated with Neumann's law for the three-phase contact angles.     

分布式星载单基线SAR-ATI/DPCA技术性能分析与对比

SAR-ATI和SAR-DPCA技术是分布式星载单基线SAR-GMTI系统常用的杂波抑制和运动目标检测方法。本文从运动目标检测性能出发,以两种处理技术的杂波和动目标的信号模型和统计分布模型为基础,考虑杂波和加性噪声、通道幅度/相位不一致性误差、频率同步误差等影响因素,对ATI和DPCA技术的动目标检测性能进行分析和对比。仿真实验表明在地面场景均匀同质假设下,DPCA的检测性能优于ATI技术;通道相位误差对ATI和DPCA技术影响较大;在采取了一定的同步措施前提下,频率同步误差对两种技术的检测性能影响相对较小。      

基于智能换相策略的三相不平衡治理方法

配电网负荷复杂,特征多样,伴随而来的三相不平衡问题愈加突出,为电力系统的安全运行埋下了极大的隐患。为了更好的治理这一情况,本文首先分析了三相不平衡治理原理及换相开关设备的装置组成,选择了遗传算法与爬山算法局部搜索相结合的智能换相策略。此后在某台区实现了现场应用并通过三相负荷电流曲线图展示了治理效果,验证了智能换相装置实际应用的可行性。     

Gas holdup in a three-phase fluidized-bed bioreactor

The effects of system parameters on the gas holdup in a three-phase fluidized-bed bioreactor were examined. A valve technique was used to measure the average gas holdup in the reactor. Gas holdup was found to be strongly affected by fluid superficial velocities, bead size and density, electrolyte concentration, type of gas sparger, and temperature. Quantitative and qualitative observations were made regarding the differences between conventional glass-particle systems and low-density gel-particle systems. Most notably, the degree of bubble coalescence and mode of fluidization were highly dependent on each system.     

Mathematical Simulation and Design of Three-Phase Bubble Column Reactor for Direct Synthesis of Dimethyl Ether from Syngas

A three-phase reactor mathematical model was set up to simulate and design a three-phase bubble column reactor for direct synthesis of dimethyl ether (DME) from syngas, considering both the influence of part inert carrier backmixing on transfer and the influence of catalyst grain sedimentation on reaction. On the basis of this model, the influences of the size and reaction conditions of a 100000 t/a DME reactor on capacity were investigated. The optimized size of the 10000 t/a DME synthesis reactor was proposed as follows: diameter 3.2 m, height 20 m, built-in 400 tube heat exchanger (φ38×2 mm), and inert heat carrier paraffin oil 68 t and catalyst 34.46 t. Reaction temperature and pressure were important factors influencing the reaction conversion for different size reactors. Under the condition of uniform catalyst concentration distribution, higher pressure and temperature were proposed to achieve a higher production capacity of DME. The best ratio of fresh syngas for DME synthesis was 2.04.     

酰基二茂铁在液相中的电子传递性质

酰基二茂铁在液相中的电子传递性质蒋朝阳邰子厚＊季斌（南京大学配位化学国家重点实验室，南京２１００９３）关键词：酰基二茂铁三相氧化还原体系电子传递二茂铁及其衍生物在生物模拟和光电材料中有着极高的应用价值［１－４］。本文合成了一系列的酰基二茂铁ＦｃＸ（Ｘ...     

Study on the Extraction of L-Phenylalanine with Organo-phosphoric Acid in Two and Three-phase System

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｅｘｔｒａｃｔｉｏｎｏｆａｍｉｎｏａｃｉｄｓｈａｓｒｅｃｅｎｔｌｙａｔｔｒａｃｔｅｄａｇｒｅａｔｄｅａｌｏｆａｔｔｅｎｔｉｏｎ .Ｔｈｅｙｃｏｕｌｄｂｅｅｘｔｒａｃｔｅｄｉｎｔｏｒｅ ｖｅｒｓｅｍｉｃｅｌｌｅｓｏｒｍｉｃｒｏｅｍｕｌｓｉｏｎｓｗｉｔｈａｓｕｒｆａｃｔａｎｔｓｕｃｈａｓＡＯＴ [ｓｏｄｉｕｍｄｉ (2 ｅｔｈｙｌｈｅｘｙｌ)ｓｕｌｆｏｓｕｃｃｉｎａｔｅ].Ｌｅａ ｄｉｄｉｓｅｔａｌ.ｉｎｖｅｓｔｉｇａｔｅｄｔｈｅｐａｒｔｉｔｉｏｎｏｆａｍｉｎｏａｃｉｄｓｂｅ …     

Thermal stability of recombinant green fluorescent protein (GFPuv) at various pH values

The thermal stability of the recombinant green fluorescent protein (GFPuv) expressed by Escherichia coli cells and isolated by three-phase partitioning extraction with hydrophobic interaction chromatography was studied. The GFPuv (3.5–9.0 μg of GFPuv/mL) was exposed to various pH conditions (4.91–9.03) and temperatures (75–95°C) in the 10 mM buffers: acetate (pH 5.0–7.0), phosphate (pH 5.5–8.0), and Tris-HCl (pH 7.0–9.0). The extent of protein denaturation (loss of fluorescence intensity) was expressed in decimal reduction time (D-value), the time exposure required to reduce 90% of the initial fluorescence intensity of GFPuv. For pH 7.0 to 8.0, the thermostability of GFPuv was slightly greater in phosphate buffer than in Tris-HCl. At 85°C, the D-values (pH 7.1–7.5) ranged from 7.24 (Tris-HCl) to 13.88 min (phosphate) The stability of GFPuv in Tris-HCl (pH>8.0) was constant at 90 and 95°C, and the D-values were 7.93 (pH 8.38–8.92) and 6.0 min (pH 8.05–8.97), respectively. The thermostability of GFPuv provides the basis for its potential utility as a fluorescent biologic indicator to assay the efficacy of moist-heat treatments at temperatures lower than 100°C.     

用于油井相含率测量的光纤探针传感器研究

针对地面成熟三相流相含率测量传感器无法适应井下高温高压腐蚀的复杂环境,现有井下测量设备复杂,需要多种传感器和探头联合才能实现三相流相含率测量的问题,设计了一种光纤探针传感器。以蓝宝石作为光纤探针的前端敏感材料,利用气相和液相对光的折射率不同,通过检测探针反射光的光强来分辨光纤探针处于气相还是液相。通过检测经探针耦合进光纤的荧光光强分辨水相还是油相,从而实现单一探针传感器对油井内油相、水相、气相三相相含率的测量。