Analytical Model Development for Stokes-Type Settling in a Solidifying Fluid

Analytical modeling was used to track the mudline displacement of a simulated fluid dispersion that underwent a simulated linear increase in the fluid viscosity as a function of time following an induction period. Modeling results indicate two regimes of settling behavior from the driving force of density differences between the particles and the fluid. A linear mudline movement was first determined in the regime of constant viscosity, and a logarithmic retarded mudline movement was numerically determined following a linear rise in fluid viscosity. The results show that the combination of settling and solidification leads to a transitional mudline movement similar to batch settling curves described by early settling theories.     

弹性体交联密度测定仪的改进及其应用

介绍了一种改进泊交联密度测定仪。该仪器可在小形变范围内通过测定溶胀平衡试样的载荷－形变曲线,进而求出弹性体交联密度,其测试灵敏度和精密度较原仪器有明显提高,可用于复合固体推进剂等各种热固性弹性体交联密度的测定。     

Systematic Review and Meta-Analysis of Mass Spectrometry Proteomics Applied to Human Peripheral Fluids to Assess Potential Biomarkers of Schizophrenia

Mass spectrometry (MS)-based techniques can be a powerful tool to identify neuropsychiatric disorder biomarkers, improving prediction and diagnosis ability. Here, we evaluate the efficacy of MS proteomics applied to human peripheral fluids of schizophrenia (SCZ) patients to identify disease biomarkers and relevant networks of biological pathways. Following PRISMA guidelines, a search was performed for studies that used MS proteomics approaches to identify proteomic differences between SCZ patients and healthy control groups (PROSPERO database: CRD42021274183). Nineteen articles fulfilled the inclusion criteria, allowing the identification of 217 differentially expressed proteins. Gene ontology analysis identified lipid metabolism, complement and coagulation cascades, and immune response as the main enriched biological pathways. Meta-analysis results suggest the upregulation of FCN3 and downregulation of APO1, APOA2, APOC1, and APOC3 in SCZ patients. Despite the proven ability of MS proteomics to characterize SCZ, several confounding factors contribute to the heterogeneity of the findings. In the future, we encourage the scientific community to perform studies with more extensive sampling and validation cohorts, integrating omics with bioinformatics tools to provide additional comprehension of differentially expressed proteins. The produced information could harbor potential proteomic biomarkers of SCZ, contributing to individualized prognosis and stratification strategies, besides aiding in the differential diagnosis.     

The influence of solid-phase concentration on the performance of electrorheological fluids in dynamic squeeze flow

The yield stress of electrorheological (ER) fluids increases by orders of magnitude when electric field is applied across them. In the absence of the field, ER fluids behave as Newtonian fluids. This paper is concerned with an experimental investigation to determine the rheological performance of ER fluids, consisting of a dielectric liquid carrier with a range of solid-phase concentration. The ER fluid was contained in a squeeze cell, which during motion subjects the fluid to both compressive and tensile loading. The results were analysed in terms of the capacity for the transmission of imposed forces across the fluid and showed a great dependence on the applied D.C voltage and the weight fraction of the dispersed solid-phase. In addition, the implications of the results to vibration control, where the ER fluid is employed in an engine mount, are discussed.     

Novel magnetic field sensor based on magnetic fluids infiltrated dual-core photonic crystal fibers

Novel magnetic field sensor based on magnetic fluids infiltrated dual-core Photonic Crystal Fibers (PCFs) is proposed in this paper. Inside the cross-section of the designed PCFs, the two fiber cores filled with magnetic fluids (Fe₃O₄) are separated by an air hole, and then form two independent waveguides with mode coupling. The mode coupling under different magnetic field strength is investigated theoretically. A novel and simple magnetic field sensing system is proposed and its sensing performances have been studied numerically. The results show that the magnetic field sensor with 15-cm PCFs has a large sensing range and high sensitivity of 4.80 pm/Oe. It provides a new feasible method to design PCF-based magnetic field sensor.     

滤波器湍流模型在低温流体空化流动数值计算中的应用

评价了滤波器湍流模型在低温流体空化流动计算中的应用。分别采用标准k－ε、修正RNG k－ε和FBM湍流模型对绕对称回转体在液氮中的空化流动进行模拟,并计算了进口湍流度对空化流动的影响。与实验结果对比表明：相对标准k－ε和修正RNG k－ε湍流模型的计算结果,FBM湍流模型可以更好地反映低温流体中汽液混合的空泡界面,更准确捕捉由于热力学效应影响而造成的压力和温度变化,计算得到的结果与实验数据更为接近。标准k－ε和修正RNG k－ε模型对计算工况的进口μ_T/μ_L|_inlet粘性比比较敏感。采用FBM湍流模型计算,可以明显减小进口μ_T/μ_L|_inlet粘性比对计算结果的影响。     

三层流体模型的非线性波演化方程

本文在浅水波假定下，采用垂直向平均方法导出了三层流体模型的推广的Ｂｏｕｓｓｉｎｅｓｑ方程；同时也给出了三层流体模型基于Ａｉｒｙ理论的很长的长波方程，线性化波动方程以及单向传播波的ＫｄＶ方程，这些方程在退化精形可化为二层，单层流体模型的相应方程。     

Viscous dissipation effect on entropy generation for non-Newtonian fluids in microchannels

An analytical study on the viscous dissipation effect on entropy generation in fully developed forced convection for single phase non-Newtonian fluid flow in circular microchannels is reported. In the first-law analysis, closed form solutions of the temperature distributions in the radial direction for the models with and without viscous dissipation term in the energy equation are obtained. In the second-law analysis, the two models are compared by analyzing their relative deviations in dimensionless entropy generation and Bejan number for different Brinkman number and power-law index. The findings show that under certain conditions the viscous dissipation effect on entropy generation in microchannels is significant and should not be neglected.     

双河油田注入水适应性及注水井酸化解堵研究

考察了双河油田双河联、江河联注入水堵塞地层的因素;膨胀性黏土，悬浮固体颗粒。细菌及悬浮污油。含膨胀性黏土的双河南、双河北及不含膨胀性黏土的双江岩心粉，在注入水中相对于地层水中的体积膨胀度分别为14．5％、11．1％及0．02％；注入100PV不含悬浮颗粒的等体积比地层水、注入水混合水使双河、双江岩心渗透率分别下降7％和4％、9％和7％。注入水中悬浮颗粒引起岩心渗透率下降，粒径越大、颗粒浓度越大、注入量越大，则渗透率越低。在粒径2．1μm或颗粒浓度3mg／L前后下降幅度变化较大。注入水中硫酸盐还原菌引起岩心渗透率下降，含菌量越大则渗透率开始下降时的注水量越小，注入含菌50个／L的水100PV使岩心渗透率下降7％。岩心对注水合油量敏感，注入含油量20mg／L的水50PV使岩心渗透率下降20％。在岩心注水实验中渗透率下降最严重的是双河南岩心，其次是双河北岩心．江河岩心较轻，注入精细过滤水的双河北岩心渗透率下降大大减少．说明悬浮固体是造成注水堵塞的主要因素。为了解除双河油田注水井的堵塞，研制了含黏土稳定剂、缓蚀剂、铁离子稳定剂、互溶剂的土酸液，与南阳油田使用的低伤害酸液一起，用于1口注水井的解堵，效果良好。图7表4参5。     

延迟破胶及强制裂缝闭合技术的研究及应用

采用延迟破胶技术,在压裂施工过程中加入不同浓度的胶囊破胶剂,利用它的延缓释放特性,使植物胶压裂液耐温、耐剪切稳定性增强,并且可以在不造成压裂液的流变性、滤失性和携砂性等过早丧失的前提下高浓度使用胶囊破胶剂。该技术与常规破胶技术相比,延缓释放率达50%,能更有效地清除液体残渣,减少压裂液对储层的伤害。同时由于有延缓破胶的特性,放喷采用相应的措施,可以降低支撑剂沉降速度,形成较好的沉砂剖面,提供高的裂缝导流能力,并且可以降低滤饼和压裂液残渣的伤害。