优化全钢胎面口型设计降低胎面气孔率

针对目前大规格胎面挤出存在质量、尺寸以及气孔较多问题进行分析,制定相应的改进方案(主要是优化胎面终口型设计)。通过对改进后实际使用效果进行跟踪对比,适当的改进可以解决现有问题、满足工艺要求、降低能耗、提高质量和效益等作用。     

催化剂配制罐搅拌系统技术改进及设计优化

针对大型分子筛生产线的扩建和技术改造．对生产线的配制罐中搅拌系统进行了合理的技术改进、设计优化和选型，保证了产品的质量，提高了产量，降低了生产成本，并经实际投入使用．效果良好，达到了设计者的目的。     

排料罐的失效分析及结构优化

分析了聚乙烯排料罐的失效原因,并采用ANSYS软件对可能的失效原因进行了验证。针对原设计中存在的问题,提出了两种改进措施:(1)对支座垫板设置圆角;(2)在对支座垫板设置圆角的同时增加支座数量。对改进后的设备进行了有限元模拟。改进后排料罐原失效部位的应力状况得到了很大改善,在实际应用中取得了很好的效果。     

12.00R20-20PR规格全钢载重子午线轮胎的优化

我国部分地区高载重、高速度、长距离、路况差,为满足地区需求,提升产品市场竞争力,根据公司12.00R20-20PR规格全钢载重子午线轮胎的产品特性,对12.00R20-20PR规格轮胎做了产品优化升级,包括花纹优化、施工优化、工艺优化;工艺优化又包括冠部优化、圈部优化、生产操作优化等;以进一步适应地区差异性和地区需求,增强12.00R20规格载重子午线轮胎的负荷能力、提升冠部抗冲击性能、提高胎圈耐久性能、加强产品的操纵稳定性,并降低轮胎的滚动阻力。经室内试验和路试表明,优化后的12.00R20规格全钢载重子午线轮胎在耐久和速度等方面都有大幅提升。     

BH型高效填料的研究及其在煤制烯烃预急冷塔中的应用

介绍了BH型高效波纹填料的设计原理、结构特点及其在煤制烯烃预急冷塔中的改造应用。改进后的复合填料塔达到了提高分离效果与产品纯度、扩大产品产量、提高产品质量、增加综合效益、缩短投资回报期以及降低能耗的目的。     

无微管缺陷六英寸SiC单晶的制备

SiC单晶衬底中的微管缺陷对SiC基器件是一种致命的缺陷,会严重影响SiC功率器件的成品率。基于物理气相传输(PVT)法,通过改进生长设计装配制备了绝对零微管缺陷6in的n型4H-SiC单晶。从结晶学和动力学原理对改进生长设计装配消除微管的机理进行分析,阐明了单晶生长过程中微管分解和闭合的机制。采用的优化生长设计方案不仅有利于提高SiC单晶生长的稳定性,更可以提高SiC单晶的结晶质量,达到快速降低微管缺陷目的。所制备的无微管缺陷、大尺寸6inn型4H-SiC单晶更加适合制作高压以及特高压功率器件。     

过热水硫化工艺改进应用研究

通过对11.00R20规格轮胎发泡找到合适硫化时间,并由埋线测温所得各部件温度-时间曲线对轮胎各部件进行等效硫化时间计算,测温结果表明该规格轮胎新工艺条件下各部件硫化程度较理想。通过增加过热水止循环步序时间和降低内外温温度,提高轮胎产品质量的同时降低了能源消耗。     

无微管缺陷六英寸SiC单晶的制备EI北大核心CSCD

SiC单晶衬底中的微管缺陷对SiC基器件是一种致命的缺陷,会严重影响SiC功率器件的成品率.基于物理气相传输(PVT)法,通过改进生长设计装配制备了绝对零微管缺陷6 in的n型4H-SiC单晶.从结晶学和动力学原理对改进生长设计装配消除微管的机理进行分析,阐明了单晶生长过程中微管分解和闭合的机制.采用的优化生长设计方案不仅有利于提高SiC单晶生长的稳定性,更可以提高SiC单晶的结晶质量,达到快速降低微管缺陷目的.所制备的无微管缺陷、大尺寸6 in n型4H-SiC单晶更加适合制作高压以及特高压功率器件.     

煤基乙二醇装置工艺改进与优化

介绍了煤基乙二醇装置草酸酯加氢工艺改进流程,克服工艺设计缺陷,避免催化剂结焦,提高了乙二醇产物的生产效率;同时对精制单元进行改造,串联树脂床装置,对提高乙二醇产品紫外透过率,降低醛含量具有显著效果。     

一次管柱高压砾石充填防砂技术研究

针对目前机械防砂工艺存在的作业周期长、油层处理半径小等缺陷,为了达到减少作业周期、降低油层伤害、提高近井地带渗透率等目的,通过将压裂技术原理与机械防砂技术相结合,设计和开发了一次管柱高压砾石充填防砂技术.该技术对充填砾石的选择、防砂筛管,携砂液的参数指标进行了改进和完善,大大改善了油井的渗流能力,提高了油井的防砂效果.     

国外轮胎钢丝圈和胎圈钢丝的发展变化

通过对国(境)外轮胎剖析分析其轮胎钢丝圈和胎圈钢丝的发展变化.分析表明,国外载重子午线轮胎钢丝圈形状主要为六角形(轻载多为矩形或圆形),钢丝直径在1.2～1.6 mm之间,抗拉强度逐渐增大,多达到2 000 MPa以上,断裂伸长率大于5%;轿车子午线轮胎钢丝圈多为矩形,钢丝直径为0.90～1.00 mm,抗拉强度也可达到2 000 MPa以上;国外斜交轮胎胎圈钢丝性能已与子午线轮胎没有很大差别.     

Magnetic bead cellulose

Mangetic bead cellulose was prepared from viscose and ferrite powder by employing the suspension procedure using the thermal sol-gel transition. The particles thus obtained can be stirred if acted upon by an external rotary magnetic field of a common permanent magnet. Isolation of the particles from reaction suspensions should proceed in a thin layer using a strong magnetic field. Magnetic bead cellulose prepared from supermagnetic powder of the SmCoFe alloy shows a better behaviour in the magnetic field than ferrite materials.     

胎圈结构对钢丝圈应力分布的影响

从理论上分析三角形径向扩张模式和L形扭转扩张模式胎圈结构对钢丝圈应力的影响,并用有限元方法进行计算验证.结果表明,与L形胎圈结构相比,三角形胎圈结构钢丝圈应力分布较均匀,有利于提高钢丝圈强力和轮胎的安全性能,延长轮胎使用寿命.     

六角型六工位钢丝圈生产线

对新研发的六角型六工位钢丝圈生产线作了简介,对生产线的多部件分别作了工作原理和工作步骤的分析和介绍,包括导开机、挤出机、钢丝牵引储存装置、缠绕机等共10个部件。     

钢丝圈生产线的改造

介绍钢丝圈生产线的改造情况：取消立式导开架，改装卧式导开架；取消浸酸槽、洗酸加温槽及擦干装置，改装电热除锈机；改进挂胶挤出机机头和卷成机机头结构；冷却槽、牵引机合并，改成牵引冷却机，取消吹干装置。生产线改造后，钢丝圈质量大大提高，钢丝浪费减少。     

Polymer bead preparation from bulk polymers

A method of preparing polymer beads from chloroform solutions of bulk polymer was developed. The technique involved solvent removal while the polymer solution was stirred in an aqueous dispersing medium. Bead size could be varied by adjusting the concentration of the suspending medium and the method was found to be applicable to chloroformsoluble, water-insoluble polymers. Copolymers, low-tack rubbers, and polyblends were also converted to bead form and, in the latter case, phase separation occurred. Furthermore, it was possible to encapsulate finely divided inorganic fillers within the polymer beads. © 1992 John Wiley & Sons, Inc.     

Viscosity of bead suspensions in polymeric solutions

Viscosity measurements made by a cone-plate viscometer on polyisobutylene in decalin solutions at different concentrations and their corresponding glass bead suspensions with filler loadings up to 40% by volume are reported. The range of shear rate $ \dot \gamma $ investigated is between 0.1 and 1000 sec^?1. The solutions show shear-thinning behavior, and the relative viscosity η_r of the slurries generally decreases with increasing shear rate. The results indicate two different types of mechanism, respectively at high and low shear rates. At low $ \dot \gamma $, the relative viscosity can be correlated extending relations already well known for suspensions in Newtonian liquids which are based on the mechanism of aggregate disruption. The behavior at high $ \dot \gamma $ values is believed to be due to the influence of the filler on the flow properties of macromolecules, in particular on relaxation time. Through a shifting procedure, an increase in relaxation time which depends on filler content and not on polymer concentration is shown.     

Enhancing pseudoislet biofunctionality using gelatin bead technology

Abstract

Central necrosis hampers the formation of highly biofunctional Pseudoislets (PIs), which consist of aggregates of insulin-secreting pancreatic β-cells. Necrosis arises because of a shortage of nutrient and oxygen diffusion to the core of the PIs during culture, especially when PIs exceed >200?µm. This study aimed to generate ‘vents’ by incorporating gelatin beads (GBs) into the center of PIs and to examine if this promotes nutrient and oxygen diffusion by blocking the center for cell residence. In addition, we examined the impact of delivering GBs loaded with anti-necrosis or anti-apoptosis drugs to the center of PIs. The BRIN-BD11 rat pancreatic β-cell line was used to generate PIs by suspension culture. PIs were generated at a seeding density of 32,000 cells/PI and cultured for up to 7?days. GBs of 40?µm diameter were produced from Gelatin A and crosslinked with 5% glutaraldehyde for 6?h. The neat GBs or GBs loaded with 100?ng/mL IL-10, or 5?µg/mL anti-IL-1β were incorporated into PIs. The cell viability of the PIs was assessed using cell counting kit-8 (CCK8) and lactate dehydrogenase (LDH) assays. Glucose-stimulated insulin release (GSIS) from PIs was evaluated after stimulation with 16.7?mM glucose for 20?min. Incorporating IL-10, or anti-IL-1β -loaded GBs to PIs synergistically enhanced cell proliferation and reduced cell death. Importantly, PIs cultured for 1 week following incorporation of cytokine-loaded GBs displayed enhanced biofunctionality in terms of higher GSIS.     

一种新型电镀串珠制造工艺

提出了一种采用新型电镀方法制造各类型电镀串珠的全新工艺,着重介绍了串珠试制过程中的脉冲电镀工艺、磨具设计,实验结果表明,电镀串珠镀层质量提高,生产时间缩短,胎体高度的偏差也有较大提高.     

Adsorption equilibrium of copper ion and phenol by powdered activated carbon, alginate bead and alginate-activated carbon bead

The adsorption equilibrium characteristics for single and binary components of copper ion and phenol onto powdered activated carbon, alginate bead and alginate-activated carbon (AAC) bead were studied. Adsorption equilibrium data of phenol and copper ion onto the adsorbents could be represented by Langmuir equation. The adsorption capacity of Cu²⁺ onto different adsorbents was in the following order: alginate bead > AAC bead > powdered activated carbon (PAC). On the other hand, that of phenol was: PAC > AAC bead > alginate bead. Multi-component equilibrium data were correlated by three different models. Among them the ideal adsorbed solution theory (IAST) gave the best fit to our data. And the adsorption amount of Cu²⁺ onto AAC bead was greater than that of phenol in the binary components.