Influence of technological parameters on coating speed of Pb-GF composite wire

The technological parameters have important effects on molding process of lead-clad glass fiber composite wire. If the extrusion force, temperature and gap size are too large or small, a dead zone will form in the front of the inlet mold orifice, and the continuous clad extrusion and coating speed will be influenced. Under the condition of equal flow, the maximum and minimum theoretical values of the extrusion force, temperature and gap size are studied. The results show that the gap size is a key parameter that affects the continuous clad extrusion and coating speed when the extrusion force and temperature are kept constant. The maximum value (H_ max) of gap size is 0.50mm and the minimum one (H_ min) is 0.12mm. At a gap size of 0.17mm or 0.29mm, the maximum of metal extrusion per unit time and optimal coating speed can be obtained when the extrusion temperature is 300℃ and the extrusion force is 450kN.

Physical and Technological Parameters of Maize Varieties (Zea mays L.) Grown in the Southern Parts of Benin and the Influence of Chemical Composition

Objective: The study aims to investigate some physical and technological parameters of varieties of maize collected from the most representative areas of maize production in the southern part of Benin, and mainly used by the populations of those areas. Method: The chemical composition, physical and technological characteristics of the grains were determined using standard methods. Results: The results showed that the weight of 1000 grains ranges from 158.01 to 305.12 g, the length from 0.79 to 1.81 cm, the average width from 0.74 to 1.51 cm, thickness from 0.36 to 0.85 cm and density from 1.07 to 1.25. Regarding the technological parameters, the hardness of the grains before and after cooking was between 16.78 and 47.20 kgf, and 0.23 and 0.71 kgf respectively, while the cooking time varies from 71.00 and 158.33 mn. There was a positive and significant correlation (r = 0.405;p < 0.026) between the hardness after cooking and the weight of 1000 grains, between the hardness after cooking and grain width (r = 0.460;p < 0.011). A positive and highly significant correlation (r = 0.527, p < 0.003) was also observed between the hardness after cooking and the grain length, between the hardness after cooking and the thickness of grain (r = 0.476, p < 0.008), and between the grain density and the weight of 1000 grains (r = 0.481, p < 0.007). A positive and highly significant correlation (r = 0.923, p < 0.000) was also observed between maize grain length and width, and between grain length and grain thickness (r = 0.764, p < 0.000) and between the width and thickness (r = 0.764, p < 0.000). On the other hand, a significant negative correlation (r = -0.394, p < 0.031) was found between the hardness before cooking and the thickness and between the hardness before cooking and sphericity index (r = -0465*, p Conclusion: Through its chemical and technological characteristics the maize constitutes an important raw material for many culinary recipes in West African region.

Influences of Technological Parameters on Carbothermal Reduction and Nitridation of Titanium Dioxide

The particle size of starting materials, the homogeneity of the carbon/oxide mixtures, and the carbon content are important parameters for a rapid reaction. The influences of technological parameters（carbon particle size, oxide particle size, mixing method, carbon content） on the reaction rate of carbothermal reduction and nitridation of titanium dioxide （TiO2 ） were investigated by a continuous thermo-gravimetric analyzer for large size specimen. The carbon particle size is the most impor tant parameter for a rapid reaction, but carbon particle may have no influence on the morphology of titanium nitride （TiN） powder. Oxide particles are the precursors of TiN powder, but the TiO2 particles size has very little influence on the reaction rate. The carbon content not only influences the reaction rate to some degree, but also influences the purity of TiN powder. The mixing method of the specimen has very little influence on the reaction rate. These results are suitable for other nitrides and carbides prepared by carbothermal reduction method.

Effect of technological parameters on optical performance of fiber coupler

To find out the influence of technological parameters on optical performance of fused optical fiber device, the fiber coupler was served as subject investigated by using the fused biconical taper machining as experimental setup. Fused fiber coupler's optical performances such as insertion loss, excess loss, directivity and uniformity were tested with the optical test system that was constituted of tunable laser and optical spectrum analyzer. Especially the relationship between optical performance and drawing speed was investigated. The experimental results show that the optical performance is closely related to process conditions. At fused temperature of 1 200 ℃, there exists a drawing speed of 150 μms, which makes the device's performance optimum. Out of this speed region, the optical performance drops quickly. At drawing speed of 200 μms, the excess loss is relatively small when the fused temperature is above 1 200 ℃. So the technological parameters have close relationship with optical performance of the coupler, and the good performance coupler can't get until the drawing speed and fused temperature match accurately.

Correlation Analysis of Processing Technology,Physical Parameters and Chemical Components during Plain Stir-baking of Trichosanthis Radix

[Objectives]To explore the correlation of processing technology,physical parameters and chemical components during plain stir-baking of Trichosanthis Radix.[Methods]Based on mixture uniform experiment design,the Trichosanthis Radix was prepared by plain stir-bake method.Delphi method was used to evaluate and select the highest-scoring processed product for measuring physical parameters.UV spectrophotometry was used to determine the contents of starch and polysaccharide.The correlation and linear regression model of processing technology,physical parameters and chemical components were established with the aid of SPSS 26.0[Results]After processing by plain stir-bake method,the relative density and chromaticity showed a decreasing trend in the processed products of Trichosanthis Radix,the oxidation value,hydroscopic rate and swelling decreased firstly and then increased,and pH increased firstly and then decreased.The content of total starch decreased,the content of polysaccharide increased,and there was a negative correlation between them.There was a significant positive correlation between temperature and oxidation value,swelling and hydroscopic rate,hydroscopic rate and polysaccharide,and there was a significant negative correlation between relative density and hydroscopic rate or polysaccharide,total starch and hydroscopic rate or swelling.The linear relation model between processing technology and physical parameters and chemical components was r2>0.9.[Conclusions]After processing by plain stir-bake method,the physical parameters of Trichosanthis Radix changed,and there may be mutual conversion between total starch and polysaccharides.To a certain extent,physical parameters can be used to evaluate the quality of processed products of Trichosanthis Radix.This study is expected to provide a reference for research on quality evaluation of processed products of traditional Chinese medicine.

Corneal biomechanical data and biometric parameters measured with Scheimpflug-based devices on normal corneas

AIM： To analyze the correlations between ocular biomechanical and biometric data of the eye,measured by Scheimpflug-based devices on healthy subjects.METHODS： Three consecutive measurements were carried out using the corneal visualization Scheimpflug technology（Cor Vis ST） device on healthy eyes and the 10 device-specific parameters were recorded.Pentacam HR-derived parameters（corneal curvature radii on the anterior and posterior surfaces;apical pachymetry;corneal volume;corneal aberration data;depth,volume and angle of the anterior chamber） and axial length（AL） from IOLMaster were correlated with the 10 specific CorV is ST parameters.RESULTS： Measurements were conducted in 43 eyes of 43 volunteers（age 61.24±15.72y）.The 10 specific Cor Vis ST data showed significant relationships with corneal curvature radii both on the anterior and posterior surface,pachymetric data,root mean square（RMS） data of lower-order aberrations,and posterior RMS of higher-order aberrations and spherical aberration of the posterior cornea.Anterior chamber depth showed a significant relationship,but there were no significant correlations between corneal volume,anterior chamber volume,mean chamber angle or AL and the 10 specific CorV is ST parameters.CONCLUSION： Cor Vis ST-generated parameters are influenced by corneal curvature radii,some corneal RMS data,but corneal volume,anterior chamber volume,chamber angle and AL have no correlation with the biomechan-ical parameters.The parameters measured by CorV is ST seem to refer mostly to corneal properties of the eye.

Application of Uniform Experimental Design in Optimizing Excitation Parameters for Magnetic Frequency Mixing Measurements

Excitation parameter preferences are key factors a ecting the performance of magnetic frequency mixing detection.A uniform experimental design method was used to analyze this influence.Using fuzzy theory,a comprehensive model is established for evaluating the e ect of magnetic frequency mixing.A polynomial is selected as the regression function to express explicitly the correlation between the excitation parameters and the frequency-mixing e ect.The excitation parameters were then optimized using genetic algorithm.Magnetic frequency mixing experiments were conducted to measure the surface hardness of some ferromagnetic materials.Frequency mixing is further enhanced under the optimal settings,resulting in an improvement in the measurement sensitivity.The results of this study support the application of the magnetic frequency mixing technique in non-destructive testing.

Earthquake Response and Isolation Layer Parameter Effect of Seismic Isolation Systems of Transformers With Bushings

国内外震害表明，变压器在地震中的破坏型式多样，易损性极高。隔震技术是一项能够有效降低地震反应的新型抗震技术，而变压器及套管隔震层的设计和参数选择与普通结构有较大的差异。首先，建立了大型电力变压器及套管隔震体系的多质点分析模型，采用Matlab软件编写计算程序，分别输入人工地震波和Taft地震波，对变压器及套管隔震体系的地震响应进行分析；最后，开展了隔震层等效水平网0度、等效阻尼比、双线性恢复力模型的屈服剪力系数及屈服后刚度等参数的地震响应影响分析。分析结果表明：合理设计变压器及套管隔震体系的隔震层参数，可有效降低变压器及套管的地震响应；另外，通过隔震层的参数分析，得到了相关参数的合理取值范围。该研究对今后变压器及套管隔震体系的设计具有参考与指导作用。

Body Structure Design, Simulation and Parameter Optimization of a Crawler Type Mobile Flat Bedplate Frame Composite Car

The report mainly studied the crawler frame motion platform to reduce weight and increase the intensity. Report described the structural design process which using CAD/CAE technology for solid modeling, simulation analysis, parameter optimization. And it also explained the outstanding advantages of CAD/CAE technology in mechanical design as well as simulation analysis.

EFFECT OF OPENING OPERATING PARAMETERS ON YARN QUALITY IN FINE AND MEDIUM COUNT FRICTION SPINNING

In this paper, a quantitative analysis of the opening quality in friction spinning and its main ef-fecting factors is first made. Upon this basis the Box-Hunter’s experimental design method is usedto establish the quadratic regressional equations in terms of primary opening technologicalparameters and yarn quality for medium and fine count friction spinning. The results of analysisand discussion show that the proper choice of opening roller speed and its reasonable match withthe yarn count is singificant for ensuring the spinning quality index as well as reducing unevenness,thin and thick places of the yarn.

Warehouse Environment Parameter Monitoring System and Sensor Error Correction Model Based on PSO-BP

The warehouse environment parameter monitoring system is designed to avoid the networking and high cost of traditional monitoring system.A sensor error correction model which combines particle swarm optimization(PSO)with back propagation(BP)neural network algorithm is established to reduce nonlinear characteristics and improve test accuracy of the system.Simulation and experiments indicate that the PSO-BP neural network algorithm has advantages of fast convergence rate and high diagnostic accuracy.The monitoring system can provide higher measurement precision,lower power consume,stable network data communication and fault diagnoses function.The system has been applied to monitoring environment parameter of warehouse,special vehicles and ships,etc.

Development and application of spectacles frame parameter measurement apparatus

The measurement of the spectacles frame parameters has substantial effects on both the production and ex- port of spectacles products.In fact,this measurement is the measurement of related three-dimensional trajectory. The working principles of the measurement apparatus developed based on capacitive grating technology are introduced in this paper.Capacitive grating technology is a precision length measurement method.Its advantages are small vol- ume,low price,low production cost,and easy to obtain precise readings of the measured data.The measurement apparatus is composed of one industrial control computer,two microcontrollers and corresponding circuits.The sys- tem stability is guaranteed during the design of the circuit with the practical situation of its industry application taken into account.The software is divided into lower layer and upper layer.Each layer has different emphasis.The cau- ses of system errors and the method of error elimination are also analyzed.The analysis of the data obtained from ex- periments and the operating results of prototype apparatus both indicate that the proposed measurement apparatus has achieved outstanding competitive technical level of same kind products in international market and thus has ideal im- plications for mass production.

大容量压缩空气储能系统空气透平工艺结构及运行特性研究

针对大容量(300MW级)蓄热式压缩空气储能系统的空气透平工作组,定量评估了高温方案(315℃)和中温方案(175℃)对透平的工艺流程结构和关键技术参数的影响,探讨了全工况下配气运行方式对透平性能的影响。研究表明,高温方案下透平工作组的工艺结构简单,但储换热系统的初投资高;高温方案的气耗率低,电电转化率高;节流+补气调节方式的高效运行区间最大。

生物基功能环保纱线的开发与应用现状

为深入探究生物基功能环保纱线的工艺措施,通过查阅大量有关文献进行归纳总结,得出不同类别生物基纤维的预处理、加工过程工艺参数设定、纺纱环境及工艺原则等。指出:对于强力比较低的生物基纤维需要进行自由开松,以避免损伤纤维;对于回潮率较高的生物基纤维,需控制好车间温湿度,使纤维最好处于放湿状态,以防止纤维缠绕胶辊;对于可纺性能比较差的生物基纤维,为不影响成纱强度,其占比不超过30%;对于易产生静电的生物基纤维,为提高其蓬松性,需对纤维喷洒预处理剂,且密封处理24 h以上;对于长度较长的生物基纤维,为减小纤维损伤,开清棉采用“以梳代打,减少落棉,降低打手速度”的原则,梳棉工序采取“低速度,大隔距,适当增加锡林刺辊线速比”的原则,实现纤维快速转移。

铝-石墨烯复合镀层对7075铝合金硬度优化研究

在有机体系下制备了铝-石墨烯复合镀层,研究了7075铝合金硬度和耐磨性的优化工艺。采用正交试验研究了工艺参数对复合材料表面硬度和耐磨性的影响。采用单因素试验分析了石墨烯浓度和电流密度对硬度的影响规律。利用SEM、XRD、Raman光谱分别对复合镀层的微观形貌、相结构及石墨烯的存在进行表征分析。结果表明:各工艺参数对复合材料硬度和耐磨性的影响顺序均为石墨烯浓度>电流密度>电镀时间>搅拌速度。随着石墨烯浓度和电流密度的增大,复合材料硬度均出现先升后降的变化趋势。在优化工艺下,复合材料表面硬度较基体硬度提升了229.9%,而其摩擦系数较基体的降低了90.1%,说明了石墨烯优异的机械强度和自润滑性强化了复合材料的力学性能。

牛大力热风干燥工艺参数优化

热风干燥有利于提高鲜制牛大力干燥时的干燥速率和产品品质。为此,对新鲜的牛大力进行单因素热风干燥实验,结果表明:干燥过程中热风温度越高、切片厚度越薄时,牛大力的干燥速率越快;而热风温度过高时,牛大力切片表面会发生褐化和裂纹。结合响应面优化分析方法,建立各因素与指标值之间的回归分析模型。由响应面优化分析和实验结果可知:当热风温度为50~60℃、切片厚度为3~7 mm和热风风速为0.5~1.5 m/s时,牛大力热风干燥的最佳干燥参数为:热风温度60℃,切片厚度5 mm,热风风速1.116 m/s。

材料物性参数对双层微管气体辅助共挤出胀大的影响

建立了单腔双层微管的传统微共挤和气辅微共挤流动模型,采用数值模拟技术研究了零剪切黏度(η_(0))、松弛时间(λ)、材料参数ε和ξ等对挤出胀大率的影响规律。结果表明,传统微共挤过程中,挤出胀大率受η_(0)和λ的影响较大,随着外层熔体η_(0)增大,由29.15%增大至43.77%后趋于稳定;挤出胀大率受ε和ξ的影响较小,随着ε和ξ的增大略有减小,胀大率在37%~39%区间变化。而气辅共挤过程中,当η_(0)、λ、ε和ξ变化时,挤出胀大率始终接近零,无明显胀大和变形现象。

基于知识图谱的SMT产线工艺推荐与优化

面向复杂电路板组件产品,依赖人工经验设计表面贴装技术(SMT)工艺的传统方法存在准确度与适配度低、设计效率低、实物试错成本高等问题,提出了一种基于知识图谱的SMT产线工艺推荐与优化算法。建立知识图谱系统描述SMT产线工艺参数之间的关系,利用随机森林算法计算各个参数重要度,更新参数权重推荐合适参数,并与完全平均加权法对比,验证了其准确性与稳定性。

热塑性聚氨酯-聚酯复合面料开发及其服用性能研究

为提升聚酯面料防水性能,扩展聚酯面料应用范围,将热塑性聚氨酯(TPU)薄膜与聚酯面料进行复合,通过正交实验分析复合温度、TPU膜厚度和复合压力对复合产品剥离强力、透气率、柔软度、抗静电性、透光性、紫外防护性能、防水性、透湿性的影响,通过研究得到结论为:TPU与聚酯复合面料的紫外防护性、防水性和静电荷衰减速度有所提升,透气率、柔软度、透湿率有所下降,透光性变化不大;TPU膜厚度和复合压力对复合产品综合服用性能影响同等重要,而温度影响略小;复合工艺为温度130℃、TPU膜厚度0.5mm、压力15MPa时复合面料综合服用性能最佳。

基于人工智能的自动应变定量技术评价慢性肾病患者早期心肌损伤的临床价值

目的探讨基于人工智能的自动应变定量技术评价慢性肾病(CKD)患者早期心肌损伤的临床价值。方法选取2021年7月至2023年7月我院收治的CKD患者125例为研究对象,根据CKD分期分别纳入A组(2~3期,67例)、B组(4~5期,58例),另选取同期45例健康体检者为对照组。比较3组二维超声心动图参数[左室射血分数(LVEF)、舒张末期室间隔厚度(IVSd)、舒张末期左室后壁厚度(LVPWd)、左心室舒张末期内径(LVEDD)、右心室内径(RVD)]、血清N末端脑钠肽前体(NT-pro BNP)水平、自动及手动应变定量技术应变参数[左心室整体纵向收缩期峰值应变(LVGLS)、右心室整体纵向收缩期峰值应变(RVGLS)、左房储备期纵向应变(LASr)、左房管道期纵向应变(LAScd)、左房收缩期纵向应变(LASct)],采用Pearson分析自动应变参数与手动应变参数、二维超声心动图参数及血清NT-pro BNP水平的相关性,比较LVGLS、RVGLS、左房应变分析的手动、自动应变分析时间,采用受试者工作特征(ROC)曲线分析自动应变参数联合检测对CKD患者早期心肌损伤的诊断价值。结果B组LVEF水平低于A组、对照组,B组IVSd、LVPWd、LVEDD、RVD及血清NT-pro BNP水平高于A组、对照组,且A组高于对照组,差异有统计学意义(P<0.05);B组自动及手动LVGLS、RVGLS、LAScd、LASct均高于A组、对照组,B组LASr低于A组、对照组,且A组自动LVGLS、RVGLS、LAScd、LASct高于对照组,LASr低于对照组,A组手动LAScd、LASct高于对照组,LASr低于对照组,差异有统计学意义(P<0.05);自动分析各应变参数与手动分析各参数均呈正相关(r=0.852,0.721,0.605,0.630,0.627,P<0.05);自动LVGLS、RVGLS、LAScd、LASct与LVEF呈负相关(r=-0.659,-0.598,-0.612,-0.601,P<0.05),与NT-pro BNP呈正相关(r=0.643,0.638,0.622,0.647,P<0.05);自动LASr与LVEF呈正相关(r=0.629,P<0.05),与NT-pro BNP呈负相关(r=-0.658,P<0.05)。自动病变分析时间较手动分析时间明显减少,差异有统计学意义(P<0.05)。LVGLS诊断CKD患者早期心肌损伤的曲线下面积(AUC)为0.928(95%CI:0.889~0.957),约登指数为0.736,最佳诊断敏感度为87.20%,特异度为86.40%,差异有统计学意义(P<0.05)。结论自动应变定量技术应变参数联合检测对CKD患者早期心肌损伤具有一定诊断价值,可作为临床评估早期心肌损伤的有效检查方式,并对后续治疗具有一定指导价值。