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细纱压力棒上销的应用实践

棉纺织技术 2009年第11期37卷 42-44页

作者：赵连民山东滨州德民新纺织有限公司

探讨细纱压力棒上销的使用效果。针对细纱压力棒上销使用中存在的问题,对钳口隔距、后区牵伸倍数、粗纱捻系数及粗纱定量进行了试验优选。结果表明:细纱压力棒上销能够改善成纱条干,降低常发性纱疵,并能适当提高粗纱定量,增加前纺供应... 详细信息

探讨细纱压力棒上销的使用效果。针对细纱压力棒上销使用中存在的问题,对钳口隔距、后区牵伸倍数、粗纱捻系数及粗纱定量进行了试验优选。结果表明:细纱压力棒上销能够改善成纱条干,降低常发性纱疵,并能适当提高粗纱定量,增加前纺供应能力。使用中应对相关工艺参数合理选择,才能解决牵伸不开、断头多等问题,充分发挥压力棒上销的作用。

关键词：细纱机压力棒上销钳口隔距后区牵伸倍数粗纱捻系数粗纱定量

Thermolite纤维与兔毛混纺针织纱的研制

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棉纺织技术 2005年第12期33卷 24-26页

作者：赵连民李贵权赵伟山东基德生态科技有限公司

介绍了Thermolite纤维和安哥拉兔毛的性能特点,分析了纤维性能特点对纺纱工艺及成纱质量的影响。Thermolite纤维长度整齐度好,安哥拉兔毛有纤维长度长、长度差异大、静电现象严重的特点,因此,原料在上机前应加抗静电剂处理,同时车间相... 详细信息

介绍了Thermolite纤维和安哥拉兔毛的性能特点,分析了纤维性能特点对纺纱工艺及成纱质量的影响。Thermolite纤维长度整齐度好,安哥拉兔毛有纤维长度长、长度差异大、静电现象严重的特点,因此,原料在上机前应加抗静电剂处理,同时车间相对湿度应控制在67%左右,以减轻静电对生产的不良影响。

关键词： Thermolite 兔毛纺纱工艺性能特点

改良第2足趾近侧趾骨间关节移植重建手指近侧指骨间关节

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中华显微外科杂志 2021年第4期44卷 378-383页

作者：曹学新陈一衡涂龙赵连民池征璘江苏省宿迁市第三医院修复重建显微外科中心江苏宿迁223800 温州医科大学附属第二医院手、显微外科浙江温州325000

目的探讨改良第2足趾近侧趾(指)骨间关节(PIPJ)移植重建手指PIPJ的方法和临床疗效。方法自2017年5月至2020年3月,收治13例手指PIPJ缺损的患者,均为创伤性损伤一期修复术后发生的PIPJ缺损,受伤机制为:绞轧伤5例,电锯伤4例,冲压伤2例,挤压... 详细信息

目的探讨改良第2足趾近侧趾(指)骨间关节(PIPJ)移植重建手指PIPJ的方法和临床疗效。方法自2017年5月至2020年3月,收治13例手指PIPJ缺损的患者,均为创伤性损伤一期修复术后发生的PIPJ缺损,受伤机制为:绞轧伤5例,电锯伤4例,冲压伤2例,挤压伤2例,其中示指7例,中指3例,环指3例。手术时间为一期手术后3-7个月,应用改良吻合血管的第2足趾PIPJ进行移植重建,取伤指同侧第2足趾10例,取对侧第2足趾3例。移植关节均携带观察皮岛,面积为1.0 cm×1.5 cm~1.0 cm×2.0 cm。足趾供区继发骨缺损均取髂骨条植骨重建,切取髂骨条长度为4.0-6.0 cm,供区创面均采用[母]趾腓侧岛状皮瓣转移修复,面积1.1 cm×1.6 cm~1.1 cm×2.1 cm。术后早期进行功能锻炼,并通过门诊、电话及微信传送照片的方式进行随访,内容包括重建手指和供足的功能、外形恢复情况。结果13例移植的关节和[母]趾腓侧岛状皮瓣均全部成活,移植关节和供趾均骨性愈合,愈合时间为8~12周,平均10周。其中3例关节和肌腱粘连严重,二期行松解术。术后所有患者获得随访10~18个月,重建的指PIPJ未发生退行性变,主动活动度为:屈曲45°-90°,伸直0°-10°,活动度平均66.3°,按中华医学会手外科学会上肢部分功能评定试用标准评定:优7例,良4例,可2例。供趾外形良好,远期随访行走功能正常。髂腹股沟供区只留1条线形瘢痕,无明显不适。结论应用改良吻合血管的第2足趾PIPJ移植重建缺损的手指PIPJ,能够恢复手指骨间关节功能,具有良好的效果。足趾供区同时行髂骨条植骨重建加[母]趾腓侧岛状皮瓣转移修复,能够保留足趾的外形和大部分功能,达到供、受区平衡。

关键词：近侧指骨间关节缺损趾骨间关节重建移植

Recycling arsenic-containing bio-leaching residue after thermal treatment in cemented paste backfill:Structure modification,binder properties and environmental assessment

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2136-2147页

作者： Dengfeng zhao Shiyu Zhang Yingliang zhao Department of Mining Engineering Lyuliang UniversityLvliang 033000China School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 00852China

The substantial arsenic(As)content present in arsenic-containing bio-leaching residue(ABR)presents noteworthy environ-mental challenges attributable to its inherent instability and susceptibility to *** its elevated calcium sulfate content,ABR exhibits considerable promise for industrial *** study delved into the feasibility of utilizing ABR as a source of sulfates for producing super sulfated cement(SSC),offering an innovative binder for cemented paste backfill(CPB).Thermal treatment at varying temperatures of 150,350,600,and 800℃ was employed to modify ABR’s *** investigation encompassed the examination of phase transformations and alterations in the chemical composition of As within ***,the hydration characteristics of SSC utilizing ABR,with or without thermal treatment,were studied,encompassing reaction kinetics,setting time,strength development,and *** findings revealed that thermal treatment changed the calcium sulfate structure in ABR,consequently impacting the resultant sample ***,calcination at 600℃ demonstrated optimal modification effects on both early and long-term strength *** enhanced performance can be attributed to the augmented formation of reaction products and a densified ***,the thermal treatment elicited modifications in the chemical As fractions within ABR,with limited impact on the As immobilization capacity of the prepared binders.

关键词： cemented paste backfill bio-leaching residue arsenic immobilization binder hydration calcination

Design of a Multijunction Antenna Unit for EAST Lower Hybrid Current Drive

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Design of a Multijunction Antenna Unit for EAST Lower Hybrid...

Automatic modeling algorithm of stochastic error for inertial sensors

安徽新能源技术创新与产业发展博士科技论坛

作者： JIA Hua LIU Fukun zhao lianmin WANG XiaojieLIU Liang WANG Mao KUANG Guangli (Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China )

A multijunction antenna unit has been designed and will be used to fabricate the new 4.6GHz Lower Hybrid Current Drive(LHCD) launcher for the long pulse operation of the Experimental Advanced Superconducting Tokamak (EAST).In this paper,the construction and design method of the multijunction antenna unit are described,and then the reflection coefficients of the unit with the matched load and with the plasma load are analyzed and discussed respectively by using High Frequency Structure Simulator(HFSS) code and by using numerical calculation based on linear coupling *** simulation result shows that the return loss of the antenna unit keeps below -25dB in a bandwidth of lOOMHz and the power is distributed equally in the secondary waveguides of the *** calculation result also shows that the unit has good coupling property in a wide range of tokamak plasma parameters.

关键词： EAST multijunction antenna unit launcher LHCD

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Control Theory and Technology 2024年第1期22卷 81-91页

作者： Luodi zhao Long zhao School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China Digital Navigation Center Beihang UniversityBeijing100191China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing100191China

This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.

关键词： GMWM Stochastic process Inertial sensor Sensor calibration Error model Allan variance

Meeting the challenges of invasive alien species

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National Science Review 2024年第3期11卷 296-298页

作者： Weijie zhao NSR news

The Xinjiang Uygur Autonomous Region of China is famous for its tomato production. Abundant sunshine, large day–night temperature difference and the abundant irrigation by snowmelt from the Tianshan Mountains produce...

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Ling-Ling Chen: RNA has its own features;don't study it as a protein

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National Science Review 2024年第2期11卷 301-305页

作者： Weijie zhao NSR

Non-coding RNA(ncRNA) has been a very active research area over the past 30 years. From small nc RNA – the discovery of RNA interference won the lead researchers the Nobel Prize, to long ncRNA(lncRNA), which has attracted much attention in recent years, various nc RNAs participate in all kinds of biological processes and show a variety of biomedical application prospects.

关键词： RNA

Giant Flexoelectric Effect in Snapping Surfaces Enhanced by Graded Stiffness

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Acta Mechanica Solida Sinica 2024年第4期37卷 528-540页

作者： Chuo zhao Department of Aeronautics Imperial College LondonSouth Kensington CampusLondonSW72AZUK

Flexoelectricity is present in nonuniformly deformed dielectric materials and has size-dependent properties, making it useful for microelectromechanical systems. Flexoelectricity is small compared to piezoelectricity;therefore, producing a large-scale flexoelectric effect is of great interest. In this paper, we explore a way to enhance the flexoelectric effect by utilizing the snap-through instability and a stiffness gradient present along the length of a curved dielectric plate. To analyze the effect of stiffness profiles on the plate, we employ numerical parameter continuation. Our analysis reveals a nonlinear relationship between the effective electromechanical coupling coefficient and the gradient of Young’s modulus. Moreover, we demonstrate that the quadratic profile is more advantageous than the linear profile. For a dielectric plate with a quadratic profile and a modulus gradient of − 0.9, the effective coefficient can reach as high as 15.74 pC/N, which is over three times the conventional coupling coefficient of piezoelectric material. This paper contributes to our understanding of the amplification of flexoelectric effects by harnessing snapping surfaces and stiffness gradient design.

关键词： Functionally graded material Flexoelectricity Numerical continuation Snap-through instability