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High-efficiency theoretical model for predicting contact forces and deformations in threaded connections under complex loading 认领 引用
1
作者 Zhao Liu Zeyu Qi +1 位作者 Xuefeng Wang Caishan Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期490-503,共14页
Threaded connection is a common structural form in mechanical engineering,with their complex nonlinear behavior under combined loading critically affecting structural performance.While existing simplified models and f... Threaded connection is a common structural form in mechanical engineering,with their complex nonlinear behavior under combined loading critically affecting structural performance.While existing simplified models and finite element analysis(FEA)methods describe force distribution under single loading conditions,accurately modeling threaded connections under complex loading remains challenging.This paper proposes a simplified theoretical model to efficiently predict contact forces and deformation distributions under tension,torsion,bending,and shear.The model treats bolt and nut bodies as Euler-Bernoulli beams and represents thread stiffness using equivalent trapezoidal cantilever beams,reducing computational complexity while retaining essential mechanical characteristics.The paper introduces reference helical curves and derives a deformation coordination relationship based on contact constraints.The model’s calculations are validated against FEA results,demonstrating both high precision and significant computational efficiency under complex loading conditions.This work provides an efficient and reliable tool for analyzing threaded connections,offering promising engineering applications. 展开更多
关键词 Thread connection Contact force distribution Deformation coordination relationship Theoretical modeling Finite ele-ment analysis
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Modified anal fistula clip:A safe and effective alternative to incision and thread hanging for anal fistula 认领 引用
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作者 Ying Han Xiao-Li Fang +6 位作者 Kun Tang Ran Tang Xian-Shui Mei Run Zhang Li Chen Jian-Min Wang Ming Li 《World Journal of Gastrointestinal Surgery》 SCIE 2026年第7期309-317,共9页
BACKGROUND Anal fistula is a common anorectal disorder,for which incision and thread hanging(ITH)remains a widely used treatment.However,ITH is often associated with substantial postoperative discomfort and carries a ... BACKGROUND Anal fistula is a common anorectal disorder,for which incision and thread hanging(ITH)remains a widely used treatment.However,ITH is often associated with substantial postoperative discomfort and carries a risk of anal sphincter injury,potentially compromising functional outcomes.The anal fistula clip(AFC)is a novel surgical technique designed to occlude the internal orifice of the fistula,eliminate infection source,and preserve anal sphincter function.AIM To compare the efficacy and safety between AFC and ITH in a randomized,single-center study focusing on short-term postoperative outcomes.METHODS A total of 70 patients with anal fistula who underwent surgery from August 2019 to January 2025 were randomly assigned to the ITH or AFC group.The primary outcomes included cure rates,pain scores,anal sphincter function,and complications.Patients were followed up postoperatively for 6 months.RESULTS All surgeries were successfully performed,with postoperative cure rates exceeding 90%in both groups.No severe complications or postoperative fecal incontinence occurred.Compared with the ITH group,the AFC group demonstrated better outcomes in early postoperative pain(P<0.01),wound healing time(P<0.01),and anal sphincter function preservation(P<0.05).CONCLUSION Compared with ITH,AFC may reduce postoperative pain,shorten healing time,preserve function,and minimize complications.AFC may be safe and effective;however,larger studies with longer follow-up are needed. 展开更多
关键词 Anal fistula clip Incision and thread hanging treatment Anal fistula Anal sphincter function Postoperative pain Complications
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Corrosion failure analysis of J55 tubing thread fastener in an electric pump well in an oil field 认领 引用
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作者 QI Yameng ZHOU Xiong 《Baosteel Technical Research》 CAS 2026年第1期35-39,共5页
The J55 tubing thread fastener in an electric pump well experienced corrosion failure.The causes of the failure were investigated through physical and chemical property tests,corrosion product analysis,and microbial a... The J55 tubing thread fastener in an electric pump well experienced corrosion failure.The causes of the failure were investigated through physical and chemical property tests,corrosion product analysis,and microbial analysis.The results show that the metallographic structure and composition of the J55 tubing were normal.CO 2 corrosion was not the main cause of the thread fastener failure.The actual cause of the corrosion failure was microbiological corrosion,such as sulfate-reducing bacteria,thiosulfate-reducing bacteria,and iron-oxidizing bacteria. 展开更多
关键词 electric pump well tubing thread corrosion perforation microbiological corrosion failure analysis
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Threads of Revival 认领 引用
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作者 HU FAN 《China Today》 2026年第1期50-51,共2页
E-commerce has transformed Caoxian into a hub of traditional Chinese attire.STEPPING inside Caoxian’s Youai Cloud Warehouse,a livestreaming base dedicated to hanfu(traditional clothing),it feels less like a clothing ... E-commerce has transformed Caoxian into a hub of traditional Chinese attire.STEPPING inside Caoxian’s Youai Cloud Warehouse,a livestreaming base dedicated to hanfu(traditional clothing),it feels less like a clothing warehouse and more like a time capsule.Thousands of intricately embroidered garments line the racks-from elegant horse-face skirts to modernised editions of traditional Chinese clothing. 展开更多
关键词 livestreaming base clothing warehouse hanfu livestreaming caoxian threads revival youai cloud warehousea e commerce
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基于RT-Thread操作系统的白坯布缺陷检测系统的设计 认领 引用
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作者 汤喆 魏龙辉 +2 位作者 贾清林 刘天琦 陈磊 《现代信息科技》 2026年第14期178-184,192,共7页
针对纺织行业白坯布生产过程中人工缺陷检测效率低、漏检率高、检测标准不统一的问题,设计了一款基于RT-Thread操作系统的嵌入式白坯布缺陷检测系统。系统在架构上创新性地融合了“粗检—精检”两级视觉检测策略:前端OpenMV模块完成高... 针对纺织行业白坯布生产过程中人工缺陷检测效率低、漏检率高、检测标准不统一的问题,设计了一款基于RT-Thread操作系统的嵌入式白坯布缺陷检测系统。系统在架构上创新性地融合了“粗检—精检”两级视觉检测策略:前端OpenMV模块完成高速缺陷粗检与触发,后端STM32H743主控基于RT-Thread NNOM软件包首次实现了多类白坯布缺陷的端侧INT8量化模型部署与实时精检分类。同时,系统集成了步进电机传输对位、自动打标、本地Excel存储及OneNET云平台上传功能,形成了一体化的闭环检测解决方案。测试结果表明,该系统可实现裂缝、油污、胶水等多种缺陷的快速检测与精准分类,缺陷粗检响应时间≤180 ms,精检分类准确率≥94%,满足纺织生产线现场实时检测需求,相比传统人工检测大幅提升了效率与准确率,为中小纺织企业提供了低成本、轻量化、高集成的智能化检测新方案。 展开更多
关键词 RT-Thread STM32H743VGT6 缺陷检测 嵌入式机器视觉 深度学习 OneNET云平台
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Clinical observation on prognosis of mixed hemorrhoids treated with polidocanol injection combined with automatic elastic thread ligation operation 认领 引用 被引量：7
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作者 Yan-Mei Huang Dong Ouyang 《World Journal of Gastrointestinal Surgery》 SCIE 2025年第1期209-216,共8页
BACKGROUND A total of 100 patients diagnosed with mixed hemorrhoids from October 2022 to September 2023 in our hospital were randomly divided into groups by dice rolling and compared with the efficacy of different tre... BACKGROUND A total of 100 patients diagnosed with mixed hemorrhoids from October 2022 to September 2023 in our hospital were randomly divided into groups by dice rolling and compared with the efficacy of different treatment options.AIM To analyze the clinical effect and prognosis of mixed hemorrhoids treated with polidocanol injection combined with automatic elastic thread ligation operation(RPH).METHODS A total of 100 patients with mixed hemorrhoids who visited our hospital from October 2022 to September 2023 were selected and randomly divided into the control group(n=50)and the treatment group(n=50)by rolling the dice.The procedure for prolapse and hemorrhoids(PPH)was adopted in the control group,while polidocanol foam injection+RPH was adopted in the treatment group.The therapeutic effects,operation time,wound healing time,hospital stay,pain situation(24 hours post-operative pain score,first defecation pain score),quality of life(QOL),incidence of complications(post-operative hemorrhage,edema,infection),incidence of anal stenosis 3 months post-operatively and recurrence rate 1 year post-operatively of the two groups were compared.RESULTS Compared with the control group,the total effective rate of treatment group was higher,and the difference was significant(P0.05);There was no significant difference in the incidence of anal stenosis 3 months after operation and the recurrence rate 1 year after operation between the two groups(P>0.05).CONCLUSION For patients with mixed hemorrhoids,the therapeutic effect achieved by using polidocanol injection combined with RPH was better.The wounds of the patients healed faster,the postoperative pain was milder,QOL improved,and the incidence of complications was lower,and the short-term and long-term prognosis was good. 展开更多
关键词 Mixed hemorrhoids Polidocanol injection Automatic elastic thread ligation operation Postoperative hemorrhage The degree of pain Recurrent rate
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基于Cortex-M4内核的RT-Thread上下文切换机制剖析 认领 引用 被引量：1
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作者 徐丽华 王宜怀 奚圣鑫 《计算机应用与软件》 北大核心 2025年第1期213-216,302,共4页
RT-Thread是源码公开的国产嵌入式实时操作系统。基于Cortex-M4内核,对RT-Thread通过底层PendSV中断进行上下文切换的过程进行了剖析,从指令级别对上下文切换的实现机制进行了研究,为深入理解内核调度机制的实现提供了参考,也为RT-Threa... RT-Thread是源码公开的国产嵌入式实时操作系统。基于Cortex-M4内核,对RT-Thread通过底层PendSV中断进行上下文切换的过程进行了剖析,从指令级别对上下文切换的实现机制进行了研究,为深入理解内核调度机制的实现提供了参考,也为RT-Thread的应用与推广提供了技术基础。 展开更多
关键词 嵌入式实时操作系统 RT-Thread 任务调度 上下文切换
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A novel reverse-flow friction stir lap welding of 2024 aluminum alloys based on a right-left thread X-shape pin 认领 引用
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作者 Zhiqing Zhang Kaicheng Lu +5 位作者 Shude Ji Yumei Yue Qi Song Chen Jin Zhenyang Li Lin Ma 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第25期92-106,共15页
For friction stir lap welding (FSLW) process by the rotating pin greatly inserting into the bottom plate, the bending-down morphology of hook helps to obtain a high-strength lap joint, and can be more conducive to the... For friction stir lap welding (FSLW) process by the rotating pin greatly inserting into the bottom plate, the bending-down morphology of hook helps to obtain a high-strength lap joint, and can be more conducive to the joint strength when the tensile-fractured path is located in the top plate. In light of this, the reverse-flow FSLW (RF-FSLW) by a newly designed rotating tool with a right-left threaded X-shape pin (X-pin) was employed to weld 2024-T4 aluminum alloys with the same plate thickness, and the flow field simulation, in situ tensile test and EBSD analysis were utilized to understand the relations among the formation features, the fracture features and the joint strengths. The results indicated that under the integrated effects of the bending-down shape of hook, the bulging shape of nugget zone (NZ) and the bending-up shape of beginning part of cold lap near NZ outline, the RF-FSLW joint was tensile fractured in the top plate of joint. For the RF-FSLW joint, its maximum tensile strength was 412 MPa, and the corresponding joint efficiency (92.8%) was larger than that of reported friction stir welded joint of 2024 aluminum alloys in T temper condition. The RF-FSLW technology by the right-left threaded X-pin puts forward an extremely effective way for obtaining the superb-strength lap joint of aluminum alloys. 展开更多
关键词 Reverse-flow friction stir lap welding 2024-T4 aluminum alloy Right-left threaded X-pin Hook Tensile strength
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Three-dimensional location approach with silk thread guided hepatectomy for liver tumor 认领 引用
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作者 Zhi-Hong Zhang Qing-Bo Feng +2 位作者 Chuang Jiang Ji-Wei Huang Jia-Xin Li 《World Journal of Gastroenterology》 SCIE CAS 2025年第8期66-71,共6页
BACKGROUND Intraoperative determination of resection margin and adequate residual liver parenchyma are the key points of hepatectomy for the treatment of liver tumors.Intraoperative ultrasound and indocyanine green fl... BACKGROUND Intraoperative determination of resection margin and adequate residual liver parenchyma are the key points of hepatectomy for the treatment of liver tumors.Intraoperative ultrasound and indocyanine green fluorescence navigation are the most commonly used methods at present,but the technical barriers limit their promotion.AIM To evaluate the value of the three-dimensional location approach with silk thread(3D-LAST)in precise resection of liver tumors.METHODS From September 2020 to January 2022,8 patients with liver tumors including hepatocellular carcinoma,intrahepatic cholangiocarcinoma,hilar cholangiocar-cinoma,and gastric cancer liver metastasis were included in this study.All patients underwent 3D-LAST in precise resection of liver tumors.RESULTS All patients(8/8,100%)underwent the operation successfully without any complications.During the mean follow-up of 8.7 months,all patients survived without tumor recurrence.CONCLUSION In conclusion,the 3D-LAST is a safe and effective new method for liver intraop-erative navigation,which is practical and easy to promote.Core Tip:The aim of this study is to evaluate the value of the three-dimensional location approach with silk thread(3D-LAST)in precise resection of liver tumors.Eight patients with liver tumors including hepatocellular carcinoma,intrahepatic cholangiocarcinoma,hilar cholangiocarcinoma,and gastric cancer liver metastasis underwent the operation successfully without any complications.During the mean follow-up of 8.7 months,all patients survived without tumor recurrence.In conclusion,the 3D-LAST is a safe and effective new method for liver intraoperative navigation,which is practical and easy to promote.INTRODUCTION Hepatectomy is widely used for the treatment of liver tumors.In recent decades,the concept and practice of hepatectomy have developed from irregular,regular and anatomical to the current precise resection.Necessary assistive technologies have enabled these advances.Intraoperative ultrasound(IOUS)localization and indocyanine green(ICG)fluorescence imaging guidance are two frequently-used approaches for laparoscopic hepatectomy[1,2].IOUS is an invaluable auxiliary means widely accepted in surgery for real-time diagnostic information to determine resection range and navigate the surgical path[3].However,the major limitation of IOUS is the time cost during the procedure for paging the sono-graphers and the difficulty of deciphering two dimensional images[4].ICG is a non-toxic water-soluble fluorophore that reveals fluorescence under the near-infrared spectrum[5].Since liver tissue penetration is limited to 5 to 10 mm,that restricted the visualization of deeper tumors by ICG excitation,thereby interfering with its application in laparoscopic hepatectomy[6].IOUS and ICG navigation require specific technical equipment,making implementation difficult in many centers.And these techniques will significantly increase the operation time.Three-dimensional(3D)visualization involves extracting features and producing volumetric images based on computed tomography(CT)through a computer postprocessing technique.This tool offers a reasonable approach to the clinical decision for the potential to display the complex internal anatomy in an intuitive and stereoscopic manner[7].In the past few decades,applying 3D simulation software for liver volume calculation,virtual simulation surgery,portal hypertension monitor,and surgical navigation has proven to be safe and effective[8].Therefore,we propose a new method to find obvious anatomical markers and calculate the resection range according to 3D positioning before operation.During the operation,the scope of resection was delineated with silk thread,and resection was performed.This is a new practical approach,which we named as 3D location approach with silk thread(3D-LAST).RESULTS During the study period from September 2020 to January 2022,5 patients with hepatocellular carcinoma,1 patient with intrahepatic cholangiocarcinoma,1 patient with hilar cholangiocarcinoma,and 1 patient with gastric cancer liver metastasis were assessed for liver resection.There were 5 males and 3 females.The mean age of these patients was 54.3±10.2 years(34-66 years).Preoperative 3D positioning was conducted and the scope of resection was delineated with a surgical suture successfully performed in all 8 patients without complications.The treatment results of these 8 patients are shown in Table 1.The 90-day operative mortality was zero.Complications worse than Dindo-Clavien IIIa was not observed at a mean follow-up time of 8.7 months(4-16 months),there was no evidence of tumor recurrence or extrahepatic metastasis.At the time of reporting,the patients are all alive and lead normal lives.We take one patient as an example,58-year-old male,who found a liver lesion 10 months after gastric cancer surgery.Enhanced CT showed that the lesion was located in the liver S5,about 1.5 cm in diameter,and considered metastatic lesions.We performed 3D-LAST guided hepatectomy on this patient(Figure 1).Other representative 3D-LAST surgical procedures are shown in Figure 2. 展开更多
关键词 Hepatectomy Laparoscopy Liver tumor Three dimensional Silk thread
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基于RT-Thread的自平衡自行车系统 认领 引用
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作者 陈欣然 董玉华 +1 位作者 薛严冰 冯冲 《大连民族大学学报》 CAS 2025年第3期209-215,共7页
针对裸机模式下开发的自平衡自行车控制系统实时性差、开发周期长、缺乏可移植性等问题,设计了基于RT-Thread的自平衡自行车控制系统。系统以STM32F407为主控芯片,移植RT-Thread对系统软硬件资源进行分配管理,利用RT-Thread线程调度和... 针对裸机模式下开发的自平衡自行车控制系统实时性差、开发周期长、缺乏可移植性等问题,设计了基于RT-Thread的自平衡自行车控制系统。系统以STM32F407为主控芯片,移植RT-Thread对系统软硬件资源进行分配管理,利用RT-Thread线程调度和通信机制实现高实时性控制,同时设计调试辅助系统缩短系统开发周期。实验结果表明:车身在5°的初始状态下起摆可在2.15 s内回正至0°,静止状态车体摆幅在±0.4°,运动状态下车体摆幅不超过±3°,系统线程切换和线程抢占时间最大为10.1μs和12μs,证明该系统平衡控制稳定可靠,实时响应性能较高。 展开更多
关键词 RT-Thread 串级PID Mahony互补滤波 微信小程序 OneNET
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基于RT-Thread的实训室环境监测系统设计 认领 引用 被引量：2
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作者 范宏令 兰岚 刘霄 《山西电子技术》 2025年第1期35-37,66,共3页
实训室是职业院校进行实践教学和科研的重要场所,是改革校企合作模式、培养创新型复合人才和全面提高学生综合职业技能的重要支撑和保障,在职业教育中有着重要地位和作用,实训室安全直接关系着广大师生的生命财产安全,关系着学校和社会... 实训室是职业院校进行实践教学和科研的重要场所,是改革校企合作模式、培养创新型复合人才和全面提高学生综合职业技能的重要支撑和保障,在职业教育中有着重要地位和作用,实训室安全直接关系着广大师生的生命财产安全,关系着学校和社会的安全稳定。本文基于国产物联网操作系统RT-Thread,设计一款实训室环境监测系统,为实训室管理工作提供方便,保障广大师生的生命财产安全。 展开更多
关键词 环境监测 RT-Thread NBIOT ZIGBEE 阿里云物联网平台
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Research on the mechanism of high-performance gas sealing premium threaded connections 认领 引用 被引量：1
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作者 SUN Jian’an ZHANG Zhonghua GAO Zhan 《Baosteel Technical Research》 CAS 2025年第1期28-40,共13页
In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequen... In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs. 展开更多
关键词 sealing performance premium threaded connection damage mechanism half-size evaluation test
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基于RT-Thread和STM32的多协议工业以太网控制系统设计 认领 引用
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作者 焦钰龙 陈华敏 《计算机应用文摘》 2025年第21期145-148,共4页
文章基于国产RT-Thread操作系统,构建了覆盖“芯片+操作系统+应用”的立体技术生态链。其采用模块化、可扩展架构设计,具备良好的跨硬件平台适应能力与多样化应用场景支持。在以太网协议移植过程中,文章通过集成RT-Thread底层网络驱动... 文章基于国产RT-Thread操作系统,构建了覆盖“芯片+操作系统+应用”的立体技术生态链。其采用模块化、可扩展架构设计,具备良好的跨硬件平台适应能力与多样化应用场景支持。在以太网协议移植过程中,文章通过集成RT-Thread底层网络驱动并配置相关网络组件,实现了稳定可靠的多TCP连接,完成了Modbus-TCP总线通信、FTP文件传输服务器及Web服务器的开发,最终设计并实现了基于RT-Thread与STM32的多协议工业以太网控制系统。该系统具有开发门槛低、设计周期短和成本低等特点,展现出良好的应用前景。 展开更多
关键词 嵌入式 RT-Thread系统 工业以太网 LwIP栈 Modbus总线
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基于RT-Thread事件集的多线程相互同步设计方法研究 认领 引用
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作者 索明何 黄鑫 +2 位作者 王宜怀 施连敏 张建 《电脑与信息技术》 2025年第4期71-74,共4页
针对嵌入式系统设计中的多线程相互同步实现问题,提出基于实时操作系统事件集的一般设计算法,给出利用RT-Thread事件集的实现方法和应用实例,最后分析一般设计算法中存在的极端潜在风险,并加以改进,确保设计的可靠性。实践结果表明,所... 针对嵌入式系统设计中的多线程相互同步实现问题,提出基于实时操作系统事件集的一般设计算法,给出利用RT-Thread事件集的实现方法和应用实例,最后分析一般设计算法中存在的极端潜在风险,并加以改进,确保设计的可靠性。实践结果表明,所提出的设计方法具有很好的实时性和可靠性,并具有一定的通用性和参考价值。 展开更多
关键词 多线程相互同步 事件集 事件标志 可靠性
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Threads of Revival 认领 引用
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作者 HU FAN 《ChinAfrica》 2025年第9期31-33,共3页
When one steps inside Caoxian’s Youai Cloud Warehouse,a livestreaming base dedicated to hanfu,it feels less like a clothing warehouse and more like a time capsule.Thousands of intricately embroidered garments line th... When one steps inside Caoxian’s Youai Cloud Warehouse,a livestreaming base dedicated to hanfu,it feels less like a clothing warehouse and more like a time capsule.Thousands of intricately embroidered garments line the racks-from elegant horse-face skirts to modernised editions of traditional Chinese clothing. 展开更多
关键词 livestreaming base Caoxians Youai Cloud Warehouse clothing warehouse hanfu threads intricately embroidered garments revival
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Small market but big potential:How sewing threads are weaving the future of automotive interiors and outdoor gear 认领 引用
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作者 Zhong Mengxia 《China Textile》 2025年第4期22-23,共2页
As the global textile market continues to expand, demand for sewing threads-a critical auxiliary material-is rising. In recent years, automotive interiors, smart outdoor equipment, and medical and ecofriendly products... As the global textile market continues to expand, demand for sewing threads-a critical auxiliary material-is rising. In recent years, automotive interiors, smart outdoor equipment, and medical and ecofriendly products have emerged as new growth engines for the textile industry. This has propelled specialized niche markets for sewing threads designed for these applications, revealing significant and undeniable potential. 展开更多
关键词 interiorssmart outdoor equipmentand automotive interiors smart outdoor equipment sewing threads eco friendly products textile industry medical products
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Development of gas-tight threads based on API round threads and its evaluation 认领 引用
17
作者 Zhang Yongqiang Liu Li +4 位作者 Lu Jinfu Yin Zhifu Wang Ke Liu Jie Ta Chuan 《Natural Gas Industry B》 2017年第6期463-469,共7页
Great economic benefit will be made if a kind of low-cost gas-tight thread can be developed on the basis of API round thread with a relatively lowest cost to replace the existing premium thread.In this paper,a kind of... Great economic benefit will be made if a kind of low-cost gas-tight thread can be developed on the basis of API round thread with a relatively lowest cost to replace the existing premium thread.In this paper,a kind of gas-tight threads was designed and manufactured based on the round threads according to the API Spec 5B standard.An elastic sealing ring was added in the middle of the collar,and gas tightness was realized by virtue of the interference matching between the elastic sealing ring and the casing thread.Then,its ultimate bearing capacity was analyzed by using the finite element analysis software MSC.Marc/Mentat.Finally,ISO 13679Bseries andCseries tests,and tension tests under internal gas pressure in the bending setting were carried out onØ73.02×5.51 mm J55 gas-tight threads according to the ISO 13679 standard.It is shown that the gas sealing performance of this gas-tight thread is good,and the results of ultimate internal pressure cycling and the thermal cycling test on sealing pipe ends meet the requirements of ISO 13679.Besides,its internal pressure strength,tensile strength and collapse strength are much higher than those required by GB/T 20657 standard.It is concluded that this type of gas-tight threads can be used in the development of low-pressure gas wells in the Ordos Basin.It has the potential to cut down the casing cost greatly and it can be used as the reference for the design of new gas-tight threads. 展开更多
关键词 Casing Round thread Gas-tight thread Finite element analysis Full-scale test Low-pressure gas field Ordos Basin
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Complications Following Facial Thread-Lifting 认领 引用
18
作者 Zehao NIU Yudi HAN +7 位作者 Rui JIN Yan LI Jianchao LIU Nan LI Wanheng LI Dan LI Youbai CHEN Yan HAN 《Chinese Journal of Plastic and Reconstructive Surgery》 2020年第4期204-211,共8页
Background Facial thread-lifting(FTL)is a minimally invasive facial rejuvenation technique.However,to date,no study has focused on the treatment of complications associated with FTL.The purpose of this study was to re... Background Facial thread-lifting(FTL)is a minimally invasive facial rejuvenation technique.However,to date,no study has focused on the treatment of complications associated with FTL.The purpose of this study was to report on clinical manifestations of complications following FTL and their treatment methods.Methods We retrospectively reviewed the electronic medical records of patients who presented with complications of FTL.Patient demographics,medical history,types and clinical manifestations of complications,imaging,treatment methods,histopathological findings,and follow-up information were collected.Descriptive statistical analysis was performed.Results Our sample included 61 patients,all women,with a mean age of 36.3±8.9 years.The most common reason for consultation was infection(31.2%),followed by dissatisfaction with postoperative facial contour(23%),paresthesia(19.7%),dimpling and irregularity(16.4%),subcutaneous induration(13.1%),thread extrusion(4.9%),and facial nerve injury(3.3%).Fifty-one(83.6%)patients reported alleviated symptoms after receiving pharmaceutical and physical therapies.Surgical interventions,including debridement and thread removal,were required in 10 patients(16.4%).Threads were completely or partially removed in 5 patients within 3 months of the initial FTL.During a median follow-up of 1.7 years,9 patients recovered well and were satisfied with the clinical outcomes,whereas one patient was unsatisfied due to dimpling and scarring.Conclusions The results show that most complications after FTL can be treated nonsurgically.Revision surgery is recommended for patients with recurrent infection,thread extrusion,and subcutaneous induration.Aesthetic surgeons and dermatologists should comply with the indications for FTL and optimize surgical procedures to minimize the risk of complications. 展开更多
关键词 Complication Debridement Facial thread-lifting Infection Thread removal
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Three-dimensional Finite Element Analysis of the Mechanical Properties of Helical Thread Connection 认领 引用 被引量：22
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作者 YANG Guoqing HONG Jun +3 位作者 ZHU Linbo LI Baotong XIONG Meihua WANG Fei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第3期564-572,共9页
Conventional analytical and numerical methods for the mechanical properties of helical threads are relied on many assumptions and approximations and thus hardly yield satisfied results. A parameterized 3D finite eleme... Conventional analytical and numerical methods for the mechanical properties of helical threads are relied on many assumptions and approximations and thus hardly yield satisfied results. A parameterized 3D finite element model of bolted joints with real helical thread geometry is established and meshed with refined hexahedral elements. The Von Mises plasticity criterion, kinematic hardening rule of materials and interfacial contacts are employed to make it possible for the suggested model be able to approach real assembly conditions. Then, the mechanical properties of bolted joints with different thread pitches, thread numbers and modular ratios are investigated, including the contact pressure distribution at joint interfaces, the axial load distribution and stress concentration in screw threads during the loading and unloading process. Simulation results indicate that the load distribution in screw threads produced by the suggested model agrees well the results from CHEN’s photoelastic tests. In addition, an interesting phenomenon is found that tightening the bolt with a large preload first and then adjusting the clamping force by unloading can make the load distribution more uniform and reduce the maximum residual equivalent stress in thread roots by up to 40%. This research provides a simple and practical approach to constructing the 3D finite element model and predicting the mechanical properties of helical thread connection. 展开更多
关键词 finite element analysis thread connection load distribution stress concentration
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Growth of threaded AlN whiskers by a physical vapor transport method 认领 引用 被引量：5
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作者 王军 赵萌 +1 位作者 左思斌 王文军 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期138-142,共5页
Threaded aluminum nitride （A1N） whiskers are grown by a physical vapor transport method in a radio-frequency induction heating furnace. The resultant whiskers are characterized by X-ray diffraction, Raman scattering... Threaded aluminum nitride （A1N） whiskers are grown by a physical vapor transport method in a radio-frequency induction heating furnace. The resultant whiskers are characterized by X-ray diffraction, Raman scattering, scanning electron microscopy, transmission electron microscopy and photoluminescence. The analysis shows that the whiskers are single-crystalline, wurtzite AIN. The threaded A1N whiskers are 0.5 μm^100 μm in diameter and several millimeters in length in the fiber direction, and have lots of tiny sawteeth on the surface. The morphology of this threaded A1N whisker is beneficial for bonding when the whisker is used in composite. The growth of the whiskers is dominated by the vapor-solid （VS） mechanism, and the particular morphology might result from an oscillating condition produced in the radio-frequency induction heating furnace. 展开更多
关键词 A1N whisker threaded morphology physical vapor transport
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