期刊文献+
共找到137篇文章
< 1 2 7 >
每页显示 20 50 100
碳纤维复合材料构件加工缺陷与高效加工对策 被引量:30
1
作者 鲍永杰 高航 《材料工程》 EI CAS CSCD 北大核心 2009年第S2期254-259,共6页
碳纤维复合材料钻削加工时易产生分层、毛刺、撕裂等缺陷,是典型的难加工材料。本文以碳纤维增强/树脂基复合材料为研究对象,观察钻孔缺陷形成过程,建立单丝切削模型分析缺陷形成原因;讨论了轴向力对缺陷的影响规律。结论如下:纤维方向... 碳纤维复合材料钻削加工时易产生分层、毛刺、撕裂等缺陷,是典型的难加工材料。本文以碳纤维增强/树脂基复合材料为研究对象,观察钻孔缺陷形成过程,建立单丝切削模型分析缺陷形成原因;讨论了轴向力对缺陷的影响规律。结论如下:纤维方向对缺陷形成有重要的影响,轴向力增大分层与撕裂缺陷相应增大;以磨代钻加工工艺、新型PCD刀具和螺旋面钻头对于提高碳纤维复合材料钻孔质量都有很大提高。 展开更多
关键词 碳纤维复合材料 钻孔 轴向力 缺陷
下载PDF
电镀金刚石钻头钻削碳纤维复合材料研究 被引量:26
2
作者 鲍永杰 高航 李凤全 《金刚石与磨料磨具工程》 CAS 北大核心 2009年第3期38-42,共5页
碳纤维复合材料钻孔加工时极易产生分层、毛刺、撕裂等缺陷,是典型的难加工材料。针对碳纤维复合材料特点,以电镀金刚石钻头为研究对象,从钻削轴向力、钻孔出口质量等方面分析电镀金刚石钻头钻孔特点,并与硬质合金麻花钻进行对比,得出结... 碳纤维复合材料钻孔加工时极易产生分层、毛刺、撕裂等缺陷,是典型的难加工材料。针对碳纤维复合材料特点,以电镀金刚石钻头为研究对象,从钻削轴向力、钻孔出口质量等方面分析电镀金刚石钻头钻孔特点,并与硬质合金麻花钻进行对比,得出结论:电镀金刚石钻头钻削碳纤维复合材料时钻削轴向力较小,钻削质量较好,更适合于碳纤维复合材料的加工;钻头转速提高有利于减小钻孔缺陷的产生,钻削轴向力随钻头转速的升高而降低,随钻头直径的增大而增大;最后,通过多元线形回归方法得出电镀金刚石钻头钻削力经验公式。 展开更多
关键词 碳纤维复合材料 电镀金刚石钻头 钻削轴向力 缺陷
下载PDF
PVC结构的不稳定缺陷及其稳定化改性 被引量:9
3
作者 郝子明 余灯华 +1 位作者 易志伟 陈金鹏 《塑料助剂》 2004年第3期36-39,41,共5页
介绍了PVC结构的不稳定缺陷及其稳定化改性机理 ,提出了键合理论 ,深化了稀土类热稳定剂稳定机理。综述了各种PVC热稳定剂的特点及其研究现状 ,指出无毒、高效、多功能化是PVC热稳定剂发展的主要方向 ,并简要探讨了实现该方向的研发创... 介绍了PVC结构的不稳定缺陷及其稳定化改性机理 ,提出了键合理论 ,深化了稀土类热稳定剂稳定机理。综述了各种PVC热稳定剂的特点及其研究现状 ,指出无毒、高效、多功能化是PVC热稳定剂发展的主要方向 ,并简要探讨了实现该方向的研发创新方略。 展开更多
关键词 PVC 聚氯乙烯 稀土类热稳定剂 通用树脂 加工成型工艺 金属离子
下载PDF
C/E复合材料“以磨代钻”制孔工艺 被引量:10
4
作者 鲍永杰 高航 +1 位作者 董波 李兰柱 《宇航材料工艺》 CAS CSCD 北大核心 2010年第4期47-49,共3页
为了提高C/E复合材料构件制孔加工质量,以C/E复合材料为研究对象,提出"以磨代钻"制孔新工艺,并研制了电镀金刚石刀具。与传统硬质合金刀具钻孔工艺进行对比试验,结果表明:金刚石刀具钻削轴向力降低30%-50%、刀具耐用度提高3-... 为了提高C/E复合材料构件制孔加工质量,以C/E复合材料为研究对象,提出"以磨代钻"制孔新工艺,并研制了电镀金刚石刀具。与传统硬质合金刀具钻孔工艺进行对比试验,结果表明:金刚石刀具钻削轴向力降低30%-50%、刀具耐用度提高3-5倍、缺陷显著减少,更适合C/E复合材料钻孔加工。 展开更多
关键词 C/E复合材料 “以磨代钻”刀具 钻孔 缺陷 轴向力
下载PDF
Analysis of Process Control Model of Plate MAS Rolling 被引量:4
5
作者 ZHU Fu-wen HU Xian-lei ZHAO Zhong LIU Xiang-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2010年第4期31-33,共3页
Using the identification quantity to identify the long ear disfigurement was brought up, and by calculation, it can be found that identification quantity should be set as the quantity of long ear disfigurement of the ... Using the identification quantity to identify the long ear disfigurement was brought up, and by calculation, it can be found that identification quantity should be set as the quantity of long ear disfigurement of the position which is about 0. 2 times of plate width to the plate border. Conception of plate head tiny cell was brought up, and the long ear disfigurement was uncoupled into the product of elongation percentage and length of tiny cell. On the basis of prediction of long ear disfigurement, process control model of MAS rolling was built up, and application indicates that it can fit the on-line production and eliminate the long ear disfigurement commendably. 展开更多
关键词 PLATE plane shape plan view pattern MAS rolling long ear disfigurement head disfigurement
原文传递
旋压加工缺陷的成因及预防措施研究 被引量:4
6
作者 傅晓炜 《新技术新工艺》 2005年第8期42-43,共2页
本文分析了数控旋压成形加工中薄板的变形特点及所产生的旋压缺陷,并提出了相应 的预防措施。
关键词 旋压 缺陷 成因 预防
下载PDF
浅谈红外测温在发现运行电力设备缺陷方面的应用 被引量:5
7
作者 王晓辉 《河南电力》 2007年第1期18-20,共3页
红外检测技术水平日臻成熟,在电力系统中作为有效、便捷的缺陷检测手段越来越受到各级管理部门的重视,本文通过工作中红外测温发现的一个缺陷实例,阐述了用红外测温发现缺陷时应注意的几个问题。
关键词 红外检测 电力设备 缺陷
原文传递
刍议硕士研究生招生条件中的空洞 被引量:2
8
作者 钟尚科 《现代大学教育》 2003年第2期72-74,共3页
本文从社会上出现的新型“催生考研”应试教育现象 ,透视硕士研究生招生条件中的空洞。通过分析这种畸形教育现象产生的制度原因 。
关键词 研究生 招生条件 应试 畸形教育 空洞
下载PDF
尿素合成塔重大缺陷调查分析与措施 被引量:4
9
作者 吴岩石 张中大 《压力容器》 北大核心 2005年第6期40-45,共6页
吉化公司尿素合成塔运行18年来,塔内衬里及筒体焊缝先后发现点腐蚀、局部较均匀腐蚀、晶间腐蚀、应力腐蚀开裂、鼓包、冲刷腐蚀和焊接缺陷等严重安全隐患,对此进行调查分析,提出解决办法。
关键词 调查 缺陷 分析 措施
下载PDF
钛合金蓝色阳极氧化及缺陷检测研究 被引量:3
10
作者 孙慧艳 周英杰 杨景伟 《涂装与电镀》 2009年第6期3-5,共3页
本项研究主要目的是检查钛合金材料在冶炼、锻造及机械加工过程中产生的缺陷。其主要作用原理是在钛合金表面形成蓝色阳极氧化膜,然后在酸溶液中部分去除,使得钛合金表面缺陷暴露更明显,从而通过缺陷状态来判断钛合金材料表面存在的缺... 本项研究主要目的是检查钛合金材料在冶炼、锻造及机械加工过程中产生的缺陷。其主要作用原理是在钛合金表面形成蓝色阳极氧化膜,然后在酸溶液中部分去除,使得钛合金表面缺陷暴露更明显,从而通过缺陷状态来判断钛合金材料表面存在的缺陷种类。 展开更多
关键词 钛合金 蓝色阳极化 缺陷
下载PDF
阳光控制镀膜玻璃表面缺陷的观察与分析 被引量:2
11
作者 赵洪力 刘起英 +2 位作者 杨静凯 刘艳丽 张福成 《硅酸盐学报》 EI CAS CSCD 北大核心 2009年第11期1899-1902,共4页
采用常压化学气相沉积法在浮法玻璃上制备了阳光控制镀膜玻璃。用扫描电镜和能谱仪对镀膜玻璃表面的缺陷进行了观察,分析了产生缺陷的原因。结果表明:镀膜玻璃样品表面存在典型的孔洞、翘曲和皱褶等缺陷,缺陷的尺寸不超过100μm,孔洞缺... 采用常压化学气相沉积法在浮法玻璃上制备了阳光控制镀膜玻璃。用扫描电镜和能谱仪对镀膜玻璃表面的缺陷进行了观察,分析了产生缺陷的原因。结果表明:镀膜玻璃样品表面存在典型的孔洞、翘曲和皱褶等缺陷,缺陷的尺寸不超过100μm,孔洞缺陷发生在薄膜与基体之间。缺陷的形成与制备工艺条件,如:反应气体的配比、流量、玻璃板的厚度与玻璃基体的化学成分等因素有关。 展开更多
关键词 浮法玻璃 阳光控制镀膜玻璃 缺陷 扫描电镜
原文传递
Mapping out the social experience of cancer patients with facial disfigurement
12
作者 Alessandro Bonanno Jin Young Choi 《Health》 2010年第5期418-428,共11页
This article contributes to the limited literature on the social consequences of cancer generated facial disfigurement by reporting the result of an exploratory analysis of interaction between facially disfigured canc... This article contributes to the limited literature on the social consequences of cancer generated facial disfigurement by reporting the result of an exploratory analysis of interaction between facially disfigured cancer patients and strangers and acquaintances (secondary groups). Secondary groups are those in which membership occurs due to performance of formal and/or non-intimate roles. Interaction is studied as it takes place in different social settings. Indivi- duals who are affected by cancer of the head and neck region can now expect to survive for many years after the cancer is detected and later surgically removed. Because of surgery, these survivors live the rest of their lives with facial disfigurement and are stigmatized and socially excluded. It follows that a new and socially relevant situation has emerged: as medicine develops and allows more patients to survive, it forces them to spend significant portions of their lives dealing with the stigma associated with facial disfigurement. Research on social issues pertaining to facially disfigured cancer patients remains sparse. Limited knowledge has been produced on the “social context” within which interaction between the disfigured and relevant social groups takes place. To date most research has focused on the individual and his/her ability to adapt to the condition of facially disfigured. To address this scientific gap and document the manner through which the interaction process is socially created and evolves, interviews with fourteen facially disfigured cancer patients were carried out. These interviews were designed to reconstruct the interaction experiences of these individuals in different social contexts. Data were analyzed through the qualitative approach of grounded theory. Results indicate that patients can be divided into two groups: Occasionally Comfortable Patients and Always Comfortable Patients. Occasionally comfortable patients are individuals who experience different levels of comfort in interaction. In some situations they do no 展开更多
关键词 FACIAL disfigurement CANCER STIGMA SOCIAL Interaction
下载PDF
The Pectoralis Major Myocutaneous Pedicled Flap Revisited
13
作者 Shinichi Asamura Hirohiko Kakizaki +3 位作者 Kazunori Mori Kazuhide Matsunaga Wada Mitsuhiro Noritaka Isogai 《Surgical Science》 2013年第9期380-384,共5页
The pectoralis major myocutaneous pedicle flap (PMMF) is still being used by many surgeons and plays an important role in head and neck reconstruction. The purpose of this series was to review our 10 years’ experienc... The pectoralis major myocutaneous pedicle flap (PMMF) is still being used by many surgeons and plays an important role in head and neck reconstruction. The purpose of this series was to review our 10 years’ experience with the PMMF in head and neck reconstruction. One hundred and two patients who underwent the PMMF technique were reviewed on the clinical records. Postoperative complications were classified into flap loss, hemorrhage, infection, fistula formation, wound dehiscence and donor site complication. Eighty two patients (80.4%) demonstrated no complication. Six patients among 102 patients (5.9%) demonstrated total or partial skin necroses. Three female patients were completely dissatisfied with the cosmetic appearance after the PMMF. One of them required a reconstructive surgery with the latissimusdorsi flap. Without surgical expertise in plastic surgical field, an ear-nose-throat or an oral surgeon can performed the PMMF technique provided the operator is well aware of serious and frequent complications of this “workhorse” procedure. 展开更多
关键词 Pectoralis MAJOR Myocutaneous Pedicled FLAP Head and NECK Reconstruction FLAP LOSS BREAST disfigurement
下载PDF
大学英语学习中的母语“文化失语”缺陷之考察 被引量:2
14
作者 贾燕 《教育文化论坛》 2014年第6期58-61,共4页
文章通过问卷调查,具体分析了大学生使用英语表达中国文化的实际能力及其影响因素,并采用访谈、追踪调查等方法,进而探寻造成母语"文化失语"缺陷的原因,得出在今后的教学中需注重用英语准确表述母语文化知识能力的培养,帮助... 文章通过问卷调查,具体分析了大学生使用英语表达中国文化的实际能力及其影响因素,并采用访谈、追踪调查等方法,进而探寻造成母语"文化失语"缺陷的原因,得出在今后的教学中需注重用英语准确表述母语文化知识能力的培养,帮助学生克服母语"文化失语",弘扬中华文化。 展开更多
关键词 母语文化失语 缺陷 考察
下载PDF
Q235A槽钢缺陷原因分析 被引量:2
15
作者 杨仁江 杨峥 《物理测试》 CAS 2003年第5期28-29,共2页
对生产中发现的严重裂缝掉块的槽钢进行缺陷分析。结果表明,槽钢缺陷产生的原因与钢坯质量不 良有关。
关键词 槽钢 缺陷分析 钢坯质量 碳钢
下载PDF
气泡釉的研制 被引量:2
16
作者 石小涛 范学运 +1 位作者 余小荔 翁加立 《中国陶瓷》 CAS CSCD 北大核心 2006年第12期47-49,67,共4页
研制了一种从石灰釉中分离出来的缺陷釉—气泡釉。气泡釉由于其特殊的性质,不适用于强度要求高的建陶,一般用于普通的日用瓷或艺术瓷。主要利用长石、高岭土、方解石、白云石和石英等常用原料,通过调整各种原料的用量,改变釉层厚度、烧... 研制了一种从石灰釉中分离出来的缺陷釉—气泡釉。气泡釉由于其特殊的性质,不适用于强度要求高的建陶,一般用于普通的日用瓷或艺术瓷。主要利用长石、高岭土、方解石、白云石和石英等常用原料,通过调整各种原料的用量,改变釉层厚度、烧成制度等方法来寻求最佳的气泡釉效果。 展开更多
关键词 气泡釉 石灰釉 缺陷 气泡
下载PDF
Perceptions and experiences of female burn survivors with facial disfigurement 被引量:2
17
作者 Zainab Habib Rukhsana Saddul Fatima Kamran 《Chinese Journal of Traumatology》 CAS CSCD 2021年第1期53-56,共4页
Purpose This study aimed at exploring the perceptions and experiences of female burn survivors with facial disfigurement in Pakistan.Methods Two different quantitative and qualitative studies were conducted,of which t... Purpose This study aimed at exploring the perceptions and experiences of female burn survivors with facial disfigurement in Pakistan.Methods Two different quantitative and qualitative studies were conducted,of which the data were collected from 100 burn patients.A pilot interview protocol was developed.An indepth interview of five female burn survivors with facial disfigurement was taken in Lahore,Pakistan.The transcripts were analyzed using thematic analysis and four major themes were identified,respectively physical appearance,posttraumatic growth,relationships and coping strategies.Results Thematic analysis reflected differences in attributional style,perceptions and individual experiences of female burn survivors with facial disfigurement.The study showed the importance of physical appearance for different burn survivors and how their life had changed after suffering from a burn injury.Conclusion It could be easy to have a positive outlook towards life and accept visible differences post injury for the burn survivors,who are grateful for life,get a strong family support and have available resources.On the contrary,with low self-esteem,lack of a family support and available resources,patients would be dissatisfied with their life. 展开更多
关键词 Burn injury Facial disfigurement Quality of life Physical appearance COPING
原文传递
Quality Assessment of Attribute Data in GIS Based on Simple Random Sampling 被引量:1
18
作者 LIU Chun SHI Wenzhong LIU Dajie LIU Chun, Ph. D, postdoctoral fellow, Department of Surveying and Geo-informatics, Tongji University, 1239 Siping Road, Shanghai 200092, China. 《Geo-Spatial Information Science》 2003年第2期13-19,共7页
On the basis of the principles of simple random sampling, the statistical model of rate of disfigurement (RD) is put forward and described in detail. According to the definition of simple random sampling for the attri... On the basis of the principles of simple random sampling, the statistical model of rate of disfigurement (RD) is put forward and described in detail. According to the definition of simple random sampling for the attribute data in GIS, the mean and variance of the RD are deduced as the characteristic value of the statistical model in order to explain the feasibility of the accuracy measurement of the attribute data in GIS by using the RD. Moreover, on the basis of the mean and variance of the RD, the quality assessment method for attribute data of vector maps during the data collecting is discussed. The RD spread graph is also drawn to see whether the quality of the attribute data is under control. The RD model can synthetically judge the quality of attribute data, which is different from other measurement coefficients that only discuss accuracy of classification. 展开更多
关键词 quality assessment simple random sampling rate of disfigurement attributedata
下载PDF
浅析高速公路波形梁热镀锌缺陷的成因及解决方法 被引量:1
19
作者 苗万群 《交通科技与经济》 2005年第1期41-42,共2页
分析了高速公路波形梁热镀锌的主要影响因素,如硅、铁对热镀锌的影响,并据此提出了防治措施。
关键词 热镀锌 缺陷 高速公路 波形 解决方法 防治措施
下载PDF
华中Ⅰ型数控车削系统G71与G52指令的联合妙用
20
作者 卢定军 《湖南冶金职业技术学院学报》 2004年第2期185-187,共3页
介绍了,内外径复合固定循环指令G71与局部坐标系设定指令G52的联合使用,来解决G71循环加工过程中,粗加工与精加工不能分开的缺陷问题。
关键词 G71 G52 缺陷 联合使用
下载PDF
上一页 1 2 7 下一页 到第
使用帮助 返回顶部