attrition相关论文
This paper reviews the theory of language attrition, which refers to the loss or degradation of second language skills d......
Study on attrition of spherical-shaped Mo/HZSM-5 catalyst for methane dehydro-aromatization in a gas
As a potential methane efficient conversion process,non-oxidative aromatization of methane in fluidized bed requires a c......
Production of High-Purity Silica Sand from Ivorian Sedimentary Basin by Attrition without Acid Leach
To produce high-purity silica sand usable for glass making, the present study was carried out. The objective of this wor......
Effects of various parameters on the attrition of bed material in a recirculating fluidized bed with
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目的:通过对上、下颌第一磨牙不同部位生理性磨耗的观察,探讨磨耗特征及其生理意义.方法:551 个上颌第一磨牙和686 个下颌第一磨牙......
This study examined elutriation,attrition,and segregation in a conical spouted bed with a fountain confiner and incorpor......
The Enlightenment of Language Attrition and Forgetting to English Vocabulary Memory Strategies for C
This paper reviews the theory of language attrition,which refers to the loss or degradation of second language skills du......
文章采用汉语词汇测试问卷调查的方式初步探讨了新疆少数民族大学生汉语词汇的磨蚀状况,分析了产生词汇磨蚀的相关因素,为今后的汉......
目的 探讨3种充填材料修复老年人后牙重度磨损的疗效.方法 98例后牙重度磨耗的老年患者(患牙108颗)随机分为3组治疗:A组:玻璃离子水门......
目的:通过对上、下颌第一磨牙不同部位生理性磨耗的观察,探讨磨耗特征及其生理意义。方法:551个上颌第一磨牙和686个下颌第一磨牙,根据发为轻......
目的:调查秦朝时期成人牙齿的磨损状况,以探寻牙齿磨损的规律及其发展趋势.方法:测量并统计了秦始皇帝陵区山任陶窑遗址出土的113......
目的:研究自然磨耗对上颌第一磨牙面外形高点改变的影响和意义。方法:从生活环境相近的人群中选择研究对象,20~28岁组及40~48岁组人......
论述了改性聚四氟乙烯材料的特点以及在水压传动中的应用优势。结合水压元件用材原则和聚四氟乙烯材料的自身磨损特性,合理地选择改......
通过两次测试调查了独立学院非英语专业新生英语水平磨蚀情况。配对样本T检验发现:经过一年英语学习,全体受试对象、部分高分组学生......
以粉煤灰改性钙基吸收剂作为研究对象,考察流化时间、颗粒粒径、煅烧温度、流化风速以及煅烧气氛对其磨损特性的影响,并与石灰石的......
对循环流化床锅炉炉内非金属耐磨耐火材料的防磨结构进行了分析,同时还对CFB锅炉重点部位的磨损及防磨设计注意事项进行了简单的介......
本文针对循环流化床锅炉的防磨技术进行研究,根据其发生磨损的性质和特点的不同,采用不同的防磨措施进行防磨。......
通过对高压叶片泵和柱塞泵摩擦副磨损元件的磨损机理、摩擦副形貌、颜色、失重等诸方面的测试和分析研究,提出了抗磨液压油台架试验......
在催化剂磨损现象和强度的基础上,对浆态相费托合成反应中的铁催化剂的磨损机制进行了描述,侧重对系统雷尼铁催化剂的磨损规律另以研......
本文主要探究了利用共混技术对高分子聚合物进行改性处理,将共混聚合物弹性体适用于高温状况下的冲击,磨砺磨损的物理机械性能。对影......
DENTALOCCLUSIONSTUDYOFYUDEN SSKULLINNEOLITHICAGEXuLin(徐丽丽),SunDelin(孙大麟),PanKefeng(潘可风)(DepartmentofOralAnatomy,SchoolofStoma.........
通过DOE实验设计对沉淀铁费托合成催化剂焙烧过程进行了优化,并给出了焙烧过程的分子模拟与粒子长大模型。结果表明,随着焙烧温度......
介绍了物料状态对磨损机理的影响,详细分析了耐磨金属材料在磨料磨损状态下的磨损机理。通过实践,探讨了各种耐磨金属材料的耐磨性能......
以语言磨蚀为切入点,通过问卷调查研究,统计维吾尔族大学生习得近义词的磨蚀现状,并进行磨蚀归因分析,掌握其磨蚀规律,帮助其准确......
Study on the friction and wear properties of the surface nanocrystallized 1.0C-1.5Cr steel induced b
Nano-structured layers are fabricated on the surface of 1.0C-1.5Cr steel by using the surface mechanical attrition treat......
应用圆盘碾磨器对制得的七种不同形状和尺寸的固体颗粒进行了系统的磨损试验和研究。验证了Gwyn的固体颗粒磨损动力学方程能在较广泛的......
通过实证研究探明非英语专业大学生的产出性英语词汇特征及词汇学习策略与词汇磨蚀的关系,得出以下基本结论:英语词汇的磨蚀程度与......
细焦申科秤主要输送的是散装物料——石油焦粉,生产中易产生漏料、堵料、系统的停运等问题。本文从原因分析入手,提出了轴的缺陷、壳......
结合75t/h循环流化床锅炉的实际运行情况,介绍该锅炉的汽水流程、风烟煤流程、设计参数及运行中存在的问题,分析问题的原因,并提出......
通过对300MW机组锅炉一次风道实际磨损状况的分析,认为煤质改变导致机组运行工况恶劣,空预器出口的一次风带灰严重是热一次风道磨损......
阐述了换热器的类型及工作原理。针对炼油、化工装置中应用广泛的换热器的失效问题,从腐蚀、密封件失效等方面入手,分析了换热器的失......
文章在一套小型固定流化床装置上考察了一种流化催化裂化(FCC)平衡剂在不同温度下随着磨损时间变化的磨损状况,结合Gwyn动力学磨损方......
Predictors of Retention and Passing the National Council Licensure Examination for Registered Nurses
Using Seidman’s retention formula as a theoretical foundation, this study investigated historical data from a Bachelor ......
主要分析了机车磨损,影响了机床的使用寿命,若修理不及时,磨损产生颗粒,还会加剧磨损,而磨损产生沟槽容易藏污垢,也会加剧磨损,严重时能使......
目的:探讨老年牙列重度磨耗伴牙列缺损的重建修复治疗。方法:对75例牙列重度磨耗伴牙列缺损(部分伴有TMD症状)的老年患者采用[牙合]......
针对工业装置运行中的实际问题,在综合热态流化床实验台上研究了不同运行参数下石英砂的磨损规律.实验的设计采用正交实验方法,研......
引言石英砂作为异密度流化床锅炉媒体床料,在特种流化床锅炉与装置中得到应用。但在实际运行过程中,由于磨损而形成大量的细小颗粒并......
振动磨以其高粉碎率和超细度粉碎而著称,同时,也存在着严重的磨损流失现象,这不仅造成了材料的巨大浪费,而且也关系到该机的推广和正常......
The Analysis of the Attrition of College Students in Mobile Assisted Language Learning: A Case Study
Mobile devices are playing indispensable roles in college students’lives and more and more college students adopt MALL ......
This study aims to identify if participants experience attrition in writing skills after two years’ nonuse of English.7......
Studying foreign language attrition is important in the context of Chinese language learning because, in light of a grow......
提出了颗粒停留时间概念,将物料进行粒径和年龄的分档,并通过模型计算出各个粒径档的停留时间分布.推导的停留时间与用床存量除以......
Al-12.5 wt% Si alloy powder with 15 wt% SiCp was mechanically alloyed (MA) using attrition mill in purified nitrogen atm......
Occlusal tooth wear in human sculls of antique period from Vendenis and Municipium Dardanorum DD, Ko
Aim: To describe the presence, frequency of attrition in permanent dentition of human skulls from two ancient archeologi......
Revised national tuberculosis control programme in India has limited co-hort-wise information about what happens to pati......
Magnitude and associated factors of health professionals’ attrition from public health sectors in Ba
Background: Attrition of health professionals from public health sectors is found to be a barrier to effectiveness of he......
Attrition from care after the critical phase of severe pre-eclampsia and eclampsia: Insights from an
Background: Evidence has shown that Magnesium Sulphate (MgSo4) is the gold standard for treating severe pre-eclampsia an......
针对QRB-80/20乳化液泵箱体与滑块接触的滑道孔在生产使用中频繁出现拉伤报废现象,分析乳化液泵的结构特点,提出结构改进措施,经现场使......
抗磨液压油台架试验条件苛刻,造成高压泵摩擦副磨损的因素较为复杂,我国高压泵试验元件的材质、加工及热处理工艺等与进口泵不近相同......