检索结果-南通市图书馆

基于CBCT的双尖牙区即刻种植和位点保存延期种植效果的临床研究

在线全文

学校读者我要写书评

暂无评论

海南医学 2024年第3期35卷 349-353页

作者：牛方吴宁闫玉娟朱娟芳郑州大学第一附属医院口腔科河南郑州450000

目的探讨口腔锥形束CT(CBCT)动态监测双尖牙区即刻种植和位点保存延期种植对牙槽骨高度、宽度、周围骨密度影响,以期为临床制定后续干预方案提供参考。方法前瞻性选取2020年4月至2022年4月于郑州大学第一附属医院口腔科就诊的62例双尖... 详细信息

目的探讨口腔锥形束CT(CBCT)动态监测双尖牙区即刻种植和位点保存延期种植对牙槽骨高度、宽度、周围骨密度影响,以期为临床制定后续干预方案提供参考。方法前瞻性选取2020年4月至2022年4月于郑州大学第一附属医院口腔科就诊的62例双尖牙区需拔除并行种植修复患者作为研究对象,按随机数表法分为即刻种植组和位点保存延期种植组各31例,两组患者均于种植治疗前、种植体植入6个月后行CBCT扫描,比较两组患者的牙槽骨高度丧失量(H值)、宽度丧失量(W值)、周围骨密度(T值)、红色美学指数(PES)评分和炎性因子[C反应蛋白(CRP)、肿瘤坏死因子-α(TNF-α)]水平,并比较两组患者的主观满意度和并发症发生情况。结果位点保存延期种植组植入6个月后牙槽骨H值、W值分别为(1.62±0.28)mm、(0.36±0.09)mm,高于即刻种植组的(0.79±0.17)mm、(0.14±0.05)mm,T值为(135.27±7.54)HU,低于即刻种植组的(188.35±9.36)HU,差异均有统计学意义(P0.05)。结论口腔CBCT可用于评估即刻种植和延期种植对双尖牙区牙槽骨高度、宽度、周围骨密度的影响,即刻种植可提高口腔美观度,改善炎症状态,且安全性良好。

关键词：口腔锥形束CT 双尖牙区即刻种植延期种植牙槽骨高度周围骨密度

在线全文

学校读者我要写书评

暂无评论

磷钒矿发电灰渣空白焙烧工艺及动力学研究

稀有金属与硬质合金 2024年第2期52卷 6-10页

作者：郭拴全牛芳银康敏郭梅宁新霞邢相栋西安西北有色地质研究院有限公司陕西西安710054 陕西省矿产资源综合利用工程技术研究中心陕西西安710054 西安建筑科技大学冶金工程学院陕西西安710054

以磷钒矿发电灰渣为原料,对其空白焙烧工艺及动力学进行了研究。结果表明:灰渣中钒主要以钒云母形式存在,而且主要呈V^(3+)价态;灰渣空白焙烧适宜的工艺参数为:焙烧前将灰渣磨矿至细度为-0.074 mm占90%,在880~900℃温度下焙烧16 h, V_(2... 详细信息

以磷钒矿发电灰渣为原料,对其空白焙烧工艺及动力学进行了研究。结果表明:灰渣中钒主要以钒云母形式存在,而且主要呈V^(3+)价态;灰渣空白焙烧适宜的工艺参数为:焙烧前将灰渣磨矿至细度为-0.074 mm占90%,在880~900℃温度下焙烧16 h, V_(2)O_5浸出率可达71%左右;灰渣空白焙烧反应由界面化学反应控制,表观反应活化能为89.75 kJ/mol,动力学方程为1-(1-x)^(1/3 )=114.47exp[-89 750/(RT)]t。

关键词：磷钒矿发电灰渣空白焙烧钒浸出表观反应活化能动力学方程

Performance quality counts more in moderating economic growth On the development of China's textile industry during the 12th FiveYear Program period by Wang Tiankai,President of CNTAC

在线全文

学校读者我要写书评

暂无评论

China Textile 2016年第1期 10-13页

作者： Gao Huabin niu fang Zhao Zihan

During the 12th Five-Year Program period,China’s textile industry presented various new features in its development.Entering the"New Normal",the industry development witnessed a moderated speed shift from high to medium.Especially,China’s total export value of textile and apparel showed a negative growth in 2015,which has been the third time following the Asian fi-

关键词： apparel witnessed counts adjustment technological upgrading textiles garment beginning companies

Chemical fibers:To "decelerate" the development in the next five years Interview with Duan Xiaoping,President of China Chemical FibersAssociation

在线全文

学校读者我要写书评

暂无评论

China Textile 2015年第11期 46-47页

作者： niu fang Zhao Zihan

"China’s chemical fiber industry has witnessed remarkable achievements based on the development of the 12th Five-Year Program,which can be briefly described into such three points:the first is the gradually established global leading position in conventional fiber production field;the second is large-scale manufacturing of high-performance fibers that have sharply narrowed the gap between China and the developed

关键词： decelerate Chemical fibers

Save plastic trash disaster:recycling fiber faces shuffle of the industry

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Textile 2017年第10期 32-33页

作者： niu fang Shen Da

In recent years,with the concept of green development and the basic national policy of conserving resources and protecting the environment,China speeds up the construction of a resource-saving and environment-friendly society,and forms a new pattern of harmonious development of man and nature.In many tasks of textile industry,it's undoubtedly a

关键词： In Co Save plastic trash disaster:recycling fiber faces shuffle of the industry

Effectiveness of entomopathogenic fungal strains against poplar/willow weevil(Cryptorhynchus lapathi L.)larvae

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第5期33卷 1691-1702页

作者： fang niu Ya Xing Niya Jia Kai Ding Dan Xie Huanwen Chen Defu Chi Key Laboratory for Sustainable Forest Ecosyst Management of Ministry of Education College of ForestryNortheast Forestry UniversityHarbin 150040HeilongjiangPeople’s Republic of China

The poplar and willow weevil,Crypto rhynchus lapathi L.,a major universally destructive wood-boring insect has become one of the important quarantine pests that is extremely destructive to forestry development and needs to be controlled.Entomopathogenic fungi(EPF) are considered safe and friendly for humans and the environment and play important roles in controlling insect pest populations.In this study,the screening of entomopathogenic fungi for control of C.lapathi is reported through the evaluation of virulence of four fungal Beauveria bassiana(CFCC81428,CFCC83116,CFCC83486,CFCC87297)strains,one B.brongniartii(CFCC83487) strain and one Metarhizium anisopliae(CFCC88953) strain.The virulence of the different strains was appraised by correct mortality rate,cumulative mortality rate,median lethal concentration(LC_(50)) and median lethal time(LT_(50)).B.bassiana strains CFCC81428 and CFCC83116 were the most virulent among the six strains with a mortality up to 100%,and the LT_(50) were 2.7 and 3.1 days.Five conidia concentrations of three strains(CFCC81428,CFCC83116 and CFCC87298) that caused high virulence was screened for dose-relationship.Their effect on controlling C.lapathi larvae were also determined under field condition by brushing conidia suspensions on C.lapathi larvae infested in a poplar trunk.The cumulative rate in the field was lower than those obtained from the laboratory,but the order of the virulence of different strains did not change.Mortality in all three strains occurred at their highest concentration(1.0 × 10^(8) conidia mL^(-1)).Under field conditions,the CFCC81428 strain was the most effective,causing mortalities of 80.3% and 75.2%in two plots in Beipiao and Lindian counties,respectively,followed by CFCC83116(69.1%,66.6%) and CFCC87298(60.7%,59.3%).Based on our results,the B.bassiana strain CFCC81428 has the potential as a biological insecticide to control C.lapathi larvae.

关键词： Entomopathogenic fungi Pathogenicity Biocontrol control Beauveria bassiana Cryptorhynchus lapathi

Cotton textile:trudge through deep Interview with the Vice President of China Cotton Textile Association,Ye Jianchun

在线全文

学校读者我要写书评

暂无评论

China Textile 2015年第11期 42-43页

作者： niu fang Y.C.

Q:In 2015,is'twelfth live-year'ending battle,both in economic environment and industrial small environment are facing especially difficult circumstances,to date,what about the overall operation of textile machinery in... 详细信息

关键词：纺织机械行业经济环境发展趋势性能特点

结构阻尼比对超高层建筑顺风向风振响应的影响

在线全文

学校读者我要写书评

暂无评论

建材世界 2024年第1期45卷 97-100页

作者：郭小飞袁哲峰王瑞牛方义中国建筑科学研究院有限公司北京100013 建研院检测中心有限公司北京100013

以某超高层建筑结构为工程研究背景,主要研究了阻尼比对风振响应(基底剪力、楼层位移、加速度)的影响,结果表明:阻尼比较大时,其对结构顺风向的风振响应影响较小;随着阻尼比的增加,风振响应(基底剪力、楼层位移)最大值减小幅度较大,而... 详细信息

以某超高层建筑结构为工程研究背景,主要研究了阻尼比对风振响应(基底剪力、楼层位移、加速度)的影响,结果表明:阻尼比较大时,其对结构顺风向的风振响应影响较小;随着阻尼比的增加,风振响应(基底剪力、楼层位移)最大值减小幅度较大,而均方根值和平均值减小幅度较小,几乎无太大变化;随着阻尼比的增加,顶层加速度最大值、最小值和均方根值变化量比较大,而平均值几乎无变化。

关键词：风振系数阻尼比超高层建筑风振响应

在线全文

学校读者我要写书评

暂无评论

新疆库山河洪水过程模拟分析

中国农村水利水电 2024年第2期 23-30页

作者：曹彪白云岗王新涛卢震林余其鹰牛芳鹏新疆水利水电科学研究院新疆乌鲁木齐830049 郑州大学水利科学与工程学院河南郑州450001

全球气候变暖背景下极端洪水灾害频发,对地处干旱、半干旱地区的新疆影响尤为明显,洪水灾害风险增大。为了提高干旱区洪水灾害应对能力,针对新疆典型流域库山河构建了洪水分析计算模型,确定模型关键参数和边界条件,经场次洪水验证,水深... 详细信息

全球气候变暖背景下极端洪水灾害频发,对地处干旱、半干旱地区的新疆影响尤为明显,洪水灾害风险增大。为了提高干旱区洪水灾害应对能力,针对新疆典型流域库山河构建了洪水分析计算模型,确定模型关键参数和边界条件,经场次洪水验证,水深平均绝对误差为24.1 cm,相对误差为24%,决定系数为0.66;流量纳什系数为0.86,决定系数达到0.97,模型具有较高的计算精度。利用高精度河道地形,洪水灾害风险普查结果、遥感信息等资料建立流域数据底板,计算了不同频率下洪水行进过程、淹没范围、水深分布以及淹没历时等情景,实现了大尺度、全流域干旱区河流的洪水演进模拟,研究成果可以为干旱内陆区河流洪水风险分析提供技术依据。

关键词：干旱区库山河洪水数值模拟情景分析