检索结果-南通市图书馆

High-gravity-assisted green synthesis of rare-earth doped calcium molybdate colloidal nanophosphors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第6期28卷 1744-1751页

作者： Yuan Pu lifeng lin Jun Liu Jiexin Wang Dan Wang State Key Laboratory of Organic Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

In this work,we report an innovative route for the synthesis of rare-earth doped calcium molybdate(CaMoO4)nanophosphors by using high gravity rotating packed bed(RPB)technology and paraffin liquid as the *** significant intensified mass transfer and micromixing of reactants in the RPB reactor are benefiting for homogeneous doping of rare-earth ions in the host materials,leading to nanophosphors with high quantum *** use of liquid paraffin as the solvent eliminates the safety risks associated with volatile organic compounds,increasing the potential for clean production of *** excitation of deep ultraviolet(DUV)light,the CaMoO4:Na+,Eu3+nanophosphors exhibit red emission at peak wavelength of 615 nm and quantum yield of up to 35.01%.The CaMoO4:Na+,Tb3+nanophosphors exhibit green emission at peak wavelength of543 nm with quantum yield of up to 30.66%.The morphologies of the nanophosphors are tunable from nanofibers through nanorods to nanodots and the possible mechanism of controlling the formation of different nanostructures is proposed on the basis of experimental results and theoretical analysis of *** nanophosphors are highly dispersible in organic solvents and utilized for fabricating fabrication of flexible,freestanding luminescent films based on silicone *** also demonstrate the red LEDs consisting of the hybrid films of CaMoO4:Na+,Eu3+nanoparticles as color-converting phosphors and DUV LEDs as illuminators,offering strong potential for future nanophosphors-basedsolid-state lighting systems.

关键词： Colloidal nanophosphors CaMoO4 Process intensification High gravity technology Green solvent

海南自贸港(区)建设背景下加快推进知识产权保护与应用体系建设的思考

在线全文

学校读者我要写书评

暂无评论

多段AAO污水处理厂精确曝气系统设计与调试

中国科技纵横 2024年第9期 17-19页

作者：林立峰袁晓军周雄中国热带农业科学院海南海口 571101

知识产权是促进科技创新与经济发展的杠杆,也是保护劳动成果不受侵害、形成投入产出良性循环的载体.基于此,本文探讨了在海南自贸港(区)建设背景下,知识产权发展面临的机遇和存在的问题,并提出了相应的建议,以期通过政府、科研院校、企... 详细信息

知识产权是促进科技创新与经济发展的杠杆,也是保护劳动成果不受侵害、形成投入产出良性循环的载体.基于此,本文探讨了在海南自贸港(区)建设背景下,知识产权发展面临的机遇和存在的问题,并提出了相应的建议,以期通过政府、科研院校、企业等各方努力为海南省知识产权高质量发展增添动力.

关键词：海南自贸港(区) 知识产权保护

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

城市道桥与防洪 2024年第1期 153-156,M0013,M0014页

作者：应基光林莉峰汪芸芸上海市政工程设计研究总院(集团)有限公司上海市200092

为了能够更好地解决污水处理过程中经常遇到的曝气不足、出水氨氮超标,曝气过量反硝化不好导致的总氮超标、能耗浪费等问题,以深圳市某污水处理厂多段AAO处理工艺为研究对象,介绍了在生化池中引入精确曝气系统的设计和调试情况,并结合... 详细信息

为了能够更好地解决污水处理过程中经常遇到的曝气不足、出水氨氮超标,曝气过量反硝化不好导致的总氮超标、能耗浪费等问题,以深圳市某污水处理厂多段AAO处理工艺为研究对象,介绍了在生化池中引入精确曝气系统的设计和调试情况,并结合实际运行情况对精确曝气控制系统的效用进行了分析和总结。

关键词：多段AAO 精确曝气系统溶解氧自动控制

Density field measurement and approximate reconstruction of supersonic mixing layer

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第19期55卷 2004-2009页

作者： ZHAO YuXin YI ShiHe TIAN lifeng HE lin CHENG ZhongYu College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China

The density field measurement of supersonic mixing layer based on the nanoparticle-based planar laser scattering method was *** calibration of experimental images was analyzed,and the relation between tracer particles concentration and local density of flowfield was calibrated with oblique shockwave *** to the characteristic of mixing layer images,the influence of uneven light intensity distribution was *** these calibration methods,the density field of supersonic mixing layer with convective Mach number at 0.12 was *** analyzing the spanwise vortical structures and streamwise density field,the three dimensional(3D) density field was approximately reconstructed,which apparently reflected the 3D structure of supersonic mixing layer.

关键词：超音速混合层密度场测量超声速图像校准实验校准三维结构激光散射法

Cancer incidence and mortality in Guangdong province,2012

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2016年第3期28卷 311-320页

作者： Ruilin Meng Kuangrong Wei Liang Xia Yanjun Xu Wanqing Chen Rongshou Zheng lifeng lin Institute of Control and Prevention for Chronic Non-infective Disease Guangdong Provincial Center for Disease Control and Prevention Institute of Cancer Zhongshan People's Hospital Cancer Hospital Chinese Academy of Medical SciencesPeking Union Medical College & National Cancer Center

Objective： To estimate the cancer incidence and mortality in 2012 in Guangdong province by analyzing the cancer data of selected population-based cancer registries in Guangdong province in 2012. Methods： Eight of nine population-based cancer registries submitted cancer data to the Guangdong Provincial Centre for Disease Control and Prevention （Guangdong CDC）, whose data met the data quality criteria were included for analysis. The statistics of selected registries, stratified by areas, gender, age and cancer types, were used to estimate the cancer incidence and mortality in 2012 in Guangdong province according to the population data in Guangdong province. Segi＇s population and the national census population in 2000 were used for calculating the age-standardized rates （ASR）. Results： A total of 15,084,942 people, accounted for 17.47% of all population in Guangdong province, were covered in 8 selected population-based cancer registries in 2012. The percentage of cases morphologically verified （MV%） and the percentage of death certificate-only cases （DCO%） were 72.84% and 0.87%, respectively, and the mortality/incidence （M/I） ratio was 0.56. It was estimated that there were 211,300 new cancer cases and 117,300 cancer deaths. The incidence crude rate （CR）, the ASR by Chinese standard population （ASRC） and by world standard population （ASRW）, and the accumulated rate （AR）（0-74 years） were 250.20/100,000 （265.39/100,000 in males, 234.29/100,000 in females）, 207.04/100,000, 201.34/100,000 and 22.91%, respectively, in Guangdong province in 2012. The incidence CR and ASRC were 267.25/100,000 and 221.43/100,000 in urban areas, and 215.51/100,000 and 178.77/100,000 in rural areas, respectively. The death CR, ASRC, ASRW and AR （0-74 years） were 148.44/100,000 （190.95/100,000 in males, 105.06/100,000 in females）, 103.73/100,000, 102.44/100,000 and 11.68%, respectively, in Guangdong province in 2012. The death CR and ASRC were 164.57/100,000 and 105.46/100,000 in urban areas, an

关键词： Cancer registration malignancy incidence mortality Guangdong province

Incidence and mortality of primary bone cancers in China, 2014

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2019年第1期31卷 135-143页

作者： Liang Xia Rongshou Zheng Yanjun Xu Xiaojun Xu Siwei Zhang Hongmei Zeng lifeng lin Wanqing Chen Institute of Non-communicable Disease Control and Prevention Guangdong Provincial Center for Disease Control and Prevention National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Science and Peking Union Medical College

Objective: In this study, we aimed to estimate the updated incidence and mortality of primary bone cancers based on population-based cancer registration data in 2014, collected by the National Central Cancer Registry of China(NCCRC).Methods: In 2017, 339 registries' data were qualified based on data quality criteria set down by the *** of primary bone cancers were retrieved from the national database. We estimated numbers of primary bone cancer cases and deaths in China using age-specific rates and corresponding national population stratified by area,sex, age-group(0, 1-4, 5-9, 10-14, …, 85+). Chinese standard population in 2000 and Segi's World population were applied for the calculation of age-standardized incidence and mortality ***: In 2014, 24,000 primary bone cancer cases and 17,200 deaths attributable to primary bone cancers were estimated to have occurred in China. The crude incidence rate of primary bone cancers was 1.76/100,000, with agestandardized incidence rate by Chinese standard population(ASIRC) and by World standard population(ASIRW)being 1.35/100,000 and 1.32/100,000, respectively. The crude mortality rate of primary bone cancers was1.26/100,000, with age-standardized mortality rate by Chinese standard population(ASMRC) and by World standard population(ASMRW) being 0.88/100,000 and 0.86/100,000, respectively. Age-specific incidence curve was bimodally distributed with age, with the first peak occurring in the second decade of the life and the second peak in the elderly. Males had higher crude and age-standardized rates for both incidence and mortality compared with females. Both crude and age-standardized incidence rates were higher in rural areas than in urban areas, so were the crude and age-standardized mortality ***: This population-based study presents the most recently available estimates on primary bone cancers in China, revealing that the males are 1.34 times as much as females suffering from primary bone can

关键词： Incidence mortality population-based primary bone cancers

2017年广东省肿瘤登记地区女性乳腺癌流行特征及2013—2017年变化趋势

在线全文

学校读者我要写书评

暂无评论

中国肿瘤 2024年第1期33卷 62-67页

作者：李爱娟欧孟言许燕君王晔孟瑞琳陈丹琪刘旻坤林立丰廖羽广东省疾病预防控制中心广东广州511430 广东药科大学公共卫生学院广东广州510315 中山大学公共卫生学院广东广州510080

[目的]分析2017年广东省女性乳腺癌的流行状况及2013—2017年期间广东省女性乳腺癌的变化趋势。[方法]利用广东省2013—2017年肿瘤登记地区乳腺癌发病和死亡数据,根据城乡和年龄组分层计算女性乳腺癌粗发病(死亡)率、中标率、世标率、35... 详细信息

[目的]分析2017年广东省女性乳腺癌的流行状况及2013—2017年期间广东省女性乳腺癌的变化趋势。[方法]利用广东省2013—2017年肿瘤登记地区乳腺癌发病和死亡数据,根据城乡和年龄组分层计算女性乳腺癌粗发病(死亡)率、中标率、世标率、35~64岁截缩率、0~74岁累积率等指标,并采用Joinpoint模型分析其变化趋势。[结果]2017年广东省肿瘤登记地区女性乳腺癌粗发病率为51.32/10万,中标发病率为39.82/10万,世标发病率为37.14/10万,35~64岁截缩发病率为94.38/10万,0~74岁累积发病率为3.98%。城市和农村地区的女性乳腺癌中标发病率分别为43.18/10万和31.45/10万。同期,广东省肿瘤登记地区女性乳腺癌粗死亡率为10.27/10万,中标死亡率为7.37/10万,世标死亡率为7.17/10万,35~64岁截缩死亡率为16.00/10万,0~74岁累积死亡率为0.81%。城市和农村地区的女性乳腺癌中标死亡率分别为7.52/10万和6.98/10万。2017年女性乳腺癌发病在60~64岁组达到顶峰,死亡在85岁及以上组达最高峰。2013—2017年期间,广东省肿瘤登记地区女性乳腺癌发病率和死亡率变化趋势均无统计学意义(发病率:APC=0.70%,P=0.38;死亡率:APC=1.71%,P=0.44)。[结论]2017年广东省肿瘤登记地区女性乳腺癌发病率、死亡率均高于全国平均水平,并一直保持较高的水平,防控形势仍然很严峻,城市地区的发病率和死亡率均明显高于农村地区。应重点关注城市地区、中老年女性群体的乳腺癌三级预防,降低其发病率及死亡率。

关键词：女性乳腺癌流行情况广东

The application of NB-Io T technology in Internet of things

在线全文

学校读者我要写书评

暂无评论

中国新通信 2018年第3期20卷 136-137页

作者： lin lifeng Jiao Bingli R&D Center Hai Hua Electronics Enterprise(China) Co. Ltd. School of Electronics Engineering and Computer Science Peking University

NB-IoT Networking(Narrow Band-Internet of Things), has the characteristics of low power consumption, low cost, wide coverage, positioning in the operator level, based on the spectrum of low rate networking market;have broad application prospects in position tracking, environmental monitoring, intelligent parking, remote meter reading, and agriculture animal husbandry and other fields. In this paper, the current mainstream technology: GPRS, 3G/4G, NB-IoT, LoRa technical analysis and comparison, the final details of the NB-Io T technology in the context of the use of Internet of things and market value.

关键词： NB-IoT low cost Internet of things

An experimental study of aero-optical aberration and dithering of supersonic mixing layer via BOS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第1期53卷 81-94页

作者： ZHAO YuXin , YI ShiHe, TIAN lifeng, HE lin & CHENG ZhongYu College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China National University of Defense Technology College of Aerospace and Material Engineering Changsha China (GRID:grid.412110.7) (ISNI:***)

The optical performance of supersonic mixing layer is heavily deteriorated by the aero-optical aberration and dithering of coherent structures, but current measuring methods limit the spatiotemporal resolution in relevant studies. A high resolution whole-field aero-optical aberration and dithering measuring method based on the Background Orient Schlieren (BOS) technique was studied. The systematic structure, sensitivity and resolution of BOS are analyzed in this paper. The aero-optical aberration and dithering of streamwise structures in supersonic mixing layers were quantificationally studied with BOS. The aberration field of spanwise structures revealed the ribbon-like aberration structures, which heavily restrict the optical performance of a mixing layer. The quantifications of aero-optical aberration and dithering are very important in studying aero-optical performance of supersonic mixing layer.

关键词： aero-optics supersonic mixing layer BOS