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| 1 | Regional eco-efficiency evaluation and spatial pattern analysis of the Yangtze River Economic Zone显示文摘The environmental ecology of the Yangtze River Economic Zone(YREZ)faces ecological function decline,deterioration and degradation under intense human activities,long-term development and utilization and its economy has developed rapidly over recent decades.Eco-efficiency is considered as a measure of coordinated development of economy,resources,environment and ecology,and is currently considered a very important issue.In this paper,based on the slack-based measure and data envelope analysis model,we take 129 prefecture-level cities of the YREZ as the study unit and measure the eco-efficiency of the YREZ in 2000,2005,2010 and 2015,which considers undesired output.The evaluation of the status quo of the regional eco-efficiency development was carried out at provincial,prefectural and city scales.The spatial autocorrelation test model and standard deviation ellipse were used to analyze the spatially distributed characteristics and the evolutionary regularity of eco-efficiency.Our study suggested that the eco-efficiency value varied significantly at different spatiotemporal scales and the overall distribution presented an'N-shaped'pattern,the value is the largest downstream and the smallest upstream.Regional eco-efficiency presented certain volatility in growth and a clear spatial positive agglomeration trend from 2000 to 2015.The spatial distribution of each agglomeration area was also significantly different,forming some high-high agglomeration areas at the center of the shaft with Shanghai and surrounding cities,and some low-low agglomeration areas at the center with middle reaches and upstream cities.The low-high over-aggregation and high-low polarization clusters were fewer.At the same time,with the change of the research period,the degree of positive agglomeration became increasingly pronounced and the eco-efficiency gap of the neighborhoodunit reduced.The regional eco-efficiency value of the YREZ presented a spatial distribution pattern in the northeast-southwest axis and the evolutionary pattern of the regional eco-efficiency similarly showed a northeast-southwest orientation. | HA Lin TU Jianjun YANG Jianping XU Chunhai PANG Jiaxing LU Debin YAO Zuolin ZHAO Wenyu | 2020 | Journal of Geographical Sciences2020，30，7： | 8 |
| 2 | Upconversion luminescence of Gd2O3:Er3+and Gd2O3:Er3+/silica nanophosphors fabricated by EDTA combustion method显示文摘Gd2O3:Er^3+nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid(EDTA-Na2)as fuel at not high temperature(≤350℃)within a very short time of 5 min.The added concentration of Er^3+ions in Gd2O3 matrix was changed from 0.5 mol%to 5.0 mol%.The X-ray diffraction pattern of samples indicates the monoclinic structure of Gd2O3:Er^3+.The morphology and chemical composition analysis of the Gd2O3:Er^3+samples are characterized by a field emission scanning electron microscope(FESEM)and a Fourier-transform infrared spectrometer(FTIR).The photoluminescence(PL),photo luminescence excitation(PLE)and upconversion(UC)at room temperature of the prepared materials with different concentrations of Er^3+were investigated.The PL of Gd2O3:Er^3+nanomaterials are shown in visible at 545,594,623,648,688 nm under excitation at 275 nm.The emission bands from transitions of Er^3+from 2P3/2 to 4F9/2 are observed,UC luminescent spectra of the Gd2O3:Er^3+/silica nanocomposites under 976 nm excitation show the bands at 548 and 670 nm.The influence of excitation power at 980 nm for transitions were measured and calculated.The results indicate that the upconversion process of Gd2O3:Er^3+/silica is two photons absorption mechanism.The low temperature dependence of UC luminescent intensities of the main bands of Gd2O3:Er^3+was investigated towards development of a nanotemperature sensor in the range of 10-300 K. | Le Quoc Minh Tran Kim Anh Nguyen Duy Hung Pham Thi Minh Chau Nguyen Thi Quy Hai Ho Van Tuyen Vu Thi Thai Ha Vu Duc Tu Wieslaw Strek | 2019 | Journal of Rare Earths2019，37，11： | 2 |
| 3 | Virological surveillance of dengue haemor- rhagic fever in Viet Nam, 1987- 1999 显示文摘 | Ha DQ Ninh TU | 2000 | Dengue Bulletin2000，24，： | 1 |
| 4 | Comparison of Sensory Characteristics of Green Tea Produced in Thai Nguyen and Phu Tho Province, Vietnam显示文摘 | Dang Thi Minh Luyen Ha Duyen Tu Philippe Lebailly Nguyen Duy Thinh Tu Viet Phu | 2014 | Journal of Food Science and Engineering2014，4，2： | 1 |
| 5 | Results of a retrospective data- base analysis of drug utilization and costs for treatment of chronic hepati- tis B virus infection in the northern Netherlands between 2000 and 2006 显示文摘 | Tu HA Bos JH Woerdenbag HI | 2010 | ClinTher2010，32，1： | 1 |
| 6 | Mullerian inhibiting substance inhibits breast cancer cell growth through an NFkappa B-mediated pathway显示文摘 | Segev DL Ha TU Tran TT | 2000 | J Biol Chem2000，257，28： | 1 |
| 7 | Mullerian inhibiting substance inhibits breast cancer cell growth through an NF kappa B-mediated pathway显示文摘 | Segev DL Ha TU Tran TT | 2000 | J Biol Chem2000，275，28： | 1 |
| 8 | Effect of supersaturation of Cu on reaction and intermetallic compound formation between Sn - Cu solder and thin film metallization显示文摘 | Ha J S Oh T S Tu K N | 2003 | Journal of Materi- als Research2003，18，9： | 1 |
| 9 | Mullerian inhibiting substance inhibits ovarian cell growth through an Rb-independent mechanism显示文摘 | Ha TU Segev DL Barbie D | 2000 | J Biol Chem2000，275，37： | 1 |
| 10 | Regional variations in trace element concentrations in tissues of black tiger shrimp Penaeus monodon (Deeapoda: Penaeidae)from-South Vietnam显示文摘 | Tu N P C Ha N N Ikemoto T | 2008 | Marine Pollution Bulletin2008，57，612： | 1 |
| 11 | Immunologic reconstruction after antiretroviral treatment 显示文摘 | Tu biana R Carcelain G Mohand HA | 1999 | Presse Med1999，28，42： | 1 |
| 12 | Biochemical characterization of thelizard toxin gilatoxin 显示文摘 | Hendon HA Tu AT | 1981 | Biochemistry1981，20，12： | 1 |
| 13 | 加强设计管理不断提高工程设计水平显示文摘吐哈油田成立几年来,设计管理工作取得长足进步。组建管理机构,为实施设计管理提供了组织保证;规范和完善设计市场,建立健全了一系列相应的管理办法和规章制度,使设计管理工作做到有章可循;严格资质审查,引入竞争机制,推行设计招投标制;做好前期工作,为项目科学决策提供技术支持;加强初步设计审查,向优化设计要效益;细化施工图审查,有效地控制工程造价;广泛采用新技术,形成既有国内外一流水平,又简单、适度、实用,具有吐哈特色的自控系统。 | Tu Ha Headquarters | 1998 | 石油规划设计1998，9，3： | 0 |
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