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Search Results: 1 - 10 of 68932 matches for " NIU Yu-lan "
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Research on the Development Modes and Approaches of Leisure Agriculture in Wenchuan Post-Earthquake Construction
Yu-Lan Deng,Mei Li
Agricultural Journal , 2013, DOI: 10.3923/aj.2013.71.74
Abstract: This study expounds the background, achievements and advantages of developing leisure agriculture of the post-earthquake construction in Wenchuan, epicenter of the 2008 earthquake. Then the main development modes of leisure agriculture are summarized, namely; sightseeing farm, ethnic folk customs type, ecological landscape type, earthquake memorial type. At last, 5 successful approaches of developing leisure agriculture in Wenchuan are concluded.
Nomenclatural correction
15卷第1期“土沙苑”学名订正

Li Yu-Lan,
李玉兰

中国科学院研究生院学报 , 1981,
Abstract:
New Taxa of Boraginaceae from China
中国紫草科新分类群

Liu Yu-Lan,
刘玉兰

中国科学院研究生院学报 , 1984,
Abstract:
Two types of the cloud system over the Tibetan plateau in spring as seen on the satellite pictures
从卫星云图上看到的春季高原上两类云系

Li Yu-Lan,
李玉兰

大气科学 , 1977,
Abstract: 根据1971—1976年卫星云图,我们发现春季西藏高原上涡旋云系、横向云带出现的机会很多,这些云系一般有一定的流场相配合。本文对这两类云系的特征进行初步概括。由于篇幅所限,每一类类型只给1—2张云图,其他图略。 春季高原上的涡旋云系 春季西藏高原上的低涡云系出现机会较多。有人曾经将高原上的低涡云系在卫星云图上的表现分为五种:即涡旋状云系、近于圆状的云区、半环状云区、长条形云系、逗点云
Palonological Records on Deep-Sea Sediments at Core 69 in the South China Sea and Climatic Changes
南海深海69站柱状沉积中的孢粉记录与气候变化

ZHANG Yu-lan,
张玉兰

热带海洋学报 , 2009,
Abstract: 通过对南海69站深海柱状剖面的孢粉、藻类研究,根据孢粉成分的变化将该孔沉积层从下至上划分为5个孢粉组合带:1带:Quercus(常绿)-Pinus-Cyathea-Artemisia孢粉带(552.5—470cm);2带:Pinus-PP0dofnrpus—Quercus—Polypodiaceae孢粉带(470--350cm);3带:Quercus(常绿)-Castanopsis—Pinus—Polypodiaceae孢粉带(350250cm);4带:Pinus,Podocarpus-Artemisia-Polypodiaceae孢粉带(250140cm);5带:P0docarpus-cyathea-Quercus(常绿)-Pinus-Polypodiaceae孢粉带(140-0cm)。并相应恢复了南海东部64000a以来3个植被、气候、古环境演替阶段:热带季雨林、热带北缘半常绿季雨林和热带季雨林。结合氧同位素测定资料,对69站柱状地层时代作了划分:孢粉1带相当于氧同位素3期,时代为Q3^3-2;孢粉2-4带相当于氧同位素2期,时代为Q3^3-3;孢粉5带为氧同位素1期,时代为Q4.
从卫星云图上看到的春季高原上两类云系
李玉兰 Li Yu-Lan
大气科学 , 1977, DOI: 10.3878/j.issn.1006-9895.1977.01.09
Abstract:
Comparison of Aerosol Single Scattering Albedo Derived from the Ozone Monitoring Instrument with Aerosol Robotic Network Observations
LIU Qi,HONG Yu-Lan,
LIU Qi
,HONG Yu-Lan

大气和海洋科学快报 , 2012,
Abstract: The single-scattering albedo (SSA), which quantifies radiative absorption capability, is an important optical property of aerosols. Ground-based methods have been extensively exploited to determine aerosol SSA but there were no satellite-based SSA measurements available until the advent of advanced remote sensing techniques, such as the Ozone Monitoring Instrument (OMI). Although the overall accuracy of OMI SSA is estimated to approach 0.1, its regional availability is unclear. Four-year SSA daily measurements from three Aerosol Robotic Network (AERONET) sites in China (Xianghe, Taihu, and Hong Kong) are chosen to determine the accuracy of OMI SSA in specific locations. The results show that on a global scale, the OMI SSA is systematically higher (with a mean relative bias of 3.5% and a RMS difference of ~0.06) and has poor correlation with the AERONET observations. In the Xianghe, Taihu, and Hong Kong sites, the correlation coefficients are 0.16, 0.47, and 0.44, respectively, suggesting that the distinct qualities of OMI SSA depend on geographic locations and/or dominant aerosol environments. The two types of SSA data yield the best agreement in Taihu and the worst in Hong Kong; the differing behavior is likely caused by varying levels of cloud contamination. The good consistency of the aerosol variation between the two SSA datasets on a seasonal scale is promising. These findings suggest that the current-version OMI SSA product can be applied to qualitatively characterize climatological variations of aerosol properties despite its limited accuracy as an instantaneous measurement.
金属线电极分形生长的模拟
Simulation of Fractal Growth?on Metal Wire Electrode

丁莉峰,毛沛元,程军,牛宇岚,文宇浩,程玮
DING Li-feng
, MAO Pei-yuan, CHENG Jun, NIU Yu-lan, WEN Yu-hao, CHEN Wei

- , 2018, DOI: 10.13208/j.electrochem.170711
Abstract: 摘要 电沉积金属过程中,阴极沉积的金属边缘会出现包括枝晶生长在内的许多复杂形态,这会严重影响电沉积产品的质量和加工过程中的电流效率. 对枝晶分形生长的过程以及形貌进行研究,可以实现对沉淀物的可控生长. 本研究使用Python和Matlab软件相互结合,基于扩散限制凝聚(DLA)模型,建立平行线电极电沉积的模型. 通过分析不同粒子数、沉积概率、电极间距、运动步长、定向漂移条件下的分形生长的变化规律,以及模拟参数与实际电沉积因素对分形生长影响的内在联系,发现只要合理控制模拟的粒子数、沉积概率、线电极间距、运动步长、定向漂移概率参数即可与实际电化学体系的浓度和沉积时间、还原概率、两极间距、温度和电压、电极的相对位置和形状一一对应,从而模拟得到跟实际电沉积接近的分形图,最终可实现对分形生长的可控操作,对分形生长在工业电沉积等方面应用有很大的意义.
During processes of metal electrodepostion, there exist many complex morphological forms such as dendritic growing in the cathode deposited metal edge, which will seriously affect the quality of the electrodeposited product and current efficiency during machining. Investigations on dendritic crystal growing process and morphology could help controlling growth of electrolysis precipitate. In this work, Python and Matlab softwares were used, and the model of parallel electrode electrodeposition was established based on the diffusion-limited aggregation (DLA) model. By analyzing the law of fractal growth at different conditions of the particles number, probability, electrode spacing, the movement step length and orientation drift, and the inner link between simulation parameters and practical factors that affect fractal growth of electrodeposition, it was found that the simulation results can match the actual parameters by controlling the simulation parameters such as particles number, wire electrode spacing, movement step length and orientation drift probability. The inner connection between simulated parameters and actual electrodeposition factors is discussed. Finally, the specific electrodeposition experiments can be simulated by changing the computer variables, which is controllable and crucial to applying the fractal growth to industry electrolysis
Value of ultrasound examination in differential diagnosis of pancreatic lymphoma and pancreatic cancer
Li Qiu, Yan Luo, Yu-Lan Peng
World Journal of Gastroenterology , 2008,
Abstract: AIM: To investigate the value of clinical manifestations and ultrasound examination in the differential diagnosis of pancreatic lymphoma and pancreatic cancer.METHODS: The clinical and ultrasonic characteristics of 12 cases of pancreatic lymphoma and 30 cases of pancreatic cancer were retrospectively analyzed.RESULTS: Statistically significant differences were found in the course of disease, back pain, jaundice, carcino-embryonic antigen (CEA) and CA19-9 increase, palpable abdominal lump, superficial lymph node enlargement, fever and night sweats, lesion size, bile duct expansion, pancreatic duct expansion, vascular involvement, retroperitoneal (below the renal vein level) lymph node enlargement, and intrahepatic metastasis between pancreatic lymphoma and pancreatic cancer. There were no significant differences in age of onset, gender ratio, weight loss, nausea and vomiting, lesion position, the echo of the lesion, and the blood flow of the lesion.CONCLUSION: Pancreatic lymphoma should be considered for patients with long lasting symptoms, superficial lymph node enlargement, palpable abdominal lump, fever and night sweats, relatively large lesions, and retroperitoneal (below the level of the renal vein) lymph node enlargement. A diagnosis of pancreatic cancer should be considered more likely in the patients with relatively short disease course, jaundice, back pain, CEA and CA19-9 increase, relatively small lesions, bile duct expansion, obvious pancreatic duct expansion, peripheral vascular wrapping and involvement, or intrahepatic metastases.
Taohe Chengqi Tang ameliorates acute liver injury induced by carbon tetrachloride in rats
Tung-yuan LAI,Yu-lan YEH
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To clarify the efficacy of Taohe Chengqi Tang (THCQT), a compound traditional Chinese herbal medicine, in protecting liver damage induced by carbon tetrachloride (CCl4) in rats. Methods: Thirty male Wistar rats were divided into normal control group, untreated group, low-dose THCQT group (receiving 0.3 g/kg of THCQT), high-dose THCQT group (receiving 0.5 g/kg of THCQT), and positive control group (receiving silymarin 25 mg/kg). All testing substances were orally administered 1 hour before the intraperitoneal injection of CCl4 (1.5 mL/kg). Twenty-four hours after CCl4 injection, the rats were sacrificed to observe liver histopathological changes, and to evaluate activities of serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT), and lipid peroxidation (LPO) and glutathione (GSH) levels in liver tissues. Results: CCl4 injection elevated the serum AST and ALT activities, but THCQT significantly reversed this effect. The increase of hepatic LPO by CCl4 was markedly reduced by THCQT. Also, this herbal mixture increased hepatic GSH in the rats. In histopathology analysis, THCQT decreased the fatty accumulation, necrosis and lymphocyte infiltration. The in vitro study in rat brain showed that LPO induced by Fe2+/ascorbic acid was dose-dependently reduced by THCQT. According to the biochemical and morphological data, THCQT could protect the liver from CCl4-induced injuries.Conclusion: THCQT seems helpful for protection of liver damage induced by chemicals depending on its anti-oxidant-like function, and THCQT is more effective than silymarin.
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