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Search Results: 1 - 10 of 22929 matches for " Wangjun Yuan "
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Study on the Genetic Diversity of Osmanthus fragrans Cultivars

Yuanji Han,Meifang Dong,Wangjun Yuan,Fude Shang,

植物学报 , 2008,
Abstract: We used morphological features and amplified fragment-length polymorphism (AFLP) markers to analyze the genetic diversity of 45 Osmanthus fragrans cultivars and found high levels of genetic diversity among the cultivars. Of the AFLP bands detected, 57.46% are polymorphic. We classified the cultivars biometrically according to their major morphological features and performed cluster analysis of the AFLP data by the unweighted pair-group method using arithmetic averages. The results of both approaches showed that O. fragrans cultivars of the Guilin region form a distinct subgroup, and flower color is aviable classification criterion. We discuss systems for O. fragrans cultivar classification.
Experimental Study on Coherence Time of a Light Field with Single Photon Counting

LI Yuan,ZHANG Yu-Chi,ZHANG Peng-Fei,GUO Yan-Qiang,LI Gang,WANGJun-Min,ZHANG Tian-Cai,

中国物理快报 , 2009,
Abstract: The second-order degree of coherence of pseudo-thermal light and coherence time are experimentally studied via the Hanbruy-Brown-Twiss (HBT) scheme. The system consists of two non-photon-number-resolving single-photon-counting modules (SPCMs) operating in the Geiger mode. We investigate the coherence time of the incident beam for different spot sizes on a ground glass and speeds of a rotating ground glass. The corresponding coherence time can be obtained from Gaussian fitting for the measured second-order degree of coherence. The results show that the coherence time of measured pseudo-thermal light depends on the spot sizes and the rotating speeds of the ground glass. The maximum value of the second-order degree of coherence is reduced as the rotating speed decreases. This result can be well explained by the model of mixed thermal and coherent fields with different ratios.
The Effect of Cerebral Microvascular Endothelial Cells Conditioned Medium on Cultured Neurons

Chen Huicong,Li pengtao,Pan Yanshu,Hua Qian,Du Huan,Wangjun,Liu yuan,

世界科学技术-中医药现代化 , 2008,
Abstract: 目的:探讨体外模拟脑缺血再灌注损伤条件下及通络救脑注射液干预下脑微血管内皮细胞条件培养液(CMEX-CM)对体外正常培养神经元的影响.方法:先分别进行大鼠大脑微血管内皮细胞和神经元的分离纯化培养及建立体外模拟脑缺血再灌注损伤模型,然后用收集的CMECs~CM 1:1和1:5的浓度作用于体外培养的神经元,MTT法测定神经元的活性、存活率,western~blot检测NF-KB的表达.结果:脑微血管内皮细胞条件培养液可影响神经元生存活性,应用中药通络救脑注射液作用于脑微血管内皮细胞后收集的条件培养液可明显提高神经元的生存活性,可以提高神经元中NF-KB的表达.
棉花学报 , 2008,
Non-Negativity Preserving Numerical Algorithms for Problems in Mathematical Finance  [PDF]
Yuan Yuan
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.93024
We give a study result to analyze a rather different, semi-analytical numerical algorithms based on splitting-step methods with their applications to mathematical finance. As certain subsistent numerical schemes may fail due to producing negative values for financial variables which require non-negativity preserving. These algorithms which we are analyzing preserve not only the non-negativity, but also the character of boundaries (natural, reflecting, absorbing, etc.). The derivatives of the CIR process and the Heston model are being extensively studied. Beyond plain vanilla European options, we creatively apply our splitting-step methods to a path-dependent option valuation. We compare our algorithms to a class of numerical schemes based on Euler discretization which are prevalent currently. The comparisons are given with respect to both accuracy and computational time for the European call option under the CIR model whereas with respect to convergence rate for the path-dependent option under the CIR model and the European call option under the Heston model.
Seminal vesicle metastasis after partial hepatectomy for hepatocellular carcinoma
Li Gong, Minwen Zheng, Yanhong Li, Wendong Zhang, Wangjun Bu, Lifang Shi, Wei Zhang, Hong Yan
BMC Cancer , 2011, DOI: 10.1186/1471-2407-11-111
Abstract: A 46-year-old Chinese man was admitted to our hospital due to abdominal distension. He had a history of HCC related to hepatitis B virus infection. Moreover, left partial hepatectomy was performed in another hospital 28 months ago, and right partial hepatectomy for HCC recurrence in our hospital 4 months ago. After resection, radiofrequency ablation therapy had been performed. About 27 months after the initial operation, contrast-enhanced computed tomography (CT) of the pelvic cavity revealed a mass with homogeneous enhancement in the seminal vesicle. Transrectal needle biopsy revealed a poorly differentiated adenocarcinoma. Therefore, seminal vesiculectomy was resected. The histological diagnosis of the removed tumor was compatible with the original HCC. Immunohistochemical examination demonstrated that the tumor cells were positive for glypican-3 (GPC3), alpha-fetoprotein (AFP), hepatocyte paraffin-1 (Hep Par 1), cytokeratin 18 (CK 18), and hepatocyte antigen, which confirmed that the seminal vesicle tumor was a metastatic tumor of HCC. However, CT subsequently revealed multiple metastatic foci in the abdominal and pelvic cavities in May 2009 and August 2009, respectively.The seminal vesicle is an extremely rare metastatic site for HCC, and the prognosis is very poor. A combination of clinical and pathological features is necessary for a correct diagnosis, and primary tumor should be excluded before diagnosing metastatic foci.Hepatocellular carcinoma (HCC) is one of the most common malignancies worldwide, accounting for nearly one million new cases each year [1]. The long-term prognosis for HCC remains poor, with a 5-year survival rate of < 5% [2], and intrahepatic and extrahepatic metastasis are the most important factors. The liver is the most common site of HCC metastasis, accounting for approximately 85% to 90% of all cases [3]. Extrahepatic metastases have been reported to occur in 13.5% to 42% of HCC patients [4-6]. The most frequent sites of extrahepatic me
Single group study to evaluate the feasibility and complications of radiofrequency ablation and usefulness of post treatment position emission tomography in lung tumours
Shijun Kang, Rongcheng Luo, Wangjun Liao, Hubing Wu, Xuelin Zhang, Yuru Meng
World Journal of Surgical Oncology , 2004, DOI: 10.1186/1477-7819-2-30
Abstract: Between November 1999 and May 2002, 50 patients with primary or metastasis pulmonary tumors underwent RFA procedure. The electrode was guided to the target areas using computerized tomography (CT). Tumors smaller than 3.5 cm were given single RFA, while tumors larger than 3.5 cm received RFA to multiple sites. Maximum 4 lesions or 6 target areas were treated during one operating procedure. Whole body and/or lung PET images were acquired; identical site CT images and chest X-ray were taken 1 week before and after RFA.Of the 50 patients, 17 had single lesions while rest had multiple lesions. Tumors smaller than 3.5 cm were completely dissipated after RFA. In tumors larger than 3.5 cm, the part within 3.5 cm diameter dissipated. While CT showed that tumor image became larger 1 to 2 weeks after RFA procedure. PET demonstrated tumor destruction in 70% cases, compared to 38% in CT.The present study shows RFA to be safe and effective treatment option for lung tumors. PET is superior to CT in evaluation the effectiveness of RFA treatment shortly after the procedure.Lung cancer continues to be the leading cause of cancer deaths in United States [1]. The overall prognosis of lung cancer is still dismal despite all current early detection and treatment efforts. Only about 20–25% of lung cancers can potentially be cured by surgery. The majority of patients presents with locally advanced or metastatic disease, and treatments essentially rely on external beam irradiation, chemotherapy or a combination of both [2]. Thus other interventional palliative treatment options have been developed for these lesions.Radiofrequency ablation (RFA), is an imaging-guided percutaneous ablative procedure, that has been suggested to be an effective treatment option for patients with non-small cell lung cancer (NSCLC) and metastatic disease who are not suitable candidates for surgery [3,4]. Guided by computed tomography (CT), physicians are able to localize the tumor and determine the optimal appro
Formation of in-volume nanogratings with sub-100 nm periods in glass by femtosecond laser irradiation
Yang Liao,Wangjun Pan,Yun Cui,Lingling Qiao,Yves Bellouard,Koji Sugioka,Ya Cheng
Physics , 2015,
Abstract: We present direct experimental observation of the morphological evolution during the formation of nanogratings with sub-100-nm periods with the increasing number of pulses. Theoretical simulation shows that the constructive interference of the scattering light from original nanoplanes will create an intensity maximum located between the two adjacent nanoplanes, resulting in shortening of the nanograting period by half. The proposed mechanism enables explaining the formation of nanogratings with periods beyond that predicted by the nanoplasmonic model.
棉花学报 , 2008,
棉花学报 , 2008,
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