检索结果-南通市图书馆

Biomedical Engineering Communications 2024年第1期3卷 31-37页

作者： yan-chen wang Xiao-yan Guo Yao-Fei Sun Li-Hui Guan Yuan Gao Zhe Meng cheng-Liang Yin Tong-Bin Gao Department of Urology Weifang People's HospitalWeifang 261000China Faculty of Medicine Macao University of Science and TechnologyMacao 999078China

The surgical removal of renal cancer,along with the thrombectomy of the inferior vena cava tumour thrombus,represents a remarkable milestone in urological *** procedure is not only technically demanding but also requires a high level of surgical *** renal cancer combined with a vena cava tumour thrombus poses significant challenges,especially when dealing with combined grade Ⅱ-Ⅳ inferior vena cava tumour *** complexity of these cases is further exacerbated by the delicate anatomical structures involved and the need to preserve critical vessels while effectively removing the *** Upper Urethral Tumour Treatment Centre of Weifang People's Hospital successfully treated a challenging case of left renal tumour combined with grade II inferior vena cava tumour *** surgical team,led by experienced urological surgeons,meticulously planned and executed the procedure,ensuring minimal trauma to the patient and complete removal of the *** achievement not only demonstrates the hospital's commitment to providing state-of-the-art surgical care but also highlights the importance of continued research and training in urological *** successful outcome of this case is a testament to the expertise and dedication of the medical team and offers hope to patients facing similar complex surgical challenges.

关键词： renal carcinoma vena cava tumour thrombus renal artery embolism transoesophageal echocardiography three-dimensional reconstruction techniques

A new sesterterpenoid from the fruits of Phellodendron chinense *** Schneid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第8期19卷 937-939页

作者： chen yan Ye wang Xiao Jiang Hao The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences Guiyang 550002 China

A new sesterterpenoid phellogine was isolated from the fruits of Phellodendron chinense var. glabriusculum Schneid. Its structure was elucidated on the basis of spectral analysis.

关键词： Phellodendron chinense var. glabriusculum Schneid. Phellogine

Irreformable hyponatremia： a case report of pituitary dysfunction with liver cirrhosis

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第14期124卷 2234-2236页

作者： ZHONG Jing chen yan wang Liang-jing Department of Gastroenterology Second Affiliated HospitalZhejiang University School of Medicine Hangzhou Zhejiang310009 China

The diagnosis of pituitary dysfunction is very difficult in inpatients with liver cirrhosis, because the symptoms are intricate and similar. We here report a case of a male patient complaining of fatigue and anorexia for more than two years. On duration of hospital stay, hyponatremia was irreformable. Magnetic resonance imaging of the pituitary revealed the presence of cystic pituitary and abnormal signal in the left frontal lobe. The patient was also suspected to be infective endocarditis. Recognition of this unusual complication of this condition is important for the patients with chronic liver disease.

关键词： pituitary diseases liver cirrhosis hyponatremia endocarditis

Effects of lower fluence pulsed dye laser irradiation on production of collagen and the mRNA expression of collagen relative gene in cultured fibroblasts in vitro

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2006年第18期119卷 1543-1547页

作者： YU Hai-yan chen Da-fang wang Qi chenG Hao Department of Dermatology Sir Run Run Shaw Hospital of Zhejiang University Hangzhou 310016 China

Background Lower fluence of 585-nm flashlamp-pumped pulsed dye laser has been successfully used as a nonablative technique in the treatment of wrinkles. The objective of this study was to evaluate the effect of the pulsed dye laser （585 nm） on the production of collagen and the mRNA expression of collagen related gene in fibroblasts in vitro. Methods Cultured fibroblasts were treated with a 585-nm flashlamp-pumped pulsed dye laser （ fluence 3 J/cm^2, 4 J/cm^2, spot size 7 mm, pulse duration 450 12s）. The production of collagen and the mRNA expression of transforming growth factor （TGF）-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen α1, α2 in fibroblasts were investigated by colorimetry or real time polymerase chain reaction. Results The production of collagen was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. The mRNA expression of TGF- β1, SMAD2, SMAD3, SMAD4, SMAD7 and procollagen I was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. No significant difference of mRNA expression of SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen was found between controls and fibroblasts treated with pulsed dye laser with a fluence of 4 J/cm^2 （P 〉0.05）. Conclusions Lower fluence （3 J/cm^2） pulsed dye laser increased the collagen production in fibroblasts by up-regulating TGF-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen mRNA expression. These may be the reason it can be effectively used in the treatment of wrinkles.

关键词： pulsed dye laser fibroblasts procollagen SMADs

Estimation of Turnover and Equilibrium of Soil Organic Matter Using a Mathematical Approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2006年第5期16卷 634-645页

作者： WU Chun-yan chen Yi wang Jia-Yu wang Sheng-Jia Institute of Environmental Resources ＆ Soil Fertilizer Zhejiang Academy of Agricultural Sciences Hangzhou 310021（China）

The methods based on N uptake of aerial-plants, soil organic matter (SOM) dynamics, Jenny's equation, and actual measurement of long-term field experiments in Jiaxing, Quzhou, Huangyan and Hangzhou of Zhejiang Province, China were used to determine the organic mineralization rate being helpful in estimating the organic requirement for SOM equilibrium. The results showed that the estimated mineralization ratios of SOM for Jiaxing and Quzhou were, respectively, 0.0404 and 0.0508 based on N uptake of aerial-plants in non-fertilized plots; 0.0405 and 0.012 using SOM dynamics in non-fertilized plots; and 0.0413 and 0.0513 using the actual investigated data and Jenny's equation. With Jenny's equation, soil organic C balance in manure + N-P-K plots was estimated at nearly 28.8 g kg-1 for Jiaxing and 32.4 g kg-1 for Quzhou with predicted SOM linearly related to the actual investigated values (r2 = 0.9640 for Jiaxing and 0.8541 for Quzhou). To maintain the SOM balance in the non-fertilized plots the recommended rate of organic materials was 3 000-6 600 kg ha-1, and the relevant rates of farm yard manure (FYM) in the manure and N-P-K plots were estimated at 3 375 (dry) and 17670 kg ha-1 (wet) for Jiaxing, 1845 (dry) and 6090 kg ha-1 (wet) for Quzhou.

关键词： equilibrium mathematic modeling rice fields soil organic matter (SOM) turnover

Evaluation of visual quality of spherical and aspherical intraocular lenses by Optical Quality Analysis System

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2017年第6期10卷 914-918页

作者： yan chen Xue wang Chuan-Di Zhou Qiang Wu Department of Ophthalmology Shanghai Jiao Tong University Affiliated First People＇s Hospital Shanghai 200080 China

AIM： To evaluate the impact of spherical and aspherical intraocular lenses on the postoperative visual quality of age-related cataract patients using Optical Quality Analysis System （OQAS）. METHODS： Seventy-four eyes with age-related cataracts were randomly divided into spherical and aspherical lens implantation groups. Best-corrected visual acuity （BCVA） was measured preoperatively, one day, one week, two weeks, one month and two months after surgery. A biometric systems analysis using the OQAS objective scattering index （OSI） was performed. RESULTS： There were no significant differences in visual acuity （P〉0.05） before and after spherical and aspheric lens implantation. There was a negative linear correction between the OSI value and BCVA （t-=-0.634, P=-0.000）, and positive corrections between the OSI value and the lens LOCUS III value of nucleus color （NC）, nucleus opacity （NO）, cortex （C） and posterior lens capsular （P）（r=0.704, P=0.000; r=0.514, P=0.000; r=0.276, P=0.020; r=0.417, P=-0.000, respectively）. OSI values of spherical vs aspherical lenses were 11.5±3.6 vs 11.8±3.4, 4.1±0.9 vs 3.3±0.8, 3.5±0.9 vs 2.7±0.7, 3.3±0.8 vs 2.6±0.7, 3.2±0.7 vs 2.5±0.8, and 3.2±0.8 vs 2.50.8 before and ld, 1, 2wk, 1 and 2mo after surgery, respectively. All time points varied significantly （P〈0.01） between the two groups. CONCLUSION： Aspherical IOLs does not significantly affect visual acuity compared with spherical IOLs. The OSI value, was significantly lower in the aspherical lens group compared with the spherical lens. This study shows that objective visual quality of aspheric IOLs is better than that of the spherical lens by means of OQAS biological measurement method.

关键词： optical quality analysis system age-relatedcataract spherical lens aspherical lens objective scatteringindex

Colloidal Dispersion of Nano-Ru/SiO_2 in PEG and its Application for Hydrogenation of Benzene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第10期17卷 1413-1416页

作者： Yu Chuan yanG yan chen yan Hua wang Jing yang JIANG Zi Lin JIN State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012

Colloidal dispersion of nano-Ru/SiO2 in PEG （polyethylene glycol, M.W.=400） was used for benzene hydrogenation. The system has the features of easy catalyst＇s recycling and high catalyst stability.

关键词： Ru nanoparticles PEG benzene hydrogenation nano-Ru/SiO2

Product quality prediction based on RBF optimized by firefly algorithm

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 105-117页

作者： HAN Huihui wang Jian chen Sen yan Manting College of Electronics and Information Engineering Tongji UniversityShanghai 201804China

With the development of information technology,a large number of product quality data in the entire manufacturing process is accumulated,but it is not explored and used *** traditional product quality prediction models have many disadvantages,such as high complexity and low *** overcome the above problems,we propose an optimized data equalization method to pre-process dataset and design a simple but effective product quality prediction model:radial basis function model optimized by the firefly algorithm with Levy flight mechanism(RBFFALM).First,the new data equalization method is introduced to pre-process the dataset,which reduces the dimension of the data,removes redundant features,and improves the data *** the RBFFALFM is used to predict product *** expe riments conducted on real-world product quality datasets validate that the new model RBFFALFM combining with the new data pre-processing method outperforms other previous me thods on predicting product quality.

关键词： product quality prediction data pre-processing radial basis function swarm intelligence optimization algorithm

Lanthanum Prevents Salt Stress-induced Programmed Cell Death in Rice Root Tip Cells by Controlling Early Induction Events

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第7期49卷 1024-1031页

作者： Jian-You Li Ai-Liang Jiang Hai-yan chen Ying wang Wei Zhang Department of Biochemistry and Molecular Biology College of Life Science Nanjing Agricultural University Nanjing 210095 China

In a previous study, a salt stress-induced programmed cell death （PCD） model was established in rice root tip cells. Here, by using Wuyunjing 8th rice seedlings, the effects of lanthanum on salt stress-induced PCD early events were studied. The results indicated that low concentrations （10 μmol/L）, but not high concentrations （100 μmol/L） of LaCl3 could effectively prevent salt stress-induced PCD. Further study demonstrated that in the early stages of salt-induced PCD process, 10 μmol/L of La^3＋ could prevent the increase of cytoplasmic calcium levels, inhibit reactive oxygen species （ROS） production, and enhance the ROS-scavenging enzyme activities such as superoxide dismutases （SOD） and ascorbate peroxidase （APX）. Imidazole （20 mmol/L）, the inhibitor of nicotinamide adenine dinucleotide phosphate-oxidase （NADPH oxidase）, could alleviate the occurrence of PCD obviously, and such alleviation could be enhanced by the addition of La^3＋, indicating the involvement of NADPH oxidase in the salt stress-induced PCD process. Taken together, lanthanum could prevent salt stress-induced PCD occurrence in the rice root tip cells by blocking the calcium influx under stress, which was followed by inhibiting calcium-dependent NADPH oxidase activity to prevent O2^·- production and, enhancing the cytosolic antioxidative enzyme activities to scavenge the reactive oxygen species.

关键词： Ca^2+ Oryza sativa programmed cell death reactive oxygen species salt stress.

Underdetermined direction of arrival estimation with nonuniform linear motion sampling based on a small unmanned aerial vehicle platform

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 352-363页

作者： Xinwei wang Xiaopeng yan Tai An Qile chen Dingkun Huang Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China

Uniform linear array(ULA)radars are widely used in the collision-avoidance radar systems of small unmanned aerial vehicles(UAVs).In practice,a ULA's multi-target direction of arrival(DOA)estimation performance suffers from significant performance degradation owing to the limited number of physical *** improve the underdetermined DOA estimation performance of a ULA radar mounted on a small UAV platform,we propose a nonuniform linear motion sampling underdetermined DOA estimation *** the motion of the UAV platform,the echo signal is sampled at different ***,according to the concept of difference co-array,a virtual ULA with multiple array elements and a large aperture is synthesized to increase the degrees of freedom(DOFs).Through position analysis of the original and motion arrays,we propose a nonuniform linear motion sampling method based on ULA for determining the optimal *** the condition of no increase in the aperture of the physical array,the proposed method obtains a high DOF with fewer sampling runs and greatly improves the underdetermined DOA estimation performance of *** results of numerical simulations conducted herein verify the superior performance of the proposed method.

关键词： Unmanned aerial vehicle(UAV) Uniform linear array(ULA) Direction of arrival(DOA) Difference co-array Nonuniform linear motion sampling method