检索结果-南通市图书馆

Chinese Geographical Science 2024年第1期34卷 106-117页

作者： LIU Kai ZHANG Dapeng chen tan CUI Peipei FAN chenyu SONG Chunqiao Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing210008China University of Chinese Academy of Sciences Nanjing(UCASNJ)Nanjing211135China Geographic Information and Tourism College Chuzhou UniversityChuzhou239000China

As a typical region with high water demand for agricultural production,understanding the spatiotemporal surface water changes in Northeast China is critical for water resources management and sustainable ***,the long-term variation characteristics of surface water of different water body types in Northeast China remain rarely *** study investigated how surface water bodies of different types(e.g.,lake,reservoir,river,coastal aquaculture,marsh wetland,ephemeral water) changed during1999–2020 in Northeast China based on various remote sensing-based *** results showed that surface water in Northeast China grew dramatically in the past two decades,with an equivalent area increasing from 24 394 km^(2) in 1999 to 34 595 km^(2) in *** surge of ephemeral water is the primary driver of surface water expansion,which could ascribe to shifted precipitation *** wetlands,rivers,and reservoirs experienced a similar trend,with an approximate 20% increase at the interdecadal *** contrast,coastal aquacultures and natural lakes remain relatively *** study is expected to provide a more comprehensive investigation of the surface water variability in Northeast China and has important practical significance for the scientific management of different types of surface water.

关键词： surface water spatiotemporal variation water body classification remote sensing Northeast China

Mediating the Migration of Mesenchymal Stem Cells by Dynamically Changing the Density of Cell-selective Peptides Immobilized on β-Cyclodextrin-modified Cell-resisting Polymer Brushes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第9期38卷 126-136,I0005页

作者： Wang Du De-Teng Zhang Xue-Mei Wang tan-chen Ren Chang-You Gao Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

Dynamic control of mesenchymal stem cell(MSC)behaviors on biomaterial surface is critically involved in regulating the cell fate and tissue ***,a stimuli-responsive surface based on host-guest interaction with cell selectivity was developed to regulate migration of MSCs in situ by dynamic display of cell-specific ***-grafted MSC-affinitive peptides(EPLQLKM,Azo-E7)were grafted toβ-cyclodextran(β-CD)-modified poly(2-hydroxyethyl methacrylate)-b-poly(2-hydroxyethyl methacrylate-co-glycidyl methacrylate)(PHG)brushes,which were prepared by using surface-initiated atom transfer radical polymerization(SI-ATRP).X-ray photoelectron spectroscopy(XPS),quartz crystal microbalance(QCM),and water contact angle were used to characterize their structure and *** adhesion assay showed that the combination effect of resisting property of PHG and MSC-affinity of E7 could promote the selective adhesion of MSCs over other types of cells such as RAW264.7 macrophages and NIH3 T3 fibroblasts to some ***-Vis spectroscopy proved that the competing guest molecules,amantadine hydrochloride(Ama),could release Azo-E7 peptides from the CD surface to different extents,and the effect was enhanced when UV irradiation was employed *** a result,the decrease of cell adhesion density and migration rate could be achieved in *** cell density and migration rate could be reduced by over 40%by adding 20μmol/L Ama,suggesting that this type of surface is a new platform for dynamic regulation of stem cell behaviors in situ.

关键词： Host-guest interaction MSC-affinitive peptide Dynamic surface Cell adhesion Cell migration

COLORFUL GARMENTS BRIGHT UP HUMEN

在线全文

学校读者我要写书评

暂无评论

大经贸 1997年第11期 93-95页

作者： chen Yan tan Jiahua

Humen people are proud of their heroic town for itsistory of incinerating opium and fighting againstforeign invasions which they have learned from his-tory ***,at their own festival,’97China(Humeri)International Garment Fair held fromOctober 18 to 23,they are experiencing more stronglyanother pride that contemporary Humen people haveeteated the time’s economic *** hasa lot to takepride of and SunYaoquan,secre-

关键词：多刀经贸

Combining CLUE-S and SWAT Models to Forecast Land Use Change and Non-point Source Pollution Impact at a Watershed Scale in Liaoning Province, China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2014年第5期24卷 540-550页

作者： LIU Miao LI Chunlin HU Yuanman SUN Fengyun XU Yanyan chen tan State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences University of Chinese Academy of Sciences

Non-point source(NPS) pollution has become a major source of water pollution. A combination of models would provide the necessary direction and approaches designed to control NPS pollution through land use planning. In this study, NPS pollution load was simulated in urban planning, historic trends and ecological protection land use scenarios based on the Conversion of Land Use and its Effect at Small regional extent(CLUE-S) and Soil and Water Assessment Tool(SWAT) models applied to Hunhe-Taizi River Watershed, Liaoning Province, China. Total nitrogen(TN) and total phosphorus(TP) were chosen as NPS pollution indices. The results of models validation showed that CLUE-S and SWAT models were suitable in the study area. NPS pollution mainly came from dry farmland, paddy, rural and urban areas. The spatial distribution of TN and TP exhibited the same trend in 57 sub-catchments. The TN and TP had the highest NPS pollution load in the western and central plains, which concentrated the urban area and farm land. The NPS pollution load would increase in the urban planning and historic trends scenarios, and would be even higher in the urban planning scenario. However, the NPS pollution load decreased in the ecological protection scenario. The differences observed in the three scenarios indicated that land use had a degree of impact on NPS pollution, which showed that scientific and ecologically sound construction could effectively reduce the NPS pollution load in a watershed. This study provides a scientific method for conducting NPS pollution research at the watershed scale, a scientific basis for non-point source pollution control, and a reference for related policy making.

关键词： Conversion of Land Use and its Effect at Small regional extent (CLUE-S) Hunhe-Taizi River Watershed non-point source pollution Soil and Water Assessment Tool (SWAT)

Values of endoscopic ultrasonography for diagnosis and treatment of duodenal protruding lesions

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第4期9卷 329-334页

作者： Guo-qiang XU Yi-qun WU Li-jun WANG Hong-tan chen Department of Gastroenterology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China Department of Pathology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective： The diagnoses of patients with duodenal protruding lesions are difficult when using conventional examinations such as computed tomography （CT） and conventional endoscope etc. Thus, we investigated the clinical value of endoscopic ultrasonography （PUS） with miniature ultrasonic probes on the diagnosis and treatment of duodenal protruding lesions. Methods： Patients with duodenal protruding lesions who were indicated for PUS were examined by PUS with 12-15 MHz miniature ultrasonic probes and double-cavity electronic endoscope. According to diagnosis of PUS, those patients were indicated for biopsy and treatment received biopsy, endoscopic resection or surgical excision. The postoperative histological results were compared with the preoperative diagnosis of PUS. Those patients without endoscopic resection or surgical excision were periodically followed up with PUS. Results： A total of 169 patients with duodenal protruding lesions were examined by PUS, of which 40 were diagnosed with cysts, 36 with inflammatory protruding or polyp, 25 with Brunner＇s gland adenoma, 19 with ectopic pancreas, 17 with gastrointestinal stromal tumor, 12 with extrinsic compression, 12 with minor papilla, 6 with lipoma, 1 with adenocarcinoma and 1 with lymphoma. After PUS examinations, 75 patients received biopsy, endoscopic resection or surgical excision respectively. The postoperative histological results of 70 patients were completely consistent with the preoperative diagnosis of PUS, with 93.33% diagnostic accuracy. The results of follow-up with PUS indicated that duodenal cyst, Brunner＇s gland adenoma, ectopic pancreas, gastrointestinal stromal tumor and lipoma remained unchanged within 1-3 years. No related complications occurred among all patients that received PUS examinations. Conclusion： PUS is an effective and reliable diagnostic method for duodenal protruding lesions.

关键词： Endoscopic ultrasonography (EUS) Duodenal protruding lesions Diagnosis Follow-up

Large heterotopic gastric mucosa and a concomitant diverticulum in the rectum:Clinical experience and endoscopic management

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2018年第30期24卷 3462-3468页

作者： Wen-Guo chen Hua-Tuo Zhu Ming Yang Guo-Qiang Xu Li-Hua chen Hong-tan chen Department of Gastroenterology The First Affiliated HospitalCollege of MedicineZhejiang University

Heterotopic gastric mucosa(HGM) in the rectum is an extremely rare clinical entity which may be missed or misdiagnosed due to a lack of *** the present study,a 14-year-old girl visited our hospital due to a 5-year history of repeated *** showed a solitary superficial depressed lesion approximately 5 cm in size and a concomitant 1.5 cm deep diverticulum in the *** examination of the endoscopic biopsy showed typical ectopic gastric mucosa in the depressed lesion and inside the *** band imaging further confirmed the histological *** ultrasound indicated that the lesion originated from the mucosal layer,and partially involved the submucosal *** submucosal dissection was performed in this patient due to the large size and shape of the *** bleeding,perforation or other adverse events were *** presence of HGM in the diverticular cavity greatly increased the surgical difficulty.A literature review was also carried out in our study.

关键词： Endoscopic submucosal dissection Rectum Helicobacter pylori Endoscopy Heterotopic gastric mucosa

Numerical modeling and performance evaluation of passive convergence-permeable reactive barrier(PC-PRB)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第11期17卷 131-144页

作者： Kaixuan Zheng Dong Xie Yiqi tan Zhenjiang Zhuo tan chen Hongtao Wang Ying Yuan Junlong Huang Tianwei Sun Fangming Xu Yuecen Dong Ximing Liang School of Environment Tsinghua UniversityBeijing 100084China College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

The passive convergence-permeable reactive barrier(PC-PRB)was proposed to address the limitations of traditional PRB *** evaluate the hydraulic and pollutant removal performance of the PC-PRB system,we developed a simulation code named *** code uses the two-dimensional(2D)finite element method to simulate groundwater flow and solute *** studies demonstrate that PC-PRB technology is more efficient and cost-effective than continuous permeable reactive barrier(C-PRB)in treating the same contaminated *** of PC-PRB technology results in a 33.3%and 72.7%reduction in PRB length(L_(PRB))and height(H_(PRB)),respectively,while increasing 2D horizontal and 2D vertical pollutant treatment efficiencies of PRB by 87.8%and 266.8%,*** addition,the PC-PRB technology has the ability to homogenize the pollutant concentration and pollutant flux through the PRB system,which can mitigate the problems arising from uneven distribution of pollutants in the C-PRB to some *** L_(PRB)required for PC-PRB decreases as the water pipe length(L_(p))increases,while the H_(PRB)required initially decreases and then increases with increasing L_(p).The effect of passive well height(Hw)on H_(PRB)is not as significant as that of L_(p)on H_(PRB).Overall,PC-PRB presents a promising and advantageous PRB configuration in the effective treatment of various types of contaminated plumes.

关键词： Passive convergence-permeable reactive barrier Numerical modeling Hydraulic behavior assessment Pollutant treatment performance evaluation Influential factors analysis

VOICE ACTIVITY DETECTION UNDER RAYLEIGH DISTRIBUTION

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2009年第4期26卷 552-556页

作者： Li Yu chen Jianming tan Hongzhou School of Information Science and Technology Sun Yat-Sen University Guangzhou 510275 China

This paper presents an improved Voice Activity Detection （VAD） algorithm which uses the Signal-to-Noise Ratio （SNR） measure. We assume that noise Power Spectral Density （PSD） in each spectral bin follows a Rayleigh distribution. Rayleigh distributions with its asymmetric tail characteristics give a better description of the noise PSD distribution than Gaussian distribution. Under this asstlmption, a new threshold updating expression is derived. Since the analytical integral of the false alarm probability, the threshold updating expression can be represented without the inverse complementary error function and low computational complexity is achieved in our system. Experimental results show that the proposed VAD outperforms or at least is comparable with the VAD scheme presented by Davis under several noise environments and has a lower computational complexity.

关键词： Statistical Voice Activity Detection (VAD) Threshold update Rayleigh distribution Computational complexity

Multiple gastric angiolipomas: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第6期7卷 778-784页

作者： Xin-He Lou Wen-Guo chen Long-Gui Ning Hong-tan chen Guo-Qiang Xu Department of Gastroenterology The First Affiliated HospitalCollege of MedicineZhejiang University

BACKGROUND Angiolipoma is a benign tumor and is generally found in subcutaneous *** are rare in the gastrointestinal tract,including the *** diagnosis of the tumor is difficult,although there are several radiological examinations such as computed tomography and endoscopic *** SUMMARY We report a 24-year-old Chinese man with multiple gastric angiolipomas,with a positive stool occult blood examination. Endoscopic biopsy only showed nonspecific inflammation. Histological examination of the specimen by endoscopic snare resection showed that the tumor consisted of adipose tissues and blood vessels. We also performed a literature review. After the use of proton pump inhibitor,the fecal occult blood test was negative. Due to the difficulty of resecting multiple lesions in the stomach completely and the benign characteristics of angiolipoma,we chose to have regular upper gastrointestinal endoscopy evaluation of the lesion. No evidence of significant change in lesion size was detected after 3-years *** Gastric angiolipoma is rare,and benign neoplasm should be considered when lesions occur submucosally in the gastrointestinal tract.

关键词： Angiolipoma Gastric angiolipoma Endoscopic snare resection Case report

Unexpected complexity of multidrug resistance in the mcr-1-harbouring Escherichia coli

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2016年第7期59卷 732-734页

作者： Rongsui Gao Yue Li Jingxia Lin chen tan Youjun Feng Department of Medical Microbiology and Parasitology Zhejiang University School of Medicine State Key Laboratory of Agricultural Microbiology College of Veterinary Medicine Huazhong Agricultural University

Dear Editor, The discovery that the mobile colistin resistance gene （mcr-1） is encoded by plasmids and is prevalent in food animals and human beings worldwide （Hasman et al., 2015; Liu et al., 2015） has challenge... 详细信息

关键词：大肠埃希菌复杂性耐药多粘菌素抗性基因食品动物哈斯曼