检索结果-南通市图书馆

HDPairFinder:A data processing platform for hydrogen/deuterium isotopic labeling-based nontargeted analysis of trace-level amino-containing chemicals in environmental water

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2024年第2期136卷 583-593页

作者： Tingting Zhao Kristin Carroll Caley B.Craven nicholas J.P.Wawryk shipei Xing jian Guo Xing-Fang Li Tao Huan department of Chemistry Faculty of ScienceUniversity of British ColumbiaVancouver Campus2036 Main MallVancouverBritish ColumbiaV6T 1Z1Canada division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of AlbertaEdmontonAlberta T6G 2G3Canada

The combination of hydrogen/deuterium(H/D)formaldehyde-based isotopic methyl labeling with solid-phase extraction and high-performance liquid chromatography–high resolution mass spectrometry(HPLC-Hrms)is a powerful analytical solution for nontargeted analysis of trace-level amino-containing chemicals in water *** the huge amount of chemical information generated in HPLC-Hrms analysis,identifying all possible H/Dlabeled amino chemicals presents a significant challenge in data *** address this,we designed a streamlined data processing pipeline that can automatically extract H/D-labeled amino chemicals from the raw HPLC-Hrms data with high accuracy and ***,we developed a cross-correlation algorithm to correct the retention time shift resulting from deuterium isotopic effects,which enables reliable pairing of H-and D-labeled ***,we implemented several bioinformatic solutions to remove false chemical features generated by in-source fragmentation,salt adduction,and natural13C ***,we used a data mining strategy to construct the AmInEs library that consists of over 38,000 structure-disjointed primary and secondary amines to facilitate putative compound ***,we integrated these modules into a freely available r program,*** rationale of each module was justified and its performance tested using experimental H/D-labeled chemical standards and authentic water *** further demonstrated the application of HDPairFinder to effectively extract n-containing contaminants,thus enabling the monitoring of changes of primary and secondary n-compounds in authentic water *** is a reliable bioinformatic tool for rapid processing of H/D isotopic methyl labeling-based nontargeted analysis of water samples,and will facilitate a better understanding of n-containing chemical compounds in water.

关键词： Isotope labeling nontargeted analysis reactive n-compounds HPLC-Hrms source water

金沙江奔子栏-达日河段大型泥石流堆积扇的成因机制

在线全文

学校读者我要写书评

暂无评论

山地学报 2011年第3期29卷 312-319页

作者：陈剑崔之久戴福初许冲中国地质大学(北京)工程技术学院北京大学城市与环境学系中国科学院地质与地球物理研究所青藏高原研究室

金沙江上游奔子栏-达日河段属横断山区的干热河谷地带,河谷沿岸大型古泥石流堆积扇广泛发育,其成因却一直没有得到很好的研究。对该区瓦卡大型古泥石流堆积物进行了沉积结构、粒度、地球化学和孢粉等分析,揭示了泥石流的沉积环境及其形... 详细信息

金沙江上游奔子栏-达日河段属横断山区的干热河谷地带,河谷沿岸大型古泥石流堆积扇广泛发育,其成因却一直没有得到很好的研究。对该区瓦卡大型古泥石流堆积物进行了沉积结构、粒度、地球化学和孢粉等分析,揭示了泥石流的沉积环境及其形成过程。通过粗颗粒石英的光释光单片再生法(sAr)测年研究,获得金沙江上游奔子栏-达日河段古泥石流大规模暴发的年代为12 600~4 500 a BP。丰富的风化碎屑物源、陡峻的地形及雨季降水集中是该区古泥石流形成的主要原因。全新世早期青藏高原东南缘受西南季风加强的影响,气候趋于暖湿,季节性暴雨增加。金沙江上游干热河谷区大型泥石流堆积扇的发育年代暗示其是全新世早期西南季风加强作用下的地貌响应。从地质灾害防治的角度,由于现代气候因素导致泥石流灾害的频度和规模较小,预防该区地质灾害的重点应是防止人工砍伐树木和不合理的人工切坡导致对地表环境的破坏加剧。

关键词：金沙江干热河谷泥石流堆积扇气候变化

Toughness and characterization of reactive powder concrete with ultra-high strength

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science China(Technological sciences) 2009年第4期52卷 1000-1018页

作者： yang Ju HongBin Liu jian Chen YuDan Jia PeiHuo Peng state Key Laboratory of Coal resources and safe mining China University of Mining & Technology Beijing 100083 China department of mechanical & manufacturing Engineering The University of Calgary 2500 University Drive NW Calgary AB T2N 1N4 Canada The university of Illinois at Urbana-Champaign 1110 West Green Street Urbana IL 61801 USA Building Design division China Nuclear Power Engineering Co. Ltd Beijing 100840 China school of Civil Engineering University of Nottingham University Park Nottingham NG7 2RD UK

A number of three-point bending and fracture tests of 200 mPa-level reactive powder concrete (rPC) with the various fiber contents have been conducted to probe the nature and characteristics of toughness of rPC200. The contribution of the embedded fibers to improving the crack-resistant capacity, energy absorption capacity and toughness with various deformation mechanisms has been analyzed. Taking account of that the first-crack deformation, peak-load deformation and their improvement varied with the fiber contents and that the deformation mechanism affected differently the performance at the first crack and the peak load, we took the peak-load deformation of plain rPC200 as the reference deformation to measure the toughness of fibered rPC200. Two toughness indices T sUB>2(n−1)sUB>(n) and FT sUB>2(n−1)sUB>(n) have been formulated based on P-δ responses and P-CmOD responses. The indices quantify the toughness of rPC200 with the various deformation mechanisms relative to perfectly elastoplastic materials by setting the toughness level 2(n−1) as the initial reference. It is shown that the toughness index T sUB>2(n−1)sUB>(n) reflects the function of fibers to improve the toughness of rPC with the deformation throughout specimens, but overestimates the contribution to enhancing the toughness in post-peak periods. It underestimates, on other hands, the contribution to improving the toughness in the period from the first crack to the peak load. In contrast, the toughness index FT sUB>2(n−1)sUB>(n) properly presents the capability that fibers absorb energy and constrain crack propagation in the matrix when the deformation is concentrated on the open crack. The proposed index unveils the contribution of fibers to toughening rPC200 both in the period from the first-crack to the peak load and in the period of post peak. This characterization method not only reveals the nature of toughness but also levels the toughness of rPC200. I

关键词： reactive powder concrete toughness characterization index deformation mechanism flexure fracture

在线全文

学校读者我要写书评

暂无评论

储层成岩—储集相划分方法

天然气工业 2004年第10期24卷 27-29页

作者：宋成辉李晓陈剑卢华复张春雷中国科学院地质与地球物理研究所工程地质重点实验室南京大学石油大学

在油田开发中后期,利用储层的成岩和储集参数资料来划分储层的有利部位,指导油田的开发。研究中,根据岩心实验分析资料和测井资料,计算主要反映储层性能的成岩和储集参数视压实率,视胶结率,成岩综合系数,孔隙度,渗透率,孔喉半径平均值... 详细信息

在油田开发中后期,利用储层的成岩和储集参数资料来划分储层的有利部位,指导油田的开发。研究中,根据岩心实验分析资料和测井资料,计算主要反映储层性能的成岩和储集参数视压实率,视胶结率,成岩综合系数,孔隙度,渗透率,孔喉半径平均值。按照这些参数分类标准,通过计算机编程,运用模糊聚类方法将各口井的各小层共n个样本的m个参数看作m×n维空间的点,直接用样品隶属度将其分类,从而划分了成岩—储集相。模糊聚类方法很好地解决了多参数综合分类困难,快速准确地将枣南油田孔一段V油组划分了Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ类成岩—储集相,其中Ⅰ类成岩—储集相为储层性能最好部位,Ⅴ类为最差部位。根据划分结果调整了油田注采井关系,解决了注不进、采不出的问题。

关键词：成岩储层油田开发孔喉岩心实验注采井胶结储集划分测井资料

Epigallocatechin-3-gallate/mineralization precursors co-delivery hollow mesoporous nanosystem for synergistic manipulation of dentin exposure

在线全文

学校读者我要写书评

暂无评论

Bioactive materials 2023年第5期23卷 394-408页

作者： jian Yu Haolin Bian Yaning Zhao Jingmei Guo Chenmin Yao He Liu Ya shen Hongye yang Cui Huang The state Key Laboratory Breeding Base of Basic science of stomatology(Hubei-mOsT)&Key Laboratory for Oral Biomedicine ministry of Education School and Hospital of StomatologyWuhan UniversityWuhan430079China division of Endodontics Department of Oral Biological and Medical SciencesFaculty of DentistryUniversity of British ColumbiaVancouverV6T 1Z3Canada

As a global public health focus,oral health plays a vital role in facilitating overall *** teeth characterized by exposure of dentin generally increase the risk of aggravating oral *** exposed dentinal tubules provide channels for irritants and bacterial invasion,leading to dentin hypersensitivity and even pulp *** bacterial adhesion and biofilm formation on dentin are responsible for tooth demineralization and *** remains a clinical challenge to achieve the integration of tubule occlusion,collagen mineralization,and antibiofilm functions for managing exposed *** address this issue,an epigallocatechin-3-gallate(EGCG)and poly(allylamine)-stabilized amorphous calcium phosphate(PAH-ACP)co-delivery hollow mesoporous silica(Hms)nanosystem(E/PA@Hms)was herein *** application of E/PA@Hms effectively occluded the dentinal tubules with acid-and abrasion-resistant stability and inhibited the biofilm formation of streptococcus *** mineralization of collagen fibrils and remineralization of demineralized dentin were induced by E/PA@*** odontogenic differentiation and mineralization of dental pulp cells with high biocompatibility were also *** experiments showed that E/PA@Hms durably sealed the tubules and inhibited biofilm growth up to 14 ***,the development of the E/PA@Hms nanosystem provides promising benefits for protecting exposed dentin through the coordinated manipulation of dentin caries and hypersensitivity.

关键词： Amorphous calcium phosphate Antibiofilm Dentin Hollow mesoporous silica mineralization Tubule occlusion

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

分频CmY融合技术在河道刻画中的应用

工程地球物理学报 2024年第1期21卷 127-135页

作者：袁悦李帅姜雪中海石油(中国)有限公司上海分公司上海200335

西湖凹陷n构造区花港组及浅部龙井组地层发育多种类型河道砂体,砂体厚度横向变化快,准确识别目的层河道展布是该地区储层预测的关键。本次研究综合应用分频CmY(C-cyan,青色;m-magenta,洋红色;Y-yellow,黄色;三种颜色的简写)融合与地震... 详细信息

西湖凹陷n构造区花港组及浅部龙井组地层发育多种类型河道砂体,砂体厚度横向变化快,准确识别目的层河道展布是该地区储层预测的关键。本次研究综合应用分频CmY(C-cyan,青色;m-magenta,洋红色;Y-yellow,黄色;三种颜色的简写)融合与地震沉积学技术,对地震数据进行全频段扫描,通过分频得到单频地震数据体,在此基础上选取有利频段地震数据进行CmY体融合,结合地震沉积学方法制作融合数据体目的层地层切片,通过调节切片上不同颜色所占比例及亮度显示强度,横向上凸显不同规模河道展布特征,纵向上分析不同期次河道演化特征。基于此,最终在n构造区花港组H2层刻画6或7条辫状河河道,在H3层刻画5条河道;在浅部龙井组刻画7条不同规模河道。该方法较常规地震属性刻画河道边界清晰,对河道沉积物厚度、粒度等信息都有响应,可为该地区岩性油气藏勘探提供一定的指导。

关键词：西湖凹陷 CmY融合分频技术河道砂体地震沉积学

Characteristics of home oxygen therapy for preterm infants with bronchopulmonary dysplasia in China:results of a multicenter cohort

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2023年第6期19卷 557-567页

作者： wen-Xing jiang Yan-Chen Wang Hong-Xia song mi Xiao Fan He si-Yuan jiang Xin-Yue Gu jian-Hua sun Yun Cao wen-Hao Zhou shoo Kim Lee Li-Ping Chen Li-Yuan Hu division of neonatology Jiangxi Provincial Children’s Hospital1666 Diezihu AvenueHonggutan New AreaNanchang 330038China nHC Key Laboratory of neonatal Diseases Fudan UniversityChildren’s Hospital of Fudan UniversityShanghai 201102China division of neonatology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China division of neonatology Children’s Hospital of Fudan University399 Wanyuan RoadMinhang DistrictShanghai 201102China division of neonatology Shanghai Children’s Medical CenterShanghai Jiao Tong University School of MedicineShanghai 200127China maternal-Infants Care research Centre and department of Pediatrics Mount Sinai HospitalTorontoON M5G 1X5Canada university of toronto TorontoON M5T 3M7Canada

Background Home oxygen therapy(HOT)is indicated upon discharge in some preterm infants with severe bronchopulmonary dysplasia(BPD).There is a lack of evidence-based consensus on the indication for HOT among these *** wide variation in the institutional use of HOT exists,little is known about the role of regional social-economic level in the wide variation of *** This was a secondary analysis of Chinese neonatal network(CHnn)data from January 1,2019 to December 31,*** at gestational agess,with a birth weight500 g,and with moderate or severe BPD who survived to discharge from tertiary hospitals located in 25 provinces were included in this *** with major congenital anomalies and those who were discharged against medical advice were *** Of 1768 preterm infants with BPD,474 infants(26.8%)were discharged to home with *** proportion of HOT use in participating member hospitals varied from 0 to 89%,with five of 52 hospitals’observing proportions of HOT use that were significantly greater than expected,with 14 hospitals with observing proportions significantly less than expected,and with 33 hospitals with appropriate *** noted a negative correlation between different performance groups of HOT and median GDP per capita(P=0.04).Conclusions The use of HOT varied across China and was negatively correlated with the levels of provincial economic levels.A local HOT guideline is needed to address the wide variation in HOT use with respect to different regional economic levels in countries like China.

关键词： Bronchopulmonary dysplasia Chinese neonatal network Gross domestic product Home oxygen therapy Preterm infants

Corrigendum to“Epigallocatechin-3-gallate/mineralization precursors co-delivery hollow mesoporous nanosystem for synergistic manipulation of dentin exposure”[***.23(2023)394-408]

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

Bioactive materials 2023年第8期26卷 321-322页

The authors regret the incorrect publication of Fig.5,which was not identified during the proofing *** a self-check,we unfortunately found that the insets(250μg/mL,1 day)in Fig.5b/c and the image(1000μg/mL,3 days)in Fig.5c were mistakenly used during figure *** tracked down the original data obtained in June 2022,and have replaced Fig.5 with the correct image as *** authors would like to apologise for any inconvenience caused and state that the correction does not change the scientific conclusions of the article in any way.

关键词： correction image synergistic

Chinese expert consensus on organ protection of transplantation(2022 edition)

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

Hepatobiliary & Pancreatic Diseases International 2022年第6期21卷 516-526页

作者： jian-Hui Li Xiao Xu Yan-Feng Wang Hai-yang Xie Jing-Yu Chen nian-Guo Dong mitesh Badiwala Li-ming Xin roberto Vanin Pinto ribeiro Hao Yin Hao Zhang jian-Zheng Zhang Feng Huo Jia-Yin yang Hong-Ji yang Hui Pan shao-Guang Li Yin-Biao Qiao Jia Luo Hao-Yu Li Jun-Jun Jia Hao Yu Han Liang si-Jia yang Hao Wang Zhong-yang Liu Li-Cheng Zhang Xiao-Yi Hu Hao Wu Yi-Qing Hu Pei-Fu Tang Qi-Fa Ye shu-sen Zheng department of Hepatobiliary and Pancreatic surgery Department of Liver TransplantationShulan(Hangzhou)HospitalZhejiang Shuren University School of MedicineHangzhou 310022China department of Hepatobiliary and Pancreatic surgery Hangzhou First People’s HospitalZhejiang University School of MedicineHangzhou 310000China Zhongnan Hospital of Wuhan university Institute of Hepatobiliary Diseases of Wuhan UniversityTransplant Center of Wuhan UniversityHubei Key Laboratory of Medical Technology on TransplantationWuhan 430062China nHC Key Laboratory of Combined multi-organ Transplantation Hangzhou 310003China Wuxi Lung Transplantation Center Wuxi People’s Hospital Affiliated with Nanjing Medical UniversityWuxi 214023China department of Cardiovascular surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Peter munk Cardiac Centre Toronto General Hospital-University Health NetworkTorontoCanada school of Computer Engineering and science Shanghai UniversityShanghai 200444China Organ Transplant Center Shanghai Changzheng HospitalShanghai 200003China department of Orthopedics Chinese PLA General HospitalBeijing 100039China national Clinical research Center for Orthopedics Sports Medicine&RehabilitationBeijing 100039China department of surgery General Hospital of Guangzhou Military Command of PLAGuangzhou 510040China department of Liver surgery Liver Transplantation CenterWest China Hospital of Sichuan UniversityChengdu 610041China Organ Transplantation Center Sichuan Provincial People’s Hospital and School of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 610072China department of Lung Transplantation The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China division of Hepatobiliary Pancreatic surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Introduction Organ transplantation increases survival and improves qual-ity of life to many patients with end-stage organ ***-gan shortage is a worldwide problem that restricts organ trans-plantation[1].Organ procurement and preservation as well as ischemia-reperfusion injury(IrI)after transplantation are the im-portant factors affecting prognosis of *** the de-velopment of organ transplantation technology in the 20th cen-tury,organ protection technology has been a most promising con-cept in this *** preservation solutions such as the Collins solution,university of Wisconsin(UW)solution,and histidine-tryptophan-ketoglutarate(HTK)solution were developed sequen-tially[2],which developed rapidly in static cold storage(sCs)*** remains the standard preservation technique for organ transplantation[2].

关键词： organ preservation transplantation