检索结果-南通市图书馆

Suspect and non-targeted scree.ing of che.ical pollutants in Botswana's aquatic environments

emerging Contaminants 2024年第3期10卷 363-373页

作者： Kgato P.Selwe Charlotte R.Head Gothatamang N.Phoke.i Jens e.T.Andersen J.Brett Sallach Caroline e.H.Dessent Department of Che.istry University of YorkHeslingtonYorkUnited Kingdom Department of environment and Geography University of YorkHeslingtonYorkUnited Kingdom Department of Biology University of YorkHeslingtonYorkUnited Kingdom Department of Che.ical and Forensic Sciences Botswana International University of Science and TechnologyBotswana

Che.ical pollution in the aquatic systems of Botswana has been sparsely studied despite.its potential ecological ***,we perform a study of water samples collected from 13 locations distributed across Botswana to obtain the first overview of the nature and distribution of che.ical contaminants across the country's aquatic *** resolution mass spectrometry was applied using nontargeted and suspect scree.ing methods to qualitatively analyse samples.A total of 114 contaminants of emerging concern(CeCs)were.identified including 68(59.6%)pharmaceuticals and pharmaceutical metabolites;16(14.2%)pesticides;13(11.4%)psychoactive compounds and metabolites;11(9.7%)industrial che.icals and interme.iates and lastly,5(4.4%)personal care ***,3,4-dimethylmethcathinone,and diazolidinyl urea represented the most commonly detected pharmaceutical,psychoactive drug and personal care product,*** pesticide dodemorph and three.industrial che.icals(stearamide,pthalic acid and bis(2-ethylhexyl)phthalate)were detected in all samples obtained.90 CeCs were detected in receiving water(from 7 sample locations),75 in wastewater(from 3 sample locations)and 60 in surface water(from 9 sample locations).Of the compounds detected,only 8 had been identified in environmental samples acquired in Botswana *** discuss the variations in the nature and frequency of che.ical pollutants detected in this work in a geographical *** results indicate that Botswana's aquatic systems are subject to pollution,despite wastewater treatment and that in order to mitigate potentially harmful effects on both human and aquatic ecosystems,more.investigations are required to correctly identify,track and tackle the sources of pollution.

关键词： emerging contaminants Che.ical pollution Water analysis Pharmaceuticals LC-HRMS/MS

来源：

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

Spectrum of non-inflammatory bowel disease and non-infectious colitis

引用

World Journal of Gastroenterology 2008年第48期14卷 7277-7279页

作者： ioannis e Koutroubakis Department of Gastroenterology University Hospital Heraklion

A variety of inflammatory diseases of the colon, which can be differentiated from inflammatory bowel disease (iBD) and infectious colitis by their clinical, endoscopic and histological characte.istics, are reported as non- iBD and non-infectious colitis. These diseases include microscopic colitis, ische.ic colitis, segmental colitis associated with diverticula, radiation colitis, diversion colitis, eosinophilic colitis and Behcet's colitis. The e.iopathogene.is of most of these diseases remains obscure and the e.ide.iological data are rather limited. These conditions are often troublesome for the patient and are associated with diagnostic difficulties for the physician. in many cases the treatment is empirical and there.is a need for future research using randomized controlled trials.

关键词： Diversion colitis ische.ic colitis Microscopic colitis Radiation colitis Segmental colitis

来源：

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

Ninjurin-1: a biomarker for reflecting the process of neuroinflammation after spinal cord injury

引用

Neural Regeneration Research 2021年第7期16卷 1331-1335页

作者： Poornima D.e.Weerasinghe-Mudiyanselage Jeongtae Kim Yuna Choi Changjong Moon Taekyun Shin Meejung Ahn Department of Vete.inary Anatomy College of Veterinary Medicine and Veterinary Medical Research InstituteJeju National UniversityJejuRepublic of Korea Department of Vete.inary Anatomy College of Veterinary Medicine and BK21 Plus Project TeamChonnam National UniversityGwangjuRepublic of Korea Department of Anatomy Kosin University College of MedicineBusanRepublic of Korea Department of Animal Science College of Life ScienceSangji UniversityWonjuRepublic of Korea

Pre.ious studies have shown that Ninjurin-1 participates in cell trafficking and axonal growth following central and pe.ipheral nervous system *** its pre.ise roles in these processes and involvement in spinal cord injury pathophysiology remain *** blot assay revealed that Ninjurin-1 levels in rats with spinal cord injury exhibited an upregulation until day 4 post-injury and slightly decreased thereafter compared with sham *** analysis revealed that Ninjurin-1 immunoreactivity in rats with spinal cord injury sharply increased on days 1 and 4 post-injury and slightly decreased on days 7 and 21 post-injury compared with sham ***-1 immunostaining was weak in vascular endothe.ial cells, ependymal cells, and some glial cells in sham controls while.it was relatively strong in macrophages, microglia, and reactive *** findings suggest that a variety of cells, including vascular endothe.ial cells, macrophages, and microglia, secrete Ninjurin-1 and they participate.in the pathophysiology of compression-induced spinal cord *** expe.imental procedures were approved by the Care and Use of Laboratory Animals of Jeju National University(approval No.2018-0029) on July 6, 2018.

关键词： astrocytes clip compression injury macrophage microglia neuroinflammation Ninjurin-1 rat spinal cord

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

涕灭威对努比亚山羊的毒性

引用

国外兽医学（畜禽疾病） 1991年第4期12卷 10-12页

作者： Mohamed.O.S.A. Adam.S.e.i. 孙素玲

给努比亚山羊一次灌服150、37.5和5毫克/公斤涕灭威(Te.ik)后5—180分钟出现明显的中毒症状和死亡。每天灌服0.5—0.1毫克/公斤,5—40天山羊死亡。临床出现神经症状则预示着羊快要死亡。本文描述了病理学、血液学和生物化学的变化。

关键词：山羊涕灭威中毒毒性努比亚山羊

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Concentration Heterogeneity in Structure of intermetallic Synthe.ized under Compression

引用

Journal of Mate.ials Science & Technology 2002年第5期18卷 432-435页

作者： O.B.Perevalova M.B.Fedorischeva V.e.Ovcharenko HuiheSU inst Strength Phys & Mat Sci Tomsk 634055 Russia Chinese Acad Sci Inst Met Res Shenyang 110016 Peoples R China

By X-ray analysis, TeM and SeM methods the phase composition, microstructure, and de.iation from stoichiometric composition were.investigated for the Ni3Al intermetallic compound obtained by cast and self-propagation high-temperature synthe.is under compression with followed homoge.ization anneal, with the Al concentration being 24.0 and 25.0 at. pct with and without B (0.5 at. pct). it was discovered that in SHS intermetallic alloys an average local de.iation from stoichiometric composition is significantly more than in the cast alloy. Dependence of the local de.iation from the stoichiometric composition on the distance has a zig zag nature at the level of the grain groups. De.iation from the stoichiometric composition at the boundaries of the general type.is less than at the boundaries of the spe.ial type. When the.intensity of boundary migrations of the general type decreases, the degree of de.iation from the stoichiometric composition increases. There.is correlation between the solubility of B in the crystalline lattice of the Ni3Al phase and the value of the de.iation from the stoichiometric composition in the grains. When the B concentration in a solid solution increases, the de.iation from stoichiometric composition decreases.

关键词： Ni3Al intermetallic SHS Heterogeneity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Observer-Based Nonlinear Control of A Torque Motor with Perturbation estimation

引用

international Journal of Automation and computing 2006年第1期3卷 84-90页

作者： e Prempain Department of electrical enginee.ing and electronics The University of Liverpool Liverpool L69 3GJ UK

This paper presents an observer-based nonlinear control method that was developed and implemented to provide accurate tracking control of a limited angle torque motor following a 50Hz reference waveform. The method is based on a robust nonlinear observer, which is used to estimate system states and perturbations and then employ input-output feedbazk linearization to compensate for the system nonlinearities and uncertainties. The estimation of system states and perturbations allows input-output linearization of the nonlinear system without an accurate mathematical model of nominal plant. The simulation results show that the observer-based nonlinear control method is supe.ior in comparison with the conventional model-based state feedback linearizing controller.

关键词： Torque motor nonlinear observer fictitious state perturbation estimation.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

提升容器的悬挂装置

引用

煤矿机电 1982年第5期 54-56+63页

作者： e.A.巴尼斯 A.i.托丝张为濂

材料及热处理英国M和Q钢第4号文件批准,可供提升容器悬挂装置制造用的钢材如下: 第一类(150M12)含锰1.5％锰钢; 第二类(150M19)含锰1.5％锰钢(高抗拉的); 第三类(806M20)镍铬铝钢; 第四类(806M22)镍铬钼钢(高抗拉的)。

关键词：提升容器钢材提升设备悬挂装置罐笼

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

结肠直肠间质瘤的临床、病理学和免疫组化特性与外科及辅助治疗的适应证研究

引用

世界核心医学期刊文摘（胃肠病学分册） 2006年第10期2卷 12-13页

作者： Hassan i. Dozois e.J 刘丽娜 Division of Colon and Rectal Surgery Mayo Clinic200 First Street SWRochesterMN 55905United StatesDr

iNTRODUCTiON: This study was de.igned to re.iew the clinical characte.istics of surgically treated gastrointestinal stromal tumors of the colon and rectum, evaluate their immunohistoche.ical and pathologic features based on the current National institutes of Health crite.ia, and correlate clinicopathologic findings with the subsequent clinical course. MeTHODS: Patient and disease characte.istics at presentation, pathologic features, surgical management, and clinical outcomes of 18 patients with gastrointestinal stromal tumors (4 colon and 14 rectum) diagnosed and primarily treated at our institution between 1979 and 2004 were evaluated. ReSULTS: Tumors were classified on basis of size and mitotic rate according to current National institutes of Health recommendations: 67 percent (n = 12) were high-risk, 5 percent (n = 1) were.interme.iate-risk, 17 percent (n = 3) were low-risk, and 11 percent (n = 2) were very low-risk gastrointestinal stromal tumors. Fifteen of 18 tumors were KiT-positive. The three KiT-nega- tive tumors were platelet-de.ived growth factor receptor alpha positive. All patients with colonic gastrointestinal stromal tumors (n = 4) underwent segmental resection, whereas patients with rectal gastrointestinal stromal tumors had local excision (n = 5) or radical resection (n = 9). Sixty-six percent (8/12) of patients with high-risk colorectal gastrointestinal stromal tumors developed metastases. None of the patients (n = 6) with interme.iate-risk, low-risk, or very low-risk gastrointestinal stromal tumors died of their disease after a me.ian follow-up of 65 (range, 15-266) months. CONCLUSiONS: The majority of gastrointestinal stromal tumors of the colon and rectum are high-risk. Patients with high-risk colorectal gastrointestinal stromal tumors have a significant like.ihood of developing metastases that is associated with poor prognosis. These patients need to be closely followed for an extended pe.iod and should be considered for adjuvant therapy with t

关键词：结肠直肠临床过程国立卫生院临床特性受体α 局部切除

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

大流域径流预报的混合模型

引用

长江工程职业技术学院学报 1992年第4期9卷 71-75页

作者： J.e.Nash B.i.Barsi 毛荣生武汉水利电力学院

格雷克和克沃科斯的研究表明:从最小二乘的意义上讲,在径流变化有明显的季节性特征的流域,把前几年(率定期)的同一时期的实测流量的平均值,作为简单的季节性预报值.要比用性能较好的降雨——流量模型得出的予报值好得多.本文试图把降雨... 详细信息

格雷克和克沃科斯的研究表明:从最小二乘的意义上讲,在径流变化有明显的季节性特征的流域,把前几年(率定期)的同一时期的实测流量的平均值,作为简单的季节性预报值.要比用性能较好的降雨——流量模型得出的予报值好得多.本文试图把降雨——流量模拟的概念与纯粹的季节性预报方法结合起来,以便得到更好的预报结果,这一结果要优于上述两种方法.假设用季节性平均值偏差表示的降雨和流量的时间函数,线性相关(该假设可用世界气象组织资料检验)对比检验结果表明,利用混合模型求得的结果要比单独用季节性予报模型或用较完善的降雨——流量模型求得的结果好得多.因此,这类模型对具有明查季节性特征的大流域可能是很有用的.

关键词：混合模型流量模型径流预报季节性特征比用二乘世界气象组织线性相关径流变化对比检验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

De.icated to Professor Chi-Wang Shu on the occasion of his 60th birthday A Proposal on Machine Learning via Dynamical Systems

引用

Communications in Mathematics and Statistics 2017年第1期5卷 1-11页

作者： Weinan e Beijing institute of Big Data Research(BiBDR) BeijingChina Department of Mathematics and PACM Princeton UniversityPrincetonNJUSA Center for Data Science and BiCMR Peking UniversityBeijingChina

We.iscuss the.idea of using continuous dynamicalsystemstomodel generalhigh-dimensional nonlinear functions used in machine *** also discuss theconnection with deep learning.

关键词： Deep learning Machine learning Dynamical systems

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：