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Crystal structure,dielectric,ferroelectric and energy storage properties of La-doped BaTiO_(3) semiconducting ceramics

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journal of Advanced Dielectrics 2015年第3期5卷 65-73页

作者： Venkata Sreenivas Puli Patrick Li Shiva Adireddy douglas B.Chrisey Department of Physics and Engineering Physics Tulane University New OrleansLA 70118USA Department of Mechanical Engineering University of Texas at El PasoTX 78869USA

Polycrystalline La-doped BaTiO_(3)(Ba_(1-x)La_(x)TiO_(3))[x¼0;0:0005;0:001;0:003]ceramics(denoted as BTO,BLT1,BLT2,BLT3)were synthesized by conventional solid-state reaction method and characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and Raman *** and Raman spectra revealed single-phase tetragonal perovskite crystalline ***-saturated polarization–electric field(P–E)hysteresis loops were observed with the measurement frequency of 50Hz at room temperature and confirmed ferroelectric nature of these ceramics and a high recoverable electrical energy storage density of 0.350j/cm^(3) with energy efficiency(n)-9%,which is useful in energy storage capacitor *** studies revealed anomalies around 415–420K and near the Curie *** latter is attributed to the ferroelectric to paraelectric phase *** dielectric performances were obtained for La-doped samples sintered at 1350℃ for *** growth is inhibited with lanthanum(La)incorporation into the BTO *** temperature semiconducting behavior with positive temperature coefficient of resistivity(PTCR)behavior at TC is attributed to electron compensation mechanism.

关键词： BaTiO_(3) doping ferroelectric energy storage semicoductor PTCR

Numerical analysis 7th ed

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Algorithmic Foundation and Software Tools for Extracting Shoreline Features from Remote Sensing Imagery and LiDAR Data

2001年

作者： Richard L. Burden j. douglas Faires

来源：畅想之星图书光盘版（南... 评论

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journal of Geographic Information System 2011年第2期3卷 99-119页

作者： Hongxing Liu Lei Wang douglas j. Sherman Qiusheng Wu Haibin Su 不详

This paper presents algorithmic components and corresponding software routines for extracting shoreline features from remote sensing imagery and LiDAR data. Conceptually, shoreline features are treated as boundary lines between land objects and water objects. Numerical algorithms have been identified and de-vised to segment and classify remote sensing imagery and LiDAR data into land and water pixels, to form and enhance land and water objects, and to trace and vectorize the boundaries between land and water ob-jects as shoreline features. A contouring routine is developed as an alternative method for extracting shore-line features from LiDAR data. While most of numerical algorithms are implemented using C++ program-ming language, some algorithms use available functions of ArcObjects in ArcGIS. Based on VB .NET and ArcObjects programming, a graphical user’s interface has been developed to integrate and organize shoreline extraction routines into a software package. This product represents the first comprehensive software tool dedicated for extracting shorelines from remotely sensed data. Radarsat SAR image, QuickBird multispectral image, and airborne LiDAR data have been used to demonstrate how these software routines can be utilized and combined to extract shoreline features from different types of input data sources: panchromatic or single band imagery, color or multi-spectral image, and LiDAR elevation data. Our software package is freely available for the public through the internet.

关键词： Shoreline Extraction Remote Sensing Imagery LiDAR Data ArcGIS ArcObjects ***

Assessing the Suitability of the WorldClim Dataset for Ecological Studies in Southern Kenya

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journal of Geographic Information System 2018年第6期10卷 643-658页

作者： Tim j. L. Wango douglas Musiega Charles N. Mundia Department of Geomatic Engineering & Geospatial Information Systems Jomo Kenyatta University of Agriculture and Technology Juja Kenya Department of Geomatics and Geospatial Information Systems Dedan Kimathi University Nyeri Kenya

There have been numerous efforts to generate freely available climatic datasets for use in species distribution models, the most popular being the global climatic dataset known as WorldClim. The availability of such datasets is invaluable to scientists as many studies are performed in remote areas where no weather stations are found. However, many users do not critically assess the suitability of these datasets for their applications, and errors associated with global datasets are often assumed to be negligible. Understanding what a climate dataset can or cannot deliver requires the user to have a working knowledge of what the basic spatial climate-forcing factors are at the scale of his/her study, and to have a good understanding of the uncertainty in the dataset. In geographic studies, uncertainty is often described by the degree of error (uncertainty), or degree of accuracy (certainty) in data, and thematic uncertainty refers to the uncertainty in measures made for each variable, whereas temporal uncertainty refers to the uncertainty in time period represented by each variable. Here, we used climatic data from weather stations to investigate the climate-forcing factors in southern Kenya, and then used this weather station data to investigate the uncertainty in the WorldClim dataset. Results indicated that the nineteen core Worldclim variables, known as bioclimatic variables, accurately depicted the local variations in climate in the study area. However, whereas the monthly and seasonal temperature variables represented the same time period in different locations, the same was not true for the monthly and seasonal precipitation variables. The onset of rains is a key biological indicator, and scientists studying phenomena tied to the onset of rains need to keep in mind the temporal variations represented in the WorldClim dataset.

关键词： WorldClim Bioclimatic Variables Thematic Uncertainty Temporal Uncertainty

Bioactive compound identification and in vitro evaluation of antidiabetic and cytotoxic potential of Garcinia atroviridis fruit extract

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Food Bioscience 2023年第1期51卷 725-736页

作者： Muhammad Shahid Shazrul Fazry Ahmad Azfaralariff Ahmed Abdul Kareem Najm douglas Law Mukram M.Mackeen Department of Biological Sciences and Biotechnology Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600BangiSelangorMalaysia Department of Food Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600BangiSelangorMalaysia School of Industrial Technology Universiti Sains Malaysia11800GelugorPulau PinangMalaysia Faculty of Health and Life Sciences Inti International UniversityPersiaran Perdana BBN Putra Nilai71800NilaiNegeri SembilanMalaysia Department of Chemical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600BangiSelangorMalaysia Institute of Systems Biology(INBIOSIS) Universiti Kebangsaan Malaysia43600BangiSelangorMalaysia

With a continuous threat of type 2 diabetes mellitus(T2DM)worldwide,efforts to discover new alternatives are ongoing for its ***,the use of natural herbal products is promising to achieve this goal as it has been reported to have fewer side effects compared to synthetic *** atroviridis is one of the plants that has been reported to have various therapeutic functions,including antioxidant,antimicrobial,anticancer,anti-inflammatory,and *** study aimed to identify the bioactive compounds and evaluate the antidiabetic and cytotoxic potential of *** fruit aqueous crude *** *** fruit extract demonstrated promising inhibitory potential against theα-amylase andα-glucosidase enzymes with halfmaximal inhibitory concentration(IC50)of 211±0.74μg/ml and 963±0.85μg/ml,*** the IC50 cytotoxicity concentrations of *** extract on L6 cells for 24 h,48 h,and 72 h,are 0.96±0.11 mg/ml,0.63±0.5 mg/ml and 0.45±0.3 mg/ml,*** was noted that the IC50 forα-glucosidase inhibition was higher than the IC50 of L6 cells cytotoxicity for 48 h,and 72 h,however the extract still proved to be viable to help in managing diabetes at lower concentration since there are other properties in the extract that can potentially help in targeting other diabetic therapeutic candidates,such asα-***,through LCMS chromatographic analysis,a library of 62 chemical constituents was *** were put up for further pharmacological screening and molecular docking analyses,and we short-listed 18 potent antidiabetic bioactive ***,molecular dynamics(MD)simulation was performed,which showed stable ligand-protein *** conclusion,the findings of this research demonstrated that *** fruit extract could be an excellent source of bioactive compounds with promising antidiabetic potential.

关键词： Garcinia atroviridis Fruit extract Antidiabetic Cytotoxicity Molecular docking Molecular dynamics simulation

统计学笔记:相对差异百分比、对称性和自然对数

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英国医学杂志中文版 2022年第12期25卷 729-731页

作者： Tim j Cole douglas G Altman 李戈(译) 刘欣月(译) 孙凤(校) Population Policy and Practice ProgrammeGreat Ormond Street Institute of Child HealthUniversity College LondonLondon WC1N 1EHUK Centre for Statistics in Medicine Nuffield Department of OrthopaedicsRheumatology and Musculoskeletal SciencesUniversity of OxfordOxford OX37LDUK 天津中医药大学健康科学与工程学院北京大学公共卫生学院流行病与卫生统计学系

对数变换具有非常实用的性质,因此在统计学中被广泛应用,但是即便是统计学家对其属性也知之甚少,而非统计学家则感觉其很不友好。对数变换两种常见形式为:以10为底的普通对数(lg)和以e作底的自然对数(ln)。以自然对数为例,解释如下:任... 详细信息

对数变换具有非常实用的性质,因此在统计学中被广泛应用,但是即便是统计学家对其属性也知之甚少,而非统计学家则感觉其很不友好。对数变换两种常见形式为:以10为底的普通对数(lg)和以e作底的自然对数(ln)。以自然对数为例,解释如下:任意两个数字a、b,其对数差ln(a)-ln(b),实际上反映的是二者比值大小。在此结果上乘以100,100xln(a)-100xln(b),即为α、b基于对数变换的相对差异百分比。

关键词：对数变换自然对数统计学家常见形式对称性百分比

Is iron overload in alcohol-related cirrhosis mediated by hepcidin?

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World journal of Gastroenterology 2009年第46期15卷 5864-5866页

作者： Tariq Iqbal Azzam Diab douglas G Ward Matthew j Brookes Chris Tselepis jim Murray Elwyn Elias Department of Gastroenterology University Hospital BirminghamVincent Drive Depart ment of Cancer Studies University of BirminghamVincent Drive Department of Hematology University Hospital BirminghamVincent Drive

In this case report we describe the relationship between ferritin levels and hepcidin in a patient with alcohol-related spur cell anemia who underwent liver *** demonstrate a reciprocal relation-ship between serum or urinary hepcidin and serum ferritin,which indicates that inadequate hepcidin production by the diseased liver is associated with elevated serum *** ferritin level falls with increasing hepcidin production after *** inflammatory indices(IL6)nor erythropoietin appear to be related to hepcidin expression in this *** suggest that inappropriately low hepcidin production by the cirrhotic liver may contribute substantially to elevated tissue iron stores in cirrhosis and speculate that hepcidin replacement in these patients may be of therapeutic benefi t in the future.

关键词： Alcohol Iron Anaemia Hepcidin Cirrhosis

Further recommendations for trauma training of Indian medical officers and medical students

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World journal of Emergency Medicine 2011年第2期2卷 85-87页

作者： Robert j.douglas Tonia M Mezzini GAnand Kumar Andrew jA Giles Sportsmed Sa 32 Payneham Road Stepney South Australia 5069 Clinic 275 Royal Adelaide Hospital Adelade South Australia 5000 Vinayaka Missions Kirubananda Variyar Medical College Hospital Salem Tamil Nadu India Emergency Department Royal Adelaide Hospital Adelaide South Australia 5000

In a recent article,1 we have demonstrated a significant difference in the theoretical knowledge of both junior and senior emergency department （ED） medical officers （M0s） from Salem, Tamil Nadu, India, and the Royal Adelaide Hospital （RAH） Adelaide, South Australia, in the management of severely injured trauma patients, when comparing M0s who had completed an ATLS-type program with those who had not undertaken such a program.

关键词： Further recommendations trauma training of Indian medical

城市环境中共享(街道街道)空间概念演变综述

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城市交通 2015年第3期13卷 76-94页

作者： Auttapone Karndacharuk douglas j.Wilson Roger Dunn 魏贺刘斌奥克兰交通局道路通道运营部新西兰奥克兰1142pb92250 奥克兰大学市政与环境工程学院新西兰奥克兰1142pb92019 北京市城市规划设计研究院北京100045

通过综述城市设计与交通工程学科文献,从新西兰视角明确共享空间概念的起源和演变。综述过程包括研究公众期望变化背景下的公共道路空间的功能与使用以及如何与一些相互关联的街道设计方法(如交通稳静化和自适应道路)联系起来。这些方... 详细信息

通过综述城市设计与交通工程学科文献,从新西兰视角明确共享空间概念的起源和演变。综述过程包括研究公众期望变化背景下的公共道路空间的功能与使用以及如何与一些相互关联的街道设计方法(如交通稳静化和自适应道路)联系起来。这些方法从机动车时代初期就被用于最小化机动车影响。应用于城市活动中心的公共道路环境中的共享空间概念,正逐渐被城市规划师、交通工程师和管理部门所接受。共享空间不同于传统道路,它鼓励通过少量物理隔离使全体道路使用者合理地使用同一道路空间。为了以安全有效的方式实现共享空间,在设计上需要通过促进步行与骑行活动来降低机动车主导性,同时应将道路空间作为场所来利用而非仅仅出于其机动性与可达性目的。基于交通稳静化街道与共享空间在基础概念上的差异,认为共享空间由一些设计要素组成,若缺少这些要素,公共街道将难以对全体道路使用者发挥其真正的共享空间功能。

关键词：共享(街道)空间街道设计使用者融合交通稳静化