检索结果-南通市图书馆

Heating, ventilating, and air conditioning analysis and design Faye C. McQuiston, Jerald d. parker, Jeffrey d. Spitler. 5th ed.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Heating, ventilating, and air conditioning analysis and desi...

Exchange-Correlation Functional Comparison of Electronic Energies in Atoms Using a Grid Basis

2000年

作者： Faye C. McQuiston Jerald d. parker Jeffrey d. Spitler.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2022年第11期10卷 3392-3407页

作者： Anthony d. Ryan Andres Gama Frank Felerski William d. parker department of Mathematics and Physics University of Wisconsin-Parkside Kenosha WI USA

Calculation of total energies of the electronic ground states of atoms forms the basis for the frozen-core pseudopotentials used in atomistic calculations of much larger scale. Reference values for these energies provide a benchmark for the validation of new software to calculate such potentials. In addition, basic atomic-scale electronic properties such as the (first) ionization energy provide a simple check on the approximation used in the calculation method. We present a comparison of the total energies and ionization energies of atoms Z = 1 - 92 calculated in density functional theory with several levels of exchange-correlation functional and the Hartree-Fock method, comparing ionization energies to experiment. We also investigate the role of relativistic treatment on these energies.

关键词： density Functional Theory Hartree-Fock Theory Electronic Energies Exchange-Correlation Potential Exchange and Correlation Functional Ionization Energy

Assessment of the uncertainties in temperature change in China during the last century

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 Science Bulletin 2010年第19期55卷 1974-1982页

作者： LI QingXiang dONG WenJie LI Wei GAO XiaoRong JONES P KENNEdY J parker d National Meteorological Information Center Beijing 100081 China Beijing Normal University Laboratory of Surface Process and Resources Economies Beijing 100875 China National Meteorological Center Beijing 100081 China Climatic Research Unit School of Environmental Sciences University of East Anglia Norwich NR4 7TJ UK Met Office Hadley Centre Exeter EX1 3PB UK

We have used the China Homogenized Historic Temperature dataset and some long-term station series of the neighbor countries from CRUTEM3,a 5°×5° gridded dataset of monthly mean temperature since 1900,to provide a 107-year record of surface temperature trends and *** derived a comprehensive set of uncertainty estimates to accompany the data:measurement and sampling errors,uncertainties in temperature bias estimates,and uncertainties arising from limited observational coverage on large-scale averages have all been *** reanalysed the temperature changes during the period of *** best estimates of trends for 1900-2006 with uncertainties at 95% confidence range are about 0.09±0.017°C/decade for the year as a whole,and 0.14±0.021°C/decade,0.11±0.021°C/decade,0.04±0.017°C/decade,and 0.07±0.017°C/decade for winter,spring,summer and autumn *** 1954-2006,the trends for annual,winter,spring,summer and autumn are:0.26±0.032°C/decade,0.35±0.046°C/decade,0.25±0.051°C/decade,0.16±0.037°C/decade and 0.22±0.055°C/*** saw the most significant warming trend in both 1900-2006 and 1954-2006,while during the most recent period(the satellite era,1979-2006),all the seasons show similar warming trends:0.45±0.13°C/decade,0.51±0.11°C/decade,0.52±0.16°C/decade,0.37±0.10°C/decade and 0.50±0.16°C/decade for annual,winter,spring,summer and *** arising from urbanization have been evaluated as less than 5% of the total warming trend for 1951-2001,so this bias was not removed.

关键词：不确定性温度变化中国历史评估变暖趋势偏差估计月平均温度抽样误差

New Astrophysical Reaction Rates for ^18F（P,α）^15O and ^18F（P,γ）^19Ne

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

Chinese Physics Letters 2003年第9期20卷 1470-1473页

作者：舒能川 d.W.Bardayan J.C.Blackmon 陈永寿 R.L.Kozub P.d.parker M.S.Smith ChinaInstituteofAtomicEnergy Beijing102413 Physicsdivision OakRidgeNationalLaboratoryOakRidgeTennessee37831USA Physicsdepartment TennesseeTechnologicalUniversityCookevilleTennessee38505USA A.W.WrightNuclearStructureLaboratory YaleUniversityNewHavenConnecticut06520USA

The rates of the thermonuclear 18F(p, α)15O and 18F(p,γ)19Ne reactions in hot astrophysical environments are needed to understand gamma-ray emission from nova explosions. The rates for these reactions have been uncertain due to discrepancies in recent measurements, as well as to a lack of a comprehensive examination of the available structure information in the compound nucleus 19Ne. We have examined the latest experimental measurements with radioactive and stable beams, and made estimates of the unmeasured 19Ne nuclear level parameters, to generate new rates with uncertainties for these reactions. The rates are expressed as numerical values over the temperature range relevant for stellar explosions, as well as analytical expressions as functions of temperature in a format suitable for use in astrophysical simulations. Comparisons with the previous rate calculations are carried out, and the astrophysical implications are briefly discussed.

关键词： Gamma rays

Metabolite profile comparisons between ascending and descending colon tissue in healthy adults

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第3期26卷 335-352页

作者： Bridget A Baxter Kristopher d parker Michael J Nosler Sangeeta Rao Rebecca Craig Catherine Seiler Elizabeth P Ryan department of Environmental and Radiological Health Sciences Colorado State UniversityFort CollinsFort CollinsCO 80523United States University of Colorado Health Gastroenterology Clinic Fort CollinsCO 80524United States department of Clinical Sciences Colorado State UniversityFort CollinsCO 80523United States Harmony Surgery Center Fort CollinsCO 80528United States director of Clinical Operations Harmony Surgery CenterFort CollinsCO 80523United States

BACKGROUNd Obesity is a risk factor for colorectal cancer,yet metabolic distinctions between healthy right and left colon tissue,before cancer is diagnosed,remains largely *** study compared right-ascending and left-descending colon tissue metabolomes to identify differences from the stool metabolome in normal weight,overweight,and obese *** To examine right and left colon tissue metabolites according to body mass index that may serve as mechanistic targets for interventions and biomarkers for colon cancer *** Global,non-targeted metabolomics was applied to assess right-ascending and left-descending colon tissue collected from healthy adults undergoing screening colonoscopies to test the hypothesis that BMI differentially impacts colon tissue metabolite *** colon tissue and stool metabolome of healthy adults(n=24)was analyzed for metabolite signatures and metabolic pathway networks implicated in progression of colorectal *** Ascending and descending colon contained 504 host,food,and microbiotaderived metabolites from normal weight,overweight and obese adults grouped according to body mass *** acids,lipids,and nucleotides were among the chemical types that further differentiated from the stool metabolite *** weight adults had 46 significantly different metabolites between ascending and descending colon tissue locations,whereas there were 37 metabolite differences in overweight and 28 metabolite differences for obese adults(Pdults had trimethylamine N-oxide,endocannabinoids and monoacylglycerols with different relative abundances identified between ascending and descending *** and secondary bile acids,vitamins,and fatty acids also showed marked relative abundance differences in colon tissue from overweight/obese *** There were metabolite profile differences between right-ascending and leftdescending colon tissue in healthy *** lipids and other metabolites in

关键词： Colon Ascending descending Metabolomics Obesity Stool

Relating environmental variables with aquatic community structure in an agricultural/urban coldwater stream

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2021年第1期10卷 481-499页

作者： daniel T.L.Myers Richard R.Rediske James N.McNair Aaron d.parker E.Wendy Ogilvie Annis Water Resources Institute Grand Valley State University740 W Shoreline DriveMuskegonMI 49401USA. Michigan department of Environment Great Lakesand Energy525 W Allegan StreetLansingMI 48909USA. Grand Valley Metropolitan Council 678 Front Avenue NWSuite 200Grand RapidsMI 49504USA.

Background:Urban areas are often built along large rivers and surrounded by agricultural *** may lead to small tributary streams that have agricultural headwaters and urbanized lower *** study objectives assessed are as follows:(1)landscape,geomorphic,and water quality variables that best explained variation in aquatic communities and their integrity in a stream system following this agricultural-to-urban land use gradient;(2)ways this land use gradient caused aquatic communities to differ from what would be expected for an idealized natural stream or other longitudinal gradients;and(3)whether the impacts of this land use gradient on aquatic communities would grow larger in a downstream direction through the agricultural and urban *** study area was an impaired coldwater stream in Michigan,***:Many factors structured the biological communities along the agricultural-to-urban land use *** woody debris had the strongest relationship with EPT(Ephemeroptera,Plecoptera,and Trichoptera)abundance and richness and were most common in the lower,urbanized *** streambed substrate had the strongest relationship with diptera taxa and surface air breather macroinvertebrates and was dominant in agricultural *** community assemblage was influenced largely by stream flow and temperature regimes,while poor fish community integrity in lower urban reaches could be impacted by geomorphology and episodic urban pollution *** macroinvertebrates were most abundant in deforested,first-order agricultural headwaters,while EPT macroinvertebrate richness was the highest downstream of agricultural areas within the urban zone that had extensive forest ***:Environmental variables and aquatic communities would often not conform with what we would expect from an idealized natural *** richness improved downstream of agricultural *** shows promise for the recovery of aquatic systems using we

关键词： Land use Habitat Stream Fish Macroinvertebrate Gradient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

GIS的“系统”

国外测绘 1994年第3期 32-36,42页

作者： parker,d 赵波

单个ＧＩＳ软件包很难满足某一用户的所有要求，通常要有几个软件包才能满足用户需要由于用户期望不断增加，越来越多的机构需要一个适应范围较大的ＧＩＳ分析软件包，空间数据采集和其它方面必须要考虑数据的瘘容性和数据和长期可用性... 详细信息

单个ＧＩＳ软件包很难满足某一用户的所有要求，通常要有几个软件包才能满足用户需要由于用户期望不断增加，越来越多的机构需要一个适应范围较大的ＧＩＳ分析软件包，空间数据采集和其它方面必须要考虑数据的瘘容性和数据和长期可用性，用使用户可以从各种分析软件中获盗，目前已有一些可以使用的系统。本文描述建立一个适应于所有数据并独立于任何一种应用软件的地理信息系统的方法这种方法允许在不同应用软件包间交换数据。

关键词：地理信息系统软件数据结构

pysky: An Application for the Planning of Multi-Target Astronomical Observations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2021年第11期9卷 2765-2775页

作者： Allen E. Rocha William d. parker department of Mathematics and Physics University of Wisconsin-Parkside Kenosha USA

To automate the process of planning and curating multi-target observation sessions, pysky application builds on the astroplan Python package to identify visible objects during an observation window and produce relevant information about those objects in visual and graphical form. The package calculates object visibility based on a provided time window and observing location as well as maximum airmass and limiting magnitude requested by the user. The pysky application images of the target objects with identifying and astrometric data to provide context for the images. In addition, pysky creates polar plots of each object’s horizontal coordinates, and the images and plots are designed to be shown side-by-side. The package also generates an HTML table of the selected target objects with their related data to relay the entire target list as one. The pysky application draws on a variety of Python packages to collect and process data from databases such as JPL Horizons and SIMBAd. Results for a test event were verified by hand using database web interfaces. The pysky application provides a platform for further integration of automated observation planning with websites and apps to enhance multi-target observation sessions.

关键词： Observational Astronomy Observatories Astronomy Software

ACTION研究:第一个使用长效二氢吡啶类钙通道阻断剂治疗冠心病/稳定型心绞痛的临床研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（心脏病学分册） 2005年第4期1卷 7-9页

作者： John d.parker 多伦多大学

曾经有一些观点认为钙通道阻断剂会对冠心病产生负面的影响……现在这种观点被ACTION研究彻底埋葬了。

关键词：稳定型心绞痛 ACTION 硝苯地平控释片钙通道阻断剂拜新同高血压研究全因死亡地尔硫长期安全性冠状动脉造影