检索结果-南通市图书馆

中国8种暖温带木本植物展叶及开花始期数据集(1963–2015)

在线全文

学校读者我要写书评

暂无评论

全球变化数据学报（中英文） 2019年第4期3卷 326-335,433-442页

作者：戴君虎朱梦瑶王焕炯陶泽兴胡植董晓宇中国科学院地理科学与资源研究所中国科学院陆地表层格局与模拟重点实验室北京100101 中国科学院大学北京100049 长安大学地球科学与资源学院西安710054

植物物候是评估全球变化影响,研究生态系统结构和功能以及发展气候和陆面模式的重要基础。本文提取中国物候观测网1963–2015年白蜡、垂柳、刺槐、合欢、桑树、榆树、杏树和紫荆等8种木本植物的展叶始期和开花始期数据,通过Unified、Uni... 详细信息

植物物候是评估全球变化影响,研究生态系统结构和功能以及发展气候和陆面模式的重要基础。本文提取中国物候观测网1963–2015年白蜡、垂柳、刺槐、合欢、桑树、榆树、杏树和紫荆等8种木本植物的展叶始期和开花始期数据,通过Unified、UniChill和时空耦合三种物候模型构建、相应参数值估计和模型检验的春季物候格网数据研发方法,研发了过去50年上述物种在其分布区展叶始期和开花始期的0.5°×0.5°格网数据。数据验证结果表明展叶始期的平均模拟误差约为5–9天,开花始期平均误差约为5–12天。本数据集的组成包括:(1)头文件,包括物种物候期和分布范围格网的头文件信息;(2)物种物候期,包括每个物种展叶始期和开花始期1963–2015年的逐年文件;(3)物种分布范围,包括每个物种的实际分布范围格网。数据集由3个数据文件夹共计1,713个数据文件组成,数据存储为.txt,GEOTIFF和ArcGIS ASCII格式,数据量为74.5 MB(压缩后为8.84 MB)。

关键词：暖温带木本植物春季物候展叶始期开花始期

Revisiting the gravity laws of inter-city mobility in megacity regions

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2023年第2期66卷 271-281页

作者： Pengjun ZhAO haoyu hU Liangen ZENG jun ChEN Xinyue YE College of Urban and Environmental Sciences Peking UniversityBeijing100871China School of Urban Planning and Design Peking University Shenzhen Graduate SchoolShenzhen518055China Laboratory for Laboratory for Earth Surface System and human-Earth Relations Ministry of Natural Resources of ChinaPeking University Shenzhen Graduate SchoolShenzhen518055China National Geomatics Center of China Beijing100048China Department of Landscape Architecture and Urban Planning Texas A&M UniversityCollege StationTX77843USA

Inter-city mobility is one of the most important issues in the UN Sustainable Development Goals,as it is essential to access the regional labour market,goods and services,and to constrain the spread of infectious *** the gravity model has been proved to be an effective model to describe mobility among settlements,knowledge is still insufficient in regions where dozens of megacities interact closely and over 100 million people *** addition,the existing knowledge is limited to overall population mobility,while the difference in inter-city travel with different purposes is unexplored on such a large geographic *** revisited the gravity laws of inter-city mobility using the 2.12 billion trip chains recorded by 40.48 million mobile phone users’trajectories in the jing-jin-ji Region,which contains China’s capital ***,unlike previous studies,we found that non-commuting rather than commuting is the dominant type of inter-city mobility(89.3%).Noncommuting travellers have a travel distance 42.3%longer than commuting ***,we developed more accurate gravity models for the spatial distribution of inter-city commuting and non-commuting *** also found that inter-city mobility has a hierarchical structure,as the distribution of inter-city travel volume follows Zipf’s *** particular,the hierarchy of non-commuting travel volume among the cities is more in line with an ideal Zipf distribution than commuting *** findings contribute to new knowledge on basic inter-city mobility laws,and they have significant applications for regional policies on human mobility.

关键词： Mobility Inter-city Travel behaviour Megacity region Zipf’s law China

Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第10期29卷 186-194页

作者： S Rosales N Casillas A Topete O Cervantes G González j A Paz M E Cano Centro Universitario de Ciencias Exactas e Ingenienas Universidad de GuadalajaraBlvd.Marcelino Garcia Burragan 1421C.P.44430GuadalajaraJaliscoMexico Centro Universitario de la Cienegu Universidad de GuadalajaraAv.Universidad 1115C.P.47820OcotlanJaliscoMexico Centro Universitario de Ciencias de In Salud Universidad de Guadalajara.Sierra Mojada 950C.P.44340GuadalajaraJaliscoMexico

The physical characterization of a colloidal system of superficially modified magnetic nanoparticles (MNPs) is presented. The system consists of oleic acid-coated iron oxide nanoparticles (OAMNP) suspended in water. A structural analysis is carried out by using standard physical techniques to determine the diameter and shape of the MNPs and also the width of the coating shell. The colloidal stability and the polydispersity index of this ferrofluid are determined by using Zeta potential measurements. Additionally, the magnetic characterization is conducted by obtaining the DC magnetization loops, and the blocking temperatures are determined according to the ZFC–FC protocol. Finally, the values of power absorption density P of the ferrofluid are estimated by using a magneto-calorimetric procedure in a wide range of magnetic field amplitude h and frequency f. The experimental results exhibit spherical-like shape of OAMNP with (20 ± 4) nm in diameter. Due to the use of coating process, the parameters of the magnetization loops and the blocking temperatures are significantly modified. hence, while the uncoated MNPs show a blocking state of the magnetization, the OAMNP are superparamagnetic above room temperature (300 K). Furthermore, the reached dependence P versus f and P versus h of the ferrofluid with coated MNPs are clearly fitted to linear and quadratic correlations, respectively, showing their accordance with the linear response theory.

关键词： nanoparticles ferrofluid magnetic hyperthermia functionalization

低浓度甲苯在固定床活性炭上的吸附及其数值模拟

在线全文

学校读者我要写书评

暂无评论

化工环保 1999年第5期19卷 259-263页

作者：宁平陈亚雄李柳琼谷俊杰 h.j.Bart 王安忠昆明理工大学昆明650093 Kaiserlautern大学

对气体中低浓度甲苯在固定床活性炭上的吸附作了系统研究，测定了甲苯空气活性炭系统的吸附等温线及３６０×１４００ｍｍ活性炭固定床的穿透曲线，并在低浓度范围建立了固定床活性炭吸附甲苯的数学模型。计算结果与实验结果吻... 详细信息

对气体中低浓度甲苯在固定床活性炭上的吸附作了系统研究，测定了甲苯空气活性炭系统的吸附等温线及３６０×１４００ｍｍ活性炭固定床的穿透曲线，并在低浓度范围建立了固定床活性炭吸附甲苯的数学模型。计算结果与实验结果吻合良好。

关键词：甲苯活性炭吸附固定床数学模型废气处理

在线全文

学校读者我要写书评

暂无评论

深孔分段法采场矿石储量和品位的计算方法

矿业工程 1984年第11期 5-7页

作者： j.h.赖特刘维震美国采矿工程师协会会员格兰德贾克兴公司采矿顾问

对于深孔分段采矿法中采场内的矿石,生产部门的地质师只能间接地进行观察。因此,预测这样一个采场内的矿石品位和储量便成为一大难题。然而,深孔本身提供的试样数据可用以提高这些预测。本文讨论的加权试样数据的径向分布计算法,对预测... 详细信息

对于深孔分段采矿法中采场内的矿石,生产部门的地质师只能间接地进行观察。因此,预测这样一个采场内的矿石品位和储量便成为一大难题。然而,深孔本身提供的试样数据可用以提高这些预测。本文讨论的加权试样数据的径向分布计算法,对预测某些深孔分段采矿法中采场内的矿石品位和储量是很有用处的。

关键词：加权平均值分段采矿法广义算术平均值矿石储量深孔施瓦兹沃尔德品位采场计算方法分段法空场法

Local immunotherapy with interleuk in-2 delivered from biodegradable p olymer microspheres combined with interstitial chemotherapy:a novel treatme nt for experimental malignant glioma

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

癌症 2003年第7期22卷 752-752页

作者： Rhines LD DiMeco F Lawson hC Tyler BM hanes j Olivi A Brem h

OBjECTIVE:Local delivery of carmustine(BCNU)from biodegradable polymers prolon gs survival against experimental brain ***,paracrine administration of inte rleukin-2(IL-2)has been shown to elicit a potent antitumor immune response and to improve survival in animal brain tumor *** r eport the use of a novel polymeric mic rosphere delivery vehicle to release *** demonstr ate both in vitro release of cytokine from the microspheres and histological evidence of the inflammatory response elicited by I L-2released from the microspheres i n the rat *** microspheres a re used to deliver IL-2,and biodegradable polymer wafers are used to deliver BCNU,directly at the site of an intracranially implanted glioma in the *** two agents administered locally show a s ynergistic ***:Fischer 344rats challenged intracranially with 9L gliosarcoma received an intracranial implant of either empty microspheres or microspheres containing IL-2(IL-2MS ).Five days later,animals in each group were randomized to receiv e polymer implants loaded with 0,3.8,or 10%BCNU at the tumor ***:Animals that received the combination of IL-2MS a nd 3.8%BCNU polymer(median survival,28.5d )or IL-2MS and 10%BCNU polymer(median survival,45.5d )showed significantly improved surv ival compared with animals that rece ived monotherapy with IL-2microsph eres(median survival,24d ),3.8%BCNU polymer(median survival,24d ),or 10%BCNU polymer(median survival,32.5d ).Control animals had a median survival of *** combination of either 3.8or 10%BCNU polymer with IL-2MS resulted in 7and 25%long-term survivors,***:By showing synergy of IL-2and BCNU in an animal glioma model and using a reproducible synthetic delivery sy stem for each agent (i.e.,one that did not rely on genetic ally engineered cells or viruses),we hope that the combination of local immunotherapy and chemotherapy can take an important step closer to clinical applic ation in patients with

关键词：实验性神经胶质瘤 IL-2 腔内化疗

Luminosity determination for the pd reaction at 2.14 GeV with WASA-at-COSY

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2012年第7期36卷 605-609页

作者：郑川 M.Büscher P.Fedorets V.h.j.y h.Stroher 徐瑚珊袁小华 Institut für Kernphysik Forschungszentrum Jülich jülich Center for hadron Physics Forschungszentrum Jülich Institute of Modern Physics Chinese Academy of Sciences Institute of Modern Physics Fudan University Institute for Theoretical and Experimental Physics State Scientific Center of the Russian Federation

The luminosity for a WASA-at-COSY experiment involving the pd reaction at 2.14 GeV proton- beam energy is determined by the forward pd elastic scattering, which yields an average beam-on-target value of [5.2±0.3（stat）±0.3（syst）] × 10^30 s^-1 cm^-2. In addition, the forward pd elastic-scattering angular distribution is obtained with four-momentum transfer squared -t between 0.16 （GeV/c）2 and 0.78 （GeV/c）2 at this beam energy, which is compared with other experimental data and the pd double scattering model.

关键词： luminosity pd elastic scattering angular distribution double scattering

hypertonicity:Clinical entities,manifestations and treatment

在线全文

学校读者我要写书评

暂无评论

World journal of Nephrology 2017年第1期6卷 1-13页

作者： helbert Rondon-Berrios Christos Argyropoulos Todd S Ing Dominic S Raj Deepak Malhotra Emmanuel I Agaba Mark Rohrscheib Zeid j Khitan Glen h Murata joseph I Shapiro Antonios h Tzamaloukas Renal-Electrolyte Division Department of MedicineUniversity of Pittsburgh School of MedicinePittsburghPA 15260United States Division of Nephrology Department of MedicineUniversity of New Mexico School of MedicineAlbuquerqueNM 87131United States Department of Medicine Strich School of MedicineLoyola University ChicagoMaywoodIL 60153United States Division of Nephrology Department of MedicineGeorge Washington UniversityWashingtonDC 20037United States Division of Nephrology Department of MedicineSchool of MedicineUniversity of ToledoToledoOH 43614-5809United States Division of Nephrology Department of MedicineJos University Teaching HospitalJosPlateau State 930001Nigeria Division of Nephrology Department of MedicineSchool of MedicineMarshall University Joan C.EdwardsHuntingtonWV 25701United States Informatics Section Medicine ServiceRaymond G.Murphy Veterans Affairs Medical CenterAlbuquerqueNM 78108United States Department of Medicine University of New Mexico School of MedicineAlbuquerqueNM 78108United States Marshall University joan C.Edwards School of Medicine HuntingtonWV 25701United States Section of Nephrology Medicine Service(111C)Raymond G.Murphy Veterans Affairs Medical CenterAlbuquerqueNM 78108United States

hypertonicity causes severe clinical manifestations and is associated with mortality and severe short-term and long-term neurological sequelae. The main clinical syndromes of hypertonicity are hypernatremia and hyperglycemia. hypernatremia results from relative excess of body sodium over body water. Loss of water in excess of intake, gain of sodium salts in excess of losses or a combination of the two are the main mechanisms of hypernatremia. hypernatremia can be hypervolemic, euvolemic or hypo-volemic. The management of hypernatremia addresses both a quantitative replacement of water and, if present, sodium defcit, and correction of the underlying pathophysiologic process that led to hypernatremia. hypertonicity in hyperglycemia has two components, solute gain secondary to glucose accumulation in the extracellular compartment and water loss through hyperglycemic osmotic diuresis in excess of the losses of sodium and potassium. Differentiating between these two components of hypertonicity has major therapeutic implications because the frst component will be reversed simply by normalization of serum glucose concentration while the second component will require hypotonic fuid replacement. An estimate of the magnitude of the relative water deficit secondary to osmotic diuresis is obtainedby the corrected sodium concentration, which representsa calculated value of the serum sodium concentrationthat would result from reduction of the serum glucoseconcentration to a normal level.

关键词： hypertonicity hypernatremia Osmotic diuresis hyperglycemia Water diuresis

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

口蹄疫油佐剂苗现状的评价

中国兽药杂志 1983年第3期 24-27页

作者： P、D、Mckezchez j、h、Graves

长期以来脂类疫苗(Lipovaccines)的研究。包括油佐剂(Oil aoLjuvants)和弗氏佐剂的研究报告很多。但绝大多数与使用口蹄疫疫苗没有关系,法国 Lo Maignac 和 Pinoy 早在1916年将伤寒菌悬液与羊毛脂和液体石蜡油乳化成菌苗。接种试验动物... 详细信息

长期以来脂类疫苗(Lipovaccines)的研究。包括油佐剂(Oil aoLjuvants)和弗氏佐剂的研究报告很多。但绝大多数与使用口蹄疫疫苗没有关系,法国 Lo Maignac 和 Pinoy 早在1916年将伤寒菌悬液与羊毛脂和液体石蜡油乳化成菌苗。接种试验动物,改进了免疫应答反应,几种其他的联合油佐剂研究报告,发表在1935-1943年间,其中有牛的胸膜肺炎和布氏菌的油佐

关键词：油佐剂口蹄疫牲畜五号病病毒病油包水乳剂