检索结果-南通市图书馆

REE characteristics and genesis of alkaline-rich porphyry, Yunnan Province

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2001年第1期8卷 45-49页

作者： LAI jian qing,wu Cheng jian,peng Sheng lin (Institute of Geology, Central South University, Changsha 410083, China) 1. Institute of Geology Central South University 410083 Changsha China

The Yunnan Himalayan alkaline rich porphyry occurs as a compound rockbelt and consists of calca alkalic, alkaline and peralkaline intrusions. Its origin is in debate. The paper deals with its origin by studying rock′s REE and Sr isotope. Although the rocks are different in their REE contents varying from 77.53 μg/g to 1 798.3 μg/g, they have very similar features in REE parameters. On the triangalar diagram of REEs, the sample dots are concentrated on the end area of light REEs, representing a product of low degree melting of upper mantle or lower crust materials. The initial 87 Sr/ 86 Sr values of rocks vary between 0.706 4 and 0.709 8, showing a feature of mantle crust mixed source. Moreover, REEs show a logarithmic linear positive correlation between them. This type of correlation strongly supports the fractional partial melting model. The result of geochemistry inversion shows that the source rock of alkaline rich porphyry is plagioclase bearing harzburgite and of mantle crust mixed type. At the early state of melting, some crust components of the source rock were partially melted into intermediate acidic magma; with the crust components consumed, the magma evolved to basic.

关键词： alkaline rich porphyry REE genesis Sr isotope Yunnan

Comparison of patients by family history with gastric and non-gastric cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第21期15卷 2644-2650页

作者： Xue-Fu Zhou Yu-Long He wu Song jian-Jun peng Chang-Hua Zhang Wen Li Hui wu Department of Gastrointestinal Surgery The First Affiliated Hospital Sun Yat-Sen University Guangzhou 510080 Guangdong Province China

AIM:To compare the gastric cancer(GC) patients by their family history with gastric and ***:Positive family histories within seconddegree relatives and clinicopathological features were obtained for 256 ***:Of the 256 probands,112(76 male,36 female) were incorporated into familial GC(FGC) group:at least two GC members;144(98 male,46 female) were included in the non-FGC group(relatives only affected with non-GCs).Of 399 tumors in relatives(181 from FGC against 212 from non-FGC),GC was the most frequent,followed by esophageal,hepatocellular,and colorectal *** cancer was next to lung cancer but prior to breast and urogenital *** affected members aggregated within first-degree relatives(FGC:66 siblings,48 fathers,31 mothers,four offspring;non-FGC:56 fathers,55 siblings,43 mothers,and 15 offspring).The ratio of males to females in affected first-degree relatives was usually higher in male *** history of GC was a slight risk for GC in males(OR = 1.19,95% CI:0.53-2.69),while risk of GC by maternal history of non-GCs was increased in females(OR = 0.46,95% CI:0.22-0.97).Diffuse-GC was the major histological type in all *** in tumor sites between thetwo groups was derived from an excess of upper sites in non-FGC female ***:Distribution of associated non-GCs in a family history of GC may vary with geographic *** may have different genetic and/or environmental etiology in different families,and a certain subtype may be inherited in a female-influenced fashion.

关键词： Gastric cancer Family history Familialgastric cancer Familial predisposition Female-influencedfashion

Westward Migration of Tropical Cyclone Activity in the Western North Pacific during 1982–2020:Features and Possible Causes

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

Journal of Meteorological Research 2024年第1期38卷 1-9页

作者： jian ZHONG Huadong DU Yuqin wu Yuehua peng China Satellite Maritime Tracking and Control Department Jiangyin 2144312 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 4100733 Dalian Naval Academy Dalian 1160184 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029

The westward migration of tropical cyclone(TC)activity has been identified in the western North Pacific(WNP),but the related features and causes remain ***,based on the best track data from China,Japan,and the US,and the NCEP–NCAR reanalysis data in 1982–2020,we investigate characteristics of the westward migration of the WNP TC activity with various metrics,and reveal possible causes for the migration of TC tracks through analyzing its seasonality and dependence on environmental *** results show that the WNP TCs show significant westward migrations in a number of metrics,including location of tracks,genesis,the first track point at which TC reaches its lifetime-maximum intensity,and the last track point in the TC *** is found that TC tracks exhibit more significant westward migrations in the easterly steering flow than in the westerly steering ***,the TC longitude shift shows notable seasonal variations,for which the TCs in the easterlies move further west than those in the westerlies during July–September,vice versa during October–*** dependence of the westward migration of TC tracks on background steering flow is associated with the different environmental *** westward shift in the westerly steering is mainly due to the reduced vertical wind shear(VWS),while the weakened zonal easterly steering and reduced VWS are both closely related to the westward migration in the easterly *** results have important implications for understanding current and future variations in TC longitude shift.

关键词： tropical cyclone westward migration steering flow vertical wind shear

Experimental investigation on using CO_(2)/H_(2)O emulsion with high water cut in enhanced oil recovery

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 974-986页

作者： Xi-Dao wu peng Xiao Bei Liu Guang-Jin Chen jian-Hua Pang State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Ocean Intelligence Technology Center Shenzhen Institute of Guangdong Ocean UniversityShenzhen518120GuangdongChina

CO_(2) emulsions used for EOR have received a lot of interest because of its good performance on CO_(2)mobility ***,most of them have been focusing on the high quality CO_(2) emulsion(high CO_(2) fraction),while CO_(2) emulsion with high water cut has been rarely *** this paper,we carried out a comprehensive experimental study of using high water cut CO_(2)/H_(2)O emulsion for enhancing oil ***,a nonionic surfactant,alkyl glycosides(APG),was selected to stabilize CO_(2)/H_(2)O emulsion,and the corresponding morphology and stability were evaluated with a transparent PVT ***,plugging capacity and apparent viscosity of CO_(2)/H_(2)O emulsion were measured systematically by a sand pack displacement apparatus connected with a 1.95-m long capillary ***,a high water cut(40 vol%) CO_(2)/H_(2)O emulsion was selected for flooding experiments in a long sand pack and a core sample,and the oil recovery,the rate of oil recovery,and the pressure gradients were *** results indicated that APG had a good performance on emulsifying and stabilizing CO_(2) *** inversion from H_(2)O/CO_(2) emulsion to CO_(2)/H_(2)O emulsion with the increase in water cut was ***_(2)/H_(2)O emulsions with lower water cuts presented higher apparent viscosity,while the optimal plugging capacity of CO_(2)/H_(2)O emulsion occurred at a certain water ***,the displacement using CO_(2)/H_(2)O emulsion provided 18.98% and 13.36% additional oil recovery than that using pure CO_(2) in long sand pack and core tests,*** work may provide guidelines for EOR using CO_(2) emulsions with high water cut.

关键词： CO_(2)/H_(2)O emulsion High water cut CO_(2) mobility control Enhanced oil recovery

在线全文

学校读者我要写书评

暂无评论

仙桃市水稻全生育期病虫害绿色防控技术初探

湖北植保 2024年第3期 66-69,76页

作者：陈军张晓瑞吴建鹏张瑶刘松杰乔志刚仙桃市植物保护局湖北仙桃433000 仙桃市农业综合执法支队湖北仙桃433000 仙桃市农业科学研究所湖北仙桃433000

2023年,仙桃市开展了水稻全生育期病虫害绿色防控示范。结果表明,应用交配干扰技术对第4代稻纵卷叶螟、二化螟的防效分别为92.2%、90.5%,优于农户自防区91.3%、74.6%的防效;全程应用生物农药对稻飞虱的防效为93.3%,优于农户自防区86.6%... 详细信息

2023年,仙桃市开展了水稻全生育期病虫害绿色防控示范。结果表明,应用交配干扰技术对第4代稻纵卷叶螟、二化螟的防效分别为92.2%、90.5%,优于农户自防区91.3%、74.6%的防效;全程应用生物农药对稻飞虱的防效为93.3%,优于农户自防区86.6%的防效,对纹枯病、稻曲病、稻瘟病的防效分别为82.8%、93.5%、84.8%,略低于农户自防区的防效;绿色防控示范区水稻产量为688 kg/667m^(2),高于农户自防区的632 kg/667m^(2),比空白对照增产44.2%;绿色防控示范区较常规化学防治区减少化学农药使用量87.3%。

关键词：水稻全生育期病虫害绿色防控

维普期刊数据库博看期刊

MiR-107-3p/Atp6v0e1 contributes to protective effects of two selenium-containing peptides,TSeMMM and SeMDPGQQ on lead-induced neurotoxicity

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第4期13卷 2060-2067页

作者： Yong Fang Tianhang Huang jian wu Xieqi Luo Fengjiao Fan peng Li jian Ding Xinyang Sun College of Food Science and Engineering Nanjing University of Finance and Economics/Collaborative Innovation Center for Modern Grain Circulation and SafetyNanjing 210023China Laboratory of Neurodegenerative and Neuroinjury Diseases Wuxi School of MedicineJiangnan UniversityWuxi 214122China

Two selenium(Se)-containing peptides from Se-enriched rice,TSeMMM and SeMDPGQQ,possess neuroprotective potency against lead(Pb2+)-induced ***,the crosstalk between mRNA and microRNAs(miRNA)involved in the neuroprotection mechanism remains to be *** this study,RNA-sequencing and miRNA-sequencing were used to independently identify differentially expressed mRNAs and small RNAs profiles in Pb^(2+)-treated primary fetal rat cortical neurons and then the correlated miRNA-mRNA target pairs were *** was found that 34 mRNAs related to oxidative phosphorylation could be reversed by pretreatment of TSeMMM and *** protective effect of TSeMMM and SeMDPGQQ was mediated by upregulation of miR-107-3p,which downregulates the ATPase H+transporting V0 subunit e1(Atp6v0e1)mRNA level.A zebrafish model was applied to verify the relevance between the targeted mRNA and miRNA by real-time quantitative *** results indicated that miR-107-3p was a potential therapeutic target to achieve neuroprotection of Se-containing peptides via stimulation of Atp6v0e1.

关键词： Lead Se-containing peptides Neuroprotection miRNA

Multicolored Bipartite Ramsey Numbers of Large Cycles

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第2期40卷 347-357页

作者： Shao-qiang LIU Yue-jian peng College of Mathematics and Statistics Hanshan Normal UniversityChaozhou 521041China School of Mathematics Hunan UniversityChangsha 410082China

For an integer r≥2 and bipartite graphs Hi,where 1≤i≤r,the bipartite Ramsey number br(H1,H2,…,Hr)is the minimum integer N such that any r-edge coloring of the complete bipartite graph KN;N contains a monochromatic subgraph isomorphic to Hi in color i for some 1≤i≤*** show that if r≥3;α1,α2>0,αj+2≥[(j+2)!-1]Σi=1^(j+1)α1 for j=1,2…r-2,then br(C2[α1n],C2[α2n],…,C2[αrn]=(Σ=j=1^(r)a j+o(1))n.

关键词： ramsey number bipartite ramsey number regularity lemma

Resource Allocation to Minimize the Makespan with Multi-Resource Operations

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第5期37卷 2054-2070页

作者： WENG wuyan CHU Chengbin wu peng School of Economics and Management Fuzhou UniversityFuzhou 350108China Univ Gustave Eiffel ESIEE Paris&COSYS-GRETTIAF-77454 Marne-la-ValléeFrance

This paper investigates a new resource-allocation problem involving multi-resource operations,where completing an operation requires simultaneous use of multiple(renewable)resources,probably of different *** goal of the study is to provide a solution method that minimizes the *** authors formulate the problem into a novel mixed-integer linear program(MILP)*** efficiently solve practical-sized instances,an exact Benders decomposition algorithm is *** algorithm divides the original problem into a master problem of allocating resources and a subproblem of calculating the makespan,and both are linked via Benders *** convergence is sped up by improving the mathematical model and embedding the variable neighborhood search *** with CPLEX,a commonly used MILP solver,the computational results demonstrate that the proposed algorithm provides tighter upper and lower bounds in most *** particular,compared with CPLEX,the proposed method can on average improve the upper and lower bounds by 4.76%and 4.39%,respectively,in solving practical-sized instances.

关键词： Benders decomposition multi-resources operations resource allocation

L vector spaces and L fields

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2024年第10期67卷 2195-2216页

作者： Yinhe peng Liuzhen wu Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China

We construct in ZFC(the Zermelo-Fraenkel system with choice) an L topological vector space—a topological vector space that is an L space—and an L field—a topological field that is an L space. This generalizes earli... 详细信息

关键词： minimal walk topological vector space topological eld L space L vector space L eld