检索结果-南通市图书馆

The boring billion? - Lid tectonics, continental growth and environmental change associated with the Columbia supercontinent

引用

Geoscience Frontiers 2013年第6期4卷 681-691页

作者： Nick m.W.Roberts NERC Isotope Geosciences Laboratory British Geological SurveyKeyworthNottingham NG12 5GGUK

The evolution of Earth＇s biosphere,atmosphere and hydrosphere is tied to the formation of continental crust and its subsequent movements on tectonic *** supercontinent cycle posits that the continental crust is periodically amalgamated into a single landmass,subsequently breaking up and dispersing into various continental *** is possibly the first true supercontinent,it amalgamated during the 2.0-1.7 Ga period,and collisional orogenesis resulting from its formation peaked at 1.95-1.85 *** and palaeomagnetic evidence indicate that Columbia remained as a quasi-integral continental lid until at least 1.3 *** break-up attempts are evidenced by dyke swarms with a large temporal and spatial range; however,palaeomagnetic and geologic evidence suggest these attempts remained *** than dispersing into continental fragments,the Columbia supercontinent underwent only minor modifications to form the next supercontinent （Rodinia） at 1.1 -0.9 Ga; these included the transformation of external accretionary belts into the internal Grenville and equivalent collisional *** Columbia provides evidence for a form of ‘lid tectonics’,modern style plate tectonics occurred on its periphery in the form of accretionary *** detrital zircon and preserved geological record are compatible with an increase in the volume of continental crust during Columbia＇s lifespan; this is a consequence of the continuous accretionary processes along its *** quiescence in plate tectonic movements during Columbia＇s lifespan is correlative with a long period of stability in Earth＇s atmospheric and oceanic *** variability starting at 1.3 Ga in the environmental record coincides with the transformation of Columbia to Rodinia; thus,the link between plate tectonics and environmental change is strengthened with this interpretation of supercontinent history.

关键词： Rodinia Columbia Supercontinents Continental growth Lid tectonics mesoproterozoic

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

The heritage of world civilizations=世界文明遗产 Albert m. Craig ... [et al.]. 7th ed.

引用

2006年

作者： Albert m. Craig ... [et al.].

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

ENTROPY FUNCTIONAL FOR CONTINUOUS SYSTEmS OF FINITE ENTROPY

引用

Acta mathematica Scientia 2012年第2期32卷 775-782页

作者： m.Rahimi A.Riazi Department of mathematics Amirkabir University of TechnologyTehranIran

In this article, we introduce the concept of entropy functional for continuous systems on compact metric spaces, and prove some of its properties. We also extract the Kolmogorov entropy from the entropy functional.

关键词： Entropy entropy functional invaxiant

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

Soil Contamination due to E-Waste Disposal and Recycling Activities: A Review with Special Focus on China

引用

Pedosphere 2012年第4期22卷 434-455页

作者： m. O. SImONNOT Laboratoire Réactions et Génie des Procédés (LRGP) Université de Lorraine-CNRS (UPR 3349) 1 Rue Grandville BP20451 54001 Nancy Cedex (France)

This paper presents a review of soil contamination resulting from e-waste recycling activities, with a special focus on China, where many data have been collected for a decade. Soils in the e-waste areas are often contaminated by heavy metals and organic compounds, mainly polycyclic aromatic hydrocarbons (PAHs), polybrominated diphenyl ethers (PBDEs), polychlorinated and polybrominated biphenyls (PCBs and PBBs), dechlorane plus (DP), hexabromocyclododecanes (HBCDs), polychlorinated and polybrominated dibenzo- p-dioxins (PCDDs and PBDDs), and polychlorinated and polybrominated dibenzofurans (PCDFs and PBDFs), while other compounds, not systematically monitored, can be found as well. Pollutants are generally present in mixtures, so pollution situations are complex and diversified with a gradient of contamination from agricultural soils to hot spots at e-waste sites and mainly in open burning areas. It has been proved that pollutants were transferred to the food chain via rice in China, and that the population was threatened since high levels of various pollutants were detected in blood, placentas, hair, etc., of residents of e-waste sites. Eventually, soil remediation techniques are reviewed. Although there are many available techniques devoted to heavy metals and persistent organic pollutants, the current techniques for the e-waste sites, where these contaminants coexist, are very sparse. Phytoremediation has been investigated and co-cropping appears as a promising approach for the slightly contaminated agricultural soils. In some cases, different remediation techniques should be combined or trained, while the influence of coexisting contaminants and the removal sequence of contaminants should be considered. In hot spots, physical and chemical techniques should be used to reduce high pollution levels to prevent further pollutant dissemination. This review highlights the urgent needs for 1) characterization of pollution status in all the countries where e-wastes are r

关键词： co-cropping heavy metals organic compounds pollution remediation

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

Synthesis and Spectroscopic Characterizations of New mercury(Ⅱ), Cerium(Ⅲ), and Thorium(Ⅳ) Captopril Drug Complexes

引用

光谱学与光谱分析 2020年第11期40卷 3649-3652页

作者： Samy m.El-megharbel moamen S.Refat Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Faculty of ScienceZagazig UniversityZagazigEgypt Department of Chemistry Faculty of SciencePort Said UniversityPort SaidEgypt

In this article, three types of metal ions with different oxidation state as mercury(Ⅱ), cerium(Ⅲ) thorium(Ⅳ) have been reacted with captopril drug(CAP). The isolated solid complexes were explained using elemental analysis, conductance measurements, infrared and 1H-NmR spectroscopy as well as the thermo gravimetric(TG/DTG) analysis. The micro analytical and spectroscopic results for all CAP complexes were agreement with the speculated structures. The stoichiometry for divalent Hg^2+, trivalent Ce^3+ and tetravalent Th(4+) metal ions with CAP ligand was established with 1∶2(m(n+):CAP) molar ratio. The qualitative analysis showed that in case of the mercury(Ⅱ) complex, the chloride ions didn't involved in the complexity, suggesting formula [Hg(CAP)2] in neutral form. However, regarding both Ce(Ⅲ) and Th(Ⅳ) complexes as [Ce(CAP)2(NO3)]·3 H2O and [Th(CAP)2(NO3)2(H2O)]·3 H2O formulas, the nitrate group is existed inside the coordination sphere. The infrared analysis data proved that CAP drug act as a bidentate ligand with the metal ions of Ce(Ⅲ) and Th(Ⅳ) through oxygen carbonyl group C=O and oxygen of the deprotonated carboxylic COOH group, while for the Hg(Ⅱ) complex, the CAP acts as a bidentate ligand through oxygen of C=O group and sulfur atom of the deprotonated -SH group. Thorium(Ⅵ) complex has a nine-coordinate geometry, while Hg(Ⅱ) and Ce(Ⅲ) have a four and six-coordination behaviors respectively. The 1H-NmR data of the CAP compound has a singlet sharp signal at 1.90 ppm due to the proton of -SH group, this peak absent in the spectrum of the Hg(Ⅱ) CAP complex upon the deprotonated of thiol group.

关键词： Captopril drug metal ions FTIR 1H-NmR

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

Dark Energy models and Cosmic Acceleration with Anisotropic Universe in f(T) Gravity

引用

Communications in Theoretical Physics 2014年第4期61卷 482-490页

作者： m.Sharif Sehrish Azeem Department of mathematics University of the PunjabQuaid-e-Azam Campus

This paper is devoted to studing the accelerated expansion of the universe in context of f(T) theory of gravity. For this purpose, we construct different f(T) models and investigate their cosmological behavior through equation of state parameter by using holographic, new agegraphic and their power-law entropy corrected dark energy models. We discuss the graphical behavior of this parameter versus redshift for particular values of constant parameters in Bianchi type I universe model. It is shown that the universe lies in different forms of dark energy, namely quintessence,phantom, and quintom corresponding to the chosen scale factors, which depend upon the constant parameters of the models.

关键词：宇宙加速膨胀能量模型各向异性重力参数方程宇宙模型比例因子宇宙学

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

On the Controllability of an Advection-diffusion Equation with Respect to the Diffusion Parameter:Asymptotic Analysis and Numerical Simulations

引用

Acta mathematicae Applicatae Sinica 2019年第1期35卷 54-110页

作者： Youcef AmIRAT Arnaud mNCH Laboratoire de mathématiques Blaise Pascal Université Clermont Auvergne UMR CNRS 6620 Campus universitaire des Cézeaux

The advection-diffusion equation y_t~ε-εy_(xx)~ε+ m y_x~ε= 0,(x, t) ∈(0, 1) ×(0, T) is null controllable for any strictly positive values of the diffusion coefficient ε and of the controllability time T. We discuss here the behavior of the cost of control when the coefficient ε goes to zero, according to the values of T. It is actually known that this cost is uniformly bounded with respect to ε if T is greater than a minimal time T_m, with T_m in the interval [1, 2×3^(1/2)]/m for m > 0 and in the interval [2×2^(1/2), 2(1 +3^(1/2))]/|m | for m m is however *** investigate in this work the determination of the minimal time T_m employing two distincts but complementary approaches. In a first one, we numerically estimate the cost of controllability, reformulated as the solution of a generalized eigenvalue problem for the underlying control operator, with respect to the parameter T and ε. This allows notably to exhibit the structure of initial data leading to large costs of control. At the practical level, this evaluation requires the non trivial and challenging approximation of null controls for the advection-diffusion equation. In the second approach, we perform an asymptotic analysis, with respect to the parameter ε, of the optimality system associated to the control of minimal L^2-norm. The matched asymptotic expansion method is used to describe the multiple boundary layers.

关键词： numerical approximation space-time variational formulation asymptotic analysis boundary layers null controllability

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

Ready to migrate?Reading cellular signs of migration in an epithelial to mesenchymal transition model

引用

BIOCELL 2022年第11期46卷 2353-2356页

作者： TAmARA FERNÁNDEZ-CALERO IGNACIO LÓPEZ mARCOS DAVYT CORA CHALAR RICARDO EHRLICH mÓNICA mARÍN Biochemistry-molecular Biology Faculty of ScienceUniversidad de la RepúblicaMontevideo11400Uruguay Bioinformatics Unit Institut Pasteur de MontevideoMontevideo11400Uruguay Departamento de Ciencias Exactas y Naturales Universidad Católica del UruguayMontevideo11600Uruguay Institut Pasteur de montevideo Montevideo11400Uruguay

The epithelial to mesenchymal transition(EmT)is a cellular program that drives de-differentiation of cells in both physiological and pathological *** of the characteristics of cells describing an EmT is the(re)acquisition of a motility capacity that allows them to migrate through the original tissue as well as to other sites in the *** molecular mechanisms that control the EmT are rapidly emerging and here we add to the idea that the adaptation required for cells to commit to the EmT includes adjustments of the translation machinery and metabolic pathways to cope with a high demand of extracellular components.

关键词： EmT migration Translation machinery metabolism

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

C-type lectin receptor-induced NF-κB activation in innate immune and inflammatory responses

引用

Cellular & molecular Immunology 2012年第2期9卷 105-112页

作者： Lara m Kingeter Xin Lin Department of molecular and Cellular Oncology The University of TexasM.D.Anderson Cancer CenterHoustonTXUSA Cancer Biology Program The University of TexasGraduate School of Biomedical SciencesHoustonTXUSA

The C-type lectin receptors （CLRs） belong to a large family of proteins that contain a carbohydrate recognition domain （CRD） and calcium binding sites on their extracellular domains. Recent studies indicate that many CLRs, such as Dectin-1, Dectin-2 and mincle, function as pattern recognition receptors （PRRs） recognizing carbohydrate ligands from infected microorganisms. Upon ligand binding, these CLRs induce multiple signal transduction cascades through their own immunoreceptor tyrosine-based activation motifs （ITAms） or interacting with ITAm-containing adaptor proteins such as FcRy. Emerging evidence indicate that CLR-induced signaling cascades lead to the activation of nuclear factor kappaB （NF-KB） family of transcriptional factors through a Syk- and CARD9-dependent pathway（s）. The activation of NF-κB plays a critical role in the induction of innate immune and inflammatory responses following microbial infection and tissue damages. In this review, we will summarize the recent progress on the signal transduction pathways induced by CLRs. and how these CLRs activate NF-κB and contribute to innate immune and inflammatory responses.

关键词： C-type lectin receptor innate immunity NF-κB

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

PmmA-doped CdSe quantum dots as saturable absorber in a Q-switched all-fiber laser

引用

Chinese Optics Letters 2016年第8期14卷 67-71页

作者： m.B.Hisyam m.F.Rusdi A.A.Latiff S.W.Harun Department of Electrical Engineering Faculty of Engineering University of Malaya Photonics Research Center University of Malaya

We demonstrate the generation of Q-switched pulses from an ytterbium-doped fiber laser（YDFL） using quantum dot（QD） CdSe as a passive saturable absorber（SA）. The CdSe QD is fabricated by the synthesis of CdO,Se, and manganese acetate and paraffin oil and oleic acid as the solvent and surfactant, respectively. The CdSe QD is then doped into poly-methyl-methacrylate（PmmA） via an emulsion polymerization process. A PmmAhosted CdSe QD thin flake with a homogeneous end surface is then formed and placed between two ferrules and assembled in a YDFL cavity to achieve the Q-switching operation with a repetition rate of 24.45 to 40.50 kHz while varying the pump power from 975 to 1196 mW. The pulse width changes from 6.78 to 3.65 μs with a maximum calculated pulse energy at 0.77 μJ at a pump power of 1101 mW. This work may be the first demonstration of CdSe QD-based Q-switching in an all-fiber configuration that should give proportional insight into semiconductor QD materials in photonics applications.

关键词： switched CdSe absorber repetition methacrylate photonics polymerization surfactant oleic demonstration

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

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：