检索结果-南通市图书馆

Zircon U-Pb-Hf and trace element signatures reveal the petrogenesis of the Jiuyishan granitic complex， South China: Implications for W-Sn and rare metal mineralization

引用

Journal of Earth Science 2024年

作者： Wenzhou Xiao Chaoyun Liu Kaixuan Tan Xianzhe Duan Qinglin Sui Kaituo Shi Peng Feng mabrouk sami Quan Ou Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes， School of Resource Environment and Safety Engineering， University of South China Fundamental Science on Radioactive Geology and Exploration Technology Laboratory， East China University of Technology Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring， Ministry of Education， School of Geosciences and Info-Physics， Central South University Geology Department， Faculty of Science， Minia University State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Institute of Sedimentary Geology， Chengdu University of Technology

The Jiuyishan granitic complex， located in the Nanling Range， South China， is composed of five granitic plutons （Xuehuading， Jinjiling， Pangxiemu， Shaziling and Xishan）. Zircon U-Pb dating of four plutons （Jinjiling， Pangxiemu， Shaziling and Xishan） yielded similar ages of approximately 153 Ma， indicating indistinguishable ages within error. Three plutons except the Shaziling pluton， have consistent εNd（t）（-7.8 to -5.8） and εHf（t）（-9.1 to -2.2） values， which are similar to those of the lower crustal granulitic metasedimentary and meta-igneous rocks in South China. Comparing to other three plutons， the Shaziling pluton has consistent εHf（t）（-7.4 to -6.8） and εHf（t）（-7.5 to -4.7） values and shows similar source， but the Shaziling mafic microgranular enclaves （MMEs） show variable εHf（t）（-14.2 to 4.8） values， indicating a remarkable mantle magma injection of the Shaziling pluton. Zircon Ce/Sm-Yb/Gd， whole-rock CaO-P2O5and CaO-TiO2linear trends revealed that from the Xishan to the Shaziling and from the Jinjiling to the Pangxiemu granites， they experienced apatite and titanite fractionation， respectively. Zircon Th， U， Nb， Ta， Hf， Ti， Y， P and rare earth element （REE） contents and whole-rock Sr， Ba and Rb contents also show that the Shazling， Xishan， Jinjiling and Pangxiemu granites followed a discontinuous evolutionary series， but the Pangxiemu granites exhibit highly evolved nature. Four main controlling factors of W-Sn and rare metal mineralization in granitic rocks were discussed， and we found that the mineralization in Jiuyishan granitic complex was mainly controlled by the fractionation degree and crystallization temperature， but were rarely affected by oxygen fugacity and mantle material input. The Pangxiemu granites show particularly higher Rb and Ta contents than the other three plutons， implying that the ore deposits developed in the Jiuyishan complex were directly related to the most evolved Pangxiemu pluton， with the occurrence of Rb and Ta as the most l

关键词：

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

Role of Magmatism and Related-Exsolved Fluids during Ta-Nb-Sn Concentration in the Central Eastern Desert of Egypt:Evidences from Mineral Chemistry and Fluid Inclusions

引用

Journal of Earth Science 2023年第3期34卷 674-689页

作者： Mohamed Abd El Monsef mabrouk sami Fatma Toksoy‐Köksal Rainer Abart Martin Ondrejka Khaled MAbdelfadil Geology Department Faculty of ScienceTanta University31527 TantaEgypt Geology Department Faculty of ScienceMinia University61519 El-MiniaEgypt Department of Geological Engineering Middle East Technical University06800 AnkaraTurkey Department of Lithospheric Research University of Vienna1090 ViennaAustria Department of Mineralogy Petrology and Economic GeologyComenius UniversityBratislavaSlovakia Department of Geology Faculty of ScienceSohag University82524 SohagEgypt Department of Physics and Earth Sciences Jacobs University28759 BremenGermany

The rare metals of Abu Dabbab area in the Central Eastern Desert of Egypt have been investigated for their mineralogy and conditions of precipitation using combination of EMPA and fluid inclusions studies,in order to delineate the source,mechanism of formation and evolutionary model for these economic ***(Ta-Nb-Sn)-bearing minerals at the Abu Dabbab area include columbite group minerals(CGMs),wodginite and *** both granitic intrusion and its enclosed quartz veins,most of zoned CGMs and cassiterite grains are commonly characterized by a well-developed twostage ***,columbite-(Mn)(CGM-Ⅰ)represents the early formed phase of CGMs that is characterized by high Mn#values(0.64-0.92)with quite low Ta#values(0.13-0.49).It was invaded by Ta-rich phases including tantalite-(Mn)(CGM-Ⅱ;Ta#=0.13-0.49)and wodginite,which contain high Ta_(2)O_(5)and SnO_(2)(17.91 wt.%).In regard to cassiterite,there are distinct compositional differences between the early-phase cassiterite(Cst-Ⅰ)and the late-phase one(Cst-Ⅱ),where the latter is enriched in Ta_(2)O_(5),Nb_(2)O_(5)and *** chemistry and textural criteria of the early stage CGM-Ⅰand Cst-Ⅰ,all are indicative of magmatic ***,the latter CGM-Ⅱ,wodginite and Cst-Ⅱwere influenced by the late magmatic Ta-rich *** inclusions microthermometry shows criteria of phase separation represented by both boiling and fluid *** initial fluid was supposed to be of magmatic origin(magmatic CH4),that was consequently influenced by fluid mixing/dilution with post-hydrothermal/meteoric water with respect to the decompression process during *** construction gave rise to an estimate P-T conditions(T=330-370℃,P=22-50 MPa).The fluid inclusions’microthermometry supports a transition between magmatic and late to post-hydrothermal activities in addition to surface-derived fluid(meteoric fluid?)in a part as main source for the polymetallic deposits.

关键词： columbite-group minerals wodginite cassiterite magmatic-hydrothermal fluid inclusion deposits Abu Dabbab

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

Origin and Petrogenetic Implications of Spessartine Garnet in Highly-Fractionated Granite from the Central Eastern Desert of Egypt

引用

Acta Geologica Sinica(English Edition) 2020年第3期94卷 763-776页

作者： mabrouk sami Theodoros NTAFLOS Haroun A.MOHAMED Esam S.FARAHAT Christoph HAUZENBERGER Nasser M.MAHDY Khaled M.ABDELFADIL Douaa FATHY Geology Department Faculty of ScienceMinia UniversityEl-Minia 61519Egypt Department of Lithospheric Research University of ViennaAlthanstrasse 14A-1090 ViennaAustria Institute of Mineralogy and Petrology Karl-Franzens UniversityGrazAustria Nuclear Materials Authority P.O.530El-MaadiCairoEgypt Geology Department Faculty of ScienceSohag UniversityEgypt

A highly-fractionated garnet-bearing muscovite granite represents the marginal granitic facies of the Abu-Diab multiphase pluton in the Central Eastern Desert of Egypt. New electron microprobe analyses(EMPA) and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS) data from garnets are reported, in order to constrain their origin and genesis. Garnet in the Abu-Diab host granite is euhedral to subhedral, generally homogeneous and, in rare cases, it shows weak zonation. The garnet contains appreciable amounts of MnO and FeO, with lesser amounts of MgO and CaO, yielding an end-member formula of Sps61–72Alm25–35Prp1–4Adr0–1. Moreover, it is depleted in large ion lithophile elements(LILE) with lower values of Ba, Nb and Sr relative to the primitive mantle. Additionally, it contains high concentrations of HREE and Y and their REE pattern shows strong negative Eu anomalies. The garnet was crystallized under relatively low temperature(646°C–591°C) and pressure(< 3 kbar) conditions. The textural and chemical features indicate that the garnet is magmatic in origin and is chemically similar to that from highly-fractionated A-type granite. It was probably formed at the expense of biotite in a highly-evolved MnO-rich magma and/or by hydroxyl complexing of Mn during the ascending fluid phases.

关键词： spessartine garnet LA-ICP-MS A-type granite Abu-Diab Egypt

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

Petrography and Geochemistry of Baïbokoum-Touboro-Ngaoundaye Granitoids on the Chad-Cameroon-RCA Borders (Adamawa-Yade Domain)

引用

Open Journal of Geology 2022年第2期12卷 136-155页

作者： Naïmou Seguem Mbaguedjé Diondoh Amadou Diguim Kepnamou Ntoumbé Mama mabrouk sami Ganwa Alembert Alexandre Ekodeck Georges Emmanuel Department of Geology Faculty of Sciences and Techniques University Adam Barka of Abeche Abeche Chad Department of Mines and Geology School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Department of Geology Faculty of Sciences Minia University El-Minia Egypt Department of Earth Sciences Faculty of Sciences University of Ngaoundere Ngaoundere Cameroon Department of Earth Sciences Faculty of Sciences University of Yaounde I Yaounde Cameroon

The Baïbokoum-Touboro-Ngaoundaye area is located in the Adamoua-Yade domain of the Pan-African Fold Belt in Central Africa. The present work concerns the petrographic and geochemical study. The study area is made up of plutonic rocks including two amphibole granites, four biotite and muscovite granites, two syenites and one monzonite sample. These rocks have a granular porphyroid texture, with a mylonitic tendency. The primary paragenesis consists of Opx + Cpx + Amp + Bt + Pl + Or + Mic + Qtz + Ap + Sph + Zr and the secondary paragenesis consisting of Ch + Op. Plutonic rocks are shoshonitic to calc-alkaline with a strong potassic affinity. The REE profiles of these rocks show a negative anomaly of Eu in the granites and no Eu anomaly in syenites and monzonite (syeno-diorite). Multielement spectra of plutonic rocks present a negative anomaly in Nb-Ta and Ti. Fractional crystallization is the process that made these rocks of study area. These rocks are placed in a subduction to syn-collisional (VAG + Syn-COLG) and of intraplate granitoids (WPG) environment.

关键词： Petrography Geochemistry Baïbokoum-Touboro-Ngaoundaye Adamawa-Yade Domain Pan-African Fold Belt

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

Topology reduction through machine learning to accelerate dynamic simulation of district heating

引用

Energy and AI 2024年第3期17卷 247-260页

作者： Dubon Rodrigue Mohamed Tahar mabrouk Bastien Pasdeloup Patrick Meyer Bruno Lacarrière IMT Atlantique GEPEAUMR CNRS 61444 rue Alfred KastlerNantesF-44307France IMT Atlantique Lab-STICCUMR CNRS 6285655 Av.du TechnopoleBrestF-29238France

District heating networks (DHNs) provide an efficient heat distribution solution in urban areas, accomplished through interconnected and insulated pipes linking local heat sources to local consumers. This efficiency is further enhanced by the capacity of these networks to integrate renewable heat sources and thermal storage systems. However, integration of these systems adds complexity to the physical dynamics of the network, necessitating complex dynamic simulation models. These dynamic physical simulations are computationally expensive, limiting their adoption, particularly in large-scale networks. To address this challenge, we propose a methodology utilizing Artificial Neural Networks (ANNs) to reduce the computational time associated with the DHNs dynamic simulations. Our approach consists in replacing predefined clusters of substations within the DHNs with trained surrogate ANNs models, effectively transforming these clusters into single nodes. This creates a hybrid simulation framework combining the predictions of the ANNs models with the accurate physical simulations of remaining substation nodes and pipes. We evaluate different architectures of Artificial Neural Network on diverse clusters from four synthetic DHNs with realistic heating demands. Results demonstrate that ANNs effectively learn cluster dynamics irrespective of topology or heating demand levels. Through our experiments, we achieved a 27% reduction in simulation time by replacing 39% of consumer nodes while maintaining acceptable accuracy in preserving the generated heat powers by sources.

关键词： District heating network Topology reduction Artificial neural networks Hybrid modeling Graph based formulation

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

Mechanisms underlying the role of endoplasmic reticulum stress in the placental injury and fetal growth restriction in an ovine gestation model

引用

Journal of Animal Science and Biotechnology 2024年第1期15卷 201-217页

作者： Hao Zhang Xia Zha Yi Zheng Xiaoyun Liu mabrouk Elsabagh Hongrong Wang Honghua Jiang Mengzhi Wang Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition College of Animal Science and TechnologyYangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture and Agri‑Product Safety Ministry of Education of ChinaYangzhou UniversityYangzhou 225009P.R.China Department of Animal Production and Technology Faculty of Agricultural Sciences and TechnologiesNiğde Omer Halisdemir UniversityNigde 51240Turkey Department of Nutrition and Clinical Nutrition Faculty of Veterinary MedicineKafrelsheikh UniversityKafrelSheikhEgypt Department of Pediatrics Northern Jiangsu People’s HospitalClinical Medical CollegeYangzhou UniversityYangzhou 225001China State Key Laboratory of Sheep Genetic Improvement and Healthy Production Xinjiang Academy of Agricultural Reclamation ScienceShihezi 832000China

Background Exposure to bisphenol A(BPA),an environmental pollutant known for its endocrine-disrupting properties,during gestation has been reported to increase the risk of fetal growth restriction(FGR)in an ovine model of *** hypothesized that the FGR results from the BPA-induced insufficiency and barrier dysfunction of the placenta,oxidative stress,inflammatory responses,autophagy and endoplasmic reticulum stress(ERS).However,precise mechanisms underlying the BPA-induced placental dysfunction,and subsequently,FGR,as well as the potential involvement of placental ERS in these complications,remain to be *** In vivo experiment,16 twin-pregnant(from d 40 to 130 of gestation)Hu ewes were randomly distributed into two groups(8 ewes each).One group served as a control and received corn oil once a day,whereas the other group received BPA(5 mg/kg/d as a subcutaneous injection).In vitro study,ovine trophoblast cells(OTCs)were exposed to 4 treatments,6 replicates *** OTCs were treated with 400μmol/L BPA,400μmol/L BPA+0.5μg/m L tunicamycin(Tm;ERS activator),400μmol/L BPA+1μmol/L 4-phenyl butyric acid(4-PBA;ERS antagonist)and DMEM/F12 complete medium(control),for 24 *** In vivo experiments,pregnant Hu ewes receiving the BPA from 40 to 130 days of pregnancy experienced a decrease in placental efficiency,progesterone(P4)level and fetal weight,and an increase in placental estrogen(E2)level,together with barrier dysfunctions,OS,inflammatory responses,autophagy and ERS in type A *** vitro experiment,the OTCs exposed to BPA for 24 h showed an increase in the E2 level and related protein and gene expressions of autophagy,ERS,pro-apoptosis and inflammatory response,and a decrease in the P4 level and the related protein and gene expressions of antioxidant,anti-apoptosis and barrier ***,treating the OTCs with Tm aggravated BPA-induced dysfunction of barrier and endocrine(the increased E2 level and decreased P4 level),OS,inflamm

关键词： Autophagy Bisphenol A Endoplasmic reticulum stress Fetal growth restriction Inflammatory responses Sheep

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

Stabilization of fractional bilinear systems with multiple inputs

引用

Applied Mathematics(A Journal of Chinese Universities) 2023年第1期38卷 78-88页

作者： Thouraya Kharrat Fehmi mabrouk Fawzi Omri Department of Mathematics Faculty of Sciences of SfaxUniversity of SfaxTunisia

In this paper,we study in a constructive way the stabilization problem of fractional bilinear systems with multiple *** the quadratic Lyapunov functions and some additional hypotheses on the unit sphere,we construct stabilizing feedback laws for the considered fractional bilinear system.A numerical example is given to illustrate the efficiency of the obtained result.

关键词： stabilization fractional system bilinear system multiple inputs Lyapunov functions

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

Reduction of vibration by periodically stitched sandwich panel

引用

Chinese Journal of Aeronautics 2021年第7期34卷 39-49页

作者： Nan LI mabrouk BEN TAHAR Liang MENG Fusheng SUI Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China Sorbonne Universites Universitede Technologie de CompiegneCNRSUMR 7337 RobervalCentre de Recherche RoyallieuCS 60319Compiegne Cedex 60203France State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

This work reveals that the addition of periodically distributed stitches to sandwich structure enables a significant reduction of vibration in stop-band and this new functionality is systematically ***,a finite element model which is capable of taking into consideration the three layers of the sandwich as well as the stitches is *** diagram of dispersion is calculated by applying Floquet-Bloch theorem to the boundaries of unit *** properly chosen properties of stitches,a stop-band for flexural wave is *** stop-band is further confirmed by the forced response of a large stitched sandwich panel under point *** level of vibration in the stop-band is significantly *** influence of the stitch rigidity and density on upper and lower limits of stop-band is also examined,which confirms that stitched sandwich can be tuned to mitigate vibration in a certain frequency band with appropriate stitch *** investigations have demonstrated the potential application of stitched sandwich in the area of vibration reduction.

关键词： Composite structure Parametric study Periodic structures Reduction of vibration Stitched sandwich

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

Mechanical and Metallurgical Characterization of HSLA X70Welded Pipeline Steel Subjected to Successive Repairs

引用

Acta Metallurgica Sinica(English Letters) 2016年第6期29卷 568-576页

作者： Bouzid Maamache mabrouk Bouabdallah Abdelhalim Brahimi Youcef Yahmi Billel Cheniti Brahim Mehdi Research Center in Industrial Technologies(CRTI) P.O.Box 6416014 CheragaAlgeria Laboratoire des Aeronefs Universite de Blidal09000 BlidaAlgeria LGSDS Ecole Nationale PolytechniqueEl Harrach16200AlgiersAlgeria LTSM Universite de Blidal09000 BlidaAlgeria ICMMO/SP2M Bat 410Universite Paris-Sud 1191405Orsay CedexFrance

The aim of this work is to study the influence of successive weld repairs on the microstructure and the mechanical behavior of the heat-affected zone（HAZ） of an HSLA X70 steel. Detailed microstructural examination combined to grain size measurement showed that beyond the second weld repair, the microstructure of the HAZ undergoes significant change in the grain morphology and grain growth. The results of the X-ray diffraction analyzed using MAUD software indicated an increase in the crystallite size and a decrease in the dislocation density according to the number of weld repair operations. Consequently, a loss of mechanical properties, namely the yield strength and the toughness with the number of weld repairs, was recorded. Beyond the second weld repair operation, the properties of the welded joint do not fulfill the standards applied in piping industry.

关键词： HSLA X70 steel Successive weld repair Heat affected zone Dislocation density

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

Electrochemical behavior and analytical detection of Imidacloprid insecticide on a BDD electrode using square-wave voltammetric method

引用

Chinese Chemical Letters 2016年第5期27卷 666-672页

作者： mabrouk Ben Brahim Hafedh Belhadj Ammar Ridha Abdelhedi Youssef Samet Electrochemistry and Environmental Laboratory Department of Materials Engineering National Engineering School of Sfax University of Sfax B.P. I 1733038 Sfax Tunisia

A sensitive square-wave voltammetric method for the determination of lmidacloprid （IMD） was developed using electrochemically pretreated boron-doped diamond （BDD） electrode. Aqueous solutions were prepared with Confidor 200 SL as the commercial formulation of IMD. Sodium sulfate （Na2SO4） was used as supporting electrolyte. The influence of operating parameters, such as the pH of the medium, frequency, pulse amplitude, scan increment and the concentration of IMD was investigated. An irreversible cathodic peak, corresponding to the reduction oflMD is observed at 1.21 V （vs. SCE） and the electrode reaction was controlled by adsorption. Under optimized conditions, the square-wave reduction peak current was linear over the concentration range of （30-200 μmol L 1） with a detection and quantification limits of 8.60 μmol L 1 and 28.67 μmol L 1, respectively. The results were compared with spectrophotometry and HPLC methods under some conditions and found to be in good agreement. To investigate applicability to real samples, the proposed method was applied to the determination of IMD in plum juice.

关键词： Imidacloprid Square-wave volammetry Boron-doped diamond electrode Electrochemical detection

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：