检索结果-南通市图书馆

Metamaterial terahertz device with temperature regulation function that can achieve perfect absorption and complete reflection conversion of ultrawideband

引用

Communications in Theoretical Physics 2024年第7期76卷 123-133页

作者： Hao Sun Zao Yi Can Ma Shubo Cheng Bin Tang qingdong zeng Sohail Ahmad School of Mathematics and Science Joint Laboratory for Extreme Conditions Matter PropertiesState Key Laboratory of Environment-Friendly Energy MaterialsTianfu Institute of Research and InnovationSouthwest University of Science and TechnologyMianyang 621010China Department of Oncology Sichuan Science City HospitalMianyangSichuan Province621000China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouHubei 434023China School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China School of Physics and Electronic Information Engineering Hubei Engineering UniversityXiaogan 432000China Institute of Physics Bahauddin Zakariya UniversityMultan 66000Pakistan

The field of terahertz devices is important in terahertz ***,most of the current devices have limited functionality and poor *** improve device performance and achieve multifunctionality,we designed a terahertz device based on a combination of VO_(2)and *** device can be tuned using the phase-transition characteristics of VO_(2),which is included in the triple-layer structure of the device,along with SiO_(2)and *** terahertz device exhibits various advantageous features,including broadband coverage,high absorption capability,dynamic tunability,simple structural design,polarization insensitivity,and incidentangle *** simulation results showed that by controlling the temperature,the terahertz device achieved a thermal modulation range of spectral absorption from 0 to *** 313 K,the device exhibited complete reflection of terahertz *** the temperature increased,the absorption rate also *** the temperature reached 353 K,the device absorption rate exceeded 97.7%in the range of 5-8.55 *** study used the effective medium theory to elucidate the correlation between conductivity and temperature during the phase transition of VO_(2).Simultaneously,the variation in device performance was further elucidated by analyzing and depicting the intensity distribution of the electric field on the device surface at different ***,the impact of various structural parameters on device performance was examined,offering valuable insights and suggestions for selecting suitable parameter values in real-world *** characteristics render the device highly promising for applications in stealth technology,energy harvesting,modulation,and other related fields,thus showcasing its significant potential.

关键词： terahertz perfect absorption complete reflection temperature regulation ultrawideband smart device

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

Genesis of the Jianbeigou Gold Deposit on the Southern Margin of the North China Craton: Insights from Fluid Inclusions, H-O-S Isotopes, and Pyrite in situ Trace Element Analyses

引用

Acta Geologica Sinica(English Edition) 2024年第4期98卷 969-991页

作者： LI Fengchun zeng qingdong ZHU Rixiang CHU Shaoxiong XIE Wei YU Bing WU Jinjian LI Xinghui Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth Science and Engineering Hebei University of EngineeringHandanHebei 056038China

The Jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt, located on the southern margin of the North China Craton. Three stages of the hydrothermal process can be distinguished, including the quartz ± pyrite, quartz-polymetallic sulfide, and quartz-carbonate ± pyrite stages. From the early to late stages, the homogenization temperatures of primary fluid inclusions are 281–362°C, 227–331°C, and 149–261°C, respectively. The corresponding salinities estimated for these fluids are 3.9–9.9 wt%, 0.4–9.4 wt%, and 0.7–7.2 wt% Na Cl equiv. Combined with laser Raman spectroscopy data, the ore-forming fluid belongs to a H_(2)O-CO_(2)-Na Cl ± CH_4 system with medium–low temperature and salinity. The δ~(18)Ofluid and δD values for the quartz veins are-1.0‰ to 6.0‰ and-105‰ to-84‰, respectively, which indicates that the ore-forming fluid is of mixed source, mainly derived from magma, with a contribution from meteoric water. Pyrite has been identified into three generations based on mineral paragenetic sequencing, including Py1, Py2, and Py3. The pyrites have δ~(34)S sulfur isotopic compositions from three stages between 3.7‰ and 8.4‰, indicating that sulfur mainly originated from magma. Te, Bi, Sb, and Cu contents in pyrite were all high and showed a strong correlation with Au concentrations. Native gold and the Au-Ag-Bi telluride minerals were formed concurrently, and the As concentration was low and decoupled from the Au content. Therefore, Te, Bi, Sb and other low-melting point chalcophile elements play an important role for gold mineralization in arsenic-deficient ore-forming fluid. Combined with the geological setting, evolution of pyrite, and ore-fluids geochemistry, we propose that the Jianbeigou deposit can be classified as a magmatic–hydrothermal lode gold deposit. Gold mineralization on the southern margin of the North China Craton is related to Early Cretaceous magmatism and formed in an extensional setting.

关键词： ore genesis H-O-S isotopes fluid inclusions in-situ trace element Jianbeigou gold deposit

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

Multi-functional metasurface:ultra-wideband/multi-band absorption switching by adjusting guided-mode resonance and local surface plasmon resonance effects

引用

Communications in Theoretical Physics 2024年第6期76卷 174-184页

作者： Wenxin Li Shubo Cheng Huafeng Zhang Zao Yi Bin Tang Can Ma Pinghui Wu qingdong zeng Rizwan Raza School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouHubei 434023China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China Department of Oncology Sichuan Science City HospitalMianyangSichuan Province 621000China Office of Science and Technology Quanzhou Normal UniversityQuanzhou 362000China School of Physics and Electronic-information Engineering Hubei Engineering UniversityXiaogan 432000China Department of Physics COMSATS Institute of Information Technology 54000 LahorePakistan

This study introduces an innovative dual-tunable absorption film with the capability to switch between ultra-wideband and narrowband *** manipulating the temperature,the film can achieve multi-band absorption within the 30-45 THz range or ultra-wideband absorption spanning 30-130 THz,with an absorption rate exceeding ***,the structural parameters of the absorption film are optimized using the particle swarm optimization(PSO)algorithm to ensure the optimal absorption *** absorption response of the film is primarily attributed to the coupling of guided-mode resonance and local surface plasmon resonance *** film's symmetric structure enables polarization incoherence and allows for tuning through various means such as doping/voltage,temperature and structural *** the case of a multi-band absorption response,the film exhibits good sensitivity to refractive index changes in multiple absorption ***,the absorption spectrum of the film remains effective even at large incidence angles,making it highly promising for applications in fields such as biosensing and infrared stealth.

关键词： PSO optimization ultra-wideband/narrowband absorption switching intelligent absorption film vanadium dioxide

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 genesis and resource potential of gold deposits in the Liaodong Peninsula

引用

Science China Earth Sciences 2024年第3期67卷 657-672页

作者： Rixiang ZHU Jin-Hui YANG Gongwen WANG qingdong zeng Guoqiang XUE Tao XU Xinghui LI Peng ZHANG Da LEI Guang ZHU State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Shenyang Center China Geological SurveyShenyang 110034China School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China

Plenty of gold deposits related to Late Mesozoic craton destruction are widely distributed in eastern North China Craton. However, significant differences in research degrees, ore-forming characteristics, and proven reserves exist among different regions in the North China Craton. The Liaodong Peninsula has similar regional geological characteristics to those of the Jiaodong Peninsula, with both experiencing craton destruction during Late Mesozoic, but the two areas have substantial differences in terms of gold mineralization and the proven gold resources. Based on regional geology, Mesozoic magmatictectonic evolution and ore geology, combined with integrated geophysical exploration and big data AI resource prediction, in this paper, we propose that the ore-forming materials of Late Mesozoic gold deposits in Liaodong were mainly originated from mantle-derived melts and/or fluids induced by craton destruction. The gold deposits were primarily controlled by NE-NNEtrending faults, mainly classified as fracture-controlled altered rock-type and sulfide-bearing quartz vein-type. Moreover, our study predicts that the Yalu River fault zone and its related secondary faults, as well as the periphery and deeper parts of known goldfields, are the important regions for future gold resource exploration. The Yalu River metallogenic belt has an enormous potential for gold resources, and the Liaodong Peninsula has a potential to add thousands of tons of gold resources.

关键词： Liaodong Peninsula Gold deposit Integrated geophysical exploration Prospecting potential Direction for prospecting breakthroughs

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

A genome-wide association study uncovers that TaPI4K-2A regulates pre-harvest sprouting in wheat

引用

Plant Communications 2024年第5期5卷 1-4页

作者： Li Tai Jianhui Wu Yexing Jing Huaizeng Liu qingdong zeng Xiaojing Xu Shengdixin Shi Hongjin Wang Wenting Liu Jiaqiang Sun De-Jun Han Kun-Ming Chen National Key Laboratory of Crop Improvement for Stress Tolerance and Production College of Life SciencesNorthwest A&F UniversityYangling 712100ShaanxiP.R.China National Key Laboratory of Crop Improvement for Stress Tolerance and Production College of AgronomyNorthwest A&F UniversityYangling 712100ShaanxiP.R.China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081P.R.China National Key Laboratory of Crop Improvement for Stress Tolerance and Production College of Plant ProtectionNorthwest A&F UniversityYangling 712100ShaanxiP.R.China

Dear Editor,Pre-harvest sprouting(PHS)is a major challenge to cereal crop production in areas with frequent rainfall at harvest time and has significant effects on grain yield and end-use quality(Lang et al.,2021).PHS is quantified by the dormancy/germination ratio of seeds and is largely regulated by two opposing phytohormones,abscisic acid(ABA)and gibberellin(GA)(Tai et al.,2021).ABA induces dormancy and suppresses PHS,whereas GA exerts the opposite effects(Finkelstein et al.,2008).Because of the complexity of the genome,only a few genes involved in regulation of PHS have been identified in wheat,and the underlying molecular regulatory mechanisms of PHS remain largely unknown in this species.

关键词： PHS harvest largely

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

张太雷办报实践及其历史贡献

引用

常州工学院学报（社科版） 2024年第1期42卷 20-27页

作者：曾庆栋南宁职业技术学院马克思主义学院广西南宁530008

办报实践是张太雷革命活动的重要组成部分。张太雷以马克思列宁主义为指引,秉持苏俄办报理念,创办《劳报》《来报》,编辑《先驱》《向导》,主编中共广东区委机关报《人民周刊》,为传播马克思列宁主义、宣传中国共产党的革命主张做出了... 详细信息

办报实践是张太雷革命活动的重要组成部分。张太雷以马克思列宁主义为指引,秉持苏俄办报理念,创办《劳报》《来报》,编辑《先驱》《向导》,主编中共广东区委机关报《人民周刊》,为传播马克思列宁主义、宣传中国共产党的革命主张做出了重要历史贡献,形成了报刊要坚持党的领导,要为民众说话、为革命说话,发挥舆论引领作用的宝贵经验,这些经验是中国共产党办报实践的重要组成部分,对做好新时代报刊工作也有着重要启示。

关键词：张太雷办报实践《人民周刊》中共党史

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

Geochemical Variations of the Late Paleozoic Granitoids from the Baolidao Arc-Accrection Belt in Southeastern Segment of Central Asia Orogenic Belt:Implications for Tectonic Transition from Early Carboniferous to Early Permian

引用

Journal of Earth Science 2022年第3期33卷 719-735页

作者： Xueni Zhang qingdong zeng Fengjun Nie School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China

Compositional changes in successively erupted felsic rocks can be used to infer physical changes in lower crustal conditions and to enhance the understanding of the tectonic *** study presents geochronological,geochemical and isotopic data for two I-type granitic plutons in the Sonid Left Banner of the Central Asian Orogenic *** new data,together with compiled I-type granitoid data,reveal the presence of magma compositional transition at~305 Ma in the Baolidao arc-accretion *** early stage granitoids(330-305 Ma)are medium-K calc-alkaline with higher Sr/Y *** late stage granitoids(305-270 Ma)are high-K calc-alkaline with lower Sr/Y *** two-stage granitoids have roughly similar predominately positive Sr-Nd-Hf isotope values,but with a decreasing trend from the early to late *** data indicate that the early stage granitoids were generated by dehydration melting of juvenile mafic crust at amphibole-dominated *** contrast,the late stage granitoids were produced by dehydration melting of a mixed lithology containing juvenile K-rich mafic lower crust and supracrustal materials at the plagioclase-stable crustal *** propose that the compositional transition of these granitoids can be linked with different slab behaviors of the northward subducting Paleo-Asian oceanic plate,and also with the back-arc tectonic settings.

关键词： Central Asian Orogenic Belt Baolidao arc belt I-type granitoids compositional transition geochemical data slab steepening and rollback back-arc closure

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

Geology and Geochemistry of the Bianbianshan Au-Ag-Cu-Pb-Zn Deposit, Southern Da Hinggan Mountains, Northeastern China

引用

Acta Geologica Sinica(English Edition) 2012年第3期86卷 630-639页

作者： zeng qingdong LIU Jianming LIU Hongtao Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The Bianbianshan deposit, the unique gold-polymetal （Au-Ag-Cu-Pb-Zn） veined deposit of the polymetal metallogenic belt of the southern segment of Da Hinggan Mountains mineral province, is located at the southern part of the Hercynian fold belt of the south segment of Da Hinggan Mountains mineral province, NE China. Ores at the Bianbianshan deposit occur within Cretaceous andesite and rhyolite in the form of gold-bearing quartz veins and veinlet groups containing native gold, electrum, pyrite, chalcopyrite, galena and sphalerite. The deposit is hosted by structurally controlled faults associated with intense hydrothermal alteration. The typical alteration assemblage is sericite ＋ chlorite ＋ calcite ＋ quartz, with an inner pyrite-sericite-quartz zone and an outer seicite - chlorite - calcite-epidote zone between orebodies and wall rocks. δ34 S values of 17 sulfides from ores changing from -1.67 to ＋0.49‰ with average of -0.49‰, are similar to δ34 S values of magmatic or igneous sulfide sulfur. 206Pb/204Pb, 207Pb/204Pb and 208Pb/ 204Pb data of sulfide from ores range within 17.66-17.75, 15.50-15.60, and 37.64-38.00, respectively. These sulfur and lead isotope compositions imply that ore-forming materials might mainly originate from deep sources. H and O isotope study of quartz from ore-bearing veins indicate a mixed source of deep-seated magmatic water and shallower meteoric water. The ore formations resulted from a combination of hydrothermal fluid mixing and a structural setting favoring gold-polymetal deposition. Fluid mixing was possibly the key factor resulting in Au-Ag-Cu-Pb-Zn deposition in the deposit. The metallogenesis of the Bianbianshan deposit may have a relationship with the Cretaceous volcanic-subvolcanic magmatic activity, and formed during the late stage of the crust thinning of North China.

关键词： Gold-polymetal deposit isotopes Da Hinggan Mountains China

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

中非新元古代造山带钴超常富集研究进展与展望

引用

岩石学报 2024年第10期40卷 3037-3054页

作者：刘天宇邱正杰周伶俐胡乔帆莫江平曾庆栋范宏瑞中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所北京100029 中国科学院大学地球与行星科学学院北京100049 阿姆斯特丹自由大学地球科学系阿姆斯特丹1081 HV 中国有色桂林矿产地质研究院有限公司桂林541004

钴被誉为“低碳能源金属”,是我国乃至全球急缺的关键金属矿产。中非新元古代铜钴矿带内的沉积岩容矿型铜钴矿床每年为全球提供了60%以上的钴金属产量,是研究钴超常富集的最佳区域。前人对该矿带的研究主要聚焦于铜的成矿作用,然而该矿... 详细信息

钴被誉为“低碳能源金属”,是我国乃至全球急缺的关键金属矿产。中非新元古代铜钴矿带内的沉积岩容矿型铜钴矿床每年为全球提供了60%以上的钴金属产量,是研究钴超常富集的最佳区域。前人对该矿带的研究主要聚焦于铜的成矿作用,然而该矿带内的铜矿床并非都伴生钴,目前对伴生钴的来源-富集过程及其与沉积、成岩、造山作用的成因联系仍缺乏系统研究。本文综述了中非铜钴矿带内沉积岩容矿型铜钴矿床主要研究进展及存在问题,认为超大陆裂解过程改变了中非铜钴矿带的沉积盆地环境,使得钴在沉积地层中发生初始预富集,此外古气候条件,包括增氧事件和冰川事件,也可能对该矿带内的大规模钴的聚集产生了积极作用。新元古代造山作用重新活化沉积地层呈分散分布的钴元素,导致钴的进一步富集。因此,中非铜钴矿带中的钴超常富集是大气-地球-水圈-生物圈之间长期相互作用而形成的成矿效应。在矿床尺度,深入理解沉积岩容矿型铜钴矿床的形成过程,有助于在中非铜钴矿带,甚至在全球其他有利沉积盆地内,勘探更多的钴资源。

关键词：新元古代造山带钴超常富集沉积岩容矿型铜钴矿床中非铜钴矿带

来源：

维普期刊数据库博看期刊

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

Genetic links of porphyry Mo-epithermal Pb–Zn–Ag mineralization system:a case study of the Shipingchuan polymetallic deposit,South China

引用

Acta Geochimica 2022年第2期41卷 307-323页

作者： Yongbin Wang Peiling Feng Lingli Zhou qingdong zeng Yunnan Key Laboratory of Earth System Science Yunnan University650500 KunmingChina Key Laboratory of critical minerals metallogeny in universities of Yunnan province Yunnan University650500 KunmingChina iCRAG and School of Earth Sciences University College DublinBelfi eld Dublin 4Ireland Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences100029 BeijingChina Innovation Academy for Earth Science Chinese Academy of Sciences100029 BeijingChina College of Earth and Planetary Sciences University of Chinese Academy of Sciences100049 BeijingChina

Compared with the porphyry Cu-epithermal Au mineralization system,detailed studies on the porphyry Mo-epithermal Pb–Zn–Ag–Au mineralization are rare due to limited *** Shipingchuan polymetallic deposit,located in the South China Mo Province(SCMP)represents a typical example containing both porphyry Mo and epithermal Pb–Zn–Ag *** Mo mineralization mainly occurs as molybdenite-quartz veins in veinlets or as disseminated molybdenite within the potassic,silicic,and sericitic *** Pb–Zn–Ag mineralization is characterized by veinlet-type sphalerite–galena–pyrite–quartz–calcite vein within the volcanic rocks accompanied with silicifi cation and *** molybdenite samples yield a Re–Os isochron age of 104.7±0.7 Ma that is consistent with the zircon age(107.5±2.1 Ma)of the ore-bearing syenogranite within *** with previous reported Ar–Ar ages(106.6–121.8 Ma)of Pb–Zn–Ag related volcanic rocks,the Mo and Pb–Zn–Ag mineralization belong to a magmatic-hydrothermal event in the Early ***,the total Re contents of molybednite range from 1.28 to 45.55 ppm,indicating the ore-forming materials were from a mixture between the mantle and crustal ***,previous sulfur isotopic values(3.7–4.3‰)of the pyrites from the porphyry Mo mineralization were consistent with the reported range of 4.0–6.1‰of the sphalerites from the Pb–Zn–Ag mineralization,implying that the sulfur of two-types of mineralization was derived from *** above-mentioned spatial,temporal,and isotopic lines of evidence suggest that the Mo and Pb–Zn–Ag mineralization of the Shipingchuan deposit was formed from the same metallogenic *** consideration of regional tectonic evolution history,we propose that the porphyry Mo-epithermal Pb–Zn–Ag mineralization formed in an extensional tectonic setting caused by the continued rollback and the eventual slab break-off of the subducting PaleoPacifi c plate.

关键词： U-Pb Re-Os Shipingchuan South China Mo Province Porphyry Polymetallic deposit

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：