检索结果-南通市图书馆

Geochemistry and mineralogy of beach sediments in the northern Gulf of Mexico,Tamaulipas state,Mexico:implication for provenance

引用

Journal of Palaeogeography 2024年第3期13卷 375-400页

作者： Mayank Shukla Sanjeet K.Verma Mayla A.Ramos-Vázquez John S.Armstrong-Altrin Karla R.Hernández-Martínez Sumit Mishra Vivek P.Malviya Héctor Hernández-Mendoza Posgrado de la Division de Geociencias Aplicadas Instituto Potosino de Investigacion Científica y Tecnologica(IPICYT)Camino a la Presa San José2055San Luis Potosí78216Mexico Division de Geociencias Aplicadas Instituto Potosino de Investigación Científica y Tecnologica(IPICYT)Camino a la Presa San Jose 2055San Luis Potosí78216Mexico Universidad Nacional Autonoma de México Instituto de Ciencias del Mar y LimnologíaUnidad de ProcesosOceanicos y CosterosCiudad UniversitariaCiudad de México 04510Mexico Department of Marine Sciences Bharathidasan UniversityTiruchirappalli620024Tamil NaduIndia Instituto de Geociencias Universidad Nacional Autonoma de MéxicoBoulevard Juriquilla 300176230JuriquillaQueretaroMexico Department of Applied Geology Dr.Harisingh Gour Central UniversitySagar470002Madhya PradeshIndia Instituto de Investigacion de Zonas Desérticas Universidad Autònoma de San Luis PotosíAltair 200CP 78377San LuisS.L.P.Mexico Universidad del Centro de Mexico Capitán Caldera 75CP 78250San LuisS.L.P.Mexico

Geochemical and mineralogical studies were performed in the La Pesca(LP)and Tesoro Altamira(TA)beach sediments,located in the Tamaulipas state,northern Gulf of *** main aim of this study is to infer the weathering history and provenance and to discriminate the tectonic environment of the beach *** sediments are composed of quartz with small amounts of accessory minerals such as plagioclase,calcite,orthoclase,microcline,and *** beach sediments are classified as fine-grained and very well sorted,however LP has coarse skewed and leptokurtic sediments,whereas TA has fine-skewed and very leptokurtic *** chemical index of weathering(CIW’)indicates intense weathering in the source *** quartz grain microtextures in the LP and TA are classified into mechanical,chemical,and mechanical/chemical *** features such as fractures,pits,percussion marks,abrasion fatigue,and V-shaped marks favor high-energy littoral,fluvial,subaqueous-marine,and aeolian *** chemical features indicate solution pits and crystalline overgrowth,which suggests a silica saturated marine *** mechanical/chemical features display adhering particles and elongated depressions suggest formation in a sub-aqueous nearshore marine *** and trace elements-based provenance discrimination diagrams indicate a felsic source derived from the Mesa Central(MC),Sierra Madre Oriental(SMOr)and Oaxaquia *** major and trace element concentrations imply a passive margin setting for the northern Gulf of Mexico,which is consistent with the general geology.

关键词： Beach sediments Geochemistry Mineralogy Provenance Tamaulipas Tectonic setting

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

Neural Decoding of Visual Information Across Different Neural Recording Modalities and Approaches

引用

Machine Intelligence Research 2022年第5期19卷 350-365页

作者： Yi-Jun Zhang Zhao-Fei Yu Jian.K.Liu Tie-Jun Huang Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Computer Science Peking UniversityBeijing 100190China Institute for Artificial Intelligence Peking UniversityBeijing 100190China School of Computing University of LeedsLeeds LS29JTUK Beijing Academy of Artificial Intelligence Beijing 100190Chin

Vision plays a peculiar role in *** information,forming a large part of the sensory information,is fed into the human brain to formulate various types of cognition and behaviours that make humans become intelligent *** advances have led to the development of brain-inspired algorithms and models for machine *** of the key components of these methods is the utilization of the computational principles underlying biological ***,advanced experimental neuroscience techniques have generated different types of neural signals that carry essential visual ***,there is a high demand for mapping out functional models for reading out visual information from neural ***,we briefly review recent progress on this issue with a focus on how machine learning techniques can help in the development of models for contending various types of neural signals,from fine-scale neural spikes and single-cell calcium imaging to coarse-scale electroencephalography(EEG)and functional magnetic resonance imaging recordings of brain signals.

关键词： Neural decoding machine learning deep learning visual decoding brain-inspired vision

来源：

维普期刊数据库

同方期刊数据库

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

Catalytic methane removal to mitigate its environmental effect

引用

Science China Chemistry 2023年第4期66卷 1032-1051页

作者： Chao Wang Youxun Xu Junwang Tang Department of Chemical Engineering University College LondonLondon WCIE 7JEUK

Large reserve of methane,in the form of natural gas and methane hydrate,has been discovered and it has been intensively used as a fuel,or as a building block for the chemical ***,severe environmental and climatic issues caused by the leakage of methane during the production,transportation and use of methane are *** offers incentives for the catalytic removal of ***,due to the inert nature of methane molecules,the activation of methane via thermocatalysis requires harsh reaction *** high reaction temperature not only increases the capital cost but also accelerates the deactivation of catalysts due to sintering and/or *** development of robust and stable catalysts with a low operating temperature has become the focus of the research on thermocatalytic methane ***,which uses the energy of photons instead of heat to drive chemical reactions under ambient conditions,offers another approach to methane *** review will cover the development of high-efficiency catalysts for methane combustion in both thermo-and ***,the fundamental understanding of the active sites,surface chemistry and reaction pathway will also be ***,the challenges facing in the catalytic removal of methane will be summarized and potential solutions will be *** review will be of interest to researchers in the field of heterogeneous catalysis,materials design,and chemical engineering.

关键词： methane oxidation environmental remediation thermocatalysis photocatalysis fundamental understandings

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

Reconstruction of energy spectrum of runaway electrons in nanosecond-pulse discharges in atmospheric air

引用

Plasma Science and Technology 2021年第6期23卷 89-96页

作者： Jintao QIU Cheng ZHANG Zehui LIU Bangdou HUANG Tao SHAO Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China

This paper presents an experimental investigation into the runaway electron spectrum with a gas diode composed of a rough spherical cathode and plane anode under the excitation of a nanosecond-pulse generator in atmospheric *** runaway electron beams are measured by a collector covered with aluminum foil with a thickness from 0μm(mesh grid)to 50μ*** energy spectrum is calculated by an improved Tikhonov regularization called the maximum entropy *** experimental results show that the transition state of the discharge consisted of multiple streamer channels stretched from the cathode with glow-like plasma uniformly distributed over the *** number of runaway electrons measured by the collector is in the order of 1010 in atmospheric pressure air with a gap spacing of 5 mm and applied voltages of70–130 *** cathode with a rough surface creates a more inhomogeneous electric field and larger emission site for the runaway electrons around the cathode,providing conditions for the coexistence of filamentary streamer and diffuse *** reconstructed spectra show that the energy distribution of the runaway electrons presents a single-peak profile with energies from eU_(m/2)–2 eU_(m/3)(U_(m)is maximal voltage across the gap).

关键词： runaway electrons diffuse discharge nanosecond-pulse discharge spectrum reconstruction

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

Year-round changes in tropospheric nitrogen dioxide caused by COVID-19 in China using satellite observation

引用

Journal of Environmental Sciences 2023年第10期132卷 162-168页

作者： Zhenyu Luo Hailian Xu Zhining Zhang Songxin Zheng Huan Liu State Key Joint Laboratory of ESPC State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexSchool of EnvironmentTsinghua UniversityBeijing 100084China

The lockdown policy deals a severe blow to the economy and greatly reduces the nitrogen oxides(NOx)emission in China when the coronavirus 2019 spreads widely in early *** we use satellite observations from Tropospheric Monitoring Instrument to study the year-round variation of the nitrogen dioxide(NO_(2))tropospheric vertical column density(TVCD)in *** NO_(2)TVCD reveals a sharp drop,followed by small fluctuations and then a strong rebound when compared to *** the end of 2020,the annual average NO_(2)TVCD declines by only 3.4%in Chinamainland,much less than the reduction of 24.1%in the lockdown *** the basis of quantitative analysis,we find the rebound of NO_(2)TVCD is mainly caused by the rapid recovery of economy especially in the fourth quarter,when contribution of industry and power plant on NO_(2)TVCD continues to *** revenge bounce of NO_(2)indicates the emission reduction of NOx in lockdown period is basically offset by the recovery of economy,revealing the fact that China’s economic development and NOx emissions are still not *** efforts are still required to stimulate low-pollution development.

关键词： COVID-19 Tropospheric NO2 TROPOMI Economy recovery Environment sustainability

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

Local and regional contributions to PM_(2.5) in the Beijing 2022 Winter Olympics infrastructure areas during haze episodes

引用

Frontiers of Environmental Science & Engineering 2021年第6期15卷 499-509页

作者： Yue Wang Mengshuang Shi Zhaofeng Lv Huan Liu Kebin He State Key Joint Laboratory of ESPC State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexInternational Joint Laboratory on Low Carbon Clean Energy InnovationSchool of the EnvironmentTsinghua UniversityBeijing 100084China

The 2022 Winter Olympics is scheduled to take place in Beijing and Zhangjiakou,which were defined as OIAs(Olympic infirastructure areas)in this *** study presents the characteristics and source apportionment of PM_(2.5) in the OIAs,*** entire region of China's Mainland,except for the OIAs,was divided into 9 source regions,including four regions in the BTH(Beijing-Tianjin-Hebei)region,the four provinces surrounding the BTH and the remaining *** CAMx/PSAT,the contributions of the nine regions to the PM_(2.5) concentration in the OIAs were simulated spatially and *** simulated source apportionment results showed that the contribution of regional transportation was 48.78%,and when PM_(2.5) concentration was larger than 75μg/m^(3) central Hebei was the largest contributor with a contribution of 19.18%,followed by Tianjin,northern Hebei,Shanxi,Inner Mongolia,Shandong,southern Hebei,Henan and ***,the contribution from neighboring regions of the OIAs was 47.12%,which was nearly twice that of long-range *** episodes were analyzed,and the results presented the importance of regional transportation during severe PM_(2.5) pollution *** was also found that they were associated with differences in pollution sources between Zhangjiakou and *** transportation was the main factor affecting PM_(2.5) pollution in Zhangjiakou due to its low local *** weather with a low planetary boundary layer height and a low wind velocity prevented the local emitted pollutants in Beijing from being transported outside,and as a result,local emissions constituted a larger contribution in Beijing.

关键词： 2022 Winter Olympics PM_(2.5) Source apportionment

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 review and evaluation of nonroad diesel mobile machinery emission control in China

引用

Journal of Environmental Sciences 2023年第1期123卷 30-40页

作者： Pengju Bie Liang Ji Huanxing Cui Gang Li Shunli Liu Ying Yuan Kebin He Huan Liu State Key Joint Laboratory of ESPC State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexSchool of EnvironmentInternational Joint Laboratory on Low Carbon Clean Energy InnovationTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental SciencesBeijing 100012China Jinan Automobile Testing Center Co Ltd.Jinan 250102China

China’s emission control for nonroad diesel mobile machinery(NDMM)must deal with a fast increase in stock as well as regulations that are two decades behind those for on-road *** study provides the first large-scale review and evaluation of China’s NDMM policies,along with emission measurements and an investigation on diesel fuel *** sulfur contents of the investigated diesel declined from 430 ppm(median value)in 2011 to6-8 ppm during the 2017-2018 *** emission control of NO_(x)and PM greatly improved with the shift from the China II to China IV standards,as demonstrated by engine tests and field NO_(x)***,the NO_(x)emission factors for non-type-approved engines were approximately twice the limits of the China II *** compliance based on bench tests was not sufficient to control actual emissions because the field-measured NO_(x)emission factors of all machinery ranged from 24%to 225%greater than the respective emission limits for the *** circumstances adversely affected the effectiveness of the regulations and policies for China’s emission control of ***,the policies on new and in-use NDMM,as well as diesel fuel quality,prevented NO_(x)and PM emissions amounting to 4.4 Tg and 297.8 Gg during the period 2008-2017,*** emission management strategy contributed to enhancing the international competitiveness of China’s NDMM industries by promoting advanced *** effective NDMM emission control in the future,portable testing and noncontact remote supervision should be strengthened;also,the issue of noncompliant diesel should be addressed through rigorous control measures and financial penalties.

关键词： Nonroad mobile machinery Emission reduction Emission control policy Emission factor Diesel fuel quality

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-physics-resolved digital twin of proton exchange membrane fuel cells with a data-driven surrogate model

引用

Energy and AI 2020年第1期1卷 22-34页

作者： Bowen Wang Guobin Zhang Huizhi Wang Jin Xuan Kui Jiao State Key Laboratory of Engines Tianjin University135 Yaguan RoadTianjin 300350China Department of Chemical Engineering Loughborough UniversityLoughboroughUK Department of Mechanical Engineering Imperial College LondonLondonUK

The development of multi-physics-resolved digital twins of proton exchange membrane fuel cells(PEMFCs)is sig-nificant for the advancement of this ***,to solve this scientific issue,a surrogate modelling method that combines a state-of-the-art three-dimensional PEMFC physical model and data-driven model is *** surrogate modelling prediction results demonstrate that the test-set relative root mean square errors(rRMSEs)of the multi-physics fields range from 3.88%to 24.80%and can mirror the multi-physics field distribution charac-teristics *** summary,for multi-physics field prediction,the data-driven surrogate model has a comparable accuracy to the comprehensive 3D physical model;however,it considerably reduces the cost of computation and time and achieves the efficient multi-physics-resolved *** model-based designs based on the as-developed digital twin framework,*** PEMFC healthy operation envelope and the PEMFC state map,are *** study highlights the potential of combining data-driven approaches and comprehensive physical models to develop the digital twin of complex systems,such as PEMFCs.

关键词： Proton exchange membrane fuel cell Digital twin Data-driven surrogate model Three-dimensional physical model Model-based design

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

Rhizosphere microbiomes can regulate plant drought tolerance

引用

Pedosphere 2022年第1期32卷 61-74页

作者： Mehtab Muhammad ASLAM Eyalira JOKAL Aisha Lawan IDRIS Zhang QIAN Weifeng XU Joseph K.KARANJA Shabir HWANI Wei YUAN College of Agriculture Yangzhou UniversityYangzhou 225009China Joint International Research Laboratory of Water and Nutrient in Crops and College of Life Sciences Center for Plant Water-Use and Nutrition Regulation and College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China Juncao Research Center College of Life SciencesFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops&Key Laboratory of Biopesticide and Chemical Biology of Ministry of Education College of Life SciencesFujian Agriculture and Forestry UniversityFuzhou 350002China Mountain Research Centre for Field Crops Khudwani Sher-e-Kashmir University of Agricultural Sciences and TechnologyKashmir 192102India

Beneficial root-associated rhizospheric microbes play a key role in maintaining host plant growth and can potentially allow drought-resilient crop production. The complex interaction of root-associated microbes mainly depends on soil type, plant genotype, and soil moisture. However, drought is the most devastating environmental stress that strongly reduces soil biota and can restrict plant growth and yield. In this review, we discussed our mechanistic understanding of drought and microbial response traits. Additionally, we highlighted the role of beneficial microbes and plant-derived metabolites in alleviating drought stress and improving crop growth. We proposed that future research might focus on evaluating the dynamics of root-beneficial microbes under field drought conditions. The integrative use of ecology, microbial, and molecular approaches may serve as a promising strategy to produce more drought-resilient and sustainable crops.

关键词： biota drought stress metabolites phytohormone plant growth root-microbe association

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

Photocatalytic Aerobic Oxysulfonylation of Alkynes to Access β-Keto Sulfones Catalyzed by OVs-N-Nb_(2)O_(5)

引用

Chinese Journal of Chemistry 2022年第22期40卷 2618-2624页

作者： Tao Song Yinpan Zhang Chun Wang Yafei Li Yong Yang CAS Key Laboratory of Bio-based Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesShandong Energy InstituteQingdaoNewEnergyShandongLaboratoryQingdaoShandong266101China Schoolof Chemistry and Materials Science Nanjing Normal UniversityNanjingJiangsu 210023China

Herein,we report a novel heterogeneous photocatalyst for radical-mediated oxidative oxysulfonylation of alkynes toβ-keto sulfones under environmentally benign *** oxygen vacancy-rich semiconductor Nb2O5(labeled as OVs-N-Nb_(2)O_(5))could efficiently catalyze a wide range of alkynes,especially for those bearing electron-deficient substituents or internal alkynes,to their correspondingβ-keto sulfones in good to high yields with good tolerance of diverse functional groups under visible-light *** late-stage modification of steroidal compounds and synthesis of bioactive molecules were also achieved via this procedure,highlighting its potential for practical ***,the photocatalyst OVs-N-Nb_(2)O_(5) showed outstanding catalytic stability for successive recycles without appreciable loss in activity and *** critical role of oxygen vacancies on improving reaction activity and selectivity was clearly disclosed via control experiments and theoretical calculation.

关键词： Oxygen vacancies Semiconducts Photocatalysis Oxysulfonylation of alkynes β-Keto sulfones

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

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：