检索结果-南通市图书馆

numerical assessment of spacing–burden ratio to effective utilization of explosive energy

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and technology 2015年第2期25卷 291-297页

作者： Sazid Mohd Singh t.n. Mining Engineering Department King Abdulaziz University Department of Earth Sciences Indian Institute of Technology-Bombay

the spacing–burden(S/B) ratio plays significant role on rock fragmentation and proper utilization of explosive energy to minimize the undesirable *** S/B ratio generates fine fragments due to pressure rings coalescence of two blast holes,whereas boulder generations were observed above optimum S/B *** conditions are not acceptable because of wastage of explosive ***,to resolve this issue,a numerical model study was conducted to optimize the S/B ratio and to envisage its effect on rock fragmentation based on utilization of explosive *** element simulation tool was used to see the ext.n. of two blast hole influence area variation with varying S/B *** better results were obtained at S/B ratio of 1:2 with optimum utilization of peak explosive *** performance was observed based on peak kinetic energy,peak pressure,radial and hoop stresses on centre of the two blast holes,where pressure rings coalescence.

关键词： Rock blast.n. Spacing-burden ratio (S/B)Rock fragmentation numerical modelling Pressure rings

Scalable Ir‑Doped niFe_(2)O_(4)/tiO_(2)Heterojunction Anode for Decentralized Saline Wastewater treatment and H_(2)Production

在线全文

学校读者我要写书评

暂无评论

nano-Micro Letters 2025年第3期17卷 1-18页

作者： Sukhwa Hong Jiseon kim Jaebeom Park Sunmi Im Michael R.Hoffmann Kangwoo Cho Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 790−784Korea Linde Laboratory California Institute of TechnologyPasadenaCA 91125USA Institute for Convergence Research and Education in Advanced technology(I‑CREAtE) Yonsei University International CampusIncheon 21983Republic of Korea

Wastewater electrolysis cells(WECs)for decentralized wastewater treatment/reuse coupled with H_(2)production can reduce the carbon footprint associated with transportation of water,waste,and energy *** study reports Ir-doped niFe_(2)O_(4)(nFI,~5 at%Ir)spinel layer with tiO_(2)overlayer(nFI/tiO_(2)),as a scalable heterojunction anode for direct electrolysis of wastewater with circumneutral pH in a single-compartment *** dilute(0.1 M)naCl solutions,the nFI/tiO_(2)marks superior activity and selectivity for chlorine evolution reaction,outperforming the benchmark IrO_(2).Robust operation in near-neutral pH was *** including operando X-ray absorption spectroscopy unveiled crucial roles of tiO_(2) which serves both as the primary site for Cl−chemisorption and a protective layer for nFI as an ohmic *** electrolysis of nH4+-laden synthetic wastewater demonstrated that.n.I/tiO_(2)not only achieves quasi-stoichiometric nH_(4)^(+)-to-n_(2)conversion,but also enhances H_(2)generation efficiency with minimal compet.n. reactions such as reduction of dissolved oxygen and reactive *** scaled-up WEC with nFI/tiO_(2)was demonstrated for electrolysis of toilet wastewater.

关键词： Wastewater electrolysis cell Ir-doped niFe_(2)O_(4) Reactive chlorine species Decentralized H_(2)production On-site wastewater treatment

Evaluation of hydrogeochemical characteristics of groundwater in parts of the lower Benue trough,nigeria

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2010年第4期29卷 398-406页

作者： nganje t.n. Adamu C.I. Ugbaja A.n. Amah A.E. Department of Geology University of Calabar

the aim of this work is to evaluate the hydrogeochemical characteristics of groundwater in parts of the lower Benue through in nigeria as well as to evaluate the variation in groundwater chemistry data and the suitability of the groundwater for drinking and other domestic *** was based on chemical analyses of 44 water samples from exist.n. wells and boreholes in the study *** the statistical analysis(wide ranges,median and st.n.ard deviation),it is obvious that there are significant variations in the quality/composition of groundwater in the period of *** calculated SAR,na% and RSC values indicated that the water is of excellent to good quality and is suitable for *** and HCO3 are dominant with respect to the chemical composition of the *** the basis of water chemistry,hydrochemical indices and factor analysis the dominant controls or processes affect.n. the distribution of geochemical variables in the study area have been shown to be water/rock interaction which is mainly controlled by carbonate and silicate dissolution as well as anthropogenic influence to a lesser *** processes include cation exchange reactions and reverse ion exchange to a minor ext.n..

关键词：水文地球化学特征饮用地下水尼日利亚离子交换反应水化学指标海槽评价特别行政区

Leveraging ROtI map derived from Indonesian GnSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan n.Muafiry teguh n.Pratama Angga Y.Putra Suraina Gatot H.Pramono Sidik t.Wibowo Febrylian F.Chabibi Umar A.Ahmad Wildan P.tresna Asnawi Research Center for Climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia Directorate of Laboratory Management Facilities and Science and technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics Laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research Center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(BIG) JakartaIndonesia Research Center for Phot.n.cs Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia Department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

this paper highlights the crucial role of Indonesia’s GnSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GnSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(BIG),the Indonesia Cont.n.ously Operat.n. Reference Station(Ina-CORS)network comprises over 300 GnSS receivers spanning equatorial to southern low-latitude ***-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPB research,by sharing two-dimensional rate of total Electron Cont.n.(tEC)change index(ROtI)derived from this *** generate ROtI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROtI maps of Ina-CORS are ***,the Ina-CORS ROtI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the pot.n.ial for these irregularities to migrate farther ***,we demonstrate that combined ROtI maps from Ina-CORS and GnSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROtI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simult.n.ous ionospheric irregularities in Japan and Australia,respectively propagat.n. northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROtI maps from Indonesia and integrat.n. them with regional GnSS networks,researchers can conduct comprehensive EPB studies,enhancing the underst.n.ing of EPB behavior across Southeast and East Asia and contribut.n. significantly to ionosphe

关键词： Equatorial Plasma Bubble(EPB) GnSS receivers’network Indonesia Cont.n.ously Operat.n. Reference Station(Ina-CORS) ionospheric map Rate of tEC change index(ROtI)map

Heavy metal concentrations in soils and plants in the vicinity of Arufu lead-zinc mine, Middle Benue trough, nigeria

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2010年第2期29卷 167-174页

作者： nganje t.n. Adamu C.I. Ukpong E.E. Department of Geology University of Calabar Formerly Department of Geology University of Calabar

this study focused on the influence of base metal mining on heavy metal levels in soils and plants in the vicinity of Arufu lead-zinc mine, nigeria. Soil samples (0-15 cm depth) and plant samples were collected from cul-tivated farmlands in and around the mine, the unmineralized site and a nearby forest (the control site). the samples were analyzed for heavy metals (Fe, Zn, Mn, Cu, Pb, Cr and Cd) by Atomic Absorption Spectrophotometry (AAS). the physical properties of soils (pH and LOI) were also measured. Results showed that soils from cultivated farm-lands have neutral pH values (6.5-7.5), and low organic matter cont.n.s (n, Pb and Cd in culti-vated soils were higher than the concentrations obtained from the control site. these heavy metals are most probably sourced from mining and agricultural activities in the study area. Heavy metal concentrations measured in plant parts decreased in the order of rice leaves>cassava tubers>peelings. In the same plant species, metal levels decreased in the order of Zn>Fe>Mn>Cu>Pb>Cr>Cd. Most heavy metals were found in plant parts at average concentrations normally observed in plants grown in uncontaminated soil, however, elevated concentrations of Pb and Cd were found in a few cassava samples close to the mine dump. A stepwise linear regression analysis identified soil metal cont.n.s, pH and LOI as some of the factors influencing soil-plant metal uptake.

关键词：土壤重金属含量土壤样品植物样本铅锌矿尼日利亚原子吸收光谱法线性回归分析 amp

Logic-in-memory cell enabling binary and ternary Boolean logics

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年

作者： Jeongyun OH Juhee JEOn Yunwoo SHIn Kyougah CHO Sangsig kim Department of Electrical Engineering Korea University

In comput.n. systems, processing and memory units have been integrated into logic-in-memory (LiM) to enhance the computational efficiency and performance. LiM has been attempted to perform not only binary but also ternary logic functions, which reduces comput.n. complexity. Herein, we demonstrate a binary and ternary LiM (Bt-LiM) cell with eight triple-gated (tG) feedback field-effect transistors (FBFEts) reconfigured into n-or p-channel modes. the tG FBFEts exhibit symmetrical latch-up voltages and an on-current ratio of 1.02 between the n-and p-channel modes, which indicates a high pot.n.ial for reconfigurable logic applications. the Bt-LiM cell can perform YES, nOt, AnD, OR, nAnD, nOR, XnOR, and XOR logic functions in a single cell because of these reconfigurable characteristics. Further, binary and ternary logic functions are realized in the cell without a programming stage, and the cell maintains the results of the logic functions under zero-bias conditions. this study achieves multifunctional LiM that can operate all binary and ternary Boolean logics.

关键词：

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by three‑Dimensionally Conductive MOF network for Gas and Pressure Sensing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng Hu Long Yang Zit.n. Kan Biao Dong Miae Won Hongwei Song Lin Xu Jong Seung kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea theranoChem Incorporation Seoul 02856Republic of Korea

the rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHtP)_(2) particles onto the hollow spherical ti_(3)C_(2)t_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic ti_(3)C_(2)t_(x)@Cu_(3)(HHtP)_(2) exhibits independent.n._(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrat.n. the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external nO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible rout.n. to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： ti_(3)C_(2)t_(x)@Cu_(3)(HHtP)_(2)composites nO_(2)/pressure flexible sensors Health-monitoring Machine learning

numerical analysis of a magnetohydrodynamic duct flow with flow channel insert under a non-uniform magnetic field

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2018年第6期30卷 1134-1142页

作者： C.n.kim Department of Mechanical Engineering College of Engineering Kyung Hee University

this study performs a numerical analysis of three-dimensional liquid metal(LM) magnetohydrodynamic(MHD) flows in a square duct with an FCI in a non-uniform magnetic field. the current study predicts detailed information on flow velocity, Lorentz force, pressure, current and electric pot.n.ial of MHD duct flows for different Hartmann numbers. Also, the effect of the electric conductivity of FCI on the pressure drop along the main flow direction in a non-uniform magnetic field is examined. the present study investigates the features of LM MHD flows in consideration of the interdependency among the flow variables.

关键词： non-uniform magnetic field liquid metal blanket magnetohydrodynamic(MHD) duct flow flow channel insert

Vickers and Knoop Micro-hardness Behavior of Coarse-and Ultrafine-grained tit.n.um

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & technology 2010年第10期26卷 904-907页

作者： K.P.Sanosh A.Balakrishnan L.Francis t.n.kim Department of Information and Electronic Materials Engineering College of EngineeringPaichai University Laboratoire SIMAP GPM2 Grenoble-INPUJFCNRS 101 Rue de la PhysiqueBP46 38402 Saint Martin d'He' res CedexFrance University of Genova Department of Chemistry and Industrial Chemistry

the present study focuses on the relationship of hardness with grain size for commercially pure tit.n.um （Cpti） and ultra fine grained tit.n.um （UFG-ti） produced by equal channel angular process （ECAP） of Cp-ti）.Vickers and Knoop indentations of UFG-ti at different loads was ～2.5 times harder than those of *** diffraction （XRD） analysis showed peak broadening in UFG-ti due to reduced grain size and micro-lattice *** electron microscopy （SEM） revealed that ECAP had reduced the grain size of Cp-ti by ～10 *** statistics showed UFG-ti with lower dispersion in hardness values compare to Cp-ti indicat.n. a more uniform microstructure.

关键词： Vickers Knoop Hardness Ultrafine-grained tit.n.um