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A fast forward computational method for nuclear measurement using volumetric detection constraints

Nuclear Science and Techniques 2024年第2期35卷 47-63页

作者： Qiong Zhang Lin-lv Lin University of Electronic Science and Technology of China Chengdu 610000China

Owing to the complex lithology of unconventional reservoirs,field interpreters usually need to provide a basis for interpretation using logging simulation *** the various detection tools that use nuclear sources,the detector response can reflect various types of information of the *** Monte Carlo method is one of the primary methods used to obtain nuclear detection responses in complex ***,this requires a computational process with extensive random sampling,consumes considerable resources,and does not provide real-time response ***,a novel fast forward computational method(FFCM)for nuclear measurement that uses volumetric detection constraints to rapidly calculate the detector response in various complex environments is ***,the data library required for the FFCM is built by collecting the detection volume,detector counts,and flux sensitivity functions through a Monte Carlo ***,based on perturbation theory and the Rytov approximation,a model for the detector response is derived using the flux sensitivity function method and a one-group diffusion *** environmental perturbation is constrained to optimize the model according to the tool structure and the impact of the formation and borehole within the effective detection ***,the method is applied to a neutron porosity tool for *** various complex simulation environments,the maximum relative error between the calculated porosity results of Monte Carlo and FFCM was 6.80%,with a rootmean-square error of 0.62 *** field well applications,the formation porosity model obtained using FFCM was in good agreement with the model obtained by interpreters,which demonstrates the validity and accuracy of the proposed method.

关键词： Nuclear measurement Fast forward computation Volumetric constraints

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Ultra-Short Wave Communication Squelch Algorithm Based on Deep Neural Network

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Big Data Mining and Analytics 2023年第1期6卷 106-114页

作者： Yuanxin Xiang Yi lv Wenqiang Lei Jiancheng lv College of Computer Science Sichuan UniversityChengdu 610000China Sichuan Research Institute Shanghai Jiao Tong UniversityChengdu 610000China

The squelch problem of ultra-short wave communication under non-stationary noise and low Signal-to-Noise Ratio(SNR)in a complex electromagnetic environment is still *** alleviate the problem,we proposed a squelch algorithm for ultra-short wave communication based on a deep neural network and the traditional energy decision *** proposed algorithm first predicts the speech existence probability using a three-layer Gated Recurrent Unit(GRU)with the speech banding spectrum as the *** it gets the final squelch result by combining the strength of the signal energy and the speech existence *** simulations and experiments are done to verify the robustness and effectiveness of the proposed *** simulate the algorithm in three situations:the typical Amplitude Modulation(AM)and Frequency Modulation(FM)in the ultra-short wave communication under different SNR environments,the non-stationary burst-like noise environments,and the real received signal of the ultra-short wave *** experimental results show that the proposed algorithm performs better than the traditional squelch methods in all the simulations and *** particular,the false alarm rate of the proposed squelch algorithm for non-stationary burst-like noise is significantly lower than that of traditional squelch methods.

关键词： squelch Gated Recurrent Unit(GRU) ultra-short wave communication

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Anthraquinone derivatives supported by Ti3C2(MXene)as cathode materials for aluminum-organic batteries

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Journal of Energy Chemistry 2022年第11期31卷 174-183,I0006页

作者： Gaohong Wu Cuncai lv Wenrong lv Xiaoxiao Li Wenming Zhang Zhanyu Li Hebei Key Laboratory of Optic-Electronic Information and Materials National&Local Joint Engineering Laboratory of New Energy Photoelectric DevicesCollege of Physics Science and TechnologyHebei UniversityBaoding 071002HebeiChina

Due to the advantages of aluminum in abundance in the earth’s crust and safety,how to exploit these advantages to develop high-performance rechargeable aluminum batteries to replace traditional batteries has become an urgent *** key to solving this problem is to find suitable materials as cathode for aluminum ***,we propose a strategy in which Ti_(3)C_(2)(MXene)is used as a loaded structure for the organic anthraquinone derivative Benzo[1,2-b:4,5-b’]dithiophene-4,8-dione(BDTO).This strategy enables the self-stacking of monolayer MXene into a layered structure while embedding organics into *** unique structure enables efficient and reversible intercalation/deintercalation of Al^(3+).At the same time,it exhibits excellent electrochemical performance,and its reversible capacity reaches229.8 mAh g^(-1).Moreover,it can still maintain a capacity of 134.9 mAh g^(-1)after 500 *** *** with BDTO,the rate performance of MXene@BDTO has also been greatly ***,this unique layered structure also brings better electro nic co nductivity and ionic diffusion *** also demonstrate that the battery mechanism is a reaction between three C=O and one Al^(3+) through multiple characterization methods and density functional calculations(DFT).The advantages of MXene@BDTO provide a better research basis for the study of rechargeable Aluminum-Organic batteries,and provide a good idea to explore the development of Aluminum-Organic batteries.

关键词： Aluminum-organic batteries MXene Quinone-based cathodes Carbonyl group Energy storage mechanism

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Effect of basicity and Al2O3 on viscosity of ferronickel smelting slag

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Journal of Iron and Steel Research International 2020年第12期27卷 1400-1406页

作者： Yong-feng Chen Xue-ming lv Zheng-de Pang Xue-wei lv Wuhu Xinxing Ductile Iron Pipes Co. Ltd.Wuhu 241000AnhuiChina Pangang Group Research Institute Co. Ltd.Panzhihua 617000SichuanChina Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The effect of the Al2O3 content and basicity (the molar ratio of MgO to SiO2) on the viscosity of a SiO2-MgO-FeOAl2O3-CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimental results show that the slag is a mixture of liquid and solid phases at the experimental temperature. The viscosity decreased as the basicity increased and increased as the Al2O3 content increased. To determine the effect of the Al2O3 content and basicity on the structure of the molten slag, Raman spectroscopy was performed on the slag sample, which was quenched from the high temperature with water. The Raman spectra showed that the fractions of the polymerization structural units decreased significantly as the basicity of the slag increased, resulting in a decrease in the apparent viscosity. However, Al2O3 acts as a network former in the slag system, thereby making the slag structure further polymerized and increasing the viscosity.

关键词： Nickel laterite ore Slag structure Viscosity Basicity Ferronickel smelting slag

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Synergism and anion-cation dual chemical substitution in heterostructure sprouted on MXene enable high-efficiency and stable overall water splitting

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Journal of Materials Science & Technology 2023年第16期147卷 207-216页

作者： Zepeng lv Jinshuai Fei Yang You Xuewei lv Qian Li Jie Dang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The exploration of novel,super-potent and low-cost electrocatalysts for water splitting has always been the kernel in the field of renewable ***,exfoliated Ti_(3)C_(2)T_(x) MXenes work as a substrate to vertically grow polypore N,Ni-Co2P nanoarrays(N,Ni-Co2P@TC)through an in situ interface-growth strategy and subsequent phosphorization and *** well-defined heterointerfaces with positive and negative ions co-modulation as coupled hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)catalysts for efficient overall water splitting are investigated,which possesses excellent durability even at a large current density(±500 mA cm^(-2)).For HER,suitable H_(2)O∗and H∗absorption energies and accelerated electronic transmission make N,Ni-Co2P@TC display a low overpotential of 27 mV at-10 mA cm^(-2) and Tafel slope of 38 mV dec^(–1) in 1 mol/L *** OER,the synergy of N,Ni-Co2P@TC with selfreconfiguration can give enhanced activity with a low overpotential of 232 mV at 10 mA cm^(-2) and a Tafel slope of 57 mV dec^(–1).Additionally,the excellent bifunctional activity allows easily combining for efficient overall water splitting with a low driving voltage(1.51 V)at 10 mA cm^(-2),and the electrolyzer can be driven by a 1.5 V AAA battery.

关键词： Synergism Chemical substitution Heterostructure Overall water splitting MXene

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Revenue-maximizing online stable task assignment on taxi-dispatching platforms

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Frontiers of Computer Science 2022年第6期16卷 175-177页

作者： Jingwei lv Ze ZHAO Shuzhen YAO Weifeng lv School of Computer Science and Engineering Beihang UniversityBeijing100191China School of Mathematical Science Beihang UniversityBeijing100191China

1 Introduction and contributions With the rapid development of mobile Internet,taxi-dispatching platforms have become increasingly popular and *** example,UBer and Didi are both famous O2O platforms covering the dominating portion of the taxidispatching market over the world.A central issue in taxidispatching platforms is task assignment.

关键词： O2O assignment platforms

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A GREEDY ALGORITHM FOR SPARSE PRECISION MATRIX APPROXIMATION

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Journal of Computational Mathematics 2021年第5期39卷 693-707页

作者： Didi lv Xiaoqun Zhang School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China School of Mathematical Sciences MOE-LSC and Institute of Natural SciencesShanghai Jiao Tong UniversityShanghai 200240China

Precision matrix estimation is an important problem in statistical data *** paper proposes a sparse precision matrix estimation approach,based on CLIME estimator and an efficient algorithm GISSP that was originally proposed for li sparse signal recovery in compressed *** asymptotic convergence rate for sparse precision matrix estimation is analyzed with respect to the new stopping criteria of the proposed GISSP ***,numerical comparison of GISSP with other sparse recovery algorithms,such as ADMM and HTP in three settings of precision matrix estimation is provided and the numerical results show the advantages of the proposed algorithm.

关键词： Precision matrix estimation CLIME estimator Sparse recovery Inverse scale space method Greedy methods

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Antibacterial Properties of an Austenitic Antibacterial Stainless Steel and Its Security for Human Body

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Journal of Materials Science & Technology 2007年第3期23卷 333-336页

作者： Ke YANG Manqi lv Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

An austenitic antibacterial stainless steel is reported in this paper. The very fine and dispersive ε-Cu precipitations in the matrix of the antibacterial steel after the antibacterial treatment endow the steel with antibacterial function. The antibacterial function is strong, long-term and broad-spectrum, and can be maintained even after repeated wear and long time dipping in water. The steel is safe for human body and could be used widely in daily application.

关键词： Antibacterial Austenitic steel Body security

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Xenobiotic receptors in mediating the effect of sepsis on drug metabolism

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Acta Pharmaceutica Sinica B 2020年第1期10卷 33-41页

作者： Chuanzhu lv Ling Huang Department of Emergency Hainan Clinical Research Center for Acute and Critical DiseasesThe Second Affiliated Hospital of Hainan Medical UniversityHaikou 570300China Emergency and Trauma College Hainan Medical UniversityHaikou 571101China Research Unit of Island Emergency Medicine Chinese Academy of Medical SciencesHainan Medical UniversityHaikou 571101China Research Center for Drug Safety Evaluation of Hainan Province Hainan Medical UniversityHaikou 571101China Hainan Province Key Laboratory for Drug Preclinical Study of Pharmacology and Toxicology Research Hainan Medical UniversityHaikou 571101China Key Laboratory of Emergency and Trauma of Ministry of Education Hainan Medical UniversityHaikou 571101China

Sepsis is an infection-induced systemic inflammatory *** immune response in sepsis is characterized by the activation of both proinflammatory and anti-inflammatory *** sepsis occurs,the expression and activity of many inflammatory cytokines are markedly *** receptors are chemical-sensing transcription factors that play essential roles in the transcriptional regulation of drug-metabolizing enzymes(DMEs).Xenobiotic receptors mediate the functional crosstalk between sepsis and drug metabolism because the inflammatory cytokines released during sepsis can affect the expression and activity of xenobiotic receptors and thus impact the expression and activity of *** receptors in turn may affect the clinical outcomes of *** focuses on the sepsis-induced inflammatory response and xenobiotic receptors such as pregnane X receptor(PXR),aryl hydrocarbon receptor(AHR),glucocorticoid receptor(GR),and constitutive androstane receptor(CAR),DMEs such as CYP1A,CYP2B6,CYP2C9,and CYP3A4,and drug transporters such as p-glycoprotein(P-gp),and multidrug resistance-associated protein(MRPs)that are affected by *** the xenobiotic receptor-mediated effect of sepsis on drug metabolism will help to improve the safe use of drugs in sepsis patients and the development of new xenobiotic receptor-based therapeutic strategies for sepsis.

关键词： Sepsis Inflammatory cytokines Xenobiotic receptors Drug metabolism Drug-metabolizing enzymes Drug transporters

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Early planetary processes and light elements in iron-dominated cores

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Acta Geochimica 2022年第4期41卷 625-649页

作者： Chaojia lv Jin Liu Center for High Pressure Science and Technology Advanced Research Beijing100094China CAS Center for Excellence in Deep Earth Science Guangzhou510640China

This paper discusses the latest research on the accretion and differentiation of terrestrial planets and multidisciplinary constraints on light elements in irondominated metallic *** classic four-stage model of terrestrial planet formation advocates slow and local ***,the pebble accretion model suggests fast accretion for planets,while the Grand Tack model provides heterogeneous accretion *** planets and small interstellar bodies may have experienced at least some degree of partial melting due to the three primary energy sources(i.e.,the decay of short-lived radioactive nuclides,the kinetic energy delivered by impacts,and the conversion of gravitational potential energy).Together with metal-silicate separation mechanisms,the magma ocean theory depicts the pattern of core formation in terrestrial *** hypotheses have been proposed to explain the concentration of siderophile elements in the mantle,including the single-stage,continuous,and multistage core formation models,and the lateveneer *** light elements have been postulated in the core to account for Earth’s outer core density deficit.A plethora of constraints on the species and concentration of light elements have been put forward from the perspectives of cosmochemical and geochemical fingerprints,geophysical observations,mineral physics,numerical modeling,and theoretical *** and O may be the two leading candidates for Earth’s outer core light elements;however,it still remains an open question.S is another potential light element in Earth’s core,most likely with less than 2 wt%.Other light elements including H and C,may not exceed1 wt%in the ***,the accretion and differentiation history would provide some clues to light elements in other terrestrial planetary *** principle,a larger heliocentric distance corresponds to accretion from more oxidized materials,leading to a higher S concentration in the Martian *** the contrary,Me

关键词： Terrestrial accretion Early processes Coremantle differentiation Core composition

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