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Probing the interaction between asphaltene-wax and its effects on the crystallization behavior of waxes in heavy oil via molecular dynamics simulation

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Petroleum Science 2024年第4期21卷 2839-2848页

作者： Yong Hu xi lu Hai-Bo Wang Ji-Chao Fang Yi-ning Wu Jian Fang Sun SINOPEC Petroleum Exploration and Production Research Institute Shandong Key Laboratory of Oilfield Chemistry School of Petroleum Engineering China University of Petroleum (East China)

High content of asphaltenes and waxes leads to the high pour point and the poor flowability of heavy oil,which is adverse to its efficient development and its transportation in *** the interaction mechanism between asphaltene-wax is crucial to solve these problems,but it is still *** this paper,molecular dynamics simulation was used to investigate the interaction between asphaltenewax and its effects on the crystallization behavior of waxes in heavy *** show that molecules in pure wax are arranged in a paralleled *** wax molecules in heavy oil,which are close to the surface of asphaltene aggregates,are bent and arranged *** the mass fraction of asphaltenes in asphaltene-wax system(ωasp) is 0-25 wt%,the attraction among wax molecules decreases and the bend degree of wax molecules increases with the increase of ω*** ωaspincreases from 0 to 25 wt%,and the attraction between asphaltene-wax is stronger than that among *** causes that the wax precipitation point changes from 353 to 333 *** the ωaspincreases to 50 wt%,wax molecules are more dispersed owing to the steric hindrance of asphaltene aggregates,and the interaction among wax molecules transforms from attraction to *** causes that the ordered crystal structure of waxes can't be formed at normal ***,the asphaltene,with the higher molecular weight or the more hetero atoms,has more obvious inhibition to the formation of wax ***,resins also have an obvious inhibition on the wax crystal due to the formation of asphalteneresin aggregates with a larger *** results reveal the interaction mechanism between asphaltene-wax,and provide useful guidelines for the development of heavy oil.

关键词： Heavy oil Interaction mechanism Asphaltenes Waxes Molecular dynamics

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A neuromorphic device mimicking synaptic plasticity under different body fluid K^(+) homeostasis for artificial reflex path construction and pattern recognition

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Fundamental Research 2024年第2期4卷 353-361页

作者： lu Yang Yao ni Chengpeng Jiang lu Liu Song Zhang Jiaqi Liu Lin Sun Wentao Xu Institute of Photoelectronic Thin Film Devices and Technology Key Laboratory of Optoelectronic Thin Film Devices and Technology of TianjinEngineering Research Center of Thin Film Photoelectronic TechnologyMinistry of EducationNankai UniversityTianjin 300350China Shenzhen Research Institute of Nankai University Shenzhen 518000China

The ionic environment of body fluids influences nervous functions for maintaining homeostasis in organisms and ensures normal perceptual abilities and reflex *** reflex activities,such as limb movements,are closely associated with potassium ions(K+).In this study,we developed artificial synaptic devices based on ion concentration-adjustable gels for emulating various synaptic plasticities under different K+concentrations in body *** addition to performing essential synaptic functions,potential applications in information processing and associative learning using short-and long-term plasticity realized using ion concentration-adjustable gels are *** synaptic devices can be used for constructing an artificial neural pathway that controls artificial muscle reflex activities and can be used for image pattern *** tests show a strong relationship with ion *** devices could be applied to neuromorphic robots and human-machine interfaces.

关键词： Nervous regulation Artificial synaptic device Ion gel Ion homeostasis Artificial reflex pathway

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Technical alternatives for coke oven gas utilization in China: A comparative analysis of environment-economic-strategic perspectives

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Environmental Science and Ecotechnology 2024年第5期21卷 168-177页

作者： Zichen Di Feixia Lei Jiankai Jing Hao Peng xi lu Fangqin Cheng Institute of Resources and Environmental Engineering Shanxi UniversityTaiyuan030006PR China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing100084PR China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084PR China

China is the largest coke producer and *** is a pressing need to address the high emissions of air pollutants and carbon dioxide associated with traditional coking *** the nation pursues a transition towards carbon neutrality,expanding supply chains for coking plants to produce hydrogen,methanol,and other green alternatives has garnered significant ***,the relative advantages of these strategies have remained *** this study,we integrate a life cycle assessmenteconomic analysis-scenario analysis model to evaluate various coke oven gas(COG)utilization routes(COGtM:COG-to-methanol,COGtLNG:COG-to-liquefied natural gas,COGtSA:COG-to-synthetic ammonia,and COGtH:COG-to-hydrogen).The results indicate that COGtSA emerges as the preferred option for balancing environmental and economic ***,COGtM demonstrates economic viability but is associated with higher environmental *** being recognized as a significant strategic direction under carbon neutrality initiatives,COGtH faces economic feasibility and risk resilience *** encounters both financial and environmental challenges,necessitating strategic development from an energy security *** projected coking capacity is anticipated to experience a slight increase in the mid-term yet a significant decline in the long term,influenced by steel production *** potential future markets,COGtM is estimated to potentially capture a maximum market share of 16e34%in the methanol ***,against the backdrop of continuously expanding potential demand for hydrogen,COGtH holds advantages as a transitional solution,but in the long run,it can only meet a small portion of the *** can meet 7e14%of market demand and emerges as the most viable pathway from the viewpoint of balancing environmental and economic aspects and covering future markets.

关键词： Coke oven gas Life cycle assessment Economic analysis Comprehensive benefits Transformation strategy

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SERPINH1 promoted the proliferation and metastasis of colorectal cancer by activating PI3K/Akt/mTOR signaling pathway

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 1890-1907页

作者： xiao-Sheng Jin lu-xi Chen Ting-Ting Ji Rong-Zhou Li Department of Gastroenterology The Third Affiliated Hospital of Wenzhou Medical UniversityRuian 325000Zhejiang ProvinceChina

BACKGROUND Serpin peptidase inhibitor clade H member 1(SERPINH1)was initially recognized as an oncogene implicated in various human ***,the clinical relevance and functional implications of SERPINH1 in colorectal cancer(CRC)remain largely *** To investigate the effects of SERPINH1 on CRC cells and its specific *** Quantitative real-time polymerase chain reaction,western blotting analysis,The Cancer Genome Atlas data mining and immunohistochemistry were employed to examine SERPINH1 expression in CRC cell lines and tissues.A series of in-vitro assays were performed to demonstrate the function of SERPINH1 and its possible mechanisms in *** SERPINH1 demonstrated elevated expression levels in both CRC cells and tissues,manifested at both mRNA and protein *** SERPINH1 levels correlated closely with advanced T stage,lymph node involvement,and distant metastasis,exhibiting a significant association with poorer overall survival among CRC *** investigations unveiled that SERPINH1 overexpression notably bolstered CRC cell proliferation,invasion,and migration in vitro,while conversely,SERPINH1 knockdown elicited the opposite *** set enrichment analysis underscored a correlation between SERPINH1 upregulation and genes associated with cell cycle *** findings underscored the capacity of heightened SERPINH1 levels to expedite G1/S phase cell cycle progression via phosphatidylinositol 3-kinase/AKT/mechanistic target of rapamycin pathway activation,thereby facilitating CRC cell invasion and *** These findings imply a crucial involvement of SERPINH1 in the advancement and escalation of CRC,potentially positioning it as a novel candidate for prognostic assessment and therapeutic intervention in CRC management.

关键词： Serpin peptidase inhibitor clade H member 1 Colorectal cancer Proliferation Cell cycle Phosphatidylinositol 3-kinase/AKT/mechanistic target of rapamycin

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Tungsten pnictides for water electrolysis:advances and perspectives

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Tungsten 2024年第4期6卷 675-695页

作者： Xue Kang xi-Han Tan ning Han Jian-Feng Hou Chen-Min Yao Zhi-Jie Chen Bing-Jie ni Department of Chemistry and Chemical Engineering Lyuliang University Department of Materials Engineering State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of Education Hubei Key Laboratory of Stomatology School & Hospital of Stomatology Wuhan University School of Civil and Environmental Engineering The University of New South Wales

Hydrogen fuel is recognized as a promising energy carrier for the sustainable development of global energy system and the green hydrogen production via water electrolysis attracts great *** development of cost-effective electrocatalysts for water electrolysis is important for enhancing green hydrogen production ***,tungsten pnictides(phosphides and nitrides) have emerged as promising catalysts for water electrolysis,and efficient tungsten pnictide-based catalysts with different nanostructures,compositions,and surface chemical properties have been *** this review,recent progress in the design of tungsten pnictide-based electrocatalysts for water electrolysis is comprehensively *** synthesis of tungsten pnictide-based electrocatalysts are discussed ***,current achievements in developing efficient tungsten pnictide electrocatalysts for water electrolysis are detailed,and four key catalyst design strategies(i.e.,nanostructure control,heteroatom doping,defect engineering,and heterostructure design) are *** physicochemical properties-catalytic performance relationship of tungsten pnictide-based electrocatalysts is also *** last,perspectives in this field are put forward for guiding further research on the design and application of high-performance tungsten pnictide-based electrocatalysts.

关键词： Electrocatalysts Hydrogen evolution reaction Oxygen evolution reaction Tungsten nitrides Tungsten phosphides

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Toughened (Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B_(2)–SiC composites fabricated by one-step reactive sintering with a unique SiB_(6) additive

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Journal of Advanced Ceramics 2024年第1期13卷 86-100页

作者： Wei Hao xinzhe lu Ling Li Tao Wang Guoliang Ren Huangyue Cai xiaofeng Zhao Dongyun Wang Na ni Zhejiang Provincial Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology&Equipment Zhejiang Normal UniversityZhejiang 321004China Key Lab of Education Ministry for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

High-entropy diboride has been arousing considerable interest in recent ***,the low toughness and damage tolerance limit its applications as ultra-high-temperature structural *** we report that a unique SiB_(6) additive has been first incorporated as boron and silicon sources to fabricate a high-entropy boride(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B_(2)–SiC composite though one-step boro/carbothermal reduction reactive sintering.A synergetic effect of high-entropy sluggish diffusion and SiC secondary phase retarded the grain growth of the(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B_(2)–51SiC *** small grain size was beneficial to shorten the diffusion path for mass transport,thereby enhancing the relative density to~99.3%.These results in an increase of fracture toughness from~5.2 in HEBS-1900 to~7.7 MPa·m^(1/2) in HEBS-2000,which corresponded to a large improvement of 48%.The improvement was attributed to a mixed mode of intergranular and transgranular cracking for offering effective pinning in crack propagation,resulting from balanced grain boundary strength collectively affected by improved densification,solid solution strengthening,and incorporation of SiC secondary phase.

关键词： high-entropy diboride silicon hexaboride boro/carbothermal reduction reactive sintering fracture toughness

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Ferroelectric perovskite PbTiO_(3)for advanced photocatalysis

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Rare Metals 2024年第9期43卷 4038-4055页

作者： Shuang Zhao Shi-Shi Shen lu Han Bo-Chao Tian Na Li Wei Chen xi-Bao Li School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Department of Chemistry National University of SingaporeSingapore 117543Singapore

The ferroelectric semiconductor material PbTiO_(3)exhibits remarkable spontaneous polarization and photoelectric properties,positioning it as a promising polar *** internal electric field of ferroelectrics can separate photocarriers and enhance the catalytic performance of ***,when combined with other semiconductors,PbTiO_(3)contributes to the construction of a depolarization field,extending the catalytic applications of PbTiO_(3)***_(3)exhibits optical absorption,semiconductor,and piezoelectric *** piezoelectric polarization field enhances charge separation,modulates band structure,surface charge conduction,and heterojunction interface charge conduction,thereby amplifying photocatalytic *** paper begins by examining the structure,properties,and preparation methods of PbTiO_(3).Subsequently,it delves into the optimization of PbTiO_(3)'s structure and performance,exploring applications in photocatalysis as a ferroelectric *** is placed on the detailed discussion of surface modification,heterostructure formation,and ferroelectric polarization of PbTiO_(3)*** aspects are thoroughly explored for their role in regulating activity and optimizing the performance of photocatalysis and photopiezoelectric *** conclusion,the paper addresses the current research status of PbTiO_(3)ferroelectric materials and highlights the challenges that lie *** intention is to provide valuable references for the ongoing research in PbTiO_(3)ferroelectric materials.

关键词： PbTiO_(3) Ferroelectric polarization Photocatalysis Piezoelectric catalysis Polarization

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Oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)particles in the air:Nonisothermal kinetic and reaction mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1839-1848页

作者： Junyi xiang xi lu luwei Bai Hongru Rao Sheng Liu Qingyun Huang Shengqin Zhang Guishang Pei Xuewei Lü School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Rep.of Korea College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

High-temperature oxidation behavior of ferrovanadium(FeV_(2)O_(4))and ferrochrome(FeCr_(2)O_(4))spinels is crucial for the application of spinel as an energy material,as well as for the clean usage of high-chromium vanadium ***,the nonisothermal oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)prepared by high-temperature solid-state reaction was examined by thermogravimetry and X-ray diffraction(XRD)at heating rates of 5,10,and 15 K/*** apparent activation energy was determined by the Kissinger-Akahira-Sunose(KAS)method,whereas the mechanism function was elucidated by the Malek ***,in-situ XRD was conducted to deduce the phase transformation of the oxidation mechanism for FeV_(2)O_(4)and FeCr_(2)O_(4).The results reveal a gradual increase in the overall apparent activation energies for FeV_(2)O_(4)and FeCr_(2)O_(4)during *** stages of the oxidation process are observed based on the oxidation conversion rate of each *** oxidation mechanisms of FeV_(2)O_(4)and FeCr_(2)O_(4)are complex and have distinct *** particular,the chemical reaction controls the entire oxidation process for FeV_(2)O_(4),whereas that for FeCr_(2)O_(4)transitions from a three-dimensional diffusion model to a chemical reaction *** to the in-situ XRD results,numerous intermediate products are observed during the oxidation process of both compounds,eventually resulting in the final products FeVO_(4)and V2O_(5)for FeV_(2)O_(4)and Fe_(2)O_(3)and Cr_(2)O_(3)for FeCr_(2)O_(4),respectively.

关键词： FeV_(2)O_(4) FeCr_(2)O_(4) oxidation nonisothermal kinetics mechanism

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Heterogeneous bimetallic oxides/phosphides nanorod with upshifted d band center for efficient overall water splitting

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Chinese Chemical Letters 2024年第9期35卷 414-420页

作者： Ji Chen Yifan Zhao Shuwen Zhao Hua Zhang Youyu Long Lingfeng Yang Min xi Zitao ni Yao Zhou Anran Chen School of Materials and Energy Yunnan UniversityKunming 650091China School of Engineering The University of EdinburghSouth BridgeEdinburgh EH89YLUnited Kingdom Electron Microscopy Center Yunnan UniversityKunming 650091China School of Internet of Things Engineering Jiangnan UniversityWuxi 214122China

Electrocatalytic water splitting is the most directly available route to generate renewable and sustainable ***,we report the design of a composite material in which arrays of square pillar-like niMoO4nanorods coated with N,P-doped carbon layers are uniformly contained in numerous nested nanoparticle *** catalysts have superior catalytic activity,requiring only 59 mV and 187 mV for HER and OER to attain a current density of 10 mA/cm^(2),*** assembled two-electrode electrolytic cell required a voltage of 1.48 V to reach 10 mA/cm^(2),along with excellent long-term *** calculations reveal that electrons aggregate and redistribute at the heterogeneous interface,with the d-band centers of the ni and Fe atoms being positively shifted compared to the Fermi level,effectively optimizing the adsorption of intermediates and reducing the Gibbs free energy,thus accelerating the catalytic ***,an integrated solar-driven water-splitting system demonstrated a high and stable solar-to-hydrogen efficiency of 18.20%.This work provides new possibilities for developing non-precious metal-based bifunctional electrocatalysts for large-scale water splitting applications.

关键词： Hydrogen evolution reaction Bimetallic oxides Bimetallic phosphides Overall water splitting Solar-to-hydrogen efficiency

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Socioeconomic Impact and Response Strategies to the Multifaceted Respiratory Illness Outbreak in Northern China:Beyond Influenza A and Mycoplasma Pneumoniae

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China CDC weekly 2024年第36期6卷 934-938页

作者： xi Wang Rongfeng Zhou Ting Li Shuai Du Ayan Mao Wuqi Qiu Hongzhou lu Institute of Medical Information Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina Department of Infectious Diseases National Clinical Research Center for Infectious DiseasesThe Third People’s Hospital of ShenzhenShenzhen CityGuangdong ProvinceChina.

This study examines the socioeconomic and public health effects of a recent respiratory illness outbreak in northern China,focusing on Beijing following the lifting of coronavirus disease 2019(COVID-19)*** analyzes the implications of increased influenza A(H3N2)and Mycoplasma pneumoniae cases on urban health systems and economic *** mixed-methods study integrated a review of academic and governmental literature,a quantitative analysis of public health data,and a qualitative assessment of response *** indicate a significant increase in respiratory illnesses in late 2023,prompting a proactive response from health authorities that involved expanded hospital capacity and intensified ***,including resource limitations and public health fatigue,persisted,affecting response *** outbreak management was achieved through immediate health responses,although the event highlighted the need for improved infrastructure,surveillance,and policy *** emphasize the importance of international collaboration and comprehensive preparedness plans to strengthen global health security for future epidemics.

关键词： intensified lifting prompt

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