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Composition Engineering Opens an Avenue Toward Efficient and Sustainable Nitrogen Fixation

Energy & Environmental Materials 2024年第1期7卷 313-325页

作者： xiaolin wang Liming Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationWuhan 430074China Hubei Key Laboratory of Materials Chemistry and Service Failure Wuhan 430074China Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Wuhan 430074China Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Wuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

In this work,we open an avenue toward rational design of potential efficient catalysts for sustainable ammonia synthesis through composition engineering strategy by exploiting the synergistic effects among the active sites as exemplified by diatomic metals anchored graphdiyne via the combination of hierarchical high-throughput screening,first-principles calculations,and molecular dynamics *** 43 highly efficient catalysts feature ultralow onset potentials(|U_(onset)|≤0.40 V)with Rh-Hf and Rh-Ta showing negligible onset potentials of 0 and-0.04 V,*** high catalytic activities of Rh-Hf and Rh-Ta can be ascribed to the synergistic *** forming heteronuclears,the combinations of relatively weak(such as Rh)and relatively strong(such as Hf or Ta)components usually lead to the optimal strengths of adsorption Gibbs free energies of reaction *** origin can be ascribed to the mediate d-band centers of Rh-Hf and Rh-Ta,which lead to the optimal adsorption strengths of intermediates,thereby bringing the high catalytic *** work provides a new and general strategy toward the architecture of highly efficient catalysts not only for electrocatalytic nitrogen reduction reaction(eNRR)but also for other important *** expect that our work will boost both experimental and theoretical efforts in this direction.

关键词： composition engineering strategy diatomic catalysts electrocatalytic nitrogen reduction reaction first-principles calculations graphdiyne hierarchical high-throughput screening synergistic effects

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Dissolvable temporary barrier:a novel paradigm for flexible hydrogel patterning in organ-on-a-chip models

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Bio-Design and Manufacturing 2024年第2期7卷 153-166页

作者： Ding wang Qinyu Li Chenyang Zhou Zhangjie Li Kangyi Lu Yijun Liu Lian Xuan xiaolin wang Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Ophthalmology LKS Faculty of MedicineThe University of Hong KongHong Kong 999077China Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Shanghai Jiao Tong UniversityShanghai 200240China National Center for Translational Medicine(Shanghai)SHU Branch Shanghai UniversityShanghai 200444China

A combination of hydrogels and microfluidics allows the construction of biomimetic three-dimensional(3D)tissue models in vitro,which are also known as *** hydrogel patterningwith awell-controlled spatial distribution is typically achieved by embedding sophisticated microstructures to act as a ***,these physical barriers inevitably expose cells/tissues to a less physiologically relevant microenvironment than in vivo ***,we present a novel dissolvable temporary barrier(DTB)strategy that allows robust and flexible hydrogel patterning with great freedom of design and desirable flow stimuli for cellular *** key aspect of this approach is the patterning of a water-soluble rigid barrier as a guiding path for the hydrogel using stencil printing technology,followed by a barrier-free medium perfusion after the dissolution of the *** and multiple tissue compartments with different geometries can be established using either straight or curved DTB *** effectiveness of this strategy is further validated by generating a 3D vascular network through vasculogenesis and angiogenesis using a vascularized microtumor *** a new proof-of-concept in vasculature-on-a-chip,DTB enables seamless contact between the hydrogel and the culture medium in closed microdevices,which is an improved protocol for the fabrication ofmultiorgan ***,we expect it to serve as a promising paradigm for organ-on-a-chip devices for the development of tumor vascularization and drug evaluation in the future preclinical studies.

关键词： Dissolvable temporary barrier Hydrogel patterning Microfluidics Organ-on-a-chip Vascularization

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Three-parameter approximations of sums of locally dependent random variables via Stein's method

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Science China Mathematics 2024年

作者： Zhonggen Su xiaolin wang School of Mathematical Sciences Zhejiang University

Let,{Xi,i ∈ J} be a family of locally dependent non-negative integer-valued random variables with finite expectations and *** consider the sum W=∑i∈jXiand apply Stein's method to establish general upper error bounds for the total variation distance dTV（W,M）,where M represents a threeparameter random *** a direct consequence,we obtain a discretized normal approximation for *** applications,we study four well-known examples in detail:counting vertices where all edges point inward,the birthday problem,counting monochromatic edges in uniformly colored graphs,and triangles in the Erd?s-Renyi random *** delicate analysis and computation,we obtain sharper upper error bounds than existing results.

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Balancing Openness and Protection:Homogenization of Regulatory Laws in Digital Service Trade

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China Finance and Economic Review 2024年第2期13卷 67-89页

作者： Cuihong Yang xiaolin wang Huijuan wang Yan Xia Academy of Mathematics and Systems Science Chinese Academy of Sciences(CAS) School of Economics and Management University of Chinese Academy of Sciences(UCAS) Academy of Mathematics and Systems Science CASand School of Economics and ManagementUCAS School of Statistics and Mathematics Central University of Finance and Economics. Institutes of Science and Development CAS School of Public Policy and Management UCAS

Digital service trade has emerged as a pivotal engine for global economic transformation and ***,the implementation of differentiated regulatory measures for trade in digital services among economies has led to increasingly frequent trade *** paper constructs a regulatory homogeneity network for digital service trade in 60 major economies,and systematically evaluates the structural characteristics of the network and the regulatory homogeneity among economies from 2014 to ***,this paper empirically examines the impact of the partnership characteristics of regulatory homogenization in the network of major economies on their *** analysis of the network structure shows that major economies are more inclined to optimize and simplify existing trade partnerships,and are moving towards more diversified restrictive measures in the regulatory model of digital services trade,which has led to the rise of trade *** empirical text results show that expanding and deepening the regulatory homogeneous partnership of trade in digital services promotes the export of digital services in major *** promotion effect is mainly achieved by reducing the cost of digital service trade and enhancing business *** addition,the export promotion effect of developing regulatory homogenization partnerships is better than that of increasing the openness of digital service trade,and the homogenization of policies between openness and protection is more *** paper provides important implications for coordinating the openness and security of digital services trade:China should actively cooperate with multilateral and bilateral digital service trade partners to jointly build a homogeneous environment for regulatory *** particular,it is necessary to deepen the regulatory homogeneity partnership with Asian and developing economies to expand the infl uence of the“China model”in the global regulation of digital s

关键词： digital service trade regulatory cooperation regulatory homogenization partnerships high-quality trade development

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Paleoenvironmental Characteristics of Paleogene Lacustrine Source Rocks in the Western Bozhong Sag,Bohai Bay Basin,China:Evidence from Biomarkers,Major and Trace Elements

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 220-240页

作者： wang Xiang LIU Guangdi SONG Zezhang SUN Mingliang wang xiaolin wang Feilong CHEN Rongtao GENG Mingyang LI Yishu State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Geosciences China University of PetroleumBeijing 102249China China National Offshore Oil Co. Ltd.(CNOOC)Tianjin Branch CompanyTianjin 300459China CNOOC Research Institute Beijing 100028China

The organic matter(OM)enrichment mechanisms and depositional environment characteristics of lacustrine source rocks in the western Bozhong Sag,Bohai Bay Basin in Northeast China remain *** address these issues,based on Rock-Eval pyrolysis,kerogen macerals,H/C and O/C ratios,GC-MS,major and trace elements,the Dongying Formation Member(Mbr)3(E_(3)d_(3)),the Shahejie Formation mbrs 1 and 2(E_(2)s_(1+2)),and the Shahejie Mbr 3(E_(2)s_(3))source rocks in the western Bozhong Sag were *** above methods were used to reveal their geochemical properties,OM origins and depositional environments,all of which indicate that E_(2)s_(1+2)and E_(2)s_(3)are excellent source rocks,and that E_(3)d_(3)is of the second good quality.E_(3)d_(3)source rocks were formed under a warm and humid climate,mainly belong to fluvial/delta facies,the E_(3)d_(3)sediments formed under weakly oxidizing and freshwater ***,the depositional environments of E_(2)s_(1+2)source rocks were arid and cold climate,representing saline or freshwater lacustrine facies,and the sediments of E_(2)s_(1+2)belong to anoxic or suboxic settings with large evaporation and *** the period of E_(2)s_(3),the climate became warm and humid,indicating the freshwater lacustrine facies,and E_(2)s_(3)was characterized by freshwater and abundant ***,compared with other intervals,the OM origin of E_(3)d_(3)source rocks has noticeable terrestrial *** OM origin of the E_(2)s_(1+2)and E_(2)s_(3)are mainly plankton and *** subsidence and climate change have affected the changes of the depositional environment in the western Bozhong Sag,thus controlling the distribution of the source rocks,the geochemical characteristics in the three intervals of lacustrine source rocks have distinct ***,these factors are effective to evaluate the paleoenvironmental characteristics of source rocks by biomarkers,major and trace *** established models

关键词： petroleum geology source rocks depositional environments biomarkers major elements trace elements Bozhong Sag

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Boosting the zinc storage performance of vanadium dioxide by integrated morphology engineering and carbon nanotube conductive networks

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Nano Research 2024年第8期17卷 7136-7143页

作者： Lijie Ma xiaolin wang Xiang Chen Jianbin Gao Yiwen wang Yuehai Song Yaran Zhao Shizhe Gao Lin Li Jianchao Sun School of Environment and Material Engineering Yantai UniversityYantai 264005China College of Textile Science and Engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China BNU-HKUST Laboratory of Green Innovation Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Vanadium dioxide(VO_(2)) with the advantages of high theoretical capacity and tunnel structure has attracted considerable promising candidates for aqueous zinc-ion ***,the intrinsic low electronic conductivity of VO_(2) results in an unsatisfactory electrochemical ***,a flower-like VO_(2)/carbon nanotubes(CNTs)composite was obtained by a facile hydrothermal *** unique flower-like morphology shortens the ion transport length and facilitates electrolyte ***,the CNT conductive networks is in favor of fast electron transfer.A highly reversible zinc storage mechanism was revealed by ex-situ X-ray diffraction and X-ray photoelectron *** a result,the VO_(2)/CNTs cathode exhibits a high reversible capacity(410 mAh·g^(−1)),superior rate performance(305 mAh·g^(−1)at 5 A·g^(−1)),and excellent cycling stability(a reversible capacity of 221 mAh·g^(−1)was maintained even after 2000 cycles).This work provides a guide for the design of high-performance cathode materials for aqueous zinc metal batteries.

关键词： VO_(2)/carbon nanotubes morphology engineering zinc metal batteries cathode materials conductive networks

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Experimental determination of heat generation rates of lithium-ion batteries by thermal protection method

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Science China Technological Sciences 2024年

作者： SHI JingHe ZHANG HengYun YU Hong wang xiaolin School of Mechanical and Automotive Engineering Shanghai University of Engineering Science School of Engineering University of Tasmania

Experimental determination of heat generation rates is crucial in the thermal safety design of automotive batteries. A thermal protection method(TPM) is proposed to determine the heat generation rates of 18650 cylindrical lithium-ion batteries under different discharge rates. The physical model based on the thermal protection method is established, and its feasibility is demonstrated through theoretical analysis. In the experimental setup, by introducing lateral thermal protection batteries(TPB) to minimize the heat loss of the center test battery(CTB), heat generation rates of the battery can be obtained based on the temperature change of the CTB. The average heat generation rates of the battery at 1, 2, and 3 C discharge rates are found to be0.255, 0.844, and 1.811 W, respectively, which can be quadratically correlated with the discharge rate. In addition, a benchmark test of the present measurement against the commonly used accelerating rate calorimeter(ARC) was conducted. Relatively small deviations of 3.77%, 4.20%, and 1.09% were identified in the heat generation rates for the discharge rates at 1, 2, and 3 C. In comparison with the ARC equipment, the present TPM can be more representative of the transient battery heat generation characteristics with a much shorter time for thermal equalization. Finally, to further verify the accuracy of the present method,standard samples of the same size as the actual battery were made, which were capable of controlling heat generation through a direct current power supply. A comparison of the heat inputs of the standard sample with the heat generation rates measured by the thermal protection method shows a relative deviation of 1.01% maximum. With high measurement accuracy and an easy-tobuild experimental setup, the proposed method has promising prospects in automotive applications.

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Selenium nanoparticles in aquaculture:Unique advantages in the production of Se-enriched grass carp(Ctenopharyngodon idella)

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Animal Nutrition 2024年第1期16卷 189-201页

作者： Chao Zhu Zifang Wu Qimin Liu xiaolin wang Lijuan Zheng Shuyang He Fangxia Yang Hong Ji Wuzi Dong College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi712100China College of Forestry Northwest A&F UniversityYanglingShaanxi712100China Biology Research Centre of Qin Mountains Wildlife Northwest A&F UniversityYanglingShaanxi712100China

The production of selenium-enriched fish can contribute to alleviating selenium deficiency in human ***,it is still unclear which selenium source,as an additive,can efficiently and costeffectively produce high-quality selenium-enriched *** study evaluated the effects of selenium nanoparticles(SeNP),selenite,and selenomethionine(SeMet)on the growth,antioxidant capacity,selenium content,selenium speciation,and meat quality of grass *** diets were prepared,including a basal diet(BD)and three concentrations(0.1,0.3,and 0.9 mg/kg)of SeNP,selenite,and SeMet.A total of600 fish(250.79±1.57 g)were randomly assigned to 30 tanks(3 tanks/group).Fish were fed the experimental diet three times daily for 60 *** this study,SeNP most significantly promoted the growth and antioxidant capacity of grass carp,with 0.3 mg/kg SeNP identified as the optimal additive ***,SeNP demonstrated equally excellent bioavailability as SeMet and significantly increased the content of SeMet in grass carp(Ctenopharyngodon idella)***,compared to SeMet and selenite,dietary SeNP could more significantly enhance the content of selenocysteine(SeCys2)and methylselenocysteine(MeSeCys)in grass carp muscle *** addition,we have demonstrated that SeCys2and MeSeCys promote apoptosis of cancer cells(HeLa)through the mitochondrial apoptotic pathway(involving Bax and Bcl-2).Furthermore,as an additive,0.3 mg/kg SeNP significantly improved the flesh quality of grass carp by reducing crude fat and heavy metal content,as well as increasing the levels of eicosapentaenoic acid(EPA)and docosahexaenoic acid(DHA)and the ratio of n-3/n-6 polyunsaturated fatty acid(PUFA).In summary,SeNP is the most suitable additive for producing selenium-enriched fish.

关键词： Selenium nanoparticle Speciation analysis Grass carp Selenium additive

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Heterogeneous characteristics of various lamina assemblage in shale of Shahejie Formation of the Zhanhua Sag， Bohai Bay Basin， eastern China

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Journal of Earth Science 2024年

作者： xiaolin wang Xiaomin Zhu Jin Lai Xingyue Lin Yushan Du Yurui Zhu National Key Laboratory of Petroleum Resources and Engineering， China University of Petroleum College of Geosciences， China University of Petroleum Beijing Sinopec Shengli Oilfield Company

The Eocene Shahejie Formation in the Zhanhua Sag of the Bohai Bay Basin has abundant shale oil resources. However， lacustrine shale is heterogeneous in mineralogy， sedimentary structure， organic matter， pore structure， paleoenvironment， and oil content. Therefore， the laminae assemblages are divided into laminated （lamina thickness of 0.1 m） types shale to investigate the core， X-ray diffraction （XRD）， thin section， field emission-scanning electron microscopy （FE-SEM）， mercury injection capillary pressure （MICP）， N2adsorption and geochemical experiments. The results show that the oil shale of Shahejie Formation in Zhanhua Sag is abundant in calcite. The TOC content ranges between 1.35% and 5.55%. Rock-Eval S1and S2values range from 0.30 to 2.56 mg/g and 0.97～15.47 mg/g， respectively. Variable kinds of nanopores， micropores， and microfractures are commonly observed. The connectivity of pores in laminated and layered shale samples is relatively better than massive shale. The massive shale was formed in a sedimentary environment with warm and humid climate， moderate salinity， weak reduction conditions， high productivity， and paleo-setting rate. Organic matter is derived from lower bacteria， algae， and terrigenous plants. Laminated and layered shale are formed in an arid and cold environment with high salinity， strong reducibility， low paleo-setting rate. Laminated shale is located on a gentle slope at the basin margin， which is the focus of shale oil exploration because of their higher hydrocarbon generation potential， reservoir quality， and advantaged horizontal fracturing conditions. The above results have implication for the sweet spots prediction in shales with similar geological setting.

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Rational design of a single-component mRNA vaccine against orthopoxvirus and SARS-CoV-2

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Science China(Life Sciences) 2024年第6期67卷 1311-1313页

作者： Yilong Yang Xiaofan Zhao Yu Li Xiaodong Zai Xinyi wang Yue Zhang xiaolin wang Peng Lv Jun Zhang Lihua Hou Junjie Xu Wei Chen Laboratory of Advanced Biotechnology Beijing Institute of BiotechnologyAcademy of Military Medical SciencesBeijing 100071China

Dear Editor,In the era of COVID-19,the prevalence of viruses from other families poses new threats to *** the eradication of smallpox in 1980,the global outbreak of monkeypox in 2022(Lum et al.,2022;Nuzzo et al.,2022)alerted that the re-emerging orthopoxvirus(OPXV)remained a persistent threat to global *** includes a number of viruses with a broad host range,including variola virus(VARV),monkeypox virus(MPXV),vaccinia virus(VACV).

关键词： vaccine Rational

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