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Chinese Journal of Chemical Engineering 2024年第3期67卷 1-8页

作者： Wei Guo Yan Zhang Xiaxin Lei shuang Wang College of Physics Taiyuan University of TechnologyJinzhong 030600China College of Environmental science and Engineering Taiyuan University of TechnologyJinzhong 030600China shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China

In this work,a new ZnO/CoNiO_(2)/CoO/C metal oxides composite is prepared by cost-effective hydrothermal method coupled with annealing process under N_(2) ***,the oxidation-defect annealing environment is conducive to both morphology and component of the composite,which flower-like ZnO/CoNiO_(2)/CoO/C is *** from good chemical stability of ZnO,high energy capacity of CoNiO_(2) and CoO and good conductivity of C,the as-prepared sample shows promising electrochemical behavior,including the specific capacity of 1435 C·g^(-1) at 1 A·g^(-1),capacity retention of 87.3%at 20 A·g^(-1),and cycling stability of 90.5%for 3000 cycles at 5 A·g^(-1),***,the prepared ZnO/CoNiO_(2)/CoO/C/NF//AC aqueous hybrid supercapacitors device delivers the best specific energy of 55.9 W·h·kg^(-1) at 850 W·kg^(-1).The results reflect that the as-prepared ZnO/CoNiO_(2)/CoO/C microflowers are considered as high performance electrode materials for supercapacitor,and the strategy mentioned in this paper is benefit to prepare mixed metal oxides composite for energy conversion and storage.

关键词： Composites Electrochemistry Hydrothermal Transition metal oxides structural control supercapacitors

Jackson-type inequalities on high-dimensional spheres

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science china Mathematics 2024年第11期67卷 2571-2586页

作者： Yeli Niu Feng Dai Department of Mathematics Shanghai Normal University Department of Mathematical and statistical sciences University of Alberta

We study Jackson's inequality on high-dimensional spheres with respect to the modulus of smoothness defined via the rotation *** obtain a version of Jackson's inequality with a dimensionfree constant,extending Newman and shapiro's well-known results in 1964 from the case of r = 1 and p = ∞ to more general *** results partially overcome the curse of *** also establish similar results on the equivalence of the K-functional and modulus of smoothness.

关键词： modulus of smoothness $K$-functional Jackson's inequality high-dimensional approximation

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Experimental study on the size effect on the equation of state of concretes under shock loading

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Defence Technology（防务技术） 2024年第3期33卷 160-167页

作者： Mei Li Jian Cui Yanchao shi Baijian Tang Xin Chen Key Laboratory of Coast Civil structural safety of the Ministry of Education Tianjin UniversityTianjin 300072China school of Civil Engineering Suzhou University of Science and Technology1701 Binhe RoadSuzhou 215011JiangsuChina school of Civil Engineering Tianjin UniversityTianjin 300072China

Adopting the classical theory of hydrocodes,the constitutive relations of concretes are separated into an equation of state(Eos)which describes the volumetric behavior of concrete material and a strength model which depicts the shear properties of *** experiments on the Eos of concrete is always challenging due to the technical difficulties and equipment limitations,especially for the specimen size effect on the *** some researchers investigate the shock properties of concretes by fly-plate impact tests,the specimens used in their tests are usually in one *** this paper,the fly-plate impact tests on concrete specimens with different sizes are performed to investigate the size effect on the shock properties of concrete *** mechanical background of the size effect on the shock properties are revealed,which is related to the lateral rarefaction effect and the deviatoric stress produced in the *** to the tests results,the modified Eos considering the size effect on the shock properties of concrete are proposed,which the bulk modulus of concrete is unpredicted by up to 20% if size effects are not accounted for.

关键词： Concrete Equation of state size effect shock wave Fly-plate impact test

Emergent symmetry in quantum phase transition:From deconfined quantum critical point to gapless quantum spin liquid

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science Bulletin 2024年第2期69卷 190-196页

作者： Wen-Yuan Liu shou-shu Gong Wei-Qiang Chen Zheng-Cheng Gu Department of Physics The Chinese University of Hong KongHong KongChina Division of Chemistry and Chemical Engineering California Institute of TechnologyPasadena CA 91125USA school of Physical sciences Great Bay UniversityDongguan 523000China Great Bay Institute for Advanced study Dongguan 523000China Department of Physics and shenzhen Institute for Quantum science and Engineering Southern University of Science and TechnologyShenzhen 518055China shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The emergence of exotic quantum phenomena in frustrated magnets is rapidly driving the development of quantum many-body physics,raising fundamental questions on the nature of quantum phase *** we unveil the behaviour of emergent symmetry involving two extraordinarily representative phenomena,i.e.,the deconfined quantum critical point(DQCP)and the quantum spin liquid(QsL)*** large-scale tensor network simulations,we study a spatially anisotropic spin-1/2 square-lattice frustrated antiferromagnetic(AFM)model,namely the J1x-J1y-J2 model,which contains anisotropic nearestneighbor couplings J1x,J1y and the next nearest neighbor coupling *** small J1y/J1x,by tuning J2,a direct continuous transition between the AFM and valence bond solid phase is *** growing J1y/J1x,a gapless QsL phase gradually emerges between the AFM and VBs *** observe an emergent O(4)symmetry along the AFM–VBs transition line,which is consistent with the prediction of DQCP *** surprisingly,we find that such an emergent O(4)symmetry holds for the whole QsL–VBs transition line as *** findings reveal the intrinsic relationship between the QsL and DQCP from categorical symmetry point of view,and strongly constrain the quantum field theory description of the QsL *** phase diagram and critical exponents presented in this paper are of direct relevance to future experiments on frustrated magnets and cold atom systems.

关键词： Tensor network Quantum phase transition Emergent symmetry Quantum spin liquid Deconfined quantum critical point Anisotropic

Effect of simulated gastrointestinal digestion on antioxidant,and anti-inflammatory activities of bioactive peptides generated in sausages fermented with staphylococcus simulans QB7

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Food science and Human Wellness 2024年第3期13卷 1662-1671页

作者： Hongying Li Hongbing Fan Zihan Wang Qiujin Zhu Jianping Wu Laboratory of Animal Genetics Breeding and Reproduction in the Plateau Mountainous RegionMinistry of EducationCollege of Life SciencesGuizhou UniversityGuiyang 550025China Department of Agricultural Food and Nutritional ScienceUniversity of AlbertaAlberta T6G 2P5Canada Department of Animal and Food sciences University of KentuckyLexington 40546United States school of Liquor and Food Engineering Guizhou UniversityGuiyang 550025China

Dry-fermented sausages are a good source of bioactive peptides,whose stability against gastrointestinal(GI)digestion determines their *** study focused on evaluating the effect of peptide extracts from sausages fermented with staphylococcus simulans QB7 during in vitro simulated GI digestion,including peptide profiles and antioxidant and anti-inflammatory *** present in sausages were degraded during digestion,with molecular weight reduced from>12 kDa tos increased from 381.15 to 527.07 mg/g,especially tyrosine being found only after GI *** anti-inflammatory activities were increased after GI digestion,however,the changes in antioxidant activities were the opposite.A total number of 255,252 and 386 peptide sequences were identified in undigested,peptic-digested and GI-digested samples,***,BIOPEP-UWM and admetsAR were used to further predict the functional properties and intestinal absorption of the identified peptide sequences from GI ***,18 peptides were discovered to possess either antioxidant or anti-inflammatory capacities.

关键词： Gastrointestinal digestion sausages Bioaccessibility Anti-inflammatory activities

Multiple Nanoparticles Coupling strategy for Enhancing Optical Filter Performance of spectral splitter Used in Photovoltaic/Thermal system

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Journal of Thermal science 2024年第1期33卷 368-382页

作者： LIANG Huaxu HUANG Xin WANG Fuqiang CHENG Ziming DONG Yan school of Energy science and Engineering Harbin Institute of TechnologyHarbin 150001China school of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China school of Materials science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

selective absorptive nanofluid can pre-absorb certain sunlight wavelength that cannot be used by PV and transmits remaining sunlight to the surface of PV,which can decouple PV from the thermal receiver *** order to improve the harvesting of electricity and high-temperature thermal nanofluid,it is important to design an optimal optical filter window(transmit sunlight with wavelengths of 732-1067 nm to the surface of the photovoltaic cell and absorb the remaining sunlight).However,designing optimal optical filter is facing following challenges:(1) inherently narrow selective absorptivity property of single nanoparticle;(2) simplified numerical calculation method calculating transmittance;(3) ignoring the shape of the *** this study,the idea of using multiple nanoparticles coupling effect to design an optical filter is proposed,which can superimpose the narrow absorption bandwidth of different nanoparticles to obtain a wide absorption bandwidth of the whole *** addition,an improved transmission method considering light-matter interaction at air/vessel and liquid/vessel interfaces is adopted to compute the *** results calculated by improved transmission method are more accurate than widely used traditional Lambert-Beer law,which is verified by experimental ***,the effect of nanoparticle shape on spectral transmittance is also investigated,which shows that spiny Ag can approximately extend absorbance from 400 nm to 600 nm compared to nanosphere ***,the results show that optical filter efficiency of nanofluids with multiple nanoparticles coupling(Ag,spiny Ag,ZnO,ITO) can reached up to 35%.

关键词： solar energy PV/T nanofluid optimal optical filter radiative transfer spectral splitting

Maximizing submodular+supermodular Functions subject to a Fairness Constraint

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Tsinghua science and Technology 2024年第1期29卷 46-55页

作者： Zhenning Zhang Kaiqiao Meng Donglei Du Yang Zhou Beijing Institute for scientific and Engineering Computing Beijing University of TechnologyBeijing 100124China Faculty of Management University of New BrunswickFredericton E3B 5A3Canada school of Mathematics and statistics Shandong Normal UniversityJinan 250014China

We investigate the problem of maximizing the sum of submodular and supermodular functions under a fairness *** sum function is non-submodular in *** an offline model,we introduce two approximation algorithms:A greedy algorithm and a threshold greedy *** a streaming model,we propose a one-pass streaming *** also analyze the approximation ratios of these algorithms,which all depend on the total curvature of the supermodular *** total curvature is computable in polynomial time and widely utilized in the literature.

关键词： submodular function supermodular function fairness constraint greedy algorithm threshold greedy algorithm streaming algorithm

Adhesion Performances Between Two Orthotropic solids Influenced by Temperature Increment

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Acta Mechanica solida sinica 2024年第3期37卷 430-443页

作者： Qing-Hui Luo Yue-Ting Zhou school of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai200092China

The classical adhesive contact models belong to isothermal adhesion theories,where the effect of temperature on adhesion was ***,a number of experimental results indicated that the adhesion behaviors can be significantly affected by *** this paper,the two-dimensional non-slipping anisothermal adhesion behaviors between two orthotropic elastic cylinders are investigated within the framework of the Johnson-Kendall-Roberts *** stated problem is reduced to the coupled singular integral equations by virtue of the Fourier integral transform,which are solved analytically with the analytical function *** closed-form solutions for the stress fields in the presence of thermoelastic effect are *** stable equilibrium state of contact system is determined by virtue of the Griffith energy *** effect of temperature difference on adhesion behaviors between orthotropic solids is *** is found that the difference between the oscillatory and non-oscillatory solutions increases with increasing the degree of anisotropy of orthotropic *** oscillatory solution cannot be well approximated by the non-oscillatory solution for the orthotropic materials with relatively high anisotropy.

关键词： Adhesive contact Non-slipping JKR model Temperature Griffith energy balance

small-signal stability Criteria in Power Electronics-dominated Power systems:A Comparative Review

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Journal of Modern Power systems and Clean Energy 2024年第4期12卷 1003-1018页

作者： Qifan Chen siqi Bu Chi Yung Chung Department of Electrical and Electronic Engineer The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical and Electronic Engineering Shenzhen Research InstituteCentre for Grid ModernisationInternational Centre of Urban Energy NexusCentre for Advances in Reliability and SafetyResearch Institute for Smart Energyand Policy Research Centre for Innovation and TechnologyThe Hong Kong Polytechnic UniversityHong KongChina

To tackle emerging power system small-signal stability problems such as wideband oscillations induced by the large-scale integration of renewable energy and power electronics,it is crucial to review and compare existing small-signal stability analysis *** this basis,guidance can be provided on determining suitable analysis methods to solve relevant small-signal stability problems in power electronics-dominated power systems(PEDPss).Various mature methods have been developed to analyze the small-signal stability of PEDPss,including eigenvalue-based methods,Routh stability criterion,Nyquist/Bode plot based methods,passivity-based methods,positive-net-damping method,lumped impedance-based methods,bifurcation-based methods,*** this paper,the application conditions,advantages,and limitations of these criteria in identifying oscillation frequencies and stability margins are reviewed and compared to reveal and explain connections and discrepancies among ***,efforts are devoted to mathematically proving the equivalence between these small-signal stability ***,the performance of these criteria is demonstrated and compared in a 4-machine 2-area power system with a wind farm and an IEEE 39-bus power system with 3 wind farms.

关键词： Impedance-based method oscillation analysis power electronic converter power electronics-dominated power system renewable power generation small-signal stability

Meiotic transcriptional reprogramming mediated by cell-cell communications in humans and mice revealed by scATACseq and scRNA-seq

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Zoological research 2024年第3期45卷 601-616页

作者： Hai-Quan Wang Xiao-Long Wu Jing Zhang si-Ting Wang Yong-Juan sang Kang Li Chao-Fan Yang Fei sun Chao-Jun Li state Key Laboratory of Reproductive Medicine and Offspring Health Center for Global HealthSchool of Public HealthNanjing Medical UniversityNanjingJiangsu 211166China Medical school Nanjing UniversityNanjingJiangsu 210093China Zhejiang University school of Medicine HangzhouZhejiang 310016China Department of Urology and Andrology Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhouZhejiang 310000China Model Animal research Center of Medical school Nanjing UniversityNanjingNanjingJiangsu 210093China Liangzhu Laboratory Zhejiang UniversityHangzhouZhejiang 311121China

Meiosis is a highly complex process significantly influenced by transcriptional ***,studies on the mechanisms that govern transcriptomic changes during meiosis,especially in prophase I,are ***,we performed single-cell ATAC-seq of human testis tissues and observed reprogramming during the transition from zygotene to pachytene *** event,conserved in mice,involved the deactivation of genes associated with meiosis after reprogramming and the activation of those related to spermatogenesis before their functional ***,we identified 282 transcriptional regulators(TRs)that underwent activation or deactivation subsequent to this *** suggested that physical contact signals from sertoli cells may regulate these TRs in spermatocytes,while secreted ENHO signals may alter metabolic patterns in these *** results further indicated that defective transcriptional reprogramming may be associated with non-obstructive azoospermia(NOA).This study revealed the importance of both physical contact and secreted signals between sertoli cells and germ cells in meiotic progression.

关键词： single-cell RNA-seq single-cell ATAC-seq spermatogenesis Meiosis Transcriptional reprogramming Cell-cell communication