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Trial application of the envelope method to the potential ambiguity problem

Nuclear Science and Techniques 2024年第1期35卷 73-80页

作者： Li-yuan hu Yu-Shou Song Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China College of Nuclear Science and Technology Harbin Engineering UniversityHarbin 150001China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information TechnologyHarbin 150001China

The optical potential ambiguity is a long-standing problem in the analysis of elastic scattering *** a specific collid-ing system,ambiguous potential families can lead to different behaviors in the nearside and farside scattering *** contrast,the envelope method can decompose the experimental data into two components with negative and positive deflection angles,***,a question arises as to whether the comparison between the calculated nearside(or farside)component and the derived positive-deflection-angle(or negative-deflection-angle)component can help analyze the potential ambiguity *** this study,we conducted a trial application of the envelope method to the potential ambiguity *** envelope method was improved by including uncertainties in the experimental *** colliding systems of 16O+28Si at 215.2 MeV and 12C+12C at 1016 MeV were considered in the *** each colliding system,the angular distribution experimental data were described nearly equally well by two potential sets,one of which is“surface transpar-ent”and the other is *** calculated angular distributions were decomposed into nearside and farside scattering *** the improved envelope method,the experimental data were decomposed into the positive-deflection-angle and negative-deflection-angle components,which were then compared with the calculated nearside and farside *** capability of the envelope method to analyze the potential ambiguities was also discussed.

关键词： Elastic scattering Optical potential ambiguities Envelope method Nearside/farside decomposition

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Effect of strain-gradients of surface micro-beams on frequency-shift of a quartz crystal resonator under thickness-shear vibrations

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Acta Mechanica Sinica 2015年第5期31卷 647-652页

作者： Ling-Cheng Kong yuan-Tai hu Department of Mechanics Huazhong University of Science and Technology

With introduction of the first-order strain-gradient of surface micro-beams into the energy density function,we developed a two-dimensional dynamic model for a compound quartz crystal resonator（QCR） system,consisting of a QCR and surface micro-beam *** frequency shift that was induced by micro-beams with consideration of strain-gradients is discussed in detail and some useful results are obtained,which have important significance in resonator design and applications.

关键词： Micro-beams Strain-gradient Quartz crystal resonator Frequency shift

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Compensation in Intermittency Strength of the Hard and Soft Components in Hadron-Hadron Collisions

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Chinese Physics Letters 1994年第10期11卷 597-600页

作者： hu yuan LIU Lianshou Institute of Particle Physics Huazhong Normal UniversityWuhan 430070

The controversy in experimental data on the transverse momentum dependence of intermittency at different energies is *** is shown that this controversy is due to the appearance of a new component-the jet(or mini-jet)component together with the normal soft one at the collider *** is shown that the compensation effect of these two components results in a U shape for the dependence of intermittency indices on the average transverse momentum per event P_(⊥)which is a good quantity to characterize the relative size of soft and hard components in an *** a linearization approximation the fraction of the soft component can be determined directly from P_(⊥).

关键词： momentum transverse linearization

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Intrinsically Anti-Flammable Apigenin-derived Epoxy Thermosets with High Glass Transition Temperature and Mechanical Strength

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Chinese Journal of Polymer Science 2022年第10期40卷 1259-1268,I0011页

作者： Hafezeh Nabipour Xin Wang Lei Song yuan hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

In this work,apigenin was chosen as a raw material to synthesize a novel epoxy monomer(DGEA),while the bio-based epoxy resin was further obtained after curing with 4,4’-diaminodiphenylmethane(DDM).The control samples were prepared by curing diglycidyl ether of bisphenol A(DGEBA)with *** non-isothermal differential scanning calorimeter(DSC)method was utilized to further investigate the curing behavior and curing kinetics of the DGEA/DDM *** no flame retardant active elements,the DGEA/DDM thermoset still exhibited exceptional ***,the DGEA/DDM thermoset reached a V-0 rating in the UL-94 test and owned a high limiting oxygen index(LOI)value of 37.0%,while DGEBA/DDM resins were consumed completely in the vertical combustion test with a low LOI of 23.0%.Furthermore,the microscale combustion calorimetry(MCC)results manifested that compared with DGEBA/DDM resins,both PHRR and THR values of the DGEA/DDM resins were dropped by 84.0%and 57.6%,***,the DGEA/DDM resin also presented higher storage modulus and tensile strength compared with DGEBA/DDM ***,in contrast with that of the cured DGEBA/DDM one(156℃),the DGEA/DDM thermoset displayed an extremely high glass transition temperature(232℃).This study breaks new ground on how to produce biobased monomers with aromatic structures and achieve high-performance thermosetting polymers.

关键词： Bio-based epoxy thermosets Apigenin Intrinsic anti-flammability

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Natural Killer Cell-Based Immunotherapy for Cancer: Advances and Prospects

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Engineering 2019年第1期5卷 106-114页

作者： yuan hu Zhigang Tian Cai Zhang Institute of Immunopharmacology and Immunotherapy School of Pharmaceutical Sciences Shandong University Jinan 250012 China Institute of Immunology School of Life Sciences University of Science and Technology of China Hefei 230061 China

Natural killer (NK) cells are key innate immune cells that provide the first line of defense against viral infection and cancer. Although NK cells can discriminate between "self" and "non-self," recognize abnormal cells, and eliminate transformed cells and malignancies in real time, tumors develop several strategies to escape from NK cell attack. These strategies include upregulating ligands for the inhibitory receptors of NK cells and producing soluble molecules or immunosuppressive factors. Various types of NK cells are currently being applied in clinical trials, including autologous or allogeneic NK cells, umbilical cord blood (UCB) or induced pluripotent stem cell (iPSC)-derived NK cells, memory-like NK cells, and NK cell line NK-92 cells, for the treatment of different types of tumors. Chimeric antigen receptors (CARs)-NK cells have recently shown great potential due to their redirect specificity and effective antitumor activity. In this review, we summarize the mechanisms of tumor escape from NK cell recognition, the current status and advanced progress of NK cell-based immunotherapy, ways of enhancing the antitumor capacity of NK cells in vivo, and major challenges for clinical practice in this field.

关键词： Natural killer cell Immunotherapy Cancer Clinical trial Chimeric antigen receptor

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On Levine–O'Sullivan's Sequence and Its Conjecture

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Acta Mathematica Sinica,English Series 2016年第8期32卷 961-966页

作者： Jia yuan hu Wen Peng ZHANG School of Mathematics Northwest University

Let ql = 1, and qn be the largest value of （k ＋ 1）（n - qk） for all integers 1 ≤ k≤ n - 1 with n ≥ 2. The sequence Q -- {q1, q2, q3,...} is called Levine-O＇Sullivan sequence. In this paper, we use the combinational and analysis skill and the mathematical induction to study the asymptotic properties of qn, and give an interesting asymptotic formula for it. This solved a conjecture proposed by Professor Chen Yonggao.

关键词： Levine-O'Sullivan sequence sum-free sequences estimate conjecture

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Phase transition of the frustrated antiferromagntic J1-J2-J3 spin-1/2 Heisenberg model on a simple cubic lattice

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Frontiers of physics 2019年第1期14卷 137-146页

作者： Ai-yuan hu huai-Yu Wang College of Physics and Electronic Engineering Chongqing Normal University Chongqing 401331 China Department of Physics Tsinghua University Beijing 100084 China

We have comprehensively investigated the frustrated J1-J2-J3 Heisenberg model on a simple cubic lattice. This model allows three regimes of magnetic order, viz., (π;π;π), (0;π;π) and (0;0;π), denoted as AF1, AF2, and AF3, respectively. The effects of the interplay of neighboring couplings on the model are studied in the entire temperature range. The zero temperature magnetic properties of this model are discussed utilizing the linear spin wave (LSW) theory, nonlinear spin wave (NLSW) theory, and Green’s function (GF) method. The zero temperature phase diagrams evaluated by the LSW and NLSW methods are illustrated, and are observed to exhibit different parameter boundaries. In certain regions and along the parameter boundaries, the possible phase transformations driven by the parameters are discussed. The results obtained using the LSW, NLSW, and GF methods are compared with those obtained using the series expansion (SE) method, and are observed to be in good agreement when the value of J2 is not close to the parameter boundaries. The ground state energies obtained using the LSW and NLSW methods are close to that obtained using the SE method. At finite temperatures, only the GF method is employed to evaluate the magnetic properties, and the calculated phase diagram is observed to be identical to the classical phase diagram. The results indicate that at the parameter boundaries, a temperature-driven first-order phase transition between AF1 and AF2 may occur along the boundary line. Along the AF1-AF3 and AF2-AF3 boundary lines, AF3 is less stable than AF1 and AF2. Our calculated critical temperature agrees with that obtained using Monte Carlo simulations and pseudofermion functional renormalization group scheme.

关键词： quantized spin models quantum phase transitions antiferromagnetics

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A systematic machine learning method for reservoir identification and production prediction

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Petroleum Science 2023年第1期20卷 295-308页

作者： Wei Liu Zhangxin Chen yuan hu Liuyang Xu Department of Chemical and Petroleum Engineering University of CalgaryABCanada Rockeast Energy Ltd. CalgaryABCanada Jilin Oilfield CNPCChangchunJilin130000China

Reservoir identification and production prediction are two of the most important tasks in petroleum exploration and *** learning(ML)methods are used for petroleum-related studies,but have not been applied to reservoir identification and production prediction based on reservoir *** forecasting studies are typically based on overall reservoir thickness and lack accuracy when reservoirs contain a water or dry layer without oil *** this paper,a systematic ML method was developed using classification models for reservoir identification,and regression models for production *** production models are based on the reservoir identification *** realize the reservoir identification,seven optimized ML methods were used:four typical single ML methods and three ensemble ML *** methods classify the reservoir into five types of layers:water,dry and three levels of oil(I oil layer,II oil layer,III oil layer).The validation and test results of these seven optimized ML methods suggest the three ensemble methods perform better than the four single ML methods in reservoir *** XGBoost produced the model with the highest accuracy;up to 99%.The effective thickness of I and II oil layers determined during the reservoir identification was fed into the models for predicting *** thickness considers the distribution of the water and the oil resulting in a more reasonable production prediction compared to predictions based on the overall reservoir *** validate the superiority of the ML methods,reference models using overall reservoir thickness were built for *** models based on effective thickness outperformed the reference models in every evaluation *** prediction accuracy of the ML models using effective thickness were 10%higher than that of reference *** the personal error or data distortion existing in traditional methods,this novel system realizes r

关键词： Reservoir identification Production prediction Machine learning Ensemble method

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Numerical simulation on directional solidification and heat treatment processes of turbine blades

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China Foundry 2024年第5期21卷 476-490页

作者： Ye-yuan hu Ju-huai Ma Qing-yan Xu School of Materials Science and Engineering Tsinghua UniversityKey Laboratory for Advanced Materials Processing TechnologyMinistry of EducationBeijing 100084China

Study on turbine blades is crucial due to their critical role in ensuring the efficient and reliable operation of aircraft ***-based single crystal superalloys are extensively used in the hot manufacturing of turbine blades due to their exceptional high-temperature mechanical *** hot manufacturing of single crystal blades involves directional solidification and heat *** manufacturing of these blades is time-consuming,capital-intensive,and often insufficient to meet industrial *** simulation techniques have gained widespread acceptance in blade manufacturing research due to their low energy consumption,high efficiency,and rapid turnaround *** article introduces the modeling and simulation of hot manufacturing in single crystal *** discussion outlines the prevalent mathematical models employed in numerical simulations related to blade hot *** encapsulates the advancements in research concerning macro to micro-level numerical simulation techniques for directional solidification and heat treatment ***,potential future trajectories for the numerical simulation of single crystal blade hot manufacturing are also discussed.

关键词： single crystal blades Ni-based superalloy directional solidification heat treatment numerical simulation

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Preparation and Characterization of Single-Phase Perovskite La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)

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Journal of Natural Gas Chemistry 2006年第1期15卷 58-62页

作者： Wenhui yuan Xiaofang hu Li Li College of Chemical Engineering and Energy South China University of Technology Guangdong Key Laboratory of Green Chemicals Guangzhou 510640 China

Single-phase perovskite La0.6Sr0.4Co0.8Fe0.2O3-δ has been successfully prepared by using citrate-EDTA complexation method at relatively low calcination temperature. The structure and thermal decomposition process of the complex precursor have been investigated by means of differential scanning calorimetry-thermal gravimetric analysis （DSC/TGA）, X-ray diffraction （XRD）, and Fourier transform infrared spectroscopic （FT-IR） measurements. The precursor decomposed completely and started to form perovskite-type oxide above 420 ℃ according to the differential scanning calorimetry （DSC） and thermal gravimetric analysis （TGA） results. Single-phase perovskite La0.6Sr0.4Co0.8Fe0.2O3-δ obtained has been confirmed from the XRD pattern, and no peak of SrCO3 was found by XRD of the oxides synthesized at a relatively low temperature of 800℃. The reducibility of La0.6Sr0.4Co0.8Fe0.2O3-δ was also characterized by the temperature programmed reduction （TPR） technique. Disk shaped dense La0.6Sr0.4Co0.8Fe0.2O3-δ membrane was prepared by the isostatical pressing method. The oxygen flux rate of dense La0.6Sr0.4Co0.8Fe0.2O3-δ membrane was （2.8-18）× 10^-8 mol/（cm^2.s） in the temperature range of 800-1000 ℃.

关键词： perovskite La0.6Sr0.4Co0.8Fe0.2O3-δ oxygen permeation preparation characterization

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