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Effect of microstructure evolution on Luders strain and tensile properties in an intercritical annealing medium-Mn steel

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Journal of Iron and Steel Research International 2021年第6期28卷 762-772页

作者： Shuai Wang Wei-jian Chen Zheng-zhi zhao xiao-long zhao xiao-yang Luo Qiang Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology University of Science and Technology BeijingBeijing 100083China Carbon Steel and Thin Slab Factory of Hongxing Iron and Steel Co. Ltd.Jiuquan Iron and Steel GroupJiayuguan 735100GansuChina

The influence of microstructural characteristics on Lu¨ders strain and mechanical properties was explored by means of altering thermo-mechanical circumstances in an intercritical annealing(IA)medium-Mn Fe-11Mn-0.09C-0.25Si(wt.%)*** IA of cold-rolled samples with severe plastic deformation,exclusively equiaxed dual phases were obtained because of active recovery and *** equiaxed austenite(gamma E)with a larger size and inadequate chemical concentration was more readily transformed into martensite,and subsequent transformation-induced plasticity(TRIP)effect was triggered actively at relatively higher IA temperature,lessening localized *** addition,grown-in dislocations were prone to multiply and migrate around a broad mean free path for coarser equiaxed ferrite(alpha E)due to weakening dynamic recovery;therefore,it was the ensuing increased mobility of dislocations instead of reserving plentiful initial dislocation density that facilitated the propagation velocity of Luders bands and the accumulation of work *** contrast,the bimodal-grained microstructure with lath-like and equiaxed austenite(gamma L+gamma E)satisfactorily contributed to a smaller yield point elongation(YPE)without compromise of comprehensive mechanical properties on the grounds that austenitic gradient stability gave rise to discontinuous but sustainable TRIP effect and incremental work ***,Luders strain is closely related to the absence of work hardening in the region which yields *** follows that the decreased stability of retained austenite,favorable mobility of dislocations and the bimodal-grained structure all prominently make up for the insufficiency of work hardening,thereof resulting in a limited YPE.

关键词： Luders strain Medium-Mn steel Work hardening Dislocation Mechanical property

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Non-linear relationship between combustion kinetic parameters and coal quality

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 344-352页

作者： Jian-guo YANG xiao-long ZHANG Hong zhao Li SHEN State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

Combustion kinetic parameters(i.e.,activation energy and frequency factor) of coal have been proven to relate closely to coal properties;however,the quantitative relationship between them still requires further *** paper adopts a support vector regression machine(SVR) to generate the models of the non-linear relationship between combustion kinetic parameters and coal *** analyses on the thermo-gravimetry(TG) data of 80 coal samples were performed to prepare training data and testing data for the *** models developed were used in the estimation of the combustion kinetic parameters of ten testing *** predicted results showed that the root mean square errors(RMSEs) were 2.571 for the activation energy and 0.565 for the frequency factor in logarithmic form,*** curves defined by predicted kinetic parameters were fitted to the experimental data with a high degree of precision.

关键词： Kinetic parameter Coal property Thermo-gravimetry(TG) Support vector regression machine(SVR) Differential evolution

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Effect ofαphase on fatigue crack growth of Ti-6242 alloy

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Journal of Iron and Steel Research International 2017年第8期24卷 811-822页

作者： Hang-wei Zhou Hui-qun Liu Dan-qing Yi Yu xiao xiao-long zhao Jian Wang Qi Gao School of Materials Science and Engineering Central South UniversityChangsha 410088HunanChina Key Laboratory of Nonferrous Materials Ministry of EducationCentral South UniversityChangsha 410083HunanChina BAOTI Group Ltd. Baoji 721014ShanxiChina

Fatigue crack growth as a function ofαphase volume fraction in Ti-6Al-2Sn-4Zr-2Mo（Ti-6242）alloy was investigated using fatigue testing,optical microscopy,scanning electron microscopy,and transmission electron ***α＋βannealing treatments with different solid solution temperatures and cooling rates were conducted in order to tailor microstructure with differentαphase features in the Ti-6242 alloy,and fatigue crack growth mechanism was discussed after detailed microstructure *** results showed that fatigue crack growth rate of Ti-6242 alloy decreased with the decrease in volume fraction of the primaryαphase（αp）.Samples with a large-sizedαgrain microstructure treated at high solid solution temperature and slow cooling rate have lower fatigue crack growth *** appearance of secondaryαphase（αs）with the increase of solid solution temperature led to crack ***,a fatigue crack growth transition phenomenon was observed in the Paris regime of Ti-6242 alloy with 29.8% αp（typical bi-modal microstructure）and large-sizedαgrain microstructure,owing to the change of fatigue crack growth mechanism.

关键词： Ti-6242 alloy Microstructure tailoring Fatigue crack growth α phase Fatigue crack growth rate Crack propagation transition

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Ge/Si heterojunction L-shape tunnel field-effect transistors with hetero-gate-dielectric

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Chinese Physics B 2018年第7期27卷 572-579页

作者： CongLi Zhi-Rui Yan Yi-Qi Zhuang xiao-long zhao Jia-Min Guo Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory School of MicroelectronicsXidian UniversityXi＇an 710071China

A Ge/Si heterojunction L-shaped tunnel field-effect transistor combined with hetero-gate-dielectric （GHL-TFET） is proposed and investigated by TCAD simulation. Current-voltage characteristics, energy-band diagrams, and the distri- bution of the band-to-band tunneling （BTBT） generation rate of GHL-TFET are analyzed. In addition, the effect of the vertical channel width on the ON-current is studied and the thickness of the gate dielectric is optimized for better suppression of ambipolar current. Moreover, analog/RF figure-of-merits of GHL-TFET are also investigated in terms of the cut-off frequency and gain bandwidth production. Simulation results indicate that the ON-current of GHL-TFET is increased by about three orders of magnitude compared with that of the conventional L-shaped TFET. Besides, the introduction of the hetero-gate-dielectric not only suppresses the ambipolar current effectively but also improves the analog/RF performance drastically. It is demonstrated that the maximum cut-off frequency of GHL-TFET is about 160 GHz, which is 20 times higher than that of the conventional L-shaped TFET.

关键词： tunnel field-effect transistors Ge/Si heterojunction hetero-gate-dielectric ambipolar effect

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Numerical analysis of coupled sloshing and motion of a cylindrical FPSO in regular waves

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Journal of Hydrodynamics 2024年第3期36卷 457-465页

作者： Wei-wen zhao xiao-long Yang De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Offshore Oil Engineering Co.Ltd. Tianjin300461China

In this paper,the coupled sloshing and motion characteristics of a cylindrical floating production storage offloading(CFPSO)are numerically investigated by means of computational fluid dynamics(CFD)*** simulations are performed using an in-house CFD solver naoe-FOAM-SJTU which is developed based on *** active wave generating-absorbing boundary condition(GABC)is utilized for wave generation and *** stabilized k-omega SST turbulence model are used to avoid excessive eddy viscosity near the free *** with and without partially filled liquid tanks in regular waves with different wave periods are simulated and vertical planar motions such as surge,heave and pitch response amplitude operators(RAOs)are *** due to liquid sloshing and wave loads are extracted and *** free surface motions inside liquid tanks in one wave period presented to explain the motion characteristics.

关键词： Coupled analysis liquid sloshing wave motion cylindrical floating production storage offloading(CFPSO)

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Synthesis and biological evaluation of novel steroid-linked nitrogen mustards

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Chinese Chemical Letters 2009年第6期20卷 680-683页

作者： Hua Bing Zhang Ji Jun Xue xiao long zhao De Gang Liu Ying Li State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 PR China

Two novel steroid-linked nitrogen mustard conjugates la and lb were synthesized by using estrogenic acid 4 coupled with aniline mustard 8 and phenol mustard 13 in an esterification or amidation procedure. Preliminary cytotoxic screening on cancer cell lines in vitro showed that, the steroid-ester linked nitrogen mustard conjugate la exhibited obvious increasing of activities.

关键词： Steroid Nitrogen mustards Synthesis Biological activity

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Numerical investigation of the coupled aero-hydrodynamic performances of a semi-submersible floating offshore wind turbine with inclined columns

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Journal of Hydrodynamics 2024年第2期36卷 316-330页

作者： Ying-jie Xue xiao-long Yang Wei-wen zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Offshore Oil Engineering Co.Ltd. Tianjin300461China

Numerical investigations of floating platforms with different outer column inclined angles under two operating conditions of regular wave and irregular wave are presented in this paper.A coupled aero-hydrodynamic computational fluid dynamics in-house solver FOWT-UALM-SJTU is applied for the ***,the validation for wave and wind generation are conducted to determine mesh distribution *** on these,the hydrodynamic motion response,aerodynamic performance and wake flow are analyzed to explore the impact of inclined *** spectral analysis on the motion response under wave action,discuss the aerodynamic attack angle and inflow wind velocity along the blade spanwise direction in detail,reveal different trends in wake development and *** results show that for the regular wave condition with the increase of inclined angles,the equilibrium position of surge motion is constantly rising,while pitch is *** maximum root mean square(rms)value occurs at angle=30°,compared with the original OC4 FOWT,the rms in power and thrust increase 0.35%,0.71%.And there are two low regions of attack angle and high regions of axial inflow velocity,corresponding to aerodynamic *** spectral analysis indicates that the natural frequency of pitch motion will increase with inclined ***,from the middle to far region of wake flow,the velocity recovery of FOWT with inclined angle will become faster,which is beneficial for downstream turbines to enhance more wind energy.

关键词： Floating offshore wind turbine numerical simulation aero-hydrodynamic coupled analysis floating platform with inclinedcolumns wake flow recovery

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Device topological thermal management of β-Ga_(2)O_(3) Schottky barrier diodes

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Chinese Physics B 2021年第6期30卷 509-515页

作者： Yang-Tong Yu Xue-Qiang Xiang Xuan-Ze Zhou Kai Zhou Guang-Wei Xu xiao-long zhao Shi-Bing long School of Microelectronics University of Science and Technology of ChinaHefei 230026China

The ultra-wide bandgap semiconductor β gallium oxide(β-Ga_(2) O_(3)) gives promise to low conduction loss and high power for electronic devices. However, due to the natural poor thermal conductivity of β-Ga_(2) O_(3), their power devices suffer from serious self-heating effect. To overcome this problem, we emphasize on the effect of device structure on peak temperature in β-Ga_(2) O_(3) Schottky barrier diodes(SBDs) using TCAD simulation and experiment. The SBD topologies including crystal orientation of β-Ga_(2) O_(3), work function of Schottky metal, anode area, and thickness, were simulated in TCAD, showing that the thickness of β-Ga_(2) O_(3) plays a key role in reducing the peak temperature of diodes. Hence, we fabricated β-Ga_(2) O_(3) SBDs with three different thickness epitaxial layers and five different thickness substrates. The surface temperature of the diodes was measured using an infrared thermal imaging camera. The experimental results are consistent with the simulation results. Thus, our results provide a new thermal management strategy for high power β-Ga_(2) O_(3) diode.

关键词： β-Ga_(2)O_(3)Schottky barrier diode thermal management TCAD simulation infrared thermal imaging camera

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Automatic modeling algorithm of stochastic error for inertial sensors

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Control Theory and Technology 2024年第1期22卷 81-91页

作者： Luodi zhao long zhao School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China Digital Navigation Center Beihang UniversityBeijing100191China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing100191China

This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.

关键词： GMWM Stochastic process Inertial sensor Sensor calibration Error model Allan variance

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Current landscape of preoperative neoadjuvant therapies for initial resectable colorectal cancer liver metastasis

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World Journal of Gastroenterology 2024年第7期30卷 663-672页

作者： xiao-Fei Cheng Feng zhao Dong Chen Fan-long Liu Department of Colorectal Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina Department of Radiation Oncology The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

Colorectal cancer liver metastasis(CRLM)presents a clinical challenge,and optimizing treatment strategies is crucial for improving patient *** resection,a key element in achieving prolonged survival,is often linked to a heightened risk of *** the potential benefits of preoperative neoadjuvant chemotherapy in managing resectable liver metastases,this approach has gained attention for its role in tumor downsizing,assessing biological behavior,and reducing the risk of postoperative ***,the use of neoadjuvant chemotherapy in initially resectable CRLM sparks ongoing *** balance between tumor reduction and the risk of hepatic injury,coupled with concerns about delaying surgery,necessitates a nuanced *** article explores recent research insights and draws upon the practical experiences at our center to address critical issues regarding considerations for initially resectable *** the criteria for patient selection and the judicious choice of neoadjuvant regimens are pivotal areas of *** the right balance between maximizing treatment efficacy and minimizing adverse effects is *** dynamic landscape of precision medicine is also reflected in the evolving role of gene testing,such as RAS/BRAF and PIK3CA,in tailoring neoadjuvant ***,the review emphasizes the need for a multidisciplinary approach to navigate the comp-lexities of *** technical expertise and biological insights is crucial in refining neoadjuvant *** management of progression following neoadjuvant chemotherapy requires a tailored approach,acknowledging the diverse biological behaviors that may *** conclusion,this review aims to provide a comprehensive perspective on the considerations,challenges,and advancements in the use of neoadjuvant chemotherapy for initially resectable *** combining evidencebased insights with practical experiences,we aspire to contribute

关键词： Neoadjuvant therapy Colorectal cancer liver metastasis Multidisciplinary teams Chemotherapeutic regimens Resectability criteria

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