检索结果-南通市图书馆

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第6期31卷 659-667页

作者： Ke Zhang Ping Liu Wei Li Feng-Cang Ma yong-hua rong School of Materials Science and Engineering University of Shanghai for Science and Technology School of Materials Science and Engineering Shanghai Jiao Tong University

The orientation relationships（ORs）between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this *** ORs in the studied steels are identified by selected-area electron diffraction（SAED）as either K–S or N–W ***,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by *** simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index ***,the simulated results coincide well with experimental pole figures in the high-index directions{123}_（bcc）.A modified method with simplicity based on Miyamoto’s work was *** results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.

关键词： Martensite steels Martensite transformation Retained austenite Orientation relationship Electron backscattered diffraction

Machine learning for prediction of retained austenite fraction and optimization of processing in quenched and partitioned steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第8期31卷 2002-2013页

作者： Shuai Wang Jie Li Li-yang Zeng Xun-wei Zuo Nai-lu Chen yong-hua rong Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The metastable retained austenite(RA)plays a significant role in the excellent mechanical performance of quenching and partitioning(Q&P)steels,while the volume fraction of RA(V_(RA))is challengeable to directly predict due to the complicated relationships between the chemical composition and process(like quenching temperature(Qr)).A Gaussian process regression model in machine learning was developed to predict V_(RA),and the model accuracy was further improved by introducing a metallurgical parameter of martensite fraction(fo)to accurately predict V_(RA) in Q&P *** developed machine learning model combined with Bayesian global optimization can serve as another selection strategy for the quenching temperature,and this strategy is very effcient as it found the"optimum"Qr with the maximum V_(RA) using only seven consecutive *** benchmark experiment also reveals that the developed machine learning model predicts V_(RA) more accurately than the popular constrained carbon equilibrium thermodynamic model,even better than a thermo-kinetic quenching-partitioning-tempering-local equilibrium model.

关键词： Q&P steel Retained austenite fraction Machine learning Quenching temperature Gaussian process regression model

The analysis of γ-glutamyl transpeptidase gene in different type liver tissues

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2003年第2期9卷 276-280页

作者： Guo-Qing Han Cheng-yong Qin rong-hua Shu The Center of Liver Diseases, Shandong Provincial Hospital, Clinical Medical College of Shandong University, Jinan 250021, China Guo-Qing Han Cheng-Yong Qin Rong-Hua Shu The Center of Liver Diseases Shandong Provincial Hospital Clinical Medical College of Shandong University Jinan 250021 China

AIM: To probe the value of γ-glutamyl transpeptidase (GGT)messenger RNA in monitoring canceration of liver cells andfor early diagnosis of hepatocellular carcinoma (HCC), byresearching the types of GGT messenger RNA (GGTmRNA)in liver tissues and peripheral blood of different ***: The three types of GGTmRNA (A, B, C) in livertissues and peripheral blood from the patients with HCC,noncancerous hepatopathy, hepatic benign tumor, secondarycarcinoma of liver, and healthy persons were detected byreverse-transcription polymerase chain reaction (RT-PCR).RESULTS: (1) In normal liver tissues, type A waspredominantly found (100.00 %), type B was not found,type C was found occasionally (25.00 %). (2) The distributionof types of GGTmRNA in liver tissues with acute hepatitis,chronic hepatitis, cirrhosis, alcoholic hepatopathy was similaras in normal liver tissues (P＞0.05), but type B was found in3 of 18 patients with chronic hepatitis (16.67 %), and alsoin 3 of 11 patients with cirrhosis (27.27 %). (3) There wasno significant difference of types of GGTmRNA between livertissues with hepatic benign tumor, secondary carcinoma ofliver and normal liver tissues (P＞0.05). (4) Type B waspredominant in cancerous tissues with HCC (87.5 %), theprevalence of type B in cancerous tissues was significantlyhigher than that in normal liver tissues (0/12) (P＜0.05), butthe prevalence of type A in cancerous tissues (46.88 %)was significantly lower than that in normal liver tissues(100.00 %) (P＜0.05), and the prevalence of type C (6.25 %)in cancerous was the same as that in normal liver tissues(25.00 %) (P＞0.05). In noncancerous tissues of livers withHCC, the main types were type A and type B, the prevalenceof type A (85.71%, 90.48 %) and type C (14.29 %, 9.52 %)in noncancerous tissues of liver with HCC was similar asthat in normal liver tissues (A: 100.00 %; C: 25.00 %)(P＞0.05), but the prevalence of type B (80.95 %, 76.19 %)in noncancerous tissues of livers with HCC was significantl

关键词： γ-谷氨酰转肽酶肝组织 RT-PCR 慢性肝炎肝细胞癌

ImSpiRE: image feature-aided spatial resolution enhancement method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第1期 272-283页

作者： Yuwei hua Yizhi Zhang Zhenming Guo Shan Bian yong Zhang State Key Laboratory of Cardiovascular Diseases and Medical Innovation Center Institute for Regenerative MedicineDepartment of NeurosurgeryShanghai East HospitalShanghai Key Laboratory of Signaling and Disease ResearchFrontier Science Center for Stem Cell ResearchSchool of Life Sciences and TechnologyTongji University

The resolution of most spatially resolved transcriptomic technologies usually cannot attain the single-cell level, limiting their applications in biological discoveries. Here, we introduce ImSpiRE, an image feature-aided spatial resolution enhancement method for in situ capturing spatial transcriptome. Taking the information stored in histological images, ImSpiRE solves an optimal transport problem to redistribute the expression profiles of spots to construct new transcriptional profiles with enhanced resolution, together with extending the gene expression profiles into unmeasured regions. Applications to multiple datasets confirm that ImSpiRE can enhance spatial resolution to the subspot level while contributing to the discovery of tissue domains, signaling communication patterns, and spatiotemporal characterization.

关键词：

同方期刊数据库

Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng huang Mudong Tu hua Li yong Peng Wei Dou Cailing Xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering School of Materials and Energy Lanzhou University College of Chemistry and Chemical Engineering Luoyang Normal University

Designing highly active and stable electrocatalysts of oxygen evolution reaction （OER） is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium（Rh@NiFe-MIL-53）,is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe（OH）2after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center （εd）,accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity （240 mV） with a small Tafel slope of 48.2 mV dec-1and long-term durability (over1270 h at 10 m A cm-2and 110 h at 200 mA cm-2).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： X ray photoelectron spectroscopy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

古生界海相页岩储层井壁稳定影响因素分析

科学技术与工程 2016年第34期16卷 176-180页

作者：郑永华李少荣张健强陈朝刚国土资源部页岩气资源勘查重点实验室(重庆地质矿产研究院) 重庆市页岩气资源与勘查工程技术研究中心(重庆地质矿产研究院)油气资源与探测国家重点实验室重庆页岩气研究中心重庆400042

古生界海相页岩主要发育有水井沱组、鲁家坪组、牛蹄塘组以及五峰-龙马溪组等页岩储层。由于不同储层矿物成份、地质特征以及岩石力学特征不同,因而,会对井壁稳定产生不同的影响作用。通过对古生界海相页岩储层进行矿物成份、水化作用... 详细信息

古生界海相页岩主要发育有水井沱组、鲁家坪组、牛蹄塘组以及五峰-龙马溪组等页岩储层。由于不同储层矿物成份、地质特征以及岩石力学特征不同,因而,会对井壁稳定产生不同的影响作用。通过对古生界海相页岩储层进行矿物成份、水化作用、岩石力学实验以及数值模拟,分析影响古生界海相页岩储层井壁稳定的因素,结果表明：①古生界海相页岩储层均不含易水化膨胀的蒙脱石;②古生界海相页岩储层具有非水敏性特征,水化作用不是影响井壁稳定的主要因素;③水基钻井液会降低古生界海相页岩储层岩石强度,降低幅度在6.4%-37.33%之间;④大倾角、层理弱面对井壁稳定有显著影响,会导致钻井液安全密度窗口会大幅减小。

关键词：古生界海相页岩井壁稳定层理弱面数值模拟

Nonlinear stochastic optimal bounded control of hysteretic systems with actuator saturation

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 351-357页

作者： rong-hua huaN Wei-qiu ZHU yong-jun WU Department of Mechanics State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China College of Information Science and Engineering East China University of Science and Technology Shanghai 200237 China

A modified nonlinear stochastic optimal bounded control strategy for random excited hysteretic systems with actuator saturation is proposed. First, a controlled hysteretic system is converted into an equivalent nonlinear nonhysteretic stochastic system. Then, the partially averaged Itoe stochastic differential equation and dynamical programming equation are established, respectively, by using the stochastic averaging method for quasi non-integrable Hamiltonian systems and stochastic dynamical programming principle, from which the optimal control law consisting of optimal unbounded control and bang-bang control is derived. Finally, the response of optimally controlled system is predicted by solving the Fokker-Planck-Kolmogorov （FPK） equation associated with the fully averaged Itoe equation. Numerical results show that the proposed control strategy has high control effectiveness and efficiency.

关键词： Hysteretic system Stochastic averaging Optimal control Dynamical programming Actuator saturation

智能制造与专精特新双认证政策的协同效应——基于供应链企业创新视角

在线全文

学校读者我要写书评

暂无评论

山西财经大学学报 2025年第1期47卷 98-114页

作者：陈金勇樊荣汤湘希湖北大学商学院中南财经政法大学会计学院

通过构建双认证政策赋能企业创新的分析框架，使用固定效应泊松模型，探究智能制造与专精特新政策协同对企业创新的影响及作用机制。结果发现：相较于单认证企业，双认证政策对企业创新的协同激励效应更强，且在国有企业和高科技行业中... 详细信息

通过构建双认证政策赋能企业创新的分析框架，使用固定效应泊松模型，探究智能制造与专精特新政策协同对企业创新的影响及作用机制。结果发现：相较于单认证企业，双认证政策对企业创新的协同激励效应更强，且在国有企业和高科技行业中表现得更为显著；相较于非认证企业，单认证政策对企业创新的直接激励效应更强，呈现出明显的梯度效应；双认证政策通过增加政府补助和提高客户集中度，促进企业创新；智能制造政策的创新激励效应高于专精特新政策。

关键词：智能制造专精特新协同效应供应链创新挤出效应政府补贴客户集中度策略性创新

An Algorithmic Approach to the q-Summability Problem of Bivariate Rational Functions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2021年第1期34卷 107-121页

作者： WANG rong-hua School of Mathematical Sciences Tiangong UniversityTianjin 300387China

In 2014, Chen and Singer solved the summability problem of bivariate rational *** an algorithmic proof was presented by Hou and the author. In this paper, the algorithm will be simplified and adapted to the q-case.

关键词： Gosper's algorithm polynomial residues q-summability