检索结果-南通市图书馆

New insights into the effects of silicon content on the oxidation process in silicon-containing steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第9期23卷 1048-1055页

作者： Qing Yuan Guang Xu Ming-xing Zhou bei he The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China

Simultaneous thermal analysis（STA） was used to investigate the effects of silicon content on the oxidation kinetics of silicon-containing steels under an atmosphere and heating procedures similar to those used in industrial reheating furnaces for the production of hot-rolled strips. Our results show that when the heating temperature was greater than the melting point of Fe2SiO4, the oxidation rates of steels with different silicon contents were the same; the total mass gain decreased with increasing silicon content, whereas it increased with increasing oxygen content. The oxidation rates for steels with different silicon contents were constant with respect to time under isothermal conditions. In addition, the starting oxidation temperature, the intense oxidation temperature, and the finishing oxidation temperature increased with increasing silicon content; the intense oxidation temperature had no correlation with the melting of Fe2SiO4. Moreover, the silicon distributed in two forms： as Fe2SiO4 at the interface between the innermost layer of oxide scale and the iron matrix, and as particles containing silicon in grains and grain boundaries in the iron matrix.

关键词： silicon steel oxidation kinetics iron oxides silicon dioxide silicon content

Advancing early diagnosis of inflammatory bowel disease: A call for enhanced efforts

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第48期30卷 5191-5193页

作者： Shu-bei he Bing Hu Department of Gastroenterology and hepatology/Medical Engineering Integration Laboratory of Digestive Endoscopy West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

The diagnosis of inflammatory bowel disease(IBD)is complicated by its nonspecific clinical presentation and the limited accuracy of existing biomarker tests,frequently resulting in significant delays from the time of symptom onset to the achievement of a definitive ***,improving the early identification of IBD remains a crucial focus for ***üthner et al innovatively utilized medical data from German IBD patients to investigate risk factors contri-buting to these diagnostic ***,certain methodological limitations in the study have impacted data extraction and interpretation,underscoring the need for more comprehensive analyses to validate these findings.

关键词： Diagnostic delay Early identification Inflammatory bowel disease Crohn’s disease Ulcerative colitis

The Effects of Dwarfing Genes (Rht-B1b, Rht-D1b, and Rht8) with Different Sensitivity to GA_3 on the Coleoptile Length and Plant height of Wheat

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

Agricultural Sciences in China 2009年第9期8卷 1028-1038页

作者： TANG Na JIANG Ying he bei-ru HU Yin-gang College of Agronomy Northwest A＆F University Yangling 712100 P.R. China Yangling Branch of China National Wheat Improvement Centre Yangling 712100 P.R.China Shaanxi Key Laboratory of Molecular Biology for Agriculture Yangling 712100 P.R. China

Understanding the effects of wheat dwarfing genes on the coleoptile length and plant height is crucial for the proper utilization of dwarfing genes in the improvement of wheat yield. Molecular marker analysis combined with pedigree information were used to classify wheat cultivars widely planted in major wheat growing regions in China into different categories based on the dwarfing genes they carried. The effects of the dwarfing genes with different sensitivity to gibberellins （GA3） on the coleoptile length and plant height were analyzed. Screening of 129 cultivars by molecular marker analysis revealed that 58 genotypes of wheat contained the dwarfing gene Rht-B1b, 24 genotypes of wheat contained Rht-D1b gene and 73 genotypes of wheat possessed Rht8 gene. In addition, among these 129 cultivars, 35 genotypes of wheat cultivars contained both Rht-B1b and Rht8 genes and 16 genotypes of wheat cultivars contained both Rht-D1b and Rht8 genes. Wheat cultivars with the dwarfing genes Rht-B1b or Rht-D1b were insensitive to GA3, while the cultivars with the dwarfing gene Rht8 were sensitive to GA3. Most of the wheat genotypes containing combination of Rht8 gene with either Rht-B1b or Rht-D1b gene were insensitive to GA3. The plant height was reduced by 24.6, 30.4, 28.2, and 32.2%, respectively, for the wheat cultivars containing Rht-B1b, Rht-D1b, Rht-B1b ＋ Rht8, and Rht-D1b ＋ Rht8 genes. The plant height was reduced by 14.3% for the wheat cultivar containing GA3-sensitive gene Rht8. The coleoptile length was shortened by 25.4, 31.3, 28.4 and 31.3%, respectively, in the wheat cultivars containing Rht-B1b, Rht-D1b, Rht-B1b ＋Rht8 and Rht-D1b ＋ Rht8 genes, while the coleoptile length was shortened only by 6.2% for the wheat cultivar containing Rht8 gene. We conclude that GA3-insensitive dwarfing genes （Rht-B1b and Rht-D1b） are not suitable for the wheat improvement in dryland because these two genes have effect on reducing both plant height and coleoptile length. In contrast, GA3

关键词： bread wheat dwarfing genes Rht-B1b Rht-D1b Rht8 coleoptile length plant height

Effects of oxygen content on the oxidation process of Si-containing steel during anisothermal heating

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 164-172页

作者： Qing Yuan Guang Xu Wei-cheng Liang bei he Ming-xing Zhou The State Key Laboratory of Refi'actories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China

The oxidizing behavior of Si-containing steel was investigated in an O2 and N2 binary-component gas with oxygen contents ranging between 0.5 vol% and 4.0 vol% under anisothermal-oxidation conditions. A simultaneous thermal analyzer was employed to simulate the heating process of Si-containing steel in industrial reheating furnaces. The oxidation gas mixtures were introduced from the commencement of heating. The results show that the oxidizing rate remains constant in the isothermal holding process at high temperatures; therefore, the mass change versus time presents a linear law. A linear relation also exists between the oxidizing rate and the oxygen content. Using the linear regression equation, the oxidation rate at different oxygen contents can be predicted. In addition, the relationship between the total mass gain and the oxygen content is linear; thus, the total mass gain at oxygen contents between 0.5 vol%–4.0 vol% can be determined. These results enrich the theoretical studies of the oxidation process in Si-containing steels.

关键词： oxidation oxygen content oxidation rate Si-containing steel fayalite anisothermal heating

Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 319-328页

作者： Xiao-qing Ni De-cheng Kong Ying Wen Liang Zhang Wen-heng Wu bei-bei he Lin Lu De-xiang Zhu Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of Materials Corrosion and Protection Center Key Laboratory for Corrosion and Protection (MOE) University of Science and Technology Beijing

The corrosion behavior and mechanical properties of 316 L stainless steel(SS) fabricated via selective laser melting(SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316 L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316 L SS in the XOZ plane were smaller than those of the SLMed 316 L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316 L was expected to exhibit higher strength but lower ductility than the wrought 316 L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316 L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or(Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316 L in FeCl3 solution was more serious after long-term service, indicating poor durability.

关键词： selective laser melting mechanical property corrosion resistance 316L stainless steel anisotropy molten pool boundary

Identifying Conformation States of Polymer through Unsupervised Machine Learning

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第12期38卷 1403-1408页

作者： Li-Wang Sun Hong Li Xiao-Qin Zhang he-bei Gao Meng Bo Luo College ofComputer Science and Atial Ielligence Wenzhou UniversityWenzhou 325035China Department of Information Wenzhou PolytechnicWenzhou 325035China Department of Physics Zhejiang UniversityHangzhou 310027China

The study of the critical behavior is important for classifying different configuration ***,machine learning is capable of discriminating polymer states in the presence of human ***,we introduce an unsupervised approach based on the self-organizing map(SOM)and the autoencoder network to locate critical phase transitions from raw configuration without the necessity for manual feature ***-dimensional configuration data can be encoded to low-dimensional codes by employing neural network of multilayer restrictive Boltzmann machines and the intermediate code can also be reconstructed to high-dimensional input *** then the codes are used to cluster different configuration states for polymers adsorbed on the homogeneous and the stripe-patterned surface by the SOM network and K-Means *** work presents an unusual tool to identify polymer configuration.

关键词： Phase transition Machine learning Clustering Polymer Configuration

A Fast LDL-factorization Approach for Large Sparse Positive Definite System and Its Application to One-to-one Marketing Optimization Computation

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2007年第1期4卷 88-94页

作者： Min Wu bei he Jin-Hua She School of Information Science and Engineering Central South University Changsha 410083 PRC School of Bionics Tokyo University of Technology Tokyo 192-0982Japan

LDL-factorization is an efficient way of solving Ax = b for a large symmetric positive definite sparse matrix A. This paper presents a new method that further improves the efficiency of LDL-factorization. It is based on the theory of elimination trees for the factorization factor. It breaks the computations involved in LDL-factorization down into two stages： 1） the pattern of nonzero entries of the factor is predicted, and 2） the numerical values of the nonzero entries of the factor are computed. The factor is stored using the form of an elimination tree so as to reduce memory usage and avoid unnecessary numerical operations. The calculation results for some typical numerical examples demonstrate that this method provides a significantly higher calculation efficiency for the one-to-one marketing optimization algorithm.

关键词： Sparse matrix factorization elimination tree structure prediction one-to-one marketing optimization.

Computer Simulation Study on Adsorption and Conformation of Polymer Chains Driven by External Force

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第2期39卷 258-266,I0009页

作者： he-bei Gao Hong Li Xiao-Qin Zhang Xiang-Hong Wang Chao-Yang Li Meng-Bo Luo Department of Information Wenzhou PolytechnicWenzhou 325035China College of Computer Science and Artificial Intelligence Wenzhou UniversityWenzhou 325035China Department of Physics Hangzhou Normal UniversityHangzhou 310036China Department of Physics Zhejiang UniversityHangzhou 310027China

In this work,Monte Carlo simulations are used to study the critical adsorption behaviors of flexible polymer chains under the action of an external driving force F parallel to an attractive flat *** critical adsorption temperature Tc decreases linearly with increasing F,indicating that the driving force suppresses the adsorption of *** conformation of polymer is also affected by the driving ***,the effect of F is dependent on the competition between the driving force and *** strong force or at low temperature,the polymer is stretched along the direction of the force,while under weak force or at high temperature,the polymer is not *** the force is comparable to the temperature,the polymer may be stretched perpendicular to the driving force,and below Tc,we observe conformational transitions from parallel to perpendicular and again to parallel by decreasing the *** found that the perpendicular stretched conformation leads the polymer chain to synchronously move along the direction of the driving ***,the conformational transitions are attributed to the competition and cooperation between the driving force and the temperature.

关键词： Critical adsorption Polymer Driving force Conformation Monte Carlo simulation

CCR1 and CCR5 expression on inflammatory cells is related to cigarette smoking and chronic obstructive pulmonary disease severity

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第23期125卷 4277-4282页

作者： WANG Fei he bei Department of Respiratory Diseases Peking University lhlrd HospitalBeijing 100191China

Background Chronic obstructive pulmonary disease （COPD） is a progressive disease associated with a cellular inflammatory response mostly concerned with cigarette smoking. Chemokine receptors CCRI/5 play an important role in the inflammatory cells recruitment in the lung of COPD patients. The aim of this study was to determine the impact of cigarette smoking on the expression of CCRI/5 on inflammatory cells in induced sputum, and the relationship between the receptors expression and COPD severity. Methods Differential cells in induced sputum were counted and the optical densities of CCR1 and CCR5 on inflammatory cells in induced sputum from COPD patients （n=29）, healthy smokers （n=11）, and nonsmokers （n=6） were measured using immunocytochemistry. Concentrations of CCL3, the ligand of CCRI/5, in supernatant of induced sputum were detected by enzyme-linked immunosorbent assay. Results The expressions of CCR1 and CCR5 on inflammatory cells in healthy smokers were significantly higher than those in nonsmokers, and the expression of CCR1 in patients with COPD was significantly increased when compared with nonsmokers but not healthy smokers. The expressions of CCR1 and CCR5 on inflammatory cells in severe and very severe COPD patients were higher compared with mild and moderate COPD patients. CCL3 level was positively correlated with the total cell counts in induced sputum and smoking history, and negatively correlated with percentage of predicted FEV1. Conclusions Cigarette smoking could increase the expression of CCR1 on the inflammatory cells. Both CCR1 and CCR5 expressions on the inflammatory cells in induced sputum could be associated with COPD severity.

关键词： pulmonary disease, chronic obstructive smoke inflammation receptors, CCR1 receptors, CCR5