检索结果-南通市图书馆

Oxidation and Induration Characteristics of Pellets Made from Western Australian Ultrafine Magnetite Concentrates and Its Utilization Strategy

引用

Journal of Iron and Steel Research(International) 2016年第9期23卷 924-932页

作者： cong-cong yang De-qing ZHU Jian PAN Bin-zhi ZHOU Hu XUN Department of Ferrous Metallurgy Central South University

Western Australian magnetite concentrates normally have ultrafine granularity and much higher specific surface areas than Chinese magnetite concentrates owing to the significant pre-grinding and beneficiation for saleable iron grade. Such characteristics will inevitably affect the subsequent pelletization process. However, very few investi- gations have been done before. Thus, the oxidation and induration characteristics of pellet made from a Western Aus- tralian ultrafine magnetite concentrate were revealed by conducting routine preheating-roasting tests in an electric tube furnace and investigating the microstructure of fired pellets under an optical microscope in comparison with that of pellets made from typical Chinese magnetite concentrate. The liquidus regions of CaO-SiO2-Fe2O3 and CaO-SiO2- Al2O3 ternary systems in air at various temperatures were calculated by FactSage software to explain the importance of liquid phase in the consolidation of fired pellets. The results show that pellet made from ultrafine magnetite con- centrate possesses better oxidability and preheating performance than that made from Chinese magnetite concentrate. However, it has inferior roasting performance, usually requiring conditions of roasting at 1280℃ for at least 30 rain to acquire sufficiently high compressive strength, which are attributed to higher temperature sensitivity caused by its smaller particle size and less formation of liquid phase because of low impurities like CaO and Al2O3 in raw materials. Correspondingly, its roasting performanee can be significantly improved by blending with Chinese magnetite concen- trates or increasing the pellet basicity （WCaO/WSiO2）. By comprehensive evaluation, blending with Chinese iron ore concentrates is an appropriate way to utilize Western Australia ultrafine magnetite concentrates.

关键词： oxidation induration characteristic ultrafine magnetite concentrate iron ore pellet metallurgical performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

优质食味水稻新品种泰香粳1402的特征特性与栽培技术

引用

北方水稻 2024年第1期54卷 52-54页

作者：常书琴孙建荣王启琛吴从阳衣政伟泰州市海陵区人民政府红旗街道办事处江苏泰州225300 江苏红旗种业股份有限公司江苏泰州225300 江苏省农业科学院泰州农科所江苏泰州225300

水稻新品种泰香粳1402为迟熟中粳稻早熟品种,母本为武运粳21号,父本为镇稻88/关东194。该品种分蘖力较强、株型紧凑、抗倒性强、食味品质优良,2021年通过江苏省农作物品种审定委员会审定,适宜在江苏省苏中及宁镇扬丘陵地区种植。介绍了... 详细信息

水稻新品种泰香粳1402为迟熟中粳稻早熟品种,母本为武运粳21号,父本为镇稻88/关东194。该品种分蘖力较强、株型紧凑、抗倒性强、食味品质优良,2021年通过江苏省农作物品种审定委员会审定,适宜在江苏省苏中及宁镇扬丘陵地区种植。介绍了该品种的选育情况及特征特性,从播种、育秧、移栽、水浆管理、肥料运筹、病虫草害防治等方面总结了其高产栽培技术要点。

关键词：水稻新品种泰香粳1402 特征特性栽培技术

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Crossroads:Pathogenic role and therapeutic targets of neutrophil extracellular traps in rheumatoid arthritis

引用

BIOCELL 2024年第1期48卷 9-19页

作者： yang LI JIAN LIU YUEDI HU CHENGZHI cong YIMING CHEN QIAO ZHOU Department of Rheumatology The First Affiliated Hospital of Anhui University of Chinese MedicineHefei230031China First Clinical Medical School Anhui University of Chinese MedicineHefei230031China Institute of Rheumatology Anhui Academy of Chinese MedicineHefei230031China

Rheumatoid arthritis(RA)is a prevalent autoimmune disease whose main features include chronic synovial inflammation,bone destruction,and joint degeneration.Neutrophils are often considered to be the first responders to inflammation and are a key presence in the inflammatory milieu of RA.Neutrophil extracellular traps(NETs),a meshwork of DNA-histone complexes and proteins released by activated neutrophils,are widely involved in the pathophysiology of autoimmune diseases,especially RA,in addition to playing a key role in the neutrophil innate immune response.NETs have been found to be an important source of citrullinated autoantigen antibodies and inflammatory factor release,which can activate RA synovial fibroblasts(FLS)and cause joint damage.This article reviews the role of NETs in the pathophysiology of RA,demonstrating the application of multiple molecules with various therapies,with a view to informing the discovery and development of novel biomarkers and therapeutic targets for RA.

关键词： Rheumatoid arthritis Neutrophil extracellular traps Review

来源：

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

A novel process for Fe recovery and Zn, Pb removal from a low-grade pyrite cinder with high Zn and Pb contents

引用

International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 981-989页

作者： cong-cong yang De-qing Zhu Jian Pan Si-wei Li Hong-yu Tian School of Minerals Processing and Bioengineering Central South University

Comprehensive utilization of pyrite cinders is increasingly important because of their huge annual outputs and potential valuable metals recovery to cope with the gradual depletion of high-grade mineral resources. In this work, a new process, i.e., a high-temperature chlorination–magnetizing roasting–magnetic separation process, was proposed for recovering Fe and removing Zn, Pb from a low-grade pyrite cinder containing 49.90 wt% Fe, 1.23 wt% Zn, and 0.29 wt% Pb. Various parameters, including the chlorinating conditions(dosage of Ca Cl2, temperature, and time) and the magnetization roasting conditions(amount of coal, temperature, and time) were investigated. The results indicate that the proposed process is effective for Fe recovery and Zn, Pb removal from the pyrite cinder. Through this process, 97.06% Zn, 96.82% Pb, and approximately 90% S can be removed, and 89.74% Fe is recovered as magnetite into the final product under optimal conditions. A purified magnetite concentrate containing 63.07 wt% Fe, 0.16 wt% P, 0.26 wt% S, and trace amounts of nonferrous metals(0.005 wt% Cu, 0.013 wt% Pb, and 0.051 wt% Zn) was obtained. The concentrate can be potentially used as a high-quality feed material for producing oxidized pellets by blending with other high-grade iron ore concentrates.

关键词： pyrite cinder purification zinc lead high-temperature chlorination magnetizing roasting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pyrometallurgical recycling of stainless steel pickling sludge: a review

引用

Journal of Iron and Steel Research(International) 2019年第6期26卷 547-557页

作者： cong-cong yang Jian Pan De-qing Zhu Zheng-qi Guo Xiao-ming Li School of Minerals Processing and Bioengineering Central South University Changsha 410083 Hunan China School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055 Shaanxi China

Stainless steel pickling sludge (SSPS), generated from the lime neutralization process of spent pickling liquor, is classified as a hazardous waste consisting of abundant metals like Fe, Cr and Ni, and other elements like F, S and Na, etc. Rather than a common disposal in landfill, recovering these metals and other valuable components from SSPS can not only create economic benefits, but also eliminate its adverse impacts on human health and the environment. A review of the formation mechanism and basic properties of SSPS was made, and the technical features, advantages and limitations of a series of pyrometallurgical treatment processes were summarized. Based on these, the main challenges for recycling of SSPS through the existing techniques are demonstrated. The traditional pelletizing/sintering-blast furnace process can only be used as a partial solution. Direct use of SSPS as flux in an argon-oxygen decarburization converter or electric arc furnace is a promising way, but low S sludges are preferred. The STAR process shows excellent recovery for metals, but it also has a low tolerance to the S and F contents in SSPS. And theINMETCO process is highly flexible in treatment of various wastes, whereas it exhibits relatively low Cr recovery and produces poor-quality pig iron. In addition, the feasibility of the rotary kiln-electric furnace, solid -state reduction of chromite and reduction-magnetic separation processes requires further studies. An urgent task at present is to develop a system for scientific classification and separate collection of SSPS in terms of chemical composition, notably S and F contents.

关键词： Stainless steel pickling sludge Hazardous waste Recycling Pyrometallurgical process Reduction Recovery

来源：

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

Intelligent overheating fault diagnosis for overhead transmission line using semantic segmentation

引用

High Voltage 2024年第2期9卷 309-318页

作者： Xiangyu yang Youping Tu Zhikang Yuan Zhong Zheng Geng Chen cong Wang Yan Xu Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijingChina College of Electronic and Information Engineering Tongji UniversityShanghaiChina

The strain clamps and leading wires are important components that connect conductors on overhead transmission lines and conduct current.During operation,poor contact between these components can cause abnormal overheating,leading to electric failures and threatening power system reliability.Recently,the use of unmanned aerial vehicles equipped with infrared thermal imagers for strain clamp and leading wire maintenance has become increasingly popular.Deep learning-based image recognition shows promising prospects for intelligent fault diagnosis of overheating faults.A pre-treatment method is proposed based on dynamic histogram equalisation to enhance the contrast of infrared images.The DeepLab v3+network,loss function,and existing networks with different backbones are compared.The DeepLab v3+network with ResNet101 and convolutional block attention module added,and the Focal Loss function achieved the highest performance with an average pixel accuracy of 0.614,an average intersection over union(AIoU)of 0.567,an F1 score of 0.644,and a frequency weighted intersection over union of 0.594 on the test set.The optimised Atrous rates has increased the AIoU by 12.91%.Moreover,an intelligent diagnosis scheme for evaluating the defect state of the strain clamps and leading wires is proposed and which achieves a diagnostic accuracy of 91.0%.

关键词： union fault diagnosis

来源：

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

Reliability of a Multicomponent Stress-strength Model Based on a Bivariate Kumaraswamy Distribution with Censored Data

引用

Acta Mathematicae Applicatae Sinica 2024年第2期40卷 478-507页

作者： cong-hua CHENG School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China

In this paper,we consider a system which has k statistically independent and identically distributed strength components and each component is constructed by a pair of statistically dependent elements with doubly type-II censored scheme.These elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate Kumaraswamy distribution and each element is exposed to a common random stress T which follows a Kumaraswamy distribution.The system is regarded as operating only if at least s out of k(1≤s≤k)strength variables exceed the random stress.The multicomponent reliability of the system is given by Rs,k=P(at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,k.The Bayes estimates of Rs,k have been developed by using the Markov Chain Monte Carlo methods due to the lack of explicit forms.The uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shape parameter is known.The asymptotic confidence interval and the highest probability density credible interval are constructed for Rs,k.The reliability estimators are compared by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate Kumaraswamy distribution multicomponent reliability doubly Type-II censored scheme interval estimation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高温三通球阀的冷却系统设计和分析

引用

阀门 2024年第6期 736-740页

作者：李永喜张鑫杨聪肖东海张建斌项光武浙江石化阀门有限公司浙江温州325025 温州理工学院浙江温州325025 合肥通用机械研究院有限公司安徽合肥230031

高温阀门一般要选择耐高温材料,不仅价格昂贵,而且使用寿命较短。一种高温三通硬密封球阀,不仅对三通流道和阀体中腔设计了冷却结构,而且对球体和阀杆也设计了冷却结构,降低了阀体及内件工作温度,既节约了材料成本,又延长密封面使用寿命... 详细信息

高温阀门一般要选择耐高温材料,不仅价格昂贵,而且使用寿命较短。一种高温三通硬密封球阀,不仅对三通流道和阀体中腔设计了冷却结构,而且对球体和阀杆也设计了冷却结构,降低了阀体及内件工作温度,既节约了材料成本,又延长密封面使用寿命,对维护设备和环境安全起保障作用。通过对冷却水和流道钢材的吸热计算,又通过对阀门内部温度场的有限元模拟分析,提高了阀门设计的先进可靠性,为用户提供高质量满意产品。

关键词：冷却流道套管导管架包箍

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Medicine Combined with Adjuvant Chemotherapy for Improving Myelosuppression in Colorectal Cancer Patients: A Systematic Review and Network Meta-Analysis

引用

Chinese Journal of Integrative Medicine 2024年第7期30卷 643-652页

作者： LI Rui ZHANG Tong YAN Shao-hua YAN Yun-zi DING Ya-cong WANG Yan-song yang Yu-fei Department of Oncology China Academy of Chinese Medical Sciences Xiyuan Hospital Department of Oncology Dongfang Hospital Beijing University of Chinese Medicine Graduate School Beijing University of Chinese Medicine

Objective: To assess the effectiveness of Chinese herbal medicine(CHM) combined with adjuvant chemotherapy on myelosuppression for colorectal cancer(CRC) patients using network meta-analysis(NMA). Methods: Literature searches in both international(PubMed, Embase, Web of Science, and Cochrane Library) and Chinese(China Science and Technology Journal Database, Wanfang Data, China National Knowledge Infrastructure) databases for relevant randomized controlled trials(RCTs) were conducted from inception until October 10, 2022. We included RCTs of patients who received CHM combined with chemotherapy, including FOLFOX, XELOX, FOLFIRI, and other relevant regimens in the CHM treatment group. The outcomes included the incidence of myelosuppression, leukopenia, hemoglobin reduction, and thrombocytopenia. Two reviewers independently screened the databases, extracted the data, and assessed the risk of bias and credibility of evidence. RevMan 5.4.1 software and STATA 14.0 were used to perform the NMA. Results: A total of 31 RCTs were included, published from 2008 to 2021 in Chinese. Among these, 2,314 participants comparing the following 9 CHMs were identified: Shengbai Recipe(SBR), Bazhen Decoction(BZD), Jianpi Jiedu Recipe(JJR), Jianpi Recipe(JR), Compound Cantharis Capsule(CCC), Zaofan Pill(ZFP), Guilu Erxian Gel(GL), Buzhong Tiaogan Decoction(BZ), and Qiamagu Capsule(QM). The results of NMA found an indirect comparison. Based on the surface under the cumulative ranking curve(SUCRA), the ZFP+ chemotherapy group had the lowest incidence of myelosuppression, with an odds ratio(OR) of 0.08 [95% confidence interval(CI): 0.01, 0.76], whereas the GL+ chemotherapy group had the lowest incidence of leukopenia, hemoglobin reduction, and thrombocytopenia, with an OR of 5.25(95% CI: 2.41, 11.43), 4.66(95% CI: 2.23, 9.72), and 0.27(95% CI: 0.13, 0.54), respectively. Moreover, BZD + chemotherapy could alleviate leukopenia, hemoglobin reduction, and thrombocytopenia(P<0.01). Pairwise comparison showed that there was no difference in the

关键词： Chinese herbal medicine colorectal cancer network meta-analysis systematic review myelosuppression chemotherapy

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Expression and significance of pigment epithelium-derived factor and vascular endothelial growth factor in colorectal adenoma and cancer

引用

World Journal of Gastrointestinal Oncology 2024年第3期16卷 670-686页

作者： Ye yang Wu Wen Feng-Lin Chen Ying-Jie Zhang Xiao-cong Liu Xiao-Yan yang Shan-Shan Hu Ye Jiang Jing Yuan Digestive Diseases Chengdu Qingbaijiang District People's HospitalChengdu 610300Sichuan ProvinceChina Digestive Diseases Chengdu Second People’s HospitalChengdu 610000Sichuan ProvinceChina Graduate School Chengdu Medical CollegeChengdu 610000Sichuan ProvinceChina

BACKGROUND The incidence and mortality of colorectal cancer(CRC)are among the highest in the world,and its occurrence and development are closely related to tumor neovascularization.When the balance between pigment epithelium-derived factors(PEDF)that inhibit angiogenesis and vascular endothelial growth factors(VEGF)that stimulate angiogenesis is broken,angiogenesis is out of control,resulting in tumor development.Therefore,it is very necessary to find more therapeutic targets for CRC for early intervention and later treatment.AIM To investigate the expression and significance of PEDF,VEGF,and CD31-stained microvessel density values(CD31-MVD)in normal colorectal mucosa,adenoma,and CRC.METHODS In this case-control study,we collected archived wax blocks of specimens from the Digestive Endoscopy Center and the General Surgery Department of Chengdu Second People's Hospital from April 2022 to October 2022.Fifty cases of specimen wax blocks were selected as normal intestinal mucosa confirmed by electronic colonoscopy and concurrent biopsy(normal control group),50 cases of specimen wax blocks were selected as colorectal adenoma confirmed by electronic colonoscopy and pathological biopsy(adenoma group),and 50 cases of specimen wax blocks were selected as CRC confirmed by postoperative pathological biopsy after inpatient operation of general surgery(CRC group).An immunohistochemical staining experiment was carried out to detect PEDF and VEGF expression in three groups of specimens,analyze their differences,study the relationship between the two and clinicopathological factors in CRC group,record CD31-MVD in the three groups,and analyze the correlation of PEDF,VEGF,and CD31-MVD in the colorectal adenoma group and the CRC group.The F test or adjusted F test is used to analyze measurement data statistically.Kruskal-Wallis rank sum test was used between groups for ranked data.The chi-square test,adjusted chi-square test,or Fisher's exact test were used to compare the rates between groups.All differences between groups were co

关键词： Pigment epithelium-derived factors Vascular endothelial growth factor Microvessel density Colorectal adenoma Colorectal cancer Targeted therapy

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：