检索结果-南通市图书馆

Mechanism and simulation of droplet coalescence in molten steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第11期24卷 1251-1259页

作者： bing ni Tao Zhang Hai-qi ni Zhi-guo Luo Department of Metallurgical Technology Central Iron and Steel Research Institute School of Metallurgy Northeastern University

Droplet coalescence in liquid steel was carefully investigated through observations of the distribution pattern of inclusions in solidified steel samples. The process of droplet coalescence was slow, and the critical Weber number(We) was used to evaluate the coalescence or separation of droplets. The relationship between the collision parameter and the critical We indicated whether slow coalescence or bouncing of droplets occurred. The critical We was 5.5, which means that the droplets gradually coalesce when We ≤ 5.5, whereas they bounce when We > 5.5. For the carbonate wire feeding into liquid steel, a mathematical model implementing a combined computational fluid dynamics(CFD)–discrete element method(DEM) approach was developed to simulate the movement and coalescence of variably sized droplets in a bottom-argon-blowing ladle. In the CFD model, the flow field was solved on the premise that the fluid was a continuous medium. Meanwhile, the droplets were dispersed in the DEM model, and the coalescence criterion of the particles was added to simulate the collision-coalescence process of the particles. The numerical simulation results and observations of inclusion coalescence in steel samples are consistent.

关键词： mechanism simulation droplet collision coalescence molten steel

在线全文

学校读者我要写书评

暂无评论

中国钢铁行业数字化碳管理发展探讨

工程科学学报 2024年第2期46卷 209-217页

作者：李涛郦秀萍上官方钦张巍周继程倪冰段志伟滕国翔中国钢研科技集团有限公司钢铁绿色化智能化技术中心北京100081 北京金自天正智能控制股份有限公司北京100070

为了缓解全球气候变暖,应对碳关税等国际贸易形式对中国钢铁行业带来的冲击和影响,助力钢铁行业早日实现“碳达峰+碳中和”的目标.基于中国钢铁行业碳排放现状与钢铁企业碳管理的痛点,本文通过深度融合数字化技术,创新提出了数字化技术... 详细信息

为了缓解全球气候变暖,应对碳关税等国际贸易形式对中国钢铁行业带来的冲击和影响,助力钢铁行业早日实现“碳达峰+碳中和”的目标.基于中国钢铁行业碳排放现状与钢铁企业碳管理的痛点,本文通过深度融合数字化技术,创新提出了数字化技术赋能钢铁行业应用架构,通过分析钢铁行业数字化碳管理的典型案例,讨论了不同阶段数字化碳管理体系建设的侧重点,并针对性地提出了相应的应对策略.本文提出的数字化碳管理的架构应该主要包括四个层次:基础设施层&数据采集层、数据运算层、业务应用层和用户层.数字化碳管理在钢铁行业的应用场景应该主要包括碳核算、碳账户、碳全景、碳结构&碳比对、碳交易、碳报告、碳咨询、能碳协同、低碳指数、供应链产品碳足迹管理,产品实时碳足迹跟踪、数字化碳标签、识别节能潜力和生态设计等.通过研究钢铁行业数字化碳管理的典型应用案例,探讨了数字化碳管理技术应用在钢铁行业的展望,按照钢铁行业是否纳入全国碳交易市场,将中国钢铁行业数字化碳管理体系的建设分为两个阶段,认为政府部门应该发挥在数字化碳管理体系建设过程中的主导作用,在健全数字化碳管理相关标准和法规体系的同时,应该注重数字化碳管理人才的培养,紧密对接企业现有的信息化系统,并提出了“六化一体+多平台”的钢铁行业数字化碳管理的发展趋势,即“一主体+多平台”的低碳产品评价认证体系,和具有标准化、国际化、一体化、安全化、资产化和本土化特点的数字化碳管理体系.将数字化碳管理技术应用到钢铁行业,能够更好地解决钢铁行业碳管理的乱象和企业碳管理的痛点,降低钢铁行业碳管理的门槛,提高钢铁行业碳管理的效率,保障碳数据在传递过程中的安全.

关键词：数字化技术碳管理碳达峰碳中和钢铁行业

数据科学视角下研究生计量经济学课程教学改革探究

在线全文

学校读者我要写书评

暂无评论

对外经贸 2024年第7期 133-136页

作者：张军倪冰于晓宇东北财经大学辽宁大连116025

在新一轮科技革命和产业变革的推动下,经济数据呈现出爆炸式增长,未来的经济学研究正进入数据科学时代,这一转变迫切要求对研究生计量经济学课程的教学内容和教学方法进行探讨。分析当前研究生计量经济学教学面临的问题与挑战,从丰富课... 详细信息

在新一轮科技革命和产业变革的推动下,经济数据呈现出爆炸式增长,未来的经济学研究正进入数据科学时代,这一转变迫切要求对研究生计量经济学课程的教学内容和教学方法进行探讨。分析当前研究生计量经济学教学面临的问题与挑战,从丰富课堂教学内容、充分利用网络教学资源、强化实践操作和案例教学、完善课程考核形式等角度,提出大数据背景下研究生计量经济学的教学改革措施。在数据科学时代下,以计量经济学为代表的经管类研究生课程教学需要积极融合来自社会各界的资源和技术,通过不断创新和追求卓越,有效地支撑国家的创新发展需求。

关键词：数据科学计量经济学课程教学模式教学改革

老年男性2型糖尿病患者血清睾酮与体重指数的相关性研究

在线全文

学校读者我要写书评

暂无评论

中国处方药 2024年第6期22卷 171-173页

作者：黄崇兵王思宏倪孝兵刘贤彬皖南医学院附属宣城医院内分泌科安徽宣城242000

目的研究老年男性2型糖尿病(T2DM)患者血清总睾酮(TT)与体重指数(BMI)的相关性。方法选取老年男性T2DM患者123例,测量其身高、体重并计算BMI,检测血清TT、糖脂代谢等指标。依据BMI将研究对象分为正常体重组(18.0≤BMI<24.0 kg/m^(2))、... 详细信息

目的研究老年男性2型糖尿病(T2DM)患者血清总睾酮(TT)与体重指数(BMI)的相关性。方法选取老年男性T2DM患者123例,测量其身高、体重并计算BMI,检测血清TT、糖脂代谢等指标。依据BMI将研究对象分为正常体重组(18.0≤BMI<24.0 kg/m^(2))、超重组(24.0≤BMI<28.0 kg/m^(2))和肥胖组(BMI≥28.0 kg/m^(2))。比较、分析各组临床指标。结果随着BMI上升,正常体重、超重、肥胖组TT依次下降(P<0.05)。Pearson相关分析结果表明,TT与BMI呈负相关(P<0.05)。多重线性回归分析显示:BMI、年龄、低密度脂蛋白胆固醇(LDL-C)、空腹血糖(FPG)、估算的肾小球滤过率(eGFR)是TT的影响因素。结论老年男性T2DM患者血清TT水平与BMI呈负相关,超重、肥胖是血清TT下降的影响因素。

关键词： 2型糖尿病睾酮体重指数

A perspective on the electrocatalytic conversion of carbon dioxide to methanol with metallomacrocyclic catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第1期31卷 263-275,I0008页

作者： Xinyan Liu Bo-Quan Li bing ni Lei Wang Hong-Jie Peng Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Physical Chemistry Department of ChemistryUniversity of KonstanzUniversitatsstrasse 10D-78457 KonstanzGermany Department of Chemical and Biomolecular Engineering National University of Singapore.Singapore 117585Singapore

Electrocatalytic carb on dioxide reducti on(CO_(2)R)presents a promising route to establish zero-e mission carb on cycle and store in termittent ren ewable energy into chemical fuels for steady energy *** is an ideal energy carrier as alternative fuels and one of the most important commodity ***,methanol is currently mainly produced from fossil-based syngas,the production of which yields tremendous carb on emission *** CO_(2)R towards metha nol poses great potential to shift the paradigm of methanol *** this perspective,we focus our discussions on producing methanol from electrochemical CO_(2)R,using metallomacrocyclic molecules as the model *** discuss the motivation of having methanol as the sole CO_(2)R product,the documented application of metallomacrocyclic catalysts for CO_(2)R,and recent advance in catalyzing CO_(2) to methanol with cobalt phthalocyanine-based *** attempt to understand the key factors in determining the activity,selectivity,and stability of electrocatalytic CO_(2)-to-methanol conversion,and to draw mechanistic insights from existing ***,we identify the challenges hindering methanol electrosynthesis directly from CO_(2) and some intriguing directions worthy of further investigation and exploration.

关键词： Carbon dioxide reduction Methanol Electrocatalysis Molecular catalysts Single atom catalysts Heterogenization

Spatio-temporal flow maps for visualizing movement and contact patterns

在线全文

学校读者我要写书评

暂无评论

Visual Informatics 2017年第1期1卷 57-64页

作者： bing ni Qiaomu Shen Jiayi Xu Huamin Qu Department of Computer Science and Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong Noah’s Ark Lab Huawei TechnologiesRoom 525-530Core Building 2HKSPShatinHong Kong

The advanced telecom technologies and massive volumes of intelligent mobile phone users have yielded a huge amount of real-time data of people’s all-in-one telecommunication records,which we call telco big *** telco data and the domain knowledge of an urban city,we are now able to analyze the movement and contact patterns of humans in an unprecedented *** map is widely used to display the movements of humans from one single source to multiple destinations by representing locations as nodes and movements as ***,it fails the task of visualizing both movement and contact *** addition,analysts often need to compare and examine the patterns side by side,and do various quantitative *** this work,we propose a novel spatio-temporal flow map layout to visualize when and where people from different locations move into the same places and make *** also propose integrating the spatiotemporal flow maps into existing spatiotemporal visualization techniques to form a suite of techniques for visualizing the movement and contact *** report a potential application the proposed techniques can be applied *** results show that our design and techniques properly unveil hidden information,while analysis can be achieved efficiently.

关键词： Spatio-temporal data Flow map Urban mobility

Synthesis of Flower-like Zinc Oxalate Microspheres in Ether-water Bilayer Refluxing Systems and Their Conversion to Zinc Oxide Microspheres

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

Journal of Materials Science & Technology 2011年第6期27卷 563-569页

作者： Liang ni Lei Wang bing Shao Yinjue Wang Wenli Zhang Yong Jiang School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang 212013 China

Flower-like zinc oxalate with a mean diameter of 50 μm was synthesized via the reaction of zinc acetate and dimethyl oxalate in ether-water bilayer refluxing systems at low ***-like zinc oxalate microspheres can be further transformed into the similar morphology to zinc oxide by the decomposition of zinc oxalate at 500℃.Scanning electron microscopy（SEM）,X-ray diffraction（XRD）,thermogravimetric analysisdifferential scanning calorimetric（TG-DSC）,energy dispersive X-ray spectrum（EDX） and Fourier transforminfrared spectroscopy（FT-IR） were used to characterize the structure features and chemical compositions of the as-synthesized *** UV-Vis and photoluminescence spectrum of flower-like zinc oxide microspheres were *** experimental results showed that flower-like zinc oxalate microspheres may be self-assembled by the zinc oxalate *** ether-water volume ratio of 4：1 and refluxing temperature of 40℃ were considered to favor the preparation of flower-like zinc oxalate microspheres.

关键词： Bilayer refluxing system Zinc oxalate Zinc oxide Flower-like microspheres

Chirality communications between inorganic and organic compounds

在线全文

学校读者我要写书评

暂无评论

SmartMat 2021年第1期2卷 17-32页

作者： bing ni Helmut Cölfen Physical Chemistry Department of ChemistryUniversity of KonstanzKonstanzGermany

1|INTRODUCTION Chirality spans over almost every size range,from mole-cules to biological systems and even to *** is one of the fascinating geometrical properties with a lot of amazing manifestations in the material *** chemi-cal researchers,we are more interested in chirality at the molecular scale and *** molecules are found important in life science,agrochemicals,pharma-ceutical industries,biosensing,display materials,and so forth.1–5 Chirality stems from a structure lacking sym-metry elements of inversion symmetry and mirror‐plane,which makes the structure not superimposable with its mirror *** these two kinds of symmetries,any structure is chiral,besides conventional chiral organics or spiral inorganic *** essence of chirality is the stereochemistry of molecules or nanostructures.

关键词： Chiral inorganic mirror

An experimental study on RH vacuum chamber with a weir

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

Journal of Iron and Steel Research International 2023年第10期30卷 1929-1938页

作者： Qing He Tong-lu Yao Liu Liu Xiang-chen Li bing ni Long-fei Li Metallurgical Technology Research Department Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

A new Ruhrstahl-Heraeus(RH)equipment with a weir added to the vacuum chamber was designed to help improve refining efficiency of low-carbon steel *** flow characteristics of the new RH equipment and a traditional RH equipment were evaluated and compared through water modeling experiments and an optimized calculation *** the water experiments,the mixing time,the residence time and the circulation flow rates were measured,and the flow simulating molten steel in the vacuum was *** results show that the decarburization efficiency in the new RH equipment is much *** mixing time is equal to or less than that of the latter when the gas flow rate is higher than 2.33 m^(3)/*** proportion of the piston flow increases by at least 40%,and the proportion of the well-mixed flow decreases from greater than 40%to less than 20%.The effective flow rate of the new RH equipment increases greatly in the piston flow zone and the total lag flow zone based on the residence time distribution *** conclusion,when a weir is added to a RH vacuum chamber,the effective circulation flow increases significantly,and the decarburization rate KC of molten steel at low-carbon stage is improved.

关键词： Ruhrstahl-Heraeus Weir Water modeling Residence time distribution Decarburization