检索结果-南通市图书馆

Development of an in-situ H_(2)reduction and moderate oxidation method for 3,5-dimethylpyridine hydrogenation in trickle bed reactor

引用

frontiers of chemical Science and Engineering 2022年第12期16卷 1807-1817页

作者： Tao Lin Xiaoxun ma School of chemical Engineering Northwest UniversityXi’an 710069China Kaili catalyst&New materials co. Ltd.Xi’an 710201China Shaanxi Key Laboratory of catalytic materials and Technology Xi’an 710201China chemical Engineering Research center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi’an 710069China Shaanxi Research center of Engineering Technology for clean coal conversion Xi’an 710069China collaborative Innovation center for Development of Energy and chemical Industry in Northern Shaanxi Xi’an 710069China International Scientific and Technological cooperation Base of the Ministry of Science and Technology(MOST)for clean Utilization of Hydrocarbon Resources Xi’an 710069China

The Ru/c catalyst prepared by impregnation method was used for hydrogenation of 3,5-dimethylpyridine in a trickle bed *** the same reduction conditions(300°c in H_(2)),the catalytic activity of the non-in-situ reduced Ru/c-n catalyst was higher than that of the in-situ reduced Ru/c-y ***,an in-situ H_(2)reduction and moderate oxidation method was developed to increase the catalyst ***,the influence of oxidation temperature on the developed method was *** catalysts were characterized by Brunauer–Emmett–Teller method,hydrogen temperature programmed reduction H_(2)-TPR,hydrogen temperature-programmed dispersion(H_(2)-TPD),X-ray diffraction,energy dispersive spectroscopy,X-ray photoelectron spectroscopy,Raman spectroscopy,O2 chemisorption and oxygen temperature-programmed dispersion(O2-TPD)*** results showed that there existed an optimal Ru/RuO_(x)ratio for the catalyst,and the highest 3,5-dimethylpyridine conversion was obtained for the Ru/c-i1 catalyst prepared by in-situ H_(2)reduction and moderate oxidation(oxidized at 100°c).Excessive oxidation(200°c)resulted in a significant decrease in the Ru/RuO_(x)ratio of the in-situ H_(2)reduction and moderate oxidized Ru/c-i2 catalyst,the interaction between RuO_(x)species and the support changed,and the hard-to-reduce RuO_(x)species was formed,leading to a significant decrease in catalyst *** developed in-situ H_(2)reduction and moderate oxidation method eliminated the step of the non-in-situ reduction of catalyst outside the trickle bed reactor.

关键词： Ru c catalyst in-situ H_(2)reduction and moderate oxidation in-situ reduction non-in-situ reduction hydrogenation of 3,5-dimethylpyridine

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

cooperative effects of Mo,V and Zr additions on the microstructure and properties of multi-elemental Nb-Si based alloys

引用

Journal of materials Science & Technology 2023年第1期132卷 27-41页

作者： Rui ma Xiping Guo State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Eight multi-elemental Nb-Si-based alloys with various Mo,V and Zr contents were prepared by vacuum non-consumable arc *** cooperative alloying effects of Mo,V and Zr on the arc-melted and heat-treated microstructure,mechanical properties as well as oxidation resistance at 1250°c of the alloys were evaluated *** results show that except for adding Mo solely,additions of Mo,V and Zr change the microstructure from eutectic to *** additions of Mo,V and Zr suppress the formation ofα(Nb,X)5 Si 3(“X”represents the alloying elements that substitute for Nb in the lattices),whilst promoting the formation ofγ(Nb,X)5 Si *** heat treatment at 1450°c for 50 h promotes the formation of(Nb,X)3 Si phase in the Zr-containing *** with either Mo or Zr improves,and their composite additions more obviously improve the compressive yield strength at 1250°c as well as the microhardness ofγ(Nb,X)5 Si *** room temperature fracture toughness of the alloys is enhanced by sole and composite additions of V and Zr,while it is deteriorated by the addition of *** sole addition of Mo,V or Zr improves the oxidation resistance at 1250°c,the composite additions of V with Mo/Zr(especially V-Mo-Zr)degrade the oxidation resistance at 1250°c.

关键词： Multi-elemental Nb-Si based ultrahigh temperature alloy Alloying effect Microhardness Room temperature fracture toughness High-temperature compressive yield strength Oxidation resistance

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

copper slag assisted coke reduction of phosphogypsum for sulphur dioxide preparation

引用

chinese Journal of chemical Engineering 2024年第1期65卷 43-53页

作者： Dong ma Qinhui Wang State Key Laboratory of clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The reduction of phosphogypsum(PG)to lime slag and SO_(2)using coke can effectively alleviate the environmental problems caused by ***,the PG decomposition temperature remains high and the product yield remains *** adding additives,the decomposition temperature can be further reduced and PG decomposition rate and product yield can be ***,the use of current additives such as fe_(2)O_(3)and SiO_(2)brings the problem of increasing economic ***,it is proposed to use solid waste copper slag(cS)as a new additive to reduce PG to prepare SO2,which can reduce the cost and meet the environmental benefits at the same *** effects of proportion,temperature and thermostatic time on PG decomposition are investigated by experimental and kinetic analysis combined with factSage thermodynamic calculations to optimize the roasting ***,the reaction mechanism is *** is found that adding cS to the coke and PG system can increase the rate of PG decomposition and SO_(2)yield while lowering the PG decomposition *** example,when the cS/PG mass ratio increases from 0 to 1,PG decomposition rate increases from 83.38%to 99.35%,SO_(2)yield increases from 78.62%to 96.81%,and PG decomposition temperature decreases from 992.4℃to 949.6℃.The optimal reaction parameters are cS/PG mass ratio of 1,coke/PG mass ratio of 0.06 at 1100℃for 20 min with 99.35%PG decomposition rate and 96.81%SO_(2) *** process proceeds according to the following reactions:2caSO_(4)+ 0.7c + 0.8fe_(2)SiO_(4)→0.8ca_(2)SiO_(4)+ 0.2ca_(2)fe_(2)O_(5)+ 0.4fe_(3)O_(4)+2SO_(2)+ 0.7cO_(2)finally,a process for decomposing PG with coke and cS is proposed.

关键词： Phosphogypsum Sulfur dioxide copper slag fluidized-bed Reduction Waste treatment

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

Development of a new continuous process for the production of 3,5-dimethylpiperidine

引用

chinese Journal of chemical Engineering 2022年第1期35卷 374-383页

作者： Tao Lin Xiaoxun ma School of chemical Engineering Northwest UniversityXi’an 710069China Kaili catalyst&New materials co. Ltd.Xi’an 710201China chemical Engineering Research center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi’an 710069China Shaanxi Research center of Engineering Technology for clean coal conversion Xi’an 710069China collaborative Innovation center for Development of Energy and chemical Industry in Northern Shaanxi Xi’an 710069China International Scientific and Technological cooperation Base of the Ministry of Science and Technology(MOST)for clean Utilization of Hydrocarbon Resources Xi’an 710069China

This paper developed a new clean continuous process for the hydrogenation of 3,5-dimethylpyridine(DPY)to 3,5-dimethylpiperidine(DPI)without solvent.A series of Ru/c catalysts were prepared by impregnation method,which were characterized by the BET,IcP,cO chemisorptions,XRD,SEM,EDS,TEM and *** effect of active species,loading,catalyst support,reaction temperature and pressure on the catalytic performance was *** influence of internal and external diffusion in the trickle-bed reactor(TBR)was basically eliminated by adjusting the particle size and dosage of the Ru/c *** reaction performance of the hydrogenation of DPY to DPI in the TBR and kettle reactor(KR)was compared,and the superiority of the TBR process was *** results show that this new continuous process developed in this study is an efficient way to realize the hydrogenation of DPY to DPI,and has a good industrial application prospect.

关键词： Trickle-bed reactor(TBR) Kettle reactor(KR) Hydrogenation 3,5-Dimethylpyridine(DPY) 3,5-Dimethylpiperidine(DPI)

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

A geometry characteristic of Banach spaces with c^1-norm

引用

frontiers of mathematics in china 2014年第5期9卷 1089-1103页

作者： Jipu ma Department of mathematics Nanjing University Nanjing 210093 China

Let E be a Banach space with the cl-norm｜｜·｜｜ in E／f, and let S（E） = {e ∈ E：｜｜e｜｜ = 1}. In this paper, a geometry characteristic for E is presented by using a geometrical construct of S（E）. That is,... 详细信息

Let E be a Banach space with the cl-norm｜｜·｜｜ in E／ma, and let S（E） = {e ∈ E：｜｜e｜｜ = 1}. In this paper, a geometry characteristic for E is presented by using a geometrical construct of S（E）. That is, the following theorem holds： the norm of E is of eI in E／ma if and only if S（E） is a c1 submanifold of E, with codimS（E） = 1. The theorem is very clear, however, its proof is non-trivial, which shows an intrinsic connection between the continuous differentiability of the norm ｜｜·｜｜ in E／ma and differential structure of S（E）.

关键词： Banach space geometry non-linear analysis global analysis

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

Global Existence and Blow-Up Results for a classical Semilinear Parabolic Equation

引用

chinese Annals of mathematics,Series B 2013年第4期34卷 587-592页

作者： Li ma Department of mathematics Henan Normal university

The author studies the boundary value problem of the classical semilinear parabolic equations

关键词： Positive solution Global existence Blow-up Omega limit

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

Quality and readability of online information resources on insomnia

引用

frontiers of Medicine 2017年第3期11卷 423-431页

作者： Yan ma Albert c. Yang Ying Duan Ming Dong Albert S. Yeung Division of Interdisciplinary Medicine and Biotechnology Department of Medicine Beth Israel Deaconess Medical Center Harvard Medical School Boston MA 02215 USA Sleep Medicine center Airforee General Hospital Beijing 100142 China IBM Software Development Lab Littleton MA 01460 USA Depression clinical and Research Program Massachusetts General Hospital Harvard Medical School Boston MA 02114 USA

The internet is a major source for health information. An increasing number of people, including patients with insomnia, search for remedies online; however, little is known about the quality of such information. This study aimed to evaluate the quality and readability of insomnia-related online information. Google was used as the search engine, and the top websites on insomnia that met the inclusion criteria were evaluated for quality and readability. The analyzed websites belonged to nonprofit, commercial, or academic organizations and institutions such as hospitals and universities. Insomnia-related websites typically included definitions （85%）, causes and risk factors （100%）, symptoms （95%）, and treatment options （90%）. cognitive behavioral therapy for insomnia （cBT-I） was the most commonly recommended approach for insomnia treatment, and sleep drugs are frequently mentioned. The overall quality of the websites on insomnia is moderate, but all the content exceeded the recommended reading ease levels. concerns that must be addressed to increase the quality and trustworthiness of online health information include sharing metadata, such as authorship, time of creation and last update, and conflicts of interest; providing evidence for reliability; and increasing the readability for a layman audience.

关键词： insomnia intemet readability information quality health literacy cognitive behavioral therapy treatment

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

Ionic Liquid Mediated Synthesis of Lath Shaped cuO Micro-Assembles as Extremely Stable Anode material for Lithium-Ion Batteries

引用

chinese Journal of chemistry 2017年第8期35卷 1299-1304页

作者： man Wang Ruguang ma Ying Liu c.Y. chung Yonghong Deng Zhouguang Lu Department of materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China State Key Laboratory of High Performance ceramics and Superfine Microstrueture Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China Department of Physics and materials Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China

A novel lath-shaped cuO microassemble consisting of well-crystalized ultrafine nanocrystals was prepared by an ionothermal method with the assistance of ionic liquids （ILs, 1-butyl-3-methylimidazolium tetrafluoroborate）. As anode material of lithium ion batteries, the ILs-cuO exhibits high specific capacity, durability and good rate per- formance, superior to bare cuO. At a high current density of 1000 ma·g^-1, after 100 cycles, ILs-cuO still retains a discharge capacity of 483.2 mah·g^-1. The improved electrochemical performances could be ascribed to the unique microscale lath-shape cuO assembles composed of ultrafine nanostructure.

关键词： lithium ion batteries anode lath-shaped cuO micro-assembles ionic liquid

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

Preparation of Pt/γ-Al2O3-c Heterogeneous catalyst for Highly Selective Hydrogenation of cinnamaldehyde Towards cinnamyl Alcohol

引用

chemical Research in chinese Universities 2017年第4期33卷 660-665页

作者： ma Jun Sichuan Province Institutions of Higher Education and Key Laboratory of Land Resources Evaluation and Monitoring in Southwest Ministry of Education Chengdu 610068 P. R. China

A Pt/γ-Al2O3-c heterogeneous catalyst with improved catalytic performance was successfully prepared. Bayberry talmin（BT）, an abundant natural plant polyphenol, was utilized to modifiy the surface of the Pt/γ-Al2O3 matrix and then stabilize Pt nanoparticles（NPs）. The catalyst was systematically and specifically characterized by a collec- tion of analytic tools including XRD, XPS, fTIR, TEM, and TG. It was found that the Pt NPs were envenly dispered on the γ-Al2O3-c matrix. Meanwhile, when the catalyst was applied for selective hydrogenation of cilmamalde- hyde（cma） in the presence of KOH promoter in solvent, excellent catalytic performance was obtained. The selecti- vity to cinnamyl alcohol（cMO） reached 97.88% with 88.45% cma conversion within 30 min in the presence of 0.037 mol/L KOH, without significant loss of catalytic activity even under cyclic measurements for 5 times. The excelleut catalytic performances should be ascribed predominantly to the uniform and stable dispersion ofPt NPs on the γ-Al2O3-c matrix and the excellent heat stability of BT.

关键词： Heterogeneous catalyst Pt/γ-Al2O3-c Barberry tannin Selective hydrogenation ciunamaldehyde

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

家族性高胆固醇血症国内外诊疗异同

引用

中国全科医学 2025年第6期28卷 655-665页

作者：马弘阳岳岸娜孙康云南京医科大学附属苏州市立医院心血管内科江苏省苏州市215000

家族性高胆固醇血症(fH)是一种常见的遗传代谢性疾病,主要特征是低密度脂蛋白胆固醇(LDL-c)异常升高,可表现为角膜弓、黄色瘤等症状。长期高水平的LDL-c会增加动脉粥样硬化性心血管疾病(AScVD)的风险。fH患者早发AScVD的风险较高,纯合型... 详细信息

家族性高胆固醇血症(fH)是一种常见的遗传代谢性疾病,主要特征是低密度脂蛋白胆固醇(LDL-c)异常升高,可表现为角膜弓、黄色瘤等症状。长期高水平的LDL-c会增加动脉粥样硬化性心血管疾病(AScVD)的风险。fH患者早发AScVD的风险较高,纯合型的fH病情更为严重。全球fH的流行率逐渐受到重视,但诊断和治疗仍存在不足。借着《2023年中国血脂管理指南》的发布,本文主要比较了国内外关于fH筛查、诊断的不同,用于强调筛查血脂情况的重要性,并建议早期识别fH患者。同时,基因检测也被推荐,不仅限于少数基因,还应包含其他相关基因或全基因组检测。此外,本文也比较了不同指南对于fH患者LDL-c控制管理水平的差异,以及对于不同LDL-c划分的AScVD危险因素新要素;比较了不同指南在饮食、生活方式、药物控制等方面的差别,指出国内外一致认为他汀类药物是主要的降脂药物,联合应用尤为重要,但对于最大剂量后LDL-c控制未达标的患者国际血脂护理指南有一定更新。同时,对于纯合型fH(HofH)患者,高强度他汀类药物联合其他药物治疗是首选,早期的治疗更为关键,适当提早脂蛋白单采术与前蛋白转换酶枯草溶菌素9(PcSK9)抑制剂的应用有助于降低AScVD的发病率和死亡率。

关键词：高胆固醇血症分子基础诊断诊疗方案指南差异

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

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：