检索结果-南通市图书馆

Synthesis and Performance of an Associative Anti-shear Drag Reducer Based on Hydrogen Bond Association of Dodecyl Methacrylate

引用

China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 23-33页

作者： Lu Yong li chenhao li Hao Chen Yue Xu Dan Wang Yiran Meng Yeqiao Zhang Xiaolai School of Chemistry and Chemical Engineering Shandong UniversityJinan 250061China PipeChina Eastern China Crude Oil Storage and Transportation Co. Ltd.Science and Technology R&D CenterXuzhou 221008China Shandong Dongyue Polymer Material Co. Ltd.Zibo 256401China State Key Lab of Fluorinated Functional Membrane Materials Zibo 256401China

Using K2S2O8-Na2SO3 as the redox initiation system,a hydrogen-bond-association-based dodecyl methacrylate system associative anti-shear drag reducer was synthesised by standard emulsion *** reaction process was simple and gentle as well as safe and *** design was carried out using molecular dynamics simulation *** results of infrared spectroscopy,thermogravimetric analysis,differential scanning calorimetry,gel chromatography,and laser light scattering showed that the reaction polymerisation was relatively complete,the product was uniform,the molecular weight distribution was controllable,and the synthesised polymer had good *** donor lauryl methacrylate-styrene-methacrylic acid(LMA-St-MAA)and acceptor lauryl methacrylate-styrene-dimethylaminoethyl methacrylate(LMA-St-DMA)polymers had an associative intermolecular interaction force,which increased the molecular cluster size of the associative system *** complex had good shear resistance,and the test results of the tube pump shear test showed that the synthesised associative oil-soluble polymer drag reduction system exhibited better drag reduction rate performance than poly-α-olefins over repeated *** research results provide a reference plan for minimising the number of station-to-station inputs,thereby ensuring the stability of oil pipelines and reducing transportation costs.

关键词： drag reducer associative effect drag reduction rate shear resistance

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

Preparation of Poly-α-Olefin Microcapsule Particles Coated with Polyurethane as a Drag Reducer Based on Interface Polymerization

引用

China Petroleum Processing & Petrochemical Technology 2023年第2期25卷 101-112页

作者： li chenhao Lu Yong li Hao Chen Yue Meng Yeqiao Zhou Pengfei Xu Dan Wang Yiran Zhang Xiaolai Shandong University Jinan 250100China PipeChina Eastern China Crude Oil Storage and Transportation Co. LtdScience and Technology R&D CenterXuzhou 221000China Shandong Dongyue Polymer Material Co. Ltd.Zibo 256401China State Key Lab of Fluorinated Functional Membrane Materials Zibo 256401China

The molecular behavior of polyurethane(PU)coating materials during the surface adsorption of poly-α-olefin as a drag reducing polymer was explored by a molecular dynamics *** different PU capsule wall materials were synthesized using two reaction monomers,and a poly-α-olefin/PU drag reducer microcapsule was prepared based on interface *** structure,morphology,thermal stability,compressive strength,and drag reduction performance of the microcapsules were characterized and *** results showed that a non-bonding interaction induced the adsorption of the PU coating material,poly-α-olefin and PU then fused at the interface,and the PU coating material was embedded into the inner grooves of poly-α-olefin in the form of a local mosaic,thereby forming a stable core–shell *** morphological characterization indicated that PU and poly-α-olefin could form microcapsule *** thermal decomposition temperature of the microcapsule was dependent on the type of capsule wall *** microcapsule structure had a slight effect on poly-α-olefin drag *** system enabled poly-α-olefin to exist in powdered particles through microcapsulation,and had a good dispersion effect that facilitated storage and transport *** method effectively inhibited the accumulation and bonding of poly-α-olefin at room temperature.

关键词： drag reducer poly-α-olefin polyurethane microcapsules particles interfacial polymerization

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

Provenance Documentation to Enable Explainable and Trustworthy AI:A literature Review

引用

Data Intelligence 2023年第1期5卷 139-162页

作者： Amruta Kale Tin Nguyen Frederick C.Harris Jr. chenhao li Jiyin Zhang Xiaogang Ma Department of Computer Science Universityof IdahoMoscowID83844USA Department of Computer Science and Engineering University of NevadaRenoRenoNV 89557USA

Recently artificial intelligence(AI)and machine learning(ML)models have demonstrated remarkable progress with applications developed in various *** is also increasingly discussed that AI and ML models and applications should be transparent,explainable,and ***,the field of Explainable AI(XAI)is expanding *** holds substantial promise for improving trust and transparency in AI-based systems by explaining how complex models such as the deep neural network(DNN)produces their ***,many researchers and practitioners consider that using provenance to explain these complex models will help improve transparency in AI-based *** this paper,we conduct a systematic literature review of provenance,XAI,and trustworthy AI(TAI)to explain the fundamental concepts and illustrate the potential of using provenance as a medium to help accomplish explainability in AI-based ***,we also discuss the patterns of recent developments in this area and offer a vision for research in the near *** hope this literature review will serve as a starting point for scholars and practitioners interested in learning about essential components of provenance,XAI,and TAI.

关键词： Explainable AI Trustworthy AI Provenance documentation Workflow platforms Data science

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

Insights into the Reaction Network and Mechanism of Green Aerobic Oxidative Esterification of Methacrolein over Different Heterogeneous Catalysts

引用

China Petroleum Processing & Petrochemical Technology 2021年第3期23卷 1-11页

作者： li chenhao Xia Changjiu liu Yujia Huang Kaimeng Peng Xinxin liu Jinsheng lin Min Zhu Bin Luo Yibin Shu Xingtian State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083

The oxidative esterification of methacrolein(MAL)is an important way to prepare high-valued methyl methacrylate(MMA),but this process is ultra-complex due to the high reactivity of both C=O and C=C bonds in MAL *** order to further improve MMA selectivity,the reaction network and relevant mechanisms have been proposed and profoundly investigated in this *** kinds of fundamental reactions are involved in this process,including(a)the acetal reaction;(b)the aerobic oxidation of hemiacetal;(c)the alkoxylation of C=C double bond;(d)the Diels-Alder reaction;and(e)the hydrogenation reaction of unsaturated double *** them,the Diels-Alder reaction of MAL is non-catalyzed,and the Brönsted acid sites or the Lewis acid sites favor promoting acetal reaction of MAL with methanol,while the alkoxylation of C=C bond with methanol is enhanced under alkaline *** particular,by employing the Pd-based catalysts,hydrogenation products are formed in alkaline methanol solution,hence with lower than those obtained by the Au-based ***,it is necessary to match the hemiacetal fromation and aerobic oxidation of hemiacetal,which is relevant with the amount and strength of acid and redox ***,this work can provide a good guidance for the further design of both catalysts and processes in future.

关键词： methacrolein oxidative esterification mechanism reaction network methyl methacrylate

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

Ultrafast Modulation of the Molten Metal Surface Tension under Femtosecond Laser Irradiation

引用

Chinese Physics Letters 2022年第7期39卷 117-122页

作者： chenhao li Hongtao liang Yang Yang Zhiyong Yu Xin Zhang Xiangming Ma Wenliang Lu Zhenrong Sun Ya Cheng State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

We predict ultrafast modulation of the pure molten metal surface stress fields under the irradiation of the single femtosecond laser pulse through the two-temperature model molecular-dynamics simulations. High-resolution and precision calculations are used to resolve the ultrafast laser-induced anisotropic relaxations of the pressure components on the time-scale comparable to the intrinsic liquid density relaxation time. The magnitudes of the dynamic surface tensions are found being modulated sharply within picoseconds after the irradiation, due to the development of the nanometer scale non-hydrostatic regime behind the exterior atomic layer of the liquid *** reported novel regulation mechanism of the liquid surface stress field and the dynamic surface tension hints at levitating the manipulation of liquid surfaces, such as ultrafast steering the surface directional transport and patterning.

关键词： red profile Gibbs Ultrafast Modulation of the Molten Metal Surface Tension under Femtosecond Laser Irradiation

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

Flexible control strategy for HVDC transmission system adapted to intermittent new energy delivery

引用

Global Energy Interconnection 2021年第4期4卷 425-433页

作者： chenhao li Kuan li Changhui Ma Pengfei Zhang Qi Tao Yingtao Sun Xin Wang State Grid Shandong Electric Power Research Institute JinanP.R.China State Grid International Development limited BeijingP.R.China State Grid Jinan Power Supply Company JinanP.R.China Independent Power Transmission Operator S.A. 89 Dyrrachiou Str.&Kifisou 10443AthensGreece

Intermittent new energy delivery requires increasing the flexibility of ultra-high voltage direct current(DC)power *** on a converter steady-state model and a DC power model,the control angle constraints of a converter valve are relaxed for power *** this paper,a flexible DC power control method based on a fixed tap changer position is *** initial ratio of the converter transformer is *** effects of the fixed-tap changer position control on the control angle,reactive power compensation,and commutation failure are *** new control method allows a DC system to operate at a large angle and increase the additional reactive power loss while improving the commutation security ***-state and electromagnetic transient simulations in the CIGRE test system verify the validity of the method proposed in this paper and the correctness of the analysis conclusions.

关键词： Tap changer DC power Firing angle Reactive power compensation Extinction angle Commutation failure

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

Baosteel's No.8 air separation unit and the practice of its system commissioning

引用

Baosteel Technical Research 2009年第3期3卷 23-26页

作者： ZHOU chenhao CAI Lemin li Zhengqiang Energy ＆ Environment Department Baoshan Iron ＆ Steel Co.Ltd. Shanghai 200941 China

This paper introduces the process flow, technical parameters and relevant features of Baosteel＇s No. 8 air separation unit （ASU） with a capacity of 60000m^3/h. It summarizes the commissioning work, which includes the adjustment of the air compressor,the system＇s naked cooling,the precooling system and the operation adjustment. It also provides detailed analyses on some failures which occurred in the commissioning. Through the modification of the design and the interlocks, the tripping probability of the air compressor was greatly reduced. Through the heating of the system and the control of the water cooler＇s nitrogen flow,the overproof content of carbon dioxide and fluctuation of oxygen flow were avoided. Nitrogen-block in the argon system was eliminated by the precise control of the argon rectification flow and argon content. All these solutions have been proved to be effective by practice.

关键词： air separation unit commissioning malfunction solution

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

Data-driven distributionally robust optimization for PVC Plant Planning under uncertainty of energy consumption

Data-driven distributionally robust optimization for PVC Pla...

引用

第43届中国控制会议

作者： chenhao li Yuhong Wang College of Control Science and Engineering China University of Petroleum

This paper studies the planning optimization problem of PVC production process with calcium carbide energy consumption uncertainty. A data-driven Wasserstein distributionally robust optimization approach is proposed to deal with the energy consumption uncertainty in PVC production planning. Firstly, the kernel density estimation technique is used to extract the distribution information of uncertain data of carbide furnace single consumption. Then, a support set was established using flexible uncertainty sets, and an ambiguity set was established based on Wasserstein distance to establish a distributionally robust model for the PVC production process. Finally, a PVC industry case shows that the proposed method can effectively reduce the cost of energy consumption and improve the robustness of PVC production planning under the uncertain factors of energy consumption.

关键词： PVC uncertainty energy consumption distributionally robust optimization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Spatiotemporal variation in snow cover and its effects on grassland phenology on the Mongolian Plateau

引用

Journal of Arid Land 2021年第4期13卷 332-349页

作者： SA Chula MENG Fanhao LUO Min li chenhao WANG Mulan ADIYA Saruulzaya BAO Yuhai College of Geographical Science Inner Mongolia Normal UniversityHohhot 010022China Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information System Inner Mongolia Normal UniversityHohhot 010022China Institute of Geography and Geoecology Mongolian Academy of ScienceUlaanbaatar 15170Mongolia

Snow cover is an important water source for vegetation growth in arid and semi-arid areas,and grassland phenology provides valuable information on the response of terrestrial ecosystems to climate *** Mongolian Plateau features both abundant snow cover resources and typical grassland *** recent years,with the intensification of global climate change,the snow cover on the Mongolian Plateau has changed correspondingly,with resulting effects on vegetation *** this study,using MOD10A1 snow cover data and MOD13A1 Normalized Difference Vegetation Index(NDVI)data combined with remote sensing(RS)and geographic information system(GIS)techniques,we analyzed the spatiotemporal changes in snow cover and grassland phenology on the Mongolian Plateau from 2001 to *** correlation analysis and grey relation analysis were used to determine the influence of snow cover parameters(snow cover fraction(SCF),snow cover duration(SCD),snow cover onset date(SCOD),and snow cover end date(SCED))on different types of grassland *** results showed wide snow cover areas,an early start time,a late end time,and a long duration of snow cover over the northern Mongolian ***,a late start,an early end,and a short duration were observed for grassland phenology,but the southern area showed the opposite *** SCF decreased at an annual rate of 0.33%.The SCD was shortened at an annual rate of 0.57 *** SCOD and SCED in more than half of the study area advanced at annual rates of 5.33 and 5.74 DOY(day of year),*** grassland phenology,the start of the growing season(SOS)advanced at an annual rate of 0.03 DOY,the end of the growing season(EOS)was delayed at an annual rate of 0.14 DOY,and the length of the growing season(LOS)was prolonged at an annual rate of 0.17 *** SCF,SCD,and SCED in the snow season were significantly positively correlated with the SOS and negatively correlated with the EOS and *** SCOD was significantly negative

关键词： snow cover fraction snow cover phenology vegetation phenology grey relation grade climate change Mongolian Plateau

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

Enhancing Resistance to Bacterial Blight in Rice Using CRISPR-based Base Editing Technology

Enhancing Resistance to Bacterial Blight in Rice Using CRISP...

引用

中国植物病理学会2024年学术年会

作者： li chenhao liU Bo DONG Hansong YANG Bing Division of Plant Sciences University of Missouri Department of Plant Pathology Nanjing Agricultural University Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects Institute of BiotechnologyZhejiang University College of Plant Protection Shandong Agricultural University

Bacterial blight(BB),caused by Xanthomonas oryzae pathovar oryzae(Xoo),poses a significant threat to rice production,particularly in Asia and West *** resistance against BB in elite rice varieties is crucial to advancing rice breeding program and supporting smallholder *** Activator-like effectors(TALes) are key virulence factors in Xoo,with some targeting the susceptibility(S) genes such as the sugar transporter SWEET genes in *** this,SWEET14 is an important S genes,with its promoter binding by the TALe TalC which exists across all sequenced African Xoo *** the present study,we utilized CRISPR/Cas9-based cytidine and adenine base editors to alter the effector binding element(EBE) of TalC in the promoter of SWEET14 in rice cultivars Kitaake,IR24,and Zhonghua *** introducing C to T changes in EBE led to reduced SWEET14 induction by TalC-containing Xoo strains,resulting in resistance to African Xoo isolates reliant on TalC for ***,A to G changes retained SWEET14 inducibility and susceptibility to Xoo in edited ***,no off-target mutations were detected at predicated sites,and the edited lines exhibited no obvious defects in major agronomictraits in *** results underscore the effectiveness of base editing systems for both molecular biology research and crop improvement endeavors.

关键词： Base editing base editors CBE and ABE rice improvement bacterial blight resistance

来源： cnki会议评论

在线全文

cnki会议

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：