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基于Brusselator模型的黄河流域创新生态系统耗散结构研究

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人民黄河 2024年第7期46卷 112-118页

作者：吴艳霞杨帅帅蒋明月邱乐西安理工大学经济与管理学院陕西西安710054

为探究黄河流域创新生态系统的耗散演化特征,以流域九省(区)为实证对象探究其创新生态系统耗散结构特性、形成过程及演化格局。依据耗散结构理论演绎创新生态系统耗散结构特征及形成过程,通过Brusselator模型转译推导创新生态系统耗散水... 详细信息

为探究黄河流域创新生态系统的耗散演化特征,以流域九省(区)为实证对象探究其创新生态系统耗散结构特性、形成过程及演化格局。依据耗散结构理论演绎创新生态系统耗散结构特征及形成过程,通过Brusselator模型转译推导创新生态系统耗散水平,结合熵权Topsis法测度黄河流域2011—2020年创新生态系统耗散水平,并对其时空演化格局进行了研究。结果表明:创新生态系统的动态演化过程符合耗散结构形成条件;黄河流域创新生态系统耗散水平虽然总体上呈逐年上升态势,但在研究期内均未形成耗散结构;相较于创新投入,创新地景是致其耗散水平低的制约因素;黄河流域创新生态系统耗散水平呈现“下游引领、中游跟随、上游追赶”的阶层状分布格局。

关键词：创新生态系统耗散结构 Brusselator模型熵权Topsis法黄河流域

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半封闭空间内氢化镁粉尘爆炸火焰的传播特性

爆炸与冲击 2024年第6期44卷 172-182页

作者：毛文哲张国涛杨帅帅徐子晖王燕纪文涛河南理工大学安全科学与工程学院河南焦作454003 河南理工大学河南省燃爆动力灾害预警与应急工程技术研究中心河南焦作454003 河南理工大学煤炭安全生产与清洁利用省部共建协同创新中心河南焦作454003

在自行搭建的5 L粉尘爆炸火焰传播特性实验装置中,实验研究了半封闭空间内氢化镁(MgH_(2))粉尘爆炸火焰的传播特性。实验结果表明:随MgH_(2)粉尘浓度的提高,MgH_(2)粉尘爆炸火焰由点火至稳定传播所用时间先缩短后延长以及预热区宽度先... 详细信息

在自行搭建的5 L粉尘爆炸火焰传播特性实验装置中,实验研究了半封闭空间内氢化镁(MgH_(2))粉尘爆炸火焰的传播特性。实验结果表明:随MgH_(2)粉尘浓度的提高,MgH_(2)粉尘爆炸火焰由点火至稳定传播所用时间先缩短后延长以及预热区宽度先减小后增大,火焰亮度、锋面平滑度、及火焰传播速度呈先提高后降低的趋势,并在质量浓度为800 g/m^(3)时呈最佳燃烧状态。不同浓度的MgH_(2)粉尘爆炸火焰传播瞬时速度整体呈波动趋势,波动幅度随浓度的提高而先减小后增大,800 g/m^(3)时波动幅度最小,瞬时传播速度变化趋势随浓度的变化呈现不同的变化趋势。最后,根据MgH_(2)爆炸产物的XRD测试结果,分析MgH_(2)粉尘爆炸反应机理,发现MgH_(2)粉尘爆炸是以MgH_(2)燃烧反应为主并伴随有MgH_(2)和Mg(OH)2分解以及Mg和H_(2)氧化等多个总包反应的复杂过程,爆炸反应的最终产物为MgO。

关键词：半封闭空间储氢金属氢化镁爆炸火焰传播

Measurement and correlation of the solubility of sodium acetate in eight pure and binary solvents

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Chinese Journal of Chemical Engineering 2022年第4期35卷 474-484页

作者： Xi Wu shuaishuai yang Shiming Xu Xinjie Zhang Yujie Ren Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024China

The knowledge of solubility of a salt in either the pure solvent or blend solvent is of great importance for studying or operating the crystallization,extraction,and distillation *** solubility of sodium acetate(NaAc)in four pure solvents(water,ethanol,acetic acid and 2,2,2-trifluoroethanol)and four binary solvents(water–ethanol,water-acetic acid,acetic acid–ethanol,and acetic acid-ethyl acetate)were measured by using the laser dynamic method at temperatures from 288.15 K to 338.15 K at 0.1 *** results showed that the solubility of NaAc was influenced by either the solution temperature or solvent *** aqueous sodium acetate solution possessed the maximal solubility under the experimental *** solubility of NaAc in 2,2,2-trifluoroethanol was found to be decreased with the increase of the solution ***,the solubilities of NaAc in other seven solvents increased as the solution temperature was ***,five correlation models,including the van’t Hoff model,modified Apelblat model,Yaws model,λh model,and modified Apelblat-Jouyban-Acree model were used to correlate the solubility data of those sodium acetate solutions with acceptable deviation,***,van’t Hoff analysis method was selected to analyze the change law of thermodynamic properties of a salt during the dissolution process.

关键词： Solubility Sodium acetate Solution Water Solvent

基于LBS+微波暗室的GNSS接收机检定方法的研究

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测绘技术装备 2024年第2期26卷 114-118页

作者：杨晓磊梁琦赵越杨帅帅广西壮族自治区自然资源产品检验中心广西南宁530200 广西壮族自治区计量检测研究院广西南宁530007 自然资源部第一大地测量队陕西西安710054

随着市场对全球导航卫星系统(GNSS)接收机检定需求的增加及室外检定环境的影响,提高GNSS接收机的检定效率和降低工作成本成为现阶段面临的一个难题。为此,本文提出应用信号接收器+微波暗室组合的方式对GNSS接收机进行室内静态模拟检定... 详细信息

随着市场对全球导航卫星系统(GNSS)接收机检定需求的增加及室外检定环境的影响,提高GNSS接收机的检定效率和降低工作成本成为现阶段面临的一个难题。为此,本文提出应用信号接收器+微波暗室组合的方式对GNSS接收机进行室内静态模拟检定。该组合方式通过基于位置服务(LBS)+微波暗室法对GNSS接收机的静态基线误差等进行试验,可确保GNSS接收机检定符合相关规程要求,且所获检测结果与传统室外检定法的测量结果基本一致,有效提高了检定效率,为GNSS接收机检定提供了新思路。

关键词： GNSS接收机基线解算误差分析

Deep reinforcement with spectrum series learning control for a mode-locked fiber laser

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Photonics Research 2022年第6期10卷 1491-1500页

作者： ZHAN LI shuaishuai yang QI XIAO TIANYU ZHANG YONG LI LU HAN DEAN LIU XIAOPING OUyang JIANQIANG ZHU Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China

A spectrum series learning-based model is presented for mode-locked fiber laser state searching and *** mode-locked operation search policy is obtained by our proposed algorithm that combines deep reinforcement learning and long short-term memory *** simulations show that the dynamic features of the laser cavity can be obtained from spectrum *** with the traditional evolutionary search algorithm that only uses the current state,this model greatly improves the efficiency of the mode-locked *** switch of the mode-locked state is realized by a predictive neural network that controls the pump *** the experiments,the proposed algorithm uses an average of only 690 ms to obtain a stable mode-locked state,which is one order of magnitude less than that of the traditional *** maximum number of search steps in the algorithm is 47 in the 16°C–30°C temperature *** pump power prediction error is less than 2 mW,which ensures precise laser locking on multiple operating *** proposed technique paves the way for a variety of optical systems that require fast and robust control.

关键词： fiber pump mode

Tian Demei:Great National Craftsmen Forum Winner

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China News Release 2023年第5期 64-66页

作者： Huang Xiaoyun yang shuaishuai 不详

It was a rotor that was 16.198 meters in diameter and 3.826 meters in height,witha hoisting weight of 2,100 *** installing the water-turbine generator set for the Baihetan Hydropower Station on the Jinsha River,the upper section of the yangtze River in southwest China,it was well known that the hardest part of the job would be hoisting this massive rotor of the set's first unit into a pit with only 51 mm of spacing available at the *** then,no one believed that an overhead crane operator could complete the task.

关键词： spacing southwest install

Smart materials for safe lithium-ion batteries against thermal runaway

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Journal of Energy Chemistry 2024年第7期94卷 360-392页

作者： Yu Ou Pan Zhou Wenhui Hou Xiao Ma Xuan Song shuaishuai Yan yang Lu Kai Liu Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

In recent years,the new energy storage system,such as lithium ion batteries(LIBs),has attracted much *** order to meet the demand of industrial progress for longer cycle life,higher energy density and cost efficiency,a quantity of research has been conducted on the commercial application of ***,it is difficult to achieve satisfying safety and cycling performance *** may be thermal runaway(TR),external impact,overcharge and overdischarge in the process of battery abuse,which makes the safety problem of LIBs more *** this review,we summarize recent progress in the smart safety materials design towards the goal of preventing TR of LIBs reversibly from different abuse *** from smart responsive materials and novel structural design,the safety of LIBs can be improved a *** expect to provide a comprehensive reference for the development of smart and safe lithium-based battery materials.

关键词： Lithium ion batteries(LIBs) Thermal runaway(TR) Smart materials Safe batteries Solid electrolyte interface(SEI)

Solubility of Potassium Acetate in Water,2,2,2-Trifluoroethanol,Ethanol and Their Binary Mixtures at 288.15—333.15 K

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Chemical Research in Chinese Universities 2020年第5期36卷 921-926页

作者： WU Xi yang shuaishuai XU Shiming ZHANG Xinjie Key Laboratory of Ocean Energy Utilization and Energyf Conseration of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024P.R.China

The potassium acetate solutions are new potential working fluids for the closed-type reverse electrodialy-sis(RED)power generation system driven by thennal *** this paper,the solubilities of potassium acetate in water,2,2,2-trilluoroethaiiol,ethanol and their binary mixtures were measured by using the laser dynamic method over the temperature range of 288.15 to 333.15 K under atmospheric *** results indicate that the solubility of potassium acetate solution is influenced by both the solvent components and solution temperature ***,it is found that the measured solubility data of the potassium acetate-water-2,2,2-trifluoroethanol solutions as per the laser dynamic method are sliglitly larger than that of the data obtained as per the static ***,five correlation models,including the Van?t Hoff model,Modified Apelblat model,Yaws model,A/z model and Modified Apelblat-Jouyban-Acree model,were used to correlate the measured solubility data of those potassium acetate solutions,with the relative standard deviations within 0.23%to 1.58%.

关键词： Solubility Electrolyte Solvent Potassium acetate

Coal-based activated carbon prepared by H2O activation process for supercapacitors using response surface optimization method

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Frontiers of Chemical Science and Engineering 2024年第6期18卷 31-40页

作者： Shanxin Xiong Fengyan Lv Chenxu Wang Nana yang Yukun Zhang Qingyong Duan shuaishuai Bai Xiaoqin Wang Zhen Li Jianwei Xu College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and ResourcesXi’an 710021China Institute of Sustainability for Chemicals Energy and EnvironmentJurong Island 627833Singapore

The scalable production of high grade activated carbon from abundant coal for supercapacitors application is an efficient way to achieve high value-added utilization of coal ***,this technology is challenging due to lack of comprehensive understanding on the mechanism of activation process and effect of external *** this paper,the effect of activating temperature and time on the specific capacitance of coal-based activated carbon prepared by H2O steam activation was studied using the response surface *** optimal conditions,coal-based activated carbon exhibits the largest specific capacitance of 194.35 F·g^(−1),thanks to the appropriate pore/surface structure and defect *** functional theory calculations explain in detail the mechanism of contraction of aromatic rings and overflow of H2 and CO during the ***,oxygen-containing functional groups are introduced,contributing to the pseudocapacitance property of coal-based activated *** mechanism of reactions between aromatic carbon and H2O vapor provides understanding on the role of water during coal processing at the molecular level,offering great potential to regulate product distribution and predict rate of pore *** insight would contribute to the advancement of other coal processing technology such as gasification.

关键词： response surface optimization coal-based activated carbon supercapacitor activating mechanism