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优化设计萃取隔板精馏塔分离苯-环己烯体系

化学工程 2024年第7期52卷 1-6页

作者：张豪豪李运昌刘宇航刘继三陈锦溢华超陆平中国科学院过程工程研究所绿色过程与工程重点实验室北京100190 中国科学院大学化学工程学院北京100049 宁夏福泰材料科技有限公司宁夏石嘴山753600 华陆工程科技有限责任公司陕西西安710065

苯和环己烯共沸物的高效节能分离是常见的工业难题,而EDWC(萃取隔板精馏塔)在共沸物的分离中具有重要的应用前景,目前公开的文献中鲜有关于EDWC工艺对苯和环己烯分离的报道。以氯化胆碱/乙酰丙酸摩尔比为1∶2作为萃取剂,探索EDWC技术在... 详细信息

苯和环己烯共沸物的高效节能分离是常见的工业难题,而EDWC(萃取隔板精馏塔)在共沸物的分离中具有重要的应用前景,目前公开的文献中鲜有关于EDWC工艺对苯和环己烯分离的报道。以氯化胆碱/乙酰丙酸摩尔比为1∶2作为萃取剂,探索EDWC技术在苯和环己烯分离中的应用,采用粒子群算法对该工艺进行优化设计。考虑到粒子群算法是一种随机优化算法,引入变异系数对算法的稳定性能进行评价。最后,引入年度总成本、二氧化碳排放量、[火用]损失3个定量指标从经济性、环境性和热力学性3个方面对EDWC工艺和传统的两塔萃取精馏工艺进行全面对比。结果表明:与传统的两塔萃取精馏工艺相比,EDWC工艺可减少19.15%的年度总成本、36.08%的二氧化碳排放量、19.99%的[火用]损失以及8.03%的萃取剂消耗量。EDWC工艺分离苯和环己烯混合物具有优异的分离效率和显著的节能优势。

关键词：萃取隔板精馏塔优化设计节能 Aspen Plus 粒子群算法

Potential Effects of Desalinated Seawater on Arteriosclerosis in Rats

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Biomedical and Environmental Sciences 2017年第10期30卷 762-766页

作者： DUAN Lian zhang Li Xia zhang Shao ping KONG Jian ZHI Hong zhang Ming LU Kai zhang Hong Wei Department of Toxicology Institute for Environmental Health and Related Product SafetyChinese Center for Disease Control and PreventionBeijing 100021China Chinese Center for Disease Control and Prevention Beijing 102206China

To evaluate the potential risk of arteriosclerosis caused by desalinated seawater, Wistar rats were provided desalinated seawater over a 1-year period, and blood samples were collected at 0, 90, 180, and 360 days. Blood calcium, magnesium, and arteriosclerosis-related indicators were investigated. Female rats treated with desalinated seawater for 180 days showed lower magnesium levels than the control rats （P 〈 0.05）. The calcium and magnesium levels in female rats and the magnesium level in male rats were lower than the levels in the controls, following treatment with desalinated seawater for 360 days （P 〈 0.05）. Blood levels of arteriosclerosis-related lipid peroxidation indicators and C-reactive protein （CRP） in the treatment group did not differ from those in the controls. The levels of lipid peroxidation indicators and CRP in rats were not significantly affected by drinking desalinated seawater, and no increase in risk of arteriosclerosis was observed.

关键词： Desalinated seawater Lipid peroxidation CRP Arteriosclerosis

Generating routes for autonomous driving in vehicle-to-infrastructure communications

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Digital Communications and Networks 2020年第4期6卷 444-451页

作者： Jianjun Yang Tinggui Chen Bryson Payne ping Guo Yanping zhang Juan Guo Department of Computer Science and Information Systems University of North GeorgiaOakwood30566USA Zhejiang Gongshang University HangzhouChina Department of Computer Science and Information Systems University of North GeorgiaDahlonega30597USA Department of Computer Science University of Illinois at SpringfieldSpringfieldILUSA Department of Computer Science Gonzaga UniversitySpokaneWAUSA

The study of vehicular networks has attracted considerable interest in academia and the *** the broad area,connected vehicles and autonomous driving are technologies based on wireless data communication between vehicles or between vehicles and infrastructures.A Vehicle-to-Infrastructure(V2I)system consists of communications and computing over vehicles and related *** such a system,wireless sensors are installed in some selected points along roads or driving *** autonomous driving,it is crucial for a vehicle to figure out the ideal routes by the communications between its equipped sensors and infrastructures then the vehicle is automatically moving along the *** this paper,we propose a Bezier curve based recursive algorithm,which effectively creates routes for vehicles through the communication between the On-Board Unit(OBU)and the Road-Side Units(RSUs).In addition,this approach generates a very low *** conduct simulations to test the proposed algorithm in various *** experiment results demonstrate that our algorithm creates almost ideal routes.

关键词： Autonomous driving Vehicles and infrastructures Bezier curve Recursive algorithm On board unit Road side unit

乙二酸四乙酸二钠盐改性枸杞杆生物炭对亚甲基蓝吸附性能

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应用化学 2024年第7期41卷 1035-1046页

作者：任艳娇徐荣声王萍孙冬耿万东张海永宁夏大学新华学院银川750021 北方民族大学化学与化工学院银川750411 中国矿业大学(北京)化学与环境工程学院北京100083

以H_(3)PO_(4)为活化剂,通过高温炭化法将宁夏枸杞杆制备成生物质活性炭(CP),并利用乙二酸四乙酸二钠盐(EDTA-2Na)对其进行表面改性,得到氮掺杂活性炭(CPE)。利用比表面积分析(BET)、X射线衍射仪(XRD)、X射线光电子能谱分析仪(XPS)、傅... 详细信息

以H_(3)PO_(4)为活化剂,通过高温炭化法将宁夏枸杞杆制备成生物质活性炭(CP),并利用乙二酸四乙酸二钠盐(EDTA-2Na)对其进行表面改性,得到氮掺杂活性炭(CPE)。利用比表面积分析(BET)、X射线衍射仪(XRD)、X射线光电子能谱分析仪(XPS)、傅里叶变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)技术手段研究其表面微观形貌和化学结构特性,阐明了EDTA-2Na的改性机理和CPE对亚甲基蓝的吸附机制。结果表明:EDTA-2Na的掺杂可以有效调控生物炭的孔结构和官能团,显著提升了生物炭的比表面积、孔结构和活性吸附位点。EDTA-2Na改性后的生物炭CPE(比表面积(816.47 m^(2)/g)、总孔体积(0.4925 cm^(3)/g)和平均孔径(2.41 nm))参数明显优于CP(比表面积(241.45 m^(2)/g)、总孔体积(0.1280 cm^(3)/g)和平均孔径(2.12 nm))的微观结构,表面形成较稳定的氨基(—NH—、—NH_(2)—)和吡咯结构氮,构成了对亚甲基蓝有较好吸附效果的活性表面生物质碳材料CPE。常温中性条件下,CPE对MB的最大吸附量为658.8 mg/g,较未进行N掺杂的生物碳CP(吸附量为358.2 mg/g)吸附率提升了83.92%。CPE对MB的等温吸附过程符合Langmuir模型(R^(2)=0.9896),吸附动力学符合准二级动力学模型(R2=0.99997),吸附过程主要以单分子层化学吸附为主,循环使用性能较好。

关键词：枸杞杆 H_(3)PO_(4)活化乙二酸四乙酸二钠盐亚甲基蓝吸附

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SiO_(2)@CTS-g-(AA-co-AM)吸水树脂的吸液性能研究

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化学研究与应用 2024年第5期36卷 1084-1091页

作者：张克举夏卿谢雷吴凡申盛伟邓芳徐玉萍刘勇武汉工商学院环境与生物工程学院湖北武汉430065

正硅酸乙酯(TEOS)经碱性催化水解缩合、去模板等工艺合成介孔二氧化硅(SiO_(2)),羧甲基壳聚糖(CTS)作为合成复合吸水树脂的基材,与丙烯酰胺(AM)和丙烯酸(AA)的共聚物接枝共聚,制备了SiO_(2)@CTS-g-(AA-co-AM)复合吸水树脂。傅立叶红外... 详细信息

正硅酸乙酯(TEOS)经碱性催化水解缩合、去模板等工艺合成介孔二氧化硅(SiO_(2)),羧甲基壳聚糖(CTS)作为合成复合吸水树脂的基材,与丙烯酰胺(AM)和丙烯酸(AA)的共聚物接枝共聚,制备了SiO_(2)@CTS-g-(AA-co-AM)复合吸水树脂。傅立叶红外光谱仪、透射电子显微镜和热重分析仪对复合树脂进行了表征,并在不同环境下探讨了吸水树脂的吸液性能及对重金属离子的吸附性能。结果表明,亲水性的SiO_(2)加入,能有效改善吸水树脂耐温保水性能,树脂在80℃条件下干燥6h,其保水率最高可达91.8%。SiO_(2)使得复合树脂形成稳定的三维网络结构,具有较强的耐盐性能,表现出更佳的吸附性能。

关键词：高倍率吸水树脂杂化吸液性能重金属离子

Predictive analytics with ensemble modeling in laparoscopic surgery:A technical note

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Laparoscopic, Endoscopic and Robotic Surgery 2022年第1期5卷 25-34页

作者： Zhongheng zhang Lin Chen ping Xu Yucai Hong Department of Emergency Medicine Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Department of Critical Care Medicine Jinhua Hospital of Zhejiang University School of MedicineJinhua 321000China Emergency Department Zigong Fourth People's HospitalZigong 643000China Institute of Medical Big Data Zigong Academy of Artificial Intelligence and Big Data for Medical Science Artificial IntelligenceZigong 643000China Artificial Intelligence Key Laboratory of Sichuan Province Zigong 643000China

Predictive analytics have been widely used in the literature with respect to laparoscopic surgery and risk ***,most predictive analytics in this field exploit generalized linearmodels for predictive purposes,which are limited by model assumptionsdincluding linearity between response variables and additive interactions between *** many instances,such assumptions may not hold true,and the complex relationship between predictors and response variables is usually *** address this limitation,machine-learning algorithms can be employed to model the underlying *** advantage of machine learning algorithms is that they usually do not require strict assumptions regarding data structure,and they are able to learn complex functional forms using a nonparametric ***,two or more machine learning algorithms can be synthesized to further improve predictive *** a process is referred to as ensemble modeling,and it has been used broadly in various ***,this approach has not been widely reported in the laparoscopic surgical literature due to its complexity in both model training and *** this technical note,we provide a comprehensive overview of the ensemble-modeling technique and a step-by-step tutorial on how to implement ensemble modeling.

关键词： Ensemble modeling Laparoscopic surgery Machine learning

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反应精馏塔制备硅烷多目标优化研究

现代化工 2024年第10期44卷 203-207,213页

作者：李天宇陆平张豪豪蔡卫滨华超陈锦溢中国矿业大学(北京)化学与环境工程学院北京100083 中国科学院过程工程研究所绿色过程与工程重点实验室北京100190

以年总操作费用(TAC)、CO_(2)排放量(GEC)和精馏塔热力学效率(η)为目标,提出了基于粒子群算法(PSO)的优化方法,并将该方法应用于三氯氢硅(SiHCl_(3),TCS)歧化制取硅烷(SiH_(4),MS)反应精馏塔的优化设计。在Aspen Plus V7中建立流程进... 详细信息

以年总操作费用(TAC)、CO_(2)排放量(GEC)和精馏塔热力学效率(η)为目标,提出了基于粒子群算法(PSO)的优化方法,并将该方法应用于三氯氢硅(SiHCl_(3),TCS)歧化制取硅烷(SiH_(4),MS)反应精馏塔的优化设计。在Aspen Plus V7中建立流程进行模拟,使用平衡级模型,对RD-2IC(带有2个中间冷凝器的反应精馏塔)和高压分离塔的双塔构型建立稳态模型,考察了塔压、塔板数、回流比、进料位置、反应段持液量和中间冷凝器气相分率等影响因素,初步确定了各参数的最优值,为进一步深度优化提供了初值和可行域。结果表明,与单因素灵敏度分析结果相比,PSO算法优化后的TAC节省了54.50%、GEC减少了38.13%、η提高了22.55%。

关键词：反应精馏硅烷歧化多目标优化

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Controlling the light wavefront through a scattering medium based on direct digital frequency synthesis technology

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Chinese Physics B 2021年第1期30卷 283-287页

作者： Yuan Yuan Min-Yuan Sun Yong Bi Wei-Nan Gao Shuo zhang Wen-ping zhang Center of Applied Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

Phase modulation is a crucial step when the frequency-based wavefront optimization technique is exploited to measure the optical transmission matrix(TM) of a scattering medium. We report a simple but powerful method, direct digital frequency synthesis(DDS) technology to modulate the phase front of the laser and measure the TM. By judiciously modulating the phase front of a He–Ne laser beam, we experimentally generate a high quality focus at any targeted location through a 2 mm thick 120 grit ground glass diffuser, which is commercially used in laser display and laser holographic display for improving brightness uniformity and reducing speckle. The signal to noise ratio(SNR) of the clear round focus is 50 and the size is about 44 μm. Our study will open up new avenues for enhancing light energy delivery to the optical engine in laser TV to lower the power consumption, phase compensation to reduce the speckle noise, and controlling the lasing threshold in random lasers.

关键词： optical transmission matrix direct digital frequency synthesis technology phase modulation wavefront optimization

Machine-learning-assisted Investigation into the Relationship between the Built Environment,Behavior,and Physical Health of the Elderly in China

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Biomedical and Environmental Sciences 2023年第10期36卷 987-990页

作者： WANG Xiao ping LI Ze Yan zhang Meng LIU Hong Yong School of Civil Engineering and Geomatics Southwest Petroleum UniversityChengdu 610500SichuanChina Jinan University-University of Birmingham Joint Institute Jinan UniversityGuangzhou 511443GuangdongChina School of Civil Engineering Hebei University of EngineeringHandan 056038HebeiChina

Due to an increasing life expectancy and decreasing fertility rate,China officially entered a stage of increased ageing in 2011[1].According to China’s seventh national census,2019,the country’s overall population w... 详细信息

关键词： exceeding learning fertility