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Pyrolytic gas analysis and evaluation from thermal plasma pyrolysis of simulated oil-based drill cuttings

Waste Disposal and Sustainable Energy 2023年第3期5卷 367-382页

作者： Zhuofan Zhai Junhu Zhou Jinlong Wu Jianzhong Liu weijuan yang State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027ZhejiangChina

Oil-based drill cuttings(OBDCs)are hazardous wastes generated during shale gas exploration,and the rapid,efficient and safe disposal methods for OBDCs have attracted the attention of many researchers.Plasma pyrolysis technology is widely used in solid waste treatment due to its extremely high temperature and reaction activity.A laboratory-scale thermal plasma pyrolysis system was built to investigate the plasma pyrolysis mechanism of simulated OBDCs.The thermal decomposition characteristics of OBDCs were studied by thermogravimetric-derivative thermo gravimetric-differential scanning calorimetry(TG-DTG-DSC)analysis in the range of 50–1300℃.The thermal decomposition process of OBDCs was divided into the following four stages:evaporation of water and light oil,evaporation and decomposition of heavy oil,carbonate decomposition,and phase change reaction from solid to liquid.The effects of the oil ratio,water content,and water/oil(W/O)ratio of OBDCs on the composition and gas selectivity of pyrolytic gas were investigated.The results show that thermal plasma can crack the mineral oil in the OBDCs into clean gases such as H_(2),CO and C_(2)H_(2),while water can promote the decomposition of the heavy oil molecules and enhance the H_(2)production.The energy consumption model calculation for the pyrolysis and melting of OBDCs shows that the highest energy utilization and the lowest molar energy consumption of H_(2)were achieved at a W/O ratio of 1:4.Based on the thermal plasma pyrolysis system used in this study,the commercial application prospects and economic benefits of the plasma pyrolysis of OBDCs were discussed.

关键词： Oil-based drill cuttings Plasma Pyrolysis Hydrogen Energy consumption

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Effect of particle size and oxygen content on ignition and combustion of aluminum particles

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Chinese Journal of Aeronautics 2017年第6期30卷 1835-1843页

作者： Yu'nan ZHOU Jianzhong LIU Daolun LIANG Wei SHI weijuan yang Junhu ZHOU State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

Particle size and oxygen content are two of the key factors that affect the ignition and combustion properties of aluminum particles. In this study, a laser ignition experimental system and flame test system were built to analyze the ignition and combustion characteristics and the flame morphology of aluminum particles. A thermobalance system was used to analyze the thermal oxidation characteristics. In addition, the microstructure of aluminum was analyzed by scanning electron microscopy. It was found that the oxidized products were some of the gas phase products agglomerated. Smaller particle size samples showed better combustion characteristics. The combustion intensity, self-sustaining combustion time and the burn-off rate showed a rising trend with the decrease in the particle size. Increasing the oxygen content in the atmosphere could improve the ignition and combustion characteristics of the samples. Four distinct stages were observed in the process of ignition and combustion. Small particle size samples had a larger flame height and luminance, and the self-sustaining combustion time was much longer.Three distinct stages were observed during the thermal oxidation process. The degree of oxidation for small-sized samples was significantly higher than that for the larger particle size samples.Moreover, it was observed that the higher the oxygen content, the higher the degree of oxidation was.

关键词： Aluminum Flame Ignition and combustion Laser Thermal analysis

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Characterization of wet microalgal cells pretreated with steam for lipid extraction

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Chinese Journal of Chemical Engineering 2021年第9期34卷 114-120页

作者： Wenlu Song Rui Huang Hao Guo Chunguang Yin Chuanling Wang Jun Cheng weijuan yang Department of Life Science and Engineering Jining UniversityJining 273155China The Electrical Engineering College Guizhou UniversityGuiyang 550025China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China ShanDong Fanpu Analytic Co. LtdJining 272000China

Steam pretreatment was employed to disrupt Microalgal cells for lipids extraction.Effects of steam pretreatment on microstructure of microalgal cells were investigated through scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Effect of treatment on lipid extraction was also studied.Microalgal cell walls were distorted after steam pretreatment due to the hydrolysis of organic macromolecules contained in cell wall.Maximum curvature was increased from 1.88×10^(-6) m^(-1) to 1.43×10^(-7) m^(-1) after treatment with the steam at 130℃.The fractal dimension of microalgal cells increased from 1.25 to 1.30 after pretreatment for 15 min,and further increased to 1.47 when the pretreatment time was increased to 60 min.Increased steam pretreatment temperature and time enhanced the hydrolysis of organic macromolecules,and finally destroyed microalgal cell walls at pretreatment temperature of 130℃and pretreatment time of 60 min.Lipid extracted from wet microalgal was significantly increased(2.1-fold)after pretreatment.

关键词： Chlorella pyrenoidosa Steam pretreatment Cell wall disruption Lipids extraction

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气体入口流量低频脉冲对燃烧稳定性的影响

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热科学与技术 2024年第1期23卷 53-60页

作者：徐智康高瞻杨卫娟徐佳琦刘建忠浙江大学能源工程学院能源清洁利用国家重点实验室浙江杭州310027

外部运行因素变化会导致不稳定燃烧现象的发生,严重时甚至引发燃烧室结构损毁。在甲烷与空气当量比为1条件下以非预混燃烧火焰为对象,利用动态压力传感器及光栅光谱仪测量压力与热释放率的变化,通过实验研究气体入口流量低频脉冲(1.000~... 详细信息

外部运行因素变化会导致不稳定燃烧现象的发生,严重时甚至引发燃烧室结构损毁。在甲烷与空气当量比为1条件下以非预混燃烧火焰为对象,利用动态压力传感器及光栅光谱仪测量压力与热释放率的变化,通过实验研究气体入口流量低频脉冲(1.000~5.000 Hz)对燃烧稳定性的影响。结果表明入口流量脉冲影响燃烧的稳定性,其中火焰形态、燃烧室压力(p)和热释放率(qi)等会发生同频周期脉动。脉冲频率在2.000~2.500 Hz时对削弱燃烧稳定性影响最大,表现为p和qi出现高的脉动幅值,而1.000 Hz脉冲频率对削弱燃烧稳定性影响最小;脉冲频率对削弱燃烧稳定性的影响随频率增加逐渐从线性向非线性变化。脉冲流量越大,p和qi的脉动幅值越大,燃烧越趋向不稳定燃烧。

关键词：气体射流脉冲流量非预混燃烧时频特性燃烧稳定性

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循证护理结合根因分析在卒中后吞咽障碍患者中的应用效果

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临床医学研究与实践 2024年第17期9卷 141-144页

作者：原丹丹周彦芝寇毅陈菊梅杨伟娟陶天歌西安市中心医院神经内科陕西西安710003 西安医学院临床医学院陕西西安710021

目的分析循证护理结合根因分析在卒中后吞咽障碍患者中的应用效果。方法选取2020年6月至2021年12月接受康复治疗的100例卒中后吞咽障碍患者为研究对象,按照随机数字表法将其分为对照组和研究组,各50例。对照组实施常规护理干预,研究组... 详细信息

目的分析循证护理结合根因分析在卒中后吞咽障碍患者中的应用效果。方法选取2020年6月至2021年12月接受康复治疗的100例卒中后吞咽障碍患者为研究对象,按照随机数字表法将其分为对照组和研究组,各50例。对照组实施常规护理干预,研究组在对照组基础上实施循证护理结合根因分析干预。比较两组的干预效果。结果干预后,研究组的自我护理能力量表(ESCA)各维度评分高于对照组(P<0.05)。干预后,研究组的洼田饮水试验(WST)、标准吞咽功能评定量表(SSA)评分低于对照组(P<0.05)。干预后,研究组的Barthel指数、吞咽障碍特异性生存质量量表(SWAL-QOL)评分高于对照组(P<0.05)。干预后,研究组的总蛋白(TP)、血红蛋白(HB)及白蛋白(ALB)水平高于对照组(P<0.05)。研究组的护理总有效率高于对照组(P<0.05)。结论循证护理结合根因分析用于卒中后吞咽障碍患者康复过程中的效果理想,可有效改善患者的吞咽功能及机体营养状况,提升其自护能力、日常生活能力及生活质量。

关键词：循证护理根因分析卒中吞咽障碍

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Seismic-induced surficial failure of cohesive slopes using three-dimensional limit analysis:A case study of the Wangjiayan landslide in Beichuan, China

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 537-545页

作者： Gao Yufeng Liu yang Geng weijuan Zhang Fei Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering College of Civil and Transportation EngineeringHohai UniversityNanjing 210098China Department of Civil Engineering Faculty of Civil Engineering and MechanicsJiangsu UniversityZhenjiang 212013China

A seismic-induced landslide is a common geological catastrophe that occurs in nature.The Wangjiayan landslide,which was triggered by the Wenchuan earthquake,is a typical case in point.The Wanjiayan landslide caused many casualties and resulted in enormous property loss.This study constructs a simple surficial failure model based on the upper bound approach of three-dimensional(3D)limit analysis to evaluate the slope stability of the Wangjiayan case,while a traditional two-dimensional(2D)analysis is also conducted as a reference for comparison with the results of the 3D analysis.A quasi-static calculation is used to study the effect of the earthquake in terms of horizontal ground acceleration,while a parametric study is conducted to evaluate the critical cohesion of slopes.Rather than employing a 3D analysis,using the 2D analysis yields an underestimation regarding the safety factor.In the Wangjiayan landslide,the difference in the factors of safety between the 3D and 2D analyses can reach 20%.The sliding surface morphology as determined by the 3D method is similar to actual morphology,and the parameters of both are also compared to analyze the reliability of the proposed 3D method.

关键词： landslide Wenchuan earthquake surficial failure limit analysis stability quasi-static

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Maps Preserving Semi-Fredholm Operators with Fixed Nullity

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Journal of Mathematical Research with Applications 2024年第4期 533-540页

作者： Mengran NI weijuan SHI Department of Mathematics Shaanxi Normal University

Let X be an infinite-dimensional complex Banach space, and B(X) the algebra of all bounded linear operators on X. Given an integer n ≥ 1, we characterize all the bijective maps on B(X) preserving the difference of semi-Fredholm operators with nullity equal to n in both directions, and establish the structure of the given maps.

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Sanhua Tang(三化汤) protects against ischemic stroke by preventing blood-brain barrier injury: a network pharmacology and in vivo experiments

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Journal of Traditional Chinese Medicine 2024年第4期 794-803页

作者： LUO Shan yang Fan CHEN Yuanchun ZHAO Ruoxi LIU Haiye GAO Fei MA Wencan GAO weijuan YU Wentao College of Basic Medicine Hebei University of Chinese Medicine Graduate School Hebei University of Chinese Medicine College of Acupuncture and Massage Hebei University of Chinese Medicine Hebei Key Laboratory of Chinese Medicine Research on Cardio-Cerebrovascular Diseases Hebei International Joint Research Centre for Acupuncture and Moxibustion of Traditional Chinese Medicine

OBJECTIVE: To assess the effect and mechanism of Sanhua Tang(三化汤, SHT) in treating ischemic stroke(IS) through the "Kaitong Xuanfu" theory by using network pharmacology and animal experiments. METHODS: The active ingredients and targets of SHT and IS were screened by public databases such as Traditional Chinese Medicine systems pharmacology, GeneCards, and online mendelian inheritance in man. Visual network topographies were constructed using R, Cytoscape 3.6.0, AutoDockTools, a user-sponsored molecular visualization system on an open-source foundation, and other software to analyze the correlation between targets and active ingredients. The middle cerebral artery occlusion(MCAO) model was established by operation. Animals were divided into the Sham group, MCAO group(M group), aloe-emodin(AE) group(MCAO rats treated with aloe-emodin), SHT at low dosage(SL group)(MCAO rats treated with SL), SHT at medium dosage(SM group), and SHT at high dosage(SH group). 2,3,5-triphenyl tetrazolium chloride staining was used to detect the volume of cerebral infarction; Nissl staining was used to observe the morphology of neuronal cells; transmission electron microscopy was used to observe the integrity of the blood-brain barrier(BBB); enzymelinked immunosorbent assay was used to detect the content of interleukin-6(IL-6), IL-10, tumor necrosis factor α(TNF-α) in serum. Western blot was used to detect the expression of vascular endothelial growth factor A(VEGFA) protein in the cerebral ischemic penumbra. RESULTS: Using network pharmacology and molecular docking validation, four active ingredients(lignan, naringenin, aloe-rhodopsin, and β-sitosterol), seven target proteins(protein kinase b 1, IL-6, TNF, VEGFA, TP53, jun proto-oncogene, and cysteinyl aspartate specific proteinase 3), and inflammatory signaling pathways were identified. Animal experiments showed that the SH and AE groups had fewer neurological deficits, reduced brain infarct volumes, decreased serum inflammatory factor levels, increased expression of VEGFA protein, an

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青藏高原东北缘基于W2度量的全波形成像

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地球物理学报 2024年第3期67卷 843-854页

作者：董兴朋杨顶辉蒙伟娟中国地震局地质研究所北京100029 清华大学数学科学系北京100084

本研究收集青藏高原东北缘区域114个宽频带地震台站记录到的50个区域地震事件波形数据,采用基于二次Wasserstein(W2)度量的全波形成像方法,获得了10~100 s频带下该区域的高分辨率壳幔结构图像.结果显示,秦岭造山带中下地壳呈高速特征,... 详细信息

本研究收集青藏高原东北缘区域114个宽频带地震台站记录到的50个区域地震事件波形数据,采用基于二次Wasserstein(W2)度量的全波形成像方法,获得了10~100 s频带下该区域的高分辨率壳幔结构图像.结果显示,秦岭造山带中下地壳呈高速特征,表明高原内部弱物质未流入此处;而从松潘—甘孜地块跨过昆仑断裂至秦祁地块内的中下地壳呈现低S波速、正径向各向异性(V_(SH)>V_(SV))和高泊松比异常,暗示深部地壳物质存在水平流动.在秦祁地块中部,深部地壳高速特性及负径向各向异性(V_(SH)

关键词：青藏高原东北缘 Wasserstein度量波形反演地壳流径向各向异性泊松比

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Haplotype-based phylogenetic analysis and population genomics uncover the origin and domestication of sweetpotato

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Molecular Plant 2024年第2期17卷 277-296页

作者： Mengxiao Yan Ming Li Yunze Wang Xinyi Wang M-Hossein Moeinzadeh Dora G.Quispe-Huamanquispe weijuan Fan Yijie Fang Yuqin Wang Haozhen Nie Zhangying Wang Aiko Tanaka Bettina Heider Jan F.Kreuze Godelieve Gheysen Hongxia Wang Martin Vingron Ralph Bock Jun yang Shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical GardenShanghai 201602China College of Life Sciences Chongqing Normal UniversityChongqing 401331China Biotechnology and Nuclear Technology Research Institute Sichuan Academy of Agricultural SciencesChengdu 610061China College of Life Sciences Shanghai Normal UniversityShanghai 200234China Department of Computational Molecular Biology Max Planck Institute for Molecular GeneticsIhnestraBe 63-7314195 BerlinGermany Department of Biotechnology Ghent University9000 GhentBelgium Guangdong Provincial Key Laboratory of Crops Genetics and Improvement Crop Research InstituteGuangdong Academy of Agricultural SciencesGuangzhou 510640China Graduate School of Bioagricultural Sciences Nagoya UniversityChikusaNagoya 464-8601Japan international Potato Center(CIP) LimaPeru CAS Center for Excellence of Molecular Plant Sciences Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200233China Max-Planck-Institut fur Molekulare Pflanzenphysiologie Am Muhlenberg 114476 Potsdam-GolmGermany

The hexaploid sweetpotato(lpomoea batatas)is one of the most important root crops worldwide.However,its genetic origin remains controversial,and its domestication history remains unknown.In this study,we used a range of genetic evidence and a newly developed haplotype-based phylogenetic analysis to identify two probable progenitors of sweetpotato.The diploid progenitor was likely closely related to lpomoea ae-quatoriensis and contributed the B,subgenome,IbT-DNA2,and the lineage 1 type of chloroplast genome to sweetpotato.The tetraploid progenitor of sweetpotato was most likely l.batatas 4x,which donated the B2 subgenome,IbT-DNA1,and the lineage 2 type of chloroplast genome.Sweetpotato most likely originated from reciprocal crosses between the diploid and tetraploid progenitors,followed by a subsequent whole-genome duplication.In addition,we detected biased gene exchanges between the subgenomes;the rate of B,to B2 subgenome conversions was nearly three times higher than that of B2 to B subgenome conver-sions.Our analyses revealed that genes involved in storage root formation,maintenance of genome stabil-ity,biotic resistance,sugar transport,and potassium uptake were selected during the speciation and domestication of sweetpotato.This study sheds light on the evolution of sweetpotato and paves the way forimprovementofthiscrop.

关键词： sweetpotato origin gene conversion domestication IbT-DNA HPA

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