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Converting furfural residue wastes to carbon materials for high performance supercapacitor

Green Energy & Environment 2022年第6期7卷 1270-1280页

作者： Xiaoying Guo xusheng zhang Yingxiong Wang Xiaodong Tian Yan Qiao State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China Shanxi Engineering Research Center of Biorefinery Institute of Coal ChemistryChinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China

Sustainable development based on the value-added utilization of furfural residues(FRs)is an effective way to achieve a profitable circular *** comprehensive work highlights the potential of FRs as precursor to prepare porous carbons for high performance supercapacitors(SCs).To improve the electrochemical performance of FR-based carbon materials,a facile route based on methanol pretreatment coupled with pre-carbonization and followed KOH activation is *** defects could be obtained after methanol treatment,which is incline to optimize textural *** activated methanol treated FR-based carbon materials(AFRMs)possess high specific surface area(1753.5 m^(2) g^(-1)),large pore volume(0.85 cm^(3) g^(-1)),interconnected micro/mesoporous structure,which endow the AFRMs with good electrochemical performance in half-cell(326.1 F g^(-1) at 0.1 Ag^(-1),189.4 Fg^(-1) at 50 A g^(-1) in 6 mol L^(-1) KOH).The constructed symmetric SCs based on KOH,KOH–K_(3)Fe(CN)_(6) and KOH-KI electrolyte deliver energy density up to 8.9,9.9 and 10.6 Wh kg^(-1) with a capacitance retention of over 86%after 10,000 ***,the self-discharge can be restrained by the addition of K_(3)Fe(CN)_(6) and KI in KOH *** study provides an effective approach for high-valued utilization of FR waste.

关键词： Furfural residue Methanol Porous carbon materials Electrolyte additives Supercapacitor

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Six Subfamilies of Implementation-Friendly Barreto-Naehrig Curves

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Chinese Journal of Electronics 2014年第1期23卷 169-174页

作者： CHEN Shan zhang xusheng WANG Kunpeng LIN Dongdai State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Institute of Software Chinese Academy of Sciences

In this paper, we depict in detail six subfamilies of implementation-friendly Barreto-Naehrig(BN)elliptic curves by choosing six special congruency classes of the curve-finding search parameter. These curves have small curve constants, support efficient tower extension options of finite field required in fast pairing implementation and have obvious generators for the bilinear cycle group G1. The detailed description will supply the implementor with more choices of suitable BN curves.

关键词： Pairing-based cryptography Pairingfriendly elliptic curves BN elliptic curves Tower extension Sextic twist

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Protective effect of retaining wall on rock avalanche:A case study of Nayong rock avalanche in China

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Journal of Mountain Science 2024年第4期21卷 1215-1230页

作者： WANG Zhongfu SHI Fengge HE Siming zhang xusheng WANG Jingying LIU Enlong North China University of Water Resources and Electric Power Zhengzhou 450046China Hunan Provincial key Laboratory of key Technology on Hydropower Development Changsha 410014China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China

Rock avalanches are generally difficult to prevent and control due to their high velocities and the extensive destruction they ***,barrier structures constructed along the path of a rock avalanche can partially mitigate the magnitudes and consequences of such catastrophic *** selected a rock avalanche in Nayong County,Guizhou Province,China as a case to study the effect of the location and height of a retaining wall on the dynamic characteristics of rock avalanche by using both actual terrain-based laboratory-model tests and coupled PFC3D-FLAC3D numerical *** findings demonstrate that a retaining wall can largely block a rock avalanche and its protective efficacy is significantly influenced by the integrity of the retaining *** numerical simulation can serve as a powerful tool for analyzing the interaction between a rock avalanche and a retaining wall,facilitating precise observations of its deformation and *** impact-curve characteristics of the retaining wall depend upon whether or not the rock avalanche-induced destruction is taken into *** location of the retaining wall exerts a greater influence on the outcome compared to the height and materials of the retaining wall,while implementing a stepped retaining-wall pattern in accordance with the terrain demonstrates optimal efficacy in controlling rock avalanche.

关键词： Rock avalanche Laboratory model test Retaining wall PFC^(3D) FLAC^(3D) Impact force

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Thermal and elemental analysis of the combustion chamber deposits in a large-scale two-stroke marine diesel engine

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Science China(Technological Sciences) 2015年第10期58卷 1717-1725页

作者： zhang xusheng ZENG XiangMing SUN XiuCheng DENG Biao PENG GuanYun XIE HongLan WU ZhiJun XIAO TiQiao Merchant Marine College Shanghai Maritime University Shanghai Institute of Applied Physics Chinese Academy of Sciences School of Automotive Studies Tongji University

It is of significance to understand the chemical content of carbon deposits in the large-scale two-stroke(LSTS) marine diesel engine because of adverse effect on the engine performance, oil consumption and emissions. In this work, two different combustion chamber deposits in an LSTS marine diesel engine were studied using thermogravimetry analysis(TGA), elemental analysis(EA) and synchrotron X-ray fluorescence(SXRF). One was on the piston top and the other on the piston land, termed PTCD and PLCD, respectively. For the PTCD sample, the 97% residue in the TGA and 1.4% carbon content in the EA indicated the main compositions of PTCD were metal salts or oxides and ashes, significantly different from the previous findings of the highest carbon content in deposits from the small four stroke engines. The different chemical content between PTCD and PLCD implied higher thermal load in the LSTS marine diesel engine led to a nearly complete thermal decomposition of PTCD. The higher calcium content in PTCD and PLCD indicated the additives of cylinder oil should be the main source of metal content of PTCD and PLCD. Calcium distribution in the SXRF results was indicative of the potential layered structure in PTCD and PLCD. In addition, the appearance of iron on the surface against the piston in PTCD and PLCD indicated iron oxides formation between carbon deposit and piston materials.

关键词： combustion chamber deposits thermogravimetry analysis elemental analysis marine diesel engine synchrotron X-rayfluorescence spectrometry

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Effect of biodiesel on the particle size distribution in the exhaust of common-rail diesel engine and the mechanism of nanoparticle formation

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Science China(Technological Sciences) 2009年第9期52卷 2773-2778页

作者： zhang xusheng ZHAO Hui HU ZongJie WU ZhiJun LI LiGuang School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Automotive Studies Tongji UniversityShanghai 200092China

Effect of biodiesel blends on the particle size distribution (PSD) of exhaust aerosol and the mechanism of nanoparticle formation were investigated with a modern common rail light-duty diesel engine. The results showed that PSD of diesel included two modes:nucleation mode (NM) and accumulation mode (CM). The criterion diameter of the two modes is 50 nm. Only CM was observed for all fuels under the condition of 50 N.m,2000 r/min. When the engine torque was higher than 150 N.m,log-modal PSD of diesel shifted to bimodal. At higher loads,if the biodiesel blend ratio was below 60%,the PSD of biodiesel blends still included the two modes. However,no NM particles were found for pure biodiesel. At lower loads,only CM was found in PSD of all fuels. Significant reduction of CM particles was found for biodiesel blends compared with diesel. Discussion on the mechanism of nanoparticle formation indicated that for the light-duty diesel engine with oxidation catalysts,fuel consumption and exhaust temperature increased with increasing the engine loads,and SO2 was converted to SO3 by catalyst which,in its hydrated form,could act as the precursor for biodiesel NM formation. Therefore,sulfur level of biodiesel blends dominates the nanoparticle formation in light-duty diesel engine with oxidation catalysts.

关键词： biodiesel particle size distribution nanoparticle common rail

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Transcriptome and Metabolome Analyses of Sea Cucumbers Apostichopus japonicus in Southern China During the Summer Aestivation Period

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Journal of Ocean University of China 2021年第1期20卷 198-212页

作者： YANG Qiuhua zhang xusheng LU Zhen HUANG Ruifang TRAN Ngoc Tuan WU Jianshao YANG Fuyuan GE Hui ZHONG Chenhui SUN Qian ZHOU Chen LIN Qi Key Laboratory of Cultivation and High-Value Utilization of Marine Organisms in Fujian Province Fisheries Research Institute of FujianXiamen 361013China Guangdong Provincial Key Laboratory of Marine Biology Marine Biology InstituteShantou UniversityShantou 515063China

Aestivation is a common strategy of sea cucumbers(Apostichopus japonicus)in response to high-temperature *** studies have individually investigated the immune and physiological alterations at the aestivation ***,these studies have not evaluated the relationship between immunity and *** this study,we explored the transcriptome and metabolome of *** during the aestivation stage to study the *** transcriptome analysis of dormant(aestivation)and revived *** generated 2368 differentially expressed genes,including 927 downregulated genes and 1441 upregulated *** on Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analyses,the downregulated genes in the dormant group were found to be involved in DNA replication,RNA metabolic process,and protein metabolism,which results in the inhibition of motility,skeletal development,neural activity,cell proliferation,and development of *** contrast,the upregulated genes were found to be associated with fatty acid metabolism,carbohydrate hydrolysis,and *** the metabolome analysis,the downregulated metabolites were found to be associated with fatty acid metabolism,starch and sucrose metabolism,and TCA *** indicates that dormant sea cucumbers consume reserved carbohydrates and fatty acids to maintain low levels of energy *** protein-protein interaction network analysis further revealed that carbohydrate hydrolysis promoted phagocytosis activity in the dormant *** study provides new insights into potential molecular mechanisms of sea cucumber survival in high-temperature conditions,which is critical in aquaculture of sea cucumbers.

关键词： aestivation Apostichopus japonicus hypometabolism fatty acid metabolism carbohydrate hydrolysis phagocytosis

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线性离散成像系统调制传递函数的随机条纹测试法

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光学学报 2005年第7期25卷 918-922页

作者：张旭升沙定国北京理工大学信息科学技术学院光电工程系北京100081

离散光电成像系统因其不再具有平移不变特性,它的调制传递函数测试具有相当的复杂性和不稳定性。为提高光学系统调制传递函数测试的灵活性和可重复性,在基于统计光学和随机信号相关性理论的基础上,分析了离散型空间随机信号经线性光学... 详细信息

离散光电成像系统因其不再具有平移不变特性,它的调制传递函数测试具有相当的复杂性和不稳定性。为提高光学系统调制传递函数测试的灵活性和可重复性,在基于统计光学和随机信号相关性理论的基础上,分析了离散型空间随机信号经线性光学系统成像后的物像相关性,提出了应用随机条纹靶来测定调制传递函数的方法,并给出了计算数据结果。该方法从统计意义上考虑了离散采样成像器件的采样场景相位的影响,大大提高了现场测试的灵活性和自动化程度,具有很好的应用前景。此方法同样适用于一般光学成像系统的调制传递函数测量。

关键词：光学测量调制传递函数离散型空间随机信号相关函数随机条纹靶

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北祁连埃迪卡拉纪菱铁矿铁建造成因及其对海洋环境的约束

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科学通报 2021年第23期66卷 3032-3044页

作者：杨秀清张旭升长安大学地球科学与资源学院教育部西部矿产资源与地质工程重点实验室西安710054

新元古代铁建造(iron formations,IF)主要形成于成冰纪(约717~635 Ma),而埃迪卡拉纪(635~541 Ma)IF比较少见,且该时期海洋环境争议很大.北祁连塔里干沟铁矿(IF)呈层状、似层状产出于约600 Ma陆源碎屑沉积建造之中,IF呈块状和浸染状构造... 详细信息

新元古代铁建造(iron formations,IF)主要形成于成冰纪(约717~635 Ma),而埃迪卡拉纪(635~541 Ma)IF比较少见,且该时期海洋环境争议很大.北祁连塔里干沟铁矿(IF)呈层状、似层状产出于约600 Ma陆源碎屑沉积建造之中,IF呈块状和浸染状构造,半自形-它形结构,主要以菱铁矿为主,可见少量燧石/石英、重晶石、硫化物和碳酸盐矿物等,变质程度较浅,局部可见铜矿化.菱铁矿可见少量Mg替代,重晶石含有少量Sr.塔里干沟IF TFe_(2)O_(3)含量很高,其次为SiO_(2)和Mg O,Al_(2)O_(3)、Ti O_(2)、高场强元素和稀土元素含量很低,表明其为纯净的化学沉积岩.IF可见较高的Fe/Ti、Fe/Al比值和SiO_(2)/Al_(2)O_(3)比值,稀土元素经太古宙后平均澳大利亚页岩(PAAS)标准化后,呈现轻稀土显著亏损,重稀土相对富集的特征(PrPAAS/YbPAAS=0.16~0.70),可见Eu正异常(Eu/Eu^(*)=1.17~1.66),菱铁矿碳同位素变化范围为-2.6‰~0.1‰,暗示铁来源于海底热液和海水,碳来自海水中溶解的无机碳,菱铁矿为原始无机沉淀成因.部分IF样品MnO含量相对较高(>1.00wt%),并显示Ce正异常,较低的Y/Ho比值,与古元古代晚期IF非常相似,暗示埃迪卡拉纪出现氧化还原分层海洋,海水表层氧化,深部缺氧、富铁,局部可能形成"硫化楔",IF形成于深部缺氧、富铁水体,与前人通过地球化学指标(例如铁组分和硫同位素等)推测的埃迪卡拉纪海洋氧化还原状态和化学组成一致.

关键词：铁建造埃迪卡拉纪缺氧、富铁海洋菱铁矿北祁连

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平板玻璃中部应力的偏振移相检测法

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光学学报 2018年第4期38卷 312-316页

作者：张伟朱秋东张旭升北京理工大学精密光电测试仪器及技术北京市重点实验室北京100081

基于平面偏振干涉测量原理,提出了一种用于平板玻璃中部应力检测的偏振移相干涉测量法。通过旋转检偏器实现了偏振移相,采用建立的数学模型得到了应力双折射数值及其分布曲线,由玻璃的应力光学系数得到了中部应力值。对浮法平板玻璃样... 详细信息

基于平面偏振干涉测量原理,提出了一种用于平板玻璃中部应力检测的偏振移相干涉测量法。通过旋转检偏器实现了偏振移相,采用建立的数学模型得到了应力双折射数值及其分布曲线,由玻璃的应力光学系数得到了中部应力值。对浮法平板玻璃样品的中部应力进行了实验研究,结果表明,所提方法的测量误差可控制在3%以内,测量重复性优于1nm/cm,验证了所提方法的可行性。

关键词：物理光学偏振光学平板玻璃中部应力双折射

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基于DC/DC变换器的电池组主动双向均衡技术研究

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电测与仪表 2017年第16期54卷 117-122页

作者：张旭升许继集团有限公司河南许昌461000

电池组均衡技术是电池管理系统的核心技术之一。文章介绍了几种电池组均衡技术,对其优缺点进行了比较和分析,在此基础上提出了一种电池组主动双向均衡方案。该均衡系统由电池组、开关阵列、双向DC/DC变换器、数据采集单元和控制单元组... 详细信息

电池组均衡技术是电池管理系统的核心技术之一。文章介绍了几种电池组均衡技术,对其优缺点进行了比较和分析,在此基础上提出了一种电池组主动双向均衡方案。该均衡系统由电池组、开关阵列、双向DC/DC变换器、数据采集单元和控制单元组成。给出了开关阵列和双向DC/DC变换器的电路拓扑结构,详细阐述了其工作原理和控制方法,介绍了主要电路参数的设计方法,并通过MATLAB/Simulink仿真实验进一步验证了该方案的可行性。

关键词：主动双向均衡开关阵列双向DC/DC变化器仿真实验

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