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The Estimation of the Higher Heating Value of Biochar by Data-Driven Modeling

Journal of Renewable Materials 2022年第6期10卷 1555-1574页

作者： Jiefeng Chen Lisha Ding Pengyu Wang weijin Zhang Jie Li Badr A.Mohamed Jie Chen Songqi Leng Tonggui Liu Lijian Leng Wenguang Zhou Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education and School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchangChina School of Energy Science and Engineering Central South UniversityChangshaChina Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore Department of Agricultural Engineering Cairo UniversityGizaEgypt

Biomass is a carbon-neutral renewable energy *** produced from biomass pyrolysis exhibits preferable characteristics and potential for fossil fuel *** time-and cost-saving,it is vital to establish predictive models to predict biochar ***,limited studies focused on the accurate prediction of HHV of biochar by using proximate and ultimate analysis results of various ***,the multi-linear regression(MLR)and the machine learning(ML)models were developed to predict the measured HHV of biochar from the experiment data of this *** detail,52 types of biochars were produced by pyrolysis from rice straw,pig manure,soybean straw,wood sawdust,sewage sludge,Chlorella Vulgaris,and their mixtures at the temperature ranging from 300 to 800℃.The results showed that the co-pyrolysis of the mixed biomass provided an alternative method to increase the yield of biochar *** contents of ash,fixed carbon(FC),and C increased as the incremental pyrolysis temperature for most *** Pearson correlation(r)and relative importance analysis between HHV values and the indicators derived from the proximate and ultimate analysis were carried out,and the measured HHV was used to train and test the MLR and the ML ***,ML algorithms,including gradient boosted regression,random forest,and support vector machine,were also employed to develop more widely applicable models for predicting HHV of biochar from an expanded dataset(total 149 data points,including 97 data collected from the published literature).Results showed HHV had strong correlations(|r|>0.9,p*** ML models showed better performance with test R^(2)around 0.95(random forest)and 0.97–0.98 before and after adding extra data for model construction,*** importance analysis of the ML models showed th

关键词： Biochar higher heating value machine learning prediction proximate analysis ultimate analysis

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Cellular tropism and antigenicity of mink-derived SARS-CoV-2 variants

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Signal Transduction and Targeted Therapy 2021年第6期6卷 1668-1670页

作者： Li Zhang Qianqian Li Jianhui Nie Ruxia Ding Haixin Wang Jiajing Wu xuguang Li Xiaoming Yang weijin Huang Youchun Wang Division of HIV/AIDS and Sex-transmitted Virus Vaccines Institute for Biological Product ControlNational Institutes for Food and Drug Control(NIFDC)and WHO Collaborating Center for Standardization and Evaluation of BiologicalsBeijingChina Centre for Biologies Evaluation Biologic and Radiopharmaceutical Drugs DirectorateHPFBHealth CanadaOttawaONCanada China National Biotec Group Company Limited BeijingChina

Dear Editor,The outbreak of SARS-CoV-2 in minks has been observed recently,raising serious concerns over cross-species transmission and the emergence of variants capable of rendering antibody therapy and vaccines less ***,the species tropism and antigenicity of the spike protein of ten variants were analyzed in pseudovirus-based assays involving 25 cell lines as well as 293T cells expressing ACE2 receptor from 14 species.

关键词： ACE2 mink variants

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饮用水中的微塑料及其拉曼光谱检测技术研究进展

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激光生物学报 2024年第1期33卷 14-23页

作者：崔胜东李永增彭伟金柯城张先增王敏黄正福建师范大学光电与信息工程学院医学光电科学与技术教育部重点实验室福建省光子技术重点实验室福州350007

塑料的发明和应用已逾百年,给日常生活带来了极大的便利。塑料制品及成分经过破碎降解后形成微塑料(MPs),环境中的MPs可进入饮用水,其污染和潜在的健康危害逐渐受到重视。MPs的定性和定量检测仍处于发展阶段,拉曼光谱(RS)是目前较常用... 详细信息

塑料的发明和应用已逾百年,给日常生活带来了极大的便利。塑料制品及成分经过破碎降解后形成微塑料(MPs),环境中的MPs可进入饮用水,其污染和潜在的健康危害逐渐受到重视。MPs的定性和定量检测仍处于发展阶段,拉曼光谱(RS)是目前较常用的一种较灵敏的非破坏性的无损光学分析技术。本文重点介绍了饮用水中MPs的来源、潜在危害以及RS检测的研究进展,旨在提高对饮用水中MPs污染的认知和对研发MPs检测技术的重视。

关键词：微塑料饮用水危害拉曼光谱检测

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广西贵金属矿产资源特征、成矿规律与找矿方向

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中国矿业 2024年第8期33卷 225-237页

作者：黎华黄凡周伟金廖智涵刘名朝韦安伟戴昱孙兴庭陈文伦尤俊杰蒋剑辛晓卫广西壮族自治区地质调查院广西南宁530023 中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037 广西壮族自治区区域地质调查院广西桂林541003

广西贵金属矿产以金、银和铂为主,资源较为丰富,共发现金矿产地283处,累计查明资源量621.01539 t;银矿产地184处,累计查明资源量23347.64 t;伴生铂矿产地1处。矿床类型复杂多样,独立金矿以浅成中-低温热液型为主,岩浆热液型和陆相火山... 详细信息

广西贵金属矿产以金、银和铂为主,资源较为丰富,共发现金矿产地283处,累计查明资源量621.01539 t;银矿产地184处,累计查明资源量23347.64 t;伴生铂矿产地1处。矿床类型复杂多样,独立金矿以浅成中-低温热液型为主,岩浆热液型和陆相火山岩型次之;银矿以共伴生矿床为主,常与铅锌金同体共伴生;铂矿以微细粒浸染型金伴生铂为主。成矿时代上,金银矿既有成矿期次多、时间跨度长的特点,又有集中爆发成矿的特征,均以燕山期最为主,形成了广西主要的大、中型金银矿床。空间分布上,金银矿以地域性集中分布为特征,且明显受构造和岩浆岩控制,常沿区域性断裂/褶皱成群、成带分布或沿岩体与围岩的内外接触带分布,寒武系和三叠系是主要的赋矿层位。通过对广西贵金属区域成矿地质条件和资源潜力分析,圈定了成矿远景区,其中,金矿划分出13个成矿远景区,银矿划分出8个成矿远景区,预测资源量分别为1033 t和77655 t,表明金银矿仍有较大的找矿潜力。广西具有铂高背景值,成矿条件良好,应注意基性-超基性岩的评价,以及微细粒浸染型金矿种伴生铂的评价,同时也要注意新类型铂矿的查找,如与黑色岩系有关的铂矿床。

关键词：贵金属矿产矿床类型成矿规律潜力评价找矿方向广西

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基于Kalman滤波和边缘直方图的实时目标跟踪

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清华大学学报（自然科学版） 2008年第7期48卷 1104-1107页

作者：刘惟锦章毓晋清华大学电子工程系北京100084

为提高光照变化和背景混淆下的实时跟踪效果,提出了基于Kalman滤波和边缘直方图特征(edge orientationhistogram,EOH)的实时目标跟踪方法。边缘方向直方图对光照变化不敏感,且对颜色变化依赖程度低,适合背景混淆和光照变化场合下跟踪。K... 详细信息

为提高光照变化和背景混淆下的实时跟踪效果,提出了基于Kalman滤波和边缘直方图特征(edge orientationhistogram,EOH)的实时目标跟踪方法。边缘方向直方图对光照变化不敏感,且对颜色变化依赖程度低,适合背景混淆和光照变化场合下跟踪。Kalman滤波用于预测目标位置和角度,通过预测调整边缘方向直方图的计算得以快速找到跟踪目标,提高边缘方向直方图的匹配能力。经过实际复杂背景和光照场景下与颜色直方图的多组对比测试,颜色直方图很快会失去跟踪目标,EOH能快速正确跟踪,说明EOH和Kalman滤波能在这种场景下快速正确跟踪目标。

关键词：边缘方向直方图 Kalman滤波实时目标跟踪积分直方图背景混淆

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紫椴红松林群落主要乔木树种种间关系

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北华大学学报（自然科学版） 2024年第5期25卷 573-580页

作者：郭昕范春楠程岩刘付鹏宋广文王馨曼王唯瑾北华大学林学院吉林吉林132013 吉林松花江三湖国家级自然保护区管理局吉林吉林132013

以吉林松花江三湖国家级自然保护区紫椴红松林为研究对象,采用总体相关性检验(VR)、χ^(2)检验、联结系数(AC)、共同出现百分率(PC)和点相关系数(Ф)分析群落主要乔木树种在5个层级(Ⅰ级幼苗、Ⅱ级幼树、Ⅲ级小径树、Ⅳ级中径树、Ⅴ级大... 详细信息

以吉林松花江三湖国家级自然保护区紫椴红松林为研究对象,采用总体相关性检验(VR)、χ^(2)检验、联结系数(AC)、共同出现百分率(PC)和点相关系数(Ф)分析群落主要乔木树种在5个层级(Ⅰ级幼苗、Ⅱ级幼树、Ⅲ级小径树、Ⅳ级中径树、Ⅴ级大树)的种间关系。结果表明:主要乔木树种总体相关性为显著正联结,各层级VR介于0.84~1.59;χ^(2)检验结果显示,紫椴-红松在各层级均为不显著联结,二者在Ⅰ、Ⅲ、Ⅳ层级为正联结,在Ⅱ和Ⅴ层级为负联结。主要树种种间关系大多不显著,由Ⅰ级幼苗至V级大树不显著联结种对数占比增加;在Ⅱ和Ⅳ层级,负联结种对数占比最大;AC、PC和Ф值也均表明,紫椴-红松间虽然存在一定联结但联结程度较弱,其他主要树种种间关系多数处于松散的独立状态。总体而言,紫椴红松林群落主要乔木树种已建立了良好的种间关系,可相对稳定地共同利用林地资源。

关键词：紫椴红松林乔木树种层级种间关系联结性

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A non-ACE2-blocking neutralizing antibody against Omicron-included SARS-CoV-2 variants

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Signal Transduction and Targeted Therapy 2022年第2期7卷 372-374页

作者： Xiaomin Duan Rui Shi Pulan Liu Qingrui Huang Fengze Wang Xinyu Chen Hui Feng weijin Huang Junyu Xiao Jinghua Yan CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Protein and Plant Gene Research School of Life SciencesPeking-Tsinghua Center for Life SciencesBeijing Advanced Innovation Center for GenomicsPeking UniversityBeijing 100871China Shanghai Junshi Biosciences Co.Ltd Shanghai 200126China Division of HIV/AIDS and Sextransmitted Virus Vaccines Institute for Biological Product ControlNational Institutes for Food and Drug Control(NIFDC)Beijing 102629China

Dear Editor,The emergence of severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)variants threatens efforts to contain the coronavirus disease 2019(COVID-19)***(B.1.1.529),the fifth novel SARS-CoV-2 variant of concern(VOC),harbors 15 mutations in the receptor-binding domain(RBD)of the spike(S)protein.1 These mutations include almost all the sites of existing VOCs(Alpha/B.1.1.7,Beta/B.1.351,Gamma/P.1,and Delta/B.1.617.2).2–4 Importantly,the key mutations directly interact with the ACE2 receptor and constitute the main target of neutralizing antibodies(NAbs),which is believed to alter the sensitivity to a large number of NAbs.

关键词： ACE2 acute neutral

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Machine learning predicting and engineering the yield,N content,and specific surface area of biochar derived from pyrolysis of biomass

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Biochar 2022年第1期4卷 134-151页

作者： Lijian Leng Lihong Yang Xinni Lei weijin Zhang Zejian Ai Zequn Yang Hao Zhan Jianping Yang Xingzhong Yuan Haoyi Peng Hailong Li School of Energy Science and Engineering Central South UniversityChangsha 410083HunanPeople’s Republic of China. College of Environmental Science and Engineering Hunan UniversityChangsha 410083HunanPeople’s Republic of China

Biochar produced from pyrolysis of biomass has been developed as a platform carbonaceous material that can be used in various *** specific surface area(SSA)and functionalities such as N-containing functional groups of biochar are the most significant properties determining the application performance of biochar as a carbon material in various areas,such as removal of pollutants,adsorption of CO_(2)and H2,catalysis,and energy *** biochar with preferable SSA and N functional groups is among the frontiers to engineer biochar *** study attempted to build machine learning models to predict and optimize specific surface area of biochar(SSA-char),N content of biochar(N-char),and yield of biochar(Yield-char)individually or simultaneously,by using elemental,proximate,and biochemical compositions of biomass and pyrolysis conditions as input *** predictions of Yield-char,N-char,and SSA-char were compared by using random forest(RF)and gradient boosting regression(GBR)*** outperformed RF for most *** input parameters included elemental and proximate compositions as well as pyrolysis conditions,the test R^(2) values for the single-target and multi-target GBR models were 0.90-0.95 except for the two-target prediction of Yield-char and SSA-char which had a test R^(2) of 0.84 and the three-target prediction model which had a test R^(2) of *** indicated by the Pearson correlation coefficient between variables and the feature importance of these GBR models,the top influencing factors toward predicting three targets were specified as follows:pyrolysis temperature,residence time,and fixed carbon for Yield-char;N and ash for N-char;ash and pyrolysis temperature for *** effects of these parameters on three targets were different,but the trade-offs of these three were balanced during multi-target ML prediction and *** optimum solutions were then experimentally verified,which opens a new way for de

关键词： Specific surface area Nitrogen Biochar Pyrolysis Machine learning

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SYNTHESIS OF FUSED PHOSPHORUS HETEROCYCLIC COMPOUNDS(II)

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Chinese Chemical Letters 1995年第10期6卷 851-852页

作者： Hua Zheng YANG Rong Jian LU and Zhen Feng SHANG(National Key Laboratory of Elemento-Organic Chemistry, Nankai University,94 weijin Road, Tianjin 300071) Nankai Univ Natl Key Lab Elementoorgan Chem Tianjin 300071 Peoples R China

Using cation exchange resin(D72,Amberlyst-15) as catalyst, Mannich-type reaction of 5-amino-1,2,4-triazole 1, containing guanidine substructure, provides an efficient synthesis of a new kind of bicyclic P- and N-conta... 详细信息

关键词： II SYNTHESIS OF FUSED PHOSPHORUS HETEROCYCLIC COMPOUNDS

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Capillary pumping independent of the liquid surface energy and viscosity

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Microsystems & Nanoengineering 2018年第1期4卷 423-429页

作者： weijin Guo Jonas Hansson Wouter van der Wijngaart Micro and Nanosystems KTH Royal Institute of TechnologyOsquldas väg 10Stockholm 10044Sweden

Capillary pumping is an attractive means of liquid actuation because it is a passive mechanism,i.e.,it does not rely on an external energy supply during *** capillary flow rate generally depends on the liquid sample viscosity and surface *** poses a problem for capillary-driven systems that rely on a predictable flow rate and for which the sample viscosity or surface energy are not precisely ***,we introduce the capillary pumping of sample liquids with a flow rate that is constant in time and independent of the sample viscosity and sample surface *** features are enabled by a design in which a well-characterized pump liquid is capillarily imbibed into the downstream section of the pump and thereby pulls the unknown sample liquid into the upstream pump *** downstream pump geometry is designed to exert a Laplace pressure and fluidic resistance that are substantially larger than those exerted by the upstream pump geometry on the sample ***,the influence of the unknown sample liquid on the flow rate is *** experimentally tested pumps of the new design with a variety of sample liquids,including water,different samples of whole blood,different samples of urine,isopropanol,mineral oil,and *** capillary filling speeds of these liquids vary by more than a factor 1000 when imbibed to a standard constant cross-section glass *** our new pump design,20 filling tests involving these liquid samples with vastly different properties resulted in a constant volumetric flow rate in the range of 20.96–24.76μL/*** expect this novel capillary design to have immediate applications in lab-on-a-chip systems and diagnostic devices.

关键词： viscosity capillary pump

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