检索结果-南通市图书馆

Improved flotation performance of hematite fines using citric acid as a dispersant

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1119-1125页

作者： Xi-mei Luo wan-zhong Yin Chuan-yao Sun Nai-ling wang Ying-qiang Ma Yun-fan wang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Kunming 650093 China Faculty of Land and Resource Engineering Kunming University of Science and Technology Kunming 650093 China College of Zijin Mining Fuzhou University Fuzhou 350116 China College of Resources and Civil Engineering Northeastem University Shenyang 110819 China Beijing General Research Institute of Mining and Metallurgy Beijing 100044 China Faculty of Minerals Processing and Bioengineering Central South University Changsha 410083 China

In this study, citric acid was used as a dispersant to improve the flotation performance of hematite fines. The effect and mechanism of citric acid on the reverse flotation of hematite fines were investigated by flotation tests, sedimentation experiments, scanning electron microscopy（SEM）, zeta-potential measurements, and X-ray photoelectron spectroscopy（XPS）. The results of SEM analysis and flotation tests reveal that a strong heterocoagulation in the form of slime coating or coagulation in hematite fine slurry affects the beneficiation of hematite ores by froth flotation. The addition of a small amount of citric acid（less than 300 g/t） favorably affects the reverse flotation of hematite fines by improving particle dispersion. The results of sedimentation experiments, zeta-potential measurements, and XPS measurements demonstrate that citric acid adsorbs onto hematite and quartz surfaces via hydrogen bonding, thereby reducing the zeta potentials of mineral surfaces, strengthening the electrical double-layer repulsion between mineral particles, and dispersing the pulp particles.

关键词： hematite citric acid dispersion flotation hydrogen bonding

InvasionDB: A genome and gene database of invasive alien species

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第1期20卷 191-200页

作者： HUANG Cong LANG Kun QIAN wan-qiang wanG Shu-ping CAO Xiao-mei HE Rui ZHAN An-ran CHEN Meng-yao YANG Nian-wan LI Fei Key Laboratory for Biology of Plant Disease and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120P.R.China Minstry of Agriculture and Rural Affairs Key Laboratory of Molecular Biology of Crop Pathogens and Insects Institute of Insect SciencesZhejiang UniversityHangzhou 310058P.R.China Technical Centre for Animal Plant and Food Inspection and Quarantine Shanghai CustomsShanghai 200135P.R.China Chinese Academy of Inspection and Quarantine Beijing 100176P.R.China China National Center for Biotechnology Development Beijing 100039P.R.China

Invasive alien species(IAS) are species whose introduction to areas outside of their native range cause harm to economics, biodiversity, and the environment. Understanding the genetic basis of invasiveness is critical for preventing invasion by an alien species and managing IAS with eco-friendly control methods. In addition, uncovering the genomic features of IAS is essential for accurately predicting invasiveness. However, even though increasing efforts have been devoted to sequencing the genomes of IAS, there is still not an integrated genome database for the invasive biology community. Here, we first determined a list of invasive plants and animals by mining references and databases. Then, we retrieved the genomic and gene data of these IAS, and constructed a database, Invasion DB. Invasion DB encompasses 131 IAS genomes, 76 annotated IAS assemblies, and links these data to conventional functions such as searching for gene coding sequences and Pfam, KEGG, NR annotations, BLAST server, JBrowse, and downloads services. Next, we analyzed 19 invasivenessrelated gene families which confer invasiveness in insects. To study the roles of noncoding RNA in invasiveness, we also annotated 135 494 mi RNAs, 89 294 r RNAs, and 2 671 941 t RNAs from these IAS. In summary, Invasion DB is useful for studying the invasiveness at the genomic level, and thus helps to develop novel management strategies to control IAS.

关键词： database invasive alien species genomic gene family non-coding RNA

Designing solid-state interfaces on lithium-metal anodes: a review

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第10期62卷 1286-1299页

作者： Chen-Zi Zhao Hui Duan Jia-Qi Huang Juan Zhang qiang Zhang Yu-Guo Guo Li-Jun wan Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

Li-metal anodes are one of the most promising energy storage systems that can considerably exceed the current technology to meet the ever-increasing demand of power applications. The apparent cycling performances and dendrite challenges of Li-metal anodes are highly influenced by the interface layer on the Li-metal anode because the intrinsic high reactivity of metallic Li results in an inevitable solid-state interface layer between the Li-metal and electrolytes. In this review, we summarize the recent progress on the interfacial chemistry regarding the interactions between electrolytes and ion migration through dynamic interfaces. The critical factors that affect the interface formation for constructing a stable interface with a low resistance are reviewed. Moreover, we review emerging strategies for rationally designing multiple-structured solid-state electrolytes and their interfaces, including the interfacial properties within hybrid electrolytes and the solid electrolyte/electrode interface. Finally, we present scientific issues and perspectives associated with Li-metal anode interfaces toward a practical Li-metal battery.

关键词： lithium-metal anode solid-state electrolyte energy chemistry rechargeable lithium-metal batteries solid electrolyte/electrode interface

在线全文

学校读者我要写书评

暂无评论

我国区域用水总量演变规律及驱动效应研究

中国农村水利水电 2024年第8期 112-119页

作者：万嘉锐杨明智许继军桑连海刘强程卫帅流域水资源与生态环境科学湖北省重点实验室(长江水利委员会长江科学院) 湖北武汉430010 长江水利委员会长江经济带保护与发展战略研究中心湖北武汉430010

针对当前我国稳步推进的节水和水网建设的工作需求,以及水资源时空分布严重不均,各地区经济发展水平、人口规模等存在较大差异的特点,利用我国2000-2020年各省级行政区的用水量、产业增加值、人口结构等数据,采用LMDI指数分解法和GDP不... 详细信息

针对当前我国稳步推进的节水和水网建设的工作需求,以及水资源时空分布严重不均,各地区经济发展水平、人口规模等存在较大差异的特点,利用我国2000-2020年各省级行政区的用水量、产业增加值、人口结构等数据,采用LMDI指数分解法和GDP不变价换算方法,从时间和空间两个角度分析了各分区用水总量、用水结构变化差异以及用水强度、产业结构、经济规模和人口规模四方面驱动效应的强度和贡献比例,旨在支撑我国水资源规划和管理以及用水结构调整。从时间角度,经济增长是我国用水总量增加的最主要驱动因素,行业用水强度降低和产业结构调整尤其是第一产业用水强度和占比的降低是抑制区域用水总量增加的主要因素,其中用水强度效应略大于产业结构效应,而人口规模增加对用水总量增加的作用效果不明显,因此我国的用水量控制应该在提高用水效率、优化升级产业结构的策略上。从空间角度方面,我国各大分区4种驱动效应对用水总量上升的促进或抑制作用稳定,西南、西北等内陆地区需要在优化产业结构的基础上大力发展经济规模,同时西北地区还迫切需要提高第一产业用水效率,而华东地区可适当控制人口规模,东北和西北则需要控制人口流出,以缩小我国各区域用水量的空间差异。

关键词：用水总量变化规律时空差异驱动效应 LMDI法

基于方向性探头的双轴塑性变形定量涡流检测研究

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

实验力学 2024年第2期39卷 168-182页

作者：曾鑫磊万强陈文彰晏顺坪李越任淑廷解社娟陈振茂西安交通大学航天航空学院复杂服役环境重大装备结构强度与寿命全国重点实验室陕西省无损检测与结构完整性评价中心陕西西安710049 航空工业第一飞机设计研究院强度设计研究所陕西西安710089 中国工程物理研究院总体工程研究所四川绵阳621999

核电结构服役过程中,构件可能由于地震等意外载荷产生塑性变形,危害结构安全。实际构件的受力变形大多是复杂的双轴,目前对双轴塑性变形的检测研究尚较少。本文针对核电站中典型的奥氏体不锈钢材料,在基于其单轴塑性变形和电磁属性关系... 详细信息

核电结构服役过程中,构件可能由于地震等意外载荷产生塑性变形,危害结构安全。实际构件的受力变形大多是复杂的双轴,目前对双轴塑性变形的检测研究尚较少。本文针对核电站中典型的奥氏体不锈钢材料,在基于其单轴塑性变形和电磁属性关系的基础上,首先结合莫尔圆理论建立双轴塑性变形条件下材料的周向电磁属性分布计算公式,并进行了实验验证,同时基于实验结果得到切应变对电导率影响较小的结论.然后,提出三相品字形方向性探头构型,通过数值模拟分析其检测机理,基于皮尔逊相关系数建立双轴塑性变形定量涡流检测方法,并对该方法进行了数值验证;最后,制作品字形传感器,搭建实验系统,进而通过实验验证了本研究所开发的双轴塑性变形定量检测方法的有效性。

关键词：奥氏体不锈钢双轴塑性变形电磁属性涡流检测品字形探头

甲维盐与阿维菌素对褐飞虱繁殖力及天敌稻虱缨小蜂控害能力的影响

在线全文

学校读者我要写书评

暂无评论

昆虫学报 2024年第4期67卷 538-548页

作者：何佳春王康逸 Mubashar HUSSAIN 魏琪万品俊赖凤香王渭霞傅强中国水稻研究所水稻生物育种全国重点实验室杭州311401 重庆市涪陵区经济作物发展中心重庆408000

【目的】评估甲维盐和阿维菌素两种药剂对褐飞虱Nilaparvata lugens繁殖力及其寄生性天敌稻虱缨小蜂Anagrus nilaparvatae的影响,探明两种药剂引起褐飞虱田间再猖獗的原因。【方法】田间调查了使用5%甲氨基阿维菌素苯甲酸盐(甲维盐)微乳... 详细信息

【目的】评估甲维盐和阿维菌素两种药剂对褐飞虱Nilaparvata lugens繁殖力及其寄生性天敌稻虱缨小蜂Anagrus nilaparvatae的影响,探明两种药剂引起褐飞虱田间再猖獗的原因。【方法】田间调查了使用5%甲氨基阿维菌素苯甲酸盐(甲维盐)微乳剂(microemulsion,ME)(用量225 mL/hm^(2))和5%阿维菌素悬浮剂(suspension concentrate,SC)(用量240 mL/hm^(2))后对田间褐飞虱虫口密度和稻虱缨小蜂成蜂寄生率的影响;室内试验采用稻茎浸渍法测定甲维盐和阿维菌素对褐飞虱4龄若虫的毒力以及不同浓度(LC_(15),LC_(30),LC_(50)和LC_(75))甲维盐和阿维菌素对褐飞虱繁殖力及稻虱缨小蜂成蜂存活和寄生能力的影响,同时采用玻璃管药膜法测定了这两种药剂对稻虱缨小蜂成蜂的毒力,评价了其风险级别。【结果】田间调查结果显示,施用5%甲维盐ME或5%阿维菌素SC显著增加了田间褐飞虱虫口密度,显著降低了稻虱缨小蜂成蜂田间寄生率。室内生物测定结果显示甲维盐和阿维菌素对褐飞虱4龄若虫的LC 50值分别为1.20和2.03 mg/L,各浓度(LC_(15)~LC_(75))甲维盐和中低致死浓度(LC_(15)~LC_(50))阿维菌素处理后的褐飞虱成虫单雌产卵量均显著高于对照。甲维盐和阿维菌素对稻虱缨小蜂成蜂的LC_(50)值分别为0.0145和0.0205 mg/L,田间用量的安全系数分别为4.52×10^(-4)~9.05×10^(-4)和8.52×10^(-4)~14.22×10^(-4),均为极高风险性药剂。【结论】甲维盐和阿维菌素会引起田间褐飞虱的再猖獗,主要有两方面的原因,一是刺激褐飞虱雌成虫产卵,二是作为稻虱缨小蜂的高风险药剂,极大地削弱了该蜂对褐飞虱的控害作用。因此,应减少两种药剂在稻田的使用,避免导致褐飞虱的再猖獗。

关键词：褐飞虱稻虱缨小蜂甲维盐阿维菌素再猖獗繁殖力寄生率

同方期刊数据库

Dwarfi ng apple rootstock responses to elevated temperatures: A study on plant physiological features and transcription level of related genes

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第5期15卷 1025-1033页

作者： ZHOU Bei-bei SUN Jian LIU Song-zhong JIN wan-mei ZHANG qiang WEI Qin-ping Institute of Forestry & Pomology Beijing Academy of Agriculture & Forestry Sciences/Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China) Ministry of Agriculture

The aim of this study was to investigate the impact of heat stress on physiological features, together with endogenous hormones and the transcription level of related genes, to estimate the heat resistance ability and stress injury mechanism of different dwarfing apple rootstocks. Among the six rootstocks, the rootstocks of native Shao series（SH series） showed better heat stress resistance than those of Budagovski 9（B9）, Cornell-Geneva 24（CG24）, and Malling 26（M26） from abroad. Among SH series rootstocks, SH1 and SH6 showed higher heat stress resistance than SH40. M26 demonstrated the lowest adaption ability to heat stress, showing higher leaf conductivity and lower liquid water content（LWC） with the increase in temperature. Heat stress also resulted in the suppression of photosynthesis, which showed no significant restoration after 7-day recovery. It should be noted that although a higher temperature led to a lower LWC and photosynthetic efficiency（P_n） of CG24, there was no significant increase in leaf conductivity, and 7 days after the treatment, the P_n of CG24 recovered. The extremely high temperature tolerance of SH series rootstocks could be related to the greater osmotic adjustment（OA）, which was reflected by smaller reductions in leaf relative water content（RWC） and higher turgor potentials and leaf gas exchange compared with the other rootstocks. Determination of hormones indicated multivariate regulation, and it is presumed that a relatively stable expression levels of functional genes under high-temperature stress is necessary for heat stress resistance of rootstocks.

关键词： dwarfing apple rootstock SH series rootstocks heat stress physiological features

Functional polymorphism among members of abscisic acid receptor family (ZmPYL) in maize

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第9期19卷 2165-2176页

作者： LU Feng-zhong YU Hao-qiang LI Si LI wan-chen ZHANG Zhi-yong FU Feng-ling Maize Research Institute Sichuan Agricultural UniversityChengdu 6111130P.R.China College of Life Sciences Neijiang Normal UniversityNeijiang 641100P.R.China

Pyrabactin resistance 1-like proteins (PYLs) are direct receptors of abscisic acid (ABA). For the redundant and polymorphic functions, some members of the PYL family interact with components of other signaling pathways. Here, 253 positive colonies from a maize cDNA library were screened as interacting proteins with the members of ZmPYL family. After sequencing and function annotation, 17 of 28 interaction combinations were verified by yeast two-hybrid (Y2H). The germination potential, taproot length and proline content of a quartet mutant of Arabidopsis PYL genes were significantly deceased comparing to the wild type (WT) under alkaline stress (pH 8.5) and 100 μmol L–1 methyl jasmonate (MeJA) induction. The malondialdehyde (MDA) content was significantly increased. After germinating in darkness, the characteristics of dark morphogenesis of the quartet mutant seedlings were more obvious than those of the WT. The differential expression of the related genes of photomorphogenesis in the mutant was much more than that in the WT. Three light and two JA responsive cis-affecting elements were identified during the promoter sequences of the AtPYL1 and AtPYL2 genes. These results suggested that functional polymorphism has evolved among the members of ZmPYL family. In response to developmental and environmental stimuli, they not only function as direct ABA receptors but also interact with components of other signaling pathways mediated JA, brassinosteroid (BR), auxin, etc., and even directly regulate downstream stress-related proteins. These signaling pathways can interact at various crosstalk points and different levels of gene expression within a sophisticated network.

关键词： abscisic acid functional polymorphism maize receptor signaling

A Three-dimensional Non-fullerene Small Molecule Acceptor for Solution-processed Organic Solar Cellst

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第11期35卷 1687-1692页

作者： Meijia Chang Yunchuang wang Nailiang Qiu Yuan-Qiu-qiang Yi Xiangjian wan Chenxi Li Yongshen Chen State Key Laboratory of Elemento-Organic Chemistry Centre of Nanoscale Science and Technology andKey La- boratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 China

An acceptor-donor-acceptor （A-D-A） three-dimensional （3D） small molecule acceptor （SFTTIC）, using spiro- bifluorene as the core unit linking with four thieno[3,2-b]thiophenes （TT） and end-capped with 2-（3-oxo-2,3-dihy- dro-lH-inden-l-ylidene）malononitrile （INCN） was developed for solution processed organic solar cells. SFTTIC has a high absorption coefficient up to 3.12 × 105 mol-1,cm-1, good thermal stability and appropriate energy levels. The optimized power conversion efficiency （PCE） of 5.66% and 4.65% was achieved for the devices with PBDB-T：SFTTIC and PTB7-Th：SFTTIC, respectively.

关键词： organic solar cells non-fullerene acceptor solution processed three-dimensional structure