检索结果-南通市图书馆

Waste activated sludge hydrolysis and acidification： A comparison between sodium hydroxide and steel slag addition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第10期28卷 200-208页

作者： Ying Zhang Chaojie Zhang Xuan Zhang Leiyu Feng Yongmei Li qi zhou State Key Laboratory of Pollution Control and Resources Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China School of Civil Mining and Environmental Engineering Faculty of Engineering and Information Sciences University of Wollongong NSW 2522 Australia East China Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting Group Shanghai 200063 China

Alkaline treatment with steel slag and NaOH addition were investigated under different pH conditions for the fermentation of waste activated sludge. Better performance was achieved in steel slag addition scenarios for both sludge hydrolysis and acidification. More solubilization of organic matters and much production of higher VFA （volatile fatty acid） in a shorter time can be achieved at pH 10 when adjusted by steel slag. Higher enzyme activities were also observed in steel slag addition scenarios under the same pH conditions. Phosphorus concentration in the supematant increased with fermentation time and pH in NaOH addition scenarios, while in contrast most phosphorus was released and captured by steel slag simultaneously in steel slag addition scenarios. These results suggest that steel slag can be used as a substitute for NaOH in sludge alkaline treatment.

关键词： Waste activated sludgeAlkaline treatmentSteel slagSodium hydroxide

Single and joint stress of acetochlor and Pb on three agricultural crops in northeast China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第6期19卷 719-724页

作者： CHAO Lei zhou qi-xing CHEN SU CUI Shuang WANG Mei-e Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China The Graduate School of Chinese Academy of Sciences Beijing 100039 China College of Environmental Science and Engineering Nankai University lianjin 300071 China

In order to evaluate ecological risk of agrochemicals in agricultural environment, single and joint toxic effects of an important herbicide and a typical heavy metal on root elongation of crops were investigated. Seeds of the three crops including wheat （Triticum aestivum）, Chinese cabbage （Brassica pekimensis） and soybean （Glycine max） as the main crops in northeast China were exposed to acetochior as a herbicide and lead （Pb） as a heavy metal using the pot-culture method, and meadow brown soil as one of the main soils distributed in northeast China was applied in the investigation. The results indicated that the interactive effects of the two pollutants on root elongation of the three crops were very complicated although they had markedly significant （P〈0.01） linear interrelationships based on the regression analyses. When the concentration of added Pb^2＋ reached 200 mg/kg, acetochlor and Pb had an antagonistic effect on the inhibition of root elongation of the three crops. However, acetochlor and Pb had significantly （P〈0.05） synergic effects on the inhibition of root elongation when concentration of added Pb^2＋ was up to 1000 mg/kg. At the low concentration of added Pb, joint toxicity of acetochlor and Pb was more dependent on the concentration of Pb. Among the three crops, wheat was the most sensitive to the toxicity of Pb and Chinese cabbage was the most sensitive to the toxicity of acetochlor.

关键词： acetochlor Pb ecotoxicology joint effect Chinese cabbage (Brassica pekimensis) soybean (Glycine max) wheat (Triticum aestivum)

Dynamic evolution of transposable elements,demographic history,and gene content of paleognathous birds

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2021年第1期42卷 51-61页

作者： Zong-Ji Wang Guang-Ji Chen Guo-Jie Zhang qi zhou Institute of Animal Sex and Development Zhejiang Wanli UniversityNingboZhejiang 315100China MOE Laboratory of Biosystems Homeostasis&Protection Life Sciences InstituteZhejiang UniversityHangzhouZhejiang 310058China Department of Neuroscience and Developmental Biology University of ViennaVienna 1090Austria BGI-Shenzhen Beishan Industrial ZoneShenzhenGuangdong 518083China State Key Laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Section for Ecology and Evolution Department of BiologyUniversity of CopenhagenCopenhagen DK-2100Denmark Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunmingYunnan 650223China Center for Reproductive Medicine The Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhouZhejiang 310058China

Palaeognathae includes ratite and tinamou species that are important for understanding early avian ***,we analyzed the whole-genome sequences of 15 paleognathous species to infer their demographic histories,which are presently *** found that most species showed a reduction of population size since the beginning of the last glacial period,except for those species distributed in Australasia and in the far south of South *** degrees of contraction and expansion of transposable elements(TE)have shaped the paleognathous genome architecture,with a higher transposon removal rate in tinamous than in *** repeat family,AviRTE,likely underwent horizontal transfer from tropical parasites to the ancestor of little and undulated tinamous about 30 million years *** analysis of gene families identified rapid turnover of immune and reproductionrelated genes but found no evidence of gene family changes underlying the convergent evolution of flightlessness among *** also found that mitochondrial genes have experienced a faster evolutionary rate in tinamous than in ratites,with the former also showing more degenerated W *** result can be explained by the Hill-Robertson interference affecting genetically linked W chromosomes and ***,we reconstructed the evolutionary history of the Palaeognathae populations,genes,and *** findings of co-evolution between mitochondria and W chromosomes highlight the key difference in genome evolution between species with ZW sex chromosomes and those with XY sex chromosomes.

关键词： Paleognaths Demographic history Transposable elements Gene families Mitochondria

Three-dimensional bioprinting speeds up smart regenerative medicine

在线全文

学校读者我要写书评

暂无评论

National Science Review 2016年第3期3卷 331-344页

作者： qi Gu He Zhu Jing Li Xia Li Jie Hao Gordon G.Wallace qi zhou State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of Sciences ARC Centre of Excellence for Electromaterials Science(ACES) Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of Wollongong

Biological materials can actively participate in the formation of bioactive organs and can even control cell fate to form functional tissues that we name as the smart regenerative medicine(SRM). The SRM requires interdisciplinary efforts to finalize the pre-designed organs. Three-dimensional(3D) printing, as an additive manufacturing technology, has been widely used in various fields due to its high resolution and individuation. In SRM, with the assistance of 3D printing, cells and biomaterials could be precisely positioned to construct complicated tissues. This review summarizes the state of the SRM advances and focuses in particular on the 3D printing application in biofabrication. We further discuss the issues of SRM development and finally propose some approaches for future 3D printing, which involves SRM.

关键词： 3D bioprinting regenerative medicine biomaterials tissues

High threshold voltage enhancement-mode GaN p-FET with Sirich LPCVD SiN_(x) gate insulator for high hole mobility

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2023年第8期44卷 78-86页

作者： Liyang Zhu Kuangli Chen Ying Ma Yong Cai Chunhua zhou Zhaoji Li Bo Zhang qi zhou State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-tech and Nano-bionicsCASSuzhou 215123China Institute of Electronic and Information Engineering University of Electronic Science and Technology of ChinaDongguan 523808China

In this work,the GaN p-MISFET with LPCVD-SiN_(x) is studied as a gate dielectric to improve device *** changing the Si/N stoichiometry of SiN_(x),it is found that the channel hole mobility can be effectively enhanced with Si-rich SiN_(x) gate dielectric,which leads to a respectably improved drive current of GaN *** record high channel mobility of 19.4 cm2/(V∙s)was achieved in the device featuring an Enhancement-mode *** from the significantly improved channel mobility,the fabricated E-mode GaN p-MISFET is capable of delivering a decent-high current of 1.6 mA/mm,while simultaneously featuring a negative threshold-voltage(VTH)of–2.3 V(defining at a stringent criteria of 10μA/mm).The device also exhibits a well pinch-off at 0 V with low leakage current of 1 nA/*** suggests that a decent E-mode operation of the fabricated p-FET is *** addition,the VTH shows excellent stability,while the threshold-voltage hysteresisΔVTH is as small as 0.1 V for a gate voltage swing up to–10 V,which is among the best results reported in the *** results indicate that optimizing the Si/N stoichiometry of LPCVD-SiN_(x) is a promising approach to improve the device performance of GaN p-MISFET.

关键词： p-channel GaN p-FET LPCVD channel mobility hole mobility enhancement-mode

Nodulation and molecular characterization of pure culturesisolated from root nodules of Coriaria nepalensis

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第8期43卷 695-698页

作者： Chuanjiong Hu Pingzhen zhou qi zhou Huakui Chen A. D. L. Akkermans Huazhong Agr Univ Coll Life Sci & Technol Wuhan 430062 Peoples R China Chinese Acad Agr Sci Inst Oil Crops Wuhan 430062 Peoples R China Agr Univ Wageningen Dept Microbiol NL-6703 CT Wageningen Netherlands

Four strains with typical morphology of actinomycete genus of Frankia were isolated from root nodules of Coriaria nepalensis. They were shown to nodulate the seedlings of host plant and hybridize with Frankia 16S rRNA targeted oligonucleotide probes, indicating that they did belong to the genus Frankia. Furthermore, by nifHDK probe hybridizations, the homologous fragments of nifHDK genes were detected among the bacteria, and they were located in various sizes of restriction fragments of total DNA, showing diverse patterns of restriction fragment length polymorphisms of nifHDK gene (nifHDK_RFLPs). The PCR_based amplification and cloning of nifH gene throw light on the molecular phylogeny of Coriaria_infective Frankia.

关键词： Frankia Coriaria nepalensis nodulation molecular characterization.

分布式光伏直流汇聚接入拓扑及多级协同控制策略

在线全文

学校读者我要写书评

暂无评论

供用电 2025年第1期42卷 43-51页

作者：周琦袁宇波张宸宇刘建刘瑞煌王鑫达国网江苏省电力有限公司电力科学研究院江苏南京211103

为了解决大规模分布式光伏接入给配电网带来的倒送重过载问题,从接入方式出发,提出分布式光伏直流汇聚接入方案及多级协同控制策略。该方案相比于常规的交流接入方案可进一步降低投资成本,增加光伏接入半径,同时避免了电能质量问题。该... 详细信息

为了解决大规模分布式光伏接入给配电网带来的倒送重过载问题,从接入方式出发,提出分布式光伏直流汇聚接入方案及多级协同控制策略。该方案相比于常规的交流接入方案可进一步降低投资成本,增加光伏接入半径,同时避免了电能质量问题。该控制策略与最大功率点跟踪方式不同,当分布式光伏大发时,并网变换器转变为恒功率控制模式,限制并网变换器的输出功率,同时分布式光伏变换器采用电压-功率下垂控制策略,维持直流母线电压在可控范围内,实现了分布式光伏的可调可控。仿真结果表明,所提的多级协调控制策略具有良好的暂稳态控制性能,可保证直流母线电压的稳定,同时根据下垂系数对不同分布式光伏输出功率进行灵活控制,保证了输出功率在可控范围之内,对后续农村地区分布式光伏的并网提供了理论参考。

关键词：分布式光伏多级协同下垂控制最大功率点跟踪新能源消纳

Synthesis of Poly(styrene-b-isoprene-b-styrene)viaNitroxide-mediated Radical Polymerization by a Novel Alkoxyamine

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2005年第5期21卷 615-618页

作者： GAO Long-cheng PAN qi-wei FAN Xing-he CHEN Xiao-fang WAN Xin-hua zhou qi-feng College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Bering 100871 P. R. China

Bifunctional alkoxyamine bis-TIPNO derived from 2,2,5-trimethyl-4-phenyl-3-azahexane-3-oxyl （TIPNO） and α, ω-alkyl bromide by atom transfer radical addition（ATRA） was employed as “biradical initiator” for nitroxide-mediated radical polymerization（NMRP） of isoprene and styrene. The kinetics study for the polymerization of styrene at different time showed living features. The poly（styrene-b-isoprene-b-styrene）（SIS） copolymers have two glass transition temperatures, indicating the immiscibility of the corresponding blocks.

关键词： Radical polymerization Block copolymer Nitroxide Isoprene

Regulation beyond genome sequences: DNA and histone methylation in embryonic stem cells

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2010年第1期5卷 41-47页

作者： Wei YANG qi zhou Xiu-Jie WANG State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Graduate University of the Chinese Academy of Sciences Beijing 100101China

Embryonic stem(ES)cells distinct themselves from other cell type populations by their pluripotent *** unique features of ES cells are controlled by both genetic and epigenetic *** have shown that the methylation status of DNA and histones in ES cells is quite different from that of differentiated cells and somatic stem ***,we summarized recent advances in DNA and histone methylation studies of mammalian ES *** methylation status of several key pluripotent regulatory genes is also discussed.

关键词： Embryonic stem(ES)cells epigenetic DNA methylation histone methylation