检索结果-南通市图书馆

Recent Progress in Two-dimensional Nanomaterials Following Graphene for Improving Fire Safety of Polymer(Nano)composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第8期39卷 935-956,I0004页

作者： Wei Cai Bi-Bo Wang Xin Wang Yu-Lu Zhu zhao-Xin Li Zhou-Mei Xu Lei Song Wei-zhao hua Yuan hua State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230000China Suzhou Advanced Research Institute University of Science and Technology of ChinaSuzhou 215000China

The high fire safety of polymer nanocomposites is being pursued by research institutions around the *** addition to intrinsic flame retardancy strategy,the additive-type flame retardants have attracted increasing attention due to low commercial cost and easy fabrication ***,traditional additive-type flame retardants usually need high addition amount to achieve a desirable effect which causes many side-effects on the overall performance of polymer materials,such as deteriorated mechanical property and *** present two-dimensional(2D)nanomaterials have also been applied to reduce the fire hazards of polymer(nano)composites with the coupling of barrier function and catalysis as well as carbonization *** though most research work mainly focus on graphene-based flame retardants,more emerging two-dimensional nanomaterials are taking away research attention,due to their complementary and unique properties,mainly including hexagonal boron nitride(h-BN),molybdenum disulfide(MoS2),metal organic frameworks(MOF),carbon nitride(CN),titanium carbide(MXene)and black phosphorene(BP).In this review,except for graphene,the flame retardant mechanism involving different layered nanomaterials are also ***,the functionalization method and flame retardancy effect of different layered nanomaterials are emphatically discussed for offering an effective reference to solve the fire hazards of polymer ***,this work objectively evaluates the practical significance of polymer/layered nanomaterials composites for industrial application.

关键词： Polymer(nano)composites Layered nanomaterials Fire safety Flame retardant mechanism

Cell carrier function of hollow-fiber membrane in rotating wall vessel bioreactor

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2008年第1期2卷 34-39页

作者： Kedong SONG Tianqing LIU hu zhao Xiangqin LI Zhanfeng CUI Xuehu MA Stem Cell and Tissue Engineering Laboratory Dalian University of TechnologyDalian 116024China Department of Engineering Science University of OxfordUK

Large-scale expansion of the osteoblasts of a Sprague-Dawley(SD)rat was studied in a rotating wall hollow-fiber membrane bioreactor(RWHMB)by using hollow-fiber membrane as the *** the sake of contrast,cells were also expanded in a T-flask using a hollow-fiber membrane as carrier and in a rotating wall vessel bioreactor(RWVB)using a *** the culture period,the cells were sampled every 12 h,and after 5 days,the cells were harvested and evaluated with scanning electron microscopy(SEM),hematoxylin-eosin(HE)staining and alkaline phosphatase(ALP)***,von-Kossa staining and Alizarin Red S stain-ing were carried out for mineralized nodules *** results show that in RWHMB,the cells present better morphology and vitality and secrete much more extracel-lular *** is concluded that the RWHMB combines the advantages of the rotating wall vessel and hollow-fiber membrane *** hydrodynamic stimulation within it accelerates the metabolism of the osteoblast and mass transfer,which is propitious to cell differenti-ation and proliferation.

关键词： hollow-fiber membrane microcarrier biore-actor osteoblast expansion

Observations and Modeling of Ice Water Content in a Mixed-Phase Cloud System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2013年第4期6卷 210-215页

作者： HOU Tuan-Jie LEI Heng-Chi hu zhao-Xia FENG Qiu-Juan Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences Weather Modification Office of Shanxi Province

The ice water content(IWC) distribution in a mixed-phase cloud system was investigated using Cloud-Sat data,aircraft measurements,and the Weather Research and Forecasting(WRF) *** precipitation and IWC were in general agreement with rain gauge,sat-ellite,and aircraft *** cloud case was char-acterized by a predominant cold layer and high IWC throughout the cloud-development and precipitation *** CloudSat-retrieved products suggested that the IWC was distributed from 4.0 to 8.0 km,with the maximum values(up to 0.5 g m-3) at 5.0-6.0 km at the earlymature stage of cloud *** IWC(up to 0.8 g m-3) was also detected by airborne probes at 4.2 and 3.6 km at the late-mature *** WRF model simulation re-vealed that the predominant riming facilitated rapid ac-cumulation of high IWC at 3.0-6.0 km.

关键词： aircraft observation ice water content WRF

Chinese Forensic Psychiatry: History, Development and Challenges

在线全文

学校读者我要写书评

暂无评论

Journal of Forensic Science and Medicine 2015年第1期1卷 61-67页

作者： Li Xue Yan‑Wei Shi James L Knoll hu zhao Faculty of Forensic Medicine Zhongshan School of MedicineSun Yat‑Sen UniversityGuangzhouGuangdongChina Department of Psychiatry State University of New York(SUNY)Upstate Medical UniversitySyracuseNew YorkUSA

China has a long history of forensic psychiatry,which can be traced even back to Zhou dynasty(11th century B.C.).However,modern forensic psychiatry has not been set up in China until the *** the interruption of Cultural Revolution of 1966‑1976,there was a period of rapid *** the past five years,a series of judicial identification system reforms have been taking *** 2010,China had 225 forensic psychiatry agencies,2,090 forensic psychiatry experts and 40,822 *** experts are organized within the separate agencies of psychiatric hospitals,universities,the Institute of Forensic Sciences of the Ministry of Justice and other forensic *** from criminal forensic psychiatry,the experts are often asked to evaluate civil competency for the clients involved in civil *** forensic psychiatry has developed rapidly during the past 30 years,and formed the characteristics of its own under the special legal ***,there is still much work for Chinese forensic psychiatrists to do for the future.

关键词： China forensic psychiatry history

A Case of Maternal Half‑sisters Sharing Alleles at 18 X‑chromosomal Short Tandem Repeat Loci

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 Forensic Science and Medicine 2016年第2期2卷 115-118,I0001-I0003页

作者： Qiu‑Ling Liu Li Xue hu zhao De‑Jian Lu Department of Forensic Biology Faculty of Forensic MedicineZhongshan Medical SchoolSun Yat‑sen University74 Zhongshan 2nd RoadGuangzhou 510080P.R.China

Analysis of X‑chromosome short tandem repeats(STRs)is very helpful in deficiency paternity ***,we reported a case of kinship analysis that showed a potentially erroneous inclusion of paternal sisters between two *** two women shared alleles at 18 X‑chromosomal STR loci spanned from 14.76cM(DXS6807)to 184.19cM(DXS7423).When their relatives were not available for testing,biostatistical analysis for the 18 X‑chromosomal STR loci and 24 autosomal STR loci revealed the most possible relationship between the two women was paternal ***,when the father of one woman was available,the other father‑daughter possibility was *** the end,the likelihood ratio of STR marker and mitochondrial DNA(mtDNA)sequences confirmed the two women were maternal *** case emphasizes a cautionary interpretation of X chromosomal marker in deficiency paternity cases with female *** though large parts of the X‑chromosome haplotypes shared by two females,additional relatives and extended DNA typing(such as mtDNA)may be needed further to ascertain whether they are paternal or maternal sisters.

关键词： Haplotype kinship testing recombination X‑chromosome short tandem repeat

Optimizing FeCoNiCrTi high-entropy alloy with hydrogen pumping effect to boost de/hydrogenation performance of magnesium hydride

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3273-3285页

作者： Meng-Chen Song Fu-Ying Wu Yi-Qun Jiang Xiu-Zhen Wang hu zhao Li-Xin Chen Liu-Ting Zhang School of Energy and Power Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China Max Planck Institute for Iron Research 40237DuisseldorfGermany School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The exploration of efficient,long-lived and cost-effective transition metal catalysts is highly desirable for the practical hydrogen storage of magnesium hydride(MgH_(2)) in sustainable energy ***,FeCoNiCrTi high-entropy alloy(HEA) nanosheets were prepared via a facile wet chemical ball milling strategy and they were introduced into MgH_(2) to boost the hydrogen storage *** refined HEA exhibited superior catalytic activity on MgH_(2).In contrast to additive-free MgH_(2),the initial desorption temperature of the constructed MgH_(2)-HEA composite was reduced from 330.0 to 198.5℃ and a remarkable 51% reduction in the dehydrogenation activation energy was ***,the MgH_(2)-HEA composite only required one-twentieth time of that consumed by pure MgH_(2) to absorb 5.0 wt% of H_(2) at 225℃.The synergy between the "hydrogen pumping" effect of Mg_2Ni/Mg_2NiH_4 and Mg_2Co/Mg_2CoH_5 couples,as well as the good dispersion of Fe,Cr and Ti on the surface of MgH_(2) contributed to the enhanced de/hydrogenation performance of the MgH_(2)-HEA *** study furnishes important steering for the design and fabrication of multiple transition metal catalysts and may push the commercial application of magnesium-based hydrides one step forward.

关键词： Hydrogen storage Magnesium hydride High-entropy alloys Catalysis

Comparison of two absorption imaging methods to detect cold atoms in magnetic trap

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第2期24卷 146-151页

作者：王妍胡朝晖亓鲁 Science and Technology on Inertial Laboratory School of Instrumentation Science and Opto-electronics EngineeringBeihang University

Two methods of absorption imaging to detect cold atoms in a magnetic trap are implemented for a high-precision cold atom *** the first method,a probe laser which is in resonance with a cycle transition frequency is used to evaluate the quantity and distribution of the atom *** the second method,the probe laser is tuned to an open transition frequency,which stimulates a few and constant number of photons per *** method has a shorter interaction time and results in absorption images which are not affected by the magnetic field and the light *** make a comparison of performance between these two imaging methods in the sense of parameters such as pulse duration,light intensity,and magnetic field *** experimental results show that the second method is more reliable when detecting the quantity and density profiles of the *** results fit well to the theoretical analysis.

关键词： absorption imaging open-channel transition cold atoms magnetic trap

Physiological response of flag leaf and yield formation of winter wheat under different spring restrictive irrigation regimes in the Haihe Plain,China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第9期20卷 2343-2359页

作者： LIU Xue-jing YIN Bao-zhong hu zhao-hui BAO Xiao-yuan WANG Yan-dong ZHEN Wen-chao College of Agronomy Hebei Agricultural UniversityBaoding 071001P.R.China State Key Laboratory of North China Crop Improvement and Regulation Baoding 071001P.R.China Key Laboratory of Crop Growth Regulation of Hebei Province Baoding 071001P.R.China College of Life Science Hebei Agricultural UniversityBaoding 071001P.R.China

In order to identify the optimum period of spring water-restrictive irrigation for winter wheat(Triticum aestivum L.)in the Haihe Plain,China and elucidate its effects on flag leaf senescence and yield formation,field experiments were conducted at the Xinji Experimental Station of Hebei Agricultural University from 2016 to 2019 by using different irrigation regimes in spring,including the conventional regime involving two irrigation periods(control(CK),the 3-leaf unfolding stage and the anthesis stage)and a series of single,restrictive irrigation regimes(SRI)comprising irrigation at the 3-leaf unfolding stage(3 LI),4 LI,5 LI,and 6 *** are five major findings:(1)The senescence(determined by the green leaf area,GLA)in the 4 LI treatment occurred moderately earlier than that in CK,showed no significant difference with that in 5 LI and 6 LI,and occurred significantly later than that in 3 LI.(2)Compared with other SRI treatments,the GLA value and photosynthetic rate in 4 LI were 14.82 and 20.1%higher,*** analysis of flag leaf also revealed that the mesophyll cells and chloroplasts were irregularly arranged under drought stress in 3 LI and 6 LI;however,drought stress had minimal negative effects on the microstructure in 4 LI and 5 LI.(3)Postponed irrigation in spring could significantly increase superoxide dismutase(SOD)and catalase(CAT)activities in the early stage of grain filling;however,these activities would subsequently *** the four SRI treatments,the overall enzyme activities were the highest in 4 LI,and the combined malondialdehyde(MDA)content in flag leaves in 4 LI and 5 LI was 14.5%lower on average than that in 3 LI and 6 LI.(4)The soluble sugar(SS)and proline(Pro)contents in 4 LI were the highest among the four SRI treatments;however,they were lower than those in *** abscisic acid(ABA)hormone content in 4 LI and 5 LI was lower than that in 3 LI and 6 LI,respectively,suggesting a smaller drought stress effect in 4 LI a

关键词： winter wheat restrictive irrigation flag leaf physiological response yield formation

Theoretical Study on the Effects of Spatial Structure of P Complexation Sites on the Soil Phosphorus Activation in Leonardite humic Acid Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第2期39卷 229-242,184页

作者： CHE Xin SONG Tao LIU Yong hu zhao-Ping GAO Jun Kingenta Ecological Engineering Group Co. Ltd./State Key Laboratory of Nutrition Resources Integrated UtilizationLinyi 276700China Linyi Environmental Monitoring Station Linyi 276000China huazhong Agricultural University Wuhan 430000China

humic acid is an important active component in soil environment. The spatial structures of P complexation sites in humic acid complexes play an important role in soil phosphorus activation and fertilizer efficiency. To explore the effects of spatial structure, the three different coordination modes of iron-carboxyl in models were calculated by the ONIOM method available in the Gaussian09 package. The(U)B3LYP hybrid density functional was employed to optimize the configuration for the QM region, and the UFF force field was used to calculate for the MM region. The results show that the different spatial structures influence the soil phosphorus activation by affecting the electronic structure, Gibbs free energy and interaction energy of the models. And the effects are as follows: the unidentate structure model ~6P-Fe-MHA-UD, the bidentate chelating structure model ~6P-Fe-MHA-BD>the bidentate bridging structure model ~5P-Fe-MHA-BD-BG. It can be known that, the fertilizer efficiency can be improved through increasing the proportion of the unidentate structure and the bidentate chelating structure in production engineering. The research provides a theoretical basis for further optimization of the production of humic acid phosphate fertilizer.

关键词： leonardite humic acid fertilizer efficiency spatial structure phosphorus activation ONIOM method