检索结果-南通市图书馆

维普期刊数据库博看期刊

Coating of microbially produced calcium carbonate onto stone materials

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第2期58卷 266-272页

作者： zhu wen kun MU Tao ZHANG You Kui DUAN Tao LUO Xue Gang Engineering Research Center of Biomass Materials Ministry of Education Southwest University of Science and Technology China Academy of Engineering Physics Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology and Research Center of Laser FusionCAEP

The coatings of microorganism-induced calcium carbonate onto the stone surface carried out by using both of the immersion method and coating method were investigated. Various analysis and testing techniques such as scanning electron micrograph （SEM） and X-ray diffraction （XRD） were used to characterize the deposited mineral layer. The adhesive property, acid re- sistance, frost resistance, light and aging resistance, water adsorption and permeability were investigated in detail. The results showed that both immersion method and coating method could produce calcium carbonate granules with sizes ranging from 1 to 10 pm and form a layer of dense mineralization membrane which is about 50 to 100 pm thick. Immersion method was more efficient than coating method. The large cohesive force between calcium carbonate layer and stone materials could improve the acid rain resistance as well as excellent heat tolerance, frost resistance and light aging resistance. The coating process could not only help the stone materials maintain its original permeability with the aid of calcium carbonate layers but also improve the penetration resistance significantly. Therefore, this type of technology shows a great potential in the protection of stone relics.

关键词： microorganism microbially induced deposited-layer stone materials

Regulation of Microstructure of Calcium Carbonate Crystals by Egg White Protein

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第2期28卷 180-185页

作者： zhu wen-kun LUO Xue-gang ZHANG Chi DUAN Tao ZHOU Jian School of National Defense Science and Technology Southwest University of Science and TechnologyMianyang 621010P.R.China Engineering Research Center of Biomass Materials of Ministry of Education Southwest University of Science and TechnologyMianyang 621010P.R.China

Crystal growth of calcium carbonate in biological simulation was investigated via egg white protein with different volume fractions,during which calcium carbonate was synthesized by calcium chloride and sodium *** morphology,thermal properties and microstructure of the calcium carbonate micro-to-nanoscale crystals were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FTIR）,thermogravimetric analysis（TG） and X-ray diffraction（XRD） *** results show that the volume fraction of egg white protein has great influence on the shape,size and morphology of calcium carbonate *** calcium carbonate crystals were the mixtures of calcite-vaterite-like crystals including spherical and rough surface,which are different from that formed in pure *** the increase of egg white protein concentration,the diameter of calcium carbonate crystals changed,the amount of formed spherical calcium carbonate particles decreased and that of vaterite *** results indicate that the coordination and electrostatic interaction between egg white protein and Ca2＋ significantly affect the calcium carbonate crystalization.

关键词： Egg white protein Spherical calcium carbonate Vaterite Calcite

Synergistic catalysis of the N-hydroxyphthalimide on flower-like bimetallic metal-organic frameworks for boosting oxidative desulfurization

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 674-682页

作者： Jing He kun zhu Wei Jiang Dong-Ao zhu Lin-Hua zhu Hai-Yan Huang wen-Shuai zhu Hua-Ming Li Institute for Energy Research Jiangsu UniversityZhenjiang212013JiangsuChina College of Chemistry and Chemical Engineering Hainan Normal UniversityKey Laboratory of Water Pollution Treatment and Resource Reuse of Hainan ProvinceHaikou571158HainanChina

Synergic catalytic effect between active sites and supports greatly determines the catalytic activity for the aerobic oxidative desulfurization of fuel *** this work,Ni-doped Co-based bimetallic metal-organic framework(CoNi-MOF)is fabricated to disperse N-hydroxyphthalimide(NHPI),in which the whole catalyst provides plentiful synergic catalytic effect to improve the performance of oxidative desulfurization(ODS).As a bimetallic MOF,the second metal Ni doping results in the flower-like morphology and the modification of electronic properties,which ensure the exposure of NHPI and strengthen the synergistic effect of the overall *** with the monometallic Co-MOF and naked NHPI,the NHPI@CoNi-MOF triggers the efficient activation of molecular oxygen and improves the ODS performance without an *** sulfur removal of dibenzothiophene-based model oil reaches 96.4%over the NHPI@CoNi-MOF catalyst in 8 h of ***,the catalytic product of this aerobic ODS reaction is sulfone,which is adsorbed on the catalyst surface due to the difference in *** work provides new insight and strategy for the design of a strong synergic catalytic effect between NHPI and bimetallic supports toward high-activity aerobic ODS materials.

关键词： Metal-organic frameworks Doped Bimetallic N-hydroxyphthalimide Aerobic processes Oxidative desulfurization

ZIF-8有机框架衍生的D-ZnO@Fe_(x)O_(y)S型异质结用于光辅助铀还原

在线全文

学校读者我要写书评

暂无评论

核化学与放射化学 2024年第4期46卷 345-357,I0002页

作者：谢禹志汪鹏董欢欢王瑞祥张福城于杭鑫赵乙丁张永翔竹文坤陈涛西南科技大学国防科技学院生命科学与工程学院环境友好能源材料国家重点实验室核废物与环境安全省部共建协同创新中心国家原子能机构核环境安全技术创新中心西南科大四川天府新区创新研究院四川绵阳621010

光催化辅助铀提取作为一种新型的铀提取技术,有望克服传统工艺中多种金属离子与U(Ⅵ)的竞争配位以及富集容量有限的难题。在这项研究中,以ZIF-8为前驱体,通过浸渍和高温热解制备了S型ZIF-8衍生氧化锌@铁氧化物(D-ZnO@Fe_(x)O_(y))异质结... 详细信息

光催化辅助铀提取作为一种新型的铀提取技术,有望克服传统工艺中多种金属离子与U(Ⅵ)的竞争配位以及富集容量有限的难题。在这项研究中,以ZIF-8为前驱体,通过浸渍和高温热解制备了S型ZIF-8衍生氧化锌@铁氧化物(D-ZnO@Fe_(x)O_(y))异质结,用于光辅助还原铀矿废水中的U(Ⅵ)。相比于铁氧化物(Fe_(x)O_(y))和ZIF-8衍生ZnO(D-ZnO),S型异质结D-ZnO@Fe_(x)O_(y)在竞争离子存在下,表现出优异的光辅助铀还原能力(>95%)。通过能带计算证实了在异质结界面形成内置电场,能够有效增强电子定向迁移,并为促进铀的光辅助还原提供了强大的驱动力。机理研究表明,羟基自由基和超氧自由基是参与光催化还原U(Ⅵ)的主要物质。本研究为探索具有高效光电子分离功能的光催化剂还原U(Ⅵ)提供了一条有价值的途径。

关键词： S型异质结光催化 ZIF-8 铀还原

Aboveground biomass stocks of species-rich natural forests in southern China are influenced by stand structural attributes,species richness and precipitation

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

Plant Diversity 2024年第4期46卷 530-536页

作者： wen-Hao Zeng Shi-Dan zhu Ying-Hua Luo Wei Shi Yong-Qiang Wang kun-Fang Cao State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of ForestryGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Forest Ecology and Conservation College of ForestryGuangxi UniversityNanning 530004China Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwestern China School of Life SciencesGuizhou Normal UniversityHuaxi College TownGui'an DistrictGuiyang 550025China

Forests,the largest terrestrial carbon sinks,play an important role in carbon sequestration and climate change *** forest attributes and environmental factors have been shown to impact aboveground biomass,their influence on biomass stocks in species-rich forests in southern China,a biodiversity hotspot,has rarely been *** this study,we characterized the effects of environmental factors,forest structure,and species diversity on aboveground biomass stocks of 30 plots(1 ha each) in natural forests located within seven nature reserves distributed across subtropical and marginal tropical zones in Guangxi,*** results indicate that forest aboveground biomass stocks in this region are lower than those in mature tropical and subtropical forests in other ***,we found that aboveground biomass was positively correlated with stand age,mean annual precipitation,elevation,structural attributes and species richness,although not with species *** we compared stands with the same basal area,we found that aboveground biomass stock was higher in communities with a higher coefficient of variation of diameter at breast *** findings highlight the importance of maintaining forest structural diversity and species richness to promote aboveground biomass accumulation and reveal the potential impacts of precipitation changes resulting from climate warming on the ecosystem services of subtropical and northern tropical forests in ***,many natural forests in southern China are not fully ***,their continued growth will increase their carbon storage over time.

关键词： Subtropical forest Marginal tropical forest Aboveground biomass Species diversity Forest structural attribute Environment factor

Pachymic acid exerts antitumor activities by modulating the Wnt/β-catenin signaling pathway via targeting PTP1B

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2024年第4期14卷 170-180页

作者： Hao Zhang kun zhu Xue-Feng Zhang Yi-Hui Ding Bing zhu wen Meng Qing-Song Ding Fan Zhang Department of Emergency Affiliated Hangzhou First People’s HospitalZhejiang University School of MedicineHangzhou 310006ZhejiangChina Department of Cardiothoracic Surgery The Third Affiliated Hospital of Qiqihar Medical CollegeQiqihar 161000HeilongjiangChina Department of Cardiothoracic Surgery The Affiliated Heilongjiang Provincial Hospital of Harbin Institute of TechnologyHarbin 150036HeilongjiangChina

Objective:To determine the inhibitory effects of pachymic acid on lung adenocarcinoma(LUAD)cells and elucidate its underlying ***:CCK-8,wound healing,Transwell,Western blot,tube formation,and immunofluorescence assays were carried out to measure the effects of various concentrations of pachymic acid on LUAD cell proliferation,metastasis,angiogenesis as well as ***,molecular docking technology was used to detect the potential targeted binding association between pachymic acid and protein tyrosine phosphatase 1B(PTP1B).Moreover,PTP1B was overexpressed in A549 cells to detect the specific mechanisms of pachymic ***:Pachymic acid suppressed LUAD cell viability,metastasis as well as angiogenesis while inducing cell *** also targeted PTP1B and lowered PTP1B ***,PTP1B overexpression reversed the effects of pachymic acid on metastasis,angiogenesis,and autophagy as well as the expression of Wnt3a andβ-catenin in LUAD ***:Pachymic acid inhibits metastasis and angiogenesis,and promotes autophagy in LUAD cells by modulating the Wnt/β-catenin signaling pathway via targeting PTP1B.

关键词： Pachymic acid Lung adenocarcinoma Protein tyrosine phosphatase 1B Wnt/β-catenin signaling pathway Metastasis Angiogenesis Autophagy

CdS/LaFeO_(3) heterojunctions with improved optical properties for visible-light catalytic applications

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 Rare Earths 2024年第5期42卷 879-888,I0003页

作者： Jiaqi Wei wen zhu Xuelian Xu Xiao Xu Junjiang zhu Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile University ChemistryWuhan430200China

Construction of heterojunctions is a normal and effective strategy to improve the photocatalytic performances of semiconductors,through which both the lifetime and the redox ability of electrons/holes can be improved,as co mpared to the respective *** this basis,we constructed Z-scheme CdS/LaFeO_(3) heterojunctions(CdS/LFO),by in-situ growing different amounts of CdS on the surface of LaFeO_(3),for photocatalytic degradation of tetracycline hydrochloride(TC)in aqueous solution at room *** crystal structure,surface morphology and optoelectronic properties of the COS/LFO heterojunctions were systemically characterized to correlate the reaction *** tests indicate that the CdS/LFO heterojunctions exhibit promising activity for TC degradation under visible light irradiation(λ≥420 nm),with 85%TC conversion obtained at reaction time of 45 min,which is 3.4 and 1.9 times higher than that of CdS and LaFeO_(3).The CdS/LFO heterojunctions are also stable in the reaction and can be reused for four cycles with no appreciable activity *** applicability of CdS/LFO to photocatalytic degradation of organic dyes,as well as the reaction mechanism,was also explored.

关键词： LaFeO_(3) CdS Photocatalytic degradation Tetracycline hydrochloride Reaction mechanism Rare earths

Polarization engineering in porous organic polymers for charge separation efficiency and its applications in photocatalytic aerobic oxidations

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 1000-1007页

作者： kun Wu Pei-wen Cheng Xin-Yi Liu Ji Zheng Xiao-Wei zhu Mo Xie Puxin weng Weigang Lu Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China Guangdong Rare Earth Photofunctional Materials Engineering Technology Research Center School of Chemistry and EnvironmentJiaying UniversityMeizhou 514015China

Photocatalytic aerobic oxidation reactions are largely governed by the efficiency of charge separation and subsequent reactive oxygen species(ROS) generation. Herein, we report a polarization engineering strategy to promote the charge separation and ROS generation efficiency by substituting the benzene unit with furan/thiophene in porous organic polymers(POPs). Benefiting from the extent of local polarization, the thiophene-containing POP(JNU-218) exhibits the best photocatalytic performance in aerobic oxidation reactions, with a yield much higher than those for the furan-containing POP(JNU-217) and the benzenecontaining POP(JNU-216). Experimental studies and theoretical calculations reveal that the increase of local polarization can indeed reduce the exciton binding energy, and therefore facilitate the separation of electron-hole pairs. This work demonstrates a viable strategy to tune charge separation and ROS generation efficiency by modulating the dipole moments of the building blocks in porous polymeric organic semiconductors.

关键词： porous organic polymer local polarization photocatalytic aerobic oxidation charge separation reactive oxygen species exciton binding energy

Effects of Interaction between Axial and Radial Secondary Air and Reductive Intensity in Reduction Region on Combustion Characteristics and NO_(x) Emission of Coal Preheated by a Self-Preheating Burner

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第1期33卷 249-267页

作者： SU kun DING Hongliang OUYANG Ziqu ZHANG Jinyang zhu Shujun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China

The study focused on the effects of the interaction between axial and radial secondary air and the reductive intensity in reduction region on combustion characteristics and NO_(x) emission in a 30 kW preheating combustion *** results revealed that the interaction and reductive intensity influenced the combustion in the down-fired combustor(DFC) and NO_(x) emission *** the temperature distribution,the interaction caused the position of the main combustion region to shift down as R_(2-12)(ratio of axial secondary air flow to radial secondary air flow) decreased or λ_(2)(total secondary air ratio) increased,and there was the interplay between both of their *** R_(3-12)(ratio of first-staged tertiary air flow to second-staged tertiary air flow)increased,the decrease in the reductive intensity also caused the above phenomenon,and the peak temperature increased in this *** the NO_(x) emission,the interaction affected the NO_(x) reduction adversely when λ_(2) or R_(2-12) was higher,and the range of this effect was larger,so that the NO_x emission increased obviously as they *** decrease in the reductive intensity caused the NO_(x) emission increased under the homogeneous reduction mechanism,while was unchanged at a high level under the heterogeneous reduction *** the combustion efficiency,the interaction improved the combustion efficiency as λ_(2) increased when R_(2-12) was lower,while reduced it as λ_(2) increased excessively when R_(2-12) was *** proper decrease in the reductive intensity caused the combustion efficiency increased obviously,while was hardly improved further when the intensity decreased *** this study,the lowest NO_(x) emission was only 41.75 mg/m^(3) without sacrificing the combustion efficiency by optimizing the interaction and reductive intensity.

关键词： self-preheating interaction of axial and radial secondary air reductive intensity combustion characteristic NO_(x)emission