检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2022年第12期52卷 37-44页

作者： Wenbo Yang Qingyun Li Shiqi Guo Shijie Sun Aixing Tang Haibo liu Youyan liu School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Guangxi Key Laboratory of Biorefining Nanning 530003China

Anthraquinone dyes are a class of typical carcinogenic and hard-biodegradable organic *** study aimed to enhance the decolorization of anthraquinone dye by rationally designing an expected immobilized *** blue 4(RB4) was used as a substrate model and a previous isolated dyedegrading strain Aspergillus flavus A5pl was purposefully *** the effects of cell attachment and mass transfer,the polyurethane foam(PUF) with open pore structure was selected as the immobilization *** showed that the RB4 decolorization efficiency was significant enhanced after *** to the free mycelium system,the decolorization time of200 mg·L^(-1)RB4 was shortened from 48 h to 28 h by the PUF-immobilized cell ***,the PUF-immobilized system could tolerate RB4 up to 2000 mg-L^(-1).In the packed bed bioreactor(PBBR),an average decolorization efficiency of 93.3% could be maintained by the PUF-immobilized system for26 *** decolorization process of RB4 was well described by the logistic equation and the degradation pathway was *** was found that the higher specific growth rate of the PUF-immobilized cells was one of reasons for the enhanced *** good performance of the PUFimmobilized cell system would make it have potential application value for RB4 bioremediation.

关键词： Aspergillus flavus A5p1 Reactive blue 4(RB4) Polyurethane foam(PUF) Immobilized cell Decolorization

WC/Co_(7)Fe_(3)heterojunction embedded in N,P co-doped hierarchical carbon enables rechargeable/flexible Zn-air battery

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 2519-2527页

作者： Huimin Mao Xiaobin liu Siqi Wu Yixin Fu Guishan liu Guizhong Zhou Lei Wang Key Laboratory of Eco-chemical Engineering International Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingQingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Chaofeng Steel Structure Group Co. Ltd.Hangzhou 311215China

Rational design and synthesis of bifunctional oxygen electrocatalysts with high activity and stability are key challenges in the development of rechargeable Zn-air batteries(ZABs).In this paper,tungsten carbide(WC)and Co_(7)Fe_(3)embedded in N,P co-doped hierarchical carbon(WC/Co_(7)Fe_(3)-NPHC)was prepared by using zeolite imidazolate frameworks as *** functional theory demonstrates that the mutual adjustment among the WC,Co_(7)Fe_(3),and N,P co-doped carbon at the three-phase heterojunction interface makes the catalyst possess moderate adsorption strength,and greatly improves the conductivity and electron transfer rate of the *** a result,the WC/Co_(7)Fe_(3)-NPHC exhibits a low overall oxygen redox potential difference of 0.72 V,while the ZAB assembled by WC/Co_(7)Fe_(3)-NPHC as an air cathode exhibits ultra-long cycle stability of over 550 ***,WC/Co_(7)Fe_(3)-NPHC can keep good charge and discharge stability at different bending angles when applied to flexible solid ZAB.

关键词： heterojunction hierarchical structure bifunctional oxygen electrocatalyst Zn-air battery

Oxidation Behavior of K4750 Alloy at Temperatures Between 750°C and 1000°C

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

Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1657-1668页

作者： Yan-Li liu Kun-Lei Hou Mei-Qiong Ou Ying-Che Ma Kui liu School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

This study investigated the oxidation behavior of a new casting Ni-based superalloy K4750 at 750°C-1000°C in air for 100 h-1000 h by isothermal oxidation *** oxidation-kinetic curves were plotted by the static discontinuous weight gain *** and identification of oxidation products were conducted using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),electron probe micro-analysis(EPMA)and X-ray diffraction(XRD).X-ray photoelectron spectrometer(XPS)was also used to analyze the chemical state of elements and the distribution in *** results showed that the oxidation-kinetic curves of K4750 alloy basically obeyed the parabolic *** average oxidation rate below 900°C was less than 0.1 g/m 2·h which meant the alloy was at a complete anti-oxidation grade,and the alloy was at an anti-oxidation grade at 1000°*** predominant surface oxide was Cr_(2)O_(3),and a double layer structure of the oxide scale was observed at all tested temperatures as time *** outer oxide layer contained continuous Cr_(2)O_(3)and a small amount of oxides mixed TiO2 and NiCr2O4,while the inner oxide layer was composed with Al_(2)O_(3).The oxidation process could be interpreted by the competitive oxidation of different *** diffusion rate of Ti through Cr_(2)O_(3)layer increased with increasing temperature,and thus the generation of TiO2 was *** dispersed TiO2 reaching a certain amount destroyed the continuity of the surface oxide layer,which accounted for the reduction of oxidation resistance of K4750 alloy at high temperatures.

关键词： Ni-based superalloy Oxidation Titanium Internal oxides

An examination of summer precipitation over Asia based on TRMM/TMI

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第3期50卷 430-441页

作者： liu Qi FU Yunfei School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

A 6-year dataset of summer monthly mean precipitation derived from Tropical Precipitation Measure-ment Mission (TRMM)-Microwave Imager (TMI) was used to delineate the spatial distribution patterns of precipitation throughout Asian areas, which indicates that there are three rainfall centers located at the northern coast of the Bay of Bengal, the South China Sea and the western equatorial Pacific Warm Pool, respectively. Based upon the analysis of horizontal distribution, the capability of TMI for characterizing terrestrial and maritime precipitation has been evaluated and compared with Global Precipitation Climatology Project (GPCP) dataset. It was found that TMI and GPCP are well consistent with each other, while a few significant differences occur at several regions over land. By investigating rainfall esti-mates over six specific locations in Asia, a systematic underestimation of TMI was demonstrated, which could be explained by the inherent deficiency within TMI terrestrial algorithm relying on scat-tering signal from ice particles in a precipitation system. A further analysis shows that the highly in-homogeneous distribution of rain gauges employed by GPCP contributes a great deal to the significant discrepancy between GPCP and TMI, especially over regions surrounding the Tibetan Plateau where rain gauges are quite scarce.

关键词： TRMM TMI GPCP precipitation discrepancy hydrometeor profiles

Self-assembly behavior of phenyl modified β-cyclodextrins

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2006年第3期49卷 230-237页

作者： ZHAO Yanli liu Yu Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

The self-assembly behavior of mono(6-phenolic-6-deoxy)-β-cyclodextrin bothin solution and the solid state is comparatively studied by X-ray crystallography and ~1H NMRspectroscopy. The results obtained show that the phenolic groups in the crystal 1 can successivelypenetrate into the adjacent β-cyclodextrin cavities from the secondary side to form head-to-taillinear polymeric su-pramolecule with a 2-fold screw axis. The self-assembly behavior also can bedetermined in D_2O solution, giving a self-association constant of 240 mol^(-1)·L. Using thepresent and previous structures reported for the relevant β-cyclodextrin derivatives, i.e.,mono(6-anilino-6-deoxy)-β-cyclodextrin, mono(6-phenylselenyl-6-deoxy)-β-cyclodextrin, andmono(6-phenylthio-6-deoxy)-β-cyclodextrin, we further reveal the factors governing the formationsof supramolecular assemblies.

关键词： crystal structure, cyclodextrin, pivot atoms, self-assembly, supramolecule.

A Numerical Modelling Method of Fractured Reservoirs with Embedded Meshes and Topological Fracture Projection Configurations

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第6期131卷 1403-1429页

作者： Xiang Rao Yina liu Cooperative Innovation Center of Unconventional Oil and Gas(Ministry of Education&Hubei Province) Yangtze UniversityWuhanChina School of Petroleum Engineering Yangtze UniversityWuhanChina

Projection-based embedded discrete fracture model(pEDFM)is an effective numerical model to handle the flow in fractured reservoirs,with high efficiency and strong generalization of flow ***,this paper points out that pEDFM fails to handle flow barriers in most cases,and identifies the physical projection configuration of fractures is a key step in *** paper presents and proves the equivalence theorem,which explains the geometric nature of physical projection configurations of fractures,that is,the projection configuration of a fracture being physical is equivalent to it being topologically homeomorphic to the fracture,by analyzing the essence of *** projection configurations of fractures may be rigorously established based on this theorem,allowing pEDFM to obtain physical numerical results for many flow models,particularly those with flow ***,a natural idea emerges of employing flow barriers to flexibly‘cut’the formation to quickly handle the flow problems in the formation with complex geological conditions,and several numerical examples are implemented to test this idea and application of the improved pEDFM.

关键词： Numerical modeling method fractured reservoirs fracture-projection configuration flow barriers topologically homeomorphism

Regression Method for Rail Fastener Tightness Based on Center-Line Projection Distance Feature and Neural Network

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

Chinese Journal of Mechanical Engineering 2024年第2期37卷 356-371页

作者： Yuanhang Wang Duxin liu Sheng Guo Yifan Wu Jing liu Wei Li Hongjie Wang Robotics Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Construction Industrial&Energy Engineering Group Co. Ltd.Nanjing 210023China

In the railway system,fasteners have the functions of damping,maintaining the track distance,and adjusting the track ***,routine maintenance and inspection of fasteners are important to ensure the safe operation of track ***,assessment methods for fastener tightness include manual observation,acoustic wave detection,and image *** are limitations such as low accuracy and efficiency,easy interference and misjudgment,and a lack of accurate,stable,and fast detection *** at the small deformation characteristics and large elastic change of fasteners from full loosening to full tightening,this study proposes high-precision surface-structured light technology for fastener detection and fastener deformation feature extraction based on the center-line projection distance and a fastener tightness regression method based on neural ***,the method uses a 3D camera to obtain a fastener point cloud and then segments the elastic rod area based on the iterative closest point algorithm *** component analysis is used to calculate the normal vector of the segmented elastic rod surface and extract the point on the centerline of the elastic *** point is projected onto the upper surface of the bolt to calculate the projection ***,the mapping relationship between the projection distance sequence and fastener tightness is established,and the influence of each parameter on the fastener tightness prediction is ***,by setting up a fastener detection scene in the track experimental base,collecting data,and completing the algorithm verification,the results showed that the deviation between the fastener tightness regression value obtained after the algorithm processing and the actual measured value RMSE was 0.2196 mm,which significantly improved the effect compared with other tightness detection methods,and realized an effective fastener tightness regression.

关键词： Railway system Fasteners Tightness inspection Neural network regression 3D point cloud processing

Construction of the Inference Engine of Blast Furnace Expert System

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 1998年第2期5卷 24-29页

作者： liu Jinkun Wang Shuqing State Key Laboratory of CAD & CG Zhejiang University

The expert system for judging blast furnace condition is built to realize automatic judgment of blast furnace conditions and standardization of blast furnace operation. This paper discusses the design and implementati... 详细信息

关键词： blast furnace expert system inference engine

同方期刊数据库

A matrix operator approach to a risk model with two classes of claims

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2012年第3期7卷 437-448页

作者： Hua DONG Zaiming liu School of Mathematics Qufu Normal UniversityQufu 273165China School of Mathematics Central South UniversityChangsha 410075China

In this paper, we study a risk model with two independent classes of risks, in which both claim number processes are renewal processes with phasetype inter-arrival times. Using a generalized matrix Dickson-Hipp operator, a matrix Volterra integral equation for the Gerber-Shiu function is derived. And the analytical solution to the Gerber-Shiu function is also provided.

关键词： Gerber-Shiu function phase-type distribution Dickson-Hippoperator

The carotenoid characteristics of the important wild shrimp Trachysalambria curvirostris(Stimpson,1860) in China

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 Oceanology and Limnology 2019年第2期37卷 706-712页

作者： SU Fang liu Jianguo CAS Key Laboratory of Experimental Marine Biology Center for Ocean Mega-Science Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China

Trachysalambria curvirostris is an economically important shrimp in the coastal waters of the Western Indo-Pacific. However, there is no information about its carotenoid composition and distribution. The carotenoid profiles including concentration, composition, molecular forms (free or esterified) and configuration (geometrical and optical isomers) of raw and dried T. curvirostris (Stimpson, 1860) were qualitatively and quantitatively assessed. In the raw shrimp, astaxanthin and β-carotene were the two dominant carotenoids, which contributed 75.18%–88.86% and 2.86%–16.83% of the total carotenoid content. Traces of echinenone, canthaxanthin and astacene were also detected. The carotenoid content in the waste (80.28 mg/kg dry weight) was nearly two-fold higher than that in the meat (49.69 mg/kg dry weight). Of the total astaxanthin in these shrimp, 85.18%–90.59% was esterified. All- trans astaxanthin was the predominant geometrical isomer followed by 13- cis , 9- cis , di- cis and 15- cis isomers. A mix of three stereoisomers was found in all parts and the percentages of meso (3 S , 3’ R ) and (3 S , 3’ S ) forms were significantly higher than the (3 R , 3’ R ) isomer. Compared to the carotenoid content of the raw shrimp, only 26.17 mg/kg remained in the dried shrimp. Nearly half of the carotenoids were lost during the drying process. Substantial hydrolysis and isomerization also occurred.

关键词： Trachysalambria curvirostris carotenoids astaxanthin dried shrimp