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  • Trans Tech Publications, Ltd.  (30)
  • Zhang, Peng  (30)
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  • Trans Tech Publications, Ltd.  (30)
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  • 1
    Online Resource
    Online Resource
    Effect of Lubrication Conditions on the Forming Limit of Deep Drawing of 6061 Aluminum Alloy Sheet
    Trans Tech Publications, Ltd. ; 2019
    In:  Materials Science Forum Vol. 944 ( 2019-1), p. 85-91
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 944 ( 2019-1), p. 85-91
    Abstract: With the development of lightweight vehicles, aluminum alloy sheets are increasingly used in the automotive field. However, the aluminum alloy sheet has poor forming performance at room temperature. Therefore, how to improve the sheet metal forming performance of aluminum alloy sheet has become one of the current research hotspots. In this paper, the effects of different lubricants on the deep drawing forming properties of 6061 aluminum alloy sheets were studied by cupping experiments. The effects of lubricants on the deep drawing of sheet metal forming and the wall thickness of cups after deep drawing were explored. The results show that under the condition of drawing speed of 3MPa and 200mm/min, the ultimate drawing ratio of the sheet under oil lubrication is 1.92, and the PTFE film is 2.16. Grease and graphite lubrication are respectively 2.12 and 2.03, using PTFE film lubrication can increase by about 10% contrast with the oil lubrication. The measurement of the wall thickness of the cup under the forming limit state shows that the position with the largest reduction rate appears in the rounded transition zone, and the wall portion of the cylindrical member increases with the height of the wall, and the thickness from the bottom of the cup to the bottom of the cup. The edges all show a trend of decreasing first and then increasing.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.944
    DOI: 10.4028/www.scientific.net/MSF.944.85
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2019
    detail.hit.zdb_id: 2047372-2
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  • 2
    Online Resource
    Online Resource
    Preparation of a Novel Complex Antimicrobial Agent and its Antimicrobial Activity 〈i〉In Vitro〈/i〉
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 550-553 ( 2012-7), p. 1030-1038
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 550-553 ( 2012-7), p. 1030-1038
    Abstract: Purpose To develop a novel complex antimicrobial agent and determine the optimal components of the composite antimicrobial agents and its antimicrobial activity in vitro. Methods According to antimicrobial mechanisms，antibacterial spectrums，physical and chemical properties and applicabilities of existing antimicrobial agents in clinical use, select out cefoperazone sodium, sulbactam sodium and cephradine as the basic components to make a novel complex antimicrobial agent. Utilize yeast, staphylococcus aureus and E. coli bacteria as test bacteria. Do the three factors four-level orthogonal experiments by the maximum amount, the middle amount, low amount and Minimum amount of the three-component agent to research the optimum ratio of the drug. Measure the titer of the compound antimicrobial agent by the way of tube-plate method (2 doses). With known contents of Penicillin Sodium for Injection as control, and determine its minimum inhibitory concentration against staphylococcus aureus, E. coli and yeast by using the agar doubling dilution method. The experimental results were analysized by statistical analysis software SPSS16.0. Results The results of the three factors four-level orthogonal experiments indicate the optimum ratios of Cefoperazone Sodium, Sulbactam Sodium and Cephradine against E. coli, yeast and staphylococcus aureus were 2:2:3, 1:2:2 and 2:6:5, their titers were 1353.9U/mg, 982.7U/mg and 1015.5U/mg. With the highest titer proportion 2:2:3 as the composition of the antimicrobial compound. This compound antimicrobial agent had a good antimicrobial activity against Gram-positive bacteria, Gram-negative bacteria and Fungi, its minimal inhibitory concentration (MIC) against staphylococcus aureus, E. coli and yeast were 2.000μg/ml, 0.500μg/ml and 16.000μg/ml. Conclusion This research acquires a composite of antibiotics. This antimicrobial compound has a broader spectrum and higher antimicrobial activity in vitro comparing with traditional common single antibiotics, and it especially has a good antimicrobial activity against fungi. The results set a scientific foundation for enriching clinical medicines.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.550-553
    DOI: 10.4028/www.scientific.net/AMR.550-553.1030
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 3
    Online Resource
    Online Resource
    Preparation of Cortex Moutan Nanoparticles and its Microscopic Characteristics and Physicochemical Properties
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 528 ( 2012-6), p. 54-57
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 528 ( 2012-6), p. 54-57
    Abstract: Objective In order to increase the Paeonol dissolution and content, cortex moutan were smashed into nanoparticles, and the dissolution and content were compared by microscopy before and after super-micro-particle pulverization. Methods Super-micro-particle pulverization and general grinding were used to broke Cortex moutan into particles. The microscopic morphous characteristics of the before- and after- ultra-disintegration particles were compared by microscopy. Methods of HPLC was used to determine the content and dissolution of Paeonol with different grinding conditions. Methods of precipitation and funnel way were used to examine the stability and fluidity of cortex moutan nano-particles. Results Cortex moutan powder after super-micro-particle pulverization appears sphere or like-sphere, and its average size is 200nm~300nm. After the superfine grinding Paeonol dissolution increases 76.19% in comparison with without nano pulverization. The nanoparticle rest angle is θ=33°.The precipitation ratio of Cortex moutan powder with general grinding is 0.28 at 24h, and the precipitation ratio of its nano-power has been to 0.98 at 60min. Conclusion Paeonol dissolution, stability and fluidity of Cortex moutan nanoparticles were improved greatly and this nanoparticles is beneficial to industrial production for traditional Chinese medicine.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.528
    DOI: 10.4028/www.scientific.net/AMR.528.54
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    Preparation of Liuweidihuang Nano-Microcapsules and its Physicochemical Properties
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 528 ( 2012-6), p. 58-63
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 528 ( 2012-6), p. 58-63
    Abstract: To prepare out a novel preparation of liuweidihuang which effectively preserves Paeonol, Ursolic acid and Polysaccharides, and the preparation process should be scientific, lower-price and simple. The microscopic characteristics and its physicochemical properties of super-micro-particle of liuweidihuang from above process were also discussed. Methods According to the therapeutic and physicochemical properties of materials in liuweidihuang, the processed technology is as follow: Ripe rehmannia glutinosa,Tuckahoe and Alisma digitalis were boiled for 4.5h., the root bark of the peony tree(Paeonia suffruticosa), dogberry and yam were smashed to nanoparticles. Then select the reasonable method to drying the mixture. The microscopic shape characteristics of the before- and after- broken particles was compared. Paeonol content and dissolution were determined by HPLC. The stability and fluidity of liuweidihuang nanoparticles were examined by precipitation and funnel way. Results The approach of prepared liuweidihuang nano-microcapsules is scientific, lower-price and simple. The average size of processed super-micro-particle of liuweidihuang is 400±46nm. The hardness of the table is 9.7kg/cm2. The thickness of the table is 0.6cm. The friability of the tablet is ＜1%. Each tested item complied with standards of troches of Chinese medicine, and it is beneficial to industrial production for Chinese medicine.. Conclusion The nano-microcapsule is dispersive, desiccative, mobilizable, stable and three times concentrated than traditional pills of Liuweidihuang. It also can be used to produce different forms of drugs in the market.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.528
    DOI: 10.4028/www.scientific.net/AMR.528.58
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 5
    Online Resource
    Online Resource
    Preparation of 〈i〉Grifola frondosa〈/i〉 Fermented Beverage without Preservatives
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 554-556 ( 2012-7), p. 1110-1115
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 554-556 ( 2012-7), p. 1110-1115
    Abstract: Purpose To prepare Grifola frondosa fermented beverage and study on its production process, ingredients and characteristics. Methods The following process was used to prepare Grifola frondosa fermented beverage: Grifola frondosa original strains →Strain activation →Inclined plane strain →Liquid spawn →Submerged fermentation →Fermentation broth with mycelium →Colloid mill grinding →High pressure homogenization →Homogenate →Add preservatives or not →Package → Sterilizing or not →Finished product. Grifola frondosa mycelium biomass was determined by Weight-Drying method. Total sugar content was measured by Phenol-sulfuric acid method. Reducing sugar content was measured by 3, 5-dinitrosalicylic acid (DNS) method. Protein content was measured by Coomassie brilliant blue method. The quality of Grifola frondosa fermented beverage was evaluated every 10 days from six areas: color, precipitation, transparency, aroma, taste and the bacteria growth situation. Results Mycelia biomass of Grifola frondosa fermentation product is 378.3 ± 7.21mg/100ml. The total sugar content is 1.8995 mg/ml, the reducing sugar content is 0.2539 mg/ml, and grifolan content is 1.6456 mg/ml, protein content 7.971μg/ml. The total number of colonies is 67 CFU/ml and no E. coli in Grifola frondosa fermented beverage, this comply with the requirements of the national food safety standard. The samples of Grifola frondosa fermented beverage without sterilized and preservatives placed at room temperature for 6 months are normal, and no bacteria growth. Conclusion The production process of Grifola frondosa fermented beverage is feasible. In the case without sterilization and preservatives, Grifola frondosa fermented beverage can be placed at room temperature for 6 months without deterioration and still maintain its characteristics of nutrient-rich, pure taste, clean and hygienic, with natural mushroom fragrant. This can provide a reference for the development of Grifola frondosa submerged fermentation products.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.554-556
    DOI: 10.4028/www.scientific.net/AMR.554-556.1110
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
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  • 6
    Online Resource
    Online Resource
    The Purification of Grifolan Synthase and the Determination of its Molecular Weight
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 550-553 ( 2012-7), p. 1222-1228
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 550-553 ( 2012-7), p. 1222-1228
    Abstract: Purpose To search for a purification method of Grifolan Synthase crude extract from the mycelium of Grifola frondosa and determine its molecular weight. Methods Grifolan Synthase crude extract from the mycelium of Grifola frondosa was purified by recrystallization and native-PAGE. The process is as follows: Grifolan Synthase crude extract was dissolved in buffer solution (pH7.0). 10ml Grifolan Synthase crude extract solution was mixed with ammonium sulfate slowly to the concentration of 60%, and then mixed with 3ml cooling acetone (refrigeration at -18 °C for 12 hours) slowly, after standing for 24 hours, centrifugated at 5000rpm for 10 minutes at 4°C. Material at the interface was collected and air-dried as higher purity Grifolan Synthase. The higher purity Grifolan Synthase was dispersed in the native-PAGE gel, and the active band of native-PAGE gel was cut down and broken by ultrasonic treatment for 1min, then centrifugated at 5000rpm for 10 minutes at 4°C, the supernatant was taken and mixed with ammonium sulfate slowly to the concentration of 60%, after 24 hours on standing, centrifugated at 12000rpm for 10 minutes at 4°C, the pellets was got and the purity was checked by SDS-PAGE. The molecular weight of Grifolan Synthase was determined by SDS polyacrylamide gel electrophoresis (SDS-PAGE). Results Grifolan Synthase purified by recrystallization and native-PAGE was checked to be a single band by SDS-PAGE. The data of molecular weight obtained by SDS-PAGE showed that the molecular weight of Grifolan Synthase was 55000Da. Conclusion A purification method of Grifolan Synthase crude extract from the mycelium of Grifola frondosa was researched out, and the molecular weight of grifolan synthase was studied in this paper. It can lay the foundation for the further study on the structure and function of Grifolan Synthase.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.550-553
    DOI: 10.4028/www.scientific.net/AMR.550-553.1222
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
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  • 7
    Online Resource
    Online Resource
    Design and Implementation of Intermediate Frequency Generation and Analysis Module for Avionics Test
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 1049-1050 ( 2014-10), p. 1147-1153
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1049-1050 ( 2014-10), p. 1147-1153
    Abstract: To test airborne avionics device, it is necessary to provide signal stimulus for the device under test (DUT) to simulate the real work environment. This paper proposes a hardware module which used to signal generate and analyze. The hardware structure and diagram of logic design are described. The generated waveforms and measurement results are presented. This test module combined with other necessary modules can achieve the test of L band airborne avionics such as ATC, TCAS and TACAN.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1049-1050
    DOI: 10.4028/www.scientific.net/AMR.1049-1050.1147
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
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  • 8
    Online Resource
    Online Resource
    Research of Electric Properties of Monocrystalline Silicon Solar Battery
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 427 ( 2012-1), p. 128-132
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 427 ( 2012-1), p. 128-132
    Abstract: With crystalline silicon solar battery industry is developing rapidly, there are scientific significance and application value for guiding the industrial production using analysis of the electrical properties of crystalline silicon solar battery. This paper studies that the main parameters of monocrystalline crystal silicon solar battery: the junction depth and superficial concentrations influence on electrical characteristics of monocrystalline silicon solar battery. The result shows that for maximum efficiency, it is bound to get the largest possible open circuit voltage, short circuit current and fill factor of the product, therefore, it is necessary to control the junction depth and doping parameters. If the junction depth is constant, with the increased superficial doping concentration of monocrystalline silicon solar battery, the photoelectric conversion efficiency of the battery increases slowly at first and then rapidly decreases, and the deeper the junction depth is, the more obvious trend of the photoelectric conversion efficiency is. If the superficial doping concentration is constant, the photoelectric conversion efficiency of the battery is increased with the reductive junction depth of surface of monocrystalline silicon solar battery.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.427
    DOI: 10.4028/www.scientific.net/AMR.427.128
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 9
    Online Resource
    Online Resource
    Preparation of CuO/γ-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Catalysts by Impregnationin Supercritical CO〈sub〉2〈/sub〉
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 396-398 ( 2011-11-22), p. 1313-1317
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 396-398 ( 2011-11-22), p. 1313-1317
    Abstract: CuO/γ-Al2O3 catalysts were prepared by supercritical CO2 (SC-CO2) impregnation method. The preparation was carried out in SC-CO2 with Cu(NO3)2 as precursor, methanol as assistant solvent, and γ-Al2O3 as support. The effects of impregnation parameters such as temperature and pressure of SC-CO2, impregnation time, ratio of precursor to support, and amount of assistant solvent on catalyst preparation were investigated. The as-prepared catalysts were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis and compared to that prepared by the conventional impregnation method. The SC-CO2 impregnation method provided higher adsorption rate, larger adsorption quantity, more homogeneous dispersion of precursor, and stronger interaction between precursor and support. The catalytic degradation of methylene blue (MB) was used as probe reaction to estimate the catalytic activity of two catalysts prepared by two methods. The catalyst prepared by SC-CO2 impregnation method exhibits significantly improved catalytic activity. These results show that the inorganic metallic reagents as precursor with assistant solvent can be used as an alternative for the organometallic precursors in SC-CO2 impregnation method.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.396-398
    DOI: 10.4028/www.scientific.net/AMR.396-398.1313
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2265002-7
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  • 10
    Online Resource
    Online Resource
    Spatiotemporal Distribution of Rainfall Erosivity in the Bailong River Basin, Gansu Province
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 936 ( 2014-6), p. 2377-2382
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 936 ( 2014-6), p. 2377-2382
    Abstract: Rainfall erosivity is one of the key parameters that determine soil erosion, sediment yield, and water quality, thus its importance has grown in modeling of the environmental effects of climate change. The spatial and temporal distribution of rainfall erosivity in the Bailong River Basin in China's Gansu Province were analyzed. We derived a rainfall erosivity map based on data from 18 meteorological stations in and around the basin using the inverse distance weighting interpolation approach. The annual mean rainfall erosivity within the Bailong River Basin was 798.8 MJ mm ha -1 h -1 yr -1 . The mean annual amount of erosive rainfall accounts for 36.0 to 47.1% of annual precipitation, depending on the station. Rainfall erosivity was greatest from June to September, and rainfall during this period accounts for 77.7% to 84.8% of the total annual rainfall erosivity.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.936
    DOI: 10.4028/www.scientific.net/AMR.936.2377
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
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