检索结果-南通市图书馆

Effect of Plastocene Embedment in the Microperforated Plate on Its AcousticPerformance

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第5期9卷 923-941页

作者： Yipu wang yonghua wang Zheming Liu Huadong Yu Jinkai Xu Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun130022China Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchun130025China

Noise pollution is one of the contemporary environmental pollution, which seriously damages people’s green andhealthy life. In order to further improve the low frequency sound absorption performance of microperforatedpanel (MPP), a new plastocene coupled microperforated plate (PCMPP) is proposed. The acoustic propertiesof PCMPP with different apertures and perforation ratio were measured by transfer function method and compared with that of conventional MPPs. It is found that when the aperture was 0.8 mm, the peak value of soundabsorption coefficient of PCMPP decreased by 150 Hz compared with MPP. In a certain range, PCMPP with larger apertures showed a greater influence on sound absorption property in low frequency. In addition, higher perforation ratio led to a greater PCMPP bandwidth of sound absorption. On the other hand, the effect of PCMPPwith aperture of 0.2 mm on the performance of MPP was reduced, which could be compensated by increasing theperforation ratio. Furthermore, we found that the effect of aperture, perforation ratio and cavity on the soundabsorption performance of PCMPP was consistent with that of ideal rigid MPP. The step cooling curve showedthat the plastocene began to soften at about 50℃, representing a great potential for a non-high temperaturework environment.

关键词： Noise pollution plastocene coupled microperforated panel transfer function method sound absorption coefficient

Performance of cryogenic regenerator with ~3 He as working fluid

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 Science Bulletin 2011年第16期56卷 1732-1738页

作者： HUANG yonghua FANG Lei wang RuZhu Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200240 China

Almost all experimental and theoretical studies on regenerative cryocoolers at temperatures below 20 K mention the use of 4He as working fluid.A preliminary qualitative evaluation indicates that because of the superfluid phase transition,a working fluid of 3 He would overcome the cooling temperature limitation set by *** with a comparison of the thermophysical properties of 3He and 4He,cryogenic regenerator simulations applied to the third/last stage of a pulse tube refrigerator,with 3He and 4He separately,were implemented to quantitatively analyze performance differences of the regenerator with respect to regenerator loss, cooling power and *** conclude that 3He could significantly improve the performance of a regenerative cryocooler.

关键词：蓄热性能工作液低温脉冲管制冷机冷却温度热物理性能定性评价工作流体

Steep subduction of the Indian continental mantle lithosphere beneath the eastern Himalaya revealed by gravity anomalies

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2023年第9期66卷 1994-2010页

作者： Shengxian LIANG Xuben wang Zhengwei XU Yanpei DAI yonghua wang Jing GUO Yanjie JIAO Fu LI Key Laboratory of Earth Exploration and Information Technique Chengdu University of TechnologyChengdu 610059China Chengdu Center China Geological SurveyChengdu 610081China

The geometry and deformation of the Indian continental mantle lithosphere(ICML)beneath the India-Eurasia collision zone are critical to understanding the accommodation of continent-continent *** this paper,the distribution of residual gravity anomalies in the upper mantle of southern Tibet is estimated using the gravity data and seismic velocity models,and the heterogeneous density distribution of the upper-mantle is then recovered through three-dimensional gravity *** results reveal a low-density anomaly(~300 km W-E and~100 km N-S)in the upper mantle under the eastern Himalaya,while there is no obvious density anomaly under the western *** western boundary of the low-density anomaly coincides with the Yadong-Gulu Rift(YGR)on the surface(89°–90°E),and its southern boundary is located at~28°N,approximately 130 km southward from the Indus-Yarlung suture,probably representing the mantle suture at *** observation indicates that,in contrast to the western ICML which is probably underthrusting at a shallow angle,the eastern ICML be likely subducting steeply,accompanying asthenosphere *** a laterally varying geometry suggests that a major tearing of the ICML may have taken place from the intersection of the mantle suture and the YGR in the upper *** tearing and the steep subduction of the ICML might be associated with the magmatic and mineralization events in the eastern Himalaya-Gangdese and the formation of the YGR.

关键词： Indian continental mantle lithosphere Steep subduction Mantle suture Major tearing point Upper mantle density Himalaya

同方期刊数据库

A novel insight of enhancing the hydrogen peroxide tolerance of unspecific peroxygenase from Daldinia caldariorum based on structure

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 426-430页

作者： Tiantian Li Ruochen Jin Bin Wu Dongming Lan Yunjian Ma yonghua wang School of Food Science and Engineering South China University of TechnologyGuangzhou 510640China School of Bioscience and Bioengineering South China University of TechnologyGuangzhou 510006China Guangdong Youmei Institute of Intelligent Bio-manufacturing Co. Ltd.Foshan 528200China

Unspecific peroxygenases(UPOs, EC 1.***.2.1) is a kind of thioheme enzyme capable of catalyzing various oxidations of inert C–H bonds using H_(2)O_(2) as an oxygen donor without cofactors. However, the enhancement of the H_(2)O_(2) tolerance of UPOs is always challenging. In this study, the A161C mutant of r Dca UPO,which originates from Daldinia caldariorum, was found to be highly H_(2)O_(2)-resistant. Compared with the wild type, the mutant r Dca UPO-A161C showed a 10-h prolonged half-life and a 64% improved enzyme activity when incubated in 10 mmol/L H_(2)O_(2). The crystal structure analysis at 1.47 A showed that r Dca UPOA161C exhibited 10 α-helixes(cyan) and a series of ordered rings, forming a single asymmetric spherical structure. The two conserved domains near heme formed an active site with the catalytic PCP and EHD regions(Glu86, His87, Asp88 residues). The H_(2)O_(2) tolerance of r Dca UPO-A161C was preliminarily explored by comparing its structure with the wild type. Notably, r Dca UPO-A161C showed significantly higher catalytic efficiency than the wild type for the production of hydroxyl fatty acids. This study is anticipated to provide an insight into the structure-function relationship and expand potential applications of UPOs.

关键词： Unspecific peroxygenase Molecular modification Hydrogen peroxide stability Crystal structure Hydroxyl fatty acids

The in vitro digestion fates of diacylglycerol under different intestinal conditions:a potential lipid source for lipid indigestion patients

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第2期13卷 1079-1092页

作者： Qingqing Xu Weifei wang Dongxiao Sun-Waterhouse Qian Zou Menglei Yan Xuan Liu Dongming Lan yonghua wang School of Food Science and Engineering South China University of TechnologyGuangzhou 510640China Sericultural and Agri-Food Research Institute Guangdong Academy of Agricultural SciencesGuangzhou 510610China School of Chemical Sciences The University of AucklandPrivate Bag 92019New Zealand Guangdong Youmei Institute of Intelligent Bio-manufacturing Co. Ltd.Foshan 528200China

The in vitro digestion models mimicking the gastrointestinal(GI)tract of general population and lipid indigestion patients(with lower levels of bile salts or pancreatic lipase)were selected to investigate whether diacylglycerols(DAGs)are potential good lipid sources for these *** oil-based DAG(LD)and linseed oil(LT)were ***-based emulsion((83.74±1.23)%)had higher lipolysis degree than LT-based emulsion((74.47±1.16)%)when monitoring the GI tract of normal population as previously *** conditions seriously decreased the digestive degree of LT-based emulsion((40.23±2.48)%-(66.50±3.70)%)while showed less influence on LD-based emulsion((64.18±2.41)%-(81.85±3.45)%).As opposed to LT-based emulsion,LD-based emulsion exhibited preference for releasing unsaturated fatty acids(especially oleic acid andα-linolenic acid)due to their different glycerolipid ***-based emulsion showed potential for providing lipids and nutrients(including essential fatty acids)for lipid indigestion patients.

关键词： Diacylglycerol In vitro digestion Lipolysis level Cholestatic Exocrine pancreatic insufficiency

Transgenic analyses of TGIF family proteins in Drosophila imply their role in cell growth

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2008年第8期35卷 457-465页

作者： yonghua wang Lixia wang Zhaohui wang Key Laboratory of Molecular and Developmental Biology Institute of Genetics and Developmental Biology Chinese AcademY of Sciences Beijing 100101 China Graduate School Chinese Academy of Sciences Beijing 100049 China

TG-interacting factors （TGIFs） belong to a family of TALE-homeodomain proteins including TGIF, TGIF2, and TGIF2LX/Y （TGIF2 like on X or Y chromosome） in human. They potentially play important functions in various tissues during development. Mutations in TGIF are frequently associated with malformation of forebrain and facial structures; TGIF2 proteins are over-expressed in many ovarian cancer cell lines; and TGIF2LX/Y are specifically expressed in adult testis. The molecular functions of these proteins have been investigated mostly in cultured cells. TGIF and TGIF2 have been found as transcriptional repressors that modulate TGF-beta signaling. However these findings are far from sufficient to explain their mutant phenotypes or expression patterns, and the functions of TGIF2LX/Y have never been reported. Here we use Drosophila as a model system to explore the functions of TGIF family proteins in vivo. We observed in fly tissues such as fat body, epithelia, and neuronal cells, that expressing human TGIF2 or human TGIF2LX generally inhibited cell growth in size and number. Co-expressing Drosophila Myc, Cyclin E, or human c-MycS partially rescued the growth inhibition induced by human TGIFs, whereas activated insulin pathway signaling did not. Taken together, we provide in vivo evidence for the potential functions of human TGIF2 and TGIF2LX in growth control. Additionally, we confirmed that Drosophila TGIFs are transcriptional activators by assaying their activities in spermatogenesis.

关键词： TGIF cell size cell proliferation transgenic Drosophila melanogaster

Effects of PQQ on Protective System in Cucumber Cotyledons under Low Temperature Stress

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 1998年第2期3卷 235-238页

作者： Zhao Yongfang Liu Weiqun Zhu Yunji wang yonghua wang Guanfang Wuhan University College of Life Sciences Wuhan China (GRID:grid.49470.3e) (ISNI:***) Henan Agriculture University Zhengzhou China (GRID:grid.108266.b)

The authors have studied the effects of Pyrroioguinloine quinone (PQQ) on superoxide dismutase (SOD), Ascorbid acid(AsA) peroxidase (AsAPOD), glutathion (GSH) and electrolytic leakage of cotyledon in cucumber seedling under low temperature stress, meanwhile, 8-hydroquinone (8-HQ) and AsA (activeoxiygen scavengers) have been made use of in comparison with PQQ. The results indicate that the activities of SOD, AsAPOD and content of GSH can be increased by PQQ. The relative conductivity of cotyledon in cucumber seedling is decreased for PQQ possesses the ability of cleaning up free redical of oxygen. We came to the conclusion that PQQ can act as a kind of active oxygen scavenger and adjust the metabolism on free radical of oxygen to balance in plants and enhance resistance finally in plants.

关键词： pyrroloquinloine quinone (PQQ) protect system low temperatural stress cucumber seedling active oxygen scavenger

Metallogenic Prediction of the Peripheral Areas of the Xiyi Concealed Lead-Zinc Deposit in Baoshan City, Yunnan Province

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第5期89卷 1775-1776页

作者： WU Wenxian DING Jun wang yonghua MENG Fujun ASKAR DENG Ke Chengdu Center of China Geological Survey College of Earth Sciences Chengdu University of Technology Yunnan Exploration Institute of Geology and Mineral Resources

The newly-discovered Xiyi lead-zinc deposit is a large deposit located in the north central Baoshan block of the southern Sanjiang metallogenic belt section, Southwest *** surface of the deposit is mainly covered by eluvial-deluvial lateritic layer, without any mineralized outcrops. The main concealed orebody V3 is buffed in the depth of 300-500m. The orebodies are controlled by certain stratigraphic horizons, and most are cut by strata with a high angle, while a few occur along the strata. The direct wall rocks are calcisiltite, calclithite, bioclastic calcarenite,

关键词： Zn Metallogenic Prediction of the Peripheral Areas of the Xiyi Concealed Lead-Zinc Deposit in Baoshan City Yunnan Province AMT Pb

Research and application of the virtual simulation system teaching method in copper pyrometallurgy

在线全文

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2021年第1期12卷 15-28页

作者： Sijie Zhou Dongming Zeng Chong Yan Jiaqi Huang Shuai wang and yonghua Zhou School of Chemistry and Chemical Engineering Central South University ChangshaP.R.China

Copper pyrometallurgy has been holding a special place in the copper smelting ***,it is hard to explore the effect of parameters on production effectively due to the inoperable practice in the *** physical and chemical changes during the metallurgical process of copper smelting are also too complex to be ***,we designed and built a virtual factory for copper pyrometallurgy,copper pyrometallurgy virtual simulation system(CPVSS),to simulate the copper smelting *** entire technical routes,system function,the main productive principle,technological process,and conditional tests were fully simulated in the *** also provided a solution for the observation of internal phenomena in this ***,sample computations were provided in this paper to illustrate the parameter simulation of the smelting process.A novel interactive experimental model was also constructed with virtual simulation technology and network multimedia technology,which provides powerful support for copper pyrometallurgy learning.

关键词： Copper pyrometallurgy virtual system education