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Structural, Pasting, and Thermal Properties of Ultra-high Pressure-treated Lotus Seed Starch 被引量:3
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作者 郭泽镔 陈秉彦 +2 位作者 卢旭 曾绍校 郑宝东 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第4期647-653,共7页
Lotus seed starch (15%, w/w) was subjected to ultra-high pressure (UHP) at 500 MPa for 10~60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-stat... Lotus seed starch (15%, w/w) was subjected to ultra-high pressure (UHP) at 500 MPa for 10~60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-state 13C CP/MAS NMR, differential scanning calorimetry (DSC), HPSEC-MALLS-RI, and a rapid visco analyzer. The 13C CP/MAS NMR results revealed a reduction in the relative crystallinity and peak intensity of the crystalline state with increasing the UHP time. The molecular weight of native starch was 1.433 × 107 Da, which was higher than that of the UHP-treated starch. Viscograms of UHP-treated starch revealed an increase in paste viscosity, peak time, and pasting temperature and a reduction in breakdown and setback viscosity compared to the native starch. Furthermore, the DSC results showed a reduction in gelatinization temperature and gelatinization enthalpy with increasing the UHP time. 展开更多
关键词 lotus seed Starch ultra-high pressure molecular weights pasting properties thermal properties
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Effects of ultra-high hydrostatic pressure on foaming and physical-chemistry properties of egg white 被引量:1
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作者 Rui-Xiang Yang Wen-Zhao Li +1 位作者 Chun-Qiu Zhu Qiang Zhang 《Journal of Biomedical Science and Engineering》 2009年第8期617-620,共4页
The influences of ultra-high hydrostatic pressure treatment on foaming and physical properties (solubility, hydrophobicity and sulfhydryl content) of egg white were investigated. A pressure range of 0-500 MPa, time ra... The influences of ultra-high hydrostatic pressure treatment on foaming and physical properties (solubility, hydrophobicity and sulfhydryl content) of egg white were investigated. A pressure range of 0-500 MPa, time range of 0-20 min and pH range of 7.5-8.5 were selected. The foaming property of egg white is improved by 350Mpa and 10min. The treatment resulted in in- crease of sulfhydryl content of egg white, while solubility and hydrophobicity were significantly decreased. 展开更多
关键词 ultra-high HYDROSTATIC pressure EGG WHITE FOAMING PROPERTY
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Analysis on performance and test of a new type of ultra-high pressure pipe joint
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作者 Zhai Fugang Kong Xiangdong +2 位作者 Sun Yugang Wang Zhong Hao Xiaobei 《High Technology Letters》 EI CAS 2018年第2期203-207,共5页
Analysis as well as application of ultra-high pressure hydraulic system and elements has become a trend. The structure and operation principle of a new type of ultra-high pressure pipe joint is introduced. The structu... Analysis as well as application of ultra-high pressure hydraulic system and elements has become a trend. The structure and operation principle of a new type of ultra-high pressure pipe joint is introduced. The structure of the new type of ultra-high pressure pipe joint is simple and is easy to be produced. The finite element model on two working conditions( preload condition with 30 N·m torque and static-loading condition with 70 MPa pressure) is built and computed. The width of contact area,the equivalent stress status,as well as the contact pressure status are plotted and analyzed. According to the national standard,test on air-tightness,blasting,and cyclic endurance is conducted and the results show that the new type of ultra-high pressure pipe joint has the sealability for ultra-high pressure up to 70 MPa,and the DN6 ultra-high pressure pipe joint can provide effective seal under70 MPa fluid pressure. The research can provide a thinking and method on designing ultra-high pressure pipe joint and push forward the development of ultra-high pressure hydraulic system. 展开更多
关键词 pipe joint ultra-high pressure sealing performance hydraulic system
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Enzymatic Hydrolysis of Hairtail Surimi in an Ultra-High Pressure Bioreactor
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作者 Deqing Yang Rong Liu +2 位作者 Yongsheng Wang Minrui Ou Junjie Gu 《Advances in Biological Chemistry》 2019年第6期189-197,共9页
Amino acids have been extracted from Hairtail surimi using enzymes in an ultra-high pressure bioreactor. The extraction efficiency of different enzymes including papain, trypsin, and proteases (acid, neutral, alkaline... Amino acids have been extracted from Hairtail surimi using enzymes in an ultra-high pressure bioreactor. The extraction efficiency of different enzymes including papain, trypsin, and proteases (acid, neutral, alkaline) also has been evaluated, and it has been discovered that neutral protease behaved the best. The amino acids were analyzed using automatic amino acid analyzer, and the enzymatic digestion conditions were optimized. For neutral protease, the optimal condition was 50℃, 250 MPa, pH 7.0. Material to liquid ratio of enzyme is 6%. More than 29 amino acids were detected after 24 hours of hydrolysis;the enzymatic hydrolysis rate can reach 83.29%. The results show that enzymatic digestion under ultra-high-pressure provides a very promising approach to extract amino acids from Hairtail surimi. 展开更多
关键词 ENZYMATIC HYDROLYSIS ultra-high pressure HAIRTAIL SURIMI Amino ACIDS
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THERMAL MODELLING OF COLLISIONAL OROGENY: IMPLICATIONS FOR THE ULTRA-HIGH PRESSURE METAMORPHISM
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作者 WANG Yang (Division of Petrology, China University of Geosciences, Beijing 100083, China) 《Geotectonica et Metallogenia》 2001年第1期70-71,共2页
The petrological research on the ultra high pressure metamorphism (UHP) of collisional orogen indicates that the upper crustal rocks is subducted to depths exceeding 100 km, and returned to the surface rapidly. In thi... The petrological research on the ultra high pressure metamorphism (UHP) of collisional orogen indicates that the upper crustal rocks is subducted to depths exceeding 100 km, and returned to the surface rapidly. In this study, we investigate the thermal structure of collisional orogen as a slab of continental lithosphere being subducted beneath an overriding wedge of continental lithosphere by the 2 D finite element method. The advection heat transfer due to the accretion of orogenic wedge is considered. The wedge is composed of the upper crust materials through the accretion from the down going plate to the upper plate. For identifying the significance of the geometric and/or kinetic factors on the thermal structure of continental subduction, the different combinations of parameters, including dip angle of subduction zone, accretion or erosion rates, and the convergence velocity etc., are used in modelling. The time span of continental subduction in our calculation is less than 30 Ma, according to the short duration of ultra deep subduction of continental slab suggested by the preservation of metastable pre peak low pressure mineralogy assemblage in the garnet of UHP rocks. Therefore, the steep dip angle of down going plate and/or low rate of accretion favour the ultra deep subduction of upper crust materials, especially for the slower down going slab. Meanwhile, taking the erosion rate as the level of exhumation rate of UHP rocks in some orogens (i.e., 1-2 km/Ma or more) does not result in the anatexis melting of crust of the overriding plate, due to the cooling effect of the rapid down going slab. However, the temperature structures of all models are generally cooler than those recovered by thermobarometric studies of the UHP rocks. This implies the significant increase of temperature after the rapid subduction of continental slab. Following the method of Davies and von Blackenburg (1998), we show that the slab breakoff can occur at the depth exceeding 100 km. Thermal modelling on the post subduction stage shows the heating related to the plate breakoff can cause the higher temperature recorded by the exhumed UHP rocks. The higher geotherm during post subduction stage leads to the weak strength of the orogenic wedge, and favours the faster upward movement of the UHP rock slices as ductile agents. The lower temperature gradient of the subduction slab predicted by modelling suggests the cold subducting slab could have transported significant fluids to mantle depth, not released during subduction. Accordingly, the absence of coeval calc alkalic magmatism in UHP orogens might resulted from the lower temperature as well as the fluid free circumstance, both are related to the rapid subduction of cold plate. Therefore, shear heating is not needed for explanation the thermal evolution of UHP orogen. On the other hand, the post collisional or late stage granitic plutonism is closely related to the deep seated heat producing materials of the accretion wedge. 展开更多
关键词 UHP IMPLICATIONS FOR THE ultra-high pressure METAMORPHISM THERMAL MODELLING OF COLLISIONAL OROGENY
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Cyclic Pulsating Pressure Enhanced Segregating Structuration of Ultra-High Molecular Weight Polyethylene/Graphene Composites as High-performance Light-Weight EMI Shields
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作者 Yun-Zhi Huang Xiao-Xiao Liu +3 位作者 Lan-Wei Li Guang-Ming Huang Zhao-Xia Huang Jin-Ping Qu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第7期958-967,I0008,共11页
Currently,the enhancement in electromagnetic interference(EMI)performance of polymeric composite generally relies on either improving electrical conductivity(σ)for stronger electromagnetic(EM)reflections or tailoring... Currently,the enhancement in electromagnetic interference(EMI)performance of polymeric composite generally relies on either improving electrical conductivity(σ)for stronger electromagnetic(EM)reflections or tailoring structure for higher EM resonances.Herein,we proposed a novel technique called cyclic pulsating pressure enhanced segregating structuration(CPP-SS),which can reinforce these two factors simultaneously.The structural information was supplied by optical microscopy(OM)and scanning electron microscopy(SEM),both of which confirmed the formation and evolution of segregate structured ultra-high molecular weight polyethylene(UHMWPE)/graphene composites.Then,the result showed that CPP-SS can significantly improve theσof samples.Ultimately,advanced specific EMI shielding efficiency of 31.1 d B/mm was achieved for UHMWPE/graphene composite at 1-mm thickness and a low graphene loading of 5 wt%.Meanwhile,it also confirmed that the intrinsic disadvantage of poor mechanical properties of conventional segregated structure composites can be surpassed.This work is believed to provide a fundamental understanding of the structural and performance evolutions of segregated structured composites prepared under CPPSS,and to bring us a simple and efficient approach for fabricating high-performance,strong and light-weight polymeric EMI shields. 展开更多
关键词 Cyclic pulsating pressure Segregated structure ultra-high molecular weight polyethylene GRAPHENE Electromagnetic interface
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Polyarylacetylene as a novel graphitizable precursor for fabricating high-density C/C composite via ultra-high pressure impregnation and carbonization
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作者 Jiaxin Feng Ping Hu +7 位作者 Yuan Cheng Yiming Wang Nan Qu Lu Zheng Liancai Xun Chi Zhang Guangdong Zhao Xinghong Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第15期198-209,共12页
High-density carbon/carbon(C/C)composite plays a critical role in the aerospace industry owing to excellent mechanical properties and resistance to ablation.However,traditional manufacturing relies on pitch precursor ... High-density carbon/carbon(C/C)composite plays a critical role in the aerospace industry owing to excellent mechanical properties and resistance to ablation.However,traditional manufacturing relies on pitch precursor and hot isostatic pressure impregnation and carbonization(HIPIC)technology,which is time-consuming and expensive.In this study,we report an innovative method utilizing polyarylacetylene(PAA)resin and ultra-high pressure impregnation and carbonization(UHPIC)technology.The extremely high char yield of PAA resin(85 wt.%)and high isotropic pressure of UHPIC(over 200 MPa)promote the densification of the composite.As a result,we achieve a high-density(1.90 g/cm^(3))C/C composite with a high degree of graphitization(81%).This composite exhibits impressive properties,including flexural strength of 146 MPa,compressive strength of 187 MPa,and thermal conductivity of 147 W/(m K).When exposed to oxyacetylene flame at 3000 K for 100 s,it displays minimal linear ablation,with a rate of 1.27×10^(-2)mm/s.This study demonstrates the exceptional graphitizable characteristic of PAA resin,setting it apart from conventional resins.Our time-saving and cost-effective approach holds significant promise for aerospace applications,particularly in harsh aerodynamic heating environments. 展开更多
关键词 C/C composite Resistance to ablation POLYARYLACETYLENE ultra-high pressure impregnation and carbonization GRAPHITIZATION
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Grain-refining fabrication of nanocrystalline(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Eu_(0.2))_(2)Zr_(2)O_(7)high-entropy ceramics by ultra-high pressure sintering 被引量:3
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作者 Zhangtian Wu Wei Ji +4 位作者 Jinyong Zhang Yanan Yuan Ji Zou Weimin Wang Zhengyi Fu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第36期205-212,共8页
As an important A_(2)B_(2)O_(7)-type ceramic,(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Eu_(0.2))_(2)Zr_(2)O_(7)high-entropy pyrochlore pos-sesses promising properties such as high melting point,high chemical durability,and low... As an important A_(2)B_(2)O_(7)-type ceramic,(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Eu_(0.2))_(2)Zr_(2)O_(7)high-entropy pyrochlore pos-sesses promising properties such as high melting point,high chemical durability,and low thermal conductivity.However,the low sintering ability limits its application in thermal barrier coating and radioactive waste immobilization.It usually needs long-term high-temperature soaking to achieve full density,but with inevitable grain growth.In this work,dense and grain-refined nanocrystalline(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Eu_(0.2))_(2)Zr_(2)O_(7)ceramics were prepared with ultra-high pressure sintering(UHPS)method under 10 GPa at a low temperature of 800℃.The densification behavior,microstructure evo-lution,and properties of the UHPS-ed samples were then investigated.The grain size of as-prepared(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Eu_(0.2))_(2)Zr_(2)O_(7)ceramic was only 151 nm,which is 40%smaller than that of raw pow-der.In addition,it exhibited advantageous properties including both high hardness and aqueous durabil-ity.Plastic deformation under ultra-high pressure was believed as the dominant densification mechanism responsible for grain refinement and property improvement. 展开更多
关键词 High-entropy ceramics ultra-high pressure sintering Grain refining NANOCRYSTALLINE Plastic deformation
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Dynamic Compression Behavior of Ultra-high Performance Cement-based Composite with Hybrid Steel Fiber Reinforcements 被引量:1
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作者 RONG Zhidan WANG Yali WU Shenping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第5期900-907,共8页
Ultra-high performance cement-based composites (UHPCC) is promising in construction of concrete structures that suffer impact and explosive loads.In this study,a reference UHPCC mixture with no fiber reinforcement and... Ultra-high performance cement-based composites (UHPCC) is promising in construction of concrete structures that suffer impact and explosive loads.In this study,a reference UHPCC mixture with no fiber reinforcement and four mixtures with a single type of fiber reinforcement or hybrid fiber reinforcements of straight smooth and end hook type of steel fibers were prepared.Split Hopkinson pressure bar (SHPB) was performed to investigate the dynamic compression behavior of UHPCC and X-CT test and 3D reconstruction technology were used to indicate the failure process of UHPCC under impact loading.Results show that UHPCC with 1% straight smooth fiber and 2% end hook fiber reinforcements demonstrated the best static and dynamic mechanical properties.When the hybrid steel fiber reinforcements are added in the concrete,it may need more impact energy to break the matrix and to pull out the fiber reinforcements,thus,the mixture with hybrid steel fiber reinforcements demonstrates excellent dynamic compressive performance. 展开更多
关键词 ultra-high performance cement-based composite dynamic compression behavior hybrid fiber reinforcements split Hopkinson pressure bar
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Effects of dynamic ultra-high pressure homogenization on the structure and functional properties of casein 被引量:5
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作者 Chunyan Wang Yaping Ma +5 位作者 Benguo Liu Zhuangli Kang Sheng Geng Jianan Wang Lipeng Wei Hanjun Ma 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2019年第1期229-234,共6页
Dynamic ultra-high pressure homogenization(UHPH)is a novel high-pressure processing technique.In this study,the effects of dynamic UHPH on the structure and functional properties of casein were systematically investig... Dynamic ultra-high pressure homogenization(UHPH)is a novel high-pressure processing technique.In this study,the effects of dynamic UHPH on the structure and functional properties of casein were systematically investigated.It was found that the functional properties of casein changed with dynamic UHPH treatment,and the treatment at 150 MPa could significantly improve casein aqueous solubility,foaming and emulsifying properties.These functional improvements could be attributed to its structural changes,since the dynamic UHPH treatment could change the secondary structure,promote the interchange reaction between the disulfide bond and the sulfhydryl group,and increase the surface hydrophobicity.The obtained results could broaden the application of casein and provide ideas for the non-thermal processing of proteins. 展开更多
关键词 CASEIN dynamic ultra-high pressure homogenization functional properties secondary structure HYDROPHOBICITY non-thermal processing
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ULTRA-HIGH PRESSURE DIFFERENTIAL THERMAL DETERMINATION OF DIASPORITE 被引量:2
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作者 王筑明 谢鸿森 +1 位作者 张月明 徐惠刚 《Chinese Science Bulletin》 SCIE EI CAS 1991年第18期1545-1548,共4页
Water plays an important role in the evolution history of the earth and the water in the deep earth mainly exists in minerals and magma melt. The study on ultra-high pressure differential thermal determination ofhydro... Water plays an important role in the evolution history of the earth and the water in the deep earth mainly exists in minerals and magma melt. The study on ultra-high pressure differential thermal determination ofhydroites and their stability and mechanism of dehydration-dehydroxylation are significant for the understanding of the heat evolution history 展开更多
关键词 diasporite ultra-high pressure DIFFERENTIAL THERMAL determination.
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Flow excitation mechanisms of unbalanced impeller forces after pump power-trip of ultra-high head pump-turbines
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作者 FU XiaoLong LI DeYou +3 位作者 LV JingWei YANG Biao WANG HongJie WEI XianZhu 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第5期1602-1611,共10页
To elucidate the dynamic mechanisms of unbalanced impellers in ultra-high head pump-turbines(PTs),this study employed a one-and three-dimensional coupled method to simulate the pump power-trip(PPT)process of an ultra-... To elucidate the dynamic mechanisms of unbalanced impellers in ultra-high head pump-turbines(PTs),this study employed a one-and three-dimensional coupled method to simulate the pump power-trip(PPT)process of an ultra-high head PT.The investigation revealed two novel pulsation frequency components,denoted as fDVand fINFT,associated with impeller forces.The pulsation intensities of these components were markedly higher than those of rotor-stator interaction frequency components in ultra-high head PTs.Notably,the fDVcomponents exhibited pulsations at 1–2 times the rated rotation frequency of the impeller,spanning the entire transition period.Meanwhile,the fINFTcomponents constituted a complex frequency band with various frequency values,primarily occurring near conditions(Q=0,n=0,M=0,and d M/dt=0).These two pulsation frequency components were predominantly linked to the unsteady evolution of dean vortices inside the volute and complex transitions of the flow pattern within the impeller,respectively.It is crucial to note that these unbalanced flow-induced impeller axial forces can elevate the risk of accidents where the rotor is subjected to significant upwind axial forces.These findings offer valuable insights into mitigating the risk of rotor lifting due to axial forces during PT events in ultra-high head PTs. 展开更多
关键词 ultra-high head pump-turbine pump power-trip unbalanced impeller forces pressure pulsations flow pattern transitions
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超高压处理对乳清分离蛋白凝胶特性的影响 被引量:5
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作者 卫永华 刘永娟 +2 位作者 杨莉 张志健 刘会平 《食品与发酵工业》 CAS CSCD 北大核心 2018年第8期203-210,共8页
研究了超高压处理压力、时间、蛋白质量浓度、pH值、CaCl_2对乳清分离蛋白(whey protein isolated,WPI)凝胶特性的影响。当处理压力≥300 MPa、处理时间≥10 min、蛋白质质量浓度≥12 g/L时,WPI溶液经超高压处理后可以形成凝胶,且随着... 研究了超高压处理压力、时间、蛋白质量浓度、pH值、CaCl_2对乳清分离蛋白(whey protein isolated,WPI)凝胶特性的影响。当处理压力≥300 MPa、处理时间≥10 min、蛋白质质量浓度≥12 g/L时,WPI溶液经超高压处理后可以形成凝胶,且随着处理压力增大、处理时间延长和蛋白质浓度的提高,凝胶中二硫键含量明显升高,凝胶网络结构趋于致密,质地逐渐细腻,凝胶强度、得率和保水性呈现增大的趋势;WPI溶液pH在等电点以上且接近中性时,形成凝胶的二硫键含量较高,凝胶网络致密,凝胶品质较好;添加CaCl_2对形成凝胶的二硫键含量不产生影响,但其可以通过键桥作用提高凝胶强度;凝胶得率与CaCl_2浓度呈负相关。当CaCl_2浓度为0.06mol/L时,凝胶具有较大保水能力,之后保水性随Ca^(2+)浓度的升高而下降。 展开更多
关键词 超高压(ultra-high pressure UHP) 乳清分离蛋白(whey protein isolated WPI) 凝胶特性
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Ultrahigh pressure (>7 GPa) gneissic K-feldspar (-bearing) garnet clinopyroxenite in the Altyn Tagh, NW China: Evi- dence from clinopyroxene exsolution in garnet 被引量:38
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作者 LIU Liang1,3, CHEN Danling1, ZHANG Anda1, SUN Yong1, WANG Yan1, YANG Jiaxi1,2 & LUO Jinhai1 1. Key Laboratory of Continental Dynamics of the Ministry of Education of China, Northwest University, Xi’an 710069, China 2. College of Earth Science and Land Resources, Chang’an University, Xi’an 710054, China 3. The Laboratory of Orogen and Basin of the Ministry of Education, Peking University, Beijing 100871, China 《Science China Earth Sciences》 SCIE EI CAS 2005年第7期1000-1010,共11页
The exsolution of clinopyroxene and rutile in coarse-grain garnet is found in the gneissic K-feldspar(-bearing) garnet clinopyroxenite from Yinggelisayi in the Altyn Tagh, NW China. The maximum content of the exsolved... The exsolution of clinopyroxene and rutile in coarse-grain garnet is found in the gneissic K-feldspar(-bearing) garnet clinopyroxenite from Yinggelisayi in the Altyn Tagh, NW China. The maximum content of the exsolved clinopyroxene in the garnet is up to >5% by volume. The reconstructed precursor garnet (Grt1) before exsolution has a maximum Si content of 3.061 per formula uint, being of supersilicic or majoritic garnet. The peak-stage metamorphic pressure of >7 GPa is estimated using the geobarometer for volume percentage of exsolved pyroxene in garnet and the Si-(Al+Cr) geobarometer for majoritic garnet, and the temperature of about 1000℃ using the ternary alkali-feldspar geothermometer and the experimental data of ilmen- ite-magnetite solid solution. The protoliths of the rocks are intra-plate basic and intermediate ig- neous rocks, of which the geochemical features indicate that they are probably the products of the evolution of basic magma deriving from the continental lithosphere mantle. The rocks are in outcrops associated with ultrahigh pressure garnet-bearing lherzolite and ultrahigh pressure garnet granitoid gneiss. All of these data suggest that the ultrahigh pressure metamorphic rocks in the Altyn Tagh are the products of deep-subduction of the continental crust, and such deep- subduction probably reaches to >200 km in depth. This may provide new evidence for further discussion of the dynamic mechanism of the formation and evolvement of the Altyn Tagh and the other collision orogenic belts in western China. 展开更多
关键词 Altyn Tagh gneissic K-FELDSPAR (-bearing) GARNET clinopyroxenite CLINOPYROXENE EXSOLUTION in GARNET ultra-high pressure metamorphism.
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Tectonic Framework and Evolution of the Dabie Mountains in Anhui, Eastern China 被引量:15
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作者 Xu Shutong Jiang Laili +1 位作者 Liu Yican Zhang Yong Institute of Geological Sciences of Anhui Province, Hefei, Anhui Sun Sheping 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1992年第3期221-238,326,共19页
The Dabie Mountains are believed to be a collisional orogenic belt between the Yangtze amd Sino-Koreancontinental plates. It is composed of the foreland fold-thrust zone, the subducting cover and basement of theYangtz... The Dabie Mountains are believed to be a collisional orogenic belt between the Yangtze amd Sino-Koreancontinental plates. It is composed of the foreland fold-thrust zone, the subducting cover and basement of theYangtze continental plate, the coesite- and diamond-bearing ultra-high pressure metamorphic zone and themeta-ophiolitic melange zone in the subducting basement, the fore-arc flysch nappe and the back thrust zoneoccurring respectively on the southern and northern margins of the Sino-Korean continental plate and the in-herited basin with molassic deposits on the northern margin. When the palaeo-Dabie oceanic plate subductednorthward in the Early Palaeozoic, volcanic arc and back arc basin probably formed on the southern margin ofthe Sino-Korean continental plate. The Sm / Nd isotopic dating of the strata and eclogite which were drawn in-to the foreland fold-thrust zone indicates that the intense collision of the two continental plates took place inthe Early Mesozoic. 展开更多
关键词 collisional orogenic belt ultra-high pressure metamorphic zone ophiolitic melange zone COESITE DIAMOND
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Eclogites of the Dabie Region: Retrograde Metamorphismand Fluid Evolution 被引量:4
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作者 顾连兴 杜建国 +3 位作者 翟建平 赵成浩 范建国 张文兰 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2002年第2期166-182,共17页
Based upon fluid effects, retrograde metamorphism of eclogites in the Dabieregion can be divided into the fluid-poor, fluid-bearing and fluid-rich stages. The fluid-poor stageis marked by polymorphic inversion, recrys... Based upon fluid effects, retrograde metamorphism of eclogites in the Dabieregion can be divided into the fluid-poor, fluid-bearing and fluid-rich stages. The fluid-poor stageis marked by polymorphic inversion, recrystallization and exsolution of solid solutions, and isthought to represent eclogite-facies retrograde environments. The fluid-bearing stage is likely tohave occurred at the late stage of ecologite-facies diaphthorosis and is represented by kyaniteporphyroblasts, rutile, and sodic pyroxene in association with high-pressure hydrous minerals suchas phengite and zoisite (clinozoisite) without significant amount of hydrous minerals such asamphibole, epidote and biotite. The fluid-rich stage might have commenced concomitantly with loweramphibolite-facies diaphthoresis and persisted all the way towards the near-surface environment. Theproduct of this stage is characterized by plentiful hydrous and volatile-bearing phases.The dissemination-type rutile mineralizations in eclogites might have formed by preferentialshearing-induced pressure solution of gangue minerals at the fluid-bearing stage. The accompanyingvein rutile was precipitated from fluids of this stage after local transport and concentration, andmay hence represent proximal mobilization of titanium from the eclogite. Therefore, rutile veins canbe used as an exploration indicator for dissemination-type rutile deposits. 展开更多
关键词 ultra-high pressure metamorphism ECLOGITE retrograde metamorphism fluid activity rutile ore DABIE
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Crustal structure of the eastern Dabie orogenic belt from the seismic tomography and wide-angle reflection studies 被引量:2
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作者 史大年 姜枚 +2 位作者 彭聪 薛光琦 魏素花 《Acta Seismologica Sinica(English Edition)》 CSCD 1999年第4期447-456,495,共11页
The studies of seismic tomography and wide-angle reflection have been carried out to reveal the velocity structUrebeneath the eastern Dabie orogenic belt. The result from the seismic tomography shows the high velocity... The studies of seismic tomography and wide-angle reflection have been carried out to reveal the velocity structUrebeneath the eastern Dabie orogenic belt. The result from the seismic tomography shows the high velocity bodiesmight be positioned to a depth of only about 1 .5 km below sea level within the Dabie ultra-high pressure metamorphic (UHPM) belt; the fan-profile shows the Shuihou-Wuhe fault, the demarcation between the South Dabieand the North Dabie, slopes to the south-west at a dip angle of about 45° in the bottom of upper crust. The wideangle reflection shows the middle crustal boundaries and the complex features from the lower crust. 展开更多
关键词 Dabie orogenic belt ultra-high pressure metamorphic belt(UHPM) seismic tomography wide-angle reflection
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Piezoresistive pressure sensor with high sensitivity for medical application using peninsula-island structure 被引量:1
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作者 Tingzhong XU Hongyan WANG +6 位作者 Yong XIA Zhiming ZHAO Mimi HUANG Jiuhong WANG Libo ZHAO Yulong ZHAO Zhuangde JIANG 《Frontiers of Mechanical Engineering》 SCIE CSCD 2017年第4期546-553,共8页
Abstract A novel micro-electromechanical systems piezoresistive pressure sensor with a diagonally positioned peninsula-island structure has high sensitivity for ultra- low-pressure measurement. The pressure sensor was... Abstract A novel micro-electromechanical systems piezoresistive pressure sensor with a diagonally positioned peninsula-island structure has high sensitivity for ultra- low-pressure measurement. The pressure sensor was designed with a working range of 0-500 Pa and had a high sensitivity of 0.06 mV-V^-1-Pa-1. The trade-off between high sensitivity and linearity was alleviated. Moreover, the influence of the installation angle on the sensing chip output was analyzed, and an application experiment of the sensor was conducted using the built pipettor test platform. Findings indicated that the proposed pressure sensor had sufficient resolution ability and accuracy to detect the pressure variation in the pipettor chamber. Therefore, the proposed pressure sensor has strong potential for medical equipment application. 展开更多
关键词 MEMS low pressure sensor peninsula-island ultra-high sensitivity medical application
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Fabrication of metal/metal functionally graded materials with a high melting point difference 被引量:1
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作者 Zhangjian Zhou Changchun Ge 《Journal of University of Science and Technology Beijing》 CSCD 2005年第5期427-430,共4页
Three kinds of full compositional distribution (from 0 to 100wt%W) W/Cu FGMs (functionally graded materials) with high density is fabricated by resistance sintering under ultra-high pressure. Microstructure analys... Three kinds of full compositional distribution (from 0 to 100wt%W) W/Cu FGMs (functionally graded materials) with high density is fabricated by resistance sintering under ultra-high pressure. Microstructure analysis showed that the good grading composition of all FGMs has been obtained. The sintering mechanism of W is mainly solid state sintering. Thermal shock test in air demonstrated that the grading at the interface between W and Cu is effective for the reduction of thermal stress, but obvious transver- se and vertical cracks occur in the pure W layer. The oxidation of the W60Cu40 layer and the W40Cu60 layer is heavier than that of the other layers. 展开更多
关键词 FGM resistance sintering ultra-high pressure high melting difference W Cu
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Design and Key Technology of Oil-Free Centrifugal Air Compressor for Hydrogen Fuel Cell 被引量:3
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作者 Hongjie Zhang Wenfei Yu Wei Hua 《CES Transactions on Electrical Machines and Systems》 CSCD 2022年第1期11-19,共9页
For a 120 kW hydrogen fuel cell system,a centrifugal air compressor with fixed power of 22 kW fuel cell is designed.Firstly,the theoretical calculation is carried out for the aerodynamic characteristics of a ultra-hig... For a 120 kW hydrogen fuel cell system,a centrifugal air compressor with fixed power of 22 kW fuel cell is designed.Firstly,the theoretical calculation is carried out for the aerodynamic characteristics of a ultra-high-speed permanent magnet synchronous motor,an air compressor,and an aerodynamic foil bearing.Then,a prototype is trial-produced and a related test bench is built for test verification.Finally,both the simulation and test results indicate that the designed centrifugal air compressor meets the overall requirements of the hydrogen fuel cell system,and the relevant conclusions provide both theoretical and experimental references for the subsequent series development and design of the centrifugal air compressor. 展开更多
关键词 Hydrogen fuel cell Centrifugal air compressor ultra-high speed permanent magnet synchronous motor Compressor impeller Air pressure foil bearing
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