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论造物学视阈下艺术设计研究的新理念 被引量:3
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作者 兰芳 《南京艺术学院学报(美术与设计)》 CSSCI 北大核心 2018年第2期131-134,共4页
造物学视阈是更适用于中国古代造物艺术研究的一个方向。因此,立足于中国文化传统,以古代造物美学思想中"物""象""道"文化内涵为理论基础,确定造物学视阈的研究方向,包括其发展逻辑、知识架构与文化内涵... 造物学视阈是更适用于中国古代造物艺术研究的一个方向。因此,立足于中国文化传统,以古代造物美学思想中"物""象""道"文化内涵为理论基础,确定造物学视阈的研究方向,包括其发展逻辑、知识架构与文化内涵显得尤为重要。同时这个问题的确定给中国当前艺术设计的研究提供一条通向中国民族造物经验的新思路。 展开更多
关键词 造物学 造物学视阈 艺术设计研究
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造物学视阈下的汉代建筑明器研究 被引量:2
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作者 兰芳 顾平 《艺术设计研究》 CSSCI 2015年第2期100-102,共3页
随着考古学的发展,大量汉代建筑明器被发现,在考古材料的基础上,本文拟对汉代建筑明器进行造物学研究,从汉代民族的生存、创造、信仰等方面来深入了解文化传统;从民间艺术角度挖掘汉代民族的造物意识,探究传统造物艺术的设计理念,加强... 随着考古学的发展,大量汉代建筑明器被发现,在考古材料的基础上,本文拟对汉代建筑明器进行造物学研究,从汉代民族的生存、创造、信仰等方面来深入了解文化传统;从民间艺术角度挖掘汉代民族的造物意识,探究传统造物艺术的设计理念,加强对造物学研究的自觉性。 展开更多
关键词 造物学 汉代 建筑明器
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汉代陶楼“造物学”研究的新收获——评兰芳《西北有高楼:汉代陶楼的造物艺术寻踪》
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作者 朱存明 窦萌 《中国美术研究》 2020年第2期166-168,共3页
在汉代的明器中,发现有众多的陶楼,反映了汉代建筑艺术的水平,同时又是研究汉代造物观念的载体。汉代人对楼居的追求,是生前与死后的理想表现。陶楼作为一种微缩的陶质雕塑,表现了汉代人的"造物艺术"观念,是汉代民间艺术的代... 在汉代的明器中,发现有众多的陶楼,反映了汉代建筑艺术的水平,同时又是研究汉代造物观念的载体。汉代人对楼居的追求,是生前与死后的理想表现。陶楼作为一种微缩的陶质雕塑,表现了汉代人的"造物艺术"观念,是汉代民间艺术的代表之一,对我们重建汉代建筑史有一定意义。 展开更多
关键词 汉代陶楼 造物学 艺术史
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《考工记》造物色彩学论纲发凡
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作者 邓水兰 《艺苑》 2019年第6期71-75,共5页
针对艺术学学科学人们对《考工记》的色彩研究文献中"以偏概全"与"不成系统"的现象,通过以社会学为理论支撑,从造物色彩学的学科高度,基于《考工记》中百工的造物色彩事象,对其进行系统性的研究;研究着力于挖掘《... 针对艺术学学科学人们对《考工记》的色彩研究文献中"以偏概全"与"不成系统"的现象,通过以社会学为理论支撑,从造物色彩学的学科高度,基于《考工记》中百工的造物色彩事象,对其进行系统性的研究;研究着力于挖掘《考工记》的造物色彩与建构《考工记》造物色彩学论纲发凡,建构《考工记》造物色彩学的本体论、设计论、制度论、文化论、价值论、审艺论与误读论,不仅能够全局性地关注《考工记》造物色彩,还能从学科的视角对其进行理论建构,为色彩学学科填补造物色彩学中的《考工记》造物色彩研究空白。 展开更多
关键词 考工记 造物 造物色彩 《考工记》造物色彩论纲
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Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China 被引量:2
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作者 DING Wei-wei DAI Jin-xing +1 位作者 CHU Feng-you HAN Xi-qiu 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第7期1011-1020,共10页
We studied the geochemical characteristics of the fluid inclusions in the Ordovician carbonates and the Oligocene Shahejie Formation sandstones from 15 wells in the Gangxi Fault Belt, Huanghua Depression. The fluid in... We studied the geochemical characteristics of the fluid inclusions in the Ordovician carbonates and the Oligocene Shahejie Formation sandstones from 15 wells in the Gangxi Fault Belt, Huanghua Depression. The fluid inclusions are all sec- ondary with gas/liquid ratio of 5%~10%. Base on Raman they are mainly composed of H2O, CO2 and CH4. The homogenization temperatures, combined with burial and geothermal history of the host rock, indicate that the fluid flows in the Shahejie Formation and the Ordovician carbonates were trapped in Neocene. Using a VG5400 mass spectrometer, the helium isotopic compositions were analyzed. Interpretation of results suggested a significant amount of mantle-derived helium mainly accumulating in the intersections of the NWW trending Xuzhuangzi and NE trending Gangxi faults. The maturity of hydrocarbon decreases from the intersection to the outside pointing out that the fluid related to the NWW trending Xuzhuangzi and NE trending Gangxi faults. These factors implied the fluid inclusions have a close relationship to the local tectonic setting. Gangxi Fault Belt experienced intensive Neo-tectonic activities in Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its tec- tonic status of extensional stress field. Mantle uplift caused the movement of magma that carried mantle-derived gases and deep heat flows, the deep-rooted tension faults provided the passages for the gases and heat flows to shallow crust levels. 展开更多
关键词 Gangxi Fault Belt Fluid inclusion Composition MANTLE-DERIVED Maturity Local tectonic setting
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Ex vivo expansion and pluripotential differentiation of cryopreserved human bone marrow mesenchymal stem cells 被引量:13
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作者 XIANG Ying ZHENG Qiang +4 位作者 JIA Bing-bing HUANG Guo-ping Xu Yu-lin WANG Jin-fu PAN Zhi-jun 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2007年第2期136-146,共11页
This study is aimed at investigating the potentials of ex vivo expansion and pluri-differentiation of cryopreservation of adult human bone marrow mesenchymal stem cells (hMSCs) into chondrocytes, adipocytes and neur... This study is aimed at investigating the potentials of ex vivo expansion and pluri-differentiation of cryopreservation of adult human bone marrow mesenchymal stem cells (hMSCs) into chondrocytes, adipocytes and neurocytes. Cryopreserved hMSCs were resuscitated and cultured for 15 passages, and then induced into chondrocytes, adipocytes and neurocytes with corresponding induction medium. The induced cells were observed for morphological properties and detected for expressions of type II collagen, triglyceride or neuron-specific enolase and nestin. The result showed that the resuscitated cells could differentiate into chondrocytes after exposure to transforming growth factor 61 (TGF-~0, insulin-like growth factor I (IGF-I) and vitamin C (Vc), and uniformly changed morphologically from a spindle-like fibroblastic appearance to a polygonal shape in three weeks. The induced cells were heterochromatic to safranin O and expressed cartilage matrix-procollagenal (If) mRNA. The resuscitated cells cultured in induction medium consisting of dexamethasone, 3-isobutyl-l-methylxanthine, indomethacin and IGF-I showed adipogenesis, and lipid vacuoles accumulation was detectable after 21 d. The resuscitated hMSCs were also induced into neurocytes and expressed nestin and neuron specific endolase (NSE) that were special surface markers associated with neural cells at different stage. This study suggested that the resuscitated hMSCs should be still a population ofpluripotential cells and that it could be used for establishing an abundant bMSC reservoir for further experiment and treatment of various clinical discases. 展开更多
关键词 Bone marrow mesenchymal stem cells CRYOPRESERVATION EXPANSION DIFFERENTIATION
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Large-Scale Dextral Strike-Slip Movement and Associated Tectonic Deformation Along the Red-River Fault Zone
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作者 Xiang Hongfa Han Zhujun +2 位作者 Guo Shunmin Zhang Wanxia Chen Lichun 《Earthquake Research in China》 2005年第2期125-138,共14页
Field investigation has revealed that the large-scale dextral strike-slip movement and the associated tectonic deformation along the Red River fault zone have the following features: geometrically, the Red River fault... Field investigation has revealed that the large-scale dextral strike-slip movement and the associated tectonic deformation along the Red River fault zone have the following features: geometrically, the Red River fault zone can be divided into three deformation regions, namely, the north, central and south regions. The north region lies on the eastern side of the Northwest Yunnan extensional taphrogenic belt, which is characterized by the 3 sets of rift-depression basins striking NNW, NNE and near N-S since the Pliocene time, and on its western side is the Lanping-Yunlong compressive deformation belt of the Paleogene to Neogene; the deformation in the central region is characterized by dextral strike-slip or shearing. The east Yunnan Miocene compressive deformation belt lies on the eastern side of the fault in the south, and the Tengtiaohe tensile fault depression belt is located on its west. In terms of tectonic geomorphology, the aforementioned deformation is represented by basin-range tectonics in the north, linear faulted valley-basins in the central part and compressive (or tensional) basins in the south. Among them, the great variance in elevation of the planation surfaces on both sides of the Cangshan-Erhai fault suggests prominent normal faulting along the Red River fault since the Pliocene. From the viewpoint of spatial-temporal evolution, the main active portion of the fault was the southern segment in the Paleogene-Miocene-Pliocene, which is represented by “tearing” from south to north. The main active portion of the fault has migrated to the northern segment since the Pliocene, especially in the late Quaternary, which is characterized by extensional slip from north to southeast. The size of the deformation region and the magnitude of deformation show that the eastern plate of the Red River fault has been an active plate of the relative movement of blocks. 展开更多
关键词 Extensive-strike slip-compressive deformation Tectonic geomorphology MIOCENE Red River fault zone Southwest China
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Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure 被引量:18
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作者 吴晓琴 童仕唐 +1 位作者 官宝红 吴忠标 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第2期349-355,共7页
Direct phase transformation of flue gas desulfurization gypsum in hot salt solution at atmospheric pres-sure was investigated.The effects of temperature,salt species,salt concentration,solids content,pH and modifier w... Direct phase transformation of flue gas desulfurization gypsum in hot salt solution at atmospheric pres-sure was investigated.The effects of temperature,salt species,salt concentration,solids content,pH and modifier were examined.The crystals obtained under different conditions and solubility of calcium sulfate in contact with solid gypsum were also determined.α-Calcium sulfate hemihydrate crystals of stubby columnar shape and regular pentahedral sides were obtained under the following conditions:salt concentration 20%-30%,operation tempera-ture 95-100 °C,solids mass content in the slurry 10%-30% and neutral pH.Thermodynamic analysis revealed that phase transformation of calcium sulfate dihydrate to α-calcium sulfate hemihydrate occurs because of the difference in solubilities between the two solid gypsum phases in this system. 展开更多
关键词 flue gas desulfurization gypsum crystal growth thermogravimetric analysis phase transformation
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Remote sensing needs and capabilities in West Africa
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作者 Edward M.Osei Jr. 《Journal of Geoscientific Research in Northeast Asia》 2004年第1期97-104,共8页
The greatest advantage of remote sensing over conventional measurements lies in the opportunity to carry out detailed spatio-temporal analysis of land and ocean features on a very frequent basis. This paper analyses t... The greatest advantage of remote sensing over conventional measurements lies in the opportunity to carry out detailed spatio-temporal analysis of land and ocean features on a very frequent basis. This paper analyses the contribution of satellite imagery to atmospheric, geophysical and ocean studies and management in West Africa since the early 1980s. The detailed application of data from optical sensors (e.g. Meteosat,NOAA/AVHRR, SPOT, Landsat TM, etc.) for weather prediction, hydrogeologicah landuse/cover and cartographic studies has been acknowledged. However, the use of microwave (e.g. SAR) and optical data for ocean monitoring and studies in the sub-region is still very limited. Even though sufficient remote sensing expertise and infrastructure is perceived in the region, no clearly defined networking or database exists. 展开更多
关键词 remote sensing ATMOSPHERIC land and ocean studies West Africa
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Research on Oxalate Oxidase and Its Genes in Plants 被引量:1
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作者 WANG Li WANG Xiao-li +2 位作者 LIU jia YI Zhi-gang DONG Zhi-min 《Agricultural Science & Technology》 CAS 2011年第1期11-13,19,共4页
This paper introduces the discovery,composition and structure of oxalate oxidase,as well as illustrates the biological functions of this enzyme.With a comprehensive introduction upon previous researches upon gene clon... This paper introduces the discovery,composition and structure of oxalate oxidase,as well as illustrates the biological functions of this enzyme.With a comprehensive introduction upon previous researches upon gene cloning and heredity transformation of this enzyme,it indicates that heredity transformation can increase the content of oxalate oxidase within the plants and also enhance their resistance.The paper also points out the problems such as lack of gene resources and difficulty in the transformation of heterologous genes,and the focus in later researches should be laid upon the exploration of plant resources relative to this enzyme and selection of resistant species. 展开更多
关键词 Oxalate oxidase(OXO) Biological functions Gene cloning Gene transformation
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Zhang Heng's Seismoscope( 1):Its Emergence 被引量:2
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作者 Feng Rui Wu Yuxia 《Earthquake Research in China》 2014年第1期1-11,共11页
The emergence of Zhang Heng's seismoscope has a profound historical background. This paper intends to explore the formation and material basis of Zhang Heng's scientific thought. It appears that the simple int... The emergence of Zhang Heng's seismoscope has a profound historical background. This paper intends to explore the formation and material basis of Zhang Heng's scientific thought. It appears that the simple intention of "observing visions and distinguishing good fortune or misfortune"was his motivation to develop the seismoscope. Tracing its historical background,the authors proposed in this paper that the development of this seismoscope started around 128 A. D., and based on perceptual knowledge, two ideas about earthquakes came into being,i. e.,earthquake location could be judged according to the instrument shaking direction, and the earthquake and earth split were essentially different. In the instrument manufacture,Zhang Heng advocated a principle of "making utensils to imitate cosmos". By this principle,the following three problems were readily solved: the seismoscope imitated the response of the suspension system to earthquakes( i. e. natural seismoscope). Technically,the trigger mechanism of the latch was used for reference,and it recorded the physical evidence of earthquake occurrence by an ingenious way of a ball dropping from a dragon's mouth. The solution of these three key problems lead to the emergence of the seismoscope in 132 A. D. and the successful detection of an earthquake in 134 A. D. His invention deepened humanity's knowledge of natural laws, and promoted the development of science and technology in that time and later. 展开更多
关键词 Invention of Zhang Heng's seismoscope Ancient concept of earthquake Suspension system Trigger mechanism
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"Artificial Sperms" Induced from Mice Oocytes
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《Bulletin of the Chinese Academy of Sciences》 2015年第4期241-242,共2页
On Nov 17th,a team of researchers from the Shanghai Institute of Biochemistry and Cell Biology(SIBCB),Shanghai Institutes for Biological Sciences,CAS led by Prof.LI Jinsong reports online in Cell Research a novel te... On Nov 17th,a team of researchers from the Shanghai Institute of Biochemistry and Cell Biology(SIBCB),Shanghai Institutes for Biological Sciences,CAS led by Prof.LI Jinsong reports online in Cell Research a novel technique to induce from mice oocytes haploid embryonic stems cells(haESCs)that can fully replace the reproductive functions of sperms,greatly simplifying the otherwise complicated techniques to produce such stem cells and semi-cloned(SC)mice.It is anticipated that this will further facilitate research in the field of stem cells and embryonic development; 展开更多
关键词 cloned genomic embryonic haploid imprinting replace facilitate otherwise cloning oocyte
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Biochemical and radiological predictors of malignant biliary strictures
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作者 Ibrahim A.AI-Mofleh Abdulrahman M.Aljebreen +5 位作者 Saleh M.AlAmri Rashed S.AJ-Rashed Faleh Z.Al-Faleh Hussein M.AJ-Freihi Ayman A.Abdo Arthur C.Isnani 《World Journal of Gastroenterology》 SCIE CAS CSCD 2004年第10期1504-1507,共4页
AIM: Differentiation of benign biliary strictures (BBS) from malignant biliary strictures (MBS) remains difficult despite improvement in imaging and endoscopic techniques. The aim of this study was to identify the cli... AIM: Differentiation of benign biliary strictures (BBS) from malignant biliary strictures (MBS) remains difficult despite improvement in imaging and endoscopic techniques. The aim of this study was to identify the clinical, biochemical and or radiological predictors of malignant biliary strictures.METHODS: We retrospectively reviewed all charts of patients who had biliary strictures (BS) on endoscopic retrograde cholangiopancreatography (ERCP) or percutaneous cholangiography (PTC) in case of unsuccessful ERCP from March 1998 to August 2002. Patient characteristics, clinical features, biochemical, radiological and biopsy results were all recorded. Stricture etiology was determined based on cytology,biopsy or clinical follow-up. A receiver operator characteristic (ROC) curve was constructed to determine the optimal laboratory diagnostic criterion threshold in predicting MBS.RESULTS: One hundred twenty six patients with biliary strictures were enrolled, of which 72 were malignant. The mean age for BBS was 53 years compared to 62.4 years for MBS (P=0.0006). Distal bile duct stricture was mainly due to a malignant process 48.6% vs 9% (P=0.001). Alkaline phosphates and AST levels were more significantly elevated in MBS (P=0.0002). ROC curve showed that a bilirubin level of 84 μmol/L or more was the most predictive of MBS with a sensitivity of 98.6%, specificity of 59.3% and a positive likelihood ratio of 2.42 (95% CI=0.649-0.810). Proximal biliary dilatation was more frequently encountered in MBS compared to BBS, 73.8% vs39.5% (P=0.0001). Majority of BBS (87%) and MBS (78%) were managed endoscopically.CONCLUSION: A serum bilirubin level of 84 μmol/L or greater is the best predictor of MBS. Older age, proximal biliary dilatation, higher levels of bilirubin, alkaline phosphatase, ALT and AST are all associated with MBS. ERCP is necessary to diagnose and treat benign and malignant biliary strictures. 展开更多
关键词 Biliary Tract Diseases Biliary Tract Neoplasms Constriction Pathologic Predictive Value of Tests Age Factors BILIRUBIN CHOLANGIOGRAPHY Cholangiopancreatography Endoscopic Retrograde Humans Middle Aged ROC Curve Retrospective Studies Sensitivity and Specificity
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Weighing Leaves based on Physical Measurements and L-system Simulation
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作者 Xinyuan Gu 《International Journal of Technology Management》 2015年第4期113-115,共3页
In this paper, we revisit foundations of the applications of physical measurement and Lindenmayer system to the modeling of plants. The measurement is proposed to a formal procedure and measuring the mass of leaves on... In this paper, we revisit foundations of the applications of physical measurement and Lindenmayer system to the modeling of plants. The measurement is proposed to a formal procedure and measuring the mass of leaves on a tree, tailored to branching plant structures with Simpson' s rule and Monte Carlo Methods. L-system is possible to visualize mathematical models of biological structures and processes. The formalism is illustrated using theoretical branching systems, and applied to analyze total leaves number as well as total weight of them. 展开更多
关键词 Leaf Mass Physical Measurement L-SYSTEM FRACTAL
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Erosion and Sediment Disasters in Cambodia1
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作者 Bun Hean Vin Bun Pov 《Earthquake Research in China》 2002年第3期207-209,共3页
This report first gives a general description of Cambodia and then discusses its topographic and geological features. Finally, the current situation concerning erosion and sediment disasters is discussed.
关键词 Topographic and geological features Erosion and sediment disasters
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Coastal afforestation effects on soil properties at Hatiya in Bangladesh
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作者 K.M.Shaifullah S.M.Sirajul Haque +1 位作者 M.Sujauddin Shyamal Karmakar 《Journal of Forestry Research》 SCIE CAS CSCD 2009年第A3期243-248,287,共7页
An exploratory study was conducted in the coastal plantation (12-and 17-year-old Sonneratia apetala) of Char Alim and Char Piya and on their adjacent barren lands at Char Rehania and Char Nurul Islam in Hatiya of Noak... An exploratory study was conducted in the coastal plantation (12-and 17-year-old Sonneratia apetala) of Char Alim and Char Piya and on their adjacent barren lands at Char Rehania and Char Nurul Islam in Hatiya of Noakhali district, in Bangladesh to determine afforestation effects on soil properties. At soil depths of 0-10, 10-30 and 30-40 cm across three different land strips viz. inland, middle and sea side in 12-and 17-year-old keora (Sonneratia apetala) plantations, soil moisture, particle density, organic matter and C, total N, pH, available P, K, Na, Ca and Mg were significantly (p≤0.05, p≤0.01, p≤0.001) higher, and soil salinity significantly (p≤0.001) lower than that in their adjacent barren lands. Soil moisture, particle density, organic matter and C, total N, pH, soil salinity, available P, K, Na, Ca and Mg of surface soil in Char Alim plantation at inland were 31.09%, 2.24 g·cm-3, 2.41%, 4.14%, 0.58%, 7.07, 0.09 dS·cm-1, 28.06 mg·L-1, 0.50 mg·L-1 11.5 mg·L-1, 3.30 mg·L-1 and 2.7 mmol·kg-1, respectively. Their corresponding values for the same depth and land position at adjacent Char Rehania barren land were 16.69%, 1.25g·cm-3, 0.43%, 0.74%, 0.25%, 6.57, 0.13 dS·cm-1, 13.07mg·L-1, 0.30 mg·L-1, 1.4 mg·L-1, 0.30 mmol·kg-1 and 0.50 mg·L-1, respectively. Soil moisture, particle density, organic matter and C, total N, pH, available P, K and Ca decreased, and soil salinity, available Na and Mg increased from inland towards sea side in the plantations. Although soil texture did not differ in most soil depths between plantation and adjacent barren land, proportion of sand particle was significantly (p≤0.01) lower and silt particle significantly (p≤0.001) in the plantations higher than that in their adjacent barren lands. In the study, evaluation of all the parameters was also done for the other pair of lands. 展开更多
关键词 coastal afforestation keora plantation soil physicochemical properties afforestation effect soil texture soil base cations Sonneratia apetala BANGLADESH
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A Study of the Middle Construction in English with Special Reference to Learner's Dictionaries 被引量:1
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作者 朱晓丽 陈国华 《Chinese Journal of Applied Linguistics》 2013年第4期407-421,518,共16页
Although the middle construction has attracted significant attention from syntacticians, its identity still remains controversial and it is not treated as a separate grammatical category in any English learner's dict... Although the middle construction has attracted significant attention from syntacticians, its identity still remains controversial and it is not treated as a separate grammatical category in any English learner's dictionary. This article, based on the data collected from three English learner's dictionaries, investigates the middle construction in terms of its syntactic and semantic properties and the constraints on its use. It shows that the three learner's dictionaries treat the middle construction in inconsistent and problematic manners. The middle use of a verb is not distinguished from either transitive verbs with an implicit object or intransitive verbs, which may hinder English learners' acquisition of the construction. The article proposes that middle verbs should be treated as a separate subcategory of verbs on a par with transitive and intransitive verbs so that learners will become more aware of them and learn to use them correctly. 展开更多
关键词 middle construction transitive verb intransitive verb learner's dictionary
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Ionic liquids: Efficient solvent and medium for the transformation of renewable lignocellulose 被引量:3
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作者 LONG JinXing LI XueHui +1 位作者 WANG LeFu ZHANG Ning 《Science China Chemistry》 SCIE EI CAS 2012年第8期1500-1508,共9页
Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly coval... Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly covalent structure and strong intra and in- ter-molecular hydrogen bonding in lignoceUulose make it high recalcitrance to transformation due to the poor solubility in wa- ter or common organic solvents. Dissolution and transformation of lignocellulose and its constituents in ionic liquids have therefore attracted much attention recently due to the tunable physical-chemical properties. Here, ionic liquids with excellent dissolving capability for biomass and its ingredients were examined. The technologies for lignocellulose biorefining in the presence of ionic liquid solvents or catalysts were also summarized. Some pertinent suggestions for the future catalytic conver- sion and unitization of this sustained carbon-rich resource are proposed. 展开更多
关键词 ionic liquids LIGNOCELLULOSE DISSOLUTION BIOREFINERY
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Crustal and upper mantle structure and deep tectonic genesis of large earthquakes in North China 被引量:19
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作者 WANG ChunYong WU QingJu +2 位作者 DUAN YongHong WANG ZhiShuo LOU Hai 《Science China Earth Sciences》 SCIE EI CAS CSCD 2017年第5期821-857,共37页
From the 1960 s to 1970 s, North China has been hit by a series of large earthquakes. During the past half century,geophysicists have carried out numerous surveys of the crustal and upper mantle structure, and associa... From the 1960 s to 1970 s, North China has been hit by a series of large earthquakes. During the past half century,geophysicists have carried out numerous surveys of the crustal and upper mantle structure, and associated studies in North China.They have made significant progress on several key issues in the geosciences, such as the crustal and upper mantle structure and the seismogenic environment of strong earthquakes. Deep seismic profiling results indicate a complex tectonic setting in the strong earthquake areas of North China, where a listric normal fault and a low-angle detachment in the upper crust coexist with a high-angle deep fault passing through the lower crust to the Moho beneath the hypocenter. Seismic tomography images reveal that most of the large earthquakes occurred in the transition between the high-and low-velocity zones, and the Tangshan earthquake area is characterized by a low-velocity anomaly in the middle-lower crust. Comprehensive analysis of geophysical data identified that the deep seismogenic environment in the North China extensional tectonic region is generally characterized by a low-velocity anomalous belt beneath the hypocenter, inconsistency of the deep and shallow structures in the crust, a steep crustalal-scale fault,relative lower velocities in the uppermost mantle, and local Moho uplift, etc. This indicates that the lithospheric structure of North China has strong heterogeneities. Geologically, the North China region had been a stable craton named the North China Craton or in brief the NCC, containing crustal rocks as old as ~3.8 Ga. The present-day strong seismic activity and the lower velocity of the lower crust in the NCC are much different from typical stable cratons around the world. These findings provide significant evidence for the destruction of the NCC. Although deep seismic profiling and seismic tomography have greatly enhanced knowledge about the deep-seated structure and seismogenic environment, some fundamental issues still remain and require further work. 展开更多
关键词 North China Craton Crust and upper mantle structure Deep seismic sounding profile Deep seismic reflection profile Broadband seismic array Seismogenic environment
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Construction of Dulac functions for mathematical models in population biology 被引量:2
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作者 Osvaldo Osuna Cruz Vargas-De-Leon 《International Journal of Biomathematics》 2015年第3期135-154,共20页
In this paper, we present a method for constructing a Dulac function for mathematical models in population biology, in the form of systems of ordinary differential equations in the plane.
关键词 Population models epidemic models chemostat models Dulac function nonexistence of periodic orbits.
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