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Numerical study on short-circuit current of single layer organic solar cells with Schottkey contacts

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Science china(Technological Sciences) 2010年第4期53卷 1023-1027页

作者： MA ChaoZhu1,MENG WeiMin2,PENG YingQuan1,2,WANG RunSheng1,LI RongHua1,XIE HongWei1,WANG Ying1 & YE ZaoChen1 1 Institute of Microelectronics of School of Physical Science and Technology,lanzhou university,lanzhou {3.,china 2 key laboratory for magnetism and magnetic materials of the ministry of education,lanzhou university,lanzhou {3.,china 1. Institute of Microelectronics of School of Physical Science and Technology Lanzhou University Lanzhou 730000 China2. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University Lanzhou 730000 China

The influence of the cathode work function,carriers mobilities and temperature on the short-circuit current of single layer organic solar cells with Schottkey contacts was numerically studied,and the quantitative dependences of the short-circuit current on these quantities were *** results provide the theoretical foundation for experimental study of single layer organic solar cells with Schottkey contacts.

关键词： cathode work function carrier mobility temperature short-circuit current

MULTISCALE MECHANICAL BEHAVIORS IN DISCRETE materials: A REVIEW

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Acta Mechanica Solida Sinica 2010年第6期23卷 579-591页

作者： Xiaojing Zheng Dengming Wang (key laboratory of Mechanics on Western Disaster and Environment,the ministry of {3. of china,lanzhou university,lanzhou 73.000,china) [a] key laboratory of Mechanics on Western Disaster Environment the Ministry of Education of China Lanzhou University Lanzhou 730000 China

The discrete material, which belongs to the category of soft materials, is one of the most prevalent forms of matter in nature and engineering fields. These materials often exhibit abundant and complex mechanical properties which are still far from being perfectly understood. From the view of multi-scale framework concentrated on the ＇bridge＇ role in the macro-micro relation, this review mainly introduces some theoretical investigations of mechanical behaviors in discrete materials, including the continuum constitutive model based on the macroscopic phenomenological approach and coupled micro-macro approach, the statistical analysis of some microscopic physical quantities involved contacted forces between particles and its transmission within the whole system, and the statistical analysis for some microscopic processes in aeolian landform systems involving the grain-bed impact, the transportation and sedimentation of wind-blown sand flux, et al. Finally, some further worthwhile challenges in these fields are suggested.

关键词： discrete material multiple space and time scales trans-scales correlation sanddune statistical analysis

Dating and genesis of the upper Weihe River terraces in Longxi basin,china

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Progress in Natural Science:materials International 2007年第11期17卷 1334-1340页

作者： Pan Baotian, Liu Xiaofeng, Gao Hongshan, Wang Yong and Li Jijun(key laboratory of Western china’s Environmental System, {3. of education, lanzhou university, lanzhou 73.000, china) key laboratory of Western china’s Environmental System Ministry of Education Lanzhou University Lanzhou 730000 China

Seven terraces along the Weihe River in Longxi basin have been investigated. These terraces all consist of archetypal duality in structure, namely the floodplain deposits and the layer of gravels overlaid by varying thickness of the loess. By resorting to various dating approaches such as palaeomagnetic, optically stimulated luminescenece (OSL), 14C and loess-paleosol sequence, we provide preliminary timing of these seven terraces along upper Weihe River. Analysis on sedimentation characteristics and dating of these terraces showed that seven terraces may be jointly generated by tectonic uplifts and climatic changes. Tectonic uplifts may accommodate initial river incision, and climatic change may be responsible for processes of subsequent channel widening and aggradation. Aggradation normally occurs during glacial periods, in contrast to down-cuttings during transitions from glacial to interglacial period. Moreover, on the basis of the timings and heights of these terraces, we infer that the long-term rate of river incision was determined to be 0.2 m/kyr during the last 870 kyr, which differs from other river incision rates. This discrepancy may reflect spatio-temporal differentiation of tectonic activities in the Qinling orogenic belt during the Pleistocene.

关键词： loess stratigraphy river terraces climate change Upper Weihe River

Soft magnetic properties of (Ni_(50)Fe_(50)) SiO_2 granular thin films for high frequency application

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Rare Metals 2006年第z1期25卷 650-654页

作者： YANG Xiaolin GE Shihui RUAN Chengli College of Physics and Electronic Science University of Electronic Science and Technology of China Chengdu 610054 China Key Laboratory for Magnetism and Magnetic Materials of Ministry of EducationLanzhou University Lanzhou 730000 China College of Physics and Electronic Science University of Electronic Science and Technology of China Chengdu 610054 China

A series of (Ni50Fe50)x(SiO2)(1-x) films with different volume fraction x was fabricated by magnetron co-sputtering technique. The microstructure, magnetic and electrical properties were investigated systematically by using X-ray diffraction, transmission electronic microscope, vibrating sample magnetometer and the traditional four point measurement method of resistivity. The results show that the samples consist of nano-scaled Ni50Fe50 metallic particles with fcc structure uniformly embedded in amorphous insulating SiO2 matrix, and the particle size decreases with the decrease of x. The rapid change of coercivity with x is observed, and a minimum value 160 A·m-1 of Hc was obtained for the sample of x=0.83.with film thickness of 180 nm, which can be contributed to the exchange coupling between nano-scaled Ni50Fe50 particles. At the frequency lower than 1 GHz, the real part μ′ of complex permeability keeps about 110 and the image part μ″ is less than 15. Besides, this film exhibits high resistivity ρ=263.μΩ·cm, high saturation magnetization 4πMs=1.25 T, high in-plane magnetic anisotropy field Hk=6.3. kA·m-1, and the ferromagnetic resonance (FMR) frequency is estimated to be 2.8 GHz. Therefore, this film can be used in high frequency devices operating over 2 GHz.

关键词： thin films nanostructure magnetic properties

Effects of Current Frequency on the Microstructure and Wear Resistance of Ceramic Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation on AZ91D Magnesium Alloy

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Journal of materials Science & Technology 2010年第10期26卷 865-871页

作者： Yue Yang and Hua Wu key laboratory of Advanced Structural materials,{3. of education,Changchun university of Technology,Changchun 13.012,china [a] key laboratory of Advanced Structural materials ministry of education Changchun university of Technology Changchun 13.012 china

To improve the surface wear resistance of the ceramic coating fabricated by micro-arc oxidation （MAO） on AZ91D magnesium alloy,ceramic coatings embedded with SiC nano-particles at different current frequency （500 Hz,700 Hz,and 900 Hz） were produced during the MAO *** morphology and phase composition of the coatings were investigated by scanning electron microscopy （SEM）,field emission scanning electron microscopy （FESEM）,and X-ray diffraction （XRD）.The surface roughness of the coatings was characterized by confocal laser scanning microscopy （CLSM）.Simultaneously,the tribological properties of the composite coatings were evaluated by using a universal materials tester （UMT）.The results shows that the wear resistance of the ceramic coatings with SiC nano-particles was improved significantly compared to the ceramic coatings without SiC ***,the composite coating formed at current frequency 900 Hz showed the better wear resistance than the others.

关键词： Magnesium alloy Micro-arc oxidation SiC nano-particles Wear resistance

Effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses

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Progress in Natural Science:materials International 2012年第1期22卷 21-25页

作者： Chunyan Li a,Shengzhong Kou a,b,Yanchun Zhao a,Guangqiao Liu b,Yutian Ding a a State key laboratory of Gansu Advanced Non-ferrous Metal materials,{3. university of Technology,{3. 73.050,china b key laboratory of Non-ferrous Metal Alloys and Processing of the ministry of education,{3. university of Technology,{3. 73.050,china [a] State key laboratory of Gansu Advanced Non-ferrous Metal materials Lanzhou University of Technology Lanzhou 730050 China [b] key laboratory of Non-ferrous Metal Alloys and Processing of the ministry of {3. Lanzhou University of Technology Lanzhou 730050 China

The effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses has been *** specimens with the diameters of 3.mm,4 mm and 6 mm cut from the same ladder-shaped Zr 55 Al 10 Ni 5 Cu 3. BMG rod were used in the present *** experimental results indicated that the different plastic strains were induced for the three type compression *** compressive plastic strain increased with the decreasing diameter for the as-cast specimens,which means that the compressive plastic strain increased with the increasing cooling *** reason of the difference is attributed to the free volume existed in the BMGs during the rapid solidification,and the larger free volume was contained in the specimen fabricated with the higher cooling *** has been found that the prominent serrations and multiple shear bands appeared during the compressive deformation tests of the specimen with smaller diameter of 3.mm,indicating that the specimen with smaller diameter exhibits better plasticity due to more free volume content.

关键词： Bulk metallic glasses Cooling rate Serration Plastic deformation Free volume

Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in lanzhou area

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Progress in Natural Science:materials International 2007年第2期17卷 197-205页

作者： PAN Baotian , SU Huai, HU Chunsheng, HU Xiaofei, ZHOU Tian and LI Jijun (key laboratory of Western china’s Environmental Systems, {3. of education, and Department of Geography, lanzhou university, lanzhou 73.000, china) [a]ministry of Eduction Key Laboratory of Western China's Environmental Systems [b]Department of Geography Lanzhou University Lanzhou China

Based on the aeolian loess sequence-stratigraphic division and paleomagnetic datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive Yellow River incision event during that period. Results of paleomagnetic dating and optically stimulated luminescence (OSL) dating of the Wuyishan loess section and Zaoshugou loess section on the fourth Yellow River terrace (T4) show that the age of the fourth Yellow River terrace in lanzhou area is 0.86 Ma BP rather than the previously believed 0. 6 Ma BP. This result answers a long-term question in the ge-omorphology community of whether there exists a 0. 8 Ma terrace in lanzhou area. The discovery of the 1. 0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in lanzhou area provide new insights into further research on the evolution of Yellow River.

关键词： lanzhou area Yellow River terrace dating.

Terrace dating as an archive of the run-through of the Sanmen Gorges

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Progress in Natural Science:materials International 2005年第12期15卷 1096-1103页

作者： PAN Baotian,WANG Junping,GAO Hongshan,CHEN Yingying,LI Jijun and LIU Xiaofeng key laboratory of Western china’s Environmental Systems,{3. of education,and Department of Geography,lanzhou university,lanzhou 73.000,china key laboratory of Western china''s Environmental Systems Ministry of Education China. Department of Geography Lanzhou University Lanzhou 730000 China

Analysis of morphological properties in the Sanmen Gorges region of the Yellow River shows that four river terraces have been developed at the entrance to the ***,thick aeolian loess-paleosol sequence was deposited on the terraces,which makes it easy to date the *** dating of paleomagnetic,loess-paleosol sequence matching and thermoluminescence show that terraces T2,T3.and T4 were formed 0.129 Ma,0.625 Ma and 0.865 Ma ago,*** formation of these terraces in this region indicates that the Yellow River has experienced four intensive downcutting events during the last 0.9 *** Yellow River cut through the Sanmen Gorges and inpoured into the East china Sea no later than 0.865 Ma.

关键词： river terrace paleomagnetic dating Yellow River loess

Effect of TRT process on GFA,mechanical properties and microstructure of Zr-based bulk metallic glass

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Progress in Natural Science:materials International 2011年第1期21卷 53-58页

作者： Guang-qiao LIU~1,Sheng-zhong KOU~(1,2),Chun-yan LI~1,Yan-chun ZHAO~1,Hong-li SUO~2 1.State key laboratory of Gansu Advanced Non-ferrous Metal materials,{3. of Technology,lanzhou 73.050,china 2.The key laboratory of Advanced Functional materials(ministry of education), Beijing university of Technology,Beijing 100022,china [a] State key laboratory of Gansu Advanced Non-ferrous Metal materials Lanzhou University of Technology Lanzhou 730050 China [b] The key laboratory of Advanced Functional materials ({3. of education) Beijing University of Technology Beijing 100022 China

Series of rod samples of Zr55Al10Ni5Cu3. alloy were prepared by magnetic suspend melting and copper mold suction casting *** effect of thermal rate treatment（TRT） process on glass forming ability（GFA）,mechanical properties and microstructure of Zr-based bulk metallic glass were *** shows that GAF,mechanical properties and microstructure of as-cast Zr55Al10Ni5Cu3. BMGs alloy to a large extent is related to TRT *** and thermal stability of as-cast Zr55Al10Ni5Cu3. alloy increase when overheating temperature *** liquid region△Txand parameterγincrease from 73.K to 89 K,from 0.413.to 0.417,respectively,when casting voltage increases from 7 kV to 10 *** a threshold overheating temperature is found for the fully amorphous structure,below which it may have an intersection with the crystallization *** is found that the compressive strength increases and the compressive plasticity slightly decreases when overheating temperature ***,the compressive strength and the compressive plasticity simultaneously increase to 1.91 MPa and 2%when casting voltage increases to 10 kV.

关键词： bulk metallic glass glass forming ability(GFA) mechanical properties thermal rate treatment(TRT) process microstructure