Suzhou, China
Suzhou, China

Tibet University is the largest university in Tibet. It has two campuses: one in Lhasa and one in Nyingchi. Wikipedia.


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Wen J.,Smithsonian Institution | Zhang J.-Q.,Peking University | Nie Z.-L.,CAS Kunming Institute of Botany | Zhong Y.,Tibet University | And 2 more authors.
Frontiers in Genetics | Year: 2014

The Qinghai-Tibetan Plateau (QTP) is the highest and one of the most extensive plateaus in the world. Phylogenetic, phylogeographic, and ecological studies support plant diversifications on the QTP through multiple mechanisms such as allopatric speciation via geographic isolation, climatic oscillations and divergences, pollinator-mediated isolation, diploid hybridization and introgression, and allopolyploidy. These mechanisms have driven spectacular radiations and/or species diversifications in various groups of plants such as Pedicularis L., Saussurea DC., Rhododendron L., Primula L., Meconopsis Vig., Rhodiola L., and many lineages of gymnosperms. Nevertheless, much work is needed toward understanding the evolutionary mechanisms of plant diversifications on the QTP. Well-sampled biogeographic analyses of the QTP plants in the broad framework of the Northern Hemisphere as well as the Southern Hemisphere are still relatively few and should be encouraged in the next decade. This paper reviews recent evidence from phylogenetic and biogeographic studies in plants, in the context of rapid radiations, mechanisms of species diversifications on the QTP, and the biogeographic significance of the QTP in the broader context of both the Northern and Southern Hemisphere biogeography. Integrative multidimensional analyses of phylogeny, morphological innovations, geography, ecology, development, species interactions and diversifications, and geology are needed and should shed insights into the patterns of evolutionary assembly and radiations in this fascinating region. © 2014 Wen, Zhang, Nie, Zhong and Sun.


Halvorsen J.A.,University of Oslo | Stern R.S.,Beth Israel Deaconess Medical Center | Dalgard F.,University of Oslo | Thoresen M.,University of Oslo | And 3 more authors.
Journal of Investigative Dermatology | Year: 2011

We performed a cross-sectional, questionnaire-based study to explore the relationship of suicidal ideation, mental health problems, and social functioning to acne severity among adolescents aged 18-19 years. A total of 4,744 youth were invited and 3,775 (80%) participated. In all, 14% reported having substantial acne (a lot and very much). Among those with very much acne, as compared those with no/little acne, suicidal ideation was twice as frequently reported among girls (25.5 vs. 11.9%) and three times more frequently reported among boys (22.6 vs. 6.3%). Suicidal ideation remained significantly associated with substantial acne (odds ratio 1.80, 95% confidence interval 1.30-2.50) in a multivariate model including adjustments of symptoms of depression, ethnicity, and family income. Mental health problems, as assessed by the Strengths and Difficulties Questionnaire (2.25, 1.69-3.00), low attachment to friends (1.52, 1.21-1.91), not thriving at school (1.41, 1.12-1.78), never having had a romantic relationship (1.35, 1.05-1.70), and never having had sexual intercourse (1.51, 1.21-1.89) were all associated with substantial acne in a multivariate model. Acne is frequently found in late adolescence and is associated with social and psychological problems. Adverse events including suicidal ideation and depression that have been associated with therapies for acne may reflect the burden of substantial acne rather than the effects of medication. © 2011 The Society for Investigative Dermatology.


Liu Z.L.,Tibet University
Advanced Materials Research | Year: 2014

In this paper, the mathematical model of eccentric follower cam contour and pressure angle was obtained from theoretical calculation, formulated the program diagram, and used MATLAB programming to realize the theoretical calculation. Through the analysis to influence of the base circle radius, eccentricity and lift angle to the maximum pressure angle of cam, proving that the maximum pressure angle could be controlled by the method of cam contour modeling based on MATLAB programming, and this method could realize the precise control to the maximum angle. © (2014) Trans Tech Publications, Switzerland.


Wang L.,Tibet University | Zeng X.,Tibet University
Proceedings of the 5th International Workshop on Signal Design and Its Applications in Communications, IWSDA'11 | Year: 2011

A new construction was proposed to design almost optimal sequence set with zero correlation zone(ZCZ). Based on the interleaved technique and recursive algorithm, a new ZCZ sequence set can be generated from an arbitrary perfect sequence, the length of which is longer than 4. And the ZCZ width and length of the new sequence can also be extended by recursive operation. The new sequence set can approach the mathematical bound, and can successfully provide CDMA communication without co-channel interference. © 2011 IEEE.


Liu Z.L.,Tibet University
Applied Mechanics and Materials | Year: 2014

The research object of this paper is one of the pressure steel pipes which is installed in hydropower station of agricultural and animal husbandry college, use the computational fluid dynamics software FLUENT to 3D numerical simulation for internal flow field of this pressure steel pipe, obtain the distribution of internal flow field and flow velocity. At the same time, analyze the bending position, verified the accuracy and rationality of the simulation. © (2014) Trans Tech Publications, Switzerland.


Liu Z.L.,Tibet University
Applied Mechanics and Materials | Year: 2014

In this paper, the study on 3D modeling and flow field simulation of Urea-SCR system which installed on the tested diesel engine. After the research of Urea-SCR reaction theory and the time scale of each physical and chemical reaction process, the numerical model of SCR system was established. Through the analysis of the factors such as velocity, temperature and pressure of flow field at characteristic operating points, verifying the reliability of the model, which has important guiding significance to the structure design of Urea-SCR system. © (2014) Trans Tech Publications, Switzerland.


Yan G.-Y.,Tibet University
Advanced Materials Research | Year: 2014

NiO-SiO2 composite photonic crystals were fabricated by the self assembly and the spin coating method. First, the SiO2 monodisperse colloidal spheres were fabricated by the Storber method and the opal structure was obtained by the vertical deposition method. After spin coating and sintering, the electrochromic material NiO was infiltrated in the opal template. The obtained NiO-SiO2 composite photonic crystal was characterized by X-ray diffraction (XRD), and the morphologies of SiO2 opals and the composite structures were characterized by SEM. The reflection spectra were measured and revealed that the periodic arrays exhibit a photonic band gap in the (111) direction. © (2014) Trans Tech Publications, Switzerland.


Yan G.-Y.,Tibet University
Applied Mechanics and Materials | Year: 2014

The uniform ZnO microsphere particles with a diameter of 390nm were synthesized by two-step method (also named seed solution method) projected by Eric W. Seelig. The chemical reaction details in the container were analyzed and the generation mechanism of ZnO microsphere particles was studied. ZnO films were prepared by vertical deposition. Coagulation phenomena occurred during the reaction process. The reaction conditions of coagulation phenomena were summarized and given reasonably explanations. © (2014) Trans Tech Publications, Switzerland.


For the sake of discussion to concentrating characteristics of multi dish concentrator, a simple calculation method of layout is given. By comparative study, the key of designing identical multi dish solar concentrator is confocal is deduced. In confocal and suitable f/D ratio conditions the smaller receiving aperture could be ensured, and the compound paraboloid receiver is not necessary. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Zhang Z.J.,Tibet University
Advanced Materials Research | Year: 2014

Based on the noise analysis of the photoelectric detection circuit, error compensation aiming at photoelectric detection circuit has been performed by making use of interpolation method, look-up table method, adaptive neuro-fuzzy inference method, and surface fitting method, so as to improve the accuracy of photoelectric detection as well as reducing the system error. In the meanwhile, the error compensation effects of different methods are compared and analyzed. Finally, with the help of the MATLAB software, these effects are simulated using the measured data of photoelectric diode experimental platform as the sample data. The result of the simulation indicates that the adaptive neuro-fuzzy inference method can improve the detection accuracy better and its error compensation effect is also better than that of interpolation method, look-up table method, and surface fitting method, when they are under the same conditions. © (2014) Trans Tech Publications, Switzerland.

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