4,775 research outputs found
A Thermal Degradation Study of Insulation Materials Extruded Polystyrene
AbstractThis paper presents a research on the thermal degradation of typical polymer insulation materials extruded polystyrene (XPS) under both oxidizing gas air and non-oxidizing gas nitrogen. The Kissinger-Akahira-Sunose method was employed to calculate the activation energy values according to thermogravimetic analysis (TGA) results. Thermal degradation characteristics of XPS were studied by using thermogravimetry and differential scanning calorimetry (TG-DSC) hyphenated technique. XPS follows a two-stage and three-stage weight loss during the entire process under nitrogen and air, respectively. Evolved products of XPS and the degradation mechanism in helium were investigated with pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) method. The results reveal that styrene monomers are the dominate products of XPS degradation. Methylbenzene, α-methyl styrene, dimer and some other oligmers of styrene are also detected
The Behavioral Ecology of the Tibetan Macaque
This open access book summarizes the multi-disciplinary results of one of China’s main primatological research projects on the endemic Tibetan macaque (Macaca thibetana), which had continued for over 30 years, but which had never been reported on systematically. Dedicated to this exceptional Old World monkey, this book makes the work of Chinese primatologists on the social behavior, cooperation, culture, cognition, group dynamics, and emerging technologies in primate research accessible to the international scientific community
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Structure and function of hydrogenase from Azotobacter vinelandii
Localized States and Quantum Spin Hall Effect in Si-Doped InAs/GaSb Quantum Wells
We study localized in-gap states and quantum spin Hall effect in Si-doped
InAs/GaSb quantum wells. We propose a model describing donor and/or acceptor
impurities to describe Si dopants. This model shows in-gap bound states and
wide conductance plateau with the quantized value in light dopant
concentration, consistent with recent experiments by Du et al. We predict a
conductance dip structure due to backward scattering in the region where the
localization length is comparable with the sample width but much
smaller than the sample length .Comment: 4+pages main text including 4 figures, supplementary materials with 3
figures are include
Seasonal Variation and Synchronization of Sexual Behaviors in Free-Ranging Male Tibetan Macaques (Macaca thibetana) at Huangshan, China
Although seasonal breeding has been documented in many non-human primates, it is not clear whether sexual behaviors show seasonal variation among male individuals. To test this hypothesis, the focal animal sampling method and continuous recording were used to investigate seasonal variation and synchronization of sexual behaviors in five male Tibetan macaques (Macaca thibetana) at Mt. Huangshan from Oct 2005 to Sept 2006. Both copulatory and sexually motivated behaviors (i.e., sexual chase, grimace, and sexual-inspection), which were significantly higher in the mating season than non-mating season. Furthermore, seasonal variations of sexual behaviors, including copulatory and sexually motivated behaviors, were synchronized among males. The results shed light on sexual competition and tactics for reproductive success of male M. thibetana and other non-human primates with seasonal breeding
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