339 Result(s)
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Article
**yuan Ren
English
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Article
Deep Levels in Superlattices
The physics of deep levels in semiconductors is reviewed, with emphasis on the fact that all substitutional impurities produce deep levels - some of which may not lie within the fundamental band gap. The chara...
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Deep levels in superlattices
The physics governing deep levels in superlattices and quantum wells is elucidated, with emphasis on the importance of shallow-deep transitions caused by a band edge passing through a deep level, and the accom...
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A Study on the Blends of Epoxy/Polybutadiene and the Application to the Encapsulation of a Capacitor
This paper describes the blends of epoxy/polybutadiene and the application of the blends to the encapsulation of capacitors. Experiments showed that the hydroxy-carboxyl terminated polybutadiene (HCTPB) had a ...
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GaN/AℓxGa1-xN Wurtzite Semiconductor Superlattices
A theory of electronic structures of NGaNxNAℓGaN GaN/AℓxGa1-xN wurtzite semiconductor superlattices (grown in the direction of the c-axis) is developed and used to predict the superlattices’ band structures, ener...
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Deep Levels in Type-II Superlattices
Quantum confinement in superlattices affects shallow levels and band edges considerably (length scale of order 100 Å), but not deep levels (length scale of order 5 Å). Thus by band-gap engineering, one can mov...
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Electronic Structure of Si Doped by Rare-Earth Yb3+
The electronic structure of Yb3+-doped Si is elucidated in terms of level repulsion between the Si vacancy's deep levels (and spectral density) and the Yb3+ levels, both for bulk Si and for small clusters. The 2F
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Presynaptic muscarinic receptors modulate acetylcholine release from rat antral mucosal/submucosal nerves
The purpose of the present studies was to determine whether autoinhibition of acetylcholine release could be demonstratedin vitro from mucosal/submucosal neurons in rat antrum. Rat antral mucosal/submucosal tissu...
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Role of interfacial-charge in the growth of GaN on α-SiC
The growth of GaN and A1N films on (0001) substrates of 6H-SiC has produced high-quality opto-electronic films. The SiC surface at the interface with GaN or A1N is either Si-terminated or C-terminated, and the...
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Photoconductivity of [60]fullerene derivatives
Two [60]fullerene derivatives (compounds 1 and 2) have been synthesized. Their redox properties have been measured by cyclic voltammetry. The photoconductivities of poly(N-vinylcarbazole) (PVK) doped with [60]...
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Involvement of Capsaicin-Sensitive Sensory Neurons in Stress-Induced Gastroduodenal Mucosal Injury in Rats
The pathogenesis of stress-induced gastroduodenal mucosal injury is complex and incompletely understood. The aim of this investigation was to examine the involvement of gastric and duodenal capsaicin-sensitive...
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Magnetic moment distributions in α- Fe nanowire array
α-Fe nanowire array has been electrodeposited into anodic aluminum oxide template. The magnetic moment distributions, in the interior and near the extremities of α-Fe nanowire with 60 nm in diameter, have been...
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Calcitonin inhibits prolactin promoter activity in rat pituitary GGH3 cells
Previous findings from our laboratory have shown that pituitary calcitonin-like peptide (pit-CT) is synthesized and released by gonadotrophs and inhibits prolactin (PRL) release, synthesis, and lactotroph prol...
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Thermostable esterase from Thermoanaerobacter tengcongensis: high-level expression, purification and characterization
The lipA gene encoding a thermostable esterase was cloned from Thermoanaerobacter tengcongensis and overexpressed in Escherichia coli. The recombinant esterase, with a molecular mass of approx. 43 kDa determined ...
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Fabrication and magnetic properties of Co nanowire arrays of different crystal structures
Co nanowire arrays of different crystal structures have been electrodeposited into self-assembled anodic aluminum oxide (AAO) templates by varying pH value of electrolyte. The XRD results show that crystal str...
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Gene expression and molecular characterization of a thermostable trehalose phosphorylase fromThermoanaerobacter tengcongensis
A gene encoding the trehalose phosphorylase (TreP), which reversibly catalyzes trehalose degradation and synthesis from α-glucose-1-phosphate (α-Glc-1-P) and glucose, was cloned fromThermoanaerobacter tengcongens...
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The chemical structure of the Hawaiian mantle plume
The Hawaiian–Emperor volcanic island and seamount chain is usually attributed to a hot mantle plume, located beneath the Pacific lithosphere, that delivers material sourced from deep in the mantle to the surface1
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Endohedral Complex of Fullerene C60 with Tetrahedral N4, N4@C60
B3LYP/6-31G(d) hybrid HF/DFT and BLYP/6-31G(d, p) DFT calculations were carried out to determine the structural and electronic properties of the endohedral complex of C60 with Tetrahedral N4 (T
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Particle Swarm Optimization based predictive control of Proton Exchange Membrane Fuel Cell (PEMFC)
Proton Exchange Membrane Fuel Cells (PEMFCs) are the main focus of their current development as power sources because they are capable of higher power density and faster start-up than other fuel cells. The hum...
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The causes of land landscape changes in semi-arid area of Northwest China: A case study of Yulin city
Rapid land landscape change has taken place in many arid and semi-arid regions such as the vulnerable ecological area over the last decade. In this paper, we quantified land landscape change of Yulin in this a...
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Quantitative analysis of the dynamic change and spatial differences of the ecological security: a case study of Loess Plateau in northern Shaanxi Province
Using the theory and method of the ecological footprint, and combining the changes of regional land use, resource environment, population, society and economy, this paper calculated the ecological footprint, e...
