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Search Results: 1 - 10 of 6846 matches for " Junhua Hou "
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Acoustic Polaron in Free-Standing Slabs  [PDF]
Junhua Hou, Guangming Si
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.44025
Abstract: The ground-state energy and its derivate of the acoustic polaron in free-standing slab are calculated by using the Huybrechts-like variational approach. The criteria for presence of the selftrapping transition of the acoustic polaron in free-standing slabs are determined qualitatively. The critical coupling constant for the discontinuous transition from a quasi-free state to a trapped state of the acoustic polaron in free-standing slabs tends to shift toward the weaker electronphonon coupling with the increasing cutoff wave-vector. Detailed numerical results confirm that the self-trapping transition of holes is expected to occur in the free-standing slabs of wide-bandgap semi-conductors.
Entropy, Free Radical and Life System  [PDF]
Honghu Li, Junhua Hou
Open Journal of Biophysics (OJBIPHY) , 2016, DOI: 10.4236/ojbiphy.2016.64009
Abstract: Effects of entropy and free radical in life system are elucidated. The results indicate that living organism can maintain normal activities only if a suitable free radicals inside living organism can be guaranteed. Excessive free radical should be eliminated to reduce entropy in living organism. Some ways provided to eliminate excessive free radical, reduce entropy and keep health.
Effective Mass of Acoustic Polaron in Quantum Dots  [PDF]
Hao Li, Junhua Hou, Xiaofeng Duan
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.51005
Abstract: The variational effective mass with respect to the e-p coupling constant for different values of cutoff wave vector is performed in quantum dot. The self-trapping transition of acoustic polaron in quantum dot is reconsidered by character of the effective mass curve varying with the e-p coupling. The holes are determined to be self-trapped in AlN quantum dot systems.
Facile growth of monocrystalline gold–iron nanocrystals by polymer nanoemulsion
HongLing Liu,WengXing Zhang,Peng Hou,JunHua Wu
Gold Bulletin , 2011, DOI: 10.1007/s13404-010-0003-4
Abstract: Monodisperse, monocrystalline AuFe optical–magnetic multifunctional nanocrystals were prepared by the nanoemulsion method using a copolymer surfactant. The structure and properties of the monocrystalline nanocrystals were analyzed by X-ray diffraction, transmission electron microscopy (TEM, including high-resolution TEM), selected-area electron diffraction, UV-vis spectroscopy, and vibration sampling magnetometry. The characterization shows the outstanding monodispersity and high monocrystallinity of the nanocrystals, which possess both well-defined optical and magnetic properties revealing broadband absorption with the surface plasmon resonance, peaking at ~600 nm, and clear soft ferromagnetic behavior at room temperature. Such long-term stable, monocrystalline AuFe nanocrystals have novel optical and magnetic properties, which may offer exciting opportunities in fundamental studies and tremendous applications.
Chunk Parsing and Entity Relation Extracting to Chinese Text by Using Conditional Random Fields Model  [PDF]
Junhua Wu, Longxia Liu
Journal of Intelligent Learning Systems and Applications (JILSA) , 2010, DOI: 10.4236/jilsa.2010.23017
Abstract: Currently, large amounts of information exist in Web sites and various digital media. Most of them are in natural lan-guage. They are easy to be browsed, but difficult to be understood by computer. Chunk parsing and entity relation extracting is important work to understanding information semantic in natural language processing. Chunk analysis is a shallow parsing method, and entity relation extraction is used in establishing relationship between entities. Because full syntax parsing is complexity in Chinese text understanding, many researchers is more interesting in chunk analysis and relation extraction. Conditional random fields (CRFs) model is the valid probabilistic model to segment and label sequence data. This paper models chunk and entity relation problems in Chinese text. By transforming them into label solution we can use CRFs to realize the chunk analysis and entities relation extraction.
The Construction of an Ecological College English Class on the Basis of the Task-based Language Teaching Method
Junhua Ren
Theory and Practice in Language Studies , 2011, DOI: 10.4304/tpls.1.2.184-186
Abstract: The Chinese college English class is inharmonious; therefore the ecology of the class is imbalanced which can be identified in the unequal relationship between the teacher and the students, the imbalanced quantity of “input” and “output”. The inharmonious class will discourage students to acquire English. In order to solve the problem the task-based language teaching method is adopted to construct a balanced ecological English class
An Analysis of Cohesion Achieved by Imperative Clause in English Netvertising
Junhua Ren
Theory and Practice in Language Studies , 2011, DOI: 10.4304/tpls.1.6.744-746
Abstract: The present study finds that imperative clause, which is ubiquitous in English netvertising, aids to make the discourse of a net ad cohesive in two ways: non-structure and structure. The former consists of reference, ellipsis and lexical cohesion. The latter refers to the chain of imperative clauses that forms a relation of co-classification.
Some $p$-ranks related to a conic in $PG(2,q)$
Junhua Wu
Mathematics , 2010,
Abstract: Let $\A$ be the incidence matrix of lines and points of the classical projective plane $PG(2,q)$ with $q$ odd. With respect to a conic in $PG(2,q)$, the matrix $\A$ is partitioned into 9 submatrices. The rank of each of these submatices over $\Ff_q$, the defining field of $PG(2,q)$, is determined.
Proofs of Two Conjectures On the Dimensions of Binary Codes
Junhua Wu
Mathematics , 2010,
Abstract: Let $\mathcal{L}$ and $\mathcal{L}_0$ be the binary codes generated by the column $\mathbb{F}_2$-null space of the incidence matrix of external points versus passant lines and internal points versus secant lines with respect to a conic in $PG(2, q)$, respectively. We confirm the conjectures on the dimensions of $\mathcal{L}$ and $\mathcal{L}_0$ using methods from both finite geometry and modular representation theory.
Climate Change Hastens the Conservation Urgency of an Endangered Ungulate
Junhua Hu, Zhigang Jiang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0022873
Abstract: Global climate change appears to be one of the main threats to biodiversity in the near future and is already affecting the distribution of many species. Currently threatened species are a special concern while the extent to which they are sensitive to climate change remains uncertain. Przewalski's gazelle (Procapra przewalskii) is classified as endangered and a conservation focus on the Qinghai-Tibetan Plateau. Using measures of species range shift, we explored how the distribution of Przewalski's gazelle may be impacted by projected climate change based on a maximum entropy approach. We also evaluated the uncertainty in the projections of the risks arising from climate change. Modeling predicted the Przewalski's gazelle would be sensitive to future climate change. As the time horizon increased, the strength of effects from climate change increased. Even assuming unlimited dispersal capacity of gazelles, a moderate decrease to complete loss of range was projected by 2080 under different thresholds for transforming the probability prediction to presence/absence data. Current localities of gazelles will undergo a decrease in their occurrence probability. Projections of the impacts of climate change were significantly affected by thresholds and general circulation models. This study suggests climate change clearly poses a severe threat and increases the extinction risk to Przewalski's gazelle. Our findings 1) confirm that endangered endemic species is highly vulnerable to climate change and 2) highlight the fact that forecasting impacts of climate change needs an assessment of the uncertainty. It is extremely important that conservation strategies consider the predicted geographical shifts and be planned with full knowledge of the reliability of projected impacts of climate change.
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