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Search Results: 1 - 10 of 408382 matches for " Park J-H "
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Field Dependence of the Spin Relaxation Within a Film of Iron Oxide Nanocrystals Formed via Electrophoretic Deposition
Kavich DW,Hasan SA,Mahajan SV,Park J-H
Nanoscale Research Letters , 2010,
Abstract: The thermal relaxation of macrospins in a strongly interacting thin film of spinel-phase iron oxide nanocrystals (NCs) is probed by vibrating sample magnetometry (VSM). Thin films are fabricated by depositing FeO/Fe3O4 core–shell NCs by electrophoretic deposition (EPD), followed by sintering at 400°C. Sintering transforms the core–shell structure to a uniform spinel phase, which effectively increases the magnetic moment per NC. Atomic force microscopy (AFM) confirms a large packing density and a reduced inter-particle separation in comparison with colloidal assemblies. At an applied field of 25 Oe, the superparamagnetic blocking temperature is TBSP ≈ 348 K, which is much larger than the Néel-Brown approximation of TBSP ≈ 210 K. The enhanced value of TBSP is attributed to strong dipole–dipole interactions and local exchange coupling between NCs. The field dependence of the blocking temperature, TBSP(H), is characterized by a monotonically decreasing function, which is in agreement with recent theoretical models of interacting macrospins.
Endotoxin in dust and bronchial asthma
Das Undurti,Park J-H,Gold DR,Spiegelman DL
Respiratory Research , 2001, DOI: 10.1186/rr-2001-68504
Abstract:
Limited Phenotypic Effects of Selectively Augmenting the SMN Protein in the Neurons of a Mouse Model of Severe Spinal Muscular Atrophy
Andrew J-H. Lee, Tomoyuki Awano, Gyu-Hwan Park, Umrao R. Monani
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0046353
Abstract: The selective vulnerability of motor neurons to paucity of Survival Motor Neuron (SMN) protein is a defining feature of human spinal muscular atrophy (SMA) and indicative of a unique requirement for adequate levels of the protein in these cells. However, the relative contribution of SMN-depleted motor neurons to the disease process is uncertain and it is possible that their characteristic loss and the overall SMA phenotype is a consequence of low protein in multiple cell types including neighboring spinal neurons and non-neuronal tissue. To explore the tissue-specific requirements for SMN and, especially, the salutary effects of restoring normal levels of the protein to neuronal tissue of affected individuals, we have selectively expressed the protein in neurons of mice that model severe SMA. Expressing SMN pan-neuronally in mutant mice mitigated specific aspects of the disease phenotype. Motor performance of the mice improved and the loss of spinal motor neurons that characterizes the disease was arrested. Proprioceptive synapses on the motor neurons were restored and defects of the neuromuscular junctions mitigated. The improvements at the cellular level were reflected in a four-fold increase in survival. Nevertheless, mutants expressing neuronal SMN did not live beyond three weeks of birth, a relatively poor outcome compared to the effects of ubiquitously restoring SMN. This suggests that although neurons and, in particular, spinal motor neurons constitute critical cellular sites of action of the SMN protein, a truly effective treatment of severe SMA will require restoring the protein to multiple cell types including non-neuronal tissue.
Short Communication: Be careful for neglected diseases
J-H He
African Journal of Biotechnology , 2009,
Abstract: Neglected diseases boost (Nature, 457: 772, 2009), which will become greater threat to human health especially in tropical regions. In my opinion, it is the inherent result of climate warming. An allometrical scaling is suggested to support my opinion, this can also explain why swine flu does not affect pigs very much, but human beings fatally.
AFRIKAANS EN DIE EERSTE VRYHEIDSOORLOG
J-H Huisamen
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/11-1-645
Abstract: The role of AFRIKAANS (one of the two official languages of the Republic of South Africa), during 1880 - 1881 war between the Zuid-Afrikaansche Republiek and Britain is analysed. The origin of the language and the stages of development it went through, is discussed as well as its bitter struggle for survival. Aspects of particular importance are high-lighted and examples quoted that can be regarded as representative of each stage of development that AFRIKAANS went through in order to become an independent language.
Antioxidant activity of extracts from Acanthopanax senticosus
H-R Park, E Park, A-R Rim, K-I Jeon, J-H Hwang, S-C Lee
African Journal of Biotechnology , 2006,
Abstract: Antioxidants play an important role in inhibiting and scavenging radicals, thus providing protection to humans against infectious and degenerative diseases. Literature shows that the antioxidant activity is high in medicinal plants. Realizing the fact that, this study was carried out to determine the antioxidant activity of water extract of Acanthopanax senticosus. Water extract (0.5 g/50 ml) of A. senticosus (ASE) were prepared and total phenol contents (TPC) and radical scavenging activity (RSA) of the extracts was determined for antioxidant activity. The TPC and RSA of ASE were 366.67 M and 67.67%, respectively. In addition, the effect of ASE on DNA damage induced by H2O2 in human lymphocytes was also evaluated by Comet assay. The ASE showed strong inhibitory effect as its concentration increased from 0.125 to 1% by 65 to 81% against DNA damage induced by 200 M of H2O2. These results suggest that water extract of commercial dried A. senticosus for tea showed significant antioxidant activity and protective effect against oxidative DNA damage.
High Resolution Bulk Sensitive Photoemission Study of the Metal-Insulator Transition in (V,Cr)2O3 : Comparison to LDA+DMFT Theory
Hyeong-Do Kim,J-H. Park,J. W. Allen,A. Sekiyama,A. Yamasaki,K. Kadono,S. Suga,Y. Saitoh,T. Muro,P. Metcalf
Physics , 2001,
Abstract: %auto-ignore This paper has been withdrawn by the authors because its results have been superceded by new experimental data and new theory presented in S.-K. Mo et al., cond-mat/0212110.
The Aiding of MEMS INS/GPS Integration Using Artificial Intelligence for Land Vehicle Navigation
J-H. Wang,Y. Gao
IAENG International Journal of Computer Science , 2007,
Abstract:
Pacifying the Fermi-liquid: battling the devious fermion signs
J. Zaanen,F. Krueger,J-H She,D. Sadri
Iranian Journal of Physics Research , 2008,
Abstract: The fermion sign problem is studied in the path integral formalism. The standard picture of Fermi liquids is first critically analyzed, pointing out some of its rather peculiar properties. The insightful work of Ceperley in constructing fermionic path integrals in terms of constrained world-lines is then reviewed. In this representation, the minus signs associated with Fermi-Dirac statistics are self consistently translated into a geometrical constraint structure (the nodal hypersurface) acting on an effective bosonic dynamics. As an illustrative example we use this formalism to study 1+1-dimensional systems, where statistics are irrelevant, and hence the sign problem can be circumvented. In this low-dimensional example, the structure of the nodal constraints leads to a lucid picture of the entropic interaction essential to one-dimensional physics. Working with the path integral in momentum space, we then show that the Fermi gas can be understood by analogy to a Mott insulator in a harmonic trap. Going back to real space, we discuss the topological properties of the nodal cells, and suggest a new holographic conjecture relating Fermi liquids in higher dimensions to soft-core bosons in one dimension. We also discuss some possible connections between mixed Bose/Fermi systems and supersymmtery.
Assuring health and safety performance on construction projects: Clients’ role and influence
I Musonda, J-H Pretorius, CT Haupt
Acta Structilia , 2012,
Abstract: This article presents findings from an investigation conducted in Botswana and South Africa on how construction clients could influence health and safety (H&S) performance on construction projects. The continued poor state of construction H&S and the inability of designers and contractors to influence an industry-wide H&S culture change motivated the article. It was also recognised that one of the reasons the construction industry continued to lag in H&S performance was the way in which H&S implementation and management was organised. The article proposes a client-centred model for H&S performance improvement. The conceptual model and its factors were developed from both literature and a Delphi survey. Structural equation modelling was applied to data collected from a questionnaire survey to design a best fit model. The key finding was that, generally, client H&S culture impacted on project H&S performance. The influence of clients was found to be statistically significant when commitment, communication and H&S procedures were evident. This finding was encouraging as it specifically shows how clients could influence performance. However, it remains to be seen whether these results could be replicated in other datasets. If indeed that is the case, then this article contributes significantly to the body of knowledge.
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