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Now showing items 33 - 48 of 378

  • Reduction of Threading Dislocation Density in AlGaN by Indium Incorporation

    Kang, H.   Feng, Z. C.   Ferguson, I.   Guo, S. P.   Pophristic, M.  

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  • Redeeming Immigrant Parents: How Korean American Emerging Adults Reinterpret Their Childhood

    Kang, H.   Okazaki, S.   Abelmann, N.   Kim-Prieto, C.   Shanshan Lan,  

    Korean American youth experience immigration-related parent-child challenges including language barriers, parent-child conflicts, and generational cultural divides. Using grounded theory methods, this article examines the ways in which 18 Korean American college-enrolled emerging adults retrospectively made sense out of their experiences of immigrant family hardships. Of those who narrated childhood hardship, over half narrated positive change in which they reinterpreted their relationship to their parents and redeemed their immigrant parents either through their own maturation or through spirituality. This narrative strategy is consistent with cognitive change in emerging adults' view of their parents that have been documented in other studies (Arnett, 2004). Only a minority of participants did not narrate positive changes and remained distressed over their relationship to their parents. Findings suggest the possibility that narration of positive change is a culturally salient process by which many Korean American emerging adults come to terms with early family challenges.
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    Kim, A.   Lee, H.   Kang, H.  

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  • Glucose metabolism and oscillatory behavior of pancreatic islets

    Kang, H.   Jo, J.   Kim, H. J.   Choi, M. Y.   Rhee, S. W.   Koh, D. S.  

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  • Bacillus songklensis sp. nov., isolated from soil

    Kang, H.   Weerawongwiwat, V.   Kim, J.-H.   Sukhoom, A.   Kim, W.  

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  • Survival characteristics of Salmonella enterica serovar Enteritidis in chicken egg albumen

    KANG, H.   LOUI, C.   CLAVIJO, R. I.   RILEY, L. W.   LU, S.  

    Salmonella enterica serovar Enteritidis (SE) is a major foodborne pathogen primarily causing human infection through contaminated chicken eggs. To understand how SE survives in chicken egg albumen, we systematically and quantitatively analysed the survival properties of SE in egg albumen and identified factors affecting its survival. Survival assays of SE in egg indicate that egg albumen restricted the growth of SE. A major factor that controlled SE's growth in egg albumen was iron restriction, since egg albumen supplemented with iron allowed SE to grow, and iron acquisition mutants of SE showed decreased survival in egg albumen. In addition, low pH of albumen, high concentrations of bacteria and low incubation temperatures of bacteria with albumen facilitates the survival of SE. Our results suggest that egg albumen uses multiple mechanisms to control SE including iron limitation, surface interaction and possible enzymatic activities.
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  • Evaluation of multiaxial spot weld fatigue parameters for proportional loading

    Kang, H.   Barkey, M.E.   Lee, Y.  

    The authors have conducted set of experiments to study the effects of combined tension and shear loads on the fatigue life of spot welded joints. The fatigue life of the specimens depended on the applied load amplitude, the ratio of shear to normal loading, and spot weld nugget diameter. The lower load amplitudes had longer fatigue lives, as did the cases which contained a higher amount of shear loading and specimens with a larger nugget diameter. Based on the test results, Swellam and co-workers' model, Sheppard's model, Rupp and co-workers' model, and an interpolation/extrapolation model are evaluated. The four approaches were correlated with the experimental fatigue life for the multiaxial test results with reasonable accuracy. The success of Swellam and co-workers' method relies heavily on determining the appropriate parameters β and b0. Sheppard's structural stress method agreed reasonably well for mutiaxial test results, although the maximum structural stress range is sensitive to the variation of the sheet thickness, and the determination of ΔM* is a complex procedure. Rupp and co-workers' method is suitable for application to large structural models because mesh refinement is not necessary for modeling the spot weld connection.
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  • Small molecule-driven direct conversion of human pluripotent stem cells into functional osteoblasts

    Kang, H.   Shih, Y.-R. V.   Nakasaki, M.   Kabra, H.   Varghese, S.  

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  • Fluid shear stress modulates endothelial cell invasion into three-dimensional collagen matrices

    Kang, H.   Bayless, K. J.   Kaunas, R.  

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  • X-Ray Diffraction Analysis of GaN and AlGaN

    Kang, H.   Spencer, N.   Nicol, D.   Feng, Z. C.   Ferguson, I.   Guo, S. P.   Pophristic, M.   Peres, B.  

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  • BRG1 Controls the Activity of the Retinoblastoma Protein via Regulation of p21CIP1/WAF1/SDI

    Kang, H.   Cui, K.   Zhao, K.  

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  • Hedgerow Pruning Effects on Light Interception, Water Relations and Yield in Alley-Cropped Maize

    Kang, H.   Shannon, D. A.   Prior, S. A.   Arriaga, F. J.  

    In alley cropping, trees and crops compete for light, nutrients, and water. However, there is little information on how hedgerow pruning would impact light interception, water relations, and yield in a maize (Zea mays L.)-mimosa (Albizia julibrissin Durazz) alley-cropping system. Competition between mimosa hedgerows and maize was measured under alley cropping on a compass loam sand in Shorter, AL. Treatments were established in a randomized complete block design and consisted of no pruning or pruning at 30, 30 + 60 and 30 + 90 days after maize planting (DAP) and at 5 cm and 50 cm pruning heights. To minimize competition for nutrients, 199 kg N ha(-1), 9 kg P ha(-1), and 73 kg K ha- I were applied. Reduction in photosynthetically active radiation (PAR) was assessed periodically. Water status in maize was assessed using a steady state porometer to measure maize leaf stomatal conductance and transpiration rate. PAR was lower in maize rows closest to hedgerows (ROW]) than in second maize rows from hedgerows (ROW2) especially after 60 DAP. After the 90 DAP pruning, 30 + 90 DAP pruning treatment gave significantly lower stomatal conductance (CD) and transpiration rate (TR) in maize leaves than did 30 DAP or 30 + 60 DAP treatments. ROW] had high CD and TR, which suggests greater water loss that might reduce final yields. Pruning increased PAR, maize grain and stover yields compared to no-pruning plots. Pruning twice gave higher grain and stover yields than did no-pruning controls. Pruning at 5 cm height gave higher maize yield than pruning at 50 cm. On average, ROW I had 24% lower yield than did ROW2. Interaction of treatment by row was highly significant. Yield in ROW I was more affected by pruning treatments than in ROW2. After 90 DAP, 30 + 90 DAP pruning treatment had lowest shade, followed by pruning treatment 30 + 60 DAP at 5 cm height. Pruning at 90 DAP and pruning at 5 cm height reduced competition for water and light. Hedgerow pruning can increase light interception and reduce water stress in the maize crop.
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  • Application of Antisense and Ribozyme In Controlling The Viral Replication

    Kang, H.   Sung, D.  

    In an attempt to develop efficient way to inhibit the propagation of plant viruses, antisense RNA and ribozyme targeted to the frameshifting site of the plant viruses were designed and their activities were tested using the luciferase reporter system. A 17mer RNA complementary to the RNA sequence including the frameshifting site of the Barley Yellow Dwarf Virus (BYDV) completely arrests the translation of luciferase gene. This inhibitory effect is dependent on the concentration of the antisense RNA. A 36mer hammerhead ribozyme was designed to cleave the RNA at the frameshifting site. Translation of the luciferase gene is arrested by the ribozyme. In order to test the efficacy of the antisense and ribozyme in vivo, a yeast expression system using pYES2 vector was designed. The genes coding the antisense and/or ribozyme were cloned into the Pvu II / Sph I site of the pYES2, which is expressed under the control of the GAL1 promoter. The pYES2 vector was co-transfected into the yeast with the pAS2-1 vector carrying the frameshifting assay cassette of the BYDV. Analysis of the protein products by Western Blotting reveals that antisense and ribozyme completely inhibit the translation of the messenger RNA beyond the target site. Our results indicate that frameshifting site in viruses is a good target site for antisense and ribozyme, which is a potential way to inhibit the viral propagation.
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  • Changes of Soil Enzyme Activities By Simulated Acid and Nitrogen Deposition

    Kang, H.   Lee, D.  

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  • P2.13-004 Role of Low-Dose Chest Computerized Tomography in Lung Cancer Screening among Never-Smokers

    Kang, H.   Lee, C.  

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  • Contributions to the cosmic ray flux above the ankle: clusters of galaxies

    Kang, H.   Rachen, J. P.   Biermann, P. L.  

    Motivated by the suggestion of Kang, Ryu & Jones that particles can be accelerated to high energies via diffusive shock acceleration processes at the accretion shocks formed by the infalling flow toward clusters of galaxies, we have calculated the expected particle flux from a cosmological ensemble of clusters. We use the observed temperature distribution of local clusters and assume a simple power-law evolutionary model for the comoving density of the clusters. The shock parameters, such as the shock radius and velocity, are deduced from the intracluster medium (ICM) temperature using the self-similar solutions for secondary infall on to the clusters. The magnetic field strength is assumed to be in equipartition with the postshock thermal energy behind the accretion shock. We also assume that the injected energy spectrum is a power law with the exponential cut-off at the maximum energy which is calculated from the condition that the energy gain rate for diffusive shock acceleration is balanced by the loss rate due to the interactions with the cosmic background radiation. In contrast to the earlier paper, we have adopted here the description of the cosmic ray diffusion by Jokipii which leads to considerably higher particle energies. Finally, the injected particle spectrum at the clusters is integrated over the cosmological distance to Earth by considering the energy loss due to the interactions with the cosmic background radiation. Our calculations show that the expected spectrum of high-energy protons from the cosmological ensemble of the cluster accretion shocks could match well the observed cosmic ray spectrum near 10(19) eV with reasonable parameters and models if about 10(-4) of the infalling kinetic energy can be injected into the intergalactic space as high-energy particles.
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