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Search Results: 1 - 10 of 196598 matches for " Y.H Long "
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PREDICTION OF BIOAVAILABILITY OF CHLORPYRIFOS RESIDUES IN SOIL TO EARTHWORMS
X.M Wu,Y.L Yu,M Li,Y.H Long
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: An incubation test was conducted to investigate the effect of aging on bioavailability of chlorpyrifos in soil and to assess the feasibility of chemical extraction techniques for predicting bioavailability of chlorpyrifos in soil. Chlorpyrifos was spiked into sterilized soil and aged in microcosms for up to 120 days. The earthworms were incubated in the spiked soils, at 0, 7, 14, 30, 60, and 120 days after spiking, for a period of 7 days. After exposure, chlorpyrifos concentrations in the earthworm tissues were determined. Change in chemical extractability of soil-chlorpyrifos was measured using a several solvent systems including methanol, methanol-water (9:1), acetone-water (5:3), and water. The results show that chemical extractability and earthworm bioavailability of chlorpyrifos in soil decreased with aging. The amount of aged and unaged chlorpyrifos recovered from soil varied with the individual chemical extractant and extraction method. Concentrations of chlorpyrifos in Eisenia foetida were significantly higher than in Allolobophora caliginosa, suggesting that the bioavailability of chlorpyrifos was a species-dependent process. The extractability of chlorpyrifos by chemical solvents was significantly correlated with bioavailability fraction of E. foetida and A. caliginosa, showing that these extraction techniques may be efficient for predicting bioavailability of chlorpyrifos in soil.
Effects of adsorption on degradation and bioavailability of metolachlor in soil
X.M Wu,M Li,Y.H Long,R.X Liu
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. Metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 μg1-n mLn g-1, suggesting its potential to move downward with percolating water. Adsorption followed a Freundlich isotherm and was positively correlated with soil organic matter (OM) content (p < 0.01). Degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil OM content (p < 0.01). The prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. Uptake and bioaccumulation of metolachlor in soils by Eisenia foetida was also mainly controlled by soil properties, especially OM. Adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
GROWTH AND DEVELOPMENT OF MUSCLES, BONES AND FAT OF GUINEA FOWL (NUMIDA MELIAGRIS GALEATA)
Y.H. ELHASHMI
Online Journal of Animal and Feed Research , 2012,
Abstract: This study was conducted to evaluate the growth pattern of muscles, bones and fat of guinea fowl. Eighteen day old chicks were reared for 22 weeks and serial slaughters were done every four weeks for evaluation. Results showed that the feed conversion ratio was 1:5, highest feed intake at 13-14 weeks of age and highest weight gain at 8-10 weeks. Carcass yield was 69%. The great mass of muscle was found in the thorax, highest bone percentage was found in the pelvis and the flank had high percentage of fat. Thorax and hind limb had high growth rate when compared with pelvis, wing, neck and flank.
Ballistic spin filtering across the ferromagnetic-semiconductor interface
Y.H. Li
Condensed Matter Physics , 2012,
Abstract: The ballistic spin-filter effect from a ferromagnetic metal into a semiconductor has theoretically been studied with an intention of detecting the spin polarizability of density of states in FM layer at a higher energy level. The physical model for the ballistic spin filtering across the interface between ferromagnetic metals and semiconductor superlattice is developed by exciting the spin polarized electrons into n-type AlAs/GaAs superlattice layer at a much higher energy level and then ballistically tunneling through the barrier into the ferromagnetic film. Since both the helicity-modulated and static photocurrent responses are experimentally measurable quantities, the physical quantity of interest, the relative asymmetry of spin-polarized tunneling conductance, could be extracted experimentally in a more straightforward way, as compared with previous models. The present physical model serves guidance for studying spin detection with advanced performance in the future.
PREDICTION OF BIOAVAILABILITY OF CHLORPYRIFOS RESIDUES IN SOIL TO EARTHWORMS
Wu,X.M; Yu,Y.L; Li,M; Long,Y.H; Fang,H; Li,S.N;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000100004
Abstract: an incubation test was conducted to investigate the effect of aging on bioavailability of chlorpyrifos in soil and to assess the feasibility of chemical extraction techniques for predicting bioavailability of chlorpyrifos in soil. chlorpyrifos was spiked into sterilized soil and aged in microcosms for up to 120 days. the earthworms were incubated in the spiked soils, at 0, 7, 14, 30, 60, and 120 days after spiking, for a period of 7 days. after exposure, chlorpyrifos concentrations in the earthworm tissues were determined. change in chemical extractability of soil-chlorpyrifos was measured using a several solvent systems including methanol, methanol-water (9:1), acetone-water (5:3), and water. the results show that chemical extractability and earthworm bioavailability of chlorpyrifos in soil decreased with aging. the amount of aged and unaged chlorpyrifos recovered from soil varied with the individual chemical extractant and extraction method. concentrations of chlorpyrifos in eisenia foetida were significantly higher than in allolobophora caliginosa, suggesting that the bioavailability of chlorpyrifos was a species-dependent process. the extractability of chlorpyrifos by chemical solvents was significantly correlated with bioavailability fraction of e. foetida and a. caliginosa, showing that these extraction techniques may be efficient for predicting bioavailability of chlorpyrifos in soil.
Theoretic and Numerical Study of a New Chaotic System  [PDF]
C.X. Zhu, Y.H. Liu, Y. Guo
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.22013
Abstract: This paper introduced a new three-dimensional continuous quadratic autonomous chaotic system, modified from the Lorenz system, in which each equation contains a single quadratic cross-product term, which is different from the Lorenz system and other existing systems. Basic properties of the new system are analyzed by means of Lyapunov exponent spectrum, Poincaré mapping, fractal dimension, power spectrum and chaotic behaviors. Furthermore, the forming mechanism of its compound structure obtained by merging together two simple attractors after performing one mirror operation has been investigated by detailed nu-merical as well as theoretical analysis. Analysis results show that this system has complex dynamics with some interesting characteristics.
Jesus the ‘teacher-saviour’ or ‘saviour-teacher’: Reading the Gospel of Matthew in Chinese contexts
John Y.H. Yieh
HTS Theological Studies/Teologiese Studies , 2009, DOI: 10.4102/hts.v65i1.317
Abstract: While every interpretation is culturally particular and context-specific, the critical assessment of the hermeneutical principles and social consequences of real examples from different cultures may facilitate fresh readings of the scripture with more creative imagination, theological integrity and ethical responsibility. This essay investigates three influential interpretations of Matthew’s Gospel by well-known Christian leaders in China: Hong Xiuquan, Wu Leichuan and Watchman Nee. Different theological orientations notwithstanding, they all highlight Jesus’ role as ‘saviour and teacher’ and favour the Sermon on the Mount. The strategies that they use to appropriate Matthew’s Gospel and to make Jesus relevant show what it takes to ensure a sound hermeneutical process. They also bring to the table of Matthean scholarship insight into the roles that Jesus plays in the Gospel narrative and in various socio-cultural settings. Finally, they provide interesting cases for a brief refl ection on cross-cultural readings and post-colonial criticism that have fascinated recent biblical scholars. How to cite this article: Yieh, J.Y.H., 2009, ‘Jesus the “teacher-saviour” or “saviour-teacher”: Reading the Gospel of Matthew in Chinese contexts’, HTS Teologiese Studies/Theology Studies 65(1), Art. #317, 10 pages. DOI: 10.4102/hts.v65i1.317
Effects of adsorption on degradation and bioavailability of metolachlor in soil
Wu,X.M; Li,M; Long,Y.H; Liu,R.X; Yu,Y.L; Fang,H; Li,S.N;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000300007
Abstract: the ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. the present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 μg1-nmlng-1, suggesting its potential to move downward with percolating water. adsorption followed a freundlich isotherm and was positively correlated with soil organic matter (om) content (p < 0.01). degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil om content (p < 0.01). the prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. uptake and bioaccumulation of metolachlor in soils by eisenia foetida was also mainly controlled by soil properties, especially om. adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
Stroke Prevention in Atrial Fibrillation: Where are We Now?
Yousif Ahmad and Gregory Y.H. Lip
Clinical Medicine Insights: Cardiology , 2012, DOI: 10.4137/CMC.S8976
Abstract: Atrial fibrillation is the commonest arrhythmia worldwide and is a growing problem. AF is responsible for 25% of all strokes, and these patients suffer greater mortality and disability. Warfarin has traditionally been the only successful therapy for stroke prevention, but its limitations have resulted in underutilisation. Major progress has been made in AF research, leading to improved management strategies. Better risk stratification permits identification of truly low-risk patients who do not require anticoagulation and we are able to simplify ourevaluation of a patient's bleeding risk. The advent of novel anticoagulants means warfarin is no longer the only choice for stroke prophylaxis. These drugs circumvent many of warfarin's inconveniences, but onlylong-term study and use will conclusively demonstrate how they compare to warfarin. The landscape of stroke prevention in AF has changed with effective alternatives to warfarin available for the first time in 60 years—but each new option brings new considerations.
Adolescents’ physical activity and its related cognitive and behavioural processes
J Hwang,Y.H. Kim
Biology of Sport , 2011,
Abstract: The purpose of the study was to examine adolescents’ physical activity and identify differences in cognitive and behavioural processes according to the stages of physical activity. Participants were 13 to 18 year old students (n = 851, male = 479, female = 372, mean age = 16.0 years) from 5 junior high and high schools who completed measures of the stages of physical activity and change process. The results indicated that 66.2% of adolescents reported being completely inactive (pre contemplation or contemplation) or undertaking physical activity irregularly (preparation). There were significant differences in the stages of physical activity between sexes; male adolescents were more active than females. In addition, cognitive and behavioural processes were significantly associated with stages of physical activity. Specifically, consciousness raising and environmental re evaluation in the cognitive processes differentiated the stages of physical activity. Meanwhile, all four sub-constructs in the behavioural processes continually increased with each subsequent stage. The present study provides convincing evidence that promoting and maintaining physical activity require the practical application of cognitive and behavioural strategies.
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