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Search Results: 1 - 10 of 146488 matches for " Pang B "
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SURFACE COLOUR CHANGE IN WOOD DURING DRYING ABOVE AND BELOW FIBRE SATURATION POINT
McCurdy,MC; Pang,S; Keey,R B;
Maderas. Ciencia y tecnología , 2006, DOI: 10.4067/S0718-221X2006000100004
Abstract: a technique, useful for studying the formation of kiln brown stain in wood drying, has been developed to measure the surface colour change in a single board wood sample during drying. the wood sample is planed carefully in the green state to remove any surface wood that was damaged during cutting. the intact tracheids at the surface cause the evaporative front to remain at the surface during drying and therefore colour formation also occurs right at the surface. in this way, the colour can be measured using a spectrophotometer at various stages during drying without having to slice the sample. experiments were carried out to measure the change in colour of wood from green to emc corresponding to the drying schedule used. at the end of each schedule the boards were held at the emc to determine how the colour changed below fibre saturation point. the results show that the colour of the wood continues to change below the fibre saturation point and the nature of the colour change indicates an increase in the complexity of the coloured compounds present. further experiments were done to measure the rate of colour development at different temperatures using the technique developed. the results have shown a correlation between temperature and colour development over the range 50°c to 70°c with the rate increasing significantly above 60°c
SURFACE COLOUR CHANGE IN WOOD DURING DRYING ABOVE AND BELOW FIBRE SATURATION POINT
MC McCurdy,S Pang,R B Keey
MADERAS : Ciencia y Tecnología , 2006,
Abstract: A technique, useful for studying the formation of kiln brown stain in wood drying, has been developed to measure the surface colour change in a single board wood sample during drying. The wood sample is planed carefully in the green state to remove any surface wood that was damaged during cutting. The intact tracheids at the surface cause the evaporative front to remain at the surface during drying and therefore colour formation also occurs right at the surface. In this way, the colour can be measured using a spectrophotometer at various stages during drying without having to slice the sample. Experiments were carried out to measure the change in colour of wood from green to EMC corresponding to the drying schedule used. At the end of each schedule the boards were held at the EMC to determine how the colour changed below fibre saturation point. The results show that the colour of the wood continues to change below the fibre saturation point and the nature of the colour change indicates an increase in the complexity of the coloured compounds present. Further experiments were done to measure the rate of colour development at different temperatures using the technique developed. The results have shown a correlation between temperature and colour development over the range 50°C to 70°C with the rate increasing significantly above 60°C
Variance Window Based Car License Plate Localization  [PDF]
Jing Pang
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29009
Abstract:

In this paper, a new method for discovering the candidate car license plate locations is presented. First, the image is decomposed using a Haar wavelet to get the HL band with vertical edges. Then, the HL band image is binarized using an Otsu threshold. Next a black top-hat algorithm is applied to reduce the effects of interfering large continuous features other than the license plate. At this time, a moving window based modified variance score calculation is made for areas with white pixels. This work found that the top 3 detected rectangle windows correctly locate the license plate regions with a success rate of about 98.2%. Moreover, the proposed method is robust enough to locate the plates in cases where the rough vehicle position has not been previously discovered and the cars are not centered in the image.

Research and Practice on the Cultivation of Engineering Competence for Software Talents in Universities  [PDF]
Xiyu Pang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.32020
Abstract: This paper analyzes the phenomenon that companies are in need of talents, yet students have difficulty in finding jobs. It proposes new solutions for “Bridging the gap between university education and social demand and cultivating qualified talents for software companies”, that is, to cultivate the students’ competence for software engineering in curriculum design. Besides, it gives a scheme for cultivating the students’ competence for software engineering in curriculum design, and delivers good results in practice.
Acute-Phase-HDL Remodeling by Heparan Sulfate Generates a Novel Lipoprotein with Exceptional Cholesterol Efflux Activity from Macrophages
Shui-Pang Tam, Robert Kisilevsky, John B. Ancsin
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0003867
Abstract: During episodes of acute-inflammation high-density lipoproteins (HDL), the carrier of so-called good cholesterol, experiences a major change in apolipoprotein composition and becomes acute-phase HDL (AP-HDL). This altered, but physiologically important, HDL has an increased binding affinity for macrophages that is dependent on cell surface heparan sulfate (HS). While exploring the properties of AP-HDL:HS interactions we discovered that HS caused significant remodeling of AP-HDL. The physical nature of this change in structure and its potential importance for cholesterol efflux from cholesterol-loaded macrophages was therefore investigated. In the presence of heparin, or HS, AP-HDL solutions at pH 5.2 became turbid within minutes. Analysis by centrifugation and gel electrophoresis indicated that AP-HDL was remodeled generating novel lipid poor particles composed only of apolipoprotein AI, which we designate β2. This remodeling is dependent on pH, glycosaminoglycan type, is promoted by Ca2+ and is independent of protease or lipase activity. Compared to HDL and AP-HDL, remodeled AP-HDL (S-HDL-SAA), containing β2 particles, demonstrated a 3-fold greater cholesterol efflux activity from cholesterol-loaded macrophage. Because the identified conditions causing this change in AP-HDL structure and function can exist physiologically at the surface of the macrophage, or in its endosomes, we postulate that AP-HDL contains latent functionalities that become apparent and active when it associates with macrophage cell surface/endosomal HS. In this way initial steps in the reverse cholesterol transport pathway are focused at sites of injury to mobilize cholesterol from macrophages that are actively participating in the phagocytosis of damaged membranes rich in cholesterol. The mechanism may also be of relevance to aspects of atherogenesis.
Evaluation of an anthropomorphic male pelvic phantom for image-guided radiotherapy
B Schaly, V Varchena, P Au, G Pang
Reports in Medical Imaging , 2009, DOI: http://dx.doi.org/10.2147/RMI.S6114
Abstract: luation of an anthropomorphic male pelvic phantom for image-guided radiotherapy Original Research (5703) Total Article Views Authors: B Schaly, V Varchena, P Au, G Pang Published Date July 2009 Volume 2009:2 Pages 69 - 78 DOI: http://dx.doi.org/10.2147/RMI.S6114 B Schaly1, V Varchena2, P Au3, G Pang3,4 1Grand River Regional Cancer Centre, Kitchener, ON, Canada; 2CIRS Inc., Norfolk, VA, USA; 3Odette Cancer Centre, Toronto, ON, Canada; 4Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, ON, Canada Abstract: Soft-tissue imaging in the treatment room is one of the main challenges faced today in high precision radiotherapy. The objective of this work is to evaluate a new anthropomorphic male pelvic phantom (CIRS Inc., Norfolk, VA, USA) that can be used in a radiotherapy department to assess the ability of an X-ray imaging system for imaging soft-tissue targets in the treatment room. To this end, we evaluated the tissue-equivalency of the phantom materials in terms of the linear attenuation and energy absorption coefficients. X-ray computed tomography (CT) images of the phantom were also obtained and compared with that of patients. Our results demonstrated that the male pelvic phantom is a good representation of actual prostate cancer patients and can be a valuable tool for image-guided radiotherapy.
Evaluation of an anthropomorphic male pelvic phantom for image-guided radiotherapy
B Schaly,V Varchena,P Au, G Pang
Reports in Medical Imaging , 2009,
Abstract: B Schaly1, V Varchena2, P Au3, G Pang3,41Grand River Regional Cancer Centre, Kitchener, ON, Canada; 2CIRS Inc., Norfolk, VA, USA; 3Odette Cancer Centre, Toronto, ON, Canada; 4Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, ON, Canada Abstract: Soft-tissue imaging in the treatment room is one of the main challenges faced today in high precision radiotherapy. The objective of this work is to evaluate a new anthropomorphic male pelvic phantom (CIRS Inc., Norfolk, VA, USA) that can be used in a radiotherapy department to assess the ability of an X-ray imaging system for imaging soft-tissue targets in the treatment room. To this end, we evaluated the tissue-equivalency of the phantom materials in terms of the linear attenuation and energy absorption coefficients. X-ray computed tomography (CT) images of the phantom were also obtained and compared with that of patients. Our results demonstrated that the male pelvic phantom is a good representation of actual prostate cancer patients and can be a valuable tool for image-guided radiotherapy. Keywords: image-guided radiotherapy, X-ray imaging, anthropomorphic phantomPACS numbers: 87.56.Fc, 87.59.bd, 87.85.Lf
Community Analysis of Social Network in MMOG  [PDF]
Sheng PANG, Changjia CHEN
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.32020
Abstract: Massive Multiplayer Online Games (MMOG) have attracted millions of players in recent years. In MMOG, players organize themselves voluntarily and fulfill collective tasks together. Because each player can join different activities, one player may show different social relationship with others in different activities. In the paper we proposed the incremental label propagation algorithm to search the cliques accurately and quickly. Then we analyzed community structure characteristics on multi-activities. It's shown that the existing guild organization cannot satisfy the requirements of multi-activities in MMOG, which motivates us to devise new community communication channels and platforms in future.
The wave-corpuscle properties of microscopic particlesin the nonlinear quantum-mechanical systems  [PDF]
Xiao-feng Pang
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.37083
Abstract: We debate first the properties of quantum mechanics and its difficulties and the reasons resulting in these diffuculties and its direction of development. The fundamental principles of nonlinear quantum mechanics are proposed and established based on these shortcomings of quantum mechanics and real motions and interactions of microscopic particles and backgound field in physical systems. Subsequently, the motion laws and wave-corpuscle duality of microscopic particles described by nonlinear Schr?dinger equation are studied completely in detail using these elementary principles and theories. Concretely speaking, we investigate the wave-particle duality of the solution of the nonlinear Schr?dinger equation, the mechanism and rules of particle collision and the uncertainty relation of particle’s momentum and position, and so on. We obtained that the microscopic particles obey the classical rules of collision of motion and satisfy the minimum uncertainty relation of position and momentum, etc. From these studies we see clearly that the moved rules and features of microscopic particle in nonlinear quantum mechanics is different from those in linear quantum mechanics. Therefore, nolinear quantum mechanics is a necessary result of development of quantum mechanics and represents correctly the properties of microscopic particles in nonlinear systems, which can solve difficulties and problems disputed for about a century by scientists in linear quantum mechanics field.
The Physical and Biological Properties of NanoTiO2 Material  [PDF]
Xiao Feng Pang
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27125
Abstract: The physical and biological properties of TiO2 materials including nano TiO2, micrometer-TiO2 and nano TiO2 tubes have been studied using scanning electron and infrared spectrometer, X-ray diffraction instrument as well as 3-(4,5- dimethylthiazol 2-yl)-2,5 diphenyltetrazolium bromide (MTT) colorimetric method, respectively. These materials are prepared by chemical deposition and anode oxidation methods, respectively. The sizes of nano TiO2 are 80 nm and 1000 nm, respectively, their infrared properties of absorption are different, the characteristic peaks of the former are 1271,1615, 2957 and 3422 cm-1, the latter are 1645 and 2356 cm-1. The nano TiO2 tubes can be formed by anode oxidation method, its diameters are between 50-100 nm, different nano TiO2 tubes contain different components of oxygen and titanium. In MTT experiment we discover the changes of properties of proliferation of the liver and chick embryo fibroblast cells under influences of nanoTiO2 relative to those of the controlled groups, when small nanoTiO2 suspension is added in these cultivated liquids of cell, but the influence of nano TiO2 on the proliferation of the person’s liver cell is still very small, therefore, the toxicities of nano TiO2 containing 80nm and 1000 nm to these cells are still first score.
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