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Search Results: 1 - 10 of 162994 matches for " Ge Y.T. "
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Two-phase distribution in the vertical flow line of a domestic wet central heating system
Fsadni A.-M.,Ge Y.T.
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134501030
Abstract: The theoretical and experimental aspects of bubble distribution in bubbly two-phase flow are reviewed in the context of the micro bubbles present in a domestic gas fired wet central heating system. The latter systems are mostly operated through the circulation of heated standard tap water through a closed loop circuit which often results in water supersaturated with dissolved air. This leads to micro bubble nucleation at the primary heat exchanger wall, followed by detachment along the flow. Consequently, a bubbly two-phase flow characterises the flow line of such systems. The two-phase distribution across the vertical and horizontal pipes was measured through a consideration of the volumetric void fraction, quantified through photographic techniques. The bubble distribution in the vertical pipe in down flow conditions was measured to be quasi homogenous across the pipe section with a negligible reduction in the void fraction at close proximity to the pipe wall. Such a reduction was more evident at lower bulk fluid velocities.
Analogy Between Heat and Mass Transfer for Constant-Rate Period During Non-Convective Drying: Application to Water-Based Alumina Suspension for Tape Casting
Y.T. Puyate
Journal of Applied Sciences , 2008,
Abstract: Analogy between heat and mass transfer is proposed for the constant-rate period during non-convective drying process. The analogy is applied to predict a temperature-dependent heat-transfer coefficient from a temperature-dependent mass-transfer coefficient also presented for the constant-rate period during non-convective drying of water-based alumina suspension for tape casting. Predicted values of the temperature-dependent heat and mass transfer coefficients are compared with experimental data and good agreement is obtained.
Extraction of Copper from Waste Solution Using Liquid Emulsion Membrane  [PDF]
Y.T. Mohamed, Ahmed M. H. Ibrahim
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.31016
Abstract: The extraction of copper from acidic medium using Liquid Emulsion Membrane LEM as contactors was studied. b diketone LIX 54 as an extractant ,sesqueoleate which is nonionic surfactant with HLB value 3.7 and 0.1 M H2SO4 as stripping solution were used. The influence of initial concentration of copper in the aqueous feed phase, pH of external and internal aqueous phase, stirring speed, and concentration of extractant on the extraction rate was examined. The results obtained showed that practically all the copper content was removed from the acidic feed solution. The recovery of copper attained 96–100% and concentration ratios of about 40-fold could be achieved.

金属学报(英文版) , 1998,
Abstract: 1.IntroductionSincethel950s,researchesontherapidly-solidified(RS)Alalloyshaveattractedspecialattentionl1-7].Inpreviousinvestigations"7],themetastableextension0fs0lidsolubilities0fsomerare-earths(RE)inAlwasrep0rted.Asac0ntinuati0nofthepr0ject,themetastablephasesformedinRSaluminium-richAl-Small0yswerereportedinthepresentpaper.Thealuminium-richendoftheAl-Smphasediagramissh0wninFig.18].Inequllibriumstate,thes0lidsolubility0fSminAlisnegligible,andaeutecticsystemisformedbetweenAlandAl3Sm.T…
Case 2
Jacky Y.T. Yeung,David T.W. Wong
University of Toronto Medical Journal , 2004, DOI: 10.5015/utmj.v81i2.716
Fertility Traits of Holstein Cows Raised at Sar msakl State Farm
Y.T. Tuna,E. K. Gurcan,T. Savas
Journal of Tekirdag Agricultural Faculty , 2007,
Abstract: The present research was carried out to determine some fertility traits in Holstein cows raised at Sarimsakli State Farm. Reproductive performance records within the period from 1983 to 2003 of 764 Holstein cows raised at the farm were constituted the research material. Effect of years on First Breeding Age (FBA), First Calving Age (FCA) and Calving Interval(CI) were significant(P<0,01).Effect of Season on CI was significant (P<0,05), however on FBA and FCA were not significant(P>0,05). Effects of Lactation Length (LL) and FCA on CI was not significant(P>0.05). Effect of FBA on FCA was significant(P<0,01). Overall means for FBA, FCA and CI were found as; 18,98 ± 2,73 month, 28,15 ± 2,50 month and 407,07 ± 78,59 day, respectively.
Surface modification of PBO fiber by electrostatic discharge for composites
G.M. Wu,Y.T. Shyng
Archives of Materials Science and Engineering , 2007,
Abstract: Purpose: PBO fibers provide great potential applications as reinforcement fibers for advanced composites due to the excellent thermal resistance and specific stiffness and strength. However, the interfacial adhesion between reinforcing fiber and polymer matrix in a composite system is a primary factor for the stress transfer from matrix to fiber. In this paper, the effects of surface treatment on the modification of PBO fiber and its composite materials have been investigated using electrostatic discharge under atmospheric pressure. The surface treatment process has been designed to improve fiber/matrix interfacial bonding quality while providing minimum alteration to the bulk characteristics of the reinforcement fiber.Design/methodology/approach: Both as-spun (AS) and high-modulus (HM) PBO fibers were surface treated and characterized in this study. The characterization techniques included scanning electron microscopy, MTS tensile tester, dynamic contact angle analysis system and microbond pull-out tests.Findings: The results showed that PBO fibers exhibited -10% reduction in tensile strength after the proposed treatment process. The AS fiber surface free energy could be increased from 49.90 mJ/m2 to 65.42 mJ/m2 (+31%) and the HM fiber surface free energy could be increased from 46.20 mJ/m2 to 65.36 mJ/m2 (+41%). The interfacial shear strength between PBO fiber and the epoxy matrix was improved to 41.6 MPa (+20%) for AS fiber system, and it improved to 40.1 MPa (+23%) for HM fiber system. The composite failure mode also shifted from fiber/matrix interface adhesive failure to partly cohesive failure.Research limitations/implications: The composite interfacial shear strength was improved through the increased surface free energy of PBO fiber. The more cohesive failure mode allowed more energy to be dissipated during failure.Originality/value: The proposed electrostatic discharge treatment process could improve the surface characteristics of PBO fiber and the applications in advanced composites.
Biocidal Efficacy of Dissolved Ozone, Formaldehyde and Sodium Hypochlorite Against Total Planktonic Microorganisms in Produced Water
Y.T. Puyate,A. Rim-Rukeh
Journal of Applied Sciences , 2008,
Abstract: The performance of three biocides (dissolved ozone, formaldehyde and sodium hypochlorite) in eliminating the bacteria and fungi in produced water is investigated experimentally. The analysis involves monitoring the microbial population in nine conical flasks each containing the same volume of a mixture of produced water, culture medium that sustains the growth of microorganisms and a known concentration of biocide. The concentrations of each biocide used in the study are 0.1, 0.2 and 0.5 ppm. It is shown that dissolved ozone exhibits the best biocidal characteristics and a concentration of 0.5 ppm eliminated all the microorganisms in the produced water after 150 min contact time.
Journal of Applied Technology in Environmental Sanitation , 2012,
Abstract: The effect of bioaugmentation on aerobic digestion of biodegradable organic waste using indigenous bacteria isolated from the waste is presented. The analysis involves twenty-five 500 mL bioaugmented flasks (bioreactors) and twenty-five 500 mL non-bioaugmented flasks (i.e. control bioreactors) charged with prepared liquid waste and aerated for a period of 50 days using air at a flow rate of 0.15 L.min-1 per 400 mL of the liquid waste in each flask. Every 2 days, one bioaugmented-bioreactor and one control-bioreactor are dismantled and the microbial density and chemical oxygen demand (COD) of liquid sample taken from each flask are measured, as well as the pH of the medium in each flask. During the first 20 days of the experiment, the microbial population in the bioaugmented bioreactors increases with time from an initial value of to a maximum value of and from an initial value of to a maximum value of in the control bioreactors; while the COD decreases with time from 58.35 mg.L-1 to 11.84 mg.L-1 with 80% conversion of the substrate in the bioaugmented bioreactors, and from 58.35 mg.L-1 to 16.91 mg.L-1 with 71% conversion of the substrate in the control bioreactors. After the 20th day of the experiment, the microbial population in both types of bioreactors decreases with time, while the COD increases with time until the last day of the experiment. The pH in the bioaugmented and non-bioaugmented bioreactors are close and vary from 4.59 to 5.63, and the temperature in two types of bioreactors lie within the range 27oC – 30oC.
Learning to Detect Spam: Naive-Euclidean Approach
Tony Y.T. Chan,Jie Ji,Qiangfu Zhao
International Journal of Signal Processing, Image Processing and Pattern Recognition , 2008,
Abstract: A method is proposed for learning to classify spam and nonspamemails. It combines the strategy of the Best Stepwise Feature Selection with a classifier of Euclidean nearest-neighbor. Each text email is first transformed into a vector of D-dimensional Euclidean space. Emails were divided into training and test sets in the manner of 10-fold crossvalidation. Three experiments were performed, and their elapsed CPU times and accuracies reported. The proposed spam detection learner was found to be extremely fast in recognition and with good error rates. It could be used as a baseline learning agent, in terms of CPU time and accuracy, against which other learning agents can be measured.
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