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Search Results: 1 - 10 of 343755 matches for " S.S. Chang "
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Strong convergence theorem of a hybrid projection algorithm for a family of quasi-$\phi$-asymptotically nonexpansive mappings
J.F. Tang,S.S. Chang,M. Liu,J.A. Liu
Opuscula Mathematica , 2010,
Abstract: The main purpose of this paper is by using a new hybrid projection iterative algorithm to prove some strong convergence theorems for a family of quasi-$\phi$-asymptotically nonexpansive mappings. The results presented in the paper improve and extend the corresponding results announced by some authors.
Corrosion and Passivation Behaviours of Iron in Molten Alkali Carbonates
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2005,
Abstract: the corrosion and passivation behaviours of iron in ternary molten li2co3-na2co3-k2co3 mixture at different temperatures (475- 550 oc) were studied. the techniques of measurements were: open- circuit potential, galvanostatic anodic polarization, and cyclic voltammetry. the amounts of iron dissolved in the melt were determined by atomic absorption spectroscopy after each experiment. iron undergoes spontaneous passivation upon its immersion in the melt and the thickness of the oxide scales increases with the increase of temperature. during the passivation potential range different oxides and spinals are formed. these include a cubic solid solution of feo and a-lifeo2, a-life5o8 and a-fe2o3. at high anodic potentials the decomposition of carbonate takes place leading to passivity break down and co2 and o2 gases evolution. also, the spoliation of oxide scales in the carbonate melt occurs at the passivity breakdown. the values of corrosion parameters (rp, io, icorr, ip) were calculated. the different values of activation energy of corrosion process were calculated. the results of cyclic voltammetric investigation indicate the formation of different oxides and spinals, and the cathodic and anodic decomposition of carbonate. the corrosion tests in 0.05 m hcl solution indicate that the oxide scales formed on iron are multilayered. the outer layer is less protective than the inner one.
Hydrochloric Acid Corrosion Inhibition of Zn-Al-Cu Alloy by Methyl-Substituted Piperidines
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2008,
Abstract: the corrosion behavior of zn-al-cu alloy was investigated in hcl solution in absence and in presence of different concentrations of inhibitors. the techniques of measurements were: weight loss, linear polarization and galvanic static polarization. it was found that the corrosion rate of this alloy was higher than that of zinc or aluminum. the inhibitors used were: heterocyclic piperidine (pp), 2- methyl piperidine (2mp), 3-methyl piperidine (3mp) and 4- methyl piperidine (4mp). these inhibitors are mixed type and their inhibition efficiency, i%, increases according to the order: 2mp < 3mp < pp < 4mp. the values of activation energy of corrosion were determined in absence and in presence of inhibitors. it was found that the presence of these inhibitors increases the values of activation energy. the adsorption of these inhibitors on the surface of the alloy follows frumkin?s isotherm.
Corrosion inhibition of muntz (63% Cu, ? 37% Zn) alloy in HCl solution by some naturally occurring extracts
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2006,
Abstract: this work presents the results of corrosion inhibition of muntz alloy (63% cu, ? 37% zn) in 1.0 m hcl by water extracts of some naturally occurring plants. these are: outer brown skin of onion (a), onion bulb (b), the cloves of garlic bulb (c), orange peels (d), and henna leaves (e). the techniques of measurements for the determination of the amount of each zinc and copper dissolved from the alloy in the aggressive solution were: weight-loss, galvanostatic polarization, linear polarization and atomic absorption spectroscopy. from these measurements the values of surface coverage, q, and inhibition efficiency were calculated. it was found that the investigated extracts have high inhibition efficiency on the corrosion of muntz alloy in 1.0 m hcl. their inhibition efficiency decreases according to the order: c > d > e > b > a. these extracts behave as mixed inhibitors, i.e., they affect both the cathodic and anodic processes. the activation energy of corrosion was calculated in absence and in presence of extracts. it was found that the presence of extracts in 1.0 m hcl solutions increases the values of activation energy of corrosion in that order of their inhibition efficiency. the inhibiting effect of these extracts results from their adsorption on the electrode surface via the adsorption centers of the compounds present in the extracts. the adsorption of these extracts onto the surface of muntz follows frumkin,s isotherm. the atomic absorption spectroscopic measurements showed that the presence of these extracts greatly inhibits the preferential dissolution of zinc from the alloy and the occurrence of simultaneous dissolution of both zinc and copper.
An Evaluation of Challenges of Secretarial Education Programme In Nigerian Universities Between 20000 – 2009
S.S Amoor
Information Manager (The) , 2009,
Abstract: The Nigerian universities that offer Business Education programme (Secretarial Option) face some challenges in the area of lack of qualified secretarial lecturers and inadequate modern office technology and information systems for teaching and learning. This paper identifies the modern office technology and information systems relevant for secretarial training, evaluates the availability of the modern office technologies for teaching/learning and examines the adequacy of the qualification of secretarial lecturers in Nigerian universities. It finally draws conclusion and recommendations among others, that the universities’ Management should establish a Resource Mobilization Centre that would be responsible for sourcing funds to purchase and install the modern office technology and information systems for teaching and learning.
Air Powered Vehicles
S.S. Verma
The Open Fuels & Energy Science Journal , 2008, DOI: 10.2174/1876973X00801010054]
Abstract: Light utility vehicles are becoming very popular means of independent transportation for short distances. Cost and pollution with petrol and diesel are leading vehicle manufacturers to develop vehicles fueled by alternative energies. Engineers are directing their efforts to make use of air as an energy source to run the light utility vehicles. The use of compressed air for storing energy is a method that is not only efficient and clean, but also economical. The major problem with compressed air cars was the lack of torque produced by the "engines" and the cost of compressing the air. Recently several companies have started to develop compressed air vehicles with many advantages and still many serious bottlenecks to tackle. This paper briefly summarize the principle of technology, latest developments, advantages and problems in using compressed air as a source of energy to run vehicles.
Methicillin resistance in Staphylococcus aureus: a review of the molecular epidemiology, clinical significance and laboratory detection methods
S.S Taiwo
West African Journal of Medicine , 2009,
Abstract: BACKGROUND: Despite the volume of knowledge, enhanced surveillance and infection control measures adopted by health care institutions to address the endemicity and frequent disease outbreaks by methicillin-resistant Staphylococcus aureus (MRSA) in hospitals and health care facilities worldwide, infections due to this organism are still responsible for about 50% of hospital acquired S. aureus infections, with increasing morbidity and mortality. OBJECTIVE: To provide regional clinicians with current information on the molecular epidemiology, laboratory detection and clinical aspects of MRSA. METHODS: A review of published literatures on MRSA in Medical Libraries and bibliographic citations on PubMed, Medline and Africa Index Medicus on molecular epidemiology and clinical diseases caused by MRSA and the assessment of the recent laboratory diagnostic approaches. RESULTS: This review showed that there has been intercontinental spread of some highly pathogenic clones of MRSA threatening to create public health hazard of unprecedented proportion, with the greatest challenge to mankind, being the development of resistance to multiple antibiotics, which in recent times had included resistance to vancomycin and other glycopeptides, the only antibiotic group effective against it. Added to this burden is the emergence of more virulent strains of community-associated MRSA (CAMRSA) which at the turn of the century, has been increasingly reported to cause infections and outbreaks in populations without predisposing risk factors, with attendant high morbidity and mortality. CONCLUSION: There is need for active MRSA surveillance by healthcare institutions in Africa to identify potential outbreaks, and vigilance in the enforcement of infection control measures such as rational prescription of antibiotics, handwashing, disinfection and sterilization that can limit the emergence and spread of more resistant clones of MRSA. WAJM 2009; 28(5): 281–290.
THE ROLE OF TEXTILE INDUSTRY IN THE ECONOMIC DEVELOPMETN OF SHOLAPUR
JAWALE S.S.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Sholapur is situated on 170 40' north latitude and 750 46' East longitude. It is about 283 miles from the sea-coast and situated at a height of 1800 feet above the mean seal levels.1 Sholapur City is the head –quarters of the district bearing the same name and is railway station on the broad gauge line of the South Central Railway ,165 miles to the South –East of Pune and 283 miles to the South-East of Bombay. Sholapur being a historical place and place with Religious Industrial and Commercial importance, there are a number of objects of interest in the city. The foremost amongst the object of interest in the city is its growth of Textile Industry.2 Economic Development of Sholapur can be traced by t
Survey of Listeria monocytogenes and Other Listeria sp. Contamination in Different Common Ready-to-Eat Food Products in Jordan
S.S. Awaisheh
Pakistan Journal of Biological Sciences , 2009,
Abstract: Incidence and contamination levels of different Listeria monocytogenes serovars and different Listeria sp. in 360 samples of common ready-to-eat food products in Jordan were investigated. The presence of L. monocytogenes was determined using EN ISO protocol and confirmed using PCR technique. Five Listeria sp.: L. monocytogenes, L. innocua, L. ivanovvi, L. welshimeri and L. seeligeri were isolated. L. monocytogenes was isolated from 19 samples (5.3%), from 6 RTE dairy samples; 6 RTE vegetables samples and 4 traditional dishes samples and 3 miscellaneous samples. L. innocua and L. ivanovvi were the most and least frequently isolated species, 24 and 3 samples, respectively. L. welshimeri was isolated from 8 samples and L. seeligeri from 7 samples. The contamination levels of L. monocytogenes were found to be ≤100 CFU g-1 in 84.2% (16 samples) of the positive samples. Only 15.8% (3 samples; 1 vegetable, 1 traditional dish and 1 miscellaneous samples) of the positive samples were found with counts >100 CFU g-1. L. monocytogenes strains isolated fell into 2 serotype, 1 and 4 and to 5 different serovars, 1/2a, 1/2b, 1/2c, 4a, 4c.
Humidity conditions of the external thermal insulation composite systems with the ventilated air gap
S.S. Soloshchenko
Magazine of Civil Engineering , 2010,
Abstract: Currently, external insulation facade systems and particularly rainscreen and external thermal insulation composite systems (ETICS) become very popular. Each of mentioned systems has a number of advantages and certain disadvantages due to which the problem of durability and efficiency of external insulation facade systems remains actual. One of the methods to solve this problem is to provide traditional external thermal insulation composite systems with the ventilated air gap presented by innovative material – ventilated fa ade mat Stuccodrain. Influence of air permeability of provided ventilated air gap in ETICS on moisture conditions of the wall structure has been considered in this work. The method of calculation of such an influence is based upon the comparative evaluation of non-stationary humidity conditions of ETICS and humidity conditions of ETICS with the ventilated air gap.The results of the comparative evaluation show that humidity of render layer in case of ETICS provided with ventilated air gap reduces significantly in comparison with traditional ETICS. Humidity reduction in external render layer of structure raises the durability and keeps the efficiency of the structure during the exploitation period. At the sections of the ventilated air gap where the humidity level of render layer less then maximum sorption humidity freeze and defrosting of the layer during exploitation in most case will not lead to destructions.
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