http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kashif Ali,A.K. Sarfraz,Imran M. Mirza,A. Bahadur,S. Iqbal,A. ul Haq 한국물리학회 2015 Current Applied Physics Vol.15 No.8
Maghemite (γ-Fe2O3) nanoparticles have been synthesized using a wet chemical route, optimizing the reaction time, PH value and size of the crystallite during synthesis. The Powder X-ray diffraction (XRD) measurements confirmed the presence of an impurity free maghemite phase in our sample with an average crystallite size of 16 nm as calculated from the DebyeeScherrer equation. In physical characterization, the room temperature hysteresis (M-H loop) and blocking temperature (as observed from the M-T plot) revealed that the particles are in the superparamagnetic phase at room temperature. Dielectric behaviour of γ-Fe2O3 with respect to the variation of frequency and temperature was also performed. At room temperatures, we observe a decaying behaviour of both dielectric constant (έ) and tangent looses (tanδ) at smaller frequencies while at higher frequencies both saturate to smaller constant values. In temperature dependent dielectric properties we notice that the dielectric constant (both real and imaginary parts) show an increasing trend with increasing temperatures but an overall slower enhancement at elevated frequencies. The former effect can be attributed to the possible delocalization of impurities at higher temperatures while the latter effect can be explained as an inability of the electric dipole moments to respond at higher frequencies.
Ready mixed concrete behavior of granulated blast furnace slag contained cement
M. Razaul Karim,A. B. M. Saiful Islam,Faisal I. Chowdhury,Sarder Kashif Ur Rehman,Md. Rabiul Islam 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.2
Due to enhanced construction requirement, ready mixed concrete are being popular day by day. The current study aimed to develop ready mixed concrete using GBFS contained cement and determine its properties of fresh and hardened states. A real scale experiment was set up in a ready mixed plant for measuring workability and compressive strength. The workability was tested after mixing (within 5 minutes), 30, 60, 90, 120 and 150 minutes of the running of bulk carrier. The ready mixed carrier employed spinning motion i.e., rotating around its axis with 20 RPM and running on road with 1km/h speed. The mixing ratio of cement: sand:gravel, water to cement ratio, super plasticizer were, 1:1.73:2.47, 0.40 and 6% of cement, respectively. The chemical composition of raw material was determined using XRF and the properties of cements were measured according to ASTM standards. The experimental results confirm that the cement with composition of 6.89% of GBFS, 4% of Gypsum and 89.11% of clinker showed the good compressive strength and workability of concrete after 150 minutes of the spinning motion in bulk carrier.
Effects of ultraviolet radiation on Culex quinquefasciatus immature stages
Munawar Kashif,Alahmed Azzam M.,Khalil Sayed M.S. 한국곤충학회 2021 Entomological Research Vol.51 No.3
Ultraviolet radiation has negative effects on different living organisms. The effects of ultraviolet radiation have been widely studied on some insects, such as stored-product pests. However, few studies have examined the effects of ultraviolet radiation on mosquitoes. In this study, we report the effect of ultraviolet radiation type C, or ultraviolet C, on the immature stages of Culex quinquefasciatus. Our results suggest that early larval instars were more susceptible to ultraviolet C than late instars, and longer ultraviolet C exposure times were more lethal to larvae regardless of age. Ultraviolet C caused 100% mortality in pupae after 11 minutes of exposure. No egg hatching was observed after 15 minutes of exposure. Mortality in immature stages occurred over time, especially during larval molting and adult emergence.
Physicochemical Changes in UV-Exposed Low-Density Polyethylene Films
Salem, M.A.,Farouk, H.,Kashif, I. The Polymer Society of Korea 2002 Macromolecular Research Vol.10 No.3
Unstabilized low-density polyethylene (LDPE) films and films formulated with hindered amine light stabilizer (HALS) were exposed to UV-radiation; and the physicochemical changes during photooxidation processes have been investigated using tensile, FTIR spectre-photometric and thermal analytical (DSC) techniques. The dependence of tensile properties (elongation- and stress-at-break), carboxyl index and heat of fusion on UV-irradiation time have been discussed. The use of HALS is found to be effective in maintaining the UV-mechanical properties of the LDPE films. The experimental results showed that there exists no correlation between mechanical properties and carbonyl index, whereas crystallinity correlates well with carbonyl index in unstabilized and stabilized films for irradiation times greater than 100 h. The rate of formation of carbonyl groups is found to be dependent on UV exposure time. Crystallinity of the film samples is strongly influenced by both exposure time and presence of HALS.
Effect of FRP composites on buckling capacity of anchored steel tanks
H. Ramadan,M.A. Al-Kashif,A. Rashed,M.A. Haroun 국제구조공학회 2010 Steel and Composite Structures, An International J Vol.10 No.4
Enhancement in the seismic buckling capacity of steel tanks caused by the addition of fiber reinforced polymers (FRP) retrofit layers attached to the outer walls of the steel tank is investigated. Threedimensional non-linear finite element modeling is utilized to perform such analysis considering non linear material properties and non-linear large deformation large strain analysis. FRP composites which possess high stiffness and high failure strength are used to reduce the steel hoop stress and consequently improve the tank capacity. A number of tanks with varying dimensions and shell thicknesses are examined using FRP composites added in symmetric layers attached to the outer surface of the steel shell. The FRP shows its effectiveness in carrying part of the hoop stresses along with the steel before steel yielding. Following steel yielding, the FRP restrains the outward bulging of the tank and continues to resist higher hoop stresses. The percentage improvement in the ultimate base moment capacity of the tank due to the addition of more FRP layers is shown to be as high as 60% for some tanks. The percentage of increase in the tank moment capacity is shown to be dependent on the ratio of the shell thickness to the tank radius (t/R). Finally a new methodology has been explained to calculate the location of Elephant foot buckling and consequently the best location of FRP application.
Synthesis and Characterization of In2O3Nanoparticles
A. Ayeshamariam,M. Kashif,S. Muthu Raja,S. Sivaranjani,C. SANJEEVIRAJA,M. Bououdina 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.2
Metal-oxide nanostructures have elicited increasing interest in both fundamental and appliedsciences. Among metal oxide nanostructures, In2O3 has the potential for use asa semiconductormaterial. This article provides details on studies carried out thus far for the synthesis and thecharacterization of In2O3 nanostructures. In this research, various techniques were investigatedfor the fabrication of diverse and fascinating spherical shaped In2O3 nanostructures. Brunauer-Emmett-Teller (BET) analyses of the In2O3 nanostructures through detailed refinements of thestructure of the In2O3 nanoparticles by using the Rietveld method, followed by microstructuralanalyses using scanning electron microscopy/ transmission electron microscopy (SEM/TEM) anda chemical composition analysis are presented and discussed. Decreasing crystallinity with animprovement in specific surface area was observed from the structural characterization. The energydispersive analysisresults showed that the as-prepared In2O3 powder sample was stoichiometric,containing almost equal proportions of indium and oxygen. The microstructural analysis (TEM andSEM) demonstrated precise control over the diameters of the nanoparticles, which is an importantadvantage of the solution combustion approach.
Evaluation of SSR and SNP Markers for Molecular Breeding in Rice
( Zennia Jean Gonzaga ),( Kashif Aslam ),( Endang M. Septiningsih ),( Bertrand C. Y. Collard ) 한국육종학회 2015 Plant Breeding and Biotechnology Vol.3 No.2
Simple sequence repeats (SSRs) have been the marker of choice for rice molecular breeding due to the high level of polymorphism, technical simplicity and low cost. Recent advances in rice genomics have led to the discovery of abundant single nucleotide polymorphism (SNPs) which have enormous potential for rice molecular breeding. To assess both marker systems for molecular breeding in rice, SSR and SNP markers were evaluated on a set of 23 genotypes representing indica germplasm for their usefulness in molecular research and breeding program. Seven hundred SSR and sequence tagged sites (STS) markers and 384 SNPs were screened for polymorphism. Highly polymorphic markers based on polymorphic information content (PIC) values were identified, which will be useful for molecular breeding. Data was used to identify an “indica genotyping set” based on high level of polymorphism, chromosome position and marker quality which will provide kits of markers for marker assisted selection (MAS). Genetic diversity analysis using SSR data was more consistent with pedigrees compared to analysis with SNP data indicating that more than 384 SNPs are required when elite indica breeding material is used. The results also indicated that there were polymorphic “blind spots” for the fixed SNP set suggesting that SSRs could still be used to complement fixed-SNP genotyping platforms for some molecular breeding applications.