http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Hanfy (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Poole -Frenkel conduction in polyvinyl chloride stabilized with dibutylin laurate-maleate
Salah Mahrous,T.A.Hanfy 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Electric conduction in PVC-stabilized with dibutylin lauratemaleate has been investigated. In the low voltage region, theconduction was found to be due to thermally generated carriers. At higher voltages, the conduction mechanism was identied asPooleFrenkel type. The charge carriers injected on the polymer surface from the electrodes was found to disappear and become thesource of thermally stimulated discharge (TSD) current.
-
Dielectric relaxation of chlorinated polyvinyl chloride (CPVC) stabilized with cyanoguanidine
Salah Mahrous,Taha A. Hanfy,Maged S. Sobhyv 한국물리학회 2007 Current Applied Physics Vol.7 No.6
Dielectric spectra of CPVC stabilized with cyanoguanidine were studied in the temperature range 300450 K and frequency range10 kHz to 1 MHz. In these conditions, only one clear dielectric relaxation band (a-type) associated with dipolar polarization wasobserved. Dielectric losses was found to directly proportional to the number of dipoles (N) which reects the orientational distributionof polymer chains in the amorphous region, at which dielectric losses concerned. Calculations of the dielectric modulusM0(T) at lowtemperature indicate that there is a role of the electrode polarization in the relaxation process. Dielectric loss data were used to calculatethe activation enthalpy by two dierent methods, the obtained value was. 450 kJ/mol.
-
Divya Rana,Fathimunisa Begam Afsar Hanfy 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.3
There has been an increase in demands where businesses are now required to respond to the threat of changing technology and the gradual increase in climatic variations, on the basis of the influential position that businesses are known to enjoy within the global community. If businesses are able to integrate people, technology, strategy and procedures while implementing initiatives that respond to climatic changes, it would result in creation of value in the long-term, which is a powerful too. However, there is a need to understand the threats that are presented by changing technology and climatic variations, which is the key focus of this research. The objective was to identify the business opportunities and challenges faced by businesses in KSA in the face of changing technology and climate change and whether there was an association between the two. The research adopted a quantitative methodology where the findings revealed that climatic variations can substantially impact businesses in terms of financial reporting, organizational reputation, legal responsibilities and supply chain and operations. It also found that business performance was also positively influenced by changing technology. The findings also revealed that changes in technology could also positive influence climatic variations. Thus, it can be concluded that changing technology and climatic variations bright forth substantial risks that could present opportunities as well as significant challenges for businesses operating in KSA.
-
The influence of MgO on the radiation protection and mechanical properties of tellurite glasses
Hanfi, M.Y.,Sayyed, M.I.,Lacomme, E.,Akkurt, I.,Mahmoud, K.A. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
Mechanical moduli, such as Young's modulus (E), Bulks modulus (B), Shear modulus (S), longitudinal modulus (L), Poisson's ratio (σ) and micro Hardness (H) were theoretically calculated for (100-x)TeO<sub>2</sub>+x MgO glasses, where x = 10, 20, 30, 40 and 45 mol%, based on the Makishima-Mackenzie model. The estimated results showed that the mechanical moduli and the microhardness of the glasses were improved with the increase of the MgO contents in the TM glasses, while Poisson's ratio decreased with the increase in MgO content. Moreover, the radiation shielding capacity was evaluated for the studied TM glasses. Thus, the linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), transmission factor (TF) and half-value thickness (𝚫<sub>0.5</sub>) were simulated for gamma photon energies between 0.344 and 1.406 MeV. The simulated results showed that glass TM10 with 10 mol % MgO possess the highest LAC and varied in the range between 0.259 and 0.711 cm<sup>-1</sup>, while TM45 glass with 45 mol % MgO possess the lowest LAC and vary in the range between 0.223 and 0.587 cm<sup>-1</sup> at gamma photon energies between 0.344 and 1.406 MeV. Furthermore, the BXCOM program was applied to calculate the effective atomic number (Z<sub>eff</sub>), equivalent atomic number (Z<sub>eq</sub>) and buildup factors (EBF and EABF) of the glasses. The effective removal cross-section for the fast neutrons (ERCSFN, ∑<sub>R</sub>) was also calculated theoretically. The received data depicts that the lowest ∑<sub>R</sub> was achieved for TM10 glasses, where ∑<sub>R</sub> = 0.0193 cm<sup>2</sup> g<sup>-1</sup>, while TM45 possesses the highest ERCSFN where ∑<sub>R</sub> = 0.0215 cm<sup>2</sup> g<sup>-1</sup>.
-
Physical characterization and radiation shielding features of B2O3-As2O3 glass ceramic
Mohamed Y. Hanfi,Ahmed K. Sakr,A.M. Ismail,Bahig M. Atia,Mohammed S. Alqahtani,K.A. Mahmoud 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
The synthetic B2O3eAs2O3 glass ceramic are prepared to investigate the physical properties and the radiation shielding capabilities with the variation of concentration of the As2O3 with 10, 20, 30, and 40%, respectively. XRD analyses are performed on the fabricated glasseceramic and depicted the improvement of crystallinity by adding As2O3. The radiation shielding properties are studied for the B2O3eAs2O3 glass ceramic. The values of linear attenuation coefficient (LAC) are varied with the variation of incident photon gamma energy (23.1e103 keV). The LAC values enhanced from 12.19 cm1e37.75 cm1 by raising the As2O3 concentration from 10 to 40 mol% at low gamma energy (23.1 keV) for BAs10 and BAs40, respectively. Among the shielding parameters, the halfevalue layer, transmission factor, and radiation protection efficiency are estimated. Furthermore, the fabricated samples of glass ceramic have low manufacturing costs and good shielding features compared to the previous work. It can be concluded the B2O3eAs2O3 glass ceramic is appropriate to apply in X-ray or low-energy gamma-ray shielding applications.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
