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Decompositions of graded maximal submodules
Fida Moh’D 대한수학회 2022 대한수학회논문집 Vol.37 No.1
In this paper, we present different decompositions of graded maximal submodules of a graded module. From these decompositions, we derive decompositions of the graded Jacobson radical of a graded module. Using these decompositions, we prove new theorems about graded maximal submodules, improve old theorems, and give other proofs for old theorems.
The observation of inherent spin Seebeck effect in Rh/YIG hybrid str
Fida Mohmed,Yuan-Hua Lin 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Rhodium (Rh) is a 4d metal possessing a large spin orbit coupling strength and spin-Hall conductivity with a very small magnetic susceptibility, implying an insignificant magnetic proximity effect (MPE). We report here the observation of longitudinal spin Seebeck effect (LSSE) using Rh as a normal metal. A Rh film was sputtered on nanometer thick YIG films of highly crystalline nature and extremely low magnetic damping to obtain Rh/YIG hybrid structure. A clear thermal voltage Vth (SSE voltage) was obtained when a temperature gradient was applied on the Rh/YIG hybrid. The Rh film showed a very weak anomalous Hall resistance and the magnetoresistive testing clearly ruled out the magnetization of the Rh films via MPE. The anisotropic magnetoresistance (AMR) revealed a clear spin hall magnetoresistance (SMR) signal in Rh film implying a purely intrinsic spin current generation, free from any parasitic magnetic effects. The work can open a new window in the study of pure and uncontaminated spin current, generated in ferromagnetic insulators, using Rh as spin current detector.
Fida Hussain,Heonseop Eom,Umair Ali Toor,Chang Soo Lee,Sang-Eun Oh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Toxicity assessment using microalgae adopted various endpoint measurements like mortality rate, photosynthetic activity, chlorophyll content, enzymatic activity, cell density, <SUP>14</SUP>C assimilation, and phosphate uptake. These algal toxicity tests usually require 3-4 days of exposure time and laborious work to measure these endpoints parameters. In the present study, we described a simple and rapid toxicity assessment procedure using photosynthetic oxygen evolution as an endpoint measurement to determine heavy metal-induced toxicity. Oxygen evolution in gaseous phase was measured over a 12 h exposure time. The toxicity of six selected heavy metals was assessed. Concentrations of 1.02, 1.91, 0.46, 3.2, 7.5, and 65.6 mg/L were obtained as EC50 values for mercury, silver, cyanide, copper, cadmium, and hexavalent chromium, respectively, for microalgae (Chlorella vulgaris). Our results demonstrated that hexavalent chromium is less sensitive depending on the conditions (low exposure time, pH 6, and high initial biomass). Toxicities in decreasing order of strength were cyanide > mercury > silver > copper > cadmium > hexavalent chromium. Results obtained in the current and earlier studies demonstrate that photosynthetic oxygen evolution offers an alternative endpoint measurement to assess toxicity since it allows sensitive and rapid detection of heavy metal-induced toxicity in water.
Fida Hussain,엄헌섭,Umair Ali Toor,이창수,Sang-Eun Oh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Toxicity assessment using microalgae adopted various endpoint measurements like mortality rate, photosynthetic activity, chlorophyll content, enzymatic activity, cell density, 14C assimilation, and phosphate uptake. These algal toxicity tests usually require 3–4 days of exposure time and laborious work to measure these endpoints parameters. In the present study, we described a simple and rapid toxicity assessment procedure using photosynthetic oxygen evolution as an endpoint measurement to determine heavy metal-induced toxicity. Oxygen evolution in gaseous phase was measured over a 12 h exposure time. The toxicity of six selected heavy metals was assessed. Concentrations of 1.02, 1.91, 0.46, 3.2, 7.5, and 65.6 mg/L were obtained as EC50 values for mercury, silver, cyanide, copper, cadmium, and hexavalent chromium, respectively, for microalgae (Chlorella vulgaris). Our results demonstrated that hexavalent chromium is less sensitive depending on the conditions (low exposure time, pH 6, and high initial biomass). Toxicities in decreasing order of strength were cyanide > mercury > silver > copper > cadmium > hexavalent chromium. Results obtained in the current and earlier studies demonstrate that photosynthetic oxygen evolution offers an alternative endpoint measurement to assess toxicity since it allows sensitive and rapid detection of heavy metal-induced toxicity in water.
Effect of Copper Nano Particles on High Temperature Tensile Behavior of Mg-Y2O3 Nanocomposite
S. Fida Hassan,Khin Sandar Tun,F. Patel,M. Gupta 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.3
Magnesium reinforced with 0.7 volume percentage of yttria is considered to be one of the most promising light weight structural nanocomposite materials, whose performance was further enhanced with incorporation of 0.3 volume percentage of nano copper particles. Elongation-to-fracture tensile test revealed that the nano copper particle effectively maintained strengthening effect on magnesium-yttria nanocomposite at up to 100 °C and gradually diminished with further increase in test temperature used in this study. Nano copper particle induced impressive enhancement in magnesium-yttria nanocomposite and led to their potential near net shape fabrication in to intricate shaped objects at a substantially low temperature.
Tibi, Fida,Guo, Jing,Ahmad, Rizwan,Lim, Michael,Kim, Minseok,Kim, Jeonghwan Pergamon Press 2019 Chemosphere Vol. No.
<P><B>Abstract</B></P> <P>To observe feasibility of membrane distillation (MD) as post-treatment for anaerobic fluidized bed membrane bioreactor (AFMBR), removals of organic and total nitrogen were investigated by using the commercial polyvinylidene difluoride (PVDF) membrane for direct contact membrane distillation (DCMD) at various operational conditions. Test solutions for MD experiments were permeate produced by staged AFMBR (SAF-MBR), permeate from single AFMBR and synthetic wastewater fed to both reactors. Increasing in feed temperature improved permeate flux through PVDF membrane, but it decreased total nitrogen (TN) removal efficiency. Effect of chemical oxygen demand (COD) concentrations in feed solutions for DCMD on TN removal efficiency was almost negligible. However, the COD removal efficiency was lower at lower feed concentration in DCMD operation. At constant feed temperature, TN removal efficiency was improved by increasing a recirculation flow rate on PVDF membrane across DCMD system. Both organic and inorganic fouling were observed on PVDF membrane surface and pore matrix after conducting DCMD operation. The organic fouling on PVDF membrane consisted mainly of protein and fatty acids, supporting that the permeate produced by AFMBR should have potentials to foul the membrane applied in DCMD system as post-treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> DCMD with PVDF membrane was operated to treat various permeates from AFMBRs. </LI> <LI> The COD removal was reduced when DCMD was operated with low feed COD. </LI> <LI> TN removal efficiency decreased with increase in recirculation flowrate on membrane. </LI> <LI> Both organic and inorganic fouling occurred on PVDF membrane at the end of DCMD. </LI> <LI> Organic fouling on PVDF membrane consisted of protein and fatty acid. </LI> </UL> </P>