A theoretical investigation of the modulational stability of the ion temperature gradient (ITG) mode in electron–ion plasma is presented. To examine linear features of dynamic species in plasma, we used reduction perturbation to solve Braginskii’s transportation equations and get phase and group velocities. The results reveal that ion species velocities are affected by plasma factors such as ion temperature, density, and ion temperature gradient coefficient, among others. We also find a nonlinear Schrodinger equation. This equation shows that the plasma dynamics depends on the coefficients of nonlinearity and dissipation of the nonlinear Schrodinger equation. These coefficients are strongly related to the plasma variables. The present investigation may be helpful in space and laboratory plasma, e.g., fusion confinement devices.
{"title":"Modulational Stability Analysis of Ion Temperature Gradient Mode in Electron-ion Plasma","authors":"K. Aziz, U. Zakir, Q. Haque, I. Haq, F. Khan","doi":"10.48129/kjs.18845","DOIUrl":"https://doi.org/10.48129/kjs.18845","url":null,"abstract":"A theoretical investigation of the modulational stability of the ion temperature gradient (ITG) mode in electron–ion plasma is presented. To examine linear features of dynamic species in plasma, we used reduction perturbation to solve Braginskii’s transportation equations and get phase and group velocities. The results reveal that ion species velocities are affected by plasma factors such as ion temperature, density, and ion temperature gradient coefficient, among others. We also find a nonlinear Schrodinger equation. This equation shows that the plasma dynamics depends on the coefficients of nonlinearity and dissipation of the nonlinear Schrodinger equation. These coefficients are strongly related to the plasma variables. The present investigation may be helpful in space and laboratory plasma, e.g., fusion confinement devices.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76451637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Bibi, Khalid Raza, W. Rehman, Siddiqa Begum, S. Muhammad, S. W. Shah, L. Shah, S. Bibi, Wajhia Khan, Magda H. Abdellatif
Here, we report the facile route for the synthesis of graphene oxide–functionalized manganese dioxide (GO–MnO2@Tau (GMT) and GO-MnO2@CA) (GMC) nanohybrids and their use as adsorbents for removal of selected dyes from industrial effluents. These nanohybrids were also tested for antibacterial activity in wastewater. Manganese dioxide nanoparticles were synthesized by redox reaction between potassium permanganate (KMnO4) and manganese acetate (Mn(CH3COO)2.4H2O) and functionalized with taurine (H3N+CH2CH2SO3−) and caproic acid (CH3(CH2)8COOH) to produce MnO2@Tau and MnO2@CA. These functionalized-MnO2 were then exploited as reinforcement in graphene oxide (GO) to fabricate nanohybrids. The nanohybrids were characterized for their morphology, structure, crystallinity and thermal behavior by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, UV-Visible spectroscopy and thermogravimetric analysis (TGA). The results were reproducible with negligible variation in physical properties among different batches. They were investigated for adsorptive removal of methylene blue and malachite green and effect of temperature and quantity of adsorbent were studied. The adsorption of both dyes followed pseudo second order kinetics. The addition of MnO2@tau and MnO2@CA as nanofillers within GO has led to decrease in its crystallinity. This may be attributed to the dispersion of MnO2@tau and MnO2@CA within layers of GO which causes breakage of regular stacks of GO. The antibacterial activity of GO-MnO2@Tau and GO-MnO2@CA nanohybrids were tested against two bacterial strains (Gram-negative E. coli, and the Gram-positive S. aureus) and the results revealed efficient inhibition of these pathogens.
{"title":"Synthesis of ternary nanocomposites of GO–MnO2@Tau and GO-MnO2@CA for efficient removal of dyes","authors":"I. Bibi, Khalid Raza, W. Rehman, Siddiqa Begum, S. Muhammad, S. W. Shah, L. Shah, S. Bibi, Wajhia Khan, Magda H. Abdellatif","doi":"10.48129/kjs.19959","DOIUrl":"https://doi.org/10.48129/kjs.19959","url":null,"abstract":"Here, we report the facile route for the synthesis of graphene oxide–functionalized manganese dioxide (GO–MnO2@Tau (GMT) and GO-MnO2@CA) (GMC) nanohybrids and their use as adsorbents for removal of selected dyes from industrial effluents. These nanohybrids were also tested for antibacterial activity in wastewater. Manganese dioxide nanoparticles were synthesized by redox reaction between potassium permanganate (KMnO4) and manganese acetate (Mn(CH3COO)2.4H2O) and functionalized with taurine (H3N+CH2CH2SO3−) and caproic acid (CH3(CH2)8COOH) to produce MnO2@Tau and MnO2@CA. These functionalized-MnO2 were then exploited as reinforcement in graphene oxide (GO) to fabricate nanohybrids. The nanohybrids were characterized for their morphology, structure, crystallinity and thermal behavior by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, UV-Visible spectroscopy and thermogravimetric analysis (TGA). The results were reproducible with negligible variation in physical properties among different batches. They were investigated for adsorptive removal of methylene blue and malachite green and effect of temperature and quantity of adsorbent were studied. The adsorption of both dyes followed pseudo second order kinetics. The addition of MnO2@tau and MnO2@CA as nanofillers within GO has led to decrease in its crystallinity. This may be attributed to the dispersion of MnO2@tau and MnO2@CA within layers of GO which causes breakage of regular stacks of GO. The antibacterial activity of GO-MnO2@Tau and GO-MnO2@CA nanohybrids were tested against two bacterial strains (Gram-negative E. coli, and the Gram-positive S. aureus) and the results revealed efficient inhibition of these pathogens.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75823495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ashraf M. Alattar, Mohammed J. Alwazzan, Khalida A Thejeel
In this study, we were able to create highly dispersed silica nanoparticles with diameters of less than one nm by changing the sol-gel technique. During the poly-condensation process, a strong magnetic field was applied to the silica sol to control particle size. The size of silica nanoparticles has a substantial impact on preparation elements such pH, magnetic field intensity, and exposure time. These parameters can be changed in a systematic manner to reduce or increase particle size. A dynamic light scattering test was also used to investigate the effect of a magnetic field on the particle size and dispersion of silica dust. Despite the fact that silica is naturally diamagnetic, the magnetic field has a considerable impact on their size growth. Magnetic fields altered the typical influence on silicon structure, resulting in crystal formation in the silicon sample under consideration. Many applications require small particle sizes and/or a narrow particle size dispersion. The building blocks of nanotechnology are usually made of low-dimension particles. The experts concluded that additional research into such strange phenomena will be required in the future.
{"title":"Controlling the nanoparticle size of silica in an acidic environment by using a strong magnetic field and a modified sol-gel techniques","authors":"Ashraf M. Alattar, Mohammed J. Alwazzan, Khalida A Thejeel","doi":"10.48129/kjs.20819","DOIUrl":"https://doi.org/10.48129/kjs.20819","url":null,"abstract":"In this study, we were able to create highly dispersed silica nanoparticles with diameters of less than one nm by changing the sol-gel technique. During the poly-condensation process, a strong magnetic field was applied to the silica sol to control particle size. The size of silica nanoparticles has a substantial impact on preparation elements such pH, magnetic field intensity, and exposure time. These parameters can be changed in a systematic manner to reduce or increase particle size. A dynamic light scattering test was also used to investigate the effect of a magnetic field on the particle size and dispersion of silica dust. Despite the fact that silica is naturally diamagnetic, the magnetic field has a considerable impact on their size growth. Magnetic fields altered the typical influence on silicon structure, resulting in crystal formation in the silicon sample under consideration. Many applications require small particle sizes and/or a narrow particle size dispersion. The building blocks of nanotechnology are usually made of low-dimension particles. The experts concluded that additional research into such strange phenomena will be required in the future.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89436498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Tahir, M. Ashraf, Atteeq Razzak, S. M. Raza, Z. Uddin
The notion of this research was to find the climatological parameter of a location (whose data are notavailable) with the help of climatological parameters of its neighboring locations. In this study, we supposed Hyderabad as such a location; its neighboring cities Karachi, Badin, and Nawabshah form a triangle, and Hyderabad lies within the perimeter of the triangle. The task was to find the temperature distribution of Hyderabad using the temperatures of its neighboring cities. Two different methods, Artificial Neural Networks and multiple regression analysis, have been used to find the temperature of Hyderabad by using the temperature distribution of neighboring cities, Karachi,Nawabshah, and Badin. ANN with one hidden layer of 10 neurons is used, which connect three known temperature of Karachi, Nawabshah, and Badin to the output temperature of Hyderabad. Amultiple regression analysis with three independent variables, i.e., the temperatures of Karachi,Nawabshah, and Badin, are used to find a linear equation of multiple variables for the temperature of Hyderabad.Both ANN and multiple regression analysis produce an excellent result, and it is suggested toimplement the technique where direct measurement of the climatological data system is not present.
{"title":"Temperature data of Hyderabad from the temperature of three neighboring cities using the ANN and the multiple regression methods","authors":"A. Tahir, M. Ashraf, Atteeq Razzak, S. M. Raza, Z. Uddin","doi":"10.48129/kjs.20585","DOIUrl":"https://doi.org/10.48129/kjs.20585","url":null,"abstract":"The notion of this research was to find the climatological parameter of a location (whose data are notavailable) with the help of climatological parameters of its neighboring locations. In this study, we supposed Hyderabad as such a location; its neighboring cities Karachi, Badin, and Nawabshah form a triangle, and Hyderabad lies within the perimeter of the triangle. The task was to find the temperature distribution of Hyderabad using the temperatures of its neighboring cities. Two different methods, Artificial Neural Networks and multiple regression analysis, have been used to find the temperature of Hyderabad by using the temperature distribution of neighboring cities, Karachi,Nawabshah, and Badin. ANN with one hidden layer of 10 neurons is used, which connect three known temperature of Karachi, Nawabshah, and Badin to the output temperature of Hyderabad. Amultiple regression analysis with three independent variables, i.e., the temperatures of Karachi,Nawabshah, and Badin, are used to find a linear equation of multiple variables for the temperature of Hyderabad.Both ANN and multiple regression analysis produce an excellent result, and it is suggested toimplement the technique where direct measurement of the climatological data system is not present.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"9 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91203187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Ali, Dhanachandra Kuraijam, S. Karnik, Laila A. Jaragh-Alhadad
Manganese complex of (N'1E,N'3E)-N'1,N'3-bis(2-hydroxybenzylidene)isophthalo-hydrazide [H4L] was designed, spectroscopically analyzed, and confirmed via GC-MS, FTIR, CHNS, UV-VIS, magnetic susceptibility measurements, and molar electric conductivity. The data confirmed the formation of ligand H4L and [Mn2(H2L)Cl]Cl.2H2O complex. Ligand H4L acts as a bi-negative hexadentate and tetra-negative hexadentate coordinating through two amide carbonyl, two azomethine, and two deprotonated OH groups. The magnetic and spectral data proposed a square-planar and a tetrahedral structure. The TGA data confirmed the final metal oxide form for the Mn ligand complex. Additionally, an in-vitro assessment of the ligand H4L confirmed its ability to control cancer cell proliferation in both breast (MCF7) and lung (A549) cancer cell lines while the Mn ligand complex possessed an anticancer effect in both cancer cells at the nano-molar level. Further, the in silico data showed four hydrogen bond interactions of the ligand with G-quadruplex DNA. This strengthens our hypothesis that the hydrazone complex acts as an anticancer agent by targeting the G-quadruplex DNA.
{"title":"Hydrazone bimetallic complex: synthesis, characterization, in silico and biological evaluation targeting breast and lung cancer cells’ G-quadruplex DNA","authors":"M. Ali, Dhanachandra Kuraijam, S. Karnik, Laila A. Jaragh-Alhadad","doi":"10.48129/kjs.21599","DOIUrl":"https://doi.org/10.48129/kjs.21599","url":null,"abstract":"Manganese complex of (N'1E,N'3E)-N'1,N'3-bis(2-hydroxybenzylidene)isophthalo-hydrazide [H4L] was designed, spectroscopically analyzed, and confirmed via GC-MS, FTIR, CHNS, UV-VIS, magnetic susceptibility measurements, and molar electric conductivity. The data confirmed the formation of ligand H4L and [Mn2(H2L)Cl]Cl.2H2O complex. Ligand H4L acts as a bi-negative hexadentate and tetra-negative hexadentate coordinating through two amide carbonyl, two azomethine, and two deprotonated OH groups. The magnetic and spectral data proposed a square-planar and a tetrahedral structure. The TGA data confirmed the final metal oxide form for the Mn ligand complex. Additionally, an in-vitro assessment of the ligand H4L confirmed its ability to control cancer cell proliferation in both breast (MCF7) and lung (A549) cancer cell lines while the Mn ligand complex possessed an anticancer effect in both cancer cells at the nano-molar level. Further, the in silico data showed four hydrogen bond interactions of the ligand with G-quadruplex DNA. This strengthens our hypothesis that the hydrazone complex acts as an anticancer agent by targeting the G-quadruplex DNA.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83777709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper shows the thermodynamic properties of alloys Fe-Cr-C, Fe-Ni-C system using modeling and simulation approach. The thermo-calc software with databases is utilized for calculations and results. The calculation shows alloying at (1900K-2000K) temperature range. The atmospheric pressure is kept constant 106 Pascal. The active phase at 1900K is liquid phase with 1.00 mass % for C compositions. The total Gibbs energy is found decreasing in the Fe-Ni-C system, which shows the stability of the system. The solubility of Cr is found less than the solubility of Ni in the Fe-C system as investigated during activities simulations. The enthalpy and entropy of the system is found of the near linear relation with temperature raise and coupling properties of the alloying.BCC of entropy is more responsive than BCC of enthalpy during alloying. The Fe-Ni-C shows negative deviations from Raoults law and corresponding positive deviations from vegard’s and Henry law. The withstanding phase is graphite with highest thermal expansion coefficient. The highest T-zero fluctuations is noted in the Fe-Cr-C system. The alloy shows the less solubility of the carbon at low temperature, while results the great alloying at higher temperature in the Fe-Ni-C system better industrial aspects.
{"title":"Modeling of thermodynamic properties of Fe-Ni-C, Fe-Cr-C alloys using computational approach","authors":"W. U. Shah, D. Khan, S. Jan, Haiqing Yin","doi":"10.48129/kjs.20257","DOIUrl":"https://doi.org/10.48129/kjs.20257","url":null,"abstract":"The paper shows the thermodynamic properties of alloys Fe-Cr-C, Fe-Ni-C system using modeling and simulation approach. The thermo-calc software with databases is utilized for calculations and results. The calculation shows alloying at (1900K-2000K) temperature range. The atmospheric pressure is kept constant 106 Pascal. The active phase at 1900K is liquid phase with 1.00 mass % for C compositions. The total Gibbs energy is found decreasing in the Fe-Ni-C system, which shows the stability of the system. The solubility of Cr is found less than the solubility of Ni in the Fe-C system as investigated during activities simulations. The enthalpy and entropy of the system is found of the near linear relation with temperature raise and coupling properties of the alloying.BCC of entropy is more responsive than BCC of enthalpy during alloying. The Fe-Ni-C shows negative deviations from Raoults law and corresponding positive deviations from vegard’s and Henry law. The withstanding phase is graphite with highest thermal expansion coefficient. The highest T-zero fluctuations is noted in the Fe-Cr-C system. The alloy shows the less solubility of the carbon at low temperature, while results the great alloying at higher temperature in the Fe-Ni-C system better industrial aspects.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83845206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tharangika K. Bowange, Md Fuad Hossain, Kavinda A. Wijesekera, K. Kumara, R. Ratnayake
Ever growing population and environmental degradation lead to a rapid deterioration of global health, causing malnutrition and Ultra Violet radiation-induced skin damages to be more prevalent. It is critical to address these health issues quickly and sustainably. Compared to natural botanicals, cyanobacteria could be more promising due to their superior photosynthetic capabilities, rapid growth, low space and simple nutrients requirements, low capital investment, and zero environmental pollution. Therefore, this study explores the value added potential of freshwater cyanobacteria in addressing the above health issues sustainably. Eight cyanobacteria strains, isolated from freshwater reservoirs in the dry zone of Sri Lanka were analyzed for total carbohydrate, protein, macro and micro minerals using Dubois’ method, Lowry method, and Inductively Coupled Plasma Optical Emission Spectrometry. Mansur equation was applied to determine the Sun Protection Factor (SPF). Total carbohydrate and protein contents were in the range of 7.08 ± 0.32% - 53.08 ± 0.32% and 15.27 ± 0.90% - 49.77 ± 9.62%, respectively. Oscillatoriales had the highest total carbohydrate content (53.08 ± 0.32%), higher than the carbohydrate content of other previously reported Oscillatoria species. Calcium and iron were the most abundant macro and micro minerals, respectively. Oscillatoriales recorded the highest SPF (1.57 ± 0.002), whereas all the other strains had considerably greater or similar SPFs compared to other previously reported herbal extracts. Cyanobacteria with rich nutrition profiles and high SPF values may thus represent interesting alternatives for offering sustainable and ecofriendly solutions to significant health challenges associated with population growth.
{"title":"Investigation of the value-added potential of some selected freshwater cyanobacteria","authors":"Tharangika K. Bowange, Md Fuad Hossain, Kavinda A. Wijesekera, K. Kumara, R. Ratnayake","doi":"10.48129/kjs.15295","DOIUrl":"https://doi.org/10.48129/kjs.15295","url":null,"abstract":"Ever growing population and environmental degradation lead to a rapid deterioration of global health, causing malnutrition and Ultra Violet radiation-induced skin damages to be more prevalent. It is critical to address these health issues quickly and sustainably. Compared to natural botanicals, cyanobacteria could be more promising due to their superior photosynthetic capabilities, rapid growth, low space and simple nutrients requirements, low capital investment, and zero environmental pollution. Therefore, this study explores the value added potential of freshwater cyanobacteria in addressing the above health issues sustainably. Eight cyanobacteria strains, isolated from freshwater reservoirs in the dry zone of Sri Lanka were analyzed for total carbohydrate, protein, macro and micro minerals using Dubois’ method, Lowry method, and Inductively Coupled Plasma Optical Emission Spectrometry. Mansur equation was applied to determine the Sun Protection Factor (SPF). Total carbohydrate and protein contents were in the range of 7.08 ± 0.32% - 53.08 ± 0.32% and 15.27 ± 0.90% - 49.77 ± 9.62%, respectively. Oscillatoriales had the highest total carbohydrate content (53.08 ± 0.32%), higher than the carbohydrate content of other previously reported Oscillatoria species. Calcium and iron were the most abundant macro and micro minerals, respectively. Oscillatoriales recorded the highest SPF (1.57 ± 0.002), whereas all the other strains had considerably greater or similar SPFs compared to other previously reported herbal extracts. Cyanobacteria with rich nutrition profiles and high SPF values may thus represent interesting alternatives for offering sustainable and ecofriendly solutions to significant health challenges associated with population growth.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86312424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Nishat, Malik Wasim Abbas, F. Awan, R. A. Soomro
Owing to unique physical and optical properties, fluorescent carbon dots (C-dots) are used in various biomedical applications. In this study, C-dots have been integrated as sensing agent on paper surface for colorimetric determination of clinically important analytes. Polyacrylamide-based C-dots coated C-dips showed visible color change from white to brown for iron (Fe2+, Fe3+) sample. Moreover, iron and copper (Cu2+) samples showed significant quenching of C-dots under UV. Images captured with/without UV were analyzed to study the relationship between different iron and copper concentrations and colorimetric intensity values. Color intensity and fluorescence showed a linear relationship with concentrations of iron and copper (Range: 1×10-4 to 1×10-2 M, Linearity: R2 = 0.94). LOD from the paper sensor showed a sensitivity of 3.89×10-5 μM, 4.65×10-5 μM and 6.7×10-5 μM for Fe3+, Fe2+ and Cu2+ respectively, reflecting its reliability as low-cost sensing solution to analyze clinically relevant analytes as reported in current study.
{"title":"Carbon nanodots-based C-dips for rapid colorimetric detection of clinically important metal ions","authors":"S. Nishat, Malik Wasim Abbas, F. Awan, R. A. Soomro","doi":"10.48129/kjs.13997","DOIUrl":"https://doi.org/10.48129/kjs.13997","url":null,"abstract":"Owing to unique physical and optical properties, fluorescent carbon dots (C-dots) are used in various biomedical applications. In this study, C-dots have been integrated as sensing agent on paper surface for colorimetric determination of clinically important analytes. Polyacrylamide-based C-dots coated C-dips showed visible color change from white to brown for iron (Fe2+, Fe3+) sample. Moreover, iron and copper (Cu2+) samples showed significant quenching of C-dots under UV. Images captured with/without UV were analyzed to study the relationship between different iron and copper concentrations and colorimetric intensity values. Color intensity and fluorescence showed a linear relationship with concentrations of iron and copper (Range: 1×10-4 to 1×10-2 M, Linearity: R2 = 0.94). LOD from the paper sensor showed a sensitivity of 3.89×10-5 μM, 4.65×10-5 μM and 6.7×10-5 μM for Fe3+, Fe2+ and Cu2+ respectively, reflecting its reliability as low-cost sensing solution to analyze clinically relevant analytes as reported in current study.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84314999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present study, we investigate the effectiveness of existing methods for evaluating the heat capacity of uranium dioxide ( 2UO ) by considering the fractal structure of materials. Two wellknown theoretical methods were investigated in this work which have the advantages of giving accurate and efficient calculation results for the heat capacities of uranium dioxide for a wide range of temperatures. To verify the effectiveness of these theoretical methods, we compare the calculation results with existing experimental data from the literature. Based on the concept of fractality, the results obtained in this work are useful for determining the best theoretical approaches, i.e., those that are more convenient and meaningful for the evaluation of the heat capacities of uranium dioxide. The approaches and results presented in this study can provide useful knowledge for accurate investigations of the physical properties of other nuclear fuels.
{"title":"The comparative study of the specific heat capacity of uranium dioxide according to the fractal structure","authors":"T. Mehmetoğlu","doi":"10.48129/kjs.21177","DOIUrl":"https://doi.org/10.48129/kjs.21177","url":null,"abstract":"In the present study, we investigate the effectiveness of existing methods for evaluating the heat capacity of uranium dioxide ( 2UO ) by considering the fractal structure of materials. Two wellknown theoretical methods were investigated in this work which have the advantages of giving accurate and efficient calculation results for the heat capacities of uranium dioxide for a wide range of temperatures. To verify the effectiveness of these theoretical methods, we compare the calculation results with existing experimental data from the literature. Based on the concept of fractality, the results obtained in this work are useful for determining the best theoretical approaches, i.e., those that are more convenient and meaningful for the evaluation of the heat capacities of uranium dioxide. The approaches and results presented in this study can provide useful knowledge for accurate investigations of the physical properties of other nuclear fuels.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85795528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present article, we explore the new exact solutions of wormhole geometry by imposing the nonconstant Ricci scalar under inhomogeneous spacetime in the modified f(R; T) theory of gravity. We take two dissimilar models of f1(R) that are f1(R) = R (1 e R ) known as exponential gravity model and f1(R) = R tanh(R ) known as Tsujikawa model, where; are model parameters. We explore the feasible solutions for these models. Moreover, we discuss analytically and graphically the different properties of these models of wormholes by giving suitable values to the model parameters. We consider a specific shape functions i.e., b(r) = r0 log( r r0 + 1) and discuss the energy conditions for the above mentioned two models. Conclusively, we find that obtained wormhole solutions are physically acceptable with the considered exponential and Tsujikawa gravity models with or without the presence of exotic matter.
{"title":"Wormhole solutions and energy conditions in f(R; T) gravity with exponential models","authors":"G. Mustafa, M. Shamir, Anum Fazal","doi":"10.48129/kjs.12005","DOIUrl":"https://doi.org/10.48129/kjs.12005","url":null,"abstract":"In the present article, we explore the new exact solutions of wormhole geometry by imposing the nonconstant Ricci scalar under inhomogeneous spacetime in the modified f(R; T) theory of gravity. We take two dissimilar models of f1(R) that are f1(R) = R (1 e R ) known as exponential gravity model and f1(R) = R tanh(R ) known as Tsujikawa model, where; are model parameters. We explore the feasible solutions for these models. Moreover, we discuss analytically and graphically the different properties of these models of wormholes by giving suitable values to the model parameters. We consider a specific shape functions i.e., b(r) = r0 log( r r0 + 1) and discuss the energy conditions for the above mentioned two models. Conclusively, we find that obtained wormhole solutions are physically acceptable with the considered exponential and Tsujikawa gravity models with or without the presence of exotic matter.","PeriodicalId":49933,"journal":{"name":"Kuwait Journal of Science & Engineering","volume":"163 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86343709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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