N. Giannopoulos, G. Ioannidis, G. Vokas, C. Psomopoulos
Scientific studies have been published over the last decade in which several researchers have proposed numerous techniques for limiting the current unbalance between a number of discrete parallel Silicon Carbide (SiC) MOSFETs. This unbalance is unavoidable and should be limited in order to exploit all the advantages offered by SiC semiconductors over Si counterparts as far as possible. This effort aims to optimize the operation of converters in medium and high-power density applications. Such applications are converters for photovoltaic power generation, electric vehicles, high-power density motor drives, smart grids, solid-state transformers for distribution network, HVDC transmission, railway systems, etc. SiC MOSFET, as one of the Wide Band Gap (WBG) devices, has become increasingly popular in the aforementioned applications because of its superior characteristics and the increasing demands for higher efficiency and reliability, higher limits of power density, lower weight/volume packages and higher thermal operating limits of electric power conversion. However, these applications are characterized by high currents and therefore the parallelism of SiC MOSFETs is necessary either by paralleling a number of discrete SiC MOSFETs or by designing and building multi-chip SiC MOSFET power module. Consequently, these techniques increase the reliability and performance of SiC MOSFETs’ parallel operation by reducing conduction and switching losses, power losses and simultaneously achieving energy savings while reducing the environmental impact. In this paper techniques for suppressing the current imbalance which occurs between parallel-connected discrete SiC MOSFET are reviewed and presented. These techniques are analyzed, discussed and compared. The aim of this bibliographic review and comparative study is to highlight the techniques that combine low complexity and high efficiency in their implementation.Scientific studies have been published over the last decade in which several researchers have proposed numerous techniques for limiting the current unbalance between a number of discrete parallel Silicon Carbide (SiC) MOSFETs. This unbalance is unavoidable and should be limited in order to exploit all the advantages offered by SiC semiconductors over Si counterparts as far as possible. This effort aims to optimize the operation of converters in medium and high-power density applications. Such applications are converters for photovoltaic power generation, electric vehicles, high-power density motor drives, smart grids, solid-state transformers for distribution network, HVDC transmission, railway systems, etc. SiC MOSFET, as one of the Wide Band Gap (WBG) devices, has become increasingly popular in the aforementioned applications because of its superior characteristics and the increasing demands for higher efficiency and reliability, higher limits of power density, lower weight/volume packages and higher th...
{"title":"Current balancing techniques of parallel-connected silicon carbide MOSFETs: A review","authors":"N. Giannopoulos, G. Ioannidis, G. Vokas, C. Psomopoulos","doi":"10.1063/1.5138545","DOIUrl":"https://doi.org/10.1063/1.5138545","url":null,"abstract":"Scientific studies have been published over the last decade in which several researchers have proposed numerous techniques for limiting the current unbalance between a number of discrete parallel Silicon Carbide (SiC) MOSFETs. This unbalance is unavoidable and should be limited in order to exploit all the advantages offered by SiC semiconductors over Si counterparts as far as possible. This effort aims to optimize the operation of converters in medium and high-power density applications. Such applications are converters for photovoltaic power generation, electric vehicles, high-power density motor drives, smart grids, solid-state transformers for distribution network, HVDC transmission, railway systems, etc. SiC MOSFET, as one of the Wide Band Gap (WBG) devices, has become increasingly popular in the aforementioned applications because of its superior characteristics and the increasing demands for higher efficiency and reliability, higher limits of power density, lower weight/volume packages and higher thermal operating limits of electric power conversion. However, these applications are characterized by high currents and therefore the parallelism of SiC MOSFETs is necessary either by paralleling a number of discrete SiC MOSFETs or by designing and building multi-chip SiC MOSFET power module. Consequently, these techniques increase the reliability and performance of SiC MOSFETs’ parallel operation by reducing conduction and switching losses, power losses and simultaneously achieving energy savings while reducing the environmental impact. In this paper techniques for suppressing the current imbalance which occurs between parallel-connected discrete SiC MOSFET are reviewed and presented. These techniques are analyzed, discussed and compared. The aim of this bibliographic review and comparative study is to highlight the techniques that combine low complexity and high efficiency in their implementation.Scientific studies have been published over the last decade in which several researchers have proposed numerous techniques for limiting the current unbalance between a number of discrete parallel Silicon Carbide (SiC) MOSFETs. This unbalance is unavoidable and should be limited in order to exploit all the advantages offered by SiC semiconductors over Si counterparts as far as possible. This effort aims to optimize the operation of converters in medium and high-power density applications. Such applications are converters for photovoltaic power generation, electric vehicles, high-power density motor drives, smart grids, solid-state transformers for distribution network, HVDC transmission, railway systems, etc. SiC MOSFET, as one of the Wide Band Gap (WBG) devices, has become increasingly popular in the aforementioned applications because of its superior characteristics and the increasing demands for higher efficiency and reliability, higher limits of power density, lower weight/volume packages and higher th...","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121271035","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. Castañeda, A. Aristizabal, J. Cherni, I. Dyner, S. Zapata
In the late 1980s, Argentina faced frequent blackouts due to a lack of investment in generation capacity and high electricity demand growth. Argentina was one of the first developing countries to implement the liberalisation and privatisation of public utilities. In 2015, the Argentine electricity market faced a crisis due to low capacity investment. This arose from consumer prices that poorly reflected the true electricity cost, increasing risk for companies to invest in new generation capacity. Since 2016, Argentine government has called an auction to increase generation capacity; in addition, the government has cut incentive to consumers looking for reduce the electricity demand. Moreover, Argentina’s government is promoting policies to increase renewable energy share. However, it is unknown how renewable energies may affect security of supply and electricity price. This paper presents a simulation model to analyse policies for increasing generation capacity and promote renewable energy in Argentina. In this paper is concluded that renewable energies do indeed reduce the energy dependency of fossil fuels, and they lead to reduce electricity prices.In the late 1980s, Argentina faced frequent blackouts due to a lack of investment in generation capacity and high electricity demand growth. Argentina was one of the first developing countries to implement the liberalisation and privatisation of public utilities. In 2015, the Argentine electricity market faced a crisis due to low capacity investment. This arose from consumer prices that poorly reflected the true electricity cost, increasing risk for companies to invest in new generation capacity. Since 2016, Argentine government has called an auction to increase generation capacity; in addition, the government has cut incentive to consumers looking for reduce the electricity demand. Moreover, Argentina’s government is promoting policies to increase renewable energy share. However, it is unknown how renewable energies may affect security of supply and electricity price. This paper presents a simulation model to analyse policies for increasing generation capacity and promote renewable energy in Argentina. I...
{"title":"Assessing renewable energy policy integration cost, emissions and affordability","authors":"M. Castañeda, A. Aristizabal, J. Cherni, I. Dyner, S. Zapata","doi":"10.1063/1.5138490","DOIUrl":"https://doi.org/10.1063/1.5138490","url":null,"abstract":"In the late 1980s, Argentina faced frequent blackouts due to a lack of investment in generation capacity and high electricity demand growth. Argentina was one of the first developing countries to implement the liberalisation and privatisation of public utilities. In 2015, the Argentine electricity market faced a crisis due to low capacity investment. This arose from consumer prices that poorly reflected the true electricity cost, increasing risk for companies to invest in new generation capacity. Since 2016, Argentine government has called an auction to increase generation capacity; in addition, the government has cut incentive to consumers looking for reduce the electricity demand. Moreover, Argentina’s government is promoting policies to increase renewable energy share. However, it is unknown how renewable energies may affect security of supply and electricity price. This paper presents a simulation model to analyse policies for increasing generation capacity and promote renewable energy in Argentina. In this paper is concluded that renewable energies do indeed reduce the energy dependency of fossil fuels, and they lead to reduce electricity prices.In the late 1980s, Argentina faced frequent blackouts due to a lack of investment in generation capacity and high electricity demand growth. Argentina was one of the first developing countries to implement the liberalisation and privatisation of public utilities. In 2015, the Argentine electricity market faced a crisis due to low capacity investment. This arose from consumer prices that poorly reflected the true electricity cost, increasing risk for companies to invest in new generation capacity. Since 2016, Argentine government has called an auction to increase generation capacity; in addition, the government has cut incentive to consumers looking for reduce the electricity demand. Moreover, Argentina’s government is promoting policies to increase renewable energy share. However, it is unknown how renewable energies may affect security of supply and electricity price. This paper presents a simulation model to analyse policies for increasing generation capacity and promote renewable energy in Argentina. I...","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128447975","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}
This study aims to determine most stable isobar from some isobaric elements with mass number (A= 50-65 & 180-195). This aim achieved by, firstly: plot mass parabolas for these isobaric family, second: calculated the atomic number for most stable isobar (ZA) value. To plot the mass parabola, the binding energy (B.E) calculated from semi empirical formula for these isobars. The mass number (A) plotted as a function to the (ZA) for each range; we get a linear relationship between them. An empirical formula for the most stable isobar has been developed from this linear dependence. From the results, we can see that mass parabolas for isobaric elements with odd mass number (A) are different from the mass parabolas of even mass number (A) isobars, so there is only one stable nuclides for odd (A) while for even (A) there is more than one stable nuclide.
{"title":"Study mass parabola and most stable isobar from some isobaric nuclides","authors":"Murtadha S. Nayyef, Naz T. Jarallah","doi":"10.1063/1.5138493","DOIUrl":"https://doi.org/10.1063/1.5138493","url":null,"abstract":"This study aims to determine most stable isobar from some isobaric elements with mass number (A= 50-65 & 180-195). This aim achieved by, firstly: plot mass parabolas for these isobaric family, second: calculated the atomic number for most stable isobar (ZA) value. To plot the mass parabola, the binding energy (B.E) calculated from semi empirical formula for these isobars. The mass number (A) plotted as a function to the (ZA) for each range; we get a linear relationship between them. An empirical formula for the most stable isobar has been developed from this linear dependence. From the results, we can see that mass parabolas for isobaric elements with odd mass number (A) are different from the mass parabolas of even mass number (A) isobars, so there is only one stable nuclides for odd (A) while for even (A) there is more than one stable nuclide.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130402199","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}
Nikolaos Korakianitis, G. Vokas, Georgios Ioannides
This paper attempts to provide a review of wireless charging technologies suitable for electric vehicles (EVs) charging. Inductive Power Transfer (IPT) and strongly coupled magnetic resonance technologies are chosen for detailed review. Different cases of WPT technologies, their principle of operation and equivalent circuit based analysis is carried out. Compensation strategies and their effectiveness are reviewed. Design trends of coil systems for electric cars have been referenced. In addition, this paper presents special issues related to WPT and EV applications, the shielding methods, the Solar Power Satellite (SPS), the Roadway Powered Electric Vehicles (RPEVs) and the Online Electric Vehicles (OLEVs). Finally, recommendations and conclusions are made, based on the study and analysis of the available literature showing the trends on the wireless power transfer of EVs.This paper attempts to provide a review of wireless charging technologies suitable for electric vehicles (EVs) charging. Inductive Power Transfer (IPT) and strongly coupled magnetic resonance technologies are chosen for detailed review. Different cases of WPT technologies, their principle of operation and equivalent circuit based analysis is carried out. Compensation strategies and their effectiveness are reviewed. Design trends of coil systems for electric cars have been referenced. In addition, this paper presents special issues related to WPT and EV applications, the shielding methods, the Solar Power Satellite (SPS), the Roadway Powered Electric Vehicles (RPEVs) and the Online Electric Vehicles (OLEVs). Finally, recommendations and conclusions are made, based on the study and analysis of the available literature showing the trends on the wireless power transfer of EVs.
{"title":"Review of wireless power transfer (WPT) on electric vehicles (EVs) charging","authors":"Nikolaos Korakianitis, G. Vokas, Georgios Ioannides","doi":"10.1063/1.5138558","DOIUrl":"https://doi.org/10.1063/1.5138558","url":null,"abstract":"This paper attempts to provide a review of wireless charging technologies suitable for electric vehicles (EVs) charging. Inductive Power Transfer (IPT) and strongly coupled magnetic resonance technologies are chosen for detailed review. Different cases of WPT technologies, their principle of operation and equivalent circuit based analysis is carried out. Compensation strategies and their effectiveness are reviewed. Design trends of coil systems for electric cars have been referenced. In addition, this paper presents special issues related to WPT and EV applications, the shielding methods, the Solar Power Satellite (SPS), the Roadway Powered Electric Vehicles (RPEVs) and the Online Electric Vehicles (OLEVs). Finally, recommendations and conclusions are made, based on the study and analysis of the available literature showing the trends on the wireless power transfer of EVs.This paper attempts to provide a review of wireless charging technologies suitable for electric vehicles (EVs) charging. Inductive Power Transfer (IPT) and strongly coupled magnetic resonance technologies are chosen for detailed review. Different cases of WPT technologies, their principle of operation and equivalent circuit based analysis is carried out. Compensation strategies and their effectiveness are reviewed. Design trends of coil systems for electric cars have been referenced. In addition, this paper presents special issues related to WPT and EV applications, the shielding methods, the Solar Power Satellite (SPS), the Roadway Powered Electric Vehicles (RPEVs) and the Online Electric Vehicles (OLEVs). Finally, recommendations and conclusions are made, based on the study and analysis of the available literature showing the trends on the wireless power transfer of EVs.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121230198","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}
One of the most important developments in modern medicine is the use of carbon ion in the treatment of tumors, where the Carbon ion is adorable in the treatment because it deposits its energy deeply specific into the tissue therefore, in order to control the killing of cancer cells in tissues, should be provided an accurate description of the energy loss from carbon ion within lung tissue. The interactions of carbon ion with matter were studied and the mass stopping powers of carbon ion with lung tissue, were calculated by using Beth-Bloch equation and (SRIM, CasP, PASS) software. Also the range and liner energy transfer (LET) and the depth of penetration of carbon ion in lung tissue. As well as Dose and Dose equivalent for this ion were calculated by using Mat lab language with energy interval (0.025-1000) MeV.One of the most important developments in modern medicine is the use of carbon ion in the treatment of tumors, where the Carbon ion is adorable in the treatment because it deposits its energy deeply specific into the tissue therefore, in order to control the killing of cancer cells in tissues, should be provided an accurate description of the energy loss from carbon ion within lung tissue. The interactions of carbon ion with matter were studied and the mass stopping powers of carbon ion with lung tissue, were calculated by using Beth-Bloch equation and (SRIM, CasP, PASS) software. Also the range and liner energy transfer (LET) and the depth of penetration of carbon ion in lung tissue. As well as Dose and Dose equivalent for this ion were calculated by using Mat lab language with energy interval (0.025-1000) MeV.
{"title":"Energy loss of carbon ion in lung tissue","authors":"Zeena J. Raheem, B. M. Saied","doi":"10.1063/1.5138507","DOIUrl":"https://doi.org/10.1063/1.5138507","url":null,"abstract":"One of the most important developments in modern medicine is the use of carbon ion in the treatment of tumors, where the Carbon ion is adorable in the treatment because it deposits its energy deeply specific into the tissue therefore, in order to control the killing of cancer cells in tissues, should be provided an accurate description of the energy loss from carbon ion within lung tissue. The interactions of carbon ion with matter were studied and the mass stopping powers of carbon ion with lung tissue, were calculated by using Beth-Bloch equation and (SRIM, CasP, PASS) software. Also the range and liner energy transfer (LET) and the depth of penetration of carbon ion in lung tissue. As well as Dose and Dose equivalent for this ion were calculated by using Mat lab language with energy interval (0.025-1000) MeV.One of the most important developments in modern medicine is the use of carbon ion in the treatment of tumors, where the Carbon ion is adorable in the treatment because it deposits its energy deeply specific into the tissue therefore, in order to control the killing of cancer cells in tissues, should be provided an accurate description of the energy loss from carbon ion within lung tissue. The interactions of carbon ion with matter were studied and the mass stopping powers of carbon ion with lung tissue, were calculated by using Beth-Bloch equation and (SRIM, CasP, PASS) software. Also the range and liner energy transfer (LET) and the depth of penetration of carbon ion in lung tissue. As well as Dose and Dose equivalent for this ion were calculated by using Mat lab language with energy interval (0.025-1000) MeV.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127832911","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}
To supplant a missing tooth, plenty of materials, for example, cobalt-chromium (Co–Cr) and treated steel, had been aimed to make an implant. The advancement of materials science and modification improved the materials for implant application. These days, Ti turns into the most prominent implanted material because of its favorable circumstances. Probity, Ti is broadly and effectively utilized as an implant material fundamentally because of different elements. Ti is naturally dormant, ready to bond with osteoblasts and has magnificent biocompatibility. In this research, all the samples are prepared using the powder technique and the preparation process included adding silver element to the commercially pure titanium at different weight percent of (10, 20 and 30) to explore the influence of introducing the silver element into the commercially pure titanium on the microstructure, mechanical properties of the produced specimens. There are two sets of silver-titanium alloys sintering on different temperatures first set on 900 °C and the other on 700 °C. Microstructures analysis stated that at silver content of (10-20 wt%) single phase of (α-Ti alloy), as the silver content increased to (30% Wt), in addition to (α-phase), (Ti2Ag) intermetallic compound developed in the alloy microstructure, and the hardness test result best hardness of titanium-silver alloys is with silver content of (30% Wt) at sintering temperature of 900 °C.To supplant a missing tooth, plenty of materials, for example, cobalt-chromium (Co–Cr) and treated steel, had been aimed to make an implant. The advancement of materials science and modification improved the materials for implant application. These days, Ti turns into the most prominent implanted material because of its favorable circumstances. Probity, Ti is broadly and effectively utilized as an implant material fundamentally because of different elements. Ti is naturally dormant, ready to bond with osteoblasts and has magnificent biocompatibility. In this research, all the samples are prepared using the powder technique and the preparation process included adding silver element to the commercially pure titanium at different weight percent of (10, 20 and 30) to explore the influence of introducing the silver element into the commercially pure titanium on the microstructure, mechanical properties of the produced specimens. There are two sets of silver-titanium alloys sintering on different temperatures f...
{"title":"Effect of Ag addition on Cp-Ti dental implant","authors":"Wehad A. Al-Rawy, E. Al-Hassani","doi":"10.1063/1.5138503","DOIUrl":"https://doi.org/10.1063/1.5138503","url":null,"abstract":"To supplant a missing tooth, plenty of materials, for example, cobalt-chromium (Co–Cr) and treated steel, had been aimed to make an implant. The advancement of materials science and modification improved the materials for implant application. These days, Ti turns into the most prominent implanted material because of its favorable circumstances. Probity, Ti is broadly and effectively utilized as an implant material fundamentally because of different elements. Ti is naturally dormant, ready to bond with osteoblasts and has magnificent biocompatibility. In this research, all the samples are prepared using the powder technique and the preparation process included adding silver element to the commercially pure titanium at different weight percent of (10, 20 and 30) to explore the influence of introducing the silver element into the commercially pure titanium on the microstructure, mechanical properties of the produced specimens. There are two sets of silver-titanium alloys sintering on different temperatures first set on 900 °C and the other on 700 °C. Microstructures analysis stated that at silver content of (10-20 wt%) single phase of (α-Ti alloy), as the silver content increased to (30% Wt), in addition to (α-phase), (Ti2Ag) intermetallic compound developed in the alloy microstructure, and the hardness test result best hardness of titanium-silver alloys is with silver content of (30% Wt) at sintering temperature of 900 °C.To supplant a missing tooth, plenty of materials, for example, cobalt-chromium (Co–Cr) and treated steel, had been aimed to make an implant. The advancement of materials science and modification improved the materials for implant application. These days, Ti turns into the most prominent implanted material because of its favorable circumstances. Probity, Ti is broadly and effectively utilized as an implant material fundamentally because of different elements. Ti is naturally dormant, ready to bond with osteoblasts and has magnificent biocompatibility. In this research, all the samples are prepared using the powder technique and the preparation process included adding silver element to the commercially pure titanium at different weight percent of (10, 20 and 30) to explore the influence of introducing the silver element into the commercially pure titanium on the microstructure, mechanical properties of the produced specimens. There are two sets of silver-titanium alloys sintering on different temperatures f...","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125470385","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}
Gold nanoparticles (AuNPs) have been widely used and applied in science, biotechnology and medicine fields because they have many unique properties including their ease synthesis, optical characteristics and chemical stability. The purpose of the present study was focused to investigate the advantages of AuNPs in reduction of estradiol hormone and might employed this phenomenon to treat breast cancer across reducing this hormone and amplification of their effects across irradiation with x-rays. A total number of the subjects included in this study was 15 women and all ages were ranged between 18 to 22 years old. The serum derived from blood samples of women were sub-divided into two groups ; the first group was served as a control group and the second group was firstly mixed with AuNPs for 24 hours and then irradiated with x - rays (5 Gy). The data obtained from the present study showed a significant decrease (p 0.05). In conclusion, the AuNPs have ability to reduce estradiol hormone because of generation of free radicals and drop of antioxidant system and these effects can be amplified and potentiated through exposure to moderate dose of x-rays.
{"title":"Gold nanoparticles and x-rays cause estradiol hormone reduction across oxidative stress of blood samples in vitro","authors":"Baydaa Al-Hamawandy, Maha Taha Idrees, Z. Yahia","doi":"10.1063/1.5138575","DOIUrl":"https://doi.org/10.1063/1.5138575","url":null,"abstract":"Gold nanoparticles (AuNPs) have been widely used and applied in science, biotechnology and medicine fields because they have many unique properties including their ease synthesis, optical characteristics and chemical stability. The purpose of the present study was focused to investigate the advantages of AuNPs in reduction of estradiol hormone and might employed this phenomenon to treat breast cancer across reducing this hormone and amplification of their effects across irradiation with x-rays. A total number of the subjects included in this study was 15 women and all ages were ranged between 18 to 22 years old. The serum derived from blood samples of women were sub-divided into two groups ; the first group was served as a control group and the second group was firstly mixed with AuNPs for 24 hours and then irradiated with x - rays (5 Gy). The data obtained from the present study showed a significant decrease (p 0.05). In conclusion, the AuNPs have ability to reduce estradiol hormone because of generation of free radicals and drop of antioxidant system and these effects can be amplified and potentiated through exposure to moderate dose of x-rays.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132178221","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}
Hybrid rocket engines represent a propulsion system which at the moment needs to be improved by two ways: NOx and CO pollutant reduction together with safety and cost issues. In present paper there is represented a comparison between different fuels upon the combustion parameters. For this purpose there are assumed different input values from experimental tests. Presented case it is a necessary step to achieve improvements in hybrid rocket engines design and development, starting from the analysis of regression rates for different fuels like HTPB, paraffin, HTPB+AL, PE Wax. Early versions of hybrid rockets were not used at large scale either for commercial or military domain, main reason is that they had a slow fuel regression rate and a reduced combustion efficiency. To increase the regression rates it is necessary to increase the flow rate of pyrolyzed fuel, this way also increasing the thrust level. At the actual stage, the regression rate for the fuels based on polymers are higher than the conventional fuel used in hybrid rocket engines.
{"title":"Comparative analysis regarding burning process for different fuels in hybrid rocket engines","authors":"S. Predoi, Ș. Grigorean, G. Dumitraşcu","doi":"10.1063/1.5138585","DOIUrl":"https://doi.org/10.1063/1.5138585","url":null,"abstract":"Hybrid rocket engines represent a propulsion system which at the moment needs to be improved by two ways: NOx and CO pollutant reduction together with safety and cost issues. In present paper there is represented a comparison between different fuels upon the combustion parameters. For this purpose there are assumed different input values from experimental tests. Presented case it is a necessary step to achieve improvements in hybrid rocket engines design and development, starting from the analysis of regression rates for different fuels like HTPB, paraffin, HTPB+AL, PE Wax. Early versions of hybrid rockets were not used at large scale either for commercial or military domain, main reason is that they had a slow fuel regression rate and a reduced combustion efficiency. To increase the regression rates it is necessary to increase the flow rate of pyrolyzed fuel, this way also increasing the thrust level. At the actual stage, the regression rate for the fuels based on polymers are higher than the conventional fuel used in hybrid rocket engines.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114563827","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}
Abstract. Chitosan and Chitosan: PAN blend with different PAN weight ratios (1, 2, 3, 4 and 5%) were prepared by solution casting method. The structural and mechanical properties for prepared samples were done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and strain stress test. The XRD measurements indicate the formation of the blend by the variation of inter-planer distances. Also, the shift in some FTIR bands energy for polysaccharides and reduce their intensities indicate the formation of Chitosan:PAN blend. The largest tensile appeared at 1% PAN ratio. The chitosan/PAN blends were examined their antibacterial activity using the inhibition concentration method. The results show different grades of activity at the different samples. The highest inhibition of the bacteria for Chitosan/PAN blend at a 1% blend ratio. The blend has less effectiveness against gram-positive bacteria than gram-negative.Abstract. Chitosan and Chitosan: PAN blend with different PAN weight ratios (1, 2, 3, 4 and 5%) were prepared by solution casting method. The structural and mechanical properties for prepared samples were done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and strain stress test. The XRD measurements indicate the formation of the blend by the variation of inter-planer distances. Also, the shift in some FTIR bands energy for polysaccharides and reduce their intensities indicate the formation of Chitosan:PAN blend. The largest tensile appeared at 1% PAN ratio. The chitosan/PAN blends were examined their antibacterial activity using the inhibition concentration method. The results show different grades of activity at the different samples. The highest inhibition of the bacteria for Chitosan/PAN blend at a 1% blend ratio. The blend has less effectiveness against gram-positive bacteria than gram-negative.
{"title":"Antibacterial activity of chitosan/PAN blend prepared at different ratios","authors":"H. Mahmood, M. Jawad","doi":"10.1063/1.5138564","DOIUrl":"https://doi.org/10.1063/1.5138564","url":null,"abstract":"Abstract. Chitosan and Chitosan: PAN blend with different PAN weight ratios (1, 2, 3, 4 and 5%) were prepared by solution casting method. The structural and mechanical properties for prepared samples were done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and strain stress test. The XRD measurements indicate the formation of the blend by the variation of inter-planer distances. Also, the shift in some FTIR bands energy for polysaccharides and reduce their intensities indicate the formation of Chitosan:PAN blend. The largest tensile appeared at 1% PAN ratio. The chitosan/PAN blends were examined their antibacterial activity using the inhibition concentration method. The results show different grades of activity at the different samples. The highest inhibition of the bacteria for Chitosan/PAN blend at a 1% blend ratio. The blend has less effectiveness against gram-positive bacteria than gram-negative.Abstract. Chitosan and Chitosan: PAN blend with different PAN weight ratios (1, 2, 3, 4 and 5%) were prepared by solution casting method. The structural and mechanical properties for prepared samples were done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and strain stress test. The XRD measurements indicate the formation of the blend by the variation of inter-planer distances. Also, the shift in some FTIR bands energy for polysaccharides and reduce their intensities indicate the formation of Chitosan:PAN blend. The largest tensile appeared at 1% PAN ratio. The chitosan/PAN blends were examined their antibacterial activity using the inhibition concentration method. The results show different grades of activity at the different samples. The highest inhibition of the bacteria for Chitosan/PAN blend at a 1% blend ratio. The blend has less effectiveness against gram-positive bacteria than gram-negative.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114934799","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}
Muhammed Abdul Kadar Abdul Sttar, A. Mkhaiber, A. R. A. Majeed
In this study, some attenuation properties of gamma shields were studied. This shields consisting of composite materials of Unsaturated polyester as a base material and bismuth(Bi) but in different size (Bi2O3) and, micro bismuth (Bi) as reinforcement materials at different percentages (1, 3,5,7 and 9)wt%, and with different thickness (1, 1.5, 2, 2.5, 3, 3.5 and 4) cm. The results showed that the use of nanoparticles in the field of radiation shielding is better than the microparticales. It has been shown that the values of linear attenuation coefficients in the case of nanoparticles were greater than the attenuation coefficient in the case of the use of micro material. Also, the result show that the half value thickness and the dose rate is less than in the case of nanoparticle.
{"title":"Study of the effect of using nanomaterial in radiological shielding","authors":"Muhammed Abdul Kadar Abdul Sttar, A. Mkhaiber, A. R. A. Majeed","doi":"10.1063/1.5138563","DOIUrl":"https://doi.org/10.1063/1.5138563","url":null,"abstract":"In this study, some attenuation properties of gamma shields were studied. This shields consisting of composite materials of Unsaturated polyester as a base material and bismuth(Bi) but in different size (Bi2O3) and, micro bismuth (Bi) as reinforcement materials at different percentages (1, 3,5,7 and 9)wt%, and with different thickness (1, 1.5, 2, 2.5, 3, 3.5 and 4) cm. The results showed that the use of nanoparticles in the field of radiation shielding is better than the microparticales. It has been shown that the values of linear attenuation coefficients in the case of nanoparticles were greater than the attenuation coefficient in the case of the use of micro material. Also, the result show that the half value thickness and the dose rate is less than in the case of nanoparticle.","PeriodicalId":186251,"journal":{"name":"TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127200001","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：