نقاط کوانتومی کربن و گرافن دارای خواص نوری و الکتریکی فوق العاده ای به دلیل خواص کوانتومی منحصر به فردشان هستند و
این آنها را به مواد شگفت انگیزی برای کاربرد در دستگاههای فوتوولتاییک تبدیل میکند. تطبیق پذیری این مواد منجر به استفاده
از آنها به عنوان الکترون/حفره در نقاط کوانتومی سیلیکون، پلیمرها و یا سلول های خورشیدی حساس به رنگ شده است. در این مقاله،
کارهای انجام شده و نتایج سنتزهای مختلف مورد بررسی قرار داده شد. با وجود خواص نوری عالی آنها در فتوولتائیک و همچنین سلولهای
خورشیدی، نقاط کوانتومی بر پایه غیرکربن خوب عمل نکرده اند و بررسی جامعی از نقاط پایه کربن استفاده شده در فوتوولتاییک انجام
نشده است. بنابراین، در تلاش برای درک اینکه چرا این نانوساختار تا به حال موفق به تحقق بخشیدن به توانایی های خود نشده است، در
این بررسی دستاوردهای اصلی در ارتباط بین عملکرد و سنتز مواد تحلیل شده است
TEM, Transmission Electron Microscopy & Diffraction Patterns, by Mr. GovahiMohamadreza Govahi
Language: Persian/Farsi
Title: TEM, Transmission Electron Microscopy & Diffraction Patterns
Persian Title: میکروسکوپ الکترونی عبوری و الگوهای پراش
Editor: Eng.Mohamadreza Govahi
Mentor: Dr. Kazem Tahmasebi
Semnan PN University , 2015.
The effect of nanoparticle size on optical parameters and cellular toxicity i...mohamadamiri5
در تشخیص خطرات سلامتی مرتبط با نانومواد جدید باید متغیرهایی
که سمیت را تحت تاثیر قرار میدهند از جمله اندازه ذرات به صورت جداگانه ارزیابی کرد. نانوذرات بر خلاف ذرات بزرگتر با عبور از
غشاهای بیولوژیک قادر به دسترسی به سلولها، بافتها و اندامها هستند.در این پژوهش تجربی، پس از سنتز نانوذرات نقره و مشخصه یابی پارامترهای اپتیکی از جمله طیف جذبی، ماندگاری ذرات و
تأثیرات عملکرد آنها بر تغییرات خواص بیوشیمیایی خون نظیر آلکالین فسفاتاز آلبومین و پروتوئین توتال پرداخته شده است. با
توجه به اندازه گیری انجام شده در این پژوهش، مشخص شد که گروه تجربی نقره نسبت به گروه کنترل( گروهی که هیچ ماده ای به آنها
تزریق نشده است) افزایش سمیت سلولی داشته اند
X-rays make up X-radiation, a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning Röntgen radiation, after the German scientist Wilhelm Röntgen who discovered these on November 8, 1895, who usually is credited as its discoverer, and who named it X-radiation to signify an unknown type of radiation.Spelling of X-ray(s) in the English language includes the variants x-ray(s), xray(s), and X ray(s).
We tried to explain and analyze the latest cutting-edge technologies in nanophotonic materials workshop. The subjects were around :
1) quantum confinement
2) nano materials
3) synthesis methods
4) applications (laser, sensors, solar cells, medical, ...)
5) promising nano materials and methods
6) NEMS & MEMS
7) Ideas and latest interesting researches
Master instructor of nanophotonic materials workshop (D234165), "Inv. Ali Bakhshi".
TEM, Transmission Electron Microscopy & Diffraction Patterns, by Mr. GovahiMohamadreza Govahi
Language: Persian/Farsi
Title: TEM, Transmission Electron Microscopy & Diffraction Patterns
Persian Title: میکروسکوپ الکترونی عبوری و الگوهای پراش
Editor: Eng.Mohamadreza Govahi
Mentor: Dr. Kazem Tahmasebi
Semnan PN University , 2015.
The effect of nanoparticle size on optical parameters and cellular toxicity i...mohamadamiri5
در تشخیص خطرات سلامتی مرتبط با نانومواد جدید باید متغیرهایی
که سمیت را تحت تاثیر قرار میدهند از جمله اندازه ذرات به صورت جداگانه ارزیابی کرد. نانوذرات بر خلاف ذرات بزرگتر با عبور از
غشاهای بیولوژیک قادر به دسترسی به سلولها، بافتها و اندامها هستند.در این پژوهش تجربی، پس از سنتز نانوذرات نقره و مشخصه یابی پارامترهای اپتیکی از جمله طیف جذبی، ماندگاری ذرات و
تأثیرات عملکرد آنها بر تغییرات خواص بیوشیمیایی خون نظیر آلکالین فسفاتاز آلبومین و پروتوئین توتال پرداخته شده است. با
توجه به اندازه گیری انجام شده در این پژوهش، مشخص شد که گروه تجربی نقره نسبت به گروه کنترل( گروهی که هیچ ماده ای به آنها
تزریق نشده است) افزایش سمیت سلولی داشته اند
X-rays make up X-radiation, a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning Röntgen radiation, after the German scientist Wilhelm Röntgen who discovered these on November 8, 1895, who usually is credited as its discoverer, and who named it X-radiation to signify an unknown type of radiation.Spelling of X-ray(s) in the English language includes the variants x-ray(s), xray(s), and X ray(s).
We tried to explain and analyze the latest cutting-edge technologies in nanophotonic materials workshop. The subjects were around :
1) quantum confinement
2) nano materials
3) synthesis methods
4) applications (laser, sensors, solar cells, medical, ...)
5) promising nano materials and methods
6) NEMS & MEMS
7) Ideas and latest interesting researches
Master instructor of nanophotonic materials workshop (D234165), "Inv. Ali Bakhshi".
Dr.Hamidreza Jalalian Born July 25, 1339 in Tehran, graduated from the University of Berkeley in 1982 and graduated from Stanford University in 1983, a Ph.D. in Energy Conversion and Quantum Mechanics, a Ph.D. in Plasma, a Ph.D. in Mechanical Science, a Ph.D. in Harvard University Space Science Quantum Mechanisms, Royal College of English, Researchers at UNESCO, a researcher at Berkeley University, a Stanford University researcher at Harvard University
Environmental Impact Assessment of Electricity Generation in Wind Power Plant...J. Agricultural Machinery
Introduction
The world’s growing population has led to an inevitable increase in energy demand, and this, in addition to the depletion of non-renewable energy sources, can lead to several environmental issues. Wind power has proven to be a reliable and sustainable source of electricity, particularly in light of the pressing need to mitigate environmental impact and promote the use of renewable energy. The purpose of this research is to investigate and compare the environmental effects of electricity production from two wind power plants, Aqkand and Kahak, using wind turbines with a capacity of 2.5 megawatts for a period of three different lifetimes (20, 25, and 30 years).
Materials and Methods
The present study investigates the environmental effects of electricity generation during the life cycle of wind farms (Kahak and Aqkand) during the construction and operation of these power plants and the cumulative exergy demand index. The specifications of the wind turbines used in the current research are: turbine capacity of 2.5 MW, rotor diameter of 103 meters, rotor weight of 56 tonnes, three blades, each blade is 50.3 meters long and weighs 34.8 tonnes. The turbines are manufactured by Mapna and used in dry conditions. A functional unit of one kilowatt of electricity was selected and the data were analyzed in SIMAPRO software using IMPACT2002+ method with 15 midpoint indicators and four final indicators.
Results and Discussion
The results showed that the stage of raw materials and production has the highest impact on the creation of midpoint indicators, which is due to extraction, manufacturing, and production of parts such as steel casting using non-renewable energy and activities such as high-temperature welding. The total environmental index of Aqkand and Kahak wind power plants for 1 kWh of generated electricity was 5.84 and 4.45 μPt respectively, more than half of which belongs to the damage to human health category. The investigation of the ionizing radiation index showed that the use of diesel fuel in the installation phase resulted in the highest amount of emissions in both of the power plants, so the share of pollutant emissions in the raw materials and production phase is more than 40%, and in the installation phase due to diesel fuel consumption was more than 48%. The investigation of the eutrophication index showed that the raw materials and production stage accounted for more than 95% of the damage to the ecosystem quality category, and in the meantime, copper and electrical components had the highest amount of contribution to the raw materials and production stage. Additionally, diesel fuel accounted for the largest part of the result in the installation stage, and the transportation and maintenance stage included less than 1% of this result. The investigation of the renewable energy consumption index showed that the stage of raw materials and turbine production in the Aqkand power plant with a share of 68% and the Kahak power plant wi
Hello there, Here I 've uploaded a Nuclear Chemistry Presentation in persian (فارسی) language for dear researchers and readers. I hope you enjoy it and can satisfy your thoughts in Nuclear Chemistry.
Here we were taking a deeper look at Quantum Dots and Thin films. 2023
Principles (5 sections)
1) An Introduction (History, Physics, Classifications)
2) Synthesis and coating methods (Chemical and Physical methods, Novel methods)
3) Optical properties
4) Applications (Sensors, NEMS/MEMS (NOEMS/MOEMS))
5) Technologies and Inventions analysis
Dr.Hamidreza Jalalian Born July 25, 1339 in Tehran, graduated from the University of Berkeley in 1982 and graduated from Stanford University in 1983, a Ph.D. in Energy Conversion and Quantum Mechanics, a Ph.D. in Plasma, a Ph.D. in Mechanical Science, a Ph.D. in Harvard University Space Science Quantum Mechanisms, Royal College of English, Researchers at UNESCO, a researcher at Berkeley University, a Stanford University researcher at Harvard University
Environmental Impact Assessment of Electricity Generation in Wind Power Plant...J. Agricultural Machinery
Introduction
The world’s growing population has led to an inevitable increase in energy demand, and this, in addition to the depletion of non-renewable energy sources, can lead to several environmental issues. Wind power has proven to be a reliable and sustainable source of electricity, particularly in light of the pressing need to mitigate environmental impact and promote the use of renewable energy. The purpose of this research is to investigate and compare the environmental effects of electricity production from two wind power plants, Aqkand and Kahak, using wind turbines with a capacity of 2.5 megawatts for a period of three different lifetimes (20, 25, and 30 years).
Materials and Methods
The present study investigates the environmental effects of electricity generation during the life cycle of wind farms (Kahak and Aqkand) during the construction and operation of these power plants and the cumulative exergy demand index. The specifications of the wind turbines used in the current research are: turbine capacity of 2.5 MW, rotor diameter of 103 meters, rotor weight of 56 tonnes, three blades, each blade is 50.3 meters long and weighs 34.8 tonnes. The turbines are manufactured by Mapna and used in dry conditions. A functional unit of one kilowatt of electricity was selected and the data were analyzed in SIMAPRO software using IMPACT2002+ method with 15 midpoint indicators and four final indicators.
Results and Discussion
The results showed that the stage of raw materials and production has the highest impact on the creation of midpoint indicators, which is due to extraction, manufacturing, and production of parts such as steel casting using non-renewable energy and activities such as high-temperature welding. The total environmental index of Aqkand and Kahak wind power plants for 1 kWh of generated electricity was 5.84 and 4.45 μPt respectively, more than half of which belongs to the damage to human health category. The investigation of the ionizing radiation index showed that the use of diesel fuel in the installation phase resulted in the highest amount of emissions in both of the power plants, so the share of pollutant emissions in the raw materials and production phase is more than 40%, and in the installation phase due to diesel fuel consumption was more than 48%. The investigation of the eutrophication index showed that the raw materials and production stage accounted for more than 95% of the damage to the ecosystem quality category, and in the meantime, copper and electrical components had the highest amount of contribution to the raw materials and production stage. Additionally, diesel fuel accounted for the largest part of the result in the installation stage, and the transportation and maintenance stage included less than 1% of this result. The investigation of the renewable energy consumption index showed that the stage of raw materials and turbine production in the Aqkand power plant with a share of 68% and the Kahak power plant wi
Hello there, Here I 've uploaded a Nuclear Chemistry Presentation in persian (فارسی) language for dear researchers and readers. I hope you enjoy it and can satisfy your thoughts in Nuclear Chemistry.
Here we were taking a deeper look at Quantum Dots and Thin films. 2023
Principles (5 sections)
1) An Introduction (History, Physics, Classifications)
2) Synthesis and coating methods (Chemical and Physical methods, Novel methods)
3) Optical properties
4) Applications (Sensors, NEMS/MEMS (NOEMS/MOEMS))
5) Technologies and Inventions analysis
Review of the optical properties of carbon and graphene quantum dots
1. دومنور و هیثم ابن همایش ین
1
بر مروریخواصنقاط نوریکوانتومیکربنگرافن ودستگاه درف هایتوولتاییک
چکیده-کربن کوانتومی نقاطگرافن وخوادارایصای العاده فوق الکتریکی و نوریفرد به منحصر کوانتومی خواص دلیل بهشانهستندو
اینآنهادستگاه در کاربرد برایانگیزی شگفت مواد بهرا( فوتوولتاییک هایPVمی تبدیل ).کندپذیری تطبیقمواد ایناستفاده به منجر
آنازالکترون/حفره عنوان به هادرنقاطسیلیکو کوانتومینسلول یا و پلیمرها،،مقاله این در .است شده رنگ به حساس خورشیدی های
قرار بررسی موردمختلفسنتزهای نتایجو شده انجام کارهایشد داده.عالی نوری خواص وجود باسلولهای همچنین و فتوولتائیک در آنها
خورشیدی،نقاطپایه بر کوانتومیغیرکربنخوبان نکردهعملدود شده استفاده کربن پایه نقاط از جامعی بررسیرفوتوولتاییکانجام
است نشده.خود های توانایی به بخشیدن تحقق به موفق حال به تا نانوساختار این چرا اینکه درک برای تالشدر ،بنابرایناست نشدهدر ،
تحلیل موادسنتز و عملکرد بینارتباط در اصلی دستاوردهای بررسی ایناست شده.
:واژه کلیدسلولخورشیدی های،گرافن ،کربن ،فتوولتاییک ،کوانتومی نقطه
Review of the Optical Properties of Carbon and Graphene Quantum-Dots
in Photovoltaic Devices
Mohammad Amiri, Alireza Keshavarz
Department of Physics - Shiraz University of Technology
Abstract- Carbon quantum dots and Graphene quantum dots have fantastic Optical and Electrical, because of the unique
quantum properties, So this makes them singular materials for application in Photovoltaic devices (PV). Their versatility has
led to their being used as for holes or electrons, in silicon quantum dots, polymers or dye-sensitized Solar-Cells. In this paper,
we review thework done and theresult of various syntheses. Despitetheir excellent opticalproperties, they havenot performed
in photovoltaics as well as non-carbon-based quantum dot solar cells. As far as, no exhaustive review has been made of carbon-
based dots used in photovoltaics. Therefore, in an attempt to understand why these nanostructures have so far failed to realize
their potential, in this review we analyze the main achievements in the link between functionality and the synthesis of the
material.
Keywords: carbon; graphene; photovoltaics; quantum dots; solar cells
امیری محمدکشاورز علیرضا ،
فیزیک دانشکده-صنعتی دانشگاهشیراز