کنفرانس مهندسی مواد و متالورژی-کارگاه پوشش های نانویی- کانال نلنوتکنولوژی https://telegram.me/aslmfdm2fkifkg4nano5mfdfjrjgg9kk
Light-driven bioelectronic implants without batteries
(Nanowerk Spotlight) Benefitting from the miniaturization enabled by nanotechnologies, bioelectronics is a growing research field that is concerned with the convergence of biology and electronics: the application of biological materials and processes in electronics; and the use of electronic devices in living systems.
Among the latter, implantable bioelectronic devices wirelessly powered by different stimuli provide electrical impulses to precisely modulate the body's neural circuits – although wireless powering and remote manipulation still remain a major challenge for the practical use of these devices, which include retinal and cochlear implants; deep brain stimulators for epilepsy and Parkinson's disease; pacemakers; and brain-machine interfaces.
Adding to the options for wirelessly powering implants from outside the body, researchers in China are proposing a light-driven powering device using near infrared rays (nIR). Flashing light impulses, which are absorbed by the device, induce temperature fluctuation, thus generating voltage/current pulses which can be used for charging a battery or biological stimulations.
"Compared to the wireless power transport by electromagnetic coupling, near-infrared light with a wavelength of 760-1500 nm – known for its heating and medical physical therapy effects – provides an alternative wireless power that can penetrate into human tissue up to a depth of 4-10 cm," Prof. Hongzhong Liu and Dr. Weitao Jiang, from the State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, explain to Nanowerk.
Read more: Light-driven bioelectronic implants without batteries
http://www.nanowerk.com/spotlight/spotid=41787.php
(Nanowerk Spotlight) Benefitting from the miniaturization enabled by nanotechnologies, bioelectronics is a growing research field that is concerned with the convergence of biology and electronics: the application of biological materials and processes in electronics; and the use of electronic devices in living systems.
Among the latter, implantable bioelectronic devices wirelessly powered by different stimuli provide electrical impulses to precisely modulate the body's neural circuits – although wireless powering and remote manipulation still remain a major challenge for the practical use of these devices, which include retinal and cochlear implants; deep brain stimulators for epilepsy and Parkinson's disease; pacemakers; and brain-machine interfaces.
Adding to the options for wirelessly powering implants from outside the body, researchers in China are proposing a light-driven powering device using near infrared rays (nIR). Flashing light impulses, which are absorbed by the device, induce temperature fluctuation, thus generating voltage/current pulses which can be used for charging a battery or biological stimulations.
"Compared to the wireless power transport by electromagnetic coupling, near-infrared light with a wavelength of 760-1500 nm – known for its heating and medical physical therapy effects – provides an alternative wireless power that can penetrate into human tissue up to a depth of 4-10 cm," Prof. Hongzhong Liu and Dr. Weitao Jiang, from the State Key Laboratory for Manufacturing Systems Engineering at Xi'an Jiaotong University, explain to Nanowerk.
Read more: Light-driven bioelectronic implants without batteries
http://www.nanowerk.com/spotlight/spotid=41787.php
Nanowerk
Light-driven bioelectronic implants without batteries
Adding to the options for wirelessly powering implants from outside the body, researchers are proposing a light-driven powering device using near infrared rays (nIR). Flashing light impulses, which are absorbed by the device, induce temperature fluctuation…
3D graphene with high surface area and large mesopore volume
(Nanowerk Spotlight) The performance of batteries and supercapacitors depends on the density at which they can store energy and the speed at which they can be charged and discharged. These functions critically depend on the nanostructured electrodes that are used in these energy systems.
Porous carbon nanomaterials are widely employed as electrodes for supercapacitors and electrodes in commercial lithium ion batteries. Porous carbon, such as activated carbon, microporous carbon, and mesoporous carbon, usually has very high surface area and tunable porous structure but very poor electrical conductivity.
In contrast, sp2 carbon – graphene, fullerenes, and carbon nanotubes – exhibit high electrical conductivity but limited surface area.
"A carbon material with high electrical conductivity, high specific surface area, tunable pore structure, mechanically robust framework, and high chemical stability is an important requirement for advanced electrochemical energy storage," Dr. Qiang Zhang, an associate professor at the Department of Chemical Engineering at Tsinghua University, tells Nanowerk. "However, neither porous carbon or sp2 carbon can full meet these requirements yet."
How to create a conductive carbon material with especially large pore volume, and hence large surface area, has therefore been a key focus in electrode research.
Read more: 3D graphene with high surface area and large mesopore volume
http://www.nanowerk.com/spotlight/spotid=41510.php
(Nanowerk Spotlight) The performance of batteries and supercapacitors depends on the density at which they can store energy and the speed at which they can be charged and discharged. These functions critically depend on the nanostructured electrodes that are used in these energy systems.
Porous carbon nanomaterials are widely employed as electrodes for supercapacitors and electrodes in commercial lithium ion batteries. Porous carbon, such as activated carbon, microporous carbon, and mesoporous carbon, usually has very high surface area and tunable porous structure but very poor electrical conductivity.
In contrast, sp2 carbon – graphene, fullerenes, and carbon nanotubes – exhibit high electrical conductivity but limited surface area.
"A carbon material with high electrical conductivity, high specific surface area, tunable pore structure, mechanically robust framework, and high chemical stability is an important requirement for advanced electrochemical energy storage," Dr. Qiang Zhang, an associate professor at the Department of Chemical Engineering at Tsinghua University, tells Nanowerk. "However, neither porous carbon or sp2 carbon can full meet these requirements yet."
How to create a conductive carbon material with especially large pore volume, and hence large surface area, has therefore been a key focus in electrode research.
Read more: 3D graphene with high surface area and large mesopore volume
http://www.nanowerk.com/spotlight/spotid=41510.php
Nanowerk
3D graphene with high surface area and large mesopore volume
A carbon material with high electrical conductivity, high specific surface area, tunable pore structure, mechanically robust framework, and high chemical stability is an important requirement for advanced electrochemical energy storage. However, neither porous…
Climatic change on carbon nanotubes – Carbon nanotubes have many characteristics that promise to revolutionize the world of structural materials. There are different ways to grow carbon nanotubes, especially the CVD technique, which allows obtaining SWCNT’s on a silicon surface. These SWCNT can be carried from the silicon surface to another surface, as HOPG, without suffering changes on their properties. That means nanomanipulation of carbon nanotubes. (Mr Miguel Ângel Fernández Vindel, Universidad Autonoma de Madrid/Spain)
Read more: Nanotechnology Images and Pictures
Read more: Nanotechnology Images and Pictures
The imaged object is a single crystalline diamond grain that is anisotropically etched by hot spheres of molten nickel (red). Self-organized nickel particles are obtained by sintering a thin Ni film (100 nm) that is evaporated on a polished diamond substrate. Self-organisation and etching are conducted by the following annealing procedure: 1000°C in 500 mbar H2, 24 h. (Image: Waldemar Smirnov, Fraunhofer Institut Angewandte Festkörperphysik, Germany)
Read more: Nanotechnology Images and Pictures
Read more: Nanotechnology Images and Pictures
Nano PacMan made of copper oxide. Scanning electron microscope image of a copper oxide cluster, 3.5 microns in diameter, prepared by evaporation and condensation over an alumina substrate. The smiley nose and eye are present in the original SEM image, which has only been color-enhanced. (Image: Elisabetta Comini, University of Brescia, Italy)
Read more: Nanotechnology Images and Pictures
Read more: Nanotechnology Images and Pictures
دانشکده علوم و فناوریهای پزشکی شیراز در نظر دارد یک نفر عضو هیأت علمی به صورت ضریب K یا قرارداد آموزشی جهت گروه نانوفناوری پزشکی با شرایط زیر استخدام نماید.
1. فارغالتحصیل دکترای نانوفناوری پزشکی (افراد در حال تحصیل در صورتی که حداکثر تا تاریخ 30/9/94 فارغالتحصیل شوند مجاز به شرکت در فراخوان میباشند).
2. دارای شرایط عمومی استخدام باشند.
3. دانشگاه هیچگونه تعهدی نسبت به تبدیل وضعیت به پیمانی را ندارد.
4. تمدید قرارداد در انتهای سال اول منوط به فعالیت علمی قابل قبول سالانه و رضایت دانشکده و گروه آموزشی مربوطه میباشد. اطلاعات بیشتر: http://www.sums.ac.ir/fa/index.html?module=notice&uri=/fa/modules/notice/notice_0180.html
1. فارغالتحصیل دکترای نانوفناوری پزشکی (افراد در حال تحصیل در صورتی که حداکثر تا تاریخ 30/9/94 فارغالتحصیل شوند مجاز به شرکت در فراخوان میباشند).
2. دارای شرایط عمومی استخدام باشند.
3. دانشگاه هیچگونه تعهدی نسبت به تبدیل وضعیت به پیمانی را ندارد.
4. تمدید قرارداد در انتهای سال اول منوط به فعالیت علمی قابل قبول سالانه و رضایت دانشکده و گروه آموزشی مربوطه میباشد. اطلاعات بیشتر: http://www.sums.ac.ir/fa/index.html?module=notice&uri=/fa/modules/notice/notice_0180.html
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عنوان خبر : پاسخنامه های دکتری 95 وزارت بهداشت
پاسخنامه های دکتری 95 وزارت بهداشت
با سلام و خسته نباشید، به تمامی داوطلبان عزیز که آزمون دکترای تخصصی وزارت بهداشت را دادند. به امید کسب پیروزی بر این عزیزان.
از دوستان خواهشمند است جهت قرار گرفتن پاسخ های تشریحی بر روی این سایت و استفاده رایگان اکثریت داوطلبان از پاسخنامه های تشریحی سوالات را برای ما ایمیل و یا تصاویرشان را برای ما تلگرام کنند.
آدرس ما در تلگرام:
آدرس کانال آموزشی جهت عضویت در تلگرام:
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پاسخنامه های دکتری 95 وزارت بهداشت
با سلام و خسته نباشید، به تمامی داوطلبان عزیز که آزمون دکترای تخصصی وزارت بهداشت را دادند. به امید کسب پیروزی بر این عزیزان.
از دوستان خواهشمند است جهت قرار گرفتن پاسخ های تشریحی بر روی این سایت و استفاده رایگان اکثریت داوطلبان از پاسخنامه های تشریحی سوالات را برای ما ایمیل و یا تصاویرشان را برای ما تلگرام کنند.
آدرس ما در تلگرام:
آدرس کانال آموزشی جهت عضویت در تلگرام:
https://telegram.me/ysgeir
ایمیل:
bahri.mosa@gmail.com
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عنوان خبر : پاسخنامه های دکتری 95 وزارت بهداشت پاسخنامه های دکتری 95 وزارت بهداشت با سلام و خسته نباشید، به تمامی داوطلبان عزیز که آزمون دکترای تخصصی وزارت بهداشت را دادند. به امید کسب پیروزی بر این عزیزان. از دوستان خواهشمند است جهت قرار گرفتن پاسخ های…
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