Electron beams

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  • Transmission electron microscopy (TEM) is a technique where the electron-beam is transmitted through an ultra-thin specimen, interacting with specimen as it passes through it. An image is formed from the interaction of the electrons transmitted through the specimen, which is then magnified and focused onto an imaging device, such as a fluorescent screen, a photographic film, or a charge-coupled device (CCD) sensor. This technique is capable of imaging at significantly high resolution than the light microscopes, owing to the small de-Broglie wavelength of electrons....

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Chemical characterization of extra layers at the interfaces in MOCVD InGaP/GaAs junctions by electron beam methods

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Polystyrene negative resist for high-resolution electron beam lithography

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Kinetics of Si and Ge nanowires growth through electron beam evaporation

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  • Today, an individual would be hard-pressed to find any science field that does not employ methods and instruments based on the use of fine focused electron and ion beams. Well instrumented and supplemented with advanced methods and techniques, SEMs provide possibilities not only of surface imaging but quantitative measurement of object topologies, local electrophysical characteristics of semiconductor structures and performing elemental analysis.

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  • Advances in nanotechnology over the past decade have made scanning electron microscopy (SEM) an indispensable and powerful tool for analyzing and constructing new nanomaterials. Development of nanomaterials requires advanced techniques and skills to attain higher quality images, understand nanostructures, and improve synthesis strategies. A number of advancements in SEM such as field emission guns, electron back scatter detection (EBSD), and X-ray element mapping have improved nanomaterials analysis.

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  • Tham khảo sách 'scanning electron microscopy_3', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tham khảo sách 'scanning electron microscopy_1', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tham khảo sách 'scanning electron microscopy_4', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Sensor used in this project is MOC 7811 from Motorola. This is a slotted coupler/interrupter device. In each revolution as the beam is interrupted, the sensor generates a positive pulse. Microcontroller will execute interrupt routine, When a pulse occurs. Interrupt routine measures the total time taken for one revolution, divides it by 120, and stores the result into another timer, Configured in auto-reload mode. Now, the timer overflows after tiny intervals of time. Each time it overflows, next stored value is called from the lookup table, and displayed....

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  • Electron beam lithography (EBL) là thuật ngữ chỉ công nghệ tạo các chi tiết trên bề mặt (các phiến Si...) có kích thước và hình dạng giống như thiết kế bằng cách sử dụng chùm điện tử có năng lượng cao làm biến đổi các chất cản quang phủ trên bề mặt phiến. EBL là một công cụ phổ biến trong công nghệ nanô để tạo ra các chi tiết, các linh kiện có kích thước nhỏ với độ chính xác cực cao....

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  • Since its introduction in the early 1970s, computed tomography (CT) has become a robust modality to evaluate extracranial, thoracic, and abdominal vascular distributions. It has become a gold standard to non-invasively image the aorta, pulmonary arteries, great vessels, renal and peripheral arteries. However, cardiac anatomy evaluation with this modality was not possible, due to rapid cardiac motion and slow image acquisition times.

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  • Electrochemistry has been undergoing significant transformations in the last few decades. It is now the province of academics interested only in measuring thermodynamic properties of solutions and of industrialists using electrolysis or manufacturing batteries, with a huge gap between them. It has become clear that these, apparently distinct subjects, alongside others, have a common ground and that they have grown towards each other, particularly as a result of research into the rates of electrochemical processes....

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  • Radiotherapy, also referred to as radiation therapy, radiation oncology or therapeutic radiology, is one of the three principal modalities used in the treatment of malignant disease (cancer), the other two being surgery and chemotherapy.

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  • Incremental Analysis 6.002 Fall 2000 Lecture 7 1 .Review Nonlinear Analysis Analytical method Graphical method Today Incremental analysis Reading: Section 4.5 6.002 Fall 2000 Lecture 7 2 .Method 3: Incremental Analysis Motivation: music over a light beam Can we pull this off? iD iR vI (t ) + – + vD LED light intensity I D ∝ iD vI music signal AMP iR ∝ I R light intensity IR in photoreceiver LED: Light Emitting expoDweep ☺ t vI (t ) iD (t ) light iR (t ) sound nonlinear 6.002 Fall 2000 linear problem! will result in distortion Lecture 7 3 .

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  • Metal nanoparticles are certain to be the building blocks of the next generation of electronic, optoelectronic and chemical sensing devices. The physical limits imposed by top-down methods such as photo- and electron- beam lithography dictate that the synthesis and assembly of functional nanoscale materials will become the province of chemists.

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  • The World is confronted with a plethora of potentially disruptive technologies – some, such as nanotechnology, will inevitably challenge our cherished social, economic and industrial stability over the next two decades. Rational design and manufacture of materials properties through nanostructure control will profoundly affect the food we eat, the sources of water and power we use, our health services, our national security, housing, transportation, etc. Precisely what will be the ultimate effect of these disruptions is still unclear.

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  • Magnesium is the lightest of all the metals and the sixth most abundant on Earth. Magnesium is ductile and the most machinable of all the metals. Magnesium alloy developments have traditionally been driven by requirements for lightweight materials to operate under increasingly demanding conditions (magnesium alloy castings, wrought products, powder metallurgy components, office equipment, nuclear applications, flares, sacrificial anodes for the protection of other metals, flash photography and tools). The biggest potential market for magnesium alloys is in the automotive industry. ...

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành y học tạp chí Medical Sciences dành cho các bạn sinh viên ngành y tham khảo đề tài: Monte Carlo Commissioning of Low Energy Electron Radiotherapy Beams using NXEGS Software...

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  • Wang et al. Nanoscale Research Letters 2011, 6:367 http://www.nanoscalereslett.com/content/6/1/367 NANO EXPRESS Open Access Freestanding HfO2 grating fabricated by fast atom beam etching Yongjin Wang1,2*, Tong Wu2, Yoshiaki Kanamori2 and Kazuhiro Hane2 Abstract We report here the fabrication of freestanding HfO2 grating by combining fast atom beam etching (FAB) of HfO2 film with dry etching of silicon substrate. HfO2 film is deposited onto silicon substrate by electron beam evaporator.

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