The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Plasma flow control, based on plasma aerodynamic actuation (PAA), has become a newly-rising focus of international aerodynamic and thermodynamic fields. Nanosecond-pulse surface discharge is considered to be a new way of generating plasma aerodynamic actuation. When it comes to the practical application, the altitude at which plasma flow control is expected to be adopted is about 10–20km, where the...
We have developed an electrically driven photonic-crystal nanocavity laser with an ultra-low threshold current and a high temperature characteristic. Lasing is achieved under continuous-wave operation at high temperatures of up to 95°C.
The organic electric insulator polytetrafluoroethylene (PTFE) is used in aerospace industry under extreme conditions of temperature and electric field. The melting temperature of PTFE is about 327°C. In our days operating temperature of this kind of insulators could punctually reach 300°C and 350°C for the new generation machines. This last temperature is above the melting temperature of the material...
Graphene is a promising material for electronic applications due to its high mobility, low density of states, and monolayer thickness [1]. In order to realize practical devices [2], the interface properties between graphene and high-K dielectrics must be understood. However, due to the different nature of the bonding at the graphene / dielectric interface, techniques developed to study the Si/SiO2...
Edge characteristics of a tokamak plasma are of interest due to their importance in ITER (international thermonuclear experimental reactor). Especially, the particle flux and temperature after the ELM (edge localized mode) crash are of interest. In 2011 KSTAR campaign, plasma parameters such as the ion flux and electron temperature were measured at the far scrape-off layer (far-SOL) of tokamak plasma...
Antimonide based (Sb) compound semiconductors are promising for complementary logic applications due to their advantageous electron and hole transport properties. Ultra-thin device layers of compressively strained InSb are of particular interest for p-channel MOSFETs due to their reduced hole transport mass and higher mobility compared to strained InGaSb quantum well (QW) two dimensional hole gas...
In addition to through silicon vias (TSV), wafer bonding became one of the key process steps within 3D integration technologies that allows stacking image or MEMS sensor chips on top of ASIC. Depending on the package, the wafer bonded interface can be loaded by built-in residual stresses and the risk of defect generation and propagation — caused by stress corrosion of the highly loaded siloxane —...
In next generation sensing architectures, compact systems that could enhance manoeuvrability and at the same time diversify sensing capability is similarly carried out through pitch size reduction to incorporate more pixels per unit area. This is because integration of these sensors to its Si read-out circuits has to be technologically compatible for proper signal digitization. In the case of metal...
A new kind of cathode, LaC2-Mo cathode was prepared through spark plasma sintering method by using the mixed powder of LaC2 which was prepared by vacuum melting method and molybdenum. It was found that the emission properties of LaC2-Mo cathode increases with the LaC2 content increasing. The emission current density of LaC2-Mo cathode which contains 3.5wt.% LaC2 could reach 0.90A/cm2 at 1400b whereas...
Quantum Cascade Lasers (QCL) [1] are readily used sources in the mid-infrared serving mostly spectroscopic purposes, but also countermeasures and medical applications. For many of these purposes a single mode emission at a previously determined wavelength is required. This can be achieved for instance by adding Distributed-Feedback (DFB) [2] into the emitter. One approach to generate a DFB QCL is...
Boron nitride films for SAW devices were deposited on Si (100) wafers by RF magnetron sputtering. To prioritize the main influencing factors of the c-BN content, an orthogonal experiment was designed. The c-BN and h-BN phases in films are tested by Fourier transform infrared (FTIR); The surface morphologies of films are characterized by atomic force microscopy (AFM). Result of the FTIR indicates that...
In the present work we analyzed the influence of torch discharge plasma heterogeneity on the character of electromagnetic field attenuation along the discharge axis. A discharge burning in air at atmospheric pressure was analyzed. When taking discharge filament heterogeneity into account, two factors were considered: axial heterogeneity of discharge filament specific conductivity and diminishing of...
Coherent radio-frequency (RF) waves are routinely used for heating the plasma and for controlling the current profile in fusion plasmas. In ITER-like settings and beyond (DEMO) RF waves can significantly alter the particle distribution function away from an equilibrium Maxwell-Boltzmann distribution through wave-particle interactions in a global (non-resonant) as well local (resonant) manner. Meanwhile,...
A gaseous plasma in a non-local thermodynamic equilibrium (NLTE) can be characterized by the thermal disequilibrium Te ≠ Tex ≠ Tvib ≠ Trot ≠ Th, where Te and Th are respectively the translational temperatures respectively for the free electrons and heavy species, and Tex, Tvib, Trot are the internal temperatures respectively associated with the electronic, vibrational and rotational excited states...
The particle charge is an important parameter determining physical properties of complex plasmas, and has a significant influence on the thermal energy acquired by a dust particle due to various mechanisms. The magnitude of charge is crucial for particle trapping and levitation as well as for the formation of ordered dusty structures in a laboratory plasma.
Atmospheric pressure plasmas are investigated more and more in view of environmental en biomedical applications. One of the active species that are important for applications such as air cleaning is the OH radical1. This radical is ubiquitous in the water containing air plasmas and is very efficient due to its high oxidation potential.
There has been increasing use of atmospheric plasma for surface treatment and medical applications because the production of atmospheric pressure plasma at low temperatures - from room temperature to around 100°C - has been feasible for a number of years. Processing of materials that are sensitive to temperature, such as living bodies and polymer materials is not easy. In addition, most kinds of plasma...
Information about spatial correlation of the particles in nonideal systems is of great interest in various fields of science and technique. This information is necessary for calculation of various thermodynamic and transport characteristics on a base of known formulas of statistic physics. The pair correlation functions were studied experimentally for quasi-two-dimensional (2D) non-ideal systems....
This paper will focus on 300mm etch and CVD technologies for via reveal (VR) processing. Data on silicon etching will show that etch rates >5μm/min, with uniformity ±2.5% and selectivity to the liner oxide around ∼200:1 can be achieved on bonded TSV wafers. A novel end-point detection method will also be presented allowing control of the reveal height. The ability to tune the uniformity from centre...
In this paper, the polycrystalline CexPr1-xB6 (0≤x≤0.6)) bulks were successfully fabricated by spark plasma sintering (SPS). A lot of experiments are conducted to testing the mechanical and emission properties. The technological applications parameters are following: the sintering temperature is 1450°C, the sintering pressure is 50 MPa and the holding time is 5 min. The maximum pulse thermionic emission...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.