1 Introduction Traditional covert communication[1]usually relies on centralized channels,which are efficient in transmission but susceptible to eavesdropping and attacks,leading to information ***,distributed methods ...
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1 Introduction Traditional covert communication[1]usually relies on centralized channels,which are efficient in transmission but susceptible to eavesdropping and attacks,leading to information ***,distributed methods also exist,such as peer-to-peer networks and distributed hash *** technology,which is decentralized,anonymous,non-tamperable and anti-attack,can be applied to covert communication to solve the problems of traditional methods and improve the quality of communication.
Over the past decade,the power conversion efficiency of halide perovskite solar cells has shown a rapid increase to 26.1%.The significant efficiency growth and the relative simplification of the technology for o...
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Over the past decade,the power conversion efficiency of halide perovskite solar cells has shown a rapid increase to 26.1%.The significant efficiency growth and the relative simplification of the technology for obtaining thin-film solar cells due to liquid printing methods determine the high potential for the low-cost perovskite solar cells ***,efficient use of cell geometry is comparable to the size of standard crystalline-Si wafers(156:156 mm and more).Therefore,modular geometry similar to amorphous-Si solar cell approaches is used to scale perovskite solar *** electrical connection of thin-film cells requires precise processing of the conductive layers that form the device p-i-n *** subject of research is the development of a full pulsed laser scribing cycle for inverted perovskite solar *** this work,we propose a study of a laser-patterning technology In_(2)O_(3):SnO_(2)(ITO)conductive layer and a photoactive perovskite layer Cs0,2(CH(NH_(2))_(2))_(0,8)PbI_(3).Process regimes of transparent conducting electrodes based on ITO and halide perovskite layer Cs_(0,2)(CH(NH_(2))_(2))_(0,8)PbI_(3)laser patterning were *** optimal parameters for the multipass mode processing of ITO and perovskite layer were *** cell was electrically isolated at a scribe line width of 30μm.
It is found that single-cycle THz electromagnetic fields efficiently excite a GHz spin resonance mode in ferrimagnetic Tm3Fe5O12, despite the near absence of GHz spectral components in the exciting THz pulse. By analy...
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It is found that single-cycle THz electromagnetic fields efficiently excite a GHz spin resonance mode in ferrimagnetic Tm3Fe5O12, despite the near absence of GHz spectral components in the exciting THz pulse. By analyzing how the efficiency of excitation depends on the orientation and strength of the THz electric field, we show that it can be explained in terms of the nonlinear THz inverse Cotton-Mouton effect. Here, the THz electric field gets effectively rectified and acts on the ferrimagnetic spins as a unipolar effective magnetic field pulse. This interpretation is confirmed by a theoretical model based on the phenomenological analysis of the effective magnetic field, combined with the equations of motion derived from the effective Lagrangian for a ferrimagnet. Moreover, by using the outcome of two-dimensional THz spectroscopy, we conjecture a quantum-mechanical interpretation of the observed effect in terms of impulsive stimulated Raman scattering of THz photons by the crystal-field split f−f electronic transitions of Tm3+.
作者：
CHRISTOP.CATHE AUTHOR is Vice President of Technology and Manufacturing for Sperry Rand Corporation's Univac Federal Systems Division
St. Paul Minnesota. He holds a B. S. degree in Management Engineering from Rensselaer Polytechnic Institute. Mr. Christopher joined Univac in St. Paul in 1956 later moving to Division headquarters in suburban Philadelphia as Director of Operational Services and Planning. He became Director of Procurement and Administrative Services. Before returning to the Federal Systems Division in his present capacity he was general manager of the Univac Division operations in Utica-Ilion New York. In his present position
Mr. Christopher is responsible for engineering and programming factory operations (manufacturing) procurement advanced development program management and the Federal Systems Division's Salt Lake City Utah operations. In 1969 he was cited as Greater Utica's “Industrial Man of the Year.” Mr. Christopher is a member of the Society for the Advancement of Management and the Electronics Industries Association.
The benefits of data system computers to the Navy to date are developed to highlight the blessings. Both achievements and future requirements are discussed. The problems attendant on achievement of potential advantage...
The benefits of data system computers to the Navy to date are developed to highlight the blessings. Both achievements and future requirements are discussed. The problems attendant on achievement of potential advantages of data system computers, and the penalties of failure to liquidate these liabilities constitute the discussion of the curse of computerizations. Since both the potentials and liabilities of computers go forward hand-in-hand, the argument is made that computers can be a blessing to the degree that the liabilities are liquidated. Some practical suggestions as to liquidating the critical liabilities are offered from the point of view of industry to assist in attaining the potential of computers and data systems in support of the Navy's missions, roles, and objectives.
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