Implosion and core heating requirements in subignition experiments FIREX-I
Johzaki, Tomoyuki; Nakao, Yasuyuki; Mima, Kunioki
2008-06-01
In the fast ignition realization experiment project phase-I (FIREX-I) [H. Azechi and the FIREX Project, Plasma Phys. Control. Fusion 48, B267 (2006)], core heating up to an ion temperature of 5keV is expected for subignition-class carbon-deuterium (CD) and deuterium-tritium (DT) fuels. The dependence of the achieved ion temperature on heating pulse parameters, and core density is investigated using two-dimensional simulations. Since the core size in FIREX-I is insufficient for self-ignition, and the confinement time is comparable to the heating duration (˜10ps), the temperature relaxation between the bulk electrons and ions is important for efficient ion heating. High compression (a core density of ρ >200g/cm3) is required for pure DT fuel to shorten the relaxation time. In this case, a heating energy of Eh>2kJ and a duration of τh2kJ and τh˜10ps.
Simulation study of core heating properties for recent FIREX-I experiments
Johzaki, Tomoyuki; Kai, Yusuke; Endo, Takuma; Nagatomo, Hideo; Sunahara, Atsushi; Sentoku, Yasuhiko; Taguchi, Toshihiro; Fujioka, Shinsuke; Shiraga, Hiroyuki; Azechi, Hiroshi; Firex Project Team
2016-10-01
The demonstration of efficient core heating is the main purpose of FIREX-I project, where Au cone-attached solid ball CD target is used. For the guiding of fast electron beam generated by relativistic laser plasma interactions, the kilo-Tesla-class longitudinal magnetic field is applied by a capacitor-coil target and kJ-class ns-durration high power laser. In addition, to reduce the collisional effect (energy loss and scattering of fast electrons) during propagation in the Au cone tip, we introduced opened-tip cone (tipless cone). To evaluate the core heating properties, we carried out the integrated simulations, which shows the enhancement of core heating efficiency due to the magnetic guiding and opened-tip cone by a factor of three. These simulation results will be shown and be compared with the experimental results. JSPS KAKENHI (26400532, 15H03758, 16H02245, 15K21767), NIFS Collaboration Research program (NIFS12KUGK05, NIFS14KNSS054), and FIREX project.
Preliminary results on the cryogenic target for FIREX project
Iwamoto, A.; Maekawa, R.; Mito, T.; Okamoto, M.; Motojima, O.; Nakai, M.; Norimatsu, T.; Nagai, K.
2006-06-01
Preliminary tests on the cryogenic target for the fast ignition realization experiment (FIREX) project has been conducted. A foam shell method is proposed to realize its target design. A foam target consists of three parts: a foam shell, a conical laser guide and a liquid or gas feeder made of glass. The shell is a hollow sphere (500 μm in diameter) with a uniform and thin foam layer (˜ 20 μm in thickness). Epoxy resin is utilized to assemble the parts into the target. Regarding target fabrication, one of the concerns is the influence on various thermal contractions from the different materials when it is cooled down to cryogenic environment. This paper describes the result on the validity check at cryogenic environment and the demonstration of H{2} liquefaction using a dummy target instead of the foam target.
The status of Fast Ignition Realization Experiment (FIREX) and prospects for inertial fusion energy
Azechi, H.; FIREX Project Team
2016-05-01
Here we report recent progress for the fast ignition inertial confinement fusion demonstration. The fraction of low energy (heats the fuel core, increases by a factor of 4 by enhancing pulse contrast of heating laser and removing preformed plasma sources. Kilo-tesla magnetic field is studied to guide the diverging REB to the fuel core. The transport simulation of the REB accelerated by the heating laser in the externally applied and compressed magnetic field indicates that the REB can be guided efficiently to the fuel core. The integrated simulation shows > 4% of the heating efficiency and > 4 keV of ion temperature are achievable by using GEKKO-XII and LFEX, properly designed cone-fuel and an external magnetic field.
Laser machining for fabrication of targets used in the FIREX-I project
Fujimura, T; Nakai, M; Hayashi, N; Tanabe, M; Izawa, Y U; Homma, H; Nishimura, H; Norimatsu, T; Azechi, H [Institute of Laser Engineering (ILE), Osaka University, Osaka 565-0871 (Japan); Iwamoto, A; Nagai, K, E-mail: t-fujimura@ile.osaka-u.ac.j [National Institute for Fusion Science (NIFS), Toki, Gifu 509-5292 (Japan)
2010-08-01
This paper reports on way to fabricate a gas-tight targets dedicated for the first stage of Fast Ignition Realization Experiment (FIREX-I) at the Institute of Laser Engineering (ILE), Osaka University. It was found that a Ti;sapphire laser machining can be used to fabricate the target. The performance of the laser machining using a fs Ti;sapphire laser was examined on shell materials. The conditions for accurate machining were determined. Michelson interferometer with two different wavelengths which imitates a white light interferometer is an excellent tool for confirming the gas-tightness of the target after assembly.
FIREX mission requirements document for renewable resources
Carsey, F.; Dixon, T.
1982-01-01
The initial experimental program and mission requirements for a satellite synthetic aperture radar (SAR) system FIREX (Free-Flying Imaging Radar Experiment) for renewable resources is described. The spacecraft SAR is a C-band and L-band VV polarized system operating at two angles of incidence which is designated as a research instrument for crop identification, crop canopy condition assessments, soil moisture condition estimation, forestry type and condition assessments, snow water equivalent and snow wetness assessments, wetland and coastal land type identification and mapping, flood extent mapping, and assessment of drainage characteristics of watersheds for water resources applications. Specific mission design issues such as the preferred incidence angles for vegetation canopy measurements and the utility of a dual frequency (L and C-band) or dual polarization system as compared to the baseline system are addressed.
On the Realization of Popper's Experiment
Qureshi, T
2005-01-01
An experiment proposed by Karl Popper to test the standard interpretation of quantum mechanics was realized by Kim and Shih. We use a quantum mechanical calculation to analyze Popper's proposal, and find a surprising result for the location of the virtual slit. We also analyze Kim and Shih's experiment, and demonstrate that although it ingeneously overcomes the problem of temporal spreading of the wave-packet, it is inconclusive about Popper's test. We point out that another experiment which implements Popper's test in a conlcusive way, has actually been carried out. Its results are in contradiction with Popper's prediction, and agree with our analysis.
Analysis of Popper's Experiment and Its Realization
Qureshi, T.
2012-04-01
An experiment proposed by Karl Popper to test the standard interpretation of quantum mechanics was realized by Kim and Shih. We use a quantum mechanical calculation to analyze Popper's proposal, and find a surprising result for the location of the virtual slit. We also analyze Kim and Shih's experiment, and demonstrate that although it ingeniously overcomes the problem of temporal spreading of the wave-packet, it is inconclusive about Popper's test. We point out that another experiment which (unknowingly) implements Popper's test in a conclusive way, has actually been carried out. Its results are in contradiction with Popper's prediction, and agree with our analysis.
Recent progress of fuel layering study for FIREX cryogenic target
Iwamoto A.
2013-11-01
Full Text Available The collaboration research of ILE and NIFS has made progress on the FIREX target developments. We have two fuel layering strategies: a foam shell method and a conical laser guide heating technique. To date, preliminary and principle demonstration stages on both fuel layering methods have been reached. This paper describes the present status of the target developments.
Realism in the Realized Popper's Experiment
Hunter, G
2005-01-01
The realization of Karl Popper's EPR-like experiment by Shih and Kim (published 1999) produced the result that Popper hoped for: no ``action at a distance'' on one photon of an entangled pair when a measurement is made on the other photon. This experimental result is interpretable in local realistic terms: each photon has a definite position and transverse momentum most of the time; the position measurement on one photon (localization within a slit) disturbs the transverse momentum of that photon in a non-predictable way in accordance with the uncertainty principle; however, there is no effect on the other photon (the photon that is not in a slit) no action at a distance. The position measurement (localization within a slit) of the one photon destroys the entanglement between the photons; i.e. decoherence occurs.
Realism in the Realized Popper's Experiment
Hunter, Geoffrey
2002-12-01
The realization of Karl Popper's EPR-like experiment by Shih and Kim (published 1999) produced the result that Popper hoped for: no ``action at a distance'' on one photon of an entangled pair when a measurement is made on the other photon. This experimental result is interpretable in local realistic terms: each photon has a definite position and transverse momentum most of the time; the position measurement on one photon (localization within a slit) disturbs the transverse momentum of that photon in a non-predictable way in accordance with the uncertainty principle; however, there is no effect on the other photon (the photon that is not in a slit) no action at a distance. The position measurement (localization within a slit) of the one photon destroys the coherence (entanglement) between the photons; i.e. decoherence occurs. This realistic (albeit retrodictive) interpretation of the Shih-Kim realization of what Popper called his ``crucial experiment'' is in accord with Bohr's original concept of the nature of the uncertainty principle, as being an inevitable effect of the disturbance of the measured system by the measuring apparatus. In this experiment the impact parameter of an incident photon with the centerline of the slit is an uncontrollable parameter of each individual photon scattering event; this impact parameter is variable for every incident photon, the variations being a statistical aspect of the beam of photons produced by the experimental arrangement. These experimental results are also in accord with the proposition of Einstein, Podolski and Rosen's 1935 paper: that quantum mechanics provides only a statistical, physically incomplete, theory of microscopic physical processes, for the quantum mechanical description of the experiment does not describe or explain the individual photon scattering events that are actually observed; the angle by which an individual photon is scattered is not predictable, because the photon's impact parameter with the
Realism in the Realized Popper's Experiment
Hunter, G
2005-01-01
The realization of Karl Popper's experiment by Shih and Kim (published 1999) produced the result that Popper hoped for: no ``action at a distance'' on one photon of an entangled pair when a measurement is made on the other photon. This experimental result is interpretable in local realistic terms: each photon has a definite position and transverse momentum most of the time; the position measurement on one photon (localization in a slit) disturbs the transverse momentum of that photon in a non-predictable way in accordance with the uncertainty principle; however, there is no effect on the other photon (the photon that is not in a slit) no action at a distance. The position measurement (localization within a slit) of the one photon destroys the coherence (entanglement) between the photons; i.e. decoherence occurs. This can be understood physically as an electromagnetic interaction between the photon in the slit and the electrons of the atoms in the surface of the solid that forms the slit.
Experimental realization of Wheeler's delayed-choice gedanken experiment.
Jacques, Vincent; Wu, E; Grosshans, Frédéric; Treussart, François; Grangier, Philippe; Aspect, Alain; Roch, Jean-François
2007-02-16
Wave-particle duality is strikingly illustrated by Wheeler's delayed-choice gedanken experiment, where the configuration of a two-path interferometer is chosen after a single-photon pulse has entered it: Either the interferometer is closed (that is, the two paths are recombined) and the interference is observed, or the interferometer remains open and the path followed by the photon is measured. We report an almost ideal realization of that gedanken experiment with single photons allowing unambiguous which-way measurements. The choice between open and closed configurations, made by a quantum random number generator, is relativistically separated from the entry of the photon into the interferometer.
Experimental Realization of Popper's Experiment: Violation of Uncertainty Principle?
Kim, Yoon-Ho; Yu, Rong; Shih, Yanhua
An entangled pair of photon 1 and 2 are emitted in opposite directions along the positive and negative x-axis. A narrow slit is placed in the path of photon 1 which provides precise knowledge about its position along the y-axis and because of the quantum entanglement this in turn provides precise knowledge of the position y of its twin, photon 2. Does photon 2 experience a greater uncertainty in its momentum, i.e., a greater Δpy, due to the precise knowledge of its position y? This is the historical thought experiment of Sir Karl Popper which was aimed to undermine the Copenhagen interpretation in favor of a realistic viewpoint of quantum mechanics. Thispaper reports an experimental realization of the Popper's experiment. One may not agree with Popper's position on quantum mechanics; however, it calls for a correct understanding and interpretation of the experimental results.
Delayed-choice gedanken experiments and their realizations
Ma, Xiao-song; Kofler, Johannes; Zeilinger, Anton
2016-01-01
The wave-particle duality dates back to Einstein's explanation of the photoelectric effect through quanta of light and de Broglie's hypothesis of matter waves. Quantum mechanics uses an abstract description for the behavior of physical systems such as photons, electrons, or atoms. Whether quantum predictions for single systems in an interferometric experiment allow an intuitive understanding in terms of the particle or wave picture depends on the specific configuration which is being used. In principle, this leaves open the possibility that quantum systems always behave either definitely as a particle or definitely as a wave in every experimental run by a priori adapting to the specific experimental situation. This is precisely what is tried to be excluded by delayed-choice experiments, in which the observer chooses to reveal the particle or wave character of a quantum system—or even a continuous transformation between the two—at a late stage of the experiment. The history of delayed-choice gedanken experiments, which can be traced back to the early days of quantum mechanics, is reviewed. Their experimental realizations, in particular, Wheeler's delayed choice in interferometric setups as well as delayed-choice quantum erasure and entanglement swapping are discussed. The latter is particularly interesting, because it elevates the wave-particle duality of a single quantum system to an entanglement-separability duality of multiple systems.
Experimental realization of Wheeler's delayed-choice GedankenExperiment
Jacques, V; Grosshans, F; Grangier, P; Aspect, A; Jacques, Vincent; Grosshans, Fr\\'{e}d\\'{e}ric; Grangier, Philippe; Aspect, Alain
2006-01-01
The quantum "mystery which cannot go away" (in Feynman's words) of wave-particle duality is illustrated in a striking way by Wheeler's delayed-choice GedankenExperiment. In this experiment, the configuration of a two-path interferometer is chosen after a single-photon pulse has entered it : either the interferometer is \\textit{closed} (\\textit{i.e.} the two paths are recombined) and the interference is observed, or the interferometer remains \\textit{open} and the path followed by the photon is measured. We report an almost ideal realization of that GedankenExperiment, where the light pulses are true single photons, allowing unambiguous which-way measurements, and the interferometer, which has two spatially separated paths, produces high visibility interference. The choice between measuring either the 'open' or 'closed' configuration is made by a quantum random number generator, and is space-like separated -- in the relativistic sense -- from the entering of the photon into the interferometer. Measurements in ...
Fujioka, Shinsuke
2015-11-01
We report on progresses of the Fast Ignition Realization Experiment (FIREX) project that has been curried out at the Institute of Laser Engineering to assess the feasibility of high density core heating with a high-power, short-pulse laser including the construction of the Kilo-Joule, Petawatt class LFEX laser system. Our recent studies identify three scientific challenges to achieve high heating efficiency in the fast ignition (FI) scheme with the current GEKKO and LFEX laser systems: (i) control of energy distribution of relativistic electron beam (REB), (ii) guiding and focusing of REB to a fuel core, and (iii) formation of a high areal-density core. The control of the electron energy distribution has been experimentally confirmed by improving the intensity contrast of the LFEX laser up to >109 and an ultra-high contrast of 1011 with a plasma mirror. After the contrast improvement, 50% of the total REB energy is carried by a low energy component of the REB, which slope temperature is close to the ponderomotive scaling value (~ 1 MeV). To guide the electron beam, we apply strong external magnetic field to the REB transport region. Guiding of the REB by 0.6 kT field in a planar geometry has already been demonstrated at LULI 2000 laser facility in a collaborative experiment lead by CELIA-Univ. Bordeaux. Considering more realistic FI scenario, we have performed a similar experiment using the Kilo-Joule LFEX laser to study the effect of guiding and magnetic mirror on the electron beam. A high density core of a laser-imploded 200 μm-diameter solid CD ball was radiographed with picosecond LFEX-produced K-alpha backlighter. Comparisons of the experimental results and integrated simulations using hydrodynamic and electron transport codes suggest that 10% of the efficiency can be achievable with the current GEKKO and LFEX laser system with the success of the above challenges. This work is supported by NIFS (Japan), MEXT/JSPS KAKENHI (Japan), JSPS Fellowship (Japan), ANR
The transversal flow microfiltration module: theory, design, realization and experiments
Knops, F.N.M.; Futselaar, H.; Rácz, I.G.
1992-01-01
This study shows that the permeate flux in microfiltration can be inscreased without increasing energy consumption, by using the hollow fiber membranes themselves as turbulence promoters. This is realized by using shell-side fed hollow fibers, which are placed perpendicular to the feed stream. This
Experience of Macroeconomic Models Realization in Transition Economy
Elvira Naval
2005-01-01
Full Text Available This article represents an issue about macroeconomic model realization under transition economy of Moldova Republic. Different macroeconomic model beginning with simple monetary model and growth model, and more complicated model as financial programming models, general equilibrium model, describing complex functioning of national economy and forecasting effect of various economic policies on economy development were considered. Some comparative analysis and conclusions were presented.
Fujioka, Shinsuke; Arikawa, Yasunobu; Kojima, Sadaoki; Johzaki, Tomoyuki; Nagatomo, Hideo; Sawada, Hiroshi; Lee, Seung Ho; Shiroto, Takashi; Ohnishi, Naofumi; Morace, Alessio; Vaisseau, Xavier; Sakata, Shohei; Abe, Yuki; Matsuo, Kazuki; Farley Law, King Fai; Tosaki, Shota; Yogo, Akifumi; Shigemori, Keisuke; Hironaka, Yoichiro; Zhang, Zhe; Sunahara, Atsushi; Ozaki, Tetsuo; Sakagami, Hitoshi; Mima, Kunioki; Fujimoto, Yasushi; Yamanoi, Kohei; Norimatsu, Takayoshi; Tokita, Shigeki; Nakata, Yoshiki; Kawanaka, Junji; Jitsuno, Takahisa; Miyanaga, Noriaki; Nakai, Mitsuo; Nishimura, Hiroaki; Shiraga, Hiroyuki; Kondo, Kotaro; Bailly-Grandvaux, Mathieu; Bellei, Claudio; Santos, João Jorge; Azechi, Hiroshi
2016-05-01
A petawatt laser for fast ignition experiments (LFEX) laser system [N. Miyanaga et al., J. Phys. IV France 133, 81 (2006)], which is currently capable of delivering 2 kJ in a 1.5 ps pulse using 4 laser beams, has been constructed beside the GEKKO-XII laser facility for demonstrating efficient fast heating of a dense plasma up to the ignition temperature under the auspices of the Fast Ignition Realization EXperiment (FIREX) project [H. Azechi et al., Nucl. Fusion 49, 104024 (2009)]. In the FIREX experiment, a cone is attached to a spherical target containing a fuel to prevent a corona plasma from entering the path of the intense heating LFEX laser beams. The LFEX laser beams are focused at the tip of the cone to generate a relativistic electron beam (REB), which heats a dense fuel core generated by compression of a spherical deuterized plastic target induced by the GEKKO-XII laser beams. Recent studies indicate that the current heating efficiency is only 0.4%, and three requirements to achieve higher efficiency of the fast ignition (FI) scheme with the current GEKKO and LFEX systems have been identified: (i) reduction of the high energy tail of the REB; (ii) formation of a fuel core with high areal density using a limited number (twelve) of GEKKO-XII laser beams as well as a limited energy (4 kJ of 0.53-μm light in a 1.3 ns pulse); (iii) guiding and focusing of the REB to the fuel core. Laser-plasma interactions in a long-scale plasma generate electrons that are too energetic to efficiently heat the fuel core. Three actions were taken to meet the first requirement. First, the intensity contrast of the foot pulses to the main pulses of the LFEX was improved to >109. Second, a 5.5-mm-long cone was introduced to reduce pre-heating of the inner cone wall caused by illumination of the unconverted 1.053-μm light of implosion beam (GEKKO-XII). Third, the outside of the cone wall was coated with a 40-μm plastic layer to protect it from the pressure caused by imploding
Cool-down performance of the new apparatus for fuel layering demonstrations of FIREX targets
Iwamoto, A.; Norimatsu, T.; Nakai, M.; Sakagami, H.; Shiraga, H.; Azechi, H.
2016-03-01
FIREX targets have been developed under two layering strategies: foam shell and cone guide laser heating methods. Basic studies have been conducted by the collaboration research between ILE and NIFS. Then the next stage requires the characterization of a layered solid fuel. The present system is at the disadvantage of optical observations. Therefore, a new apparatus is designed to solve it. Glass windows with a wide aperture are installed for an interferometer and a microscope. To isolate the vibration from a cryocooler, active vibration control units are equipped, and flexible thermal conductive links are utilized. Furthermore, a quick target exchange mechanism is applied to deal with different types of FIREX targets. A target holder is detachable from a main vacuum chamber. A metal gasket with not fixing bolts but a load of ∼ thousand newtons on ensures GHe leak tightness for target cooling. Eventually, the design temperature of 10.00 K at a target container has been achieved. The cool-down performance indecates that the new apparatus provides a cryogenic environment for fuel layering demonstrations.
Experimental realization of Popper's Experiment Violation of the Uncertainty Principle?
Kim, Y H; Kim, Yoon-Ho; Shih, Yanhua
1999-01-01
An entangled pair of photons (1 and 2) are emitted to opposite directions. A narrow slit is placed in the path of photon 1 to provide precise knowledge of its position on the $y$ axis and this also determines the precise $y$ position of its twin, photon 2, due to quantum entanglement. Is photon 2 going to experience a greater uncertainty in momentum, i.e., a greater $\\Delta p_{y}$, due to the precise knowledge of its position $y$? The experimental data shows historical thought experiment of Karl Popper signal a violation of the uncertainty principle?
Comment on "Experimental realization of Popper's experiment Violation of the uncertainty principle?"
Short, A J
2000-01-01
Application of the uncertainty principle to conditional measurements is investigated, and found to be valid for measurements on separated sub-systems. In light of this, an apparent violation of the uncertainty principle obtained by Kim and Shih in their realization of Popper's experiment (quant-ph/9905039) is explained through analogy with a simple optical system.
The LYRA-B space experiment: Goals and principles for its realization
Zakharov, A. I.; Mironov, A. V.; Prokhorov, M. E.; Biryukov, A. V.; Stekol'shchikov, O. Yu.; Tuchin, M. S.
2013-03-01
We describe goals and principles for the realization the Lyra-B space experiment onboard the International Space Station, which is currently being prepared at the Sternberg Astronomical Institute. The main goal of the experiment is to carry out a high-accuracy, multicolor all-sky survey of stars down to 16 m -17 m . The detailed structure of the expected observational data, their possible scientific use, and a number of technical problems are discussed.
Simulation, realization and test of veto systems for the NA62 experiment
Palladino, Vito
Search Simple Search Advanced Search Latest Additions Browse Browse by Author Browse by Subject Browse by Year Browse by Type Browse by Full text availability Info Policy About FAQ Contact us Palladino, Vito (2010) Simulation, realization and test of veto systems for the NA62 experiment. [Tesi di dottorato] (Unpublished) [img] PDF palladino_vito_23.pdf Download (55MB) | Preview Item Type: Tesi di dottorato Language: English Title: Simulation, realization and test of veto systems for the NA62 experiment Creators: Creators\tEmail Palladino, Vito\tvitopalladino@gmail.com Date: 30 November 2010 Number of Pages: 146 Institution: Università degli Studi di Napoli Federico II Department: Scienze fisiche Doctoral School: Scienze fisiche PHD name: Fisica fondamentale ed applicata PHD cycle: 23 PHD Coordinator: name\temail Marrucci, Lorenzo\tUNSPECIFIED Tutor: name\temail Ambrosino, Fabio\tUNSPECIFIED Date: 30 November 2010 Number of Pages: 146 Uncontrolled Keywords: Kaon NA62 Veto CHANTI LAV MIUR S.S.D...
The Realization Path of Japan’s Agricultural Modernization and Its Precious Experience for China
ZHANG Xiu-guang; XIE Ping
2012-01-01
In Japan, the per capita arable land area is small, the natural resources are short, and agricultural production has the typical characteristics of the peasant economy. Even if there are many unfavorable conditions, the level of agricultural modernization of Japan has exceeded that of many developed countries. We conduct comparative analysis on the development characteristics of China’s agriculture and Japan’s agriculture, and summarize the realization path of Japan’s agricultural modernization. Based on the reality of China, we can draw on the following experience from Japan: establishing and improving the agricultural legislation for agriculture; improving the rural cooperative economic organizations; deepening the reform of the agricultural land property right system; increasing the government’s direct funds input of into agriculture; improving the agricultural technology extension system.
Realization of All-or-nothing-type Kochen-Specker Experiment with Single Photons
Huang, Y F; Zhang, Y S; Pan, J W; Guo, G C; Huang, Yun-Feng; Li, Chuan-Feng; Zhang, Yong-Sheng; Pan, Jian-Wei; Guo, Guang-Can
2002-01-01
Using the spontaneous parametric down-conversion process in a type-I phase matching BBO crystal as single photon source, we perform an all-or-nothing-type Kochen-Specker experiment proposed by Simon \\QTR{it}{et al}. [Phys. Rev. Lett. \\QTR{bf}{85}, 1783 (2000)] to verify whether noncontextual hidden variables or quantum mechanics is right. The results strongly agree with quantum mechanics.
Chen, Qi; Zhang, Dechen; Zhu, Dandi; Shi, Qianyun; Gu, Jian; Ai, Yong
2015-10-01
Currently various types of aircraft booming and maturing, however, their long-time navigational capability should be improved urgently. This paper aims at studying laser power beaming, which includes the technology of high-efficient photoelectric conversion and APT(acquiring, pointing and tracking) technology, to provide power for flying UAV(unmanned aerial vehicles) and improve their flight endurance. The experiment of testing different types of solar cells under various conditions has been done to choose the solar cell which has the highest photoelectric conversion rate and find its most sensitive wavelength. In addition, the charge management module has been chose on the base of the characteristics of lithium batteries. Besides, a laser APT system was designed and set up, at the same time FSM (Fast Scan Mirror) control program and digital image processing program were used to control the system. The success of the indoor experiment of scan-tracking and charging for the moving UAV model via laser proves that this system is workable. And in this experiment, the photoelectric conversion rate of the whole system is up to 17.55%.
Design, realization and test of a digital chip for ALICE ITS experiment
Antinori, S; Gabrielli, A; Gandolfi, E
2004-01-01
CARLOS v3 (Compression And Run Length encOding subSystem) is the name of the third version of a digital radiation hardened chip that plays a significant role in the data acquisition chain of the ALICE experiment (A Large Ion Collider Experiment) for what concerns the Inner Tracking System (ITS). In particular CARLOS has the purpose of performing an on-line compression on data coming from two half detectors SDDs (Silicon Drift Detectors). In fact data volume of SDD events and trigger rate require the use of an on-line compression device with high performances for what concerns compression coefficient and total throughput. The chip has been tested using a specific PCB (Printed Circuit Board) containing the connectors for probing the ASIC with a pattern generator and a logic state analyzer. The chips have been inserted on the PCB using a ZIF socket, that allowed us to test the 35 packaged samples out of the total amount of bare chips received from the foundry. The test phase has shown that 32 out of 35 chips und...
Realization of hydrodynamic experiments on quasi-2D liquid crystal films in microgravity
Clark, Noel A.; Eremin, Alexey; Glaser, Matthew A.; Hall, Nancy; Harth, Kirsten; Klopp, Christoph; Maclennan, Joseph E.; Park, Cheol S.; Stannarius, Ralf; Tin, Padetha; Thurmes, William N.; Trittel, Torsten
2017-08-01
Freely suspended films of smectic liquid crystals are unique examples of quasi two-dimensional fluids. Mechanically stable and with quantized thickness of the order of only a few molecular layers, smectic films are ideal systems for studying fundamental fluid physics, such as collective molecular ordering, defect and fluctuation phenomena, hydrodynamics, and nonequilibrium behavior in two dimensions (2D), including serving as models of complex biological membranes. Smectic films can be drawn across openings in planar supports resulting in thin, meniscus-bounded membranes, and can also be prepared as bubbles, either supported on an inflation tube or floating freely. The quantized layering renders smectic films uniquely useful in 2D fluid physics. The OASIS team has pursued a variety of ground-based and microgravity applications of thin liquid crystal films to fluid structure and hydrodynamic problems in 2D and quasi-2D systems. Parabolic flights and sounding rocket experiments were carried out in order to explore the shape evolution of free floating smectic bubbles, and to probe Marangoni effects in flat films. The dynamics of emulsions of smectic islands (thicker regions on thin background films) and of microdroplet inclusions in spherical films, as well as thermocapillary effects, were studied over extended periods within the OASIS (Observation and Analysis of Smectic Islands in Space) project on the International Space Station. We summarize the technical details of the OASIS hardware and give preliminary examples of key observations.
McNeil, Deborah A; Vekved, Monica; Dolan, Siobhan M; Siever, Jodi; Horn, Sarah; Tough, Suzanne C
2012-03-21
Pregnant women in Canada have traditionally received prenatal care individually from their physicians, with some women attending prenatal education classes. Group prenatal care is a departure from these practices providing a forum for women to experience medical care and child birth education simultaneously and in a group setting. Although other qualitative studies have described the experience of group prenatal care, this is the first which sought to understand the central meaning or core of the experience. The purpose of this study was to understand the central meaning of the experience of group prenatal care for women who participated in CenteringPregnancy through a maternity clinic in Calgary, Canada. The study used a phenomenological approach. Twelve women participated postpartum in a one-on-one interview and/or a group validation session between June 2009 and July 2010. Six themes emerged: (1) "getting more in one place at one time"; (2) "feeling supported"; (3) "learning and gaining meaningful information"; (4) "not feeling alone in the experience"; (5) "connecting"; and (6) "actively participating and taking on ownership of care". These themes contributed to the core phenomenon of women "getting more than they realized they needed". The active sharing among those in the group allowed women to have both their known and subconscious needs met. Women's experience of group prenatal care reflected strong elements of social support in that women had different types of needs met and felt supported. The findings also broadened the understanding of some aspects of social support beyond current theories. In a contemporary North American society, the results of this study indicate that women gain from group prenatal care in terms of empowerment, efficiency, social support and education in ways not routinely available through individual care. This model of care could play a key role in addressing women's needs and improving health outcomes.
McNeil Deborah A
2012-03-01
Full Text Available Abstract Background Pregnant women in Canada have traditionally received prenatal care individually from their physicians, with some women attending prenatal education classes. Group prenatal care is a departure from these practices providing a forum for women to experience medical care and child birth education simultaneously and in a group setting. Although other qualitative studies have described the experience of group prenatal care, this is the first which sought to understand the central meaning or core of the experience. The purpose of this study was to understand the central meaning of the experience of group prenatal care for women who participated in CenteringPregnancy through a maternity clinic in Calgary, Canada. Methods The study used a phenomenological approach. Twelve women participated postpartum in a one-on-one interview and/or a group validation session between June 2009 and July 2010. Results Six themes emerged: (1 "getting more in one place at one time"; (2 "feeling supported"; (3 "learning and gaining meaningful information"; (4 "not feeling alone in the experience"; (5 "connecting"; and (6 "actively participating and taking on ownership of care". These themes contributed to the core phenomenon of women "getting more than they realized they needed". The active sharing among those in the group allowed women to have both their known and subconscious needs met. Conclusions Women's experience of group prenatal care reflected strong elements of social support in that women had different types of needs met and felt supported. The findings also broadened the understanding of some aspects of social support beyond current theories. In a contemporary North American society, the results of this study indicate that women gain from group prenatal care in terms of empowerment, efficiency, social support and education in ways not routinely available through individual care. This model of care could play a key role in addressing women
Carsey, F.
1982-01-01
A future bilateral SAR program was studied. The requirements supporting a SAR mission posed by science and operations in sea-ice-covered waters, oceanography, renewable resources, and nonrenewable resources are addressed. The instrument, mission, and program parameters were discussed. Research investigations supporting a SAR flight and the subsequent overall mission requirements and tradeoffs are summarized.
Beyreuther, Elke
2010-09-10
of damage for decreasing photon energy. For this reason, the assumed photon energy dependence was reconfirmed for a cell line other than human lymphocytes, an important finding that was discussed on the 2007 Retreat of the German Commission on Radiological Protection. After successful finalization of the photon experiments the focus of the present dissertation was directed to the realization of in vitro cell irradiation experiments with laser-accelerated electrons. This research was carried out in the frame of the project onCOOPtics that aims on the development of laser-based particle accelerators, which promise accelerators of potentially compact size and more cost-effectiveness suitable for a widespread medical application, especially for high precision hadron therapy. The unique properties, i.e., the ultrashort bunch length and resultant ultrahigh pulse dose rate, of these unconventional particle accelerators demand for extensive investigations with respect to potential effects on the dosimetric and radiobiological characterization. Based on the experiences gained at ELBE first experiments on the radiobiological characterization of laser-accelerated electrons have been performed at the Jena Titanium:Sapphire laser system. After beam optimization, a sophisticated dosimetry system was established that allow for the online control of the beam parameters and for the controlled delivery of dose to the cell sample. Finally, worldwide first systematic in vitro cell irradiation experiments were carried out resulting in a reduced biological effectiveness for laser-accelerated electrons relative to the 200 kV X-ray reference, irrespectively on the biological effect and cell lines examined. These successful results are the basis for future in vivo studies and experiments with laser-accelerated protons.
New way to realizing the mathematics experiment teaching%探讨数学实验教学的新途径
阿合买提江·依明江; 热合买提江·依明江
2012-01-01
In this article, visual representation of derivative＇s geometric meaning with Excel demo by using ＂numeric＂, ＂figure＂ and ＂move＂ coherent for an example, provided a simple, intuitive, efficient means to realize mathematical experiment teaching.%以导数的几何意义“数”“形”及“动”连贯直观表示，以Excel演示为例，实现数学实验教学平台，提供了一种简单、直观、高效的手段。
Rockers, Peter C; Tugwell, Peter; Røttingen, John-Arne; Bärnighausen, Till
2017-04-06
Although the number of quasi-experiments conducted by health researchers has increased in recent years, there clearly remains unrealized potential for using these methods for causal evaluation of health policies and programs globally. This article proposes five prescriptions for capturing the full value of quasi-experiments for health research. First, new funding opportunities targeting proposals that use quasi-experimental methods should be made available to a broad pool of health researchers. Second, administrative data from health programs, often amenable to quasi-experimental analysis, should be made more accessible to researchers. Third, training in quasi-experimental methods should be integrated into existing health science graduate programs to increase global capacity to use these methods. Fourth, clear guidelines for primary research and synthesis of evidence from quasi-experiments should be developed. Fifth, strategic investments should be made to continue to develop new innovations in quasi-experimental methodologies. Tremendous opportunities exist to expand the use of quasi-experimental methods to increase our understanding of which health programs and policies work and which do not. Health researchers should continue to expand their commitment to rigorous causal evaluation with quasi-experimental methods, and international institutions should increase their support for these efforts. Copyright © 2017 Elsevier Inc. All rights reserved.
渐开线齿轮啮合传动虚拟实验的实现%Realization of virtual experiment of involute gears meshing transmission
穆立茂; 郭朝勇; 张靖; 李志尊; 崔秀梅
2011-01-01
To solve the problem of lack of imagination in the actual involute gear tooth profile and the process of meshing transmission for beginners, the involute gears meshing transmission virtual experiment is designed and developed, and the involute gear tooth profile precision drawing in accordance with the processing of the practical situation is achieved, and the simulation of gears rotation and the gear meshing point moving is a-chieved. Finally the realization of functions realized by the virtual experiment is verified by an example.%针对学生对实际渐开线齿轮齿廓及啮合传动过程理解的困难,设计并开发了渐开线齿轮啮合传动虚拟实验,实现了与加工实际情况相符的渐开线齿轮齿廓的精确绘制,以及齿轮啮合传动过程中齿轮旋转和啮合点移动的仿真,最后通过实例验证了该虚拟实验所实现的功能.
Vasin, M V; Antipov, V V; Chernov, G A; Abramov, M M; Gavriliuk, D N; L'vova, T S; Suvorov, N N
1997-01-01
In the experiments on dogs, the role of a pharmacological circulatory hypoxia in the mechanism of radioprotective effect of indraline and mexamine was studied. Angiography revealed 20-40% vasoconstriction of major arteries of legs of animals, of pelvis and abdomen caused by mexamine (10 mg/kg) and the absence of a significant effect of indraline. Disruption of a regional blood circulation in the marrow and spleen (40-50% and 70-80%, respectively) was caused by indraline to the same extent as by mexamine. For indraline, a decrease in pO2 in the marrow was about 50%. With these hemodynamic disturbances, indraline showed 80 to 100% radioprotective effect, while mexamine was inefficient. Acute hypoxic hypoxia (5-7% O2) increased a post-radiation survival rate for dogs by 40%. The radioprotective effect of indraline was blocked by tropaphen and reduced in cases of breathing with pure oxygen. Splenectomy has no effect on radioprotective properties of indraline. Thus, a hypothesis of the mechanism of a radioprotective effect of alpha-adrenomimetics was proposed.
Realizability: a historical essay
Oosten, J. van
2001-01-01
The purpose of this short paper is to sketch the development of a few basic topics in the history of Realizability The number of topics is quite limited and reects very much my own personal taste biases and prejudices Realizability has over the past years developed into a subject of such dimensions
Successful product realization strategies
Peeples, John; Boulton, William R.
1995-02-01
Product realization is the process of defining, designing, developing, and delivering products to the market. While the main thrust of this JTEC panel was to conduct a complete investigation of the state of Japanese low-cost electronic packaging technologies, it is very difficult to totally separate the development of technology and products from the product realization process. Japan's electronics firms adhere to a product realization strategy based on a strong customer focus, a consistent commitment to excellence in design, and a cost-effective approach to technology commercialization. The Japanese product-pull strategy has been a successful driver and influencing factor in every aspect of the product development cycle.
Department of Veterans Affairs — This dataset is provided as a requirement of OMB’s Integrated Data Collection (IDC) and links to VA’s Realized Cost Savings and Avoidances data in JSON format. Cost...
国产粗纱机实现精密定长的体会%Experience of Domestic Roving Machine Realizing Precision Fixed-length
王文国; 杨振涛
2011-01-01
为了实现国产粗纱机的精密定长,分析了无精密定长国产粗纱机落纱长度不一致产生的原因,并针对性的采取其实现精密定长落纱的措施.认为,粗纱张力、假捻器、锭翼清洁、温湿度等是影响粗纱定长的主要因素;三种粗纱长度之间的差异可通过技术改进和管理措施来改善.生产实践证明:通过相关措施的实施,粗妙落纱长度与工艺设定长度差可控制在±1m,可有效地改善重量不匀率及降低回花率.%To realize domestic roving machine precision fixed-length, reasons of domestic roving machine without precision fixed-length doffer length disaccord were analyzed, measures of realizing precision fixed-length doffer were adopted accordingly. It is considered that main factors of effecting roving fixed length should be roving tension, false-twister, flyer cleaning, temperature & humidity et al. Differences among three roving lengths can be improved technology modification and management. Practice proves that through implementing related measures, difference between roving doffer length and processing setting length can be controlled in ± 1 m, weight unevenness and cotton waste percentage can be improved effectively.
Akhmetova, Daniya; Vorontsova, Liliya; Morozova, Ilona Gennadyevna
2013-01-01
The article is devoted to the unique experience of distance learning development in the conditions of Russian reality. The model of distance learning in the Institute of Economics, Management and Law (Kazan city, Russia) is created on the basis of educational sphere diagnosis taking into account foreign and Russian experience. The specificity of…
Realizing Corporate Responsibility
Girschik, Verena
This doctoral dissertation aims to understand how companies realize corporate responsibility - both how they perform corporate responsibility in particular local contexts and how they negotiate understandings of what corporate responsibility means. It builds on an inductive case study of the Danish...... in this dissertation unfold distinct yet interdependent processes of positioning and framing that constitute new ways of performing and understanding corporate responsibility....
Daniya Akhmetova,
2013-07-01
Full Text Available The article is devoted to the unique experience of distance learning development in the conditions of Russian reality. The model of distance learning in the Institute of Economics, Management and Law (Kazan city, Russia is created on the basis of educational sphere diagnosis taking into account foreign and Russian experience. The specificity of the model is the permanent diagnosis of the components of the educational environment such as teacher qualifications, level of students’ actual knowledge, filling the educational process with information technologies, availability and quality of electronic resources, the correct choice of learning technologies, and policy in the field of the computerization of the professional education process.
Dreams, Perception, and Creative Realization.
Glaskin, Katie
2015-10-01
This article draws on the ethnography of Aboriginal Australia to argue that perceptual openness, extending from waking life into dreaming experience, provides an important cognitive framework for the apprehension of dreamt experience in these contexts. I argue that this perceptual openness is analogous to the "openness to experience" described as a personality trait that had been linked with dream recall frequency (among other things). An implication of identifying perceptual openness at a cultural rather than at an individual level is two-fold. It provides an example of the ways in which cultural differences affect perception, indicative of cognitive diversity; and, given the relationship between dreams and creativity suggested anecdotally and through research, a cultural orientation toward perceptual openness is also likely to have implications for the realization of creativity that occurs through dreams. Such creativity though cannot be separated from the relational context in which such dreamt material is elaborated and understood.
Hansen, Peter Reinhard; Lunde, Asger; Voev, Valeri Radkov
2014-01-01
We introduce a multivariate generalized autoregressive conditional heteroskedasticity (GARCH) model that incorporates realized measures of variances and covariances. Realized measures extract information about the current levels of volatilities and correlations from high-frequency data, which...... is particularly useful for modeling financial returns during periods of rapid changes in the underlying covariance structure. When applied to market returns in conjunction with returns on an individual asset, the model yields a dynamic model specification of the conditional regression coefficient that is known...... as the beta. We apply the model to a large set of assets and find the conditional betas to be far more variable than usually found with rolling-window regressions based exclusively on daily returns. In the empirical part of the paper, we examine the cross-sectional as well as the time variation...
Mathebula, Sibusiso Donald; Ross, Eleanor
2013-01-01
Poverty and youth unemployment are critical issues in South Africa with homeless persons begging at traffic light intersections in all major cities. Support services represent one way of empowering homeless youth. The study therefore examined the experiences of 10 homeless young adult males in Hillbrow, Johannesburg and whether they were aware of local health and social services. Qualitative interviews revealed that participants experienced poor health, addiction, physical violence, psychological trauma, and public hostility. Despite limited education, they were aware of and utilized local health and social services. Findings are discussed in terms of their implications for social work.
Realizing Controllable Quantum States
Takayanagi, Hideaki; Nitta, Junsaku
-- 4. Mesoscopic superconductivity with unconventional superconductor or ferromagnet. Ultraefficient microrefrigerators realized with ferromagnet-superconductor junctions / F. Giazotto et al. Anomalous charge transport in triplet superconductor junctions by the synergy effect of the proximity effect and the mid gap Andreev resonant states / Y. Tanaka and S. Kashiwaya. Paramagnetic and glass states in superconductive YBa[symbol]Cu[symbol]O[symbol] ceramics of sub-micron scale grains / H. Deguchi et al. Quantum properties of single-domain triplet superconductors / A. M. Gulian and K. S. Wood. A numerical study of Josephson current in p wave superconducting junctions / Y. Asano et al. Tilted bi-crystal sapphire substrates improve properties of grain boundary YBa[symbol]Cu[symbol]O[symbol] junctions and extend their Josephson response to THZ frequencies / E. Stepantsov et al. Circuit theory analysis of AB-plane tunnel junctions of unconventional superconductor Bi[symbol]Sr[symbol]Ca[symbol]Cu[symbol]O[symbol] / I. Shigeta et al. Transport properties of normal metal/anisotropic superconductor junctions in the eutectic system Sr[symbol]RuO[symbol]Ru / M. Kawamura et al. Macroscopic quantum tunneling in d-wave superconductor Josephson / S. Kawabata et al. Quasiparticle states of high-T[symbol] oxides observed by a Zeeman magnetic field response / S. Kashiwaya et al. Experimentally realizable devices for controlling the motion of magnetic flux quanta in anisotropic superconductors: vortex lenses, vortex diodes and vortex pumps / S. Savel'ev and F. Nori. Stability of vortex-antivortex "molecules" in mesoscopic superconducting triangles / V. R. Misko et al. Superconducting network with magnetic decoration - Hofstadter butterfly in spatially modulated magnetic field / Y. Iye et al. Observation of paramagnetic supercurrent in mesoscopic superconducting rings and disks using multiple-small-tunnel-junction method / A. Kanda et al. Guidance of vortices in high
Chang, Jonghwa [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)
2015-10-15
High temperature gas cooled reactor has been developed since 1956. Fundamental idea of a gas cooled reactor is to achieve high temperature which is suitable for high efficiency application such as electricity generation. The core is composed of ceramics, graphite blocks which are mechanical stable up to very high temperature. Fuel is ceramics, TRISO ( tri-isotropic coated micro particle) whose dense coating layers work as small radioactivity containment. Coolant is inert gas, helium, which is stable chemically, neutronically, and thermal hydraulically. Several test reactors such as DRE, PB-1, FSV, AVR, THTR, HTTR, HTR-10 were built and demonstrated their safety. Large GA-HTR, RSA-PBMR projects are canceled and US-NGNP project is idling. Only Chinese HTR-PM demonstrator is under construction. HTGR has long history of development. For realization and market penetration, VHTR community should look at niche market such as carbon free energy supply to industry complex, electric power for small grid, carbon free hydrogen production, power source for space colony. Technology Readiness Level should be advanced to get proper investment from industry. For this, cooperation between international R and D institutions is required. Clearly divided role between universities, research institutions, and industries will reduce complication and shorten VHTR realization day.
Realization theory for rational systems
Ně mcová, J.; Schuppen, J.H. van
2008-01-01
In this paper we solve the problem of realization of response maps for rational systems. Sufficient and necessary conditions for a response map to be realizable by a rational system are presented. The properties of rational realizations such as observability, controllability, and minimality are stud
FEEDBACK REALIZATION OF HAMILTONIAN SYSTEMS
CHENGDaizhan; XIZairong
2002-01-01
This paper investigates the relationship between state feedback and Hamiltonican realization.Firest,it is proved that a completely controllable linear system always has a state feedback state equation Hamiltonian realization.Necessary and sufficient conditions are obtained for it to have a Hamiltonian realization with natural output.Then some conditions for an affine nonlinear system to have a Hamiltonian realization are given.some conditions for an affine nonlinear system to have a Hamiltonian realization are given.For generalized outputs,the conditions of the feedback,keeping Hamiltonian,are discussed.Finally,the admissible feedback controls for generalized Hamiltonian systems are considered.
konferencepaper: Realizing the Unreal
Raahauge, Kirsten Marie
use of the ghostly can prove fruitful when it reacts on the empirical field of haunting: on the concrete subject matter of ghost-experiences (or as concrete as ghosts can get). In other words: How can the analytical perspective of hauntology shed light on the empirical field of people experiencing...... haunted houses? Based on my ongoing anthropological fieldwork concerning haunted houses in Denmark today this abstract adresses the convergences of hauntology and haunted houses, focusing on spatial and material aspects. The concept of hauntology is part of the effort to understand the experience of ghost...
Realization of Wavelet Transform Using SAW Devices
无
2001-01-01
Based on the characteristics of surface acoustic wave(SAW) devices, the theory for realizing wavelet transform (WT) by SAW is deduced. Simulated experiment shows that the method of implementing WT using SAW devices has virtues of high speed and utility and is compatible with digital technique. It is important to implement wavelet transform.
NONE
2003-07-01
The European demonstration project Hip Hip (house integrated photovoltaic high-tech in public) led the French photovoltaic market to reach a level comparable to those of the other European countries in terms of relevance of implemented solutions and costs. This document presents the best realizations and the experience gained through the Hip Hip project. Its aim is to convince the designers and managers of building projects of the advantages of photovoltaic installations integrated to the structure and connected to the power distribution grid: 1 - presentation of the technology; 2 - status of the Hip Hip demonstration project (goals, results: main innovations and impact on the French market); 3 - different possibilities of integration to the building structure; 4 - examples of projects realized in France in the framework of the Hip Hip project: integration in glass roof, frontage, added elements, fitting on roofs. (J.S.)
Realization-Based System Identification with Applications
Miller, Daniel N.
The identification of dynamic system behavior from experimentally measured or computationally simulated data is fundamental to the fields of control system design, modal analysis, and defect detection. In this dissertation, methods for system identification are developed based on classical linear system realization theory. The common methods of state-space realization from a measured, discrete-time impulse response are generalized to the following additional types of experiments: measured step responses, arbitrary sets of input-output data, and estimated cross-covariance functions of input-output data. The methods are particularly well suited to systems with large input and/or output dimension, for which classical system identification methods based on maximum likelihood estimation may fail due to their reliance on non-convex optimizations. The realization-based methods by themselves require a finite number of linear algebraic operations. Because these methods implicitly optimize cost functions that are linear in state-space parameters, they may be augmented with convex constraints to form convex optimization problems. Several common behavioral constraints are translated into eigenvalue constraints stated as linear matrix inequalities, and the realization-based methods are converted into semidefinite programming problems. Some additional constraints on transient and steady-state behavior are derived and incorporated into a quadratic program, which is solved following the semidefinite program. The newly developed realization-based methods are applied to two experiments: the aeroelastic response of a fighter aircraft and the transient thermal behavior of a light-emitting diode. The algorithms for each experiment are implemented in two freely available software packages.
FEEDBACK REALIZATION OF HAMILTONIAN SYSTEMS
CHENG Daizhan; XI Zairong
2002-01-01
This paper investigates the relationship between state feedback and Hamiltonian realizatiou. First, it is proved that a completely controllable linear system always has a state feedback state equation Hamiltonian realization. Necessary and sufficient conditions are obtained for it to have a Hamiltonian realization with natural outpnt. Then some conditions for an affine nonlinear system to have a Hamiltonian realization arc given.For generalized outputs, the conditions of the feedback, keeping Hamiltonian, are discussed. Finally, the admissible feedback controls for generalized Hamiltonian systems are considered.
Realizations of the Canonical Representation
M K Vemuri
2008-02-01
A characterisation of the maximal abelian subalgebras of the bounded operators on Hilbert space that are normalised by the canonical representation of the Heisenberg group is given. This is used to classify the perfect realizations of the canonical representation.
Realization of Fractal Affine Transformation
无
2001-01-01
This paper gives the definition of fractal affine transformation and presents a specific method for its realization and its cor responding mathematical equations which are essential in fractal image construction.
Option Pricing using Realized Volatility
Stentoft, Lars Peter
In the present paper we suggest to model Realized Volatility, an estimate of daily volatility based on high frequency data, as an Inverse Gaussian distributed variable with time varying mean, and we examine the joint properties of Realized Volatility and asset returns. We derive the appropriate...... benchmark model estimated on return data alone. Hence the paper provides evidence on the value of using high frequency data for option pricing purposes....
Option Pricing using Realized Volatility
Stentoft, Lars Peter
In the present paper we suggest to model Realized Volatility, an estimate of daily volatility based on high frequency data, as an Inverse Gaussian distributed variable with time varying mean, and we examine the joint properties of Realized Volatility and asset returns. We derive the appropriate d...... benchmark model estimated on return data alone. Hence the paper provides evidence on the value of using high frequency data for option pricing purposes....
Single Boson Realizations of the Higgs Algebra
RUANDong; WUChu; SUNHong-Zhou
2003-01-01
We obtained for the Higgs algebra three kinds of single boson realizations such as the unitary Holstein-Primakoff-like realization, the non-unitary Dyson-like realization, and the unitary Villain-like realization. The corre-sponding similarity transformations between the Holstein-Primakoff-like realizations and the Dyson-like realizations are given.
Multiple realizability and biological laws.
Raerinne, Jani P; Eronen, Markus I
2012-01-01
We critically analyze Alexander Rosenberg's argument based on the multiple realizability of biological properties that there are no biological laws. The argument is intuitive and suggestive. Nevertheless, a closer analysis reveals that the argument rests on dubious assumptions about the nature of natural selection, laws of nature, and multiple realizability. We also argue that the argument is limited in scope, since it applies to an outmoded account of laws and the applicability of the argument to other more promising accounts of laws is questionable. Another concern of ours is that the relation between multiple realizability and natural selection is more complex than Rosenberg acknowledges. Finally, we claim that an explanation for why Rosenberg's argument appears persuasive and appealing is that the argument is based on an inflated concept of multiple realizability that rests on unreliable intuitions concerning what counts as a different realization of the same property. Consequently, we argue that the argument is at best inconclusive and at worst false insofar as its implications for the existence of biological laws are concerned.
Realization of New and Enhanced Materials Properties Through Nanostructural Control
2006-05-15
by modifying limits of integration over certain orientational variables [1,64,66]. Typical agreement between theory and experiment is shown below...must be different to realize an entropy enhancement, our preliminary experiments indicate that the difference can be realized in 400 ! , 5 . 3146-C168(75...Lecture: "Rational Desing of Nanostructured Organic Electro-Optic Materials". Conference-January 15-20, 2006--Conference on Photoresponsive Organics and
Approximate Counting of Graphical Realizations.
Erdős, Péter L; Kiss, Sándor Z; Miklós, István; Soukup, Lajos
2015-01-01
In 1999 Kannan, Tetali and Vempala proposed a MCMC method to uniformly sample all possible realizations of a given graphical degree sequence and conjectured its rapidly mixing nature. Recently their conjecture was proved affirmative for regular graphs (by Cooper, Dyer and Greenhill, 2007), for regular directed graphs (by Greenhill, 2011) and for half-regular bipartite graphs (by Miklós, Erdős and Soukup, 2013). Several heuristics on counting the number of possible realizations exist (via sampling processes), and while they work well in practice, so far no approximation guarantees exist for such an approach. This paper is the first to develop a method for counting realizations with provable approximation guarantee. In fact, we solve a slightly more general problem; besides the graphical degree sequence a small set of forbidden edges is also given. We show that for the general problem (which contains the Greenhill problem and the Miklós, Erdős and Soukup problem as special cases) the derived MCMC process is rapidly mixing. Further, we show that this new problem is self-reducible therefore it provides a fully polynomial randomized approximation scheme (a.k.a. FPRAS) for counting of all realizations.
Approximate Counting of Graphical Realizations.
Péter L Erdős
Full Text Available In 1999 Kannan, Tetali and Vempala proposed a MCMC method to uniformly sample all possible realizations of a given graphical degree sequence and conjectured its rapidly mixing nature. Recently their conjecture was proved affirmative for regular graphs (by Cooper, Dyer and Greenhill, 2007, for regular directed graphs (by Greenhill, 2011 and for half-regular bipartite graphs (by Miklós, Erdős and Soukup, 2013. Several heuristics on counting the number of possible realizations exist (via sampling processes, and while they work well in practice, so far no approximation guarantees exist for such an approach. This paper is the first to develop a method for counting realizations with provable approximation guarantee. In fact, we solve a slightly more general problem; besides the graphical degree sequence a small set of forbidden edges is also given. We show that for the general problem (which contains the Greenhill problem and the Miklós, Erdős and Soukup problem as special cases the derived MCMC process is rapidly mixing. Further, we show that this new problem is self-reducible therefore it provides a fully polynomial randomized approximation scheme (a.k.a. FPRAS for counting of all realizations.
PRAGMATIC TRANSFER IN REQUEST REALIZATIONS
Indawan Syahri
2007-01-01
Full Text Available This study investigates the pragmatic transfer in English request realizations made by EFL learners, i.e. the proficient learners. The subjects were students of an English Study Program who obtained TOEFL-like scores of at least 450. The data were collected by means of DCT-questionnaires and Role-plays. The results show that the subjects realize requests in the form of external modifications more frequently. Most of them embed their requests with supportive moves dominantly. They enfold the acts with the moves before, after or in both positions. Of the three positions, they mostly insert the moves initial position, i.e., through inductive patterns. This is due to pragmatic transfer.
Linguistic granular model: design and realization
YUE Shihong; LI Ping; SONG Zhihuan
2005-01-01
A new linguistic granular model is proposed and the effect of its parameters on the output is analyzed. The design of the model consists of two stages: using conditional fuzzy clustering for information granular, and integrating all information granules to final output. The integrating tool is fuzzy integral based on fuzzy measure, and the generalization of fuzzy integral increases flexibility of the linguistic granular model greatly. A heuristic algorithm to determine the parameters in the fuzzy integral is used to realize the linguistic model. Two experiments verify the feasibility of the proposed model.
Carbon. Examples of Property Realization
Kossko, I. A.; A.A. Onoprienko; Kossko, T.G.
2013-01-01
Examples of realization of carbon properties in formation of section near-surface boundaries defining the mechanism of oxidizing (normal) wear are presented. Synthesis of strengt hening diamond- lonsdaleite -carbene «frame» and graphite with function of solid lubricant on a friction surface in high-desperse carbon environment is reviewed. Prospects of carbon ap placation in implementation of the concept of electronics on one element, and also use of thin-film structures of amorphous carbon – ...
Experimental realization of quantum illumination.
Lopaeva, E D; Ruo Berchera, I; Degiovanni, I P; Olivares, S; Brida, G; Genovese, M
2013-04-12
We present the first experimental realization of the quantum illumination protocol proposed by Lloyd [Science 321, 1463 (2008)] and S. Tan et al. [Phys. Rev. Lett. 101, 253601 (2008)], achieved in a simple feasible experimental scheme based on photon-number correlations. A main achievement of our result is the demonstration of a strong robustness of the quantum protocol to noise and losses that challenges some widespread wisdom about quantum technologies.
Carbon. Examples of Property Realization
I.A. Kossko
2013-11-01
Full Text Available Examples of realization of carbon properties in formation of section near-surface boundaries defining the mechanism of oxidizing (normal wear are presented. Synthesis of strengt hening diamond- lonsdaleite -carbene «frame» and graphite with function of solid lubricant on a friction surface in high-desperse carbon environment is reviewed. Prospects of carbon ap placation in implementation of the concept of electronics on one element, and also use of thin-film structures of amorphous carbon – metal for data recording are discussed.
PREFACE: Nanospintronics design and realization
Akai, Hisazumi; Katayama-Yoshida, Hiroshi; Kasai, Hideaki
2004-12-01
This special issue of Journal of Physics: Condensed Matter contains selected papers from the 1st International Conference on Nanospintronics Design and Realization (ICNDR 2004), which was held in Kyoto, Japan, 24--28 May 2004. This conference was organized by the Nanospintronics Design and Realization project members: Hideaki Kasai, Osaka (Chair of the Conference) Hisazumi Akai, Osaka Hajime Asahi, Osaka Wilson Agerico Diño, Osaka Hiroshi Harima, Kyoto Tomoyuki Kakeshita, Osaka Junjiro Kanamori, Kyoto Hiroshi Katayama-Yoshida, Osaka Koichi Kusakabe, Osaka Hiroshi Nakanishi, Osaka (Secretary) Tamio Oguchi, Hiroshima Teruo Ono, Osaka Naoshi Suzuki, Osaka Hitoshi Tabata, Osaka under the auspices of the Japan Ministry of Education, Culture, Sports, Science and Technology (MEXT) Special Coordination Funds for Promoting Science and Technology, and the sponsorship of Osaka University and the International Institute for Advanced Studies (IIAS). The conference is intended to provide an international forum for experimental and theoretical researchers, in the rapidly developing field of nanospintronics. It aims to: provide an overview of our current understanding of the physics of spin transport in (magnetic) semiconductors and hybrid magnetic/semiconductor structures; provide a venue to present and discuss the latest developments in using spin-dependent phenomena in nano-(opto-) electronics and computing applications; provide a venue for discussion and assessment of other possible means of exploiting the spin-dependent phenomena in future nano-(opto-) electronic and computing applications; address current (and foreseeable future) problems, of fundamental and applied nature, in an effort to bridge the physics and technology gap between semiconducting and magnetic materials. All of these being geared towards bringing about the realization of a functioning nanospintronics. A total of 127 delegates from 15 countries took part in ICNDR 2004, which was comprised of 62 invited
Circuit realization of the fractional-order unified chaotic system
Chen Xiang-Rong; Liu Chong-Xin; Wang Fa-Qiang
2008-01-01
This paper studies the chaotic behaviours of the fractional-order unified chaotic system.Based on the approximation method in frequency domain,it proposes an electronic circuit model of tree shape to realize the fractional-order operator.According to the tree shape model,an electronic circuit is designed to realize the 2.7-order unified chaotic system.Numerical simulations and circuit experiments have verified the existence of chaos in the fraction-order unified system.
Space project IONOSAT- MICRO - goals and realization
Korepanov, Valery; Lizunov, Georgii; Fedorov, Oleg
2013-04-01
The IONOSAT-MICRO project is a first stage of IONOSAT program devoted to the multi-point global monitoring of dynamic processes in the ionosphere. The IONOSAT program is planned to be realized in 2015-2020 with the help of three satellites at coordinated low Earth orbits (LEO). IONOSAT-MICRO is the forerunner project scheduled for launch in 2014 at sun-synchronous orbit with the aim to test the IONOSAT mission scientific postulates and preliminary collection of related space data. The main goal of the IONOSAT-MICRO project is the systematic study of the dynamic response of the ionosphere to the influence "from above" (sun, geomagnetic activity) and "from below" (powerful meteorological, seismic and anthropogenic impacts). More in details, the study of following formations in the ionosphere is foreseen: - Space-temporal structure and global distribution of inhomogeneities in neutral atmosphere and ionosphere; - Global structure and dynamics of quasi-stationary electric currents, electric and magnetic fields; - Wave structures and turbulences at different spatial and temporal scales. To realize such a research, the scientific payload of the MICROSAT spacecraft will provide the measurements of following parameters: - Neutral gas and plasma parameters - concentration, temperature; - DC-ELF-VLF electromagnetic field vectors and ELF-VLF plasma current fluctuations; - Total electron content (TEC); - Spectral content of plasma oscillations. Synchronous experiments with ground support facilities - both active and passive ones - are also foreseen. The IONOSAT-MICRO project will be realized onboard of MICROSAT microsatellite platform, manufactured by Yuzhnoye Design Office with new experimental models of ammonia propulsion system, battery, solar arrays and panels with thermal control coating, the in-flight tests of which are also planned in frames of the project. The composition of the scientific equipment developed by the international team of participants and sensors
On Realization of Technological productivity
SOILORW.
2000-01-01
Technology has been a major force in modem economic development and world economy, but technology is only potential productivity and has a long distance from real productive forces. There are two major paths in turning technology into real productive forces. First, technological innovation is a process in which technology is tranaformed into real productivity in essence . The market is another channel for transformation of technology into productive forces. The transformation of technology into productive forces has its laws and mechanisms. In China, there are many obstacles to transformation of technology into real productive forces. We must take seventeen pieces of countermeasures to overcome these obstacles, and speed up the realization of technological productive forces.
Rashba realization: Raman with RF
Campbell, Daniel L
2015-01-01
We theoretically explore a Rashba spin-orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can be continuously opened or closed by modifying laser polarizations. Our technique uses far-detuned "Raman" laser coupling to create the Rashba potential, which has the benefit of low spontaneous emission rates. At these detunings, the Raman matrix elements that link $m_F$ magnetic sublevel quantum numbers separated by two are also suppressed. These matrix elements are necessary to produce the Rashba Hamiltonian within a single total angular momentum $f$ manifold. However, the far-detuned Raman couplings can link the three XYZ states familiar to quantum chemistry, which possess the necessary connectivity to realize the Rashba potential. We show that these XYZ states are essentially the hyperfine spin eigenstates of $^{87}\\text{Rb}$ dressed by a strong radio-fr...
Design and realization of CMOS image sensor
Xu, Jian; Xiao, Zexin
2008-02-01
A project was presented that instrumental design of an economical CMOS microscope image sensor. A high performance, low price, black-white camera chip OV5116P was used as the core of the sensor circuit; Designing and realizing peripheral control circuit of sensor; Through the control on dial switch to realize different functions of the sensor chip in the system. For example: auto brightness level descending function on or off; gamma correction function on or off; auto and manual backlight compensation mode conversion and so on. The optical interface of sensor is designed for commercialization and standardization. The images of sample were respectively gathered with CCD and CMOS. Result of the experiment indicates that both performances were identical in several aspects as follows: image definition, contrast control, heating degree and the function can be adjusted according to the demand of user etc. The imperfection was that the CMOS with smaller field and higher noise than CCD; nevertheless, the maximal advantage of choosing the CMOS chip is its low cost. And its imaging quality conformed to requirement of the economical microscope image sensor.
A Realization Approach for Residual Expressions
Skovmose Kallesøe, Carsten; Izadi-Zamanabadi, Roozbeh; Wisniewski, Rafal
2006-01-01
This paper is concerned with state space realization of inherent redundant information in subsystems, which are identified by structural analysis (SA) approach. The identified subsystems are assumed to involve algebraic variables, representing unknown signals. The proposed realization method...
Realization of Thermal Inertia in Frequency Domain
Boe-Shong Hong
2014-02-01
Full Text Available To realize the lagging behavior in heat conduction observed in these two decades, this paper firstly theoretically excludes the possibility that the underlying thermal inertia is a result of the time delay in heat diffusion. Instead, we verify in experiments the electro-thermal analogy, wherein the thermal inertial is parameterized by thermal inductance that formulates hyperbolic heat-conduction. The thermal hyperbolicity exhibits a special frequency response in Bode plot, wherein the amplitude ratios is kept flat after crossing some certain frequency, as opposed to Fourier heat-conduction. We apply this specialty to design an instrument that reliably identifies thermal inductances of some materials in frequency domain. The instrument is embedded with a DSP-based frequency synthesizer capable of modulating frequencies in utmost high-resolution. Thermal inertia implies a new possibility for energy storage in analogy to inductive energy storage in electricity or mechanics.
Rashba realization: Raman with RF
Campbell, D L; Spielman, I B
2016-01-01
We theoretically explore a Rashba spin–orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can be continuously opened or closed by modifying laser polarizations. Our technique uses far-detuned ‘Raman’ laser coupling to create the Rashba potential, which has the benefit of low spontaneous emission rates. At these detunings, the Raman matrix elements that link mF magnetic sublevel quantum numbers separated by two are also suppressed. These matrix elements are necessary to produce the Rashba Hamiltonian within a single total angular momentum f manifold. However, the far-detuned Raman couplings can link the three XYZ states familiar to quantum chemistry, which possess the necessary connectivity to realize the Rashba potential. We show that these XYZ states are essentially the hyperfine spin eigenstates of 87Rb dressed by a strong radio-frequency magnetic field. PMID:27524933
Classical realizability in the CPS target language
Frey, Jonas
2016-01-01
Motivated by considerations about Krivine's classical realizability, we introduce a term calculus for an intuitionistic logic with record types, which we call the CPS target language. We give a reformulation of the constructions of classical realizability in this language, using the categorical...... techniques of realizability triposes and toposes. We argue that the presentation of classical realizability in the CPS target language simplifies calculations in realizability toposes, in particular it admits a nice presentation of conjunction as intersection type which is inspired by Girard's ludics....
Learning, Realizability and Games in Classical Arithmetic
Aschieri, Federico
2010-01-01
In this dissertation we provide mathematical evidence that the concept of learning can be used to give a new and intuitive computational semantics of classical proofs in various fragments of Predicative Arithmetic. First, we extend Kreisel modified realizability to a classical fragment of first order Arithmetic, Heyting Arithmetic plus EM1 (Excluded middle axiom restricted to Sigma^0_1 formulas). We introduce a new realizability semantics we call "Interactive Learning-Based Realizability". Our realizers are self-correcting programs, which learn from their errors and evolve through time. Secondly, we extend the class of learning based realizers to a classical version PCFclass of PCF and, then, compare the resulting notion of realizability with Coquand game semantics and prove a full soundness and completeness result. In particular, we show there is a one-to-one correspondence between realizers and recursive winning strategies in the 1-Backtracking version of Tarski games. Third, we provide a complete and fully...
郝世勇; 程政
2015-01-01
Despite various aircraft power supply system,the needs for maintenance personnel capacity training require a universal experiment system that can carry out multiple aircraft power equipments.Comprehensive and universal design method and modern measurement technology,such as computer measurement,virtual instruments,etc are used in the expetriment system.The experiment system can take experiment on aircraft main power system,secondary electrical power source,power system accessories,etc.The result shows that the universal experiment has a fine and reliable performance and reach to the design requirement.%针对军用飞机电源系统种类多，为保证在一种实验平台上实现多种电源装备的实验训练，满足机务维护人员能力培训的要求，研究设计了飞机电源系统综合实验平台。实验平台采用综合化、通用化的设计思路，综合运用计算机测控、虚拟仪器等现代测试技术，可实现飞机主电源系统、二次电源、控制保护类附件的性能测试实验，并具备新型设备的拓展实验能力。通过开展实验教学，证明该实验平台功能完善，性能稳定，设计方案合理，能够满足飞机电源系统通用性实验要求，具有很强的推广应用价值。
赵维佺; 魏小锐; 刘永波; 熊辉
2012-01-01
Experiment center homepage is the main platform for lab open management, exhibition exchange. Because of the present serious network security situation, based on the tamper-proof system design principle and the current main technology, a webpageltamper-proof is designed for experiment center. Starting with the deployment way and implementation ,principle of webpage system, three major modules design of web firewall, real-time blocking and intelligent analysis are discussed.%实验中心主页是中心进行开放管理、对外展示和技术交流的主要平台,针对目前严峻的网络安全形势,基于对网页防篡改系统设计原理和目前主流技术的分析,为实验中心设计实现了一类网页防篡改系统。从网页防篡改系统的部署方式、实现原理入手,对Web防火墙、实时阻断模块和BI智能分析模块三大模块的设计进行了阐述。
Hysteresis model of magnetostrictive actuators and its numerical realization
TANG Zhi-feng; LV Fu-zai; XIANG Zhan-qin
2007-01-01
This paper presents two numerical realization of Preisach model by Density Function Method (DFM) and F Function Method (FFM) for a giant magnetostrictive actuator (GMA). Experiment and simulation showed that FFM is better than DFM for predicting precision of hysteresis loops. Lagrange bilinear interpolation algorithm is used in Preisach numerical realization to enhance prediction performance. A set of hysteresis loops and higher order reversal curves are predicted and experimentally verified. The good agreement between the measured and predicted curves shows that the classical Preisach model is effective for modelling the quasi-static hysteresis of the GMA.
Experimental realization of entanglement concentration and a quantum repeater.
Zhao, Zhi; Yang, Tao; Chen, Yu-Ao; Zhang, An-Ning; Pan, Jian-Wei
2003-05-23
We report an experimental realization of entanglement concentration using two polarization-entangled photon pairs produced by pulsed parametric down-conversion. In the meantime, our setup also provides a proof-in-principle demonstration of a quantum repeater. The quality of our procedure is verified by observing a violation of Bell's inequality by more than 5 standard deviations. The high experimental accuracy achieved in the experiment implies that the requirement of tolerable error rate in multistage realization of quantum repeaters can be fulfilled, hence providing a useful toolbox for quantum communication over large distances.
Electronic circuit realization of the logistic map
Madhekar Suneel
2006-02-01
An electronic circuit realization of the logistic difference equation is presented using analog electronics. The behaviour of the realized system is evaluated against computer simulations of the same. The circuit is found to exhibit the entire range of dynamics of the logistic equation: ﬁxed points, periodicity, period doubling, chaos and intermittency. Quantitative measurements of the dynamics of the realized system are presented and are found to be in good agreement with the theoretical values. Some possible applications of such a realization are brieﬂy discussed.
李晓红
2012-01-01
在高效课堂的背景下，高中音乐教学既要面向全体学生，又要关注尊重学生的个性，实施快乐音乐教学，努力构建快乐的音乐课堂。要构建快乐音乐课堂，必须尊重学生的情感体验，激发学生的学习兴趣，鼓励学生积极参与音乐活动，注意培养学生的音乐鉴赏能力，最终获得高中音乐教学效果的艺术性、情感性与思想性的完整统一。% Under the background of classroom in high efficiency, high school music teaching should face to all students, but also pay attention to the respect of the personality of students,and construct happy music classroom.In order to construct happy music classroom, teachers must respect the students' emotional experience, and stimulate students' interest in study, encourage students to actively participate in music activities, and pay attention to the cultivation of the students' music appreciation ability. Eventually obtaining high school music teaching effect artistry, emotional and the integration of the ideological content.
New technology to realize printed radiating elements
Tarot, A. C.; Sharaiha, A.; Terret, C.; Garnier, Y.
1995-05-01
A plating process for low-cost dielectric substrates (like polypropylene or foam) has been developed by the CNET (Centre National d'Etudes des Telecommunications) in collaboration with LAM (Laboratoire Antennes et Microelectronique). This process allows the realization of printed radiating elements like microstrip antennas. An example of a multilayered printed antenna realized with this technology is presented with its performance.
FPGA realization of multi-scroll chaotic oscillators
Tlelo-Cuautle, E.; Rangel-Magdaleno, J. J.; Pano-Azucena, A. D.; Obeso-Rodelo, P. J.; Nunez-Perez, J. C.
2015-10-01
Chaotic oscillators have been realized using field-programmable gate arrays (FPGAs) showing good results. However, only 2-scrolls have been observed experimentally, and all reported works use commercially-available software tools for FPGA synthesis. In this manner, as a first contribution we show the FPGA realization of two multi-scroll chaotic oscillators that are characterized by their maximum Lyapunov exponent (MLE) for generating from 2- to 6-scrolls. The first multi-scroll chaotic oscillator is based on saturated function series and the second on Chua's circuit. As a second contribution, we show their hardware realization by applying two numerical methods: Forward Euler (FE) and Runge Kutta (RK). The advantage of realizing those multi-scroll chaotic oscillators is that one can avoid the use of multiplier entities, thus optimizing FPGA resources and increasing the processing speed, as we show by realizing single constant multiplication (SCM) blocks. The experiments are verified by performing co-simulation for an FPGA Spartan 3 of Xilinx. Finally, experimental results are shown for different values of MLE (already optimized) for both multi-scroll chaotic oscillators, and the FPGA used resources are listed for generating 6-scrolls when applying FE and RK.
窦兴川; 梁凯
2012-01-01
利用微波穿透非金属障碍物的特性可探测到人体的呼吸、心跳以及人体运动信号.为有效降低环境干扰,提高探测性能,文中分析障碍物的衰减特性,提出一种多频连续波发射技术,即采用UHF、L、S3个波段进行连续波同时发射,信号处理系统根据探测不同障碍物和不同环境条件,对不同人体特征(呼吸、心跳和体动)进行提取与分析.实验结果表明,多频穿透式人体探测方法可有效探测障碍物后的绝对静止人员的呼吸和心跳信号,对运动人体具有更强的探测能力.%The human body breathing, heartbeat and movement signal could be detected by the micro-wave's characteristic of penetration through non-mental obstacles. By analysing the attenuation characteristic of obstacles, a multi-frequency continuous wave transmit technology is proposed which can effectively reduce environmental interference and improve detection performance. While transmit the continuous wave in UHF、L and S band at the same time, the characteristics (breathing, heartbeat and movement signal ) of human bodies by different detection obstacles and environment are extracted and analysed in signal processing system. The experiment result shows that the multi-frequency penetration for human body detection method could effectively detect the breathing and heartbeat signal of an absolutely static person behind the obstacle, the method has a even stronger ability to detect the movement of human body.
The economic value of realized volatility
Christoffersen, Peter; Feunou, Bruno; Jacobs, Kris
2014-01-01
Many studies have documented that daily realized volatility estimates based on intraday returns provide volatility forecasts that are superior to forecasts constructed from daily returns only. We investigate whether these forecasting improvements translate into economic value added. To do so, we...... develop a new class of affine discrete-time option valuation models that use daily returns as well as realized volatility. We derive convenient closed-form option valuation formulas, and we assess the option valuation properties using Standard & Poor’s (S&P) 500 return and option data. We find...... that realized volatility reduces the pricing errors of the benchmark model significantly across moneyness, maturity, and volatility levels....
Experimental realization of nonadiabatic holonomic quantum computation.
Feng, Guanru; Xu, Guofu; Long, Guilu
2013-05-10
Because of its geometric nature, holonomic quantum computation is fault tolerant against certain types of control errors. Although proposed more than a decade ago, the experimental realization of holonomic quantum computation is still an open challenge. In this Letter, we report the first experimental demonstration of nonadiabatic holonomic quantum computation in a liquid NMR quantum information processor. Two noncommuting one-qubit holonomic gates, rotations about x and z axes, and the two-qubit holonomic CNOT gate are realized by evolving the work qubits and an ancillary qubit nonadiabatically. The successful realizations of these universal elementary gates in nonadiabatic holonomic quantum computation demonstrates the experimental feasibility of this quantum computing paradigm.
Hamiltonian realizations of nonlinear adjoint operators
Fujimoto, Kenji; Scherpen, Jacquelien M.A.; Gray, W. Steven
2002-01-01
This paper addresses the issue of state-space realizations for nonlinear adjoint operators. In particular, the relationships between nonlinear Hilbert adjoint operators, Hamiltonian extensions and port-controlled Hamiltonian systems are established. Then, characterizations of the adjoints of control
Hamiltonian Realizations of Nonlinear Adjoint Operators
Fujimoto, Kenji; Scherpen, Jacquelien M.A.; Gray, W. Steven
2000-01-01
This paper addresses state-space realizations for nonlinear adjoint operators. In particular the relationship among nonlinear Hilbert adjoint operators, Hamiltonian extensions and port-controlled Hamiltonian systems are clarified. The characterization of controllability, observability and Hankel ope
Modelling and Forecasting Multivariate Realized Volatility
Halbleib, Roxana; Voev, Valeri
2011-01-01
This paper proposes a methodology for dynamic modelling and forecasting of realized covariance matrices based on fractionally integrated processes. The approach allows for flexible dependence patterns and automatically guarantees positive definiteness of the forecast. We provide an empirical appl...
Nanofabrication and the realization of Feynman's two-slit experiment
Frabboni, Stefano; Gazzadi, Gian Carlo; Pozzi, Giulio
2008-08-01
Two nanosized slits are opened by focused ion beam milling in a membrane to observe, with a transmission electron microscope, electron interference fringes. Then, on the same sample, one of the slits is closed by focused ion beam induced deposition and the corresponding transmitted intensity is recorded. The comparison between the two measurements provides an impressive experimental evidence of the probability amplitude of quantum mechanics following step by step the original idea proposed by Feynman [The Feynman Lectures on Physics (Addison-Wesley, Reading, MA, 1966), Vol. 3, Chap. 1].
Realized GARCH: A Complete Model of Returns and Realized Measures of Volatility
Hansen, Peter Reinhard; Huang, Zhuo (Albert); Shek, Howard Howan
of the classical GARCH framework; it implies an ARMA structure for the conditional variance and realized measures of volatility; and models in this class are parsimonious and simple to estimate. A key feature of the Realized GARCH framework is a measurement equation that relates the observed realized measure...... to latent volatility. This equation facilitates a simple modeling of the dependence between returns and future volatility that is commonly referred to as the leverage effect. An empirical application with DJIA stocks and an exchange traded index fund shows that a simple Realized GARCH structure leads...
Enablers & Barriers for Realizing Modularity Benefits
Storbjerg, Simon Haahr; Brunø, Thomas Ditlev; Thyssen, Jesper
2012-01-01
Although modularization is becoming both a well-described domain in academia and a broadly applied concept in business, many of today’s firm still struggle to realize the promised benefits of this approach. Managing modularization is a complex matter, and in spite of this, a topic that has received...... are the organizational and systems related aspects. Recognizing the need for guidance to realize the benefits of modularity, the purpose of this study is through a literature study and a case study to improve the insight into the organizational and systems related enablers and barriers with regard to obtaining the full...
Paradigms for Realizing Machine Learning Algorithms.
Agneeswaran, Vijay Srinivas; Tonpay, Pranay; Tiwary, Jayati
2013-12-01
The article explains the three generations of machine learning algorithms-with all three trying to operate on big data. The first generation tools are SAS, SPSS, etc., while second generation realizations include Mahout and RapidMiner (that work over Hadoop), and the third generation paradigms include Spark and GraphLab, among others. The essence of the article is that for a number of machine learning algorithms, it is important to look beyond the Hadoop's Map-Reduce paradigm in order to make them work on big data. A number of promising contenders have emerged in the third generation that can be exploited to realize deep analytics on big data.
Design and realization of random measurement scheme for compressed sensing
XIE Cheng-jun; XU Lin
2012-01-01
Design and realization of random measurement scheme for compressed sensing (CS) are presented in this paper,and lower limits of the measurement number are achieved when the precise reconstruction is realized.Four kinds of random measurement matrices are designed according to the constraint conditions of random measurement.The performance is tested employing the algorithm of stagewise orthogonal matching pursuit (StOMP).Results of the experiment show that lower limits of the measurement number are much better than the results described in Refs.[ 13-15].When the ratios of measurement to sparsity are 3.8 and 4.0,the mean relative errors of the reconstructed signals are 8.57 × 10-13 and 2.43 × 10-14,respectively,which confirms that the random measurement scheme of this paper is very effective.
Implosion and heating experiments of fast ignition targets by Gekko-XII and LFEX lasers
Shiraga H.
2013-11-01
Full Text Available The FIREX-1 project, the goal of which is to demonstrate fuel heating up to 5 keV by fast ignition scheme, has been carried out since 2003 including construction and tuning of LFEX laser and integrated experiments. Implosion and heating experiment of Fast Ignition targets have been performed since 2009 with Gekko-XII and LFEX lasers. A deuterated polystyrene shell target was imploded with the 0.53- μm Gekko-XII, and the 1.053- μm beam of the LFEX laser was injected through a gold cone attached to the shell to generate hot electrons to heat the imploded fuel plasma. Pulse contrast ratio of the LFEX beam was significantly improved. Also a variety of plasma diagnostic instruments were developed to be compatible with harsh environment of intense hard x-rays (γ rays and electromagnetic pulses due to the intense LFEX beam on the target. Large background signals around the DD neutron signal in time-of-flight record of neutron detector were found to consist of neutrons via (γ,n reactions and scattered gamma rays. Enhanced neutron yield was confirmed by carefully eliminating such backgrounds. Neutron enhancement up to 3.5 × 107 was observed. Heating efficiency was estimated to be 10–20% assuming a uniform temperature rise model.
On the Nonuniqueness of Balanced Nonlinear Realizations
Gray, W. Steven; Scherpen, Jacquelien M.A.
1999-01-01
The notion of balanced realizations for nonlinear state space model reduction problems was first introduced by Scherpen in 1993. Analogous to'the linear case, the so called singular value functions of a system describe the relative importance of each state component from an input-output point of vie
FPGA Realization of Memory 10 Viterbi Decoder
Paaske, Erik; Bach, Thomas Bo; Andersen, Jakob Dahl
1997-01-01
sequence mode when feedback from the Reed-Solomon decoder is available. The Viterbi decoder is realized using two Altera FLEX 10K50 FPGA's. The overall operating speed is 30 kbit/s, and since up to three iterations are performed for each frame and only one decoder is used, the operating speed...
The economic value of realized volatility
Christoffersen, Peter; Feunou, Bruno; Jacobs, Kris
2014-01-01
develop a new class of affine discrete-time option valuation models that use daily returns as well as realized volatility. We derive convenient closed-form option valuation formulas, and we assess the option valuation properties using Standard & Poor’s (S&P) 500 return and option data. We find...
Enablers & Barriers for Realizing Modularity Benefits
Storbjerg, Simon Haahr; Brunø, Thomas Ditlev; Thyssen, Jesper
2012-01-01
are the organizational and systems related aspects. Recognizing the need for guidance to realize the benefits of modularity, the purpose of this study is through a literature study and a case study to improve the insight into the organizational and systems related enablers and barriers with regard to obtaining the full...
Realizability of stationary spherically symmetric transonic accretion
Ray, A K; Ray, Arnab K.
2002-01-01
The spherically symmetric stationary transonic (Bondi) flow is considered a classic example of an accretion flow. This flow, however, is along a separatrix, which is usually not physically realizable. We demonstrate, using a pedagogical example, that it is the dynamics which selects the transonic flow.
Measuring volatility with the realized range
M.P.E. Martens (Martin); D.J.C. van Dijk (Dick)
2006-01-01
textabstractRealized variance, being the summation of squared intra-day returns, has quickly gained popularity as a measure of daily volatility. Following Parkinson (1980) we replace each squared intra-day return by the high-low range for that period to create a novel and more efficient estimator
On Expectations, Realizations and Partial Retirement
Mastrogiacomo, Mauro
2004-01-01
This study investigates whether many people fear an unexpectedshock in their financial situation around retirement and whether therelated expectations and realizations match each other. We use theDutch Social Economic Panel survey data, where expectations aboutthe next year's financial situation are
ROLE OF INTERNET IN INSURANCE SERVICES REALIZATION
N. Prikazyuk
2014-03-01
Full Text Available The role of the Internet in the implementation of insurance products is investigated. It is founded the Internet in insurance performs presentable and realizable function. The benefits of using Internet technologies for business of insurance market are determined.
Realization of the BIH terrestrial system
Boucher, C.; Feissel, M.
From 1968 through 1983, the BIH has maintained the orientation of the axes of a conventional terrestrial system on the basis of the stability of time series of the earth rotation parameters (ERP) that are implicitly referred to it. The principles of the definition and maintenance of this system are recalled, and its precision and long term stability are evaluated. It is now possible to realize the terrestrial reference system of the BIH, including the origin and orientation of the axes and the scale unit, on the basis of the permanent stations used in the monitoring of the earth's rotation by space geodesy. The transition to the proposed new realization is described. The principles of the future maintenance and dissemination of the BIH terrestrial system are also outlined.
Realization of DVCCTA Based Versatile Modulator
Neeta Pandey
2014-01-01
Full Text Available A Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA based versatile modulator is proposed which can work as an amplitude modulator, frequency modulator, delta modulator, and sigma delta modulator. The modulator operational scheme uses pulse generator as a core and its output is used as carrier signal. A DVCCTA based pulse generator is proposed first and subsequently configured as different modulators. Compact realization is the key feature of the proposed circuit as it uses two DVCCTA; a grounded resistor and a grounded capacitor hence are appropriate for IC realization. The functionality of the proposed circuit is verified through SPICE simulations using TSMC 0.25 μm CMOS process model parameters. The performance parameters such as power dissipation and noise for various modulator schemes are also obtained.
Realizing and optimizing an atomtronic SQUID
Mathey, Amy C.; Mathey, L.
2016-05-01
We demonstrate how a toroidal Bose-Einstein condensate with a movable barrier can be used to realize an atomtronic SQUID. The magnitude of the barrier height, which creates the analogue of an SNS junction, is of crucial importance, as well as its ramp-up and -down protocol. For too low of a barrier, the relaxation of the system is dynamically suppressed, due to the small rate of phase slips at the barrier. For a higher barrier, the phase coherence across the barrier is suppressed due to thermal fluctuations, which are included in our Truncated Wigner approach. Furthermore, we show that the ramp-up protocol of the barrier can be improved by ramping up its height first, and its velocity after that. This protocol can be further improved by optimizing the ramp-up and ramp-down time scales, which is of direct practical relevance for on-going experimental realizations.
Estimating quadratic variation using realized variance
Barndorff-Nielsen, Ole Eiler; Shephard, N.
2002-01-01
This paper looks at some recent work on estimating quadratic variation using realized variance (RV) - that is, sums of M squared returns. This econometrics has been motivated by the advent of the common availability of high-frequency financial return data. When the underlying process is a semimar......This paper looks at some recent work on estimating quadratic variation using realized variance (RV) - that is, sums of M squared returns. This econometrics has been motivated by the advent of the common availability of high-frequency financial return data. When the underlying process...... have to impose some weak regularity assumptions. We illustrate the use of the limit theory on some exchange rate data and some stock data. We show that even with large values of M the RV is sometimes a quite noisy estimator of integrated variance. Copyright © 2002 John Wiley & Sons, Ltd....
Effective complexity of stationary process realizations
Ay, Nihat; Szkola, Arleta
2010-01-01
The concept of effective complexity of an object as the minimal description length of its regularities has been initiated by Gell-Mann and Lloyd. Based on their work we gave a precise definition of effective complexity of finite binary strings in terms of algorithmic information theory in our previous paper. Here we study the effective complexity of strings generated by stationary processes. Sufficiently long typical process realizations turn out to be effectively simple under any linear scaling with the string's length of the parameter $\\Delta$ which determines the minimization domain. For a class of computable ergodic processes including i.i.d. and ergodic Markovian processes a stronger result can be shown: There exist sublinear scalings of $\\Delta$ for which typical realizations turn out to be effectively simple. Our results become most transparent in the context of coarse effective complexity --a modification of plain effective complexity, where $\\Delta$ appears as a minimization argument. A similar modif...
Experimental Realization of a Quantum Pentagonal Lattice
Yamaguchi, Hironori; Okubo, Tsuyoshi; Kittaka, Shunichiro; Sakakibara, Toshiro; Araki, Koji; Iwase, Kenji; Amaya, Naoki; Ono, Toshio; Hosokoshi, Yuko
2015-01-01
Geometric frustration, in which competing interactions give rise to degenerate ground states, potentially induces various exotic quantum phenomena in magnetic materials. Minimal models comprising triangular units, such as triangular and Kagome lattices, have been investigated for decades to realize novel quantum phases, such as quantum spin liquid. A pentagon is the second-minimal elementary unit for geometric frustration. The realization of such systems is expected to provide a distinct platform for studying frustrated magnetism. Here, we present a spin-1/2 quantum pentagonal lattice in the new organic radical crystal α-2,6-Cl2-V [=α-3-(2,6-dichlorophenyl)-1,5-diphenylverdazyl]. Its unique molecular arrangement allows the formation of a partially corner-shared pentagonal lattice (PCPL). We find a clear 1/3 magnetization plateau and an anomalous change in magnetization in the vicinity of the saturation field, which originate from frustrated interactions in the PCPL. PMID:26468930
Acoustic wave science realized by metamaterials.
Lee, Dongwoo; Nguyen, Duc Minh; Rho, Junsuk
2017-01-01
Artificially structured materials with unit cells at sub-wavelength scale, known as metamaterials, have been widely used to precisely control and manipulate waves thanks to their unconventional properties which cannot be found in nature. In fact, the field of acoustic metamaterials has been much developed over the past 15 years and still keeps developing. Here, we present a topical review of metamaterials in acoustic wave science. Particular attention is given to fundamental principles of acoustic metamaterials for realizing the extraordinary acoustic properties such as negative, near-zero and approaching-infinity parameters. Realization of acoustic cloaking phenomenon which is invisible from incident sound waves is also introduced by various approaches. Finally, acoustic lenses are discussed not only for sub-diffraction imaging but also for applications based on gradient index (GRIN) lens.
Exploring heterogeneous market hypothesis using realized volatility
Chin, Wen Cheong; Isa, Zaidi; Mohd Nor, Abu Hassan Shaari
2013-04-01
This study investigates the heterogeneous market hypothesis using high frequency data. The cascaded heterogeneous trading activities with different time durations are modelled by the heterogeneous autoregressive framework. The empirical study indicated the presence of long memory behaviour and predictability elements in the financial time series which supported heterogeneous market hypothesis. Besides the common sum-of-square intraday realized volatility, we also advocated two power variation realized volatilities in forecast evaluation and risk measurement in order to overcome the possible abrupt jumps during the credit crisis. Finally, the empirical results are used in determining the market risk using the value-at-risk approach. The findings of this study have implications for informationally market efficiency analysis, portfolio strategies and risk managements.
Realization and preliminary measurements on a 94 GHz SIS mixer
Oberto, L; Fretto, M; Tartari, A; Brunetti, L; Lacquaniti, V
2010-01-01
In this paper we present the realization and a preliminary characterization of a SIS based receiver. It has been developed for the MASTER experiment that consists in a three-band SIS receiver (94, 225 and 345 GHz) for astrophysical observations through the atmospheric windows available at high altitude dry sites. The measurements performed establish an upper limit to the overall receiver noise temperature. A comparison has been tried with the MASTER requirements and with state of the art results. A noise figure of 110 K has been obtained at 94 GHz, about 22 times the quantum limit.
Realization of fractional-order Liu chaotic system by circuit
Lu Jun-Jie; Liu Chong-Xin
2007-01-01
In this paper, chaotic behaviours in the fractional-order Liu system are studied. Based on the approximation theory of fractional-order operator, circuits are designed to simulate the fractional- order Liu system with q = 0.1 - 0.9 in a step of 0.1, and an experiment has demonstrated the 2.7-order Liu system. The simulation results prove that the chaos exists indeed in the fractional-order Liu system with an order as low as 0.3. The experimental results prove that the fractional-order chaotic system can be realized by using hardware devices, which lays the foundation for its practical applications.
AstroSat – Configuration and Realization
K. H. Navalgund; K. Suryanarayana Sarma; Piyush Kumar Gaurav; G. Nagesh; M. Annadurai
2017-06-01
AstroSat is India’s first space-based observatory satellite dedicated to astronomy. It has the capability to perform multi-wavelength and simultaneous observations of cosmic bodies in a wide band of wavelengths. This paper briefly summarizes the challenges faced in the configuration of AstroSat spacecraft, accommodation and sizing of its critical subsystems, their realization and testing of payloads and the integrated satellite.
The impact of voice on speech realization
Jelka Breznik
2014-01-01
The study discusses spoken literary language and the impact of voice on speech realization. The voice consists of a sound made by a human being using the vocal folds for talking, singing, laughing, crying, screaming… The human voice is specifically the part of human sound production in which the vocal folds (vocal cords) are the primary sound source. Our voice is our instrument and identity card. How does the voice (voice tone) affect others and how do they respond, positively or negatively? ...
Optical realization of the dissipative quantum oscillator
Longhi, Stefano
2016-01-01
An optical realization of the damped quantum oscillator, based on transverse light dynamics in an optical resonator with slowly-moving mirrors, is theoretically suggested. The optical resonator setting provides a simple implementation of the time-dependent Caldirola-Kanai Hamiltonian of the dissipative quantum oscillator, and enables to visualize the effects of damped oscillations in the classical (ray optics) limit and wave packet collapse in the quantum (wave optics) regime.
Modular realizations of hyperbolic Weyl groups
Kleinschmidt, Axel; Palmkvist, Jakob
2010-01-01
We study the recently discovered isomorphisms between hyperbolic Weyl groups and unfamiliar modular groups. These modular groups are defined over integer domains in normed division algebras, and we focus on the cases involving quaternions and octonions. We outline how to construct and analyse automorphic forms for these groups; their structure depends on the underlying arithmetic properties of the integer domains. We also give a new realization of the Weyl group W(E8) in terms of unit octavians and their automorphism group.
Realizing Mobile Web Services for Dynamic Applications
Zaplata, Sonja; Dreiling, Viktor; Lamersdorf, Winfried
Use of web services also on mobile devices becomes increasingly relevant. However, realizing such mobile web services based on the standard protocol stack is often inappropriate for resource-restricted mobile devices in dynamic networks. On the other hand, using specialized alternative protocols restricts compatibility with traditional service applications. Thus, existing approaches often do not allow to integrate heterogeneous service instances dynamically, as it is, e.g., required for executing mobile service-based business processes.
Experimental functional realization of attribute grammar system
I. Attali
2002-07-01
Full Text Available In this paper we present an experimental functional realization of attribute grammar(AG system for personal computers. For AG system functioning only Turbo Prolog compiler is required. The system functioning is based on a specially elaborated metalanguage for AG description, universal syntactic and semantic constructors. The AG system provides automatic generation of target compiler (syntax--oriented software using Turbo Prolog as object language.
Realization of Ridge Regression in MATLAB
Dimitrov, S.; Kovacheva, S.; Prodanova, K.
2008-10-01
The least square estimator (LSE) of the coefficients in the classical linear regression models is unbiased. In the case of multicollinearity of the vectors of design matrix, LSE has very big variance, i.e., the estimator is unstable. A more stable estimator (but biased) can be constructed using ridge-estimator (RE). In this paper the basic methods of obtaining of Ridge-estimators and numerical procedures of its realization in MATLAB are considered. An application to Pharmacokinetics problem is considered.
A realizable quantum encryption algorithm for qubits
Zhou Nan-Run; Zeng Gui-Hua
2005-01-01
A realizable quantum encryption algorithm for qubits is presented by employing bit-wise quantum computation.System extension and bit-swapping are introduced into the encryption process, which makes the ciphertext space expanded greatly. The security of the proposed algorithm is analysed in detail and the schematic physical implementation is also provided. It is shown that the algorithm, which can prevent quantum attack strategy as well as classical attack strategy, is effective to protect qubits. Finally, we extend our algorithm to encrypt classical binary bits and quantum entanglements.
APM Best Practices Realizing Application Performance Management
Sydor, Michael J
2011-01-01
The objective of APM Best Practices: Realizing Application Performance Management is to establish reliable application performance management (APM) practices - to demonstrate value, to do it quickly, and to adapt to the client circumstances. It's important to balance long-term goals with short-term deliverables, but without compromising usefulness or correctness. The successful strategy is to establish a few reasonable goals, achieve them quickly, and then iterate over the same topics two more times, with each successive iteration expanding the skills and capabilities of the APM team. This str
Superworldvolume dynamics of superbranes from nonlinear realizations
Bellucci, S. [Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Frascati, RM (Italy); Ivanov, E. [Paris Univ., Paris (France). Lab. de Physique Theorique et des Hautes Energies]|[Bogoliubov Laboratory of Theoretical Physics, Dubna, Moscow (USSR); Krivonos, S. [Bogoliubov Laboratory of Theoretical Physics, Dubna, Moscow (USSR)
2000-07-01
Based on the concept of the partial breaking of global supersymmetry (PBGS), it has been derived the worldvolume superfield equations of motion for N=1, D=4 supermembrane, as well as for the space-time filling D2- and D3-branes, from nonlinear realizations of the corresponding supersymmetries. It has been argued that it is of no need to take care of the relevant automorphism groups when being interested in the dynamical equations. This essentially facilitates computations. As a by-product, it has been obtained a new polynomial representation for the d=3,4 Born-Infeld equations, with merely a cubic nonlinearity.
Modelling and Forecasting Multivariate Realized Volatility
Chiriac, Roxana; Voev, Valeri
This paper proposes a methodology for modelling time series of realized covariance matrices in order to forecast multivariate risks. The approach allows for flexible dynamic dependence patterns and guarantees positive definiteness of the resulting forecasts without imposing parameter restrictions....... We provide an empirical application of the model, in which we show by means of stochastic dominance tests that the returns from an optimal portfolio based on the model's forecasts second-order dominate returns of portfolios optimized on the basis of traditional MGARCH models. This result implies...
Developing communications requirements for Agile Product Realization
Forsythe, C.; Ashby, M.R.
1994-03-01
Sandia National Laboratories has undertaken the Agile Product Realization for Innovative electroMEchanical Devices (A-PRIMED) pilot project to develop and implement technologies for agile design and manufacturing of electrochemical components. Emphasis on information-driven processes, concurrent engineering and multi-functional team communications makes computer-supported cooperative work critical to achieving significantly faster product development cycles. This report describes analyses conducted in developing communications requirements and a communications plan that addresses the unique communications demands of an agile enterprise.
Topological descendants DDK and KM realizations
Gato-Rivera, Beatriz; Gato-Rivera, Beatriz; Rosado, Jose Ignacio
1994-01-01
The "minimal matter + scalar" system can be embedded into the twisted N=2 topological algebra in two ways: a la DDK or a la KM. Here we present some results concerning the topological descendants and their DDK and KM realizations. In particular, we prove four "no-ghost" theorems (two for null states) regarding the reduction of the topological descendants into secon- daries of the "minimal matter + scalar" conformal field theory. We write down the relevant expressions for the case of level 2 descendants.
Stylized facts and multiple realizability in econophysics
Christophe Schinckus
2014-01-01
Full Text Available Stylized facts are persistent macro-regularities which cannot be described in terms of microeconomic theory. Through the argument of multiple realizability, this methodological paper claims that a top down agent-based econophysics can contribute to a better understanding of complex economic systems in two ways: on the one hand, it clarifies the gap between micro and macro scales by proving an algorithmic derivability of the latter; and on the other hand, this modelling provides microfoundations (and then potentially an economic meaning to macro-patterns usually identified in the observation of these complex systems.
Denicourt, Ch.
2004-07-01
This document presents the action realized in Pic Saint Loup secondary school, concerning the program management of an environmental quality building (HQE). The 8 chapters details the realization of the HQE building, the project planing of a HQE building, the Pic Saint Loup project, the operation beginning, the planing implementing, the project feasibility evaluation, the program redaction and the time and cost evaluation. (A.L.B.)
New approaches to generalized Hamiltonian realization of autonomous nonlinear systems
王玉振; 李春文; 程代展
2003-01-01
The Hamiltonian function method plays an important role in stability analysis and stabilization. The key point in applying the method is to express the system under consideration as the form of dissipative Hamiltonian systems, which yields the problem of generalized Hamiltonian realization. This paper deals with the generalized Hamiltonian realization of autonomous nonlinear systems. First, this paper investigates the relation between traditional Hamiltonian realizations and first integrals, proposes a new method of generalized Hamiltonian realization called the orthogonal decomposition method, and gives the dissipative realization form of passive systems. This paper has proved that an arbitrary system has an orthogonal decomposition realization and an arbitrary asymptotically stable system has a strict dissipative realization. Then this paper studies the feedback dissipative realization problem and proposes a control-switching method for the realization. Finally,this paper proposes several sufficient conditions for feedback dissipative realization.
Radiation emission as a virtually exact realization of Heisenbergs microscope
Andersen, K.K., E-mail: kka@phys.au.dk [Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C (Denmark); Brock, S. [Department of Culture and Society, Aarhus University, Jens Chr. Skous Vej 5, 8000 Aarhus C (Denmark); Esberg, J.; Thomsen, H.D.; Uggerhøj, U.I. [Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C (Denmark)
2013-11-15
Through the concept of ‘formation length’, recently observed directly in the radiation emission from ultrarelativistic electrons and an essential component in the interpretation of strong field radiation from electrons penetrating single crystals, we discuss the indeterminacy in the location of radiation emission. The analogy with the indeterminacy in the Heisenberg microscope Gedanken experiment is demonstrated from a number of viewpoints to be almost exact. The positive attitude regarding photon emission as a process that is somehow located in space and time is emphasized. We therefore interpret the measurements of formation lengths in radiation emission as a practically realizable version – using virtual incident photons instead of real – of the Heisenberg microscope Gedanken experiment.
Level Shifts in Volatility and the Implied-Realized Volatility Relation
Christensen, Bent Jesper; de Magistris, Paolo Santucci
to the multivariate case of the univariate level shift technique by Lu and Perron (2008). An application to the S&P500 index and a simulation experiment show that the recently documented empirical properties of strong persistence in volatility and forecastability of future realized volatility from current implied...... volatility, which have been interpreted as long memory (or fractional integration) in volatility and fractional cointegration between implied and realized volatility, are accounted for by occasional common level shifts....
WANG Shao-Kai; REN Ji-Gang; PENG Cheng-Zhi; JIANG Shuo; WANG Xiang-Bin
2007-01-01
We report a method to realize the arbitrary inverse unitary transformation imposed by a single-mode fibre on photon's polarization by the succession of two quarter-wave plates and a half-wave plate. The process of realization by polarization state vector. The method is meaningful in quantum communication experiment such as quantum teleportation, in which an unknown arbitrary quantum state should be kept to be unchanged in the case of using a single-mode fibre for time delay.
Palatal Morphology Can Influence Speaker-Specific Realizations of Phonemic Contrasts
Weirich, Melanie; Fuchs, Susanne
2013-01-01
Purpose: The purpose of this study was to further explore the understanding of speaker-specific realizations of the /s/--/?/ contrast in German in relation to individual differences in palate shape. Method: Two articulatory experiments were carried out with German native speakers. In the first experiment, 4 monozygotic and 2 dizygotic twin pairs…
王佳成; 姚磊; 梅军; 郑建勇; 于泳
2013-01-01
Introduction was made to the construction of short-circuit experiment platform for the superconducting fault current limiter and its work mode and principle. This paper gave the call process of the experimental data collected from the lower machine DSP to PC’s VB program. The short-circuit experiment of magnesium diboride superconducting fault current limiter was conducted under the conditions of liquid nitrogen. The experiment results show that the platform could correctly relfect the voltages at two sides of large current generator and the superconducting coil currents and effectively measure the temperature variation of the superconducting coil, to lay the foundation for the continuous experiment under the conditions of liquid nitrogen.%介绍了超导限流器短路实验平台的搭建过程及其工作方式与原理，并给出实验数据从下位机DSP采集到上位机VB程序调用的过程。进行了二硼化镁超导限流器在液氮条件下的短路实验，实验结果表明该平台能正确反映大电流发生器两侧电压以及超导线圈电流，并有效测量超导线圈的温度变化，为后续液氦条件下的实验打下了基础。
Challenges in realizing ultraflat materials surfaces
Takashi Yatsui
2013-12-01
Full Text Available Ultraflat surface substrates are required to achieve an optimal performance of future optical, electronic, or optoelectronic devices for various applications, because such surfaces reduce the scattering loss of photons, electrons, or both at the surfaces and interfaces. In this paper, we review recent progress toward the realization of ultraflat materials surfaces. First, we review the development of surface-flattening techniques. Second, we briefly review the dressed photon–phonon (DPP, a nanometric quasiparticle that describes the coupled state of a photon, an electron, and a multimode-coherent phonon. Then, we review several recent developments based on DPP-photochemical etching and desorption processes, which have resulted in angstrom-scale flat surfaces. To confirm that the superior flatness of these surfaces that originated from the DPP process, we also review a simplified mathematical model that describes the scale-dependent effects of optical near-fields. Finally, we present the future outlook for these technologies.
Neuromorphic VLSI realization of the hippocampal formation.
Aggarwal, Anu
2016-05-01
The medial entorhinal cortex grid cells, aided by the subicular head direction cells, are thought to provide a matrix which is utilized by the hippocampal place cells for calculation of position of an animal during spatial navigation. The place cells are thought to function as an internal GPS for the brain and provide a spatiotemporal stamp on episodic memories. Several computational neuroscience models have been proposed to explain the place specific firing patterns of the cells of the hippocampal formation - including the GRIDSmap model for grid cells and Bayesian integration for place cells. In this work, we present design and measurement results from a first ever system of silicon circuits which successfully realize the function of the hippocampal formation of brain based on these models.
Discrete Time Crystals: Rigidity, Criticality, and Realizations
Yao, N. Y.; Potter, A. C.; Potirniche, I.-D.; Vishwanath, A.
2017-01-01
Despite being forbidden in equilibrium, spontaneous breaking of time translation symmetry can occur in periodically driven, Floquet systems with discrete time-translation symmetry. The period of the resulting discrete time crystal is quantized to an integer multiple of the drive period, arising from a combination of collective synchronization and many body localization. Here, we consider a simple model for a one-dimensional discrete time crystal which explicitly reveals the rigidity of the emergent oscillations as the drive is varied. We numerically map out its phase diagram and compute the properties of the dynamical phase transition where the time crystal melts into a trivial Floquet insulator. Moreover, we demonstrate that the model can be realized with current experimental technologies and propose a blueprint based upon a one dimensional chain of trapped ions. Using experimental parameters (featuring long-range interactions), we identify the phase boundaries of the ion-time-crystal and propose a measurable signature of the symmetry breaking phase transition.
On the Realization of the Dynamics Relativity
Li, C Y C K
2005-01-01
The realization of the relativity of physical laws is discussed in this paper. First, we propose a kind of new relativity, that is the gravitational interaction survey actually may for the observation of any local region is relative. Moreover, the equivalence of such a relativity with the kinematic quantity further lead to the same mathematical form of gravity theory as Einstein's field equation. Secondly, inertial reference frames can be naturally established resorting to "the minimal-gravity-free observer", which is defined to apply the "law of inertia" locally. Therefore, dynamical equations would be form-invariant only to such inertial reference frames at different levels. In the spirit of such a $moderate$ $relativity$, the metric of the gravity-geometrized space-time in the cosmological observation theory should be rewritten. We introduce two geometrical variables $\\{b(t),a(t)\\}$ into the cosmological metric according to the varying gravity in the universe, for $b(t)$ is the gravitational time dilation ...
Realization of Green MOT for Ytterbium Atoms
ZHAO Peng-Yi; XIONG Zhuan-Xian; LONG Yun; HE Ling-Xiang; L(U) Bao-Long
2009-01-01
We report the experimental realization of a magneto-optical trap (MOT) of 174Yb atoms operating on the 1S0-3p1 intercombination transition at 555.8 nm.The green MOT is loaded by a Zeeman-slowed atomic beam.In order to increase the capture velocity of the MOT,we use the trapping laser beams consisting of five discrete frequency components obtained by modulating the laser light through an electro-optic modulator.The trapped atomic number of the 174 Yb isotope is about 6.2×105,and the temperature of the cold atowic cloud is estimated to be about 100 μK.The success of the green MOT is an important step towards the goad of an ytterbium optical dock.
Another Way To Realize Maxwell's Demon
Fu, X; Fu, Xinyong; Fu, Zitao
2005-01-01
This is another approach to realize Maxwell's demon hypothesis. Two Ag-O-Cs thermal electron ejectors, A and B, are settled in a vacuum tube. A non-uniform magnetic field exerted on the tube provides a one-way channel for the thermal electrons. Ejector A, losing electrons, charges positively, while ejector B, getting electrons, charges negatively, resulting in an electric voltage. In flying from A to B, the speed of the electrons decreases, and part of their thermal kinetic energy converts into electric potential energy. Thus, the temperature of the whole electron tube drops down slightly, and that can be compensated by the heat attracted from the ambient air. The device can provide a small but macroscopic power to an external load, violating Kelvin's statement of the second law.
Lattice Theories with Nonlinearly Realized Chiral Symmetry
Chandrasekharan, S; Steffen, F D; Wiese, U J
2003-01-01
We present the lattice formulation of effective Lagrangians in which chiral symmetry is realized nonlinearly on the fermion fields. In this framework both the Wilson term removing unphysical doubler fermions and the fermion mass term do not break chiral symmetry. Our lattice formulation allows us to address non-perturbative questions in effective theories of baryons interacting with pions and in models involving constitutent quarks interacting with pions and gluons. With the presented methods, a system containing a non-zero density of static baryons interacting with pions can be studied on the lattice without encountering a complex action problem. This might lead to new insights into the phase diagram of strongly interacting matter at non-zero chemical potential.
Discrete Time Crystals: Rigidity, Criticality, and Realizations.
Yao, N Y; Potter, A C; Potirniche, I-D; Vishwanath, A
2017-01-20
Despite being forbidden in equilibrium, spontaneous breaking of time translation symmetry can occur in periodically driven, Floquet systems with discrete time-translation symmetry. The period of the resulting discrete time crystal is quantized to an integer multiple of the drive period, arising from a combination of collective synchronization and many body localization. Here, we consider a simple model for a one-dimensional discrete time crystal which explicitly reveals the rigidity of the emergent oscillations as the drive is varied. We numerically map out its phase diagram and compute the properties of the dynamical phase transition where the time crystal melts into a trivial Floquet insulator. Moreover, we demonstrate that the model can be realized with current experimental technologies and propose a blueprint based upon a one dimensional chain of trapped ions. Using experimental parameters (featuring long-range interactions), we identify the phase boundaries of the ion-time-crystal and propose a measurable signature of the symmetry breaking phase transition.
Realized Variance and Market Microstructure Noise
Hansen, Peter R.; Lunde, Asger
2006-01-01
We study market microstructure noise in high-frequency data and analyze its implications for the realized variance (RV) under a general specification for the noise. We show that kernel-based estimators can unearth important characteristics of market microstructure noise and that a simple kernel......-based estimator dominates the RV for the estimation of integrated variance (IV). An empirical analysis of the Dow Jones Industrial Average stocks reveals that market microstructure noise its time-dependent and correlated with increments in the efficient price. This has important implications for volatility...... estimation based on high-frequency data. Finally, we apply cointegration techniques to decompose transaction prices and bid-ask quotes into an estimate of the efficient price and noise. This framework enables us to study the dynamic effects on transaction prices and quotes caused by changes in the efficient...
Topological Insulator Realized with Piezoelectric Resonators
McHugh, S.
2016-07-01
We propose a realization of a two-dimensional topological insulator using an array of microwave piezoelectric resonators. The resonators are coupled electrically, but acoustically isolated. The inter-resonator electromagnetic coupling required to reproduce an effective mechanical topological insulator is found explicitly. Both the acoustic and electric response show the essential features of topological insulator, e.g., helical edge states. The helical edge states may be useful for engineering nonreciprocal electronic devices like isolators and circulators. These components do not often appear in the radios of modern mobile phones since they traditionally require bulky magnetic material. However, a nonreciprocal device based on piezoelectric resonators may meet the demands of phone manufacturers due to their small size, high-linearity, and ease of fabrication.
Realization of allowable qeneralized quantum gates
无
2010-01-01
The most general duality gates were introduced by Long,Liu and Wang and named allowable generalized quantum gates (AGQGs,for short).By definition,an allowable generalized quantum gate has the form of U=YfkjsckUK,where Uk’s are unitary operators on a Hilbert space H and the coefficients ck’s are complex numbers with |Yfijo ck\\ ∧ 1 an d 1ck| <1 for all k=0,1,...,d-1.In this paper,we prove that an AGQG U=YfkZo ck∧k is realizable,i.e.there are two d by d unitary matrices W and V such that ck=W0kVk0 (0
New Realization of Periodic Cycled Separation
Toftegard, Bjarne; Clausen, Charlotte H.; Jørgensen, Sten B.;
2016-01-01
A new realization of periodic cycled gas/liquid separation is presented. Separation factors and column efficiencies are compared for a column stripping ammonia from water with air, using three different sets of internals: conventional sieve trays, Sulzer BX gauze packings, and periodically cycled...... trays. The proposed new periodic trays are shown to be advantageous compared to their continuous alternatives. It is demonstrated experimentally that periodic tray efficiencies of up to 300% are achievable. With the proposed new tray design, a new operation form is also introduced in which the trays...... are drained sequentially rather than simultaneously, such that the vapor flow is not interrupted during the liquid drainage. For different ratios of counter-current vapor/liquid flow rates, column efficiencies for periodically cycled columns are shown experimentally to be two times greater than those...
Realize Tarim Oilfield Take-off
无
2007-01-01
@@ PetroChina Tarim Oilfield Company, former Tarim Petroleum Exploration & Development Bureau founded in April 1989, is one of the regional subsidiaries under PetroChina Company Limited (PetroChina). It is a large-scale oil company integrated in petroleum exploration and development, oil refining, production of petrochemicals, technological study and marketing business. Headquartered on the bank of Peacock River in Korle City of Xinjiang Uygur Autonomous Region, the company operates itself in more than 20 counties of five prefectures around Tarim Basin. It has since its foundation adhered to the principles of "adopting new management system and new technology, as well as realizing high-grade and high-efficiency battle for oil", implemented market operation, contract management,professional service, and socialization dependence.
String theory realizations of the nilpotent goldstino
Kallosh, Renata; Quevedo, Fernando; Uranga, Angel M.
2015-12-01
We describe in detail how the spectrum of a single anti-D3-brane in four-dimensional orientifolded IIB string models reproduces precisely the field content of a nilpotent chiral superfield with the only physical component corresponding to the fermionic goldstino. In particular we explicitly consider a single anti-D3-brane on top of an O3-plane in warped throats, induced by (2, 1) fluxes. More general systems including several anti-branes and other orientifold planes are also discussed. This provides further evidence to the claim that non-linearly realized supersymmetry due to the presence of antibranes in string theory can be described by supersymmetric theories including nilpotent superfields. Implications to the KKLT and related scenarios of de Sitter moduli stabilization, to cosmology and to the structure of soft SUSY-breaking terms are briefly discussed.
String theory realizations of the nilpotent goldstino
Kallosh, Renata [Department of Physics and SITP, Stanford University, Stanford, CA 94305 (United States); Quevedo, Fernando [ICTP, Strada Costiera 11, 34151 Trieste (Italy); DAMTP, CMS, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA (United Kingdom); Uranga, Angel M. [Instituto de Física Teórica UAM-CSIC, c/ Nicolás Cabrera 13-15, 28049 Madrid (Spain)
2015-12-09
We describe in detail how the spectrum of a single anti-D3-brane in four-dimensional orientifolded IIB string models reproduces precisely the field content of a nilpotent chiral superfield with the only physical component corresponding to the fermionic goldstino. In particular we explicitly consider a single anti-D3-brane on top of an O3-plane in warped throats, induced by (2,1) fluxes. More general systems including several anti-branes and other orientifold planes are also discussed. This provides further evidence to the claim that non-linearly realized supersymmetry due to the presence of antibranes in string theory can be described by supersymmetric theories including nilpotent superfields. Implications to the KKLT and related scenarios of de Sitter moduli stabilization, to cosmology and to the structure of soft SUSY-breaking terms are briefly discussed.
Realized Variance and Market Microstructure Noise
Hansen, Peter R.; Lunde, Asger
2006-01-01
We study market microstructure noise in high-frequency data and analyze its implications for the realized variance (RV) under a general specification for the noise. We show that kernel-based estimators can unearth important characteristics of market microstructure noise and that a simple kernel......-based estimator dominates the RV for the estimation of integrated variance (IV). An empirical analysis of the Dow Jones Industrial Average stocks reveals that market microstructure noise its time-dependent and correlated with increments in the efficient price. This has important implications for volatility...... estimation based on high-frequency data. Finally, we apply cointegration techniques to decompose transaction prices and bid-ask quotes into an estimate of the efficient price and noise. This framework enables us to study the dynamic effects on transaction prices and quotes caused by changes in the efficient...
Robust paths to realize nonadiabatic holonomic gates
Xu, G. F.; Zhao, P. Z.; Tong, D. M.; Sjöqvist, Erik
2017-05-01
To realize one desired nonadiabatic holonomic gate, various equivalent evolution paths can be chosen. However, in the presence of errors, these paths become inequivalent. In this paper we investigate the difference of these evolution paths in the presence of systematic Rabi-frequency errors and aim to find paths with optimal robustness to realize one-qubit nonadiabatic holonomic gates. We focus on three types of evolution paths in the Λ system: paths belonging to the original two-loop scheme [E. Sjöqvist et al., New J. Phys. 14, 103035 (2012), 10.1088/1367-2630/14/10/103035], the single-loop multiple-pulse scheme [E. Herterich and E. Sjöqvist, Phys. Rev. A 94, 052310 (2016), 10.1103/PhysRevA.94.052310], and the off-resonance single-shot scheme [G. F. Xu et al., Phys. Rev. Lett. 92, 052302 (2015), 10.1103/PhysRevLett.92.052302; E. Sjöqvist, Phys. Lett. A 380, 65 (2016), 10.1016/j.physleta.2015.10.006]. Whereas both the single-loop multiple-pulse and single-shot schemes aim to improve the robustness of the original two-loop scheme by shortening the exposure to decoherence, we find here that the two-loop scheme is more robust to systematic errors in the Rabi frequencies. More importantly, we derive conditions under which the resilience to this kind of error can be optimized, thereby strengthening the robustness of nonadiabatic holonomic gates.
Towards scalable quantum communication and computation: Novel approaches and realizations
Jiang, Liang
Quantum information science involves exploration of fundamental laws of quantum mechanics for information processing tasks. This thesis presents several new approaches towards scalable quantum information processing. First, we consider a hybrid approach to scalable quantum computation, based on an optically connected network of few-qubit quantum registers. Specifically, we develop a novel scheme for scalable quantum computation that is robust against various imperfections. To justify that nitrogen-vacancy (NV) color centers in diamond can be a promising realization of the few-qubit quantum register, we show how to isolate a few proximal nuclear spins from the rest of the environment and use them for the quantum register. We also demonstrate experimentally that the nuclear spin coherence is only weakly perturbed under optical illumination, which allows us to implement quantum logical operations that use the nuclear spins to assist the repetitive-readout of the electronic spin. Using this technique, we demonstrate more than two-fold improvement in signal-to-noise ratio. Apart from direct application to enhance the sensitivity of the NV-based nano-magnetometer, this experiment represents an important step towards the realization of robust quantum information processors using electronic and nuclear spin qubits. We then study realizations of quantum repeaters for long distance quantum communication. Specifically, we develop an efficient scheme for quantum repeaters based on atomic ensembles. We use dynamic programming to optimize various quantum repeater protocols. In addition, we propose a new protocol of quantum repeater with encoding, which efficiently uses local resources (about 100 qubits) to identify and correct errors, to achieve fast one-way quantum communication over long distances. Finally, we explore quantum systems with topological order. Such systems can exhibit remarkable phenomena such as quasiparticles with anyonic statistics and have been proposed as
薛飞; 杜江峰; 石名俊; 周先意; 韩荣典; 吴季辉
2002-01-01
We have experimentally realized the Fredkin gate with only three transition pulses in a solution of alanine. It appears that no experimental realization of the Fredkin gate with fewer pulses has been reported yet. In addition,the simple structure of our scheme makes it easy to implement in experiments.
On the connectivity of the realization spaces of line arrangements
Nazir, Shaheen
2010-01-01
We prove that under certain combinatorial conditions, the realization spaces of line arrangements on the complex projective plane are connected. We also give several examples of arrangements with eight, nine and ten lines which have disconnected realization spaces.
Optical-fiber distributed temperature sensor: design and realization
MENG Ling; JIANG Mingshun; SUI Qing-mei; FENG De-jun
2008-01-01
Through analyzing theoretically the temperature effect of the optical-fiber Raman backscattering, a distributed temperaturesensor is designed based on the single-mode fiber. Demodulation methods of temperature transduction are compared, andthen the demodulation method using the ratio of the anti-Stokes and the Stokes Raman backscattering intensity is adopted.Both the hardware composition and the software realization of the system are introduced in detail.The experiment showsthat the distinguishing ability of the temperature and that of the space are 1℃ and 2 m, respectively, and that the systemresponse time is about 180 s with a sensing range of 5 km and with a temperature measurement range of 0-100℃.
Pedagogical Dramas and Transformational Play: Realizing Narrative through Videogames Design
Barab, Sasha A.; Dodge, Tyler; Ingram-Goble, Adam; Volk, Charlene; Peppler, Kylie; Pettyjohn, Patrick; Solomou, Maria
Whereas traditionally stories involve an author, a performer, and an audience, much of the power of videogames as media for advancing narrative springs from their affordance for the player to occupy more than one role—and sometimes all three—simultaneously. In the narratively-rich videogames that we design, players have the opportunity to perform actions, experience consequences, and reflect on the underlying social values that these situations were designed to engage. Here, our focus is on the use of these games to engage children in experiencing ideological struggles associated with realizing social commitments. Toward this end, we will present our theoretical argument for the power of games as a contemporary story medium, grounding this discussion in the demonstration of three game design projects and their implementations.
Realization of an efficient coherent combination via Michelson cavity
2007-01-01
An intracavity coherent coupling Michelson erbium-doped fibre (EDF) laser (MCEDFL) is proposed and demonstrated. By using this laser system, we find a means to obtain a maximum power output at the same pumping power level. From the experiment based on fibre Bragg gratings (FBGs) with different reflectivities from 6% to 100%, we find that the reflectivity of the FBG plays a vital role in improving the performance of the MCEDFL. At the same time, the MCEDFL with a polarizer can be coherently combined effectively. This type of system, in principle, is compatible with other more powerful pumping methods, such as cladding pumping, and brings some novel perspectives to the realization of high power lasers.
Experimental Realization of a Reflective Optical Limiter
Vella, Jarrett H; Browning, Andrew T; Limberopoulos, Nicholaos I; Vitebskiy, Ilya; Makri, Eleana; Kottos, Tsampikos
2015-01-01
Optical limiters transmit low-intensity light, while blocking laser radiation with excessively high intensity or fluence. A typical passive optical limiter absorbs most of the high level radiation, which can cause irreversible damage. In this communication we report the first experimental realization of a reflective optical limiter, which does not absorb the high-level laser radiation, but rather reflects it back to space. The design is based on a periodic layered structure composed of alternating SiO2 and Si3N4 layers with a single GaAs defect layer in the middle. At low intensities, the layered structure displays a strong resonant transmission via the localized defect mode. At high intensities, the two-photon absorption in the GaAs layer suppresses the localized mode along with the resonant transmission, the entire layered structure turns highly reflective within a broad frequency range covering the entire photonic band gap of the periodic layered structure. By contrast, a stand-alone GaAs layer would absor...
Efficient Realization of BCD Multipliers Using FPGAs
Shuli Gao
2017-01-01
Full Text Available In this paper, a novel BCD multiplier approach is proposed. The main highlight of the proposed architecture is the generation of the partial products and parallel binary operations based on 2-digit columns. 1 × 1-digit multipliers used for the partial product generation are implemented directly by 4-bit binary multipliers without any code conversion. The binary results of the 1 × 1-digit multiplications are organized according to their two-digit positions to generate the 2-digit column-based partial products. A binary-decimal compressor structure is developed and used for partial product reduction. These reduced partial products are added in optimized 6-LUT BCD adders. The parallel binary operations and the improved BCD addition result in improved performance and reduced resource usage. The proposed approach was implemented on Xilinx Virtex-5 and Virtex-6 FPGAs with emphasis on the critical path delay reduction. Pipelined BCD multipliers were implemented for 4 × 4, 8 × 8, and 16 × 16-digit multipliers. Our realizations achieve an increase in speed by up to 22% and a reduction of LUT count by up to 14% over previously reported results.
The impact of voice on speech realization
Jelka Breznik
2014-12-01
Full Text Available The study discusses spoken literary language and the impact of voice on speech realization. The voice consists of a sound made by a human being using the vocal folds for talking, singing, laughing, crying, screaming… The human voice is specifically the part of human sound production in which the vocal folds (vocal cords are the primary sound source. Our voice is our instrument and identity card. How does the voice (voice tone affect others and how do they respond, positively or negatively? How important is voice (voice tone in communication process? The study presents how certain individuals perceive voice. The results of the research on the relationships between the spoken word, excellent speaker, voice and description / definition / identification of specific voices done by experts in the field of speech and voice as well as non-professionals are presented. The study encompasses two focus groups. One consists of amateurs (non-specialists in the field of speech or voice who have no knowledge in this field and the other consists of professionals who work with speech or language or voice. The questions were intensified from general to specific, directly related to the topic. The purpose of such a method of questioning was to create relaxed atmosphere, promote discussion, allow participants to interact, complement, and to set up self-listening and additional comments.
Worldsheet realization of the refined topological string
Antoniadis, I., E-mail: ignatios.antoniadis@cern.ch [Department of Physics, CERN – Theory Division, CH-1211 Geneva 23 (Switzerland); Florakis, I., E-mail: florakis@mppmu.mpg.de [Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, 80805 München (Germany); Hohenegger, S., E-mail: stefan.hohenegger@cern.ch [Department of Physics, CERN – Theory Division, CH-1211 Geneva 23 (Switzerland); Narain, K.S., E-mail: narain@ictp.trieste.it [High Energy Section, The Abdus Salam International Center for Theoretical Physics, Strada Costiera, 11-34014 Trieste (Italy); Zein Assi, A., E-mail: zeinassi@cern.ch [Department of Physics, CERN – Theory Division, CH-1211 Geneva 23 (Switzerland); Centre de Physique Théorique (UMR CNRS 7644), Ecole Polytechnique, 91128 Palaiseau (France)
2013-10-01
A worldsheet realization of the refined topological string is proposed in terms of physical string amplitudes that compute generalized N=2 F-terms of the form F{sub g,n}W{sup 2g}ϒ{sup 2n} in the effective supergravity action. These terms involve the chiral Weyl superfield W and a superfield ϒ defined as an N=2 chiral projection of a particular anti-chiral T{sup ¯}-vector multiplet. In Heterotic and Type I theories, obtained upon compactification on the six-dimensional manifold K3×T{sup 2}, T is the usual Kähler modulus of the T{sup 2} torus. These amplitudes are computed exactly at the one-loop level in string theory. They are shown to reproduce the correct perturbative part of the Nekrasov partition function in the field theory limit when expanded around an SU(2) enhancement point of the string moduli space. The two deformation parameters ϵ{sub −} and ϵ{sub +} of the Ω supergravity background are then identified with the constant field strength backgrounds for the anti-self-dual graviphoton and self-dual gauge field of the T{sup ¯} vector multiplet, respectively.
Neutrino factories: realization and physics potential
Geer, S.; /Fermilab; Zisman, M.S.; /LBL, Berkeley
2006-12-01
Neutrino Factories offer an exciting option for the long-term neutrino physics program. This new type of neutrino facility will provide beams with unique properties. Low systematic uncertainties at a Neutrino Factory, together with a unique and precisely known neutrino flavor content, will enable neutrino oscillation measurements to be made with unprecedented sensitivity and precision. Over recent years, the resulting neutrino factory physics potential has been discussed extensively in the literature. In addition, over the last six years the R&D necessary to realize a Neutrino Factory has been progressing, and has developed into a significant international activity. It is expected that, within about five more years, the initial phase of this R&D program will be complete and, if the community chooses to build this new type of neutrino source within the following decade, neutrino factory technology will be ready for the final R&D phase prior to construction. In this paper (1) an overview is given of the technical ingredients needed for a Neutrino Factory, (2) beam properties are described, (3) the resulting neutrino oscillation physics potential is summarized, (4) a more detailed description is given for one representative Neutrino Factory design, and (5) the ongoing R&D program is summarized, and future plans briefly described.
Realizing the promise of breast cancer vaccines
Jackson E
2012-08-01
Full Text Available Erica Jackson, Hatem SolimanUniversity of South Florida/Moffitt Cancer Center and Research Institute, Tampa, FL, USAAbstract: Breast cancer vaccines are being developed to stimulate adaptive antitumor immune responses in patients. These vaccines have the potential to treat breast cancer with minimal side effects and toxicity. However, many obstacles still need to be overcome to fully realize the vaccines' clinical benefit. A review of the literature was conducted to assess the use of vaccines in targeting transformed cells. Four vaccines currently under study were discussed, each summarizing the different vaccine platforms used to introduce target antigen to the patient's immune system. The advantages and disadvantages of each method were discussed, although no one method was found to be superior. Additional issues addressed included overcoming tumor-induced immunosuppression, immune evasion of transformed cells, the use of vaccines in combination therapy, and the challenges of using these vaccines in various clinical settings. Vaccines may be most effective in patients with minimal residual disease, as opposed to using them in the metastatic setting. Also, specific clinical trial design considerations for the use of vaccines in cancer patients, such as time-to-failure end points, were discussed. Understanding these various elements will be important to the translation of breast cancer vaccine therapy into routine clinical practice.Keywords: breast cancer, vaccine, immunotherapy, immune tolerance, peptide vaccine, dendritic cell vaccine
Experimental Realization of a Reflective Optical Limiter
Vella, Jarrett H.; Goldsmith, John H.; Browning, Andrew T.; Limberopoulos, Nicholaos I.; Vitebskiy, Ilya; Makri, Eleana; Kottos, Tsampikos
2016-06-01
Optical limiters transmit low-intensity light, while blocking laser radiation with excessively high irradiance or fluence. A typical optical limiter involves a nonlinear material which is transparent at low light intensity and becomes opaque when the light intensity exceeds a certain level. Most of the high-level radiation is absorbed by the nonlinear material causing irreversible damage. This fundamental problem could be solved if the state of the nonlinear material changed from transparent to highly reflective (not absorptive) when the intensity becomes too high. None of the known nonlinear optical materials display such a property. A solution can be provided by a nonlinear photonic structure. In this communication, we report the experimental realization of a reflective optical limiter. The design is based on a planar microcavity composed of alternating SiO2 and Si3N4 layers with a single GaAs defect layer in the middle. At low intensity, the planar microcavity displays a strong resonant transmission via a cavity mode. As the intensity increases, two-photon absorption in GaAs kicks in, initially resulting in the microcavity-enhanced light absorption. A further increase in light intensity, though, suppresses the cavity mode along with the resonant transmission; the entire planar microcavity turns highly reflective within a broad frequency range covering the entire photonic band gap. This seemingly counterintuitive behavior is a general feature of resonant transmission via a cavity mode with purely nonlinear absorption.
Realization and performance of cryogenic selection mechanisms
Aitink-Kroes, Gabby; Bettonvil, Felix; Kragt, Jan; Elswijk, Eddy; Tromp, Niels
2014-07-01
Within Infra-Red large wavelength bandwidth instruments the use of mechanisms for selection of observation modes, filters, dispersing elements, pinholes or slits is inevitable. The cryogenic operating environment poses several challenges to these cryogenic mechanisms; like differential thermal shrinkage, physical property change of materials, limited use of lubrication, high feature density, limited space etc. MATISSE the mid-infrared interferometric spectrograph and imager for ESO's VLT interferometer (VLTI) at Paranal in Chile coherently combines the light from 4 telescopes. Within the Cold Optics Bench (COB) of MATISSE two concepts of selection mechanisms can be distinguished based on the same design principles: linear selection mechanisms (sliders) and rotating selection mechanisms (wheels).Both sliders and wheels are used at a temperature of 38 Kelvin. The selection mechanisms have to provide high accuracy and repeatability. The sliders/wheels have integrated tracks that run on small, accurately located, spring loaded precision bearings. Special indents are used for selection of the slider/wheel position. For maximum accuracy/repeatability the guiding/selection system is separated from the actuation in this case a cryogenic actuator inside the cryostat. The paper discusses the detailed design of the mechanisms and the final realization for the MATISSE COB. Limited lifetime and performance tests determine accuracy, warm and cold and the reliability/wear during life of the instrument. The test results and further improvements to the mechanisms are discussed.
On the RS2 realization of unparticles
Friedland, Alexander; Graesser, Michael
2009-01-01
To facilitate the study of the unparticle scenario it is very desirable to have a treatable model realizing it in four dimensions. Motivated by the general idea of the AdS/CFT correspondence, we consider a simple construction: the Randall-Sundrum 2 (single brane) setup with the Standard Model fields on the brane and a massive vector field in the warped bulk. We show that in this model the known properties of vector unparticles -- the nontrivial phase of the CFT propagator, the necessity and dominance of contact interactions, the unitarity constraint on the conformal dimension of the operator, and the tensor structure dictated by conformal symmetry -- follow by simple inspection of the brane-to-brane propagator. The phase has a physical interpretation as controlling the rate of escape of unparticles into the extra dimension. Requiring the correct sign for the imaginary part of the longitudinal polarization of the propagator, we obtain the flat-space unitarity condition m_5^2 > = 0. This condition carries uncha...
The Semantic Web: From Representation to Realization
Thórisson, Kristinn R.; Spivack, Nova; Wissner, James M.
A semantically-linked web of electronic information - the Semantic Web - promises numerous benefits including increased precision in automated information sorting, searching, organizing and summarizing. Realizing this requires significantly more reliable meta-information than is readily available today. It also requires a better way to represent information that supports unified management of diverse data and diverse Manipulation methods: from basic keywords to various types of artificial intelligence, to the highest level of intelligent manipulation - the human mind. How this is best done is far from obvious. Relying solely on hand-crafted annotation and ontologies, or solely on artificial intelligence techniques, seems less likely for success than a combination of the two. In this paper describe an integrated, complete solution to these challenges that has already been implemented and tested with hundreds of thousands of users. It is based on an ontological representational level we call SemCards that combines ontological rigour with flexible user interface constructs. SemCards are machine- and human-readable digital entities that allow non-experts to create and use semantic content, while empowering machines to better assist and participate in the process. SemCards enable users to easily create semantically-grounded data that in turn acts as examples for automation processes, creating a positive iterative feedback loop of metadata creation and refinement between user and machine. They provide a holistic solution to the Semantic Web, supporting powerful management of the full lifecycle of data, including its creation, retrieval, classification, sorting and sharing. We have implemented the SemCard technology on the semantic Web site Twine.com, showing that the technology is indeed versatile and scalable. Here we present the key ideas behind SemCards and describe the initial implementation of the technology.
Experimental realization of quantum random number generator
Soubusta, Jan; Haderka, Ondrej; Hendrych, Martin; Pavlicek, Pavel
2003-11-01
We present our experimental realization of a quantum random number generator (RNG) based on the quantum random process of division of light pulse on a fiber coupler. Our prototype consists of fiber optics elements: a pigtailcd laser diode, two mechanical attenuators, a fiber coupler, and two single photon detectors. The RNG contains all necessary electronics for the generation of light pulses, synchronized reading of detectors' states, processing of these results, and transfer of data to a host computer. The connection to the computer is done via a 25-pin parallel port, that makes our device easy to use with any personal computer (PC). The RNG can be operated in four different modes, that arc selected by the PC. The zeroth mode is just for the device control, the first mode serves for appropriate setting of generation efficiency, the second mode is designed for raw data sequence generation at a rate of 114 kByte/s, and the last mode provides balanced data sequence at a rate of 28 kByte/s utilizing von Ncumann's extraction procedure. This procedure is used to gain a properly balanced ratio between '0's and '1's. The balanced data sequence generated by the RNG in the third mode passes all kinds of tests we arc using [for example 15 tests proposed by G. Marsaglia, WWW: http://stat.fsu.edu/ geo/diehard.html 1. The raw data sequence can be used for purposes that do not need properly balanced data, because raw data passes tests that arc not inspecting the sequence balance.
Realizing e-government benefits with minimal capabilities
Pedersen, Keld
2017-01-01
that are not dealt with by existing literature were identified: 1) Benefits realization requires not just organizational capabilities, but also inter-organizational capabilities, 2) Coordination of benefits realization across organizational units, local and central government and across internal organizational...... levels is both essential and very challenging, 3) Managing benefits realization include much more than integrating benefits realization practices in IT projects, 4) Different benefits realization practices are needed at central government level, local management level and case worker level, 5) Different...... but to fully automate processes the reliance on formal benefits realization practices is decreased. Research limitations/implications — The findings are based on single case. Originality/value — There is only little empirical research studying benefits realization in a public sector context. Furthermore...
Proton Irradiations on SJ HV Power MOSFETs to Realize Fast Diode Devices
Ignazio Bertuglia
2014-01-01
Full Text Available This paper studies the effects of proton irradiations on Super Junction High Voltage power MOSFETs to realize transistors with fast diode. Experiments were performed on a sample of 600 V power MOSFETs and achieved results were compared to standard irradiated devices by electrons.
The realization problem for positive and fractional systems
Kaczorek, Tadeusz
2014-01-01
This book addresses the realization problem of positive and fractional continuous-time and discrete-time linear systems. Roughly speaking the essence of the realization problem can be stated as follows: Find the matrices of the state space equations of linear systems for given their transfer matrices. This first book on this topic shows how many well-known classical approaches have been extended to the new classes of positive and fractional linear systems. The modified Gilbert method for multi-input multi-output linear systems, the method for determination of realizations in the controller canonical forms and in observer canonical forms are presented. The realization problem for linear systems described by differential operators, the realization problem in the Weierstrass canonical forms and of the descriptor linear systems for given Markov parameters are addressed. The book also presents a method for the determination of minimal realizations of descriptor linear systems and an extension for cone linear syste...
The Realization and Study of Optical Wings
Artusio-Glimpse, Alexandra Brae
Consider the airfoil: a carefully designed structure capable of stable lift in a uniform air flow. It so happens that air pressure and radiation (light) pressure are similar phenomena because each transfer momentum to flow-disturbing objects. This, then, begs the question: does an optical analogue to the airfoil exist? Though an exceedingly small effect, scientists harness radiation pressure in a wide gamut of applications from micromanipulation of single biological particles to the propulsion of large spacecrafts called solar sails. We introduce a cambered, refractive rod that is subjected to optical forces analogous to those seen in aerodynamics, and I call this analogue the optical wing. Flight characteristics of optical wings are determined by wing shape and material in a uniform radiation field. Theory predicts the lift force and axial torque are functions of the wing's angle of attack with stable and unstable orientations. These structures can operate as intensity-dependent, parametrically driven oscillators. In two-dimensions, the wings exhibit bistability when analyzed in an accelerating frame. In three-dimensions, the motion of axially symmetric spinning hemispherical wings is analogous to a spinning top. Experiments on semi-buoyant wings in water found semicylindrically shaped, refractive microparticles traversed a laser beam and rotated to an illumination-dependent stable orientation. Preliminary tests aid in the development of a calibrated force measurement experiment to directly evaluate the optical forces and torque on these samples. A foundational study of the optical wing, this work contributes to future advancements of flight-by-light.
The Realization of Mass Customization Using Modularization Method
无
2002-01-01
In the view of the comparison of Mass Customization ( MC) with Mass Production and Customization Production, the objectives of MC are analyzed. It is pointed out that the core objectives of MC are to realize in dividuation customization, low cost, quick response to market demands. The modul arization theory is simply introduced. Based on the characteristics of modular ization, the mechanism of realizing MC with modularization is analyzed. The in dividuation customization can be realized with the diffe...
REALIZATION OF QUICK-LOOK IMAGING FOR SPACEBORNE SAR BASED ON PARALLEL PROCESSING
Tang Zhi; Zhou Yinqing; Li Jingwen
2004-01-01
Large range cell migration is a severe challenge to imaging algorithm for spaceborne SAR. Based on design of Finite Impulse Response (FIR) filter and Range Doppler (RD) algorithm,a realization of quick-look imaging for large range cell migration is proposed. It realized quicklook imaging of 8 times reduced resolution with parallel processing on memory shared 8 CPU SGI server. According to simulation experiment, this quick-look imaging algorithm with parallel processing can image 16384× 16384 SAR raw data within 6 seconds. It reaches the requirement of real-time imaging.
Experimental realization of optimal asymmetric cloning and telecloning via partial teleportation
Zhao, Z; Zhou, X Q; Chen, Y A; Lu, C Y; Karlsson, A; Pan, J W; Zhao, Zhi; Zhang, An-Ning; Zhou, Xiao-Qi; Chen, Yu-Ao; Lu, Chao-Yang; Karlsson, Anders; Pan, Jian-Wei
2004-01-01
We report an experimental realization of both optimal asymmetric cloning and telecloning of single photons by making use of partial teleportation of an unknown state. In the experiment, we demonstrate that, conditioned on the success of partial teleportation of single photons, not only the optimal asymmetric cloning can be accomplished, but also one of two outputs can be transfered to a distant location, realizing the telecloning. The experimental results represented a novel way to achieve the quantum cloning and may have potential applications in the context of quantum cryptography.
Experimental realization of the analogy of quantum dense coding in classical optics
Yang, Zhenwei; Sun, Yifan; Li, Pengyun; Zhang, Xiong; Song, Xinbing, E-mail: zhangxd@bit.edu.cn, E-mail: songxinbing@bit.edu.cn; Zhang, Xiangdong, E-mail: zhangxd@bit.edu.cn, E-mail: songxinbing@bit.edu.cn [School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing (China)
2016-06-15
We report on the experimental realization of the analogy of quantum dense coding in classical optical communication using classical optical correlations. Compared to quantum dense coding that uses pairs of photons entangled in polarization, we find that the proposed design exhibits many advantages. Considering that it is convenient to realize in optical communication, the attainable channel capacity in the experiment for dense coding can reach 2 bits, which is higher than that of the usual quantum coding capacity (1.585 bits). This increased channel capacity has been proven experimentally by transmitting ASCII characters in 12 quaternary digitals instead of the usual 24 bits.
Recolonizing wolves influence the realized niche of resident cougars
Elbroch, L Mark; Lendrum, Patrick E; Newby, Jesse; Quigley, Howard; Thompson, Daniel J
2015-01-01
.... We tested for new competition between reintroduced wolves and resident cougars in the Southern Yellowstone Ecosystem to assess whether wolves might be impacting the realized niche of sympatric...
Realized Bond-Stock Correlation: Macroeconomic Announcement Effects
Christiansen, Charlotte; Ranaldo, Angelo
2005-01-01
We investigate the effects of macroeconomic announcements on the realized correlation between bond and stock returns. Our results deliver insights into the dominating drivers of bond-stock comovements. We find that it is not so much the surprise component of the announcement, but the mere fact...... that an announcement occurs that influences the realized bond-stock correlation. The impact of macroeconomic announcements varies across the business cycle. Announcement effects are highly dependent on the sign of the realized bond-stock correlation which has recently gone from positive to negative. Macroeconomic...... announcement effects on realized bond and stock volatilities are also investigated....
Realization of Two-Qutrit Quantum Gates with Control Pulses
ZHANG Jie; DI Yao-Min; WEI Hai-Rui
2009-01-01
We investigate the realization of 2-qutrit logic gate in a bipartite 3-level system with qusi-Ising interaction. On the basis of Caftan decomposition of matrices, the unitary matrices of 2-qutrit are factorized into products of a series of realizable matrices. It is equivalent to exerting a certain control field on the system, and the control goal is usually gained by a sequence of control pulses. The general discussion on the realization of 2-qutrit logic gate is made first, and then the realization of the ternary SWAP gate and the ternary gate are discussed specifically, and the sequences of control pulses and drift processes implementing these gates are given.
Green photonics realized by optical complex systems
Nanri, Hiroto; Sasaki, Wakao
2013-12-01
We have experimentally demonstrated a new smart grid model which can control DC electric power flow autonomously among individual homes, by using an optical self-organized node with optical non-linear characteristics, and these homes are assumed to be installed by distributed power supplies, and electric power storage devices, and also supposed to be supplied partly by the commercial electric power grid utilities. An electric power network is composed of nodes and devises called Power Gate Unit (PGU). The nodes have optical nonlinearity for self-organizing informations about surplus or shortage of electric power as to individual homes. The PGU is a distributing unit of actual electric power based on above informations of power surplus or shortage at each home. The PGU at each home is electrically connected to both the onsite power supplies and household load such as a solar panel, a DC motor, and a storage battery as well as the commercial electric power grid utilities. In this work, we composed our experimental self-organized DC power grid with above components and supposed the supplied maximum power from the commercial electric power grid utilities to be limited to 5V-0.5A. In this network, information about surplus or shortage of electric power will propagate through the nodes. In the experiments, surplus electric current 0.4A at a particular node was distributed toward a PGU of another node suffering from shortage of electric current. We also confirmed in the experiments and simulations that even when signal propagation path was disconnected accidentally the network could recover an optimized path. The present smart grid system we have attained may be applied by optical fiber link in the near future because our essential components controlling PGU, i.e. the nodes are electro-optical hybrid which are easily applicable to fiber optical link so as to control electric power transmission line.
Skerovic, V; Zarubica, V; Aleksic, M [Directorate of measures and precious metals, Optical radiation Metrology department, Mike Alasa 14, 11000 Belgrade (Serbia); Zekovic, L; Belca, I, E-mail: vladanskerovic@dmdm.r [Faculty of Physics, Department for Applied physics and metrology, Studentski trg 12-16, 11000 Belgrade (Serbia)
2010-10-15
Realization of the scale of spectral responsivity of the detectors in the Directorate of Measures and Precious Metals (DMDM) is based on silicon detectors traceable to LNE-INM. In order to realize the unit of spectral irradiance in the laboratory for photometry and radiometry of the Bureau of Measures and Precious Metals, the new method based on the calibration of the spectroradiometer by comparison with standard detector has been established. The development of the method included realization of the System of Spectral Comparisons (SSC), together with the detector spectral responsivity calibrations by means of a primary spectrophotometric system. The linearity testing and stray light analysis were preformed to characterize the spectroradiometer. Measurement of aperture diameter and calibration of transimpedance amplifier were part of the overall experiment. In this paper, the developed method is presented and measurement results with the associated measurement uncertainty budget are shown.
Pu, Y.-F.; Jiang, N.; Chang, W.; Yang, H.-X.; Li, C.; Duan, L.-M.
2017-05-01
To realize long-distance quantum communication and quantum network, it is required to have multiplexed quantum memory with many memory cells. Each memory cell needs to be individually addressable and independently accessible. Here we report an experiment that realizes a multiplexed DLCZ-type quantum memory with 225 individually accessible memory cells in a macroscopic atomic ensemble. As a key element for quantum repeaters, we demonstrate that entanglement with flying optical qubits can be stored into any neighboring memory cells and read out after a programmable time with high fidelity. Experimental realization of a multiplexed quantum memory with many individually accessible memory cells and programmable control of its addressing and readout makes an important step for its application in quantum information technology.
Pu, Y-F; Jiang, N.; Chang, W.; Yang, H-X; Li, C.; Duan, L-M
2017-01-01
To realize long-distance quantum communication and quantum network, it is required to have multiplexed quantum memory with many memory cells. Each memory cell needs to be individually addressable and independently accessible. Here we report an experiment that realizes a multiplexed DLCZ-type quantum memory with 225 individually accessible memory cells in a macroscopic atomic ensemble. As a key element for quantum repeaters, we demonstrate that entanglement with flying optical qubits can be stored into any neighboring memory cells and read out after a programmable time with high fidelity. Experimental realization of a multiplexed quantum memory with many individually accessible memory cells and programmable control of its addressing and readout makes an important step for its application in quantum information technology. PMID:28480891
Realizing and Detecting a Topological Insulator in the AIII Symmetry Class
Velasco, Carlos G.; Paredes, Belén
2017-09-01
Topological insulators in the AIII (chiral unitary) symmetry class lack experimental realization. Moreover, fractionalization in one-dimensional topological insulators has not been yet directly observed. Our work might open possibilities for both challenges. We propose a one-dimensional model realizing the AIII symmetry class which can be realized in current experiments with ultracold atomic gases. We further report on a distinctive property of topological edge modes in the AIII class: in contrast to those in the well-studied BDI (chiral orthogonal) class, they have nonzero momentum. Exploiting this feature we propose a path for the detection of fractionalization. A fermion added to an AIII system splits into two halves localized at opposite momenta, which can be detected by imaging the momentum distribution.
FIMP realization of the scotogenic model
Molinaro, Emiliano; Zapata, Oscar [Physik-Department T30d, Technische Universität München, James-Franck-Straße, 85748 Garching (Germany); Yaguna, Carlos E., E-mail: emiliano.molinaro@tum.de, E-mail: carlos.yaguna@uni-muenster.de, E-mail: ozapata@fisica.udea.edu.co [Institut für Theoretische Physik, Universität Münster, Wilhelm-Klemm-Straße 9, D-48149 Münster (Germany)
2014-07-01
The scotogenic model is one of the simplest scenarios for physics beyond the Standard Model that can account for neutrino masses and dark matter at the TeV scale. It contains another scalar doublet and three additional singlet fermions (N{sub i}), all odd under a Z{sub 2} symmetry. In this paper, we examine the possibility that the dark matter candidate, N{sub 1}, does not reach thermal equilibrium in the early Universe so that it behaves as a Feebly Interacting Massive Particle (FIMP). In that case, it is found that the freeze-in production of dark matter is entirely dominated by the decays of the odd scalars. We compute the resulting dark matter abundance and study its dependence with the parameters of the model. The freeze-in mechanism is shown to be able to account for the observed relic density over a wide range of dark matter masses, from the keV to the TeV scale. In addition to freeze-in, the N{sub 1} relic density receives a further contribution from the late decay of the next-to-lightest odd particle, which we also analyze. Finally, we consider the possibility that the dark matter particle is a WIMP but receives an extra contribution to its relic density from the decay of the FIMP (N{sub 1}). In this case, important signals at direct and indirect detection experiments are generally expected.
Analysis Economics of Realizing Mass Customization
WANG Jiuhe; XIA Yan; FANG Shufen
2006-01-01
This paper breaks through the old study pattern, emphasizing the important of economic analysis and put forward the analytic method. The paper compares mass customization to just-in-time, analyses the two facets which include production and distribution. The production facet is influence of the indirect cost, scale economy, experiences economy and dynamic alliance. The reduction of indirect cost is the innovation, which has special angle comparatively traditional economic analysis. There is gaming between satisfying customer special demand and deciding price. Mass customization emphasizes that customer must achieve to loyalty not only content without increasing extra service charge-faith in company and product. The paper sets forth the economics of scale economy and dynamic alliance to embody the extensive economy. In addition it is another innovation that this paper analyses the defects of mass customization to evaluate the economic risk. Through comparing the traditional production mode, demonstrating the implement feasibility in company. That is mass customization has less economic risk whether or not. So the analysis proposes the evidences of the way of enterprise production.
Exponential GARCH Modeling with Realized Measures of Volatility
Hansen, Peter Reinhard; Huang, Zhuo
returns and volatility. We apply the model to DJIA stocks and an exchange traded fund that tracks the S&P 500 index and find that specifications with multiple realized measures dominate those that rely on a single realized measure. The empirical analysis suggests some convenient simplifications...
Aspect-Oriented Change Realizations and Their Interaction
Vranić, Valentino; Menkyna, Radoslav; Bebjak, Michal
2009-01-01
With aspect-oriented programming, changes can be treated explicitly and directly at the programming language level. An approach to aspect-oriented change realization based on a two-level change type model is presented in this paper. In this approach, aspect-oriented change realizations are mainly...
Aspect-Oriented Change Realizations and Their Interaction
Vranić, Valentino; Menkyna, Radoslav; Bebjak, Michal
2009-01-01
With aspect-oriented programming, changes can be treated explicitly and directly at the programming language level. An approach to aspect-oriented change realization based on a two-level change type model is presented in this paper. In this approach, aspect-oriented change realizations are mainly...
Locally operating realizations of nonconnected transformation Lie groups
García-Prada, Oscar; del Olmo, Mariano A.; Santander, Mariano
1988-05-01
A systematic study of locally operating multiplier realizations of nonconnected Lie groups of transformations is presented that generalizes previous results on connected groups. The semilinear locally operating multiplier realizations of a nonconnected group G are those obtained through an induction process from the finite-dimensional semilinear representations of a given subgroup of a representation group Ḡ for G.
Constrained Superfields and Standard Realization of Nonlinear Supersymmetry
Luo, Hui; Zheng, Sibo
2009-01-01
A constrained superfield formalism has been proposed recently to analyze the low energy physics related to Goldstinos. We prove that this formalism can be reformulated in the language of standard realization of nonlinear supersymmetry. New relations have been uncovered in the standard realization of nonlinear supersymmetry.
A Generic Solution to Realize Public Verifiability of Signcryption
LEI Feiyu; CHEN Wen; CHEN Kefei
2006-01-01
Signcryption has been a rapidly emerging efficient approach to achieve authenticity and confidentiality within a logic single step. However, it is still a difficult problem to realize public verifiability of signcryption in an efficient and secure way. Here, we present a generic solution to realize public verifiability based on quadratic residue.
Hermitian realizations of κ-Minkowski space-time
Kovačević, Domagoj; Meljanac, Stjepan; Samsarov, Andjelo; Škoda, Zoran
2015-01-01
General realizations, star products and plane waves for κ-Minkowski space-time are considered. Systematic construction of general Hermitian realization is presented, with special emphasis on noncommutative plane waves and Hermitian star product. Few examples are elaborated and possible physical applications are mentioned.
Supernatural Horror in English Literature and Means of it Realization
Ella V. Nesterik
2014-11-01
Full Text Available This article deals with linguistic means realizing supernatural horror in the language of fiction. The research is based on the hypothesis that the category of supernatural/irreal horrible being a part of literary space is realized by means of this global textual category.
Supernatural Horror in English Literature and Means of it Realization
Ella V. Nesterik; Maiya A. Kazbekova
2014-01-01
This article deals with linguistic means realizing supernatural horror in the language of fiction. The research is based on the hypothesis that the category of supernatural/irreal horrible being a part of literary space is realized by means of this global textual category.
Realization of mid-infrared graphene hyperbolic metamaterials.
Chang, You-Chia; Liu, Che-Hung; Liu, Chang-Hua; Zhang, Siyuan; Marder, Seth R; Narimanov, Evgenii E; Zhong, Zhaohui; Norris, Theodore B
2016-02-04
While metal is the most common conducting constituent element in the fabrication of metamaterials, graphene provides another useful building block, that is, a truly two-dimensional conducting sheet whose conductivity can be controlled by doping. Here we report the experimental realization of a multilayer structure of alternating graphene and Al2O3 layers, a structure similar to the metal-dielectric multilayers commonly used in creating visible wavelength hyperbolic metamaterials. Chemical vapour deposited graphene rather than exfoliated or epitaxial graphene is used, because layer transfer methods are easily applied in fabrication. We employ a method of doping to increase the layer conductivity, and our analysis shows that the doped chemical vapour deposited graphene has good optical properties in the mid-infrared range. We therefore design the metamaterial for mid-infrared operation; our characterization with an infrared ellipsometer demonstrates that the metamaterial experiences an optical topological transition from elliptic to hyperbolic dispersion at a wavelength of 4.5 μm.
Realization of mid-infrared graphene hyperbolic metamaterials
Chang, You-Chia; Liu, Che-Hung; Liu, Chang-Hua; Zhang, Siyuan; Marder, Seth R.; Narimanov, Evgenii E.; Zhong, Zhaohui; Norris, Theodore B.
2016-02-01
While metal is the most common conducting constituent element in the fabrication of metamaterials, graphene provides another useful building block, that is, a truly two-dimensional conducting sheet whose conductivity can be controlled by doping. Here we report the experimental realization of a multilayer structure of alternating graphene and Al2O3 layers, a structure similar to the metal-dielectric multilayers commonly used in creating visible wavelength hyperbolic metamaterials. Chemical vapour deposited graphene rather than exfoliated or epitaxial graphene is used, because layer transfer methods are easily applied in fabrication. We employ a method of doping to increase the layer conductivity, and our analysis shows that the doped chemical vapour deposited graphene has good optical properties in the mid-infrared range. We therefore design the metamaterial for mid-infrared operation; our characterization with an infrared ellipsometer demonstrates that the metamaterial experiences an optical topological transition from elliptic to hyperbolic dispersion at a wavelength of 4.5 μm.
Experimental realization of extraordinary acoustic transmission using Helmholtz resonators
Brian C. Crow
2015-02-01
Full Text Available The phenomenon of extraordinary acoustic transmission through a solid barrier with an embedded Helmholtz resonator (HR is demonstrated. The Helmholtz resonator consists of an embedded cavity and two necks that protrude, one on each side of the barrier. Extraordinary transmission occurs for a narrow spectral range encompassing the resonant frequency of the Helmholtz resonator. We show that an amplitude transmission of 97.5% is achieved through a resonator whose neck creates an open area of 6.25% of the total barrier area. In addition to the enhanced transmission, we show that there is a smooth, continuous phase transition in the transmitted sound as a function of frequency. The frequency dependent phase transition is used to experimentally realize slow wave propagation for a narrow-band Gaussian wave packet centered at the maximum transmission frequency. The use of parallel pairs of Helmholtz resonators tuned to different resonant frequencies is experimentally explored as a means of increasing the transmission bandwidth. These experiments show that because of the phase transition, there is always a frequency between the two Helmholtz resonant frequencies at which destructive interference occurs whether the resonances are close or far apart. Finally, we explain how the phase transition associated with Helmholtz-resonator-mediated extraordinary acoustic transmission can be exploited to produce diffractive acoustic components including sub-wavelength thickness acoustic lenses.
Combinatorial realizations of crystals via torus actions on quiver varieties
Sam, Steven V
2012-01-01
Consider Kashiwara's crystal associated to a highest weight representation of a symmetric Kac--Moody algebra. There is a geometric realization of this object using Nakajima's quiver varieties. In many particular cases it can also be realized by elementary combinatorial methods. Here we propose a framework for extracting combinatorial realizations from the geometric picture: we construct certain torus actions on the quiver varieties and use Morse theory to index the irreducible components by connected components of the subvariety of torus fixed points. We then discuss the case of affine sl(n). There the fixed point components are just points, and are naturally indexed by multi-partitions. There is some choice in our construction, leading to a family of combinatorial realizations for each highest weight crystal. In the case of the crystal of the fundamental representation we recover a family of realizations which was recently constructed by Fayers. This gives a more conceptual proof of Fayers' result as well as...
Radix-3 Algorithm for Realization of Discrete Fourier Transform
M.Narayan Murty
2016-07-01
Full Text Available In this paper, a new radix-3 algorithm for realization of discrete Fourier transform (DFT of length N = 3m (m = 1, 2, 3,... is presented. The DFT of length N can be realized from three DFT sequences, each of length N/3. If the input signal has length N, direct calculation of DFT requires O (N 2 complex multiplications (4N 2 real multiplications and some additions. This radix-3 algorithm reduces the number of multiplications required for realizing DFT. For example, the number of complex multiplications required for realizing 9-point DFT using the proposed radix-3 algorithm is 60. Thus, saving in time can be achieved in the realization of proposed algorithm.
Experimental realization of universal geometric quantum gates with solid-state spins.
Zu, C; Wang, W-B; He, L; Zhang, W-G; Dai, C-Y; Wang, F; Duan, L-M
2014-10-02
Experimental realization of a universal set of quantum logic gates is the central requirement for the implementation of a quantum computer. In an 'all-geometric' approach to quantum computation, the quantum gates are implemented using Berry phases and their non-Abelian extensions, holonomies, from geometric transformation of quantum states in the Hilbert space. Apart from its fundamental interest and rich mathematical structure, the geometric approach has some built-in noise-resilience features. On the experimental side, geometric phases and holonomies have been observed in thermal ensembles of liquid molecules using nuclear magnetic resonance; however, such systems are known to be non-scalable for the purposes of quantum computing. There are proposals to implement geometric quantum computation in scalable experimental platforms such as trapped ions, superconducting quantum bits and quantum dots, and a recent experiment has realized geometric single-bit gates in a superconducting system. Here we report the experimental realization of a universal set of geometric quantum gates using the solid-state spins of diamond nitrogen-vacancy centres. These diamond defects provide a scalable experimental platform with the potential for room-temperature quantum computing, which has attracted strong interest in recent years. Our experiment shows that all-geometric and potentially robust quantum computation can be realized with solid-state spin quantum bits, making use of recent advances in the coherent control of this system.
Integrated Laser-Target Interaction Experiments on the RAL Petawatt Laser
Patel, P K; Key, M H; Mackinnon, A J; Berry, R; Borghesi, M; Chambers, D M; Chen, H; Clarke, R; Damian, C; Eagleton, R; Freeman, R; Glenzer, S; Gregori, G; Heathcote, R; Hey, D; Izumi, N; Kar, S; King, J; Nikroo, A; Niles, A; Park, H S; Pasley, J; Patel, N; Shepherd, R; Snavely, R A; Steinman, D; Stoeckl, C; Storm, M; Town, R; Van Maren, R; Theobald, W; Wilks, S C; Zhang, B
2006-10-11
Since the construction of the first Petawatt laser on the Nova laser facility at Lawrence Livermore National Laboratory we are witnessing the emergence of similar Petawatt-class laser systems at laboratories all around the world. This new generation of lasers, able to deliver several hundred joules of energy in a sub-picosecond pulse, has enabled a host of new discoveries to be made and continues to provide a valuable tool to explore new regimes in relativistic laser-plasma physics--encompassing high energy X-rays and -rays, relativistic electrons, intense ion beams, and superstrong magnetic fields. The coupling in the near-future of multi-kiloJoule Petawatt-class lasers with large-scale fusion lasers.including the NIF and Omega EP (US), LIL (France), and FIREX (Japan)--will further expand opportunities in fast ignition, high energy X-ray radiography, and high energy density physics research. The 500 J Petawatt laser at the Rutherford Appleton Laboratory is currently the highest energy short-pulse laser in the world. In this paper we describe a recent experimental campaign carried out on the facility. The campaign, performed by a large collaborative team from eight different laboratories, was designed to study a variety of relativistic laser-interaction phenomena including laser absorption, fast electron transport, proton heating, and high-brightness x-ray generation. The wide scope of the experiment necessitated the deployment of a very large set of diagnostics--in total twenty-five separate instruments. In order to obtain the most comprehensive set of measurements all twenty-five diagnostics were fielded simultaneously on every shot.
Octonionic Realizations of 1-dimensional Extended Supersymmetries. A Classification
Carrion, H L; Toppan, F
2003-01-01
The classification of the octonionic realizations of the one-dimensional extended supersymmetries is here furnished. These are non-associative realizations which, albeit inequivalent, are put in correspondence with a subclass of the already classified associative representations for 1D extended supersymmetries. Examples of dynamical systems invariant under octonionic realizations of the extended supersymmetries are given. We cite among the others the octonionic spinning particles, the N=8 KdV, etc. Possible applications to supersymmetric systems arising from dimensional reduction of the octonionic superstring and M-theory are mentioned.
Octonionic realizations of 1-dimensional extended supersymmetries. A classification
Carrion, H.L.; Rojas, M.; Toppan, F. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil). Coordenacao de Teoria de Campos e Particulas]. E-mail: hleny@cbpf.br; mrojas@cbpf.br; toppan@cbpf.br
2002-12-01
The classification of the octonionic realizations of the one-dimensional extended supersymmetries is here furnished. These are non-associative realizations which, albeit inequivalent, are put in correspondence with a subclass of the already classified associative representations for 1D extended supersymmetries. Examples of dynamical systems invariant under octonionic realizations of the extended supersymmetries are given. We cite among the others the octonionic spinning particles, the N = 8 KdV, etc. Possible applications to supersymmetric systems arising from dimensional reduction of the octonionic superstring and M-theory are mentioned. (author)
Fermionic coset realization of primaries in critical statistical models
Cabra, D C; Rothe, K D
1995-01-01
We obtain a fermionic coset realization of the primaries of minimal unitary models and show how their four-point functions may be calculated by the use of a reduction formula. We illustrate the construction for the Ising model, where we obtain an explicit realization of the energy operator, Onsager fermions, as well as of the order and disorder operators realizing the dual algebra, in terms of constrained Dirac fermions. The four-point correlators of these operators are shown to agree with those obtained by other methods.
Forecasting stock market volatility: Do realized skewness and kurtosis help?
Mei, Dexiang; Liu, Jing; Ma, Feng; Chen, Wang
2017-09-01
In this study, we investigate the predictability of the realized skewness (RSK) and realized kurtosis (RKU) to stock market volatility, that has not been addressed in the existing studies. Out-of-sample results show that RSK, which can significantly improve forecast accuracy in mid- and long-term, is more powerful than RKU in forecasting volatility. Whereas these variables are useless in short-term forecasting. Furthermore, we employ the realized kernel (RK) for the robustness analysis and the conclusions are consistent with the RV measures. Our results are of great importance for portfolio allocation and financial risk management.
Realizability algebras: a program to well order R
Krivine, Jean-Louis
2010-01-01
We give a method to transform into programs, classical proofs using a well ordering of the reals. The technology uses a generalization of Cohen's forcing and the theory of classical realizability introduced by the author.
Fermionic coset realization of the critical Ising model
Cabra, D C; Rothe, K D
1995-01-01
We obtain an explicit realization of all the primary fields of the Ising model in terms of a conformal field theory of constrained fermions. The four-point correlators of the energy, order and disorder operators are explicitly calculated.
On Hamiltonian realization of time-varying nonlinear systems
无
2007-01-01
This paper Investigates Hamiltonian realization of time-varying nonlinear (TVN) systems, and proposes a number of new methods for the problem. It is shown that every smooth TVN system can be expressed as a generalized Hamiltonian system if the origin is the equilibrium of the system. If the Jacooian matrix of a TVN system is nonsingu-lar, the system has a generalized Hamiltonian realization whose structural matrix and Hamiltonian function are given explicitly. For the case that the Jacobian matrix is singular, this paper provides a constructive decomposition method, and then proves that a TVN system has a generalized Hamiltonian realization if its Jacobian matrix has a nonsingular main diagonal block. Furthermore, some sufficient (necessary and sufficient) conditions for dissipative Hamiltonian realization of TVN systems are also presented in this paper.
Realizing the Value of a National Asset: Scientific Data
Wilson, Anne; Downs, Robert R.; Lenhardt, W. Christopher; Meyer, Carol; Michener, William; Ramapriyan, Hampapuram; Robinson, Erin
2014-12-01
"We have a shared responsibility to create and implement strategies to realize the full potential of digital information for present and future generations," according to the Electronic Geophysical Year (eGY) Declaration [CoBabe-Ammann et al., 2007
A Fractal Landscape Realizer for Generating Synthetic Maps
William Hargrove
2002-06-01
Full Text Available A fractal landscape realizer has been developed that generates synthetic landscape maps to user specifications. The alternative landscape realizations are not identical to the actual maps after which they are patterned, but are similar statistically (i.e., the areas and fractal character of each category are replicated. A fractal or self-affine pattern generator is used to provide a spatial probability surface for each category in the synthetic map. The Fractal Realizer arbitrates contentions among categories in a way that makes it possible to preserve the fractal patterns of all the categories in the resulting synthetic landscape. Each synthetic landscape is one equally likely realization from among an infinite ensemble of possible fractal landscape combinations. Synthetic landscapes produced by the Fractal Realizer have been tested using a variant of the Turing Test. More than 100 map experts were presented with a series of 20 selections of paired maps, and asked to distinguish the real map from the synthetic realization. The resulting population of scores was not significantly different from a random binomial, suggesting that the experts were unable to discern the synthetic maps from the actual ones. Statistical landscape indices computed for 25 different synthetic realizations are compared with the values computed for the actual maps. The Fractal Realizer can be used as a stochastic generator of synthetic input maps to a spatially explicit simulation model to test the effects of landscape rearrangement on the uncertainty of model parameter estimates. The sensitivity of stochastic spatial simulations to prescribed input landscapes can be evaluated by supplying them with a series of synthetic maps that obey particular statistical characteristics and by monitoring changes in selected output responses. Statistically similar input landscapes with different spatial arrangements can be generated and supplied to spatial models as a hedge against
PRINCIPLES OF FORMATION AND REALIZATION OF REGIONAL INDUSTRIAL POLICY
R.I. Chenenova
2007-09-01
Full Text Available It is analysed existing norm-legal base of realization of regional industrial policy from a position of conformity of principles of its formation and realization to problems of development of the industry in conditions of an openness to the world market. Opportunities of their evolution in the directions promoting becoming of competitive structure of an industrial complex of region are shown.
Realized Bond-Stock Correlation: Macroeconomic Announcement Effects
Christiansen, Charlotte; Ranaldo, Angelo
2005-01-01
We investigate the effects of macroeconomic announcements on the realized correlation between bond and stock returns. Our results deliver insights into the dominating drivers of bond-stock comovements. We find that it is not so much the surprise component of the announcement, but the mere fact that an announcement occurs that influences the realized bond-stock correlation. The impact of macroeconomic announcements varies across the business cycle. Announcement effects are highly dependent on ...
Realized Jump Risk and Equity Return in China
Guojin Chen; Xiaoqun Liu; Peilin Hsieh; Xiangqin Zhao
2014-01-01
We utilize the realized jump components to explore a new jump (including nonsystematic jump and systematic jump) risk factor model. After estimating daily realized jumps from high-frequency transaction data of the Chinese A-share stocks, we calculate monthly jump size, monthly jump standard deviation, and monthly jump arrival rate and then use those monthly jump factors to explain the return of the following month. Our empirical results show that the jump tail risk can explain the equity retu...
Newly-developed Fiber Product: How to Realize the Value Chain
Wang Ting
2010-01-01
@@ However, for domestic Chinese textile enterprise, most of them have the ability to develop new textile fibers. In the past years, fiber products, such as the corn fiber, milk fiber, bamboo fiber and so on, mushroomed in the markets. Whereas, during the process of product promotion, they experience a bottleneck: from fiber to consumer, how to improve and realize the long value chain, how to promote the industrial application.
Loeffler, Andreas
2008-11-05
At the beginning, we improved the three dimensional optical confinement of the micropillars. The quality factor of the pillars could be increased by the use of higher reflectivity mirrors and a matched V/III ratio for the different epitaxial layers. Hence, a record quality factor of about 90000 was achieved for an active micropillar with 26 (30) mirror pairs in the top (bottom) DBR and a diameter of 4 {mu}m. In parallel to this, we made studies on the growth of self-assembled GaInAs quantum dots on GaAs substrates. Here, the nucleation of three dimensional islands as well as their optical properties were object of the investigation. The morphological properties of the dots were analyzed by transmission and scanning electron microscopy, and the optical properties were investigated by photoluminescence and photoreflectance measurements. The optical and particularly the morphological properties of the self-assembled GaInAs quantum dots were essentially improved. Due to a low strain nucleation layer with an indium content of 30 %, the dot density could be reduced to 6-9 x 10{sup 9} cm{sup -2} and their geometric dimensions were increased to typical lengths between 50 and 100 nm and widths of about 30 nm. The lattice mismatch between the quantum dots and the surrounding matrix is decreased due to the reduced indium content. The minimized strain during the dot growth leads to an enhanced migration length of the deposited atoms on the surface. Finally, the obtained findings of the MBE growth of microcavities, their fabrication and the self-assembled island growth of GaInAs on GaAs were used for the realization of further samples. Low strain GaInAs quantum dots were embedded into the microresonators. These structures allowed for the first time the observation of strong coupling between light and matter in a semiconductor. In case of the low strain quantum dots with enlarged dimensions in the strong coupling regime, a vacuum Rabi-splitting of about 140 {mu}eV between the
Realizable Paths and the NL vs L Problem
Kintali, Shiva
2010-01-01
A celebrated theorem of Savitch states that NSPACE(S) is contained in DSPACE(S^2). In particular, Savitch gave a deterministic algorithm to solve ST-CONNECTIVITY (an NL-complete problem) using O(log^2{n}) space, implying NL is in DSPACE(log^2{n}). While Savitch's theorem itself has not been improved in the last four decades, studying the space complexity of several special cases of ST-CONNECTIVITY has provided new insights into the space-bounded complexity classes. In this paper, we introduce new kind of graph connectivity problems which we call graph realizability problems. All of our graph realizability problems are generalizations of UNDIRECTED ST-CONNECTIVITY. ST-REALIZABILITY, the most general graph realizability problem, is LogCFL-complete. We define the corresponding complexity classes that lie between L and LogCFL and study their relationships. As special cases of our graph realizability problems we define two natural problems, BALANCED ST-CONNECTIVITY and POSITIVE BALANCED ST-CONNECTIVITY, that lie b...
Scaling and memory in the return intervals of realized volatility
Ren, Fei; Gu, Gao-Feng; Zhou, Wei-Xing
2009-11-01
We perform return interval analysis of 1-min realized volatility defined by the sum of absolute high-frequency intraday returns for the Shanghai Stock Exchange Composite Index (SSEC) and 22 constituent stocks of SSEC. The scaling behavior and memory effect of the return intervals between successive realized volatilities above a certain threshold q are carefully investigated. In comparison with the volatility defined by the closest tick prices to the minute marks, the return interval distribution for the realized volatility shows a better scaling behavior since 20 stocks (out of 22 stocks) and the SSEC pass the Kolmogorov-Smirnov (KS) test and exhibit scaling behaviors, among which the scaling function for 8 stocks could be approximated well by a stretched exponential distribution revealed by the KS goodness-of-fit test under the significance level of 5%. The improved scaling behavior is further confirmed by the relation between the fitted exponent γ and the threshold q. In addition, the similarity of the return interval distributions for different stocks is also observed for the realized volatility. The investigation of the conditional probability distribution and the detrended fluctuation analysis (DFA) show that both short-term and long-term memory exists in the return intervals of realized volatility.
Constraint Complexity of Realizations of Linear Codes on Arbitrary Graphs
Kashyap, Navin
2008-01-01
A graphical realization of a linear code C consists of an assignment of the coordinates of C to the vertices of a graph, along with a specification of linear state spaces and linear ``local constraint'' codes to be associated with the edges and vertices, respectively, of the graph. The $\\k$-complexity of a graphical realization is defined to be the largest dimension of any of its local constraint codes. $\\k$-complexity is a reasonable measure of the computational complexity of a sum-product decoding algorithm specified by a graphical realization. The main focus of this paper is on the following problem: given a linear code C and a graph G, how small can the $\\k$-complexity of a realization of C on G be? As useful tools for attacking this problem, we introduce the Vertex-Cut Bound, and the notion of ``vc-treewidth'' for a graph, which is closely related to the well-known graph-theoretic notion of treewidth. Using these tools, we derive tight lower bounds on the $\\k$-complexity of any realization of C on G. Our...
Management of purchase process in realization of building investment
M. Radoń
2010-07-01
Full Text Available In building companies process of product and service purchase is one of the main processes of quality management system [1]. Because ofshort time-limits of contract realization, high specialization of works, necessity of fulfillment of high quality requirements and assurance of profitable financial effects the management of purchase process becomes very important element of work of the building company. The serious problem in creating and keeping the efficient system of purchase management is special type of purchase in building companies. Particular investments are realized in different country regions, objects are built based on the individual design documentations and each building becomes independent organization unit that organize purchase necessary for investment realization.An example of the management system of purchase process in building company is described in the paper. Just In Time system is widelyused during the realization of building investment. This system is especially useful in buildings because some investments, especially inbig cities, are characterized by restriction in building site. This makes impossible storing the products. In such cases close synchronization between times of delivery and requirements of purchase schedule and schedule of building realization is very important. Criteria of supplier selection as well as the methods of choosing the supplier are also presented in the paper. Special attention is paid to necessity of valuation of the purchase efficiency and the purchase risk. Basic coefficients of purchase efficiency are also described in the paper.
RESEMBLANCE OF INDIRECTNESS IN POLITENESS OF EFL LEARNERS’ REQUEST REALIZATIONS
Indawan Syahri
2013-07-01
Full Text Available Abstract: Politeness principles are universally utilized by the speakers of any language when realizing various speech acts. However, the speakers of particular languages relatively apply politeness due to the cultural norms embedded. The present study attempts to delineate how the Indonesian learners of English (ILE apply the politeness principles in request realizations. Specifically it devotes to the types of politeness strategies applied and resemblance of the indirectness in politeness strategies in requesting acts. The FTAs and indirectness are the theoretical bases used to trace the typologies of both politeness and request strategies. The data werere collected by means of certain elicitation techniques, i.e. DCTs and Role-plays. The analyses werere done through three stages; determining request strategies, politeness strategies, and resemblance of indirectness in politeness. The results show that the indirectness generally is parallel to politeness. Besides, some pragmatic transfers are found in terms of applying native-culture norms in realizing target speech acts.
Synchronization for the Realization-Dependent Probabilistic Boolean Networks.
Chen, Hongwei; Liang, Jinling; Lu, Jianquan; Qiu, Jianlong
2017-01-24
This paper investigates the synchronization problem for the realization-dependent probabilistic Boolean networks (PBNs) coupled unidirectionally in the drive-response configuration. The realization of the response PBN is assumed to be uniquely determined by the realization signal generated by the drive PBN at each discrete time instant. First, the drive-response PBNs are expressed in their algebraic forms based on the semitensor product method, and then, a necessary and sufficient condition is presented for the synchronization of the PBNs. Second, by resorting to a newly defined matrix operator, the reachable set from any initial state is expressed by a column vector. Consequently, an easily computable algebraic criterion is derived assuring the synchronization of the drive-response PBNs. Finally, three illustrative examples are employed to demonstrate the applicability and usefulness of the developed theoretical results.
Experimental realization of an achromatic magnetic mirror based on metamaterials.
Pisano, Giampaolo; Ade, Peter A R; Tucker, Carole
2016-06-20
Our work relates to the use of metamaterials engineered to realize a metasurface approaching the exotic properties of an ideal object not observed in nature, a "magnetic mirror." Previous realizations were based on resonant structures that implied narrow bandwidths and large losses. The working principle of our device is ideally frequency-independent, it does not involve resonances and it does not rely on a specific technology. The performance of our prototype, working at millimeter wavelengths, has never been achieved before and it is superior to any other device reported in the literature, both in the microwave and optical regions. The device inherently has large bandwidth (144%), low losses (<1%), and is almost independent of incidence angle and polarization state, and thus approaches the behavior of an ideal magnetic mirror. Applications of magnetic mirrors range from low-profile antennas, absorbers to optoelectronic devices. Our device can be realized using different technologies to operate in other spectral regions.
Using a quantum dot system to realize perfect state transfer
Li Ji; Wu Shi-Hai; Zhang Wen-Wen; Xi Xiao-Qiang
2011-01-01
There are some disadvantages to Nikolopoulos et al.'s protocol [Nikolopoulos G M,Petrosyan D and Lambropoulos P 2004 Europhys.Lett.65 297] where a quantum dot system is used to realize quantum communication.To overcome these disadvantages,we propose a protocol that uses a quantum dot array to construct a four-qubit spin chain to realize perfect quantum state transfer (PQST).First,we calculate the interaction relation for PQST in the spin chain.Second,we review the interaction between the quantum dots in the Heitler-London approach.Third,we present a detailed program for designing the proper parameters of a quantum dot array to realize PQST.
Realization of Multistage FIR Filters using Pipelining-Interleaving
M. Ciric
2012-11-01
Full Text Available Multistage digital filters can be one of the solutions for the realization of filters with a narrow transition zone. If requirements for the width of transition zone are too strict, then they are the only alternative, and the decimation/interpolation must be performed in several steps. Combining decimation/interpolation operations related to the implementation of multi-channel filters in the PI (pipelining/interleaving technique can give an efficient structure of multichannel multistage filter. Using the advantages offered by newer generations of FPGA chips in terms of digital design structure, it is possible to realize such filters with considerable savings of hardware resources and reduce the effect of finite length codeword. This paper proposes such an efficient implementation and presents the results of such a realization with FPGA components.
Realizing a lattice spin model with polar molecules
Yan, Bo; Gadway, Bryce; Covey, Jacob P; Hazzard, Kaden R A; Rey, Ana Maria; Jin, Deborah S; Ye, Jun
2013-01-01
With the recent production of polar molecules in the quantum regime, long-range dipolar interactions are expected to facilitate the understanding of strongly interacting many-body quantum systems and to realize lattice spin models for exploring quantum magnetism. In atomic systems, where interactions require wave function overlap, effective spin interactions on a lattice can be realized via superexchange; however, the coupling is weak and limited to nearest-neighbor interactions. In contrast, dipolar interactions exist in the absence of tunneling and extend beyond nearest neighbors. This allows coherent spin dynamics to persist even at high entropy and low lattice filling. Effects of dipolar interactions in ultracold molecular gases have so far been limited to the modification of chemical reactions. We now report the observation of dipolar interactions of polar molecules pinned in a 3D optical lattice. We realize a lattice spin model with spin encoded in rotational states, prepared and probed by microwaves. T...
An Intelligent Agency Framework to Realize Adaptive System Management
FU Yu; SHEN Jun-yi; FENG Zhong-hui; WANG Yong
2007-01-01
In order to realize the required scalable and adaptive system management, an interactive intelligent agency framework, iSMAcy (intelligent System Management Agency), is proposed as an integrated solution to realize distributed autonomous system management. Firstly, it is a multiagent platform that supports inter-agent communication and cooperation. Secondly, the functional agents are based on intentional agent architecture that achieves balance between goal-directed behavior and situated reactive action. An example of applying the iSMAcy system to a network management environment has been described to illustrate and validate the scalable and adaptive management capability of the intelligent agency framework.
Nonlinear gauge realization of spacetime symmetries including translations
Julve, J; Tiemblo, A; Tresguerres, R; Julve, J; Tiemblo, A; Tresguerres, R
1994-01-01
We present a general scheme for the nonlinear gauge realizations of spacetime groups on coset spaces of the groups considered. In order to show the relevance of the method for the rigorous treatment of the translations in gravitational gauge theories, we apply it in particular to the affine group. This is an illustration of the family of spacetime symmetries having the form of a semidirect product H\\semidirect T, where H is the stability subgroup and T are the translations . The translational component of the connection behaves like a true tensor under H when coset realizations are involved.
Design and elementary realization of the Vision Earth System
无
2007-01-01
The Vision Earth System is a interactive system by employing B/S model. The system has the function of query display and mutuaUy displays relevant geologic information, integrating image information of one outcrop and realizing 3D geologic visualization. In this system, the basis is effective store, transmitting, display and quick query of enormous images and their properties data. From Java technology, this essay researches the elementary realization of Vision Earth System by adopting store formality of enormous images database,quick display image of website and quick image storage method.
Polylingual Education Realization, Based on Ethnolingual Didactic Approach
Gulnara T. Smagulova
2013-01-01
Full Text Available The article examines the problems of polylingual education development in the context of the state program documents, particularly determines socio-pedagogical factors of its realization. The author presents the study of current sociolinguistic issues by means of educational measurement. The article gives brief analysis of ethnolingual didactics definitions by different sources. Ethnolingual didactic approach is defined as the strategic methodological feature for the realization of polylingual education, which is the trinity of individual education, upbringing and development as a polylingual personality on the basis of simultaneous acquisition of several languages.
Research and realization of info-net security controlling system
Xu, Tao; Zhang, Wei; Li, Xuhong; Wang, Xia; Pan, Wenwen
2017-03-01
The thesis introduces some relative concepts about Network Cybernetics, and we design and realize a new info-net security controlling system based on Network Cybernetics. The system can control the endpoints, safely save files, encrypt communication, supervise actions of users and show security conditions, in order to realize full-scale security management. At last, we simulate the functions of the system. The results show, the system can ensure the controllability of users and devices, and supervise them real-time. The system can maximize the security of the network and users.
Optical Realization of Deterministic Entanglement Concentration of Polarized Photons
GU Yong-Jian; XIAN Liang; LI Wen-Dong; MA Li-Zhen
2008-01-01
@@ We propose a scheme for optical realization of deterministic entanglement concentration of polarized photons.To overcome the difficulty due to the lack of sufficiently strong interactions between photons, teleportation is employed to transfer the polarization states of two photons onto the path and polarization states of a third photon, which is made possible by the recent experimental realization of the deterministic and complete Bell state measurement. Then the required positive operator-valued measurement and further operations can be implemented deterministically by using a linear optical setup. All these are within the reach of current technology.
Design and Realization of Teaching Demonstration System Based on .Net
Ailian Wang
2013-04-01
Full Text Available In order to realize the systematic planning for teaching demonstration, this article proposed a teaching demonstration system based on .Net. The system adopted the techniques of Windows forms and serialization, Windows tree controls and the type and level of algorithm, component interface, advanced realization of windows graphics device interface, graphics drawing application programming interface, object link embedded, platform/assembly technology based on SOA, and was applied successfully in the development of the project, providing an effective method for informatization teaching.
Higher-order Brunnian structures and possible physical realizations
A. Baas, Nils; V. Fedorov, D.; S. Jensen, A.
2014-01-01
to the binding of systems in nature. It now appears that recent generalization to higher order Brunnian structures may potentially be realized as laboratory made or naturally occurring systems. With the binding energy as measure, we discuss possibilities of physical realization in nuclei, cold atoms......, and condensed matter systems. Appearance is not excluded. However, both the form and the strengths of the interactions must be rather special. The most promising subfields for present searches would be in cold atoms because of external control of effective interactions, or perhaps in condensed-matter systems...
Humanoid Robot 3 -D Motion Simulation for Hardware Realization
CAO Xi; ZHAO Qun-fei; MA Pei-sun
2007-01-01
In this paper, three dimensions kinematics andkinetics simulation arc discussed for hardware realization ofa physical biped walking-chair robot. The direct and inverseclose-form kinematics solution of the biped walking-chairis deduced. Several gaits are realized with thekinematics solution, including walking straight on levelfloor, going up stair, squatting down and standing up. ZeroMoment Point(ZMP) equation is analyzed considering themovement of the crew. The simulated biped walking-chairrobot is used for mechanical design, gaits development andvalidation before they are tested on real robot.
Sign and Quantiles of the Realized Stock-Bond Correlation
Aslanidis, Nektarios; Christiansen, Charlotte
We scrutinize the monthly realized stock-bond correlation based upon high frequency returns. In particular, we use a probit model to track the dynamics of the sign of the correlation relative to its various economic forces. The sign is predictable to a large extent with bond market liquidity being...... the most important variable. Moreover, stock market volatility, inflation uncertainty, short rate volatility, and bond volatility have significant effects upon the sign. In addition, we use quantile regressions to pin down the systematic variation of the extreme tails of the realized stock-bond correlation...... of the stock-bond correlation....
Hardware Realization of Chaos Based Symmetric Image Encryption
Barakat, Mohamed L.
2012-06-01
This thesis presents a novel work on hardware realization of symmetric image encryption utilizing chaos based continuous systems as pseudo random number generators. Digital implementation of chaotic systems results in serious degradations in the dynamics of the system. Such defects are illuminated through a new technique of generalized post proceeding with very low hardware cost. The thesis further discusses two encryption algorithms designed and implemented as a block cipher and a stream cipher. The security of both systems is thoroughly analyzed and the performance is compared with other reported systems showing a superior results. Both systems are realized on Xilinx Vetrix-4 FPGA with a hardware and throughput performance surpassing known encryption systems.
Realization of the Three-Qubit Toffoli Gate in Molecules
DU Jiang-Feng; SHI Ming-Jun; ZHOU Xian-Yi; FAN Yang-Mei; WU Ji-Hui; YE Bang-Jiao; WENG Hui-Min; HAN Rong-Dian
2000-01-01
We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation.It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits.
GUO Qing-lin; FAN Xiao-zhong; LIU Chang-an
2006-01-01
A method of realization of automatic abstracting based on text clustering and natural language understanding is explored,aimed at overcoming shortages of some current methods.The method makes use of text clustering and can realize automatic abstracting of multi-documents.The algorithm of twice word segmentation based on the title and first sentences in paragraphs is investigated..Its precision and recall is above 95%.For a specific domain on plastics,an automatic abstracting system named TCAAS is implemented.The precision and recall of multi-document's automatic abstracting is above 75%.Also,the experiments prove that it is feasible to use the method to develop a domain automatic abstracting system,which is valuable for further in-depth study.
Development and realization of the microsystem for energy-saving food storage MIZEL
Grassnick, R.; Traenkler, H.R. [Universitaet der Bundeswehr Muenchen, Neubiberg (Germany). Inst. fuer Mess- und Automatisierungstechnik; Geissler, C. [Indatec GmbH, Bernau (Germany); Heinze, M. [Infra Tec GmbH, Dresden (Germany)
2001-07-01
A prototype of an advanced food storage system for private households has been developed and realized. It is used in order to validate experiments, which acknowledge the fact that food remain fresh, if it is stored at certain humidity values. The design, development, and realization of the food container took place in several steps: the fundamental studies at an experimental model with a PC development environment by the IMA, the upgrading in surface mounted technology (SMT) by the indatec GmbH, the upgrading in micro system technology (MST) by the infratec GmbH, and the test of the total system by the IMA. To make the system energy-autonomous, it is supplied by solar cells. Due to the fact that the system is dependent on light a special power management and an energy-saving control algorithm have been designed and low power consuming components have been used. (orig.)
M. De la Sen
2008-01-01
Full Text Available This paper investigates key aspects of realization and partial realization theories for linear time-invariant systems being subject to a set of incommensurate internal and external point delays. The results are obtained based on the use of formal Laurent expansions whose coefficients are polynomial matrices of appropriate orders and which are also appropriately related to truncated and infinite block Hankel matrices. The above-mentioned polynomial matrices arise in a natural way from the transcendent equations associated with the delayed dynamics. The results are linked to the properties of controllability and observability of dynamic systems. Some related overview is given related to robustness concerned with keeping the realization properties under mismatching between a current transfer matrix and a nominal one.
Realization of a Quantum Scheduling Algorithm Using Nuclear Magnetic Resonance
ZHANG Jing-Fu; DENG Zhi-Wei; PAN Yan-Na; LU Zhi-Heng
2004-01-01
The quantum scheduling algorithm proposed by Grover is generalized to extend its scope of applications. The generalized algorithm proposed here is realized on a nuclear magnetic resonance quantum computer. The experimental results show that the generalized algorithm can work efficiently in the case that Grover's scheduling algorithm is completely invalid, and represent the quantum advantages when qubits replace classical bits.
Functional model realizations for Schur functions on C+
Kurula, Mikael; Ball, Joseph A.; Staffans, Olof J.; Zwart, Hans
2014-01-01
For an arbitrary given operator Schur function defined on the complex right-half plane, we give a controllable energy-preserving and an observable co-energy-preserving de Branges-Rovnyak functional model realization. Topics appearing only in the right-half-plane setting, such as the extrapolation sp
Smart Materials For The Realization Of An Adaptive Building Component
Lelieveld, C.M.J.L.
2013-01-01
This research focusses on the realization of adaptive architecture with the use of advanced material technology. Current material research has shown significant advances with the development of “smart” materials. Smart materials are “capable of automatically and inherently sensing or detecting chang
Canonical realization of Bondi-Metzner-Sachs symmetry: Quadratic Casimir
Gomis, Joaquim; Longhi, Giorgio
2016-01-01
We study the canonical realization of Bondi-Metzner-Sacks symmetry for a massive scalar field introduced by Longhi and Materassi [J. Math. Phys. 40, 480 (1999)]. We construct an invariant scalar product for the generalized momenta. As a consequence we introduce a quadratic Casimir with the supertranslations.
Government 2.0: key challenges to its realization
Meijer, Albert Jacob; Koops, Bert-Jaap; Pieterson, Willem Jan; Overman, Sjors; ten Tije, Sanne
2012-01-01
Government 2.0 is often presented as a means to reinforce the relation between state and citizens in an information age. The promise of Government 2.0 is impressive but its potential has not or hardly been realized yet in practice. This paper uses insights from various disciplines to understand
A New Procedure for Stochastic Realization of Spectral Density Matrices
Schaft, A.J. van der; Willems, J.C.
1984-01-01
In this paper we consider the problem of obtaining a state space realization of a zero mean gaussian vector process. A new algorithm is presented for the case in which the process is given in terms of its spectral density function. Contrary to the usual procedure followed, which requires a partial f
A new procedure for stochastic realization of spectral density matrices
Schaft, van der A.J.; Willems, J.C.
1984-01-01
In this paper we consider the problem of obtaining a state space realization of a zero mean gaussian vector process. A new algorithm is presented for the case in which the process is given in terms of its spectral density function. Contrary to the usual procedure followed, which requires a partial f
Singular Value Analysis and Balanced Realizations for Nonlinear Systems
Fujimoto, Kenji; Scherpen, Jacquelien M.A.; Rommes, Joost; Schilders, Wilhelmus H.A.; Vorst, Henk A. van der
2008-01-01
For linear control systems minimal realization theory and the related model reduction methods play a crucial role in understanding and handling the system. These methods are well established and have proved to be very successful. In particular the method called balanced truncation gives a good
Properties of realized variance under alternative sampling schemes
Oomen, R.C.A.
2006-01-01
This paper investigates the statistical properties of the realized variance estimator in the presence of market microstructure noise. Different from the existing literature, the analysis relies on a pure jump process for high frequency security prices and explicitly distinguishes among alternative
Realized Bond-Stock Correlation: Macroeconomic Announcement Effects
Christiansen, Charlotte; Ranaldo, Angelo
2005-01-01
We investigate the effects of macroeconomic announcements on the realized correlation between bond and stock returns. Our results deliver insights into the dominating drivers of bond-stock comovements. We find that it is not so much the surprise component of the announcement, but the mere fact th...
Smart Materials For The Realization Of An Adaptive Building Component
Lelieveld, C.M.J.L.
2013-01-01
This research focusses on the realization of adaptive architecture with the use of advanced material technology. Current material research has shown significant advances with the development of “smart” materials. Smart materials are “capable of automatically and inherently sensing or detecting
An Incremental Approach to Support Realization of Modularization Benefits
Hansen, Poul H. Kyvsgård; Sun, Hongyi
2010-01-01
In general, the phenomenon of managing modularization is not well known. The cause-effect relationships between modularization and realized benefits are complex and comprehensive. Though a number of research works have contributed to the study of the phenomenon of efficient and effective modulari...
Realizability Semantics for Quantified Modal Logic : Generalizing Flagg's 1985 Construction
Rin, B.G.; Walsh, Sean
2016-01-01
A semantics for quantified modal logic is presented that is based on Kleene’s notion of realizability. This semantics generalizes Flagg’s 1985 construction of a model of a modal version of Church’s Thesis and first-order arithmetic. While the bulk of the paper is devoted to developing the details of
A symmetry for vanishing cosmological constant: Another realization
Erdem, R
2006-01-01
A more conventional realization of a symmetry which had been proposed towards the solution of cosmological constant problem is considered. In this study the multiplication of the coordinates by the imaginary number $i$ in the literature is replaced by the multiplication of the metric tensor by minus one. This realization of the symmetry as well forbids a bulk cosmological constant and selects out $2(2n+1)$ dimensional spaces. On contrary to its previous realization the symmetry, without any need for its extension, also forbids a possible cosmological constant term which may arise from the extra dimensional curvature scalar provided that the space is taken as the union of two $2(2n+1)$ dimensional spaces where the usual 4-dimensional space lies at the intersection of these spaces. It is shown that this symmetry may be realized as translations in the extra dimensions of a non-orientable space. A possible relation of this symmetry to the E-parity symmetry of Linde is also pointed out.
Exploring Phonetic Realization in Danish by Transformation-Based Learning
Uneson, Marcus; Schachtenhaufen, Ruben
2011-01-01
We align phonemic and semi-narrow phonetic transcriptions in the DanPASS corpus and extend the phonemic description with sound classes and with traditional phonetic features. From this representation, we induce rules for phonetic realization by Transformation-Based Learning (TBL). The rules thus...
Reading on the Internet: Realizing and Constructing Potential Texts
Cho, Byeong-Young; Afflerbach, Peter
2015-01-01
Successful Internet reading requires making strategic decisions about what texts to read and a sequence for reading them, all in accordance with readers' goals. In this paper, we describe the process of realizing and constructing potential texts as an important and critical part of successful Internet reading and use verbal report data to…
Realization of Lossless Systems Via Constant Matrix Factorizations
Rapisarda, Paolo; Rao, Shodhan
2013-01-01
We study the realization problem for linear time-invariant systems described by higher-order differential equations, which are J-lossless with constant J. Our approach is based on the factorization of a constant matrix obtained in a straightforward way from the storage function of the system. State
Ethos and Vision Realization in Sponsored Academy Schools
Gibson, Mark T.
2015-01-01
This article investigates the realization of ethos and vision in the early stages of sponsored academy schools in England. It is a qualitative nested case study of ten academies. Nineteen key actors were interviewed, including principals and sponsor representatives. The nests were organized by sponsor type. Key themes are discussed within the…
Properties of realized variance under alternative sampling schemes
Oomen, R.C.A.
2006-01-01
This paper investigates the statistical properties of the realized variance estimator in the presence of market microstructure noise. Different from the existing literature, the analysis relies on a pure jump process for high frequency security prices and explicitly distinguishes among alternative s
Exploiting network redundancy for low-cost neural network realizations.
Keegstra, H; Jansen, WJ; Nijhuis, JAG; Spaanenburg, L; Stevens, H; Udding, JT
1996-01-01
A method is presented to optimize a trained neural network for physical realization styles. Target architectures are embedded microcontrollers or standard cell based ASIC designs. The approach exploits the redundancy in the network, required for successful training, to replace the synaptic weighting
Metamaterial-Based Cylinders Used for Invisible Cloak Realization
2011-08-01
Branimir Ivsic Tin Komljenovic University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb, Croatia HR-10000...PROGRAM ELEMENT NUMBER 61102F 6. AUTHOR(S) Zvonimir Sipus Dario Bojanjac Branimir Ivsic Tim Komljenovic 5d. PROJECT NUMBER 5d. TASK...Used for Invisible Cloak Realization by Zvonimir Sipus Dario Bojanjac Branimir Ivsic Tin Komljenovic
Realizing sub-wavelength imaging with evolutionary optimization
Zhang, Jingjing
2015-01-01
Here we propose an approach to realize farfield subwavelength imaging lens by combining the transformation optics methodology with evolutionary optimization method. The lens is composed of an isotropic dielectric core and anisotropic or isotropic dielectric matching layer, of which the parameters...
Ethos and Vision Realization in Sponsored Academy Schools
Gibson, Mark T.
2015-01-01
This article investigates the realization of ethos and vision in the early stages of sponsored academy schools in England. It is a qualitative nested case study of ten academies. Nineteen key actors were interviewed, including principals and sponsor representatives. The nests were organized by sponsor type. Key themes are discussed within the…
Analysis of enabling factors in realizing modularization benefits
Storbjerg, Simon Haahr; Brunø, Thomas Ditlev
2012-01-01
Although modularization is becoming a welldescribed and broadly applied concept, many of today’s firms still struggle to realize the promised benefits of this approach. Managing modularization is a complex matter, and in spite of this, a topic that has received far less attention compared to theo...
Analysis of enabling factors in realizing modularization benefits
Storbjerg, Simon Haahr; Brunø, Thomas Ditlev
2012-01-01
to theories and methods concerning modularization of technical systems.Recognizing the need for guidance to realize the benefits of modularity, the purpose of this study is through a literature study and a case study to improve the insight into the organizational and systems related enablers and barriers...
Realizing Clean Energy's Potential: Lessons Learned in the U.S. West (Technical Report)
2014-05-01
NREL Analysis Insights connects the dots between NREL studies, pulling big picture insights from a larger body of work. In the premiere issue of our new periodical Analysis Insights, we explore lessons learned from experience in the U.S. West for realizing clean energy's potential.
Coleman, Elizabeth; Leider, Megan
2014-01-01
This study focuses on the experience of designing and implementing an action research-based curriculum in a secondary science classroom. By systematically examining ourselves and our practices, we brought to light beliefs and values that were realized through this process, came to a deeper understanding of our own learning, and developed new…
Sezac, L. [Grenoble-1 Univ., 38 (France)
1993-01-20
The correlation measurements between light particles emitted during heavy ion collisions allow to estimate the time-space extension of the emitting sources. This report about the preliminaries of two correlation experiments is split into two parts. The first one describes a test experiment, performed to study the feasibility of a correlation experiment at very low relative momenta with the help of a magnetic spectrometer. The results will allow to determine the still unknown relative effects from the final state interaction and the combination of both Coulomb interaction and quantum statistics. A correlation study without experimental selection of the impact parameter gives unclear answers about the sizes and the temporal characteristics of the emitting systems. The second part analyses the sources of the alpha particles detected in the reaction chamber of the multidetector ORION used as a violence of the reaction filter. The results show that it is possible to consider as a good filter a fast information called `prompt peak` (correlated to the neutron multiplicity detected with ORION). Under such conditions a study of two particle correlations from equilibrated systems with a reasonable statistics becomes thinkable. The results obtained allow to characterize the emitting sources (speed, intensity, temperature) as a function of the violence of the reaction for the system {sup 208} Pb + {sup 93} Nb at 29 MeV/u. (author) 85 refs.
IDC Re-Engineering Phase 2 Iteration E3 Use Case Realizations Version 1.2
Hamlet, Benjamin R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Harris, James M. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Burns, John F. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2017-01-01
This document contains 4 use case realizations generated from the model contained in Rational Software Architect. These use case realizations are the current versions of the realizations originally delivered in Elaboration Iteration 3.
IDC Re-Engineering Phase 2 Iteration E1 Use Case Realizations version 1.2.
Hamlet, Benjamin R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Harris, James M. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Burns, John F. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Montoya, Mark Sinclair [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandoval, Rudy Daniel [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2016-12-01
This document contains 4 use case realizations generated from the model contained in Rational Software Architect. These use case realizations are the current versions of the realizations originally delivered in Elaboration Iteration 1.
IDC Re-Engineering Phase 2 Iteration E2 Use Case Realizations Version 1.2.
Hamlet, Benjamin R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Harris, James M. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Burns, John F. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lober, Randall R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Vickers, James Wallace [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2016-12-01
This document contains 4 use case realizations generated from the model contained in Rational Software Architect. These use case realizations are the current versions of the realizations originally delivered in Elaboration Iteration 2.
Design and Realization of Avionics Integration Simulation System Based on RTX
Wang Liang
2016-01-01
Full Text Available Aircraft avionics system becoming more and more complicated, it is too hard to test and verify real avionics systems. A design and realization method of avionics integration simulation system based on RTX was brought forward to resolve the problem. In this simulation system, computer software and hardware resources were utilized entirely. All kinds of aircraft avionics system HIL (hardware-in-loop simulations can be implemented in this platform. The simulation method provided the technical foundation of testing and verifying real avionics system. The research has recorded valuable data using the newly-developed method. The experiment results prove that the avionics integration simulation system was used well in some helicopter avionics HIL simulation experiment. The simulation experiment results provided the necessary judgment foundation for the helicopter real avionics system verification.
FPGA realization of Farrow structure for sampling rate change
Marković Bogdan
2016-01-01
Full Text Available In numerous implementations of modern telecommunications and digital audio systems there is a need for sampling rate change of the system input signal. When the relation between signal input and output sampling frequencies is a fraction of two large integer numbers, Lagrange interpolation based on Farrow structure can be used for the efficient realization of the resample block. This paper highlights efficient realization and estimation of necessary resources for polynomial cubic Lagrange interpolation in the case of the demand for the signal sampling rate change with the factor 160/147 on Field-Programmable Gate Array architecture (FPGA. [Projekat Ministarstva nauke Republike Srbije, br. TR-32023 i br. TR-32028
Simulation and Experimental Realization of Multi-Scroll Chaotic Oscillators
E. T. Cuautle
2013-09-01
Full Text Available This article shows the simulation and experimental realization of a multi-scroll chaotic oscillator based on saturated nonlinear function (SNLF series. First, the simulation is performed by MATLAB using the mathematical description of the oscillator. At this step, it is shown how to increase the number of scrolls by augmenting the SNLF. Second, the mathematical description is implemented with electronic devices and simulated by using the behavioral model of commercially available operational amplifiers. The circuit simulation of the multi-scroll chaotic oscillator is performed showing how to generate even and odd number of scrolls. Finally, the simulated circuit is realized experimentally and the results confirm good agreement with theoretical simulations.
Algebraic proof and application of Lumley's realizability triangle
Gerolymos, G A
2016-01-01
Lumley [Lumley J.L.: Adv. Appl. Mech. 18 (1978) 123--176] provided a geometrical proof that any Reynolds-stress tensor $\\overline{u_i'u_j'}$ (indeed any tensor whose eigenvalues are invariably nonnegative) should remain inside the so-called Lumley's realizability triangle. An alternative formal algebraic proof is given that the anisotropy invariants of any positive-definite symmetric Cartesian rank-2 tensor in the 3-D Euclidian space $\\mathbb{E}^3$ define a point which lies within the realizability triangle. This general result applies therefore not only to $\\overline{u_i'u_j'}$ but also to many other tensors that appear in the analysis and modeling of turbulent flows. Typical examples are presented based on DNS data for plane channel flow.
Realized Jump Risk and Equity Return in China
Guojin Chen
2014-01-01
Full Text Available We utilize the realized jump components to explore a new jump (including nonsystematic jump and systematic jump risk factor model. After estimating daily realized jumps from high-frequency transaction data of the Chinese A-share stocks, we calculate monthly jump size, monthly jump standard deviation, and monthly jump arrival rate and then use those monthly jump factors to explain the return of the following month. Our empirical results show that the jump tail risk can explain the equity return. For the large capital-size stocks, large cap stock portfolios, and index, one-month lagged jump risk factor significantly explains the asset return variation. Our results remain the same even when we add the size and value factors in the robustness tests.
Realization of a cryogenic interface to an ultracold atomic chamber
Date, Aditya; Wang, Ke; Shaffer, Airlia; Patil, Yogesh Sharad; Schwab, Keith; Vengalattore, Mukund
2016-05-01
The control and manipulation of ultracold atoms in close proximity to cryogenic material surfaces opens up novel avenues for quantum sensing with cold atoms. However, integrating cryogenics with cold atomic systems presents the dual challenges of reducing thermal radiation load while allowing optimal optical access. Here, we present the realization of a unique interface between a cryogenic system and a room-temperature ultracold atomic chamber which allows for the optical trapping of cold atoms within microns of a sub-10 K cryogenic surface. Our interface serves as a platform for a cold-atoms based precision magnetic microscope for probing exotic condensed matter systems such as correlated electronic materials, as well as a platform for the realization of hybrid quantum systems. This work is supported by the DARPA QuASAR program through a grant from the ARO.
RESEARCH OF PROBLEMS ON REALIZING DIRECT ALGORITHM OF WAVELET TRANSFORM
无
2003-01-01
Direct algorithm of wavelet transform (WT) is the numerical algorithm obtained from the integral formula of WT by directly digitization.Some problems on realizing the algorithm are studied.Some conclusions on the direct algorithm of discrete wavelet transform (DWT), such as discrete convolution operation formula of wavelet coefficients and wavelet components, sampling principle and technology to wavelets, deciding method for scale range of wavelets, measures to solve edge effect problem, etc, are obtained.The realization of direct algorithm of continuous wavelet transform (CWT) is also studied.The computing cost of direct algorithm and Mallat algorithm of DWT are still studied, and the computing formulae are obtained.These works are beneficial to deeply understand WT and Mallat algorithm.Examples in the end show that direct algorithm can also be applied widely.
Electronic realization of the fractional-order systems
Františka Dorčáková
2007-10-01
Full Text Available This article is devoted to the electronic (analogue realization of the fractional-order systems – controllers or controlled objects whose we earlier used, identified, and analyzed as a mathematical models only ��� namely a fractional-order differential equation, and solved numerically using a method based on the truncated version of the Grunwald - Letnikov formula for fractional derivative. The electronic realization of the fractional derivative is based on the continued fraction expansion of the rational approximation of the fractional differentiator from which we obtained the values of the resistors and capacitors of the electronic circuit. Along with the mathematical description are presented also simulation and measurement results.
On realization of equal election for farmers in China
CHENG Naisheng
2007-01-01
With the election rights of farmers, there exists inequality not only in practice but also in legislation. How do we view such inequality? We do not think that such inequality is entirely the result of artificiality. It depends on the historical status of farmers, especially the level of the productive forces they represent. In China, provided the majority of the residents are farmers, who are small individual farmers, it is plausible that farmers cannot acquire the equal election rights in legislation. However, we shall create conditions for actively promoting the realization of farmers' equal election rights in legislation. The day when the majority of farmers become the producers and operators of commodities will be the time when farmers in China realize their equal election rights in legislation.
A thermoelectric power generating heat exchanger: Part I - Experimental realization
Bjørk, R; Pryds, N; Lindeburg, N; Viereck, P
2016-01-01
An experimental realization of a heat exchanger with commercial thermoelectric generators (TEGs) is presented. The power producing capabilities as a function of flow rate and temperature span are characterized for two different commercial heat transfer fluids and for three different thermal interface materials. The device is shown to produce 2 W per TEG or 0.22 W cm$^{-2}$ at a fluid temperature difference of 175 $^\\circ$C and a flow rate per fluid channel of 5 L min$^{-1}$. One experimentally realized design produced 200 W in total from 100 TEGs. For the design considered here, the power production is shown to depend more critically on the fluid temperature span than on the fluid flow rate. Finally, the temperature span across the TEG is shown to be 55% to 75% of the temperature span between the hot and cold fluids.
A photospectrometer realized in a standard integrated circuit process
Simpson, M.L.; Dress, W.B.; Ericson, M.N.; Jellison, G.E.; Sitter, D.N.; Wintenberg, A.L. [Oak Ridge National Laboratory, P.O. Box 2008, MS 6006, Oak Ridge, Tennessee37831-6006 (United States); French, D.F. [Department of Electrical Engineering, Ferris Hall, University of Tennessee, Knoxville, Tennessee 37996-2100 (United States)
1998-02-01
A photospectrometer has been realized in a standard integrated circuit (IC) process. Only the masks, materials, and fabrication steps inherent to this IC process were used (i.e., no post processing to add mechanical or optical devices for filtering). The spectrometer was composed of a set of 18 photodetectors with independent spectral responses. The responses of these devices were weighted and summed to form outputs proportional to the input optical power in discrete wavelength bands in the region from {approximately}400 to {approximately}1100nm. With the solution space restricted to a 60 nm band, this instrument could resolve Gaussian input spectra ({sigma}=5nm) with a peak-to-peak spacing of less than 15 nm. This device could easily be integrated with additional analog, digital, or wireless circuits to realize a true laboratory instrument on-a-chip. {copyright} {ital 1998 American Institute of Physics.}
Modeling daily realized futures volatility with singular spectrum analysis
Thomakos, Dimitrios D.; Wang, Tao; Wille, Luc T.
2002-09-01
Using singular spectrum analysis (SSA), we model the realized volatility and logarithmic standard deviations of two important futures return series. The realized volatility and logarithmic standard deviations are constructed following the methodology of Andersen et al. [J. Am. Stat. Ass. 96 (2001) 42-55] using intra-day transaction data. We find that SSA decomposes the volatility series quite well and effectively captures both the market trend (accounting for about 34-38% of the total variance in the series) and, more importantly, a number of underlying market periodicities. Reliable identification of any periodicities is extremely important for options pricing and risk management and we believe that SSA can be a useful addition to the financial practitioners’ toolbox.
Experimental Realization of an Achromatic Magnetic Mirror based on Metamaterials
Pisano, Giampaolo; Tucker, Carole
2016-01-01
Our work relates to the use of metamaterials engineered to realize a meta-surface approaching the exotic properties of an ideal object not observed in nature, a "magnetic mirror". Previous realizations were based on resonant structures which implied narrow bandwidths and large losses. The working principle of our device is ideally frequency-independent, it does not involve resonances and it does not rely on a specific technology. The performance of our prototype, working at millimetre wavelengths, has never been achieved before and it is superior to any other device reported in the literature, both in the microwave and optical regions. The device inherently has large bandwidth (144%), low losses (<1 %) and is almost independent of incidence-angle and polarization-state and thus approaches the behaviour of an ideal magnetic mirror. Applications of magnetic mirrors range from low-profile antennas, absorbers to optoelectronic devices. Our device can be realised using different technologies to operate in other...
Hardware Realization of Chaos-based Symmetric Video Encryption
Ibrahim, Mohamad A.
2013-05-01
This thesis reports original work on hardware realization of symmetric video encryption using chaos-based continuous systems as pseudo-random number generators. The thesis also presents some of the serious degradations caused by digitally implementing chaotic systems. Subsequently, some techniques to eliminate such defects, including the ultimately adopted scheme are listed and explained in detail. Moreover, the thesis describes original work on the design of an encryption system to encrypt MPEG-2 video streams. Information about the MPEG-2 standard that fits this design context is presented. Then, the security of the proposed system is exhaustively analyzed and the performance is compared with other reported systems, showing superiority in performance and security. The thesis focuses more on the hardware and the circuit aspect of the system’s design. The system is realized on Xilinx Vetrix-4 FPGA with hardware parameters and throughput performance surpassing conventional encryption systems.
16×10Gb/s symmetric WDM-FOFDM-PON realization with colorless ONUs.
Lei, Cheng; Chen, Hongwei; Chen, Minghua; Xie, Shizhong
2011-08-01
A novel symmetric WDM-PON scheme with colorless ONU is proposed. The baseband 4-ASK Fast-OFDM signal is upconverted by an intermediate frequency carrier, reserving a frequency gap between the FOFDM signal and the optical carrier. After distributing different wavelengths to corresponding ONU by AWG, periodic BPFs are employed to extract the optical carriers for upstream transmission, achieving colorless ONUs. A WDM-PON system with 16 colorless ONUs is established, and 10-Gb/s symmetric transmission for each ONU is also realized. Experiment shows that the system tolerance to the intrachannel crosstalk is greatly improved when the crosstalk signal locates at relatively higher frequency band.
Interplay of magnetic responses in all-dielectric oligomers to realize magnetic Fano resonances
Hopkins, Ben; Miroshnichenko, Andrey E; Monticone, Francesco; Alù, Andrea; Kivshar, Yuri S
2016-01-01
We study the interplay between collective and individual optically-induced magnetic responses in quadrumers made of identical dielectric nanoparticles. Unlike their plasmonic counterparts, all-dielectric nanoparticle clusters are shown to exhibit multiple dimensions of resonant magnetic responses that can be employed for the realization of anomalous scattering signatures. We focus our analysis on symmetric quadrumers made from silicon nanoparticles and verify our theoretical results in proof-of-concept radio frequency experiments demonstrating the existence of a novel type of magnetic Fano resonance in nanophotonics.
COMMENT: Comment on 'Experimental realization of a first test of de Broglie Bohm theory'
Akhavan, O.; Golshani, M.
2004-09-01
In a recent paper, Brida et al (2002 J. Phys. B: At. Mol. Opt. Phys. 35 4751) reported the first experimental realization for testing of de Broglie-Bohm (dBB) theory against standard quantum mechanics (SQM), based on a suggested scheme presented in Golshani and Akhavan (2001 J. Phys. A: Math. Gen. 34 5259). However, some details of their experiment are not compatible with our suggestion. Therefore, their conclusion, in which the experimental data are in complete agreement with SQM but show some deviations from dBB predictions, cannot be considered as a final verdict.
Experimental setup and realization of thin film specimens for microtensile tests.
Malhaire, Christophe; Seguineau, Cédric; Ignat, Michel; Josserond, Charles; Debove, Laurent; Brida, Sebastiano; Desmarres, Jean-Michel; Lafontan, Xavier
2009-02-01
This paper describes a microtensile test system and the design as the realization of the samples dedicated to the tensile experiments. Two different technologies for the development of miniaturized specimens are detailed: self-standing tensile samples sustained by silicon frames and metal on polymer specimens obtained by laser cutting. The design of the samples has been optimized by means of finite element simulations. Aluminum beams with very large length on thickness ratio have been released from their silicon substrate using a standard etching process. Stress/strain curves are derived from experimental force/displacement values and discussed in terms of Young's modulus values and critical parameters (flow and rupture stresses).
The mathematical model realization algorithm of high voltage cable
2006-01-01
At mathematical model realization algorithm is very important to know the account order of necessary relations and how it presents. Depending of loads or signal sources connection in selected points of mathematical model its very important to know as to make the equations in this point that it was possible to determine all unknown variables in this point. The number of equations which describe this point must to coincide with number of unknown variables, and matrix which describes factor...
Towards an Improved Realization of the BIH Terrestrial Frame
Boucher, Claude; Altamimi, Zuheir
In order to redefine the BIH terrestrial system from 1984 onwards (to be known as BTS), a global adjustment has been carried out using, in addition to the ERP series, sets of coordinates of sites where space geodesy stations are operated. The model used in the analysis is recalled and the calculation realized for the BIH Annual Report for 1984 is described. The future maintenance as well as improvements of the BTS are also outlined.
Operational Semantic of Workflow Engine and the Realizing Technique
FU Yan-ning; LIU Lei; ZHAO Dong-fan; JIN Long-fei
2005-01-01
At present, there is no formalized description of the executing procedure of workflow models. The procedure of workflow models executing in workflow engine is described using operational semantic. The formalized description of process instances and activity instances leads to very clear structure of the workflow engine, has easy cooperation of the heterogeneous workflow engines and guides the realization of the workflow engine function. Meanwhile, the software of workflow engine has been completed by means of the formalized description.
Realization of an Ultrasensitive Heisenberg-Limited Interferometer
2006-07-31
used a Monte Carlo simulation program to examine the effect of losses on this highly nonlinear detection scheme, with its experimental imple...is below since many authors do not follow the 200 word limit 14. SUBJECT TERMS quantum optics, nonlinear optics, squeezed states, Heisenberg -limited...Programs 1001 N. Emmett St. P.O. Box 400195 Charlottesville, VA 22904 -4195 Realization of an Ultrasensitive Heisenberg -Limited Interferometer REPORT
Estimating Net Realizable Value for Distressed Real Estate
James D. Shilling; John D. Benjamin; Sirmans, C. F.
1990-01-01
This paper provides a framework for adjusting distressed real estate properties for liquidating discounts. We estimate the probability of receiving an offer on a property in any particular short interval of time. Our empirical evidence allows us to predict the average rate at which offers will occur in any particular interval of time. Further, it allows us to arrive at an estimate of net realizable value, adjusted for selling expenses.
MOF QVT grafiskas formas realizācija
Boroviks, Dmitrijs
2009-01-01
Maģistra darbā tiek realizēts MOF QVT Relational valodas grafiskais redaktors. Darbā galvenā uzmanība tiek pievērsta QVT Relational valodas redaktora būvei izmantojot transformācijas vadīto arhitektūru. Izveidoto redaktoru turpmāk varēs izmantot MOF QVT valodas izplatīšanai.
High swing CMOS realization for third generation current conveyor (CCIII)
Minaei, Shahram; Yıldız, Merih; Türköz, Sait; Kuntman, Hakan
2003-01-01
In this paper a new CMOS realization for third generation current conveyor (CCIII) is proposed. The proposed circuit provides high swing range at terminals X and Y. The circuit has low input impedances at terminals X and Y and high output impedance at terminals Z+ and Z-. The circuit has 180MHz -3dB cutoff frequency in voltage follower mode. SPICE simulation results using MIETEC 1.2 CMOS process model are given.
City marketing between a theoretical reflection and a practical realization
Jezek, Jiri
2011-01-01
The paper deals with theoretical and application problems of city marketing. It is based on a series of researches which have been worked mainly in the Czech Republic, Slovak Republic, Austria, Germany and in the Netherlands. At the same time it points out the specific conditions and sometimes also different interpretations of city marketing in the countries mentioned above. The paper also points the series of discrepancies between theoretical hypothesis and practical realization of city mark...
Hardware realization of chaos based block cipher for image encryption
Barakat, Mohamed L.
2011-12-01
Unlike stream ciphers, block ciphers are very essential for parallel processing applications. In this paper, the first hardware realization of chaotic-based block cipher is proposed for image encryption applications. The proposed system is tested for known cryptanalysis attacks and for different block sizes. When implemented on Virtex-IV, system performance showed high throughput and utilized small area. Passing successfully in all tests, our system proved to be secure with all block sizes. © 2011 IEEE.
Universal commutative operator algebras and transfer function realizations of polynomials
Jury, Michael T
2010-01-01
To each finite-dimensional operator space $E$ is associated a commutative operator algebra $UC(E)$, so that $E$ embeds completely isometrically in $UC(E)$ and any completely contractive map from $E$ to bounded operators on Hilbert space extends uniquely to a completely contractive homomorphism out of $UC(E)$. The unit ball of $UC(E)$ is characterized by a Nevanlinna factorization and transfer function realization. Examples related to multivariable von Neumann inequalities are discussed.
MOF QVT grafiskas formas realizācija
Boroviks, Dmitrijs
2009-01-01
Maģistra darbā tiek realizēts MOF QVT Relational valodas grafiskais redaktors. Darbā galvenā uzmanība tiek pievērsta QVT Relational valodas redaktora būvei izmantojot transformācijas vadīto arhitektūru. Izveidoto redaktoru turpmāk varēs izmantot MOF QVT valodas izplatīšanai.
High-quality Crystal Filter – Design and Realization
D. M. Dujković
2013-11-01
Full Text Available Analog oscillators and filters are still very important devices in modern telecommunication and measurement equipment. Quartz crystal units are used for high-quality oscillators and filters, due to their extremely stable resonant frequency and Q-factor. In this paper the design and realization of a high-quality bandpass quartz crystal filter with a possible application to antenna circuitry is described.
A Simple Realization of the Inverse Seesaw Mechanism
Dias, A G; da Silva, P S Rodrigues; Sampieri, A
2012-01-01
Differently from the canonical seesaw mechanism, which is grounded in grand unified theories, the inverse seesaw mechanism lacks a special framework that realizes it naturally. In this work we advocate that the 3-3-1 model with right-handed neutrinos has such an appropriate framework to accommodate the inverse seesaw mechanism. We also provide an explanation for the smallness of the $\\mu$ parameter and estimate the branching ratio for the rare lepton flavor violation process $\\mu \\rightarrow e\\gamma$.
Perturbative analysis of spectral singularities and their optical realizations
Mostafazadeh, Ali; Rostamzadeh, Saber
2012-01-01
We develop a perturbative method of computing spectral singularities of a Schrodinger operator defined by a general complex potential that vanishes outside a closed interval. These can be realized as zero-width resonances in optical gain media and correspond to a lasing effect that occurs at the threshold gain. Their time-reversed copies yield coherent perfect absorption of light that is also known as antilasing. We use our general results to establish the exactness of the nth-order perturbat...
Nonlinear realizations of the W$_{3}^{(2}$) algebra
Bellucci, S; Krivonos, S; Pashnev, A I
1994-01-01
In this letter we consider the nonlinear realizations of the classical Polyakov's algebra $W_3^{(2)}$. The coset space method and the covariant reduction procedure allow us to deduce the Boussinesq equation with interchanged space and evolution coordinates. By adding one more space coordinate and introducing two copies of the $W_3^{(2)}$ algebra, the same method yields the $sl(3,R)$ Toda lattice equations.
On realizations of exterior calculus with dN = 0
Abramov, V.
1998-11-01
We study realizations of the q-exterior calculus with exterior differential d satisfying d N = 0, N > 2 on the free associative algebra with one generator and on the generalized Clifford algebras. Analogs of the notions of connection and curvature are discussed in the case of the q-exterior calculus on the generalized Clifford algebra. We show that the q-exterior calculus on the free associative algebra with one generator is related to q-calculus on the braided line.
Dynamical realization of l-conformal Galilei algebra and oscillators
Galajinsky, Anton, E-mail: galajin@mph.phtd.tpu.ru [Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634050 Tomsk, Lenin Ave. 30 (Russian Federation); Masterov, Ivan, E-mail: masterov@mph.phtd.tpu.ru [Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634050 Tomsk, Lenin Ave. 30 (Russian Federation)
2013-01-11
The method of nonlinear realizations is applied to the l-conformal Galilei algebra to construct a dynamical system without higher derivative terms in the equations of motion. A configuration space of the model involves coordinates, which parametrize particles in d spatial dimensions, and a conformal mode, which gives rise to an effective external field. It is shown that trajectories of the system can be mapped into those of a set of decoupled oscillators in d dimensions.
逯行; 李芒; 贾楠; 李彩玲
2016-01-01
There are still many problems in the present online teaching of online school,e.g.single backward teaching mode,not taking advantage of network to construct learning community,lack of interaction between learners and teachers,etc.In order to deal with this situation,this study has constructed an online flipped classroom teaching mode in whole network space,and,on the basis of the existed flipped classroom teaching mode,has added three elements,namely,"phased network activity design","cooperative and effective learning experience",and "seamless online learning platform",and constructed teaching mode that suits online teaching.Taking "Jingying Class" of Beijing No.4 High School Online School as study object,this paper has collected the process data during curriculum implementation like students’learning record,teachers’feedback and students’ assessment,and analyzed the data collected.The research has found out that the new curriculum has many advantages in comparison with previous curriculums,for example,strengthening the function of technology in supporting students’ learning,increasing the interaction between teachers and students and among students,improving the social viscosity among students,and decreasing the dropout rates of online teaching classes.The online flipped classroom teaching mode in whole network space can provide reference for teaching mode reform of online education agency like online school,Open University,etc.%当下网校的在线教学存在很多问题，如教学模式单一落后，没有充分利用网络构建学习共同体，学习者与教师之间缺少交互等。针对这一情况，本研究构建了全网络空间中的在线翻转课堂教学模式，通过在已有翻转课堂教学模式的基础上，增加“阶段式网络活动设计”“合作且有效的学习经验”“无缝化网络学习平台”等三个要素，构建适合在线教学的教学模式。研究以北京四中网校的真实教学班“菁
The electrostatic Cryogenic Storage Ring CSR - Mechanical concept and realization
von Hahn, R.; Berg, F.; Blaum, K.; Crespo Lopez-Urrutia, J. R.; Fellenberger, F.; Froese, M.; Grieser, M.; Krantz, C.; Kühnel, K.-U.; Lange, M.; Menk, S.; Laux, F.; Orlov, D. A.; Repnow, R.; Schröter, C. D.; Shornikov, A.; Sieber, T.; Ullrich, J.; Wolf, A.; Rappaport, M.; Zajfman, D.
2011-12-01
A new and technologically challenging project, the electrostatic Cryogenic Storage Ring CSR, is presently under construction at the Max-Planck-Institute for Nuclear Physics in Heidelberg. Applying liquid helium cooling, the CSR, with 35 m circumference, will provide a low temperature environment of only a few Kelvin and an extremely high vacuum of better than 10 -13 mbar. To realize these conditions the mechanical design has been completed and now the first quarter section is in the construction phase. For the onion skin structure of the cryogenic system we have at the outer shell the cryostat chambers, realized by welded rectangular stainless steel frames with aluminum plates. The next two shells are fabricated as aluminum shields kept at 80 and 40 K. The inner vacuum chambers for the experimental vacuum consist of stainless steel chambers cladded with external copper sheets connected to the LHe lines for optimized thermal equilibration and cryopumping. Additional large surface 2 K units are installed for cryogenic pumping of H 2. The mechanical concepts and the realization will be presented in detail.
Boussinesq-type equations from nonlinear realizations of $W_3$
Ivanov, E; Malik, R P
1993-01-01
We construct new coset realizations of infinite-dimensional linear $W_3^{\\infty}$ symmetry associated with Zamolodchikov's $W_3$ algebra which are different from the previously explored $sl_3$ Toda realization of $W_3^{\\infty}$. We deduce the Boussinesq and modified Boussinesq equations as constraints on the geometry of the corresponding coset manifolds.The main characteristic features of these realizations are:i. Among the coset parameters there are the space and time coordinates $x$ and $t$ which enter the Boussinesq equations, all other coset parameters are regarded as fields depending on these coordinates;ii. The spin 2 and 3 currents of $W_3$ and two spin 1 $U(1)$ Kac- Moody currents as well as two spin 0 fields related to the $W_3$currents via Miura maps, come out as the only essential parameters-fields of these cosets. The remaining coset fields are covariantly expressed through them;iii.The Miura maps get a new geometric interpretation as $W_3^{\\infty}$ covariant constraints which relate the above fie...
ABOUT FORMS OF REALIZATION OF THE FUNCTIONS OF THE STATE
Novikova A. S.
2015-11-01
Full Text Available The article is devoted to consideration of questions of functions of the state and forms of their realization, which are of very great importance in the theory of the state and practice of its functioning. It can be explained with the next moments, first, to that in functions are shown essence of the state, its social appointment. The state representing the phenomenon of social life, it is characterized by extraordinary variety of directly observable and perceived manifestations. It is defined as a variety of the tasks solved by the state in various areas of life of society, and a variety of bodies, forms, methods and means of implementation of the state activity. In this regard studying of functions serves as the prerequisite of knowledge of the main thing and defining in the state. Secondly, functions of the state define its structure, i.e. ways, regularities of the organization of elements of the state as difficult system. Research of functions of the state and forms of their realization helps to estimate its opportunities, promotes deeper understanding of the mechanism of its interaction with other structures of society in the solution of the most important political, economic, social, ecological, cultural and other tasks. The correct establishment of functions of the state and definition of forms of realization of these functions promotes stabilization of the public relations and development of society in various spheres
Hamiltonian realization of power system dynamic models and its applications
2008-01-01
Power system is a typical energy system. Because Hamiltonian approaches are closely related to the energy of the physical system, they have been widely re-searched in recent years. The realization of the Hamiltonian structure of the nonlinear dynamic system is the basis for the application of the Hamiltonian methods. However, there have been no systematically investigations on the Ham-iltonian realization for different power system dynamic models so far. This paper researches the Hamiltonian realization in power systems dynamics. Starting from the widely used power system dynamic models, the paper reveals the intrinsic Hamiltonian structure of the nonlinear power system dynamics and also proposes approaches to formulate the power system Hamiltonian structure. Furthermore, this paper shows the application of the Hamiltonian structure of the power system dynamics to design non-smooth controller considering the nonlinear ceiling effects from the real physical limits. The general procedure to design controllers via the Hamiltonian structure is also summarized in the paper. The controller design based on the Hamiltonian structure is a completely nonlinear method and there is no lin-earization during the controller design process. Thus, the nonlinear characteristics of the dynamic system are completely kept and fully utilized.
Hamiltonian realization of power system dynamic models and its applications
MA Jin; MEI ShengWei
2008-01-01
Power system is a typical energy system. Because Hamiltonian approaches are closely related to the energy of the physical system, they have been widely re-searched in recent years. The realization of the Hamiltonian structure of the nonlinear dynamic system is the basis for the application of the Hamiltonian methods. However, there have been no systematically investigations on the Ham-iltonian realization for different power system dynamic models so far. This paper researches the Hamiltonian realization in power systems dynamics. Starting from the widely used power system dynamic models, the paper reveals the intrinsic Hamiltonian structure of the nonlinear power system dynamics and also proposes approaches to formulate the power system Hamiltonian structure. Furthermore, this paper shows the application of the Hemiltonian structure of the power system dynamics to design non-smooth controller considering the nonlinear ceiling effects from the real physical limits. The general procedure to design controllers via the Hamiltonian structure is also summarized in the paper. The controller design based on the Hamiltonian structure is a completely nonlinear method and there is no lin-earization during the controller design process. Thus, the nonlinear characteristics of the dynamic system are completely kept and fully utilized.
Tunable defect mode realized by graphene-based photonic crystal
Fu, Jiahui; Chen, Wan, E-mail: dhtyyobdc@126.com; Lv, Bo
2016-04-29
In this literature, we propose an active terahertz 1D photonic crystal, which consists of silicon layers and air layers. A graphene sheet is embedded at the interface between dielectric and air. Tunable photonic band gap is realized by changing the Fermi level of graphene. Transmission Matrix Method is utilized to explain the influence of the graphene layer. We also demonstrate that a dielectric slab attached with a thin sheet made of single-negative metamaterial acts like a pure dielectric slab with a thinner thickness. A tunable blue shift of the band gap can be realized by simply applying different chemical potentials on the graphene sheet. This feature can be utilized for the design of tunable high-gain antenna array and force generator in terahertz band. - Highlights: • A novel PhC embedded with grapheme sheets is presented, tunable defect is realized. • The mechanism of the tunable defect is explained using the change of equivalent thickness. • The electromagnetic force of a slab is calculated, which indicates the structure can serve as a tunable force generator.
Interpreting a Classical Geometric Proof with Interactive Realizability
Giovanni Birolo
2013-09-01
Full Text Available We show how to extract a monotonic learning algorithm from a classical proof of a geometric statement by interpreting the proof by means of interactive realizability, a realizability sematics for classical logic. The statement is about the existence of a convex angle including a finite collections of points in the real plane and it is related to the existence of a convex hull. We define real numbers as Cauchy sequences of rational numbers, therefore equality and ordering are not decidable. While the proof looks superficially constructive, it employs classical reasoning to handle undecidable comparisons between real numbers, making the underlying algorithm non-effective. The interactive realizability interpretation transforms the non-effective linear algorithm described by the proof into an effective one that uses backtracking to learn from its mistakes. The effective algorithm exhibits a "smart" behavior, performing comparisons only up to the precision required to prove the final statement. This behavior is not explicitly planned but arises from the interactive interpretation of comparisons between Cauchy sequences.
A first theoretical realization of honeycomb topological magnon insulator
Owerre, S. A.
2016-09-01
It has been recently shown that in the Heisenberg (anti)ferromagnet on the honeycomb lattice, the magnons (spin wave quasipacticles) realize a massless two-dimensional (2D) Dirac-like Hamiltonian. It was shown that the Dirac magnon Hamiltonian preserves time-reversal symmetry defined with the sublattice pseudo spins and the Dirac points are robust against magnon-magnon interactions. The Dirac points also occur at nonzero energy. In this paper, we propose a simple realization of nontrivial topology (magnon edge states) in this system. We show that the Dirac points are gapped when the inversion symmetry of the lattice is broken by introducing a next-nearest neighbour Dzyaloshinskii-Moriya (DM) interaction. Thus, the system realizes magnon edge states similar to the Haldane model for quantum anomalous Hall effect in electronic systems. However, in contrast to electronic spin current where dissipation can be very large due to Ohmic heating, noninteracting topological magnons can propagate for a long time without dissipation as magnons are uncharged particles. We observe the same magnon edge states for the XY model on the honeycomb lattice. Remarkably, in this case the model maps to interacting hardcore bosons on the honeycomb lattice. Quantum magnetic systems with nontrivial magnon edge states are called topological magnon insulators. They have been studied theoretically on the kagome lattice and recently observed experimentally on the kagome magnet Cu(1-3, bdc) with three magnon bulk bands. Our results for the honeycomb lattice suggests an experimental procedure to search for honeycomb topological magnon insulators within a class of 2D quantum magnets and ultracold atoms trapped in honeycomb optical lattices. In 3D lattices, Dirac and Weyl points were recently studied theoretically, however, the criteria that give rise to them were not well-understood. We argue that the low-energy Hamiltonian near the Weyl points should break time-reversal symmetry of the pseudo spins
HERBAL PRODUCT REALIZATION IN ACCORDANCE WITH WHO AND ISO GUIDELINES
S. J. Ameh et al
2012-10-01
Full Text Available Background: Following the Alma-Ata Declaration of 1978, the World Health Organization (WHO began the issuance of guidelines for developing standardized herbal preparations from Traditional Medicine (TM. Similarly in 1987, the International Organization for Standardization (ISO launched the most anticipated industrial standard (ISO 9001 in world history. The seventh (7th clause of ISO 9001’s eight clauses is devoted to “Product Realization”- a quality management system (QMS procedure that includes: planning of product realization; appreciation of customer-related processes; design and development processes; purchasing; production and service provision; and control of measuring and monitoring equipment. Purpose: The article takes a hard look at the QMS processes involved in product realization and the critical stages of the WHO model of herbal drug development from TM, with a view to devising a framework that can be used to promote the production of quality herbal products, commencing from the stage of ethnobotanical survey, through the laboratory, to the clinic.Methodology: Both the WHO model of herbal drug development and the 7th clause of ISO 9001:2008 were critically reviewed and combined to yield a framework that is discussed within the context of guiding herbal drug development from TM. Results and Discussion: The resulting WHO-ISO framework of herbal product realization is discussed in terms of its relevance to practical problems of GMP-production using herbal starting materials, given their innate variability in composition, potency and appearance. Conclusion: The provisions of ISO 9001’s seventh clause can, to a large extent, be applied to the production of quality herbal products developed in accordance with WHO.
Realization of a Dual Transmission Band Conjugate Omega Shaped Metamaterial
Asit Kumar Panda
2011-11-01
Full Text Available In this article we propose a new conjugate omega shaped structure for realization of left hand material. This new metamaterial (MTM is designed and simulated using CST MWS. The effective permittivity permeability are extracted from the transmission reflection data obtained by normal incident on the purposed structure. It is shown the purposed MTM exhibits DNG material property and negative refractive index in dual transmission band with wider band in frequency ranges from 3.35-6.37GHz and 12.53-16.7GHZ. The conjugate omegas structures are pseudo-chiral in nature, where both electric magnetic polarization are due to induced electric and magnetic fields.
Associative memory realized by a reconfigurable memristive Hopfield neural network.
Hu, S G; Liu, Y; Liu, Z; Chen, T P; Wang, J J; Yu, Q; Deng, L J; Yin, Y; Hosaka, Sumio
2015-06-25
Although synaptic behaviours of memristors have been widely demonstrated, implementation of an even simple artificial neural network is still a great challenge. In this work, we demonstrate the associative memory on the basis of a memristive Hopfield network. Different patterns can be stored into the memristive Hopfield network by tuning the resistance of the memristors, and the pre-stored patterns can be successfully retrieved directly or through some associative intermediate states, being analogous to the associative memory behaviour. Both single-associative memory and multi-associative memories can be realized with the memristive Hopfield network.
Design and Realization of Cloth Order System on Mobile Internet
ZHANG Li; SHAO Shi-huang; ZENG Xian-hui; PU Fang; YIN Mei-hua
2002-01-01
Based on the analysis of developing target, function and constitution of cloth order system under wap gateway,the mobile communication principle of cloth order system under wap gateway is given out. The implementation method for information commnication of cloth order system are elaborated by using programming technology of active server page (ASP)3.0 and wireless markup language (WML). The browsing and inquiry of cloth information, sending and receiving of cloth order can be easily realized by the developed order system on mobile internet according to user's requirements.
Network realization of triplet-type quantum stochastic systems
Zhou, Shaosheng; Fu, Shizhou; Chen, Yuping
2017-01-01
This paper focuses on a problem of network synthesis for a class of quantum stochastic systems. The systems under consideration are of triplet-type form and stem from linear quantum optics and linear quantum circuits. A new quantum network realization approach is proposed by generalizing the scattering operator from the scalar form to a unitary matrix in network components. It shows that the triplet-type quantum stochastic system can be approximated by a quantum network which consists of some one-degree-of-freedom generalized open-quantum harmonic oscillators (1DGQHOs) via series, concatenation and feedback connections.
Realization of an all optical exciton-polariton router
Marsault, Félix; Nguyen, Hai Son; Tanese, Dimitrii; Lemaître, Aristide; Galopin, Elisabeth; Sagnes, Isabelle; Amo, Alberto [Laboratoire de Photonique et de Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis (France); Bloch, Jacqueline, E-mail: jacqueline.bloch@lpn.cnrs.fr [Laboratoire de Photonique et de Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis (France); Physics Department, Ecole Polytechnique, F-91128 Palaiseau Cedex (France)
2015-11-16
We report on the experimental realization of an all optical router for exciton-polaritons. This device is based on the design proposed by Flayac and Savenko [Appl. Phys. Lett. 103, 201105 (2013)], in which a zero-dimensional island is connected through tunnel barriers to two periodically modulated wires of different periods. Selective transmission of polaritons injected in the island, into either of the two wires, is achieved by tuning the energy of the island state across the band structure of the modulated wires. We demonstrate routing of ps polariton pulses using an optical control beam which controls the energy of the island quantum states, thanks to polariton-exciton interactions.
Geometric Realizations of Bi-Hamiltonian Completely Integrable Systems
Gloria Marí Beffa
2008-03-01
Full Text Available In this paper we present an overview of the connection between completely integrable systems and the background geometry of the flow. This relation is better seen when using a group-based concept of moving frame introduced by Fels and Olver in [Acta Appl. Math. 51 (1998, 161-213; 55 (1999, 127-208]. The paper discusses the close connection between different types of geometries and the type of equations they realize. In particular, we describe the direct relation between symmetric spaces and equations of KdV-type, and the possible geometric origins of this connection.
Chaotic memristive circuit: equivalent circuit realization and dynamical analysis
Bao Bo-Cheng; Xu Jian-Ping; Zhou Guo-Hua; Ma Zheng-Hua; Zou Ling
2011-01-01
In this paper,a practical equivalent circuit of an active flux-controlled memristor characterized by smooth piecewise-quadratic nonlinearity is designed and an experimental chaotic memristive circuit is implemented.The chaotic memristive circuit has an equilibrium set and its stability is dependent on the initial state of the memristor.The initial state-dependent and the circuit parameter-dependent dynamics of the chaotic memristive circuit are investigated via phase portraits,bifurcation diagrams and Lyapunov exponents.Both experimental and simulation results validate the proposed equivalent circuit realization of the active flux-controlled memristor.
Abelian realization of phenomenological two-zero neutrino textures
González Felipe, R., E-mail: ricardo.felipe@ist.utl.pt [Instituto Superior de Engenharia de Lisboa – ISEL, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa (Portugal); Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa (Portugal); Serôdio, H., E-mail: hugo.serodio@ific.uv.es [Departament de Física Teòrica and IFIC, Universitat de València-CSIC, E-46100 Burjassot (Spain)
2014-09-15
In an attempt at explaining the observed neutrino mass-squared differences and leptonic mixing, lepton mass matrices with zero textures have been widely studied. In the weak basis where the charged lepton mass matrix is diagonal, various neutrino mass matrices with two zeros have been shown to be consistent with the current experimental data. Using the canonical and Smith normal form methods, we construct the minimal Abelian symmetry realizations of these phenomenological two-zero neutrino textures. The implementation of these symmetries in the context of the seesaw mechanism for Majorana neutrino masses is also discussed.
Realization of Matrix Electric Power Conversion with Practicality
杨喜军; 雷淮刚; 等
2002-01-01
A realization of three phase to three phase matrix electric power converter(33MC) with practicality is depicted,which is characteristic of modular configuration,simple and safe and semi-natural semi-forced two-step commutation strategy,general over-current protection circuit,flexible generalized switching functions,combined bilateral power swotches,and so on.A new approach to manufacturing-oriented 33MC comes forth,which is composed of 3 modular three phase to sigle phase non-square matrix electric power converters(31MC).
Space bandwidth-efficient realizations of linear systems.
Kutay, M A; Erden, M F; Ozaktas, H M; Arkan, O; Güleryüz, O; Candan, C A
1998-07-15
One can obtain either exact realizations or useful approximations of linear systems or matrix-vector products that arise in many different applications by implementing them in the form of multistage or multichannel fractional Fourier-domain filters, resulting in space-bandwidth-efficient systems with acceptable decreases in accuracy. Varying the number and the configuration of filters enables one to trade off between accuracy and efficiency in a flexible manner. The proposed scheme constitutes a systematic way of exploiting the regularity or structure of a given linear system or matrix, even when that structure is not readily apparent.
Practical realization of a microwave Bessel beam launcher
Manzhura, Oksana
2011-08-01
An experimental setup is realized to practically generate Bessel beams in the microwave regime. The setup, which consists of a series of circular loop antennas inserted coaxially inside a circular metallic waveguide, excites the waveguide\\'s transverse-electric modes such that their superposition forms a Bessel beam at the open-end of the waveguide. The excitation currents are calculated from the needed excitation coefficients of each guided mode, which, in turn, are calculated from the modal decomposition of the beam. The efficiency of the setup is evaluated and the obtained experimental results are compared to the theoretical estimates. © 2011 IEEE.
Realizing quantum controlled phase flip through cavity QED
Xiao, Yun-Feng; Lin, Xiu-Min; Gao, Jie; Yang, Yong; Han, Zheng-Fu; Guo, Guang-Can
2004-10-01
We propose a scheme to realize quantum controlled phase flip (CPF) between two rare-earth ions embedded in the respective microsphere cavity via interacting with a single-photon pulse in sequence. The numerical simulations illuminate that the CPF gate between ions is robust and scalable with extremely high fidelity and low error rate. Our scheme is more applicable than other schemes presented before based on current laboratory cavity-QED technology, and it is possible to be used as an applied unit gate in future quantum computation and quantum communication.
Realizing Quantum Controlled Phase Flip through Cavity-QED
Xiao, Y F; Gao, J; Yang, Y; Han, Z F; Guo, G C; Xiao, Yun-Feng; Lin, Xiu-Min; Gao, Jie; Yang, Yong; Han, Zheng-Fu; Guo, Guang-Can
2004-01-01
We propose a scheme to realize quantum controlled phase flip (CPF) between two rare earth ions embedded in respective microsphere cavity via interacting with a single-photon pulse in sequence. The numerical simulations illuminate that the CPF gate between ions is robust and scalable with extremely high fidelity and low error rate. Our scheme is more applicable than other schemes presented before based on current laboratory cavity-QED technology, and it is possible to be used as an applied unit gate in future quantum computation and quantum communication.
Mixed motives and their realization in derived categories
Huber, Annette
1995-01-01
The conjectural theory of mixed motives would be a universal cohomology theory in arithmetic algebraic geometry. The monograph describes the approach to motives via their well-defined realizations. This includes a review of several known cohomology theories. A new absolute cohomology is introduced and studied. The book assumes knowledge of the standard cohomological techniques in algebraic geometry as well as K-theory. So the monograph is primarily intended for researchers. Advanced graduate students can use it as a guide to the literature.
Complete Localization of HVDC Back-to-Back Project Realized
Yu Xinqiang; Liang Xuming; Wang Zuli; Ye Qing
2006-01-01
The first completely localized DC back-to-back project for asynchronous interconnection between Northwest and Central China plays an important role in realizing national power grid interconnection, spurring indigenous manufacturing industries and promoting DC transmission equipment. Insisting on the principle of autonomous innovation, this project was based on domestic forces in every aspect, from engineering organization, system design, equipment completion, engineering design, equipment manufacturing and procurement to construction and debugging. By passing through strict quality control, intermediate supervision and acceptance test and assessment, the project has been proved up to world advanced level.
Design and Realization of Liquid Stub Tuner Control System
Pan Yaping(潘亚平); R. Kumazawa; T. Seki; Wang Lei(王磊); ZhaoYanping(赵燕平); Qin Chengmin(秦成明); Xue Diye(薛迪冶); Deng Xu(邓旭); Mao Yuzhou(毛玉周); Ding Jiayi(丁家义); T. Watari
2004-01-01
In microwave circuit and aerial system, impedance matching is very important.Liquid stub tuner is a new type of impedance matching device. In the HT-7 Tokamak Ion Cyclotron Resonance Heating ( ICRH ) system, we have already adopted liquid stub tuner to replace the conventional stub tuner. It is urgent to develop a control system of the liquid stub tuner.This paper mainly introduces the design and realization of the liquid stub tuner control system ,and briefly introduces its three controlling functions: local control, remote control and computer control.
Beam Polarization at the ILC: Physics Case and Realization
Vauth, Annika; List, Jenny
2016-02-01
The International Linear Collider (ILC) is a proposed e+e- collider, focused on precision measurement of the Standard Model and new physics beyond. Polarized beams are a key element of the ILC physics program. The physics studies are accompanied by an extensive R&D program for the creation of the polarized beams and the measurement of their polarization. This contribution will review the advantages of using beam polarization and its technical aspects and realization, such as the creation of polarized beams and the measurement of the polarization.
Direct-write graded index materials realized in protein hydrogels
Kaehr, Bryan; Scrymgeour, David A.
2016-09-01
The ability to create optical materials with arbitrary index distributions would prove transformative for optics design and applications. However, current fabrication techniques for graded index (GRIN) materials rely on diffusion profiles and therefore are unable to realize arbitrary distribution GRIN design. Here, we demonstrate the laser direct writing of graded index structures in protein-based hydrogels using multiphoton lithography. We show index changes spanning a range of 10-2, which is comparable with laser densified glass and polymer systems. Further, we demonstrate the conversion of these written density variation structures into SiO2, opening up the possibility of transforming GRIN hydrogels to a wide range of material systems.
Quantum mechanics: Thought experiments made real
Martín, Fernando
2015-02-01
Elegant experiments performed with X-rays and a double slit formed from molecular oxygen have finally made it possible to realize and test a long-standing and famous gedanken experiment in quantum mechanics.
Population dynamics in a Floquet realization of the Harper-Hofstadter Hamiltonian
Bilitewski, Thomas; Cooper, Nigel R.
2015-06-01
We study a Floquet realization of the Harper-Hofstadter model that has recently been implemented in a gas of cold bosonic atoms. We study in detail the scattering processes in this system in the weakly interacting regime due to the interplay of particle interactions and the explicit time dependence of the Floquet states that lead to band transitions and heating. We focus on the experimentally used parameters and explicitly model the transverse confining direction. Based on transition rates computed within the Floquet-Fermi golden rule we obtain band population dynamics which are in agreement with the dynamics observed in experiment. Finally, we discuss whether and how photon-assisted collisions that may be the source of heating and band population dynamics might be suppressed in the experimental setup by appropriate design of the transverse confining potential. The suppression of such processes will become increasingly important as experiments progress into simulating strongly interacting systems in the presence of artificial gauge fields.
Experimental realization of quantum algorithm for solving linear systems of equations
Pan, Jian; Cao, Yudong; Yao, Xiwei; Li, Zhaokai; Ju, Chenyong; Chen, Hongwei; Peng, Xinhua; Kais, Sabre; Du, Jiangfeng
2014-02-01
Many important problems in science and engineering can be reduced to the problem of solving linear equations. The quantum algorithm discovered recently indicates that one can solve an N-dimensional linear equation in O (logN) time, which provides an exponential speedup over the classical counterpart. Here we report an experimental demonstration of the quantum algorithm when the scale of the linear equation is 2×2 using a nuclear magnetic resonance quantum information processor. For all sets of experiments, the fidelities of the final four-qubit states are all above 96%. This experiment gives the possibility of solving a series of practical problems related to linear systems of equations and can serve as the basis to realize many potential quantum algorithms.
Vladlena V. Siganova
2012-05-01
Full Text Available The article characterizes major results of integrated linguo-rhetoric approach application to writer’s idiodiscourse (F.M. Dostoevsky’s ‘The Brothers Karamazov’ case study.
Morand, Ph.; Charlier, R.H.; Mazé, J.
1990-01-01
Proliferation of macroalgae is a world-wide problem with 50,000 m3 of drift Ulva harvested per year in Brittany and about 1.0 to 1.2 million tons growing in the Venice lagoon. This biomass may be treated by bioconversion (aerobic or anaerobic fermentation) to give useful products (gas, fertilizers or others) and to remove a source of environmental pollution. Such a treatment also may be applied to cultivated or harvested seaweds and to seaweed industry residues.Studies of seaweed methanizatio...
Hardware Realization of an FPGA Processor - Operating System Call Offload and Experiences
Hindborg, Andreas Erik; Karlsson, Sven
2014-01-01
core that can be integrated in many signal and data processing platforms on FPGAs. We also show how we allow the processor to use operating system services. For a set of SPLASH-2 and SPEC2006 benchmarks we show an speedup of up to 64% over a similar Xilinx MicroBlaze implementation while using 27...
Hardware Realization of an FPGA Processor – Operating System Call Offload and Experiences
Hindborg, Andreas Erik; Schleuniger, Pascal; Jensen, Nicklas Bo
2014-01-01
core that can be integrated in many signal and data processing platforms on FPGAs. We also show how we allow the processor to use operating system services. For a set of SPLASH-2 and SPEC CPU2006 benchmarks we show a speedup of up to 64% over a similar Xilinx MicroBlaze implementation while using 27...
Shikada, M.; Shiraishi, S.; Takeuchi, S.
2012-07-01
To obtain indoor positioning by using GPS (GNSS) satellite is difficult now. Additionally it is difficult to obtain high accuracy outdoor position when GPS receiver cannot find four or more GPS satellites in the viewing field of sky. The Japanese Government executed a new law NSDI (National Spatial Data Infrastructure) for a spatial information society on May 30, 2007. In this law, everybody can know positional information in real time, anytime and anywhere. In addition, it is necessary to use satellite positioning for realization of seamless positioning, and to promote ubiquitous network technology. Realization of advanced geospatial information society will achieve by creating condition which can obtain positional information anytime and anywhere. However, those technologies have not been established yet. Our laboratory conducted seamless positioning experiment to verify whether it can obtain position seamlessly by using VRS-GPS (Virtual Reference System-GPS) ,QZSS(LEX signal) and RFID (Radio Frequency Identification) for realizing an advanced spatial information society. Especially, QZSS was launched in 2010 by JAXA and is satellite system taken by a combination of multi orbit plane and each satellite deployed to appear constantly 1 satellite near the zenith in Japan. We are joining the demonstration experiment of a part of Hokuriku area in Japan at 5th to 9th in March and 23th to 27th in April 2012. In this paper we described advanced spatial information society will realize by a combination of GPS(GNSS),RFID and QZSS.
Individual Differences in the Potential and Realized Developmental Plasticity of Personality Traits
Judy eStamps
2014-10-01
Full Text Available Changes in personality over ontogeny can occur even when every agent (individual or genotype is exposed to the same set of cues, experiences or environmental conditions. A recent Bayesian model (Stamps and Krishnan, in press shows how individual differences in the means and variances of prior distributions of estimates of variables such as danger can generate predictable individual differences in behavioral developmental trajectories, and predictable changes in the differential consistency (broad-sense repeatability of behavior over ontogeny, even if every subject is reared and maintained under the same conditions. We use this model to highlight the distinction between potential plasticity (the ability of an agent to change its phenotype in response to different types of experience and realized plasticity (the extent to which an agent’s phenotype actually changes in response to a specific experience, and to demonstrate why the realized behavioral developmental plasticity of a given agent might vary as a function of the type of cues to which that agent was exposed over ontogeny. We describe two commonly used experimental protocols for studying individual differences in developmental plasticity (within-individual versus replicate individual designs, discuss the advantages and disadvantages of each for investigating individual differences in the developmental plasticity of personality traits, and explain why replicate individual designs provide better estimates than within-individual designs of the potential developmental plasticity of behavioral traits. More generally, we suggest that a Bayesian approach to development, especially one which assumes that individuals differ with respect to the information provided by their immediate and distant ancestors, can provide valuable insights into how genes, epigenetic factors, maternal effects and personal experiences might combine across the lifetime to affect the development of personality and other
Realization and characterization of fiber optic reflective sensor
Guzowski, B.; Łakomski, M.; Słapek, B.
2016-11-01
In almost all of non-invasive techniques, fiber optic sensors may be the most promising ones because of their inherent advantages such as very small size and hard environment tolerance. Proximity sensors based on optical fiber are highly required especially in the impact area of electromagnetic fields. In this paper three different types of fiber optic reflective sensors are presented. In all three types of the sensor four multimode optical fibers (MMF) illuminate the movable surface. The difference is in the number of collecting the reflected light MMF. In the first one, 12 MMF collect the light, in the second one 20 MMF, while in the third one the number of MMF collecting reflected light is 32. Moreover, all three types of fiber optic reflective sensors were realized in two configurations. In the first one, the cleaved MMF were used to collect reflected light, while in the second configuration - the ball-lensed optical fibers were chosen. In this paper an analysis of each type of realized sensor is presented. In the last part of this paper the obtained results and the detailed discussion are given.
Wakimoto realizations of current algebras an explicit construction
De Boer, J; Boer, Jan de; Feher, Laszlo
1997-01-01
A generalized Wakimoto realization of $\\widehat{\\cal G}_K$ can be associated with each parabolic subalgebra ${\\cal P}=({\\cal G}_0 +{\\cal G}_+)$ of a simple Lie algebra ${\\cal G}$ according to an earlier proposal by Feigin and Frenkel. In this paper the proposal is made explicit by developing the construction of Wakimoto realizations from a simple but unconventional viewpoint. An explicit formula is derived for the Wakimoto current first at the Poisson bracket level by Hamiltonian symmetry reduction of the WZNW model. The quantization is then performed by normal ordering the classical formula and determining the required quantum correction for it to generate $\\widehat{\\cal G}_K$ by means of commutators. The affine-Sugawara stress-energy tensor is verified to have the expected quadratic form in the constituents, which are symplectic bosons belonging to ${\\cal G}_+$ and a current belonging to ${\\cal G}_0$. The quantization requires a choice of special polynomial coordinates on the big cell of the flag manifold $...
Practical Quantum Realization of the Ampere from the Elementary Charge
Brun-Picard, J.; Djordjevic, S.; Leprat, D.; Schopfer, F.; Poirier, W.
2016-10-01
One major change of the future revision of the International System of Units is a new definition of the ampere based on the elementary charge e . Replacing the former definition based on Ampère's force law will allow one to fully benefit from quantum physics to realize the ampere. However, a quantum realization of the ampere from e , accurate to within 10-8 in relative value and fulfilling traceability needs, is still missing despite the many efforts made for the development of single-electron tunneling devices. Starting again with Ohm's law, applied here in a quantum circuit combining the quantum Hall resistance and Josephson voltage standards with a superconducting cryogenic amplifier, we report on a practical and universal programmable quantum current generator. We demonstrate that currents generated in the milliampere range are accurately quantized in terms of e fJ (fJ is the Josephson frequency) with measurement uncertainty of 10-8. This new quantum current source, which is able to deliver such accurate currents down to the microampere range, can greatly improve the current measurement traceability, as demonstrated with the calibrations of digital ammeters. In addition, it opens the way to further developments in metrology and in fundamental physics, such as a quantum multimeter or new accurate comparisons to single-electron pumps.
Analogue Realization of Fractional-Order Dynamical Systems
Ladislav Pivka
2013-10-01
Full Text Available As it results from many research works, the majority of real dynamical objects are fractional-order systems, although in some types of systems the order is very close to integer order. Application of fractional-order models is more adequate for the description and analysis of real dynamical systems than integer-order models, because their total entropy is greater than in integer-order models with the same number of parameters. A great deal of modern methods for investigation, monitoring and control of the dynamical processes in different areas utilize approaches based upon modeling of these processes using not only mathematical models, but also physical models. This paper is devoted to the design and analogue electronic realization of the fractional-order model of a fractional-order system, e.g., of the controlled object and/or controller, whose mathematical model is a fractional-order differential equation. The electronic realization is based on fractional-order differentiator and integrator where operational amplifiers are connected with appropriate impedance, with so called Fractional Order Element or Constant Phase Element. Presented network model approximates quite well the properties of the ideal fractional-order system compared with e.g., domino ladder networks. Along with the mathematical description, circuit diagrams and design procedure, simulation and measured results are also presented.
Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations
Ra'di, Y.; Simovski, C. R.; Tretyakov, S. A.
2015-03-01
With recent advances in nanophotonics and nanofabrication, considerable progress has been achieved in realizations of thin composite layers designed for full absorption of incident electromagnetic radiation, from microwaves to the visible. If the layer is structured at a subwavelength scale, thin perfect absorbers are usually called "metamaterial absorbers," because these composite structures are designed to emulate some material responses not reachable with any natural material. On the other hand, many thin absorbing composite layers were designed and used already in the time of the introduction of radar technology, predominantly as a means to reduce radar visibility of targets. In view of a wide variety of classical and new topologies of optically thin metamaterial absorbers and plurality of applications, there is a need for a general, conceptual overview of the fundamental mechanisms of full absorption of light or microwave radiation in thin layers. Here, we present such an overview in the form of a general theory of thin perfectly absorbing layers. Possible topologies of perfect metamaterial absorbers are classified based on their fundamental operational principles. For each of the identified classes, we provide design equations and give examples of particular realizations. The concluding section provides a summary and gives an outlook on future developments in this field.
No Quantum Realization of Extremal No-Signaling Boxes
Ramanathan, Ravishankar; Tuziemski, Jan; Horodecki, Michał; Horodecki, Paweł
2016-07-01
The study of quantum correlations is important for fundamental reasons as well as for quantum communication and information processing tasks. On the one hand, it is of tremendous interest to derive the correlations produced by measurements on separated composite quantum systems from within the set of all correlations obeying the no-signaling principle of relativity, by means of information-theoretic principles. On the other hand, an important ongoing research program concerns the formulation of device-independent cryptographic protocols based on quantum nonlocal correlations for the generation of secure keys, and the amplification and expansion of random bits against general no-signaling adversaries. In both these research programs, a fundamental question arises: Can any measurements on quantum states realize the correlations present in pure extremal no-signaling boxes? Here, we answer this question in full generality showing that no nontrivial (not local realistic) extremal boxes of general no-signaling theories can be realized in quantum theory. We then explore some important consequences of this fact.
Realizing Efficient Energy Harvesting from Organic Photovoltaic Cells
Zou, Yunlong
Organic photovoltaic cells (OPVs) are emerging field of research in renewable energy. The development of OPVs in recent years has made this technology viable for many niche applications. In order to realize widespread application however, the power conversion efficiency requires further improvement. The efficiency of an OPV depends on the short-circuit current density (JSC), open-circuit voltage (VOC) and fill factor (FF). For state-of-the-art devices, JSC is mostly optimized with the application of novel low-bandgap materials and a bulk heterojunction device architecture (internal quantum efficiency approaching 100%). The remaining limiting factors are the low VOC and FF. This work focuses on overcoming these bottlenecks for improved efficiency. Temperature dependent measurements of device performance are used to examine both charge transfer and exciton ionization process in OPVs. The results permit an improved understanding of the intrinsic limit for VOC in various device architectures and provide insight on device operation. Efforts have also been directed at engineering device architecture for optimized FF, realizing a very high efficiency of 8% for vapor deposited small molecule OPVs. With collaborators, new molecules with tailored desired energy levels are being designed for further improvements in efficiency. A new type of hybrid organic-inorganic perovskite material is also included in this study. By addressing processing issues and anomalous hysteresis effects, a very high efficiency of 19.1% is achieved. Moving forward, topics including engineering film crystallinity, exploring tandem architectures and understanding degradation mechanisms will further push OPVs toward broad commercialization.
Performance optimization of queueing systems with perturbation realization
Xia, Li
2012-04-01
After the intensive studies of queueing theory in the past decades, many excellent results in performance analysis have been obtained, and successful examples abound. However, exploring special features of queueing systems directly in performance optimization still seems to be a territory not very well cultivated. Recent progresses of perturbation analysis (PA) and sensitivity-based optimization provide a new perspective of performance optimization of queueing systems. PA utilizes the structural information of queueing systems to efficiently extract the performance sensitivity information from a sample path of system. This paper gives a brief review of PA and performance optimization of queueing systems, focusing on a fundamental concept called perturbation realization factors, which captures the special dynamic feature of a queueing system. With the perturbation realization factors as building blocks, the performance derivative formula and performance difference formula can be obtained. With performance derivatives, gradient-based optimization can be derived, while with performance difference, policy iteration and optimality equations can be derived. These two fundamental formulas provide a foundation for performance optimization of queueing systems from a sensitivity-based point of view. We hope this survey may provide some inspirations on this promising research topic. © 2011 Elsevier B.V. All rights reserved.
Experimental realization of a terahertz all-dielectric metasurface absorber.
Liu, Xinyu; Fan, Kebin; Shadrivov, Ilya V; Padilla, Willie J
2017-01-09
Metamaterial absorbers consisting of metal, metal-dielectric, or dielectric materials have been realized across much of the electromagnetic spectrum and have demonstrated novel properties and applications. However, most absorbers utilize metals and thus are limited in applicability due to their low melting point, high Ohmic loss and high thermal conductivity. Other approaches rely on large dielectric structures and / or a supporting dielectric substrate as a loss mechanism, thereby realizing large absorption volumes. Here we present a terahertz (THz) all dielectric metasurface absorber based on hybrid dielectric waveguide resonances. We tune the metasurface geometry in order to overlap electric and magnetic dipole resonances at the same frequency, thus achieving an experimental absorption of 97.5%. A simulated dielectric metasurface achieves a total absorption coefficient enhancement factor of FT=140, with a small absorption volume. Our experimental results are well described by theory and simulations and not limited to the THz range, but may be extended to microwave, infrared and optical frequencies. The concept of an all-dielectric metasurface absorber offers a new route for control of the emission and absorption of electromagnetic radiation from surfaces with potential applications in energy harvesting, imaging, and sensing.
Realization of the kilogram by the XRCD method
Fujii, Kenichi; Bettin, Horst; Becker, Peter; Massa, Enrico; Rienitz, Olaf; Pramann, Axel; Nicolaus, Arnold; Kuramoto, Naoki; Busch, Ingo; Borys, Michael
2016-10-01
When the kilogram is redefined in terms of the fixed numerical value of the Planck constant h, the x-ray-crystal-density (XRCD) method, among others, is used for realizing the redefined kilogram. The XRCD method has been used for the determination of the Avogadro constant N A by counting the number of atoms in a 28Si-enriched crystal, contributing to a substantial reduction of uncertainty in the values of N A and h to 2 parts in 108. This method can be therefore used reversely for the mass determination of a 1 kg sphere prepared from the crystal. This is realized by SI-traceable measurements of its lattice parameter, isotopic composition, volume, and surface properties. Details of the corresponding measurements are provided, as well as the concept of the XRCD method, isotope enrichment, crystal production, sphere manufacturing, and evaluation of impurities and self-point defects in the crystal, together with mass comparison with respect to the silicon sphere for disseminating mass standards.
YAG（编译）
2007-01-01
概述了日本惯性聚变项目的背景和各大项目的最新进展.主要有:1)日本大阪大学激光工程研究所和日本核聚变科学研究所核融合科学研究所(National Institute for Fusion Science,NIFS)联合运作的快点火实证计划项目(Fast Ignition Realization Experiment,FIREX)第一阶段;2)由NIFS运作的大型螺旋装置项目(Large Helical Device,LHD);3)日本原子力开发研究机构那珂核聚变研究所(Naka Fusion Institute,Japan Atomic Energy Agency)的JT-60托卡马克装置.
Joung, Wukchul; Gam, Kee Sool; Kim, Yong-Gyoo
2015-10-01
In this work, the freezing point of tin (Sn FP) was realized by inside nucleation where the supercooling of tin and the reheating of the sample after the nucleation were achieved without extracting the cell from an isothermal apparatus. To this end, a novel hydraulic temperature control technique, which was based on the thermo-hydraulic characteristics of a pressure-controlled loop heat pipe (LHP), was employed to provide a slow cooling of the sample for deep supercooling and fast reheating after nucleation to minimize the amount of initial freeze of the sample. The required temperature controls were achieved by the active pressure control of a control gas inside the compensation chamber of the pressure-controlled LHP, and slow cooling at -0.05 K min-1 for the deep supercooling of tin and fast heating at 2 K min-1 for reheating the sample after nucleation was attained. Based on this hydraulic temperature control technique, the nucleation of tin was realized at supercooling of around 19 K, and a satisfactorily fast reheating of the sample to the plateau-producing temperature (i.e. 0.5 K below the Sn FP) was achieved without any temperature overshoots of the isothermal region. The inside-nucleated Sn FP showed many desirable features compared to the Sn FP realized by the conventional outside nucleation method. The longer freezing plateaus and the better immersion characteristics of the Sn FP were obtained by inside nucleation, and the measured freezing temperature of the inside-nucleated Sn FP was as much as 0.37 mK higher than the outside-nucleated Sn FP with an expanded uncertainty of 0.19 mK. Details on the experiment are provided and explanations for the observed differences are discussed.
Popper's Experiment: A Modern Perspective
Tabish Qureshi
2012-11-01
Full Text Available Karl Popper had proposed an experiment to test the standard interpretation of quantum mechanics. The proposal survived for many year in the midst of no clear consensus on what results it would yield. The experiment was realized by Kim and Shih in 1999, and the apparently surprising result led to lot of debate. We review Popper's proposal and its realization in the light of current era when entanglement has been well studied, both theoretically and experimentally. We show that the "ghost-diffraction" experiment, carried out in a different context, conclusively resolves the controversy surrounding Popper's experiment.Quanta 2012; 1: 19–32.
Realizing exactly solvable SU (N ) magnets with thermal atoms
Beverland, Michael E.; Alagic, Gorjan; Martin, Michael J.; Koller, Andrew P.; Rey, Ana M.; Gorshkov, Alexey V.
2016-05-01
We show that n thermal fermionic alkaline-earth-metal atoms in a flat-bottom trap allow one to robustly implement a spin model displaying two symmetries: the Sn symmetry that permutes atoms occupying different vibrational levels of the trap and the SU (N ) symmetry associated with N nuclear spin states. The symmetries make the model exactly solvable, which, in turn, enables the analytic study of dynamical processes such as spin diffusion in this SU (N ) system. We also show how to use this system to generate entangled states that allow for Heisenberg-limited metrology. This highly symmetric spin model should be experimentally realizable even when the vibrational levels are occupied according to a high-temperature thermal or an arbitrary nonthermal distribution.
A strategy for service realization in service-oriented design
LIU Jing; HE Jifeng; LIU Zhiming
2006-01-01
Recently service orientation is becoming a mainstream approach for building large scale software systems. A key requirement in service-oriented design is the dependability of service. It stipulates that the behavior of services is controllable. Formal models can aid in constructing software in a dependable manner. They can describe services precisely and compose them together consistently. This paper presents a strategy for service realization based on a novel layered formal model. When a service is provided or required via internet, the semantic consistency becomes critical issue. Our architecture tackles the issue by proposing a novel scheme: defining contract of a service to keep semantic information. Although service-oriented design is our prime target, the contract models, to a large extent, are independent of the framework of design and therefore applicable to large scale software design in general.
Realization of Functional Complete Stateful Boolean Logic in Memristive Crossbar.
Li, Yi; Zhou, Ya-Xiong; Xu, Lei; Lu, Ke; Wang, Zhuo-Rui; Duan, Nian; Jiang, Lei; Cheng, Long; Chang, Ting-Chang; Chang, Kuan-Chang; Sun, Hua-Jun; Xue, Kan-Hao; Miao, Xiang-Shui
2016-12-21
Nonvolatile stateful logic computing in memristors is a promising paradigm with which to realize the unity of information storage and processing in the same physical location that has shown great feasibility for breaking the von Neumann bottleneck in traditional computing architecture. How to reduce the computational complexity of memristor-based logic functions is a matter of concern. Here, based on a general logic expression, we proposed a method to implement the arbitrary logic of complete 16 Boolean logic in two steps with one memristor in the crossbar architecture. A representative functional complete NAND logic is successfully experimentally demonstrated in the filamentary Ag-AgGeTe-Ta memristors to prove the validity of our method. We believe our work may promote the development of the revolutionary logic in memory architectures.
A version management model of PDM system and its realization
ZHONG Shi-sheng; LI Tao
2008-01-01
Based on the key function of version management in PDM system, this paper discusses the function and the realization of version management and the transitions of version states with a workflow. A directed acy-clic graph is used to describe a version model. Three storage modes of the directed acyclic graph version model in the database, the bumping block and the PDM working memory are presented and the conversion principle of these three modes is given. The study indicates that building a dynamic product structure configuration model based on versions is the key to resolve the problem. Thus a version model of single product object is built. Then the version management model in product structure configuration is built and the apphcation of version manage-ment of PDM syste' is presented as a case.
Realization Techniques of Virtual Assembly Process Planning System
LIU Jian-hua; NING Ru-xin; TANG Cheng-tong
2005-01-01
The key realization techniques of virtual assembly process planning (VAPP) system are analyzed,including virtual assembly model, real-time collision detection, automatic constraint recognition algorithm, cable harness assembly process planning and visual assembly process plan at the workshop. A virtual assembly model based on hierarchical assembly task list (HATL) is put forward, in which assembly tasks are defined to express component assembling operations and are sequentially and hierarchically organized according to different subassemblies, which can perfectly model the construction process of product. And a multi-layer automatic geometry constraint recognition algorithm of how to identify assembly constraint relations in the virtual environment is proposed, then a four-layer collision detection algorithm is discussed. A VAPP system is built and some simple mechanical assemblies are used to illustrate the feasibility of the proposed method and algorithms.
Bosonic models with Fermi-liquid kinematics: realizations and properties
Goldbart, Paul; Gopalakrishnan, Sarang; Lamacraft, Austen
2011-03-01
We consider models of interacting bosons in which the single-particle kinetic energy achieves its minimum on a surface in momentum space. The kinematics of such models resembles that resulting from Pauli blocking in Fermi liquids; therefore, Shankar's renormalization-group treatment of Fermi liquids can be adapted to investigate phase transitions in these bosonic systems. We explore possible experimental realizations of such models in cold atomic gases: e.g., via spin-orbit coupling, multimode-cavity-mediated interactions, and Cooper pairing of Fermi gases in spin-dependent lattices. We address the phase structure and critical behavior of the resulting models within the framework of Ref., focusing in particular on Bose-Einstein condensation and on quantum versions of the Brazovskii transition from a superfluid to a supersolid.
Simple realization of inflaton potential on a Riemann surface
Keisuke Harigaya
2014-11-01
Full Text Available The observation of the B-mode in the cosmic microwave background radiation combined with the so-called Lyth bound suggests the trans-Planckian variation of the inflaton field during inflation. Such a large variation generates concerns over inflation models in terms of the effective field theory below the Planck scale. If the inflaton resides in a Riemann surface and the inflaton potential is a multivalued function of the inflaton field when it is viewed as a function on a complex plane, the Lyth bound can be satisfied while keeping field values in the effective field theory within the Planck scale. We show that a multivalued inflaton potential can be realized starting from a single-valued Lagrangian of the effective field theory below the Planck scale.
Realizing dignity as a part of intercultural competence
Breunig, Steven
2014-01-01
The aim of this paper is to present the concept of dignity as a refl ective concept that may serve as a strategy for enhancing intercultural competence. Within the fi eld of intercultural communication, intercultural competence seeks to impart essential knowledge and skills for engaging...... in intercultural encounters with cognitive, behavioral and affective competence. Dignity contributes to intercultural competence by enabling persons to view the social world anew. In this paper, dignity is conceptualized as the development and self-expression of persons free from social categorization, while...... for effective and appropriate interaction between a Self and a culturally dissimilar Other. Accordingly, it is proposed that emotional regulation is essential for realizing dignity as an aspect of intercultural competence. Research on social dynamics and identity and the emotions is not without its precedence...
Graphic Sequences with a Realization Containing Intersecting Cliques
Jian Hua YIN; Yan Fang DENG
2012-01-01
Let r ≥ 1,k ≥ 2 and Fmi…, mk;r denote the most general definition of a friendship graph,that is,the graph of Kr+m1,...,Kr+mk meeting in a common r set,where Kr+mi is the complete graph on r + mi vertices.Clearly,｜Fm1,...,mk;r｜ =m1 +.·· + mk + r.Let σ(F m1...,mk;r,n) be the smallest even integer such that every n-term graphic sequence π =(d1,d2,...,dn) with term sum σ(π) =d1 + d2 +...+ dn ≥ σ(F,m1...,mk;r,n) has a realization G containing Fm1,..., mk;r as a subgraph.In this paper,we determine σ(Fm1,...,mk;r,n) for n sufficiently large.
Electronic Services, the Only Way to Realize the Global Village
Amid Khatibi Bardsiri
2013-01-01
Full Text Available E-Services (Abbreviated for Electronic Services contained pointed different issues to each scientist and experts, since the operations from starting to tail of the E-Service value chain are significantly distinct compared to those for offline services and also because the digital world provides raised elasticity throughout the value chain. E-Service capability provides a chance, along with the require, to consider the customer first in the develop procedure. That is the time to expand the explanation of the word ‘Global Village’ according to the concept ‘E-Service’. Hence, the meaning of the word E-Service should be modifying regarding to the upcoming systems and styles similar to Grid, Cloud and Globalization. This paper discusses that Global Village could be realized only through the E-Services. However, today's E-Services are not suitable for this purpose, and in other words, they are not mature.
Realizing type-II Weyl points in an optical lattice
Shastri, Kunal; Yang, Zhaoju; Zhang, Baile
2017-01-01
The recent discovery of the Lorentz symmetry-violating "type-II" Weyl semimetal phase has renewed interest in the study of Weyl physics in condensed-matter systems. However, tuning the exceptional properties of this novel state has remained a challenge. Optical lattices, created using standing laser beams, provide a convenient platform to tune tunneling parameters continuously in time. In this paper, we propose a generalized two level system exhibiting type-II Weyl points that can be realized using ultracold atoms in an optical lattice. The system is engineered using a three-dimensional lattice with complex π phase tunneling amplitudes. Various unique properties of the type-II Weyl semimetal such as open Fermi surface, anomalous chirality, and topological Fermi arcs can be probed using the proposed optical lattice scheme.
Nonlinear Realization of Chiral Symmetry on the Lattice
Chandrasekharan, S; Steffen, F D; Wiese, U J
2003-01-01
We formulate lattice theories in which chiral symmetry is realized nonlinearly on the fermion fields. In this framework the fermion mass term does not break chiral symmetry. This property allows us to use the Wilson term to remove the doubler fermions while maintaining exact chiral symmetry on the lattice. Our lattice formulation enables us to address non-perturbative questions in effective field theories of baryons interacting with pions and in models involving constituent quarks interacting with pions and gluons. We show that a system containing a non-zero density of static baryons interacting with pions can be studied on the lattice without encountering complex action problems. In our formulation one can also decide non-perturbatively if the chiral quark model of Georgi and Manohar provides an appropriate low-energy description of QCD. If so, one could understand why the non-relativistic quark model works.
Self-realization and cultural narratives about later life.
Laceulle, Hanne; Baars, Jan
2014-12-01
In late modern circumstances, aging individuals are confronted with the task of creating a meaningful individual life trajectory. However, these personal narratives are situated in the context of broader cultural narratives. It is argued that current cultural narratives about aging are often stereotyping and demeaning, being based on either a decline ideology or an age-defying ideology. This complicates the ascription of meaning to later life. We argue that narrative gerontology could profit from integrating a more cultural critical stance in its investigations. Dominant cultural narratives need to be challenged by viable counter narratives aimed at repairing and strengthening the moral agency of aging individuals. We discuss the criteria such counter narratives have to answer to and consider how the moral discourse on self-realization can provide an ideological foundation for meaning-generating cultural counter narratives on aging.
Experimentally realizable control fields in quantum Lyapunov control
Yi, X X; Wu, Chunfeng; Feng, X L; Oh, C H
2011-01-01
As a hybrid of techniques from open-loop and feedback control, Lyapunov control has the advantage that it is free from the measurement-induced decoherence but it includes the system's instantaneous message in the control loop. Often, the Lyapunov control is confronted with time delay in the control fields and difficulty in practical implementations of the control. In this paper, we study the effect of time-delay on the Lyapunov control, and explore the possibility of replacing the control field with a pulse train or a bang-bang signal. The efficiency of the Lyapunov control is also presented through examining the convergence time of the controlled system. These results suggest that the Lyapunov control is robust gainst time delay, easy to realize and effective for high-dimensional quantum systems.
Realization of a time-scale with an optical clock
Grebing, C; Dörscher, S; Häfner, S; Gerginov, V; Weyers, S; Lipphardt, B; Riehle, F; Sterr, U; Lisdat, C
2015-01-01
Optical clocks are not only powerful tools for prime fundamental research, but are also deemed for the re-definition of the SI base unit second as they surpass the performance of caesium atomic clocks in both accuracy and stability by more than an order of magnitude. However, an important obstacle in this transition has so far been the limited reliability of the optical clocks that made a continuous realization of a time-scale impractical. In this paper, we demonstrate how this dilemma can be resolved and that a time-scale based on an optical clock can be established that is superior to one based on even the best caesium fountain clocks. The paper also gives further proof of the international consistency of strontium lattice clocks on the $10^{-16}$ accuracy level, which is another prerequisite for a change in the definition of the second.
Perturbative Analysis of Spectral Singularities and Their Optical Realizations
Mostafazadeh, Ali
2012-01-01
We develop a perturbative method of computing spectral singularities of a Schreodinger operator defined by a general complex potential that vanishes outside a closed interval. These can be realized as zero-width resonances in optical gain media and correspond to a lasing effect that occurs at the threshold gain. Their time-reversed copies yield coherent perfect absorption of light that is also known as an antilaser. We use our general results to establish the exactness of the n-th order perturbation theory for an arbitrary complex potential consisting of n delta-functions, obtain an exact expression for the transfer matrix of these potentials, and examine spectral singularities of complex barrier potentials of arbitrary shape. In the context of optical spectral singularities, these correspond to inhomogeneous gain media.
Realizing topological Mott insulators from the RKKY interaction
Liu, Tianhan; Douçot, Benoît; Le Hur, Karyn
2016-05-01
We engineer topological insulating phases in a fermion-fermion mixture on the honeycomb lattice, without resorting to artificial gauge fields or spin-orbit couplings and considering only local interactions. Essentially, upon integrating out the fast component (characterized by a larger hopping amplitude) in a finite region of dopings, we obtain an effective interaction between the slow fermions at half-filling, which acquires a Haldane mass with opposite parity in the two valleys of the Dirac cones, thus triggering a quantum anomalous Hall effect. We carefully analyze the competition between the induced Semenoff-type mass (producing charge density wave orders in real space) versus the Haldane mass (quantum anomalous Hall phase), as a function of the chemical potential of the fast fermions. If the second species involves spin-1/2 particles, this interaction may induce a quantum spin Hall phase. Such fermion-fermion mixtures can be realized in optical lattices or in graphene heterostructures.
Design and realization of an autonomous solar system
Gaga, A.; Diouri, O.; Es-sbai, N.; Errahimi, F.
2017-03-01
The aim of this work is the design and realization of an autonomous solar system, with MPPT control, a regulator charge/discharge of batteries, an H-bridge multi-level inverter with acquisition system and supervising based on a microcontroller. The proposed approach is based on developing a software platform in the LabVIEW environment which gives the system a flexible structure for controlling, monitoring and supervising the whole system in real time while providing power maximization and best quality of energy conversion from DC to AC power. The reliability of the proposed solar system is validated by the simulation results on PowerSim and experimental results achieved with a solar panel, a Lead acid battery, solar regulator and an H-bridge cascaded topology of single-phase inverter.
An inductorless CMOS realization of Chua's circuit
Radwan, Ahmed G.; Soliman, Ahmed M.; El-Sedeek, Abdel-Latif
2003-09-01
In this paper, an inductorless CMOS realization of Chua's circuit [IEEE Trans. Circ. Syst.--I 1985;32:798] is presented. The circuit is derived from the dimensionless form of Chua's circuit and can generate Rossler or double-scroll attractors by changing a single capacitor's value. Variables are represented in the current domain to facilitate adding or subtracting variables. New G{sub m}-C representation of the Chua diode as well as the Chua circuit are presented. The circuit can operate from supply voltage as low as {+-}1.5 V. Transistor-level simulation results using PSpice in 0.5 {mu}m Mietec process are presented.
Controllability, observability, realizability, and stability of dynamic linear systems
John M. Davis
2009-03-01
Full Text Available We develop a linear systems theory that coincides with the existing theories for continuous and discrete dynamical systems, but that also extends to linear systems defined on nonuniform time scales. The approach here is based on generalized Laplace transform methods (e.g. shifts and convolution from the recent work [13]. We study controllability in terms of the controllability Gramian and various rank conditions (including Kalman's in both the time invariant and time varying settings and compare the results. We explore observability in terms of both Gramian and rank conditions and establish related realizability results. We conclude by applying this systems theory to connect exponential and BIBO stability problems in this general setting. Numerous examples are included to show the utility of these results.
Realization of Reconfigurable Virtual Environments for Virtual Testing
Wen-Yan Wu; Zheng-Xu Zhao
2005-01-01
This paper presents the design and implementation of reconfigurable virtual environments (VEs) for virtual testing. It proposes a hybrid design approach that is derived from a so-called integration and composition of the reconfiguration strategy. The designing process has thus evolved from binding virtual objects using reconfiguration rules within the context of virtual testing scenarios. Therefore reconfigurable virtual environments are established with improved flexibility and scalability, tailored to a wide range of virtual testing applications. Those virtual environments integrate virtual testing scenarios, data acquisition, databases, rule mapping and application interfaces, which yield modular testing functions and an open-ended system architecture with a set of extensible interface tools to realize data exchange within reconfigurable VEs.This enables virtual testing scenarios to be reconfigured interactively based on real time data and communication between virtual environments and real environments. A virtual testing application has been implemented using reconfigurable VEs.
Lissajous Rocking Ratchet: Realization in a Semiconductor Quantum Dot.
Platonov, Sergey; Kästner, Bernd; Schumacher, Hans W; Kohler, Sigmund; Ludwig, Stefan
2015-09-04
Breaking time-reversal symmetry (TRS) in the absence of a net bias can give rise to directed steady-state nonequilibrium transport phenomena such as ratchet effects. Here we present, theoretically and experimentally, the concept of a Lissajous rocking ratchet based on breaking TRS. Our system is a semiconductor quantum dot with periodically modulated dot-lead tunnel barriers. Broken TRS gives rise to single electron tunneling current. Its direction is fully controlled by exploring frequency and phase relations between the two barrier modulations. The concept of Lissajous ratchets can be realized in a large variety of different systems, including nanoelectrical, nanoelectromechanical, or superconducting circuits. It promises applications based on a detailed on-chip comparison of radio-frequency signals.
Generalized conformal realizations of Kac-Moody algebras
Palmkvist, Jakob
2009-01-01
We present a construction which associates an infinite sequence of Kac-Moody algebras, labeled by a positive integer n, to one single Jordan algebra. For n =1, this reduces to the well known Kantor-Koecher-Tits construction. Our generalization utilizes a new relation between different generalized Jordan triple systems, together with their known connections to Jordan and Lie algebras. Applied to the Jordan algebra of Hermitian 3×3 matrices over the division algebras R, C, H, O, the construction gives the exceptional Lie algebras f4, e6, e7, e8 for n =2. Moreover, we obtain their infinite-dimensional extensions for n ≥3. In the case of 2×2 matrices, the resulting Lie algebras are of the form so(p +n,q+n) and the concomitant nonlinear realization generalizes the conformal transformations in a spacetime of signature (p,q).
Three Realizations and Comparison of Hardware for Piezoresistive Tactile Sensors
Rafael Navas-González
2011-03-01
Full Text Available Tactile sensors are basically arrays of force sensors that are intended to emulate the skin in applications such as assistive robotics. Local electronics are usually implemented to reduce errors and interference caused by long wires. Realizations based on standard microcontrollers, Programmable Systems on Chip (PSoCs and Field Programmable Gate Arrays (FPGAs have been proposed by the authors for the case of piezoresistive tactile sensors. The solution employing FPGAs is especially relevant since their performance is closer to that of Application Specific Integrated Circuits (ASICs than that of the other devices. This paper presents an implementation of such an idea for a specific sensor. For the purpose of comparison, the circuitry based on the other devices is also made for the same sensor. This paper discusses the implementation issues, provides details regarding the design of the hardware based on the three devices and compares them.
Realizing the next generation of CPV cells using transfer printing
Lumb, Matthew P.; Schmieder, Kenneth J.; González, María; Mack, Shawn; Yakes, Michael K.; Meitl, Matthew; Burroughs, Scott; Ebert, Chris; Bennett, Mitchell F.; Forbes, David V.; Sheng, Xing; Rogers, John A.; Walters, Robert J.
2015-09-01
Transfer-printing is an important, commercial technology for manufacturing state of the art CPV modules, and has emerged recently as a key enabling technology for the realization of ultra-high-efficiency, mechanically stacked III-V solar cells with low cost. This paper presents the latest results for microscale CPV cells grown on GaAs, InP and GaSb substrates for ultra-high-efficiency, four-terminal, mechanically stacked architectures. The latest findings from a combination of modeling, growth, processing and characterization of single and multijunction solar cells are described, and the roadmap to the long-term goal of using transfer-printing to produce the first solar cell with 50% conversion efficiency is outlined.
Realization of quantitative-grade fieldable snapshot imaging spectropolarimeter.
Jones, Stephen; Iannarilli, Frank; Kebabian, Paul
2004-12-27
We discuss achievement of a long-standing technology goal: the first practical realization of a quantitative-grade, field-worthy snapshot imaging spectropolarimeter. The instrument employs Polarimetric Spectral Intensity Modulation (PSIM), a technique that enables full Stokes instantaneous "snapshot" spectropolarimetry with perfect channel registration. This is achieved with conventional single beam optics and a single focal plane array (FPA). Simultaneity and perfect registration are obtained by encoding the polarimetry onto the spectrum via a novel optical arrangement which enables sensing from moving platforms against dynamic scenes. PSIM is feasible across the electro-optical sensing range (UV-LWIR). We present measurement results from a prototype sensor that operates in the visible and near infrared regime (450-900 nm). We discuss in some detail the calibration and Stokes spectrum inversion algorithms that are presently achieving 0.5% polarimetric accuracy.
Realization of a Service Robot for Cleaning Spherical Surfaces
Guanghua Zong
2008-11-01
Full Text Available There are more and more buildings with complicated shape emerging all over the world. Their walls require constant cleaning which is difficult to realize. In this paper, based on analyzing the characteristics of the working target,a new kind of auto-climbing robot is proposed, which is used for cleaning the spherical surface of the National GrandTheatre in China. The robots' mechanism and unique aspects are presented in detail. A distributed controller based onCAN bus is designed to meet the requirements of controlling the robot. The control system is divided into 6 parts, fiveCAN bus control nodes and a remote controller, which are designed and established based mainly on the P80C592.Finally, the motion function is described in detail. The experimental results confirm the principle described above andthe robot's ability to work on the spherical surface.
Experimental Realization of Tunable Metamaterial Hyper-transmitter
Yoo, Young Joon; Yi, Changhyun; Hwang, Ji Sub; Kim, Young Ju; Park, Sang Yoon; Kim, Ki Won; Rhee, Joo Yull; Lee, YoungPak
2016-01-01
We realized the tunable metamaterial hyper-transmitter in the microwave range utilizing simple planar meta-structure. The single-layer metamaterial hyper-transmitter shows that the transmission peak occurs at 14 GHz. In case of the dual-layer one, it is possible to control the transmission peak from 5 to 10 GHz. Moreover, all the transmission peaks reveal transmission over 100%. We experimentally and theoretically investigated these phenomena through 3-dimensional simulation and measurement. The reason for being over 100% is also elucidated. The suggested hyper-transmitter can be used, for example, in enhancing the operating distance of the electromagnetic wave in Wi-Fi, military radar, wireless power transfer and self-driving car. PMID:27629804
Experimental Realization of Tunable Metamaterial Hyper-transmitter
Yoo, Young Joon; Yi, Changhyun; Hwang, Ji Sub; Kim, Young Ju; Park, Sang Yoon; Kim, Ki Won; Rhee, Joo Yull; Lee, Youngpak
2016-09-01
We realized the tunable metamaterial hyper-transmitter in the microwave range utilizing simple planar meta-structure. The single-layer metamaterial hyper-transmitter shows that the transmission peak occurs at 14 GHz. In case of the dual-layer one, it is possible to control the transmission peak from 5 to 10 GHz. Moreover, all the transmission peaks reveal transmission over 100%. We experimentally and theoretically investigated these phenomena through 3-dimensional simulation and measurement. The reason for being over 100% is also elucidated. The suggested hyper-transmitter can be used, for example, in enhancing the operating distance of the electromagnetic wave in Wi-Fi, military radar, wireless power transfer and self-driving car.
Realization of a Service Robot for Cleaning Spherical Surfaces
Houxiang Zhang
2005-03-01
Full Text Available There are more and more buildings with complicated shape emerging all over the world. Their walls require constant cleaning which is difficult to realize. In this paper, based on analyzing the characteristics of the working target, a new kind of auto-climbing robot is proposed, which is used for cleaning the spherical surface of the National GrandTheatre in China. The robots' mechanism and unique aspects are presented in detail. A distributed controller based onCAN bus is designed to meet the requirements of controlling the robot. The control system is divided into 6 parts, fiveCAN bus control nodes and a remote controller, which are designed and established based mainly on the P80C592. Finally, the motion function is described in detail. The experimental results confirm the principle described above andthe robot's ability to work on the spherical surface.
Noncommutative Spacetime Realized in $AdS_{n+1}$ Space
Naka, S; Takanashi, T; Umezawa, E
2013-01-01
In $\\kappa$-Minkowski spacetime, the coordinates are Lie algebraic elements such that time and space coordinates do not commute, whereas space coordinates commute each other. The non-commutativity is proportional to a Planck-length-scale constant $\\kappa^{-1}$, which is a universal constant other than the light velocity under the $\\kappa$-Poincare transformation. In this sense, the spacetime has a structure called as "Doubly Special Relativity". Such a noncommutative structure is known to be realized by SO(1,4) generators in 4-dimensional de Sitter space. In this paper, we try to construct a nonommutative spacetime having commutative n-dimensional Minkowski spacetime based on $AdS_{n+1}$ space with SO(2,n) symmetry. We also study an invariant wave equation corresponding to the first Casimir invariant of this symmetry as a non-local field equation expected to yield finite loop amplitudes.
The OLI Radiometric Scale Realization Round Robin Measurement Campaign
Cutlip, Hansford; Cole,Jerold; Johnson, B. Carol; Maxwell, Stephen; Markham, Brian; Ong, Lawrence; Hom, Milton; Biggar, Stuart
2011-01-01
A round robin radiometric scale realization was performed at the Ball Aerospace Radiometric Calibration Laboratory in January/February 2011 in support of the Operational Land Imager (OLI) Program. Participants included Ball Aerospace, NIST, NASA Goddard Space Flight Center, and the University of Arizona. The eight day campaign included multiple observations of three integrating sphere sources by nine radiometers. The objective of the campaign was to validate the radiance calibration uncertainty ascribed to the integrating sphere used to calibrate the OLI instrument. The instrument level calibration source uncertainty was validated by quatnifying: (1) the long term stability of the NIST calibrated radiance artifact, (2) the responsivity scale of the Ball Aerospace transfer radiometer and (3) the operational characteristics of the large integrating sphere.
Design and Realization of the Safety Production Scheduling System
Qiang Fan
2013-01-01
Full Text Available In this study, we have a research of the design and realization of the Safety Production Scheduling System. Urged by the government departments as well as safety supervising institutions, many coal enterprises are embarking on designing and constructing an information system platform for safety production and scheduling. How to establish a systematic, comprehensive, standardized and scientific management platform for the safety production and scheduling has become a hot issue in the coal industry, which is also an important move to integrate various safety management measures in order to prevent major safety accidents and keep up with the international industry status. Taking a successful, large-scale safety production and scheduling system for example, this study elaborates on its overall design and construction. When the system is completed, it will play an important role in strengthening safety production of the coal mines, preventing accidents as well as increasing the overall safety level of the coal industry.
Design and Realization of Mineral Feeding SCADA System
无
2006-01-01
The grinding process in concentration plants of the metallurgical industry is of great importantce.. A mineral feeding SCADA system in the grinding process was designed with the idea of integrating management and control functions. A detailed design and realization method of control and supervisory control levels in the system was introduced. At the control level, with an algorithm of a separate integrated PID, four mineral feeding machines are run in turn. The supervisory control level can generate process flow graphs, statistical report forms, historical trends and at the same time, it has the functions of alarm, system administration, user login, etc. After the mineral SCADA system has been started, the mineral feeding is very stable, the workstation completely supervises and controls the entire process of mineral feeding, and at the same time historical data is shown and questions can be answered conveniently. The system runs well in the MeiShan Concentration Plant of the Shanghai Bao Shan Steel Group.
Realization of Probabilistic Identification and Clone of Quantum-States
Zhang, C W; Li, C F; Guo, G C; Zhang, Chuan-Wei; Wang, Zi-Yang; Li, Chuan-Feng; Guo, Guang- Can
2000-01-01
Although the existence of unitary evolution for probabilistic identification and clone of quantum states has been demonstrated, the concrete form is undeveloped. In this paper, we first derived unitary evolution matrixes with the given probability for $n$-state identification. On the base of the work, the corresponding Hamiltonian was illustrated in detail. To some generalization, we found unitary representations and Hamiltonians of $N$ probabilistic clones given $M$ initial exact copies using the similar method. And the probabilistic identification given $M$ initial copies come out the result in the similar way. For the specialization of quantum computer, the evolution of probabilistic identification and clone in $2^n$-dimension quantum system is successfully derived and we realize it with the universal quantum logic gates.
Automatized system for realizing solar irradiation maps of lands
Biasini, A.; Fanucci, O.; Visentin, R.
In this work are explained in detail the methodological, operating and graphic proceedings for the realization of ''solar irradiation maps'' of the Italian territory. Starting from a topographic presentation of level curves, the graphic results are elaborated by means of acquisition, classification, digitalization and automatic superimposition processes of data concerning the orography of the place (classes of slope and exposition of slopes) and the following association to the areas located in this way of the corresponding classes of the relative solar irradiation. The method has been applied and tested successfully in an area of about 400 km/sup 2/ corresponding to the quadrant NE of the leaf I.G.M.I. nr. 221 scale 1:100,000 because it seems to represent almost all possible combinations between slopes and exposition. In this work is reported an example of the final result and the intermediate stage.
Using information technology for patient education: realizing surplus value?
Stoop, Arjen P; van't Riet, Annemarie; Berg, Marc
2004-08-01
Computer-based patient information systems are introduced to replace traditional forms of patient education like brochures, leaflets, videotapes and, to a certain extent, face-to-face communication. In this paper, we claim that though computer-based patient information systems potentially have many advantages compared to traditional means, the surplus value of these systems is much harder to realize than often expected. By reporting on two computer-based patient information systems, both found to be unsuccessful, we will show that building computer-based patient information systems for patient education requires a thorough analysis of the advantages and limitations of IT compared to traditional forms of patient education. When this condition is fulfilled, however, these systems have the potential to improve health status and to be a valuable supplement to (rather than a substitute for) traditional means of patient education.
A model realizing inverse seesaw and resonant leptogenesis
Aoki, Mayumi; Takahashi, Ryo
2015-01-01
We construct a model realizing the inverse seesaw mechanism. The model has two types of gauge singlet fermions in addition to right-handed neutrinos. A required Majorana mass scale (keV scale) for generating the light active neutrino mass in the conventional inverse seesaw can be naturally explained by a "seesaw" mechanism between the two singlet fermions in our model. We find that our model can decrease the magnitude of hierarchy among mass parameters by $\\mathcal{O}(10^4)$ from that in the conventional inverse seesaw model. We also show that a successful resonant leptogenesis occurs for generating the baryon asymmetry of the universe in our model. The desired mass degeneracy for the resonant leptogenesis can also be achieved by the "seesaw" between the two singlet fermions.
Onasch, Timothy B [Aerodyne Research, Inc.; Sedlacek, Arthur J [Brookhaven National Lab. (BNL), Upton, NY (United States)
2017-03-15
The scientific focus of this study was to investigate and quantify the mass loadings, chemical compositions, and optical properties of biomass burning particulate emissions generated in the laboratory from Western U.S. fuels using a similar instrument suite to the one deployed on the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility Gulfstream-1 (G-1) aircraft during the 2013 Biomass Burning Observation Project (BBOP) field study (Kleinman and Sedlacek, 2013). We deployed the single-particle soot photometer (SP2) to make measurements of biomass burning refractory black carbon (rBC) mass loadings and size distributions to correlate with non-refractory particulate matter (NR-PM; i.e., HR-AMS) and rBC (SP-AMS) measurements as a function of photo-oxidation processes in an environmental chamber. With these measurements, we will address the following scientific questions: 1. What are the emission indices (g/kg fuel) of rBC from various wildland fuels from the Pacific Northwest (i.e., relevant to BBOP analysis) as a function of combustion conditions and simulated atmospheric processing in an environmental chamber? 2. What are the optical properties (e.g., mass-specific absorption cross-section [MAC], single-scattering albedo [SSA], and absorption Angstrom exponent [AAE)] of rBC emitted from various wildland fuels and how are they impacted by atmospheric processing? 3. How does the mixing state of rBC in biomass-burning plumes relate to the optical properties? 4. How does the emitted rBC affect radiative forcing?
Magnetic particle imaging: introduction to imaging and hardware realization.
Buzug, Thorsten M; Bringout, Gael; Erbe, Marlitt; Gräfe, Ksenija; Graeser, Matthias; Grüttner, Mandy; Halkola, Aleksi; Sattel, Timo F; Tenner, Wiebke; Wojtczyk, Hanne; Haegele, Julian; Vogt, Florian M; Barkhausen, Jörg; Lüdtke-Buzug, Kerstin
2012-12-01
Magnetic Particle Imaging (MPI) is a recently invented tomographic imaging method that quantitatively measures the spatial distribution of a tracer based on magnetic nanoparticles. The new modality promises a high sensitivity and high spatial as well as temporal resolution. There is a high potential of MPI to improve interventional and image-guided surgical procedures because, today, established medical imaging modalities typically excel in only one or two of these important imaging properties. MPI makes use of the non-linear magnetization characteristics of the magnetic nanoparticles. For this purpose, two magnetic fields are created and superimposed, a static selection field and an oscillatory drive field. If superparamagnetic iron-oxide nanoparticles (SPIOs) are subjected to the oscillatory magnetic field, the particles will react with a non-linear magnetization response, which can be measured with an appropriate pick-up coil arrangement. Due to the non-linearity of the particle magnetization, the received signal consists of the fundamental excitation frequency as well as of harmonics. After separation of the fundamental signal, the nanoparticle concentration can be reconstructed quantitatively based on the harmonics. The spatial coding is realized with the static selection field that produces a field-free point, which is moved through the field of view by the drive fields. This article focuses on the frequency-based image reconstruction approach and the corresponding imaging devices while alternative concepts like x-space MPI and field-free line imaging are described as well. The status quo in hardware realization is summarized in an overview of MPI scanners.
Realization of 16-channel digital PGC demodulator for fiber laser sensor array
Wang Lin; He Jun; Li Fang; Liu Yuliang, E-mail: wlcas@semi.ac.cn [Optoelectronics System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 (China)
2011-02-01
This paper describes a 16-element DFB FL (distributed feedback fiber laser) sensor array system interrogated by NI-PXI-based (PCI extensions for Instrumentation) digital PGC (phase generated carrier) technique. The lasing wavelengths of the DFB FLs are changed by the external strains or temperatures, and hence they can be used as sensors by detecting the wavelength shifts. An unbalanced MI (Michelson interferometer) is employed in the sensor array system to amplify the wavelength shifts of DFB FL sensors to detectable phase shifts. The output phase signals of the MI are separated into different channels by a DWDM, and then detected by a low-noise photodiode array. The digital PGC algorithm is realized on a PXI platform (NI, National Instruments), which consists of three FPGA (Field Programmable Gate Array) modules and a high performance system controller. The normalization of the interference fringe is proposed and realized in this paper to reduce the influence of the light intensity fluctuations, and a trigger mechanism is introduced into the digital multi-channel PGC demodulation scheme to synchronize the date among different channels. A 16-element DFB fiber laser sensor array system has been set up in the experiment and the demodulated results have demonstrated a minimum detectable wavelength shift of 1x10{sup -6} pmA/{radical}Hz, a linearity of as high as 0.9994, and a dynamic range of 110dB-100Hz.
Naseri, Tayebeh; Moradi, Ronak
2017-01-01
Some optical properties including the linear and nonlinear susceptibility and electromagnetically induced phase grating (EIG) in graphene under Raman excitation is studied. A single-layer graphene nanostructure driven by coherent and incoherent fields is investigated theoretically. It is revealed that by adjusting the amplitude of control and incoherent fields, the linear and nonlinear absorption as well as Kerr nonlinearity of the medium can be optimized. It is realized that the enhanced Kerr nonlinearity can occur with zero linear absorption and nonlinear amplification. Furthermore, it should be noted that EIG in graphene is studied for the first time. The results indicate that the diffraction efficiency of the phase grating is dramatically enhanced by controlling the amplitude of coherent and incoherent fields, and an efficient electromagnetically induced phase grating can be obtained. A novel result shows a considerable improvement of the intensity of higher-order diffractions and switching between different orders of grating via incoherent pumping field. Therefore, this model can be used in real experiments for the development of new types of nanoelectronic devices used for the realization of all-optical switching processes.
String Theory on Thin Semiconductors: Holographic Realization of Fermi Points and Surfaces
Rey, Soo-Jong
2009-01-01
I make a novel contact between string theory and degenerate fermion dynamics in thin semiconductors. Utilizing AdS/CFT correspondence in string theory and tunability of coupling parameters in condensed matter systems, I focus on the possibilities testing string theory from tabletop experiments. I first discuss the observation that stability of Fermi surface is classifiable according to K-theory. I then elaborate two concrete realization of Fermi surfaces of zero and two dimensions. Both are realized by complex of D3-branes and D7-branes of relative codimension 6 and 4, respectively. The setup with Fermi point models gauge dynamics of multiply stacked graphenes at half-filling. I show that string theory predicts dynamical generation of mass gap and metal-insulator quantum phase transition at zero temperature. I emphasize that conformally invariant gauge theory dynamics of the setup plays a crucial role, leading to novel conformal phase transition. The setup with Fermi surface is in collaboration with Dongsu Ba...
Experimental realization of dynamo action: present status and prospects
Giesecke, Andre; Gundrum, Thomas; Gerbeth, Gunter; Nore, Caroline; Leorat, Jacques
2012-01-01
In the last decades, the experimental study of dynamo action has made great progress. However, after the dynamo experiments in Karlsruhe and Riga, the von-Karman-Sodium (VKS) dynamo is only the third facility that has been able to demonstrate fluid flow driven self-generation of magnetic fields in a laboratory experiment. Further progress in the experimental examination of dynamo action is expected from the planned precession driven dynamo experiment that will be designed in the framework of the liquid sodium facility DRESDYN (DREsden Sodium facility for DYNamo and thermohydraulic studies). In this paper, we briefly present numerical models of the VKS dynamo that demonstrate the close relation between the axisymmetric field observed in that experiment and the soft iron material used for the flow driving impellers. We further show recent results of preparatory water experiments and design studies related to the precession dynamo and delineate the scientific prospects for the final set-up.
Zeng, Jing; Chen, Ke-Qiu; Long, Mengqiu
2017-06-01
Recently, Zhong et al (2015 Nano Lett. 15 8091) found that two additional hydrogen atoms can be adsorbed to the opposite aza-bridging nitrogen atoms of the manganese phthalocyanine (MnPc) macrocycle when exposed to H2. Thus the symmetry of the MnPc molecule is changed from 4-fold to 2-fold. Motivated by this recent experiment, we theoretically investigate a MnPc-based single-molecule junction in this work and propose a simple and reliable way to realize the transition of its electronic properties. On the basis of spin-polarized density-functional theory calculations combined with the Keldysh nonequilibrium Green’s technique, we find that the gradual hydrogenation in MnPc molecules gives rise to the changes of the hardness of the electron density and spin-selective orbital decoupling, which eventually leads to the realization of the first ever metal → half-metal → semiconductor transition behavior in single-molecule junctions. Analysis of molecular projected self-consistent Hamiltonian, Mulliken population, and local density of states also reveals an important rule for realizing this transition behavior. Our research confirms that the hydrogenation of MnPc molecules can realize various molecular functionalities in unitary material background.
Experimental realization of acoustic metasurface with double-split hollow sphere
Ding, Chang-Lin; Wang, Zhen-Ru; Shen, Fang-Liang; Chen, Huai-Jun; Zhai, Shi-Long; Zhao, Xiao-Peng
2016-03-01
We experimentally present an acoustic metasurface (AMS) with sub-wavelength thickness based on the meta-molecule consisting of eight different sized double-split hollow spheres (DSHSs). By designing the discontinuous phase profile covered 2π span induced by the DSHSs, the AMS can manipulate the reflected acoustic waves in a way that could not be imitated by natural materials. Both simulations and experiments show that the AMS can realize anomalous reflection, i.e., a normal incident wave can be reflected into an oblique direction. Moreover, the reflection angle can be flexible controlled by mechanically tuning the spatial distance of the DSHSs in the AMS, which is consistent with the generalized Snell's law.
Realization of texture synthesis algorithm based on mixed programming via COM
Qin, Rizhao; Pu, Yuanyuan; Xu, Dan; Chen, Hong
2012-01-01
This paper analyzes the respective characteristics of VS2005 and MATLAB and their performances and introduces several methods of mixed programming. Then, the paper discusses the advantages and great applications of texture synthesis from sample (TSFS) and Image Quilting algorithm which is a typical algorithm of TSFS. Further, the paper realizes the Image Quilting algorithm by using mixed programming between VS2005 and MATLAB2007a via COM. We can perceive that mixed programming via COM that is used in developing texture synthesis program can not only speeds up its efficiency and reliability, but also strengthen the convenience of operation and visualization. Finally, the paper summarizes the relationship between texture synthesis parameters and synthesis effects from the experiment.
Experimental realization of the Yang-Baxter Equation via NMR interferometry.
Vind, F Anvari; Foerster, A; Oliveira, I S; Sarthour, R S; Soares-Pinto, D O; Souza, A M; Roditi, I
2016-02-10
The Yang-Baxter equation is an important tool in theoretical physics, with many applications in different domains that span from condensed matter to string theory. Recently, the interest on the equation has increased due to its connection to quantum information processing. It has been shown that the Yang-Baxter equation is closely related to quantum entanglement and quantum computation. Therefore, owing to the broad relevance of this equation, besides theoretical studies, it also became significant to pursue its experimental implementation. Here, we show an experimental realization of the Yang-Baxter equation and verify its validity through a Nuclear Magnetic Resonance (NMR) interferometric setup. Our experiment was performed on a liquid state Iodotrifluoroethylene sample which contains molecules with three qubits. We use Controlled-transfer gates that allow us to build a pseudo-pure state from which we are able to apply a quantum information protocol that implements the Yang-Baxter equation.
Realization on the interactive remote video conference system based on multi-Agent
Zheng Yan
2016-01-01
Full Text Available To make people at different places participate in the same conference, speak and discuss freely, the interactive remote video conferencing system is designed and realized based on multi-Agent collaboration. FEC (forward error correction and tree P2P technology are firstly used to build a live conference structure to transfer audio and video data; then the branch conference port can participate to speak and discuss through the application of becoming a interactive focus; the introduction of multi-Agent collaboration technology improve the system robustness. The experiments showed that, under normal network conditions, the system can support 350 branch conference node simultaneously to make live broadcasting. The audio and video quality is smooth. It can carry out large-scale remote video conference.
Experimental realization of Bloch oscillations in a parity-time synthetic silicon photonic lattice.
Xu, Ye-Long; Fegadolli, William S; Gan, Lin; Lu, Ming-Hui; Liu, Xiao-Ping; Li, Zhi-Yuan; Scherer, Axel; Chen, Yan-Feng
2016-04-20
As an important electron transportation phenomenon, Bloch oscillations have been extensively studied in condensed matter. Due to the similarity in wave properties between electrons and other quantum particles, Bloch oscillations have been observed in atom lattices, photonic lattices, and so on. One of the many distinct advantages for choosing these systems over the regular electronic systems is the versatility in engineering artificial potentials. Here by utilizing dissipative elements in a CMOS-compatible photonic platform to create a periodic complex potential and by exploiting the emerging concept of parity-time synthetic photonics, we experimentally realize spatial Bloch oscillations in a non-Hermitian photonic system on a chip level. Our demonstration may have significant impact in the field of quantum simulation by following the recent trend of moving complicated table-top quantum optics experiments onto the fully integrated CMOS-compatible silicon platform.
The material realization of science from Habermas to experimentation and referential realism
Radder, Hans
2012-01-01
This book develops a conception of science as a multi-dimensional practice, which includes experimental action and production, conceptual-theoretical interpretation, and formal-mathematical work. On this basis, it addresses the topical issue of scientific realism and expounds a detailed, referentially realist account of the natural sciences. This account is shown to be compatible with the frequent occurrence of conceptual discontinuities in the historical development of the sciences. Referential realism exploits several fruitful ideas of Jürgen Habermas, especially his distinction between objectivity and truth; it builds on a in-depth analysis of scientific experiments, including their material realization; and it is developed through an extensive case study in the history and philosophy of quantum mechanics. The new postscript explains how the book relates to several important issues in recent philosophy of science and science studies.
Realizing Tunable Inverse and Normal Doppler Shifts in Reconfigurable RF Metamaterials
Ran, Jia; Zhang, Yewen; Chen, Xiaodong; Fang, Kai; Zhao, Junfei; Sun, Yong; Chen, Hong
2015-06-01
The Doppler effect has well-established applications in astronomy, medicine, radar and metrology. Recently, a number of experimental demonstrations of the inverse Doppler effect have begun to appear. However, the inverse Doppler effect has never been observed on an electronically reconfigurable system with an external electromagnetic wave source at radio frequencies (RF) in experiment. Here we demonstrate an experimental observation of the inverse Doppler shift on an electronically reconfigurable RF metamaterial structure, which can exhibit anomalous dispersion, normal dispersion or a stop band, depending on an applied bias voltage. Either inverse or normal Doppler shift is realized by injecting an external RF signal into the electronically reconfigurable metamaterial, on which an electronically controllable moving reflective boundary is formed. The effective velocity of this boundary and the resulting frequency shift can be tuned over a wide range by a digital switching circuit. This work is expected to open up possibilities in applying the inverse Doppler effect in wireless communications, radar and satellite navigation.
Ghosh, A
1988-08-01
Lanczos and conjugate gradient algorithms are important in computational linear algebra. In this paper, a parallel pipelined realization of these algorithms on a ring of optical linear algebra processors is described. The flow of data is designed to minimize the idle times of the optical multiprocessor and the redundancy of computations. The effects of optical round-off errors on the solutions obtained by the optical Lanczos and conjugate gradient algorithms are analyzed, and it is shown that optical preconditioning can improve the accuracy of these algorithms substantially. Algorithms for optical preconditioning and results of numerical experiments on solving linear systems of equations arising from partial differential equations are discussed. Since the Lanczos algorithm is used mostly with sparse matrices, a folded storage scheme to represent sparse matrices on spatial light modulators is also described.
Realization of an all-dielectric zero-index optical metamaterial
Moitra, Parikshit; Anderson, Zachary; Kravchenko, Ivan I; Briggs, Dayrl P; Valentine, Jason
2013-01-01
Metamaterials offer unprecedented flexibility for manipulating the optical properties of matter, including the ability to access negative index, ultra-high index and chiral optical properties. Recently, metamaterials with near-zero refractive index have drawn much attention. Light inside such materials experiences no spatial phase change and extremely large phase velocity, properties that can be applied for realizing directional emission, tunneling waveguides, large area single mode devices, and electromagnetic cloaks. However, at optical frequencies previously demonstrated zero- or negative-refractive index metamaterials require the use of metallic inclusions, leading to large ohmic loss, a serious impediment to device applications. Here, we experimentally demonstrate an impedance matched zero-index metamaterial at optical frequencies based on purely dielectric constituents. Formed from stacked silicon rod unit cells, the metamaterial possesses a nearly isotropic low-index response leading to angular selecti...
Realization of OFDM modulation and demodulation for visible light communication based on FPGA
Wu, Chun-hui; Gao, Zong-yu; Li, Hong-lei; Chen, Xiong-bin; Mao, Xu-rui; Lu, Hui-min; Wang, Jian-ping; He, Lin; Cui, Shi-gang; Chen, Hong-da
2017-01-01
In order to ensure stable, correct and real-time high-speed transmission of indoor visible light communication (VLC), the key modulation and demodulation technologies of orthogonal frequency division multiplexing (OFDM) are studied in this paper. The time-domain synchronization, frequency synchronization and channel equalization of receiver are analyzed and optimized by utilizing short and long training preamble. Moreover, field programmable gate array (FPGA) development board (Xilinx Kintex-7) and Verilog hardware description language are used to realize the design of proposed OFDM-VLC system. Simulation and experiment both verify the feasibility of the hardware designs of this system. The proposed OFDM-based VLC system can process signal in real-time, which can be used in actual VLC application systems.
Hirose, Noriaki; Iwasaki, Makoto; Kawafuku, Motohiro; Hirai, Hiromu
In this paper, we present a novel type of feedback compensation for achieving robust vibration suppression of resonant modes in mechatronic systems by the use of allpass filters. In most mechactronic systems, residual vibration must be sufficiently suppressed during precise positioning. In order to achieve the required vibration suppression, the proposed feedback compensation realized using allpass filters is adopted to stabilize the resonant modes without attenuating the gain and to improve the sensitivity characteristics around the resonant modes even when the plant system has high-order vibration modes and time-delay characteristics. The effectiveness of the proposed approach has been verified by carrying out numerical simulations and performing experiments using a prototype.
Experimental realization of Bloch oscillations in a parity-time synthetic silicon photonic lattice
Xu, Ye-Long; Fegadolli, William S.; Gan, Lin; Lu, Ming-Hui; Liu, Xiao-Ping; Li, Zhi-Yuan; Scherer, Axel; Chen, Yan-Feng
2016-04-01
As an important electron transportation phenomenon, Bloch oscillations have been extensively studied in condensed matter. Due to the similarity in wave properties between electrons and other quantum particles, Bloch oscillations have been observed in atom lattices, photonic lattices, and so on. One of the many distinct advantages for choosing these systems over the regular electronic systems is the versatility in engineering artificial potentials. Here by utilizing dissipative elements in a CMOS-compatible photonic platform to create a periodic complex potential and by exploiting the emerging concept of parity-time synthetic photonics, we experimentally realize spatial Bloch oscillations in a non-Hermitian photonic system on a chip level. Our demonstration may have significant impact in the field of quantum simulation by following the recent trend of moving complicated table-top quantum optics experiments onto the fully integrated CMOS-compatible silicon platform.
An urban Encounter: Realizing online connectedness through local urban play
Shklovski, Irina; de Souza e Silva, Adriana Araujo
2013-01-01
, while gained in-game, could be leveraged for civic engagement, belonging and mutual support. While the local, physical experience of the everyday and the game was important, the connections to the distributed community resulted in expanded horizons and changed the nature of the local experience......-based communication in daily experience. The most important outcome of these games then was not the direct individual engagement with the urban environment through technology or the collaboration with strangers in the course of play (although these were the necessary prerequisites), but the social relationships that...
Free Field Realization of Quantum Superalgebra $U_q(\\hat{{sl}}(N|1))$
Kojima, Takeo
2011-01-01
We construct a free field realization of the quantum superalgebra $U_q(\\hat{sl}(N|1))$ for an arbitrary level $k$, that we call $q$-Wakimoto realization. Using the dressing deformation, we construct a free field realization of the the elliptic deformed superalgebra $U_{q,p}(\\hat{sl}(N|1))$ for an arbitrary level $k$.
Does Realized Skewness Predict the Cross-Section of Equity Returns?
Amaya, Diego; Christoffersen, Peter; Jacobs, Kris
2015-01-01
We use intraday data to compute weekly realized moments for equity returns and study their time-series and cross-sectional properties. Buying stocks in the lowest realized skewness decile and selling stocks in the highest realized skewness decile generates an average return of 19 basis points the...
Realizing the classical XY Hamiltonian in polariton simulators.
Berloff, Natalia G; Silva, Matteo; Kalinin, Kirill; Askitopoulos, Alexis; Töpfer, Julian D; Cilibrizzi, Pasquale; Langbein, Wolfgang; Lagoudakis, Pavlos G
2017-09-25
The vast majority of real-life optimization problems with a large number of degrees of freedom are intractable by classical computers, since their complexity grows exponentially fast with the number of variables. Many of these problems can be mapped into classical spin models, such as the Ising, the XY or the Heisenberg models, so that optimization problems are reduced to finding the global minimum of spin models. Here, we propose and investigate the potential of polariton graphs as an efficient analogue simulator for finding the global minimum of the XY model. By imprinting polariton condensate lattices of bespoke geometries we show that we can engineer various coupling strengths between the lattice sites and read out the result of the global minimization through the relative phases. Besides solving optimization problems, polariton graphs can simulate a large variety of systems undergoing the U(1) symmetry-breaking transition. We realize various magnetic phases, such as ferromagnetic, anti-ferromagnetic, and frustrated spin configurations on a linear chain, the unit cells of square and triangular lattices, a disordered graph, and demonstrate the potential for size scalability on an extended square lattice of 45 coherently coupled polariton condensates. Our results provide a route to study unconventional superfluids, spin liquids, Berezinskii-Kosterlitz-Thouless phase transition, and classical magnetism, among the many systems that are described by the XY Hamiltonian.
AstroSat: From Inception to Realization and Launch
P. C. Agrawal
2017-06-01
The origin of the idea of AstroSat multi wavelength satellite mission and how it evolved over the next 15 years from a concept to the successful development of instruments for giving concrete shape to this mission, is recounted in this article. AstroSat is the outcome of intense deliberations in the Indian astronomy community leading to a consensus for a multi wavelength Observatory having broad spectral coverage over five decades in energy covering near-UV, far-UV, soft X-ray and hard X-ray bands. The multi wavelength observation capability of AstroSat with a suite of 4 co-aligned instruments and an X-ray sky monitor on a single satellite platform, imparts a unique character to this mission. AstroSat owes its realization to the collaborative efforts of the various ISRO centres, several Indian institutions, and a few institutions abroad which developed the 5 instruments and various sub systems of the satellite. AstroSat was launched on September 28, 2015 from India in a near equatorial 650 km circular orbit. The instruments are by and large working as planned and in the past 14 months more than 200 X-ray and UV sources have been studied with it. The important characteristics of AstroSat satellite and scientific instruments will be highlighted.
Final Report for the Virtual Reliability Realization System LDRD
DELLIN, THEODORE A.; HENDERSON, CHRISTOPHER L.; O' TOOLE, EDWARD J.
2000-12-01
Current approaches to reliability are not adequate to keep pace with the need for faster, better and cheaper products and systems. This is especially true in high consequence of failure applications. The original proposal for the LDRD was to look at this challenge and see if there was a new paradigm that could make reliability predictions, along with a quantitative estimate of the risk in that prediction, in a way that was faster, better and cheaper. Such an approach would be based on the underlying science models that are the backbone of reliability predictions. The new paradigm would be implemented in two software tools: the Virtual Reliability Realization System (VRRS) and the Reliability Expert System (REX). The three-year LDRD was funded at a reduced level for the first year ($120K vs. $250K) and not renewed. Because of the reduced funding, we concentrated on the initial development of the expertise system. We developed an interactive semiconductor calculation tool needed for reliability analyses. We also were able to generate a basic functional system using Microsoft Siteserver Commerce Edition and Microsoft Sequel Server. The base system has the capability to store Office documents from multiple authors, and has the ability to track and charge for usage. The full outline of the knowledge model has been incorporated as well as examples of various types of content.
Experimental Realization of the Harper-Hofstadter Model
Kennedy, Colin
Extensions of Berry's phase and the quantum Hall effect have led to the discovery of new states of matter with topological properties. Traditionally, this has been achieved using magnetic fields or spin-orbit interactions, which couple only to charged particles. For neutral ultracold atoms, synthetic magnetic fields have been created that are strong enough to realize the Harper-Hofstadter model. In this talk, I report on work studying Bose-Einstein condensation in the Harper-Hofstadter Hamiltonian with one-half flux quantum per lattice unit cell. The diffraction pattern of the superfluid state directly shows the momentum distribution of the wavefunction, which is gauge-dependent, and it reveals both the reduced symmetry of the vector potential and the degeneracy of the ground state. I present an adiabatic, many-body state preparation protocol via the Mott insulating phase and show the superfluid ground state in a three-dimensional lattice with moderate interactions. I will discuss progress towards a triple-superlattice implementation as well as prospects for exploring exotic states close to the Mott transition.
Experimental realization of optical lumped nanocircuits at infrared wavelengths.
Sun, Yong; Edwards, Brian; Alù, Andrea; Engheta, Nader
2012-01-29
The integration of radiofrequency electronic methodologies on micro- as well as nanoscale platforms is crucial for information processing and data-storage technologies. In electronics, radiofrequency signals are controlled and manipulated by 'lumped' circuit elements, such as resistors, inductors and capacitors. In earlier work, we theoretically proposed that optical nanostructures, when properly designed and judiciously arranged, could behave as nanoscale lumped circuit elements--but at optical frequencies. Here, for the first time we experimentally demonstrate a two-dimensional optical nanocircuit at mid-infrared wavelengths. With the guidance of circuit theory, we design and fabricate arrays of Si3N4 nanorods with specific deep subwavelength cross-sections, quantitatively evaluate their equivalent impedance as lumped circuit elements in the mid-infrared regime, and by Fourier transform infrared spectroscopy show that these nanostructures can indeed function as two-dimensional optical lumped circuit elements. We further show that the connections among nanocircuit elements, in particular whether they are in series or in parallel combination, can be controlled by the polarization of impinging optical signals, realizing the notion of 'stereo-circuitry' in metatronics-metamaterials-inspired optical circuitry.
A tunable electronic beam splitter realized with crossed graphene nanoribbons
Brandimarte, Pedro; Engelund, Mads; Papior, Nick; Garcia-Lekue, Aran; Frederiksen, Thomas; Sánchez-Portal, Daniel
2017-03-01
Graphene nanoribbons (GNRs) are promising components in future nanoelectronics due to the large mobility of graphene electrons and their tunable electronic band gap in combination with recent experimental developments of on-surface chemistry strategies for their growth. Here, we explore a prototype 4-terminal semiconducting device formed by two crossed armchair GNRs (AGNRs) using state-of-the-art first-principles transport methods. We analyze in detail the roles of intersection angle, stacking order, inter-GNR separation, GNR width, and finite voltages on the transport characteristics. Interestingly, when the AGNRs intersect at θ =60° , electrons injected from one terminal can be split into two outgoing waves with a tunable ratio around 50% and with almost negligible back-reflection. The split electron wave is found to propagate partly straight across the intersection region in one ribbon and partly in one direction of the other ribbon, i.e., in analogy with an optical beam splitter. Our simulations further identify realistic conditions for which this semiconducting device can act as a mechanically controllable electronic beam splitter with possible applications in carbon-based quantum electronic circuits and electron optics. We rationalize our findings with a simple model suggesting that electronic beam splitters can generally be realized with crossed GNRs.
Two-dimensional gallium nitride realized via graphene encapsulation
Al Balushi, Zakaria Y.; Wang, Ke; Ghosh, Ram Krishna; Vilá, Rafael A.; Eichfeld, Sarah M.; Caldwell, Joshua D.; Qin, Xiaoye; Lin, Yu-Chuan; Desario, Paul A.; Stone, Greg; Subramanian, Shruti; Paul, Dennis F.; Wallace, Robert M.; Datta, Suman; Redwing, Joan M.; Robinson, Joshua A.
2016-11-01
The spectrum of two-dimensional (2D) and layered materials `beyond graphene’ offers a remarkable platform to study new phenomena in condensed matter physics. Among these materials, layered hexagonal boron nitride (hBN), with its wide bandgap energy (~5.0-6.0 eV), has clearly established that 2D nitrides are key to advancing 2D devices. A gap, however, remains between the theoretical prediction of 2D nitrides `beyond hBN’ and experimental realization of such structures. Here we demonstrate the synthesis of 2D gallium nitride (GaN) via a migration-enhanced encapsulated growth (MEEG) technique utilizing epitaxial graphene. We theoretically predict and experimentally validate that the atomic structure of 2D GaN grown via MEEG is notably different from reported theory. Moreover, we establish that graphene plays a critical role in stabilizing the direct-bandgap (nearly 5.0 eV), 2D buckled structure. Our results provide a foundation for discovery and stabilization of 2D nitrides that are difficult to prepare via traditional synthesis.
Optimization of Dynamic Range of Cascade Filter Realization
J. Hospodka
2006-09-01
Full Text Available This paper deals with a dynamic range optimization procedure for active filters based on the cascade realization. Dynamic characteristics of the cascade filter depend on many factors, mainly on pole-zero pairing, section ordering and gain assignment. Just the procedure for an optimal gain assignment for particular biquadratic sections is discussed in this paper. The input parameters of the procedure are parameters of particular biquads i.e. pole frequency ÃÂ‰0, quality factor Q, eventually zero frequency ÃÂ‰n for elliptic section and the transfer function type of the section. The gain is distributed so that output signal limitation of particular biquads occurs for the same level of the filter input signal. The procedure is versatile - can be used for analog as well as for digital filters with the cascade structure. The presented algorithm is fully universal (does not suppose any simplification. It has been used in Syntfil package for the filter design in the mathematical program Maple.
Perpendicular magnetic recording-Its development and realization
Iwasaki, Shun-ichi, E-mail: iwasaki@tohtech.ac.jp [Tohoku Institute of Technology, 35-1 Yagiyamakasumi-cho, Taihaku-ku, Sendai 982-8577 (Japan)
2012-02-15
Development of perpendicular magnetic recording is summarized along with learning from the research study. The early stage of perpendicular recording was conducted with the research philosophy of complementarity between perpendicular and horizontal recordings. Although present production of the perpendicular recording HDDs exceeds 600 million per year, development of perpendicular recording experienced the valley of death in the 1990s. The difficult period was overcome by the collaboration system of industrial and academic communities. The research on perpendicular recording brought about development of new research model as well as the historical view of the development of technology and innovation. The huge influence of perpendicular recording on society also taught us the relationship between science and technology with culture and civilization. - Research Highlights: > Discovery of circular magnetization led to idea of perpendicular recording. > SPT head and Co-Cr media were realized for practical perpendicular recording. > The complementarity between perpendicular and in-plane recording helped progress. > Death valley of research has been overcome by cooperation with potent companies. > Present mass production of HDDs is making a new civilization of the society.
Hofstadter butterflies in nonlinear Harper lattices, and their optical realizations
Manela, Ofer; Segev, Mordechai [Department of Physics and Solid State Institute, Technion, Haifa 32000 (Israel); Christodoulides, Demetrios N [College of Optics/CREOL, University of Central Florida, FL 32816-2700 (United States); Kip, Detlef, E-mail: msegev@tx.technion.ac.i [Department of Electrical Engineering, Helmut Schmidt University, 22043 Hamburg (Germany)
2010-05-15
The ubiquitous Hofstadter butterfly describes a variety of systems characterized by incommensurable periodicities, ranging from Bloch electrons in magnetic fields and the quantum Hall effect to cold atoms in optical lattices and more. Here, we introduce nonlinearity into the underlying (Harper) model and study the nonlinear spectra and the corresponding extended eigenmodes of nonlinear quasiperiodic systems. We show that the spectra of the nonlinear eigenmodes form deformed versions of the Hofstadter butterfly and demonstrate that the modes can be classified into two families: nonlinear modes that are a 'continuation' of the linear modes of the system and new nonlinear modes that have no counterparts in the linear spectrum. Finally, we propose an optical realization of the linear and nonlinear Harper models in transversely modulated waveguide arrays, where these Hofstadter butterflies can be observed. This work is relevant to a variety of other branches of physics beyond optics, such as disorder-induced localization in ultracold bosonic gases, localization transition processes in disordered lattices, and more.
Realization of 3-D DWT-SPIHT video compression algorithm
Xu, Sheng; Hu, Bo; Gao, Jia
2005-07-01
Recently, an application of the state-of-the-art SPIHT (Set Partitioning In Hierarchical Trees) algorithm to video sequences 3-D DWT-SPIHT, by using 3-D wavelet and 3-D spatio-temporal dependent trees has proved its efficiency and its real-time capability in the lossy compression of video. However, the basic SPIHT algorithm uses dynamic data structures and requires a very large memory that makes a hardware realization difficult. In this paper, we present an absolutely new approach to partition the wavelet image coefficients into 3D radial tree groups which can be independently processed with an embedded coder. As a result, the memory requirement is drastically reduced. Using the proposed memory-efficient algorithm, we have successfully achieved a real-time implementation of 3-D DWT-SPIHT video compression algorithm using DSP chip. And our experimental results show that the algorithm meets common requirement of real-time video coding and is proven to be a practical and efficient hardware solution.
IDENTIFICATION OF ASPECTS USING COLOURED PETRINETS AND ASPECT REALIZATION
S.SOWMYADEVI
2013-04-01
Full Text Available a major impediment to program comprehension, maintenance and resolvability is the existence of crosscutting concerns scattered across different modules tangled with implementations of other concerns. Presence of crosscutting concerns in software systems can lead to bloated and inefficient software systems that are difficult to evolve, hard to analyse, difficult to reuse and costly to maintain. Aspect-oriented programming is a complementary programming technique to the object-oriented programming. It provides tools for managing so called cross-cutting concerns. The concept of aspect orientation with presentation of a method could modulate crosscutting concerns into the single manageable unit called, aspect. This method will solve many problems such as tangling and scattering of code. But the identification and specification of crosscutting concerns and considering it as aspects is not an easy job. The proposed method defines requirements and concerns in the formal form by Petri Nets and named them as requirement nets and concern nets. Concern nets with dependencies which there are between requirement nets, model the final system. The execution of final modelled software system based on Petri Nets and monitoring its transitions, shows crosscutting concerns which are candidate aspects. In this paper, we propose a formal method based on Petri Nets, for the identification of aspect and finding out the most dominant aspect. Then the aspect realization is done by using programming language with some case study.
Realization of an endoscope equipped with microprojection system for optogenetics
Baumgartner, Ryan; Falk, Ryan; Pashaie, Ramin
2012-03-01
Optogenetics is the science where recent progresses in the field of photonics are combined with the techniques in molecular genetics to develop a methodology for modulation of neural activities.1-9 Despite enormous enthusiasm in using optogenetics for brain studies, little has been done on the engineering side such as technology development for light delivery or realization of reliable systems for optical monitoring of the induced activities. In this project, we have implemented a Digital Micromirror Device based microprojection system capable of delivering illumination patterns through a high-resolution imaging fiber bundle that guides the pattern to the region of interest on the surface or within the brain tissue. The system is also equipped with an imaging path for detection of calcium signals and monitoring the induced patterns of cellular activities. A very interesting application of the system is extracting topographic computational maps of cortex or cellular receptive fields in-vivo. It is known that such maps are the engine of information processing in the cortex. Better understanding of the structure of such maps will help to unravel the mysteries of brain higher level computations. Another application of this system is related to the high-resolution stimulation patterns that cannot be produced with electrode arrays. Production of high-resolution patterns is important in the study of specific modes of brain activities. We report the details of our optical design, preliminary results produced by testing the system on tissue, and we discuss our strategy to extract new data from the brain tissue.
Realization of a Complex Control & Diagnosis System on Simplified Hardware
Stetter, R.; Swamy Prasad, M.
2015-11-01
Energy is an important factor in today's industrial environment. Pump systems account for about 20% of the total industrial electrical energy consumption. Several studies show that with proper monitoring, control and maintenance, the efficiency of pump systems can be increased. Controlling pump systems with intelligent systems can help to reduce a pump's energy consumption by up to one third of its original consumption. The research in this paper was carried out in the scope of a research project which involves modelling and simulation of pump systems. This paper focuses on the future implementation of modelling capabilities in PLCs (programmable logic controllers). The whole project aims to use a pump itself as the sensor rather than introducing external sensors into the system, which would increase the cost considerably. One promising approach for an economic and robust industrial implementation of this intelligence is the use of PLCs. PLCs can be simulated in multiple ways; in this project, Codesys was chosen for several reasons which are explained in this paper. The first part of this paper explains the modelling of a pump itself, the process load of the asynchronous motor with a control system, and the simulation possibilities of the motor in Codesys. The second part describes the simulation and testing of a system realized. The third part elaborates the Codesys system structure and interfacing of the system with external files. The final part consists of comparing the result with an earlier Matlab/SIMULINK model and original test data.
Special Aspects of the Media Category Realization in Chinese Microblogs
Li Feixiang
2016-12-01
Full Text Available The article is devoted to the research of the phenomenon of microblogging, which is an essential part of Chinese culture media. Microblog is considered as an innovative genre of Internet-journalism and as a kind of media text, since in many cases it is also the fact of mass communication and multimedia products, which involves different ways of transmitting information: verbal, visual and audiovisual. Specific examples demonstrate specificity of realization of media categories in the texts of the Chinese microblogging, it is analyzed the characteristics of the combination of diverse components of the text: the actual verbal, visual static and dynamic visual. The classification of the nature of microblogging used in multimedia is given. It is differentiated the following types of microblogging: monocomponent polycoded microblogging, two-component polycoded microblogging with static iconic element, two-component polycoded microblogging with dynamic visual component, multi-component monocoded and polycoded microblogging, including a hyperlink. The role of hyperlinks and the actual verbal component in microblogging is considered. Hyperlink promotes expansion of the boundaries of the text and implies to overcome technical limitations, reduce the amount of information transmitted. Actually verbal text conveys the author’s emotions, but also acts as a metatext in relation to the static or dynamic images.
Awata, H; Shiraishi, J
1997-01-01
We present a q-difference realization of the quantum superalgebra U_q(sl(M|N)), which includes Grassmann even and odd coordinates and their derivatives. Based on this result we obtain a free boson realization of the quantum affine superalgebra U_q(\\widehat{sl}(2|1)) of an arbitrary level k.
黄晓梅; 沈祥兴
2001-01-01
Based on the authors' experiences in practice, this paper deals with the technology and scheme of designing and realizing the experimental Internet-Based Information Retrieval Network System. It mainly discusses its general design scheme and access to the Internet.
Modeling and optoelectronic realization of an artificial cortex
Pashaie, Ramin
Cortex, the outermost layer of the cerebrum, is recognized as the most developed part of the brain. It is believed that the higher-level functionality of the brain, the operations such as perception, cognition, and learning of both static and dynamic sensory information, originates from the dynamics of the massively interconnected gray cells of cortex. Because of the compact three-dimensional architecture of this biological computational paradigm, realization of bio-inspired machines that imitate such functionalities, including all the cellular details, is prohibitively difficult even if we consider the available nano-fabrication technologies. Based on this logical deduction, instead of considering each single neuron, an intriguing conjecture is to build aggregate level models that mimic the behavior of a population of neurons with collective emergent properties. In our approach, which is presented in this dissertation, cortex is assumed to be a composition of a sequence of discernable interconnected cortical patches. Each concerned patch is a network of asymmetrically coupled complex processing elements whose dynamics contain not only fixed-point and periodic attractors but also bifurcation and chaos. Dynamics of the complex processing elements, in this dissertation, is mathematically modeled by a slight modification of the time evolution of netlets adapted from computational neuroscience. Regarding this modification, the dynamics of a netlet is approximated by that of a quadratic return map. Studying the previous experimental observations demonstrates that a smart way of coupling such processing units is to couple them through their bifurcation parameters. Putting all pieces of this puzzle together, we model each cortical patch by a network of parametrically coupled quadratic return maps. Our simulations prove the ability of this network to emulate many salient features of cortical information processing, such as clustering, classification, generation of sparse
Cui, Junning; He, Zhangqiang; Tan, Jiubin; Sun, Tao
2016-10-03
The deviation of wave plates' optical axes from their intended angles, which may result from either instability or assembly error, is the main cause of quadrature phase error in homodyne quadrature laser interferometers (HQLIs). The quadrature phase error sensitivity to wave plate angle deviations, which is an effective measure of HQLI robustness, is further amplified by beam splitter imperfections. In this paper, a new HQLI design involving non-polarization beam splitting is presented, and a method of making this HQLI robust by yawing the wave plates in the measurement and reference arms is proposed. The theoretical analysis results indicate that ultra-low quadrature phase error sensitivities to wave plate angle deviations can be realized and that non-polarizing beam splitter imperfections can be adequately compensated for. The experimental results demonstrate that the proposed method can reduce the quadrature phase error sensitivity by more than 1 order of magnitude, from a theoretical value of 1.4°/1° to 0.05°/1°.
Tone-3 Accent Realization in Short Chinese Sentences
CAO Wen; ZHANG Jinsong
2008-01-01
To investigate how a low tone (tone-3,T3) syllable in Chinese can be perceived to be focal ac-canted or not,a total of 156 sentences containing tone-3 words were synthesized and used as stimuli in a perceptual study.The sentences differed in the falling value between the two high pitches,and in the dura-tion and phonation types of the T3 syllables.Thirty-nine subjects were asked to judge where the focus or accent was for each sentence.The results show that at least three degrees of pitch drop are involved in the focus recognition: a big sized drop of about 10 semitones; a middle sized drop of about 6 semitones; a small sized drop of about 2 semitones.The results suggest that the three sizes of pitch drop have different indica-tions in Chinese intonation,depending on both the tone and the tone combination.In perception,there are various ways to realize tone-3 focus in the Tx-T3-Ty sentences series,but in production or for text-to-speech synthesis,the rule simply is making a middle sized pitch drop with a long and creaky T3 syllable.Similarly,to focus on the low tone syllable in the T3-Tx-Ty sentences,a creaky T3 syllable is essential.However,a long T3 syllable is a strong determinant for a low tone focus in the Tx-Ty-T3 sentences.
Design, realization and structural testing of a compliant adaptable wing
Molinari, G.; Quack, M.; Arrieta, A. F.; Morari, M.; Ermanni, P.
2015-10-01
This paper presents the design, optimization, realization and testing of a novel wing morphing concept, based on distributed compliance structures, and actuated by piezoelectric elements. The adaptive wing features ribs with a selectively compliant inner structure, numerically optimized to achieve aerodynamically efficient shape changes while simultaneously withstanding aeroelastic loads. The static and dynamic aeroelastic behavior of the wing, and the effect of activating the actuators, is assessed by means of coupled 3D aerodynamic and structural simulations. To demonstrate the capabilities of the proposed morphing concept and optimization procedure, the wings of a model airplane are designed and manufactured according to the presented approach. The goal is to replace conventional ailerons, thus to achieve controllability in roll purely by morphing. The mechanical properties of the manufactured components are characterized experimentally, and used to create a refined and correlated finite element model. The overall stiffness, strength, and actuation capabilities are experimentally tested and successfully compared with the numerical prediction. To counteract the nonlinear hysteretic behavior of the piezoelectric actuators, a closed-loop controller is implemented, and its capability of accurately achieving the desired shape adaptation is evaluated experimentally. Using the correlated finite element model, the aeroelastic behavior of the manufactured wing is simulated, showing that the morphing concept can provide sufficient roll authority to allow controllability of the flight. The additional degrees of freedom offered by morphing can be also used to vary the plane lift coefficient, similarly to conventional flaps. The efficiency improvements offered by this technique are evaluated numerically, and compared to the performance of a rigid wing.
Preparations for the IGS realization of ITRF2014
Rebischung, Paul; Schmid, Ralf
2016-04-01
The International GNSS Service (IGS) currently prepares its own realization, called IGS14, of the latest release of the International Terrestrial Reference Frame (ITRF2014). This preparation involves: - a selection of the most suitable reference frame (RF) stations from the complete set of GNSS stations in ITRF2014; - the design of a well-distributed core network of RF stations for the purpose of aligning global GNSS solutions; - a re-evaluation of the GPS and GLONASS satellite antenna phase center offsets (PCOs), based on the SINEX files provided by the IGS Analysis Centers (ACs) in the frame of the second IGS reprocessing campaign repro2. This presentation will first cover the criteria used for the selection of the IGS14 and IGS14 core RF stations as well as preliminary station selection results. We will then use the preliminary IGS14 RF to re-align the daily IGS combined repro2 SINEX solutions and study the impact of the RF change on GNSS-derived geodetic parameter time series. In a second part, we will focus on the re-evaluation of the GNSS satellite antenna PCOs. A re-evaluation of at least their radial (z) components is indeed required, despite the negligible scale difference between ITRF2008 and ITRF2014, because of modeling changes recently introduced within the IGS which affect the scale of GNSS terrestrial frames (Earth radiation pressure, antenna thrust). Moreover, the 13 GPS and GLONASS satellites launched since September 2012 are currently assigned preliminary block-specific mean PCO values which need to be updated. From the daily AC repro2 SINEX files, we will therefore derive time series of satellite z-PCO estimates and analyze the resulting time series. Since several ACs provided all three components of the satellite PCOs in their SINEX files, we will additionally derive similar x- and y-PCO time series and discuss the relevance of their potential re-evaluation.
Principles to Products: Toward Realizing MOS 2.0
Bindschadler, Duane L.; Delp, Christopher L.
2012-01-01
This is a report on the Operations Revitalization Initiative, part of the ongoing NASA-funded Advanced Multi-Mission Operations Systems (AMMOS) program. We are implementing products that significantly improve efficiency and effectiveness of Mission Operations Systems (MOS) for deep-space missions. We take a multi-mission approach, in keeping with our organization's charter to "provide multi-mission tools and services that enable mission customers to operate at a lower total cost to NASA." Focusing first on architectural fundamentals of the MOS, we review the effort's progress. In particular, we note the use of stakeholder interactions and consideration of past lessons learned to motivate a set of Principles that guide the evolution of the AMMOS. Thus guided, we have created essential patterns and connections (detailed in companion papers) that are explicitly modeled and support elaboration at multiple levels of detail (system, sub-system, element...) throughout a MOS. This architecture is realized in design and implementation products that provide lifecycle support to a Mission at the system and subsystem level. The products include adaptable multi-mission engineering documentation that describes essentials such as operational concepts and scenarios, requirements, interfaces and agreements, information models, and mission operations processes. Because we have adopted a model-based system engineering method, these documents and their contents are meaningfully related to one another and to the system model. This means they are both more rigorous and reusable (from mission to mission) than standard system engineering products. The use of models also enables detailed, early (e.g., formulation phase) insight into the impact of changes (e.g., to interfaces or to software) that is rigorous and complete, allowing better decisions on cost or technical trades. Finally, our work provides clear and rigorous specification of operations needs to software developers, further
Principles to Products: Toward Realizing MOS 2.0
Bindschadler, Duane L.; Delp, Christopher L.
2012-01-01
This is a report on the Operations Revitalization Initiative, part of the ongoing NASA-funded Advanced Multi-Mission Operations Systems (AMMOS) program. We are implementing products that significantly improve efficiency and effectiveness of Mission Operations Systems (MOS) for deep-space missions. We take a multi-mission approach, in keeping with our organization's charter to "provide multi-mission tools and services that enable mission customers to operate at a lower total cost to NASA." Focusing first on architectural fundamentals of the MOS, we review the effort's progress. In particular, we note the use of stakeholder interactions and consideration of past lessons learned to motivate a set of Principles that guide the evolution of the AMMOS. Thus guided, we have created essential patterns and connections (detailed in companion papers) that are explicitly modeled and support elaboration at multiple levels of detail (system, sub-system, element...) throughout a MOS. This architecture is realized in design and implementation products that provide lifecycle support to a Mission at the system and subsystem level. The products include adaptable multi-mission engineering documentation that describes essentials such as operational concepts and scenarios, requirements, interfaces and agreements, information models, and mission operations processes. Because we have adopted a model-based system engineering method, these documents and their contents are meaningfully related to one another and to the system model. This means they are both more rigorous and reusable (from mission to mission) than standard system engineering products. The use of models also enables detailed, early (e.g., formulation phase) insight into the impact of changes (e.g., to interfaces or to software) that is rigorous and complete, allowing better decisions on cost or technical trades. Finally, our work provides clear and rigorous specification of operations needs to software developers, further
Realizing the promise of competency-based medical education.
Holmboe, Eric S
2015-04-01
Competency-based medical education (CBME) places a premium on both educational and clinical outcomes. The Milestones component of the Next Accreditation System represents a fundamental change in medical education in the United States and is part of the drive to realize the full promise of CBME. The Milestones framework provides a descriptive blueprint in each specialty to guide curriculum development and assessment practices. From the beginning of the Outcomes project in 1999, the Accreditation Council for Graduate Medical Education and the larger medical education community recognized the importance of improving their approach to assessment. Work-based assessments, which rely heavily on the observations and judgments of clinical faculty, are central to a competency-based approach. The direct observation of learners and the provision of robust feedback have always been recognized as critical components of medical education, but CBME systems further elevate their importance. Without effective and frequent direct observation, coaching, and feedback, the full potential of CBME and the Milestones cannot be achieved. Furthermore, simply using the Milestones as end-of-rotation evaluations to "check the box" to meet requirements undermines the intent of an outcomes-based accreditation system. In this Commentary, the author explores these challenges, addressing the concerns raised by Williams and colleagues in their Commentary. Meeting the assessment challenges of the Milestones will require a renewed commitment from institutions to meet the profession's "special obligations" to patients and learners. All stakeholders in graduate medical education must commit to a professional system of self-regulation to prepare highly competent physicians to fulfill this social contract.
Huang, Yuanyuan; Hou, Panyu; Yuan, Xinxing; Chang, Xiuying; Zu, Chong; He, Li; Duan, Luming; CenterQuantum Information, IIIS, Tsinghua University, Beijing 100084, PR China Team; Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA Team
2016-05-01
Quantum teleportation is of great importance to various quantum technologies, and has been realized between light beams, trapped atoms, superconducting qubits, and defect spins in solids. Here we report an experimental demonstration of quantum teleportation from light beams to vibrational states of a macroscopic diamond under ambient conditions. In our experiment, the ultrafast laser technology provides the key tool for fast processing and detection of quantum states within its short life time in macroscopic objects consisting of many strongly interacting atoms that are coupled to the environment, and finally we demonstrate an average teleportation fidelity (90 . 6 +/- 1 . 0) % , clearly exceeding the classical limit of 2/3. Quantum control of the optomechanical coupling may provide efficient ways for realization of transduction of quantum signals, processing of quantum information, and sensing of small mechanical vibrations. Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, PR China.
Experimental Realization of Braunstein's Weight-Decision Algorithm
HOU Shi-Yao; CUI Jing-Xin; LI Jun-Lin
2011-01-01
Braunstein proposed an Algorithm to distinguish the Boolean functions of two different weights. Here we implement the algorithm in a two-qubit nuclear magnetic resonance quantum information processor. The experiment shows that the algorithm could distinguish the Boolean functions of two different weights efficiently.%@@ Braunstein proposed an algorithm to distinguish the Boolean functions of two different weights.Here we imple-ment the algorithm in a two-qubit nuclear magnetic resonance quantum information processor.The experiment shows that the algorithm could distinguish the Boolean functions of two different weights efficiently.
A new mechanism to design transparent electrodes: THz realizations
Song, Zhengyong; Malureanu, Radu; Zalkovskij, Maksim;
2012-01-01
retains the full electric and mechanical properties of a natural metal. The present mechanism is insensitive to structural disorders and broad variation of incidence angles. Meanwhile, we performed proof-of-concept experiments in the terahertz domain to verify our theoretical predictions, using carefully...... designed metamaterials to mimic plasmonic metals in optical regime. Experiments are in excellent agreements with full-wave simulations....... of the metallic one, we found that the back-scattering from the metallic film can be almost perfectly canceled by the composite layer under certain conditions, leading to transparency of the whole structure. Since our mechanism does not require any openings on the opaque metallic plate, the proposed structure...
吴俊; 胡协和; 陈生; 褚健
2003-01-01
The closed-loop stability issue of finite-precision realizations was investigated for digital controllers implemented in block-floating-point format. The controller coefficient perturbation was analyzed resulting from using finite word length (FWL) block-floating-point representation scheme. A block-floating-point FWL closed-loop stability measure was derived which considers both the dynamic range and precision. To facilitate the design of optimal finite-precision controller realizations, a computationally tractable block-floating-point FWL closed-loop stability measure was then introduced and the method of computing the value of this measure for a given controller realization was developed. The optimal controller realization is defined as the solution that maximizes the corresponding measure, and a numerical optimization approach was adopted to solve the resulting optimal realization problem. A numerical example was used to illustrate the design procedure and to compare the optimal controller realization with the initial realization.
吴俊; 胡协和; 陈生; 褚健
2003-01-01
The closed-loop stability issue of finite-precision realizations was investigated for digital control-lers implemented in block-floating-point format. The controller coefficient perturbation was analyzed resultingfrom using finite word length (FWL) block-floating-point representation scheme. A block-floating-point FWL closed-loop stability measure was derived which considers both the dynamic range and precision. To facilitate the design of optimal finite-precision controller realizations, a computationally tractable block-floating-point FWL closed-loop stability measure was then introduced and the method of computing the value of this measure for a given controller realization was developed. The optimal controller realization is defined as the solution that maximizes the corresponding measure, and a numerical optimization approach was adopted to solve the resulting optimal realization problem. A numerical example was used to illustrate the design procedure and to compare the optimal controller realization with the initial realization.
Synchronous Control Method and Realization of Automated Pharmacy Elevator
Liu, Xiang-Quan
Firstly, the control method of elevator's synchronous motion is provided, the synchronous control structure of double servo motor based on PMAC is accomplished. Secondly, synchronous control program of elevator is implemented by using PMAC linear interpolation motion model and position error compensation method. Finally, the PID parameters of servo motor were adjusted. The experiment proves the control method has high stability and reliability.
Realization of quantum discrete Fourier transform with NMR
无
2000-01-01
The pulse sequences of the logic operations used in quantum discrete Fourier transform are designed for the experiment of nuclear magnetic resonance(NMR), and 2-qubit discrete Fourier transforms are implemented experimentally with NMR. The experimental errors are examined and methods for reducing the errors are proposed.
Realization of electrically tunable single quantum dot nanocavities
Hofbauer, Felix Florian Georg
2009-03-15
We investigated the design, fabrication and optical investigation of electrically tunable single quantum dot-photonic crystal defect nanocavities operating in both the weak and strong coupling regimes of the light matter interaction. We demonstrate that the quantum confined Stark effect can be employed to quickly and reversibly switch the dot-cavity coupling, simply by varying a gate voltage. Our results show that exciton transitions from individual dots can be tuned by up to {proportional_to}4 meV relative to the nanocavity mode, before the emission quenches due to carrier tunneling escape from the dots. We directly probe spontaneous emission, irreversible polariton decay and the statistics of the emitted photons from a single-dot nanocavity in the weak and strong coupling regimes. New information is obtained on the nature of the dot-cavity coupling in the weak coupling regime and electrical control of zero dimensional polaritons is demonstrated for the first time. The structures investigated are p-i-n photodiodes consisting of an 180nm thick free-standing GaAs membrane into which a two dimensional photonic crystal is formed by etching a triangular lattice of air holes. Low mode volume nanocavities (V{sub mode}<1.6 ({lambda}/n){sup 3}) are realized by omitting 3 holes in a line to form L3 cavities and a single layer of InGaAs self-assembled quantum dots is embedded into the midpoint of the membrane. The nanocavities are electrically contacted via 35 nm thick p- and n-doped contact layers in the GaAs membrane. In the weak coupling regime, time resolved spectroscopy reveals a {proportional_to}7 x shortening of the spontaneous emission lifetime as the dot is tuned through the nanocavity mode, due to the Purcell effect. Upon strongly detuning the same quantum dot transition from the nanocavity mode we observe an additional {proportional_to}8 x lengthening of the spontaneous emission lifetime. These observations unequivocally highlight two regimes of dot
GRAPHIC REALIZATION FOUNDATIONS OF LOGIC-SEMANTIC MODELING IN DIDACTICS
V. E. Steinberg
2017-01-01
Full Text Available Introduction. Nowadays, there are not a lot of works devoted to a graphic method of logic-semantic modeling of knowledge. Meanwhile, an interest towards this method increases due to the fact of essential increase of the content of visual component in information and educational sources. The present publication is the authors’ contribution into the solution of the problem of search of new forms and means convenient for visual and logic perception of a training material, its assimilation, operating by elements of knowledge and their transformations.The aim of the research is to justify graphical implementation of the method of logic-semantic modeling of knowledge, presented by a natural language (training language and to show the possibilities of application of figurative and conceptual models in student teaching.Methodology and research methods. The research methodology is based on the specified activity-regulatory, system-multi-dimensional and structural-invariant approach and the principle of multidimensionality. The methodology the graphic realization of the logic-semantic models in learning technologies is based on didactic design using computer training programs.Results and scientific novelty. Social and anthropological-cultural adaptation bases of the method of logical-semantic knowledge modeling to the problems of didactics are established and reasoned: coordinate-invariant matrix structure is presented as the basis of logical-semantic models of figurative and conceptual nature; the possibilities of using such models as multifunctional didactic regulators – support schemes, navigation in the content of the educational material, educational activities carried out by navigators, etc., are shown. The characteristics of new teaching tools as objects of semiotics and didactic of regulators are considered; their place and role in the structure of the external and internal training curricula learning activities are pointed out
Development and realization of the microsystem for energy-saving food storage MIZEL
Grassnick, R.; Traenkler, H.R. [Universitaet der Bundeswehr Muenchen, Neubiberg (Germany). Inst. fuer Mess- und Automatisierungstechnik; Geissler, C. [Indatec GmbH, Bernau (Germany); Heinze, M. [Infra Tec GmbH, Dresden (Germany)
2001-07-01
A prototype of an advanced food storage system for private households has been developed and realized. It is used in order to validate experiments, which acknowledge the fact that food remain fresh, if it is stored at certain humidity values. The design, development, and realization of the food container took place in several steps: the fundamental studies at an experimental model with a PC development environment by the IMA, the upgrading in surface mounted technology (SMT) by the indatec GmbH, the upgrading in micro system technology (MST) by the infratec GmbH, and the test of the total system by the IMA. To make the system energy-autonomous, it is supplied by solar cells. Due to the fact that the system is dependent on light a special power management and an energy-saving control algorithm have been designed and low power consuming components have been used. The air humidity inside the container can be changed by opening and closing a ventilation flap actuator. A capacity sensor is used for the measurement of the air humidity. The measurement of the temperature by a thermistor (NTC) serves the compensation of the temperature dependence of this humidity sensor. The signals of both sensors are converted by a switched-capacitor interface. The frequency signals produced this way, which are proportional to air humidity and to temperature respectively are fed back to a microcontroller. Using these signals, the exact humidity in the container is calculated and compared with the desired humidity. The difference signal operates a controller that positions the ventilation flap on the front of the container. The SMT version of the power management and the sensor-actuator-interface as well as a MST component, which includes the sensors and the signal processing hardware around the microcontroller, are closer regarded and explained in detail. (orig.)
Mechanisms of realization of THz-waves of nitrogen oxide occurrence physiological effects
Vyacheslav F. Kirichuk
2013-11-01
Full Text Available In this review, there is generalized material of many experimental researches in interaction of THz-waves molecular emission and absorption spectrum (MEAS of nitrogen oxide occurrence with bioobjects. Thrombocytes and experimental animals were used as bioobjects. The experiments let indicate changes caused by THz-waves: at the cellular, tissular, system, organismic levels. There are all data of changes in physiological mechanisms of reglations at all levels: autocrine, paracrine, endocrine and nervous. There is a complex overview of experimental material firstly performed in the article. There had been shown that the effect of THz-waves of the given occurrence is realized by the changed activity of nitroxidergic system. It had been proved that THz-waves of nitrogen oxide occurrence can stimulate nitrogen oxide producing in organs and tissues in condition of its low concentration. Possible mechanisms of antiaggregative effect of the given waves had been described. There had been shown the possibility of regulating of vascular tone and system hemodynamics with the help of the studying these frequencies. The represented data of lipid peroxidation and enzymatic and nonenzymatic components of organism system under the influence of THz-waves of nitrogen oxide occurrence in stress conditions. Besides, there were shown changes of stress-regulating system activity and in concentration of important mediators - catecholamines and glucocorticosteroids. These data let characterize mechanism of realization of THz-waves basic effects. The research had shown the possibility of THz-waves of nitrogen oxide occurrence usage as a method of natural physiological noninvasive regulation of significant organism functions.
Ohyanagi, Toshio; Sengoku, Yasuhito
2010-02-01
This article presents a new solution for measuring accurate reaction time (SMART) to visual stimuli. The SMART is a USB device realized with a Cypress Programmable System-on-Chip (PSoC) mixed-signal array programmable microcontroller. A brief overview of the hardware and firmware of the PSoC is provided, together with the results of three experiments. In Experiment 1, we investigated the timing accuracy of the SMART in measuring reaction time (RT) under different conditions of operating systems (OSs; Windows XP or Vista) and monitor displays (a CRT or an LCD). The results indicated that the timing error in measuring RT by the SMART was less than 2 msec, on average, under all combinations of OS and display and that the SMART was tolerant to jitter and noise. In Experiment 2, we tested the SMART with 8 participants. The results indicated that there was no significant difference among RTs obtained with the SMART under the different conditions of OS and display. In Experiment 3, we used Microsoft (MS) PowerPoint to present visual stimuli on the display. We found no significant difference in RTs obtained using MS DirectX technology versus using the PowerPoint file with the SMART. We are certain that the SMART is a simple and practical solution for measuring RTs accurately. Although there are some restrictions in using the SMART with RT paradigms, the SMART is capable of providing both researchers and health professionals working in clinical settings with new ways of using RT paradigms in their work.
Realization of Miniaturized Multi-/Wideband Microwave Front-Ends
Al Shamaileh, Khair A.
the conventional design with NTLs of wideband matching nature. To bring this concept into practice, the equivalent transmission line model is used for profiling impedance variations. The proposed technique leads to flexible spectrum allocation and matching level. Moreover, the resulting structures are compact and planar. First, the analytical results of three 3-way BPDs of different fractional bandwidths are presented and discussed to validate the proposed approach. Then, two examples of 3- and 5-way BPDs with bandwidths of 4--10 GHz and 5--9 GHz, respectively, are simulated, fabricated, and measured. Simulated and measured results show an acceptable input port matching of below --15 dB and --12.5 dB for the 3- and 5-way dividers, respectively, over the bands of interest. The resulting transmission parameters of the 3- and 5-way dividers are --4.77+/-;1 dB and --7+/-1 dB, respectively, over the design bands; which are in close proximity to their theoretical values. The proposed wideband BPD dividers find many applications in microwave front-end circuitry, especially in only-transmitting antenna subsystems, such as multi-/broad-cast communications, where neither output ports matching nor isolation is a necessity. The third proposed component is a 90° hybrid branch-line coupler (BLC) with multi-/wideband frequency matching. To obtain a multi-frequency operation, NTLs of lengths equal to those in the conventional design are incorporated through the even- and odd-mode analysis. The proposed structure is relatively simple and is fabricated on a single-layered substrate. Two design examples of dual-/triple-frequency BLCs suitable for GSM, WLAN, and Wi-Fi applications are designed, fabricated and evaluated experimentally to validate the proposed methodology. The same concept is extended to realize a broadband BLC with arbitrary coupling levels. Based on how impedances are profiled, the fractional bandwidth of a single-section 90° 3-dB BLC is extended to 57%, and the
How to quantify realization of WFD-objectives of groundwater resources?
van den Brink, Cors; Wuijts, Susanne; Boekhold, Sandra
2016-04-01
Groundwater is a major resource for drinking water in the Netherlands . Evaluation of the EU Water Framework Directive (EU-WFD) showed that protection of this valuable resource needs improval. Drinking Water Protection Files were set up to assess risks and identify actions needed regarding the identification and implementation of measures enhancing the protection level of groundwater resources in groundwater protection areas. Evaluation of these first generation protection files showed several issues for further improvement, among others on effectiveness of measures. In workshops we analyzed and discussed the feasibility to quantify the impact of measures by combining information on groundwater quality with experiences of stakeholders with success and failure factors. Although there is still a way to go in the quantification of the impact of measures regarding the EU-WFD objectives, these workshops contributed to insight in i) the joint experience we gained on measures and their implementation at different spatial scales, ii) the distribution of the measures over identified risks (i.e. nitrate, pesticides and emerging contaminants) and iii) the estimated contribution of methods to reach the WFD objectives and knowledge gaps. From discussions in the national working group on protection files, it became clear that this analysis is a valuable first step in prioritizing and implementing the measures. Adequate monitoring of implemented measures will additionally contribute to a more quantitative assessment of the realization of the objectives of groundwater resources.
The Challenges of Realization in a Global Civilization
James Winston Morris
2011-12-01
Full Text Available The contemporary historical situation suggests fascinating parallels with that period of the 13th/7th century when the massive destruction of the Mongol invasions opened the way for popular new forms of Islamic life and practice that eventually spread Islam throughout Asia. Today, as in earlier periods of dramatic upheaval, we can witness those processes of inspiration and awakening that give rise to the spiritual pathways of future centuries, through each soul’s gradual discovery of its unique challenges and demands of ihsan.One way of describing this transformation, to use the Qur’anic language adapted by Ibn ‘Arabi, is in the terms of the process of spiritual realization (tahqīq by which people discover their guiding inner relationship to those divine qualities or “Names” that eventually come to deﬁne the meaning and purpose of their lives. Through our life long movement of service (‘ibda to the “Lord” (rabb constituted by each divine Name, the transformation of the soul follows a familiar, naturally ascending trajectory. It begins with a curiosity drawing us toward some particular dimension of the Real (al-Haqq; then a compelling striving leading to heightened discipline and awareness; and ultimately to the creative manifestation of that devotion through the appropriate means of teaching, communication, and new communities of fellow- seekers—the Qur’anic “servants of the All-Merciful”—that slowly emerge from this shared spiritual work of devotion, discovery and creative response. Here we point to some ways this process of civilizational renewal is unfolding around the world, focusing on three of the most far-reaching of those divine Names: the “servants of the All-Wise” (al-Hakīm, in their exploring and deciphering the inﬁnite Signs of God’s Wisdom “on the horizons”, in all of the sciences of nature and society; to those muhsinūn and “servants of the Beautiful” (al-Jamīl whose
Technology Used for Realization of the Reform in Informal Areas.
Qirko, K.
2008-12-01
ORGANIZATION OF STRUCTURE AND ADMINISTRATION OF ALUIZNI Law no. 9482, date 03.03.2006 " On legalization, urban planning and integration of unauthorized buildings", entered into force on May 15, 2006. The Council of Ministers, with its decision no.289, date 17.05.2006, established the Agency for the Legalization, Urbanization, and Integration of the Informal Zones/Buildings (ALUIZNI), with its twelve local bodies. ALUIZNI began its activity in reliance to Law no. 9482, date 03.03.2006 " On legalization, urban planning and integration of unauthorized buildings", in July 2006. The administration of this agency was completed during this period and it is composed of; General Directory and twelve regional directories. As of today, this institution has 300 employees. The administrative structure of ALUIZNI is organized to achieve the objectives of the reform and to solve the problems arising during its completion. The following sectors have been established to achieve the objectives: Sector of compensation of owners; sector of cartography, sector of geographic system data elaboration (GIS) and Information Technology; sector of urban planning; sector of registration of legalized properties and Human resource sector. Following this vision, digital air photography of the Republic of Albania is in process of realization, from which we will receive, for the first time, orthophoto and digital map, unique for the entire territory of our country. This cartographic product, will serve to all government institutions and private ones. All other systems, such as; system of territory management; system of property registration ; system of population registration; system of addresses; urban planning studies and systems; definition of boundaries of administrative and touristic zones will be established based on this cartographic system. The cartographic product will be of parameters mentioned below, divided in lots:(2.3 MEuro) 1.Lot I: It includes the urban zone, 1200 km2. It will have
A Fast π/4-DQPSK Demodulation Arithmetic and Realization
ZHOU Guo-yong; ZHONG Hong-sheng; WANG Jun-mei
2004-01-01
The modulated signals of π /4-DQPSK can be demodulated with the differenced method,and the technology has been used in the communication. The traditional demodulated method needs a lot of calculation. In this paper, a new method based on fast arithmetic digital demodulation of DQPSK is presented. The new method only uses the sign of the modulated signal instead of digital signal through the A/D in the traditional method. With the new method, the system has higher speed, and can save some hardware in the FPGA. An experiment of the new method with the DQPSK is given in this paper.
Theoretical Prediction and Experimental Realization of Missing Materials
Zakutayev, A.; Zhang, X.; Nagaraja, A.; Yu, L.; Lany, S.; Mason, T. O.; Ginley, D. S.; Zunger, A.
2013-01-01
Many chemically reasonable inorganic materials are missing from databases or literature. Two possible reasons are: (1) these materials are unstable; (2) they have been simply overlooked. Here we applied Inverse Design approach to systematically screen V-IX-IV group of 45 ternary ABX materials. High-throughput theory revealed 9 hitherto missing stable materials in this family. Combinatorial experiment synthesized one of them TaCoSn and discovered another one TaCo2Sn, the first two reported ternaries in this chemical system. This example illustrates the promise of computationally driven experimental inorganic materials chemistry.
Realizations of $\\kappa$-Minkowski space, Drinfeld twists and related symmetry algebras
Juric, Tajron; Pikutic, Danijel
2015-01-01
Realizations of $\\kappa$-Minkowski space linear in momenta are studied for time-, space- and light-like deformations. We construct and classify all such linear realizations and express them in terms of $\\mathfrak{gl}(n)$ generators. There are three one-parameter families of linear realizations for time-like and space-like deformations, while for light-like deformations, there are only four linear realizations. The relation between deformed Heisenberg algebra, star product, coproduct of momenta and twist operator is presented. It is proved that for each linear realization there exists Drinfeld twist satisfying normalization and cocycle conditions. $\\kappa$-deformed $\\mathfrak{igl}(n)$-Hopf algebras are presented for all cases. The $\\kappa$-Poincar\\'e-Weyl and $\\kappa$-Poincar\\'e-Hopf algebras are discussed. Left-right dual $\\kappa$-Minkowski algebra is constructed from the transposed twists. The corresponding realizations are nonlinear. All known Drinfeld twists related to $\\kappa$-Minkowski space are obtained...
Bollerslev, Tim; Gibson, Michael; Zhou, Hao
This paper proposes a method for constructing a volatility risk premium, or investor risk aversion, index. The method is intuitive and simple to implement, relying on the sample moments of the recently popularized model-free realized and option-implied volatility measures. A small-scale Monte Car...... relate to a set of macro-finance state variables. We also find that the extracted volatility risk premium helps predict future stock market returns.......This paper proposes a method for constructing a volatility risk premium, or investor risk aversion, index. The method is intuitive and simple to implement, relying on the sample moments of the recently popularized model-free realized and option-implied volatility measures. A small-scale Monte Carlo...... experiment confirms that the procedure works well in practice. Implementing the procedure with actual S&P500 option-implied volatilities and high-frequency five-minute-based realized volatilities indicates significant temporal dependencies in the estimated stochastic volatility risk premium, which we in turn...
System Realization of Broad Band Digital Beam Forming for Digital Array Radar
Wang Feng
2013-09-01
Full Text Available Broad band Digital Beam Forming (DBF is the key technique for the realization of Digital Array Radar (DAR. We propose the method of combination realization of the channel equalization and DBF time delay filter function by using adaptive Sample Matrix Inversion algorithm. The broad band DBF function is realized on a new DBF module based on parallel fiber optic engines and Field Program Gate Array (FPGA. Good performance is achieved when it is used to some radar products.
Why benefits realization from ERP in SMEs doesn't seem to matter?
Haddara, Moutaz; Päivärinta, Tero
2011-01-01
It is often argued that IT investments require active management practices for benefits realization. This applies also to enterprise resource planning (ERP) systems. As well, benefits realization efforts are assumed to create more value than they cost. Hence, the maturity of organizations should be increased and their cultures cultivated towards more rational benefits realization practices. Our study on ERP implementations in Egyptian medium-sized organizations, however, provides aberrant res...
Large-scale portfolios using realized covariance matrix: evidence from the Japanese stock market
Masato Ubukata
2010-01-01
This paper examines effects of realized covariance matrix estimators based on high-frequency data on large-scale minimum-variance equity portfolio optimization. The main results are: (i) the realized covariance matrix estimators yield a lower standard deviation of large-scale portfolio returns than Bayesian shrinkage estimators based on monthly and daily historical returns; (ii) gains to switching to strategies using the realized covariance matrix estimators are higher for an investor with hi...
Large-scale portfolios using realized covariance matrix: evidence from the Japanese stock market
Masato Ubukata
2009-01-01
The objective of this paper is to examine effects of realized covariance matrix estimators based on intraday returns on large-scale minimum-variance equity portfolio optimization. We empirically assess out-of-sample performance of portfolios with different covariance matrix estimators: the realized covariance matrix estimators and Bayesian shrinkage estimators based on the past monthly and daily returns. The main results are: (1) the realized covariance matrix estimators using the past intrad...
Fifteen Years of Cold Matter on the Atom Chip: Promise, Realizations, and Prospects
Keil, Mark; Zhou, Shuyu; Groswasser, David; Japha, Yonathan; Folman, Ron
2016-01-01
Here we review the field of atom chips in the context of Bose-Einstein Condensates (BEC) as well as cold matter in general. Twenty years after the first realization of the BEC and fifteen years after the realization of the atom chip, the latter has been found to enable extraordinary feats: from producing BECs at a rate of several per second, through the realization of matter-wave interferometry, and all the way to novel probing of surfaces and new forces. In addition, technological applications are also being intensively pursued. This review will describe these developments and more, including new ideas which have not yet been realized.
Fifteen years of cold matter on the atom chip: promise, realizations, and prospects
Keil, Mark; Amit, Omer; Zhou, Shuyu; Groswasser, David; Japha, Yonathan; Folman, Ron
2016-10-01
Here we review the field of atom chips in the context of Bose-Einstein Condensates (BEC) as well as cold matter in general. Twenty years after the first realization of the BEC and 15 years after the realization of the atom chip, the latter has been found to enable extraordinary feats: from producing BECs at a rate of several per second, through the realization of matter-wave interferometry, and all the way to novel probing of surfaces and new forces. In addition, technological applications are also being intensively pursued. This review will describe these developments and more, including new ideas which have not yet been realized.
Kurashova V.A.
2010-05-01
Full Text Available This article analyzes experience of practical realization idea of independence in the gymnasia training in the history of domestic gymnasiums in the period of reformation content of training in gymnasiums - at the end of XIX century. Finds out that in the period which is under investigation practical forms and methods of gymnasium training were spreading. Were imposed disciplines of natural direction (looking out in the nature, natural researching. Content and methods of studying classical disciplines have got publishing newspapers by schoolchildren, coincided methods of training Latin and native language.
Olhova-Marchuk N.V.
2011-05-01
Full Text Available Educational potential of contents of the subject «Physical culture» and its extramural kinds in formation of inter-personalities relations of younger schoolchildren is revealed. The pupils of 1-4 class took part in the experiment. It is exposed that the problem of culture formation of inter-personalities relations needs looking for new methods of its solution. It is proved that formation of inter-personalities relations of younger children is actively realized in the process of physical education.
Low energy buildings – the basis for realizing the strategy for independency of fossil fuels in 2050
Svendsen, Svend
2011-01-01
The paper introduces how low energy buildings can be developed, designed, optimized, constructed and operated in the future and thereby make a significant contribution to the realization of aim of the energy policy of EU: to become independent of fossil fuels in 2050. The paper describes how low ...... without use of fossil fuels can be accomplished by the building sector by 2020. The building sector may in the process be transformed from an experience based sector to knowledge and research based sector with high quality sustainable products and very good business....
Experimental realization of one-way quantum computing with two-photon four-qubit cluster states.
Chen, Kai; Li, Che-Ming; Zhang, Qiang; Chen, Yu-Ao; Goebel, Alexander; Chen, Shuai; Mair, Alois; Pan, Jian-Wei
2007-09-21
We report an experimental realization of one-way quantum computing on a two-photon four-qubit cluster state. This is accomplished by developing a two-photon cluster state source entangled both in polarization and spatial modes. With this special source, we implemented a highly efficient Grover's search algorithm and high-fidelity two-qubit quantum gates. Our experiment demonstrates that such cluster states could serve as an ideal source and a building block for rapid and precise optical quantum computation.
Sun, Ziheng; Fang, Hui; Di, Liping; Yue, Peng
2016-09-01
It was an untouchable dream for remote sensing experts to realize total automatic image classification without inputting any parameter values. Experts usually spend hours and hours on tuning the input parameters of classification algorithms in order to obtain the best results. With the rapid development of knowledge engineering and cyberinfrastructure, a lot of data processing and knowledge reasoning capabilities become online accessible, shareable and interoperable. Based on these recent improvements, this paper presents an idea of parameterless automatic classification which only requires an image and automatically outputs a labeled vector. No parameters and operations are needed from endpoint consumers. An approach is proposed to realize the idea. It adopts an ontology database to store the experiences of tuning values for classifiers. A sample database is used to record training samples of image segments. Geoprocessing Web services are used as functionality blocks to finish basic classification steps. Workflow technology is involved to turn the overall image classification into a total automatic process. A Web-based prototypical system named PACS (Parameterless Automatic Classification System) is implemented. A number of images are fed into the system for evaluation purposes. The results show that the approach could automatically classify remote sensing images and have a fairly good average accuracy. It is indicated that the classified results will be more accurate if the two databases have higher quality. Once the experiences and samples in the databases are accumulated as many as an expert has, the approach should be able to get the results with similar quality to that a human expert can get. Since the approach is total automatic and parameterless, it can not only relieve remote sensing workers from the heavy and time-consuming parameter tuning work, but also significantly shorten the waiting time for consumers and facilitate them to engage in image
Realization of spatial compliant virtual fixture using eigenscrews.
Zhang, Dongwen; Wang, Lei; Gu, Jia; Li, Zhicheng; Chen, Ken
2012-01-01
Virtual fixture is kind of assistance mechanism to limit movement into restricted regions and/or guide movement along desired trajectories in human-machine interactive operation. The structure of geometric and dynamic constraints of reference tasks is analyzed using screw theory. End-effector and the reference frame are elastically coupled by virtual screw springs, which slides along the reference sequences. An allowable motion screw set is constructed, from which the desired spatial compliance and stiffness matrices are synthesized from an allowable motion screw set. The presented virtual fixture are implemented dynamic contour tracking experiment, the effects of control parameters on system performance are also analyzed. The proposed virtual fixtures unites rotation and translation motions, and filter out task-unrelated components from the manual input while augmenting task-related components.
Meta-realization in Horney and the teaching of psychoanalysis.
Danielian, Jack
2010-03-01
Horney was the first psychoanalyst to develop a comprehensive framework for understanding character structure and character pathology, and the first to do so in experience-near terms. She uncovered the often hidden metapsychological assumptions of classical analysis and created a deeper meta-level thinking about psychological splits, including how splits can develop between assumed opposites. In the clinical moment, insight into meta-level process rests on an epistemological change in the relation between subjective and objective. Horney was an early pioneer in examining the dialectical unity of these presumed opposites. A specific proposal for training and teaching candidates in the science of subjectivity will be advanced. Systemic clinical insights in the assessment and treatment of patients are offered, as well as systemic uncovering of cultural assumptions of Western society which can impede analytic exploration of psychic conflict.
Experimental Realization of a Thermal Squeezed State of Levitated Optomechanics
Rashid, Muddassar; Tufarelli, Tommaso; Bateman, James; Vovrosh, Jamie; Hempston, David; Kim, M. S.; Ulbricht, Hendrik
2016-12-01
We experimentally squeeze the thermal motional state of an optically levitated nanosphere by fast switching between two trapping frequencies. The measured phase-space distribution of the center of mass of our particle shows the typical shape of a squeezed thermal state, from which we infer up to 2.7 dB of squeezing along one motional direction. In these experiments the average thermal occupancy is high and, even after squeezing, the motional state remains in the remit of classical statistical mechanics. Nevertheless, we argue that the manipulation scheme described here could be used to achieve squeezing in the quantum regime if preceded by cooling of the levitated mechanical oscillator. Additionally, a higher degree of squeezing could, in principle, be achieved by repeating the frequency-switching protocol multiple times.
Do You Realize That in the Year 2000...
Moore, John W.
1999-12-01
This issue's many articles on environmental chemistry reminded me that during the decade following 1965, the year when I began teaching, it was popular to extrapolate various growth curves to the year 2000. Often the results were startling. Projections that world population would double by the end of the century led ecologists to talk of a "population bomb". Problems were anticipated as a result of consumption of limited resources, pollution of air, water, and land, destruction of ecosystems and habitat, increasing poverty and famine, and other environmental or social issues. Arguments for action were often prefaced by "Do you realize that in the year 2000...". In 1970 this was a striking way to point out that rates of change were accelerating and that change is not necessarily beneficial. With the year 2000 on our doorstep, it is appropriate to revisit the 1960s and 1970s, looking for milestones that mark not only problems but also progress. A little reflection reveals that chemistry has contributed to alleviating many of the problems, and substantial progress has been made in chemistry and chemical education. Instrumentation now plays a far more important role. When I was an undergraduate, my student colleagues and I complained that we were not permitted to use the department's brand new IR spectrophotometer to help solve our qual organic unknowns. When I was a graduate student, the department's one NMR instrument was operated by a faculty member and reserved for research. In this issue there is a paper about pervasive incorporation of NMR throughout an undergraduate curriculum. Other undergraduate colleges have similar programs - even using NMR in courses for non-science majors. Many other instruments that were to be found only in a few research labs in 1965 are now essential to the education of undergraduates. There are now far more opportunities for face-to-face interactions with others who are interested in chemical education. The first Biennial Conference on
Finger-vein image separation algorithms and realization with MATLAB
Gao, Xiaoyan; Ma, Junshan; Wu, Jiajie
2010-10-01
According to the characteristics of the finger-vein image, we adopted a series of methods to enhance the contrast of the image in order to separate the finger-vein areas from the background areas, and made prepare for the subsequent research such as feature extraction and recognition processing . The method consists of three steps: denoising, contrast enhancement and image binarization. In denoising, considering the relationship between gray levels in the adjacent areas of the finger-vein image, we adopted the Gradient Inverse Weighted Smoothing method. In contrast enhancement, we improved the conventional High Frequency Stress Filtering method and adopted a method which combined the traditional High Frequency Stress Filtering algorithm together with the Histogram Equalization. With this method, the contrast of the finger-vein area and the background area has been enhanced significantly. During the binarization process, after taking the differences of the gray levels between the different areas of the finger-vein image into consideration, we proposed a method which combined the binarization by dividing the image into several segments and the Morphological Image Processing means. Our experiment results show that after a series of processing mentioned above by using MATLAB, the finger-vein areas can be separated from the background areas obviously. We can get a vivid figure of the finger-vein which provided some references for the following research such as finger-vein image feature extraction, matching and identification.
A Proposal of Predictive Reinforcement Learning Realizing Moving Obstacle Avoidance
Takeda, Masato; Nagao, Tomoharu
In recent years, researches on autonomous robots in real life have developed. Especially, moving obstacle avoidance is one of the most important tasks for robots. Reinforcement learning is a typical method of action acquisitions of autonomous mobile robots for obstacle avoidance. However, it has been indicated that reinforcement learning has various problems in unknown environment. In order to solve these problems, we propose predictive reinforcement learning for moving obstacle avoidance. In predictive reinforcement learning, our rules are not defined as a pair of actions and states like conventional reinforcement learning. The rules are defined as the transition of the states by robot action between steps. We think that proposed rules enable robots to adapt to unknown environment because these rules are independent from any environment where moving obstacles exist. The robots implemented these rules predict the next state. After this prediction, the robots reinforce its rules by comparing observed states with predicted ones and foresee collisions on obstacles. Then the robots select safer actions. In this paper, we verify the efficiency of our method in several simulations. First, the robot is trained in learning environment where moving obstacles exist. After that, we experiment to verify the ability of adaptation to unknown environments. As a result, the robot acquires moving obstacle avoidance actions.
Realization of a novel meaningful digital image watermarking scheme
Liu, Hong; Liu, Quan
2007-12-01
In this paper, we propose a novel digital image scheme based on discrete cosine transformation (DCT). The most major difference between the traditional method and the proposed scheme is that it need not embed the watermark image into the original public image. Instead, separating the original image into many 8*8 pixels blocks and making DCT to every block, then extracting the DC(direct current) coefficient of each different block as the feature of the original image, thus we can gain a ownership map according to the feature of the original image and the watermark image. When piracy happens, the copyright owner can reveal his right via the ownership mapping and the feature of the suspected image to extracting the watermarking. In this process, we need not to be in virtue of the original public image. Moreover, the size of the watermark image is not restricted to be smaller than that of the original image. The experiment results are performed to demonstrate the robustness of the proposed scheme against several common attacks.
Can schools realize the learning potential of knowledge management?
Alan Bains
2006-06-01
Full Text Available Abstract: In this position paper, reservations are presented regarding the potential of knowledge management (KM as it is currently applied to the learning and teaching activity of schools. We contend that effective KM is contingent upon the explication of a deep and shared understanding of the learning and teaching process. We argue that the most important transactions in schools, those related to learning and teaching, are frequently the least explicated. Further, where such explication does occur, it is rarely specific enough to generate the kind of meaningful data required to make timely improvements in the learning experience of individual students. Our intent is to inject a cautionary note regarding current conceptualizations of KM in education and to focus the KM discussion on potentially more valid applications in school settings. We offer strategy and examples that can be employed to address the reservations described herein as well as build the kind of professional culture of practice in schools that is more conducive to effective KM.
Experimental realization of two-dimensional boron sheets.
Feng, Baojie; Zhang, Jin; Zhong, Qing; Li, Wenbin; Li, Shuai; Li, Hui; Cheng, Peng; Meng, Sheng; Chen, Lan; Wu, Kehui
2016-06-01
A variety of two-dimensional materials have been reported in recent years, yet single-element systems such as graphene and black phosphorus have remained rare. Boron analogues have been predicted, as boron atoms possess a short covalent radius and the flexibility to adopt sp(2) hybridization, features that favour the formation of two-dimensional allotropes, and one example of such a borophene material has been reported recently. Here, we present a parallel experimental work showing that two-dimensional boron sheets can be grown epitaxially on a Ag(111) substrate. Two types of boron sheet, a β12 sheet and a χ3 sheet, both exhibiting a triangular lattice but with different arrangements of periodic holes, are observed by scanning tunnelling microscopy. Density functional theory simulations agree well with experiments, and indicate that both sheets are planar without obvious vertical undulations. The boron sheets are quite inert to oxidization and interact only weakly with their substrate. We envisage that such boron sheets may find applications in electronic devices in the future.
Experimental realization of two-isotope collision-assisted Zeeman cooling
Hamilton, Mathew
The work presented in this thesis focuses on the demonstration and initial evaluation of a novel non-evaporative cooling method called collision-assisted Zeeman cooling. For this realization, an ultracold gas consisting of a mixture of 87Rb and 85Rb was used. Cooling was accomplished through interisotope inelastic spin-exchange collisions that converted kinetic energy into magnetic energy. Continual optical pumping spin polarized the 85Rb which ensured that only kinetic energy reducing collisions occurred and the scattered pump photons carried entropy out of the system. Thus, cooling of the ultracold gas can be achieved without requiring the loss of any atoms in order to do so. This represents a theoretical advantage over forced evaporative cooling, which is the current state-of-the-art cooling technique in most experiments. This thesis discusses the details of collision-assisted Zeeman cooling, as well as how the theory of the technique has been extended from cooling a single species to cooling with two species. There are many predicted advantages from using two rather than one species of atom in this type of cooling: greater flexibility in finding favorable spin-exchange collision rates, easier requirements on the magnetic fields that must be used, and an additional means to mitigate reabsorption (the primary limitation in many if not most non-evaporative cooling techniques). The experimental considerations needed to prepare a system that simultaneously trapped two isotopes to be able to perform collision-assisted Zeeman cooling are discussed. Because this cooling scheme is highly reliant on the initial conditions of the system, a focused experiment examining the loading of the optical trap with both isotopes of Rb was conducted and the results of that experiment are described here. The first experimental observations of spin-exchange collisions in an ultracold gas mixture of Rb are described as a part of this work. The experiments where collision-assisted Zeeman
The Realization of "Person": A Phenomenology of the "Economics" of Development.
Stanage, Sherman M.
Two very different ethical theories are involved in adult education: (1) the ethics of self-realization; and (2) the ethics of utilitarianism. The first theory presupposes that every person ought to realize and actualize the qualitatively fullest life possible for that person, whatever that person's circumstances in life. The second theory…
The Realization of "Person": A Phenomenology of the "Economics" of Development.
Stanage, Sherman M.
Two very different ethical theories are involved in adult education: (1) the ethics of self-realization; and (2) the ethics of utilitarianism. The first theory presupposes that every person ought to realize and actualize the qualitatively fullest life possible for that person, whatever that person's circumstances in life. The second theory…
New Spinor Field Realizations of the Non-Critical W3 String
ZHANG Li-Jie; LIU Yu-Xiao; REN Ji-Rong
2006-01-01
@@ We investigate the new spinor field realizations of the W3 algebra, making use of the fact that the W3 algebra can be linearized by the addition of a spin-1 current. We then use these new realizations to build the nilpotent Becchi-Rouet-Stora-Tyutin charges of the spinor non-critical W3 string.
Bootstrap inference for pre-averaged realized volatility based on non-overlapping returns
Gonçalves, Sílvia; Hounyo, Ulrich; Meddahi, Nour
The main contribution of this paper is to propose bootstrap methods for realized volatility-like estimators defined on pre-averaged returns. In particular, we focus on the pre-averaged realized volatility estimator proposed by Podolskij and Vetter (2009). This statistic can be written (up to a bi...
The role of project manager in benefits realization management as a project constraint/driver
Amr Mossalam
2016-12-01
In summary, the results of this paper can be used to: enlarging the project manager responsibilities to acquire the benefits realization, giving a high level 6-step process for benefits management, suggesting a mechanism for managing these benefits through benefits register, benefits realization plan, measures and KPIs and closure business case.
Computer Model of a "Sense of Humour". II. Realization in Neural Networks
Suslov, I M
1992-01-01
The computer realization of a "sense of humour" requires the creation of an algorithm for solving the "linguistic problem", i.e. the problem of recognizing a continuous sequence of polysemantic images. Such algorithm may be realized in the Hopfield model of a neural network after its proper modification.
Realization of GHZ States and the GHZ Test via Cavity QED
Guerra, E S
2004-01-01
In this article we discuss the realization of atomic GHZ states involving three-level atoms and we show explicitly how to use this state to perform the GHZ test in which it is possible to decide between local realism theories and quantum mechanics. The experimental realizations proposed makes use of the interaction of Rydberg atoms with a cavity prepared in a coherent state.
Realizing life-scalable experimental pyroclastic density currents
Cronin, S. J.; Lube, G.; Breard, E.; Jones, J.; Valentine, G.; Freundt, A.; Hort, M. K.; Bursik, M. I.
2013-12-01
Pyroclastic Density Currents (PDCs) - the most deadly threat from volcanoes - are extremely hot, ground-hugging currents of rock fragments and gas that descend slopes at hundreds of kilometers per hour. These hostile flows are impossible to internally measure, thus volcanologists are persistently blocked in efforts to realistically forecast their internal mechanics and hazards. Attempts to fill this gap via laboratory-scale experiments continue to prove difficult, because they usually mismatch the dynamic and kinematic scaling of real-world flows by several orders of magnitude. In a multi-institutional effort, the first large-scale pyroclastic flow generator that can synthesize repeatable hot high-energy gas-particle mixture flows in safety has been commissioned in New Zealand. The final apparatus stands 15 m high, consisting of a tower/elevator system; an instrumented hopper that can hold >6000 kg (or 3.2 m3) of natural volcanic materials, which can be discharged at a range of controlled rates onto an instrumented, variably inclinable (6-25°) glass-sided chute for examining the vertical profiles of PDCs in motion. The use of rhyolitic pyroclastic material from the 1800 AD Taupo Eruption (with its natural grain-size, sorting and shape characteristics) and gas ensures natural coupling between the solids and fluid phases. PDC analogues with runout of >15 meters and flow depths of 1.5-6 meters are created by generating variably heated falling columns of natural volcanic particles (50-1300 kg/s), dispersed and aerated to controlled particle densities between 3 and 60 vol.% at the base of the elevated hopper. The descending columns rapidly generate high-velocity flows (up to 14 m/s) once impacting on the inclined channel, reproducing many features of natural flows, including segregation into dense and dilute regimes, progressive aggradational and en masse deposition of particles and the development of high internal gas-pore-pressures during flow. The PDC starting
Analysis of a turbulent buoyant confined jet modeled using realizable k-ε model
El-Amin, Mohamed
2010-06-13
Through this paper, analyses of components of the unheated/heated turbulent confined jet are introduced and some models to describe them are developed. Turbulence realizable k-ε model is used to model the turbulence of this problem. Numerical simulations of 2D axisymmetric vertical hot water confined jet into a cylindrical tank have been done. Solutions are obtained for unsteady flow while velocity, pressure, temperature and turbulence distributions inside the water tank are analyzed. For seeking verification, an experiment was conducted for measuring of the temperature of the same system, and comparison between the measured and simulated temperature shows a good agreement. Using the simulated results, some models are developed to describe axial velocity, centerline velocity, radial velocity, dynamic pressure, mass flux, momentum flux and buoyancy flux for both unheated (non-buoyant) and heated (buoyant) jet. Finally, the dynamics of the heated jet in terms of the plume function which is a universal quantity and the source parameter are studied and therefore the maximum velocity can be predicted theoretically. © 2010 Springer-Verlag.
New approach to accuracy enhancement and traceability realization of radius of curvature measurement
Ding, Xiang; Li, Fei; Liu, Wenli
2012-10-01
High accuracy radius of curvature (ROC) measurement of optical surfaces is usually realized by techniques such as autocollimation, interferometry and profilometry, with theoretical accuracy as high as 10-6. In practical application, significant discrepancy may exist in results obtained by different methods owing to figure error of measured surfaces. In this paper, mathematical models are built up to characterize the relationship between the ROC and the figure error as well as the aperture angle. Based on the models, equations for calculating the ROC accuracy are derived and tested on several ROC measuring methods. Experiments are carried out on a set of high quality spheres whose diameters are from 11mm to 93mm and roundness is from 0.03μm to 0.07μm, measured by instruments with top level accuracy, which are a length measuring machine, a profilometer and a homemade differential confocal system. Uncertainties are calculated and analyzed against several factors. The reason for the discrepancy between different methods is explained. An approach is also proposed which could reduce the uncertainty of ROC by 1~2 scales, making it possible to trace the results of ROC measuring instruments to the primary standard of length via diameter and roundness measurement method.