levels measured for the higher magnetic field strength. In the MSFC setup, these discharge current levels were not achieved at any time. ...
NASA Website
A primary object of the present invention is to increase the magnetic field along the path of a charged particle beam so as to improve (TWT) performance. Related objects of the invention are to achieve a higher maximum peak field along the aforementioned ...
National Technical Information Service (NTIS)
Starting with the invention of the cyclotron by Lawrence, accelerator-based experiments have been the primary source of new discoveries in particle physics. In order to progress toward higher energy and luminosity, higher field magnets are required. R&D programs are underway to take advantage of new developments in ...
Energy Citations Database
Field measurements of leaf gas exchange in maize often indicate stomatal conductances higher than required to provide substomatal carbon dioxide concentrations saturating to photosynthesis. Thus maize leaves often operate at lower transpiration efficiency (TE) than potentially achievable for specie...
Technology Transfer Automated Retrieval System (TEKTRAN)
Substantial progress in plasma parameters, physics understanding, and stellarators/heliotron concept improvement has been made in the five years since a previous assessment of the field. This includes substantial achievements in higher plasma parameters a...
The productive potential of the Greek fields in wheat yield has not yet been fulfilled. On the contrary, it is possible to achieve higher yields, reaching 200 kilograms per acre now, and surpassing them at a later date. The existing potentials of the Gree...
The commonly known technology of field weakening for permanent-magnet (PM) motors is achieved by controlling the direct-axis current component through an inverter, without using mechanical variation of the air gap, a new machine approach for field weakening of PM machines by direct control of air-gap fluxes is introduced. The ...
Recent discoveries of superconducting materials that operate at high temperatures may have both technical and economic consequences for magnetic confinement fusion. In addition, they could also open up the possibility of plasma confinement by radio-frequency fields. The new, high temperature superconductors may impact the feasibility of rf confinement in two important ways: ...
If the ohmic heating solenoid for the TNS or other large tokamak is an ungraded cryostable superconducting solenoid, with NbTi at 4.2 K as the superconductor, then the smallest outer diameter is not achieved at the highest attainable field. There is a lower optimum field which minimizes the outer diameter for a given volt-second ...
DOE Information Bridge
... MATERIALS WITH HIGHER CRITICAL TEMPERATURES, HIGHER CRITICAL FIELDS AND HIGHER CURRENT CARRYING CAPACITIES. ...
DTIC Science & Technology
We obtain the characters and one- and two-point correlators for the critical Ising model on higher-genus Riemann surfaces from the factorization properties under the pinching limit of the zero- and nonzero-homology cycles. It is straightforward to obtain the {ital n}-point correlators using the above procedure and the generalization to other rational conformal ...
Nonlinear resistance of highly mobile two-dimensional electrons placed in crossed electric and strong magnetic fields attracts considerable contemporary interest. The resistance shows remarkably strong and nontrivial dependence on the electric field E in both microwave and dc responses. At small electric fields, the resistance ...
NASA Astrophysics Data System (ADS)
Experiments show that there is no difficulty about interacting with a 2/ 1 mode in ATC, and that given sufficient gain and a harmonic-free control winding the probability of stabilizing it is good. Control by steadily applied, DC quadrupole fields, on the other hand, on the basis of experiments with ATC as well as Pulsator, would seem at this juncture to have a small ...
Among the new facilities to be offered by the National Science Foundation through the National High Magnetic Field Laboratory (NHMFL) are pulsed fields that can only be achieved at a national user facility by virtue of their strength, duration, and volume. In particular, a 44 mm bore pulsed magnet giving a 60 tesla ...
A review article on superconducting magnets for accelerators should first answer the question, why superconductivity. The answer revolves around two pivotal facts: (1) fields in the range of 2 T to 10 T can be achieved; and (2) the operating cost can be less than conventional magnets. The relative importance of these two factors depends on the accelerator. ...
Superconducting properties of high-field A15 materials were studied in terms of the physical and chemical states of the A15 phases. Higher critical current is achieved through microstructural control. The A15 materials investigated include the V sub 3 Ga ...
The report summarizes density levels and corresponding variations obtained from 57 construction projects throughout the state of Texas. Almost 80 percent of the projects achieved densities higher than 92 percent based on Rice maximum theoretical specific ...
There is currently a crisis in science education in the United States. This statement is based on the National Science Foundation's report stating that the nation's students, on average, still rank near the bottom in science and math achievement internationally. This crisis is the background of the problem for this study. This investigation studied learner variables that were ...
Optical antennas have generated much interest in recent years due to their ability to focus optical energy beyond the diffraction limit, benefiting a broad range of applications such as sensitive photodetection, magnetic storage, and surface-enhanced Raman spectroscopy. To achieve the maximum field enhancement for an optical antenna, parameters such as the ...
PubMed
Performance of a Bi-2223 superconducting magnet consisted by ten double-pancake coils was improved by using iron plates (SS400) for top and bottom flanges. The magnetic field dependence of the critical current density of Bi-2223 tape for magnetic field normal to the tape was determined the maximum magnetic field of the magnet. Hence, a ...
... Title : Higher Order Geometrical Modeling and Higher Order Field/Current Modeling in FEM, MoM, and PO Simulations. ...
This paper studies the feasibility of application of a magnetic field to obtain higher aspect ratio micro holes on hardened tool steel using the micro electro-discharge machining (micro EDM) process. The magnetic field has been introduced to improve debris circulation. Implementing magnetic force perpendicular to the electrode's ...
We report theoretical calculations of the mode fields of high index lead silicate and silicon nano fibers, and show that their strong longitudinal component enables efficient excitation of surface plasmons within a silver nanorod placed at the fiber tip. An excitation efficiency 1600 times higher than that of the standard single mode fibers has been ...
A short-period hybrid-type staggered undulator is proposed. A proper combination of vanadium Permendur (VP) pole and NdFeB magnet provide approximately 40% larger peak field strength than a conventional staggered undulator. The peak field of a 15-mm-period hybrid staggered undulator exceeds 0.8 T at a gap of 6 mm. Also, by using dysprosium as a pole and ...
A combined function superferric magnet option has been investigated for the Relativistic Heavy Ion Collider (RHIC). The option requires the maximum value of the field in the magnet to be much higher than that achieved in any existing combined function accelerator magnet. A model is presented here in which a good ...
On the basis of a phenomenological model of the anisotropic ferrimagnet, the analysis of the critical behavior of ferrimagnetic RE-TM compounds in dependence on the applied field and temperature has been carried out. The model has been applied to some RE2TM17 intermetallic compounds, in which the presence of the intermediate saturation has been experimentally verified by ...
We show the theoretical depairing current limit can be achieved in a robust fashion in highly ordered superconductor nanomesh films having spatial periodicities smaller than both the superconducting coherence length and the magnetic penetration depth. For a niobium nanomesh film with 34 nm spatial periodicity, the experimental critical current density is enhanced by more than ...
One of the major factors limiting levitation force for existing superconducting magnetic bearings is the maximum possible remanence of 1.4 T known to exist for rare-earth permanent magnets. This paper introduces the novel concept of a magnetic bearing which uses the difference in irreversibility field of two superconducting components to allow one component to be ...
The Department of Education in the United Kingdom established ambitious targets for achievement in the three core areas of English, maths and science measured by national curriculum testing. Annual results of the assessment for 2005 indicate that the government is some way off achieving these targets, currently 85%, for the academic years 2006-2008, but ...
ERIC Educational Resources Information Center
... the circular pipeline will achieve a speedup of 55 times, vice three times. ... circular pipelines were presented and analyzed. ...
... to significantly improve the throughput achieved in the search for bent ... a high throughput (one function per clock) approach to searching for bent ...
... various government, nongovernment, and academic sources to ... Activities to Achieve Desired Effects in the ... can feed into the achievement of higher ...
Magnetic resonance imaging (MRI) in very low fields isfundamentally limited by untruncated concomitant gradients which causesevere distortions in image acquisition and volume selection if thegradient fields are strong compared to the static field. In this paper,it is shown that gradient fields oscillating in ...
Energy spread is an important parameter of an electron linac and, usually, is determined by the time dependence of the external rf accelerating field. By using a combination of fundamental and higher harmonic frequencies, the accelerating field can be maintained approximately constant over a beam bunch with the resultant energy spread ...
A higher trapped field BT{}P and larger total trapped flux ?T have been achieved on a SmBaCuO bulk superconductor (? 45 mm) by a modified multipulse technique with stepwise cooling (MMPSC) and a subsequent iterative magnetizing operation with gradually reduced pulse field amplitude (IMRA). BT{}P=4.33 T has been ...
... Accession Number : ADA385405. Title : Achieving the Texas Higher Education Vision. Corporate Author : RAND CORP SANTA MONICA CA. ...
The use of aplanatic solid immersion lenses (ASILs) made of high-refractive-index optical materials provides a route to wide-field high-resolution optical microscopy. Structured illumination microscopy (SIM) can double the spatial bandwidth of a microscope to also achieve high-resolution imaging. We investigate the combination of ASILs and SIM in ...
A method to achieve NMR of dilute samples in the earth's magnetic field by applying para-hydrogen induced polarization is presented. Maximum achievable polarization enhancements were calculated by numerically simulating the experiment and compared to the experimental results and to the thermal equilibrium in the earth's magnetic ...
In order to achieve higher luminosities in Run II a separate antiproton storage ring was built in the Main Injector tunnel. To reduce both construction and operations costs permanent magnets were used. This paper discusses the design criterion and specifications, including temperature dependence, longitudinal uniformity, and adjusting of the ...
Loss mechanisms affecting the performance of an MHD seawater thruster system have ben identified and discussed. Among those losses are the jet and nozzle losses, joule heating losses, surface potential and electro-chemical losses, frictional losses, and electrical end losses. Simple, but accurate, models have seen used to assess the relative and absolute magnitude of these losses and to ...
By the year 2000, European higher education institutions must achieve the following aims: resolve the conflict between the social demand for education and costs of higher education without lowering standards; provide continuing education to cope with rapid technological change and increased leisure and/or unemployment; build even ...
Under the Power Plant Improvement Initiative Program funded by the U.S. Department of Energy, a full-scale Advanced Hybrid{trademark} filter was installed at the Big Stone Plant, with start-up in October 2002. The Advanced Hybrid{trademark} filter was retrofitted into Fields 2-4 of the old Big Stone electrostatic precipitator (ESP). While many aspects of the operation were ...
An agenda to make historical analysis an integral part of public policy analysis in higher education is outlined. It is argued that the history of higher education should have a prominant place within higher education as a field of research, planning, development, and administration. Rather than claiming that a ...
The general thermophotovoltaic (TPV) system can get high efficiency, by adding a spectral filter or using a selective thermal emitter, but the output power density is very low. However, the microgap TPV system can get high output power density, but the efficiency is relatively low, due to the difficulty of cropping the emissive spectrum of the thermal emitter in the near ...
Schoolwork, especially lessons in manual skills is often associated with various ergonomics stresses. These stresses are the result not only of school obligations but also of the physical working environment and inadequate lesson planning. Much can be done in this field if certain approaches are taken into consideration at the work planning stage. Thus we can use certain ...
We study the Q2 evolution of the form factors (FFs) for the nucleon-to-N*(1680) transition in the framework of effective field theory. To this end, the intrinsic symmetries of the spin-(5)/(2) Rarita-Schwinger (RS) fields are analyzed, and a Lagrangian of the electromagnetic NN*(1680) interactions is constructed. The Lagrangian preserves all the intrinsic ...
'In this research program, Oak Ridge National Laboratory is investigating the modification of phase equilibria and interface transport enhancement-caused by electric fields. The majority of environmental and waste treatment processes involve complex chemical separations and reactions. The treatment efficiency in such processes is governed by thermodynamic equilibria ...
The epitaxial growth of magnetoresistive La2/3Sr1/3MnO3 thin films with different orientations on (001) Si substrates has been successfully achieved by a suitable choice of the buffer heterostructure. The out-of-plane and in-plane microstructure has been carefully analysed and related to the magnetocrystalline anisotropy. The dependence of the magnetoresistance (MR) as a ...
... of this project was to develop numerical integration algorithms that ... System (NOGAPS) to achieve higher horizontal and vertical resolution, higher ...
higher relative humidity, water balance can be achieved at higher temperatures. CONDENSER. A condenser capable of cooling the 60?C exhaust stream of the ...
The production of advanced microchips by x-ray lithography seems likely to become the first large-scale industrial application of synchrotron radiation. Of all the possible x-ray sources, only storage rings have sufficent power to achieve economic throughputs. For this reason, many rings have been and are being built worldwide for lithography. Superconducting rings are ...
The current Japanese water system uses drinkable water just for transporting pollutants such as flus from. This system must become part of their daily lives by penetrating in their lifestyle so that such technologies, scholars) both in Japan and the local community. The role of higher education such as Japanese universities
E-print Network
As the Jefferson Laboratory upgrades the existing CEBAF electron accelerator to operate at higher energies, the fundamental power coupler windows will be required to operate with lower RF dissipation and increased immunity to radiation from cavity field emission. New designs and modifications to existing designs which can achieve these ...
Lasing at short wavelengths with an accelerator of modest energy can only be achieved with a wiggler of short period and high field operating, perhaps, at a high harmonic of the fundamental frequency. We discuss the characteristics of wigglers of this kind, designed to lase with harmonic numbers as large as fifty or so, emphasizing their gain, efficiency, ...
CONTROLLERS FOR STANDARD AND PARALLEL ROBOTS P. P�isa O. Vysok�y Department of Control engineering: There are discussed results of development of motion controllers and control algorithms for robots with standard and parallel kinematics. Reason for parallel robot kinematics research is promise to achieve higher stiffness
The economic feasibility of applying hybrid gas reburn to glass tanks to achieve higher NOx emission reduction has been shown in this phase of the work. A field demonstration of one of these hybrid concepts should be pursued. The cooperation and input fro...
Recently carbon-dioxide laser excited by microwave discharge has been studied to achieve higher efficiency and lower cost laser system. In this study a stripline was used to guide microwave with TEM mode. This mode has almost homogeneous intensity distribution of electric field and almost homogeneous discharge could be obtained.
Insulating single-crystal SrTiO3 wafers have been rendered conductive below room temperature by subjecting them to electric fields. With moderate fields the process can be reversed by warming the substrates to room temperature or slightly above. At higher fields the process is not reversible. When substrates ...
The satellite mission GOCE provides a fundamental contribution in the field of high accurate determination of the stationary gravity field. Combination of GOCE with GRACE data - this is done for example in the GOCO project (�Combination of GOCE data with complementary gravity field information�) - leads to a gravity ...
The design method for a high power, X-band, 50 dB, circular to rectangular directional coupler is presented. The circular guide is over moded and is intended to operate in TE{sub 01} mode. The rectangular guide operates at the fundamental TE{sub 10} mode. A small percentage of higher order modes in the circular guide can cause considerable errors in the measurements because ...
We report the observation of a higher-order frequency shift due to the trapping field in a {sup 87}Sr optical lattice clock. We show that, at the magic wavelength of the lattice, where the first-order term cancels, the higher-order shift will not constitute a limitation to the fractional accuracy of the clock at a level of 10{sup -18}. ...
Experimental results and simulations of Charge Collection Efficiency (CCE) of Current Injected Detectors (CIDs) are focused. CID is a concept where the current is limited by the space charge. The injected carriers will be trapped by the deep levels. This induces a stable electric field through the entire bulk regardless of the irradiation fluence the detector has been exposed. ...
In the spectral region where the refractive index of the negative index material is approximately zero, at oblique incidence, the linear transmission of a finite structure composed of alternating layers of negative and positive index materials manifests the formation of a new type of band gap with exceptionally narrow band-edge resonances. In particular, for TM-polarized (transverse magnetic) ...
We demonstrate a vertical-field-driven polymer-stabilized blue phase liquid crystal (PS-BPLC) mode for solving low transmittance and high driving voltage problems in conventional in-plane-switching (IPS) PS-BPLC modes. By controlling the ray directions of incident beams by means of two prism sheets attached to the top and bottom substrates, continuous grayscale properties can ...
In the last few years superconducting radio-frequency (rf) cavities made of high-purity (residualresistivityratio>200) niobium achieved accelerating gradients close to the theoretical limits. An obstacle towards achieving reproducibly higher fields is represented by �anomalous� losses causing a sharp ...
In order to achieve higher areal density, magnetization transition width must be reduced. This requires small media switching field distribution (SFD). Here we explore SFD and transition width in heat assisted magnetic recording and microwave assisted magnetic recording. We reveal that for energy assisted magnetic recording, additional ...
An audio-frequency power supply for the filament of an ionization gage is described. The frequency chosen is higher than the natural frequency of oscillation of the filament, hence the gage may be used in a magnetic field. Stabilization is achieved by comparing the potential at one end of a high- stability resistance through ...
Abstract: "Engineering employers agree that a good understanding of engineering science fundamentals, e.g. mathematics, and a good understanding of verbal and written communication, are among the attributes held by successful engineers. Observations confirm that males, particularly at higher levels, excel over females in mathematics performance, but not written performance. ...
NSDL National Science Digital Library
The policies and practices of the nation's colleges and universities constitute the means for achieving the aims of higher education. This report provides the results of a survey of the policies and practices of institutions of higher education. These pol...
... ACOUSTIC TESTING OF STRUCTURES AT ELEVATED TEMPERATURES IS DISCUSSED, INCLUDING TECHNIQUES FOR ACHIEVING HIGHER ...
