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The advancement of linear mode photoconductive semiconductor devices provides increased timing control capabilities for arrayed antenna systems, especially those requiring high power. The temporal response of the switch is dependent upon photonic energy and therefore is capable of yielding specific frequency content per excitation. The versatility with respect to frequency content provides differing...
A user who wants to use a service forbidden by their site’s usage policy can masquerade their packets in order to evade detection. One masquerade technique sends prohibited traffic on TCP ports commonly used by permitted services, such as port 80. Users who hide their traffic in this way pose a special challenge, since filtering by port number risks interfering with legitimate services using the same...
This chapter outlines some of the basic ideas behind nonresonant and resonant X-ray scattering, using classical or semiclassical pictures wherever possible; specifically, we highlight symmetry arguments governing the observation of X-ray optical effects, such as X-ray magnetic circular dichroism and resonant “forbidden” diffraction. Without dwelling on the microscopic physics that underlies resonant...
In white clover (Trifolium repens L.) plant persistence, overwintering and grazing tolerance are to a significant extent determined by the presence of a dense network of horizontal stems or stolons. At IGER, we have developed new linkage maps of white clover specifically to facilitate the identification of quantitative trait loci (QTLs) for important components of stolon morphology. The parents of...
An electrically biaxial anisotropic sample design methodology utilizing crystal-lographic symmetry is discussed. Sample synthesis equations based on equivalent capacitance analysis translate desired permittivity values and host materials to sample cell dimensions and are subsequently fabricated on a 3-D printer. Equivalent capacitance predictions yield permittivity tensor element values comparable...
This work presents a novel modeling and analysis framework for graph sequences which addresses the challenge of detecting and contextualizing anomalies in labeled, streaming graph data. We introduce a generalization of the BTER model of Seshadhri et al. by adding flexibility to community structure, and use this model to perform multi-scale graph anomaly detection. Specifically, probability models...
UTC Aerospace Systems (UTAS) has developed a family of high performance open loop accelerometers, which, branded under the name "Gemini", aim to meet the needs of aerospace and commercial applications. There are five different acceleration ranges in the family: 0.85g, 2g, 10g, 30g and 96g. The sensor is manufactured and marketed by Silicon Sensing Systems Limited (SSSL). It comprises a silicon...
This study consisted of a qualitative and quantitative evaluation of fire detection and suppression capabilities in a facility by the standard operating crew. This evaluation was made using Human Reliability Analysis (HRA) quantification techniques, which resulted in a set of human error probabilities (HEPs) characterizing the detection and suppression actions. The HEPs were input to a comprehensive...
A numerical method for rigorous over-approximation of a solution set of an input-affine system whose inputs represent some bounded noise is presented. The method gives high order error for a single time step and a uniform bound on the error over the finite time interval. The approach is based on the approximations of inputs by linear functions at each time step. We derive the single-step error in...
Both THz-TDS and NMR techniques were employed to study the hydrogen bonding networks formed in 2-propanol/water mixtures. The composition of such solvent mixtures is shown to significantly impact on the mobility of the solute molecules.
In this paper, we develop a theory of computable types suitable for the study of control systems. The theory uses type-two effectivity as the underlying computational model, but we quickly develop a type system which can be manipulated abstractly, but for which all allowable operations are guaranteed to be computable. We apply the theory to the study of hybrid systems, reachability analysis, and control...
In this article we report on the use micro-focus synchrotron X-ray radiation and pion beams to compare the detection efficiencies and charge sharing properties of novel 3D detectors to that of the current planar technology. Detector substrates are bump-bonded to the Medipx2 and Timepix chips. 55??m square pixel maps of the detection efficiencies have been produced using X-ray and MIP beams. For X-rays,...
The paper discusses the potential advantages of operating a microwave power-generating solar power satellite demonstrator in low equatorial orbit. Advantages include being able to deliver power to receiving antennas in a dozen countries around the equator many times/day, and enabling progressive growth to become a large scale system, including geo-stationary satellites. Solar power satellites operating...
Microstrip antennas have been shown to radiate when the dominant or fundamental mode is suppressed and the first higher order mode is excited. One such microstrip variation is the Thiele Half-Width (THW) antenna, which operates from 5.9 - 8.2 GHz in this paper. Increasing the bandwidth over which the THW antenna operates is desired, as is an increase in the leakage constant, a, over this region. A...
The software package ConPAHS facilitates control design of continuous-time piecewise-affine hybrid systems on polytopes. For the control objective of reaching a particular state from a specified initial state, the output of the package is a piecewise-affine control law. After a short review of the control theory for this problem, the paper presents the functional specification of ConPAHS, the objected...
This paper reports on the capability of rapid time/frequency transfer, surveying the transatlantic link between timing laboratories of the U.S. Naval Observatory (USNO, Washington D.C., USA) and the Istituto Nazionale di Ricerca Metrologica (I.N.RI.M., Torino, Italy). Over a six month period, the near-real-time estimation of the UTC(USNO) to UTC(IEN) offset computed by Natural Resources Canada (NRCan)...
This paper presents a preliminary assessment of the quality of station clock states, estimated in "near-real-time" by the process running at Natural Resources Canada (NRCan). The evaluation is mainly of the short and long-term frequency stability and the accuracy thereof with respect to the IGS rapid and final clock products, provided by the International GNSS Service (IGS). The aim of this...
The IEEE 1149.1 boundary-scan standard has become an increasingly important architecture for overcoming many of the testability issues facing today's complex high density designs. However, it is becoming increasingly difficult in modern systems to gain access to the inherent board level boundary-scan infrastructure through the edge connector. Subsequently it has become imperative that an alternative...
The objective of this panel is to take the ever growing topic of system-on-chip (SoC) technology and bring it into the real world by asking the question: "How are we actually going to test these SoC's on a board?"
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