Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"fixed target"”.
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An item response theory-based statistical procedure for detecting concurrent internal bias in ability tests
… an ability intended to be measured by the test (target ability) and nuisance determinant abilities. If the nuisance ability distributions conditional on a fixed target ability are different across group, and contamination of several items with these nuisance abilities is present in their item …
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Modified 3+3 Design for MTD Re-estimation
… a maximum of six patients per dose level and fixed target toxicity rates. To address these issues, we propose a modified 3+3 design that extends the traditional 3+3 design by treating the remaining patients at the MTD level for additional dose-limiting toxicity (DLT) assessment. This …
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Further evidence and understanding for the contrast signal theory of parallel processing in visual search
… that, to the contrary, parallel processing in fixed-target search tasks produce systematic, logarithmic RT variations depending on set size and target-distractor similarity. The Contrast Signal Theory (CST) of visual search was proposed to account for these variations and elucidate the …
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Measurement of inclusive Lambda / Antilambda hyperon polarisation in proton nucleus collisions at 920 GeV proton beam energy
… proton beam of 920 GeV energy to collide with fixed target wires of different materials. A sample of approximately 2900 Lambdas was obtained in a kinematical region of transverse momentum p_t in [0.2,2.2] GeV/c and Feynman variable x_F in [-0.19,0.03] and roughly 1350 Antilambdas were found in …
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Measurement of the D*+- cross-section at HERMES
… electroproduction of D^{*+/-} mesons on a proton target has been measured in a fixed target experiment with a lepton beam energy of 27.5 GeV. The analysis is based on data collected by HERMES in 1997. From this result, the open charm photoproduction cross-section is determined for a photon energy …
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Boost through reentry trajectory planning for maneuvering reentry vehicles
… trajectory can be flown to a fixed target, contains valuable information about the joint capabilities of the booster and the reentry vehicle. At each piercepoint in the Aimpoint Map, a set of velocities and flight path angles exist that can be reached from launch as well as a …
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First measurement of the gluon polarisation in the nucleon using D mesons at COMPASS
… measurements are so far exclusively performed by fixed-target experiments. <br>The limited knowledge of the structure functions aggravates the difficulty that <br>the gluon distribution enters only in next-to-leading order and is thus <br>suppressed by the strong coupling constant. <br>A direct …
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Hyperon Production in Proton-Nucleus Collisions at 42 GeV Center of Mass Energy
… been taken with a minimum bias trigger at the fixed target experiment HERA-B, which uses the 920 GeV proton beam of the HERA storage ring at DESY. $\Lambda$, $\Xi$ and $\Omega$ hyperons produced in collisions using carbon and tungsten wires as targets were reconstructed. Hyperon ratios are …
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Measurement of the Deeply Virtual Compton Scattering Cross Section from the Proton at 10.6 GeV using the CLAS12 Detector
… be probed and three-dimensional images of the target nucleon or nucleus can be realized. This thesis presents a cross section analysis of DVCS from the proton in the presence of its background, Bethe-Heitler (BH) process. The CEBAF Large Acceptance Spectrometer for operation at 12 GeV beam …
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PROOF-OF-PRINCIPLE TEST FOR AN EXPERIMENT FOR SHORT-LIVED PARTICLE DIPOLE MOMENTS AT LHC
… motivations and preparatory work for a proposed fixed-target programme at the LHC aimed at performing the first direct measurements of charm baryon dipole moments. Central to this effort is the ALADDIN concept, which exploits bent-crystal channelling to produce forward charm baryons and measure …
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Systematic variability in stage-one processing as revealed by eye movements in efficient visual search
… times. In an efficient search task with a fixed target, reaction times were observed to increase logarithmically with set size. In addition, this logarithmic increase was modulated by the visual similarity between the target and the lures. We thus proposed a new model of visual search: …
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The effects of random linear target direction in a computerized Dynamic Visual Acuity task
… (DVA) to date has conventionally used visual targets originating from a single fixation point and moving in a single, predictable linear direction. These procedures (presumably dictated by apparatus constraints) ensured the observer knew when and from where the target would appear. A …
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A measurement of the x dependent sea flavor asymmetry at Seaquest
SeaQuest is a fixed target forward spectrometer experiment located at Fermilab which uses a 120 GeV proton beam on liquid hydrogen, liquid deuterium, and several solid targets. The flagship measurement of this experiment is to use the Drell-Yan process to improve the accuracy of the antiquark PDFs …
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Hybrid organic-inorganic nanomaterials for applications at the biointerfaces
… in order to modulate their responses to the fixed target. A fine development of such smart nanosystems could occur only by a critical control of chemical/physical properties of NMs at the biological interfaces. According to such premises, this thesis deals with the investigation of NMs at the …
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Text orienting cues: Enhancing dynamic visual acuity for targets of unknown origin
… ability to resolve a critical detail in a visual target under conditions of relative motion between an observer and a target. DVA research has conventionally used visual targets originating from a single fixation point and moving in a predictable linear path. These procedures (dictated by …
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Spatially Coupled Sparse Regression Codes for Single- and Multi-user Communications
… users grows linearly with the code length. For a fixed target error rate and message size per user (in bits), we obtain the exact trade-off between energy-per-bit and the user density achievable in the large system limit. We show that a coding scheme based on spatially coupled Gaussian matrices …
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Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment at Fermilab
… liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\bar{d}/\bar{u}$ ratio up to $x\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan …
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Constraints on New Physics from Various Neutrino Experiments
… we consider the NuSOnG experiment, which is a fixed target neutrino scattering experiment proposed at Fermilab, and a hypothetical long-baseline neutrino oscillation experiment in which the Fermilab NUMI beam is aimed at the Hyper-Kamiokande detector in Japan. In addition to the sensitivity to …
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Path planning for image based visual servoing
… system can be positioned with respect to a 3D fixed target by minimizing the differences between its initial view and its goal view, corresponding respectively to the initial and the goal system configurations: the robot Cartesian Motion is thus generated only by means of visual informations. …
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Measurement of high-mass dimuon production for p+p and p+d collisions with 120 GeV proton beam at Fermilab
SeaQuest is a fixed-target experiment at Fermilab using 120 GeV proton beam from the Main Injector. High-mass muon pairs from the interaction of proton beam with various liquid and solid targets were detected in a newly constructed spectrometer. The primary goal of the experiment is to study the …
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