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Literatura académica sobre el tema "Spiral array"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Spiral array"

de Souza, Júlio Cesar Eduardo, Montserrat Parrilla Romero, Ricardo Tokio Higuti y Óscar Martínez-Graullera. "Design of Ultrasonic Synthetic Aperture Imaging Systems Based on a Non-Grid 2D Sparse Array". Sensors 21, n.º 23 (30 de noviembre de 2021): 8001. http://dx.doi.org/10.3390/s21238001.

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This work provides a guide to design ultrasonic synthetic aperture systems for non-grid two-dimensional sparse arrays such as spirals or annular segmented arrays. It presents an algorithm that identifies which elements have a more significant impact on the beampattern characteristics and uses this information to reduce the number of signals, the number of emitters and the number of parallel receiver channels involved in the beamforming process. Consequently, we can optimise the 3D synthetic aperture ultrasonic imaging system for a specific sparse array, reducing the computational cost, the hardware requirements and the system complexity. Simulations using a Fermat spiral array and experimental data based on an annular segmented array with 64 elements are used to assess this algorithm.

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Engebretson, Mark E. y Luis F. Esparza. "Spiral line array loudspeaker". Journal of the Acoustical Society of America 127, n.º 5 (2010): 3286. http://dx.doi.org/10.1121/1.3432269.

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Yoon, Hansol y Tai-Kyong Song. "Sparse Rectangular and Spiral Array Designs for 3D Medical Ultrasound Imaging". Sensors 20, n.º 1 (27 de diciembre de 2019): 173. http://dx.doi.org/10.3390/s20010173.

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In three-dimensional (3D) medical ultrasound imaging with two-dimensional (2D) arrays, sparse 2D arrays have been studied to reduce the number of active channels. Among them, sparse 2D arrays with regular or uniform arrangements of elements have advantages of low side lobe energy and uniform field responses over the entire field of view. This paper presents two uniform sparse array models: sparse rectangular arrays (SRAs) on a rectangular grid and sparse spiral arrays (SSAs) on a sunflower grid. Both arrays can be easily implemented on the commercially available or the custom-made arrays. To suppress the overall grating lobe levels, the transmit (Tx) and receive (Rx) array pairs of both the array models are designed not to have grating lobes at the same locations in the Tx/Rx beam patterns, for which the theoretical design rules are also proposed. Computer simulation results indicate that the proposed array pairs for both the SRAs and the SSAs achieve peak grating lobe levels below –40 dB using about a quarter of the number of elements in the dense rectangular array while maintaining similar beam widths to that of the dense array pair.

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Hebib, S., N. Raveu y H. Aubert. "Cantor Spiral Array for the Design of Thinned Arrays". IEEE Antennas and Wireless Propagation Letters 5 (2006): 104–6. http://dx.doi.org/10.1109/lawp.2006.872415.

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Yunlin Liu, Yong Wang y Rugui Yang. "A cylindrical spiral patch array". IEEE Transactions on Antennas and Propagation 49, n.º 2 (2001): 196–99. http://dx.doi.org/10.1109/8.914275.

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RECIOUI, Abdelmadjid. "Concentric Ring Arrays Optimization Using the Spiral Inspired Technique". Algerian Journal of Signals and Systems 3, n.º 1 (15 de marzo de 2018): 10–21. http://dx.doi.org/10.51485/ajss.v3i1.55.

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In this work, concentric ring Arrays (CRA) with non-uniform excitation are investigated, with the objective being to minimize the Sidelobe Level (SLL) for the array and keep the Directivity within an acceptable value. The optimization technique to be used to reach this objective is the spiral inspired optimization technique.. First, the technique is used to minimize the SLL only. Next the array factor is optimized for Directivity only. Then, the excitation is varied for both SLL and Directivity to be optimized. The results show significant improvements with respect to the uniform case, especially for SLL reduction, with different levels of success depending on the employed optimization technique, fitness function, varied parameters, and array size.

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Radó, János, Péter Udvardi, Saeedeh Soleimani, Lucky Kenda Peter, István Bársony, Péter Révész y János Volk. "Low-Frequency Piezoelectric Accelerometer Array for Fully Implantable Cochlear Implants". Proceedings 2, n.º 13 (26 de noviembre de 2018): 1059. http://dx.doi.org/10.3390/proceedings2131059.

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We demonstrate a low-volume, stress-free, piezoelectric micro-electromechanical system (MEMS) cantilever array for fully implantable hearing aids. The 12-element spiral-matrix is sensitive to the lower part of audible frequency range (300–700 Hz) through the proper resonant frequency of the individual spirals tuned by dimensions of the cantilevers. The obtained high Q-factors (117–254) provide high frequency selectivity. The generated open circuit voltage signals could be sufficient for the direct analog conversion of the signals for cochlear multielectrode implants. By comparing different geometries we have also demonstrated that the initial stress, which is derived from silicon-dioxide (SiO2) and aluminum-nitride (AlN) layers, could be drastically reduced simply by the spiral geometry. The results of vibration measurements have shown a good agreement with the calculated resonant frequencies.

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Fukuoka, Junya, Matthias D. Hofer, Takashi Hori, Tomonori Tanaka, Shin Ishizawa, Kazuhiro Nomoto, Manami Saito, Takeshi Uemura y Lucian R. Chirieac. "Spiral Array: A New High-Throughput Technology Covers Tissue Heterogeneity". Archives of Pathology & Laboratory Medicine 136, n.º 11 (1 de noviembre de 2012): 1377–84. http://dx.doi.org/10.5858/arpa.2011-0393-oa.

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Context.—Tissue array is a well-established technique that connects basic research with clinical applications and allows for the validation of many pathobiologic events from gene expression dysregulation to genomic aberrations. However, conventional tissue array has several limitations such as poor representation of tissue heterogeneity, destruction of donor tissue blocks due to coring, and usage of particular specimens that have limited evaluable material (tissue from thin specimens or needle biopsies). Objective.—To show the noninferiority and superiority of the new technique named Spiral Array—which allows for improved representation of the donor tissue while keeping the architectural details of the donor block intact—to that of the conventional tissue array. We compared the morphologic features of both methods. Design.—We created both Spiral Array and conventional tissue array for 25 lung adenocarcinomas and 50 multiple tumors of various organs. The degree of coverage of tissue heterogeneity was examined by observing the range of the staining intensity differences in immunohistochemistry, using cytokeratin 7 and epidermal growth factor receptor (EGFR); the degree of morphologic preservation was tested by level of accurate prediction among 3 pathologists of the histopathologic diagnosis and organ type. Results.—The Spiral Array showed better representations of the range of staining intensity for EGFR (P = .01). The level of accuracy for predicting organ type was significantly higher in Spiral Array than conventional tissue array (P = .047), whereas it was not significantly different between the 2 techniques for the histologic diagnosis. Conclusion.—Our data indicate that Spiral Array has benefits for covering tissue heterogeneity and preserving better morphology.

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Martínez, O., C. J. Martín, G. Godoy y L. G. Ullate. "2D array based on fermat spiral". Physics Procedia 3, n.º 1 (enero de 2010): 399–406. http://dx.doi.org/10.1016/j.phpro.2010.01.052.

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Liu, Z. Q. y Mian Hao Zhang. "Based on Pro/E Construction Method of Spiral Bevel Gear Logarithm". Advanced Materials Research 215 (marzo de 2011): 167–71. http://dx.doi.org/10.4028/www.scientific.net/amr.215.167.

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For a new type of bevel gear named as logarithmic spiral bevel gear, establish its tooth direction curves and the mathematical model of tooth surface equation. With CAD software platform which can intuitive understanding of complex curves and combined with conical logarithmic spiral parameter equation build the logarithmic spiral on cone surface. Then array logarithmic spiral to make them evenly distributed in the cone surface, without any interference and to meet the strength distribution on both ends of circular truncated cone equally. Use two logarithmic spirals from different starpoint as tooth direction curves of lift and right tooth surface. Finally, use space geometric knowledge to build tooth surface equation by tooth direction curves and tooth profile curves.

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Tesis sobre el tema "Spiral array"

Tweedie, Andrew. "Spiral 2D array designs for volumetric imaging". Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23167.

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The use of linear phased arrays in NDE inspections has recently grown, resulting in faster inspection of components. Phased arrays are also used in underwater sonar and biomedical imaging. All applications require 2 dimensional (2D) arrays, capable of volumetric imaging, to further increase scan speed, and to allow tighter focussing on targets. However, 2D arrays have not found widespread use, mainly due to the large number of elements required to implement standard periodic designs. Alternative array configurations that feature a much lower element count offer a more pragmatic solution. This thesis investigates the design of sparse 2D arrays (i.e. using fewer elements than a periodic grid sampled at the Nyquist rate) based on geometric spiral structures, with the aim to reduce the number of array elements, and therefore transmit-receive channels required to meet a given acoustic specification. The aperiodic structure of these array designs is shown to minimise the height of sidelobes, by spatially distributing sidelobe energy, therefore avoiding artefacts in the resulting acoustic image. Furthermore, their mathematically determined position simplifies the layout of the array, and therefore its manufacture. The approach taken was to develop a logarithmic spiral structure, which is shown to minimise peak sidelobe height for a given number of array elements. A series of design rules was created, to allow the array designer to rapidly create sparse array designs to meet an acoustic specification. The acoustic field created by these designs was modelled, and it was shown that they have lower peak sidelobe levels than equivalent random 2D array designs. A 1.5 MHz, 127 element prototype array was then designed and manufactured for NDE inspection on thick section welds, which combined a -31 dB sidelobe floor with the capability for volumetric steering.

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Zhang, Piyou. "Slotted Spiral Antennas and Widebandwidth Array Systems". University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1222311888.

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Jiwani, Aziz Mohamed Husein. "Conical spiral antennas for the Square Kilometre Array - a feasibility study". Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/200.

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The Square Kilometre Array is a next-generation radio telescope originally slated to operate at 70 – 450 MHz frequency in its lowest band (SKA-low). This thesis examines aspects of SKA-low station design and finds that two-stage beamforming produces acceptable performance. Additionally, single- and dual-polarised conical spirals are evaluated as candidate SKA-low elements. Though neither versions are strong candidates for SKA, the single-polarised spiral is an excellent antenna for use in Global Epoch of Reionisation experiments.

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Hinostroza, Israel. "Design of wideband arrays of spiral antennas". Phd thesis, Supélec, 2013. http://tel.archives-ouvertes.fr/tel-00830469.

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This work focuses on the design of wideband dual polarized arrays using spiral antennas. These antennas are known for having wideband properties. But, due to the presence of the grating lobes, the bandwidth is decreased when using an array instead of a single antenna. In order to obtain a dual polarized array, it is needed to use elements of opposite polarization, which creates great distances between same polarization elements, meaning an earlier presence of the grating lobes. In this work, an analytic method was developed to estimate the bandwidth of the spiral arrays. This method showed that the maximum bandwidth of uniform spiral arrays is about an octave, for the mono-polarized case, and nonexistent for the dual polarized case. Working on the validation of the method, some resonances were observed. Explanations are presented, as well as possible solutions. Trying to expand the bandwidth of the array, it was found that it is possible and suitable to use at the same time the two current design paradigms for wideband arrays. Using this idea, a 6:1 bandwidth concentric rings array using connected spirals was achieved. Perspectives are also presented.

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Wu, Ya-Lin, Kazushi Sakamoto y Hsi-An Pan. "Submillimeter Array 12CO (2-1) Imaging of the NGC 6946 Giant Molecular Clouds". IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623951.

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We present a (CO)-C-12 (2-1) mosaic map of the spiral galaxy NGC 6946 by combining data from the Submillimeter Array and the IRAM 30m telescope. We identify 390 giant molecular clouds (GMCs) from the nucleus to 4.5 kpc in the disk. GMCs in the inner 1 kpc are generally more luminous and turbulent, some of which have luminosities > 10(6)K. km. s(-1) pc(2) and velocity dispersions > 10. km s(-1). Large-scale bar-driven dynamics likely regulate GMC properties in the nuclear region. Similar to the MilkyWay and other disk galaxies, GMC mass function of NGC 6946 has a shallower slope (index > -2) in the inner region, and a steeper slope (index < -2) in the outer region. This difference in mass spectra may be indicative of different cloud formation pathways: gravitational instabilities might play a major role in the nuclear region, while cloud coalescence might be dominant in the outer disk. Finally, the NGC 6946 clouds are similar to those inM33 in terms of statistical properties, but they are generally less luminous and turbulent than the M51 clouds.

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Caswell, Eric D. "Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes". Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/25963.

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This dissertation details the development of the star spiral antenna and demonstrates the advantages of the star spiral when used in a wideband array with variable element sizes. The wideband array with variable element sizes (WAVES) is a multi-octave array that uses different sized circular Archimedean spirals for each octave of frequency coverage. A two-octave WAVES array has been presented in the literature, but a gap in the two-octave frequency coverage exists along the principal axes. The star spiral antenna was developed to eliminate the performance gap in the WAVES array. The star spiral is a type of slow-wave spiral that also offers array-packing advantages, particularly for the WAVES array. The size reduction that can be achieved with the star spiral is comparable to that of the square spiral, but the star spiral is much more efficient in terms of its expected size reduction compared to its circumference. The far-field patterns, gain, and scan performance of the star spiral are similar to that of the circular Archimedean spiral. The use of the star spiral to eliminate the performance gap in a WAVES array of circular Archimedean spirals is detailed. Furthermore, a three-octave WAVES array of star spirals is built and measured, and the scan performance of the array is investigated via simulation.
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Asif, Rameez. "Design and Implementation of System Components for Radio Frequency Based Asset Tracking Devices to Enhance Location Based Services. Study of angle of arrival techniques, effects of mutual coupling, design of an angle of arrival algorithm, design of a novel miniature reconfigurable antenna optimised for wireless communication systems". Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/17143.

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The angle of arrival estimation of multiple sources plays a vital role in the field of array signal processing as MIMO systems can be employed at both the transmitter and the receiver end and the system capacity, reliability and throughput can be significantly increased by using array signal processing. Almost all applications require accurate direction of arrival (DOA) estimation to localize the sources of the signals. Another important parameter of localization systems is the array geometry and sensor design which can be application specific and is used to estimate the DOA. In this work, various array geometries and arrival estimation algorithms are studied and then a new scheme for multiple source estimation is proposed and evaluated based on the performance of subspace and non-subspace decomposition methods. The proposed scheme has shown to outperform the conventional Multiple Signal Classification (MUSIC) estimation and Bartlett estimation techniques. The new scheme has a better performance advantage at low and high signal to noise ratio values (SNRs). The research work also studies different array geometries for both single and multiple incident sources and proposes a geometry which is cost effective and efficient for 3, 4, and 5 antenna array elements. This research also considers the shape of the ground plane and its effects on the angle of arrival estimation and in addition it shows how the mutual couplings between the elements effect the overall estimation and how this error can be minimised by using a decoupling matrix. At the end, a novel miniaturised multi element reconfigurable antenna to represent the receiver base station is designed and tested. The antenna radiation patterns in the azimuth angle are almost omni-directional with linear polarisation. The antenna geometry is uniplanar printed logspiral with striplines feeding network and biased components to improve the impedance bandwidth. The antenna provides the benefit of small size, and re-configurability and is very well suited for the asset tracking applications.

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Giagka, V. "Flexible active electrode arrays for epidural spinal cord stimulation". Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1460520/.

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In spinal cord injured (SCI) individuals the neural pathway between the brain and the extremities is damaged. However, there is still the capacity to elicit muscle activation despite the absence of any supraspinal input. Recent studies have proposed epidural spinal cord electrical stimulation (ESCS) as a means to facilitate locomotor recovery in SCI humans. In epidural stimulation a number of electrodes are placed in the spine, outside the dura, and stimulus current pulses are used to ‘tune’ the spinal circuitries. Some rat studies have supported this concept, but further testing is required to increase our understanding and optimise the stimulation parameters. Testing protocols are currently limited by the available technology. More specifically, the number of electrodes one can use seriously limits the paradigms that could be investigated. For this reason, electrode arrays, as opposed to the conventional pairs of electrodes, can be used to investigate the effect of ESCS at different sites. The development of epidural electrode arrays for chronic testing in rats is a challenging task due to their small size. The difficulties increase radically when a large number of electrodes need to be independently controlled. It has been well documented in the literature that a large number of connections (wires) is highly undesirable because it either makes the implantation procedure more challenging, or, if the device is successfully placed in the body, it could imperil perfusion, result in infections, tissue damage, or simply cause the device to fail. The development of a flexible epidural electrode array suitable for chronic implantation in rats was the main goal of this work. For the first generation of the system, flexible passive 12-electrode arrays, using silicone rubber and annealed platinum foil, were designed and fabricated—suitable for use with an external stimulator. In vivo evaluation of these devices showed that they failed quickly, 87.5% of the connections after a week inside the spine of a rat. The failure analysis performed highlighted the need to reduce the number of connections to avoid inflammation and improve the mechanical stability of the implants. To overcome the connections ‘bottleneck’ without compromising the number of electrodes (which was necessary for the planned paradigm), our approach was to develop application-specific integrated circuits (ASICs) to be embedded on the arrays, acting as electrode drivers. The ASICs reduce the number of connections to 3, feature a very small silicon footprint (less than 0.36 mm2 core area), consume very low power (up to 114 μW during a full stimulation cycle), and allow for the necessary versatility for the testing with a real-time control system, developed by our collaborators (in the FP7 NEUWalk project). A custom designed ‘hub’, designed by Dr. Clemens Eder, is used to electronically – rather than manually – manage the stimulus parameters and the operation of the ASICs. It can be programmed via a graphical user interface (GUI) or the real-time controller. Moving to the second generation of the system, active (with embedded ASICs) epidural arrays were designed, developed and evaluated. For this version, platinum iridium foil, was preferred, due to its superior mechanical strength. The next part of the work focused on the the different aspects of the fabrication and assembly processes. More specifically, size restrictions related to the implantation site dictated the need to use thinned ASICs. To post-process the already fabricated chips, a method for purely mechanical silicon thinning at individual die level was developed and characterised. For the integration of the ASICs on the arrays an evaluation study was conducted to examine the mechanical reliability of the bonds produced by electrical rivet bonding. Combining all the above, a new fabrication process was developed for the active arrays. Despite the fact that, so far, chronic in vivo testing has not been yet implemented, the produced prototypes were electrically and mechanically evaluated in vitro, and results are satisfactory, as no failed tracks were observed during the chronic tests in the lab. The current setup allows power and data to be transferred to the implant real-time through a connector fixed on the rat’s head, while the animal is on a treadmill or on a runway. This implies that there is no need for a wireless system at this stage. However, more complex experiments where the rats would be able to move freely and interact with other rats unrestricted, developing a behaviour that is closer to their natural, could provide significant new knowledge in the future. Although there are still many things to understand regarding epidural stimulation and its effect before planning an experiment like this, this was kept in mind throughout the whole design and development phases of this system. On this basis, the developed subcomponents are compatible with a system level design of a fully implantable platform to be used in freely moving rats, stimulated for 3 – 4 hours per day. This system comprises the active electrode array, which is the focus of this thesis, together with a miniaturised, battery-powered implantable version of the previously mentioned hub (which is on-going work, and is not presented here).

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Yang, Calvin Tseng. "Recording locomotor neural ensemble activity using 3-D microprobe arrays and the development of a flexible planar array for recording spinal small-field cord-dorsum potentials". Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1666917911&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Greenspon, Charles. "Linear multi-electrode arrays for recording population data from the spinal dorsal horn". Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52849/.

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The dorsal horn of the spinal cord is a complex laminar structure integrating exteroceptive signals from the primary afferent fibers into the central nervous system. The laminae of the spinal cord exhibit specialised roles and distinct processes occur across the axes of the dorsal horn. One of the most common in vivo approaches to recording spinal activity is single unit electrophysiology of cells that are believed to be representative of the subjects perception of stimuli. This approach has produced invaluable data but has not progressed in over half a century and fails to account for the specialised processes that occur in each lamina as well as the considerable cellular heterogeneity within and between laminae. In this thesis the use of linear multi-electrode array technology with 16 electrodes spaced 50 μm apart to have a total range of 750 μm that allows for simultaneous recordings across the laminae is developed and validated for the spinal dorsal horns of adult Sprague-Dawley rats. To do this a series of experiments were performed. The placement of the electrode was first optimised by creating a somatotopic map of evoked activity following hindpaw stimulation. A comprehensive series of electrical stimuli designed to induce differential primary afferent fiber activity were then given to establish how well the array could interpret fiber evoked activity. Mechanical and thermal stimulus paradigms were examined to evaluate the spatial distribution of responses across the dorsal horn; after optimisation the responses were then examined in the contexts of acute and chronic pain models. We found that the results of the unsorted multi-spike activity across the array correlated extremely well with predicted responses from single-unit studies in the existing literature. Fiber specific activation restricted along the dorso-ventral axis was detected as was the encoding of mechanical and thermal stimuli that were both innocuous and nocuous in nature. Comparisons between local field potentials and spike activity showed that multi-spike activity represented spinal processing of incoming signals significantly better. Induction of pain models strengthened the argument for the use of the technique by showing that it is capable of being used in both longitudinal and multi-treatment group studies. The approach produced vastly more data than the single-unit technique it builds upon with few drawbacks.

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Libros sobre el tema "Spiral array"

Harrop, James y Christopher Maulucci, eds. Spinal Neurosurgery. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190887773.001.0001.

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Neurosurgery by Example: Key Cases and Fundamental Principles provides case-based, high yield content for the spine surgeon and neurosurgeons preparing for the American Board of Neurological Surgeons oral examination. It covers a wide array of spinal pathologies with their presentation, diagnosis, and treatment plans. Postoperative and complication management strategies are offered as well in order to prepare surgeons who can then provide comprehensive patient care for complex spine conditions.

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Kinsman, Stephen L. Spina Bifida and Related Conditions. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199937837.003.0077.

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The term “spinal dysraphism” encompasses the broadest array of the conditions known as the neural tube defects. The open neural tube defects (spina bifida aperta and cystica) include both disorders of primary and/or secondary neuralation and are best defined as myelomeningocele complex (MMC) due to their protean nervous system manifestations beyond the spinal lesion. Closed spinal dysraphisms (so-called spina bifida occulta) include lipomatous lesions, forms of tethered spinal cord, sinus tracts, and forms of split spinal cord (diastematomyelia). Both genetic and environmental etiologies have been identified. Gene-environment and gene-gene interactions are also important in the pathobiology of these conditions.

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Desai, Mehul y Joseph O'Brien, eds. The Spine Handbook. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199350940.001.0001.

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Spinal disorders, especially back pain, are frequent yet challenging for physicians to manage. While most texts are highly subspecialized or focus on only surgical intervention, The Spine Handbook provides a thorough overview, covering the entire spine, of interdisciplinary treatment of common spinal conditions. Sections build from the foundations of history and examination, radiologic imaging, and behavioral assessment through the core topics of both interventional and surgical options, as well as exploring emerging and special conditions and neuromodulation. Chapters are written by experts from a wide array of fields, including physical therapists, radiologists, psychologists, physiatrists, anesthesiologists, orthopedic spine surgeons, and neurosurgeons. This comprehensive handbook provides the fundamental diagnostic and therapeutic information needed to effectively deliver best-practice care for spinal disorders, making it an ideal reference for physicians of any training level who may encounter or treat spinal disorders.

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Feinman, Jared W. y John G. Augoustides. Neuroprotection for Aortic Surgery and Stenting. Editado por David L. Reich, Stephan Mayer y Suzan Uysal. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190280253.003.0017.

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Despite recent advances, aortic surgery and stenting for an array of diseases still pose a significant risk of permanent and severe injury to the brain and/or spinal cord. These neurological risks are best understood in terms of the primary disease pathology, the extent of aortic involvement, mechanisms and risk factors, the role of neuromonitoring modalities, and the surgical techniques required for repair. This chapter will present an overview of perioperative practice in aortic surgery and stenting based on this framework and the latest guidelines and trials in order to describe best practices and promising options for neuroprotection in this challenging clinical setting.

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Gatta, John. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190646547.003.0001.

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The question of how space becomes place, through human experience and imagination, has for some time occupied scholars of diverse disciplines. This book pursues the further religious question of how places have acquired hallowed or spirit-bearing meaning throughout the course of American literary history—not only in Christian or semipantheistic terms but as outgrowths of the ancient Roman principle of a site’s genius loci. After an opening chapter devoted to representations of home places, commentary proceeds to a chapter devoted to resettlement and pilgrimage themes; then to an inquiry about imagination in place; then to a literary-steeped sampling of diverse American sites and landforms; and finally to a consideration of how place-making and site-based learning might figure in collegiate educational programs. Along the way, this book’s spirit-of-place readings range across texts by canonical figures such as Thoreau, Stowe, Cather, and Wendell Berry as well as an array of lesser-known writers.

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Hao, Joy, Rae Lynne Kinler, Eliezer Soto, Helena Knotkova y Ricardo A. Cruciani. Neurostimulation in pain management. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199656097.003.0099.

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Neurostimulation describes an array of interventions that involve targeted stimulation of peripheral nerve, spinal cord, or the brain. Although few high-quality studies of neurostimulation techniques have been done and the techniques are seldom used in the management of pain related to serious illness, a better understanding of the available treatments and the emergence of newer technologies may increase access and use in the future. Transcutaneous electrical nerve stimulation is considered to be safe and may be used as an adjunct to pharmacotherapy in the routine management of chronic pain. Concerns about electrode placement near tumour masses continue, however, despite reassuring data, and for now, this approach should be used cautiously in those with metastatic disease. The recent advent of non-invasive central nervous system neurostimulation therapies-transcranial direct current stimulation and transcranial magnetic stimulation-offers promising new treatments for pain.

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Jakab, András y Dimitry Kochenov. Introductory Remarks. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780198746560.003.0001.

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This introductory chapter puts emphasis on defiance as one of the most important crises facing the EU today. It briefly showcases the apparent inability of the Union to be effective in ensuring that all its Member States comply with the principles and values underlying the integration project in Europe. An array of countries ranging from Hungary and Greece to Poland illustrates this point. While the values in question are spelled out in the Treaties in an overwhelmingly clear fashion, trying to come up with clear examples of their successful enforcement by the Union should problems arise would leave a sense of loss. Defiance in the face of the EU, including not only the letter and the spirit of the acquis sensu stricto, but also seemingly the very values on which the Union is built, has thus come to affect the Union profoundly.

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Fung, C. Victor. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190234461.003.0001.

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This chapter provides rationales for a philosophy of music education based on classic Chinese philosophies. The philosophy contributes to an array of ways of thinking in music education and emphasizes the quintessence of the human spirit that transcends time and space. The author points to the significance of early Chinese philosophies as postulated in Yijing (The Book of Changes), classic Confucianism (represented by ideologies of Confucius and Mencius), and classic Daoism (represented by ideologies of Laozi and Zhuangzi). Understanding these early classics is critical to understand a characteristically Chinese philosophy. An organismic worldview and a unique perspective in harmony characterize this philosophical inquiry. The author cautions readers about the developments of Confucianism and Daoism evolved after the classics, because their doctrines could be far removed from those of the classics, especially those indicated by prefixes such as “neo-,” “new,” and “contemporary,” or the adjective “religious.”

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Jones, Emily. Irish Home Rule, c.1886–1893. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780198799429.003.0005.

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This chapter centres on the debates over Home Rule between 1886 and 1893, when the issue exploded onto the British political scene. It examines the Gladstonian argument for Home Rule with reference to Burke, as well as the subsequent Liberal Unionist response. Both sides made significant intellectual bids for Burke’s mantle: the Gladstonians sought to establish voluntary political ties (‘the union of hearts’) between Britain and Ireland in an array of parliamentary speeches, periodical articles, edited books, and popular pamphlet literature. The Liberal Unionists looked to Burke’s wider work to show their adherence to the Liberal tradition. The Home Rule debates re-imagined Burke as a proto-Liberal Unionist, agreeable to and allied with Conservatives. The ‘spirit of Burke’ was, therefore, eventually seen to be embodied best of all in the Liberal Unionists who resurrected an anti-Jacobin vocabulary and styled themselves as Old Whigs defending the constitution.

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Conan Doyle, Arthur. Gothic Tales. Editado por Darryl Jones. Oxford University Press, 2018. http://dx.doi.org/10.1093/owc/9780198734307.001.0001.

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‘There was a rumour, too, that he was a devil-worshipper, or something of that sort, and also that he had the evil eye…’ Arthur Conan Doyle was the greatest genre writer Britain has ever produced. Throughout a long writing career, he drew on his own medical background, his travels, and his increasing interest in spiritualism and the occult to produce a spectacular array of Gothic Tales. Many of Doyle’s writings are recognised as the very greatest tales of terror. They range from hauntings in the polar wasteland to evil surgeons and malevolent jungle landscapes. This collection brings together over thirty of Conan Doyle’s best Gothic Tales. Darryl Jones’s introduction discusses the contradictions in Conan Doyle’s very public life - as a medical doctor who became obsessed with the spirit world, or a British imperialist drawn to support Irish Home Rule - and shows the ways in which these found articulation in that most anxious of all literary forms, the Gothic.

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Capítulos de libros sobre el tema "Spiral array"

Chew, Elaine. "The Spiral Array". En International Series in Operations Research & Management Science, 41–60. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-1-4614-9475-1_3.

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Chew, Elaine. "The Spiral Array: An Algorithm for Determining Key Boundaries". En Music and Artificial Intelligence, 18–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45722-4_4.

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Chew, E. y Y. C. Chen. "Mapping Midi to the Spiral Array: Disambiguating Pitch Spellings". En Computational Modeling and Problem Solving in the Networked World, 259–75. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-1043-7_13.

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Arora, Chirag, Shyam S. Pattnaik y R. N. Baral. "Bandwidth Enhancement of Microstrip Patch Antenna Array Using Spiral Split Ring Resonator". En Advances in Intelligent Systems and Computing, 435–41. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7512-4_43.

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Chew, Elaine y Alexandre François. "Visible Humour — Seeing P.D.Q. Bach’s Musical Humour Devices in The Short-Tempered Clavier on the Spiral Array Space". En Communications in Computer and Information Science, 11–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04579-0_2.

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Zaritsky, Dennis y Hans-Walter Rix. "The Shapes of Spiral Galaxy Disks". En Infrared Astronomy with Arrays, 457–60. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1070-9_137.

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Moriondo, G., L. Hunt, C. Baffa, C. Giovanardi, F. Lisi y R. Stanga. "2.2μm Imaging of Early-Type Spiral Galaxies". En Infrared Astronomy with Arrays, 129–31. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1070-9_38.

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Peletier, R. F., E. A. Valentijn, W. Freudling y A. F. M. Moorwood. "Towards The Real Nature Of Spiral Galaxies". En Infrared Astronomy with Arrays, 149–50. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1070-9_47.

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Rix, Hans-Walter y Dennis Zaritsky. "The Mass Density Amplitude Of Spiral Arms". En Infrared Astronomy with Arrays, 151–52. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1070-9_48.

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Manbachi, Amir. "Experimental Evaluation of the Array Performance". En Towards Ultrasound-guided Spinal Fusion Surgery, 73–83. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29832-0_6.

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Actas de conferencias sobre el tema "Spiral array"

Daliri, Ali, Wayne S. T. Rowe, Kamran Ghorbani, Chun H. Wang y Sabu John. "Spiral slotted waveguide antenna array". En 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6711536.

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Yunlin Liu, Yong Wang y Rugui Yang. "A cylindrical spiral patch array". En Proceedings of ISAPE 2000: Fifth International Symposium on Antennas, Propagation, and EM Theory. IEEE, 2000. http://dx.doi.org/10.1109/isape.2000.894733.

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Hinostroza, Israel, Regis Guinvarc'h y Randy L. Haupt. "Low frequency bandwidth in connected spiral arrays". En 2016 IEEE International Symposium on Phased Array Systems and Technology (PAST). IEEE, 2016. http://dx.doi.org/10.1109/array.2016.7832616.

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Elmansouri, Mohamed A., James B. Bargeron y Dejan S. Filipovic. "Ultra-wideband spiral-helix antenna array". En 2014 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2014. http://dx.doi.org/10.1109/aps.2014.6904454.

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Zhang, Zhi-Ya y Guang Fu. "Broadband circularly polarized spiral antenna array". En 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2015. http://dx.doi.org/10.1109/apcap.2015.7374495.

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Hinostroza, Israel, Regis Guinvarc'h y Randy L. Haupt. "Narrow band resonances in planar array of spiral antennas without ground plane". En 2013 IEEE International Symposium on Phased Array Systems and Technology (ARRAY 2013). IEEE, 2013. http://dx.doi.org/10.1109/array.2013.6731886.

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Wang, Lulu, Ahmed Al-Jumaily y Ray Simpkin. "Antenna Array Configuration in Holographic Microwave Imaging". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36556.

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Biomedical imaging has played an important role in identifying and monitoring the effectiveness of the current state of the art treatments for many diseases. We recently proposed a novel holographic microwave imaging array (HMIA) technique for lesion detection. One of the most important considerations of this technique is the antenna array configuration. This paper demonstrates investigation of using various antenna array configurations to generate a high-resolution microwave image by using the HMIA technique. Both simulation and experimental results are obtained and compared using spiral, random and regularly spaced array configurations to fully demonstrate the effectiveness of antenna arrays to the HMIA technique. The results show that the proposed spiral and random array configurations have the ability to produce high-resolution images at significantly lower cost compared to regularly spaced array. The potential biomedical imaging applications of the research findings would be breast cancer detection and/or brain stroke detection.

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Elmansouri, Mohamed A. y Dejan S. Filipovic. "On the use of spiral antenna arrays for short-pulse ultra-wideband applications". En 2013 IEEE International Symposium on Phased Array Systems and Technology (ARRAY 2013). IEEE, 2013. http://dx.doi.org/10.1109/array.2013.6731816.

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Rupcic, Slavko y Vanja Mandric. "Spiral antenna array configurations on spherical surface". En 2013 21st International Conference on Applied Electromagnetics and Communications (ICECom). IEEE, 2013. http://dx.doi.org/10.1109/icecom.2013.6684764.

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Rivera-Lavado, Alejandro, Sergio Llorente-Romano, Francisco-Javier Herraiz-Martinez, Luis-Enrique Garcia-Munoz, Jose-Antonio Lopez-Fernandez, Jose-Antonio Lopez-Perez, Felix Tercero-Martinez y Daniel Segovia-Vargas. "Dyson conical Quad-Spiral Array for VLBI2010". En 2014 8th European Conference on Antennas and Propagation (EuCAP). IEEE, 2014. http://dx.doi.org/10.1109/eucap.2014.6901700.

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Informes sobre el tema "Spiral array"

Edgerton, V. R. Electrode Array Development for Recovery of Stepping Following Spinal Cord Injury. Fort Belvoir, VA: Defense Technical Information Center, diciembre de 2010. http://dx.doi.org/10.21236/ada562459.

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Edgerton, V. R. Electrode Array Development for Recovery of Stepping Following Spinal Cord Injury. Fort Belvoir, VA: Defense Technical Information Center, abril de 2010. http://dx.doi.org/10.21236/ada587581.

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Price, Roz. Metrics and Indicators to Assess Adaptation. Institute of Development Studies, marzo de 2022. http://dx.doi.org/10.19088/k4d.2022.050.

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The field of climate change adaptation metrics is complex and fast-changing. Given the highly contextual nature of adaptation and the array of applied definitions of adaptation and “success”, there is no single global set of adaptation metrics and indicators or definition of adaptation success. There is a burgeoning literature on the Global Goal on Adaptation (GGA), how to measure it and adaptation metrics. However, the landscape is scattered and the subject is very complex. Climate impacts and the effects of adaptation measures themselves spill across national borders, although adaptation is still treated as a largely domestic issue despite the global rhetoric of the GGA. This makes an aggregate global goal extremely technically challenging and tracing the plethora of existing indicators and metrics difficult. Furthermore, there is relatively few specific literature directly on the topic of global measurement of adaptation. This rapid review provides information on some of the metrics and measurement approaches in use across national and sub-national government levels. It gives a brief discussion of the issues around measuring the GGA, flags some key resources in this area and also touches on some initiatives and guidance aimed at helping users to select metrics. This is not a systematic review and given the time limitations and the number of adaptation metrics approaches in use, it is only able to provide a small snapshot of current research.

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