gebhart/patrepeval huggingface dataset:
Multiple Phase Center Performance of Reflector Antennas Using a Dual Mode Horn (2006)

A new application for reflector antennas is proposed and developed. Using the aperture theory, a phase center on the reflector aperture is determined and shown that, its location is dependent on the field distribution. The proposed concept is, initially, verified by using a symmetric reflector. It is shown that the phase center is located at the aperture geometric center, when the reflector is illuminated symmetrically about its principal planes. Then, a dual mode feed, employing TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes, is used for generating different reflector illuminations, and causing displacement of its phase center. The concept is then extended to offset reflectors, and the influence of the reflector geometry on the phase center displacement and other reflector electrical parameters is investigated. Based on the established feed radiation pattern requirements, a feed horn is designed using circular waveguide that can propagate both modes. By modifying the amplitude and phase of the modes in the horn, a controlled asymmetric reflector aperture field is achieved. A prototype feed horn is fabricated and tested for its dual mode radiation patterns. The results are in good agreement with simulations. The reflector phase center properties are then investigated, by using the designed feed. A reflector-feed assembly, with its dual phase center capability, was developed for improving the performance of the ground moving target indicator radars. The concept allows the conversion of a single reflector to two or more reflectors, simply by modifying the mode excitation amplitudes and phases, in the feed alone
Cover song identification with 2D Fourier Transform sequences (2017)

We approach cover song identification using a novel time-series representation of audio based on the 2DFT. The audio is represented as a sequence of magnitude 2D Fourier Transforms (2DFT). This representation is robust to key changes, timbral changes, and small local tempo deviations. We look at cross-similarity between these time-series, and extract a distance measure that is invariant to music structure changes. Our approach is state-of-the-art on a recent cover song dataset, and expands on previous work using the 2DFT for music representation and work on live song recognition.
ChemInform Abstract: An Improved and Efficient Synthesis of 2‐Substituted 1,4‐Dihydropyridine Derivatives via Regiospecific Bromination. (1989)

ChemInformVolume 20, Issue 26 Heterocyclic Compounds ChemInform Abstract: An Improved and Efficient Synthesis of 2-Substituted 1,4-Dihydropyridine Derivatives via Regiospecific Bromination. I. SIRCAR, I. SIRCAR Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this authorK. R. ANDERSON, K. R. ANDERSON Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this authorL. BONADIES, L. BONADIES Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this author I. SIRCAR, I. SIRCAR Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this authorK. R. ANDERSON, K. R. ANDERSON Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this authorL. BONADIES, L. BONADIES Parke-Davis Pharm. Res. Div., Warner-Lambert Co., Ann Arbor, MI 48105, USASearch for more papers by this author First published: June 27, 1989 https://doi.org/10.1002/chin.198926191Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume20, Issue26June 27, 1989 RelatedInformation
Mannitol facilitates neurotrophic factor up‐regulation and behavioural recovery in neonatal hypoxic‐ischaemic rats with human umbilical cord blood grafts (2009)

We recently demonstrated that blood-brain barrier permeabilization using mannitol enhances the therapeutic efficacy of systemically administered human umbilical cord blood (HUCB) by facilitating the entry of neurotrophic factors from the periphery into the adult stroke brain. Here, we examined whether the same blood-brain barrier manipulation approach increases the therapeutic effects of intravenously delivered HUCB in a neonatal hypoxic-ischaemic (HI) injury model. Seven-day-old Sprague-Dawley rats were subjected to unilateral HI injury and then at day 7 after the insult, animals intravenously received vehicle alone, mannitol alone, HUCB cells (15k mononuclear fraction) alone or a combination of mannitol and HUCB cells. Behavioural tests at post-transplantation days 7 and 14 showed that HI animals that received HUCB cells alone or when combined with mannitol were significantly less impaired in motor asymmetry and motor coordination compared with those that received vehicle alone or mannitol alone. Brain tissues from a separate animal cohort from the four treatment conditions were processed for enzyme-linked immunosorbent assay at day 3 post-transplantation, and revealed elevated levels of GDNF, NGF and BDNF in those that received HUCB cells alone or when combined with mannitol compared with those that received vehicle or mannitol alone, with the combined HUCB cells and mannitol exhibiting the most robust neurotropic factor up-regulation. Histological assays revealed only sporadic detection of HUCB cells, suggesting that the trophic factor-mediated mechanism, rather than cell replacement per se, principally contributed to the behavioural improvement. These findings extend the utility of blood-brain barrier permeabilization in facilitating cell therapy for treating neonatal HI injury.
Proof of concept of wayside railroad wheel inspection using a laser-air hybrid ultrasonic technique (2003)

Non-destructive inspection of railroad wheels is performed in maintenance shops, where wheels are removed and inspected individually. No technique is yet available to the railroad industry to perform wayside inspections of wheels on a moving train. The characteristics of laser and air-coupled ultrasound are discussed to justify the use of a laser-air hybrid ultrasonic technique. Laser generation of ultrasound is combined with air-coupled detection to provide a flexible non-contact and remote technique that would enable the railroad industry to perform wayside inspections of moving railroad wheels. The present paper describes Proof of Concept set-up and results of the experiments performed at the Transportation Technology Center facilities, in Pueblo, Colorado. Sensors are used to detect the position of the wheel, drive a two-position mirror to direct the laser beam to one of two test stations and trigger the laser when the wheel is in position for detection. Wheels are inspected for subsurface shattered rim cracks, thermal fatigue cracks along the tread and the flange areas of the wheel. Analysis is based on the time domain radio frequency (RF) signal and time-frequency wavelet transforms. The experimental results are promising, indicating that dynamic wayside inspections are possible with the laser-air hybrid ultrasonic technique.
Ultrahigh-sensitivity fiber-optic strain and temperature sensor (1998)

We report ultrahigh-sensitivity static strain sensing (noise equivalent strain </=1.5n rms) by two fiber etalon cavities made from silica and fluoride fibers. The anomalous thermo-optic coefficient of fluoride glass fibers allows for determination of thermal and laser drift. This sensor is also capable of simultaneous strain and temperature measurement, with errors in strain and temperature of 6.4% and 0.68%, respectively.
Abstract 4998: Elevated Oxidized Phospholipids on Apolipoprotein B-100 Particles Predict 6-Year Cardiovascular Events in the Epic-Norfolk Study: Potentiation of Risk with Lipoprotein-Associated (Lp-PLA <sub>2</sub> ) and Soluble Phospholipase A2 (sPLA <sub>2</sub> ) Activity (2008)

Objective: We aimed to assess whether oxidized phospholipids on apoB-100 particles (OxPL/apoB) predict future coronary heart disease (CHD) in the prospective EPIC-Norfolk cohort of apparently healthy men and women aged 45–79 years followed up 1993–2007. Methods and Results: Cases who developed CHD during follow-up were matched to controls who remained free of cardiovascular disease and who matched to cases by sex, age and enrollment time. OxPL/apoB levels were measured with antibody E06 in 905 cases and 1809 controls. Subjects in the highest quartile of OxPL/apoB at entry in the study had significantly higher risk of future CHD events (OR 1.72, 95%CI 1.32–2.24, p<0.0001) compared to those in the lowest quartile. This relationship was present in both men and women and was also observed after adjustment for sex, age, diabetes, smoking, blood pressure, LDL-C, HDL-C and Framingham Risk Score (FRS). The risk of future CHD events was significantly potentiated by elevated activity levels of sPLA 2 and Lp-PLA 2 . Subjects in the highest tertiles of both OxPL/apoB and LpPLA2 (OR 2.22 [1.51–3.27]) or OxPL/apoB and sPLA 2 (OR 4.34 [2.84 – 6.64]) had significantly higher risk of future CHD than subjects in the lowest tertiles (p<0.0001 for both). Area under receiver operating curves revealed significantly increased values by adding OxPL/apoB and sPLA 2 to traditional risk factors and the FRS. Strong inverse associations were noted between the OxPL/apoB and VLDL and IDL size, CETP mass and RANK Ligand. Conclusion: Elevated OxPL/apoB levels are a strong, independent predictor of CHD events. The predictive values is further enhanced by elevated activity levels of sPLA 2 and Lp-PLA 2 , which mediate breakdown of OxPL present on lipoproteins and within atherosclerotic lesions. This study links several pathophysiologically related oxidative biomarkers in the prediction of CHD events and suggests novel approaches to predicting CHD risk in apparently health men and women.
Inductor Winding Capacitance Cancellation Using Mutual Capacitance Concept for Noise Reduction Application (2006)

In this paper, the properties of mutual capacitance between two capacitors are first discussed. It is found that the effects of mutual capacitance can be represented by two positive or negative capacitors across the two capacitors. These two equivalent capacitors can be used to cancel the parasitic capacitance of inductors. Because the mutual capacitance can be emulated using two small capacitors, the proposed method can easily be implemented in practical components. The prototypes are then built and the cancellation is verified using a network analyzer. Further EMI measurements in a practical power circuit prove that there is a significant improvement in the inductor's filtering performance.
BIODOSIMETRY ON SMALL BLOOD VOLUME USING GENE EXPRESSION ASSAY (2010)

This paper reports the development of a biodosimetry device suitable for rapidly measuring expression levels of a low-density gene set that can define radiation exposure, dose and injury in a public health emergency. The platform comprises a set of 14 genes selected on the basis of their abundance and differential expression level in response to radiation from an expression profiling series measuring 41,000 transcripts. Gene expression is analyzed through direct signal amplification using a quantitative Nuclease Protection Assay (qNPA). This assay can be configured as either a high-throughput microplate assay or as a handheld detection device for individual point-of-care assays. Recently, we were able to successfully develop the qNPA platform to measure gene expression levels directly from human whole blood samples. The assay can be performed with volumes as small as 30 microL of whole blood, which is compatible with collection from a fingerstick. We analyzed in vitro irradiated blood samples with qNPA. The results revealed statistically significant discrimination between irradiated and non-irradiated samples. These results indicate that the qNPA platform combined with a gene profile based on a small number of genes is a valid test to measure biological radiation exposure. The scalability characteristics of the assay make it appropriate for population triage. This biodosimetry platform could also be used for personalized monitoring of radiotherapy treatments received by patients.
Vibration damping system (1993)

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Nayomon Uno, Masao Mutaguchi; Vibration damping system. J. Acoust. Soc. Am. 1 December 1993; 94 (6): 3533. https://doi.org/10.1121/1.407155 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAcoustical Society of AmericaThe Journal of the Acoustical Society of America Search Advanced Search |Citation Search
Quality surveillance algorithm for erbium-doped fiber amplifiers (2006)

Gain-flattened erbium-doped fiber amplifiers (EDFAs) have become key components for optical communication systems and networks. A failure of one of these devices interrupts data transmission on the affected link completely and causes significant loss of income to the carrier. Therefore, detection of the EDFA's performance degradation is mandatory, since amplifiers can be replaced before they fail. State of the art techniques can only detect aging of the pump laser. In this paper, a novel algorithm is presented that allows for the detection of various degradation mechanisms. The algorithm allows to supervise the complete optical path within the EDFA and is based on appropriate modeling of the gain characteristics of the erbium-doped fiber. Thus, aging effects can be detected for arbitrary channel loads and power distributions at the input of the amplifier stage. Since the effect of pump excited state absorption (ESA) is included in the model, the algorithm is also applicable to amplifier stages using high power pumps.
Secret Key Extraction from Wireless Signal Strength in Real Environments (2012)

We evaluate the effectiveness of secret key extraction, for private communication between two wireless devices, from the received signal strength (RSS) variations on the wireless channel between the two devices. We use real world measurements of RSS in a variety of environments and settings. The results from our experiments with 802.11-based laptops show that in certain environments, due to lack of variations in the wireless channel, the extracted bits have very low entropy making these bits unsuitable for a secret key, an adversary can cause predictable key generation in these static environments, and in dynamic scenarios where the two devices are mobile, and/or where there is a significant movement in the environment, high entropy bits are obtained fairly quickly. Building on the strengths of existing secret key extraction approaches, we develop an environment adaptive secret key generation scheme that uses an adaptive lossy quantizer in conjunction with Cascade-based information reconciliation and privacy amplification. Our measurements show that our scheme, in comparison to the existing ones that we evaluate, performs the best in terms of generating high entropy bits at a high bit rate. The secret key bit streams generated by our scheme also pass the randomness tests of the NIST test suite that we conduct. We also build and evaluate the performance of secret key extraction using small, low-power, hand-held devices-Google Nexus One phones-that are equipped 802.11 wireless network cards. Last, we evaluate secret key extraction in a multiple input multiple output (MIMO)-like sensor network testbed that we create using multiple TelosB sensor nodes. We find that our MIMO-like sensor environment produces prohibitively high bit mismatch, which we address using an iterative distillation stage that we add to the key extraction process. Ultimately, we show that the secret key generation rate is increased when multiple sensors are involved in the key extraction process.
Diagnostics From Imaging Inside Gas Turbine Combustors (1986)

This paper discusses the concept, design and testing of a fiber optic viewing system that records flame images, wavelength spectra and flicker frequencies from inside an operating gas turbine combustor. The image, wavelength spectrum and flicker frequencies give a new type of signature of the combustor that can be related to certain engine operating conditions and malfunctions. Flame data along with other engine and sensor data taken over long periods of time and under different engine conditions can give signatures to help diagnose developing, impending or suddenly occurring problems in the engine hot gas path. The diagnosis of problems should help prevent further or additional damage to the engine or predict overhaul schedules. We would also hope to identify unusual operating conditions or modes that could be avoided in normal operation. A program has been underway with the Electric Power Research Institute to develop such a viewing system. The program has been through planned stages of conceptual design, fabrication, testing in a high pressure combustor rig and is currently being field tested on a utility gas turbine at Houston Light and Power. The flame image is taken from the combustor at the distal end of a small diameter probe with a fixed wide angle field-of-view lens. Fiber optics transfers the image outside the combustor to a nearby video camera. The video image is digitized and calculations of magnitude, position, size and orientation are made on the flame image pattern. Contour plots and differences between image patterns can also be generated for further analysis. Changes in wavelength and flicker frequencies can be recorded and the flicker signal can be cross correlated with acoustic signals from the same combustor. During the rig testing phase of the program several modifications were made to the combustor to simulate problems. These modifications included: generation of air flow nonuniformities, fuel nozzle changes, simulated liner damage, fuel, water injection and air flow changes. Some results from these tests and the field engine tests will be presented.
Alumina Production Technologies - Current Status and Prospective Trends (2015)

World aluminium oxide (alumina) production exceeds 150 million tons per year with > 95 % of it being used for manufacturing of primary aluminium and accounts for about 40 % of production cost of the latter. Making alumina cheaper and in a sustainable way is an urgent need of mankind. During over 150 years of industrial alumina production, the industry became mature and there seems to be little room for major improvement. Nevertheless, several companies in the world are developing innovative processes that could make a breakthrough in the years to come. The presentation describes state of the art and potential for improvement of established alumina technologies in fields of energy efficiency, residue generation, capital and operation cost, as well as status of new developments in the process of alumina production from different raw materials by different methods, including gaps that need to be covered and potential benefits of new processes.
Validation of a Footwear-Based Gait Analysis System With Action-Related Feedback (2015)

Quantitative gait analysis enables clinicians to evaluate patient mobility and to diagnose neuromuscular disorders. The clinical application of gait analysis is currently limited by the high operating costs of gait laboratories. The use of instrumented footwear that performs out of the lab measurements on subjects' walking patterns is a promising way to overcome this limitation. Besides serving as assessment tools, such devices can also act as retraining tools that help regulate a patient's gait with acoustic or vibrotactile stimuli.
Restoration of images degraded by mechanical vibrations (2002)

A method of calculating numerically the optical transfer function appropriate to any type of image motion and vibration, including random ones, has been developed. This method has been verified experimentally, and the close agreement justifies implementation in image restoration for blurring deriving from any type of image motion. The goal of this research is to recover the original image from its degraded version. There are many methods of image restoration based on the point spread function. One of the common methods is the Wiener filter. Here, some image restorations of physically degraded images are presented, based on a constrained least squares improvement of the original Wiener filter. The key to restoration is determination of the optical transfer function unique to each particular image motion and vibration.
Building high accuracy bloom filters using partitioned hashing (2007)

The growing importance of operations such as packet-content inspection, packet classification based on non-IP headers, maintaining flow-state, etc. has led to increased interest in the networking applications of Bloom filters. This is because Bloom filters provide a relatively easy method for hardware implementation of set-membership queries. However, the tradeoff is that Bloom filters only provide a probabilistic test and membership queries can result in false positives. Ideally, we would like this false positive probability to be very low. The main contribution of this paper is a method for significantly reducing this false positive probability in comparison to existing schemes. This is done by developing a partitioned hashing method which results in a choice of hash functions that set far fewer bits in the Bloom filter bit vector than would be the case otherwise. This lower fill factor of the bit vector translates to a much lower false positive probability. We show experimentally that this improved choice can result in as much as a ten-fold increase in accuracy over standard Bloom filters. We also show that the scheme performs much better than other proposed schemes for improving Bloom filters.
Quantification of body‐torso‐wide tissue composition on low‐dose <scp>CT</scp> images via automatic anatomy recognition (2019)

Motivated by applications in cancer and systemic diseases, our goal in this paper was to seek a practical method for body composition quantification which is automated, accurate, and efficient, and works on BT in low-dose CT. The proposed AAR-BCA method toward this goal can quantify four tissue components including SAT, VAT, bone tissue, and muscle tissue in the body torso with under 5% overall error. All needed parameters can be automatically estimated from the training datasets.