gebhart/patrepeval huggingface dataset:
Steigerung der Blutflußgeschwindigkeit in der Arteria cerebri media nach low-dose Ketamin (1989)

Ketamin in niedriger Dosierung wird zur Analgesie bei Notfallpatienten empfohlen. Nicht einheitlich wird jedoch der Einfluß von Ketamin auf die Hirndurchblutung und den intrakraniellen Druck beurteilt. Bei 10 gesunden Probanden wurde mit Hilfe der transkraniellen Dopplersonographie (TCD) der Einfluß auf die Blutflußgeschwindigkeit in den basalen Hirnarterien nach Injektion von 0,25 mg/kg KG Ketamin untersucht. Systolische und mittlere Flußgeschwindigkeit, Pulsatilitätsindex, Blutdruck, Herzfrequenz sowie Sauerstoffsättigung und endexspiratorisch ermittelter CO2-Partialdruck wurden zeitgleich gemessen. Nach Injektion von Ketamin zeigte sich ein paralleler Anstieg der hämodynamischen Parameter sowie der Flußgeschwindigkeiten in den basalen Hirnarterien bei erniedrigtem Pulsatilitätsindex und konstanter CO2-Spannung sowie Sauerstoffsättigung. Die Resultate sprechen für eine vorübergehende Stimulation der Hämodynamik und gleichzeitiger Widerstandssenkung im Hirnkreislauf. Die Eignung der TCD als Monitoring zerebraler Hämodynamik unter dem Einfluß eines intravenösen Anästhetikums wird diskutiert.
Electron Microscopic Observations on the Effects of Penicillin on the Morphology ofChlamydia psittaci (1970)

L cells were infected at high multiplicity with meningopneumonitis organisms and incubated in medium containing 200 units per ml of penicillin. At intervals up to 48 hr after infection, cells were removed and thin sections were prepared for electron microscopic studies on the morphology of the developing organism. Penicillin had no effect on the initial reorganization of the infecting elementary body to form the developmental reticulate body (RB), and, up to 12 hr after infection, the treated and untreated cultures were identical. After that time, however, penicillin-treated organisms showed striking differences in that binary fission was prevented, large abnormal RB forms were seen in great numbers, masses of RB cytoplasmic membranes and envelopes were formed within and outside the RB itself, and large numbers of empty or partially filled small vesicles were pinched off the RB. After 36 hr immature nucleoids were formed within the RB. Throughout all of this period, both the outer cell envelope and the cytoplasmic membrane of these RB were recognized. When infected cells were transferred into penicillin-free medium, the abnormal RB showed recovery to form normal RB both by a budding-like process and by internal fragmentation or subdivision rather like endosporulation. We have concluded that penicillin inhibits binary fission and prevents the synthesis of certain components essential for the formation of the elementary body envelope.
EFFECTS OF COGNITIVE TASK ANALYSIS-BASED INSTRUCTIONAL GUIDE ON STUDENTS' ACHIEVEMENT IN ELECTRONICS WORK (2015)

This study determined the effects of cognitive task analysis-based instructional guides on technical college students’ achievement in electronics work. The study adopted a quasi-experimental design. The population of the study was 174 Technical college III (TC III) students of all the technical colleges offering Electronics Work in North central, Nigeria. The entire population of 174 students was used for the study from which 90 TC III students comprising of 79 male and 11 female constituted treatment group assigned to cognitive task analysis-based instruction, and 84 TC III students comprising 65 male and 19 female constituted control group assigned to conventional method. Two research questions and three null hypotheses, tested at 0.05 level of significance, guided the study. The instrument used for data collection was Electronics Work Troubleshooting Cognitive Achievement Test (EWTCAT). The instrument was subjected to validation by three experts in vocational and technical education. The trial test for determining the coefficient of stability of the EWTCAT was carried out using test re-test reliability technique. Pearson Product Moment Correlation coefficient was used to determine the reliability of the EWTCAT and it was found to be 0.83. While, the internal consistency of the EWTCAT was checked by Kuder-Richardson 20 (KR20) and was found to be 0.72. Mean was used to answer the research questions; while ANCOVA was employed to test the hypotheses. The study found out that cognitive task analysis-based instructional guide is more effective in improving students’ cognitive achievement in electronics work than the conventional method. There was an effect of gender on students’ cognitive achievement in electronics work favouring boys. Furthermore, the study found out that there are no significant interaction effects of treatment and gender on technical college students’ cognitive achievement in electronics work. It was therefore, recommended among others that Electronics teachers should adopt the use of cognitive task analysis-based instructional guide in teaching electronics.
A tapered loop antenna with broadband characteristics for ultra-wideband radio (2017)

In recent years, radio communication using ultrawideband (UWB) technology has shown great promise for healthcare and medical applications. Although many UWB antennas have been investigated and developed by several research institutes so far, it is difficult to find a loop type of antenna with broadband characteristics covering UWB frequency band. A loop antenna can be useful and effective component used in wristwatch and bracelet typed devices for the healthcare, because it is easy to build in them. In this paper, a loop type of the UWB antenna was proposed and investigated. The Finite Difference Time Domain method was used for the electromagnetic analyses of the antenna characteristics. As a result, the VSWR characteristics of the proposed antenna were less than 2.0 over the UWB frequency band enough in practical use.
On Visnagin and Khellin and Related Compounds. A Simple Synthesis of Chromone (1950)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn Visnagin and Khellin and Related Compounds. A Simple Synthesis of ChromoneAlexander Schönberg and Aly SinaCite this: J. Am. Chem. Soc. 1950, 72, 8, 3396–3399Publication Date (Print):August 1, 1950Publication History Published online1 May 2002Published inissue 1 August 1950https://pubs.acs.org/doi/10.1021/ja01164a022https://doi.org/10.1021/ja01164a022research-articleACS PublicationsRequest reuse permissionsArticle Views430Altmetric-Citations71LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
A CMOS pixel design with binary space-time exposure encoding for computational imaging (2017)

A CMOS pixel design that is capable of spatialtemporal exposure encoding is presented. By integrating selective charge storage units and exposure code memories in an active pixel sensor (APS) structure, the 10 μm×10 μm pixel design performs intermittent exposure according to the received binary exposure codes. Under a 625 nm illumination and with a 3.3 V supply, a 10×10 prototype image sensor fabricated in a 0.13-μm CMOS process demonstrates temporal, spatial, and spatialtemporal exposure encoding at 60 fps. The proposed pixel structure facilitates focal-plane space-time exposure encoding in CMOS image sensors for computational imaging applications.
Urinary melatonin-sulfate/cortisol ratio and the presence of prostate cancer: A case-control study (2016)

The circadian-related hormones, melatonin and cortisol, have oncostatic and immunosuppressive properties. This study examined the relationship between these two biomarkers and the presence of prostate cancer. We measured their major metabolites in urine collected from 120 newly diagnosed prostate cancer patients and 240 age-matched controls from January 2011 to April 2014. Compared with patients with lower urinary melatonin-sulfate or melatonin-sulfate/cortisol (MT/C) ratio levels, those with above-median levels were significantly less likely to have prostate cancer (adjusted OR (aOR) = 0.59, 95% CI = 0.35-0.99; aOR = 0.46, 95% CI: 0.27-0.77) or advanced stage prostate cancer (aOR = 0.49, 95% CI = 0.26-0.89; aOR = 0.33, 95% CI = 0.17-0.62). The combined effect of both low MT/C ratios and PSA levels exceeding 10 ng/ml was an 8.82-fold greater likelihood of prostate cancer and a 32.06-fold greater likelihood of advanced stage prostate cancer, compared to those with both high MT/C ratios and PSA levels less than 10 ng/ml. In conclusion, patients with high melatonin-sulfate levels or a high MT/C ratio were less likely to have prostate cancer or advanced stage prostate. Besides, a finding of a low MT/C ratio combined with a PSA level exceeding 10 ng/ml showed the greatest potential in detecting prostate cancer and advanced stage prostate cancer.
Large changes in refractive index by synchrotron-radiation-driven compaction of hydrogenated silicon nitride films (2002)

When high-energy photons (hν&amp;gt;100 eV) irradiate films of hydrogenated silicon nitride (a-SiNx:H) that have been deposited by plasma-enhanced chemical-vapor deposition, the network of atoms in the material is photolytically rearranged. This reaction proceeds rapidly from the instance the radiation is applied and is almost completed within 200 s. This is in striking contrast with the continuing effect of such radiation on SiO2 (defect formation and decomposition). The result was a change (Δn) in the refractive index at 633 nm of as much as 0.04, and this effect was independent of the temperature of irradiation. By using an effective medium mixture of Si3N4, crystalline Si, and voids to model the dielectric function of a-SiNx:H films, the volumes of the voids and of crystalline Si components were found to be reduced by 44% and 49%, respectively, from their initial values. The resulting 9.8% reduction in the thickness (compaction) is the origin of the large Δn.
An Enhanced Geometric Filter Algorithm With Channel Diversity for Device-Free Localization (2015)

Device-free localization (DFL) techniques estimate a person's location without requiring the person to carry a radio device or tag. In the received signal strength (RSS)-based DFL system, the changes caused by the person's presence in the RSS of links in a wireless network are used to infer his location. A DFL system's accuracy is degraded in cluttered environments due to multipath fading. In this paper, the absolute changes in the RSS of links from different frequency channels are combined into a single measurement vector to mitigate the multipath fading effects. The measurements are then processed by a multichannel geometric filter (MCGF) algorithm that uses link-specific thresholds based on a link's fade level and RSS variance on different frequency channels to detect the target-affected links. In addition, the MCGF algorithm weights probable target locations by the overall fade levels of the target-affected links. Through experiments in both open and cluttered environments, the use of channel diversity and link-specific thresholds is demonstrated to outperform single-channel GF and multichannel methods that are based on radio tomographic imaging in terms of tracking accuracy. The proposed algorithm also has a lower computational overhead compared with existing DFL methods, resulting in much faster execution times.
Evaluation of the Fish Passage Effectiveness of the Bonneville I Prototype Surface Collector using Three-Dimensional Ultrasonic Fish Tracking (2001)

This report describes tests conducted at Bonneville Dam on the Columbia River in the spring of 2000 using three-dimensional acoustic telemetry and computational fluid dynamics hydraulic modeling to observe the response of outmigrating juvenile steelhead and yearling chinook to a prototype surface collector installed at the Powerhouse. The study described in this report was one of several conducted for the U.S. Army Corps of Engineers to prepare a decision document on which of two bypass methods: surface flow bypass or extended-length submersible bar screens to use to help smolts pass around Bonneville dams without going through the turbines.
An empirical analysis of the IEEE 802.11 MAC layer handoff process (2003)

IEEE 802.11 based wireless networks have seen rapid growth and deployment in the recent years. Critical to the 802.11 MAC operation, is the handoff function which occurs when a mobile node moves its association from one access point to another. In this paper, we present an empirical study of this handoff process at the link layer, with a detailed breakup of the latency into various components. In particular, we show that a MAC layer function - probe is the primary contributor to the overall handoff latency. In our study, we observe that the latency is significant enough to affect the quality of service for many applications (or network connections). Further we find variations in the latency from one hand-off to another as well as with APs and STAs used from different vendors. Finally, we discuss optimizations on the probe phase which can potentially reduce the probe latency by as much as 98% (and a minimum of 12% in our experiments). Based on the study, we draw some guidelines for future handoff schemes.
Melt (2016)

The document gives definitions of terms met in the conventional thermal and thermomechanical characterisation of polymeric materials.
Facile Synthesis, Macroscopic Separation, E/Z Isomerization, and Distinct AIE properties of Pure Stereoisomers of an Oxetane-Substituted Tetraphenylethene Luminogen (2016)

Control of stereochemistry plays a key role in medicinal chemistry, material and life science. As a prominent AIE luminogen, tetraphenylethene (TPE) derivatives have E/Z isomers which are challenging to separate even by HPLC. Herein, we designed oxetane-substituted TPE (TPE-2OXE) and separated pure isomers by simple column chromatography with high yields, as confirmed by mass spectrometry, IR and NMR spectroscopy. The isomerization of the two isomers can occur by photo- and thermo-activation. Importantly, (Z)-TPE-2OXE isomer solid shows bathochromic emission with a quantum yield 5 times higher than that of (E)-TPE-2OXE. The differences in emission wavelength and quantum yield are derived from distinct emission mechanisms of locally excited (LE) state emission of (E)-TPE-2OXE and charge transfer (CT) state emission of (Z)-TPE-2OXE. The two isomers are also good piezochromic luminescent materials, which have not only an obvious emission color shift but also significantly enhanced luminescence brightness by external force. In addition, (E)-TPE-2OXE solids show self-healing ability, which can crystallize spontaneously from ground amorphous state. The higher brightness of (E)-TPE-2OXE can be retained in solution, so fluorescent AIE nanodots are prepared from the two isomers. Cell-labeling experiments also show that (Z)-TPE-2OXE AIE dots have higher labeling brightness as compared to the (E)-TPE-2OXE isomer. The synthesis and distinct properties of E/Z isomers are beneficial to further development of new TPE derivatives for various applications.
Propagation Modeling for Radio Frequency Tomography in Wireless Networks (2013)

Non-cooperative localization is an important class of applications with the goal of detecting and tracking objects without their explicit participation. Recognizing that these objects will attenuate any radio signals that pass through them, recent works have proposed using the received signal strength (RSS) measurements from networks of portable wireless devices to detect, localize, and track objects through radio frequency (RF) tomography. Because the effects of these objects on radio signals can be relatively small, accurate radio propagation models are essential to the accuracy and reliability of these methods. Despite their critical importance, only limited work has been done to develop and test such models. In this paper, we describe the RF tomography problem in detail, comparing both existing and novel shadowing models analytically. We design an RF tomography testbed and describe the techniques used to conduct field test measurements. We present the experimental results from our RF tomography testbed comparing several different shadowing models. Further, we present the results of applying the different shadowing models to RSS measurements obtained in a field test and evaluate how well each model approximates the radio propagation experienced during our test.
Dynamic Inter-Operator Spectrum Sharing via Lyapunov Optimization (2017)

The problem of spectrum sharing between two operators in a dynamic network is considered. We allow both operators to share (a fraction of) their licensed spectrum band with each other by forming a common spectrum band. The objective is to maximize the gain in profits of both operators by sharing their licensed spectrum bands rather than using them exclusively, while considering the fairness among the operators. This is modeled as a two-person bargaining problem, and cast as a stochastic optimization. To solve this problem, we propose centralized and distributed dynamic control algorithms. At each time slot, the proposed algorithms perform the following tasks: 1) determine spectrum price for the operators; 2) make flow control decisions of users data; and 3) jointly allocate spectrum band to the operators and design transmit beamformers, which is known as resource allocation (RA). Since the RA problem is NP-hard, we have to rely on sequential convex programming to approximate its solution. To derive the distributed algorithm, we use alternating direction method of multipliers for solving the RA problem. Numerically, we show that the proposed distributed algorithm achieves almost the same performance as the centralized one. Furthermore, the results show that there is a trade-off between the achieved profits of the operators and the network congestion.
Druckverluste durch Einbauten (Teil 2) (2018)

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Degradation of Bacteria by Weakly Ionized Highly Dissociated Radio-Frequency Oxygen Plasma (2008)

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Inductively coupled oxygen plasma was used to study the degradation of <emphasis emphasistype="italic"> Bacillus stearothermophilus</emphasis>. Bacteria were deposited on a silicon wafer substrate and treated by plasma for different periods. The first effect was the removal of the envelope— a protective coating that the bacteria developed during growing. After removing the envelope (capsule), slow etching of the cell wall was observed. Further treatment resulted in the gradual removal of the cell wall, and after 240 s, only ashes remained. The images of plasma interaction steps during the bacteria degradation are presented. </para>
Extracting Brain Connectivity from Diffusion MRI [Life Sciences] (2007)

This article gives a short introduction to dMRI tractography methods. Diffusion magnetic resonance imaging (dMRI) is an MRI modality that has gained tremendous popularity the past five years and is especially promising for imaging the white matter in brain. The dMRI technique has raised hopes in the neuroscience community for a better understanding of the fiber tract anatomy of the human brain. Various methods have been proposed to visualize the anatomy of fiber pathways and to derive connectivity between different parts of the brain in vivo. While there are strong indications that dMRI reveals information about the fiber pathways in the brain, it is important to stress that the explicit measurements are of water diffusion, and not of the axons themselves. This technique allows us to use fibers from multiple brains as input, and thereby obtain a simultaneous clustering and matching of the bundles in all brains.
Generation of engineered core–shell antibiotic nanoparticles (2019)

Well-defined nanocomposite structures have received significant attention due to their superior combinatorial properties. Rational tuning of the core and shell of the nanostructure(s) can offer potent antibacterial activity. Such advanced core-shell nanocomposite methodologies allow not only the incorporation of antibacterial agents on the shell but also provide its stability and nurture antibacterial activity. Herein, antibiotic zinc oxide-curcumin (ZnO-Cum) core-shell nanoparticles for antibacterial application were synthesised. The ZnO-Cum core-shell nanoparticles were prepared by curcumin nanolayer deposition on zinc oxide nanoparticles <i>via</i> a sonication process. The resulting ZnO-Cum core-shell nanoparticles were spiracle in shape with a ∼45 nm ZnO core and ∼12 nm curcumin shell layer size, respectively, determined by transmission electron microscopy. X-ray diffraction analysis confirmed the formation of a core-shell crystal structure. Additionally, UV-DRS and ATR-FTIR spectral analysis support the existence of ZnO and curcumin in a core-shell nanocomposite. The antibacterial activities of nanoparticles developed were studied against <i>Staphylococcus aureus and Streptococcus pneumoniae</i> and <i>Escherichia coli</i> and <i>Shigella dysenteriae</i> bacterial stains using the diffusion method. A greater inhibition of the growth of Gram positive and negative bacteria was noticed upon treatment with core-shell ZnO and curcumin nanoparticles than the commercial antibiotic amoxicillin which indicates their antibacterial property. The findings of this study provide evidence that the zinc oxide-curcumin core-shell nanoparticles may be highly promising for antibacterial and biomedical applications.
Identification and selection rules of the spin-wave eigenmodes in a normally magnetized nanopillar (2011)

We report on a spectroscopic study of the spin-wave eigenmodes inside an individual normally magnetized two-layer circular nanopillar (permalloy$|$copper$|$permalloy) by means of a magnetic resonance force microscope. We demonstrate that the observed spin-wave spectrum critically depends on the method of excitation. While the spatially uniform radio-frequency (rf) magnetic field excites only the axially symmetric modes having azimuthal index $\ensuremath{\ell}=0$, the rf current flowing through the nanopillar, creating a circular rf Oersted field, excites only the modes having azimuthal index $\ensuremath{\ell}=+1$. Breaking the axial symmetry of the nanopillar, either by tilting the bias magnetic field or by making the pillar shape elliptical, mixes different $\ensuremath{\ell}$-index symmetries, which can be excited simultaneously by the rf current. Experimental spectra are compared to theoretical prediction using both analytical and numerical calculations. An analysis of the influence of the static and dynamic dipolar coupling between the nanopillar magnetic layers on the mode spectrum is performed.