gebhart/patrepeval huggingface dataset:
Fast computation of transform coefficients for a subadjacent block for a transform family (1991)

The authors examine several different kinds of subadjacent blocks, and consider fast computation for a transform family including the Walsh-Hadamard transform and the Rh transform as special cases. The approach proposed here provides a direct frequency-frequency procedure. Results indicate that, for this transform family, a reduction of the number of multiplications and additions is achieved by a factor of two-thirds. An example for the Rh transform shows that further reduction of arithmetic operations is also possible. The results of this method are even better for the Walsh-Hadamard transform. The new algorithms can reduce the number of additions from the level O(N log/sub 2/ N) to the level O(N), as compared to the traditional method.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Learning-Based Adaptive Transmission for Limited Feedback Multiuser MIMO-OFDM (2014)

Performing link adaptation in a multiantenna and multiuser system is challenging because of the coupling between precoding, user selection, spatial mode selection and use of limited feedback about the channel. The problem is exacerbated by the difficulty of selecting the proper modulation and coding scheme when using orthogonal frequency division multiplexing (OFDM). This paper presents a data-driven approach to link adaptation for multiuser multiple input mulitple output (MIMO) OFDM systems. A machine learning classifier is used to select the modulation and coding scheme, taking as input the SNR values in the different subcarriers and spatial streams. A new approximation is developed to estimate the unknown interuser interference due to the use of limited feedback. This approximation allows to obtain SNR information at the transmitter with a minimum communication overhead. A greedy algorithm is used to perform spatial mode and user selection with affordable complexity, without resorting to an exhaustive search. The proposed adaptation is studied in the context of the IEEE 802.11ac standard, and is shown to schedule users and adjust the transmission parameters to the channel conditions as well as to the rate of the feedback channel.
Ways to Improve RAIM/AAIM Availability Using Position Domain Performance Computations (1997)

This paper discusses the performance of RAIMIAAIM in
terms of the probabilities of missed and false detection of
a position error of the navigator. The statistical indepen-
dence of position error and test statistic is exploited to
compute missed and false detection probabilities from the
distributions of position error and test statistic straight-
forwardly.
We compute exact probabilities and computationally less
involved approximations, as well as the probabilities that
are obtained when using a conventional method [Leva96]
that works in the measurement rather than the position
domain. The results of the latter prove to be too
pessimistic, and will therefore result in reduced
RAIMIAAIM availability. We also show that representing
the measurement geometry by the worst integrity
measurement only, as is often done, is disadvantageous
with respect to RAIM/AAIM availability.
Linearly ramped temperature transient rapid thermal oxidation of silicon (1988)

New results on the growth kinetics of rapid thermal oxidation of Si using transient linearity ramped saw-toothed and triangular wafer temperature versus time profiles are reported. The peak wafer temperature and the heat-up/cool-down rates were varied in the ranges of 950–1200 °C and 1–200 °C/s, respectively. The grown oxides were ∼20–200 Å thick depending on the growth conditions. A comparison of the experimental data with the numerical simulation results reveals that the thin oxide steady-state dry oxidation kinetics model underestimates the thickness of oxides grown by the ramped temperature transient oxidations.
Global digital satellite highway (1995)

This paper examines various current and future digital technologies, including the future of fiber and cable systems in relation to PCS/PCN. The paper presents consumer requirements in domestic applications, as well as in business environments, and a model suitable for most new technologies such as ISDN and SONET is examined and discussed. For this paper's purpose, ISDN stands for integrated satellite digital network and SONET as satellite/optical network. This paper examines the potential use of low orbit satellites, to communications, DBS (direct broadcasting satellites) and frequency hopping techniques for current and future needs. The on-board switching and processing techniques are considered. Mobile stations will become a wave of the future. Multimedia transmission, ATM, interactive voice, data and video via networks are examined. A marketing summary for future digital business is provided, and the VSAT market is examined. TDMA and CDMA technologies, with respect to growing demand for spectrum, are discussed. New earth station products in antenna, LNAs, HPAs, and modems are examined. Several company mergers are discussed, as well as what they mean for consumers. Analytical research data, facts, findings and future prediction models and assumptions are used by the author to show how satellites will be the dominant communications superhighway for all.
Ultrafine grinding using a fluidized bed opposed jet mill: Effects of process parameters on the size distribution of milled particles (2000)

S.T.P. Pharma Sciences
Electro-optically controlled switching and deflection in domain-engineered LiNbO 3 (2003)

We report a beam deflection technique that exploits electric-field controlled deflection and total internal reflection at the interface between two anti-parallel domains realized in a single crystal lithium niobate wafer. The LiNbO<sub>3</sub> z-cut sample was 500-μm-thick and was photolithographically patterned and poled by means of an applied electric field, in order to realize two adjacent regions of opposite domain orientation. The boundary between these domains should be very regular and free from residual stress, but in practice, a small residual index difference exists at the interface. An electric filed Ez applied across the interface region, produces equal in magnitude, but opposite in sign, refractive index variations between the adjacent anti-parallel domains. For sufficiently large index variation, and for grazing incidence geometry, that is when the incidence angle is between 87° and 89°, we obtain a high efficient beam deflection. Furthermore, if the incidence angle approaches the limit angle, which is about 89°, the Total Internal Reflection (TIR) occurs, producing an abrupt beam switch from transmission to reflection, characterized with a theoretical 100% switching contrast. However, the residual interface stress generates significant Fresnel reflection from this interface at high grazing angles, limiting the switching contrast ratio achievable at 20 dB. We present data obtained for wavelengths of 632.8 nm and 4.5 μm; at the latter wavelength we demonstrated the possibility to perform amplitude modulation faster than mechanical chopping, in a spectral region where no Pockels cells are available.
Dynamic control of permanent magnet synchronous motors for automotive drive applications (1999)

Due to factors such as high power density and efficiency, low torque ripple and maintenance, and extremely wide operating speed range, permanent magnet AC motors (PMAC) are the subject of intense development for traction drive applications. Maximum torque production for both traction performance and electronic gearchanging requires the operating condition to be as close to voltage saturation as possible in the flux weakening region. A fully dynamic model reference flux-weakening controller with feedback linearisation decoupling is presented, which allows the maximum torque-speed trajectory to be followed dynamically, without saturation of the current controllers.
Role of nitric oxide synthesis in the regulation of coronary vascular tone in the isolated perfused rabbit heart (1992)

The differential effects of the three inhibitors on resting coronary perfusion pressure and the acetylcholine induced fall in coronary perfusion pressure suggest that basal and stimulated NO synthesis may be differentially regulated. Reduction in the synthesis of endogenous NO by these compounds potentiates the glyceryl trinitrate induced fall in perfusion pressure, which may have important clinical implications.
Velocity and wall shear-stress measurements in high-Reynolds-number turbulent boundary layers (1997)

Velocity and wall shear stress were measured using hot-wire anemometry in two distinct turbulent boundary layers in the National Diagnostic Facility and have demonstrated some new and unique features of the high Reynolds number turbulent boundary layer. In agreement with the literature, mean velocity profiles showed that the socalled logarithmic region grew continuously for increasing Reynolds number for all of the boundary layers confirming an extended disparity between small and large scale motion. It was also observed from the mean velocity profiles that surface roughness elements of less than 2 viscous lengths caused a noticeable overshoot of the log-law line as the Reynolds number increased which indicated the importance of surface roughness at high Reynolds number even when the roughness height was within the viscous sublayer. Spectra computed from long time-series of the streamwise velocity revealed a bi-modal distribution of energy in the boundary layer close to the wall (50 viscous units) asserting that the large-scale, lowfrequency motions of the boundary layer are important in the near-wall region. Direct shear stress measurements using wire-on-wall and MEMS sensors were compared to the Clauser prediction, and it was seen that the Clauser scaling tended to mask the streamwise (Re.,) dependencies of the boundary layer quantities.
Induction of protective immunity in cattle against infection with Fasciola hepatica by vaccination with cathepsin L proteinases and with hemoglobin (1996)

Two cathepsin L proteinases, cathepsin L1 and cathepsin L2, secreted by liver flukes may be involved in tissue penetration, nutrition, and protection from immune attack. To ascertain the immunoprophylactic potential of these proteinases, and of another molecule, liver fluke hemoglobin (Hb), we performed vaccine trials in cattle. In the first vaccine trial various doses of cathepsin L1 were tested. The mean protection level obtained was 53.7%. In a second vaccine trial cathepsin L1 and Hb elicited 42.5 and 43.8% protection levels, respectively, while a combination of the two molecules induced a significantly higher level of protection (51.9%). Cathepsin L2 was not examined alone; however, vaccination of cattle with a combination of cathepsin L2 and Hb elicited the highest level of protection (72.4%). The animals that received cathepsin L1-Hb or cathepsin L2-Hb showed reduced liver damage as assessed by serum glutamic dehydrogenase and gamma-glutamyl transferase levels. Furthermore, a reduced viability was observed for fluke eggs recovered from all vaccine groups. This anti-embryonation effect of vaccination was particularly evident in the group that received cathepsin L2-Hb where >98% of the eggs recovered did not embryonate to miracidia. Although all vaccine preparations induced high antibody titers which were boosted following the challenge infection, there was no correlation between antibody titers and protection. The results of these trials demonstrate that cathepsin Ls and Hb could form the basis of a molecular vaccine that would not only reduce parasite burden but would also prevent transmission of liver fluke disease.
Intestinal Glucose Absorption Is Lower in Obese than in Lean Zucker Rats (1993)

Obese Zucker (fa/fa) rats had lower intestinal glucose absorption following an intragastric [U-14C]glucose load than lean (+/?) Zucker rats. In the fa/fa animals, the rate of oxidation of the tracer to 14CO2 was similar to that observed in their lean counterparts. Although there were no differences in the incorporation of the tracer in liver and skeletal muscle glycogen, the conversion and incorporation of [U-14C]glucose into tissue [14C]lipid was higher in the obese animals. Isolated enterocytes from lean and obese Zucker rats showed a similar capacity for [U-14C]glucose utilization. Reconstituted brush border membrane vesicles from obese Zucker rats showed a higher Vmax for glucose transport than those from their lean counterparts. The lower glucose absorption found in the fa/fa rats in vivo may contribute to the maintenance of normoglycemia in these animals.
<i>k</i> -anonymous secret handshakes with reusable credentials (2004)

The problem of privacy-preserving authentication has been extensively investigated in a set of diverse system settings. However, a full-fledged such mechanism called secret handshake, whereby two users (e.g., CIA agents) authenticate each other in a way that no one reveals its own membership (or credential) unless the peer's legitimacy was already ensured of, remains to be elusive because simultaneity of authentication must be guaranteed even in the presence of an active adversary that may act as a handshake initiator or responder. The state-of-the-art secret handshake scheme is very efficient, but imposes on the users the following restriction: either they have to use one-time credentials, or they have to suffer from the privacy degradation that all the sessions involving a same user (or credential are trivially linkable. In this paper, we present the first secret handshake schemes that achieve unlinkability while allowing the users to reuse their credentials (i.e., unlinkability is not achieved by means of one-time credentials). Specifically, we introduce the concept of $k$-anonymous secret handshakes where $k$ is an adjustable parameter indicating the desired anonymity assurance. We present a detailed construction based on public key cryptosystems, and sketch another based on symmetric key cryptosystems. Both schemes are efficient, and can even be seamlessly integrated into a standard public key infrastructure (PKI). Moreover, and their security analysis does not resort to any random oracle.
Large bearing operation without retainer (1978)

The design and testing of large high-speed ball bearings for space application is described. A well-defined lubrication system to provide oil to both race contacts in zero g allows stable operation without ball retainer.
Oxiradical-dependent photoemission induced by a phacoemulsification probe. (1992)

Oxygen free radical formation by conventional phacoemulsification devices has been postulated as a possible mechanism of corneal endothelial damage during surgery. To test this hypothesis, phacoemulsification probe-induced free radical production was visualized using a single photon-counting camera and an O(2-)-sensitive luciferin derivative, 2-methyl-6-[p-methoxyphenyl-3,7-dihydroimidazo [1,2-a]pyrazin-3-one (MCLA), which allows the visualization of spatial and temporal alterations in free radical production. Within 1 min after starting ultrasound emission, MCLA-dependent chemiluminescence was increased significantly, the intensity of which was maximal at the tip of the probe and tapered along a gradient toward distal portions. The chemiluminescence was suppressed significantly by adding either superoxide dismutase (300 U/ml) or sodium azide (20 mmol/l). By adding deuterium to the medium, MCLA-dependent chemiluminescence significantly increased, suggesting the involvement of singlet oxygen in the reaction.
Recognition of α-amino acid derivatives by N,N′-dibenzylated S,S-(+)-tetrandrine (2004)

Complexation of free and N-acetylated alpha-amino acid anions (Gly, Ala, Phe) and some structurally related guests by a dicationic cyclophane-type N,N'-dibenzylated chiral derivative of a bisisoquinoline macrocyclic alkaloid S,S-(+)-tetrandrine (DBT) has been studied by (1)H-NMR titrations in D(2)O. In contrast to other macrocyclic hosts like cyclodextrins and calixarenes, DBT shows highest affinity and large enantioselectivity (K(S)/K(R) >/=10) toward smaller N-acetylalanine and binds larger phenylalanine derivatives more weakly and non-selectively. With 1,2,3,4-tetrahydroisoquinoline-3-carboxylate, a rigid analog of phenylalanine, binding again becomes enantioselective with K(S)/K(R)= 3.8. The binding specificity of DBT is rationalized on the basis of molecular mechanics calculations.
C-Prenylation of phenols promoted by aluminum oxide surfaces (1986)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTC-Prenylation of phenols promoted by aluminum oxide surfacesKarl Heinz Gluesenkamp and George BuechiCite this: J. Org. Chem. 1986, 51, 23, 4481–4483Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published inissue 1 November 1986https://pubs.acs.org/doi/10.1021/jo00373a030https://doi.org/10.1021/jo00373a030research-articleACS PublicationsRequest reuse permissionsArticle Views667Altmetric-Citations15LEARN 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
Microtubule-Associated Proteins: Their Potential Role in Determining Neuronal Morphology (1988)

The brain's default mode network consists of discrete, bilateral and symmetrical cortical areas, in the medial and lateral parietal, medial prefrontal, and medial and lateral temporal cortices of the human, nonhuman primate, cat, and rodent brains. Its ...Read More
A Fully Integrated Transformer-Coupled Power Detector With 5 GHz RF PA for WLAN 802.11ac in 40 nm CMOS (2015)

This paper introduces a fully integrated direct power detector that monitors both RF current and RF voltage to detect the RF output power of the on-chip RF PA realized in a standard 40 nm CMOS process. The RF current measurement is realized by a sense winding in the output transformer, while the RF voltage waveform measurement is performed by capacitive division of the RF output voltage. Since the RF current and the RF voltage are both acquired, this power detector accurately and continuously determines the real output power of the RF PA with a maximum inaccuracy of ±0.5 dB over a wide 32.5 dB dynamic range. This power detector was integrated together with a 5 GHz RF PA designed for the WLAN IEEE 802.11ac communication standard. The power detector is capable of performing a RF output power measurement even for an antenna impedance mismatch up to voltage standing wave ratio (VSWR) 2.8:1 with an accuracy of ±1 dB, which allows the power detector to be used in an automatic antenna-mismatch correction system to prevent performance degradation in the RF PA. Finally, since the proposed power detector can be completely incorporated inside the RF PA output transformer. It results in zero area overhead, proving a very cost effective design.
Let's Use Fertilizers Right (1949)

We seem to be pretty well agreed in Iowa that it pays to use commerical fertilizers. But a lot of us are still trying to find the right ones to use for the right crop. We are still not certain as to HOW to use fertilizers to get the most from them.
Sulfur content of crude rapesseed oil from aqueous extraction (1980)

Abstract Dry heating of rapeseed before grinding increased the sulphur content of the crude rapeseed oil. Boiling the seeds in H 2 O before grinding caused a slight decrease in the sulphur level of the oil. Control of pH during boiling of the ground rapeseed increased the sulphur content of the oil from ca. 2 ppm at pH 3.1 to ca. 10 ppm at pH 7.6.
Caveolin‐1: an ambiguous partner in cell signalling and cancer (2008)

Caveolae are small plasma membrane invaginations that have been implicated in a variety of functions including transcytosis, potocytosis and cholesterol transport and signal transduction. The major protein component of this compartment is a family of proteins called caveolins. Experimental data obtained in knockout mice have provided unequivocal evidence for a requirement of caveolins to generate morphologically detectable caveolae structures. However, expression of caveolins is not sufficient per seto assure the presence of these structures. With respect to other roles attributed to caveolins in the regulation of cellular function, insights are even less clear. Here we will consider, more specifically, the data concerning the ambiguous roles ascribed to caveolin-1 in signal transduction and cancer. In particular, evidence indicating that caveolin-1 function is cell context dependent will be discussed.
Characterization of metamorphic InxAl1−xAs∕GaAs buffer layers using reciprocal space mapping (2007)

The depth profiles of metamorphic InxAl1−xAs (0.05&lt;x&lt;1) buffer layers grown on GaAs substrates were characterized using the x-ray reciprocal space mapping. Three types of metamorphic samples were investigated and compared: step grade, single-slope linear grade, and dual-slope linear grade. The lattice mismatch, residual strain, crystallographic tilt, tilt azimuth, and the full width at half maximum were obtained from the reciprocal space maps. The tilt angle of linearly graded buffer layers stayed low at low In compositions until In≈60%, at which composition the tilt angle increased abruptly. All linear-grade samples had an untilted relaxed structure in the low In region (below 60% In) and a tilted structure in the upper, high In region (above 60% In). The average lattice mismatch between the untilted relaxed structure and the tilted structure determines the tilt angle. The tilt angle of the step-graded layers increased at a near-linear rate as the In composition was increased. The tilt azimuth was intermediate between the ⟨100⟩ and ⟨110⟩ in-plane directions. The x-ray full width at half maximum generally increased with the In composition, but tended lower toward surface. We suggest a possible design strategy for the linear-grade metamorphic buffer layer based on our result.