gebhart/patrepeval huggingface dataset:
An analysis of thin-rod flexural acoustic wave gravimetric sensors immersed in liquid (1991)

A perturbation analysis of acoustic wave propagation properties for a stiff thin rod surrounded by a liquid is presented. A study is made of the velocity sensitivity of the lowest flexural acoustic mode, F(11), along a thin rod due to mass changes in the rod and variations in the surrounding liquid density. It is shown that the presence of the liquid decreases the velocity of the F(11 ) mode and also the mass sensitivity.
Differentiable Spectrum Partition for Fractional Frequency Reuse in Multi-Cell OFDMA Networks (2010)

To mitigate inter-cell interference (ICI) and achieve higher spectrum efficiency, fractional frequency reuse (FFR) has been widely adopted by the next generation wireless systems, wherein different frequency reuse factors are applied to cell center and cell edge zones. In such conventional FFR, a contiguous radio spectrum is partitioned in a fixed fashion across all cells for edge and cell center zones. This approach evidently lacks the flexibility of inter-cell and/or intra-cell resource allocation adjustment and the capability of dealing with traffic load fluctuation and quality of service (QoS) requirements variations. This paper models the implementation of FFR in a multi-cell network environment and proposes a scheme called D-FFR that can adaptively partition radio spectrum in a distributed manner to achieve different FFR configuration among different cells. Resource demands and various inter-cell/intracell allocation constraints are accounted in D-FFR to enable differentiable inter-cell and/or intra-cell throughput and deliver higher spectrum efficiency. Analytical and extensive simulation results are provided in the paper to validate the effectiveness of our proposed scheme.
Tetrapolar measurement of cervical tissue structure using impedance spectroscopy (2002)

The aim was to see if cervical tissues could be differentiated in terms of their impedance spectra. Transfer impedance data over the frequency range 9.6-1200 kHz were collected from the cervix in 44 women. A tetrapolar surface electrode probe was used with an electrode separation such that the volume of sensitivity extends to a depth of approximately 400 /spl mu/m in the tissue. Published microscopy data showing the cell structures associated with normal squamous epithelium, columnar tissue and various pre-malignant stages was used to set up 3200 node electrical mesh models including the cell membranes and cell arrangements. These models showed that differences in transfer impedance spectra could be expected from the different tissue structures. Predicted spectra for normal and premalignant tissues have been tested against measured data from patients. Confirmation of tissue type was by biopsy and observation during colposcopy. Impedance spectra have been fitted to a Cole type equation in the impedance plane and very significant differences have been found between columnar and normal squamous epithelial tissues. There is good agreement between the model predictions and the measured impedance spectra. It is shown that data collected from high grade cancer-in-situ tissues are well separated from normal squamous epithelial tissues.
mm-Wave N-polar GaN MISHEMT with a self-aligned recessed gate exhibiting record 4.2 W/mm at 94 GHz on Sapphire (2016)

GaN based high electron mobility transistors have emerged as a leading technology for mm-wave solid state power amplification at W-band. To date, reports on W-band GaN HEMTs and MMICs have primarily featured devices grown in the Ga-polar orientation [1, 2]. In this work, the advantages of the N-polar orientation are exploited to produce a MISHEMT exhibiting record high 4.2 W/mm peak output power (Pout) at 94 GHz. The key enabling advantage of N-polar GaN devices are their inverted polarization fields. These fields create a natural, charge-inducing back-barrier that decouples the tradeoff between aspect ratio and channel electron density. Further, the reversed field in an AlGaN cap above the GaN channel opposes gate leakage and improves breakdown voltage [3]. Additionally, to mitigate surface-state induced dispersion and enhance the conductivity of the access regions, a GaN cap layer is added in the access regions through which the gate is recessed [4]. The fabrication process reported in this paper extends that of [4, 5] to have the foot gate metal deposited in a self-aligned fashion to the GaN cap recess etch.
Discovery of functionally selective C5aR2 ligands: novel modulators of C5a signalling (2016)

The complement cascade is comprised of a highly sophisticated network of innate immune proteins that are activated in response to invading pathogens or tissue injury. The complement activation peptide, C5a, binds two seven transmembrane receptors, namely the C5a receptor 1 (C5aR1) and C5a receptor 2 (C5aR2, or C5L2). C5aR2 is a non-G-protein-signalling receptor whose biological role remains controversial. Some of this controversy arises owing to the lack of selective ligands for C5aR2. In this study, a library of 61 peptides based on the C-terminus of C5a was assayed for the ability to selectively modulate C5aR2 function. Two ligands (P32 and P59) were identified as functionally selective C5aR2 ligands, exhibiting selective recruitment of β-arrestin 2 via C5aR2, partial inhibition of C5a-induced ERK1/2 activation and lipopolysaccharide-stimulated interleukin-6 release from human monocyte-derived macrophages. Importantly, neither ligand could induce ERK1/2 activation or inhibit C5a-induced ERK1/2 activation via C5aR1 directly. Finally, P32 inhibited C5a-mediated neutrophil mobilisation in wild-type, but not C5aR2(-/-) mice. These functionally selective ligands for C5aR2 are novel tools that can selectively modulate C5a activity in vitro and in vivo, and thus will be valuable tools to interrogate C5aR2 function.
Video-rate tomographic phase microscopy (2011)

Tomographic phase microscopy measures the 3-D refractive index distribution of cells and tissues by combining the information from a series of angle-dependent interferometric phase images. In the original device, the frame rate was limited to 0.1 frames per second (fps) by the technique used to acquire phase images, preventing measurements of moving or rapidly changing samples. We describe an improved tomographic phase microscope in which phase images are acquired via a spatial fringe pattern demodulation method, enabling a full tomogram acquisition rate of 30 fps. In addition, in this system the refractive index is calculated by a diffraction tomography algorithm that accounts for the effects of diffraction in the 3-D reconstruction. We use the instrument to quantitatively monitor rapid changes in refractive index within defined subregions of cells due to exposure to acetic acid or changes in medium osmolarity. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). (DOI: 10.1117/1.3522506)
Pulsing the Probe Wave to Reduce Nonlocal Effects in Brillouin Optical Time-Domain Analysis (BOTDA) Sensors (2010)

We propose a simple technique that is able to mitigate nonlocal effects in Brillouin optical time domain analysis (BOTDA) sensors. The technique consists in pulsing the probe wave, so that the Brillouin interaction only takes place in a portion of the fiber. A shorter interaction length reduces the nonlocal effects induced by pump depletion. The portion of fiber investigated each time can be easily scanned along the whole fiber length, so that the complete Brillouin frequency shift distribution can be retrieved by successive measurements.
Detecting Edges in Images by Use of Fuzzy Reasoning (2003)

A method of processing digital image data to detect edges includes the use of fuzzy reasoning. The method is completely adaptive and does not require any advance knowledge of an image. During initial processing of image data at a low level of abstraction, the nature of the data is indeterminate. Fuzzy reasoning is used in the present method because it affords an ability to construct useful abstractions from approximate, incomplete, and otherwise imperfect sets of data. Humans are able to make some sense of even unfamiliar objects that have imperfect high-level representations. It appears that to perceive unfamiliar objects or to perceive familiar objects in imperfect images, humans apply heuristic algorithms to understand the images
A delay-locked frequency synthesizer with low phase noise performance (2004)

This paper presents a delay-locked frequency synthesizer implemented in 0.18 /spl mu/m CMOS technology. Symmetrical structures were employed in the circuit to reduce the inter-period jitter and phase noise. With the reference signal from an RF generator, the measured phase noise performance is of -105.5 dBc/Hz at 10 kHz offset with the carrier frequency of 2.07 GHz.
Characterisation of the RANTES/MIP‐1α receptor (CC CKR‐1) stably transfected in HEK 293 cells and the recombinant ligands (1995)

The CC chemokines RANTES and MIP-1 alpha are known to activate certain leucocytes and leucocytic cell lines. We have produced and fully characterised the recombinant proteins expressed in E. coli. They induce chemotaxis of the pro-monocytic cell line, THP-1 and T cells. THP-1 cells express three of the known CC chemokine receptors. In order to study the activation of a single receptor, we have expressed the shared receptor (CC CKR-1) for RANTES and MIP-1 alpha stably in the HEK 293 cell line. We have examined the effects of RANTES and MIP-1 alpha on the CC CKR-1 transfectants by equilibrium binding studies and in a chemotaxis assay. RANTES competes for [125I]RANTES with an IC50 of 0.6 +/- 0.23 nM, whereas MIP-1 alpha competes for its radiolabelled counterpart with an IC50 of 10 +/- 1.6 nM in the transfectants. These affinities are the same as those measured on the THP-1 cell line. The stably transfected HEK 293 cells respond to both these chemokines in the chemotaxis assay with the same EC50 values as those measured for THP-1 cells. This indicates that this cellular response can be mediated through the CC CKR-1 receptor.
Knockdown of proteins involved in iron metabolism limits tick reproduction and development (2009)

Ticks are among the most important vectors of a wide range of human and animal diseases. During blood feeding, ticks are exposed to an enormous amount of free iron that must be appropriately used and detoxified. However, the mechanism of iron metabolism in ticks is poorly understood. Here, we show that ticks possess a complex system that efficiently utilizes, stores and transports non-heme iron within the tick body. We have characterized a new secreted ferritin (FER2) and an iron regulatory protein (IRP1) from the sheep tick, Ixodes ricinus, and have demonstrated their relationship to a previously described tick intracellular ferritin (FER1). By using RNA interference-mediated gene silencing in the tick, we show that synthesis of FER1, but not of FER2, is subject to IRP1-mediated translational control. Further, we find that depletion of FER2 from the tick plasma leads to a loss of FER1 expression in the salivary glands and ovaries that normally follows blood ingestion. We therefore suggest that secreted FER2 functions as the primary transporter of non-heme iron between the tick gut and the peripheral tissues. Silencing of the fer1, fer2, and irp1 genes by RNAi has an adverse impact on hatching rate and decreases postbloodmeal weight in tick females. Importantly, knockdown of fer2 dramatically impairs the ability of ticks to feed, thus making FER2 a promising candidate for development of an efficient anti-tick vaccine.
Position and constraint force control of a vehicle with two or more steerable drive wheels (1993)

Since a vehicle with two or more steerable drive wheels is always traveling in a circle about an instantaneous center of rotation, the motion of the wheels is constrained. The wheel translational velocity divided by the radius to the center of rotation must be the same for all wheels. When the drive wheels are controlled independently using position control, the motion of the wheels may violate the constraints and the wheels may slip. Consequently, substantial errors can occur in the position and orientation of the vehicle. A vehicle with N steerable drive wheels has N holonomic constraints on the steering angles, (N-1) nonholonomic constraints on the wheel velocities, and one degree of freedom. The authors have developed a new approach to the control of a vehicle with N steerable drive wheels. The novel aspect of their approach is the introduction of variables to control the constraint forces. To control the vehicle, the authors have one variable to control motion and (N-1) variables that can control the constraint forces to reduce errors. Kankaanranta and Koivo (1988) developed a control architecture that allows the control variables for force and position to be decoupled. In the work of Kankaaranta and Koivo the control variables for force are an exogenous input. The authors have made the central variables for force endogenous by defining them in terms of the errors in satisfying the nonholonomic constraints. The authors have applied the control architecture to the HERMIES-III robot and have measured a dramatic reduction in error (more than a factor of 20) compared to motions without constraint force control.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Lipoprotein Lipase S447X (2006)

Lipoprotein lipase (LPL) hydrolyzes triglycerides in the circulation and promotes the hepatic uptake of remnant lipoproteins. Since the gene was cloned in 1989, more than 100 LPL gene mutations have been identified, the majority of which cause loss of enzymatic function. In contrast to this, the naturally occurring LPL(S447X) variant is associated with increased lipolytic function and an anti-atherogenic lipid profile and can therefore be regarded as a gain-of-function mutation. This notion combined with the facts that 20% of the general population carries this prematurely truncated LPL and that it may protect against cardiovascular disease has led to extensive clinical and basic research into this frequent LPL mutant. It is only until recently that we begin to understand the molecular mechanisms that underlie the beneficial effects associated with LPL(S447X). This review summarizes the current literature on this interesting LPL variant.
Carrier and Phase Recovery Algorithms for QAM Constellations: Real-time Implementations (2013)

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text A. Bisplinghoff, C. R. S. Fludger, T. Kupfer, and B. Schmauss, "Carrier and Phase Recovery Algorithms for QAM Constellations: Real-time Implementations," in Advanced Photonics 2013, X. Liu, C. Lu, W. Shieh, J. Cartledge, S. Savory, and C. Xie, eds., OSA Technical Digest (online) (Optica Publishing Group, 2013), paper SPM4D.1. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
IN-LINE ULTRASONIC INVESTIGATION OF SPOT WELD QUALITY USING MULTI-TRANSDUCER SET-UP (2010)

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 P. Kustron, J. Kocimski, A. M. Chertov, S. Titov, M. Korzeniowski, A. Ambroziak, R. Gr. Maev; IN‐LINE ULTRASONIC INVESTIGATION OF SPOT WELD QUALITY USING MULTI‐TRANSDUCER SET‐UP. AIP Conference Proceedings 22 February 2010; 1211 (1): 1615–1622. https://doi.org/10.1063/1.3362261 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 ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search
Mechanisms and Kinetics of Living Radical Polymerization: Absolute Comparison of Theory and Experiment (2003)

Theories that have been proposed to describe the polymerization rates and polydispersities in living radical polymerization (LRP) were experimentally tested for main branches of LRP including nitroxide-mediated polymerization (NMP), atom transfer radical polymerization (ATRP), iodide-mediated polymerization, and reversible addition-fragmentation chain transfer (RAFT) polymerization. The theories were verified on an absolute scale in both the absence and presence of conventional initiation. The cause for the marked retardation in polymerization rate observed in a dithiobenzoate-mediated RAFT polymerization of styrene was eluciated.
Mach-Zehnder silicon modulator on bulk silicon substrate; toward DRAM optical interface (2010)

We present a Mach-Zehnder silicon modulator fabricated on a bulk silicon substrate featuring active length of 200 µm, modulation speed up to 5 Gb/s, power consumption of 2 pJ/bit, and extinction ratio of 10 dB.
Recent advances in quantum cryptography (1999)

We report a particular implementation of a quantum cryptographic device operating at 1540 nm wavelength and involving interference between phase-modulated sidebands produced by a pair of phase modulators in the transmitting and receiving modules. The principle of operation is described in terms of both classical and quantum optics. The method has been demonstrated experimentally using a strong- attenuated semiconductor laser diode. Single photon interference has been obtained with a fringe visibility greater than 90%, including that the system can be used for quantum key distribution.
Extremely efficient internal exciton dissociation through edge-states in layered 2D perovskites for high-efficiency optoelectronic devices (2017)

International audience
Optical flame detection using large-scale artificial neural networks (2006)

A model for intelligent hydrocarbon flame detection using artificial neural networks (ANN) with a large number of inputs is presented. Joint time-frequency analysis in the form of short-time Fourier transform was used for extracting the relevant features from infrared sensor signals. After appropriate scaling, this information was provided as an input for the ANN training algorithm based on conjugate-gradient (CG) descent method. A classification scheme with trained ANN connection weights was implemented on a digital signal processor for an industrial hydrocarbon flame detector.
A New High-T<sub>c</sub> Oxide Superconductor without a Rare Earth Element (1988)

We have discovered a new high- T c oxide superconductor of the Bi-Sr-Ca-Cu-O system without any rare earth element. The oxide BiSrCaCu 2 O x has T c of about 105 K, higher than that of YBa 2 Cu 3 O 7 by more than 10 K. In this oxide, the coexistence of Sr and Ca is necessary to obtain high T c .
Variable-rate, digitally-controlled metering device (1999)

During the past decade, there has been increasing interest in applying water and chemicals to crops based on
need or yield potential rather than applying uniformly to the entire field. While ground-driven variable-rate chemical
application equipment is now being used, most irrigation systems continue to apply nominally uniform water depths. Our
objective was to make variable-rate irrigation applications possible by developing a digitally controlled metering device.
The device consists of a reservoir that is alternately filled and emptied at a rate determined by a digital pulse from an
external source and requires pressurized sources of water and air. The flow rate can be altered by changing the cycle
duration and frequency, by changing air and water pressure, or by exchanging the reservoir with one of different volume.
Tests with prototypes indicate reproducible flow rates for a range of operating pressures and discharge cycle durations.
Various sprinklers or nozzles may be attached to the outlet if specific distribution patterns are desired. Additionally, the
metering device can be used in a wide variety of applications with a variety of fluids or gases for variable-rate flow or
injection of a fluid into either another fluid or gas.
Parallel Inverse Halftoning Via Look-Up Table (Lut) Partitioning (2009)

Look-Up Table (LUT) method for inverse halftoning is computation less, fast, and also yields goods results. It employs a single LUT that is stored in a ROM and contains pre-computed contone (gray level) values for inverse halftone operation. This paper proposes an algorithm that can perform parallel inverse halftone operation by partitioning the single LUT into N smaller Look-Up Tables (s-LUTs). Thereby, upto k (k≤N) pixels can be concurrently fetched from the halftone image, and their contone values can also be fetched concurrently from separate smaller Look-Up Tables (s-LUT). The parallelization increases the speed of inverse halftoning by upto k times while the total entries in all s-LUTs remains equal to the entries in the single LUT of the serial LUT method. Some degradation in image quality is possible due to pixel loss during parallel fetching. This is due to some contone values cannot be fetched in the same cycle because some other contone value is being fetched from the s-LUT. The complete implementation of the algorithm requires two CPLD devices for computational portion, external content addressable memories (CAM) and static RAMs to store s-LUTs.
Joint Time Domain Decoding and Equalization for Time Reversal-Space Time Block Coded Systems (2007)

We propose a practical adaptive equalizer structure for space-time block coded systems operating over frequency selective fading channels. Specifically, we develop a time domain block equalizer for time reversal-space time block coded transceivers, which eliminates the need for a separate decoding block requiring explicit channel estimation. The block equalizer length is also independent of the data block length, making it particularly suitable for short delay spread channels. We develop new normalized least mean square (NLMS) and recursive least squares (RLS) adaptive algorithms for this block structure. We use computer simulations to compare our new equalizer with an existing frequency domain equalizer. We show that our time domain equalizer requires far fewer equalizer taps, and our equalizer running the RLS algorithm outperforms in terms of both dynamic convergence behavior and symbol error rate performance. Using the flexibility of the new equalizer, we finally show that a frame structure evenly distributing the training among the blocks yields better performance for fast time-varying channels than frame structures that are constrained by frequency domain equalization.