gebhart/patrepeval huggingface dataset:
High-efficiency three-way Ka-band waveguide unequal power combiner (2012)

This article presents the design, simulation and characterisation of a novel high-efficiency Ka-band (32.05±0.25 GHz) rectangular waveguide three-way serial combiner for monolithic microwave integrated circuit power amplifiers (PAs) with unequal output power. The combiner presented here is suited for low data rate communications from deep space using a single carrier with constant envelope (amplitude) type modulation. The three-way combiner consists internally of two branch-line hybrids connected in series by a short length of waveguide. The two branch-line hybrids were each designed to combine two input signals that are equal in phase and with an amplitude ratio of two, although in general the amplitude ratio could be arbitrary. The combiner was fabricated in an E-plane split-block arrangement and precision machined from blocks of aluminium with standard WR-28 waveguide ports. S-parameter measurements demonstrated a close achievement of the design goals. The measured return loss at the output port was greater than 16 dB and the isolation between the three input ports of the three-way combiner were greater than 22 dB. The combining of three PAs was successfully demonstrated in which the measured combining efficiency was greater than 90% at the centre frequency of 32.05 GHz.
Personalization of a compartmental physiological model for an artificial pancreas through integration of patient's state estimation (2017)

Artificial Pancreas (AP) are developed for patients with Type 1 diabetes. This medical device system consists in the association of a subcutaneous continuous glucose monitor (CGM) providing a proxy of the patient's glycaemia and a control algorithm offering the real-time modification of the insulin delivery with an automatic command of the subcutaneous insulin pump. The most complex algorithms are based on a compartmental model of the glucoregulatory system of the patient coupled to an approach of MPC (Model-Predictive-Control) for the command. The automatic and unsupervised control of insulin regulation constitutes a major challenge in AP projects. A given model with its parameterization on the shelf will not directly represent the patient's data behavior and the personalization of the model is a prerequisite before using it in a MPC. The present paper focuses on the personalization of a compartmental showing a method where taking into account the estimation of the patient's state in addition to the parameter estimation improves the results in terms of mean quadratic error.
Dodecamethyl-<i>closo</i>-dodecaborate(2−) (2001)

Bis(tetraethylammonium) dodecamethyl-closo-dodecaborate(2-), [NEt(4)](2)[closo-B(12)Me(12)], [NEt(4)](2)2, was prepared employing modified Friedel-Crafts reaction conditions from [NEt(4)](2)[closo-B(12)H(12)], [NEt(4)](2)1, trimethylaluminum, and methyl iodide. The [NEt(4)](2)2 salt provides sufficient solubility in water to allow the synthesis of the important alkali metal salts A(2)2 (A = Li, Na, K, Rb, Cs) using cation-exchange procedures. The solid state structure of colorless [AsPh(4)](2)2 reveals a nearly perfect icosahedral B(12) cluster with B-B bonds ranging from 1.785(3) to 1.807(3) A and B-C bonds of 1.597(3)-1.625(3) A. In contrast, the crystal structure of dark-red [Py(2)CH(2)]2 (obtained from [NEt(4)](2)2 and [Py(2)CH(2)]Br(2)) contains a distorted icosahedral dianion [B-B = 1.740(13)-1.811(14) A, B-C = 1.591(13)-1.704(13) A]. In the [Py(2)CH(2)]2 salt, the dianion 2(2-) and its dipositive dipyridiniomethane counterion form a red charge-transfer complex. One-electron oxidation of 2(2)(-) by ceric(IV) ammonium nitrate affords the blue, air-stable radical [hypercloso-B(12)Me(12)](*-), dodecamethyl-hypercloso-dodecaborate(1-), 2(*-), isolated as the PPN salt. X-ray crystallography reveals that the geometries of the B(12) clusters observed in hypercloso-[PPN]2 and closo-[AsPh(4)](2)2 are identical and essentially undistorted icosahedra. The anion in the [PPN]2 structure contains B-B bonds ranging from 1.784(8) to 1.806(7) A and a range of B-C bonds from 1.596(7) to 1.616(7) A.
Dynamics and Control of a Biomimetic Vehicle Using Biased Wingbeat Forcing Functions (2010)

A wingbeat forcing function and control method are presented that allow six-degree-of-freedom control of a flapping-wing micro air vehicle using only two actuators, each of which independently actuate a wing. Split-cycle constant-period frequency modulation with wing bias is used to produce nonzero cycle-averaged drag. The wing bias provides pitching-moment control and, when coupled with split-cycle constant-period frequency modulation, requires only independently actuated wings to enable six-degree-of-freedom flight. Wing bias shifts the cycle-averaged center-of-pressure locations of the wings, thus providing the ability to pitch the vehicle. Implementation of the wing bias is discussed, and modifications to the wingbeat forcing function are made to maintain wing position continuity. Instantaneous and cycle-averaged forces and moments are computed, cycle-averaged control derivatives are calculated, and a controller is developed. The controller is designed using a simplified aerodynamic model derived with blade-element theory and cycle averaging. The controller is tested using a simulation that includes blade-element-based estimates of the instantaneous aerodynamic forces and moments that are generated by the combined motion of the rigid-body fuselage and the flapping wings. Simulations using this higher-fidelity model indicate that the cycle-averaged blade-element-based controller is capable of achieving controlled flight.
Glyceollins, a Novel Class of Antiestrogenic Phytoalexins (2010)

Glyceollins, a group of novel phytoalexins isolated from activated soy, have demonstrated unique in vitro and in vivo antiestrogenic activity. The soybean plant under stress produces a mixture of glyceollins I, II, and III that bind to the estrogen receptor (ER) and inhibit estrogen-induced tumor progression. In further in vitro studies, the glyceollin mixture exhibits potential antiestrogenic, therapeutic activity preventing estrogen-stimulated tumorigenesis and displaying a differential pattern of gene expression from tamoxifen. By isolating the individual glyceollin isomers, we identified the active antiestrogenic component using competition binding assays with human ER a and estrogen-responsive element-based luciferase reporter assays. We identified glyceollin I as the active antiestrogenic component of the mixture. Ligand-receptor modeling (docking) of the isomers within the ER a ligand binding cavity demonstrated a unique type II antiestrogenic confirmation adopted by glyceollin I, but not isomers II and III. Glyceollin I treatment in 17 β - estradiol-stimulated MCF-7 breast cancer cells and BG-1 ovarian cancer cells resulted in a novel inhibition of ER-mediated gene expression and cell proliferation/ survival. Glyceollin I may represent an important component of a phytoalexin-enriched food (activated) diet in terms of chemoprevention as well as a novel therapeutic agent for hormone dependent tumors .
A Mathematical Formulation for 3D Quasi-Static Multibody Models of Diarthrodial Joints (2000)

This study describes a general set of equations for quasi-static analysis of three-dimensional multibody systems, with a particular emphasis on modeling of diarthrodial joints. The model includes articular contact, muscle forces, tendons and tendon pulleys, ligaments, and the wrapping of soft tissue structures around bone and cartilage surfaces. The general set of equations governing this problem are derived using a consistent notation for all types of links, which can be converted conveniently into efficient computer codes. The computational efficiency of the model is enhanced by the use of analytical Jacobians, particularly in the analysis of articular surface contact and wrapping of soft tissue structures around bone and cartilage surfaces. The usefulness of the multibody model is demonstrated by modeling the patellofemoral joint of six cadaver knees, using cadaver-specific data for the articular surface and bone geometries, as well as tendon and ligament insertions and muscle lines of actions. Good accuracy was observed when comparing the model patellar kinematic predictions to experimental data (mean +/- stand. dev. error in translation: 0.63 +/- 1.19 mm, 0.10 +/- 0.71 mm, -0.29 +/- 0.84 mm along medial, proximal, and anterior directions, respectively; in rotation: -1.41 +/- 1.71 degrees, 0.27 +/- 2.38 degrees, -1.13 +/- 1.83 degrees in flexion, tilt and rotation, respectively). The accuracy which can be achieved with this type of model, and the computational efficiency of the algorithm employed in this study may serve in many applications such as computer-aided surgical planning, and real-time computer-assisted surgery in the operating room.
Submillimeter-wave active radar imager (2007)

The authors have developed and demonstrated 3D imaging using a submillimeter-wave FMCW radar with a fast microwave chirp and phase coherent detection. The technique provides an important advantage over more traditional CW RF imaging in that time gating of the return signals allows optimization of the received scene illumination or specific depth reconstruction. This can be used to enhance (or hide) specific objects or greatly reduce background clutter. The system was initially prototyped with available RF components near 600 GHz and a 12.6 GHz chirp producing a 250 MHz/msec sweep yielding a range resolution of 1.2 cm. Lateral resolution on the scene is set by a 20 cm diameter Teflon lens antenna producing approximately 2 cm at 4 m distance. The RF transmit power (generated by a W-band power amplifier and an in-house frequency multiplier chain) is less than 0.5 mW but when coupled with a heterodyne downconverter (in-house developed fundamental balanced Schottky diode mixer, 4000 K DSB noise temperature) yields a measured dynamic range of more than 70 dB. A more compact and higher resolution system is currently under construction and will employ an 18 GHz msec sweep rate microwave chirp for sub-cm range resolution, a 40 cm reflector and a higher power transmitter, dramatically increasing resolution and dynamic range. The talk will cover the system design and some early results we have obtained on test targets at 4 m.
Fast decoding of polar codes using tree structure (2019)

In this study, the authors first propose a tree structure for the successive cancelation (SC) decoding of polar codes. The proposed structure is easy to implement in hardware and suitable for parallel processing operations. Next, using the proposed tree structure, they propose a technique for the fast decoding of polar codes. With the proposed method, it is possible to decode all the information bits simultaneously at the same time, i.e. in parallel. Lastly, they introduce an improved version of the proposed high‐speed decoding algorithm. The proposed high‐speed decoding approach and its improved version are simulated on the computer environment and their bit error rate performances are compared to the performance of the classical SC method.
Congestion Avoidance in Computer Networks with a Connectionless Network Layer (1998)

Widespread use of computer networks and the use of varied technology for the interconnection of computers has made congestion a significant problem. In this report, we summarize our research on congestion avoidance. We compare the concept of congestion avoidance with that of congestion control. Briefly, congestion control is a recovery mechanism, while congestion avoidance is a prevention mechanism. A congestion control scheme helps the network to recover from the congestion state while a congestion avoidance scheme allows a network to operate in the region of low delay and high throughput with minimal queuing, thereby preventing it from entering the congested state in which packets are lost due to buffer shortage. A number of possible alternatives for congestion avoidance were identified. From these alternatives we selected one called the binary feedback scheme in which the network uses a single bit in the network layer header to feed back the congestion information to its users, which then increase or decrease their load to make optimal use of the resources. The concept of global optimality in a distributed system is defined in terms of efficiency and fairness such that they can be independently quantified and apply to any number of resources and users. The proposed scheme has been simulated and shown to be globally efficient, fair, responsive, convergent, robust, distributed, and configuration-independent.
Network access and synchronization procedures for a CDMA satellite communication system (2003)

This paper provides the network access and synchronization procedures of an orthogonal CDMA geostationary satellite system for fixed service communications. These procedures include, initial synchronization, access channel acquisition and fine synchronization control. We also describe the system architecture and provide the performance evaluation. The main objective is to provide network wide synchronization of all uplink orthogonal CDMA transmissions. This is achieved in steps; first by providing coarse synchronization using the uplink random access channel and then fine sync using innovative tracking control mechanisms. The uplink access channel receiver utilize a parallel/serial search method for rapid code acquisition, while the code tracking of the uplink orthogonal CDMA traffic channel is based on a delay feedback early-late gate in which the sych control resides in the receiver. The proposed system is designed to minimize the onboard complexity and satisfy the performance requirements. As shown in the performance section, the requirement that all uplink transmissions are synchronized to a reference time within 10% of the chip length can be achieved. In addition, the system analysis determines the design parameters values which optimize performance.
STABILITY OF IODINE-DOPED POLYACETYLENE IN AQUEOUS ENVIRONMENTS (1983)

Iodine-doped polyacetylene has been found to display exceptional stability in deaerated, aqueous environments and to degrade in the presence of aqueous nucleophiles with a rate which increases with increasing nucleophilicity.
Magneto-Optical Recording in Co/Pt Multilayers (1989)

In this paper the magnetic and magneto-optical properties as well as the recording performance of Co/Pt layered structures are described. Two different structures are investigated: One with 4 Å Co and 9 Å Pt layers and the other with 4 Å Co and 18 Å thick Pt layers. We show with Lorentz microscopy that very regular domains can be written in these layers and we relate these results to the measured recording performance. Domain patterns are written in two different ways, with laser modulation (LM) and magnetic field modulation (MFM). With LM very regularly shaped domains are formed. With MFM we find a strong tendency for subdomain formation.
Adaptive Injection-locking Oscillator Array for RF Spectrum Analysis (2011)

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 Daniel Leung; Adaptive Injection‐locking Oscillator Array for RF Spectrum Analysis. AIP Conf. Proc. 19 April 2011; 1339 (1): 36–43. https://doi.org/10.1063/1.3574842 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
A new self-routing switch driven with input-to-output address difference (1991)

A self-routing switch for fast packet switching is proposed. The routing method uses the difference between the input and output addresses as a routing header value. Every information block with a routing header is easily routed to its destination line with no congestion in the switch. It is suitable for VLSI technology: a throughput of 1.6 Gb/s for a 16*16 switch is possible in a chip using CMOS technology. The switch consists of multistage circulated shift registers and output buffers. Multipoint connection can also be provided without additional complex hardware. The routing algorithm, mechanism, and applications of the switch are presented. >
Molecular characterization of the clumping factor (fibrinogen receptor) of <i>Staphylococcus aureus</i> (1994)

Four mutants of Staphylococcus aureus strain Newman that were defective in the fibrinogen receptor (clumping factor) were isolated by transposon Tn917 mutagenesis. Southern hybridization analysis of the mutants identified transposon-host DNA junction fragments, one of which was cloned and used to generate a probe to identify and clone the wild-type clumping factor locus (clfA). The mutants failed to form clumps in soluble fibrinogen and adhered poorly to polymethylmethacrylate (PMMA) coverslips coated with fibrinogen. A single copy of the clfA gene, when introduced into the chromosome of the mutant strains, fully complemented the clumping deficiency of these strains and restored the ability of these mutants to adhere to fibrinogen-coated PMMA. In addition, the cloned clfA gene on a shuttle plasmid allowed the weakly clumping strain 8325-4 to form clumps with the same avidity as the wild-type strain Newman and also significantly enhanced the adherence of 8325-4 strains. Thus the formation of clumps in soluble fibrinogen correlated with adherence of bacteria to solid-phase fibrinogen. The clfA gene encodes a fibrinogen-binding protein with an apparent molecular mass of c. 130 kDa. The amino acid sequence of the protein was deduced from the DNA sequence; it was predicted that a 896 residue protein (molecular mass 92 kDa) would be expressed. The putative ClfA protein has features that suggest that it is associated with the cell surface. Furthermore it contains a novel 308 residue region comprising dipeptide repeats predominantly of Asp and Ser ending 28 residues upstream from the LPXTG motif common to wall-associated proteins. Significant homology was found between the ClfA protein and the fibronectin-binding proteins of S. aureus, particularly in the N- and C-termini.
Characterization of a Region Upstream of Exon I.1 of the Human CYP19 (Aromatase) Gene That Mediates Regulation by Retinoids in Human Choriocarcinoma Cells (1998)

The biosynthesis of estrogens is catalyzed by aromatase P450 (P450arom), the product of the CYP19 gene. The tissue-specific expression of the CYP19 gene is regulated by means of tissue-specific promoters through the use of alternative splicing mechanisms. Thus, transcripts containing various 5'-untranslated termini are present in ovary, brain, adipose stromal cells, and placenta. Sequence corresponding to untranslated exon I.1 is present uniquely in 5'-termini of transcripts expressed in human placenta and choriocarcinoma cells, as a consequence of expression driven by a distal promoter, I.1. The goal of the present study was the identification of regulatory elements in this promoter region. Various deletion mutations of the upstream flanking region of exon I.1 were constructed using the PCR or restriction enzyme digestion. The genomic fragments were fused upstream of the luciferase reporter gene. These constructs were transfected into human choriocarcinoma (JEG3) cells. The longest construct employed, -924/+10 bp, expressed the highest luciferase reporter gene activity. The -64/+10 bp and -125/+10 bp constructs showed no reporter gene expression. Transfection of the -201/+10 bp construct resulted in reporter gene expression, but at a lower level than that of the -924/+10 bp construct, and this expression was induced by serum as well as by LG69 and TTNPB, ligands specific for RXR and RAR respectively, as well as by vitamin D. These results parallel the actions of the ligands on aromatase activity. Mutation or deletion of an imperfect palindromic sequence (AGGTCATGCCCC) located at -183 to -172 bp upstream of the transcriptional start site of exon I.1 resulted in loss of basal- and retinoid-induced reporter gene expression. Gel retardation analysis using nuclear extracts of JEG3 cells treated with retinoids and the imperfect palindromic sequence as probe, showed that proteins present in the nuclear extracts bound to this sequence in a specific fashion. The binding activities were elevated by incubation of the cells with LG69 and TTNPB, ligands specific for RXR and RAR respectively. Binding of nuclear proteins to the palindromic sequence was displaced either by anti-RXR alpha serum or by anti-VDR serum, suggesting the formation of a heterodimer of RXR alpha and VDR. These results suggest that the imperfect palindromic sequence upstream of exon I.1 plays an important but novel role in the regulated expression of the CYP19 gene in choriocarcinoma cells.
Magnetoresistance measurement of unpatterned magnetic tunnel junction wafers by current-in-plane tunneling (2003)

We demonstrate a method for measuring magnetoresistance (MR) and resistance area product (RA) of unpatterned magnetic tunnel junction film stacks. The RA is measured by making a series of four point probe resistance measurements on the surface of an unpatterned wafer at various probe spacings. The key to this technique is in placing the probes at the appropriate spacings, on the order of microns for typical applications. The MR is obtained by repeating the measurement at different magnetic fields. A simple conceptual model and an exact analytical solution in good agreement with experimental data are presented. The current-in-plane tunneling method requires no processing, is fast, and provides reliable data which are reflective of the deposition only.
A portable Arc-Microwave Hybrid Plasma Torch Module (2006)

Development of a plasma torch, which carries desirable features for being an ignition aide within a supersonic-combustor, is studied. The desirable features include 1) a microwave adaptor arrangement to couple additional power (from microwave as well as arc discharge) to the plasma torch; 2) an additional port for fuel injection; and 3) compact (including the power supply), portable, and light weight. The plasma jet generated by this torch is described by the cycle energy of the discharge and through imaging of its plume under various conditions, the supply air pressure and microwave (on or off) to the torch. This torch system, with its high voltage discharge, is operated in periodic (60-Hz) mode. The capacitors in the circuit of the power supply are charged at the line frequency of 60 Hz, resulting in a cyclical discharge. The cycle energy is up to 12 J. The microwave electric field has a profound effect on the arc discharge. It intensifies the emission and increases the volume of the arc loop region. It also enhances the electron temperature significantly as shown by the emission spectroscopy of the torch. The spatial distribution of the microwave electric field outside the nozzle of the torch module is not affected by the supersonic cross flow, a favorable feature for increasing the penetration depth of torch plume into the supersonic crossflow in the combustor.