gebhart/patrepeval huggingface dataset:
Topology and energetics of metal-encapsulating Si fullerenelike cage clusters (2002)

On the basis of a topological discussion as well as an ab initio calculation, we show that it is possible to construct a fullerenelike Si cage by doping a transition metal atom in the cage center. The cage is a simple 3-polytope which maximizes the number of its inner diagonals close to the metal atom. Our topological argument also reveals how closely the structure of the fullerenelike Si cages studied is related to that of fullerenes themselves.
Compressive sampling strategies for integrated microspectrometers (2006)

We consider compressive sensing in the context of optical spectroscopy. With compressive sensing, the ratio between the number of measurements and the number of estimated values is less than one, without compromising the fidelity in estimation. A compressive sensing system is composed of a measurement subsystem that maps a signal to digital data and an inference algorithm that maps the data to a signal estimate. The inference algorithm exploits both the information captured in the measurement and certain <i>a priori</i> information about the signals of interest, while the measurement subsystem provides complementary, signal-specific information at the lowest sampling rate possible. Codesign of the measurement strategies, the model of <i>a priori</i> information, and the inference algorithm is the central problem of system design. This paper describes measurement constraints specific to optical spectrometers, inference models based on physical or statistical characteristics of the signals, as well as linear and nonlinear reconstruction algorithms. We compare the fidelity of sampling and inference strategies over a family of spectral signals.
Oxidative polymerization of 2,6‐bis(3‐methyl‐2‐butenyl)phenol (1981)

Abstract Oxidative polymerization of 2,6‐bis(3‐methyl‐2‐butenyl)phenol ( 1 ) was carried out by copperpyridine catalyst. 1 was oxidatively polymerized to yield poly[oxy‐2,6‐bis(3‐methyl‐2‐butenyl)‐1,4‐phenylene] ( 2 ) in a similar manner as it has been observed for 2,6‐dimethylphenol ( 3a ). 2 is an oily material with a degree of polymerization of 6,2. 1 and 3a copolymerized with similar reactivity to form the copolymer 4 (degree of polymerization 16 to 29). The 3‐methyl‐2‐butenyl groups in the polymer show enough chemical reactivity for an addition of bromine or graft‐polymerization.
Performance characteristics of a new 3-dimensional continuous-emission and spiral-transmission high-sensitivity and high-resolution PET camera evaluated with the NEMA NU 2-2001 standard. (2006)

The new integrated SET-3000 G/X PET scanner has good overall performance, including high resolution and sensitivity, and has the potential of reducing whole-body acquisition time to less than 10 min while improving small-lesion detectability with a low radiation dose.
459: Supplement -Use Among Prostate Cancer Survivors (2004)

You have accessJournal of UrologyDiscussed Poster, Sunday, May 9, 2004, 8:00 am - 12:00 pm1 Apr 2004459: Supplement -Use Among Prostate Cancer Survivors Jeremy Wiygul, Brian Evans, Bercedis Peterson, Thomas Polascik, Cary Robertson, Philip J. Walther, E. Everett Anderson, David F. Paulson, and Wendy Demark-Wahnefried Jeremy WiygulJeremy Wiygul More articles by this author , Brian EvansBrian Evans More articles by this author , Bercedis PetersonBercedis Peterson More articles by this author , Thomas PolascikThomas Polascik More articles by this author , Cary RobertsonCary Robertson More articles by this author , Philip J. WaltherPhilip J. Walther More articles by this author , E. Everett AndersonE. Everett Anderson More articles by this author , David F. PaulsonDavid F. Paulson More articles by this author , and Wendy Demark-WahnefriedWendy Demark-Wahnefried More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(18)37721-8AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail "459: Supplement -Use Among Prostate Cancer Survivors." The Journal of Urology, 171(4S), p. 122 © 2016 by American Urological AssociationFiguresReferencesRelatedDetails Volume 171Issue 4SApril 2004Page: 122 Advertisement Copyright & Permissions© 2016 by American Urological AssociationMetricsAuthor Information Jeremy Wiygul More articles by this author Brian Evans More articles by this author Bercedis Peterson More articles by this author Thomas Polascik More articles by this author Cary Robertson More articles by this author Philip J. Walther More articles by this author E. Everett Anderson More articles by this author David F. Paulson More articles by this author Wendy Demark-Wahnefried More articles by this author Expand All Advertisement PDF downloadLoading ...
Thermal Quenching of Ce3+ Luminescence in LaF3 and YF3 (2007)

Abstract not Available.
Performance Evaluation of Wideband Binary Identification of Grid Impedance Using Grid-connected Inverters (2019)

The application of the pseudo random binary sequence (PRBS) estimation technique for wideband grid impedance estimation using grid-connected inverters has gained more attention recently because of its several advantages. This includes its simple implementation in the control loop of the inverters and the small disturbance amplitude produced. In this context, this paper aims to evaluate the performance influences of the PRBS design parameters bit length, frequency resolution, and disturbance amplitude. This goal is achieved by exploring their effects on the grid impedance estimation accuracy and the produced total distortion (THD%+PRBS noise) of the inverter output current. A 3-phase balanced inverter system is simulated and investigated using MATLAB/Simulink based on a discrete-time model to show the trade-off of a real implementation such as the PRBS disturbance amplitude and the sampling frequency of the analog-to-digital converters. Simulation results show the trade-off between the investigated PRBS parameters and the accuracy and frequency range of the estimated grid impedance as well as the total distortion.
Nucleophilic attacks on LL (low LUMO) substrates. Part 3. Molecular stacking of 9-methylenefluorene derivatives as a source of zero-order reactions (1985)

The reactions of the three activated dibenzfulvene derivatives 9-dicyanomethylene-, 9-dinitromethylene-, and 9-nitromethylene-fluorene (FDCN, FDN, and FN respectively) with NaOH in water containing 1% dioxane were followed at 25 °C. The reactions were found to be zero-order in the substrate and zero-order within a run in the hydroxide. Overall, the reaction was first-order in the hydroxide. Under these conditions zero-order kinetics are also obtained for the reaction of CN– with FDCN. ‘Normal’ first-order kinetics were obtained under these conditions for the reaction of OH– with 1,1-diphenyl-2,2-dinitroethylene as well as for FDN when the dioxane concentration was increased to 25%(v/v). It is suggested that owing to their planar structure these substrates undergo efficient stacking in the solution with only a small fraction left as a free reactive monomer at the saturation concentration. A relatively rapid equilibrium between the monomer and the aggregate maintains a constant monomer concentration in the solution. A Tyndall effect of the aggregated particles could not be observed with the naked eye. The particles also pass through a Whatman No. 1 filter paper. However, other observations such as solvent and temperature effects on the absorbance in the u.v. range strongly support the suggested explanation.
Peer-to-Peer Urban Channel Characteristics for Two Public-Safety Frequency Bands (2014)

We report on peer-to-peer (ground-based) wireless channel characteristics for an urban environment in two public-safety bands. Results were based upon measurements taken in Denver in June 2009. The public-safety bands we investigated were the 700 MHz and 4.9 GHz bands, both planned for public-safety and “emergency-responder” applications. Heretofore, characterization of an urban environment in these bands has not been done. Specifically, an estimation of the distributions of both the number of multipath components and their delays has not been made for these bands, this environment, and our low antenna heights. Our measurements employed a vector network analyzer, from which both path loss and delay dispersion characteristics were obtained for link distances up to approximately 100 m. Log-distance models for path loss are presented, and dispersive channel models are also described. Our dispersive channel models employed a statistical algorithm for the number of multipath components, previously used only in indoor settings. By employing a transmitter-antenna positioner, we introduced spatial diversity into the measurement system, which enabled analysis of the dispersion characteristics of the angle of departure, also new for this ground-ground channel. The channel models should be useful for public-safety communication system designers.
Quasi-Z-source based bidirectional DC-DC converter and its control strategy (2019)

This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter (qZIBDC) for renewable energy applications. The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides, so the converter works as buck/boost converter from either side. It has a wider input/output voltage operating range, soft-switching capabilities without additional devices, and higher boost capability than a traditional dual active bridge circuit. Apart from that, shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter. Due to the symmetrical structure of the circuit, there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter. The operating principle and control strategy of the proposed converter are presented. Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy.
Degenerate four-wave mixing measurements of high order nonlinearities in semiconductors (1991)

Degenerate four-wave mixing experiments on ZnSe and CdTe semiconductor samples with picosecond laser pulses at wavelengths below the bandgap are described. The authors identify the dominant nonlinearities in ZnSe and CdTe. They determine these to be fast third-order nonlinearities, due to the same processes which give rise to the effects of bound-electronic refraction and two-photon absorption, while higher order effects are due to free-carrier refraction. Measurements of the absolute magnitude of the combined third order susceptibilities are described. Studies of higher order effects due to free-carrier gratings are discussed. To obtain a quantitative measurement of the carrier induced nonlinearities, an expression for the diffraction efficiency of these carrier gratings was developed, and a value for the free-carrier refractive index coefficient in ZnSe was found. By measuring the angular dependence of the grating decay, the carrier diffusion coefficient was determined as a function of carrier density.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>
Implantable telemetry capsule for monitoring arterial oxygen saturation and heartbeat (2008)

In this study, we have developed an implantable telemetry capsule for monitoring heartbeat. The capsule has three main functions, monitoring vital signs, transmitting the vital signs, and receiving energy for driving the capsule without wires. We used two wavelengths of LEDs and a photodiode sensitive to the two wavelengths for heartbeat sensor. The arterial oxygen saturation is calculated from the amplitude of the heartbeat signal. We fabricated an FM transmitter whose carrier frequency was 80 MHz. Though the GHz range frequency is generally used in transmission, the attenuation in the human body is large. The size of a common linear antenna is about a quarter of its operating wavelength. We employed a coil-based antenna which can reduce size below the quarter of the wavelength. We fabricated a miniaturized transmitter with the coil-based antenna at lower frequency. Our capsule was driven intermittently. We used a rechargeable battery. When the battery ran down, the battery was charged by wireless using the induced electromotive force. This means that the capsule is capable of monitoring vital signs over the long term. We measured the heartbeat from the middle finger of hand in a water tank as a model of a human body.
An active-head slider with a piezoelectric actuator for controlling flying height (2002)

The current design of magnetic-disk head sliders needs an extra margin of flying height for manufacturing tolerance or environmental variation. To reduce this margin, we have developed active-head sliders. These sliders carry an unimorph piezoelectric microactuator, and their flying height can be controlled. After simulating the piezoelectric deflection of the actuator and flying characteristics of air-bearing surfaces, we designed two types of active-head sliders (five-pad type and four-pad type) and fabricated them by silicon microelectromechanical system (MEMS) processing. In tests, the sliders flew over a glass disk, and the observed stroke of the actuator (30 nm/5 V) was considered large enough to control the flying height. The large area at the rear end of the four-pad-type slider structure is sufficient to carry conventional read/write heads. Moreover, the slider fabrication process will not destroy the heads. We, thus, conclude that the active-head sliders can be applied for practical use easily, and their flying height will be significantly lower than that of conventional disk head sliders.
Histone Deacetylase 3 Depletion in Osteo/Chondroprogenitor Cells Decreases Bone Density and Increases Marrow Fat (2010)

Histone deacetylase (Hdac)3 is a nuclear enzyme that contributes to epigenetic programming and is required for embryonic development. To determine the role of Hdac3 in bone formation, we crossed mice harboring loxP sites around exon 7 of Hdac3 with mice expressing Cre recombinase under the control of the osterix promoter. The resulting Hdac3 conditional knockout (CKO) mice were runted and had severe deficits in intramembranous and endochondral bone formation. Calvarial bones were significantly thinner and trabecular bone volume in the distal femur was decreased 75% in the Hdac3 CKO mice due to a substantial reduction in trabecular number. Hdac3-CKO mice had fewer osteoblasts and more bone marrow adipocytes as a proportion of tissue area than their wildtype or heterozygous littermates. Bone formation rates were depressed in both the cortical and trabecular regions of Hdac3 CKO femurs. Microarray analyses revealed that numerous developmental signaling pathways were affected by Hdac3-deficiency. Thus, Hdac3 depletion in osterix-expressing progenitor cells interferes with bone formation and promotes bone marrow adipocyte differentiation. These results demonstrate that Hdac3 inhibition is detrimental to skeletal health.
A new pyrrolyl‐quinoxalinedione series of non‐NMDA glutamate receptor antagonists: pharmacological characterization and comparison with NBQX and valproate in the kindling model of epilepsy (1999)

Antagonists at the ionotropic non-NMDA [AMPA (amino-methyl proprionic acid)/kainate] type of glutamate receptors have been suggested to possess several advantages compared to NMDA (N-methyl-D-aspartate) receptor antagonists, particularly in terms of risk/benefit ratio, but the non-NMDA receptor antagonists available so far have not fulfilled this promise. From a large series of pyrrolyl-quinoxalinedione derivatives, we selected six new competitive non-NMDA receptor antagonists. The basis of selection was high potency and selectivity for AMPA and/or kainate receptors, high in vivo potency after systemic administration, and an acceptable ratio between neuroprotective or anticonvulsant effects and adverse effects. Pharmacological characteristics of these novel compounds are described in this study with special emphasis on their effects in the kindling model of temporal lobe epilepsy, the most common type of epilepsy in humans. In most experiments, NBQX and the major antiepileptic drug valproate were used for comparison with the novel compounds. The novel non-NMDA receptor antagonists markedly differed in their AMPA and kainate receptor affinities from NBQX. Thus, while NBQX essentially did not bind to kainate receptors at relevant concentrations, several of the novel compounds exhibited affinity to rat brain kainate receptors or recombinant kainate receptor subtypes in addition to AMPA receptors. One compound, LU 97175, bound to native high affinity kainate receptors and rat GluR5-GluR7 subunits, i.e. low affinity kainate binding sites, with much higher affinities than to AMPA receptors. All compounds potently blocked AMPA-induced cell death in vitro and, except LU 97175, AMPA-induced convulsions in vivo. In the kindling model, compounds with a high affinity for GluR7 (LU 97175) or compounds (LU 115455, LU 136541) which potently bind to AMPA receptors and low affinity kainate receptor subunits were potent anticonvulsants in the kindling model, whereas the AMPA receptor-selective LU 112313 was the least selective compound in this model, indicating that non-NMDA antagonists acting at both AMPA and kainate receptors are more effective in this model than AMPA receptor-selective drugs. Three of the novel compounds, i.e. LU 97175, LU 115455 and LU 136541, exerted potent anticonvulsant effects without inducing motor impairment in the rotarod test. This combination of actions is thought to be a prerequisite for selective anticonvulsant drug action.
NONINTRUSIVE MEASUREMENT OF THE MASS FLOW RATE INSIDE A CLOSED LOOP TWO-PHASE THERMOSYPHON (2011)

Two-phase cooling is a promising technology for electronics cooling. It allows the use of dielectric fluids in passive systems and benefits from high heat transfer coefficients. Thermosyphons are a particularly interesting technology in the field of power electronics being entirely passive and simple equipment. Their performances are strongly related to the flow rate of the fluid inside the thermosyphon. In minichannel thermosyphons liquid entrainment occurs so that flow rate is difficult to evaluate, hence the need for a nonintrusive measurement method. For this purpose a minichannel thermosyphon was manufactured out of borosilicate glass and equipped with a semitransparent indium titanium oxide layer as a direct current heating evaporator. It was illuminated by two lasers through the glass tube and the voltage from two photodiodes placed on the opposite side was measured. With an appropriate signal processing the maximal velocity was determined together with length and frequency of the vapor bubbles, the frequency of the thermosyphon cycle for several filling ratios, and for various heating powers. From these measurements the total mass flow rate, the liquid mass flow rate, the gas mass flow rate, the void fraction, the vapor quality, and the flow cycle frequency were calculated and compared to a thermosyphon simulation model developed at ABB.
Advanced Device Isolation for Very Large Scale Integration (1985)

Device-isolation concepts and methods have changed over the years, each new approach typically requiring various elements of process development. The ultimate device isolation is one in which the devices can be separated from each other by a dielectric region that reaches down past the active device areas and occupies minimal real estate. The device elements in such a case could all be butted against the isolation region. This process, in principle, becomes lithography limited and is extendible with future lithography improvements. Device scaling is, therefore, assured. It also permits some process simplifications in comparison to current process technologies, such as fewer masks, elimination of lateral autodoping and Si3N4 films, as well as improved surface planarities. The process technologies required to achieve this form of device isolation (generally termed "trench isolation") relate mainly to reactive ion etching (RIE) and chemical vapor deposition (CVD) techniques. In both instances, extensions of current process capabilities and process understanding had to be developed in order to accommodate the various isolation requirements dictated by different device design configurations. Elements of these processes will be discussed, along with examples of associated process difficulties and accomplishments.
Toward a Tunable VUV Frequency Comb for 229mTh Nuclear Spectroscopy (2021)

We constructed a Yb:fiber frequency comb for the generation of a vacuum-ultraviolet frequency comb via 7th harmonic generation. The spectral coverage and the noise performance of this comb are tailored for probing the 229 m Th nuclear transition.
Analysis of the synaptic vesicle proteome using three gel‐based protein separation techniques (2006)

Synaptic vesicles are key organelles in neurotransmission. Their functions are governed by a unique set of integral and peripherally associated proteins. To obtain a complete protein inventory, we immunoisolated synaptic vesicles from rat brain to high purity and performed a gel-based analysis of the synaptic vesicle proteome. Since the high hydrophobicity of integral membrane proteins hampers their resolution by gel electrophoretic techniques, we applied in parallel three different gel electrophoretic methods for protein separation prior to MS. Synaptic vesicle proteins were subjected to either 1-D SDS-PAGE along with nano-LC ESI-MS/MS or to the 2-D gel electrophoretic techniques benzyldimethyl-n-hexadecylammonium chloride (BAC)/SDS-PAGE, and double SDS (dSDS)-PAGE in combination with MALDI-TOF-MS. We demonstrate that the combination of all three methods provides a comprehensive survey of the proteinaceous inventory of the synaptic vesicle membrane compartment. The identified synaptic vesicle proteins include transporters, soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs), synapsins, rab and rab-interacting proteins, additional guanine nucleotide triphosphate (GTP) binding proteins, cytoskeletal proteins, and proteins modulating synaptic vesicle exo- and endocytosis. In addition, we identified novel proteins of unknown function. Our results demonstrate that the parallel application of three different gel-based approaches in combination with mass spectrometry permits a comprehensive analysis of the synaptic vesicle proteome that is considerably more complex than previously anticipated.
Tune-All RF Planar Duplexers With Intrinsically Switched Channels (2017)

A class of frequency-agile planar duplexers with independently controllable channels in terms of center frequency, passband-width, out-of-band power-attenuation characteristics, and tune-all transfer-function capabilities is reported. Each channel filter is made up of frequency-reconfigurable resonators that are coupled to its direct input-to-output electrical path through static impedance inverters and generate power transmission zeros (TZs). Thus, the duplexer channels are exclusively reconfigured by means of dynamic TZ allocation. Furthermore, the channel filters can be intrinsically switched-OFF by incorporating a bandstop-filtering function into them. The operational principles of this spectrally adaptive duplexer concept are expounded and experimentally demonstrated through the manufacturing and characterization of a microstrip prototype in the UHF range.
Dielectric elastomer actuators with elastomeric electrodes (2012)

For many applications of dielectric elastomer actuators, it is desirable to replace the carbon-grease electrodes with stretchable, solid-state electrodes. Here, we attach thin layers of a conducting silicone elastomer to prestrained films of an acrylic dielectric elastomer and achieve voltage-actuated areal strains over 70%. The influence of the stiffness of the electrodes and the prestrain of the dielectric films is studied experimentally and theoretically.