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21:44 EDT 24th March 2018 | BioPortfolio

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Showing "Relay Life something everybody Norwalk Reflector" PubMed Articles 1–25 of 8,800+

Terrestrial Laser Scanner Two-Face Measurements for Analyzing the Elevation-Dependent Deformation of the Onsala Space Observatory 20-m Radio Telescope's Main Reflector in a Bundle Adjustment.

For accurate astronomic and geodetic observations based on radio telescopes, the elevation-dependent deformation of the radio telescopes' main reflectors should be known. Terrestrial laser scanning has been used for determining the corresponding changes of focal lengths and areal reflector deformations at several occasions before. New in this publication is the situation in which we minimize systematic measurement errors by an improved measurement and data-processing concept: Sampling the main reflector in ...

Narrowband silicon waveguide Bragg reflector achieved by highly ordered graphene oxide gratings.

Graphene oxide (GO) ultrathin film can be wafer-scale deposited by spin coating, can be patterned by laser interference lithography and oxygen plasma etching, can be thinned atomically (0.26 nm/min) and oxidized by ozone treatment, and is a relatively transparent and low-refractive-index material compared to pristine graphene. All those unique properties prompt us to realize a low-loss (∼5  dB/cm), high-extinction-ratio (19 dB), and narrowband (0.425 nm) GO/silicon hybrid waveguide Bragg reflector ...

Reconfigurable Yagi-Uda antenna based on a silicon reflector with a solid-state plasma.

This paper describes the fabrication and characterization of a reconfigurable Yagi-Uda antenna based on a silicon reflector with a solid-state plasma. The silicon reflector, composed of serially connected p-i-n diodes, forms a highly dense solid-state plasma by injecting electrons and holes into the intrinsic region. When this plasma silicon reflector is turned on, the front-realized gain of the antenna increases by more than 2 dBi beyond 5.3 GHz. To achieve the large gain increment, the structure of the ...

Topological Interference Management for K-User Downlink Massive MIMO Relay Network Channel.

In this paper, we study the emergence of topological interference alignment and the characterizing features of a multi-user broadcast interference relay channel. We propose an alternative transmission strategy named the relay space-time interference alignment (R-STIA) technique, in which a K -user multiple-input-multiple-output (MIMO) interference channel has massive antennas at the transmitter and relay. Severe interference from unknown transmitters affects the downlink relay network channel and degrades t...

Radical Redox-Relay Catalysis: Formal 3+2 Cycloaddition of N-Acylaziridines and Alkenes.

We report Ti-catalyzed radical formal [3+2] cycloadditions of N-acylaziridines and alkenes. This method provides an efficient approach to the synthesis of pyrrolidines-structural units prevalent in bioactive compounds and organocatalysts-from readily available starting materials. The overall redox-neutral reaction was achieved via a redox-relay mechanism, which harnesses radical intermediates for selective C-N bond cleavage and formation.

Analysis of channel uncertainty in ARQ relay networks.

Several power allocation algorithms for cooperative relay networks are presented in the literature. These contributions assume perfect channel knowledge and capacity achieving codes. However in practice, obtaining the channel state information at a relay or at the destination is an estimation problem and can generally not be error free. The investigation of the power allocation mechanism in a wireless network due to channel imperfections is important because it can severely degrade its performance regarding...

Regio and Stereoselective Heck-Matsuda Arylations of Trisubstituted Allylic Alkenols and their Silyl and Methyl Ether Derivatives to Access Two Contiguous Stereogenic Centers: Expanding the Redox-Relay Process and Application in the Total Synthesis of meso-Hexestrol.

Novel palladium-catalyzed redox-relay Heck arylation reactions of trisubstituted allylic alkenols were developed employing silyl and methyl ethers. The reactions proceeded under mild conditions in moderate to high yields in excellent anti diastereoselectivity to form α,β- disubstituted methyl ketones containing two contiguous stereocenters. The new redox-relay arylations using silyl and methyl ethers of the starting alkenols demonstrates that the presence of a free hydroxyl group is not a sine qua non con...

Diastereo- and Enantioselective Formal 3+2 Cycloaddition of Cyclopropyl Ketones and Alkenes via Ti-catalyzed Radical Redox Relay.

We report a stereoselective [3+2] cycloaddition of cyclopropyl ketones and radical-acceptor alkenes to form polysubstituted cyclopentane derivatives. Catalyzed by a chiral Ti(salen) complex, the cycloaddition occurs via a radical redox-relay mechanism and constructs two C-C bonds and two contiguous stereogenic centers with generally excellent diastereo- and enantioselectivity.

Bisannulation of Benzamides and Cyclohexadienone-Tethered Allenes Triggered by Cp*Rh(III)-Catalyzed C-H Activation and Relay Ene Reaction.

The diastereoselective bisannulation of N-(pivaloyloxy)benzamides and cyclohexadienone-tethered allenes was accomplished through Cp*Rh(III)-catalyzed C-H activation and relay ene reaction, providing a 3-isoquinolonyl cis-hydrobenzofuran framework with high yields and diastereoselectivities. This reaction tolerates a wide range of functional groups, enabling further conversions to tricyclic and bridged-ring structures. Moreover, the dearomatization modification of phenol-contained bioactive molecule is also ...

Field imaging near to the surface of terahertz reflective optics using a vector network analyzer.

A vector network analyzer-based quasi-optical measurement system that is suitable for mapping electric field intensity and phase near to the surface of terahertz reflective optics is presented. The system uses a fixed five parabolic mirror and transmitter/receiver head arrangement that has the benefit of requiring only the sample to be swept during measurement. The system has been tested with a micromilled aluminum zone plate reflector used as an exemplar structure. The measured focal point of the zone plat...

Double distortion correction method in a catadioptric vision system with a conic mirror.

Because of the low calibration precision caused by reflector distortion in catadioptric vision systems with conic mirrors, we proposed a double distortion correction model based on the panoramic image rectification. The lens distortion and the reflector distortion are analyzed independently in the mathematic model of the double distortion correction. Moreover, the modified model in this paper added the trigonometric functions into the polynomial model to solve the combined distortion. Additionally, extensiv...

Unpredictability does not hamper nonretinotopic motion perception.

The motion of parts of an object is usually perceived relative to the object, i.e., nonretinotopically, rather than in retinal coordinates. For example, we perceive a reflector to rotate on the wheel of a moving bicycle even though its trajectory is cycloidal on the retina. The rotation is perceived because the motion of the object (bicycle) is discounted from the motion of its parts (reflector). It seems that the visual system can easily compute the object motion and subtract it from the part motion. Bikes...

Anion Relay Chemistry: Development of an Effective Diastereoselective 3+2 Annulation Tactic Exploiting an Aldol/Brook Rearrangement/Cyclization Cascade.

An effective [3+2] annulation tactic for the construction of diverse bicyclic compounds possessing highly functionalized cyclopentane rings has been developed employing soft ketone enolates as the initial nucleophile for anion relay chemistry (ARC). The protocol entails a highly diastereoselective aldol/Brook rearrangement/cyclization cascade.

Effects of reduced nitrogen inputs on crop yield and nitrogen use efficiency in a long-term maize-soybean relay strip intercropping system.

The blind pursuit of high yields via increased fertilizer inputs increases the environmental costs. Relay intercropping has advantages for yield, but a strategy for N management is urgently required to decrease N inputs without yield loss in maize-soybean relay intercropping systems (IMS). Experiments were conducted with three levels of N and three planting patterns, and dry matter accumulation, nitrogen uptake, nitrogen use efficiency (NUE), competition ratio (CR), system productivity index (SPI), land equ...

Tandem Pd and Isothiourea Relay Catalysis: Enantioselective Synthesis of α-Amino Acid Derivatives via Allylic Amination and 2,3-Sigmatropic Rearrangement.

A tandem relay catalytic protocol using both Pd and isothiourea catalysis has been developed for the enantioselective synthesis of α-amino acid derivatives containing two stereogenic centers from readily accessible N,N-disubstituted glycine aryl esters and allylic phosphates. The optimized process uses a bench-stable succinimide-based Pd-precatalyst (FurCat) to promote Pd-catalyzed allylic ammonium salt generation from the allylic phosphate and the glycine aryl ester. Subsequent in situ enantioselective [2...

Experimental demonstration of a single silicon ring resonator with an ultra-wide FSR and tuning range.

We present an experimental realization of a pseudo single-mode silicon ring resonator with an ultra-wide free spectral range and tuning range. The device is a single microring resonator with a tunable reflector integrated inside. The reflector is designed to have zero reflection for only one resonance of the ring, while all other resonances will suffer strong reflection. Given that the reflection inside a ring resonator leads to resonance splitting and degradation of the extinction ratio (ER), we obtain a r...

Priority Queue Based Reactive Buffer Management Policy for Delay Tolerant Network under City Based Environments.

Delay Tolerant Network (DTN) multi-copy routing protocols are privileged to create and transmit multiple copies of each message that causes congestion and some messages are dropped. This process is known as reactive drop because messages were dropped re-actively to overcome buffer overflows. The existing reactive buffer management policies apply a single metric to drop source, relay and destine messages. Hereby, selection to drop a message is dubious because each message as source, relay or destine may have...

GeSn resonant-cavity-enhanced photodetectors on silicon-on-insulator platforms.

We report GeSn p-i-n resonant-cavity-enhanced photodetectors (RCEPDs) grown on silicon-on-insulator substrates. A vertical cavity, composed of a buried oxide as the bottom reflector and a deposited SiOlayer on the top surface as the top reflector, is created for the GeSn p-i-n structure to enhance the light-matter interaction. The responsivity experiments demonstrate that the photodetection range is extended to 1820 nm, completely covering all the telecommunication bands, because of the introduction of 2.5...

Varying Success of Relaying To Reduce Vibrio parahaemolyticus Levels in Oysters ( Crassostrea virginica).

Vibrio parahaemolyticus is the leading cause of seafood-borne human infections in the United States, and many of these illnesses are associated with consumption of raw molluscan shellfish. V. parahaemolyticus levels in shellfish vary temporally and spatially with environmental conditions in and around production areas. The objective of this study was to study the potential for reducing levels of V. parahaemolyticus in live oysters by relaying them during higher-risk warm weather to a site with elevated sali...

Filtering characteristics of a three-lens slit spatial filter for high-power lasers.

Aiming for a three-lens slit spatial filtering system with excellent performances in inhibition of pinhole closure, improvement of beam quality, compactness of the system, and lowering the requirement of vacuum, the filtering characteristics and image relay of the slit spatial filter are demonstrated. The results show that the beam quality is greatly improved, and the system has a good property in image relay, which has potential applications in high-power lasers.

Considering quality of life in end-of-life decisions for severely disabled children.

End-of-life decisions (EoLDs) are very difficult to make. How parents and physicians incorporate quality of life (QoL) considerations into their end-of-life decision making (EoLDM) for children with profound intellectual and multiple disabilities (PIMD) remains unknown.

Systematic review of quality of life in Turner syndrome.

This study aimed to systematically review the available literature on "quality of life" (QoL) or "health-related quality of life" (HRQoL) in Turner syndrome (TS) patients and to analyze the relations among height, puberty, and the use of growth hormone (GH) and the QoL of TS patients.

Secure Communications in CIoT Networks with a Wireless Energy Harvesting Untrusted Relay.

The Internet of Things (IoT) represents a bright prospect that a variety of common appliances can connect to one another, as well as with the rest of the Internet, to vastly improve our lives. Unique communication and security challenges have been brought out by the limited hardware, low-complexity, and severe energy constraints of IoT devices. In addition, a severe spectrum scarcity problem has also been stimulated by the use of a large number of IoT devices. In this paper, cognitive IoT (CIoT) is consider...

"It was the best worst day of my life": Narrative Content, Structure, and Process in Wisdom-Fostering Life Event Memories.

The purpose of this study was to examine laypeople's subjective understanding of their own wisdom development. To do this, autobiographical memories of wisdom-fostering life events were examined for (a) life-event characteristics, and (b) self-reflective processes believed to support growth in wisdom through life experience.

Association of Early-Life Factors With Life-Course Trajectories of Resting Heart Rate: More Than 6 Decades of Follow-up.

Higher resting heart rate (RHR) is associated with increased risk of cardiovascular and all-cause mortality. Limited attention has been paid to early-life determinants of life-course RHR.

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