Journal articles: 'Structure RX'

1

Abou Houran, Mohamad, Xu Yang, and Wenjie Chen. "Design of a Cylindrical Winding Structure for Wireless Power Transfer Used in Rotatory Applications." Electronics 9, no. 3 (March 23, 2020): 526. http://dx.doi.org/10.3390/electronics9030526.

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A cylindrical joint structure for wireless power transfer (WPT) systems is proposed. The transmitter (Tx) and receiver (Rx) coils were wound on hemicylindrical and cylindrical structures, respectively. The Rx coil rotates freely around the axial direction of the Tx coil. Different methods of winding the Tx and Rx coils are given and discussed. Electromagnetic fields (EMFs) around the WPT windings should be lower than the limits set by WPT standards. Therefore, the WPT windings were designed to reduce EMF level and maintain constant power-transfer efficiency (PTE). The design procedures of the windings are discussed in detail. EMF analysis was done under different rotation angles (α). The selected design reduced the variation of the mutual inductance (M). As a result, it maintained a constant PTE while rotating the Rx coil between 0° and 85°. Moreover, leakage magnetic fields (LMFs) near the WPT coils of the chosen design were reduced by 63.6% compared with other winding methods that have the same efficiency. Finally, a prototype was built to validate the proposed idea. Experiment results were in good agreement with the simulation results. The WPT system maintained constant efficiency in spite of the rotation of Rx coil, where efficiency dropped by only 2.15% when the Rx coil rotated between 0° and 85°.

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Löwe, Christiane, Gottfried Huttner, Laszlo Zsolnai, and Heinz Berke. "Acetalisierte Formylmangan-Komplexe / Acetals of Formyl Manganese Complexes." Zeitschrift für Naturforschung B 43, no. 1 (January 1, 1988): 25–30. http://dx.doi.org/10.1515/znb-1988-0106.

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Abstract Acetal complexes of the type (OC)5 MnCH(XR)2 , RX = PhO (1a), (RX)2 = 1,2-dioxybenzene (1b), (RX), = S-(CH2)3-S (2) and (5) were synthesized. Glyoxyloyl acetal derivatives (OC)5 MnC(O)CH(XR)2, RX = PhO (3a), (RX)2 = 1,2-dioxybenzene (3b), (RX)2 = S-(CH2)3-S (4) were obtained by the action of NaMn(CO)5 upon the corresponding acid chlorides or anhydrides, la can be transformed to 3a by CO insertion, 1a has been characterized by an X-ray structure determination.

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Hollis, J. M., F. Yusef-Zadeh, T. J. Cornwell, R. J. Oliversen, A. G. Michalitsianos, and M. Kafatos. "RX Puppis - Detection of asymmetrical radio structure." Astrophysical Journal 337 (February 1989): 514. http://dx.doi.org/10.1086/167119.

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4

Laksono, P. B., and M. Alaydrus. "Improved Efficiency of Inductive Power Transfer in Misalignment Conditions with Multi Coil Design." Advanced Electromagnetics 8, no. 1 (March 17, 2019): 30–36. http://dx.doi.org/10.7716/aem.v8i1.904.

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In charging process of electric vehicle, a misalignment between the transmitter (Tx) and receiver (Rx) coupling structure decreases the efficiency of the wireless power transfer. In inductive power transfer system, misalignment reduces the effective coupling between the Tx and Rx coils. In this work, based on previous multiple coil structures, a new multi coil design in proposed to increase the efficiency of the power transfer. Here, a multi coil structure with two rectangular and four spiral coils is designed with the overall dimension of the coil structure 26.5 cm x 36.5 cm. The measurement shows, that for coil distance below 10.3 cm and a lateral misalignment of maximal 10 cm (27.4%), the efficiency of the designed multi coil structure is better compared to previous coil structures. However for larger coil distance or larger misalignment, the efficiency of the new coil structure deteriorates significantly.

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5

Kim, Young-Jun, Gunhark Noh, Han Lim Lee, and Sungwook Yu. "Dual-Polarized Multi-Channel 24 GHz Radar Sensor Antenna for High Channel-to-Channel Isolation." Sensors 20, no. 18 (September 14, 2020): 5233. http://dx.doi.org/10.3390/s20185233.

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This article presents a dual-polarized, high gain multi-beam and high T/Rx channel-to-channel isolation antenna module for 24 GHz sensor applications. The proposed antenna is configured to support 2-Tx and 2-Rx channels with a pair of vertically polarized (VP) radiation pattern and a pair of horizontally polarized (HP) radiation pattern. Further, each linearly polarized T/Rx antenna is configured by 2 × 4 array with a multi-layer integrated feed network, resulting in four sets of 2 × 4 array antennas fabricated within a single printed circuit board (PCB). Since multiple RF channels must be ensured with minimal interference, high antenna-to-antenna, including Tx-to-Tx, Rx-to-Rx, and Tx-to-Rx port isolations in the proposed antenna are achieved by multi-layered feed network and four sets of T-shaped magnetic walls. To verify the performance of the proposed structure, a 2-Tx and 2-Rx antenna module was fabricated at 24 GHz. The fabricated antenna showed a measured maximum 10-dB impedance bandwidth of 3.9% with a maximum measured gain of 11.7 dBi, considering both Tx and Rx. Further, the measured channel-to-channel isolations were always better than 35.6 dB at 24 GHz.

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Efanov, Alexandre M., Sergei V. Zaitsev, Ioulia B. Efanova, Shunsheng Zhu, Claes-Göran Östenson, Per-Olof Berggren, and Suad Efendić. "Signaling and sites of interaction for RX-871024 and sulfonylurea in the stimulation of insulin release." American Journal of Physiology-Endocrinology and Metabolism 274, no. 4 (April 1, 1998): E751—E757. http://dx.doi.org/10.1152/ajpendo.1998.274.4.e751.

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The objective of this study was to compare effects of RX-871024, a compound with imidazoline structure, and the sulfonylurea glibenclamide, representatives of two groups of ATP-dependent potassium channel (KATP) blockers, on insulin secretion and cytoplasmic free calcium concentration ([Ca2+]i). Furthermore, we studied the interaction of the compounds on these two parameters. The experiments were performed in the perfused rat pancreas, isolated rat pancreatic islets, and dispersed β-cells. At maximal effective concentrations of the compounds, RX-871024 had a more pronounced insulinotropic effect than glibenclamide, but the increase in [Ca2+]iwas similar. Glibenclamide enhanced the insulinotropic effect of suboptimal concentrations of RX-871024 at 3.3 and 16.7 mM glucose. Notably, glibenclamide and RX-871024 also stimulated insulin secretion under Ca2+-clamped conditions, i.e., during plasma membrane depolarization with KCl and glucose or in permeabilized islets. The magnitudes of insulin stimulation under the latter types of conditions were similar for both compounds. It is concluded that RX-871024 and the sulfonylurea glibenclamide promote insulin secretion by two mechanisms, namely closure of KATP channels and a direct stimulation of exocytosis. At a similar increase in [Ca2+]i, the maximal stimulatory effect of RX-871024 on insulin secretion was stronger than that of glibenclamide, implying that RX-871024 also affects insulin secretion by a signal transduction pathway that is not activated by glibenclamide.

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7

Taha, Emad, Samia Hekal, and Ahmed Ibrahim Nasr. "Evaluating skin quality of some rabbit breeds under Egyptian conditions." World Rabbit Science 25, no. 2 (June 28, 2017): 193. http://dx.doi.org/10.4995/wrs.2017.6652.

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Histological skin parameters in addition to mechanical and chemical properties of chrome tanned rabbits’ furs were determined in this study to evaluate and compare the quality of some rabbit breeds. Seventy-nine male rabbits aged 3 mo of New Zealand White (NZW, n=27), Rex (RX, n=24) and Gabaly (GB, n=28) were used. Results showed that GB skins had the highest values in skin weight (P<0.01) and area (P<0.05) followed by NZW and RX skins, respectively. Moreover, NZW skins differed in histological structure from the other 2 breeds, as total thickness and thickness of papillary and hypodermis layers in NZW were more than twice those of RX and GB (P<0.05). This structure is caused by an increase in fine collagen fibre bundles in papillary layer and a limited increase in larger collagen fibre bundles in the reticular layer. Furthermore, finished tanned furs properties clarify the superiority of GB furs in values of tensile and tearing strengths followed by NZW and RX, respectively. These results point to the possibility of using the chrome tanned furs of the 3 breeds in leather garment manufacturing.

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Konpang, Jessada, and Natchayathorn Wattikornsirikul. "Four-Port Dual-Mode Diplexer with High Signal Isolation." Active and Passive Electronic Components 2020 (February 10, 2020): 1–5. http://dx.doi.org/10.1155/2020/4032673.

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An ease of four-port dual-mode diplexer with high signal isolation is presented. A compact dual-mode diplexer with high signal isolation between the Rx and Tx modules is achievable by only using one resonator filter topology. Two back-to-back dual-mode diplexers have a 180° phase shift in one branch. The high isolation can be achieved by amplitude and phase cancellation technique. The delayed transmission line can be easily achieved by the phase shifter. The simulated and measured four-port dual-mode diplexers are designed at the centre frequency of Rx/Tx at 1.95 GHz and 2.14 GHz, respectively. The measured results of Rx/Tx dual-mode diplexer devices are presented with 47.1 dB Rx/Tx isolation. This four-port dual-mode diplexer achieves the isolation (S32) of more than 24.1 dB when compared with the conventional three-port dual-mode diplexer structure.

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Popov, S. B., R. Taverna, and R. Turolla. "Probing the surface magnetic field structure in RX J1856.5−3754." Monthly Notices of the Royal Astronomical Society 464, no. 4 (October 18, 2016): 4390–98. http://dx.doi.org/10.1093/mnras/stw2681.

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Criqui, Michael H., Julie O. Denenberg, Cameron E. Bird, Arnost Fronek, Melville R. Klauber, and Robert D. Langer. "The Correlation between Symptoms and Non-Invasive Test Results in Patients Referred for Peripheral Arterial Disease Testing." Vascular Medicine 1, no. 1 (February 1996): 65–71. http://dx.doi.org/10.1177/1358863x9600100112.

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The WHO/Rose questionnaire has served as the epidemiologic and clinical standard in the assessment of leg pain in patients with peripheral arterial disease (PAD) for over three decades. However, the structure of this questionnaire does not allow assessment of leg-specific (i.e. right versus left) symptoms. We studied 508 patients aged 39–95 years (mean 68 years), initially referred for PAD non-invasive testing. A revised questionnaire, the San Diego Claudication Questionnaire, was administered which allowed determination of leg-specific symptoms and evaluated thigh and buttock as well as calf pain. Leg-specific symptoms were categorized into no pain, pain at rest, non-calf claudication, non-Rose calf claudication, and Rose claudication. At the same visit, the ankle brachial index, the toe brachial index, and peak posterior tibial flow velocity were measured by Doppler ultrasound and five categories of non-invasive results by type and severity of PAD were defined. Legs with previous intervention (Rx), surgery or angioplasty, were evaluated separately. Claudication was reported in 42% of no Rx legs and 50% of Rx legs; 40% of claudication was atypical (not Rose); 64% of no Rx and 81% of Rx legs had PAD by non-invasive testing, and 27% of affected legs had severe PAD. The correlation between the severity of symptoms and the severity of ipsilateral PAD in no Rx legs was r=−0.40, p< 0.001. In Rx legs, this correlation was somewhat less ( r=0.27, p< 0.001) due to more symptomatology at lesser degrees of PAD, suggesting reporting bias and/or more residual disease than evident from non-invasive testing. To our knowledge, these results provide the first comparison between a standardized assessment of leg pain and the severity of ipsilateral PAD by non-invasive testing.

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NOROTTE, GILLES. "THE “PENDULUM LAW” - HOW TO EXPLAIN THE COLUMN SHAPE BASED ON COMMON ANOMALIES? PART II." Coluna/Columna 17, no. 1 (March 2018): 51–54. http://dx.doi.org/10.1590/s1808-185120181701172494.

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ABSTRACT In Part I, the author defines an organizational law of the body schema: the “pendulum law”, describing an ideal biomechanical structure of the spine. Thus, he shows how the common variations and anomalies, whether isolated or associated, modify the standard biomechanical scheme. The variations of isolated “curl/roll up” of the sacrum. Anomalies of the lumbosacral joint in the sagittal (LSS) and/or rotational (LSR) plan. Anomalies of stabilization of the capsule of the hip joint and the sacro-diaphyseal angle. Specific anomalies with grade 1 spondylolysis (SL). Segmental anomalies of the vertebral discs in flexion (Rx). Associated anomalies (SL + Rx + ASL= Rx). The interest of studying the impact on the vertical construction of the vertebral column, according to the “ideal” scheme is to establish the physiological limits of this gravitational law, to identify the anomalies, to classify schemes and types, and the biomechanical degenerative consequences.

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12

Yoo, Bo-Yoon, Jae-Hyun Park, and Jong-Ryul Yang. "Quasi-Circulator Using an Asymmetric Coupler for Tx Leakage Cancellation." Electronics 7, no. 9 (September 1, 2018): 173. http://dx.doi.org/10.3390/electronics7090173.

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A quasi-circulator is proposed by using an asymmetric coupler with high isolation between the transmitting (Tx) and receiving (Rx) ports. The proposed quasi-circulator consists of quarter-wave transmission lines, which have unbalanced characteristic impedances and the terminated port, which is purposely unmatched with the reference impedance in the coupler. The port compensates for the asymmetric impedances of the coupler using the proposed design parameter. Because of its asymmetric structure and the usage of the unmatched port, the proposed circulator can be accurately designed to have high Tx–Rx isolation without increasing the signal losses in the Tx and Rx paths at the operating frequency. The proposed quasi-circulators show isolation improvements of 9.07 dB at 2.45 GHz and 7.95 dB at 24.125 GHz compared with conventional circulators using the symmetric couplers. The characteristic improvement of the proposed quasi-circulator was demonstrated by the increase of the detectable range of the 2.45 GHz Doppler radar sensor with the quasi-circulator.

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13

Abou Houran, Mohamad, Xu Yang, and Wenjie Chen. "Free Angular-Positioning Wireless Power Transfer Using a Spherical Joint." Energies 11, no. 12 (December 14, 2018): 3488. http://dx.doi.org/10.3390/en11123488.

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Many studies have investigated resonator structures and winding methods. The aims of this paper are as follows. First, the paper proposes an optimized winding model for a bio-inspired joint for a wireless power transfer (WPT) system. The joint consists of a small spherical structure, which rotates inside a hemispherical structure. The transmitter coil (Tx) is wound on the hemisphere structure, and the receiver coil (Rx) is wound on the small sphere. The power is transferred while rotating Rx over a wide range of angular misalignment. In addition, the algorithm design of the proposed winding method is given to get an optimized model. Moreover, the circuit analysis of the WPT system is discussed. Second, the magnetic field density is investigated considering a safety issue, which is linked to human exposure to electromagnetic fields (EMFs). Moreover, EMF mitigation methods are proposed and discussed in detail. Finally, the simulation results are validated by experiments, which have confirmed that the proposed winding method allows the system to rotate up to 85 degrees and achieve an efficiency above 86%. The proposed winding method for the WPT system can be a good technique for some robotic applications or a future replacement of the human joint.

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14

Atallah, Hany, Musallam Alzubi, Rasha Hussein, and Adel Abdlerhman. "Design of Dual Frequency Coupled Resonators Using DGS and Microstrip Resonators for Dual Band WPT Applications." Applied Computational Electromagnetics Society 36, no. 1 (February 27, 2021): 75–81. http://dx.doi.org/10.47037/2020.aces.j.360111.

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This paper introduces a new design for a highly efficient and more compact size dual frequency wireless power transfer (WPT) system, which can operate at both 0.65 GHz and 1.56 GHz bands. The idea of the structure depends on designing a symmetrical system containing Tx and Rx. Each Tx and Rx has a feed line on the top layer with two stubs; each stub has different dimensions than the other one. The bottom layer contains two C-shaped defected ground structures (DGS). By changing the dimensions of one stub, the frequency resonance corresponds to this stub is changed without any change on the other resonance. The system has a size of 20 × 20 mm2. Further, the system achieves efficiencies of 72 % and 89 % at 0.65 GHz and 1.56 GHz, respectively with a transmission distance of 8 mm. The proposed dual frequency WPT is implemented and verified. Good concurrences among electromagnetic (EM) simulations and the measurements have been attained. The system is suitable for recharging shortrange applications.

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Aguerri, J. A. L., A. Longobardi, S. Zarattini, A. Kundert, E. D’Onghia, and L. Domínguez-Palmero. "Fossil group origins." Astronomy & Astrophysics 609 (January 2018): A48. http://dx.doi.org/10.1051/0004-6361/201731711.

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Context. It is thought that fossil systems are relics of structure formation in the primitive Universe. They are galaxy aggregations that have assembled their mass at high redshift with few or no subsequent accretion. Observationally these systems are selected by large magnitude gaps between their 1st and 2nd ranked galaxies (Δm12). Nevertheless, there is still debate over whether or not this observational criterium selects dynamically evolved ancient systems. Aims. We have studied the properties of the nearby fossil group RX J075243.6+455653 in order to understand the mass assembly of this system. Methods. Deep spectroscopic observations allow us to construct the galaxy luminosity function (LF) of RX J075243.6+455653 down to Mr*+6. The analysis of the faint-end of the LF in groups and clusters provides valuable information about the mass assembly of the system. In addition, we have analyzed the nearby large-scale structure around this group. Results. We identified 26 group members within r200 ~ 0.96 Mpc. These galaxies are located at Vc = 15551 ± 65 km s-1 and have a velocity dispersion of σc = 333 ± 46 km s-1. The X-ray luminosity of the group is LX = 2.2 × 1043 h70-2 erg s-1, resulting in a mass of M = 4.2 × 1013 h70-1 within 0.5r200. The group has Δm12 = 2.1 within 0.5r200, confirming the fossil nature of this system. RX J075243.6+455653 has a central brightest group galaxy (BGG) with Mr = −22.67, one of the faintest BGGs observed in fossil systems. The LF of the group shows a flat faint-end slope (α = −1.08 ± 0.33). This low density of dwarf galaxies is confirmed by the low value of the dwarf-to-giant ratio (DGR = 0.99 ± 0.49) for this system. Both the lack of dwarf galaxies and the low luminosity of the BGG suggests that RX J075243.6+455653 still has to accrete mass from its nearby environment. This mass accretion will be achieved because it is the dominant structure of a rich environment formed by several groups of galaxies (15) within ~ 7 Mpc from the group center and with ± 1000 km s-1. Conclusions. RX J075243.6+455653 is a group of galaxies that has not yet completed the process of its mass assembly. This new mass accretion will change the fossil state of the group. This group is an example of a galaxy aggregation selected by a large magnitude gap but still in the process of the accretion of its mass.

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Sicilia-Aguilar, A., C. F. Manara, J. de Boer, M. Benisty, P. Pinilla, and J. Bouvier. "Time-resolved photometry of the young dipper RX J1604.3-2130A." Astronomy & Astrophysics 633 (January 2020): A37. http://dx.doi.org/10.1051/0004-6361/201936565.

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Context. RX J1604.3-2130A is a young, dipper-type, variable star in the Upper Scorpius association, suspected to have an inclined inner disk, with respect to its face-on outer disk. Aims. We aim to study the eclipses to constrain the inner disk properties. Methods. We used time-resolved photometry from the Rapid Eye Mount telescope and Kepler 2 data to study the multi-wavelength variability, and archival optical and infrared data to track accretion, rotation, and changes in disk structure. Results. The observations reveal details of the structure and matter transport through the inner disk. The eclipses show 5 d quasi-periodicity, with the phase drifting in time and some periods showing increased/decreased eclipse depth and frequency. Dips are consistent with extinction by slightly processed dust grains in an inclined, irregularly-shaped inner disk locked to the star through two relatively stable accretion structures. The grains are located near the dust sublimation radius (~0.06 au) at the corotation radius, and can explain the shadows observed in the outer disk. The total mass (gas and dust) required to produce the eclipses and shadows is a few % of a Ceres mass. Such an amount of mass is accreted/replenished by accretion in days to weeks, which explains the variability from period to period. Spitzer and WISE infrared variability reveal variations in the dust content in the innermost disk on a timescale of a few years, which is consistent with small imbalances (compared to the stellar accretion rate) in the matter transport from the outer to the inner disk. A decrease in the accretion rate is observed at the times of less eclipsing variability and low mid-IR fluxes, confirming this picture. The v sin i = 16 km s−1 confirms that the star cannot be aligned with the outer disk, but is likely close to equator-on and to be aligned with the inner disk. This anomalous orientation is a challenge for standard theories of protoplanetary disk formation.

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Yan, Hongmei, Mingyi He, and Hanxue Mei. "Adaptive multi-layer structure with spatial-spectrum combination for hyperspectral image anomaly detection." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 3 (June 2021): 484–91. http://dx.doi.org/10.1051/jnwpu/20213930484.

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A new algorithm for hyperspectral image anomaly detection is proposed by designing an adaptive multi-layer structure with spatial-spectral combination information, which is different from the traditional anomaly detection algorithms only considering the spectral difference between the anomaly point and the background pixels, and ignoring the difference between the local spatial structure and spectrum. Firstly, the present algorithm not only calculates the spectral dimension difference between the pixels to be measured and the pixels in the background window, but also measures the spatial structure difference between the internal window and the background window. Mostly, an adaptive multi-layer structure for anomaly detection framework is carried out based on the idea of background suppression, and a multi-layered anomaly detector is constructed. The anomaly detection results of each layer of the detector are taken as the constraints, and the background information of the image input in the detector of the next layer is suppressed, adaptively suppressing the background noises. The experimental results show that the present algorithm makes better use of both the local spatial structure and the spectral dimension information than the traditional two-window models (global RX, local RX and KRX), adaptively suppresses background, reduces the false alarm rate, and improves the detection effect of the abnormal targets with fewer pixels.

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Kurzhals, Anja, Jörn-Bo Matthies, Reimer Andresen, Niels Grabow, Klaus-Peter Schmitz, and Wolfram Schmidt. "Investigation of the pressure gradient of embolic protection devices." Current Directions in Biomedical Engineering 2, no. 1 (September 1, 2016): 359–62. http://dx.doi.org/10.1515/cdbme-2016-0080.

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AbstractTo avoid debris coming to the cerebral vessels during carotid artery stenting, embolic protection devices (EPD) are placed in front of the lesion. To evaluate their influence on the antegrade blood flow a test setup with a silicone tube simulating the internal carotid artery is realized. The pressure gradient of five different EPD was measured while particles were brought into the circuit and were caught by the systems. Additionally the microscopic structure of the systems was observed to correlate the morphology and the pressure gradient. The FiberNet device had the lowest pressure gradient. It was the only system that consists of fibers contrary to the systems RX Accunet, Angioguard RX, FilterWireEZ and EmboshieldNAV that contain porous membranes.

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Lainé, Eric, Jean-Claude Grandidier, Maxime Cruz, Anne-Laure Gorge, Claire Bouvy, and Geert Vaes. "Acoustic emission description from a damage and failure scenario of rotomoulded polyolefin sandwich structure subjected to internal pressure for storage applications." Mechanics & Industry 21, no. 1 (2020): 105. http://dx.doi.org/10.1051/meca/2019077.

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The aim of this paper is to study the damage mechanisms in a sandwich polymer structure that contains three layers: two polyolefin skins and the foam core (skin–foam–skin). Specific tests on structure associated with the acoustic emission (AE) technique and tomographic observations (RX) are used to identify the damage. Initially, a conventional tensile test was performed to correlate the acoustic emission with the initiation of plasticity and damage to a polyethylene sample. The results obtained are close to those observed in other studies and it is possible to separate the signal from cavitation and propagation of necking. The technique is then employed to capture the rupture of a polymer skin on a multilayer rotomoulded structure (bottle). Tests were carried out on this bottle under internal water pressure. Three tests are performed with more or less early interruptions in order to identify the first damage and understand their evolution. Different quantities (average frequency, RA value, etc.) are observed in order to quantify and understand the perceived damage. With the AE/RX correlation and mechanical behaviour, a scenario of structural damage is proposed.

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Harlaftis, E. T., and K. Horne. "The Spin-Resolved He ɪɪ Profile of RX J0558+53." International Astronomical Union Colloquium 163 (1997): 715–16. http://dx.doi.org/10.1017/s0252921100043591.

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AbstractWe observed the new intermediate polar RX J0558+53 withthe 4.2m WHT in March 1995. We detect 2–3%% pulsations of the He ɪɪ emission line on the 545s spin period. The spin-resolved Hell spectrogram shows a complex structure with two roughly anti-phased components moving from red to blue (double pulse). This is most likely produced by non-axisymmetric gas flow in the rotating magnetosphere of the white dwarf.

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Tinant, B., A. Parfonry, G. Germain, J. P. Declercq, and M. van Meerssche. "Structure Par Diffraction Des RX du Bis(Diméthylamino)-2,3 Succinate de Diméthyle C10H20N2O4." Bulletin des Sociétés Chimiques Belges 92, no. 4 (September 1, 2010): 405–6. http://dx.doi.org/10.1002/bscb.19830920410.

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Zhu, Cuirong, Chunhua Wang, Hua Chen, Xin Zhang, Jingru Sun, and Sichun Du. "A Novel CMOS CCCII with Wide Tunable Rx and Its Application." Journal of Circuits, Systems and Computers 27, no. 13 (August 3, 2018): 1850198. http://dx.doi.org/10.1142/s0218126618501980.

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This paper introduces a novel CMOS second-generation current-controlled current conveyor (CCCII) that has a wide tunable intrinsic resistance ([Formula: see text]. The designed structure is achieved by the combination of one ordinary CCCII, one cross-coupled OTA and one active resistor. An inverse relationship between the intrinsic resistance and external bias current is created for the first time in CMOS CCCII design, which results in wide tuning range of [Formula: see text]. Performance of the proposed circuit is discussed by detailed analysis. The CMOS CCCII is simulated in TSMC 0.18[Formula: see text][Formula: see text]m RF CMOS technology. The simulation results confirm that the proposed CMOS CCCII achieves a wide tunable [Formula: see text] (from 197.4[Formula: see text][Formula: see text] to 27.23[Formula: see text]k[Formula: see text]) while maintaining favorable performance in bandwidth, transfer gain and linear range. In addition, a new reconfigurable structure, which can function as a universal filter or a quadrature oscillator via controlling an enabled switch, is given as an application example to validate the feasibility of the proposed CMOS CCCII.

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Cheng, Guoxiao, Zhiqun Li, Zhennan Li, Zengqi Wang, and Meng Zhang. "A Highly-Integrated, Switchless and Baluns-Embedded Transceiver with a Differential Structure for C-Band Radar Application." Journal of Circuits, Systems and Computers 29, no. 10 (December 9, 2019): 2050160. http://dx.doi.org/10.1142/s0218126620501601.

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This paper presents a highly-integrated transceiver with a differential structure for C-band (5–6[Formula: see text]GHz) radar application using a switchless and baluns-embedded configuration. To reduce the noise figure (NF) in receiver (Rx) mode and enhance the output power in transmitter (Tx) mode, the balun at RF port is embedded into the low-noise amplifier (LNA) and the power amplifier (PA), respectively. Besides, the RF switch is removed by designing the matching networks that both LNA and PA can share. The same topology is also adopted at the IF port. To achieve a high image rejection ratio (IRR), a Hartley architecture using polyphase filters (PPFs) is adopted. The proposed transceiver has been implemented in 1P6M 0.18-[Formula: see text]m CMOS process. The receiver achieves 6.9-dB NF, [Formula: see text]7.5-dBm IIP3 and 26.3-dB gain with three-step digital gain controllability. Also the measured IRR is better than 41[Formula: see text]dBc. The transmitter achieves 9.6-dBm output power and 19.2-dB gain. The chip consumes 106[Formula: see text]mA in the Rx mode and 141[Formula: see text]mA in the Tx mode from the 3.3-V power supply.

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Borghese, A., N. Rea, and F. Coti Zelati. "X-ray Dim Isolated Neutron Stars and phase-dependent absorption features." Proceedings of the International Astronomical Union 13, S337 (September 2017): 315–16. http://dx.doi.org/10.1017/s1743921317008250.

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AbstractThanks to a detailed pulse phase spectroscopy of archival XMM–Newton observations, we discovered narrow and strongly phase-dependent absorption features in the X-ray spectra of two X-ray dim isolated neutron stars (XDINSs), RX J0720.4-3125 and RX J1308.6+2127. The spectral lines show similar properties: they are detected in only 20% of the rotational cycle with an energy of ~ 740 eV and appear to be stable over the timespan covered by the observations. The strong dependence on the pulsar rotation and the narrow width suggest that the features are most likely due to proton cyclotron resonant scattering in a confined magnetic structure close to the stellar surface. The inferred magnetic field in such a loop is of the order of ~ 1014 G, higher than the surface dipolar magnetic field (~ 1 – 3.5 × 1013 G for the XDINSs).

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Djatmiko, Agus Budi. "PENELITIAN TRANSMISIBILITAS ALAT PEREDAM GETARAN PADA MUATAN ROKET RX 550 LAPAN (RESEARCH TRANSMISSIBILITY OF VIBRATION DAMPERS EQUIPMENTS ON ROCKET RX 550 LAPAN)." Jurnal Teknologi Dirgantara 15, no. 2 (February 27, 2018): 133. http://dx.doi.org/10.30536/j.jtd.2017.v0.a2497.

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Every single piece of structural engineering as well as the rocket payload, has its mass and elasticity, and also has the potential to cause vibration. In general, the occurrence of vibration in the engineering structure is not desirable. Therefore, to the extent possible the vibrations is arranged to be muted. Acceleration nuisance caused by the combustion process in rocket can cause vibrations with a large amplitude resulting in damage to the structure of the mutant rockets and electronic equipment that is in charge of the rocket could not work as intended, based on the experience of electronic equipment will be damaged if the acceleration bully at 10 g that work on the rocket is not reduced, it is designed for a vibration damping apparatus, equipment consisting of springs and dampers are arranged such that a damping effecton the vibration occurs.In this research used springs with stiffness k = 120,000 N/m, damping factor = 0.0503 and mass of charge (m) = 10.5 kg, with acceleration of 1 G and working frequency from 0 to 2000 Hz. Interest transmissibility research on tool vibration dampers is to determine the magnitude of the acceleration is transmitted to the rocket payload. The results of the dampening experiment, at the beginning of acceleration or G force transmitted to a rocket load of 1 g or TR = 1, but after passing a resonance or obtained G force transmitted to a rocket payload of 0,1 g or TR = 0.1 (the silencer is good enough). From the results of this study can be said that the silencer can be used to reduce vibration on the rocket payload RX 550. AbstrakSetiap struktur rekayasa seperti halnya pada muatan roket, mempunyai massa dan elastisitas, maka struktur tersebut mempunyai potensi untuk menimbulkan getaran. Pada umumnya terjadinya getaran pada struktur rekayasa adalah tidak diinginkan, oleh karena itu sedapat mungkin getaran tersebut diusahakan untuk diredam. Percepatan pengganggu yang ditimbulkan oleh proses pembakaran pada roket dapat menyebabkan getaran dengan amplitudo yang besar yang mengakibatkan kerusakan pada struktur mutan roket dan alat elektronik yang ada pada muatan roket sehingga tidak dapat bekerja seperti yang diinginkan. Berdasarkan pengalaman, alat elektronik akan mengalami kerusakan jika percepatan pengganggu sebesar 10 g yang bekerja pada roket tidak direduksi. Untuk itu dirancang suatu alat peredam getaran, peralatan tersebut terdiri dari pegas dan damper atau peredam yang disusun sedemikian rupa sehingga muncul efek redaman terhadap getaran. Pada penelitian ini digunakan pegas dengan kekakuan k = 120.000 N/m, faktor redaman = 0,0503 dan massa muatan (m) = 10,5 kg, dengan percepatan sebesar 1 G dan frekuensi kerja dari 0 sampai dengan 2000 Hz. Tujuan penelitian transmisibilitas pada alat peredam getaran ini adalah untuk mengetahui besarnya percepatan yang ditransmisikan ke muatan roket. Hasil penelitian alat peredam, pada saat awal percepatan pengganggu atau G force yang ditransmisikan ke muatan roket sebesar 1 g atau TR = 1, tetapi setelah melewati resonansi atau didapat G force yang ditransmisikan ke muatan roket sebesar 0,1 g atau TR = 0,1 (alat cukup baik). Dari hasil penelitian ini dapat dikatakan bahwa alat peredam dapat digunakan untuk meredam getaran pada muatan roket RX 550.

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Xi, Zhenzhu, Xia Long, Long Huang, Sheng Zhou, Gang Song, Haitao Hou, Xingpeng Chen, Liang Wang, Wei Xiao, and Qingxing Qi. "Opposing-coils transient electromagnetic method focused near-surface resolution." GEOPHYSICS 81, no. 5 (September 2016): E279—E285. http://dx.doi.org/10.1190/geo2014-0564.1.

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The transient electromagnetic (TEM) method is a commonly used, nonintrusive, geophysical method, but inherent mutual induction between the transmitter (TX) and receiver (RX) coils strongly influences the measurements. We have developed an opposing-coils configuration to greatly reduce this effect. Three coils are used in this system. The upper opposing coil is physically the same as the lower TX coil, and they are concentric and parallel to the middle RX coil. A pair of currents with equal amplitudes but reverse directions is injected into the opposing and TX coils. Theoretical calculations in free space show that the received magnetic field by the RX coil is zero, which indicates that the mutual induction effect could be largely reduced. Physical experiments prove that an almost-pure secondary field could be acquired using this system. We have studied an optimal separation between the TX and opposing coils to guarantee that the primary magnetic field is powerful and the instrument is compacted for field work. Then, the efficient exploration depth of this system for typical geoelectric models was simulated to be approximately 15–50 m. Comparisons of simulated responses over highly conductive thick plates in free space and a field test over a culvert structure between this system and EM-47 showed that the system has enhanced sensitivity and lateral resolution. This system can be used in near-surface investigations, e.g., groundwater, environmental, and engineering investigations.

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Delgado, G. E., P. Grima-Gallardo, J. A. Aitken, H. Cabrera, J. Cisterna, A. A. Cárdenas, and I. Brito. "Crystal structure and powder X-ray diffraction data of the super-paramagnetic compound CuFeInTe3." Revista Mexicana de Física 67, no. 2 Mar-Apr (July 15, 2021): 305–11. http://dx.doi.org/10.31349/revmexfis.67.305.

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The crystal structure of the new CuFeInTe3 quaternary compound was studied by the Rietveld method from powder X-ray diffraction data. The CuFeInTe3 compound crystallize in the tetragonal CuFeInSe3-type structure with space group P2c (Nº 112), and unit cell parameters a = 6.1842(1) Å, c = 12.4163(2) Å, V = 474.85(1) Å3. The density of CuFeInTe3 is rx = 5.753 g cm−3. The reliability factors of the Rietveld refinement results are Rp= 5.5%, Rwp= 6.1%, Rexp= 4.7%, and S= 1.3. The powder XRD data of CuFeInTe3 are presented and the figures of merit of indexation are M20 = 79.4 and F30 = 43.3 (0.0045, 154).

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Pineda-Flores, José L., E. Chavira, J. Reyes-Gasga, A. M. González, and A. Huanosta-Tera. "Synthesis and dielectric characteristics of the layered structure Bi4−xRxTi3O12 (Rx=Pr, Nd, Gd, Dy)." Journal of the European Ceramic Society 23, no. 6 (May 2003): 839–50. http://dx.doi.org/10.1016/s0955-2219(02)00226-1.

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Kunzler, Jakob W., Jacob M. Bartschi, and Karl F. Warnick. "Compact structure with high TX-RX isolation for frequency domain duplexing on printed circuit boards." Journal of Electromagnetic Waves and Applications 34, no. 3 (January 28, 2020): 390–95. http://dx.doi.org/10.1080/09205071.2020.1715267.

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Rasche, V., C. Graeff, T. Istel, R. Koppe, and C. C. Glüer. "3D-rotational X-ray imaging (3D-RX) for the depiction of the trabecular bone structure." International Congress Series 1281 (May 2005): 159–63. http://dx.doi.org/10.1016/j.ics.2005.03.230.

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Reissová, Alena, Zdeněk Bastl, and Martin Čapka. "The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes." Collection of Czechoslovak Chemical Communications 51, no. 7 (1986): 1430–38. http://dx.doi.org/10.1135/cccc19861430.

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The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

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32

Li, Chao-Ying, Shi-Fei Liu, and Jin-Xian Fu. "Investigations of the EPR Parameters and Local Lattice Structure for the Rhombic Cu2+ Centre in TZSH Crystal." Zeitschrift für Naturforschung A 71, no. 3 (March 1, 2016): 255–60. http://dx.doi.org/10.1515/zna-2015-0396.

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AbstractThe electron paramagnetic resonance (EPR) parameters [i.e. g factors gi (i=x, y, z) and hyperfine structure constants Ai] and the local lattice structure for the Cu2+ centre in Tl2Zn(SO4)2·6H2O (TZSH) crystal were theoretically investigated by utilising the perturbation formulae of these parameters for a 3d9 ion under rhombically elongated octahedra. In the calculations, the admixture of d orbitals in the ground state and the ligand orbital and spin-orbit coupling interactions are taken into account based on the cluster approach. The theoretical EPR parameters show good agreement with the observed values, and the Cu2+–H2O bond lengths are obtained as follows: Rx≈1.98 Å, Ry≈2.09 Å, Rz≈2.32 Å. The results are discussed.

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33

Uchiyama, Y., F. A. Aharonian, and T. Takahashi. "Fine-structure in the nonthermal X-ray emission of SNR RX J1713.7-3946 revealed by Chandra." Astronomy & Astrophysics 400, no. 2 (March 2003): 567–74. http://dx.doi.org/10.1051/0004-6361:20021824.

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Utkin, Igor, Yury Teterin, Vladimir Terenov, Mikhail Ryznkov, Anton Teterin, and Labud Vukcevic. "X-ray spectral studies of the electronic structure of uranyl fluorite UO2F2." Nuclear Technology and Radiation Protection 19, no. 2 (2004): 15–23. http://dx.doi.org/10.2298/ntrp0402015u.

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This work interpreted the fine X-ray photoelectron spectral structure of the low binding energy electrons (0-40 eV) and X-ray O4,5(U) emission spectral structure from UO2F2 taking into account the relativistic X? discrete variation (RX?-DV) calculation for the [(UO2)F6]4?(D6h) cluster reflecting an uranium close environment in UO2F2. The U5f electrons were shown to participate directly in the chemical bond formation. The U6p electrons were shown to participate not only information of the inner valence molecular orbitals, but also information of the outer valence molecular orbitals. The inner valence molecular orbitals sequence order in the binding energy range 12-40 eV was established. It is important for development of the technique of interatomic distance determination in the axial direction and equatorial plane of uranyl compounds on the X-ray photoelectron spectral basis.

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Di Mascolo, Luca, Eugene Churazov, and Tony Mroczkowski. "A joint ALMA–Bolocam–Planck SZ study of the pressure distribution in RX J1347.5−1145." Monthly Notices of the Royal Astronomical Society 487, no. 3 (June 6, 2019): 4037–56. http://dx.doi.org/10.1093/mnras/stz1550.

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ABSTRACT We report the joint analysis of single-dish and interferometric observations of the Sunyaev–Zeldovich (SZ) effect from the galaxy cluster RX J1347.5−1145. We have developed a parametric fitting procedure that uses native imaging and visibility data, and tested it using the rich data sets from ALMA, Bolocam, and Planck available for this object. RX J1347.5−1145 is a very hot and luminous cluster showing signatures of a merger. Previous X-ray-motivated SZ studies have highlighted the presence of an excess SZ signal south-east of the X-ray peak, which was generally interpreted as a strong shock-induced pressure perturbation. Our model, when centred at the X-ray peak, confirms this. However, the presence of two almost equally bright giant elliptical galaxies separated by ∼100 kpc makes the choice of the cluster centre ambiguous, and allows for considerable freedom in modelling the structure of the galaxy cluster. For instance, we have shown that the SZ signal can be well described by a single smooth ellipsoidal generalized Navarro–Frenk–White profile, where the best-fitting centroid is located between the two brightest cluster galaxies. This leads to a considerably weaker excess SZ signal from the south-eastern substructure. Further, the most prominent features seen in the X-ray can be explained as predominantly isobaric structures, alleviating the need for highly supersonic velocities, although overpressurized regions associated with the moving subhaloes are still present in our model.

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Šimon, V., and A. Henden. "Activity of the Polar AM Her (RX J1816.2+4952): A Short Review." Acta Polytechnica CTU Proceedings 2, no. 1 (February 23, 2015): 81–85. http://dx.doi.org/10.14311/app.2015.02.0081.

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We show that AM Her displays the transitions between the high and low states with an intermittently existing dominant cycle with length between 400 and 800 days. Moreover, these transitions accumulate in clusters, which produces an additional long cycle after smoothing; a single isolated short episode of the low state does not suggest a break of this cycle. The seasons of existence of the cycle can be controlled by the lifetime of the active regions (e.g. prominences, spots) on the donor. In some high-state episodes, a higher luminosity of the bremsstrahlung emission is not accompanied by a higher optical (cyclotron+stream) emission. Part of the bremsstrahlung emission can be buried in some episodes. Changes of the structure of the accretion region(s) are necessary to explain the variations of the optical and X-ray activity in the high-state episodes of AM Her.

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Jaschke, Thomas, Hans K. Mitto, and Arne F. Jacob. "K/Ka-band dual-polarized SIW-fed lens antennas for Rx/Tx integration." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (April 3, 2018): 627–34. http://dx.doi.org/10.1017/s1759078718000399.

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AbstractThis contribution deals with array elements for K/Ka-band satellite communication terminals. It proposes an end-fire design realized in substrate integrated waveguide technology and featuring dual-band functionality, and dual circular polarization. The latter is achieved by means of a dual-band orthomode transducer. An extended hemispherical dielectric lens ensures good matching and radiation properties. The feed structure is composed of a multilayer printed circuit board and tapered superstrates. The design procedure of the components is explained in detail and three different variants of the antenna are compared. The measured scattering and far-field parameters validate the concept.

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Rehman, Masood, Perumal Nallagownden, and Zuhairi Baharudin. "Efficiency investigation of SS and SP compensation topologies for wireless power transfer." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 2157. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp2157-2164.

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<span>Wireless power transfer (WPT) using inductive and resonant coupling has been widely explored in recent years for ease and safety over conventional cable charging systems. The efficiency of WPT systems is reducing drastically due to an increase in air-gaps and misalignment between transmitter (Tx) and receiver (Rx). Many circuit topologies have been analyzed to improve the efficiency of WPT system based on symmetrical coils. However, the circuit topologies have not been studied widely for unsymmetrical coils. This paper presents the investigation of two fundamental topologies i.e. Series-Series (SS) and Series-Parallel (SP) for unsymmetrical coils as well as symmetrical coils. Theoretical analysis of both the compensation topologies have been accomplished, then modeling of both the topologies have been done using two different combination of circular coils. In first case, two similar size coils have been designed and in second case transmitter coil of higher dimensions than receiver coil is designed. The efficiency of the system has been analyzed at multiple distances in both cases by integrating coil structure with the circuit. The overall result show that when Tx is bigger than Rx, the SP topology gives better efficiency than SS counterpart.</span>

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Sim, Sung-Chur, Matthew D. Robbins, Saranga Wijeratne, Hui Wang, Wencai Yang, and David M. Francis. "Association Analysis for Bacterial Spot Resistance in a Directionally Selected Complex Breeding Population of Tomato." Phytopathology® 105, no. 11 (November 2015): 1437–45. http://dx.doi.org/10.1094/phyto-02-15-0051-r.

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Bacterial spot of tomato is caused by at least four species of Xanthomonas with multiple physiological races. We developed a complex breeding population for simultaneous discovery of marker-trait linkage, validation of existing quantitative trait loci (QTL), and pyramiding of resistance. Six advanced accessions with resistance from distinct sources were crossed in all combinations and their F1 hybrids were intercrossed. Over 1,100 segregating progeny were evaluated in the field following inoculation with X. euvesicatoria race T1 strains. We selected 5% of the most resistant and 5% of the most susceptible progeny for evaluation as plots in two subsequent replicated field trials inoculated with T1 and T3 (X. perforans) strains. The estimated heritability of T1 resistance was 0.32. In order to detect previously reported resistance genes, as well as novel QTL, we explored methods to correct for population structure and analysis based on single markers or haplotypes. Both single-point and haplotype analyses identified strong associations in the genomic regions known to carry Rx-3 (chromosome 5) and Rx-4/Xv3 (chromosome 11). Accounting for kinship and structure generally improved the fit of statistical models. Detection of known loci was improved by adding kinship or a combination of kinship and structure using a Q matrix from model-based clustering. Additional QTL were detected on chromosomes 1, 4, 6, and 7 for T1 resistance and chromosomes 2, 4, and 6 for T3 resistance (P < 0.01). Haplotype analysis improved our ability to trace the origin of positive alleles. These results demonstrate that both known and novel associations can be identified using complex breeding populations that have experienced directional selection.

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Li, Liu, and Lin-Hua Xie. "Study of the Electron Paramagnetic Resonance Parameters for Copper Ions in Lead Titanate Crystal." Zeitschrift für Naturforschung A 66, no. 8-9 (September 1, 2011): 559–61. http://dx.doi.org/10.5560/zna.2011-0018.

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Abstract The electron paramagnetic resonance parameters (g factors g||, g⊥ and hyperfine structure constants A>||, A⊥) of PbTiO3: Cu2+ are calculated from the complete diagonalization method and the perturbation theory method. The calculated results obtained by the complete diagonalization method are close to that obtained by the perturbation theory method, and in good agreement with the experimental values. In the complete diagonalization method, the complete diagonalization procedure is established based on the 3d9 electron system in tetragonal field. From the calculation of the electron paramagnetic resonance parameters, the local defect structure of the [CuO6]-10 cluster can be determined as D4h with Rx = Ry = 0:1952 nm, Rz = 0:2076 nm.

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41

Jin, Chichuan, Chris Done, Martin Ward, and Emma Gardner. "Super-Eddington QSO RX J0439.6-5311 – II. Multiwavelength constraints on the global structure of the accretion flow." Monthly Notices of the Royal Astronomical Society 471, no. 1 (June 29, 2017): 706–21. http://dx.doi.org/10.1093/mnras/stx1634.

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Lu, Ting, David G. Gilbank, Michael L. Balogh, Martha Milkeraitis, Henk Hoekstra, Ludovic Van Waerbeke, David A. Wake, Alastair C. Edge, and Richard G. Bower. "Large-scale structure and dynamics of the most X-ray luminous galaxy cluster known - RX J1347−1145." Monthly Notices of the Royal Astronomical Society 403, no. 4 (April 21, 2010): 1787–800. http://dx.doi.org/10.1111/j.1365-2966.2010.16245.x.

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Blakeslee, John P., B. P. Holden, M. Franx, P. Rosati, R. J. Bouwens, R. Demarco, H. C. Ford, et al. "Clusters at Half Hubble Time: Galaxy Structure and Colors in RX J0152.7−1357 and MS 1054−03." Astrophysical Journal 644, no. 1 (June 10, 2006): 30–53. http://dx.doi.org/10.1086/503539.

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Wang, Duo, Raphaël Gillard, and Renaud Loison. "A 60 GHz passive repeater array with quasi-endfire radiation based on metal groove unit-cells." International Journal of Microwave and Wireless Technologies 8, no. 3 (March 3, 2016): 431–36. http://dx.doi.org/10.1017/s1759078716000234.

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This paper describes a linear-polarized reflector that reflects incident wave almost parallel to its surface at 60 GHz, when illuminated by an impinging plane wave with normal incidence. This structure is designed as a simple and low-cost passive repeater with both a quasi-endfire radiation and a flat profile. Working as a transmission relay, it is a quite potential and possible solution to improve the radio-coverage in the T-shaped corridor, which is a typical scenario of non-light-of-sight (NLOS) environment for 60 GHz indoor communications. The proposed repeater consists of an array of parallel grooves with appropriate depths, drilled in a metallic plate. Full-wave simulations and theoretical investigations are carried out to demonstrate the working principle and to optimize the performance. Then, an 80-groove breadboard in the size of 200 mm × 200 mm is fabricated and measured to explore the feasibility of the concept. In a practical measurement, when the distance from the repeater to transmitting antenna (Tx) is 2 m, and to the receiving antenna (Rx) is 1.5 m, the repeater exhibits a main beam at ±75° with gain up to 22.7 dB. The communication between Tx and Rx in NLOS areas is thus successfully recovered.

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Kang, Eunjung, Jun Hur, Chulhun Seo, Hojin Lee, and Hosung Choo. "High Aperture Efficiency Array Antenna for Wireless Power Transfer Applications." Energies 13, no. 9 (May 3, 2020): 2241. http://dx.doi.org/10.3390/en13092241.

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We propose a novel array antenna with high aperture efficiency by employing an array element operating in a high-order mode to improve the transmission efficiency of wireless power transmission applications. The proposed array element, operating at a frequency of 5.8 GHz, consists of a square patch with four metallic shorting pins, an extended cavity, and a high dielectric superstrate. The four metallic shorting pins derive the high-order operation, which can enhance the bore-sight gain, resulting in the high aperture efficiency of the array. The extended cavity structure can help further improvement the aperture efficiency and minimize the mutual coupling strength between adjacent elements. The proposed antenna element is extended to 2 × 2 and 4 × 4 arrays, resulting in aperture efficiencies of 74.2% and 80.5%, respectively. For the 2 × 2 array, maximum measured gains of 19.9 dBi in the zx-plane and 18.8 dBi in the zy-plane are observed. For the 4 × 4 array, the maximum measured gains of 24.3 dBi in the zx-plane and 24.5 dBi in the zy-plane are obtained in a full-anechoic chamber. Finally, the transmission efficiency of 6% with a distance of 0.8 m between the transmitter (Tx) and the receiver (Rx) is measured when setting up the wireless power transfer system, which consists of the Tx with the proposed 4 × 4 array and the Rx with a single element.

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Banerjee, Ritu, and James R. Johnson. "A New Clone Sweeps Clean: the Enigmatic Emergence of Escherichia coli Sequence Type 131." Antimicrobial Agents and Chemotherapy 58, no. 9 (May 27, 2014): 4997–5004. http://dx.doi.org/10.1128/aac.02824-14.

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ABSTRACTEscherichia colisequence type 131 (ST131) is an extensively antimicrobial-resistantE. coliclonal group that has spread explosively throughout the world. Recent molecular epidemiologic and whole-genome phylogenetic studies have elucidated the fine clonal structure of ST131, which comprises multiple ST131 subclones with distinctive resistance profiles, including the (nested) H30, H30-R, and H30-Rx subclones. The most prevalent ST131 subclone, H30, arose from a single common fluoroquinolone (FQ)-susceptible ancestor containing allele 30 offimH(type 1 fimbrial adhesin gene). An early H30 subclone member acquired FQ resistance and launched the rapid expansion of the resulting FQ-resistant subclone, H30-R. Subsequently, a member of H30-R acquired the CTX-M-15 extended-spectrum beta-lactamase and launched the rapid expansion of the CTX-M-15-containing subclone within H30-R, H30-Rx. Clonal expansion clearly is now the dominant mechanism for the rising prevalence of both FQ resistance and CTX-M-15 production in ST131 and inE. coligenerally. Reasons for the successful dissemination and expansion of the key ST131 subclones remain undefined but may include increased transmissibility, greater ability to colonize and/or persist in the intestine or urinary tract, enhanced virulence, and more-extensive antimicrobial resistance compared to otherE. coli. Here we discuss the epidemiology and molecular phylogeny of ST131 and its key subclones, possible mechanisms for their ecological success, implications of their widespread dissemination, and future research needs.

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QIU, AIMIN, and DONALD T. SAWYER. "The Electrochemical Evaluation of the Metal-Carbon Bond Energies (−ΔGBF) of Alkylated Iron and Cobalt Porphyrins [(por)M-R]." Journal of Porphyrins and Phthalocyanines 01, no. 02 (April 1997): 125–34. http://dx.doi.org/10.1002/(sici)1099-1409(199704)1:2<125::aid-jpp15>3.0.co;2-x.

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The electron-transfer oxidation-reduction chemistry for the alkyl derivatives of iron and cobalt porphyrins [( por ) M III − R ] has been characterized on the basis of cyclic voltammetric and controlled-potential-electrolysis measurements. The electrogenerated anions of iron and cobalt porphyrins [( por ) M − and ( por −·) M −] are strong nucleophiles that react with alkyl halides ( RX ) via a nucleophilic displacement process to form metal-carbon bonds [( por ) M - R and ( por −·) M - R ]. The difference in the reduction potentials for RX and ( por ) M II provides an approximate measure of the ( por ) M - R bond-formation free energy (−ΔG BF ). The −ΔG BF values for iron porphyrins (14–35 kcal mol−1) and for cobalt porphyrins (20-38 kcal mol−1) depend on the electron density of the porphyrin ring ( OEP > TPP > Cl 8 TPP > F 20TPP) and the structure of the alkyl group (1° > 2° > 3°). Thus, the apparent metal-carbon bond energy (−ΔG BF ) for ( OEP ) Fe III- Bu -n is 28 ± 2 kcal mol−1, and for [( MeO )4 TPP ] Co III- Bu -n is 36 ± 2 kcal mol −1. The ( por −·) M − dianions react with carbon dioxide in an electrocatalysed reduction cycle to give CO and CO 32− via the apparent transient formation of a metal-carbon bond [( por −·) M - C ( O ) O −; −Δ G BF ≥ 12 kcal mol −1 for iron porphyrins].

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Kim, Hyun-Woong, Minsik Ahn, Ockgoo Lee, Hyoungsoo Kim, Hyungwook Kim, and Chang-Ho Lee. "Analysis and Design of a Fully-Integrated High-Power Differential CMOS T/R Switch and Power Amplifier Using Multi-Section Impedance Transformation Technique." Electronics 10, no. 9 (April 26, 2021): 1028. http://dx.doi.org/10.3390/electronics10091028.

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In this paper, a new topology for a high-power single-pole-double-throw (SPDT) antenna switch is presented, and its loss mechanisms are fully analyzed. The differential architecture is employed in the proposed switch implementation to prevent unwanted channel formations of OFF-state Rx switch transistors by relieving the voltage swing over the Rx switch devices. In addition to that, the load impedance seen by the Tx switch is stepped down to reduce the voltage swing even more, allowing the antenna switch to handle a high-power signal without distortions. To drop the switch operating impedance, two matching networks are required at the input and the output of the Tx switch, respectively, and they are carefully implemented considering the integration issue of the front-end circuitries. From the loss analysis of the whole signal path, an optimum switch operating impedance is decided in view of a trade-off between power handling capability and insertion loss of the antenna switch. The insertion loss of the proposed design is compared to the conventional design with electromagnetic (EM) simulated transformer and inductors. The proposed antenna switch is implemented in a standard 0.18 µm CMOS process, and all switch devices adopt the deep n-well structure. The measured performance of the proposed transmitter front-end chain shows a 1 dB compression point (P1dB) of 32.1 dBm with 38.3% power-added efficiency (PAE) at 1.9 GHz.

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Tangsrirat, Worapong. "Simple BiCMOS CCCTA Design and Resistorless Analog Function Realization." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/423979.

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Abstract:

The simple realization of the current-controlled conveyor transconductance amplifier (CCCTA) in BiCMOS technology is introduced. The proposed BiCMOS CCCTA realization is based on the use of differential pair and basic current mirror, which results in simple structure. Its characteristics, that is, parasitic resistance(Rx)and current transfer(io/iz), are also tunable electronically by external bias currents. The realized circuit is suitable for fabrication using standard 0.35 μm BiCMOS technology. Some simple and compact resistorless applications employing the proposed CCCTA as active elements are also suggested, which show that their circuit characteristics with electronic controllability are obtained. PSPICE simulation results demonstrating the circuit behaviors and confirming the theoretical analysis are performed.

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Coe, M. J., I. M. Monageng, E. S. Bartlett, D. A. H. Buckley, and A. Udalski. "A major optical and X-ray outburst from the Magellanic Bridge source RX J0209.6–7427." Monthly Notices of the Royal Astronomical Society 494, no. 1 (March 31, 2020): 1424–29. http://dx.doi.org/10.1093/mnras/staa823.

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ABSTRACT RX J0209.6–7427 is an X-ray source in the Magellanic Bridge that was first detected in 1993, but not seen again till 2019. It has been identified as a member of the Be/X-ray binary class, a category of objects that are well established as bright, often-unpredictable transients. Such systems are rarely known in the Bridge, possibly because they lie outside the area most commonly studied by X-ray telescopes. Whatever be the reason for the sparse number of such systems in the Bridge, they can provide useful tools for trying to understand the result of the tidal dynamics of the two Magellanic Clouds. In this paper, the nature of the object is explored with the help of new data obtained during the latest outburst. In particular, the first optical spectrum of the counterpart is presented to help classify the star, plus measurements of the Balmer emission lines over several years are used to investigate changes in the size and structure of the circumstellar disc.

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Journal articles on the topic 'Structure RX'

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