bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of high efficiency rectifier at 2.45 GHz using parasitic canceling circuit
Authors: Kim Jungsik , Jeong Jinho 
Published: January 2013

AbstractIn this article, high efficiency rectifiers using parasitic canceling circuits are presented at 2.45 GHz. Input matching circuit and DC filter, which are the basic sub‐blocks of rectifiers, are designed for high efficiency operation. Then, the parasitic canceling circuit is designed and inserted between the rectifying diode and DC filter such that the parasitic elements of the diode is properly canceled out to minimize the harmonic generations and maximize the efficiency. For this purpose, the equivalent circuit of the diode is extracted, and the impedances seen by the intrinsic diode resistance are investigated at harmonic frequencies. To verify the suggested idea, two rectifiers with parasitic canceling circuits are demonstrated at 2.45 GHz, that is, low power rectifier (LP rectifier) which is optimally designed for low input power (lower than 0 dBm), and high power rectifier (HP rectifier) for high input power (higher than 0 dBm). The measurement of LP rectifier shows efficiency of 60% at the input power of 0 dBm. The HP rectifier achieves the maximum efficiency of 72% at the input power of 10 dBm. Both results belong to the excellent performance among the reported rectifiers at the same frequency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:608–611, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27381
Novel dual‐mode circular patch bandpass filter using CSRR slot‐type perturbation
Authors: Shi Xinrong , Liu Yuan'an , He Qing , Gu Liangjie , Liu Hongtao Zhang Fang , Liu Kaiming 
Published: January 2013

AbstractA slot‐type complement split‐ring resonator (CSRR) as a new type of perturbation element for dual‐mode circular patch resonator is proposed in this letter.The slot‐type CSRR used in the patch resonator perturbs the field distributions of circular patch resonators and excites degenerate modes. By changing the orientations of the CSRRs, coupling characteristics can be adjusted. The proposed dual‐mode bandpass filters are designed, fabricated, and measured. The simulation results of proposed bandpass filter are in good with the measurement ones. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:666–670, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27386
Millimeter‐wave phase shifter based on waveguide‐mounted RF‐MEMS
Authors: Psychogiou Dimitra , Li Yunjia , Hesselbarth Jan , Kühne Stephane , Peroulis Dimitrios , Hierold Christofer , Hafner Christian 
Published: January 2013

AbstractA continuously variable transmission type W‐band phase shifter based on a single pole bandpass filter tuned by MEMS actuated fingers is reported. Tuning is achieved by means of two half‐wavelength long conductive fingers that synchronously rotate upwards in an antiparallel fashion. The fingers deflection results in a distributed variable shunt capacitance which in turn leads to a variable analog phase shift. For an applied DC bias voltage between 0 and 26 V, the transmission phase can be continuously varied up to 46.4° at a frequency of 106 GHz with an insertion loss of less than 3.4 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:465–468, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27390
Optical generation of microwave passband signals
Authors: Dastmalchi Mansour , LaRochelle Sophie 
Published: January 2013

AbstractWe investigate generation of microwave passband signals with a tunable central frequency using optical up‐conversion. We consider systems without and with optical fiber transmission links. The technique performs photodetection of optically filtered gain switched laser pulses. Using appropriate electrical filters, we demonstrate up‐conversion centered at 25, 35, and 45 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:656–660, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27392
A 218‐GHz second‐harmonic multiquantum well GaAs‐based planar Gunn diodes
Authors: Khalid A. , Li Chong , Papageorgiou V. , Pilgrim N. J. , Dunn G. M. , Cumming D. R. S. 
Published: January 2013

AbstractWe present a multiquantum‐well channel GaAs‐based planar Gunn diode. By introducing extra channels, the output RF power has been significantly improved compared to single‐channel GaAs‐based planar Gunn diodes. For a 1.14 μm length and 60 μm wide device, the highest power achieved was approximately −4 dBm operating in fundamental mode at 109 GHz, and −26.6 dBm at its second harmonic at 218 GHz. The DC‐to‐RF conversion efficiency was ∼0.3% for the fundamental mode of oscillation. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:686–688, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27393
Measurement of active power using fiber bragg grating and a piezo‐electric transducer
Authors: Cheng Chin‐Hsing , Chang Min‐Chih , Liu Wen‐Fung 
Published: January 2013

AbstractThis article develops an optical fiber sensor using fiber Bragg grating (FBG) and a piezo‐electrical transducer (PZT) to measure active power.Mounting an FBG on a PZT bar, a dynamic strain simulator was constructed. The equivalent voltage produced by active power applied to the PZT was converted to the dynamic variation of the FBG Bragg wavelength. The active power was attained by measuring the changing value of the wavelength. Thus, the sensor can be used to measure active power without the use of a traditional power meter. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:682–686, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27394
Compact configurations of hexagonal microstrip antennas
Authors: Ray K. P. , Pandey M.D. , Rashmi R. , Duttagupta S. P. 
Published: January 2013

AbstractThis article proposes compact configurations of hexagonal microstrip antennas (HMSA). The hexagonal microstrip antenna is modified by shorting along the zero potential line, perpendicular to the feed axis resulting in shorted half‐hexagonal and quarter‐HMSA for the two feed configurations along X and Y axes. The fundamental principle is to keep the field distribution same so that the resonance frequency remains unaltered while achieving a compact footprint. The area reduces by a factor of four, for the quarter patch, while maintaining approximately the same resonance frequency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:604–608, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27396
A slot antenna with magnetoelectric elements
Authors: Petrov Roman V. , Murthy Devata V. B. , Sreenivasulu Gollapudi , Srinivasan Gopalan 
Published: January 2013

AbstractA ferrite–ferroelectric bilayer is used in a slot antenna for static magnetic and electric field control of the radiation characteristics of the antenna. A π‐type slot antenna with the resonance frequency ranging from 1.5 to 2.7 GHz, depending on the slot length, is studied. A bilayer of yttrium iron garnet (YIG) on gadolinium gallium garnet bonded to lead zirconate titanate (PZT) is used as the magnetoelectric element. Under a static magnetic field H corresponding to the ferromagnetic resonance in the YIG film, a substantial increase in the power transmitted by the antenna is measured. A dc electric field applied to PZT results in a phase shift of the radiated signal, by 220° for 200 V. The radiation patterns of the antenna show directional characteristics. The demonstrated electric and magnetic field control of antenna characteristics is of interest for applications in phased arrays and beam‐forming antennas. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:533–535, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27398
Manifestations of interpersonal dependency and depressive subtypes in outpatient psychotherapy patients
Authors: Huprich Steven , Rosen Alexandra , Kiss Andrea 
Published: January 2013

ABSTRACTThe present study investigated the relationship between normative and pathological dependency and anaclitic and introjective depressive experiences among 71 patients participating in outpatient psychotherapy at a university‐based psychology clinic. We examined the interrelationships among the Relationship Profile Test subscales, the Depressive Experiences Questionnaire subscales and the Outcome Questionnaire‐45.2. Results indicated that destructive overdependence was positively correlated with anaclitic and introjective depression and negatively correlated with overall perceptions of mental health. Dysfunctional detachment was positively correlated with introjective depression and negatively correlated with generalized perceptions of one's own mental health. Healthy dependency was negatively correlated with introjective depression and positively correlated with mental health. These results not only support the construct validity of the Relationship Profile Test but also shed light on a link between depression, dependence and self‐criticism. Copyright © 2013 John Wiley & Sons, Ltd.
Psychiatric manifestations, personality traits and health‐related quality of life in cancer of unknown primary site
Authors: Hyphantis Thomas , Papadimitriou Ilias , Petrakis Dimitrios , Fountzilas George , Repana Dimitra , Assimakopoulos Konstantinos , Carvalho André F. , Pavlidis Nicholas 
Published: January 2013

AbstractObjectivePsychiatric manifestations and personality traits are known to influence cancer patients. We aimed to assess psychological distress symptoms, psychosocial factors and health‐related quality of life (HRQoL) in cancer of unknown primary site (CUP) and to test whether these parameters differ between CUP and Metastatic (MKPC) or Non‐Metastatic Known Primary Cancers (N‐MKPC) after controlling for demographics and clinical variables.MethodsIn this cross‐sectional study, we recruited 50 CUP, 264 N‐MKPC and 52 MKPC participants. We assessed depressive symptoms (Center for Epidemiologic Studies‐Depression [CES‐D]), psychological distress symptoms (Symptom Distress Checklist‐90 Revised), sense of coherence (SOC), ego defense mechanisms (Life Style Index) and HRQoL (World Health Organization Quality of Life Instrument, Short Form).ResultsThe prevalence of clinically significant depressive symptoms (CES‐D ≥ 23) was 40.0% in CUP, 28.8% in MKPC and 23.5% N‐MKPC (p = 0.037). Multivariate logistic regression analysis showed that N‐MKPC patients were 5 times less likely (p = 0.028) and MKPC patients 3.3 times less likely (p = 0.05) to be assessed with probable depression compared with CUP patients after controlling for the major demographic and clinical variables studied. CUP patients presented also higher levels of somatization, anxiety and depressive symptoms; they also had more impaired Physical (p = 0.005), Mental (p = 0.041) and Social Relations (p = 0.044) HRQoL, along with lower scores on SOC and intellectualization defense and higher scores on repression defense, compared with MKPC and N‐MKPC patients.ConclusionsThese findings suggest that psychiatric manifestations are frequent in CUP, and the patients' resources to cope with the burden of their illness are limited. Attention to CUP patients' psychological distress and coping resources and capacities may enable oncologists to identify and manage modifiable aspects of HRQoL. Copyright © 2013 John Wiley & Sons, Ltd.
Ridge waveguide InGaN/GaN quantum dot edge emitting visible lasers
Authors: Banerjee Animesh , Frost Thomas , Jahangir Shafat , Stark Ethan , Bhattacharya Pallab 
Published: January 2013

AbstractBlue‐emitting and green‐emitting laser heterostructures were grown by molecular beam epitaxy, incorporating InGaN/GaN quantum dots as the active medium, with a measured quantum efficiency of 60% on n‐GaN bulk substrates. These quantum dots exhibit no S‐shape in the photoluminescence peak wavelength as a function of temperature, as typically found in comparable quantum well devices. The lasers were characterized by a threshold current density, Jth, of 930 A/cm2 under pulsed bias, with a differential efficiency of 13.9%, and a wall plug (power conversion) efficiency of 0.4% at 1050 A/cm2. Green‐emitting quantum dot lasers have Jth = 935 A/cm2. The lasers were also characterized by their modal properties through near field imaging (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Growth process and morphology of three‐dimensional GaSb islands on Ga/Si(111)
Authors: Hara Shinsuke , Machida Ryuto , Yoshiki Keisuke , Irokawa Katsumi , Miki Hirofumi , Kawazu Akira , Fujishiro Hiroki I. 
Published: January 2013

AbstractThe growth process and morphology of three‐dimensional GaSb islands grown on a Ga/Si(111)‐√3 × √3 reconstructed surface have been studied by ultrahigh‐vacuum scanning tunneling microscopy and non‐contact atomic force microscopy. Faceted GaSb islands with a density of 1011 cm−2 are formed on Ga/Si(111) in multilayer growth at 350 °C. Hexagonal‐ and pyramid‐shaped islands are formed at 400 °C. Dome‐shaped islands, which are similar to the islands grown on clean Si(111), are only formed at 450 °C. The growth morphology of GaSb islands varies depending on the atomic species terminated on Si(111) and the growth temperature. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
An observational study of an arctic front during he IPY‐THORPEX 2008 campaign
Authors: Mc Innes Harold , Kristjánsson Jón Egill , Rahm Stephan , Røsting Bjørn , Schyberg Harald 
Published: January 2013

AbstractThe fact that severe weather associated with polar lows and arctic fronts still comes unforeseen and puts human life at risk shows that an effort towards increased understanding of them is required. The observations of an arctic front by dropsondes and Doppler lidar carried onboard a research aircraft during the IPY‐THORPEX ﬁeld campaign offered a rare opportunity to investigate the mesoscale structure of the front and to validate the output from operational numerical weather prediction models. The observations revealed features similar to those of polar fronts such as a relatively steep frontal zone, the presence of a strong low‐level jet and an elevated dry slot, making the arctic front appear as a shallow cold front conﬁned to levels below 700 hPa. The dry slot indicated the presence of a downfolding of the tropopause, and together with the observations of an upper‐level jet this strongly supports the inclusion of an arctic tropopause fold connected to the arctic jet stream in a conceptual model of the tropopause. A comparison between data from operational numerical weather prediction models and observations obtained during the ﬂight shows that the models simulated the broad features of the frontal zone such as jets, dry slot and the depth of the front fairly well, although parts of the front were slightly misplaced. However, the models failed completely in their simulations of one of the three mesoscale cyclones associated with the front as they located it over the coast of northern Norway while the correct location was over the Greenland Sea according to the observations and analysis.
Polymeric Nanoparticles with Sequential and Multiple FRET Cascade Mechanisms for Multicolor and Multiplexed Imaging
Authors: Wagh Anil , Jyoti Faidat , Mallik Sanku , Qian Steven , Leclerc Estelle , Law Benedict 
Published: January 2013

AbstractThe ability to map multiple biomarkers at the same time has far‐reaching biomedical and diagnostic applications. Here, a series of biocompatible poly(d,l‐lactic‐co‐glycolic acid) and polyethylene glycol particles for multicolor and multiplexed imaging are reported. More than 30 particle formulations that exhibit distinct emission signatures (ranging from the visible to NIR wavelength region) are designed and synthesized. These particles are encapsulated with combinations of carbocyanine‐based fluorophores DiO, Dil, DiD, and DiR, and are characterized as <100 nm in size and brighter than commercial quantum dots. A particle formulation is identified that simultaneously emits fluorescence at three different wavelengths upon a single excitation at 485 nm via sequential and multiple FRET cascade events for multicolor imaging. Three other particles that display maximum fluorescence intensities at 570, 672, or 777 nm for multiplexed imaging are also identified. These particles are individually conjugated with specific (Herceptin or IgG2A11 antibody) or nonspecific (heptaarginine) ligands for targeting and, thus, could be applied to differentiate different cancer cells from a cell mixture according to the expressions of cell‐surface human epidermal growth factor receptor 2 and the receptor for advanced glycation endproducts. Using an animal model subcutaneously implanted with the particles, it is further demonstrated that the developed platform could be useful for in vivo multiplexed imaging.
Introduction
Authors: Minty Michiko G. , Zimmermann Frank 
Published: January 2013

AbstractParticle accelerators were originally developed for research in nuclear and high-energy physics for probing the structure of matter. Over the years advances in technology have allowed higher and higher particle energies to be attained thus providing an ever more microscopic probe for understanding elementary particles and their interactions. To achieve maximum benefit from such accelerators, measuring and controlling the parameters of the accelerated particles is essential. This is the subject of this book.
Cooling
Authors: Minty Michiko G. , Zimmermann Frank 
Published: January 2013

AbstractMany applications of particle accelerators require beam cooling, which refers to a reduction of the beam phase space volume or an increase in the beam density via dissipative forces. In electron and positron storage rings cooling naturally occurs due to synchrotron radiation, and special synchrotron-radiation damping rings for the production of low-emittance beams are an integral part of electron-positron linear colliders. For other types of particles different cooling techniques are available. Electron cooling and stochastic cooling of hadron beams are used to accumulate beams of rare particles (such as antiprotons), to combat emittance growth (e.g., due to scattering on an internal target), or to produce beams of high quality for certain experiments. Laser cooling is employed to cool ion beams down to extremely small temperatures. Here the laser is used to induce transitions between the ion electronic states and the cooling exploits the Dopper frequency shift. Electron beams of unprecedentedly small emittance may be obtained by a different type of laser cooling, where the laser beam acts like a wiggler magnet. Finally, designs of a future muon collider rely on the principle of ionization cooling. Reference [1] gives a brief review of the principal ideas and the history of beam cooling in storage rings; a theoretical dicussion and a few practical examples can be found in [2].
Collimation
Authors: Minty Michiko G. , Zimmermann Frank 
Published: January 2013

AbstractParticles at large betatron amplitudes or with a large momentum error constitute what is generally referred to as a beam halo. Such particles are undesirable since they produce a background in the particle-physics detector. The background arises either when the halo particles are lost at aperture restrictions in the vicinity of the detector, producing electro-magentic shower or muons, or when they emit synchrotron radiation that is not shielded and may hit sensitive detector components. In superconducting hadron storage rings, a further concern is localized particle loss near one of the superconducting magnets, which may result in the quench of the magnet, i.e., in its transition to the normalconducting state.
Longitudinal Phase Space Manipulation
Authors: Minty Michiko G. , Zimmermann Frank 
Published: January 2013

AbstractIn this chapter we describe various techniques used to control the longitudinal properties of particle beams We concentrate on the manipulation of the second moments of the longitudinal distribution; that is, on the bunch length and energy spread. As will be shown, the bunch length can be varied using accelerating cavities to compress, coalesce, split, and lengthen stored bunches. The energy spread of the beam can also be adjusted (usually to be a minimum) by proper phasing of the rf, by invoking cancellations between the applied and beam-induced rf, and by more sophisticated techniques for the case of long bunch trains. A practical application of the use of rf systems to affect the beam’s transverse emittance is presented lastly.
Optimization of Enzymatic Hydrolysis of Sacha Inchi Oil using Conventional and Supercritical Carbon Dioxide Processes
Authors: Prado Glaucia H. C. , Saldaña Marleny D. A. 
Published: January 2013

AbstractSacha inchi (Plukenetia volubilis) oil has high polyunsaturated fatty acids content. The hydrolysis of this oil is an efficient way to obtain desirable free fatty acids (FFA). The optimization of parameters was carried out according to the maximum production of FFA using two enzymatic hydrolysis processes. The effect of enzyme concentration (5–40 % based on weight of oil), temperature (40–60 °C), and oil:water molar ratio (1:5–1:70) were studied for the conventional enzymatic hydrolysis process, while pressure (10–30 MPa) and oil:water molar ratio (1:5–1:30) were studied for the enzymatic hydrolysis in supercritical carbon dioxide (SC‐CO2) media. The hydrolysis in SC‐CO2 media resulted in higher production of FFA (77.98 % w/w) at 30 MPa and an oil:water molar ratio equal to 1:5 compared to the conventional process (68.40 ± 0.98 % w/w) at 60 °C, oil:water molar ratio equal to 1:70, and 26.17 % w/w, enzyme/oil. The only significant parameter on the production of FFA for conventional enzymatic hydrolysis was enzyme concentration, while for the hydrolysis in SC‐CO2 media both pressure and the molar ratio of oil:water were significant. Lipid class analyses showed that with both methods, FFA, monoglycerides, and diglycerides content in the final product increased compared to pure oil, while triglycerides content decreased. Fatty acid composition analysis showed that the content of fatty acids in the FFA form were similar to their triglyceride form.
On the self-propulsion of an -sphere micro-robot
Authors: Vladimirov V. A. 
Published: January 2013

AbstractThe aim of this paper is to describe the self-propulsion of a micro-robot (or micro-swimmer) consisting of $N$ spheres moving along a fixed line. The spheres are linked to each other by arms with their lengths changing periodically. We use the asymptotic procedure containing the two-timing method and a distinguished limit. We show that self-propulsion velocity appears (in the main approximation) as a linear combination of velocities of all possible triplets of spheres. Velocities and efficiencies of three-, four- and five-sphere swimmers are calculated.
Co-rotating Taylor–Couette flow enclosed by stationary disks
Authors: Heise M. , Hoffmann Ch. , Will Ch. , Altmeyer S. , Abshagen J. , Pfister G. 
Published: January 2013

AbstractWe report results of a combined numerical and experimental study on axisymmetric and non-axisymmetric flow states in a finite-length, co-rotating Taylor–Couette system in the Taylor vortex regime but also in the Rayleigh stable regime for moderate Reynolds numbers (${\leq }1000$). We found the dominant boundary-driven axisymmetric circulation to play a crucial role in the mode selection and the bifurcation behaviour in this flow. A sequence of partially hysteretic transitions to other axisymmetric multi-cell flow states is observed. Furthermore, we observed spiral states bifurcating via a supercritical Hopf bifurcation out of these multi-cell states which strongly determine the shape of the spiral. Finally, an excellent agreement between experimental and numerical results of the full Navier–Stokes equations is found.