bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermoresponsive Macroporous Scaffolds Prepared by Emulsion Templating
Authors: Zhou Shengzhong , Bismarck Alexander , Steinke Joachim H. G. 
Published: August 2012

AbstractA versatile method to prepare non‐covalently crosslinked polyHIPEs hydrogels from oil‐in‐water high internal phase emulsions (HIPEs) whose aqueous phase contained thermo‐responsive linear polymers is described. The interconnected pore structure of the polyHIPEs is maintained by reversible physical aggregation of thermo‐responsive polymer chains in an aqueous environment. This method to prepare interconnected porous hydrogels using a thermal trigger in the guise of thermo‐responsive polymers by emulsion templating requires no chemical reaction during solidification of the template. This particular feature could provide a safer route to injectable scaffolds as issues of polymerisation/crosslinking chemistry and residual initiator fragments or monomers do not arise
Phase noise formula for dual‐resonance injection‐locked frequency dividers
Authors: Jang Sheng‐Lyang , Huang Jhin‐Fang , Chang Chia‐Wei 
Published: August 2012

AbstractThis letter develops a phase noise formula for injection‐locked frequency dividers (ILFDs) implemented with dual‐resonance LC tank, which consists of a series LC resonator and a parallel LC resonator. In parallel‐tuned single‐resonance ILFD, the output phase noise is set by the noise of the injection signal at low frequency offset from the carrier, while it can be dominated by the divider noise at large frequency offset. The developed theory shows that the phase noise equations of a series‐tuned single‐resonance ILFD and dual‐resonance ILFDs has a common phase noise equation as the one used for a single‐resonance parallel‐tuned ILFD. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2491–2494, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27105
High gain/power quotient variable‐gain wideband low‐noise amplifier for capsule endoscopy application
Authors: Iji Ayobami , Zhu Xi , Heimlich Michael 
Published: August 2012

AbstractAn implantable high gain/power quotient variable‐gain wideband low‐noise amplifier (LNA) suitable for capsule endoscopy application is implemented in a 0.25 μm silicon‐on‐insulator CMOS process. With a current‐reused topology and wideband matching network, the presented LNA exhibits peak gain of 13.8 dB, 2.3 dB noise figure, more than 1 GHz bandwidth and 5 dB gain tuning range with good input and output impedance matching. The LNA consumes only 1.8 mW DC power from a supply voltage of 1.5 V. An excellent average gain/power quotient of 6.8 dB/mW is achieved. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2563–2565, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27111
Spurious‐Free dynamic range of a high‐resolution photonic time‐stretch analog‐to‐digital converter system
Authors: Gee Caroline M. , Sefler George , DeVore Peter T.S. , Valley George C. 
Published: August 2012

AbstractWe measure the spurious‐free dynamic range (SFDR) for a 10‐GHz photonic time‐stretch ADC system. Unlike single‐octave microwave systems, the second‐order spurs limit the SFDR to 88 dB‐Hz1/2 at 10 GHz and 95 dB‐Hz1/2 at 1 GHz. Simulations that include modulator arm bias mismatch and equalization agree with experiments. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2558–2563, 2012; this online at wileyonlinelibrary.com. DOI 10.1002/mop.27114
Electrical modeling of photonic crystal defects
Authors: Patil Preeti B. , Pendharker Sarang , Shevgaonkar R. K. 
Published: August 2012

AbstractA transmission line model of a planar photonic crystal (PC) waveguide is presented here. Electrical characteristics of single and multiple point defects in a PC waveguide are investigated. It is shown that a point defect in the waveguide can be modeled as a reactance connected across the transmission line. Investigation shows that depending on the size and refractive index, a point defect can be inductive or capacitive and its reactance can vary over a wide range. A double defect behaves as a bandpass filter. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2522–2528, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27115
In situ characterization of pin diode waveforms using electro‐optic sampling
Authors: Benabe Evelyn , Crites Matthew H. , Whitaker John F. , Weller Thomas M. 
Published: August 2012

AbstractIn situ measurements of nonlinear waveforms produced by a PIN diode under large‐signal excitation have been performed using ultrafast electro‐optic (EO) sampling.The waveforms were sampled using an EO probe positioned immediately after the diode. These data validate a nonlinear model and improve representation of the waveform across the circuit. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2653–2656, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27119
Broadband coupled‐line balun on a defected ground structure
Authors: Kim M. 
Published: August 2012

AbstractA novel microstrip balun topology based on common‐mode rejection is introduced. The balun is constructed with a short section of coupled line placed above a defected ground structure. Measurements on a PCB sample indicate a successful conversion from single end to differential mode showing 0.7 dB of insertion loss at 3 GHz along with 1‐dB bandwidth that extends from 0.7 to 5.6 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2575–2577, 2012; this online at wileyonlinelibrary.com. DOI 10.1002/mop.27120
Geometrically distributed one‐dimensional photonic crystals for all angle optical filters
Authors: Teeka C. , Pipatsart S. , Yupapin P. P. 
Published: August 2012

AbstractWe present the general formulation of light reflection using a series of one‐dimensional (1D) photonic crystals (PCs) with different periods, which is made of nonabsorptive materials of any refractive indices.To have a large bandgap, the spectral range of reflection, the periods of 1D PCs must be distributed in a geometrical progression with a common ratio, r, smaller than a maximum value of rc. In this letter, the exact expressions for rc, the bandgap to mid gap ratio of the PC heterostructure and the minimum number of PCs to achieve the desired range of bandgap in single and all angles of incidence have been presented. The proposed method can be used to design the optical filters for vast range of applications such as ultraviolet (UV) filters (i.e., sunglasses, eye safety glasses, UV photography filters) and visible light filters. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2533–2536, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27123
Photon‐pair states and violation of CHSH inequality
Authors: Martins Luís P. , Almeida Álvaro J. , André Paulo S. , Pinto Armando N. 
Published: August 2012

AbstractIn addition to Bell's original inequality, John Clauser, Michael Horne, Abner Shimony, and Richard Holt (CHSH) developed a special form of Bell's inequality which gives classical limits to the expected correlation between two particles. We present a theoretical demonstration of the maximum value for violation of CHSH inequality, S = 2
$\sqrt{2}$, for the pure entangled quantum state. Using the spontaneous four‐wave mixing process, we generate polarization‐entangled photon pairs in a highly nonlinear fiber (HNLF) loop, for experimental verification. Using a nonentangled quantum state, we show theoretically that the violation of CHSH inequality is only a property of entangled states. We also show the theoretical solution of violation of the CHSH inequality for a general Greenberger–Horne–Zeilinger state and for an arbitrary state of two particles. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2454–2461, 2012; View this article online at wileyonlinelibrary. com. DOI 10.1002/mop.27127
Miniaturized leaf‐shaped monopole antenna with filtering properties
Authors: Ahdi Rezaeieh Sasan , Kartal Mesut 
Published: August 2012

AbstractA miniaturized monopole antenna design with filtering properties is presented.The proposed antenna has a leaf‐shaped radiating patch, which enhances antenna with larger current path leading to wider impedance matching bandwidth in lower frequencies. By creating two ellipse‐shaped slots with the same radiuses on the radiating patch and locating a parasitic circle on the opposite side, a band‐stop property is obtained. Its band‐stop characteristic is controlled by changing the slots' length and circle's radius. The designed antenna has a small size of 20 × 20 × 1 mm3 while showing the band rejection performance in the frequency range of 4.2–7.2 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2638–2642, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27131
Embroidered wearable antenna for ultrawideband applications
Authors: Sim Chow‐Yen‐Desmond , Tseng Chih‐Wei , Leu Hoang‐Jyh 
Published: August 2012

AbstractAn electroconductive polyester yarn is used to fabricate an embroidered wearable monopole antenna for ultrawideband applications.Here, the structure of this embroidered antenna is a common coplanar waveguide‐fed circular disk monopole antenna. From the experimental results, a 10‐dB impedance bandwidth from 2.7 to 10.62 GHz is measured, while steady gains with near omnidirectional radiation patterns are exhibited within the bands of interest. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2597–2600, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27133
A cylindrical resonant cavity to evaluate the chemical and biological effects of low‐power RF electromagnetic fields
Authors: Maxia P. , Casula G. A. , Mazzarella G. , Montisci G. , Gaudiomonte F. , Carta R. , Desogus F. 
Published: August 2012

AbstractA resonant cavity, used to evaluate the effects of the exposition of biological materials or aqueous‐organic mixtures to low‐power electromagnetic fields at microwave frequencies, is presented.The cavity resonator has been designed using CST microwave studio, and then manufactured. The simulations show a very good agreement with measured data. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2566–2569, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27135
Dual‐resonance compact circularly polarized reader antenna for UHF RFID applications
Authors: Tang Zhi‐jun , Zhan Jie , Liu Hong‐li 
Published: August 2012

AbstractA novel dual‐resonance ultrahigh frequency radiofrequency identification reader antenna at 868 or 915 MHz is proposed which has a square metal patch with two truncated corners, four inserted slits of equal lengths, a circular slot, and a substrate with two rectangular slots. The antenna achieves 70 MHz bandwidths, 3.7 dBi gains, and a good radiation pattern. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2531–2533, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27136
Design of high‐isolation Ka‐band switch using coupled lines
Authors: Jeong Jinho , Kwon Youngwoo 
Published: August 2012

AbstractIn this letter, new design of a high‐isolation switch is presented at Ka‐band.To improve the isolation performance of the conventional absorptive‐type switch, coupled lines with variable characteristic impedance are used. The coupled line acts as a transmission line of which the characteristic impedance is controlled depending on the state of the switch. In the on‐state, its characteristic impedance is determined to be the same as the reference impedance for good insertion and return losses. In the off‐state, it is adjusted to be higher than the reference impedance, which reduces the signal leakage to the output, achieving high isolation. In this way, the proposed switch can provide good insertion and isolation performance with good return losses in both states. The proposed idea is verified by the measurement of Ka‐band switch microwave monolithic integrated circuits fabricated in 0.15 μm GaAs pHEMT process. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2528–2530, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27137
K‐band watt‐level mHEMT power amplifier using quadruple‐stacked transistors
Authors: Park Youngrak , Kim Youngmin , Koh Yumin , Kim Jihoon , Seo Kwangseok , Jeong Jinho , Kwon Youngwoo 
Published: August 2012

AbstractA broadband watt‐level power amplifier in a metamorphic high electron mobility transistor (mHEMT) technology is presented at K‐band. The quadruple‐stacked transistor is used to overcome the low breakdown voltage limit of mHEMTs and achieve watt‐level output powers. The fabricated power amplifier using 130‐nm mHEMTs shows an output power of 1.3 W at 18 GHz with a 3‐dB power bandwidth of 58%. To the best of our knowledge, this is the first report of watt‐level single‐chip power amplifiers in mHEMT technology. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2624–2626, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27140
Wideband multilayer multi‐permittivity half‐split cylindrical dielectric resonator antenna
Authors: Chaudhary Raghvendra Kumar , Srivastava Kumar Vaibhav , Biswas Animesh 
Published: August 2012

AbstractIn this article a wideband multilayer multipermittivity (MLMP) half‐split cylindrical dielectric resonator antenna (CDRA) fed through coaxial probe is proposed and developed. The idea of multilayers of different permittivity is introduced in half‐split dielectric resonator antenna for getting wide bandwidth. A parametric study is performed to optimize the antenna performance. The proposed MLMP half‐split CDRA is excited with TM21δ (0 < δ < 1) mode. The proposed wideband MLMP half‐split CDRA provides measured percentage input impedance bandwidth of 63.7% which covers the frequency range of 4.05–6.9 GHz. The simulated and measured radiation patterns are consistent throughout the operational bandwidth. The average measured gain over the band is 5.79 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2587–2590, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27141
New equivalent continuously tunable high‐resolution microwave photonic bandpass filter
Authors: Chan Erwin H. W. 
Published: August 2012

AbstractA new technique for implementing an equivalent continuously tunable high‐resolution microwave photonic bandpass filter is presented.It is based on applying frequency conversion to the RF signal before and after high‐resolution bandpass filtering. Experimental results are presented, which demonstrate the continuously tuning of a high‐resolution microwave photonic bandpass filter. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2584–2587, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27142
A miniature and low‐power 24 GHz CMOS VCO using tunable lc source‐degeneration and transformer feedback techniques for automotive radars
Authors: Lin Yo‐Sheng , Yu Po‐Wei 
Published: August 2012

AbstractA 24 GHz voltage‐controlled oscillator (VCO) using tunable LC source‐degeneration and transformer‐feedback techniques for automotive radar systems is demonstrated in a standard 0.18 μm CMOS process. The tunable LC source‐degeneration is made by adding two tunable LC tanks, which use varactors as the needed capacitors, to the source terminals of the cross‐coupled transistor pair of the VCO. Compared with the traditional cross‐coupled transistor pair, the equivalent parallel capacitance (CEQ) can be significantly decreased. This in turn results in the increase of both the operation frequency and the tuning range of the VCO. In addition, a differential‐to‐differential spiral‐transformer‐shaped layout is adopted to realize the needed four inductors, that is, the two drain inductors and the two source inductors. This in turn results in the layout area and the power consumption of the VCO is minimized. The VCO core draws 7.2 mA current from a 0.85 V power supply, that is, it only consumes 6.12 mW. The VCO achieves a wide tuning range of 3.03 GHz, from 22.32 to 25.35 GHz. In addition, the VCO achieves a phase noise of −103 dBc/Hz at 1 MHz offset from 24 GHz. The corresponding figure‐of‐merit is −182.7 dBc/Hz, one of the best results ever reported for a K‐band CMOS VCO. The core circuit occupies a chip area of only 0.36 × 0.56 mm2, that is, 0.202 mm2. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2553–2558, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27143
Compact asymmetric‐slotted‐slit patch based circularly‐polarized antenna with reactive impedance surface substrate
Authors: Agarwal Kush , Nasimuddin  , Alphones A. 
Published: August 2012

AbstractA compact, asymmetric‐slotted‐slit‐microstrip patch, based antenna on a reactive impedance surface (RIS) is proposed and studied for the circularly polarized (CP) radiation.The antenna consists of a slotted‐slit‐microstrip patch on a RIS substrate. The CP radiation with compact size is achieved by asymmetric slots and slits cut along the diagonal and orthogonal directions of the patch radiator. The asymmetric slotted‐slit‐microstrip on the RIS structure is used for further miniaturization of the antenna with CP radiation. The measured results of the proposed antenna are 2.1% (2.625–2.68 GHz) for 3‐dB axial ratio bandwidth, 9.5% (2.575–2.82 GHz) for 10‐dB return loss bandwidth, and 3.87 dBic for gain at the boresight. The patch radiator size is 0.187 λ × 0.179 λ on a low cost FR4 substrate at 2.6 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2505–2510, 2012; this online at wileyonlinelibrary.com. DOI 10.1002/mop.27147
Fock's integral and Pekeris's integral calculation for diffraction on dielectric convex surface
Authors: Legendre J. F. , Marsault T. , Landouer G. , Cueff D. 
Published: August 2012

AbstractThis note describes a complete mathematical method to compute Fock's integral or Pekeris's integral that appears in diffraction coefficient on dielectric convex surface proposed by Pathak [Radio Sci 14 (1979), 419–435]. Our solution is valid in all space above surface. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2464–2468, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27149
Design of log‐periodic dipole array inspired antenna with very wide bandwidth
Authors: Salmani Zeeshan , Zhang Hualiang 
Published: August 2012

AbstractA parallel‐strip line fed antenna with very wide bandwidth is presented in this article. This wideband antenna is designed as a combination of two individual antenna elements that are connected in a way inspired by the log‐periodic antenna array technique. To miniaturize the size of the structure, metamaterial‐based antennas are used as the basic radiating elements. The proposed antennas are designed on FR4 substrate and measured results show that it has a very wide bandwidth from 0.68 to 120 GHz with a VSWR < 3 for frequency range from 0.68 to 3.2 GHz and VSWR < 2 for the remaining bandwidth, with relative stable radiation characteristics. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2646–2650, 2012; this online at wileyonlinelibrary.com. DOI 10.1002/mop.27150
Metamaterial‐based fabry–perot resonator for ultra‐low profile high‐gain antenna
Authors: Li Long , Lei Shuo , Liang Chang‐Hong 
Published: August 2012

AbstractIn this letter, we report the design, fabrication, and measurement of a metamaterial‐based Fabry–Perot (F–P) resonator antenna. The F–P resonator antenna is constructed of a fishnet superstrate and a printed patch antenna based on a mushroom‐like electromagnetic bandgap substrate. Simulated and measured results show that the proposed F–P resonator antenna achieves an ultra‐low profile as well as a high‐gain enhancement. The thickness of the metamaterial‐based F–P resonator is only λ/125. Compared to the traditional superstrate patch antenna, the forward gain of the new metamaterial F–P resonator antenna is enhanced and the back radiation is suppressed effectively. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2620–2623, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27155
Non‐spin‐echo 3D transverse hadamard encoded proton spectroscopic imaging in the human brain
Authors: Cohen Ouri , Tal Assaf , Goelman Gadi , Gonen Oded 
Published: August 2012

AbstractA non‐spin‐echo multivoxel proton MR localization method based on three‐dimensional transverse Hadamard spectroscopic imaging is introduced and demonstrated in a phantom and the human brain. Spatial encoding is achieved with three selective 90° radiofrequency pulses along perpendicular axes: The first two create a longitudinal ±MZ Hadamard order in the volume of interest. The third pulse spatially Hadamard‐encodes the ±MZs in the volume of interest in the third direction while bringing them to the transverse plane to be acquired immediately. The approaching‐ideal point spread function of Hadamard encoding and very short acquisition delay yield signal‐to‐noise‐ratios of 20 ± 8, 23 ± 9, and 31 ± 10 for choline, creatine, and N‐acetylaspartate in the human brain at 1.5 T from 1 cm3 voxels in 21 min. The advantages of transverse Hadamard spectroscopic imaging are that unlike gradient (Fourier) phase‐encoding: (i) the volume of interest does not need to be smaller than the field of view to prevent aliasing; (ii) the number of partitions in each direction can be small, 8, 4, or even 2 at no cost in point spread function; (iii) the volume of interest does not have to be contiguous; and (iv) the voxel profile depends on the available B1 and pulse synthesis paradigm and can, therefore, at least theoretically, approach “ideal” “1” inside and “0” elsewhere. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.
Working with borderline personality disorder: A small‐scale qualitative investigation into community psychiatric nurses' constructs of borderline personality disorder
Authors: Stroud James , Parsons Rachel 
Published: August 2012

ABSTRACTBorderline personality disorder (BPD) is a complex presentation that can have a significant impact upon the individual and on his or her quality of life. BPD has often been associated with negative connotations (e.g. ‘manipulative’, ‘attention seeking’). The aim of the current study was to gain a fuller understanding of how community psychiatric nurses (CPNs) make sense of the diagnosis of BPD and how their constructs of BPD impact their approach to this client group. Four CPNs, three women and one man, were interviewed using a semi‐structured interview schedule. The data were analysed using interpretative phenomenological analysis, to reveal over‐arching and sub‐themes. The results indicated that participants attempted to ascribe meaning to the client's presentation ‘in the moment’. When they had a framework to explain behaviour, participants were more likely to express positive attitudes. When they did not have such a framework, participants could view clients in more pejorative terms. As participants were deriving meaning ‘in the moment’, there could be fluidity with regards to participants' attitudes, ranging from ‘dread’ to a ‘desire to help’. This could lead to participants shifting between ‘connected’ and ‘disconnected’ interactions with clients. The limitations and implications for clinical practise will also be considered. Copyright © 2012 John Wiley & Sons, Ltd.