bluuebunny/crossref_metadata_2025_split huggingface dataset:
Efficient and high‐gain aperture coupled superstrate antenna arrays for 60 GHz indoor communication systems
Authors: Vettikalladi Hamsakutty , Coq Laurent Le , Lafond Olivier , Himdi Mohamed 
Published: July 2010

AbstractEfficient and high‐gain aperture coupled patch antenna arrays with superstrate at 60 GHz are studied and presented. It is noted that adding a superstrate with a specific size will induce a significant effect on antenna gain and radiation patterns. This capability is applied on the design of 2 × 2 and 4 × 4 arrays for high‐gain application. The maximum measured gain of a 2 × 2 superstrate antenna array is 16 dBi with an efficiency of 63%, which is 4 dB higher than that of a classical 2 × 2 array at 60 GHz. The 2:1 measured voltage standing wave ratio (VSWR) bandwidth is 6.8%. Also the maximum gain measured for a 4 × 4 superstrate antenna array is found to be 19.7 dBi with an estimated efficiency of 51%. The radiation patterns are found to be broadside all over the frequency band with very low back radiation. Hence aperture coupled superstrate antenna array is a good candidate for high‐efficient high‐gain application at 60 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2352–2356, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25455
An ultra‐wideband planar inverted‐F antenna
Authors: Chattha Hassan T. , Huang Yi , Lu Yang , Zhu Xu 
Published: July 2010

AbstractThe planar inverted‐F antenna (PIFA) is widely used in mobile and portable radio devices due to its excellent performance. However, it is not yet employed as an ultra‐wideband antenna due to its perceived narrow band characteristics. This article introduces a new PIFA for frequencies from about 3 GHz to 10 GHz, with a fractional bandwidth of about 100%, which is ideal for emerging ultra‐wideband (UWB) wireless applications. Simulated and measured results are provided to verify the conclusion. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2285–2288, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25458
An efficient CMOS power‐combining technique with differential and single‐ended power amplifier
Authors: Cho Eunil , Song Yonghoon , Lee Sungho , Park Joontae , Nam Sangwook 
Published: July 2010

AbstractThis article proposes an efficient power‐combining architecture with differential and single‐ended power amplifiers (PAs) in a CMOS process. The single‐ended amplifier is added for overall efficiency enhancement. To demonstrate this concept, a CMOS PA using the proposed architecture was fabricated with a 0.13‐μm CMOS technology that delivers 30.6 dBm of output power with 42% drain efficiency and 38% power‐added efficiency at 1.95 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2214–2217, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25460
Unconditionally stable LOD‐FDTD method based on the simplified sampling biorthogonal algorithm
Authors: Kong Ki‐Bok , Park Seong‐Ook 
Published: July 2010

AbstractThis letter presents an unconditionally stable locally one‐dimensional (LOD) finite‐difference time‐domain method based on the simplified sampling biorthogonal algorithm (SSB‐LOD). The suggested approach requires fewer arithmetic operations than in the SSB‐ADI scheme. This leads to a reduction of CPU time relative to the SSB‐ADI method while equivalent numerical accuracy is retained. The numerical implementation of two parallel conducting plate shows that the CPU time of the SSB‐LOD has been reduced to approximately 85% of that of the SSB‐ADI. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2183–2185, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25461
A new surface wave antenna‐based spoof surface plasmon mechanism
Authors: Shi Haofei , Wei Xingzhan , Zhao Zeyu , Dong Xiaochun , Lu Yueguang , Du Chunlei 
Published: July 2010

AbstractIn this letter, a surface wave antenna based on the excitation of spoof surface plasmon mode at microwave frequency is proposed and demonstrated experimentally to effectively modulate the far field radiation, by integrating with one‐dimensional subwavelength periodic corrugated grooves. Compared with the traditional surface wave antenna, the far field divergence of this spoof surface plasmon antenna exhibits a remarkable red shift. The numerical simulation and experimental data well accord with the predicted results given by grating scattering theory. Consequently, the surface wave antenna can be achieved with unique function and minimized in size by introducing spoof surface plasmon. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2179–2183, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25462
A semicircular band‐notch ultra‐wideband printed antenna based on CSRR
Authors: Yu Zhong‐Wu , Wang Guang‐Ming , Liang Jian‐Gang , Gao Xiang‐Jun 
Published: July 2010

AbstractIn this article, a semicircular band‐notch monopole antenna based on CSRR with band‐notch function is presented. A rectangular slit is cut at the top center of the ground to obtain desired operation frequency bandwidth, and a complementary split‐ring resonator is embedded in feed line to realize band‐notch function. Experiment results show that the proposed antenna has a sharp stop‐band of 4.89 GHz–6.12 GHz and one ultra‐wideband from 2 GHz to 12 GHz. During operated frequency band, the proposed antenna exhibits excellent radiation characteristics. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2387–2390, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25463
Active measurements of a mimo WiMAX‐OFDM based system in reverberation chambers
Authors: Belhouji Adil , Decroze Cyril , Carsenat David , Mouhamadou Moctar , Monediere Thierry 
Published: July 2010

AbstractElectromagnetic reverberation chambers can be used for multiple‐input multiple‐output (MIMO) systems testing.Currently, the tests focus on parameters such as correlation, diversity gain, efficiency, etc., by using a vector network analyzer. In contrast with these passive tests, a novel way of MIMO systems characterization is described in this article. It consists on evaluating bit error rate (BER) levels of a MIMO WiMAX‐OFDM system according to the Signal‐to‐Noise Ratio (SNR) by establishing an active link between the transmitter and the receiver. The measurement process is set up in a reverberation chamber, where multipath frequency selective channels are emulated. The obtained results are compared to a reference case with single‐input single‐output (SISO) to evaluate the real improvements made by the studied system. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2347–2352, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25465
A topology‐based multilevel scheme for fast integral‐equation methods
Authors: Wang Shumin , Duyn Jeff H. 
Published: July 2010

AbstractA topology‐based multilevel scheme is proposed for fast integral‐equation simulations. Low‐level subdomains are formed at first by exploring topological connectivity between basis functions. Profile reduction and quad‐tree image compression are then applied to construct a heuristic multilevel scheme from a symbolic rank map. Numerical results verified this approach and demonstrated its computational efficiency. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2195–2198, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25468
A near‐infrared optical fiber sensor for carbon monoxide concentration monitoring
Authors: Zhu Shanying , Chen Youping , Zhang Gang , Sa Jiming 
Published: July 2010

AbstractAn optical fiber sensor presented is capable of monitoring the presence of carbon monoxide (CO) in the exhaust environment.Conventional gas sensor used to detect CO concentration is often difficult to achieve high sensitivity, selectivity, and specificity in presence of a mixture of gases. The design of this sensor using DFB LD as light source and low‐cost near‐infrared components, which make it suitable for using in an exhaust environment, is discussed. The sensor based on spectrum absorption principle is immune to corrosion and poison as it consists of glass and ceramic parts. By using differential construction, it can eliminate the influence of common mode interfering signals caused by the wave of LDs light intension, thermal zero shift, and zero shift of photoelectric device. A national instrument cRIO‐9215 data acquisition card was used to acquire the output voltages and a LabView virtual instrument was used to store and process data. The response of the sensor to carbon dioxide supplied from the standard gas with dry nitrogen as a balancing gas in the laboratory was performed. The experimental results indicated that the sensor has been developed to operate within an exhaust environment and have high sensitivity and stability so it does not suffer from other gases interferences. The lower limit of detection for the sensor was found to be not less than 50 ppm for CO. This can be meeting the requirement of 100 ppm which is to be poisonous to human. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2192–2195, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25469
A monopole antenna with a magneto‐dielectric material and its MIMO application for 700 MHz‐LTE‐band
Authors: Shin Yong‐Sun , Park Seong‐Ook 
Published: July 2010

AbstractThis article presents an antenna with a magneto‐dielectric material and its MIMO application for LTE‐band.The proposed antenna is a folded monopole type and occupies a compact volume of 7.5 × 18.5 × 3.4 mm3. For reducing the size, obtaining the broad bandwidth, and enhancing the isolation performance, the magneto‐dielectric material is applied as a supporter. The parameters of the magneto‐dielectric material are ε′ − jε″= 3.29−j0.09 and μ′ − jμ″ = 2.01−j0.38 at 780 MHz. For evaluations of the MIMO application, the antenna has been measured in reverberation chamber. The Microwave Studio (MWS) is employed for optimizing the design parameters, and the simulated results are well agreed with those of the measured one. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2364–2367, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25470
Printed dipole antenna for WLAN applications
Authors: Sedghi S. , Nourinia J. , Ghobadi Ch. 
Published: July 2010

AbstractIn this article, a novel printed dipole antenna is presented for satisfying wireless local area network (WLAN) applications. The operating frequencies of the proposed antenna are 2.4/5.2/5.8 GHz, which covers WLAN system. Prototypes of the proposed antenna have been constructed and studied experimentally. The measured results show good agreement with the numerical prediction. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2327–2331, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25472
Quad‐band PIFA design for WLAN/satellite applications
Authors: Sim Chow‐Yen‐Desmond , Cheng Yu‐Ting 
Published: July 2010

AbstractThe design of a quad‐band planar inverted‐F antenna (PIFA) for IEEE 802.11 b/g/a WLAN applications and satellite communications system is proposed.To operate at the three resonant modes (2.4/5.2/5.8 GHz) for WLAN operations, a modified PIFA with a truncated corner and an embedded slit on the top rectangular‐shaped radiating element is initially introduced. To further achieve a wide 10 dB impedance bandwidth for satellite communications, a folded radiating element connected to the probe feed is inserted to the PIFA, which leads to a combined triple‐mode resonant frequency operating from 7.5 to 11.27 GHz. Detail procedure of developing this proposed antenna will be discussed, and the simulated data are provided to validate the measurement. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2331–2336, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25483
Compact microstrip‐fed ultra‐wideband antenna with novel radiating element
Authors: Naser‐Moghadasi M. , Koohestani Mohsen , Sadeghzadeh R.A. 
Published: July 2010

AbstractA novel printed monopole antenna with an ultra‐wide bandwidth is presented. The proposed antenna has very compact size (12 × 22 mm2) as well as very simple configuration and easily fed by using a 50 Ω microstrip line. The antenna impedance bandwidth based on S11 < −10 dB is from 3 to 14 GHz, about 130%. A stably omnidirectional radiation patterns over a wide bandwidth is obtained. These features will make the antenna attractive for modern ultra‐wideband applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2267–2269, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25486
Compact high‐gain printed loop‐antenna array integrated into a 5‐GHz WLAN access point
Authors: Hong Tzi‐Chieh , Su Saou‐Wen 
Published: July 2010

AbstractA printed, planar loop‐antenna array having a compact structure and high‐gain, directional radiation properties for WLAN operation in the 5 GHz band is presented. The antenna‐array design is composed of four‐folded loops arranged to be of 2 × 2 configuration, printed on both sides of a 1.6‐mm thick FR4 substrate, and one system printed circuit board (PCB) serving as an efficient reflector for the loops. The antenna array is set within the boundary of the PCB (size of 50 mm ×65 mm) and stacked there above by a separation distance of 5.4 mm only. That's, the design integrates the system PCB of an access point (AP) into an internal antenna solution for compact outdoor AP applications. The results show that good input matching with voltage standing wave ratio (VSWR) below 1.5 over the 5150–5825 MHz band can be achieved. Directional radiation patterns with peak gain at about 10 dBi were also obtained. Details of the antenna design are described and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2261–2267, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25487
Stacked Neural Network Modeling Applied to the Synthesis of Polyacrylamide‐Based Multicomponent Hydrogels
Authors: Leon Florin , Piuleac Ciprian George , Curteanu Silvia 
Published: July 2010

AbstractArtificial neural networks are a convenient method of modeling processes for which the analytical estimation is difficult or computationally intensive. Besides the performance on training data, the generalization capability of the resulting neural model is very important, especially for problems such as the one described in this paper, the synthesis of polyacrylamide‐based multicomponent hydrogels, because the prediction of the swelling degree are extremely useful in practice, because it can replace the experiments that necessitate a great amount of materials and time. In order to increase the generalization performance, we use stacked neural networks with a procedure of weight optimization, which prove to be a good choice regarding the accuracy of the results provided by the model.magnified image
Metric optimized gating for fetal cardiac MRI
Authors: Jansz Michael S. , Seed Mike , van Amerom Joshua F. P. , Wong Derek , Grosse‐Wortmann Lars , Yoo Shi‐Joon , Macgowan Christopher K. 
Published: July 2010

AbstractPhase‐contrast magnetic resonance imaging can be used to complement echocardiography for the evaluation of the fetal heart. Cardiac imaging typically requires gating with peripheral hardware; however, a gating signal is not readily available in utero. No successful application of existing technologies to human fetal phase‐contrast magnetic resonance imaging has been reported to date in the literature. The purpose of this work is to develop a technique for phase‐contrast magnetic resonance imaging of the fetal heart that does not require measurement of a gating signal. Metric optimized gating involves acquiring data without gating and retrospectively determining the proper reconstruction by optimizing an image metric. The effects of incorrect gating on phase contrast images were investigated, and the time‐entropy of the series of images was found to provide a good measure of the level of corruption. The technique was validated with a pulsatile flow phantom, experiments with adult volunteers, and in vivo application in the fetal population. Images and flow curves from these measurements are presented. Additionally, numerical simulations were used to investigate the degree to which heart rate variability affects the reconstruction process. Metric optimized gating enables imaging with conventional phase‐contrast magnetic resonance imaging sequences in the absence of a gating signal, permitting flow measurements in the great vessels in utero. Magn Reson Med, 2010. © 2010 Wiley‐Liss, Inc.
Sonnenenergienutzung hat noch Kapazitäten frei
Authors: Jung Udo 
Published: July 2010

AbstractHubert Schönberger, Udo Jung, Yves Willers, Christian HoffmannDie deutsche chemische Industrie kann vom wachsenden Photovoltaik‐Weltmarkt weiterhin profitieren, wenn sie die Technologieführerschaft bei Materialien der nächsten Solarzellengeneration anstrebt.
Lange bekannt – aber erfolgreich: die Pinakolumlagerung
Authors: Kirsch Stefan 
Published: July 2010

AbstractStefan F. KirschDie Pinakolumlagerung ist eine der ältesten Gerüstumlagerungen der organischen Chemie. Moderne Synthesestrategien integrieren sie als zentrales Element und nutzen so ihr hohes synthetisches Potenzial.
Der chemische Feldprediger
Authors: Wienhaus Otto , Marx Günter 
Published: July 2010

AbstractOtto Wienhaus, Günter MarxAus Anlass des 200. Geburtstages von Julius Adolph Stöckhardt, einem der wichtigsten Lehrmeister und Wegbereiter der praktischen Chemie im 19. Jahrhundert, veranstalten die TU Chemnitz und die TU Dresden im nächsten Jahr gemeinsam mit der GDCh wissenschaftliche Kolloquien.
Die Hans‐R.‐Jenemann‐Stiftung
Authors: Zörlein via Köhler 
Published: July 2010

AbstractIn den letzten 15 Jahren hat die Gesellschaft Deutscher Chemiker sechs Stiftungen eingerichtet, die sie treuhänderisch verwaltet.Diese unselbständigen gemeinnützigen Stiftungen fördern mit Auszeichnungen und Stipendien den wissenschaftlichen Nachwuchs auf unterschiedlichen Gebieten der Chemie.
Publizieren und verdienen
Authors: Bulmahn Maren 
Published: July 2010

AbstractMaren BulmahnWissenschaftliche Autoren sind Urheber geistigen Eigentums. Sie profitieren davon, wenn jemand ihre Werke rechtmäßig − also dafür zahlend − kopiert, sendet oder ins Internet stellt. Um an das Geld dafür zu kommen, müssen Autoren ihre Produkte anmelden.
Predictors of alternative antidepressant agent initiation among U. S. veterans diagnosed with depression
Authors: Kim Hyungjin Myra , Zivin Kara , Ganoczy Dara , Pfeiffer Paul , Hoggatt Katherine , McCarthy John F. , Downing Karen , Valenstein Marcia 
Published: July 2010

AbstractOBJECTIVESNaturalistic studies comparing differences in risks across antidepressant agents must take into account factors which influence selection of specific agents and may be associated with outcomes. We examined predictors of antidepressant choice among VA patients treated for depression.METHODSRetrospective cohort study of VA patients with depression diagnoses and a new start of one of the seven most commonly prescribed antidepressant agents between 1 April 1999 and 30 September 2004 (n = 502 179). We examined the relationship between patient and facility characteristics and new starts of bupropion, citalopram, fluoxetine, mirtazapine, paroxetine, sertraline, and venlafaxine. We also examined factors associated with new starts only among patients starting selective serotonin reuptake inhibitors (SSRIs).RESULTSThirty‐three percent of patients starting mirtazapine had at least three outpatient mental health visits in the prior year, compared to ≤24% of patients prescribed other antidepressants. Patients starting mirtazapine were also most likely to have received at least two other psychotropic medications in the prior year. Of the four SSRIs, 40% of the patients receiving sertraline and only 31% of those receiving fluoxetine were 65 years or older. A comorbid anxiety disorder (other than post‐traumatic stress disorder) was diagnosed in 21% of paroxetine patients compared with ≤15% of other SSRI patients.CONCLUSIONChoice of antidepressant medication for depressed VA patients was associated with important differences in demographic and clinical variables, including psychiatric illness severity, older age, and likelihood of a comorbid anxiety disorder. These findings emphasize the importance of controlling for selection bias when using observational data to compare risks from or effect of mental health treatments. Copyright © 2010 John Wiley & Sons, Ltd.
Simplified preparation of low polydispersity, low molecular weight poly(D,L‐lactic acid) by liquid/liquid phase separation for drug delivery systems with discussion of molecular weight characterization
Authors: Gu Jian Hua , Huang Yu Jin , Beekman Alice , Goldenberg Merrill 
Published: July 2010

AbstractPoly(D,L‐lactic acid) (PLA) has been widely used in pharmaceutics and medicine. Low molecular weight (LMW) PLA is especially useful for rapidly degrading biomaterials such as those used for short‐duration drug delivery systems. There is scant information available in the literature regarding the purification and analysis of LMW PLA. In this paper we report (1) a convenient and effective polymer purification/fractionation technique to produce LMW PLA with narrow molecular weight distribution (MWD) and (2) analyses that were used to characterize the molecular weight and MWD of these polymers. A novel, convenient and effective temperature‐induced solution‐phase separation method was developed to produce narrow MWD, LMW (600–2000 g mol−1) PLA. Molecular weights determined using gel permeation chromatography (GPC) with universal calibration, unlike those determined with the commonly used conventional calibration, showed good agreement with those obtained using several independent direct techniques. The phase separation induced by temperature reduction of a polymer in a single solvent system provided a simple and effective technique to produce narrow MWD, LMW PLA polymers. Additional advantages of this technique are: (1) only one solvent is required; (2) the risk of local complete solid polymer precipitation is eliminated; (3) it is reversible and not dependent on the rate of cooling; and (4) use of chlorinated solvents is avoided. This technology may open up a new opportunity for manufacturing LMW polymers with narrow MWD. We also found that GPC with universal calibration is a more accurate method than GPC with the commonly used conventional calibration for characterizing these polymers, and is straightforward to use especially now that on‐line viscosity detectors are widely available. Copyright © 2010 Society of Chemical Industry