bluuebunny/crossref_metadata_2025 huggingface dataset:
George W. Bush’s “Three Shakespeares”: Macbeth, Macbush, and the Theater of War
Authors: Barnes Todd Landon
Published: August 2008

This essay examines Macbeth and presidential politics during the Cold War and during the Global War on Terror. The essay focuses on two sets of productions: 1) a series of "tactical," counterinsurgent protest performances of Macbush , including amateur rewritings of Macbeth which appeared on stages, online, in magazines and in the street in direct contact with Bush's presence at the G8 summit, and 2) the NEA's seemingly co-opted, official, "strategic" performances of Macbeth at military bases, part of a military tour sponsored generously by Boeing and the US Department of Defense. Using the mode of "immanent critique" developed by Deleuze and de Certeau, Barnes argues that dialectical understandings of culture and power rely upon a particular way of understanding the priority of space, one rooted firmly in Cold War discourses of cultural fronts and quantitative movements through homogenous space. Reading the NEA's founding documents alongside the Iraq Study Group report, Barnes argue that the Bush administration's confidence in static space-like Macbeth in Dunsinane when the "wood began to move"-encountered "terror" when it met with temporal changes in the space of the battlefield. Despite national efforts to determine the meaning of performance spaces (in ways that parallel military efforts to control and determine unstable cartographies), the durational work of performance does more than it means, producing affective bonds and temporal behaviors that exceed and reconfigure the ostensibly determined semantic spaces of the page (much as temporal improvisation and insurgency work to disrupt static notions of the battlefield).
Advances in neuroimaging in patients with epilepsy
Authors: Widjaja Elysa , Raybaud Charles
Published: August 2008

Intractable seizures can have a devastating effect on the development of a child. In children with intractable epilepsy that is refractory to medication, surgical treatment may be needed. Magnetic resonance imaging is an essential neuroimaging tool to assist in the identification of an epileptogenic substrate. The interpretation of MR images should be done in the context of clinical knowledge of the seizure symptomatology and electroencephalographic findings. Quantitative processing of structural MR data and advanced MR imaging such as diffusion tensor imaging and MR spectroscopy have the potential to identify subtle lesions that may otherwise have been missed. In addition to lesion localization, identification of eloquent cortex and white matter tracts are also an essential component of epilepsy surgery workup. Functional MR imaging maps the sensorimotor cortex and also lateralizes language. Diffusion tensor imaging tractography can be used to map the corticospinal tracts and the optic radiations. In addition to MR imaging, magnetoencephalography and nuclear medicine studies such as PET and SPECT scanning may be used to lateralize seizure focus when clinical, electrophysiological, and structural MR imaging findings are discordant.
Surgical management of hypothalamic hamartomas in patients with gelastic epilepsy
Authors: Addas Bassam , Sherman Elisabeth M. S. , Hader Walter J.
Published: August 2008

Gelastic epilepsy (GE) associated with hypothalamic hamartomas (HHs) is now a well-characterized clinical syndrome consisting of gelastic seizures starting in infancy, medically refractory seizures with or without the development of multiple seizure types, and behavioral and cognitive decline. It has been postulated that the development of the HH-GE syndrome is a result of a progressive epileptic encephalopathy or secondary epileptogenesis, which is potentially reversible with treatment of the HH. A variety of surgical options for the treatment of HHs exist, including open and endoscopic procedures, radiosurgery, interstitial radiotherapy, and stereotactic radiofrequency thermocoagulation. Surgical treatment can result in seizure freedom in up to 50% of patients and can be accompanied by significant improvements in behavior, cognition, and quality of life. Partial treatment of HHs may be sufficient to reduce seizure frequency and improve behavior and quality of life with less risk. A component of reversible cognitive dysfunction may be present in some patients with an HH-GE syndrome.
Raising International Competitiveness of Tourism in Ethiopia
Authors: Atomsa Tariku , Weiermair Klaus
Published: August 2008

As of late Ethiopia, one of the world's poorest countries, is attempting to stimulate the growth and development of tourism. This article presents the competitiveness of tourism in Ethiopia using some of the materials from Tariku's Dissertation and available tourism flow data from WTO
from key tourism-sending countries to four competing East African tourism-receiving countries, including Ethiopia. Using the Shift-Share method of decomposition of tourism flow the article analyzes competitive advantages and specialization of tourism-receiving regions vis-à-vis sending
regions. The article concludes with recommendations regarding the future requirements for tourism growth in Ethiopia.
Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers
Authors: Calvo Mauricio E. , Colodrero Silvia , Rojas T. Cristina , Anta Juan Antonio , Ocaña Manuel , Míguez Hernán
Published: September 2008

A synthetic route to building photoconducting films of TiO2 nanoparticles that display bright structural color is presented. The color arises as a result of the periodic modulation of the refractive index, which is achieved by controlling the degree of porosity of each alternate layer through the particle size distribution of the precursor suspensions. The suspensions are cast in the shape of a film by spin‐coating, which allows tailoring of the lattice parameter of the periodic multilayer, thus tuning the Bragg peak spectral position (i.e., its color) over the entire visible region. Photoelectrochemical measurements show that the Bragg mirrors are conductive and distort the photocurrent response as a result of the interplay between photon and electron transport.
Soft Nanopatterning on Light‐Emitting Inorganic–Organic Composites
Authors: Persano Luana , Molle Sandra , Girardo Salvatore , Neves Antonio A. R. , Camposeo Andrea , Stabile Ripalta , Cingolani Roberto , Pisignano Dario
Published: September 2008

In this work we demonstrate the nanopatterning of nanocomposites made by luminescent zinc oxide nanoparticles and light‐emitting conjugated polymers by means of soft molding lithography. Vertical nanofluidics is exploited to overcome the polymer transport difficulties intrinsic in materials incorporating nanocrystals, and the rheology, fluorescence, absolute quantum yield, and emission directionality of the nanostructured composites are investigated. We study the effect of patterned gratings on the directionality of light emitted from the nanocomposites, finding evidence of the enhancement of forward emitted light, due to the printed wavelength‐scale periodicity. These results open new possibilities for the realization of nanopatterned devices based on hybrid organic‐inorganic systems.
Theoretical and Experimental Studies of Bending of Inorganic Electronic Materials on Plastic Substrates
Authors: Park Sang‐Il , Ahn Jong‐Hyun , Feng Xue , Wang Shuodao , Huang Yonggang , Rogers John A.
Published: September 2008

This paper describes materials and mechanics aspects of bending in systems consisting of ribbons and bars of single crystalline silicon supported by sheets of plastic. The combined experimental and theoretical results provide an understanding for the essential behaviors and for mechanisms associated with layouts that achieve maximum bendability. Examples of highly bendable silicon devices on plastic illustrate some of these concepts. Although the studies presented here focus on ribbons and bars of silicon, the same basic considerations apply to other implementations of inorganic materials on plastic substrates, ranging from amorphous or polycrystalline thin films, to collections of nanowires and nanoparticles. The contents are, as a result, relevant to the growing community of researchers interested in the use of inorganic materials in flexible electronics.
Charged Rod‐Like Nanoparticles Assisting Single‐Walled Carbon Nanotube Dispersion in Water
Authors: Doe Changwoo , Choi Sung‐Min , Kline Steven R. , Jang Hyung‐Sik , Kim Tae‐Hwan
Published: September 2008

A new dispersant for stabilization of single wall carbon nanotubes (SWNTs) in water that simultaneously utilizes three different dispersion or stabilization mechanisms: surfactant adsorption, polymeric wrapping, and Coulomb repulsive interaction, has been demonstrated. The new dispersant, a charged rod‐like nanoparticle (cROD), is a cylindrical micelle wrapped by negatively charged polymers which is fabricated by the aqueous free radical polymerization of a polymerizable cationic surfactant, cetyltrimethylammonium 4‐vinylbenzoate (CTVB), in the presence of sodium 4‐styrenesulfonate (NaSS). The surface charge density of the cRODs is controlled by varying the concentration of NaSS. Dispersions of SWNTs are obtained by sonicating a mixture of SWNTs and cROD in water, followed by ultra‐centrifugation and decanting. While the cRODs with neutral or low surface change densities (0 and 5 mol % NaSS) result in very low dispersion power and poor stability, the cRODs with high surface charge densities (15, 25, and 40 mol % NaSS) produce excellent dispersions with SWNT concentration as high as 437 mg L−1 and long term stability. The sharp van Hove transition peaks of the cROD assisted SWNT dispersions indicate the presence of individually isolated SWNTs. Atomic force microscopy and small angle neutron scattering analysis show that the dominant encapsulation structure of the cROD assisted SWNTs is surfactant assisted polymeric wrapping. SWNTs dispersed by the cRODs can be fully dried and easily re‐dispersed in water, providing enhanced processibility of SWNTs.
Safe bounds check annotations
Authors: von Ronne Jeffery , Gampe Andreas , Niedzielski David , Psarris Kleanthis
Published: September 2008

The semantics of the Java programming language require that the out‐of‐bounds array accesses be caught at runtime. In general, this requires dynamic checks at the time the array element is accessed. Some of these checks can be eliminated statically during just‐in‐time (JIT) compilation, but the most precise analyses are too expensive to run in JIT compilers. This paper presents a framework in which thorough static range analyses can be used safely during the less‐performance‐critical compilation of Java source into machine‐independent mobile code. In this framework, the static analysis results are used to derive proofs that certain linear inequality constraints hold. These linear constraints and their proofs are then added to the mobile code as annotations. The annotation framework is designed so that proofs can be verified efficiently. This allows the JIT compiler to safely eliminate array bounds checks during compilation without an expensive runtime analysis. Experiments with a prototype system that can generate and verify these annotations demonstrate that this framework is more precise than prior work and that verification is efficient. Copyright © 2008 John Wiley & Sons, Ltd.
Topology agnostic hot‐spot avoidance with InfiniBand
Authors: Vishnu Abhinav , Koop Matthew , Moody Adam , Mamidala Amith , Narravula Sundeep , Panda Dhabaleswar K.
Published: September 2008

InfiniBand has become a very popular interconnect due to its advanced features and open standard. Large‐scale InfiniBand clusters are becoming very popular, as reflected by the TOP 500 supercomputer rankings. However, even with popular topologies such as constant bi‐section bandwidth Fat Tree, hot‐spots may occur with InfiniBand due to inappropriate configuration of network paths, presence of other jobs in the network and un‐availability of adaptive routing. In this paper, we present a hot‐spot avoidance layer (HSAL) for InfiniBand, which provides hot‐spot avoidance using path bandwidth estimation and multi‐pathing using LMC mechanism, without taking the network topology into account. We propose an adaptive striping policy with batch‐based striping and sorting approach, for efficient utilization of disjoint network paths. Integration of HSAL with MPI, thede factoprogramming model of clusters, shows promising results with collective communication primitives and MPI applications. Copyright © 2008 John Wiley & Sons, Ltd.
A framework for the massive knowledge Web
Authors: Sun Xiaoping , Zhuge Hai , Li Qing
Published: September 2008

This paper proposes a framework consisting of a semantic object model and a scalable platform for supporting effective publishing and sharing of massive knowledge on Web 2.0. The platform integrates the P2P computing techniques to provide users with flexible tools to manage personalized resources and services. The semantic object model provides an object‐oriented semantic description language and a semantic object query language for publishing and querying resources. Semantic indexing mechanisms are used to support efficient semantic query processing. The semantic object model enables users to define and manipulate semantics with more explicit object semantics and can be well adapted to the P2P platform to support scalable and extensible management on semantics‐rich Web resources. Copyright © 2008 John Wiley & Sons, Ltd.
A new semantic model with applications in a multimedia database system
Authors: Li Qing , Li Na , Wang Liping , Sun Xiaoping
Published: September 2008

When people realized that relational databases fall short in supporting advanced applications including multimedia data management due to the limited modeling power of the relational data model, researchers went ahead with devising semantic, object‐oriented data models in the 1980s (until early 1990s). While the later commercial development of database systems has led to the so‐called object‐relational databases since late 1990s, such a marriage of the two does not actually solve the problems encountered by multimedia data management. In this paper, we present a new semantic multimedia database model based on an extension to the traditional ANSI/SPARC three‐level architecture, attempting to cater for the unique requirements of multimedia data management. Various facilities of this semantic multimedia database model are described and discussed. A number of applications have been developed based on this new model, and in this paper we shall describe some of these including recipe modeling and graph mining for retrieval. Copyright © 2008 John Wiley & Sons, Ltd.
Molecular targeting of the PKC‐β inhibitor enzastaurin (LY317615) in multiple myeloma involves a coordinated downregulation of MYC and IRF4 expression
Authors: Verdelli Donata , Nobili Lucia , Todoerti Katia , Intini Daniela , Cosenza Maria , Civallero Monica , Bertacchini Jessika , Deliliers Giorgio Lambertenghi , Sacchi Stefano , Lombardi Luigia , Neri Antonino
Published: September 2008

The protein kinase C (PKC) pathway has been shown to play a role in the regulation of cell proliferation in several haematological malignancies, including multiple myeloma (MM). Recent data have shown that a PKC inhibitor, enzastaurin, has antiproliferative and proapoptotic activity in a large panel of human myeloma cell lines (HMCLs). In order to further characterise the effect of enzastaurin in MM, we performed gene expression profiling of enzastaurin‐treated KMS‐26 cell line. We identified 62 upregulated and 32 downregulated genes that are mainly involved in cellular adhesion (CXCL12, CXCR4), apoptosis (CTSB, TRAF5, BCL2L1), cell proliferation (IGF1, GADD45A, BCMA (B‐cell maturation antigen), CDC20), transcription regulation (MYC, MX11, IRF4), immune and defence responses. Subsequent validation by Western blotting of selected genes in four enzastaurin‐treated HMCLs was consistent with our microarray analysis. Our data indicate that enzastaurin may affect important processes involved in the proliferation and survival of malignant plasma cells as well as in their interactions with the bone marrow microenvironment and provide a preclinical rationale for the potential role of this drug in the treatment of MM. Copyright © 2008 John Wiley & Sons, Ltd.
Numerical analysis on thermal characteristics for chip scale package by integrating 2D/3D models
Authors: Yang Ping , Li Wei
Published: September 2008

The objective of this paper is to investigate stress and strain of a special scale package‐substrate on chip for reliability evaluation or manufacture strategy in deep‐seated situation. A two‐dimensional model with one‐half of cross‐section (2D model) and a three‐dimensional model with one‐fourth of whole package (3D model) were built, respectively, to simulate the thermal stress and strain of CSP‐SOC under the condition of the standard industry thermal cycling temperature −40 to125°C. The different locations can be processed by using the two models, respectively, based on different modeling simplified modes. By using 2D model, the numerical simulation shows that the maximum deformation of the prototype occurs in printed circuit board (PCB), the maximum stress and strain occurs in the outer solder balls. In the meantime, by the results of 3D model, the simulation shows that the maximum elastic strain occurs in the interface between the solder balls and PCB, the minimum strain occurs in the underfill tape, the maximum packaging stress occurs in the edge area of the chip. The result from 3D model maybe more impersonal to reflect the stress and strain characteristics because the third direction is considered in modeling. The analysis by integrating the 2D model and 3D model can get a more comprehensive profile for the thermal investigation of chip scale package (CSP) than by using any single model. The investigation built a basis for improving reliability in engineering design of CSP product. Copyright © 2008 John Wiley & Sons, Ltd.
Characterization of ethnographic copper corrosion
Authors: Souissi N. , Triki E.
Published: September 2008

Analytical and electrochemical techniques were used to characterize the alteration of Tunisian ethnographic copper artefacts. Analytical results confirmed the existence of the bulk material in both objects constituting the ethnographic set. The bulk material was identified as a copper alloy with about 11% carbon content. The material was plated with a tin‐based coating prior to use. Alteration characterization showed that corrosion is more severe at the bottom of the ‘Kiskes’ where the object was submitted to the hot steam. EN results reflected the interaction of the aggressive anion (Cl−) with the passive layer and the condensation of cation vacancies. Three anodic peaks were evidenced in the polarization curve corresponding to the oxidation of Sn(II), Cu(0) and Cu(I). A hysteresis loop was detected in the reversed scan confirming surface pitting.
Erratum: A slot‐loaded slot antenna fed by inset CPW for dual frequency operation
Authors: Rhee Seungyeop
Published: August 2008

Originally published Microwave Opt Technol Lett 50 (2008), 1984–1986.
Selective bandpass filter with concentrated impulse response
Authors: Potrebić Milka M. , Tošić Dejan V.
Published: August 2008

This article presents a novel narrow bandpass filter implementation, which is based on a lowpass prototype with suppressed time‐domain sidelobes and periodically related zeros of the impulse response. The proposed design methodology is exemplified by a fourth‐order microstrip bandpass filter, which is fabricated and measured. The simulated and measured results are in agreement with both frequency and time domain. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2772–2777, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23785
A new formulation and solution method of electromagnetic scattering from arbitrary shaped dielectric objects
Authors: Tezel Necmi Serkan
Published: August 2008

In this study, a new and computational effective method related to electromagnetic scattering from arbitrary shaped dielectric objects is proposed. This method is based on Taylor series expansion of fields with unknown coefficients on the circles that are inside and outside of object. By using the boundary condition, series equations are obtained. These series of equations can be solved by using orthogonality properties of Fourier expansion functions. This transformation makes the problem with simple formulation which can be solved computational effectively. Results and computational times obtained by transform method and those obtained by Method of Moments (MoM) technique are compared. Good agreements are observed in results. It is also observed that transform method needs less computational time than MoM method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2768–2772, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23786
All‐optical clock enhancement for transmitted NRZ data streams based on CFBG
Authors: Chen Ming , Zhang Feng , Jian Shuisheng , Citrin D. S.
Published: August 2008

A new but simply implemented all‐optical clock enhancement scheme for nonreturn‐to‐zero (NRZ) data streams utilizing a semiconductor optical amplifier (SOA) and a chirped fiber Bragg grating (CFBG) is presented. The clock‐to‐carrier suppression ratio is highly improved by more than 23 dB by the CFBG compared with the value obtained only including the SOA. In addition, the clock is recovered based on stimulated Brillouin scattering (SBS). The clock recovery for the NRZ signal following various lengths of single‐mode fiber (SMF) is numerical simulated and also demonstrated experimentally. The recovered clock degrades as the length of fiber increases. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2764–2768, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23787
Ultra‐wideband bandpass filter using simplified left‐handed transmission line structure
Authors: Han Wenjia , Feng Yijun
Published: August 2008

A novel ultra‐wideband bandpass filter has been proposed based on a simplified left‐handed transmission line (LH‐TL) structure. The main design procedure is to define and realize the LH‐TL unit cell according to the desired pass band. The filter has been realized in theory, verified by both full‐wave electromagnetic simulation and microwave circuit simulation, and confirmed by the measurement with a return loss higher than 12 dB, and the group delay about 0.25 ns over the central band with variation of 0.2 ns. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2758–2762, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23789
Oversize rectangular microstrip patch with higher‐order mode suppression using multifeed network
Authors: Chiu L. , Xue Q.
Published: August 2008

An oversize microstrip patch antenna using multifeed has been proposed. By employing 1‐to‐8 in phase power divider, the antenna has been excited using edge feeds and resonates at fundamental mode. The proposed patch antenna is designed for high antenna gain of 10.9 dBi at 5.8 GHz. The occupancy area of proposed antenna is 34% smaller than that of conventional 8‐element microstrip patch antenna array. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2749–2751, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23792
Microstrip ring resonator filter enabling enhanced sideband suppression
Authors: Kyoung Un‐Hwan , Kim Gun‐Duk , Lee Sang‐Shin , Eo Yun‐Seong
Published: August 2008

A microstrip filter based on a single‐ring bandpass section integrated with a band‐trimming section incorporating two cascaded rings was demonstrated featuring enhanced sideband suppression. The stop‐band for the input bandpass section could be selectively eliminated via the proposed band‐tailoring section without causing any excessive loss, thereby improving the overall transmission of the device with regard to higher suppression, sharper roll‐off, and narrower bandwidth. For the completed device with the center frequency at 4 GHz, the suppression ratio was increased by −8 dB, the 3‐dB bandwidth was reduced from 98 MHz to 48 MHz with negligible excessive loss, and the filter quality factor was elevated by about 105%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2866–2869, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23795
Effect of AlN film thickness on photo/dark currents of MSM UV photodetector
Authors: Yang Ru‐Yuan , Hsiung Chin‐Min , Chen Hsuan‐Hsu , Wu Hung‐Wei , Shih Ming‐Chang
Published: August 2008

In this article, we have successfully fabricated the metal‐semi‐conductor‐metal (MSM) UV photodetector using the aluminum nitride‐based (AlN) film as an active layer grown on p‐type Si (100) by a dc sputtering deposition. Effect of AlN thickness of 500, 1500, and 2500 nm on the surface morphology of the AlN film and photo/dark currents of the MSM photodetector is investigated. With increase of the AlN thickness, XRD result shows the crystallization of AlN film increases. The device can be extensively used in solar‐blind UV applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2863–2866, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23796
Dual‐band monopole antenna with L‐shaped strips for 2.4/5 GHz WLAN applications
Authors: Gu Jian‐Hui , Zhong Shun‐Shi , Xue Ling‐Long , Sun Zhu
Published: August 2008

A novel design of dual‐band monopole antenna fed by a coplanar waveguide (CPW) for wireless local area network (WLAN) applications is presented. By using dual L‐shaped strips, the impedance bandwidth of 5 GHz band is significantly increased. The measured impedance bandwidth for −10 dB return loss is from 2.28 to 2.70 GHz (16.9%) and from 4.52 to 6.28 GHz (32.9%), covering the 2.4/5 GHz WLAN operating bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2830–2833, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23797
Miniaturized compound spiral slot antenna
Authors: Yu‐Xiao Zhu , Shun‐Shi Zhong , Sai‐Qing Xu
Published: August 2008

This article introduces a miniaturized compound spiral slot antenna with a wideband balun and a back cavity. The simulated and experimental results show that the proposed antenna presents good circular polarization and wideband properties. Its measured return loss is less than −10 dB in the frequency range 0.75 to 8 GHz (10.7:1) and the axial ratio is less than 3.5 dB in the range 0.95 to 8 GHz. Comparing with the conventional spiral antenna, the proposed antenna diameter is only one fourth of that of the former, therefore the antenna size is significantly reduced. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2799–2801, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23801
The forbidden bandgap characteristic of EBG structures
Authors: Steven Yang Shing‐Lung , Kishk Ahmed A. , Lee Kai‐Fong
Published: August 2008

The bandgap characteristics of several electromagnetic bandgap (EBG) structures are compared, and parametric studies of a wideband uniplanar compact photonic bandgap (UC‐PBG) structure are carried out. It has been presented that the bandgap bandwidth of the mushroom type EBG structure increases when a lower dielectric constant substrate is used or when a larger substrate thickness is used. However, for the UC‐PBG structures, which do not have shorting vias, the bandgap characteristic does not follow the trend as it is in the EBG structure with shorting via. Moreover, it is demonstrated that the bandgap frequency varies with the dielectric constant of the substrate, but the bandgap bandwidth does not have particular trend with the dielectric constant of the substrate. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2965–2967, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23804
Biocompatibility study of hydroxyapatite‐chitosan composite for medical applications at microwave frequencies
Authors: Augustine Robin , Kalappura Ullas G. , Mathew K. T.
Published: August 2008

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) bioceramic and chitosan (poly [(β‐1‐4) D‐glucosamine]) biopolymer show good biocompatibility in vivo. They have biological origin and show excellent interactions with microwave. Microwave study of HAp made using different drying techniques and their composites with chitosan in the ISM band is presented. Pastes are made using HAp and chitosan with different ratios of mixing. The dielectric properties of this composites match with that of human fat, collagen tissues. Some of the compositions exhibit dielectric property close to that of natural bone. This makes them more biocompatible and better substitutes for natural bone. Thus composite bioceramics can be considered as phantom model constituents for imaging purposes. Their dielectric properties prove that they are biocompatible. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2931–2934, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23806
Ultrathin planar inverted‐F antenna for multistandard handsets
Authors: Bhatti Rashid A. , Im Yun‐Taek , Choi Jung‐Hwan , Manh Tuan D. , Park Seong‐Ook
Published: August 2008

A compact multiband internal antenna has been proposed for multistandard personal communication handsets. The antenna simultaneously covers various frequency bands such as GSM, DCS, PCS, UMTS, WiBro, Bluetooth, S‐DMB, and WLAN. Total volume of the antenna is 0.78 cm3 (2.6 cm × 1.5 cm × 0.2 cm) that makes it attractive for multiband slim handsets. Measured performances of the prototype antenna are acceptable at all the targeted frequency bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2894–2897, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23808
Retracted: 488 nm ultraviolet light generated by VECSEL and V‐cavity second‐harmonic generation using lithium triborate
Authors: Du Shisen , Kaneda Yushi , Yarborough Mike
Published: August 2008

The following article from Microwave and Optical Technology Letters, "488 Nm Ultraviolet Light Generated By VECSEL And V‐Cavity Second‐Harmonic Generation Using Lithium Triborate," published online on August 30, 2008 and in print in November 2008 in Wiley InterScience (www.interscience.wiley.com), has been retracted by the journal Editor in Chief, Dr. Kai Chang and Wiley‐Blackwell at the request of the second and third named authors, Y. Kaneda and M. Yarborough, who state that the article was written without their input or consent. They refer readers to the original articles which they state correctly represent this research:

[1] Y. Kaneda, J. M. Yarborough, L. Li, N. Peyghambarian, L. Fan, C. Hessenius, M. Fallahi, J. Hader, J. V. Moloney, Y. Honda, M. Nishioka, K. Miyazono, H. Shimatani, M. Yoshimura, Y. Mori, Y. Kitaoka, and T. Sasaki, "Efficient, 0.2‐W, all‐solid‐state CW 244‐nm laser," presented at Conference on Lasers and Electro‐Optics 2008, postdeadline paper CPDA2, San Jose, CA, 2008.

[2] Y. Kaneda, J. M. Yarborough, L. Li, N. Peyghambarian, L. Fan, C. Hessenius, M. Fallahi, J. Hader, J. V. Moloney, Y. Honda, M. Nishioka, Y. Shimizu, K. Miyazono, H. Shimatani, M. Yoshimura, Y. Mori, Y. Kitaoka, and T. Sasaki, "Continuous‐wave all‐solid‐state 244 nm deep‐ultraviolet laser source by fourth‐harmonic generation of an optically pumped semiconductor laser using CsLiB6O10 in an external resonator," Opt. Lett., vol. 33, pp. 1705‐1707, 2008.
A spiral‐shaped monopole antenna for quad‐band operation of mobile handsets
Authors: Yoon Cheol , Park Wook‐Ki , Kang Suk‐Youb , Park Hyo‐Dal
Published: August 2008

ABSTRACT: This article presents the design and fabrication of a quad‐band spiral‐shaped monopole antenna for application in a GPS (1575 ± 10 MHz)/DCS (1710–1880 MHz)/PCS (1850–1990 MHz) with a UMTS (1920–2170 MHz) band. To obtain sufficient bandwidth in VSWR < 2, an air layer is inserted between the ground plane and the substrate. A spiral‐shaped monopole antenna that has a quad‐band characteristic is used. Important design parameters are the spiral radiator gap's width and length, the air‐gap's height, and the feed point's position. From these optimized parameters, a spiral‐shaped monopole antenna is fabricated and measured. The measured results of the fabricated antenna are obtained from all bands at 940 MHz bandwidths in VSWR < 2 referenced to the center frequency, and the individual gain at 2.2 dBi, 2.5 dBi, 2.6 dBi, and 2.6 dBi. The experimental 3 dB beam width is shown to be broad across the pass band in the E‐plane, and 74°, 68°, 64°, and 60°, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2860–2863, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23810
The fully‐integrated CMOS RF power amplifier using the semilumped transformer
Authors: Jin Boshi , Han Kichon , Choi Jinsung , Kang Daehyun , Kim Bumman
Published: August 2008

A semilumped output transformer for fully‐integrated RF CMOS power amplifier is proposed in this paper. To demonstrate this transformer, a 2.5‐GHz CMOS power amplifier is implemented with a 0.18‐μm RF CMOS process used for WiMAX application. The power amplifier can achieve 39% PAE (power added efficiency) at P1dB (1 dB compression point) and output power of 30 dBm. The linearity can satisfy the spectrum mask of the WiMAX signal requirement basically. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2857–2860, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23811
Metamaterial multiresonances in waveguide and metasurfaces
Authors: Aznabet M. , Beruete M. , Navarro‐Cía M. , El Mrabet O. , Falcone F. , Aknin N. , Essaaidi M. , Sorolla M.
Published: August 2008

In spite of the fact of its potential relevance for future advanced metamaterial design, split rings resonators high‐order resonances data are very limited in the literature. This article presents these co‐ and cross‐polarization high‐order resonances by means of numerical electromagnetic simulation and measurements in both monomode waveguides and free space propagation. A good agreement between simulation and experiments has been observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2825–2827, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23812
Minkowski fractal boundary single feed circularly polarized microstrip antenna
Authors: Nageswara Rao Pasumarthy , Sarma N.V.S.N.
Published: August 2008

A single feed circularly polarized Minkowski fractal boundary microstrip antenna is presented. By changing the fractal dimension of the boundary in both the directions of the antenna it is established that a very good circular polarization with 3 db axial ratio bandwidth of about 1.4% is realizable. Furthermore it is shown that the surface area occupied by the antenna is reduced compared with the Euclidean‐shaped patch antennas without much degradation in gain of the antenna. Experimental results are compared with simulated results and a very good agreement is obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2820–2824, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23813
Triple‐band CPW‐fed monopole antenna with branch strips for wireless applications
Authors: Liu Wen‐Chung , Jaw Jieh‐La , Chen Bohr‐Chun
Published: August 2008

By properly loading branch strips to a monopole antenna fed by a coplanar waveguide (CPW) feedline, an antenna with good impedance matching in a wide triple‐band covering PCS‐1900/UMTS‐2100 and the 5.2/5.8 GHz WLAN systems is designed. Prototype of the proposed antenna has been constructed and experimentally studied. The measured results not only explore wide −10 dB impedance bandwidths of 21, 18, and 15% at the operating bands of 2.16, 5.27, and 7.52 GHz, respectively, but also show good agreement with the numerical predictions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2794–2797, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23815
Study of a band‐notched double printed dipole antenna
Authors: Wang Fa‐Jia , Zhang Jin‐Sheng
Published: August 2008

In this article, a double‐printed dipole antenna with band‐notched function for UWB applications is proposed and investigated. The band‐notched characteristic is achieved by inserting two U‐shaped slots on the dipole. Experimental and numerical results show that the proposed antenna meets the requirement of 3.1–10.6 GHz UWB systems with VSWR < 2, while avoiding the interference with the 5 GHz WLAN band. Transmitting antenna transfer function, receiving antenna transfer function, and antenna system function are used to describe the antenna performance. The impulse responses in time domain were calculated using inverse Fourier transform. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2986–2989, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23816
Microstrip low‐pass filter using open loop resonators
Authors: Ranjan Jha Kumud , Nehra Neeraj
Published: August 2008

A compact open loop resonator microstrip low pass filter is modeled. To optimize the performances of the filter, electromagnetic simulation is used to tune the dimensions of proposed prototype. Cascading of open loop resonator provides a very sharp cut off and wide stop band with minimum insertion loss. The filter is simulated with an equivalent circuit model and it is found to be in good agreement with the structure model response. The structure provides a near ideal response. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2983–2986, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23817
Influence of metal‐semiconductor contact on the transmission characteristics of image dielectric waveguide
Authors: Dudorov S. N. , Lioubtchenko D. V. , Räisänen A. V.
Published: August 2008

Influence of a “Schottky‐like” barrier on a Silicon rod waveguide to its propagation characteristics were studied in W‐band. A considerable positive phase shift was observed, with a maximum at about 99 GHz (about 10 radians at 30‐mm long waveguide). Maximal insertion loss was also observed at the same frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2925–2928, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23820
Flat‐plate triangular monopole antenna for Wi‐Fi/WiMAX/DVB‐H applications
Authors: Pazin Lev , Kogan Igor , Leviatan Yehuda
Published: August 2008

A novel printed multiband flat‐plate monopole antenna is presented. The proposed antenna consists of a slotted triangular monopole embedded in a rectangular notch in the antenna ground plane part. Simulated and measured results of the input return loss for the proposed antenna are in good agreement. The antenna has been shown to operate satisfactorily in the 0.42–0.92, 1.8–2.7, 3.1–3.8, and 4.9–6 GHz frequency bands, and is therefore very suitable for use in applications including Wi‐Fi, WiMAX, and DVB‐H. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2922–2925, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23821
Synthesis formulas for microcoplanar striplines
Authors: Guney Kerim , Yildiz Celal , Kaya Sabri , Turkmen Mustafa
Published: August 2008

This article presents new and accurate synthesis formulas for the microcoplanar stripline (MCS). The synthesis formulas are obtained by means of a differential evolution algorithm, and are useful to microwave engineers for accurately calculating the physical dimensions of MCS. The average percentage error is calculated to be 0.9% for 2254 MCS samples having different electrical parameters and physical dimensions, as compared with the results of the quasi‐static analysis. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2884–2888, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23823
Aperture field reconstruction by calculated cylindrical near field
Authors: Castelo Boso Alcino , de Haro Ariet Leandro , Luis Besada José
Published: August 2008

A method for determining the aperture field distribution of an array antenna from near‐field measurement over the surface of a right circular cylinder enclosing the antenna is applied here. The approach relies on the concept of information content of the field. The truncation problem is solved by picking up the information that is lost due to the finite size of scanning area, in points of the space reachable by the measurement system. In this article, we rebuild the field at the aperture from near‐field cylindrical calculated on the surface of measure, with dependence on the variable phi, and without dependence on the variable phi. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2849–2851, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23825
A novel broadband CPW‐fed asymmetrical slot antenna
Authors: Zhang Li , Jiao Yong‐Chang , Song Kun , Zhang Fu‐Shun
Published: August 2008

In this article, a novel CPW‐fed broadband asymmetrical slot antenna is proposed. The prototype consists of an asymmetrical slot and a tuning stub. From experimental results, the measured impedance bandwidth of this antenna, defined by −10 dB return loss, can reach an operating bandwidth of 6.63 GHz (2.27–8.9 GHz), or about 118.7% with the center frequency operating at 5.585 GHz. Also, good radiation patterns and gains covering the operating band have been observed. Details of the antenna design and experimental results are discussed in this article. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2817–2820, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23826
A Ka‐band CMOS power amplifier using new substrate‐shielded coplanar waveguide
Authors: Lee Jong‐Wook , Heo Sang‐Moo
Published: August 2008

A Ka‐band three‐stage power amplifier was developed in 0.18 μm CMOS technology using a new substrate‐shielded coplanar waveguide (CPW). The new CPW structure reduces the loss from the conductive silicon substrate allowing high gain for the amplifier. Broadband modeling of substrate‐shielded CPW in conjunction with the RF transistor model up to 40 GHz resulted in accurate gain matching of the amplifier. The power amplifier achieved a 12 dB small‐signal gain at 26.5 GHz, which is the highest for Ka‐band CMOS power amplifiers using common‐source transistors. The measured output power was 12.5 dBm with a power‐added‐efficiency of 8% at 26.5 GHz. These results show that scaled‐down CMOS technology is a viable option for low‐cost microwave and millimeter‐wave circuits. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2815–2817, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23827
A configurable L/S‐band integrated elliptical lowpass filter utilizing MEMS technology
Authors: Zhang Shumin , Elkis Radmil , Jasti Srinivas , Su Wansheng , Zaghloul Mona
Published: August 2008

In this article, the design, analysis, and implementation of a dual band 1 GHz/3 GHz elliptical filter utilizing a micro‐electro‐mechanical systems (MEMS) switch is introduced. The band selection is achieved via MEMS‐switch configurable capacitor structures. The RF MEMS switch uses thermal actuation and is separately fabricated and characterized; the switch achieves an insertion loss of 0.7 dB and an isolation of 45 dB. The elliptical filter is implemented using active frequency‐dependent negative resistor (FDNR) structures. The filter achieves 29 dB of rejection at a 500 MHz offset from the 944 MHz corner, and 26.2 dB of rejection at a 1 GHz offset from the 3.06 GHz corner. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2791–2794, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23828
Ultra‐wide band microwave filter utilizing quarter‐wavelength short‐circuited stubs
Authors: Shahrazel Razalli Mohammad , Ismail Alyani , Adzir Mahdi Mohd , Nizar Hamidon Mohd
Published: August 2008

Five poles quarter‐wave short‐circuited stubs is designed and developed to support the ultra‐wide band (UWB) applications. The filter, with a total size of 41 mm × 12 mm operates within 2.7–9.83 GHz, produces a fractional bandwidth of greater than 100%. The filter is fabricated on RT/Duroid 5880 board with thickness of 0.508 mm. Measured results indicate that the filter, consisting of five short‐circuited stubs, and a stepped impedance transmission line can cover up to 114% bandwidth within UWB frequency range with insertion loss (S21) better than 1.27 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2981–2983, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23830
Optical fiber sensor for localizing heating positions in multiple points using multichannel gratings with phase sampling and wavelength division multiplexing techniques
Authors: Xia Li , Shum P.
Published: August 2008

An optical fiber sensor system with multichannel fiber Bragg gratings (FBGs) is proposed. The gratings are designed and fabricated by phase sampling technique within strongly chirped phase masks. The sensing application can be realized at multiple points through wavelength division multiplexing (WDM) technique. It means that the different point can be monitored by different gratings, which occupies different wavelength region, according to the central pitch and chirp coefficient of phase masks. The heating position with high resolution can be analyzed through three corresponding channel shifts in the multichannel profile. In our experiment, the two multichannel gratings with channel spacing of 0.8 and 1.6 nm, respectively, are fabricated and used for sensing in two points. At last, the 400 μm accuracy of localizing the heating position is achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2951–2954, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23832
Integration of internal 700 MHz and WLAN/WiMAX antennas for palm‐sized mobile devices
Authors: Chou Jui‐Hung , Su Saou‐Wen
Published: August 2008

Two promising, internal, shorted monopole antennas for 700 MHz and WLAN/WiMAX operation are combined in an arrangement with minimized mutual coupling for palm‐sized mobile applications. The two stamped, metal‐plate antennas with a 2‐mm gap therein between can be integrated into a compact configuration and are then mounted near one side of the system circuit board. With the suitable shorting locations and arrangement of the two antennas, good isolation (S21 < −20 dB) between the two ports can easily be obtained. Analysis of placing a CCD shielding cylinder between the two antennas and the two shorting strips joined to form a shorting wall are also conducted. Detailed designs of the two antennas are described, and the results thereof are discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2948–2951, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23833