bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the structural stability of thermoelastic model of porous media
Authors: Chiriţă Stan , Ciarletta Michele 
Published: June 2007

AbstractIn the present paper we study the structural stability of the mathematical model of the linear thermoelastic materials with voids. We prove that the solutions of problems depend continuously on the constitutive quantities, which may be subjected to error or perturbations in the mathematical modelling process. Thus, we assume to have changes in the various coupling coefficients of the model and then we establish estimates of continuous dependence of solutions. We have to outline that such estimates play a central role in obtaining approximations to these kinds of problems.To derive a priori estimates for a solution we first establish appropriate bounds for the solutions of certain auxiliary problems. These are achieved by means of so‐called Rellich‐like identities.We also investigate how the solution in the coupled model behaves as some coupling coefficients tend to zero. Copyright © 2007 John Wiley
& Sons, Ltd.
Cranberry and blueberry: Evidence for protective effects against cancer and vascular diseases
Authors: Neto Catherine C. 
Published: May 2007

AbstractGrowing evidence from tissue culture, animal, and clinical models suggests that the flavonoid‐rich fruits of the North American cranberry and blueberry (Vaccinium spp.) have the potential ability to limit the development and severity of certain cancers and vascular diseases including atherosclerosis, ischemic stroke, and neurodegenerative diseases of aging. The fruits contain a variety of phytochemicals that could contribute to these protective effects, including flavonoids such as anthocyanins, flavonols, and proanthocyanidins; substituted cinnamic acids and stilbenes; and triterpenoids such as ursolic acid and its esters. Cranberry and blueberry constituents are likely to act by mechanisms that counteract oxidative stress, decrease inflammation, and modulate macromolecular interactions and expression of genes associated with disease processes. The evidence suggests a potential role for dietary cranberry and blueberry in the prevention of cancer and vascular diseases, justifying further research to determine how the bioavailability and metabolism of berry phytonutrients influence their activity in vivo.
Currents reconstruction using a modal expansion of near field measurements for synthesis error detection
Authors: Sanchez Daniel , Baquero Mariano , Rodrigo Vicent Miquel , Bernardo Bernardo 
Published: May 2007

AbstractA new procedure for obtaining the equivalent currents on a plane surface from spherical near field measurements is proposed. It uses the modal expansion in spherical waves and the plane wave spectrum to achieve the objective. Some results using real measurements are shown. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2043–2047, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22575
Instrument panel mount GPS antenna
Authors: Yegin Korkut 
Published: May 2007

AbstractWhen the GPS antenna is mounted inside the instrument panel or dashboard of a vehicle, its passive antenna performance is adversely affected. Free space and vehicle level measurements are performed to understand the extent of degradation. Then, the antenna with a low‐noise amplifier is connected to a GPS receiver, and the number of satellites tracked in a 24‐h period is recorded for system performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1979–1981, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22579
Design of multi‐layered polygonal helix antennas for RFID applications
Authors: Choo Jaeyul , Choo Hosung , Park Ikmo , Oh Yisok 
Published: May 2007

AbstractIn this letter, we propose a novel printed helix antenna for an RFID reader in the UHF band. The printed microstrip line of the antenna is first wound outside a polygonal‐shaped layer and then wound on an inner layer to control the overall gain and the radiation pattern of the antenna. On each layer, the winding pitch angles can have either negative or positive values, which results in a circularly polarized (CP) broad bandwidth. The structural details of the antenna were optimized using the Pareto genetic algorithm (GA), which allowed for excellent performance with the use of RFID reader antennas. The optimized two‐layered polygonal helix was fabricated on a flexible cardboard substrate. Performances of the antenna were measured and compared with those of simulations. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1971–1974, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22595
Novel dual‐band WLAN antennas with integrated band‐select filter for 802.11 a/b/g WLAN radios in portable devices
Authors: Demir Veysel , Huang Chun‐Wen Paul , Elsherbeni Atef 
Published: May 2007

AbstractNovel dual‐band WLAN antenna system with integrated band‐select filter is designed. This integrated antenna design system provide VSWR <2:1 for both 2.4–2.5 GHz and 4.9–5.85 GHz with omni‐directional radio patterns. Based on these features, a novel architecture for a dual‐band WLAN radio Front‐End in portable devices can be achieved. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1868–1872, 2007; Published online in Wiley Inter‐Science (www.interscience.wiley.com). DOI 10.1002/mop.22601
Research on broadband characteristics of double folded‐slot antenna with back ground conductor
Authors: He Qing‐Qiang , Wang Bing‐Zhong , Yin Zhong‐Liang 
Published: May 2007

AbstractA novel wideband coplanar waveguide‐fed double folded‐slot antenna with back ground conductor is proposed and studied. The design considerations for achieving broadband operation of the proposed double folded‐slot antenna are described. Return loss and radiation pattern are measured. The obtained results show that the impedance bandwidth, determined by 10 dB return loss of the proposed double folded‐slot antenna can be greater than 30%, and can be used for the engineering. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1829–1833, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22603
A current reused CMOS quadrature injection‐locked frequency divider
Authors: Chuang Yun‐Hsueh , Jang Sheng‐Lyang , Lee Shao‐Hwa , Chiang Yeuh‐Hua 
Published: May 2007

AbstractA new current‐reused injection‐locked frequency divider is proposed to generate quadrature outputs and implemented using the standard UMC 0.18 μm CMOS 1P6M process. The proposed circuit is made of two LC‐tank voltage controlled oscillators (VCOs) stacked in series and the VCOs are coupled with the coupling transistors to generate quadrature signals. The direct injection‐locked technique is applied to the VCO to perform a divide by two functions, so that the quadrature circuit can provide low phase noise signal. At the 1.8 V supply voltage, the free running frequency of proposed circuit operates from 2.3 to 2.63 GHz and provides 1 GHz locking from 4.43 to 5.43 GHz. The power consumption is 7.4 mW with 4.1 mA current consumption. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1804–1806, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22604
High‐order accurate FDTD method based on the combination of staggered backward differentiation integrator with optimal central finite difference scheme
Authors: Xiao Fei , Tang Xiaohong 
Published: May 2007

AbstractIn this letter, a high order accurate FDTD method is proposed, in which a fourth‐order accurate staggered backward differentiation integrator is used for time marching and a new finite difference scheme named the optimal central finite difference scheme is used for spatial discretization. The analysis shows that the numerical dispersion of the new method can be reduced to some extent in comparison with that of the former fourth‐order accurate FDTD method while no extra computation cost is involved. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1802–1804, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22605
A novel all‐fiber high velocity interferometer for any reflector
Authors: Hong Guang‐Wei , Jia Bo , Wang Xiang 
Published: May 2007

AbstractA novel all‐fiber high velocity interferometer system for any reflector (AFHVISAR) is proposed and demonstrated. The system mainly consists of two 3 × 3 SM fiber couplers. A quasi‐direct current (QDC) signal directly from the moving surface is obtained and used to offset the QDC component in the interfering signals for more precise phase demodulation. The use of the diffuse surface solves the fringe loss problem induced by the nonparallel movements of the surface. The experiment with a one‐stage light gas gun shows that the AFHVISAR can successfully achieve the surface velocity profile of LY12 aluminum specimen. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2032–2035, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22606
Small printed magnetic dipole
Authors: Rudant L. , Delaveaud C. 
Published: May 2007

AbstractA very compact antenna with magnetic dipole radiation properties is presented. It is horizontally polarized HP with low cross polarization level XPR, it has omnidirectional radiation with a very low ripple in the azimuth cut plane. With a compact design (quarter wavelength square) it is suitable for integration into small WLAN devices. When combined with other radiating elements, this antenna offers new opportunities for diversity system deployment. This antenna can be equally used for propagation channel characterization as a reference for horizontally polarized waves. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1862–1864, 2007; Published online in Wiley Inter‐Science (www.interscience.wiley.com). DOI 10.1002/mop.22617
An extendedZYT‐chart for conjugately characteristic‐impedance transmission lines with active characteristic impedances
Authors: Torrungrueng D. , Chou P. Y. , Krairiksh M. 
Published: May 2007

AbstractIt has been shown recently in the literature that the conjugately characteristic‐impedance transmission lines (CCITLs) implemented by periodically loaded lossless lines can exhibit active characteristic impedances (i.e., negative characteristic resistances). In this case, the magnitude of the voltage reflection coefficient is always greater than or equal to unity for passive load termination. Because of this reason, some modifications to the standard T‐chart, a graphical tool for solving CCITL problems, is necessary. The modified chart is called as an extended ZY T‐chart, where the range of plotting is always outside or on the unit circle of the voltage reflection coefficient Γ plane. It is found that the extended chart depends on the angle ϕ, the argument of the CCITL characteristic impedances, in a complicated fashion. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1961–1964, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22626
60‐GHz CPW‐fed dielectric‐resonator‐above‐patch (DRAP) antenna for broadband WLAN applications using micromachining technology
Authors: Oh Jungsuek , Baek Taejong , Shin Donghoon , Rhee Jinkoo , Nam Sangwook 
Published: May 2007

AbstractA 60‐GHz coplanar waveguide (CPW)‐fed dielectric‐resonator‐above‐patch (DRAP) antenna using micromachining technology is presented. In the proposed structure, the patch is elevated in the air with support of a dielectric‐post, and a rectangular dielectric resonator antenna (RDRA) is fixed above the patch. The size of the RDR is 1 × 0.8 mm2. We introduce a novel use of micromachining technology (solder ball bumping and flip chip bonding) for the first time to exactingly align and bond a small RDRA with a feed‐slot. The fabricated antenna shows broadband characteristics such as −10‐dB bandwidth of 17.5 GHz from 54 to 71.5 GHz, corresponding to a fractional bandwidth of 29.2%. Moreover, the radiation pattern could be measured by integrating the proposed antenna with a 60‐GHz VCO. An antenna gain of about 3.6 dBi at 60 GHz is measured. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1859–1861, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22632
Highly saturated EDFA for gain clamping operation
Authors: Muhd‐Yassin S. Zen , Harun S. W. , Ahmad H. , Abd‐Rahman M. Kamil 
Published: May 2007

AbstractA highly saturated erbium‐doped fiber amplifier (EDFA) that can be used for gain‐clamping is demonstrated. This amplifier utilizes a short length of active fiber to provide a small but maximum gain and a high pump power to enhance the gain dynamic range. The gain for two simultaneous equal strength input signal channels is clamped at 19.3 dB from −34 dBm to −14 dBm with gain variation of less than 1 dB. The corresponding noise figure is obtained at 3.4 dB, which is slightly lower compared with the normal EDFA. This amplifier is expected to have a low transient power excursion since no compensating light is used inside the system. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1815–1816, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22635
Solid‐state 17O NMR study of the electric‐field‐gradient and chemical shielding tensors in polycrystalline amino acids
Authors: Yamada Kazuhiko , Shimizu Tadashi , Tansho Masataka , Nemoto Takahiro , Asanuma Miwako , Yoshida Mitsuru , Yamazaki Toshio , Hirota Hiroshi 
Published: May 2007

AbstractWe have presented a systematic experimental investigation of carboxyl oxygen electric‐field‐gradient (EFG) and chemical shielding (CS) tensors in crystalline amino acids. Three 17O‐enriched amino acids were prepared: L‐aspartic acid, L‐threonine, and L‐tyrosine. Analysis of two‐dimensional 17O multiple‐quantum magic‐angle spinning (MQMAS), MAS, and stationary NMR spectra yields the 17O CS, EFG tensors and the relative orientations between the two tensors for the amino acids. The values of quadrupolar coupling constants (CQ) are found to be in the range of 6.70–7.60 MHz. The values of δiso lie in the range of 268–292 ppm, while those of the δ11 and δ22 components vary from 428 to 502 ppm, and from 303 to 338 ppm, respectively. There is a significant correlation between the magnitudes of δ22 components and CO bond lengths. Since CO bond length may be related to hydrogen‐bonding environments, solid‐state 17O NMR has significant potential to provide insights into important aspects of hydrogen bonds in biological systems. Copyright © 2007 John Wiley & Sons, Ltd.
Normal carbon acid referencing for protein amide hydrogen exchange
Authors: LeMaster David M. , Anderson Janet S. , Hernández Griselda 
Published: May 2007

AbstractMeasurement of the exchange kinetics for amide hydrogens along the protein backbone continues to offer valuable insights into structural stability and conformational dynamics. Since such studies routinely compare samples that differ in solution conditions or mechanical handling, normalization of the relative exchange rates can present a potentially significant source of experimental uncertainty. The carbon acids 1,3‐dimethylimidazolium cation and thiomethylacetonitrile exhibit base catalyzed exchange rates similar to those of the slowly exchanging amides, under conditions typical for protein studies. With 13C enrichment at the acidic carbon position to facilitate selective observation, such carbon acids offer practical internal calibration of exchange. Copyright © 2007 John Wiley & Sons, Ltd.
Experimental and DFT studies on the transmission mechanisms of analogous NMR JCH and JCC couplings in 1‐X‐ and 1‐X‐3‐methylbicyclo[1.1.1]‐pentanes
Authors: Contreras Rubén H. , Esteban Ángel L. , Díez Ernesto , Lochert Ian J. , Della Ernest W. , Tormena Cláudio F. 
Published: May 2007

AbstractThe main aim of this work is to compare the transmission mechanisms for the Fermi contact term of spin–spin couplings, SSCCs, in series 1‐X‐bicyclo[1.1.1]‐pentane, (1), and 1‐X‐3‐methylbicyclo[1.1.1]pentane, (2), and from that comparison to gain insight into some subtle aspects of the FC transmission. To this end, 18 members of the latter series were isotopically enriched in 13C at the methyl position and the following couplings were measured; 1J, 3J and 4J. These three types of SSCCs in (2) are compared, respectively, with 1J, 3J and 4J in (1); these latter values were taken from previous works. Since electron delocalization plays an important role in the transmission of the FC interaction, the natural bond orbital (NBO) method is employed to quantify electron delocalization interactions within selected members of series (1) and (2). It is found that 1J SSCCs in (1) is more efficiently transmitted than 1J SSCCs in (2). On the other hand, 3J and 4J SSCCs in (1) are notably less efficiently transmitted than 3J and 4J SSCCs in (2), although substituent effects on these two SSCCs show the opposite trends. These different efficiencies are rationalized in terms of different σ‐hyperconjugative interactions in both series of compounds. Copyright © 2007 John Wiley & Sons, Ltd.
Experimental and theoretical investigation of NMR 2JHH coupling constant on six‐membered ring systems containing oxygen or sulfur atoms
Authors: Tormena Cláudio F. , Vilcachagua Janaína D. , Karcher Viviane , Rittner Roberto , Contreras Rubén H. 
Published: May 2007

AbstractTheoretical and experimental 2JHH coupling constants for six‐membered rings containing oxygen or sulfur atoms were studied to investigate whether the 2JHH coupling constant can be used for stereoelectronic studies in heterocyclohexanes, instead of 1JCH, because it is well known that experimental measurements of 2JHH coupling constants at low temperature are much easier to determine than the corresponding 1JCH couplings. For all compounds studied here, the 2JHH coupling constants are affected by σ*C–H antibonding occupancy together with bond angle effects. For cyclohexane and oxygen‐containing compounds, the influence on the geminal coupling for Hax‐C2‐Heq and for X1‐C2‐X3 (X = O and C), bond angles are more pronounced than for the sulfur derivatives. Copyright © 2007 John Wiley & Sons, Ltd.
Sperm binding properties and secretory activity of the bovine oviduct immediately before and after ovulation
Authors: Sostaric Edita , Dieleman Steph J. , van de Lest Chris H.A. , Colenbrander Ben , Vos Peter L.A.M. , Garcia‐Gil Nuria , Gadella Bart M. 
Published: June 2007

AbstractThe possibility that differences in hormonal regimes between the two oviducts in the cow around ovulation affects secretory activity of the oviduct epithelial cells and/or sperm–oviduct binding was studied. Oviducts were collected immediately after slaughter at 6 hr before to 5 hr after timed ovulation of 14 normally cyclic cows that had been inseminated (n = 6) or not (n = 8) and material obtained from the same cows was processed in three ways. First, in vivo, after artificial insemination of the cows, low numbers of sperm cells (approx. 15 per oviduct) were found within the entire oviducts as observed by scanning electron microscopy (SEM). Almost all sperm were located in the isthmus and then only on ciliated cells and showed without exception fully matured, intact morphology. Secretory activity of noninseminated oviduct epithelia was induced after ovulation which was most predominant in the pockets of the ipsi‐lateral ampulla compared to the contra‐lateral ampulla (P < 0.01). Second, ex vivo, explants dissected from oviducts of the noniseminated cows were incubated with sperm. In all cases, the sperm bound to the explants in a similar pattern as observed in vivo and this binding was strictly fucose‐dependent. The main difference with in vivo experiments was the high numbers of sperm bound at any site of the oviduct (∼3,000 cells per mm2) indicating the high sperm binding capacity of the oviduct epithelia. Ovulation induced a striking drop in sperm binding capacity in the oviducts and was most pronounced in the isthmus (∼1,300 cells per mm2;P < 0.001) and to a lesser extent in the ampulla (∼2,000 cells per mm2,P < 0.01). Third, in vitro, pieces of tissue dissected from oviducts of the noninseminated cows were cultured to mono‐layers. Culturing epithelial cells resulted in loss of their normal morphological appearance. In all cases, the sperm binding capacity in monolayers was very low (<50 cells per mm2) when compared to corresponding explants (P < 0.0001). Sperm binding to monolayers originating from the isthmus (<25 cells per mm2) was lower than in those from the ampulla (40–50 cells per mm2;P < 0.01) and remained similar after ovulation. In all three approaches, no significant differences were found in sperm–oviduct binding characteristics and sperm‐distribution in the ipsi‐ versus contra‐lateral oviducts. This indicates, that systemic endocrine changes around ovulation rather than specific oviduct changes at the ipsi–lateral oviduct induce secretion in oviduct epithelial cells, and thus induce sperm release. Mol. Reprod. Dev. 75: 60–74, 2008. © 2007 Wiley‐Liss, Inc.
Effects of follicle size and stages of maturation on mRNA expression in bovine in vitro matured oocytes
Authors: Racedo Silvia E. , Wrenzycki Christine , Herrmann Doris , Salamone D. , Niemann Heiner 
Published: June 2007

AbstractTranscription in bovine oocytes: The goal of this study was to unravel the dynamics of transcripts thought to be critically involved in oocyte maturation. The relative abundance (RA) of DYNLL1 (cytoplasmic dynein light chain LC8), DYNC1I1 (cytoplasmic dynein 1 intermediate chain), DCTN1 (dynactin 1; pGlued homolog, the activator of the cytoplasmic dynein complex 1), PMSB1 (proteasome beta subunit 1), PMSA4 (proteasome alfa subunit 4), PAP (poly‐A polymerase) and Cx43 (connexin 43) were determined by semi‐quantitative endpoint RT‐PCR at different stages of IVM, that is, GV, GVBD, MI and MII in oocytes collected from follicles of two different size categories, that is, <2 mm and 2–8 mm. The RA of DYNLL1 and DYNC1I1 were significantly higher in immature oocytes from bigger follicles than in oocytes from small follicles. Messenger RNA expression levels were similar for DCTN1, PMSB1, PMSA4, PAP, and Cx43 in the two groups during the maturation process. RA of DYNLL1, DYNC1I1 and PMSB1 decreased significantly during IVM in oocytes from follicles 2 to 8 mm. The RA for DYNLL1 was significantly higher in GVBD and MI in the oocytes from follicles 2 to 8 mm in size compared to the other group. The higher mRNA expression of DYNLL1 and DYNC1I1 and the diverging dynamics of DYNLL1, DYNC1I1, and PMSB1 mRNA expression during IVM in oocytes from the different follicle categories could be related to the developmental capacity, that is, development to blastocysts after IVF. The differences found between groups of oocytes could serve as a marker to assess the developmental capacity of bovine oocytes. Mol. Reprod. Dev. 75: 17–25, 2008. © 2007 Wiley‐Liss, Inc.