bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of a silica nano–composite emulsion resin and study of properties and behaviors
Authors: Dashtizadeh A. , Abdouss M. , Tabarzadi M. , Rahimi A. 
Published: September 2009

AbstractNano‐composite particles were prepared by different methods and we used emulsion co‐polymerization of methyl methacrylate/butyl acrylate monomers mixture in the presence of well‐dispersed silica nano particles to improve physical properties of the base polymers or add proper functions to them. The size distribution and morphology of composite latex particles characterized by dynamic laserlight scattering, Transmission Electron Microscopy and Solid Electron Microscopy. The nano‐composites formed by using two nonionic and anionic surfactants and caused to making two acrylic resins which we studied the adhesion, surface hardness, flammability, gloss brightness and organic solvent resistance of samples. This nano‐composite acrylic resins were specially improved in the flame and solvent resistance. In our test results, we found that by increasing the silica content of nano‐composites, the properties consist of adhesion and gloss decreased, if solvent and flame resistance improved properly.
κ – Ein Maß für nicht kompatibles Werkstoffverhalten
Authors: el Dsoki C. , Nieslony A. , Kaufmann H. , Hanselka H. , Krug P. 
Published: September 2009

AbstractDie weit verbreiteten Methoden zur Beschreibung des zyklischen Werkstoffverhaltens nach Ramberg‐Osgood und Manson‐Coffin‐Basquin sind schon mehrere Jahrzehnte alt. Für verschiedene Werkstoffe wird jedoch festgestellt, dass die sich laut Kompatibilitätstheorie [1, 2, 3] ergebenden Spannungs‐Dehnungs‐Kurven nicht mit den Versuchsergebnissen übereinstimmen. In früheren Arbeiten wurde eine laut Theorie notwendige Methode zur kompatiblen Auswertung vorgestellt [4] und κ als Maß für das inkompatible Werkstoffverhalten eingeführt [5]. In dieser Arbeit wird auf die Bedeutung von κ näher eingegangen und dem Ingenieur die Auswirkungen bei der Vernachlässigung dieser neuen Kenngröße verdeutlicht.
A new approach to the positive mean stress diagram in mechanical design
Authors: Sekercioglu T. 
Published: September 2009

AbstractThe Gerber, modified Goodman, Soderberg, Bagci, ASME‐elliptic and Clemson diagrams are proposed for estimating mechanical element fatigue strength under positive mean and alternating stresses. However, all of these diagrams are either conservative or have fields containing stress greater than yield strength of mechanical element materials. The aim of this study was to propose a new simple diagram with an exponential power k for various types of mechanical element materials. Exponential power k values of steel and Al‐alloy materials were about 0.80 and 0.45, respectively. The proposed diagram (Sekercioglu line) had a minimum average absolute deviation (Xm) of 8.56 %, lower than the Bagci, ASME‐elliptic and Clemson diagrams. The Sekercioglu line can be successfully used in fatigue design processes because of its simple structure and its less conservative nature.
Analyse der Wirkung von Kerben, Mittel‐ und Eigenspannungen auf die Schwingfestigkeit des hochumgeformten Werkstoffbereichs von Spaltprofilen
Authors: Landersheim V. , Eigenmann B. , el Dsoki C. , Bruder T. , Sonsino C. M. , Hanselka H. 
Published: September 2009

AbstractDie Ergebnisse von Schwingfestigkeitsversuchen von Proben, die aus dem stark umgeformten Bereich von Spaltprofilen entnommen wurden, werden dargestellt. Im Fokus steht die Wirkung von Mittelspannungen und Kerben im Zusammenhang mit der vorhergegangenen Umformung. Der Eigenspannungszustand im Bauteil und in den untersuchten Proben wird beschrieben. Numerische Analysen der Schwingfestigkeitsversuche an den Proben unter Berücksichtigung des Eigenspannungszustands ermöglichen es, den Einfluss von Eigenspannungen auf die Versuchsergebnisse rechnerisch zu analysieren. Zur Übertragung der an ungekerbten Proben ermittelten Kennwerte auf gekerbte, bauteilähnlichere Proben wird das Weibullsche Fehlstellen‐Modell angewendet.
Design of a compact microstrip ultra‐wideband bandpass filter at P‐band
Authors: Guo Xubo , Cao Bisong , Zhang Xiaoping , Wei Bin , Peng Huili , Jin Shichao , Lu Xinxiang 
Published: September 2009

AbstractThis letter presents the accurate design of a compact ultra‐wideband bandpass filter with a bandwidth from 400 to 900 MHz. The measured results demonstrate an insertion loss of <0.98 dB and a return loss of 14.9 dB. Furthermore, the theoretical, simulated, and experimental performances are well matched. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2797–2799, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24743
Compact, tunable large group delay line
Authors: Tang Wenjia , Kim Hongjoon 
Published: September 2009

AbstractIn this paper, we present a compact, tunable delay line based on left‐handed nonlinear transmission line (LH NLTL). The widely tunable range of the large group delay is achieved by controlling a reverse bias voltage of series varactors in the LH NLTL. The proposed tunable delay line can be made in a very compact form because its size is dominated by the cascaded varactors. Our experiment shows that the fabricated prototype exhibits tunable group delay between 1.2 and 2.2 ns at a frequency of 1.42 GHz and good return loss. The circuit size is merely 1.6 cm in length. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2893–2895, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24747
Circularly polarized antenna for 2.3–2.7 GHz WiMax band
Authors: Chang The Nan 
Published: September 2009

AbstractA novel circularly polarized antenna fed by a coplanar waveguide is presented. Center conductor of the transmission line is protruded to form a semi‐circular shape and two ground ports of the transmission line are extensively connected to form a closed loop. By tuning width of the closed loop, we can make the return loss and axial ratio bandwidth to cover 2.3–2.7 GHz WiMAX band. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2921–2923, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24749
A compact dual‐band bandstop filter
Authors: Wong Ka Wai , Chiu Leung , Xue Quan 
Published: September 2009

AbstractA compact nonresonating, dual‐band bandstop filter is proposed. By connecting two transmission lines with proper characteristic impedances and phase delay (one is 90° and the other one is 450° in electrical length at center frequency), a dual stopband with two transmission zeros at each stopband is obtained. A prototype is demonstrated for 2.4/5.8‐GHz applications. The measured results show the dual fractional stopband bandwidths with 20‐dB signal attenuation are 25.2% and 12.4%. Also, the theoretical simulation, electromagnetic simulation, and the measured results show good agreement with this simple design. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2952–2954, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24753
Minimum loss condition of a bent rectangular hollow waveguide
Authors: Yamauchi J. , Harada S. , Nakano H. 
Published: September 2009

AbstractThe leakage loss of a hollow dielectric waveguide is analyzed analytically and numerically. A minimum loss condition of a bent rectangular hollow waveguide is derived in terms of the refractive index of the cladding using the perturbation method. The validity of the derived minimum loss condition is confirmed by the beam‐propagation method. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2901–2902, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24761
Compact transversal bandpass filter incorporating microstrip dual‐mode open‐loop resonator and slot line resonator with source‐load coupling
Authors: Zhou Mingqi , Tang Xiaohong , Xiao Fei 
Published: September 2009

AbstractA novel transversal bandpass filter is proposed in this letter. Different from conventional two‐order planar transversal filter, the proposed filter is a three‐order planar transversal filter by incorporating microstrip dual‐mode open‐loop resonator and slot line resonator. Furthermore, by introducing source‐load capacitive coupling, three transmission zeros are created to improve the selectivity of the passband and reject the unwanted signal above the passband. The measured result agrees well with the simulation. The size of the proposed filter is less than 0.15λg × 0.2λg, where λg is the guided wavelength on the substrate. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2927–2929, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24765
Parallelized multilevel characteristic basis function method for solving electromagnetic scattering problems
Authors: Laviada Jaime , Pino Marcos R. , Mittra Raj , Las‐Heras Fernando 
Published: September 2009

AbstractParallel implementation of the multilevel characteristic basis function method is discussed in this article. The use of this method enables us to solve very large electromagnetic problems in a direct manner via a recursive application of the characteristic basis function method. Furthermore, we show that, unlike the iterative schemes, the present method is very well suited for parallelization. Examples are presented to show that upto one million unknown problems can be solved on a workstation using the present scheme, and that the results show very good agreement with those derived by using analytical or fast multipole methods. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2963–2969, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24767
Schemes of optical power splitter nodes for direct ONU–ONU intercommunication
Authors: Yan Minhui , Xu Qing‐Yang , Chen Chih‐Hung , Huan Wei‐Ping , Hong Xiaobin 
Published: September 2009

AbstractIn this study, two schemes of optical power splitter nodes to enable direct local intercommunications between optical network units (ONUs) in a passive optical network (PON) are proposed and analyzed. In comparison with the existing schemes, the new schemes dramatically increase the number of ONUs supported in a PON with the capability of direct local communication. Experimental demonstrations confirm that our proposed schemes can fit into gigabit PON standard by meeting its requirement on the power penalty. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51:2814–2817, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24771
Investigation of radiating jeans‐button antennas
Authors: Floc'h J. M. , Queudet F. , Rmili H. , Fourn E. 
Published: September 2009

AbstractIn this article, a study of radiation performances of standard jeans buttons based on antennas is presented. Few metallic buttons were used as three‐dimensional‐monopole antennas, which are fed by printed microstrip lines on metalized FR4 substrates. The surface‐mounted monopole antennas were simulated, realized, and characterized experimentally. The influence of the button's geometry on the impedance matching and radiation patterns is discussed. In addition, buttons with plastic parts are also studied, and it is found that this type of buttons may allow the antenna miniaturization. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2820–2824, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24784
Two new ultra‐wideband antennas with 3.4/5.5 GHz dual band‐notched characteristics
Authors: Bi Dan‐Hong , Yu Zhi‐Yuan , Mo Shao‐Guo , Yin Xun‐Cai 
Published: September 2009

AbstractThis letter presents two ultra‐wideband (UWB) antennas with 3.4/5.5 GHz dual‐notched bands. The U‐ and V‐slots are used to reject the frequency band (3.3–4.2 GHz) limited by C‐band satellite communication and Wimax systems. Another rejection band (5.15–5.825 GHz), limited by IEEE 802.11b or HIPERLAN/2 system, is obtained by using the U/V‐slot defected ground structure. Experimental results indicate that these antennas cover the entire UWB for voltage standing wave radio <2, except two notched bands. Moreover, these antennas have omnidirectional radiation patterns in the H‐plane and good gain flatness. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2942–2945, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24792
1.8‐dB insertion‐loss planar UWB CMOS bandpass filter with suspended inductors
Authors: Lin Yo‐Sheng , Lu Li‐Chun , Chang Jin‐Fa , Huang Pen‐Li , Lu Shey‐Shi 
Published: September 2009

AbstractThis article demonstrates a low insertion‐loss ultra‐wideband (UWB) CMOS bandpass filter (BP‐filter). Low insertion‐loss was achieved by adopting microstrip‐line (MSL) with optimized ground‐plane pattern as the needed small‐inductance inductors. In addition, to reduce the substrate loss of the large‐inductance spiral inductors, the underneath silicon was removed with the CMOS‐compatible backside inductively coupled plasma deep trench technology. This filter achieved insertion‐loss (1/S21) lower than 3 dB over the frequency range of 4.3–11.2 GHz, stop‐band rejection better than 25 dB over the frequency range of 0–2.3 and 17.4–36.8 GHz, and input return loss (S11) better than −10 dB over the frequency range of 3.1–15.8 GHz. The minimum insertion‐loss was 1.8 dB at 7 GHz. To our knowledge, this is the best result ever reported for a CMOS BP‐filter with operation frequencies higher than 3 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2946–2948, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24806
eIF4E‐Binding proteins are differentially modified after ammonia versus intracellular calcium activation of sea urchin unfertilized eggs
Authors: Oulhen Nathalie , Mulner‐Lorillon Odile , Cormier Patrick 
Published: September 2009

AbstractFertilization of sea urchin eggs triggers a rise of protein synthesis mainly dependent on the cap‐binding protein eIF4E, which is released from its repressor 4E‐BP and associates with eIF4G. Association of eIF4G with eIF4E is a crucial event for the onset of the first mitotic division following fertilization. Artificial activation of unfertilized eggs with the calcium ionophore A23187 results in the activation of protein synthesis comparable to the one triggered by fertilization, while increasing the intracellular pH by ammonia treatment results in partial activation of protein synthesis. Nevertheless, artificial activation does not induce the mitotic division. Here we investigate the effect of calcium ionophore and ammonia treatment of unfertilized eggs on eIF4E and its two antagonist partners, 4E‐BP and eIF4G. We show that the addition of calcium ionophore to unfertilized eggs induces permanent dissociation between eIF4E and 4E‐BP, whereas a reversible dissociation of the complex occurs after ammonia treatment. The regulation of the complex correlates with permanent or reversible 4E‐BP disappearance depending on the treatment used to trigger artificial activation. Furthermore, while calcium ionophore treatment of unfertilized eggs induces eIF4G modifications comparable to those observed following fertilization, ammonia treatment does not. These results suggest that ionophore and ammonia treatments of unfertilized eggs induce differential protein synthesis activation by targeting eIF4E availability and specific regulation through its two partners 4E‐BP and eIF4G. Mol. Reprod. Dev. 77: 83–91, 2010. © 2009 Wiley‐Liss, Inc.
Intravoxel water diffusion heterogeneity imaging of human high‐grade gliomas
Authors: Kwee Thomas C. , Galbán Craig J. , Tsien Christina , Junck Larry , Sundgren Pia C. , Ivancevic Marko K. , Johnson Timothy D. , Meyer Charles R. , Rehemtulla Alnawaz , Ross Brian D. , Chenevert Thomas L. 
Published: September 2009

AbstractThis study aimed to determine the potential value of intravoxel water diffusion heterogeneity imaging for brain tumor characterization and evaluation of high‐grade gliomas, by comparing an established heterogeneity index (α value) measured in human high‐grade gliomas to those of normal appearing white and grey matter landmarks. Twenty patients with high‐grade gliomas prospectively underwent diffusion‐weighted magnetic resonance imaging using multiple b‐values. The stretched‐exponential model was used to generate α and distributed diffusion coefficient (DDC) maps. The α values and DDCs of the tumor and contralateral anatomic landmarks were measured in each patient. Differences between α values of tumors and landmark tissues were assessed using paired t‐tests. Correlation between tumor α and tumor DDC was assessed using Pearson's correlation coefficient. Mean α of tumors was significantly lower than that of contralateral frontal white matter (p = 0.0249), basal ganglia (p < 0.0001), cortical grey matter (p < 0.0001), and centrum semiovale (p = 0.0497). Correlation between tumor α and tumor DDC was strongly negative (Pearson correlation coefficient, −0.8493; p < 0.0001). The heterogeneity index α of human high‐grade gliomas is significantly different from those of normal brain structures, which potentially offers a new method for evaluating brain tumors. The observed negative correlation between tumor α and tumor DDC requires further investigation. Copyright © 2009 John Wiley & Sons, Ltd.
Reproducibility of serial whole‐brain MR Spectroscopic Imaging
Authors: Maudsley A. A. , Domenig C. , Sheriff S. 
Published: September 2009

AbstractThe reproducibility of serial measurements using a volumetric proton MR Spectroscopic Imaging (MRSI) acquisition implemented at 3 Tesla and with lipid suppression by inversion‐recovery has been evaluated. Data were acquired from two subjects at five time points, and processed using fully‐automated procedures that included rigid registration between studies. These data were analyzed to determine coefficients of variance (COV) for each metabolite and for metabolite ratio images based on an individual voxel analysis, as well as for average and grey‐matter and white‐matter values from atlas‐defined brain regions. The volumetric MRSI acquisition was found to obtain data of sufficient quality for analysis over 70 ± 6% of the total brain volume, and spatial distributions of the resultant COV values were found to reflect the known distributions of susceptibility‐induced magnetic field inhomogeneity. Median values of the resultant voxel‐based COVs were 6.2%, 7.2%, and 9.7% for N–acetylaspartate, creatine, and choline respectively. The corresponding mean values obtained following averaging over lobar‐scale brain regions within the cerebrum were 3.5%, 3.7%, and 5.2%. These results indicate that longitudinal volumetric MRSI studies with post‐acquisition registration can provide an intra‐subject reproducibility for voxel‐based analyses that is comparable to previously‐reported single‐voxel MRS measurements, while additionally enabling increased sensitivity by averaging over larger tissue volumes. Copyright © 2009 John Wiley & Sons, Ltd.
Development and testing of an SNMP‐based integrated management system for heterogeneous power line communication networks
Authors: Park Chang‐Keun , Kang Joon‐Myung , Choi Mi‐Jung , Hong James Won‐Ki , Lim Yong‐Hun , Ju Seongho , Choi Moon‐Suk 
Published: September 2009

AbstractPower line communication (PLC) is an evolving technology which uses existing power lines for data transmission. Like any other communication network, PLC networks need to be managed to ensure efficient use of resources and secure operations. Currently, major PLC chip vendors are trying to provide network management solutions based on the Simple Network Management Protocol (SNMP) by developing their own management systems, but they cannot manage heterogeneous PLC networks comprised of PLC devices from various PLC chip vendors. In this paper, we provide our experience of developing and testing an integrated management system for a heterogeneous PLC network based on SNMP. We present our approach for integrated management by defining the common PLC management information base (MIB) and an integrated PLC proxy agent for providing interoperability to legacy PLC devices which do not support the common PLC MIB. We also present the development of an integrated PLC network management system and its test in heterogeneous PLC networks deployed in South Korea. The contribution of our work is to provide a guideline for developing and testing integrated NMSs for any heterogeneous networks including PLC networks. Copyright © 2009 John Wiley & Sons, Ltd.
Prevalence and safety‐relevance of drug‐related problems in German community pharmacies
Authors: Lewinski Daniel , Wind Stefan , Belgardt Christian , Plate Vanessa , Behles Christian , Schweim Harald G. 
Published: September 2009

AbstractPurposeThe purpose of this study was to assess prevalence and characteristics, including safety‐relevance, of drug‐related problems (DRPs) detectable in community pharmacy routine service, and to investigate the influence of relevant risk factors.MethodsPatients in 69 community pharmacies in Berlin were surveyed using a checklist for quality assurance of DRP detection in order to enable quantitative detection. An expert committee assessed the safety‐relevance of detected DRPs by use of an algorithm. Logistic regression analysis was applied to investigate the influence of different risk factors.ResultsOf the 3040 surveyed patients, 638 (21.0%) were affected by DRPs. Among these, 455 (71.3%) had problems of low, 170 (26.6%) of significant and 13 (2.0%) of high safety‐relevance. Significant risk factors identified were self‐medication and new medication, especially new prescriptions. Age, gender and the number of dispensed drugs had little influence on occurrence of DRPs. The two major groups of DRPs were therapeutic errors, often correlating with self‐medication, and information problems, often correlating with new medications. Drug classes most frequently associated with DRPs were analgesics/NSAID, antibiotics, nasal preparations and cough medications.ConclusionDRPs are frequent among patients in German community pharmacies. Advanced research in this field (DRP‐pharmacovigilance) and implementation of methods for quality assurance of pharmaceutical counselling, that is exhaustive DRP detection, may improve the safety of drug therapies significantly. In particular, pharmaceutical counselling is an important instrument for assuring treatment appropriateness and safety of OTC drugs. Copyright © 2009 John Wiley & Sons, Ltd.
Recent advancement on polybenzoxazine—A newly developed high performance thermoset
Authors: Yagci Yusuf , Kiskan Baris , Ghosh Narendra Nath 
Published: September 2009

AbstractPolybenzoxazine is a newly developed addition polymerized phenolic system, having a wide range of interesting features and the capability to overcome several shortcomings of conventional novolac and resole type phenolic resins. They exhibit (i) near zero volumetric change upon curing, (ii) low water absorption, (iii) for some polybenzoxazines Tg much higher than cure temperature, (iv) high char yield, (v) no strong acid catalysts required for curing, (vi) release of no byproduct during curing and also possess thermal and flame retarding properties of phenolics along with the mechanical performance. Though benzoxazine based materials possess several advantages, they have not yet became very attractive to the industries. To improve the mechanical properties and processibility several strategies have been reported including (i) synthesis of benzoxazine monomers with additional functionality, (ii) incorporation of benzoxazine in polymer chain, and (iii) benzoxazine based composites or alloys. In this article, we have discussed about the recent development of benzoxazine chemistry. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5565–5576, 2009