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WILEY‐VCH Verlag 2011 Mathematische Nachrichten Vol.284 No.11
<P><B>Abstract</B></P><P>We classify all the embeddings of \documentclass{article}\usepackage{amssymb}\begin{document}\pagestyle{empty}<TEX>$\mathbb {P}_n$</TEX>\end{document}<IMG src='/wiley-blackwell_img/equation/tex2gif-ueqn-2.gif' alt ='equation image'/> in a Grassmannian <I>Gr</I>(1, <I>N</I>) such that the composition with the Plücker embedding is given by a linear system of cubics on \documentclass{article}\usepackage{amssymb}\begin{document}\pagestyle{empty}<TEX>$\mathbb {P}_n$</TEX>\end{document}<IMG src='/wiley-blackwell_img/equation/tex2gif-ueqn-3.gif' alt ='equation image'/>. As a direct corollary, we prove that every vector bundle giving such an embedding, splits if <I>n</I> ⩾ 3. © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim</P>
Lee, Yong-Sub,Lee, Mun-Woo,Kam, Sang-Ho,Jeong, Yoon-Ha Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.6
<P>This article represents analog predistortion linearization of Doherty power amplifier (DPA) using bandwidth reduction of error signal. To verify our methods, two DPAs are implemented using a push-pull GaN HEMT and a push-pull Si LDMOS at 2.14 GHz and tested using the memory-compensated analog predistorter with transistor-based error generators and three-branch nonlinear paths. From the measured four-carrier WCDMA results, the proposed analog predistortion DPAs show the significant linearity improvement. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1313–1316, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25190</P>
A new K-band push-push VCO using a miniaturized hairpin resonator
Lee, Hyun-Wook,Yoon, Ki-Cheol,Nam, Hee,Eo, Yun-Seong,Lee, Jong-Chul Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.3
<P>In this article, a K-band push-push Voltage Controlled Oscillator (VCO) is presented using a miniaturized hairpin resonator (MHR) with a higher loaded quality factor and the reduced circuit area within 50% compared to the conventional one at 9.2 GHz.The MHR combined with the GaAs MESFET varactor shows a tuning range of 140 MHz, and this voltage tunable MHR is used to compose a push-push VCO. It provides the frequency tuning range of 71 MHz with flatness of +0.13 dB, which is increased by 31 MHz compared to the conventional VCO. The voltage controlled push-push oscillator based on the series feedback topology is implemented on 0.54 mm-thick Teflon substrate with a dielectric constant of 2.54. The measurement shows the output power of 1.18 dBm, the fundamental signal power suppression of −33 dBc, and phase noise performance of −86.78 dBc/Hz at 100 kHz offset. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 699–701, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25007</P>
Moon, Yon-Tae,Choi, Woon-Kyung,Choi, Young-Wan Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.7
<P>A broadband linearization method with a novel opto-electrical predistorter was experimentally demonstrated. With the proposed method, the third-order intermodulation distortion was simultaneously enhanced by more than 10 dB for 510 MHz ranges and by 24 dB at 2.2 GHz without any change in electrical circuitry. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1638–1640, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25240</P>
Joo, Jae-Eun,Lee, Kee-Young,Pham, Van-Thoai,Ham, Won-Hun WILEY-VCH Verlag 2007 European Journal of Organic Chemistry Vol. No.
<P>An efficient procedure for synthesizing oxazines was developed by the palladium(0)-catalyzed intramolecular cyclization of a benzamide through a π-allylpalladium(II) complex. Unlike other palladium-catalyzed reactions, the temperature was found to be a key factor in determining the stereochemistry of the oxazine. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/1434193X-2007-2007-10-EJOC200600927-fig000.gif' alt='wiley_img/1434193X-2007-2007-10-EJOC200600927-fig000'> </P>
Rahman, Motiur A. F. M.,Jahng, Yurngdong WILEY-VCH Verlag 2007 European Journal of Organic Chemistry Vol. No.
<P>The geminal diacylates of a variety of aldehydes were prepared in good yields without any catalysts or solvent by simply refluxing the aldehydes with aliphatic acid anhydrides. The scope of the reactions and relative reactivities of aldehydes and acid anhydrides were examined. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/1434193X-2007-2007-2-EJOC200600737-fig000.gif' alt='wiley_img/1434193X-2007-2007-2-EJOC200600737-fig000'> </P>
Lee, Kyung-Hee,Byeon, Song-Ho WILEY-VCH Verlag 2009 European journal of inorganic chemistry Vol.2009 No.31
<P>A new, simple route leading to layered rare-earth hydroxy nitrates was developed. The pH-independent procedure uses ethanol containing alkali-metal hydroxide (KOH, RbOH, or CsOH) as a solvothermal medium. Two new, layered rare-earth hydroxy nitrates (LRHs), Nd<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O and La<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O, were prepared by this nonaqueous solvothermal reaction. Because the RE = Nd and La members have not yet been synthesized in an aqueous system, the successful synthesis of these compounds implies the completion of the RE<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O (RE = rare earths) series. The typical properties of a layered structure was demonstrated by ready ion-exchange reactions between NO<SUB>3</SUB><SUP>–</SUP> and some organic anions such as decanoate, decanesulfonate, and decyl sulfate. In particular, the as-synthesized hydroxide from solvothermal reaction, where the alkali-metal nitrates are partially intercalated in the interlayer gallery, form an aqueous colloidal solution under ultrasonic treatment. Hydration of the LRHs intercalated with alkali-metal salts results in the formation of colloidal LRH suspensions in water. The colloidal character of the LRH solutions is supported by the Tyndall effect, TEM, and AFM images.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)</P> <B>Graphic Abstract</B> <P>A new, simple route was developed to synthesize the complete rare-earth series of the RE<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O family. The hydration of La<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O and Nd<SUB>2</SUB>(OH)<SUB>5</SUB>NO<SUB>3</SUB>·nH<SUB>2</SUB>O synthesized by this nonaqueous solvothermal method yielded transparent aqueous colloidal solutions. <img src='wiley_img/14341948-2009-2009-31-EJIC200900635-fig000.gif' alt='wiley_img/14341948-2009-2009-31-EJIC200900635-fig000'> </P>
Yu, Taekyung,Park, Yong Il,Kang, Min-Cheol,Joo, Jin,Park, Jin Kyung,Won, Ho Youn,Kim, Jae Jeong,Hyeon, Taeghwan WILEY-VCH Verlag 2008 European journal of inorganic chemistry Vol.2008 No.6
<P>Ceria nanocrystals with a cube shape were synthesized from the hydrolytic sol–gel reaction of cerium salt in the presence of oleylamine. The overall synthetic process is very simple and readily applicable to the large-scale synthesis of tens of grams of product in a single reaction in air. These ceria nanocrystals are readily dispersible in aqueous media without the addition of any extra dispersing agent. The aqueous dispersion of the ceria nanocrystals was successfully used as a chemical mechanical polishing slurry, and it exhibited high removal selectivity between silicon oxide and silicon nitride at pH 7.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2008-2008-6-EJIC200700979-fig000.gif' alt='wiley_img/14341948-2008-2008-6-EJIC200700979-fig000'> </P>
Jeong, Byeong-Seon,Wang, Qian,Son, Jong-Keun,Jahng, Yurngdong WILEY-VCH Verlag 2007 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2007 No.8
<P>A versatile method for the total synthesis of cyclic diphenyl ether-type diarylheptanoids, acerogenin C, acerogenin L, (±)-galeon, and (±)-pterocarine was described. The Ullmann reaction of suitably substituted linear diphenylheptanoids was employed for the intramolecular formation of the key ether intermediates as the final step. The prerequisite diarylheptanoids were prepared by a series of cross-aldol condensation reactions from readily available starting benzaldehydes.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/1434193X-2007-2007-8-EJOC200600938-fig000.gif' alt='wiley_img/1434193X-2007-2007-8-EJOC200600938-fig000'> </P>
Lee, Jong Hyeon,Nam, Hye Jin,Rhee, Seog Woo,Jung, Duk-Young WILEY-VCH Verlag 2008 European journal of inorganic chemistry Vol.2008 No.36
<P>Monolayer assemblies of zeolite microcrystals, polymer nanobeads and caged proteins were successfully applied to a highly ordered MgAl-LDH monolayer by using the electrostatic attractions between the negatively charged particles and positively charged MgAl-LDH without chemical modifications. Ultrasonication leads to the monolayer assembly of ZSM-5 microcrystals with a maximum preferred contact over the MgAl-LDH monolayer, where the ZSM-5 microcrystals are oriented in the (0k0) crystallographic direction. PMMA and ferritin were also adsorbed on the monolayer LDH nanocrystal surface through self-assembly in solution. Homogeneous PMMA colloids-LDH composite layers on Si were successfully prepared, thanks to the improved interfacial compatibility between the immobilized LDH and polymer surface charges. Thermal treatment at 150 °C resulted in the formation of continuous polymer coatings over the LDH/Si monolayer. The mixing of colloidal solutions of LDH and PMMA led to the formation of bulk-type polymer-LDH composites after the melting of the polymer phase, where the polymer was homogeneously coated over the LDH crystals without the phase segregation of the LDH nanocrystals. The charged hydroxide layers of the LDH nanocrystals provided the multi-functional interface characteristics required to assemble the functional particles, resulting in the binary hybrid structures of inorganic-inorganic, polymer-inorganic or bio-inorganic composites. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)</P> <B>Graphic Abstract</B> <P>Nanosized PMMA beads were uniformly assembled on LDH nanocrystals through electrostatic interaction to form homogeneous polymer-LDH nanocomposites with conformal polymer layers. <img src='wiley_img/14341948-2008-2008-36-EJIC200800668-fig000.gif' alt='wiley_img/14341948-2008-2008-36-EJIC200800668-fig000'> </P>