bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: The Catalytic Pinacol Rearrangement of 1,2‐Diols Using an Antimony(V) Salt.
Authors: HARADA T. , MUKAIYAMA T. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Arene 1,4‐Diradical Formation from o‐Dialkynylarenes.
Authors: SEMMELHACK M. F. , NEU T. , FOUBELO F. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Highly Sterically Hindered Carbon Acids: The Intrinsic Reactivity of 5, 5′,5′′‐Trimethyl‐ and 3,3′,3′′,5,5′,5′′‐Hexamethyl‐2,2′,2′′,4,4′,4′′‐ Hexanitrotriphenylmethanes.
Authors: TERRIER F. , XIAO L. , FARRELL P. G. , MOSKOWITZ D. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Oxidative Dehydrogenation of Ethane and the Coupling of Methane over Sodium Containing Cerium Oxides.
Authors: KENNEDY E. M. , CANT N. W. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Nucleophilic Fluorination of Chlorinated N‐Heterocycles with Tetrabutylphosphonium Hydrogendifluoride and Dihydrogentrifluoride.
Authors: UCHIBORI Y. , UMENO M. , YOSHIOKAI H. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Transformation of Amino Acids. Part 9. Chemoenzymatical Synthesis of N6‐Carbamoyl‐D‐4‐thialysine and N7‐Carbamoyl‐D‐homo‐5‐thialysine.
Authors: DRAUZ K. , KOTTENHAHN M. , KLENK H. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: The Structures and Stereochemistry of the Diels‐Alder Adducts from (E)‐ 2‐Styrylchromones. A Revision of the Xanthene Structures.
Authors: LETCHER R. M. , YUE T.‐Y. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Condensed Heterocyclic Lactams. Part 2. Synthesis of New 4‐ Arylquinolin‐2(1H)‐one Derivatives.
Authors: HAZAI L. , DEAK GY. , TOTH G. , SOHAR P. , TAMAS J. , GYOERGY L. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Efficient Synthesis of 3H,5H‐Pyrrolo(3,2‐d)pyrimidin‐4‐one.
Authors: BRAKTA M. , DAVES G. D. JUN. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of 9‐Hydroxyalkyl‐Substituted Purines from the Corresponding 4‐(C‐Cyanoformimidoyl)imidazole‐5‐amines.
Authors: BOOTH B. L. , DIAS A. M. , PROENCA M. F. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Platinum‐Catalyzed Novel Reaction of Nitriles and an Azirine with o‐ Bis(dimethylsilyl)benzene.
Authors: REDDY N. P. , UCHIMARU Y. , LAUTENSCHLAGER H.‐J. , TANAKA M. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A Novel Method for the Preparation of Optically Active Dipeptide. Chemo‐ and Stereoselective Reduction of 2‐Hydroxyimino Amides with Samarium Diiodide.
Authors: MUKAIYAMA T. , YOROZU K. , KATO K. , YAMADA T. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Some Halogenated and Disubstituted Amino Benzylacyclouridine Derivatives.
Authors: PAN B.‐C. , CHEN Z.‐H. , ROWE E. C. , CHU S.‐H. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Developments of the New “Experimental Theory” of Sonochemistry Initiated in Grenoble
Authors: LUCHE J. L. 
Published: July 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Performance evaluation of a multi‐microprocessor simulator for communications networks
Authors: Inamori Hisayoshi , Toda Akira 
Published: July 2007

AbstractA parallel processing simulator, NEWTS, composed of a number of microprocessors has been developed to evaluate communications networks. This paper describes the key design objectives of NEWTS. We examine the memory size required in a processor to simulate an exchange node and synchronization scheme between processors. We also compare the parallel simulator with a serial simulator from the viewpoint of simulation speed. As a result it is shown that one processor can simulate several queues, the method of updating by one clock is an excellent system synchronization scheme from the viewpoint of simulation speed, and the processing capability of NEWTS is nearly proportional to the number of processors.
Performance of dll for PN sequences with bit errors
Authors: Yamarnoto Zenichi , Nomura Tamiya 
Published: July 2007

AbstractTracking performance of DLL (Delay‐Lock Loop) for PN sequences with bit errors is discussed and the relationship between the average bit error rate and the normalized r.m.s. tracking error of one‐Δ DLL, is analyzed using the concept of “error sequence.” As a result, it is clarified that the tracking error is nearly proportional to the average bit error rate pe when the loop band width is narrow and is nearly proportional to Pe when the loop band width is wide. The performance of BPSKC (Binary Phase Shift Keyed Correlation) system is analyzed and compared with conventional noise residual systems. It is demonstrated that the BPSKC system is disadvantageous for the input SNR below a certain level but it has some advantage over other systems for the input SNR beyond this level.
Analysis of roundoff noise in separable‐denominator two‐dimensional digital filters
Authors: Kawamata Masayuki , Kawada Etsuo , Higuchi Tatsuo 
Published: July 2007

AbstractA tradeoff among filter wordlength, processing precision, and processing speed, is an important subject in realtime twodimensional (2‐D) digital filtering. This paper analyzes the roundoff noise in implementing separable‐denominator 2‐D digital filters with finite wordlength. Separable‐denominator 2‐D digital filters with infinite and finite wordlength are described by Roesser's state space model. The output error variance due to roundoff noise in 2‐D digital filters with finite wordlength is obtained in the state‐space formulation. It is shown via equivalent transformations that the output error variance due to roundoff noise in 2‐D digital filters depends slightly on filter structures. The l2‐norm of 2‐D digital filters is defined, and the l2‐norm scaling is introduced to fully utilize the dynamic range without causing excessive overflows. Finally, the validity of the proposed analysis method of the roundoff noise in separable‐denominator 2‐D digital filters and the structural dependency of the roundoff noise are clarified through numerical examples.
Waveguide type power combining amplifiers
Authors: Toyoda Sachihiro 
Published: July 2007

AbstractThis paper is concerned with the waveguide power combining amplifier of reflection type and of transmission type. The structure of the waveguide reflection type power combining amplifier consists of an IMPATT diode (to be called the active element) under a post at the center of the waveguide and of a shorting plunger. At the distanceZin front of the active device, another active device is placed under a post and an inductive window is located atZin front of this second device. On the other hand, the transmission type (power combining) amplifier consists of an active device under a post located atZfrom an inductive window. Another device is placed under a post atZfurther down the waveguide and an exit inductive window atZfrom the second device. The waveguide height of the two amplifiers are 3 mm for which the stability condition is satisfied for the amplifier. Tapered sections are installed from the reduced height waveguide to standard waveguides.The equivalent circuits of the two amplifiers have been derived from the electromagnetic field equations. The experiment of the power combining amplifiers have been performed at the 10‐GHz range. The output power is 2.5 mW to 103 mW when the input power was changed from 0.5 mW to 20 mW. The calculated results from the equivalent circuits agree well with the measured data.
Adaptive filtering with input estimation–a tracking filter with input estimation
Authors: Nomoto Kohei , Nojima Hideo , Sato Chikara 
Published: July 2007

AbstractThis paper proposes a tracking filter to track the maneuvering target, controlled by the input which is unknown to the observer. The method estimates the constant component of the acceleration input, which is then utilized in the estimation and prediction of the position and the velocity. In the constant velocity, straight‐line motion, the acceleration of the moving target is only a perturbation of trajectory by turbulence, etc., which can be considered as a noise in the system. However, in circular motion, a considerably large acceleration is continuously added to the fluctuation. Consequently, the acceleration is divided into the system noise and the bias or deterministic input. The latter component is estimated under the assumption that it changes only slowly. The tracking filter is then constructed using the result of the above analysis to the estimation and prediction of the position and the velocity. The proposed tracking filter aims at the adaptation to the nonstationary motion of the maneuvering target and the tracking to both circular and straight line motions. The filtering can be generalized as a method of state estimation including the estimation of input, and one can expect other applications. Finally, the effectiveness of the proposed filter is demonstrated by a simulation.
Estimation method of direct‐radiator loudspeaker system parameters in low‐frequency range by nonlinear optimization technique
Authors: Nomura Yasuo , Ai Takaharu , Fukuda Keiji 
Published: July 2007

AbstractThis paper proposes an estimation method for the system parameters in the low‐frequency range of the direct‐radiator loudspeaker system. The system parameters considered in this paper are defined by the elements in the electrical and mechanical equivalent circuit in the low‐frequency range. In previous estimations of the system parameters, the impedance measurement was required for the driver speaker in the free space or in the standard box. On the other hand the proposed method can provide estimations for the system parameters, including the proper additional air mass and the effective volume of the box for the driver speaker and the passive radiator (drone cone or port), only by the measurement of the system impedance. Consequently, it is a practically useful method. The estimation is made by minimizing (optimizing) the evaluation function by the nonlinear optimization, which is composed of the square sum of the difference between the measured and calculated impedances at the voice‐coil terminals of the driver speaker at a finite number of discrete frequencies. Eight kinds of methods are examined for efficient estimation. By computer simulation and two examinations, the validity and usefulness of the method are indicated. Since the method can provide estimations of the true system parameters, it can present effective means for the system design.
Electromagnetic scattering by perfectly conducting polygonal cylinders
Authors: Sugimoto Satoru , Kawabata Masayuki , Kozaki Shogo 
Published: July 2007

AbstractAnalytical results by the integral equation method are described for the problem of electromagnetic scattering from perfectly conducting polygonal cylinders with TE and TM wave incidence. This approach is extended to the case of TE wave scattering by a set of perfectly conducting polygonal cylinders. In the presence of several conducting cylinders the mutually interacting surface current densities are used for deriving the integral equations. The latter are reduced to simultaneous equations by step function approximations of the current distributions. Numerical examples include the surface current distributions on a concave conducting cylinder and multiple rectangular cylinders and their scattering patterns as well as the near field distributions, which have not been evaluated extensively to date. It is found that a strong standing wave is caused in the electric field between the rectangular cylinders due to multiple scattering. To confirm validity of the theory, a model experiment is performed at microwave frequency. It is confirmed that the theoretical experimental results are in good agreement. The results of the present paper provide a calculation model for wave propagation in an urban community. They can be used as a basis of such propagation.
An approach to the continuous‐time stability criterion of polynomial matrices via orthogonal polynomial matrices
Authors: Nagaoka Hiroshi , Monden Yoshimi , Arimoto Suguru 
Published: July 2007

AbstractThe stability of a scalar polynomial can be tested by the Routh‐Hurwitz method, but a stability criterion for polynomial matrices is not known yet. A square polynomial matrix D(s) is said to be (continuous‐time) stable when all the zeros of det D(s) have negative real parts. In this paper, orthogonal polynomial matrices (Rj(s); j = 0, 1,…; associated with an inner product are considered in studying the stability of D(s). A recursive algorithm to produce {Rj(s)} is presented which elucidates the relation between the stability and the polynomial matrix structure of D(s). When D(s) is a scalar polynomial the algorithm is shown to be equivalent to the Routh‐Hurwitz test. The results are applied to the construction of the Schwartz‐form realizations and the Routh approximations of multi‐variable linear systems.
Construction and analysis of frame synchronization systems taking into account the channel state
Authors: Fuji Tsuyoshi , Sato Masashi , Kasahara Masao , Namekawa Toshihiko 
Published: July 2007

AbstractWhen a channel falls out of synchronism, the approximate frame sync position can normally be estimated and this fact can be applied in the design of frame synchronization systems. This paper presents a new multicounter method for the realization of a fast frame synchronization system taking into account the probability distribution of the sync position. There are two typical ways of realizing a multicounter system: the intensive method, and the division method. The refraining characteristics of a multicounter system are demonstrated for particular probability distributions of the sync position. It is shown that the multi‐counter method provides a flexible synchronization strategy by taking account of the state of the channel.
Gain/shape vector quantizer for multidimensional spherically symmetric random source
Authors: Saitoh Takahiro , Takeo Hideya , Harashima Hiroshi , Miyakawa Hiroshi 
Published: July 2007

AbstractThe probability density of normalized ac orthogonal transform coefficients of image data can be modeled as a spherically symmetric distribution. On the other hand, the gain/shape vector quantizer [8] proposed by Buzo et al. is expected to provide a good quantization performance and a flexible design method for spherically symmetric random source. Therefore, it may be possible to realize a flexible vector quantizer by designing a gain/shape vector quantizer in the orthogonal transform domain. With this expectation the asymptotic performance and optimal allocation of the number of quantization levels of the gain/shape vector quantizer for an n‐dimensional spherically symmetric random source was derived and it was shown that for n ≤ 10 the gain/shape vector quantizer yields the asymptotic performance between its upper bounds derived by Zador [10] and those by Conway and Sloane [11], and that for n > 11 its asymptotic performance is similar to the Zador's upper bounds. Also, comparison with the asymptotic performance of scalar quantizers [12] was made and it was shown that possible improvement of coding performance can be obtained by applying the gain/shape vector quantizer to orthogonal transform image coding, for which conventionally scalar quantizers have been used. Furthermore, a simple and flexible design method for the suboptimal gain/shape vector quantizer for a given spherically symmetric distribution was presented.
Approximation of characteristics of networks containing several kinds of variable elements
Authors: Kawakami Atsushi 
Published: July 2007

AbstractIn recent years, the problem of synthesis for frequency characteristics containing several independent variable characteristics has become important in various technical fields (mainly measurement‐control systems and communication systems). This paper proposes a method to approximate such frequency characteristics by rational transfer functions containing several kinds of variable parameters. We restrict ourselves for approximated transfer functions to the sum of rational transfer functions containing only one kind of variable parameter from the viewpoint of easiness of the stability test, and network construction. Moreover, a method is proposed to obtain the approximated transfer functions which are stable in the designated variable range of each variable parameter.
Magnetostriction insensitive dual‐mode phase shifter
Authors: Asao Hideki , Matsunaga Makoto , Takeda Fumio 
Published: July 2007

AbstractThe dual‐mode phase shifter is known as a reciprocal ferrite phase shifter. However, in the dual‐mode phase shifter made of ferrite with magnetostrictive effect such as YIG for high power and low insertion loss applications, the reciprocal characteristics of the insertion phase shift is degraded when an external force is applied. This paper shows theoretically and experimentally that this nonreciprocal insertion phase shift is caused by the circumferential magnetization in the Faraday rotator known as the inverse Wiedemann effect, one of the magnetostrictive effects. The paper describes a method for constructing a dual‐mode phase shifter in which the nonreciprocal insertion phase is cancelled and summarizes the results of the trial fabrication. In the dual‐mode phase shifter cancelling the non‐reciprocal insertion phase developed for the X band application, the nonreciprocal insertion phase shift is less than 2 degrees, that is, one‐tenth that in a conventional device made of identical material.
Transient analysis of coupled microstrip‐slot‐line in three‐dimensional space
Authors: Koike Shoichi , Yoshida Norinobu , Fukai Ichiro 
Published: July 2007

AbstractRecently, with a view to obtaining an effective function in microwave techniques, double‐side planar circuit technology is being studied. The microstrip‐slot‐line is one such configuration. By changing the strip width, the dispersion characteristics and the impedance can be adjusted. Use of this transmission line in a number of applications has been studied. With the advances in pulse techniques today, it is necessary to perform a three‐dimensional analysis including the transient response so that the structure is rigorously considered in three‐dimensional space. In this paper, a three‐dimensional analysis in the time domain is performed for this transmission line. It is found that the complicated three‐dimensional electromagnetic field can be related to the static pattern corresponding to the even and odd mode at each instance. Hence it became possible to analyze the effects of the conductor shape and the medium conditions. The characteristic impedances and the effective dielectric constants of the even and odd modes have been calculated from the three‐dimensional electromagnetic field distributions. The results have been compared with available numerical results and fundamental agreement has been found. The analysis has also been performed in the wider range of structural parameters and satisfactory results have been obtained. From the steady‐state characteristics, the transient propagation characteristics have been found and the difference in the dispersion characteristics obtained. The property of this transmission line has been described.