bluuebunny/crossref_metadata_2025_split huggingface dataset:
Auxiliary liver transplantation with portal arterialization in the rat: description of a new model
Authors: Aguirrezabalaga Javier , Arnal Francisco , Marini Milagros , Centeno Alberto , Fernandez‐Selles Carlos , Rey Ignacio , Gomez Manuel 
Published: August 2002

AbstractIn recent years, portal arterialization has been used in liver transplantation to increase the portal flow, as a solution for singular technical problems. We have developed a new auxiliary liver transplantation model in the rat with portal arterialization, so the native hepatic hilium remains untouched, consisting on a graft with a previous 70% hepatectomy. It is sited on the right renal bed, joining the infrahepatic inferior vena cava (IVC) of the graft with the recipient IVC. With an abdominal aortic graft, we connect the recipient aorta with the portal vein from the auxiliary liver. All the animals survived at the seventh day. No thrombosis was seen in any graft and an important rejection was observed in all the fields. We have developed a new experimental model of an auxiliary liver with portal arterialization, avoiding the utilisation of the native hepatic hilium, necessary for the possible recovering of the proper liver in the case of a reversible fulminant hepatitis. © 2002 Wiley‐Liss, Inc. MICROSURGERY 22:21–26, 2002 DOI 10.1002/micr.22003
L1 Decay estimates for dissipative wave equations
Authors: Milani Albert , Han Yang 
Published: August 2002

AbstractLet u and v be, respectively, the solutions to the Cauchy problems for the dissipative wave equation

$$u_{tt}+u_t‐\Delta u=0$$\nopagenumbers\end
and the heat equation

$$v_t‐\Delta v=0$$\nopagenumbers\end

We show that, as $t\rightarrow+\infty$\nopagenumbers\end, the norms $\|\partial_t^k\,D_x^\alpha u(\,\cdot\,,t)\|_{L^1({\rm R}^n)}$\nopagenumbers\end and $\|\partial_t^k\,D_x^\alpha v(\,\cdot\,,t)\|_{L^1({\rm R}^n)}$\nopagenumbers\end decay to 0 with the same polynomial rate. This result, which is well known for decay rates in $L^p({\rm R}^n)$\nopagenumbers\end with $2\leq p\leq+\infty$\nopagenumbers\end, provides another illustration of the asymptotically parabolic nature of the hyperbolic equation (1). Copyright © 2001 John Wiley & Sons, Ltd.
Non‐linear singular integral equations on a finite interval
Authors: Junghanns P. , Semmler G. , Weber U. , Wegert E. 
Published: August 2002

AbstractA class of nonlinear singular integral equations of Cauchy type on a finite interval is transformed to an equivalent class of (discontinuous) boundary value problems for holomorphic functions in the complex unit disk. Using recent results on the solvability of explicit Riemann–Hilbert problems, we prove the existence of solutions to the integral equation with bounded piecewise continuous nonlinearities. We discuss the influence of parameters and additional conditions and demonstrate the approach for a free boundary problem arising from seepage near a channel. Copyright © 2001 John Wiley & Sons, Ltd.
Asymptotic convergence of p‐Laplace equationswith constraint as p tends to 1
Authors: Shirakawa Ken 
Published: August 2002

AbstractIn this paper we treat the Euler–Lagrange equation of a functional including the p‐Laplacian for 1<p<2. The limiting equation as $p\searrow1$ corresponds to a steady state problem of a modified Stefan–Gibbs–Thomson problem. We investigate the structure of the limit set of all solutions as $p\searrow1$. Furthermore, we clarify the relationship between the limit set and the solution set of the limiting equation. Copyright © 2002 John Wiley & Sons, Ltd.
Optical code‐division switching network based on simultaneous capacity prime code
Authors: Lee Yang‐Han , Wu Rong‐Hou , Yu Fun 
Published: August 2002

AbstractIn this paper, a novel optical switch OCDSN (optical code‐division switching network) using the simultaneous capacity of the prime code is proposed. Selecting the prime code in accordance with transmission routing forms the basis of this three‐layer network architecture. This network code switching provides one‐to‐one, multicast, and broadcast characteristics. The optimal connection methods and modularized design are proposed. From mathematical analysis, we see that the optical nodes of the OCDSN are less complex than Omega's. And the optical nodes of the modularized P3 OCDSN are almost half in number as compared to the P5 OCDSNs under the same input port conditions. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 336–340, 2001.
Bandwidth enhancement for slotted waveguide spatial power combiners
Authors: Tan W. L. , Coetzee J. C. 
Published: August 2002

AbstractBased on clues taken from the design of antenna arrays, multibranching techniques are used to expand the frequency performance of slotted waveguide power amplifiers. Both simulated and measured results reveal that the use of a corporate feed network may improve the bandwidth of the linear slotted amplifier by up to 50%. © 2002 John Wiley & Sons, Inc. Microwave Opt Technol Lett 32: 285–287, 2002.
Design and optimization of a nonplanar multidipole array using genetic algorithms for mobile communications
Authors: Saha Misra I. , Raychowdhury A. , Mallik K. K. , Roy M. N. 
Published: August 2002

AbstractThis paper presents the application of a genetic algorithm (GA) to the design and optimization of a nonplanar dipole array in light of its application at a cell‐site antenna for mobile communication. Cell‐site antennas demand widely different radiation patterns depending upon the geographical location, terrain, and interference conditions of the cell site. The theoretical analysis for the radiation characteristics of the array is developed first, and subsequently, the GA is applied for obtaining the optimized parameters of the array to obtain the desired pattern as needed in different application areas of the cell site. © 2002 John Wiley & Sons, Inc. Microwave Opt Technol Lett 32: 301–304, 2002.
A simple approach including gate leakage for calculating the minimum noise figure of GaN HEMTs
Authors: Oxley C. H. 
Published: August 2002

AbstractThe article presents a simple noise equation for the first time, including a contribution from the gate leakage, which accurately predicts the experimentally observed relatively flat minimum noise figure NFmin for a GaN HEMT with frequency, published by Lu et al. [1] © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 113–115, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10245
Time‐delay characteristics of in‐room UHF radio propagation channels
Authors: Zhang Y. P. , Wang F. 
Published: August 2002

AbstractThis Letter presents the measured time‐delay characteristics of UHF radio propagation channels in room environments. The measurements used the swept‐frequency technique with a different calibration method. The measured frequency bands include 2.4 GHz, 1.8 GHz, and 900 MHz. The particular interest is devoted to 2.4 GHz; the other two frequency bands were selected for comparison purpose. A simple channel model is derived from the measurement results. The in‐room wideband propagation model is believed to be useful for BER simulation, modem scheme evaluation, and system design. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 115–119, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10248
Long‐wavelength EDFA gain enhancement through 1550‐nm‐band lasing
Authors: Sun Junqiang 
Published: August 2002

AbstractGain enhancement and bandwidth broadening in a long‐wavelength band (L band) EDFA are demonstrated by incorporating an erbium‐doped fiber laser. Utilizing the strong 1550 nm lasing signal used as a secondary pump source, considerable improvements in gain and its bandwidth are achieved. The enhancement of the L‐band gain characteristics is strongly influenced by a secondary pump signal wavelength and its optical power. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 240–242, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10286
A shorted patch antenna with an l‐shaped ground plane for internal mobile handset antennas
Authors: Hsiao Fu‐Ren , Wong Kin‐Lu 
Published: August 2002

AbstractThis letter presents a novel shorted patch antenna for applications as internal mobile handset antennas. Instead of a conventional simple ground plane, the proposed antenna uses an L‐shaped ground plane, which effectively decreases the antenna's backward radiation and enhances the antenna gain. A prototype of the proposed antenna suitable for operating in the UMTS (1920–2170 MHz) band has been constructed, and experimental results are presented. The constructed prototype occupies a small volume of 30 × 17 × 7 mm3, which makes it suitable to be employed as an internal mobile handset antenna, and shows a peak antenna gain of about 3.5 dBi, with gain variations less than 1.2 dBi for frequencies within the UMTS band. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 314–316, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10305
Hybrid fiber radio systems for pico‐cell communications
Authors: Kim Ajung , Ju Young Hoon , Kim Young Soo , Nahm Sang Min 
Published: August 2002

AbstractWe built a test‐bed of a hybrid fiber radio (HFR) system for 60 GHz millimeter‐wave wireless communication. Transmission at 155 Mbps over 24 km of an optical link with a tolerable BER less than 10−6 was achieved over the pico‐radio cell with a radius of 2.6 m, which confirms the feasibility of 60 GHz HFR systems. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 328–330, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10311
Effect of pitch angle on modal propagation characteristics of an annular circular dielectric waveguide having helical windings on the inner and outer boundaries as claddings
Authors: Srivastava S. K. , Pandey P. C. , Singh U. N. , Ojha S. P. 
Published: August 2002

AbstractUsing a fairly rigorous analysis, a general characteristic equation for an annular step‐index fiber with helical windings on the core‐cladding boundaries was derived. We present the modal dispersion characteristics for some lower‐order modes of this dielectric waveguide. We also use the variation of helix pitch angles of the windings and discuss their effect on the dispersion curves of the proposed waveguide. An important property, the presence of band gap, was found for some particular combinations of pitch angles. This may be attributed to the periodicity of the helical structure. We can say that pitch angle acts as a controlling factor for the propagation modes. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 338–344, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10315
Improved perturbation analysis for a new omnidirectional periodic dielectric rod leaky‐wave antenna for millimeter‐wave application
Authors: Xu Shanjia , Lin Kaihui 
Published: August 2002

AbstractThe leakage characteristics of a new millimeter wave omnidirectional periodic circular dielectric rod leaky‐wave antenna are analyzed by an improved perturbation method. The electromagnetic fields are described in terms of a radial transmission‐line network, which brings considerable physical insight into the overall behavior of the leaky‐wave antenna. The analysis yields expression for the leakage constant in a closed form so that the design procedure of the antenna becomes very convenient. It was found that the circular dielectric shell layer greatly affects the leaky characteristics of the antenna. The results obtained by the present analysis are compared with the exact solution based on the mode‐matching method. It is justified that the improved perturbation procedure yields as accurate results as the rigorous method, with extreme simplicity of the analysis and calculations. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 344–346, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10316
Analysis of the effects of walls on indoor wave propagation using the FDTD method
Authors: Ji Zhong , Sarkar Tapan K. , Li Binhong 
Published: August 2002

AbstractThe ray‐tracing technique does not take into account the effects of the inner structure of walls for indoor propagation prediction. A numerical approach to consider this problem using the FDTD method is presented. Numerical results of the path loss calculated by the FDTD method are compared to those obtained by the ray‐tracing technique. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 19–21, 2001.
Broadband patch antenna for E‐band applications
Authors: Vera‐Isasa M. , Pedreira G. , De Lorenzo M. E. , Santalla V. 
Published: August 2002

AbstractA broadband microstrip patch antenna fed by slot coupling is described. The operation frequencies are in the E‐band, and the required bandwidth is about 2 GHz. Results obtained from an antenna design to operate from 40.5 to 42.5 GHz are presented. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 40–42, 2001.
Wavelength‐tuning analysis of erbium‐doped fiber‐ring laser
Authors: Abd‐Rahman M. Kamil , Selvakennedy S. , Poopalan P. , Ahmad Harith 
Published: August 2002

AbstractAn erbium‐doped fiber‐ring laser (EDFL) with more than 50 nm of continuous wavelength tuning was achieved and analyzed through a numerical approach. An angle‐tuned Fabry–Perot etalon was incorporated in the laser cavity as the wavelength‐selective element. The numerical values are in close agreement with the experimental results. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 213–215, 2001.
Refractive‐index profile of fiber optics
Authors: Hindy Moataza A. 
Published: August 2002

AbstractAn optimized approach for obtaining the complex refractive‐index profile of graded‐index fiber optics is presented. The measured optical reflections from the sample are used to minimize the norm of the difference between measured and calculated data. An iterative technique based on a one‐dimensional search in the descent direction is applied for obtaining a new estimate of the refractive‐index profile. Numerical experiments are used to apply the gradient technique in solving optical inverse problems. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 252–256, 2001.
Performance enhancement of the base‐station antennas of mobile communications via the application of resistive plates
Authors: Chou Hsi‐Tseng , Su Po‐Lin 
Published: August 2002

AbstractThe wide intersector coverage overlap and sidelobes of antenna radiation in mobile communications result in irregular handover and unwanted interference. This paper employs techniques based on the application of resistive plates to reduce the interference and enhance the performance by guiding the power to where strong signals are required. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 267–270, 2001.
Efficient evaluation of the half‐space Green's function for fast‐multipole scattering models
Authors: Liu Zhijun , Carin Lawrence 
Published: August 2002

AbstractThere has recently been significant interest in the method‐of‐moments (MoM) and fast multipole method (FMM) for the analysis of scattering from targets in the presence of a lossy dielectric half space (soil). It is desirable to make the analysis of scattering from such a target consistent with use of the free‐space Green's function, to exploit previously developed free‐space scattering models, and for compatibility with the FMM. In this paper, we present a new and simple formulation for Green's‐function evaluation, which is shown to yield efficient and highly accurate scattering results. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 388–392, 2001.
A compact 90° hybrid for MMIC applications
Authors: Avitabile G. , Chellini B. 
Published: August 2002

AbstractA monolithic 20 GHz 90° hybrid is introduced. The hybrid design is based on a lumped‐component approach that makes use of planar coupled inductors. The hybrid model and design technique are discussed. Experiments validating the structure are reported. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 392–394, 2001.
A modified expression for determining the wall thickness of monolithic half‐wave radomes
Authors: Sunil S. , Venu K. S. , Vaitheeswaran S. M. , Raveendranath U. 
Published: August 2002

AbstractA comparison of the wall thickness for a monolithic half‐wave radome at different incidence angles is made by considering the loss tangent of the material used. It is seen that, for large incidence angles and for moderately low‐loss radome materials, the computed wall thickness is different from the values obtained by neglecting the loss tangent of the material. The above context seems to be important, particularly for variable thickness radomes for aerospace applications where the thickness from nose to base varies with the angle of incidence and angle of polarization so as to achieve the optimum design of the radome. An expression for computing the wall thickness is given which is valid for both moderately lossy and very low‐loss radome materials. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 350–352, 2001.
A novel corner reflector antenna
Authors: Joseph V. P. , Mathew K. T. 
Published: August 2002

AbstractA new type of corner reflector (CR) antenna with a rectangular dielectric feed is presented. The radiation characteristics of the wideband CR were studied and compared with a standard corner reflector antenna. It is observed that this novel CR antenna has a wide bandwidth and better performance. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 403–404, 2001.
Invariant face recognition
Authors: Alamand M. S. , Al‐Samman A. F. 
Published: August 2002

AbstractIn this paper, we investigate human face recognition for facial images involving a high degree of in‐plane and out‐of‐plane 3‐D distortions such as rotation. In the proposed technique, we investigate the problem of invariant face recognition by considering four different classes of images. A small subset of images is used for every class to create a composite image, which represents each class. The proposed technique is implemented by using the fringe‐adjusted filter‐based joint transform correlator (JTC) technique due to its superior performance over alternate JTCs and the feasibility of its implementation in the optical domain. Furthermore, the utilization of the synthetic discriminant function to generate the composite image for enhancing the correlation output is also investigated. Computer simulation results are presented to show the validity of the proposed technique. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 418–423, 2001.
Absence of activating mutations in ras and gsp oncogenes in a cohort of nine patients with sporadic pediatric thyroid tumors
Authors: Pauws Erwin , Tummers Rob F.H.M. , Ris‐Stalpers Carrie , de Vijlder Jan J.M. , Voûte Tom 
Published: August 2002

AbstractBackgroundCharacterization of the genetic background of pediatric thyroid carcinomas could aid in distinguishing between differently staged tumors with respect to treatment and prognosis. Two known genetic factors associated with thyroid carcinoma, the proto‐oncogenes gsp and ras were investigated.ProcedureDNA was extracted from paraffin sections from both tumor and normal thyroid tissue of nine patients (ages 9–16 years). Of these patients, eight were diagnosed with papillary carcinoma and one with follicular adenoma. The coding exons of gsp and the three known ras genes (H, K, and N‐ras) were screened for mutations using SSCP‐analysis.ResultsThere were no mutations present in the ras and gsp proto‐oncogenes hot spots, however, LOH of H‐ras (chromosome location 11p15.5) was found in tumor tissue from one patient and a homozygous mutation in exon 12 of gsp causing a Pro→Ser conversion was present in the thyroid tumor tissue from another patient. Two silent polymorphisms were detected, H‐ras exon1, 86T→C and gsp exon 5, 81T→C.ConclusionsOur results indicate that the ras/gsp mutations found are probably late events in the tumorigenesis representing general oncogenic stress. In conclusion, it seems that ras/gsp activation is not a factor in the mechanism causing sporadic thyroid carcinoma in children. Med. Pediatr. Oncol. 36:630–634, 2001. © 2001 Wiley‐Liss, Inc.
1H and 13C spectral assignment of o‐chloroformyl substituted 1,4‐dihydropyridine derivatives
Authors: Suárez Margarita , Martín Nazario , Martínez Roberto , Verdecia Yamila , Molero Dolores , Alba Livan , Seoane Carlos , Ochoa Estael 
Published: August 2002

AbstractThe 1H and 13C NMR spectroscopic data for alkyl 4‐aryl‐6‐chloro‐5‐formyl‐2‐methyl‐1,4‐dihydopyridine‐3‐carboxylates were fully assigned by combination of one‐ and two‐dimensional experiments (DEPT, HMBC, HMQC, COSY, NOE). Copyright © 2002 John Wiley & Sons, Ltd.
PGSE‐WATERGATE, a new tool for NMR diffusion‐based studies of ligand–macromolecule binding
Authors: Price William S. , Elwinger Fredrik , Vigouroux Cécile , Stilbs Peter 
Published: August 2002

AbstractA new pulsed gradient spin‐echo NMR diffusion sequence, PGSE‐WATERGATE, which is based on the extremely efficient WATERGATE solvent suppression sequence, is presented. The sequence is simple to set up and particularly suited to measuring the diffusion coefficients of small ligands in aqueous solution such as is commonly required in pharmaceutical and combinatorial applications. It also affords the possibility of measuring the diffusion of exchangeable resonances, which is often impossible in conjunction with other suppression schemes. Further, a trivial modification of the sequence affords the possibility of multiple solvent suppression, thereby increasing its suitability to LC–NMR applications. The utility of the sequence is demonstrated on the salicylate–bovine serum albumin system. The dissociation constant, Kd, and the number of binding sites were found to be 0.030 M and 33, respectively. Importantly, the extremely high degree of suppression provided by the new sequence allowed the salicylate diffusion coefficients to be measured over a very wide concentration range sufficient to show that the salicylate–bovine serum albumin system is not well described by a simple two‐site model. Previous studies in the literature have been based on data from a smaller concentration range, for which this model gives an apparently good fit. Copyright © 2002 John Wiley & Sons, Ltd.
Two new acylated flavonoid glycosides from Morina nepalensis var. alba Hand.‐Mazz.
Authors: Teng Rongwei , Xie Hongyang , Li Hai Zhou , Liu Xikui , Wang Dezu , Yang Chongren 
Published: August 2002

AbstractFrom the whole plant of Morina nepalensis var. alba Hand.‐Mazz., two new acylated flavonoid glycosides (1 and 2), together with four known flavonoid glycosides (3–6), were isolated. Their structures were determined to be quercetin 3‐O‐[2″′‐O‐(E)‐caffeoyl]‐α‐L‐arabinopyranosyl‐(1→6)‐β‐D‐galactopyranoside (monepalin A, 1), quercetin 3‐O‐[2″′‐O‐(E)‐caffeoyl]‐α‐L‐arabinopyranosyl‐(1→6)‐β‐D‐glucopyranoside (monepalin B, 2), quercetin 3‐O‐α‐L‐arabinopyranosyl‐(1→6)‐β‐D‐galactopyranoside (rumarin, 3), quercetin 3‐O‐β‐D‐galactopyranoside (4), quercetin 3‐O‐β‐D‐glucopyranoside (5) and apigenin 4′‐O‐β‐D‐glucopyranoside (6). Their structures were determined on the basis of chemical and spectroscopic evidence. Complete assignments of the 1H and 13C NMR spectra of all compounds were achieved from the 2D NMR spectra, including H–H COSY, HMQC, HMBC and 2D HMQC‐TOCSY spectra. Copyright © 2002 John Wiley & Sons, Ltd.