bluuebunny/crossref_metadata_2025_split huggingface dataset:
The influence of surface condition on the metal dusting behavior of cast and wrought chromia forming alloys
Authors: Hermse C. G. M. , Asteman H. , IJzerman R. M. , Jakobi D. 
Published: March 2012

AbstractThe current work investigated the impact of surface condition on the metal dusting behavior of chromia forming alloys. Five commercial alloys were included in the study, wrought 800H, 353MA, and cast G4859, G4852 Micro, and ET45 Micro, these alloys have a chromium and nickel content in the range of 20–35 wt% and 32–45 wt%, respectively. The wrought alloys were tested in a pickled state and the cast alloys with a machined surface, all the alloys were tested using a laboratory ground surface condition for comparison. The exposures were performed using a gas with a composition of 44 vol% CO, 52 vol% H2, 2 vol% CO2, and 2 vol% H2O at a temperature of 600 °C and a pressure of 5.5 bar. The samples were periodically characterized by measuring the mass loss, pit density, pit size, and pit depth. The results show that the pickled surfaces were sensitive toward metal dusting attack while the machined and the ground surfaces had better resistance. This shows that the surface pre‐treatment plays a crucial role.
Effects of the Zr and Mo contents on the electrochemical corrosion behavior of Ti–22Nb alloy
Authors: Yang S. , Zhang D. C. , Wei M. , Su H. X. , Wu W. , Lin J. G. 
Published: March 2012

AbstractTi–22Nb–xZr and Ti–22Nb–xMo (x = 0, 2, 4, 6, in atom percent) were prepared by an arc melting method. The alloys were solution‐treated at 1073 K for 1.8 ks followed by quenching them into ice water, and the electrochemical corrosion behavior in a 0.9% NaCl solution at 25 °C and neutral pH range of the solution‐treated alloys was evaluated by using electrochemical impedance spectroscopy, polarization curves and an equivalent circuit analysis. It was found that the microstructure of the solution‐treated Ti–22Nb alloy mainly contains β phase with small amount of α″ phase, and the addition of Zr or Mo to a Ti–22Nb alloy is efficient to stabilize the β phase. The resulting impedance parameters and passive current densities indicated that the corrosion resistance of the Ti–22Nb alloy was promoted significantly with the addition of Zr and Mo.
Corrosion and biocompatibility of PPy/PEG coating electrodeposited on Ti6Al7Nb alloy
Authors: Mîndroiu M. , Pîrvu C. , Cîmpean A. , Demetrescu I. 
Published: March 2012

AbstractThis work aims to improve the corrosion rate of Ti6Al7Nb alloy and to increase its biocompatibility at the same time, obtaining polymer composite films based on polypyrrole/polyethylene glycol (PPy/PEG). The elaboration method was electrodeposition. FT‐IR analysis was performed in order to emphasize the formation of the PPy‐PEG composite film by incorporating PEG into the polymer structure. The paper is focussed on PEG (400 molecular weight) effect on the corrosion in bioliquids (as tested electrochemical bioliquid was chosen Hank's balanced salt solution) and on the biocompatibility properties. The PPy film significantly improves the biocompatibility of the Ti6Al7Nb alloy. The PEG presence in the polymerization solution leads to more stable composite polymer films on the titanium alloy surface with a better corrosion resistance and a more hydrophilic behaviour comparing with the PPy film. The increase of cell viability and proliferation potential as compared to the PPy film is not important.
Clustering of Coated Droplets in Clay‐Filled Polymer Blends
Authors: Filippone Giovanni , Acierno Domenico 
Published: March 2012

AbstractThe selective positioning of clay platelets at the polymer/polymer interface in a blend with drop/matrix morphology has a contrasting effect: on the one hand, it promotes a refinement of the morphology during the intense flows which occur during melt compounding; on the other hand, it induces coarsening in the course of prolonged slow flows experienced during rheological analysis. Rather than to a usual coalescence process, the increase of the average sizes of the dispersed phase is primarily due to a clustering mechanism of clay‐coated droplets, which keep their individuality inside the clusters because of the elastic connotation of the layered interface.magnified image
Ultrabroadband 8 × 8 Butler matrix designed with the use of multisection directional couplers and phase correction networks
Authors: Wincza Krzysztof , Gruszczynski Slawomir , Sachse Krzysztof , Kuta Stanislaw 
Published: March 2012

AbstractAn innovative approach that allows for realization of ultrabroadband 8 × 8 Butler matrices has been proposed. It is shown that such a matrix can be divided into two pairs of identical 4 × 4 submatrices, which appropriately connected constitute an ultrabroadband 8 × 8 Butler matrix. To achieve broadband operation in terms of amplitude multisection symmetrical coupled‐line directional couplers are used. Moreover, it has been shown that all the required broadband phase shifters can be realized with the use of tandem connections of two 3‐dB/90° directional couplers in conjunction with Schiffman C‐sections. To achieve that, four intentionally selected crossovers have been realized as tandem connections of two 3‐dB/90° coupled‐line directional couplers and appropriate Schiffman C‐sections have been added to the outer channels within each 4 × 4 submatrix. The proposed concept has been used for the design of an 8 × 8 Butler matrix operating in the frequency range 1.8–12 GHz and the measurements of the manufactured network are shown. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1375–1380, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26805
Internal digital video broadcasting‐handheld antenna with a low loss Z‐type hexaferrite for folder‐type mobile phones
Authors: Tang Yingming , Jia Lijun , Zhang Huaiwu , Liu Baoyuan 
Published: March 2012

AbstractIn this article, a new internal antenna with a Bi(Co)‐substituted Z‐type hexaferrite is presented for the digital video broadcasting‐handheld (DVB‐H) reception in folder‐type mobile phones.Using meandered current path on a low‐loss Z‐type hexaferrite substrate, the proposed antenna can be designed with a significantly small volume of 0.69 cm3 yet meeting the requirements of an antenna for the DVB‐H service. Approximately omnidirectional radiation characteristics are obtained. The measured return loss for the operating frequency over the DVB‐H band is better than 3:1 VSWR. In addition, the maximum radiation efficiency of the antenna is 63.7% in this band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1380–1385, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26810
Flexible split‐ring resonator metamaterial structure at microwave frequencies
Authors: Ragi P. Menon. , Umadevi K. S. , Nees Paul. , Jose Jovia , Keerthy M. V. , Joseph V. P. 
Published: March 2012

AbstractThe authors present the fabrication method and resonant properties of a flexible split‐ring resonator (SRR) metamaterial structure at microwave frequencies. The structure is fabricated by chemical etching on a copper film glued on a thin low loss polymer substrate. The resonant properties using a single circular SRR between two monopole antennas were studied and compared with SRR fabricated on rigid circuit board. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1415–1416, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26814
Extending bandwidth of a CPW‐fed monopole antenna using circular arc structure
Authors: Chongcheawchamnan M. , Meelarpkit K. , Julrat S. , Phongchareonpanich C. , Krairiksh M. 
Published: March 2012

AbstractA simple technique to extend bandwidth of a coplanar waveguide‐fed monopole antenna is proposed.This is achieved by bending a straight monopole to a circular arc. The technique is proven with several designs based on electromagnetic simulation where the technique applicability is experimentally demonstrated by a dual‐band monopole. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1412–1415, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26815
A high performance narrowband superconducting filter at Ku‐band
Authors: Li Qirong , Guo Xubo , Cao Bisong , Zhang Xiaoping , Wei Bin , Feng Cheng , Ying Zhijun , Zhang Guoyong , Jin Shichao 
Published: March 2012

AbstractThis letter presents the design, fabrication, and measurements of a high‐temperature superconducting (HTS) filter at 16 GHz with a 100‐MHz bandwidth. The main aspects of achieving high performance narrowband filter at such high frequency are analyzed and addressed. Simple rectangular resonators and end‐coupled structure are used in the design to achieve high quality factor (Q), weak coupling, and good parasitic response. The measurements of the seven‐pole HTS filter, without any tuning, exhibit a high performance. The insertion loss is less than 1.1 dB, equivalent of a resonator Q about 6100. The return loss is better than −15 dB, and the out‐of‐band rejection is over 70 dB up to 29.3 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1514–1516, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26816
Investigation on transmission characteristics of 40 Gb/s optical networks based on duobinary modulation
Authors: Yang Xusheng , Huang Xuguang , Xie Jinling , Zhu Jiahu , Li Guang 
Published: March 2012

AbstractA novel method to generate optical duobinary (ODB) modulation format and its transmission characteristics in 40 Gb/s optical networks, compared with conventional modulation formats such as return‐to‐zero (RZ), non‐RZ, and carrier‐suppressed RZ in cascaded optical networks, is proposed and analyzed in this article. The transmission performances of these four modulation formats in terms of the capability of resisting the nonlinear effect of a fiber is investigated theoretically, for instance, self‐phase modulation, cross‐phase modulation, and four‐wave mixing. The chromatic dispersion tolerance of the four modulation formats mentioned above is also compared. The simulation results clearly show that the ODB modulation format has wider chromatic dispersion tolerance relative to the other formats. Moreover, after long‐haul transmission, the duobinary format signal has the lower bit‐error‐rate and higher receiving sensitivity compared with conventional format signals. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1355–1359, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26817
Brillouin effect characterization in all‐Raman amplified 4 × 40 Gb/s WDM system
Authors: Pontes M. J. , Segatto M. E. V. , Barbero A. P. L. , Rocco Giraldi M. T. M. , Rocha A.M. , Neto B. , Costa J. C. W. , Martinez M. A. G. , Frazao O. , Baptista J. M. , Salgado H. , Teixeira A. L. J. , André P. S. 
Published: March 2012

AbstractThis article analyzes experimentally the limitations observed in a 45 km Raman amplified 4 × 40 Gb/s transmission system operating under multiple pump and single high pump power configurations. A signal‐to‐noise ratio of 19.2 dB, an extinction ratio of 10.4 dB and a jitter of 1097 fs are achieved for moderate pump powers and higher order stimulated Brillouin scattering lines give rise to system degradation for pump power levels more than 0.5 W. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1403–1407, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26827
Fiber optic Fabry‐Perot interferometer based sensor for inspecting cleaved fiber ends
Authors: Kihara Mitsuru , Watanabe Hiroshi , Tanaka Masanori , Toyonaga Masanobu 
Published: March 2012

AbstractWe propose a novel fiber optic sensor for inspecting cleaved optical fiber ends based on Fabry–Perot interferometer.The sensor uses mainly laser diodes, an optical power meter, 3‐dB coupler, and XY lateral adjustment fiber stage. Experimentally obtained fiber end images were in good agreement with scanning electron microscope observation images. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1541–1543, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26829
Baseband complexity comparison of six‐, five‐, and four‐port receivers
Authors: Östh Joakim , Karlsson Magnus , Owais Owais , Serban Adriana , Gong Shaofang 
Published: March 2012

AbstractThe use of six‐port correlators to implement six‐port receivers has been intensively studied. The six‐port receiver can also be modified to a five‐port or a four‐port receiver. However, the six‐, five‐, or four‐port receiver solution requires different baseband processing to recover the baseband In‐phase (I) and Quadrature‐phase (Q) data. A unified mathematical model for the six‐, five‐ and four‐port receivers is presented in this article. Possible solutions to recover the baseband data are discussed and compared. The investigation shows that the six‐port receiver has advantages over the five‐ and four‐port receivers in terms of complexity when analog baseband processing is used. Simulations are conducted to verify the model and to estimate the error vector magnitude versus frequency; the simulation also shows that the six‐port receiver operates over a wider bandwidth than the five‐ or four‐port receiver. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1502–1506, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26833
A novel compact dual‐band antenna for WLAN applications
Authors: Li R.‐H. , Shi X.‐W. , Zhang N. , Wang Y.‐F. , Wang Y.‐J. 
Published: March 2012

AbstractA novel compact printed monopole antenna for wireless local area network (WLAN) applications is presented in this article.The proposed antenna consists of an L‐shaped monopole radiator and an arc‐shaped stub which can produce the required two bandwidths respectively. This antenna, fed by a 50‐Ω microstrip line, has a small size of only 20 mm × 25 mm. A prototype of the dual‐band antenna has been designed, fabricated and measured. Experimental results show that the presented antenna covers 2.2–2.6 GHz and 4.7–6.2 GHz with return loss less than −10 dB. Besides, the antenna has good radiation patterns in both E and H planes. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1476–1479, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26834
Silicon waveguide racetrack resonators with 1.5 μm radius using junction offsets
Authors: Fan Guofang , Sang Wei , Liu Xinhou , Zhen Zhen 
Published: March 2012

AbstractWe demonstrate straight and bent silicon waveguide junctions using the junction offsets.More than 20% reduction (about 0.02 dB) of the junction connection losses are obtained for the junction using 25 nm offset with bent radii 1.5 μm, compared with the junction without the offset. We also show that the performance of the silicon waveguide racetrack resonators can be improved by introducing a lateral offset at the straight‐to‐bent waveguide junctions. About 0.5 dB increase in drop power is observed for the racetrack resonators with junction offset. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1470–1471, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26836
Rhombic slot antenna design with a pair of straight strips and two ∩‐shaped slots for WLAN/WiMAX applications
Authors: Xie J.‐J. , Ren X.‐S. , Yin Y.‐Z. , Zuo S.‐L. 
Published: March 2012

AbstractA novel multiband rhombic slot antenna with a truncated corner is proposed for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications simultaneously. By introducing a pair of straight strips and two etched ∩‐shaped slots, the proposed antenna can operate in multibands. The prototype of the proposed antenna has been successfully constructed and tested. The 10 dB return loss bandwidths of them are 550 MHz (3.15–3.70 GHz) and 920 MHz (5.05–5.97 GHz), respectively, which can cover both the WLAN bands (5.15–5.35 GHz and 5.725–5.825 GHz) and the WiMAX bands (3.4–3.6 GHz and 5.25–5.85 GHz). In addition, good monopole‐like radiation characteristics with sufficient antenna gains are obtained over the operating bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1466–1469, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26837
Nanosecond response electro‐optic switch based on high cost‐effective poled polymeric material
Authors: Jin Lin , Cao Zijian , Meng Jie , Ma Chunsheng , Zhang Daming 
Published: March 2012

AbstractLow cost materials and fabrication techniques are requited for the high cost‐effective optical devices in the field of the optical communication. In this article, a polymer electro‐optic switch operating at 1550 nm has been designed and fabricated. Such a switch is based on a low‐cost guest‐host material by using Disperse Red 1 (DR1) as the guest and poly(methyl methacrylate) (PMMA) as the host. DR1/PMMA can be synthesized easily. An optimal waveguide structure has been proposed. With the coplanar waveguide electrodes and corona poling, a push–pull switch device is achieved. The switch rise time and fall time are 5 and 7 ns, respectively. The insertion loss of the device (3.7‐cm length) is less than 20 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1537–1541, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26839
Study of a novel U‐shaped monopole UWB antenna by transfer function and time domain characteristics
Authors: Gao G. P. , Yang M.K. , Niu S. F. , Zhang J. S. 
Published: March 2012

AbstractA novel U‐shaped monopole antenna suitable for ultrawideband (UWB) application is presented and investigated in this article. The antenna is developed from printed circular disc monopole antenna, and the current distribution evident that the proposed antenna has a similar current. Three steps in ground plane is designed and adjusted to obtain UWB impedance matching. Experimental results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1–10.6 GHz with VSWR < 2. Study of transfer function (magnitude of S21/group delay) and time domain characteristic (waveform/fidelity) indicate a good UWB application behavior for the antenna. The proposed antenna has a compact size, good radiation characteristics, ultra wide bandwidth, and good time‐domain behaviors to satisfy the requirement of the current wireless communications systems. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1532–1537, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26840
A double‐layered printed dipole antenna with parasitic strips
Authors: Zhu Quanjiang , Yang Shiwen , Huang Ming , Nie Zaiping 
Published: March 2012

AbstractA broadband double‐layered printed dipole antenna with parasitic strips is presented.The printed dipole uses a double‐layered structure and is fed by an integrated strip‐line balun. Two pairs of parasitic strips are attached around the dipole to expand the impendence and pattern bandwidth. Measurement results show that the proposed antenna achieves 75% impendence bandwidth (VSWR < 2), operating between 2.5 and 5.5 GHz. Moreover, stable radiation patterns with 6.3–9.1 dBi peak gain and low cross‐polarization are obtained within the bandwidth. An eight‐element printed dipole antenna array is assembled and measured, showing a good performance in the array. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1517–1520, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26841
A novel broad and multiband frequency selective surface
Authors: Ray Arup , Kahar Manisha , Sarkar Sushanta , Biswas Sushanta , Sarkar Debashree , Sarkar Partha P. 
Published: March 2012

AbstractSimulated theoretical results and experimental verifications are presented for a Frequency selective surface with slotted, perfectly conducting square patch elements.The frequency selective surface (FSS) structure acts like a band‐reject filter having three broad stop bands in parts of C, X, and Ku band. Due to symmetrical nature of the design, the FSS is insensitive to variations of RF incidence angle for 90° rotations of the FSS. Simulated theoretical investigations are done by Ansoft Designer® software. Experimental investigation is performed using standard microwave test bench. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1353–1355, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26843
A design method for patch antennas with wide frequency tunable range and stable conical radiation
Authors: Tsai Jia‐Fu , Shih Chuang‐Jiashih , Row Jeen‐Sheen 
Published: March 2012

AbstractA design for patch antennas with a wide‐frequency tuning range is presented. The antenna structure is composed of a top‐loaded monopole and a parasitic shorted ring patch. With a variable capacitor and a microstrip exponentially tapered line, the operating frequency of the antenna can be tuned between two parallel resonant modes, both of which have symmetrical conical radiations. The key parameters of the proposed design are investigated for obtaining a maximum tuning range. A design procedure is also given. The results obtained demonstrate that the proposed antenna design can offer a frequency tuning range of more than 50%, and its radiation is stable within the range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1441–1445, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26846
Passively mode‐locked soliton fiber laser using a combination of saturable absorber and nonlinear polarization rotation technique
Authors: Shahabuddin N. S. , Mohamad H. , Mahdi M. A. , Yusoff Z. , Ahmad H. , Harun Sulaiman Wadi 
Published: March 2012

AbstractAll‐fiber passively mode‐locked (ML) soliton fiber laser is demonstrated based on the combination of two ML mechanisms, single wall carbon nanotube saturable absorber, and nonlinear polarization rotation.The gain medium is a 10‐m long erbium‐doped fiber, which is pumped by a 980‐nm laser diode in a ring configuration. A stable soliton laser is succesfully achieved using the filter, which functions to reshape and maintain the soliton pulse in the cavity. It operates at 1588 nm with a repetition rate of 8.3 MHz and a pulse width of 0.79 ps. The output spectrum shows strong Kelly sidebands indicating that the pulse duration is near the minimum possible value. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1430–1432, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26850
Broadband CPW‐fed circularly polarized square slot antenna with inverted‐L strips for wireless applications
Authors: Rezaeieh Sasan Ahdi , Kartal Mesut 
Published: March 2012

AbstractThis article proposes an impressive design of a circular polarized square slot antenna (CPSSA). The proposed single layer antenna composed of a square ground plane embedded with three unequal sized inverted‐L strips around corners, which are capable of generating a resonant mode for exciting two orthogonal E vectors. Compared to the previous similar CPSSA designs, the axial‐ratio bandwidth of the antenna is increased, more than two times. The designed CPSS antenna with its compact 40 × 40 × 0.8 mm3 size operates over the frequency band between 2.63 and 6.38 GHz for VSWR<2 exhibiting a 71.11% (3–6.1 GHz) circular polarization (CP) bandwidth. Throughout this letter, the improvement process of the axial ratio and S11 properties are presented and discussed in detailed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1399–1402, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26851