bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of sharp band‐notched ultra‐wideband antennas using multi‐objective fractional factorial design
Authors: Chen Yen‐Sheng 
Published: December 2015

ABSTRACTA very efficient design technique for sharp band‐notched ultra‐wideband (UWB) antennas is presented. All the design specifications, including enhanced pulse preservation for time‐domain signals and relative constant gains over the passband, can be simultaneously met. Besides, the proposed technique reduces the design effort of multi‐objective evolutionary algorithms by 98%. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:355–359, 2016
Compact dual‐element inverted‐F MIMO antenna system with enhanced isolation
Authors: You Xiaolong , Gao Huotao , Zhou Lin , Zhao Huaqiao 
Published: December 2015

ABSTRACTA compact multiple‐input‐multiple‐output (MIMO) inverted‐F antenna system for time division‐long term evolution (TD‐LTE) E band, 3.50‐GHz worldwide interoperability for microwave access, and 5.20‐GHz wireless local area network with enhanced isolation is proposed. The proposed MIMO antenna system consists of two identical inverted‐F antenna elements operating in the 2.32–2.37/3.40–3.62/5.12–5.29 GHz frequency bands at the reflection coefficient level below −10 dB. The edge‐to‐edge distance between the two antenna elements is only 0.1 mm. The high isolation is achieved by mirror symmetrical orientation of the two antenna elements on the different side of the FR4 substrate and replacing part of the substrate with pieces of copper to connect the ground planes together to form a common ground. The size of the proposed antenna system has the dimensions of 53.00 mm
10.95 mm. The measured isolation between the two antenna elements exceed 19.23 dB, 14.56 dB and 23.74 dB at the aforementioned operation bands, respectively. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:363–368, 2016
A 460‐GHz CMOS substrate‐integrated‐waveguide slot‐antenna design
Authors: Xie Hao , Belostotski Leonid , Okoniewski Michal 
Published: December 2015

ABSTRACTA design of a 460 GHz substrate‐integrated‐waveguide (SIW) slot antenna in a 65‐nm CMOS process is presented in thisarticle. The size of the antenna is 380 μm × 224 μm. An inductor identification layer is placed in the layout to reduce the internal metal density requirements significantly. The proposed antenna, which includes metal dummy fill to be compliant with the 65 nm process design rules, was simulated using HFSS. The antenna simulated with a 0.5 mm Si substrate has a maximum gain of 0.09 dBi and a radiation efficiency of 29.1%. The bandwidth of S11 below −10 dB is 25.3 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:347–351, 2016
Realization of high performance compact CPW‐fed planar UWB antenna using higher order asymmetry for practical applications
Authors: Chakraborty Mrinmoy , Pal Srikanta , Chottoraj Neela 
Published: December 2015

ABSTRACTIn this letter, a novel asymmetric coplanar wave guide‐fed slot antenna is proposed which consist of a combination of triangular and rectangular slot (aperture) with a rectangular stub for practical ultrawideband (UWB) application. Inclusion of higher order asymmetry in the proposed antenna structure helps to broaden the bandwidth considerably by achieving significantly improved impedance variation characteristics (real part of impedance varies between 45 and 55 Ω). The dimensions of the antenna are only 20 mm × 25 mm × 0.8 mm. The designed antenna has broad bandwidth ranging from 3.1 to 12.08 GHz having return loss less than −15 dB in most of the band which produces linear phase characteristics. The proposed antenna has omnidirectional pattern along with almost constant gain with gain variation less than only 0.5 dB in the entire desired operating band. Moreover, the measurement results have excellent concurrence with the simulated ones. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:398–400, 2016
Band‐rejected UWB antenna based on two‐pole band‐stop filter
Authors: Choi Hyung‐Seok , Choi Kyoung , Hwang Heeyong 
Published: December 2015

AbstractThis study proposes a design method of proper two‐pole band‐rejection characteristics on a UWB antenna. This method has advantage of easy accomplishment of the required band‐rejection characteristics of an UWB antenna, such as skirt characteristic, bandwidth, and ripple by directly applying the well‐known band‐rejection filter design procedure without hard iteration or optimization process using an EM‐Simulator. A designed and fabricated antenna by the design method satisfied broad and sharp band‐rejection characteristic at 5 GHz WLAN band with the full UWB band specifications with return losses less than −10 dB. The group delay variations are within 1.0 ns except the rejection band. The band‐stop filter was placed around the radiating patch without degradation on the operation of the main UWB antenna so that it does not need any extra space for the adoption. The proposed method could be useful for designing various wideband antennas with excellent band rejection properties. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:406–409, 2016
Novel dual‐mode bandpass filters using substrate integrated waveguide cavity structure
Authors: Chen Meng‐Yu , Hong Wanchu , Ho Min‐Hua 
Published: December 2015

ABSTRACTThis article proposes dual‐mode balanced bandpass filters (BPFs) with high common‐mode (CM) rejection performance using the substrate integrated waveguide (SIW) cavity and its size‐reduced form, a folded SIW cavity structure. The latter's size (folded cavity) is nearly 50% of the former. The passband response of the proposed dual‐mode balanced BPFs are formed by the (folded) SIW cavities’ two degenerated modes, TE102 and TE201 modes. The advantages of the proposed BPFs are higher Q value and higher power handling capability as compared with those of the microstrip counterparts. The dual‐mode resonance of the SIW cavity also offers the benefit of size reduction and, sometimes, higher Q value than that of its fundamental mode. The hybrid microstrip/slot is used to design the filters’ feed structure for enhancing the CM rejection. This high CM rejection is caused by the noncoupling nature of the slot, which bisected by an imposed perfect magnetic wall. The measured in‐band CM rejection levels are around 40 dB with the differential‐mode insertion losses around 2.5 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:402–406, 2016
A design of LNA and RFVGA with broadband and wide dynamic gain range for digital video broadcasting application
Authors: Liu M. Q. , Wang C. , Kim E. S. , Kim N. Y. 
Published: December 2015

ABSTRACTA low noise amplifier (LNA) and a radio frequency variable gain amplifier (RFVGA) were designed for digital video broadcasting‐satellite second edition (DVB‐S2) receiver tuner integrated circuit using a CMOS 0.18‐μm process. To achieve broadband and dynamic gain range characteristics, a switching filter technique was modified and applied to the LNA. An RFVGA was designed using Gilbert cell topology to achieve the wide dynamic gain range. In addition to the LNA and RFVGA, two 15 dB attenuators were designed and placed in front of the LNA, which can be separated into three voltage gain modes, such as −15 dB, 0 dB, and 15 dB, according to the strength of the input signal power. Good noise performance was achieved in high‐gain mode, and high linearity characteristics were achieved in low‐gain mode. The designed CMOS LNA and RFVGA achieved a 50 dB gain dynamic range, a noise figure below 5.1 dB, an input third‐order intercept point of 13.08 dBm, and an input second‐order intercept point of 24.98 dBm at −15 dB voltage gain with a layout size of the total chip area of 1500 × 600 μm2. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:418–423, 2016
Study on scattering from multilayer rough surfaces with an object buried with FEM/PML
Authors: Xu Run‐Wen , Guo Li‐Xin , He Hong‐Jie , Liu Wei 
Published: December 2015

ABSTRACTThe two‐dimensional electromagnetic scattering properties from multilayer rough surfaces with an object buried were studied in this article by the finite element method (FEM). When FEM is applied to analyze an open‐space scattering problem and an artificial boundary needs to be built to truncate the computational domain. The perfectly matched layer (PML) has been proved to be an accurate boundary condition in the electromagnetic scattering problems. It is widely used in the electromagnetic simulations for limited objects. However, there are few articles provided to deal with the scattering problem of the multilayer rough surfaces. In this letter, the modeling of multilayer rough surfaces with an object buried is presented, and the application of FEM and PML is provided in detail. The method is validated by the method of moments (MoM), and some numerical results are provided to discuss the scattering properties. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:429–433, 2016
A small CPW‐fed UWB antenna with dual band‐notched charectrestics using two stepped impedance resonators
Authors: Sefidi Mehdi , Zehforoosh Yashar , Moradi Shahram 
Published: December 2015

ABSTRACTIn this article, we propose a compact cpw‐fed ultra‐wideband (UWB) antenna with dual band‐notched characteristics. The dual band‐notched are achieved by using two stepped impedance resonators. The measured results show that the proposed antenna has an impedance bandwidth from 2.97 to 10.7 GHz (113%), defined by VSWR<2, with two notched bands, covering all the WiMAX (3.3–3.6 GHz), WLAN (5.2–5.8 GHz), the antenna has a small size (20 × 20 × 1.6 mm3), and almost stable omnidirectional radiation pattern. The proposed antenna is designed, simulated, fabricated, and tested, and the measured results are in good agreement with the simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:464–467, 2016
Orthogonality properties of sub‐structure characteristic modes
Authors: Alroughani Hamad , Ethier Jonathan , McNamara Derek A. 
Published: December 2015

ABSTRACTThe details of a more general form of the sub‐structure characteristic mode concept are presented than previously done. The orthogonality properties of these modes are stated, proven, and discussed. Sub‐structure characteristic modes are interpreted in terms of loading. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:481–486, 2016
The equivalent circuit modeling and application in band‐pass filter of spiral‐shaped defect ground structure
Authors: Mi Xiao , Guoliang Sun , Li Xiaozheng , Zhichun Lei 
Published: December 2015

ABSTRACTIn this article, the equivalent circuit applied lumped elements was proposed to characterize the transmission characteristics of the spiral‐shaped defected ground structure (DGS). Parameters of the equivalent circuit were extracted based on three characteristic frequencies. To verify the feasibility of the equivalent circuit, a third order BPF were designed with two spiral‐shaped DGSs and a microstrip resonator. Then, the proposed equivalent circuit was used to demonstrate the filter responses. The simulation results of the two filters showed good consistency with the analysis results. Finally, the third order BPF was fabricated and measured, the measured results agree well with the simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:445–448, 2016
Matrix pencil method for estimating radar cross‐section of moving targets with near‐field measurements
Authors: Tulgar Okyanus , Ergin Ahmet Arif 
Published: December 2015

ABSTRACTIn this article, an algorithm is introduced for estimating the radar cross‐section of moving targets with near‐field measurements. This algorithm uses the matrix pencil method that facilitates an efficient compensation of range‐Doppler coupling. Furthermore, the scattering centers are extracted from Chirp ISAR data to calculate the radar cross‐section. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:471–477, 2016
A fast, memory efficient and robust sparse preconditioner based on a multifrontal approach with applications to finite‐element matrices
Authors: Aminfar AmirHossein , Darve Eric 
Published: December 2015

SummaryIn this article, we introduce a fast, memory efficient and robust sparse preconditioner that is based on a direct factorization scheme for sparse matrices arising from the finite‐element discretization of elliptic partial differential equations. We use a fast (but approximate) multifrontal approach as a preconditioner and use an iterative scheme to achieve a desired accuracy. This approach combines the advantages of direct and iterative schemes to arrive at a fast, robust, and accurate preconditioner. We will show that this approach is faster (∼2×) and more memory efficient (∼2–3×) than a conventional direct multifrontal approach. Furthermore, we will demonstrate that this preconditioner is both faster and more effective than other preconditioners such as the incomplete LU preconditioner. Specific speedups depend on the matrix size and improve as the size of the matrix increases. The preconditioner can be applied to both structured and unstructured meshes in a similar manner. We build on our previous work and utilize the fact that dense frontal and update matrices, in the multifrontal algorithm, can be represented as hierarchically off‐diagonal low‐rank matrices. Using this idea, we replace all large dense matrix operations in the multifrontal elimination process with O(N) hierarchically off‐diagonal low‐rank operations to arrive at a faster and more memory efficient factorization scheme. We then use this direct factorization method at low accuracies as a preconditioner and apply it to various real‐life engineering test cases. Copyright © 2016 John Wiley & Sons, Ltd.
Successful Outcome With Fludarabine‐Based Conditioning Regimen for Hematopoietic Stem Cell Transplantation From Related Donor in Fanconi Anemia: A Single Center Experience From Turkey
Authors: Kuşkonmaz Barış , Ünal Şule , Bayhan Turan , Aytaç Eyüboğlu Selin , Tavil Betül , Çetin Mualla , Gümrük Fatma , Uçkan Çetinkaya Duygu 
Published: December 2015

BackgroundFanconi anemia (FA) is a heterogeneous autosomal recessive (and rarely X linked) disorder, which is characterized by congenital malformations, progressive bone marrow failure, and predisposition to malignancies. Hematopoietic stem cell transplantation (HSCT) is the only definitive treatment for the hematological manifestations in FA.ProcedureTwenty‐seven patients with FA underwent HSCT using fludarabine (Flu) based regimen at our center between April 2004 and May 2014. One patient who developed acute leukemia before HSCT was excluded from the study. The remaining 26 patients were included. The median age of the patients at the time of transplantation was 9.6 years (range 5.6–17.0 years) and male/female ratio was 19/7. Donors were Human leukocyte antigen (HLA)‐identical sibling in 18 patients, HLA‐identical other relatives in six patients, and HLA 1‐antigen mismatched sibling in two patients. Conditioning regimen consisted of Flu, cyclophosphamide, and antithymocyte globulin.ResultsAll patients engrafted but one developed poor graft function and underwent second HSCT. Acute graft versus host disease (GVHD) (≥grade 2) occurred in two patients (7.6%) and chronic GVHD in one patient (3.9%). Three patients developed venoocclusive disease (11.5%). Survival rate was 96.2% (25/26) at a median follow‐up of 54 months (10–131 months) and all patients who survived were in good clinical condition. None of the patients developed secondary malignancy during the follow‐up period.ConclusionsThe present study from Turkey, a middle‐income country, shows successful transplant outcome with low toxicity using Flu‐based conditioning in patients with FA who underwent HSCT from HLA‐related donors.
Outcomes Following Discontinuation of E. colil‐Asparaginase Upon Severe Allergic Reactions in Children With Acute Lymphoblastic Leukemia
Authors: Yen Hsiu‐Ju , Chang Wan‐Hui , Liu Hsi‐Che , Yeh Ting‐Chi , Hung Giun‐Yi , Wu Kang‐Hsi , Peng Ching‐Tien , Chang Yu‐Hsiang , Chang Te‐Kao , Hsiao Chih‐Cheng , Sheen Jiunn‐Ming , Chao Yu‐Hua , Chang Tai‐Tsung , Chiou Shyh‐Shin , Lin Pei‐Chin , Wang Shih‐Chung , Lin Ming‐Tsan , Ho Wan‐Ling , Chen Yu‐Chieh , Liang Der‐Cherng 
Published: December 2015

BackgroundDiscontinuation of E. coli l‐asparaginase in patients with acute lymphoblastic leukemia (ALL) is unavoidable upon severe allergic reaction. We sought to examine outcomes following E. coli l‐asparaginase discontinuation due to severe allergic reactions.ProcedureWe evaluated the outcome of children enrolled in Taiwan Pediatric Oncology Group‐2002‐ALL protocol between 2002 and 2012, who had E. coli
l‐asparaginase discontinued due to severe allergic reactions, and compared the outcomes of those who continued with Erwinia l‐asparaginase (Erwinase) with those who did not.ResultsAmong 700 patients enrolled in this study, 33 patients had E. coli
l‐asparaginase treatment discontinued due to severe allergic reactions. Five‐year overall survival did not differ significantly among the 648 patients without discontinuation (81 ± 1.6%, mean ± SE), compared to 17 patients with allergic reactions and treated with Erwinase (88 ± 7.8%) and 16 patients with allergic reactions but not treated with Erwinase (87 ± 8.6%). Among 16 patients who did not receive Erwinase, all 10 who received ≥50% of the scheduled doses of E. coli
l‐asparaginase before discontinuation survived without events.ConclusionsErwinase treatment may not be needed for some ALL patients with severe allergy to E. coli
l‐asparaginase if ≥50% of prescribed doses were received and/or therapy is augmented with other agents.
Synthesis and characterizations of new isotactic homopolyesters, statistical and block copolyesters derived of poly((S)‐3,3‐dimethylmalic acid) via the lactone route
Authors: Belibel Rima , Azzouz Imadeddine , Barbaud Christel 
Published: December 2015

ABSTRACTThis article presents the synthesis of a new family of synthetic isotactic polyesters derived from poly((S)‐3,3‐dimethylmalic acid) (PDMMLA). These polyesters are prepared via the lactone route bearing functionalized groups in its main or side chain. The aim of this work is twofold: metabolism and stereochemistry. First, the synthesis of these new polyesters is chosen to provide biodegradable polyesters biocompatible and bioassimilable by the human body. Next, the molecular chain of this family contains a stereogenic center in the aim to provide 100% isotactic homopolymers and copolymers (statistical and block). Finally, these polymers have been characterized by several analytical techniques: FTIR, 1H and 13C NMR, SEC, DSC, and TGA. The greatest importance will be given to the 13C NMR and DSC to principally confirm the stereoregularity and crystallinity of these stereopolyesters. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 1495–1507
TNF-α Inhibits FoxO1 by Upregulating miR-705 to Aggravate Oxidative Damage in Bone Marrow-Derived Mesenchymal Stem Cells during Osteoporosis
Authors: Liao Li , Su Xiaoxia , Yang Xiaohong , Hu Chenghu , Li Bei , Lv Yajie , Shuai Yi , Jing Huan , Deng Zhihong , Jin Yan 
Published: December 2015

Abstract
Decline of antioxidant defense after estrogen deficiency leads to oxidative damage in bone marrow-derived mesenchymal stem cells (BMMSCs), resulting a defect of bone formation in osteoporosis. Forkhead box O1 (FoxO1) protein is crucial for defending physiological oxidative damage in bone. But whether FoxO1 is involved in the oxidative damage during osteoporosis is largely unknown. In this study, we found that FoxO1 protein accumulation was decreased in BMMSCs of ovariectomized mice. The decrease of FoxO1 resulted in the suppression of manganese superoxide dismutase (Sod2) and catalase (Cat) expression and accumulation of reactive oxygen species (ROS), inhibiting the osteogenic differentiation of BMMSCs. The decline of FoxO1 protein was caused by tumor necrosis factor-alpha (TNF-α) accumulated after estrogen deficiency. Mechanistically, TNF-α activated NF-κB pathway to promote microRNA-705 expression, which function as a repressor of FoxO1 through post-transcriptional regulation. Inhibition of NF-κB pathway or knockdown of miR-705 largely prevented the decline of FoxO1-mediated antioxidant defense caused by TNF-α and ameliorated the oxidative damage in osteoporotic BMMSCs. Moreover, the accumulated ROS further activated NF-κB pathway with TNF-α, which formed a feed-forward loop to persistently inhibiting FoxO1 protein accumulation in BMMSCs. In conclusion, our study revealed that the decline of FoxO1 is an important etiology factor of osteoporosis and unclosed a novel mechanism of FoxO1 regulation by TNF-α. These findings suggested a close correlation between inflammation and oxidative stress in stem cell dysfunction during degenerative bone diseases.
Promotion of Cortical Neurogenesis from the Neural Stem Cells in the Adult Mouse Subcallosal Zone
Authors: Kim Joo Yeon , Choi Kyuhyun , Shaker Mohammed R. , Lee Ju-Hyun , Lee Boram , Lee Eunsoo , Park Jae-Yong , Lim Mi-Sun , Park Chang-Hwan , Shin Ki Soon , Kim Hyun , Geum Dongho , Sun Woong 
Published: December 2015

AbstractNeurogenesis occurs spontaneously in the subventricular zone (SVZ) of the lateral ventricle in adult rodent brain, but it has long been debated whether there is sufficient adult neurogenesis in human SVZ. Subcallosal zone (SCZ), a posterior continuum of SVZ closely associated with posterior regions of cortical white matter, has also been reported to contain adult neural stem cells (aNSCs) in both rodents and humans. However, little is known whether SCZ-derived aNSC (SCZ-aNSCs) can produce cortical neurons following brain injury. We found that SCZ-aNSCs exhibited limited neuronal differentiation potential in culture and after transplantation in mice. Neuroblasts derived from SCZ initially migrated toward injured cortex regions following brain injury, but later exhibited apoptosis. Overexpression of anti-apoptotic bcl-xL in the SCZ by retroviral infection rescued neuroblasts from cell death in the injured cortex, but neuronal maturation was still limited, resulting in atrophy. In combination with Bcl-xL, infusion of brain-derived neurotropic factor rescued atrophy, and importantly, a subset of such SCZ-aNSCs differentiated and attained morphological and physiological characteristics of mature, excitatory neurons. These results suggest that the combination of anti-apoptotic and neurotrophic factors might enable the use of aNSCs derived from the SCZ in cortical neurogenesis for neural replacement therapy.
An evaluation of excrement as an alternative to blood for characterizing lead exposure in bald eagles
Authors: Reiter‐Marolf William J. , Dinsmore Stephen J. , Blanchong Julie A. 
Published: December 2015

ABSTRACTLead (Pb) exposure in free‐flying bald eagles (Haliaeetus leucocephalus) is an important conservation concern. One of the challenges to characterizing the magnitude of Pb exposure in free‐flying bald eagles is obtaining samples. Although blood samples are the most commonly used biomarker to quantify Pb exposure in living animals, the potential for negative impacts resulting from handling bald eagles make blood sampling less than ideal in a large‐scale field study. We partnered with wildlife rehabilitators, who simultaneously collected blood and excrement samples from bald eagles admitted for rehabilitation in Iowa, USA, 2012 and 2013, to determine whether excrement could provide information comparable to blood about Pb exposure. We used linear regression to examine the relationship between excrement and blood Pb levels from 45 bald eagles admitted for rehabilitation and found that excrement Pb levels were statistically significantly related to blood Pb levels (P < 0.01, R2 = 0.68). Specifically, when excrement Pb levels were low, blood Pb levels were also low. We also found patterns in Pb levels as a function of sex, age, season admitted, and fate. We conclude that excrement has the potential to be a valuable tool for investigating Pb exposure in bald eagles. © 2015 The Wildlife Society.