bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative analysis of nutritional quality of five different cultivars of sweet potatoes (Ipomea batatas (L) Lam) in Sri Lanka
Authors: Senanayake Suraji A. , Ranaweera K. K. D. S. , Gunaratne Anil , Bamunuarachchi Arthur 
Published: May 2013

AbstractNutritional attributes of flours obtained from five different cultivars of sweet potato roots commonly available in Sri Lanka showed significant differences in the tested parameters. The starch level ranged between 33% and 64% on the dry basis and the extractability from fresh tubers was governed by the quantity of starch. The crude fiber level ranged between 2.1% and 13.6% on dry basis and the highest level was observed in swp7 (CARI 273) and resistant starch ranged from 14.2% to 17.2%. Higher percentage of resistant starch from total starch was found in Wariyapola red (swp1) cultivar resulting in lower digestion level while higher levels of digestion was evident in cultivars with lower levels of resistant starch with high level of total starch. Low levels of calcium and significant levels of iron were found in the five cultivars studied. Crude protein level was in the range of 1.2–3.3% on dry basis and trypsin inhibitor activity level (TIA) was significantly different (P > 0.05) in the cultivars studied while heating resulted in a significantly high reduction in the TIA level than in unheated condition. Polygonal or round shaped starch granules were in the range of 16.8–23.5 μm and low level of starch digestion was shown in cultivars containing larger granules. Total amylose content lies in the range 15.4–19.6% and cultivars having higher percentage of amylose showed higher level of in vitro pancreatic digestion (Pallepola [swp4] and swp7). The starch digestibility of sweet potato flour was in the range of 36–55% and the highest digestion was observed in swp7. Orange fleshed cultivars (swp4 and swp7) were comparatively rich in nutrients and digestibility than the other three studied cultivars.
Copy neutral loss of heterozygosity is more frequent in older ovarian cancer patients
Authors: Pedersen Brent S. , Konstantinopoulos Panagiotis A. , Spillman Monique A. , De Subhajyoti 
Published: May 2013

Loss of heterozygosity (LOH) is a common type of genomic alterations in ovarian cancer. Analyzing 74,415 copy neutral LOH events in 513 serous ovarian adenocarcinomas samples from the Cancer Genome Atlas, we report that the frequency of LOH events increases with age. Similar trend is observed for LOH involving chromosome 17, which is frequently implicated in ovarian cancer. The results are consistent when we analyze data from the Boston high‐grade serous cancer cohort. We further show that germ line and somatic mutations in BRCA1 (in chromosome 17) and BRCA2 (in chromosome 13) loci are not necessary to establish the pattern. We also report significant age‐related changes in expression patterns for several genes in the homologous recombination (HR) pathway, such as BRCA1, RAD50, RAD52, XRCC2, XRCC3, and MRE11A in these patient samples. Furthermore, we develop a metric for pathway‐level imbalance, and show that increased imbalance in the HR pathway, i.e., increase in expression of some HR genes and decrease in expression of others, is common and correlates significantly with the frequency of LOH events in the patient samples. Taken together, it is highly likely that aging and deregulation of HR pathway contribute to the increased incidence of copy‐neutral LOH in ovarian cancer patients. © 2013 Wiley Periodicals, Inc.
Syntheses, Crystal Structures, Resistivities and Electronic Structures of Hf5Al3‐xSbx (x = 0.70, 1.44, 2.14)
Authors: Huang Wen‐Heng , Chung Ming‐Yan , Lee Chi‐Shen 
Published: May 2013

AbstractThree new hafnium aluminum antimonides Hf5Al3‐xSbx (x = 0.70, 1.44, 2.14) were synthesized from pure elements in an arc‐melting reaction; structures were solved from the X‐ray diffraction data of single crystals. Al and Sb mixing produced two homogeneity ranges; the Mn5Si3 structural type was homogeneous for 0 ≤ x ≤ 1.0, and the W5Si3 structure covered the range 2.0 ≤ x ≤ 2.5. Both structures are condensations of two polyhedrons stacked along the c‐axis. Calculations of the electronic structures revealed substantial contributions from Hf‐Sb interactions; heteroatomic bonding in Hf‐Al and Hf‐Sb contacts affected the stabilities of these two phases. Measurements of the resistivity of polycrystalline samples revealed a dependence on temperature, indicating metallic behavior, consistent with the results of our calculations.
Theoretical Analysis of Fe K‐edge XANES on Mononitrosyl Iron Complex [(NO)Fe(S2C6H4)2][PPN]
Authors: Lee Ya‐Wen , Hsu I‐Jui 
Published: May 2013

AbstractX‐ray absorption spectroscopy (XAS) becomes one of the important techniques to characterize the active metal site of crystalline or non‐crystalline materials. The x‐ray absorption near structure (XANES) of Fe K‐edge is often used to monitor the variation of the oxidation states and the local geometric structures in a series of Fe complexes or in situ reactions such as synthetic catalysts and metalloproteins. We provide a detailed interpretation of Fe K‐edge XANES features on the mononitrosyl iron complex, [(NO)Fe(S2C6H4)2][PPN], based on the theoretical calculation results of FDM (finite difference method) and TDDFT (time‐dependent density functional theory). The pre‐edge peak is mainly the transition of 1s(Fe) → 3dz2(Fe)(mixing with 3pz(S)). The following rising edge to white line region is related to Fe‐S and Fe‐N bonding. To apply the results, we have studied the variation of XANES features with systematically changing of Fe‐N bond lengths. The increasing of Fe‐N bond lengths leads to the XANES feature shifting to lower energy owing to reducing the orbitals overlapped between Fe and N.
Changes in endolysosomal enzyme activities in cerebrospinal fluid of patients with Parkinson's disease
Authors: van Dijk Karin D. , Persichetti Emanuele , Chiasserini Davide , Eusebi Paolo , Beccari Tommaso , Calabresi Paolo , Berendse Henk W. , Parnetti Lucilla , van de Berg Wilma D. J. 
Published: May 2013

ABSTRACTParkinson's disease (PD) is characterized neuropathologically by the cytoplasmic accumulation of misfolded α‐synuclein in specific brain regions. The endolysosomal pathway appears to be involved in α‐synuclein degradation and, thus, may be relevant to PD pathogenesis. This assumption is further strengthened by the association between PD and mutations in the gene encoding for the lysosomal hydrolase glucocerebrosidase. The objective of the present study was to determine whether endolysosomal enzyme activities in cerebrospinal fluid (CSF) differ between PD patients and healthy controls. Activity levels of 6 lysosomal enzymes (β‐hexosaminidase, α‐fucosidase, β‐mannosidase, β‐galactosidase, β‐glucocerebrosidase, and cathepsin D) and 1 endosomal enzyme (cathepsin E) were measured in CSF from 58 patients with PD (Hoehn and Yahr stages 1–3) and 52 age‐matched healthy controls. Enzyme activity levels were normalized against total protein levels. Normalized cathepsin E and β‐galactosidase activity levels were significantly higher in PD patients compared with controls, whereas normalized α‐fucosidase activity was reduced. Other endolysosomal enzyme activity levels, including β‐glucocerebrosidase activity, did not differ significantly between PD patients and controls. A combination of normalized α‐fucosidase and β‐galactosidase discriminated best between PD patients and controls with sensitivity and specificity values of 63%. In conclusion, the activity of a number of endolysosomal enzymes is changed in CSF from PD patients compared with healthy controls, supporting the alleged role of the endolysosomal pathway in PD pathogenesis. The usefulness of CSF endolysosomal enzyme activity levels as PD biomarkers, either alone or in combination with other markers, remains to be established in future studies. © 2013 Movement Disorder Society
A Compact Circularly‐Polarized Antenna with Enhanced Bandwidth for Wban Applications
Authors: Kim Suhwan , Kwon Kyeol , Choi Jaehoon 
Published: May 2013

ABSTRACTIn this study, a compact circularly‐polarized (CP) enhanced bandwidth instrument, scientific, and measurement (ISM) band (2.4–2.485 GHz) antenna with enhanced bandwidth is proposed for wireless body area network applications. To miniaturize the size and widen the CP bandwidth, two y‐shaped strips connected to ground and a partially meandered strip feed line were used. The manufactured antenna has a 10 dB return loss bandwidth of 46% (2170–3290 MHz) and a 3 dB axial‐ratio bandwidth of 29% (2110–2820 MHz). The maximum gain of the antenna is 4.87 dBic. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1738–1741, 2013
Dielectric Properties of Glucose Solutions in the 0.5–67 GHz Range
Authors: Smulders Peter F. M. , Buysse Martin G. , Huang Mingda D. 
Published: May 2013

ABSTRACTThe dielectric properties of glucose solved in pure water as well as in a physiological solution have been measured. The results are considered in the context of noninvasive diabetes control. At least 0.002 percent measurement accuracy is required to achieve the same accuracy as obtained with traditional finger pricking. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1916–1917, 2013
A Low Power and High Conversion Gain 60‐Ghz Cmos Up‐Conversion Mixer Using Current Injection and Dual Negative Resistance Compensation Techniques
Authors: Tsai Tzung‐Min , Lin Yo‐Sheng , Wen Wei‐Chen 
Published: May 2013

ABSTRACTA 60‐GHz double‐balanced mixer for direct up‐conversion using standard 90‐nm CMOS technology is reported. The up‐conversion mixer comprises an enhanced double‐balanced Gilbert cell with current injection for power consumption reduction, and negative resistance compensation for conversion gain (CG) enhancement, a Marchand balun for converting the single local oscillator (LO) input signal to differential signal, and another Marchand balun for converting the differential radio frequency (RF) output signal to single signal. The mixer consumes 8.83 mW and achieves intermediate frequency (IF)‐port input return loss of −12.3 dB at 0.1 GHz, LO‐port input return loss of −15.4 to −26.7 dB, and RF‐port input return loss of −12.1 to −28.5 dB for frequencies 57–64 GHz. At IF of 0.1 GHz, the mixer achieves CG of 2 dB and LO‐RF isolation of 48.8 dB at RF of 60 GHz. The corresponding 3‐dB bandwidth of RF is 4.4 GHz (57.7–62.1 GHz). To the authors' knowledge, the LO‐RF isolation and power consumption are the best results ever reported for a 60‐GHz CMOS/BiCMOS up‐conversion mixer. In addition, the measured output 1‐dB compression point and input third‐order intermodulation point are −10.1 and −2.15 dBm, respectively, at RF of 60 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1830–1836, 2013
A Compact Coupling Controllable Elliptical Filter Based on Multilayer LTCC
Authors: Meng, Fanyi , Ma Kaixue , Yeo Kiat Seng , Boon Chirn Chye , Xu, Shanshan , Lim Wei Meng , Do Manh Anh 
Published: May 2013

ABSTRACTThis paper presents a compact elliptical filter based on modified λ/4 resonators with separated electric and magnetic coupling paths. For the proposed second‐order filters, transmission zero points are generated at either lower or upper stopband by controlling the relative coupling strength in the two paths of inter‐stage resonators. Based on the topology and multilayer LTCC technology, a fourth‐order bandpass filters operating at 5.2 GHz with a fractional bandwidth of 10% in 1.7 mm × 3 mm (0.0785λg × 0.1385λg) is designed and verified experimentally. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1789–1792, 2013
A Novel Design of Microstrip Antenna for Microwave Imaging Application
Authors: Ojaroudi Nasser , Ojaroudi Mohammad 
Published: May 2013

ABSTRACTIn this article, a novel ultrawideband printed monopole antenna for microwave imaging systems is presented. The proposed antenna provides a wide usable fractional bandwidth of more than 160% (2.12–17.87 GHz). The antenna has an ordinary square radiating patch, therefore displays a good omnidirectional radiation pattern even at higher frequencies and also its radiation efficiency is greater than 82% across the entire radiating band. The designed antenna has a small size of 12 × 18 mm2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1755–1758, 2013
Low Cost Refractive Index Sensor Based on Optical Lensed Fiber
Authors: Lin Yu‐Cheng , Liu Chien‐Fu 
Published: May 2013

ABSTRACTA refractive index (RI) sensor based on back reflection of an optical lensed fiber is demonstrated. The sensing device is fabricated by splicing a tiny gradient index fiber (GIF) on the tip of a single mode fiber. Symmetry mirror modeling and fiber coupling efficiency are utilized to estimate the dependence of reflection power on lens pitch. As for sensing test experiments, we measured the reflection power of RI sensor with different concentrations of glycerol solution from 0 to 100% in steps of 20% increasing. The results are consistent with theoretical curve. In terms of the experimental data, important characteristics including resolution and sensitivity are obtained. The RI sensor exhibits high sensitivity −884.62 dB for high RI sensed solution. As the high index GIF spliced on tip of the sensor, it helps to extend the sensing range from 1.45 to 1.472. Due to properties of easy fabrication and low material cost, we believe the RI sensor has potential in mass production and wide application. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1744–1746, 2013
Tunable Multiwavelength Brillouin‐Erbium Fiber Laser Based on Fiber Amplified Loop
Authors: Shaogang, Dai , Xuefang, Zhou , Tianshu Wang 
Published: May 2013

ABSTRACTA novel linear multiwavelength Brillouin‐erbium fiber laser based on a nonlinear fiber amplified loop is demonstrated. The nonlinear fiber amplified loop induces wavelength‐dependent cavity loss and it provides flexibility on controlling the amount of light reflected and transmitted into and out of the laser's cavity. At the Brillouin pump (BP) power of 25 mW and the 980 nm pump power of 200 mW, 21 output channels with 0.08 nm channel spacing are achieved. We realize the tunable output of multiwavelength through adjusting the polarization controller and the BP wavelength. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1741–1743, 2013
Membrane Antenna Arrays Fed by Substrate Integrated Waveguide for V‐Band Communication
Authors: Vettikalladi, Hamsakutty , Lafond Olivier , Himdi Mohamed 
Published: May 2013

ABSTRACTA low‐cost membrane antenna arrays based on FR4 and thin flexible Pyralux substrate for high speed 60 GHz communication systems are proposed. The thin substrate used for making the antenna helps for the easy integration with millimeter wave components and circuits. The low‐cost thin Pyralux substrate with a thickness of 75μm, relative permittivity of εr = 2.4 and tan δ = 0.002 is used. In this article, we are proposing a slot coupled single patch with substrate integrated waveguide (SIW) technology, 1 × 4 antenna array with (a) a combination of SIW and microstrip feed network and (b) SIW complete feed network, and finally a 1 × 16 array of patch antennas fed by complete SIW feed technology. Measurements of the prototypes show good results in terms of impedance bandwidth and antenna gain around 60 GHz. The measured results are in agreement with the numerical simulations. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1746–1752, 2013
90° branch‐line Coupler with Reconfigurable Output Power Ratios
Authors: Batgerel Ariunzaya , Eom Soon‐Young 
Published: May 2013

ABSTRACTThis letter introduces a new 90° branch‐line coupler with reconfigurable output power ratios (90° BC‐ROPR). Unlike a conventional branch‐line coupler structure, each arm of the proposed 90° BC‐ROPR is defined by an asymmetrically coupled‐line, and its characteristic impedance depends on the configuration of the coupled‐line. The main problem that challenged this structure was unwanted loop resonance from the inner transmission lines which form a loop in a disconnected configuration. The proposed structure was designed to obtain 1:1 and 4:1 output power ratios at 3 GHz. Both the simulation and measurement results confirm that the proposed branch‐line coupler successfully dealt with the loop resonance and achieved excellent performance. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1878–1881, 2013
Simultaneous Measurement of Temperature and Force Using a Fiber Bragg Grating on an Open Loop
Authors: Huang Yonglin , Wen Shuaichuan 
Published: May 2013

ABSTRACTSimultaneous measurement of temperature and force based on an open loop using a fiber Bragg grating (FBG) is proposed and demonstrated. A FBG is attached on a special constructed open loop that is composed of two kinds of materials. Using the difference of the Young's modulus and the thermal expansion coefficients for two parts of the FBG, the FBG has two reflection peaks at different wavelength when the temperature and force are applied on the sensor. Two Bragg reflection wavelengths are shift by temperature and force change. Linear response to temperature and force are achieved in the measurable temperature range from 22 to 82°C and in the measurable force range from 0 to 10 N. The value of applied temperature and force can be obtained from the two Bragg wavelength shift via the coefficient matrix. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1800–1802, 2013
Novel Fiber Optic Gas Sensor Based on Photonic Crystal Slow‐Light Waveguide
Authors: Wang Qi , Han Bo , Wu Di , Zhao Yong 
Published: May 2013

ABSTRACTPhotonic crystal was first proposed as a new kind of material in1980s as it can control the movement of the photon which moves in it. In this article, we proposed and demonstrated the theory and method that photonic crystal waveguide (PCW) producing slow light, and slow light enhancing the light–matter interaction and gas molar absorption coefficient. On the basis of this, we proposed and designed a new type of optical fiber gas sensor by utilizing PCW and slow light produced by the PCW. Finally, through theory analysis, we conclude that the sensitivity of this new fiber optic sensor increases 12.56 times and the volume of the system unit is also significantly reduced. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1796–1800, 2013
Influence of Handset Components into the Behavior of a Handset Antenna in a Slotted Ground Plane
Authors: Bujalance Adrian , Picher Cristina , Anguera Jaume , Andújar Aurora , Puente Carles 
Published: May 2013

ABSTRACTThe influence of handset components needs to be analyzed in order to optimize the integration of the antenna into a handset device. Therefore, a multiband handset antenna combining a planar spiral‐shaped monopole and a slotted ground plane is used to study the influence of different components over the antenna performance. The antenna features a suitable behavior to operate in several mobile communication standards such as GSM850, GSM900, GSM1800, GSM1900, UMTS2100, LTE2100, LTE2300, WiFi, and Bluetooth. The effect of a display, a speaker, and a battery has been investigated and recommendation rules are proposed in order to facilitate the integration of those components over the slotted ground plane without degrading the multiband performance. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1770–1779, 2013
Dual‐Band Monopole Antenna with Compact Radiator for 2.4/3.5 GHz WiMAX Applications
Authors: Sun Xiaolei L. , Cheung S. W. , Yuk T. I. 
Published: May 2013

ABSTRACTThe article presents the design of a compact dual‐band monopole antenna with microstrip‐fed for use in wireless devices in the worldwide interoperability for microwave access (WiMAX) system. The radiator of the antenna has a compact size of only 14.5 × 8.7 mm2 and consists of a short stem and two branches generating two frequency bands at around 2.4 and 3.5 GHz for the WiMAX system. The two frequency bands can be easily and independently set using the parameters of the two radiating branches. The antenna performance in terms of reflection coefficient, radiation pattern, peak gain, and efficiency is studied using computer simulation. For verification of simulation results, the antenna is fabricated and measured using the antenna measurement system Satimo Starlab. The feeding cable used to connect the antenna to the measurement system causes substantial discrepancies between the simulated and measured results. To study the cable effects, the feeding cable is modeled and used in computer simulation for studies. With the use of the cable model, the simulated and measured results agree very well. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1765–1770, 2013
A 60‐GHz CMOS Down‐Conversion Mixer with Current‐Reused RF Single‐to‐Differential Converter and Integrated Marchand Balun
Authors: Lee Jen‐How , Lin Yo‐Sheng 
Published: May 2013

ABSTRACTA 60‐GHz double‐balanced mixer for direct down‐conversion using standard 90‐nm CMOS technology is reported. The down‐conversion mixer comprises a double‐balanced Gilbert cell with a current‐reused RF single‐to‐differential converter for conversion gain (CG) enhancement, a Marchand balun for converting the single LO input signal to differential signal, and a baseband amplifier. The mixer consumes 17 mW and achieves low noise figure of 12.8 dB at 60 GHz. In addition, the mixer achieves excellent LO‐RF isolation of 64.7 dB, LO‐IF isolation of 51.5 dB, and RF‐IF isolation of 59.5 dB at RF of 60 GHz and LO of 59.9 GHz. At IF of 0.1 GHz, the mixer achieves maximum CG of 15.46 dB at RF of 62 GHz, and CG of 14.7 dB at RF of 60 GHz, one of the best CG results ever reported for a 60‐GHz CMOS down‐conversion mixer. The corresponding 3‐dB bandwidth of RF is 5.4 GHz (58.7–64.1 GHz). These results demonstrate the proposed down‐conversion mixer architecture is very promising for 60‐GHz direct‐conversion transceiver applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1937–1946, 2013
A Wide Tuning Range CMOS Oscillator Mixer Using A Push–Push Technique for V‐Band Applications
Authors: Ke Po‐Yu , Huang Fan‐Hsiu , Kao Hsuan‐Lin , Chiu Hsien‐Chin 
Published: May 2013

ABSTRACTThis work proposes a wide tuning oscillator mixer that operates from 56 to 64 GHz and is based on 90 nm CMOS technology. The circuit of a voltage control oscillator (VCO) comprises a mixer core and a coupled line marchand balun. The balanced mixer is symmetric, inherently broadband, and dependent on an LO balun that is combined with the parasitic capacitances from the mixer. The VCO is used in a 60 GHz push–pull circuit to generate the second harmonic, and a 30 GHz dielectric resonator is utilized to stabilize the fundamental oscillation frequency. The LC‐tank oscillator also functions as a single‐balanced LO load for the mixer core. A theoretical expression for the conversion gain of the self‐oscillating mixer is given, taking into account the time‐varying nature of the LO load impedance. Measurements show that the mixer has a conversion gain of 3.4 dB. Its output P1 dB is −12.4 dBm. The chip consumes 17.9 mW of dc power and it occupies an area of 0.64 mm2 without pads. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1934–1937, 2013