bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estudio descriptivo del uso de dosis única de heparina no fraccionada en pacientes en hemodiálisis.
Authors: Parvina De la O Gessica , Loza César , Cieza Javier 
Published: March 2016

Objetivo: Evaluar la evolución de la anticoagulación con dosis única de heparina no fraccionada (HNF) de pacientes en hemodiálisis. Material y métodos: Evaluamos 31 pacientes en hemodiálisis crónica, quienes recibieron HNF 30UI/Kg/hora en bolo único, obteniéndose una muestra de sangre al inicio, 5, 60, 120 minutos y al final de la hemodiálisis, midiéndose el tiempo parcial de tromboplastina activada (TTP) en cada punto para determinar el nivel de anticoagulación. Resultados: La relación de TTP al inicio fue de 1,22 ± 0,49, de ellos, trece pacientes (41,94%) ingresaron con relación de TTP anormal. Los valores de relación de TTP en todos los pacientes a los 5’ y a los 60’fueron mayores a 6,9 (TTP > 300 segundos); a los 120’ once de ellos (35,8%) presentaron valores de relación deTTP mayores a 6,9 y veinte pacientes (64,52%) tuvieron una media de 5,59 ± 1,35; estando todos por encima del rango terapéutico recomendado. Al final del procedimiento la media de la relación TTP fue 2,17 ± 0,75 y sólo 4 pacientes mostraron relación de TTP por debajo del rango terapéutico. Se evidenciaron dos episodios de hemorragia macroscópica sin complicaciones y no hubo variación en la reducción del volumen efectivo de los dializadores. Conclusión: El empleo de heparina no fraccionada en bolo único durante la hemodiálisis presenta una anticoagulación muy por encima de los valores terapéuticos y se prolongan hasta el final de la hemodiálisis; por lo que se recomienda el desuso de esta práctica.(Rev Med Hered 2011;22:103-107).
Quiste hidatídico cardiaco en un niño. Presentación de un caso.
Authors: Castillo De la Cadena Luis , Cuba Yany , Mendoza Carlos , Mispireta Martín , Parra José , Pacheco Primo 
Published: March 2016

El quiste hidatídico es una enfermedad parasitaria humana causada por el estado quístico del parasito Echinococcus granulosus. En el Perú la prevalencia de hidatidosis humana en los últimos 5 años oscila de 7 – 11 / 100 000 habitantes. Se localizan principalmente en hígado (> 65% de los casos) y en pulmones (25%). La localización cardiaca es infrecuente; reportándose entre 0,5 a 2%. Presentamos el caso de un niño de 11 años con quiste hidatídico cardíaco tratado quirúrgicamente utilizando circulación extracorpórea y clamplaje aórtico, en forma exitosa.
Linfoma no Hodgkin de presentación ósea. Reporte de un caso.
Authors: Málaga Germán , Mogrovejo Estela , Marín Enma , Cáceres Jaime 
Published: March 2016

Se describe el caso de un varón de 15 años con cuadro clínico caracterizado por dolor y aumento de volumen de la rodilla derecha, fiebre, diaforesis, cefalea, ganglios palpables y pérdida de peso. En la radiografía y RMN de rodilla se encontró acentuada alteración de la epífisis y metáfisis proximal de la tibia y de la metáfisis distal del fémur. La biopsia e inmunohistoquímica fueron compatibles con linfoma no-Hodgkin difuso de células grandes B.
Disección traumática de la arteria carótida interna y embolismo cerebral en un jugador de fútbol. Reporte del primer caso.
Authors: Talledo Paredes Luisa , Rotta Rotta Aida , Dueñas Carbajal Roy , Medina Palomino Félix , Anchante Hernández Henry , Salazar Cáceres Pedro 
Published: March 2016

Reportamos el caso de un varón de 18 años quien sufrió contusión cervical por impacto con balón de fútbol. Tres días después fue hospitalizado con hemiplejia derecha directa y afasia de expresión. La resonancia magnética cerebral mostró lesión isquémica izquierda en ganglios basales. El doppler carotideo evidenció trombo desde el origen de la arteria carótida común izquierda extendida a la arteria carótida interna izquierda (CII) y la angiotomografía documentó disección de CII (lesión traumática carotídea tipo IV). Se optó por anticoagulación con warfarina y fisioterapia de rehabilitación; con evolución favorable. La incidencia de la injuria traumática carotídea es muy rara, más aún en futbolistas; el tratamiento es aún controversial, por lo que consideramos de interés el reporte de este caso.
Nonsurgical miniscrew-assisted rapid maxillary expansion results in acceptable stability in young adults
Authors: Choi Sung-Hwan , Shi Kyung-Keun , Cha Jung-Yul , Park Young-Chel , Lee Kee-Joon 
Published: March 2016

ABSTRACT

Objective:
To evaluate the stability of nonsurgical miniscrew-assisted rapid maxillary expansion (MARME) in young adults with a transverse maxillary deficiency.

Materials and Methods:
From a total of 69 adult patients who underwent MARME followed by orthodontic treatment with a straight-wire appliance, 20 patients (mean age, 20.9 ± 2.9 years) with follow-up records (mean, 30.2 ± 13.2 months) after debonding were selected. Posteroanterior cephalometric records and dental casts were obtained at the initial examination (T0), immediately after MARME removal (T1), immediately after debonding (T2), and at posttreatment follow-up (T3).

Results:
Suture separation was observed in 86.96% of subjects (60/69). An increase in the maxillary width (J-J; 1.92 mm) accounted for 43.34% of the total expansion with regard to the intermolar width (IMW) increase (4.43 mm; P &lt; .001) at T2. The amounts of J-J and IMW posttreatment changes were −0.07 mm (P &gt; .05) and −0.42 mm (P  =  .01), respectively, during retention. The postexpansion change in middle alveolus width increased with age (P &lt; .05). The postexpansion change of interpremolar width (IPMW) was positively correlated with the amount of IPMW expansion (P &lt; .05) but not with IMW. The changes of the clinical crown heights in the maxillary canines, first premolars, and first molars were not significant at each time point.

Conclusions:
Nonsurgical MARME can be a clinically acceptable and stable treatment modality for young adults with a transverse maxillary deficiency.
H∞
control of discrete-time linear systems constrained in state by equality constraints
Authors: Filasová Anna , Krokavec Dušan 
Published: March 2016

Abstract
In this paper, stabilizing problems in control design are addressed for linear discrete-time systems, reflecting equality constraints tying together some state variables. Based on an enhanced representation of the bounded real lemma for discretetime systems, the existence of a state feedback control for such conditioned stabilization is proven, and an LMI-based design procedure is provided. The control law gain computation method used circumvents generally an ill-conditioned singular design task. The principle, when compared with previously published results, indicates that the proposed method outperforms the existing approaches, guarantees feasibility, and improves the steady-state accuracy of the control. Furthermore, better performance is achieved with essentially reduced design effort. The approach is illustrated on simulation examples, where the validity of the proposed method is demonstrated using one state equality constraint.
Variable structure observer design for a class of uncertain systems with a time-varying delay
Authors: Liu Wen-Jeng 
Published: March 2016

Abstract
Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
Joint queue-perturbed and weakly coupled power control for wireless backbone networks
Authors: Olwal Thomas Otieno , Djouani Karim , Kogeda Okuthe P. , Wyk Barend Jacobus Van 
Published: March 2016

Abstract
Wireless Backbone Networks (WBNs) equipped with Multi-Radio Multi-Channel (MRMC) configurations do experience power control problems such as the inter-channel and co-channel interference, high energy consumption at multiple queues and unscalable network connectivity. Such network problems can be conveniently modelled using the theory of queue perturbation in the multiple queue systems and also as a weak coupling in a multiple channel wireless network. Consequently, this paper proposes a queue perturbation and weakly coupled based power control approach forWBNs. The ultimate objectives are to increase energy efficiency and the overall network capacity. In order to achieve this objective, a Markov chain model is first presented to describe the behaviour of the steady state probability distribution of the queue energy and buffer states. The singular perturbation parameter is approximated from the coefficients of the Taylor series expansion of the probability distribution. The impact of such queue perturbations on the transmission probability, given some transmission power values, is also analysed. Secondly, the inter-channel interference is modelled as a weakly coupled wireless system. Thirdly, Nash differential games are applied to derive optimal power control signals for each user subject to power constraints at each node. Finally, analytical models and numerical examples show the efficacy of the proposed model in solving power control problems in WBNs.
Influence of Melt-Mixing Process Conditions on Mechanical Performance of Organoclay/Fluoroelastomer Nanocomposites
Authors: Khajehpour M. , Sundararaj U. 
Published: March 2016

AbstractIn this study, Cloisite 20A, an organically modified Montmorillonite (Mnt), has been incorporated into Fluoroelastomer (FKM) through melt intercalation technique. Since the nanocomposite preparation method and conditions, and consequently, the resulting morphology play a critical role in the final properties, the effect of different process conditions such as time, temperature, and shear rate on the vulcanization, thermal and mechanical properties have been investigated. The morphology of nanocomposites, prepared at different melt-mixing conditions, was studied using X-ray diffraction (XRD). Rheological, thermal and mechanical behaviors were investigated by moving die rheometer (MDR), thermal gravimetric analysis (TGA), and tensile strength test respectively. Also, the crosslinking density has been measured for the nanocomposites. The best mechanical performance of clay/FKM nanocomposites was attained by optimization of the melt-mixing conditions. We achieved the following enhancements for FKM by clay incorporation: enhancement of tensile strength up to 70 %; elongation up to 94 %; and modulus up to 405 %. Process temperature was found to have a critical role in the final properties of the nanocomposites, while mixing residual time and shear rate had a moderate effect. The most desirable properties and curing behaviors, including highest maximum torques, cure rates, crosslinking densities, fast crosslinking kinetics, high intercalation and best improved tensile strengths, resulted with specific combination of melt-mixing parameters.
Dielectric Behavior of OPEFB Reinforced Polycaprolactone Composites at X-Band Frequency
Authors: Fahad A. , Abbas Z. , Obaiys S. J. , Ibrahim N. , Yakubu A. 
Published: March 2016

Abstract
Short fibres are often used as reinforcing materials with thermoplastic polymers to improve the dielectric properties of the composites. In this work, the effects of oil palm empty fruit bunch (OPEFB)-fibre loading on polycaprolactone (PCL) polymer were extensively studied. The synthesis of OPEFB-PCL composites were prepared via melt blend method. Theoretical and experimental analysis of electromagnetic (EMI) propagation, absorption and shielding effectiveness (SE) properties of the composite were also studied. The magnitudes of S-parameters for OPEFB fiber-reinforced PCL composites with different percentages of filler were measured by a rectangular waveguide connected with a microwave vector network analyzer (VNA) at (8 – 12) GHz frequency. Whilst the dielectric properties were studied using an open ended coaxial probe. The morphological characterization of the OPEFB-PCL composite was carried out using X-ray diffraction and scanning electron microscopy (SEM). This work showed that XRD profile patterns slightly changed duo to the filler loading increment which result a reduction in both dielectric constant and loss factor. However, the relative permittivity of pure oil palm fibre and PCL was measured as (1.8-j*0.08) and (2.929-j*0.3242) respectively. In addition, the composition of 12.5 wt% filler gave the highest dielectric constant and loss factor values. However, the reflection loss increases to filler content increments at the maximum frequency of 12 GHz. The excellent behavior of these polymer composites makes them superior nominees for microwave low absorption materials.
Numerical Simulation and Experimental Validation of Granite Powder Filled Jute Epoxy Composite for Slurry Jet Erosive Wear
Authors: Pawar M. J. , Patnaik A. , Nagar R. 
Published: March 2016

Abstract
In the polymer composite the benefits of utilizing the excellent wear resisting properties in terms of light weight structural design are immediately apparent. Hence, the focus of this study is to propose new sets of unfilled and particulate filled treated jute epoxy composites. Therefore, initially five different weight percentages of alkali treated jute epoxy composites are fabricated (10, 20, 30 40 and 50 wt.%) and studied their slurry erosive wear in experimentally at different operating conditions such as by varying impact velocity and impingement angle by keeping all other factors constant. The steady state erosion results for jute epoxy composites shows better wear resistant behavior for 40 wt.% jute fiber loading. Hence, for further fabrication of series of hybrid composite 40 wt.% jute fiber is kept constant and granite powder is varied in three different (8, 16 and 24 wt.%) weight percentages. The granite filler content in the jute epoxy composite played a major contribution for slurry erosion resistance. Finally, the obtained experimental results are compared with simulated model results by using a computational fluid dynamics tool. The eroded samples are observed through scanning electron microscope to study the wear mechanism.
THE INNER STRUCTURE OF DWARF-SIZED HALOS IN WARM AND COLD DARK MATTER COSMOLOGIES
Authors: González-Samaniego A. , Avila-Reese V. , Colín P. 
Published: March 2016

ABSTRACT
By means of N-body + hydrodynamic zoom-in simulations we study the evolution of the inner dark matter and stellar mass distributions of central dwarf galaxies formed in halos of virial masses M
v = (2–3) × 1010
h
−1
M
⊙ at z = 0, both in a warm dark matter (WDM) and cold dark matter (CDM) cosmology. The half-mode mass in the WDM power spectrum of our simulations is M
f = 2 × 1010
h
−1
M
⊙. In the dark matter (DM) only simulations halo density profiles are well described by the Navarro–Frenk–White parametric fit in both cosmologies, though the WDM halos have concentrations lower by factors of 1.5–2.0 than their CDM counterparts. In the hydrodynamic simulations, the effects of baryons significantly flatten the inner density, velocity dispersion, and pseudo phase space density profiles of the WDM halos but not of the CDM ones. The density slope, measured at ≈0.02R
v, α
0.02, becomes shallow in periods of 2–5 Gyr in the WDM runs. We explore whether this flattening process correlates with the global star formation (SF), M
s/M
v ratio, gas outflow, and internal specific angular momentum histories. We do not find any clear trends, but when α
0.02 is shallower than −0.5, M
s/M
v is always between 0.25% and 1%. We conclude that the main reason for the formation of the shallow core is the presence of strong gas mass fluctuations inside the inner halo, which are a consequence of the feedback driven by a very bursty and sustained SF history in shallow gravitational potentials. Our WDM halos, which assemble late and are less concentrated than the CDM ones, obey these conditions. There are also (rare) CDM systems with extended mass assembly histories that obey these conditions and form shallow cores. The dynamical heating and expansion processes behind the DM core flattening apply also to the stars in such a way that the stellar age and metallicity gradients of the dwarfs are softened, their stellar half-mass radii strongly grow with time, and their central surface densities decrease.
DUST MASSES OF DISKS AROUND 8 BROWN DWARFS AND VERY LOW-MASS STARS IN UPPER SCO OB1 AND OPHIUCHUS
Authors: van der Plas G. , Ménard F. , Ward-Duong K. , Bulger J. , Harvey P. M , Pinte C. , Patience J. , Hales A. , Casassus S. 
Published: March 2016

ABSTRACT
We present the results of ALMA band 7 observations of dust and CO gas in the disks around 7 objects with spectral types ranging between M5.5 and M7.5 in Upper Scorpius OB1, and one M3 star in Ophiuchus. We detect unresolved continuum emission in all but one source, and the 12CO J = 3 − 2 line in two sources. We constrain the dust and gas content of these systems using a grid of models calculated with the radiative transfer code MCFOST, and find disk dust masses between 0.1 and 1 M
⊕, suggesting that the stellar mass/disk mass correlation can be extrapolated for brown dwarfs (BDs) with masses as low as 0.05 M
⊙. The one disk in Upper Sco in which we detect CO emission, 2MASS J15555600, is also the disk with the warmest inner disk, as traced by its H–[4.5] photometric color. Using our radiative transfer grid, we extend the correlation between stellar luminosity and mass-averaged disk dust temperature, originally derived for stellar mass objects, to the BD regime to

, applicable to spectral types of M5 and later. This is slightly shallower than the relation for earlier spectral type objects and yields warmer low-mass disks. The two prescriptions cross at 0.27 L
⊙, corresponding to masses between 0.1 and 0.2 M
⊙ depending on age.
SOLAR ENERGETIC PARTICLE EVENT ONSETS: FAR BACKSIDE SOLAR SOURCES AND THE EAST–WEST HEMISPHERIC ASYMMETRY
Authors: Kahler S. W. 
Published: March 2016

ABSTRACT
Prompt onsets and short rise times to peak intensities Ip have been noted in a few solar energetic (E > 10 MeV) particle (SEP) events from far behind (≥25°) the west limb. We discuss 15 archival and recent examples of these prompt events, giving their source longitudes, onset and rise times, and associated coronal mass ejection (CME) speeds. Their timescales and CME speeds are not exceptional in comparison with a larger set of SEP events from behind the west limb. A further statistical comparison of observed timescales of SEP events from behind the west limb with events similarly poorly magnetically connected to the eastern hemisphere (EH) shows the longer timescales of the latter group. We interpret this result in terms of a difference between SEP production at parallel shocks on the eastern flanks of western backside events and at perpendicular shocks on the western flanks of EH events.
A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES
Authors: Braun D. C. 
Published: March 2016

ABSTRACT
We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, horizontal component of divergence, vertical component of vorticity, and a vertical kinetic helicity proxy, are mapped for each active region (AR) during its passage across the solar disk. Flow indices are derived representing the mean and standard deviation of these parameters over magnetic masks and compared with contemporary measures of flare X-ray flux. A correlation exists for several of the flow indices, especially those based on the speed and the standard deviation of all flow parameters. However, their correlation with X-ray flux is similar to that observed with the mean unsigned magnetic flux density over the same masks. The temporal variation of the flow indices are studied, and a superposed epoch analysis with respect to the occurrence to 70 M and X-class flares is made. While flows evolve with the passage of the ARs across the disk, no discernible precursors or other temporal changes specifically associated with flares are detected.
SEARCH FOR EXTREMELY METAL-POOR GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. HIGH ELECTRON TEMPERATURE OBJECTS
Authors: Almeida J. Sánchez , Pérez-Montero E. , Morales-Luis A. B. , Muñoz-Tuñón C. , García-Benito R. , Nuza S. E. , Kitaura F. S. 
Published: March 2016

ABSTRACT
Extremely metal-poor (XMP) galaxies are defined to have a gas-phase metallicity smaller than a tenth of the solar value (

). They are uncommon, chemically and possibly dynamically primitive, with physical conditions characteristic of earlier phases of the universe. We search for new XMPs in the Sloan Digital Sky Survey (SDSS) in a work that complements Paper I. This time, high electron temperature objects are selected; metals are a main coolant of the gas, so metal-poor objects contain high-temperature gas. Using the algorithm k-means, we classify 788,677 spectra to select 1281 galaxies that have particularly intense [O iii]λ4363 with respect to [O iii]λ5007, which is a proxy for high electron temperature. The metallicity of these candidates was computed using a hybrid technique consistent with the direct method, rendering 196 XMPs. A less restrictive noise constraint provides a larger set with 332 candidates. Both lists are provided in electronic format. The selected XMP sample has a mean stellar mass around

, with the dust mass

for typical star-forming regions. In agreement with previous findings, XMPs show a tendency to be tadpole-like or cometary. Their underlying stellar continuum corresponds to a fairly young stellar population (

), although young and aged stellar populations coexist at the low-metallicity starbursts. About 10% of the XMPs show large N/O. Based on their location in constrained cosmological numerical simulations, XMPs have a strong tendency to appear in voids and to avoid galaxy clusters. The puzzling 2%-solar low-metallicity threshold exhibited by XMPs remains.
ELECTROMAGNETIC COUNTERPARTS TO BLACK HOLE MERGERS DETECTED BY LIGO
Authors: Loeb Abraham 
Published: March 2016

ABSTRACT
Mergers of stellar-mass black holes (BHs), such as GW150914 observed by Laser Interferometer Gravitational Wave Observatory (LIGO), are not expected to have electromagnetic counterparts. However, the Fermi GBM detector identified a γ-ray transient 0.4 s after the gravitational wave (GW) signal GW150914 with consistent sky localization. I show that the two signals might be related if the BH binary detected by LIGO originated from two clumps in a dumbbell configuration that formed when the core of a rapidly rotating massive star collapsed. In that case, the BH binary merger was followed by a γ-ray burst (GRB) from a jet that originated in the accretion flow around the remnant BH. A future detection of a GRB afterglow could be used to determine the redshift and precise localization of the source. A population of standard GW sirens with GRB redshifts would provide a new approach for precise measurements of cosmological distances as a function of redshift.