bluuebunny/crossref_metadata_2025_split huggingface dataset:
Therapy-Seeking Behavior among Parents Concerned about Their Adolescent's Substance Use
Authors: Kang Augustine W. , Escobar Katherine , Tavares Tonya , Helseth Sarah A. , Kelly Lourah M. , Becker Sara J. 
Published: June 2019

Background Among the most persistent public health problems in the United States is the gap between adolescents who need therapy for a substance use (SU) disorder and those who seek therapy. The role of parental factors (e.g., impressions of the adolescent's symptoms, sociodemographic factors) has been well documented in work examining adolescent help-seeking from professionals and paraprofessionals but has not been evaluated in studies of therapy-seeking for adolescents with SU. This study's primary objective was to identify parental sociodemographic and parent-reported clinical factors associated with therapy-seeking among parents concerned about their adolescent's SU. A secondary objective was to explore reasons why parents reported not seeking therapy and whether these reasons were associated with sociodemographic and clinical variables. Methods We conducted a survey of 411 parents of adolescents (age 12–19) who reported elevated concern about their adolescent's SU. Parents were asked whether their adolescent had a history of therapy, and those who reported no history were asked an open-ended question about reasons why they had not sought therapy. Responses were rated by 2 independent coders and used to sort parents into 3 groups: “treaters” (those who had sought therapy), “acknowledgers” (those who acknowledged their adolescent had SU problems but did not seek therapy), and “deniers” (those who denied their adolescent had SU problems). Multinomial logistic regression examined the relationship between sociodemographic and clinical factors and group membership. Results Multivariate analyses revealed that parent-reported SU severity, internalizing distress, and externalizing behavior problems were all associated with therapy-seeking behavior, with internationalizing distress emerging as the strongest predictor. Additionally, non-Hispanic white parents were more likely to seek therapy than minority parents. Conclusions Parent report of symptoms, especially internalizing distress, and parental race were associated with therapy-seeking behavior, highlighting opportunities for targeted outreach to engage parents in therapy.
Anti‐angiogenesis triggers exosomes release from endothelial cells to promote tumor vasculogenesis
Authors: Zeng Ye , Yao Xinghong , Liu Xiaoheng , He Xueling , Li Liang , Liu Xiaojing , Yan Zhiping , Wu Jiang , Fu Bingmei M. 
Published: June 2019

ABSTRACTAlthough anti‐angiogenic therapies (AATs) have some effects against multiple malignancies, they are limited by subsequent tumor vasculogenesis and progression. To investigate the mechanisms by which tumor vasculogenesis and progression following AATs, we transfected microRNA (miR)‐9 into human umbilical vein endothelial cells (HUVECs) to mimic the tumor‐associated endothelial cells in hepatocellular carcinoma and simulated the AATs in vitro and in vivo. We found that administration of the angiogenesis inhibitor vandetanib completely abolished miR‐9‐induced angiogenesis and promoted autophagy in HUVECs, but induced the release of vascular endothelial growth factor (VEGF)‐enriched exosomes. These VEGF‐enriched exosomes significantly promoted the formation of endothelial vessels and vasculogenic mimicry in hepatocellular carcinoma and its progression in mice. Anti‐autophagic therapy is proposed to improve the efficacy of AATs. However, similar effects by AATs were observed with the application of anti‐autophagy by 3‐methyladenine. Our results revealed that tumor vasculogenesis and progression after AATs and anti‐autophagic therapies were due to the cross‐talk between endothelial and tumor cells via VEGF‐enriched exosomes.
Interactions of Lump and Solitons to Generalized (2 + 1)-Dimensional Ito Systems*
Authors: Du Xuan , Lou Sen-Yue 
Published: June 2019

Abstract
The (2 + 1)-dimensional Ito equation is extended to a general form including some nonintegrable effects via introducing generalized bilinear operators. It is pointed out that the nonintegrable (2 + 1)-dimensional Ito equation contains lump solutions and interaction solutions between lump and stripe solitons. The result shows that the lump soliton will be swallowed or arisen by a stripe soliton in a fixed time. Furthermore, by the interaction between a lump and a paired resonant stripe soliton, the lump will be transformed to an instanton or a rogue wave.
Solution of the Dipoles in Noncommutative Space with Minimal Length*
Authors: Zhang Meng-Yao , Long Zheng-Wen , Long Chao-Yun 
Published: June 2019

Abstract
The single neutral spin-half particle with electric dipole moment and magnetic dipole moment moving in an external electromagnetic field is studied. The Aharonov-Casher effect and He-McKellar-Wilkens effect are emphatically discussed in noncommutative (NC) space with minimal length. The energy eigenvalues of the systems are obtained exactly in terms of the Jacobi polynomials. Additionally, a special case is discussed and the related energy spectra are plotted.
Analysis of the Possible

DD¯s0*(2317)

and

D*D¯s1*(2460)

Molecules with QCD Sum Rules*
Authors: Di Zun-Yan , Wang Zhi-Gang , Yu Guo-Liang 
Published: June 2019

Abstract

In this article, we assume that there exist the pseudoscalar

D

D
¯

s
0

*

(
2317
)

and

D
*

D
¯

s
1

*

(
2460
)

molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formula

μ
=

M

X
/
Y
/
Z

2

−

(
2

M
c

)

2

to determine the energy scales of the QCD spectral densities. The numerical results,

M

Z
1

=

4.61

−
0.08

+
0.11

GeV

and

M

Z
2

=

4.60

−
0.06

+
0.07

GeV

, which lie above the

D

D
¯

s
0

*

(
2317
)

and

D
*

D
¯

s
1

*

(
2460
)

thresholds respectively, indicate that the

D

D
¯

s
0

*

(
2317
)

and

D
*

D
¯

s
1

*

(
2460
)

are difficult to form bound state molecular states, the Z1,2 are probably resonance states.
Accretion onto Charged Black Holes in Einstein and Massive Theories of Gravity*
Authors: Jawad Abdul , Chaudhary Shahid 
Published: June 2019

Abstract

The accretion process is being investigated onto some important black holes such as Born-Infeld-AdS black hole, non-linear charged black hole solution in AdS space-time and Einstein-Yang-Mills massive gravity in the presence of Born-Infeld nonlinear electrodynamics. We find out the relations of radial velocity, energy density and change of mass for mention black holes and analyze their behavior graphically for different values of equation of state parameters ω. We also examine the relations for critical speed for these black holes. It is observed that for different state parameters different fluids exhibit different evolutions in black holes backgrounds. The energy density of some fluids is negative or positive near the black hole while other fluids become cause to increase or decrease in black hole mass.
Entropy Evolution in the Interior Volume of a Charged f(R) Black Hole*
Authors: Ali Shad , Wang Xin-Yang , Liu Wen-Biao 
Published: June 2019

Abstract

Based on the 4-dimensional black hole solution of f(R) theory coupled to a nonlinear Maxwell field, we calculate the interior volume of a charged f(R) black hole using the method proposed by Christodoulou and Rovelli. Considering massless scalar field in the interior volume and Hawking radiation carrying only energy, we calculate the entropy of the scalar field inside a charged f(R) black hole and investigate the evolution of the entropy under Hawking radiation. In the meantime, the evolution of the Bekenstein-Hawking entropy under Hawking radiation has also been calculated. Based on these results, the proportional relation is obtained between the evolution of the scalar field entropy and the evolution of Bekenstein-Hawking entropy under Hawking radiation. According to the result, we investigate and discuss how the modified coefficient b in f(R) gravity theory affects the evolution relation between the two types of entropy. It is shown that the radiation rate for Hawking radiation of a charged f(R) black hole can increase with the modified coefficient b.
Relativistic Self-Focusing of Hermite-cosine-Gaussian Laser Beam in Collisionless Plasma with Exponential Density Transition
Authors: Thakur Vishal , Ahmad Wani Manzoor , Kant Niti 
Published: June 2019

Abstract

This work reveals an exploration of self-focusing of Hermite-cosine-Gaussian laser beam in a collisionless plasma under relativistic nonlinearity. Self-focusing along with self-trapping of Hermite-cosine-Gaussian laser beam are analyzed for different values of laser intensity, plasma density, and decentered parameters. Mathematical analysis displays that these parameters play a major role in achieving the stronger and earlier self-focusing. Further, a comparative study between self-focusing of Hermite-cosine-Gaussian laser beam with and without exponential density ramp profile is introduced. Plasma density transition with exponential profile is found to be more effective in order to have stronger self-focusing. The present analysis may lead to very useful applications in the field of efficient harmonic generation, laser driven fusion etc.
Testing industrial laboratory dispersion method of Multi-Walled Carbon Nanotubes (MWCNTs) in aqueous medium
Authors: Rodriguez Carlos , Vélez Ederley , Restrepo Julián , Quintero Jorge H. , Acuña Rodrigo 
Published: June 2019

Abstract
The carbon nanotubes (CNTs) dispersion has gained interest in recent years due to its multiple applications in fields such as electronics, concrete, optics, environmental, automotive, marine and aeronautics coatings. In this sense it is necessary to develop stable dispersions of CNTs. On a laboratory scale the method of preparation of the CNTs is usually done using sonication, but this method is not appropriate to obtain CNTs dispersions on a larger scale. This work studies Multiwalled Carbon Nanotubes (MWCNTs) in aqueous medium comparing an industrial laboratory dispersion method vs traditional sonication. A factorial experimental design was performed, considering as variables: dispersion method, type of surfactant and use of a rheological modifier. The samples were prepared according to the full factorial DoE and properties such as electrical conductivity and pH were studied. Stability measurements were carried out over time and charge stability studies were performed using zeta potential measurements. The results shown the best combination of variables for the electrical conductivity was: dispersion method, sonication; dispersant, TX-100; rheological modifier, present. Although the results show that an improvement in CNTs dispersion is not achieved with the grinding and the use of industrial additives, the additive Disperbyk 2012 presented the highest value of electrical conductivity as a lonely compound, but the final electrical conductivity obtained when using it was not so high, it indicates that this additive must have specific conditions of activation, which implies that a further experimental work is required in order to get a suitable working window that allows a combination of variables with greater industrial application.
Parameters optimization in the casting processes of Fe32Cu64B4 magnetic alloys
Authors: Garzón D. , Arnache O. , Aristizabal R. , Santacruz Andrés , Ostos C. , Echavarría Alejandro 
Published: June 2019

Abstract
A Fe32Cu64B4 (FeCuB) alloy was obtained by using an induction furnace under an argon atmosphere. Parameters suitable in the casting processes like voltage, temperature and cooling times were optimized. Once the FeCuB alloy was melted and solidified, X-ray diffraction (XRD) and surface morphology analysis were performed through optical and scanning electron microscopy (SEM-EDX). The results showed that complete diffusion of the precursor elements (Fe, Fe2B, Cu) requires thermal homogenization treatments (2 and 4 hours) at 750° as suggested from phase diagram of FeCuB simulation. The XRD analysis revealed that the primary crystallization consists of a mixture of the fcc-FeCuB (79%) and bcc-FeCuB (21%), with a = 3.62Å, spatial group Fm-3m and a = 2.86Å, spatial group Im-3m respectively. Micrographic images show an average grain distribution of ∼ 135µm. Finally, long times of homogenization (4 hours) allow a greater uniformity and redistribution of grain boundaries, resulting in the formation of an equiaxed grain structure in the alloy.
Synthesis of Bi0.4Sr0.6FeO3-δ (BSF) powders and ceramics
Authors: Reales Rios M , Medina Barreto M H , Cruz Muñoz B 
Published: June 2019

Abstract
By mean of mechanical alloying the synthesis of Bi
0.4
Sr
0.6
FeO
3–δ ceramic powders were achieved according to the stoichiometric relations of Bi
2
O
3, Fe
2
O
3 and SrCO
3 initial powders. Then thermal treatments in air both 800 °C as 825 °C as at function on time was carried out on the processed ceramic powders, which were posteriorly characterized via X-ray diffraction and thermogravimetric. Finally, uniaxial compaction of the chosen processed powders to 800 °C was performed adding polyvinyl alcohol (PVA) or butyral alcohol (PVB) try to find a higher porosity. The milled ceramic compound presented a single cubic phase with lattice parameters of 3.95Ȧ when it was thermally treated at 800 °C and only 30 min of thermal treatment. No change on lattice parameter was found with higher treatment time. Thermogravimetric analysis showed processed powder are stable to work at the operation temperature of the solid oxide fuel cell chosen. In regard to porosity, the results showed that an adequate porosity 27 % with addition of PVB was achieved.
Grain Size Reduction Effect on Structural and Magnetic Properties in La1-xSrxMnO3 (x = 0.3 y 0.4) by Mechanical Ball Milling
Authors: Campillo G , Osorio J , Arnache O , Gil A , Beltrán J J , Dorkis L 
Published: June 2019

Abstract
We have investigated the magnetic, structural and morphological properties of ferromagnetic phases of manganite La1-xSrxMnO3 with x = 0.3 (LSMO-30) and x = 0.4 (LSMO-40) prepared by solid state reaction method, and then subjected to mechanical ball milling at different times of 3, 6 and 12 h. All of the samples were characterized by X-ray diffraction (XRD) and magnetic measurements. From Rietveld analysis of XRD patterns it was found a reduction in crystallite average size (Dv) with increasing milling time, for both concentrations. For LSMO-30 sample a mix of two different crystallographic structures, an orthorhombic phase (Pnma), and another rhombohedral (R3C) were identified at 3 and 6 h, but for 12 h of milling the R3C structure was the only phase identified. In contrast, for LSMO-40 the R3C structure was discerned as the unique phase independent of milling time. For both samples, a low value of the saturation magnetization was obtained for the longer milling time (smaller Dv). This behaviour was attributed to surface effects that induce magnetically disordered states with decreasing of particle size. This magnetic anisotropy surface was also evidenced on Zeta potential values and the changes of coercive fields, which increased most drastically with the first hours of mechanical ball milling time.
Implementation of a portable EDXRF measurement chain for characterization of metallic objects of cultural interest in Colombia
Authors: Julio Fabián S. , Felipe Ramírez Luis , Pimienta Hernán , Osorio Jaime , Oscar Arnache O. 
Published: June 2019

Abstract
The study of cultural heritage requires sophisticated equipment that does not alter or destroys the materials composing the objects under study. The main requirement about an artifact or an ancient work of art, for its restoration or conservation processes, is information about its constituting elements. Energy-dispersive X-ray fluorescence (EDXRF) is a very versatile and relatively inexpensive technique for conducting a nondestructive elemental analysis. In this paper, we present the design and implementation of a hand-hold X-ray fluorescence spectrometer. Although the EDXRF measurement chain appears to be a simple technique to assemble and use, it requires extensive knowledge about the proper handling of the X-ray beam, the analysis of the spectrum and whether the obtained spectrum is appropriate for a qualitative and quantitative analysis. Even geometry is one of the most important factors since the source-sample-detector distances must be handled with meticulousness to obtain optimal spectra. Acquisition time and the amount of accumulated counts to obtain high resolution spectral peaks are very important as well.
This work shows the results obtained from metallic samples of Colombian cultural interest belonging to the collection of Museo Universitario Universidad de Antioquia.
Design and Construction of a Muon Detector Prototype for Study the Galeras Volcano Internal Structure
Authors: Guerrero I.D. , Cabrera D.F. , Paz J.C. , Estrada J.D. , Villota C.A. , Velasco E.A. , Fajardo F.E. , Rodriguez O. , Rodriguez J. , Arturo D. , Dueñas D. , Torres D. , Ramirez J. , Revelo J. , Ortega G. , Benavides D. , Betancourt J. , Tapia A. , Martinez-Caicedo D.A. 
Published: June 2019

Abstract
Muon tomography is a technique based on the observation of the absorption of muons in matter, as the ordinary radiography does using X-rays. The interaction of cosmic rays with the atmosphere produce Extensive Air Showers, which provide an abundant source of muons. These particles can be used for multiple applications on muon tomography, in particular, to study the internal structure of different volcanoes edifices. It is necessary in any muon tomography experiment a particle detector that has the capability to be sensitive to muon interactions. Here we report a brief description of the first steps towards a complete design of a prototype particle detector to perform muon tomography in harsh conditions encountered in the surroundings of the Galeras Volcano. The mechanical design and fabrication processes of the supporting structure of the muon detector prototype, and first steps towards a future detector simulations on GEANT4 are described in this work.
Carbonation study in a cement matrix with carbon nanotubes
Authors: Rodriguez B. , Correa E. , Arias Y. P. , Quintero J.H. , Calderón J.A. , Mendoza O. A. 
Published: June 2019

Abstract
Carbon nanotubes as additions in Portland cement based matrices have a great potential to improve the mechanical properties of mortars and concretes; however, little work has been done regarding the effect that they have on the chemical durability of the cement matrix and reinforcing steel. In this work, carbon nanotubes are dispersed in water solution with Triton X 100 surfactant and blended in Portland cement mortars. A sharp decrease in compression resistance was observed at all curing ages (7, 14, 21 and 28 days) while a depth increase in the carbonation profile was found, which is associated with a decrease in the matrix durability.
Correlation between cross sectional area and torsion degree of fique yarns by image analysis system
Authors: Díaz-Ramírez G A , Sanchez H G , Cruz R A 
Published: June 2019

Abstract
The improvement of the natural fibers which are used in composite materials engineering applications depends on the reliable estimation of their mechanical properties, whose calculation is directly associated with the determination of their physical characteristics, such as cross-sectional area and diameter. The cross-sectional area of fique yarns, a natural fiber obtained from “furcraea andina” plant, consists in the sum of several singular fiber areas packaged thanks to the torsion effect of the spinning process. In this study, cross-sectional areas of fique yarns were obtained by optical micrographs, afterwards, the images were processed by two different approaches: the first one using Fiji, a specialized software for image processing; and the second one, through an own Matlab programming. The results obtained by both methods were compared and the respective diameter values for each fiber were extracted, assuming a circular shape of fique fibers cross-section. To perform the microscopic shots, fique yarns (0,877 and 0,714 tex) with torsion degrees of 1.5, 2.0 and 2.5 turns/inch were selected. The results indicated that even though linear density remain constant, the cross-sectional area varies with torsion degree. Additionally, the image analysis method allowed to improve the accuracy of calculations. It is expected that the measurement method proposed contributes to improving mechanical analysis of these type of materials in future studies.
Optical microresonator in form of hollow bottle for the measurement of hydrostatic pressure: A theoretical study of its sensitivity
Authors: Amador J , Avila D A , Horta S D 
Published: June 2019

Abstract
In this research, we report the theoretical study of an optical microresonator in form of hollow bottle for the measurement of hydrostatic pressure in microfluidics. The proposed device bases its operating principle on the excitation of the resonant modes WGMs that are confined to the interior of the optical cavity through the evanescent coupling of the light from the outside. The analytical study developed to determine the sensitivity of the device to changes in internal pressure in the hollow micro-bottle, is developed from a layer model with application of boundary conditions in the problem, where it is necessary to consider the excitation of the transverse modes WGMs and the elastic-optical effect produced by the internal pressurization of the resonant cavity. In the investigation we have concluded that the theoretical results present a good approximation with the experimental results using the layer model with which it is possible to optimize the design of this type of devices to improve the sensitivity for the measurement of the hydrostatic pressure in microfluidics.
Acoustic properties of concrete modified with an asphalt/styrene butadiene emulsion
Authors: Cruz R A , Correa C R , Díaz-Ramírez G A 
Published: June 2019

Abstract
This work describes the acoustic properties, such as absorption and reflection acoustic coefficients and noise reduction coefficient (NRC), and the mechanical strengthening of a modified asphaltic emulsion concrete. The asphalt emulsion has emulsifying agents, water and 62% asphalt, and has been mixed with styrene butadiene (SB) to 5% in asphalt weight. The concrete was made with high strength cement. Additionally, the concrete was modified with the SB emulsion at 5, 15 and 20% (CM5, CM15, CM20) of the cement weight. The results showed different coefficients depending on the wave frequency. CM20 shows the higher absorption coefficient. On lower frequencies, the concrete pattern (CP) and CM5 have higher reflection coefficients. CM20 indicated one hundred percent increase on the NRC related to CP. Al the same time, the compressive strength decreases proportionally to the amount of emulsion between 13 and 43% compared to the concrete pattern.