bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling C540-C20 Fullerene Collisions
Authors: Rysaeva Leysan Kh. , Lobzenko Ivan P. , Baimova Julia A. , Dmitriev Sergey V. , Zhou Kun 
Published: April 2019

Abstract
Collisions of C20 and C540 fullerenes are studied in a wide range of velocities by means of classical molecular dynamics. The simulations show that the collision scenario strongly depends on the collision velocity of the fullerenes. At low collision energies, the fullerenes are repelled by the van der Waals forces, and after bouncing off a part of the kinetic energy of their translational motion is converted into the energy of cage vibrations. At higher collision energies, the fullerenes overcome the potential barrier of Pauli repulsion with the formation of the new chemical bonds, and a significant change in the geometry of the molecules is observed. At very high collision energies, structure of the molecules is destroyed with the formation of new carbon clusters. Analysis of collisions for fullerenes of significantly different size revealed some new features associated with their asymmetric energy exchange.
Synthesis, Structure and Mechanical Properties of Bulk “Copper-Graphene” Composites
Authors: Konakov V.G. , Kurapova O.Yu. , Solovyeva E.N. , Lomakin I.V. , Archakov I.Yu. 
Published: April 2019

Abstract
Bulk copper, copper-graphene and copper-graphite composites were produced from copper-thermally expanded graphite (TEG) powder mixtures with 0-3 wt.% TEG contents via modified powder metallurgy process that includes powder milling in a planetary mill at 350 rpm for 5 hours, compaction, and vacuum annealing at 1030 °C for 1 hour. Phase composition and microstructure of the composites were analysed by XRD and SEM techniques. According to Raman spectroscopy, TEG transforms into a few layer graphene flakes in case of composites with 0.1-1 wt.% of carbon additive, while for 3 wt.% of carbon additive it remains in the form of graphite. The addition of 0.1 wt.% TEG results in the tensile strength increase up to 160 MPa (from 93 MPa for pure copper specimen synthesized via the similar synthesis route). Vickers hardness obtained for Specimens under the study is independent fromthe composite composition.
Laser-Assisted Deposition of Transition Metal Coatings on Graphite
Authors: Rajput Deepak , Costa Lino , Lansford Kathleen , Murray George M. , Hofmeister WilliamH. 
Published: April 2019

Abstract
This paper reports the deposition of transition metal coatings on graphite by laser melting a pre-placed layer of powder particles using a continuous wave (CW) laser. Titanium, zirconium, and niobium coatings were successfully deposited on semiconductor grade graphite plates using the laser induced surface improvement (LISI) approach. The coatings produced were characterized using scanning electron microscope, energy dispersive spectrometry, X-ray diffraction, microhardness testing, and secondary ion mass spectrometry. Results show the formation of crack-free and dense transition metal coatings and the presence of carbide phases at the coating-graphite interface.
Effect of Carbon Sources and Synthesis Conditions on the LiFePo4/C Cathode Properties
Authors: Kapaev R.R. , Novikova S.A. , Chekannikov A.A. , Gryzlov D.Yu. , Kulova T.L. , Skundin A.M. , Yaroslavtsev A.B. 
Published: April 2019

Abstract
The sol-gel synthesis and precipitation from dimethyl sulfoxide (DMSO)-water mixture were used to obtain LiFePO4. Sucrose (sucr), citric acid (CA), phthalic acid (phth), polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyvinylidene fluoride (PVDF), polyethylene glycol (PEG), polyacrylic acid (PAA) were investigated as carbon precursors. Increasing of the annealing temperature from 600 °» to 800 °» leads to a certain perfection of graphite structure with simultaneous particle size growth. Higher capacities were observed for the materials synthesized at 600 °». The best results for the sol-gel synthesis were obtained when PVDF was used as a source of carbon coating due to the partial fluorination of LiFePO4 (discharge capacity of LiFePO4/ C-PVDF was ~160 and 70 mAh g-1 at 20 mA g-1 and 800 mA g-1 currents, respectively). For nanocrystalline LiFePO4 obtained by precipitation from DMSO-water mixture the best results were obtained when PEG was used as carbon source (discharge capacity LiFePO4/C-PEG was 158 and 77 mAh g-1 at 20 mA g-1 and 800 mA g-1, respectively).
Comparative Analysis of Dynamic Plasticity Models
Authors: Selyutina N.S. , Petrov Yu.V. 
Published: April 2019

Abstract
In the paper, a new phenomenological interpretation of some of the principal temporal effects of high-rate plastic deformation of metals from a united viewpoint is represented. A comparative analysis of some of the well-known dynamic plastic deformation models is given. Influence of strain rate on the stress-strain relation in a wide range of strain rates for different types of aluminum alloys and steels is described by the relaxation model of plasticity, by original and improved empirical Johnson-Cook models, and by the phenomenological Rusinek-Klepaczko model. It is shown that the structural-time model (“the relaxation model of plasticity”) is capable to effectively predict a wide spectrum of materials responses to fast and slow dynamic loading.
Ultrasonic Study of Thermal hysteresis in Helical antiferromagnetic Dy
Authors: Liubimova Iu. , Sapozhnikov K. , Nikolaev V. , Corró M.-Li , Kustov S. 
Published: April 2019

Abstract
High-resolution ultrasonic mechanical spectroscopy technique has been used to study the nature and dynamics of lattice defects and magnetic domain walls in the helical-type antiferromagnetic phase during thermal cycling of polycrystalline Dy samples between 80 and 210K. Effects of the lowest temperature of thermal cycles, applied magnetic field and cooling/ heating rate on the ultrasonic absorption and Young´s modulus have been investigated. A strong influence of cooling/heating rate on the ultrasonic absorption is found over the temperature range between the Néel temperature, ca. 178K, and approximately 145K, confirming the existence of a new category of magnetomechanical damping - transitory ultrasonic absorption related to translational motion of domain walls. A strong increase of the ultrasonic absorption below approximately 140K is attributed to the formation of nuclei of ferromagnetic phase, presumably stabilized by such lattice defects as dislocations. The effect of applied magnetic field on ultrasonic absorption also emerges below 140K and is ascribed to the appearance of the net magnetization due to ferromagnetic nuclei. We argue that these nuclei are responsible for the controversial thermal hysteresis of elastic and anelastic properties, which is strongly promoted by decreasing the temperature of thermal cycles.
On the Elastic Description of a Spherical Janus Particle
Authors: Kolesnikova A.L. , Gutkin M.Yu. , Krasnitckii S.A. , Smirnov A.M. , Dorogov M.V. , Serebryakova V.S. , Romanov A.E. , Aifantis E.C. 
Published: April 2019

Abstract
The elastic problem of a spherical core-shell particle with a truncated core is solved within the isotropic classical theory of elasticity. A transition to a Janus particle consisting of two unequal spherical segments with lattice mismatch is demonstrated. Elastic fields in the Janus particle are found and described in detail. The strain energy of the Janus particle in dependence on the interface coordinate is discussed.
Sensor Properties of Stabilized Zirconia Ceramics, Manufactured from Nanopowders
Authors: Kurapova O.Yu. , Pivovarov M.M. , Nikiforova K. V. , Konakov V.G. 
Published: April 2019

Abstract
The paper reports the data on the sensing properties of xCaO-(100-x)ZrO2 (CSZ, x=9, 12 and 15 mol.%) and 8Y2O3-92ZrO2 (YSZ) solid electrolytes, manufactured from nanosized lowagglomerated powder. Stabilized zirconia solid electrolytes (SE) were synthesized via the original co-precipitation technique and annealing at 1823K in air for 3 hours. Phase composition and conductivity of obtained ceramics was investigated via XRD and impedance spectroscopy techniques. Electromotive force (EMF) response on O2 partial pressure was obtained at 966K for sensors with stabilized zirconia membranes. The data obtained was compared with Nernst equation. The impact of the precursor powder synthesis technique on electrical and sensing properties was discussed.
Auger Recombination in Quantum Well Laser with Participation of Electrons in Waveguide Region
Authors: Karpova A.A. , Samosvat D.M. , Zegrya A.G. , Zegrya G.G. , Bugrov V.E. 
Published: April 2019

Abstract
A new mechanism of nonradiative recombination of nonequilibrium carriers in semiconductor quantum wells is suggested and discussed. For a studied Auger recombination process the energy of localized electron-hole pair is transferred to barrier carriers due to Coulomb interaction. The analysis of the rate and the coefficient of this process is carried out. It is shown, that there exists two processes of thresholdless and quasithreshold types, and thresholdless one is dominant. The coefficient of studied process is a non-monotonous function of quantum well width having maximum in region of narrow quantum wells. Comparison of this process with CHCC process shows that these two processes of nonradiative recombination are competing in narrow quantum wells, but prevail at different quantum well widths.
Effect of warm equal channel angular pressing on the structure and mechanical properties of Ti0.16Pd0.14Fe (wt%) alloy
Authors: Grishkov Victor , Kopylov Vladimir , Lotkov Alexander , Latushkina Svetlana , Baturin Anatoly , Girsova Natalia , Timkin Victor , Zhapova Dorzhima 
Published: April 2019

Abstract
Here we analyze the microstructure and phase composition of a Ti alloy with 0.16Pd and 0.14Fe (wt%) alloy exposed to warm equal channel angular pressing (ECAP) at 648 K. The analysis shows that after four ECAP passes, the material assumes a submicrocrystalline structure with an average grain size of 0.28 μm, as against its initial value 10 μm, and that the α phase dominates in the alloy both before and after ECAP. The initial alloy reveals a high content of Fe and Pd atoms near grain boundaries compared to central grain regions. Such near-boundary zones contain orthorhombic α′′ martensite in addition to the α phase, and β or α + β particles are found directly at the grain boundaries. These features of the phase composition are inherited after ECAP. The yield strength of the ECAP treated alloy is 500 MPa, being greater than the initial strength 350 MPa, and its margin of plasticity is rather high. The torsional strain up to fracture in the initial and in the ECAP treated alloy is 70% and 50%, respectively.
Alltägliche Praktiken zur Herstellung von Geschlechts-Körpern oder: Warum Unisex-Toiletten von Verfassungs wegen geboten sind
Authors: Lembke Ulrike 
Published: April 2019

ZusammenfassungGeschlechtersegregierte Toiletten sind Räume der interaktiven, symbolischen und zugleich alltäglichen, durch Einschreibung in die Körper höchst wirkmächtigen Herstellung hierarchischer Geschlechterverhältnisse. Soziologisch interessant sind die Verdichtung ineinandergreifender individueller, kollektiver und struktureller Prozesse der Konstitution von Geschlecht, welche verschiedene Geschlechtertheorien exemplarisch verdeutlichen können, sowie die in diesem Kontext wenig erforschten alltäglichen vor-reflexiven Praktiken der Bestätigung von Geschlechts-Körpern. Auch im Sprechen über die behauptete Notwendigkeit geschlechtersegregierter Toiletten wird die bipolare Heteronorm bzw. Heteronormativität beständig abgesichert, wie die Auswertung einer entsprechenden Forumsdiskussion zeigt. Die teils aggressive Behauptung gängiger Geschlechterstereotype, Naturalisierungsstrategien, ent-politisierende Intimitätsargumente und die strategische Bezugnahme auf geschlechtsspezifische Gewalt zur Absicherung männlicher Privilegien belegen einmal mehr, dass es hier nicht nur um die Rechte einer vielzitierten Minderheit geht, sondern um gesellschaftlich-strukturell bedeutsame Normen. In einem diesen Erkenntnissen entsprechenden, mehrdimensionalen Modell von Geschlechtsdiskriminierung, welches die externe wie die interne Dimension berücksichtigt, erweist sich die Geschlechtersegregation von Toiletten als Verletzung des Verbots der Geschlechtsdiskriminierung aus Artikel 3 Absatz 3 Grundgesetz und des Gebots der Gleichberechtigung aus Artikel 3 Absatz 2 Grundgesetz, welche nicht gerechtfertigt werden kann.
Effect of COL5A1, GDF5, and PPARA Genes on a Movement Screen and Neuromuscular Performance in Adolescent Team Sport Athletes
Authors: Stastny Petr , Lehnert Michal , De Ste Croix Mark , Petr Miroslav , Svoboda Zdenek , Maixnerova Eliska , Varekova Renata , Botek Michal , Petrek Martin , Kocourkova Lenka , Cięszczyk Pawel 
Published: April 2019

Abstract
Stastny, P, Lehnert, M, De Ste Croix, M, Petr, M, Svoboda, Z, Maixnerova, E, Varekova, R, Botek, M, Petrek, M, Lenka, K, and Cięszczyk, P. Effect of COL5A1, GDF5, and PPARA genes on a movement screen and neuromuscular performance in adolescent team sport athletes. J Strength Cond Res 33(8): 2057–2065, 2019—The risk of injury increases with adolescents' chronological age and may be related to limited muscle function neuromuscular, genetic, and biomechanical factors. The purpose of this study was to determine whether COL5A1, PPARA, and GDF5 genes are associated with muscle functions and stretch-shortening cycle performance in adolescent athletes. One hundred forty-six youth players (14.4 ± 0.2 years) from various team sports (basketball n = 54, soccer n = 50, handball n = 32) underwent a manual test for muscle function, maturity estimation, functional bend test (FBT), passive straight leg raise (SLR) test, leg stiffness test, test of reactive strength index (RSI), and gene sampling for COL5A1, PPARA, and GDF5. The χ2 test did not show any differences in allele or genotype frequency between participants before and after peak height velocity. Multivariate analysis of variance showed that COL5A1 rs12722 CT heterozygotes had worse score in FBT (p < 0.001), worse score in SLR (p = 0.003), and lower maturity offset (p = 0.029, only in females) than TT homozygotes. Male GDF5 rs143383 GG homozygotes showed better score in SLR than AA and AG genotypes (p = 0.003), and AA and AG genotypes in both sex had greater RSI than GG homozygotes (p = 0.016). The PPARA rs4253778 CC homozygotes had greater RSI than GG and GC genotypes (p = 0.004). The CT genotype in COL5A1 rs12722 is possible predictor of functional movement disruption in the posterior hip muscle chain, causing shortening in FBT and SLR, which includes hamstrings function. CT genotype in COL5A1 rs12722 should be involved in programs targeting hamstring and posterior hip muscle chain.
The Validity of a Global Navigation Satellite System for Quantifying Small-Area Team-Sport Movements
Authors: Delaney Jace A. , Wileman Taylor M. , Perry Nicholas J. , Thornton Heidi R. , Moresi Mark P. , Duthie Grant M. 
Published: April 2019

Abstract
Delaney, JA, Wileman, TM, Perry, NJ, Thornton, HR, Moresi, MP, and Duthie, GM. The validity of a global navigation satellite system for quantifying small-area team-sport movements. J Strength Cond Res 33(6): 1463–1466, 2019—The recent development of global navigation satellite systems (GNSS) has improved the availability and signal strength of surrounding satellites compared with traditional global positioning systems, although their ability to quantify rapid changes in speed may still be limited. This study aimed to evaluate the validity of GNSS to quantify the mean speed (m·s−1) and acceleration (m·s−2) of movements typical to team sports. One participant completed 9 periods of 4 minutes of activity, separated by 2-minute rest periods, which involved walking, jogging, and running in a variety of directions and patterns, aimed to simulate a team-sport movement profile. Speed and acceleration were quantified from a 10-Hz GNSS unit and compared with a 10-camera, 3-dimensional motion capture system (VICON), from which the movement of both the participant's center of mass (COM) and the location of the GNSS unit (e.g., C7 vertebrae) were calculated. Practical estimates of speed were associated with small differences from both the criterion COM (effect size; ±90% confidence limits = 0.19–0.25; ± ∼0.21) and criterion C7 (0.14–0.22; ± ∼0.13). The corresponding estimates of acceleration derived from raw data were classified as small (0.16–0.22; ± ∼0.15) and small to moderate (0.25–0.35; ± ∼0.24) for the COM and C7, respectively. Software-exported acceleration values exhibited very large mean bias compared with both criterion measures (−3.81 to −3.77; ± ∼0.24). This study demonstrates that 10-Hz GNSS possess acceptable validity for assessing the average demands of movements typical of team-sports training and competition, although caution is recommended when using software-exported measures of acceleration.
Fat-Free Mass Index in a Diverse Sample of Male Collegiate Athletes
Authors: Currier Brad S. , Harty Patrick S. , Zabriskie Hannah A. , Stecker Richard A. , Moon Jessica M. , Jagim Andrew R. , Kerksick Chad M. 
Published: April 2019

Abstract
Currier, BS, Harty, PS, Zabriskie, HA, Stecker, RA, Moon, JM, Jagim, AR, and Kerksick, CM. Fat-free mass index in a diverse sample of male collegiate athletes. J Strength Cond Res 33(6): 1474–1479, 2019—Fat-free mass index (FFMI) is a body composition metric that has been used to assess relative muscularity in athletes. Fat-free mass index is calculated by dividing FFM by height squared, although further height corrections through linear regression may be needed in taller individuals. This study reported height-adjusted FFMI (FFMIAdj) data in 209 male collegiate athletes from 10 sports (baseball, cross country, football, golf, ice hockey, weightlifting, rugby, swimming, track and field, and water polo) and the FFMIAdj natural upper limit for sports with sufficient sample size. The body composition of all subjects (mean ± SD; age: 20.7 ± 1.9 years, height: 182.9 ± 6.7 cm, body mass: 90.8 ± 16.8 kg, and percent body fat: 15.6 ± 5.3) was measured using dual-energy x-ray absorptiometry. Linear regression was used to adjust for height, and the FFMIAdj natural upper limit was determined by calculating the 97.5th percentile of all values. One-way analyses of variance with Games-Howell post hoc comparisons were used to determine between-sport differences. A paired-samples t-test revealed a significant difference (p < 0.001) between unadjusted and adjusted mean FFMI values. The overall mean FFMIAdj was 22.8 ± 2.8 kg·m−2. Significant between-sport differences (p < 0.001) in FFMIAdj were identified. Average FFMIAdj was highest in football athletes (24.28 ± 2.39 kg·m−2) and lowest in water polo athletes (20.68 ± 3.56 kg·m−2). The FFMIAdj upper limit was calculated for all athletes (28.32 kg·m−2), rugby (29.1 kg·m−2), and baseball (25.5 kg·m−2). This study reported FFMIAdj values in a diverse cohort of male collegiate athletes, providing data for the first time in several sports. These values can be used to guide nutritional and exercise interventions, predict athletic performance, and provide coaches with standardized information regarding the potential for further FFM accretion in male athletes.
A random decision for testing of the homogeneity of normal means against the tree order alternative
Authors: MOMENİ Reza , ETMİNAN Javad , KHANJARİ SADEGH Mohamad 
Published: April 2019

Consider the problem of testing the homogeneity of k + 1 normal means under the tree order restriction. In this paper, we propose new multiple comparisons procedures for testing of the tree order constraint. New test procedures with the corresponding simultaneous confidence intervals are motivated by some new estimation methods which are constructed based on a random decision and the Bayesian approach. Also, these procedures are developed for two-sided tree order alternatives. We compare the performance of the proposed methods with some existing test procedures, such as likelihood ratio test and some multiple comparisons tests for the tree order constraint. In some cases, the gains in power due to the proposed procedures can be substantial. The results for two sided alternative are similar to the one-sided hypotheses and two new procedures perform well for almost every configuration. We illustrate the efficiency of the proposed methods by analyzing of the two bioassay numerical examples.
Difficulties of diagnostics of acute myocardial infarction in elderly and senile patients and their influence on management in the acute period of disease
Authors: Tukish O. V. , Garganeeva A. A. 
Published: April 2019

Aim. To study the features of disease progress and approaches to the diagnostics of acute myocardial infarction (MI) among elderly and senile patients and their influence on the management in the acute period of disease.Materials and methods. The study was performed using the WHO program “Register of acute myocardial infarction” (Tomsk). The study included 410 patients (60 years and older), who had acute MI. The study group is represented by a comparable number of men (n=212) and women (n=198). The mean age of patients was 71 (66; 77) years (women are 5 years older than men (p<0,001)). Statistical processing was performed using the program Statistica V10.0.Results. Most of the patients had history comorbid pathology. In one in five patients (17,8%), the disease had an atypical manifestations, which in 41% of cases was represented by the asymptomatic form. Atypical manifestation of MI lengthened the prehospital phase of medical care due to a longer time before the first medical contact (p=0,005), as well as a late help-seeking (120 [49; 311,5] minutes). In 28% of patients, the level of creatine kinase-MB remained normal, and the indicator of troponin I exceeded the maximum values only in half of the cases. One fifth of the patients underwent acute MI treatment in non-core hospitals, which resulted in a low frequency of intervention (38%) and increasing by 2 times the chance of death within 5 years. The level of hospital mortality from acute MI in elderly patients in noncore hospitals was 3 times higher than in specialized departments (p<0,001).Conclusion. Difficulties in diagnostics of MI in patients of older age groups is caused by the prevalence of comorbid pathology, an atypical manifestations of the disease and low information content of biochemical markers of myocardial necrosis. It leads to an increase in time delays at the prehospital phase and frequent hospitalization of patients in non-core hospitals, making it impossible for them to receive timely, preferred therapy.