bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dielectric study of syntactic foams based on polydimethylsiloxane and hollow glass microspheres at X-band microwave frequency
Authors: Mastalygina E E , Chukhlanov V Yu 
Published: August 2020

Abstract
The dielectric characteristics of syntactic foams based on polydimethylsiloxane binder and hollow glass microspheres at the X-band microwave frequency were studied. Experimental studies were carried out to determine and calculate dielectric constant, dielectric loss tangent in the range from 8 to 12 GHz, as well as radio transparency of the obtained materials. According to the results, an increase in the binder content over 15-20 vol.% led to a significant loss of radio transparency. The treatment by hydrophobizing organosilicon liquid was shown as an effective method for decreasing the dielectric loss tangent and increasing the radio transparency at the microwave radio frequency range. The developed materials proved the temperature stability and fire resistance. The expected applications of syntactic foams based on the developed materials include the various fields of structural and industrial engineering, in particular, producing the protective constructions for stationary radar stations and radio telescopes.
Method for determination of thermophysical properties of polymer composite materials
Authors: Sharshin Vladimir , Sukhorukov Denis , Sukhorukova Elena 
Published: August 2020

Abstract
The paper presents the results of studies of thermophysical properties: heat capacity, thermal conductivity, thermal diffusivity and heat storage ability of polymeric polymer composite materials. A method is proposed for determining these properties, based on the well-known method for determining thermophysical properties by eliminating variables. The experimental values of the thermophysical properties of polymer composite materials with the addition of powder particles of various fractions of aluminium, iron, carbon and copper are obtained. The effectiveness of the proposed method is shown by comparing the known values of the specific heat and thermal conductivity of polyurethane with experimental.
Cyclic strength of polyester acrylate composites
Authors: Erofeev Vladimir , Fomin Nikolay , Ivlev Viktor , Yudin Vyacheslav , Myshkin Anton 
Published: August 2020

Abstract
The results of a study of the cyclic strength of polyester-racrylate composites are presented. The mechanical properties of the samples were determined on a Shimadzu Autograph AG-X Series universal testing machine. Test process management and pre-processing of data obtained on this machine are performed using the TRAPEZIUM X * 1 software. The measurements were carried out with a constant velocity of movement of the active capture of 3 mm / min. The compression force was directed along the long axis of the sample. The cyclic mechanical impact on the sample was carried out according to the following scheme: “loading to a certain maximum stress σmax in a given cycle → complete unloading at the same speed → five times repeating the cycle with a given load σmax → repeating the five times cycling procedure with a stepwise change in maximum load σmax until the sample is destroyed. It is shown that a characteristic feature of the load – strain curves during cycling is the presence of hysteresis, which is especially significant in the first cycle. The first compressive loading of the sample leads to significant changes in the structure of PEA. In the second and subsequent cycles, the difference between the loading and unloading curves of the sample is noticeably smaller and depends little on the cycle number. Then the state of the sample is stabilized, and subsequent cycling affects it much weaker. It is characteristic that the maximum difference between the losses in the first and subsequent cycles is observed at the minimum initial voltage. At maximum loads, the unloading curve is steeper than the loading curve, and at low loads, vice versa. Hysteresis losses increase with increasing maximum load in the cycle, which corresponds to an increase in the contribution of the plastic component to the total deformation of the sample. The E (σ) dependences obtained during loading in the first cycle practically coincide with the loss curves. In subsequent cycles, a slight quantitative change in these curves is observed without changing their general nature. The dependences obtained by unloading the samples are fundamentally different from the dependences obtained by loading. In this case, the discrepancy between the E (σ) curves during loading and unloading in the composite is slightly weaker than in pure PEA.
Creep and relaxation of polyester acrylate composites
Authors: Erofeev Vladimir , Fomin Nikolay , Ivlev Viktor , Yudin Vyacheslav , Myshkin Anton 
Published: August 2020

Abstract
It is shown that creep and relaxation are the most important properties for structural materials. This research presents the results of a study of filled polyester acrylate composites’ creep and relaxation. The comparison of mechanical indicators with similar for unfilled materials is shown in this work. Investigation of mechanical properties of the samples was carried out on a universal testing machine Shimadzu Autograph AG-X Series at room temperature. It was revealed that the intensity of stress and creep relaxation in the composite is much weaker than in pure resin. It was found that composites are characterized by a logarithmic time dependence of stress relaxation and creep. Logarithmic dependences for the studied parameters are of the same nature. Changes in indicators are mainly due to the properties of the binder.
Dynamic dampers of vibrations of inherited-deformable systems with finite number of degrees of freedom
Authors: Abdullaev Zafar , Yusupov Majid , Mirzaev Sayibdjan , Noraliev Nurilla , Kusharov Zohid 
Published: August 2020

Abstract
The problem of dynamic vibration dampers of inherited-deformable systems with finite number of degrees of freedom is considered. Rheological properties of spring (suspension) are taken into account using integral model with Koltunov-Rzhanitsin relaxation core. The behavior of the system with a damper is considered at free attenuation oscillations caused by the specified initial conditions, as well as at constant, pulse and periodic external impacts. The obtained results make it possible to conclude on the expediency of using dynamic dampers to reduce amplitude of oscillations, both in perfectly elastic and in inherited-deformable systems during transient processes. A computational algorithm based on quadrature formulas is used to solve the problem.
Vertical nonlinear oscillations of viscoelastic systems with multiple degrees of freedom
Authors: Karimova Khabiba , Khikmatullaev Sanjar , Kholiyorov Umirzok , Mirjalalov Nuriddin , Islomov Utkir , Juraeva Fotima 
Published: August 2020

Abstract
Vertical oscillations of three loads of different masses connected by nonlinear viscoelastic springs (suspensions) are considered in the paper. An account for rheological properties of the suspension, an integral model with the Koltunov-Rzhanitsyn relaxation kernel is used. Effective computational algorithms have been developed for solving problems based on the use of quadrature formulas. The effect of rheological properties of suspension on the mass displacement from the position of static equilibrium is investigated as well as the influence of nonlinear properties of the suspension on the mode of vibration and frequency.
Energy-saving solutions in the construction and housing and utilities sectors of Russia
Authors: Melnikov Vladimir , Dorofeev Viktor , Gavrilov Michail , Medvedev Maxim 
Published: August 2020

Abstract
As an object of research, the direction of optimizing energy saving and increasing energy efficiency of multi-layer enclosing structures (in particular, external walls) of buildings (with insulation and ventilated facades) was adopted. The high relevance of the research is related to the achievement of rational use (to an optimal level) of material and energy resources (with the correct choice of properties and location of the insulation in the wall). The accepted research method is based on the application of thermal engineering calculation of the external fence and its temperature field, other elements of the building heating system with the establishment of dependencies between the values and comparing them with the standard performance indicators (using the Mathcad program). Specific results of the study include determining the temperature distribution in the thickness of the 5-layer outer wall with fixing the plane with zero temperature of the material, which shows the place of possible freezing in the structure.
Fractal model of “breakthrough” innovation in nanotechnology
Authors: Bukharov D N , Arakelian S M 
Published: August 2020

Abstract
The fractal modeling approach is applied to the distribution process of breakthrough innovation in nanotechnology. For modeling, a diffusion-limited aggregation fractal is used. This model takes into account the change in the probability of adhesion (the ability to perceive innovations) and viscosity (the rate of propagation of innovations). Evaluation of the fractal dimension of the simulated structures allows us to identify trends and predict their further development. The model system reaches a breakthrough jump with a fractal dimension greater than 1.6. The unstable nature of the further development of the system will be observed with a sharp increase in fractal dimension, if the parameters of the ability to perceive innovations and the speed of innovation spread to level 1. Favorable conditions for the technological leap are realized in the case with a slightly lower fractal dimension when the rate of innovation spread is 1. The stable nature of the development of the system is observed at medium rates and above. With general trends below the average, the leap will be difficult to achieve.
The effect of laser cladding modes on the geometrical parameters and adhesion strength of the deposited layer on a steel substrate 08Kh18N10T of corrosion-resistant powder 08Kh17N8S6G
Authors: Gotz A N , Gusev D S , Guskov V F , Zavitkov A V , Lukhter A B , Prokoshev V G , Rumyantcev I V 
Published: August 2020

Abstract
The results of testing samples of steel 08Kh18N10T with deposited tracks and layers of corrosion-resistant powder 08Kh17N8S6G at various laser cladding modes for the development of coating technology for working surfaces of shut-off valves on nuclear and thermal power plants. Laser cladding the steel substrate was carried out on a robotic cladding complex with an ytterbium fiber laser and coaxial powder feed. Laser output, processing speed, mass flow rate and track overlap were variable parameters for evaluating the quality of laser cladding. Macrogeometry was performed on transverse sections, adhesion tests were carried out on special samples using a testing machine. The absence of pores, cracks, undercut by visual inspection and cross section samples, the adhesion strength of the layer to the substrate, penetration depth and clad height are used as quality of coating. Identified cladding parameters having an effect on increasing the clad height, the penetration depth, as a result, the adhesion strength are revealed. Laser cladding modes are selected that provide a deposited layer with a height of more than 1 mm and good adhesive properties.
Effect of part orientation on temperature stresses in the structure of a material during selective laser melting
Authors: Voznesenskaya A A , Kochuev D A , Raznoschikov A S , Zhdanov A V , Morozov V V 
Published: August 2020

AbstractIn this paper, we consider the problems of thermal stress during selective laser melting. Using scanning electron microscopy, the average particle size and shape of the AlSi10Mg powder alloy were revealed. Details of complex geometric shapes have been grown by various construction strategies using the selective laser melting method. In the first case, the influence of supporting structures on the geometric shape of the part was considered. An optimal set of supporting structures has been developed in order to reduce the time spent on machining after selective laser melting, as well as to exclude supports in hard-to-reach cavities. In the second case, the location of the part on the construction platform was considered. It was found that changing the orientation of the parts allows to reduce the volume and number of supporting structures. The results are obtained on thermal stresses occurring in the process of growing a part by selective laser melting.
Design of spaser-like nanoparticle systems for nonclassical optical states generation
Authors: Gubin M Yu , Shesterikov A V , Prokhorov A V 
Published: August 2020

Abstract
The quantum features of photon generation in multiparticle spaser systems consisting of metal nanoparticles and semiconductor quantum dots are investigated. We found the conditions for stationary regime of single-photon generation in spaser systems. In particular, in order to achieve a balance between gain and loss in the system, we determined the chemical and geometric characteristics of nanoparticles and quantum dots by using the optimization algorithm. The strong dipole-dipole interaction between nanoparticles in the spaser system is studied. We show that these conditions can lead to the violation of Cauchy-Schwartz inequality and appearance of nonclassical correlations in the system. The generation of entangled photons in a three-particle spaser system with nonlinear plasmon-exciton interaction is theoretically demonstrated. The introduction of an additional degree of freedom in the form of an external magnetic field leads to a change in the energy levels of quantum dots and provides the possibility to control the quantum properties of generated photons. We proposed the model of an effective subwavelength source of entangled photons controlled by an external magnetic field.
Influence of thermal ageing on creep rupture mechanism and creep life of P92 ferritic steel
Authors: Kang Hui , Shen Junjie , Zhang Shanjun , Han Hongguang , Hu Fuyong , He Biao , Zhao Qingquan , Xiao Gongye 
Published: August 2020

Abstract
In order to analyze the effect of thermal ageing on creep rupture mechanism and establish a method for predicting the creep rupture life of P92 heat-resistant steel under thermal ageing, creep tests were performed on P92 steel specimens, aged at 650 °C for different times under different applied stresses. Optical microscopy and scanning electron microscopy were utilized to observe the microstructure after thermal ageing and creep rupture. Voids and cracks were distributed in the grains of P92 steel before thermal ageing, whereas the voids were clearly distributed around M23C6 precipitates and Laves phase along sub-grain boundaries after thermal ageing. The creep damage tolerance factor of the unaged and short-time aged samples ranged from 2.5 to 5, and the creep rupture was caused by dislocation movement. After high-temperature thermal ageing for 3000 h, the damage tolerance factor increased to > 5 and creep rupture was caused by precipitate coarsening. A theoretical method was established to predict the creep rupture life of heat-resistant P92 steel under thermal ageing, providing consistent results with the American Society of Mechanical Engineers (ASME) long-term test and trend.
Little Voices: The Importance and Limitations of Children’s Histories
Authors: Chapdelaine Robin P. 
Published: August 2020

Abstract
In a complement to the 2020 AHR Roundtable “Chronological Age: A Useful Category of Historical Analysis” (125, no. 2), this AHR Exchange focuses on the history of children and childhood. Sarah Maza presents a critical review essay, highlighting the limiting factors in the expanding field of childhood studies. Children, she observes, produce few sources of their own voices, have limited agency, and as individuals and as a group soon outgrow their subaltern status—they grow up. Robin P. Chapdelaine, Nara Milanich, Steven Mintz, Ishita Pande, and Bengt Sandin—historians representing diverse geographical, theoretical, and methodological perspectives on the history of children and childhood—react to Maza’s observations by bringing up important methodological questions about subjecthood, agency, and modernity. Maza’s rejoinder reflects on these questions and on the possibility of age-based historical agency.
First- and Second-Trimester Reference Intervals for Thyroid Function Testing in a US Population
Authors: Bunch Dustin R , Firmender Kyle , Harb Roa , El-Khoury Joe M 
Published: August 2020

Abstract

Objectives
Thyroid dysfunction in pregnancy is associated with increased risk of adverse outcomes to mother and child. Trimester-specific reference intervals for thyroid function tests are not routinely provided by clinical laboratories. In this study, we present first- and second-trimester-specific reference intervals in a US population for thyroid-stimulating hormone (TSH), free thyroxine (FT4), total thyroxine (T4), and total triiodothyronine (T3) measured on Roche analyzers.

Methods
We used patient samples from first- and second-trimester prenatal screening. Samples were limited to singleton pregnancies and negative screening results for thyroid peroxidase and thyroglobulin antibodies. Analytes (TSH, FT4, T4, and T3) were measured on a Roche Modular e170 then verified on a Roche cobas e801.

Results
The reference intervals established on the e170 and verified on the e801 for the first trimester were 0.16 to 2.82 mIU/L for TSH, 12.0 to 18.5 pmol/L for FT4, 62.8 to 177.9 nmol/L for T4, and 1.5 to 3.4 nmol/L for T3. The reference intervals for the second trimester were 0.40 to 3.62 mIU/L for TSH, 10.2 to 16.6 pmol/L for FT4, 66.6 to 176.0 nmol/L for T4, and 1.56 to 3.6 nmol/L for T3.

Conclusions
This is the first report of trimester-specific reference intervals for thyroid function tests on Roche analyzers in the United States, and it is consistent with worldwide reports.
Medicare Trends in Pathologist Participation, Service Utilization, and Payments
Authors: Arvisais-Anhalt Simone , Araj Ellen , Park Jason Y 
Published: August 2020

Abstract

Objectives
Quantifying pathologist participation in Medicare services may be informative for the prediction of future workforce needs and reimbursement.

Methods
A retrospective examination was performed of pathologist professional (Part B) Medicare billings and payments from 2012 to 2017. The Medicare Provider Utilization and Payment Data: Physician and Other Supplier Public Use File was the primary data source.

Results
From 2012 to 2017, there was an increase (3.7%; 11,215 up to 11,627) in pathologists providing Medicare Part B services. Female pathologists increased from 36.10% to 40.8% of pathologists during this time period. Normalized per pathologist, there was an increase (7.8%; 1,382 up to 1,489) in beneficiaries served as well as an increase (4.1%; 2,442 up to 2,543) in services performed. The top 10 pathology Part B services performed in a facility were all surgical pathology. Although services increased, the overall payment of Part B pathology services decreased (3%; $996,519,358 down to $966,615,856) during the study period.

Conclusions
Although there is increasing pathologist participation in Medicare, the workload per pathologist has increased.
Associations of Height With the Risks of Colorectal and Endometrial Cancer in Persons With Lynch Syndrome
Authors: Brouwer Jesca G M , Newcomb Polly A , Bisseling Tanya M , Figueiredo Jane C , Hopper John L , Jenkins Mark A , Koornstra Jan J , Lindor Noralane M , Vasen Hans F A , Win Aung K , Kampman Ellen , van Duijnhoven Fränzel J B 
Published: August 2020

Abstract
People with Lynch syndrome (LS), who carry a pathogenic mutation in a DNA mismatch repair gene, have increased risks of colorectal cancer (CRC) and endometrial cancer (EC). A high reported variability in cancer risk suggests the existence of factors that modify cancer risk for persons with LS. We aimed to investigate the associations between height and CRC and EC risk for persons with LS using data from 2 large studies. Information on 1,115 men and 1,553 women with LS from the Colon Cancer Family Registry (1998–2007) and the GEOLynch Cohort Study (2006–2017) was harmonized. We used weighted Cox proportional hazards regression models with age on the time axis to estimate adjusted hazard ratios and 95% confidence intervals for each 5-cm increment in self-reported height. CRC was diagnosed in 947 persons during 65,369 person-years of observation, and 171 women were diagnosed with EC during 39,227 person-years. Height was not associated with CRC for either men (per 5-cm increment, hazard ratio (HR) = 1.00, 95% confidence interval (CI): 0.91, 1.11) or women (per 5-cm increment, HR = 1.01, 95% CI: 0.92, 1.11), nor was height associated with EC (per 5-cm increment, HR = 1.08, 95% CI: 0.94, 1.24). Hence, we observed no evidence for an association of height with either CRC or EC among persons with LS.
Reading the “Memoirs of the Life of Florence Hall” ThroughThe Long Songof the Caribbean Colonial Archive
Authors: Aljoe Nicole N 
Published: August 2020

AbstractThis article suggests that we should analyze the mediated and fragmentary narratives of the lives of the enslaved—the predominate format of such texts in the archives—as well as self-written slave narratives. Although not biographical in the same fashion as the self-written texts, these more ephemeral texts can also enhance and productively contribute to our understandings of the literary and discursive features of the era. In order to attend to such texts, we need to develop more dynamic reading strategies for the multiple voices and varied formats common to them. One such strategy is animated by arguments about alternative histories suggested by neo-slave-narrative novels like Andrea Levy’s The Long Song (2011). I suggest that drawing on the models of the imaginative possibilities of neo-slave-narrative fictions, along with conceptually related links to both Edward Said’s hermeneutics of contrapuntal reading and Saidiya Hartman’s exegetics of critical fabulation, reveals how an ephemeral and fragmentary text or “textual splinter” like “Memoirs of the Life of Florence Hall” may yield more complex readings and help us consider what the lives of the enslaved might have looked like, as well as offers portraits of the discursive networks in which it existed.The … archive was not meant to encode the nuances of Hall’s voice or memories of her experiences. The archive was instead meant to document the power of the establishment and the data that would be useful to its perpetuation.