bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improving the printing process stability and the geometrical accuracy of the parts manufactured by the additive techniques
Authors: Borovkov A I , Maslov L B , Ivanov K S , Kovaleva E N , Tarasenko F D , Zhmaylo M A 
Published: December 2020

Abstract
Current research is devoted to the computer-aided engineering application for direct modeling of the additive manufacturing process and detailed analysis of the resulting shape of the formed part. The utilized approach is based on the idea that it is possible and efficient to perform a numerical simulation of the process of a layer-by-layer building of the analyzed part, considering all the required mechanical and thermal effects. The results of such simulation should allow obtaining the detailed information about the deformed shape of the printed part before running the printing process itself. Such approach allows avoiding the unsuccessful printing attempts, improve the integral stability of the production process and reduce its cost. The paper presents the methodology of preparing a “digital twin” of the additive manufacturing process performed with AlSi10Mg alloy using one of metal machines and running a simulation of the manufacturing process for a representative structural component. The study has shown that implementation of modeling of the manufacturing process before the printing process leads to significant shape improvements of the parts printed, especially in case of performing additional optimization of the support structures. The research outcomes can be well applied for improving the production processes in the companies working with additive manufacturing in order to increase the stability of the processes and accuracy of the printed parts.
Analyzing Causes of Damage to the Plunger Stem and Cylinder of a Sucker Rod Pump
Authors: Strekalovskaya D A , Davydov A D , Al’khimenko A A , Lyashenko D V 
Published: December 2020

Abstract
This paper presents the results of analyzing the reasons for damage to the plunger stem and cylinder of sucker rod pumps, which were operated in an environment with hydrogen sulfide. The chemical composition, mechanical properties, and hardness of the products were studied in order to assess how the material of the parts conforms to the technical documentation. Likewise, the reasons for damage were analyzed using an optical electron microscope. It was established that damage to the plunger stem happened along the first thread of the threaded connection of the rod inside the body of the adapter, while destruction to the cylinder was observed in the area of the threaded connection to the body of the pump’s suction valve. Results showed that the main reason for damage was the combination of a corrosive H2S environment and mechanical stress, which led to sulfide corroded cracking under stress. Suggestions were put forward about extending the service period of the SRP parts and reducing the likelihood of their destruction.
Composite tube damage evaluation in aggressive oil-gas field
Authors: Alekseeva E L , Kurakin M K , Kovalev M A , Lapechenkov A A , Shishkova M L , Devyaterikova N A 
Published: December 2020

Abstract
The purpose of this article is to lead a research program to assess the damaging of liners of a composite tube for operation in oil-gas fields containing carbon dioxide, including those with minor amounts of hydrogen sulfide at standard conditions and under conditions of elevated temperature and pressure. To assess the level of corrosion resistance of the composite tube liner, stress corrosion cracking tests were carried out, autoclave tests for general corrosion at elevated temperatures and pressures were also carried out, and electrochemical studies were carried out to assess the equilibrium corrosion potential and calculate corrosion rates analyzing Tafel curves.
Methods of improving service quality and increasing the reliability of locomotives registered in operational locomotive depot Agryz in the locomotive service depot Agryz-South
Authors: Kozlova A T 
Published: December 2020

Abstract
The method for managing the technological processes of repairing diesel locomotives registered at the Agryz operational locomotive depot in the Agryz-Yuzhny service locomotive depot using network planning has been developed to monitor and adjust the performance of technological operations, taking indicators of technological preparation of repair into consideration. Using improved non-standard equipment in technological processes of current repairs of diesel locomotives with motor-axial rolling bearings allows mechanization of technological operations during the assembly of a wheel-motor unit to improve the quality of the technological process and reduces the time spent in repair. Assembly operations have a special place in mechanical engineering. It is at this stage that various connections of individual parts and assemblies arise and indicators of the reliability of a technical object are formed.
Numerical and experimental investigation of the main parameters of a small gas turbine engine
Authors: Tikhonov A S , Borovkov A I , Tamm A Yu 
Published: December 2020

Abstract
A numerical and experimental study of the main parameters of a small gas turbine engine is conducted in this paper. An experimental bench was developed for determining both the integral parameters (thrust and fuel consumption) of the gas turbine engine and the local parameters (temperatures and pressures) of its gas-air path. Besides, full-scale gas-turbine engine tests Jetcat P200-RX were done with and without gas-air path equipment. The existing small gas turbine engine sample was digitized and the gas flow in its gas-air path was simulated using the CFD method in a three-dimensional setting in ANSYS CFX. A comparative analysis of the results of full-scale tests and CFD modeling was carried out.
Numerical simulation of solid data carrier grinding process
Authors: Monakhovskiy G V , Kharaldin N A , Aleshin M V , Klyavin O I 
Published: December 2020

Abstract
In this article we consider a general approach and method to assess the solid data carrier destruction in a shredder using grinding rotors with teeth. Numerical simulation of the grinding process was carried out in the LS-DYNA by discrete element method and finite element method (FEM-DEM). Evaluation and comparison with a real grinding process was based on a phenomenological approach.
BIW structure development in accordance with passive safety requirements using several optimization methods
Authors: Fedotova O , Korostelkin A , Zatylkin K , Gorunov V , Efimov A 
Published: December 2020

Abstract
The article is focused on the BIW characteristics and behavior optimization in terms of EURONCAP rules. Variable parameters: part’s shape, material, thickness. With multi-disciplinary, topological and topography optimization the most acceptable BIW behavior during virtual crash-tests has been achieved. All design improvements were implemented in accordance with stamping and assembly capabilities, restrictions on the use of each type of material. These requirements are especially important because updated design has been developed for the final stage and supposed to be frozen.
The method of RTM process modeling using porous medium
Authors: Efimov-Soini N , Kiauka M , Borovkov A 
Published: December 2020

Abstract
This paper proposes a method to simulate the Resin Transfer Molding process by using Ansys Fluent software. The offered approach permits to calculate impregnation time, to predict dry zones after impregnation and proposes a method to calculate porosity of the final product to predict the mechanical properties. The method is illustrated in the plate resin impregnation case.
Review of the current state of research of microturbine units
Authors: Myakishev N , Laptev M , Pekarskii A , Barskov V , Rassokhin V , Chernikov V , Semakina E , Yadikin V , Matveev Y , Smetankin A 
Published: December 2020

Abstract
The article provides an overview of the current state of micro-turbine units with an external supply of heat. In particular, there have been described various approaches of companies to the creation of this type of units, priority directions of micro-turbines design have been identified, too.
A wide-angle and ultra-wideband metamaterial absorber based on a cascaded graphite involute windmill blade structure
Authors: Hu CaiXing , Tian XingLiang , Zhou ZiWei , Zhang Dan , Zhang HaiFeng 
Published: December 2020

Abstract
In this paper, a wide-angle and ultra-wideband (UWB) metamaterial absorber (MA) consisting of cascaded graphite involute windmill blade (IWB) structures operating at the terahertz domain is proposed. The operating bandwidth of such an MA can be tuned by the incident angle and structural parameters of IWB. Via simulations of electric field distributions and power flow, the UWB absorption mechanism can be attributed to the strong interaction between multiple electric resonances. Simulation results report that the proposed MA can sustain a UWB absorption whose relative bandwidth reaches over 100% as the incident angle varies from 0° to 60° for both transverse electric and transverse magnetic modes, which provides a great potential value in the high-performance absorber.
Experimental investigation of phase equilibria in the Mg-rich corner of Mg-Nd-Sc system
Authors: Xia Zhixiang , Xu Guanglong , Tao Xiaoma , Wang Jiang , Cui Yuwen 
Published: December 2020

Abstract
Phase equilibria in the Mg-rich corner of Mg–Nd–Sc ternary system was studied by using the equilibrated alloys method. The partial isothermal sections at 500 °C, 530 °C, and 550 °C were constructed by analyzing the phase constitution and the chemical compositions of the present phases in 19 alloy samples. The Mg3(Mg, Nd, Sc) phase exhibited noticeable ternary solubility introduced by the solid solution of Mg and Sc in the Mg3Nd lattice. (Mg_hcp) showed a narrow homogeneity range paralleling to Mg–Sc binary boundary, whereas Mg41Nd5 showed negligible ternary solubility at all three temperatures. The three-phase equilibrium region of (Mg_hcp) + Mg41Nd5 + Mg3(Mg, Nd, Sc) dominated the Mg-rich corner and was surrounded by three two-phase equilibrium regions constituted by any two of above three phases. The primary crystals and the solidification pathways of alloys in the Mg-rich corner were analyzed via the as-cast microstructure. The matrix phases of (MgSc_bcc) and/or (Mg_hcp) together with the precipitations of Mg3(Mg, Nd, Sc) and other ordering structures could provide additional space to optimize microstructure and properties of Sc-alloyed Mg–Nd alloys.
Fabrication and tribological behavior of Fe-Cu-Ni-Sn-Graphite porous oil-bearing self-lubricating composite layer for maintenance-free sliding components
Authors: Guo Junde , Du Hang , Zhang Geng , Cao Yan , Shi Junwen , Cao Wei 
Published: December 2020

Abstract
Fe-Cu-Ni-Sn-Graphite oil-bearing self-lubricating composite was prepared using powder metallurgy method through multiple sintering-rolling processes and oil impregnation vacuum-assisted method. The tribological property of the composite were characterized by a UMT-2 tribometer. And the micro-structure and worn surface of composite were investigated by an optical microscope, SEM (scanning electron microscopy), XRD (X-Ray Diffraction) and EDS (energy disperse spectroscopy). The results show that the porous oil-bearing self-lubricating composite exhibit an excellent long-term low-friction and antiwear properties. Especially, the friction coefficient of the composite after secondary rolling and sintering decreased by 38% compared to that of the sample without sintering-rolling. After sliding for 21 h, the friction coefficient of the composite still keep relatively stable at a low value. In addition, the wear resistance of the composite has greatly improved after secondary rolling and sintering. And the wear loss of the 40Cr counterpart is almost wear-free and presents oil-graphite mixture around the wear track, which reveals that solid-liquid synergetic lubrication is the potential lubrication mechanism during the sliding process.
Alignment of Dietary Patterns With the Dietary Guidelines for Americans 2015–2020 and Risk of All-Cause and Cause-Specific Mortality in the Women’s Health Initiative Observational Study
Authors: George Stephanie M , Reedy Jill , Cespedes Feliciano Elizabeth M , Aragaki Aaron , Caan Bette J , Kahle Lisa , Manson JoAnn E , Rohan Thomas E , Snetselaar Linda G , Tinker Lesley F , Van Horn Linda , Neuhouser Marian L 
Published: December 2020

Abstract
Poor diet quality is a leading risk factor for death in the United States. We examined the association between Healthy Eating Index-2015 (HEI-2015) scores and death from all causes, cardiovascular disease (CVD), cancer, Alzheimer disease, and dementia not otherwise specified (NOS) among postmenopausal women in the Women’s Health Initiative Observational Study (1993–2017). This analysis included 59,388 participants who completed a food frequency questionnaire and were free of cancer, CVD, and diabetes at enrollment. Stratified Cox proportional hazards models were fit using person-years from enrollment as the underlying time metric. We estimated multivariable adjusted hazard ratios and 95% confidence intervals for risk of death associated with HEI-2015 quintiles, with higher scores reflecting more optimal diet quality. Over a median of 18.2 years, 9,679 total deaths 3,303 cancer deaths, 2,362 CVD deaths, and 488 deaths from Alzheimer disease and dementia NOS occurred. Compared with those with lower scores, women with higher HEI-2015 scores had an 18% lower risk of all-cause death and 21% lower risk of cancer death. HEI-2015 scores were not associated with death due to CVD, Alzheimer disease, and dementia NOS. Consuming a diet aligned with 2015–2020 US dietary guidelines may have beneficial impacts for preventing overall causes of death and death from cancer.
The Effect of Attention Deficit/Hyperactivity Disorder on Physical Health Outcomes: A 2-Sample Mendelian Randomization Study
Authors: Leppert Beate , Riglin Lucy , Wootton Robyn E , Dardani Christina , Thapar Ajay , Staley James R , Tilling Kate , Davey Smith George , Thapar Anita , Stergiakouli Evie 
Published: December 2020

Abstract
Attention-deficit/hyperactivity disorder (ADHD) is associated with a broad range of physical health problems. Using different research designs to test whether ADHD has a causal role in these associations is important because comorbid health problems increase the serious social and economic impacts of ADHD. We used 2-sample Mendelian randomization (MR) to infer causal relationships between ADHD and previously implicated physical health conditions. Different MR methods were used to test the robustness and plausibility of our findings. Consistent findings underwent bidirectional and multivariable MR. We found evidence of ADHD having a causal effect on childhood obesity (odds ratio = 1.29, 95% confidence interval: 1.02, 1.63) and coronary artery disease (odds ratio = 1.11, 95% confidence interval: 1.03, 1.19) with consistent results across MR approaches. There was additional MR evidence for a bidirectional relationship between ADHD and childhood obesity. The relationship with coronary artery disease attenuated when controlling for childhood obesity. There was little evidence for inferring a causal effect on other cardiometabolic, autoimmune, allergic, and neurological diseases. Our findings strengthen the argument for effective treatment of children with ADHD, and suggest that clinicians who manage ADHD need to be aware of the risk of childhood obesity to reduce future risks of coronary artery disease.
Goals and approaches for each processing step for single-cell RNA sequencing data
Authors: Zhang Zilong , Cui Feifei , Wang Chunyu , Zhao Lingling , Zou Quan 
Published: December 2020

Abstract
Single-cell RNA sequencing (scRNA-seq) has enabled researchers to study gene expression at the cellular level. However, due to the extremely low levels of transcripts in a single cell and technical losses during reverse transcription, gene expression at a single-cell resolution is usually noisy and highly dimensional; thus, statistical analyses of single-cell data are a challenge. Although many scRNA-seq data analysis tools are currently available, a gold standard pipeline is not available for all datasets. Therefore, a general understanding of bioinformatics and associated computational issues would facilitate the selection of appropriate tools for a given set of data. In this review, we provide an overview of the goals and most popular computational analysis tools for the quality control, normalization, imputation, feature selection and dimension reduction of scRNA-seq data.
Evolutionary and codon usage preference insights into spike glycoprotein of SARS-CoV-2
Authors: Malik Yashpal Singh , Ansari Mohd Ikram , Kattoor Jobin Jose , Kaushik Rahul , Sircar Shubhankar , Subbaiyan Anbazhagan , Tiwari Ruchi , Dhama Kuldeep , Ghosh Souvik , Tomar Shailly , Zhang Kam Y J 
Published: December 2020

AbstractInteraction of SARS-CoV-2 spike glycoprotein with the ACE2 cell receptor is very crucial for virus attachment to human cells. Selected mutations in SARS-CoV-2 S-protein are reported to strengthen its binding affinity to mammalian ACE2. The N501T mutation in SARS-CoV-2-CTD furnishes better support to hotspot 353 in comparison with SARS-CoV and shows higher affinity for receptor binding. Recombination analysis exhibited higher recombination events in SARS-CoV-2 strains, irrespective of their geographical origin or hosts. Investigation further supports a common origin among SARS-CoV-2 and its predecessors, SARS-CoV and bat-SARS-like-CoV. The recombination events suggest a constant exchange of genetic material among the co-infecting viruses in possible reservoirs and human hosts before SARS-CoV-2 emerged. Furthermore, a comprehensive analysis of codon usage bias (CUB) in SARS-CoV-2 revealed significant CUB among the S-genes of different beta-coronaviruses governed majorly by natural selection and mutation pressure. Various indices of codon usage of S-genes helped in quantifying its adaptability in other animal hosts. These findings might help in identifying potential experimental animal models for investigating pathogenicity for drugs and vaccine development experiments.
Computational methods for the prediction of chromatin interaction and organization using sequence and epigenomic profiles
Authors: Tao Huan , Li Hao , Xu Kang , Hong Hao , Jiang Shuai , Du Guifang , Wang Junting , Sun Yu , Huang Xin , Ding Yang , Li Fei , Zheng Xiaofei , Chen Hebing , Bo Xiaochen 
Published: December 2020

AbstractThe exploration of three-dimensional chromatin interaction and organization provides insight into mechanisms underlying gene regulation, cell differentiation and disease development. Advances in chromosome conformation capture technologies, such as high-throughput chromosome conformation capture (Hi-C) and chromatin interaction analysis by paired-end tag (ChIA-PET), have enabled the exploration of chromatin interaction and organization. However, high-resolution Hi-C and ChIA-PET data are only available for a limited number of cell lines, and their acquisition is costly, time consuming, laborious and affected by theoretical limitations. Increasing evidence shows that DNA sequence and epigenomic features are informative predictors of regulatory interaction and chromatin architecture. Based on these features, numerous computational methods have been developed for the prediction of chromatin interaction and organization, whereas they are not extensively applied in biomedical study. A systematical study to summarize and evaluate such methods is still needed to facilitate their application. Here, we summarize 48 computational methods for the prediction of chromatin interaction and organization using sequence and epigenomic profiles, categorize them and compare their performance. Besides, we provide a comprehensive guideline for the selection of suitable methods to predict chromatin interaction and organization based on available data and biological question of interest.
Anticipatory Futures: Framing the Socio-technical Visions of Online Ratings and Reviews inWired
Authors: Chan Ngai Keung 
Published: December 2020

AbstractDrawing insights from the sociology of expectations and recent studies on future visions in communication studies, this article traces and analyzes how Wired—a technology news provider and socio-technical vanguard whose vision is to uncover technological innovations—anticipated socio-technical visions of online ratings and reviews over two decades (1998–2018). The qualitative textual analysis of Wired’s coverage revealed two socio-technical visions, namely, promissory futures and problematic futures. The former embraced neoliberal discourses of consumer empowerment and accountability, whereas the latter entailed a pessimistic evaluation of the manipulation of online ratings and the potential of adopting online ratings beyond e-commerce platforms. The visions represented in Wired largely followed the logic of “technological solutionism.” This study affords opportunities for thinking about the role of popular media discourses and temporalities in shaping imagined futures of emerging technologies.
Treatment with compounded fluticasone suspension improves the clinical, endoscopic, and histologic features of eosinophilic esophagitis
Authors: Ketchem Corey J , Reed Craig C , Stefanadis Zoe , Dellon Evan S 
Published: December 2020

Summary
No approved medication exists for the treatment of eosinophilic esophagitis (EoE) in the United States, which forces patients to utilize off-label drugs and/or create their own formulations. We assessed the efficacy of a standardized compounded fluticasone suspension. To do this, we performed a retrospective cohort study identifying all EoE patients treated with compounded fluticasone. Compounded fluticasone was prescribed during routine clinical care and dispensed by a specialty compounding pharmacy. Clinical data were extracted from medical records. Outcomes (symptomatic, endoscopic, and histologic) were assessed after the initial and last compounded fluticasone treatment in our system. There were 27 included patients (mean age 34.2; 67% male; 96% white) treated for a mean length of 5.4 ± 4.4 months. The majority (89%) previously utilized dietary elimination or topical corticosteroids, and many (75%) had primary non-response or secondary loss of response to these treatments. After starting compounded fluticasone, symptoms and endoscopic findings improved [dysphagia (89 vs. 56%, P = 0.005), food impaction (59 vs. 4%, P = 0.003), heartburn (26 vs. 4%, P = 0.01), chest pain (26 vs. 8%, P = 0.05), white plaques (63 vs. 32%; P = 0.005), furrows (81 vs. 60%; P = 0.06), and edema (15 vs. 4%; P = 0.16)]. The median of the peak eosinophil counts decreased from 52 to 37 eos/hpf (P = 0.10) and 35% of patients achieved &lt;15 eos/hpf. In conclusion, compounded fluticasone provided a significant improvement in symptoms and endoscopic findings, with more than a third achieving histologic response in a treatment refractory EoE population. Compounded fluticasone should be considered as an EoE management option.