bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Manufacturing of a 3D Printer for Teaching and Research
Authors: Noorani Rafiq , Lynch Michael , Hodgkiss Patrick , Fumo Matt , Burke Christopher 
Published: October 2019

Abstract
The goal of this paper is to design and fabricate a 3D printer that will be the most accurate and cost-effective printer possible, while still being faster than the Rapid Prototyping (RP) Lab’s Stratasys FDM-1650 at Loyola Marymount University. This project is done to greatly increase the capability of the RP lab in addition to exposing students to the design and fabrication of a 3D printer. To complete the construction of the printer, the design is originally generated in Solidworks to ensure the components would work together effectively and to aid with design selection. The frame is then constructed using V-slot aluminum and RP parts that are made in house. Following which, the motors and extruders are assembled according to design plans and the circuitry is wired through an Arduino based programming system. Further steps needed to be taken were reconstructing the Y-axis motion and calibrating all aspects of the machine to finalize the assembly of the printer. The printer has been completed recently and is being used for teaching and research on design and manufacturing applications.
Transonic flow hysteresis in divergent bent channels
Authors: Kuzmin A 
Published: October 2019

Abstract
This paper presents a numerical study of the 2D and 3D turbulent airflows in divergent 9°-bent channels. The incoming flow is supersonic, whereas the exit flow may be either supersonic or subsonic. Solutions of the Reynolds-averaged Navier-Stokes equations are obtained with a finite-volume solver ANSYS CFX using the Spalart-Allmaras and Shear Stress Transport k-ω turbulence models. The solutions reveal a significant hysteresis of the flow field under variations of the free-stream Mach number or exit pressure. At the ends of hysteresis bands, the flow pattern changes crucially due to instability of a shock wave formed near the bend of channel. The instability is caused by the shock foot interaction with an expansion flow developed over the convex wall of channel. Boundary conditions, in which the flow admits a double hysteresis, are figured out. The occurrence of non-unique flow regimes must be taken into account in the advanced intake design, as different losses of the total pressure may cause different trusts of an air breathing engine.
Numerical study of a shock-wave boundary-layer interaction: compression ramp flow-fields
Authors: Elsayed O A 
Published: October 2019

Abstract
Shock-wave boundary-layer interaction (SBLI) causes a serious aerodynamic and structural problems, therefore understanding its complex flow phenomenon is essential. Flow properties at the interaction region were numerically predicted via solving steady, compressible, 2D Navier-Stokes Equations with Roe-FDS flux type and a second order upwind flow discretization. Two compression ramps with 12° and 24° angles were investigated. The flow over a 12° ramp were fully attached with a λ-shock type and a limited upstream influence. Wall temperature increases to 2.55 times the edge temperature value and affected region increases with the downstream distance. The pressure field for the 24° ramp case reveals a substantial increase in the upstream influence due to the strong shock. A larger shock-leg at the wall provoke a significant flow separation and the wall temperature increases to 2 times the edge temperature value. Separation bubble is generated at the corner, with a separation length of 3.25 times the boundary layer thickness. This leads to a noticeable increase in the total pressure drag. Simulated results were fairly agreeing with the experimental result at the separation region.
Noise sensitivity of a bio-inspired echolocation model
Authors: Georgiev Krasin , Nikolova Radina 
Published: October 2019

Abstract
The Spectrogram Correlation And Transformation (SCAT) receiver is often cited as a model of bat auditory system that is responsible for echolocation signal processing and super resolution in range. We explore the response of a simplified baseband version of SCAT (BSCT) for two targets in white Gaussian noise. Knowing the loss of signal-to-noise ratio (SNR) relative to the matched filter (MF) is important for any practical applications of the algorithm. We show that this loss is 6~dB and increases if a critical noise level is surpassed.
Web-based virtual reality for simulation of a heavy manipulator with a freely suspended payload
Authors: Mitrev R P , Tudjarov B N , Todorov T S 
Published: October 2019

Abstract
The paper presents the development of a Web-based Virtual Reality (VR) environment for simulation and visualization of the motion of a hydraulically driven heavy manipulator with a freely suspended payload. Two main problems are resolved in the paper. First, a combined mathematical model of the manipulator, considered as a 2 DOF discrete mechanical model is derived. It represents the dynamics of the two key functional subsystems of the manipulator – mechanical subsystem, consisting of a link and freely suspended payload and hydraulic subsystem, consisting of a hydraulic cylinder. Second, by the use of the contemporary Web technologies a VR environment for simulation, visualization and animation of the obtained results is developed. The produced VR environment is easy reused and shared with other users and thus considerably facilitates the design, investigation, and e-learning of such type of system.
Hydroacoustic stand for evaluating underwater sound systems in a measurement pool
Authors: Iliev Iliyan , Kolev Nikolai 
Published: October 2019

Abstract
Measurement of sonar parameters in laboratory conditions is a powerful tool for development, control and diagnostics. The realization of such a tool requires the construction of a measuring pool and its equipment with digital channels for receiving and generating sonar signals. An essential requirement for the measuring equipment is to quantify time and amplitude signals with the necessary accuracy and speed. The paper presents a new stand for evaluating the parameters of active and passive sonar systems. The stand is based on the PXI console of National Instruments and the underwater receiving channel of Bruel & Kjaer. Software solutions for the synthesis, transmission, reception and analysis of acoustic signals with different pulse lengths and intrapulse modulations have been developed through the LabVIEW software platform. VI instruments were developed for digital processing, and visualization of signals, and the ability to measure Sonar Transducer parameters in a test tank.
Flow characteristics of gas injectors
Authors: Ivanov Zdravko , Stoyanov Stoyan , Mihaylov Veselin , Santos Helder 
Published: October 2019

Abstract
The operation of Internal Combustion Engine (ICE) with gaseous fuels is characterized by the specificity of the fuelling process. Nowadays the most common system is the one in which after lowering its pressure the gas fuel is delivered to the engine intake manifold by means of gas injectors. This leads to a difference in the laws of fuel supply relative to the original gasoline injection system that dispenses fuel in liquid phase. Theoretical research has been done and gas leakage has been found to be critical under engine normal operating conditions, that is, it depends on fuel pressure and not on the environment in which the fuel leaks (intake manifold). An experimental test stand was set-up and multiparametric characteristics of a common construction bottom feed gas injectors were determined experimentally under conditions very close to the real working ones.
Analysis of some issues in the theoretical studies of unloading flaps strength of wagon series Falns
Authors: Slavchev S , Stoilov V , Maznichki V , Purgic S 
Published: October 2019

Abstract
The self-unloading wagons with saddle-shaped floor, known under the serial designation Falns, are equipped with unloading flaps contributing to the rapid mechanized unloading of the wagon. In general, the theoretical and experimental studies of such wagons are standardized in EN 12663-2: 2010. Unlike many other nodes, no specific conditions (load forces, application locations, supports, etc.) have been described in the standard in order to properly investigate the strength of unloading flaps. This leads to the use of various methods for determination of their strength, which on other hand can lead to their improper design. The report analyzes the current used methods for the investigation of the unloading flaps strength, as well as their advantages and disadvantages. It is recommended to develop a specific methodology, reflecting the specifics of the construction and its way of operation. In this way, unification in the investigation of the unloading flaps strength will be achieved, as well as avoiding of the oversizing or undersizing of these responsible nodes in the Falns series wagons.
Modelling passenger service rate at a transport hub serviced by a single urban bus route as a queueing system
Authors: Asenov A , Pencheva V , Georgiev I 
Published: October 2019

Abstract
In this paper the daily service rate at a bus stop from the urban passenger transport network is reviewed. The bus stop is located close to a railway and a bus station. A mathematical model has been developed for the average daily incoming flows of passengers to the monitored bus stop. The service rate has been modelled using pulse Dirac delta functions. The daily irregularity of operation of a particular bus line at this bus stop has been evaluated and the operation of the system has been modelled as a queueing system, in order to assess the capacity of the bus line and the organisation of work. The type of incoming flow, as well as the service rate has been defined as a non-stationary Poisson flow. A system of differential-algebraic equations has been chosen as a model according to Kolmogorov’s model for stochastic processes. A specific numerical method for solving system differential equations has been devised with Dirac delta functions in the right part of the equations. Under non-stationary conditions, the basic values of the system parameters have been calculated and an application has been created in a MatLab environment. The results are suitable for accurately determining the routing speed and the average waiting time of the passengers at the bus stop. They can also determine the refusal of passengers to wait at the passenger stop.
Monitoring of properties of epoxy molding compounds used in electronics for protection and hermetic sealing of microcircuits
Authors: Kokatev A N , Iakovleva N M , Stepanova K V , Ershova N Yu , Belov K V 
Published: October 2019

Abstract
It is known that epoxy molding compounds have a significant impact on productivity, service life and reliability of electronic microcircuit components. Wrong choice of a molding mixture can lead to mechanical stresses, deformation, cracking or lamination of the protective packaging followed by microcircuit breakage. The study summarizes information on composition, main operating characteristics and application methods of epoxy molding compounds as well as their impact on microcircuit shape distortion. Main methods for control of physical and mechanical properties of epoxy molding compounds with the most significant impact on microcircuit hermetic sealing and on formation of different kinds of defects in the protective packing.
Simulation and analysis of the shaft strength of a centrifugal pump in an in-situ leaching method of uranium
Authors: Sadykov M P 
Published: October 2019

Abstract
This research shows the performance of the strength analysis and dynamic analysis of the shaft strength of a centrifugal pump in an integrated NASTRAN / PATRAN system. There is conducted the calculation of a mechanical scheme for determining the stress-strain state of the rotor shaft of a centrifugal pump and constructed a 3D-model of the rotor of a seven-step centrifugal pump. Furthermore, there are determined voltage levels for zero and maximum flow. On the basis of these dynamic calculations, a damping element has been proposed that ensures a smooth entrance of CP into an operating mode - a magnetic coupling.
Workstations Industry 4.0 for instrument engineering products
Authors: Zakoldaev D A , Shukalov A V , Zharinov I O , Zharinov O O 
Published: October 2019

Abstract
The actual task is to design an automatic work place to be applied in the Industry 4.0 to prepare electronically the item designing component technical documentation. An automatic work place is a part of Industry 4.0 digital factory instrument ware. Digital factory is a new type of project company functioning with innovation technologies. Here is an analysis of technical, program and algorithmic points of item projection in the existing companies of the Industry 3.0. There is a functional scheme of designer automatic work place in the Industry 3.0 company. We can see that new progressive innovative technologies in project companies require new approach to organize an automatic work place. The given functional scheme of designer automatic work place in the Industry 4.0 company requires implementation into project procedures cloud calculation technologies, industrial internet of things and other.
Instar Determination of Blaptostethus pallescens (Hemiptera: Anthocoridae) Using Artificial Neural Networks
Authors: Carmo Daiane das Graças , Farias Elizeu de Sá , Costa Thiago Leandro , Queiroz Elenir Aparecida , Nascimento Moysés , Picanço Marcelo Coutinho 
Published: October 2019

AbstractBlaptostethus pallescens Poppius is an important predator of vegetable pests in tropical regions. The correct identification of the stages of the life cycle of predatory species is crucial, since different stages may present different rates of pest consumption. Artificial neural networks (ANNs) are computational tools with a structure based on the human brain. With applications in several fields, ANNs have been applied in pest management for identification of pest species, spatial distribution modeling, and insect forecasting. The objective of this study was to apply ANNs as a method for the instar determination of B. pallescens using three morphometric measures (head width, body width, and body length). Cluster analysis was performed to categorize the insects in instars according to the morphometric variables. Subsequently, the ANNs were trained for instar determination using the morphometric measures as input variables. The ANNs tested (with 2, 4, 6, 8, 10, and 12 hidden neurons) provided proper data fitting (R2 &gt; 98%). However, due to the parsimony principle, the network with hidden layer size 6 was selected. This study shows the successful application of ANNs in the instar determination of B. pallescens, which would not be possible using classical methods.
Cytologic Evaluation of Tumor-Infiltrating Lymphocytes for Adoptive Cell Therapy
Authors: Monaco Sara E , Pantanowitz Liron , Xing Juan , Cuda Jackie , Kammula Udai S 
Published: October 2019

Abstract

Objectives
Novel immunotherapeutic options for refractory metastatic cancer patients include adoptive cell therapies such as tumor infiltrating lymphocytes (TILs). This study characterizes the clinicopathologic findings in a cohort of TIL specimens.

Methods
Patients with metastatic malignancy who were eligible had TILs from their metastases grown and expanded and then sent to pathology.

Results
A total of 11 TIL specimens (10 melanoma, 1 adenocarcinoma) from patients enrolled in an experimental clinical trial were reviewed. All specimens showed more than 200 lymphoid cells, stained positive for lymphoid markers confirming an activated cytotoxic T-cell immunophenotype, and morphologically showed an intermediate-sized population with immature chromatin and frequent mitoses. Six cases (55%) showed large cells with nucleomegaly and prominent nucleoli.

Conclusions
This report is the first describing cytopathologic findings of autologous TIL therapy including adequacy guidelines and expected cytomorphologic and immunophenotypic findings. To meet this novel clinical demand, a predefined cytology protocol to rapidly process and interpret these specimens needs to be established.
Ethnic Variability Among Jews is Associated With Hypertension: Results of a Nationwide Study of 1.44 Million Adolescents
Authors: Fishman Boris , Leiba Adi , Twig Gilad , Shlomai Gadi , Orr Omri , Landau Regev , Derazne Estela , Grossman Ehud 
Published: October 2019

AbstractBACKGROUNDAdolescent hypertension is a major cardiovascular risk factor that may be related to ethnic variability. Contemporary Jews can be divided into three distinct ethnic groups: Ashkenazi, Oriental, and Sephardi origins. The aim of our study was to investigate the association of ethnicity and hypertension among Israeli adolescents.METHODSWe conducted a population retrospective cohort study of males and females, aged 16–19, eligible for mandatory military service in the Israeli Defense Forces (IDF) between 1994 and 2013. Medical and sociodemographic data, including body mass index (BMI), age, years of education, residential socioeconomic status, and parents’ country of birth, were retrieved. Ethnicity of the parents was based upon their country of birth. The examinees were assigned to a certain ethnicity only if both parents had the same ethnicity. Logistic regression models were applied to compute the odds ratio (OR) and 95% confidence intervals (95% CI) for hypertension among the different Jewish ethnicities.RESULTSThe final cohort included 1,445,176 adolescents, of whom 716,289 were born to parents of the same Jewish ethnicity. Ashkenazi ethnicity was associated with an increased risk of hypertension compared to Sephardi and Oriental ethnicities (adjusted OR of 2.93 (95% CI, 2.52–3.41) and 1.56 (1.38–1.77), respectively). Oriental ethnicity was associated with an increased risk of hypertension compared with the Sephardi ethnicity (OR of 1.91 (1.60–2.27)). Similar results were observed in a sub-analysis, which included only Israeli-born examinees.CONCLUSIONSOur results indicate that ethnicity is significantly associated with hypertension among Jewish adolescents. Ashkenazi Jews had the highest risk of hypertension.
Adverse Childhood Experiences are Associated with High-Intensity Binge Drinking Behavior in Adulthood and Mediated by Psychiatric Disorders
Authors: Jung Jeesun , Rosoff Daniel B , Muench Christine , Luo Audrey , Longley Martha , Lee Jisoo , Charlet Katrin , Lohoff Falk W 
Published: October 2019

AbstractAimHigh-intensity binge drinking (HIBD), defined as two or more times the gender-specific binge threshold, is rapidly increasing in the USA; however, the underlying contributing factors are poorly understood. This study investigated the relationship of adverse childhood experiences (ACEs) and HIBD.MethodsTwo independent, cross-sectional samples were analysed: (a) past 12-month drinkers in the National Epidemiological Survey on Alcohol and Related Conditions-III (NESARC-III; n = 25,552) and (b) the National Institute on Alcohol Abuse and Alcoholism (NIAAA) clinical sample (n = 1303). Multinomial logistic regressions were utilized to estimate adjusted odds ratios (AORs) of ACEs on HIBD. Mediation analysis was performed to examine the relationship between the past 12-month psychiatric disorders, ACEs, and HIBD.ResultsIn the NESARC-III sample, prevalence of ACEs increased across all binge levels with the highest prevalence in extreme HIBD; ACEs were associated with higher odds for HIBD (level II, odds ratio (OR) = 1.2–1.4; P = 0.03–0.001; level III, OR = 1.3–1.9; P &lt; 0.001). Prevalence of DSM-5 diagnoses also increased across all binge levels. Substance use disorders (SUD), mood, personality and post-traumatic stress disorders (PTSD) conferred the highest odds with extreme HIBD (SUD: OR = 21.32; mood: 1.73; personality: 2.84; PTSD: 1.97; all Ps &lt; 0.001). Mediation analyses showed that the association between ACEs and HIBD was fully mediated through SUD (proportion mediated: 70–90%) and partially through other psychiatric disorders (20–80%). In the NIAAA sample, ACEs were 2–5 times more prevalent in extreme HIBD with higher odds (ORs = 3–8, P &lt; 0.001) compared with non-bingers.ConclusionACEs were associated with significantly increased odds of HIBD and the relationship may be mediated by psychiatric disorders.
Who Are We? Feminist Ambivalence in Contemporary Literary Criticism
Authors: Mendelman Lisa 
Published: October 2019

AbstractFeminism exists in a perpetual identity crisis—with a vexed past, an unstable present, and an uncertain future. A scholar interested in this charged identity must manage such existential conditions in order to enable their transformative ambitions. Historicizing Post-Discourses (2017), Bodies of Information (2019), and Selling Women’s History (2017) take up this cognitive and corporeal challenge and largely meet it. In these three books, feminism’s endemic ambivalence becomes a resource for literary and cultural criticism. Focused on popular, digital, and material cultures in the twentieth- and twenty-first-century US, these volumes dramatize the merits and drawbacks of irresolution and resist a definitive conclusion about what feminism, both past and present, necessarily means for contemporary scholarship. Instead, we get alternative archives and, hopefully, better practices. Analyzing mass media, data visualizations, and consumer products, these studies engage new materials to flesh out the gendered, racialized human body at their common center. They rethink feminist historiography and demonstrate the myriad ways in which the sense of an ending continually renews and unsettles feminism’s search for a useable past. These works aim to create strategic alliances: they drive at embodied, material concerns, foreground questions of pedagogy and other modes of public interchange, and embrace a style of advocacy that rejects such extreme position-taking and instead embraces ambivalence.