bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Effect of Interference of Shallow Foundation on Settlement of Clay Soil
Authors: Altaweel Akram A , Shakir Ressol R 
Published: March 2021

Abstract
As a result of urban development, buildings were constructed adjacent to each other due to the limited construction area. As a result of this neighboring of buildings, there are often signs of damage to the structures that indicate a change in the soil’s behavior supporting the structure in terms of bearing capacity and settlement. This paper presents a numerical study using 3D Plaxis application finite element analysis to investigate the effect of the foundation interfering on the settlement of clay soils. This effect is investigated on two types of foundations, a strip foundation of 1 m wide and a square foundation of 1.5 m wide. Three cases of interference and their effect on the settlement are studied, the first case of two adjacent striped foundations, the second case of two adjacent square foundations, and the third case of two adjacent foundations, one of which is striped and the other is square. The study also adopts the imposition of a case study, in which a new building is constructed adjacent to an old building, where the effect of this juxtaposition on the settlement of the foundations of the old building is studied. The investigation results showed that the settlement in the case of adjacent strip foundations increased by 314% over the settlement of the isolated foundation, and the effect ratio decreased non-linearly with the increase in the distance between the two foundations until it fades at a distance of 7B. In the case of adjacent square foundations, the settlement increases by 194% compared to the settlement of the isolated foundation, and the effect ratio decreases non-linearly, with the distance between the two foundations increasing until it fades at a distance of 4B. In the case of a strip foundation adjacent to another square, the settlement of the strip foundation increases by 152% over the settlement of the insulated foundation, while the settlement of the square foundation increases by 164% over the settlement of the insulated basis. The aforementioned results make the option of two adjacent foundations of different types less effective and more acceptable than the two adjacent foundations of the same type. The results of the investigation of a new building adjacent to an old building also show an increase in settlement of up to 177% over the settlement in the isolated building, and also show that when increasing the depth of the foundation of the new building from 1m to 4m that reduces the risks for the old building by 42%.
The deterministic component of the traffic flow intensity
Authors: Boyarshinov M G , Vavilin A S 
Published: March 2021

Abstract
The information obtained from enforcement complexes of traffic rules allows determining in real time the traffic flow intensity over long periods of time. The analysis of the obtained dependencies leads to the conclusion that there is a periodic deterministic component in the characteristic of the traffic flow intensity. The using of the smoothing procedure allows one to define the deterministic and stochastic components, which are qualitatively different on workdays and weekends. Statistical indicators of stochastic distributions of traffic flow intensities and random components isolated from them are determined. The estimates of the correspondence of the obtained curves to the normal law of probability distribution were carried out. It is shown that the deterministic components of the traffic flows intensity both on working days and on weekends are similar in shape and location of maximum and minimum values. It seems appropriate to use deterministic components for predicting traffic flows, controlling the operation of traffic lights, monitoring equipment operation, as well as in the reconstruction, design and construction of roads and road facilities.
Minimizing geometric tests in CAAP-systems
Authors: Bozhko A N 
Published: March 2021

Abstract
The article is devoted to modeling geometric obstacles in the assembly of complex products. The problem of minimizing the number of geometric tests is considered. Two assertions about geometric inheritance in the assembly of technical systems are introduced. Based on these assertions, a game-theoretic model has been developed. The model made it possible to minimize the number of geometric tests. It is a game of decision-maker and nature by coloring the vertices of an ordered set in two colors. A classification of ordered sets is proposed. The computational experiment on coloring of ordered sets of each class using different criteria is carried out. The experiment made it possible to determine the optimal criteria for the coloring ordered sets of each class. The use of these criteria allows minimizing the labor intensity of geometric analysis in computer-aided assembly planning.
Experimental study for choosing an active substance in a microcracks detection system in the turbine blade
Authors: Grinkrug M S , Balli M Kara , Tkacheva J I , Novgorodov N A 
Published: March 2021

Abstract
In this work, an experiment was carried out that allows choosing an active substance in the system for early detection of microcracks in the blades of gas turbine engines. The aim of the work is to compare several active substances by measuring the signal generated by each of them at the same temperatures and concentrations of the active substance. A current signal is obtained by applying a voltage between two electrodes placed in a stream of hot gas. The strength of the electric current arising between the electrodes in the hot gas flow depends on the ionization of the gas caused by the active substance. The current signal is the main criterion for choosing an active substance. A study was also carried out on the effect of gas temperature on the strength of the signal caused by the active substance. This experiment is one of the main stages in the creation of a system for detecting microcracks in gas turbine blades.
Radio-frequencies technologies for local communication in cyber-physical environment
Authors: Daudov I M , Gavrilova Zh L , Iakovkina T N 
Published: March 2021

Abstract
The paper is devoted to the Internet of Things which is becoming more popular and, in particular, to wireless connections and technologies. The paper considers two technologies that are currently most widely used on the Internet of Things: Bluetooth and Wi-Fi. The milestones of their development are considered, as well as advantages and features of each technology. Various devices that employ Bluetooth and Wi-Fi technologies and their interaction are described. The conclusion about the perspectives of development of Wi-Fi technology is made.
Simulation in the study of operating experience and application of the latest technology for the repair of rod plunger pumps
Authors: Galimullin M L , Khabibullin M Ya , Suleimanov R I 
Published: March 2021

Abstract
Insufficient attention has been paid to the issues of repair and increase of the service life of plunger borehole pumps used in the oil production industry. The oil company Bashneft aims to increase the life and the IRP of borehole pumps. For this purpose, a lot of work has been done to analyze downhole equipment failures across the entire stock of oil wells equipped with sucker rod pumps. To repair the plunger pair of sucker rod pumps, all the documents (a technical task and technical conditions for repairs) were developed and the technological process was prepared. For the fields NGDU Ufaneft and NGDU Krasnokholmneft, the best results were achieved by pumps with a landing group (0.06–0.11), and for NGDU Ishimbayneft-pumps with a landing group (0.03–0.06). When repairing a pump, one can choose a landing group (plunger-cylinder), which will increase the service life of a sucker rod pump that has previously worked out its service life.
Problem solution of optimal pathfinding for the movement of vehicles over rough mountainous areas
Authors: Zhigalov K , Bataev D K-S , Klochkova E , Svirbutovich O A , Ivashchenko G A 
Published: March 2021

Abstract
In recent years, a large number of studies were carried out in the field of finding and constructing the optimal path of movement. However, the task remains relevant due to the emergence of new aspects in this problem. The paper discusses and describes the existing algorithms for finding the shortest path on the graph. The material can be useful in building navigation systems and automated control in terms of the choice of optimal path.
Liable Bluetooth tracking technology for enhancement of location-based services
Authors: Daudov I M , Gavrilova Zh L , Kudashkin V A 
Published: March 2021

Abstract
In recent years, user demand for location-based services has become increasingly urgent. Currently, the main internal positioning technologies include UWB (Ultra-Wide Band), RFID (Radio Frequency Identification), ultrasonic and inertial navigation, optical positioning, Wi-Fi, etc. This article briefly discusses the use of Bluetooth beacons for location, indoor navigation and related algorithms.
Improvement of heat transfer of liquid-oil heat exchangers for internal combustion engines
Authors: Prikhodko Iu S , Akhmetshin D A , Bolkov Ya S , Shishkov A N 
Published: March 2021

Abstract
Removing heat from an internal combustion engine is one of the most promising areas for the development of vehicles and heavy vehicles, especially. The article studies the influence of various parameters of the coolant and the parameters of the heat exchanger on the efficiency of heat transfer when removing heat from an internal combustion engine by an oil-liquid heat exchanger. The influence of “diffuser-confusor effect” on flow turbulization is considered. Literature analysis was carried out during the study. It raised such issues as: the issues of the efficiency of heat transfer from liquid to the wall under various conditions of the flow of the medium, the issues of changing the hydraulic regimes depending on the parameters of the medium, the issues of changing the parameters of the medium from the determining and secondary factors of heat transfer. The data on the influence of the temperature of various oils on their viscosity and density are presented. The influence of the state of the refrigerant on the efficiency of heat transfer is generalized. As a result of the analysis, a number of solutions have been proposed to the safe intensification of heat removal from the internal combustion engine. These solutions can be used for efficient oil cooling in diesel engines, mainly in engine design.
Methods for determining endurance limits for welded joints of marine stationary platforms
Authors: Starokon I V 
Published: March 2021

Abstract
Today, oil, gas and other useful resources are being actively extracted at offshore fields using fixed offshore platforms. According to Federal Law No. 116 On Industrial Safety of Hazardous Production Facilities, offshore platforms are classified as hazardous production facilities, accidents at which are accompanied by significant damage. To prevent accidents at these facilities, an industrial safety examination is carried out, during which their resource is determined. The key parameter for determining the resource is the value of the endurance limit (or fatigue limit). Various theories are currently being applied to determine the fatigue limit. However, calculations on these theories give different results. The purpose of this article is to study various methods for determining endurance limits using welded joints of fixed offshore platforms as an example and choosing a method that allows you to obtain the most accurate value of this limit.
Gadolinium-chelate functionalized magnetic CuFeSe2 ternary nanocrystals for T1-T2 dual MRI and CT imaging in vitro and in vivo
Authors: Lai Lu-Yao , Jiang Ying , Su Guang-Ping , Wu Min , Lu Xiao-Fei , Fu Shao-Zhi , Yang Lu , Shu Jian 
Published: March 2021

Abstract
CuFeSe2 nanomaterial with high thermal conversion efficiency, well superparamagnetism, effective x-ray attenuation ability, multifunctional groups and excellent biocompatibility is beneficial to the construction of multimodal imaging probes which can combine various imaging modes to provide a synergistic advantage over a single imaging mode. This study aimed to develop a novel multimodal nanocontrast agent CuFeSe2@diethylenetriaminepentaacetic acid (DTPA)-Gd to obtain imaging information with high specificity, high sensitivity and high contrast. The morphology and physical characteristics of CuFeSe2@DTPA-Gd were detected by transmission electron microscope, scanning electron microscope, x-ray single crystal diffraction, vibrating sample magnetometer and fourier transform infrared spectrometer. The toxicity of CuFeSe2@DTPA-Gd in vivo was evaluated by hematoxylin-eosin staining. The imaging capability of CuFeSe2@DTPA-Gd in vitro and in vivo was evaluated by magnetic resonance imaging (MRI) and computed tomography (CT). This study successfully prepared nanoparticles CuFeSe2@DTPA-Gd, and experimental results in this study demonstrated CuFeSe2@DTPA-Gd is expected to be a useful CT and MRI T1-weighted imaging/T2-weighted imaging three-modal contrast agent in clinic.
A method for controlling the magnetic field near a superconducting boundary in the ARIADNE axion experiment
Authors: Fosbinder-Elkins H , Kim Y , Dargert J , Harkness M , Geraci A A , Levenson-Falk E , Mumford S , Fang A , Kapitulnik A , Matlashov A , Kim D , Shin Y , Semertzidis Y K , Lee Y-H , Aggarwal N , Lohmeyer C , Reid A , Shortino J , Lee I , Long J C , Liu C-Y , Snow W 
Published: March 2021

Abstract
The QCD axion is a particle postulated to exist since the 1970s to explain the strong-CP problem in particle physics. It could also account for all of the observed dark matter in the Universe. The axion resonant interaction detection experiment (ARIADNE) intends to detect the QCD axion by sensing the fictitious ‘magnetic field’ created by its coupling to spin. Short-range axion-mediated interactions can occur between a sample of laser-polarized 3He nuclear spins and an unpolarized source-mass sprocket. The experiment must be sensitive to magnetic fields below the 10−19 T level to achieve its design sensitivity, necessitating tight control of the experiment’s magnetic environment. We describe a method for controlling three aspects of that environment which would otherwise limit the experimental sensitivity. Firstly, a system of superconducting magnetic shielding is described to screen ordinary magnetic noise from the sample volume at the 108 level, which should be sufficient to reduce the contribution of Johnson noise in the sprocket-shaped source mass, expected to be at the 10−12 T

/

H
z

level, to below the threshold for signal detection. Secondly, a method for reducing magnetic field gradients within the sample up to 102 times is described, using a simple and cost-effective design geometry. Thirdly, a novel coil design is introduced which allows the generation of fields similar to those produced by Helmholtz coils in regions directly abutting superconducting boundaries. This method allows the nuclear Larmor frequency of the sample to be tuned to match the axion field modulation frequency set by the sprocket rotation. Finally, we experimentally investigate the magnetic shielding factor of sputtered thin-film superconducting niobium on quartz substrates for various geometries and film thicknesses relevant for the ARIADNE axion experiment using SQUID magnetometry. The methods may be generally useful for magnetic field control near superconducting boundaries in other experiments where similar considerations apply.
Multi-physics design optimization of structural battery
Authors: Pejman Reza , Kumbur Emin Caglan , Najafi Ahmad Raeisi 
Published: March 2021

Abstract
Structural battery composite is a new class of multifunctional lightweight materials with profound potential in harvesting electrical energy in the form of chemical energy, while simultaneously providing structural integrity to the system. In this study, we present a multi-physics design optimization framework for structural battery. The objective of the optimization framework is to change the geometrical features and material types of the constituents in a composite lamina to maximize the allowable charging current for a constant rate of charging. In this optimization framework, three sets of inequality constraints are defined to keep the structural battery lightweight, and make sure that the amount of induced stress and generated heat due to the intercalation process remains small. We have also considered several design parameters such as geometrical features of the composite lamina, volume fractions of fibers and LiFePO4 particles, and material types of constituents. The proposed framework includes a gradient-based design optimization method with the ability to perform the optimization process under any source of uncertainty in the material properties, manufacturing process, operating conditions, etc. It also contains a Bayesian design optimization scheme to select the best candidate for the materials of the constituents in a structural battery. We also develop an analytical sensitivity analysis of several electrochemical/thermal/structural response metrics with respect to a few geometrical and material design parameters of a composite lamina. The results show that by using the proposed optimization framework, we are able to maximize the allowable charging current for a constant rate of charging in the optimized solution compared to the considered reference designs while satisfying all of the prescribed constraints. Furthermore, we increase the design reliability of structural battery by at least 45% compared to the deterministic optimized solution. Finally, we find the optimized material types for the fiber and matrix in a structural battery.
Energy distribution of radial solutions to energy subcritical wave equation with an application on scattering theory
Authors: Shen Ruipeng 
Published: March 2021

The topic of this paper is a semi-linear, energy subcritical, defocusing wave equation

∂
t
2

u
−
Δ
u
=
−

|

u

|

p
−
1

u

\partial _t^2 u - \Delta u = - |u|^{p -1} u

in the 3-dimensional space (

3
≤
p
>
5

3\leq p>5

) whose initial data are radial and come with a finite energy. We split the energy into inward and outward energies, then apply the energy flux formula to obtain the following asymptotic distribution of energy: Unless the solution scatters, its energy can be divided into two parts: “scattering energy”, which concentrates around the light cone

|

x

|

=

|

t

|

|x|=|t|

and moves to infinity at the light speed, and “retarded energy”, which is at a distance of at least

|

t

|

β

|t|^\beta

behind when

|

t

|

|t|

is large. Here

β
\beta

is an arbitrary constant smaller than

β
0

(
p
)
=

2
(
p
−
2
)

p
+
1

\beta _0(p) = \frac {2(p-2)}{p+1}

. A combination of this property with a more detailed version of the classic Morawetz estimate gives a scattering result under a weaker assumption on initial data

(

u
0

,

u
1

)

(u_0,u_1)

than previously known results. More precisely, we assume
\[

∫

R

3

(

|

x

|

κ

+
1
)

(

1
2

|

∇

u
0

|

2

+

1
2

|

u
1

|

2

+

1

p
+
1

|

u

|

p
+
1

)

d
x
>
+
∞
.

\int _{\mathbb {R}^3} (|x|^\kappa +1)\left (\frac {1}{2}|\nabla u_0|^2 + \frac {1}{2}|u_1|^2+\frac {1}{p+1}|u|^{p+1}\right ) dx > +\infty .

\]
Here

κ
>

κ
0

(
p
)
=
1
−

β
0

(
p
)
=

5
−
p

p
+
1

\kappa >\kappa _0(p) =1-\beta _0(p) = \frac {5-p}{p+1}

is a constant. This condition is so weak that the initial data may be outside the critical Sobolev space of this equation. This phenomenon is not covered by previously known scattering theory, as far as the author knows.
Development of a Typology of Diabetes-Specific Family Functioning Among Adults With Type 2
Authors: Mayberry Lindsay S , Greevy Robert A , Huang Li-Ching , Zhao Shilin , Berg Cynthia A 
Published: March 2021

Abstract

Background
Family members’ responses to adults’ diabetes and efforts to manage it vary widely. Multiple aspects of diabetes-specific family functioning have been identified as important for self-management and psychosocial well-being in theoretical (i.e., theories of social support and collaborative coping) and observational literature.

Purpose
Develop a typological framework of diabetes-specific family functioning and examine cross-sectional associations between type and diabetes outcomes.

Methods
We used electronic health record (EHR) data to identify a cohort of 5,545 adults receiving outpatient care for type 2 diabetes and invited them to complete a survey assessing 10 dimensions of diabetes-specific family functioning. We used k-means cluster analysis to identify types. After type assignment, we used EHR data for the full cohort to generate sampling weights to correct for imbalance between participants and non-participants. We used weighted data to examine unadjusted associations between participant characteristics and type, and in regression models to examine associations between type and diabetes outcomes. Regression models were adjusted for sociodemographics, diabetes duration, and insulin status.

Results
We identified and named four types: Collaborative and Helpful (33.8%), Satisfied with Low Involvement (22.2%), Want More Involvement (29.6%), and Critically Involved (14.5%; reflecting the highest levels of criticism and harmful involvement). Across these types, hemoglobin A1c, diabetes distress, depressive symptoms, diabetes medication adherence, and diabetes self-efficacy worsened. After covariate adjustment, type remained independently associated with each diabetes outcome (all p’s &lt; .05).

Conclusions
The typology extends theories of family support in diabetes and applications of the typology may lead to breakthroughs in intervention design, tailoring, and evaluation.
Gender Affirmation as a Source of Resilience for Addressing Stigmatizing Healthcare Experiences of Transgender Youth of Color
Authors: Goldenberg Tamar , Gamarel Kristi E , Reisner Sari L , Jadwin-Cakmak Laura , Harper Gary W 
Published: March 2021

AbstractBackgroundTransgender and other gender diverse (TGD) youth of color experience stigma within healthcare. Gender affirmation can be a resilience resource; however, little is known about gender affirmation within healthcare.PurposeThis study explores TGD youth of color’s experiences of stigma and gender affirmation across the entire healthcare experience and their role on motivation to seek care.MethodsIn 2015, cross-sectional surveys and individual in-depth interviews were conducted among 187 TGD youth ages 16–24 living in 14 U.S. cities. Analyses followed a mixed-methods design whereby 33 participants were purposively selected for a qualitative phenomenological analysis based on quantitatively reported gender affirmation needs. Subsequent quantitative analyses examined how healthcare use differed by access to gender affirmation.ResultsParticipants qualitatively described experiencing stigma across multiple healthcare settings (e.g., primary care, emergency care, medical gender affirmation), including before (finding providers, scheduling), during (waiting rooms, provider interactions), and after (pharmacy) healthcare visits. Participants who quantitatively reported access to gender-affirming healthcare still described negative healthcare experiences, either because they accessed multiple healthcare services or because of prior negative experiences. Stigma and gender affirmation (both inside and outside of healthcare) influenced motivation to seek care, with variation depending on the type of care. Quantitative analyses confirmed these findings; access to gender affirmation differed for participants who delayed primary care vs. those who did not, but did not vary based on participants’ use of medical gender affirmation.ConclusionsFindings highlight the importance of promoting gender-affirming healthcare environments to increase access to care for TGD youth of color.