bluuebunny/crossref_metadata_2025_split huggingface dataset:
Brand Image and Product Quality Against Purchase Decision: Sariayu hijab shampoo competitive environment
Authors: Ida Zuraidah , Hidayati Ida Nur 
Published: April 2020

Abstract
In general, this study aims to analyze the influence of brand image and product quality to the purchase decision of Sariayu Hijab shampoo on Syari’ah Economics coedclass of 2014 STAIN Kediri. The population in this study is coedclass of 2014 Syari’ah Economics STAIN Kediri using Sariayu Hijab shampoo. The number of samples determined by 105 respondents by using random sampling method. Data analysis method used is multiple linear regression analysis. The result of analysis stated that brand image and product quality significantly influence the decision of purchasing Sariayu Hijab shampoo on Syari’ah Economics coedclass of 2014 STAIN Kediri. While the determination coefficient is 0,405, it means 40,5% purchase decision can be explained by brand image and quality product.
The Development of the Politics of Law in Indonesia’s Sharia Economic Environment
Authors: Renie Elsy , Luth Thohir , Sihabbudin  , Hamidah Siti 
Published: April 2020

Abstract
The sharia economic law in Indonesia applies in non-formal term as the part of the law that lives in community and in juridical formal term. The non-formal term of sharia economic law can be actualized in the form of fiqh mu’amalah iqtishadiyah or DSN MUI fatwa while the juridical formal term must be actualized in the form of the enactment of laws and regulations whose formulation is carried by the authorized government agency. In turn, the accommodation of Mu’amalah principles brings out the politics of law of sharia economy. This research is a normative legal research. The object of a normative legal research is the law that conceptualized as a norm or rule. There are several norms that becoming the objects in this study, including laws, government ordinances, etc. This research uses historical approach and statute approach. The result of this research shows that the sharia economic law in Indonesia has a specific type. Recognition process of the sharia economic law has a different recognition than another Islamic laws. Fatwa DSN MUI has strong legitimation in laws related to sharia economic. This is a concrete manifestation that the state supporting the development of Islamic economic in Indonesia.
The use of various types of circulation in the design of excavator hydraulic drive
Authors: Myrzakhmetov A , Akinfiev A 
Published: April 2020

Abstract
This article is devoted to the review, study and analysis of the existing types of circulation used in the design of hydraulic drives of construction machines. Three main types of circulation are distinguished: closed, open, and semi-closed. A comparison is given and the characteristic features of each of them are described. Particular attention is paid to semi-closed circulation because it is under investigated. The sequence of movements of the equipment elements during the work cycle is shown. The results are presented, in the form of a diagram of flow rates in the actuators of an excavator planner, made by semi-closed circulation. This work will be of interest to specialists in the field of designing volumetric hydraulic drives of construction vehicles.
Research of the dependence of the hydraulic friction coefficient of the liquid (λ) on the reinolds number (Re) applicable to the hydraulic drive
Authors: Nikolskiy V , Makarov K 
Published: April 2020

Annotation
Experimental studies of the dependence of the coefficient of hydraulic friction λ on the Reynolds number Re at the stand “Hydraulics” in relation to the hydraulic drive. The formula for determining the coefficient of hydraulic friction for a turbulent regime of fluid motion is refined. Based on the results of studies, a graph of the dependence of the coefficient of hydraulic friction λ on the Reynolds number Re with an analysis of the four zones of this dependence is constructed.
The effect of the throttles diameter installed on the auxiliary channel on the flow rate of the fluid flowing through them and the heating of the fluid in the magnetic field
Authors: Pavlovskiy D , Protopopov A , Isaev N 
Published: April 2020

Abstract
This article discusses the effect of the diameters of the throttles installed in the auxiliary paths on the flow rate of the fluid flowing through them and the heating of the fluid in the area of the magnetic coupling. The simulation was carried out in the STAR-CCM+ package.
Investigation of the influence of the front end clearance on the parameters of a centrifugal pump with an open type impeller
Authors: Kalinkin S , Petrov A 
Published: April 2020

Abstract
The paper considers the influence of the size of the front end gap between the impeller and the housing on the energy performance of the pump, selects the parameters, compiles a mathematical model used in hydrodynamic modeling, presents the results of the study, draws conclusions about the influence of the size of the front gap between impeller and housing on efficiency and pump head. A comparison is made of the dimensionless pump characteristics obtained by the methods of hydrodynamic modeling with experimental dependences.
Determination of the coefficient of economic efficiency of frequency regulator
Authors: Protopopov A , Makhlaeva A , Panya A 
Published: April 2020

Abstract
The work is devoted to the finding of the formula for calculating economic efficiency of the frequency control method. This method is considered on the example of vertical tank drainage. Also in this work the principle of operation of the frequency controller and its application are described. The figuring out of the formula is based on the expression for calculating efficiency and this system capacity, depending on pump volume flow rate.
Development of hydraulic transmission for implementing an active drive of the landing gear wheels of modern transport aircraft
Authors: Brusov V , Menshikov A , Merzlikin Y 
Published: April 2020

Annotation
An active drive of the wheels of the chassis is necessary on the take-off and run with reduced coupling characteristics of the airplane on an unpaved or icy runway in crosswind conditions to reduce lateral drift from the axis of the strip. The hydraulic transmission has been developed for the active drive of the wheels by aircraft chassis. At using a control system, that regulates the moment wheels characteristics and includes an adaptive circuit with neural network, it is possible to reduce the lateral drift of the aircraft about 30–40 %. The output parameters of the hydraulic motors intended for the landing gear wheels of aircraft weighting 21 tons are determined.
Study of an inducer and axial vortex stage
Authors: Ankudinov A , Klimenko D , Timushev S , Regeda A 
Published: April 2020

Abstract
Increasing the intake capacity and reducing vibration loads of high-speed pumps is an important task in the development of power systems in the aerospace industry, as well as in the application of such pumps in the energy and oil production sectors. With an improvement in cavitation qualities, pumps can operate at a higher shaft speed, and at a given shaft speed, with lower net positive suction head, that is, at reduced inlet pressure. With increasing shaft speed, the dimensions and weight of the pumps decrease. To increase the cavitation qualities of the pumps, an axial vortex stage (AVS), which is an object of comparison with the inducer, is considered as an upstream device. It is necessary to study the fact of pressure pulsations decrease when using the AVS. The results obtained with computational fluid dynamics to analyze pressure pulsations in the inducer and in the AVS are used in this article.
Research of the relay-linear control of an electro-hydraulic servo drive on FESTO learning system
Authors: Kulakov B , Kulakov D 
Published: April 2020

Abstract
The task of a relay-linear control algorithm for an electro-hydraulic servo drive (EHSD) was considered. This algorithm provides reconfiguration of the state components feedback coefficients at the very initial stage of the control object movement, when the optimized control action does not depend on these coefficients. A FESTO hydraulic learning system combined with Matlab+Simulink Desktop Real Time was used for realization of the developed algorithm. Experimental results are included.
Famous trumpet effects
Authors: Kochetkov Yu , Kravchik T , Protopopov A 
Published: April 2020

Annotation
An analytical review of the effects obtained in the course of studies of flows in pipes is presented. There are descriptions of the famous experiments of Reynolds, who put on the agenda the problem of turbulence. The description and analysis of the discovery of Taylor vortices, which gave the received stimulus to the development of spatial hydro-gas dynamics, is given. The original invention of the Shebeko gas-dynamic tube, which allowed solving the problem of high-altitude testing of the Burya rocket, is presented. The original experiments with the thermal acoustic effect of Riike and Bossch — Riess are described, which stimulate new views on the stability of processes in the future. The invention of Gershman, which gave a practical impetus to the use of resonators in technology, is described. The description of the Rank — Hilsh pipe is given, the effect of which is widely used in the chemical and oil industry. The effect of a heat pipe used in industry for space heating is described.
Mathematical modeling of a hydraulic drive for leveling the support table of a robotic drilling platform
Authors: Kolotvin E 
Published: April 2020

Abstract
The principle of moving a hydraulic drilling platform is described. To study the dynamics of transient response processes of hydraulic drive for leveling, a mathematical model was created. The structural diagrams of mathematical models of the actuator and hydraulic control valve are given. The time dependences of the spool positions of the hydraulic control valve and the hydraulic cylinder rod are presented. The dependences of pressure changes in the rod and piston cavities of the hydraulic cylinder are presented.
The calculation of multiphase flows in flowing parts of centrifugal pump
Authors: Saprykina M , Lomakin V 
Published: April 2020

Abstract
The effect of gas content on the changing of head of a centrifugal pump is researched. The method of numerical hydrodynamic modeling is used for solving this problem. The using mathematical models are described and compared. The results of the simulation of fluid flow, which are depended on the air content, are presented. The data on the changing of head and the termination of its work are obtained.
Analytical study of the dynamics of a pumping unit, consisting of a fixed pump and a flow rate regulator
Authors: Lepeshkin A , Sarach E 
Published: April 2020

Abstract
A mathematical model of a pumping unit, consisting of a fixed pump and an automatic flow rate regulator, intended for use as part of a mathematical model of a volume hydraulic drive that requires a constant supply pressure for its operation is described in article. As the carried out studies showed (their results are given in this article), the proposed model describes the physical processes during the operation of the pump unit quite well. In addition, based on these studies, recommendations are given on the need to include a hydropneumatic accumulator in the structure of the unit, which will significantly improve its dynamic characteristics.
Development and application of vortex control valves in pneumahydraulic systems
Authors: Uss A , Pugachuk A , Chernyshov A 
Published: April 2020

Annotation
The current state of the development and study of vortex jet devices that are used as control valves based on the working medium vortex flow principle is reviewed and analyzed in the article. The scientific and technical literature is reviewed. The article considers vortex valves without mechanically moving parts, as well as a semi-mechanical vortex valve. The principle of operation of a vortex jet device is described. The rationale of the use of a vortex jet device as an actuator in a valve for controlling the flow of a working medium, as well as in a control system of a sleeve-valve cylinder, is given. The classification of vortex jet devices by the feed type of the supply and control flows of the working medium is carried out for the first time.
Conceptual features for improving the flow part of the multiphase stages of ESP submersible plants for small and medium feeds for extracting stratal liquid with a high free gas content
Authors: Trulev A , Kayuda M , Timushev S , Lomakin V 
Published: April 2020

Annotation
This article analyzes the operation numerical simulation for serial and multiphase stages of various manufacturers on water and gas-liquid mixtures (GLM). Are identified the local gas separation areas in serial stages, which can lead to the formation of gas plugs and disruption of the pump supply.
These factors include: the creation of a finely dispersed flow structure at the entrance of the stage, the preservation along the flow with small free gas bubbles diameters, the sustenance of the value for the allowed free gas content by circulation means of fluid part in the impeller, a defined relationship between the pressure gradient and the GLM flow rate. A mathematical model is selected, hydrodynamic calculations of structural options, optimization are carried out, a conceptual option is selected. Bench tests were carried out, confirming the high parameters of the product when working on GLM.
Application of optimization algorithms to improve the vibroacoustic characteristics of pumps
Authors: Lomakin V , Valiev T , Chaburko P 
Published: April 2020

Abstract
The article describes an attempt to optimize the flow part of the centrifugal pump by vibroacoustic characteristics, suggests a method of evaluation of these properties by methods of hydrodynamic modeling based on the analysis of force pulsations and moments acting on the rotor and stator of the flow part. The obtained data are decomposed into a spectrum by the Fourier method and presented in the form of dependence of sound pressure level on frequency. By results of optimization, the model with the best vibroacoustic characteristics within the limits of numerical modeling is found.
Experimental study of cavitation resistance of restoring coatings
Authors: Aksenova E , Lomakin V , Cheremushkin V 
Published: April 2020

Annotation
The article presents the results of an experimental study of the resistance of various metallic and nonmetallic coatings to cavitation failure. The method of accelerated cavitation resistance tests using an ultrasonic emitter is described. Comparative characteristics of the resistance of materials are given.
Optimization of parameters of the pressure regulator with variable characteristic
Authors: Kolodin I 
Published: April 2020

Abstract
When designing a variable capacity pressure regulator, it is necessary to select parameters that meet certain criteria. In this article optimization of regulator parameters by LPτ search method is considered. The mathematical model of the regulator is made, a possible set of quality criteria is given, dependent criteria are established and the majority of approximate effective points are found. Setting of criteria restrictions is performed in the dialog mode. The methods described in the article allow to obtain an optimal design of the pressure regulator with variable characteristic.
Investigation of the influence of the angle of the installation of the blades of the impeller of the regenerative pump on its energy characteristics by the methods of hydrodynamic modeling
Authors: Petrov A , Isaev N , Radchenko S 
Published: April 2020

Annotation
This paper focuses on the study of the influence of the vortex stage impeller blades angle installation in a centrifugal vortex pump. The mathematical model used in the numerical modeling is described. The 3 variants models of working regenerative impeller with different installation angles are considered. The paper shows the influence of the angle of the blades on the energy characteristics. The evaluation criteria were pressure, hydraulic efficiency and manufacturability. The results obtained during hydrodynamic modeling are presented in the form of velocity distribution vector fields. This paper will be of interest to specialists in the field of designing vortex hydraulic machines.
Assessment of the level of influence of various geometrical parameters of the centrifugal pump guide vane on its energy characteristics
Authors: Petrov A , Lysenko A , Konkeev E , Konshin D 
Published: April 2020

Abstract
The article is devoted to the research of the influence of geometrical parameters of the inlet section of the multistage pump radial channel guide device on its hydraulic efficiency. The obtained values of hydraulic efficiency, considered depending on the geometrical parameters of the guide device, are given. The efficiency parameters were obtained via hydrodynamic modeling. Recommendations on the optimal geometric parameters are offered and compared with already known semi-empirical formulas.
Effect of excitation coil voltage on TiAlSiN coating on 42CrMo steel surface
Authors: Suge Meng , Baolin Zhu , Zhefeng Zhuang , Xiangwen Chen , Cuiyong Tang 
Published: April 2020

Abstract
TiAlSiN coating was painted on the surface of 42CrMo steel by arc ion plating technology, and the influence of excitation coil voltage on the structure and friction property of the coating were analyzed. Results showed that there were a lot of holes on TiAlSiN coatings under different voltages. With the increase of voltage, the structure and friction property changed a lot: the roughness and thickness of the coating increased obviously and all layers were in a state of tight bond and formed a columnar structure; many voids appeared led to the decrease of coating density; the coating with higher microhardness was obtained, which was higher than that of alloy steel substrate; the friction coefficient and wear rate of the coating first decreased then increased, and the minimum wear rate occurred when the voltage reached 30 V, under condition of which the coating mainly suffered from abrasive wear, so more flat surface and denser structure of the coating formed, which significantly improved the wear resistance.
SHOGUN: a modular, accurate and scalable framework for microbiome quantification
Authors: Hillmann Benjamin , Al-Ghalith Gabriel A , Shields-Cutler Robin R , Zhu Qiyun , Knight Rob , Knights Dan 
Published: April 2020

Abstract

Summary
The software pipeline SHOGUN profiles known taxonomic and gene abundances of short-read shotgun metagenomics sequencing data. The pipeline is scalable, modular and flexible. Data analysis and transformation steps can be run individually or together in an automated workflow. Users can easily create new reference databases and can select one of three DNA alignment tools, ranging from ultra-fast low-RAM k-mer-based database search to fully exhaustive gapped DNA alignment, to best fit their analysis needs and computational resources. The pipeline includes an implementation of a published method for taxonomy assignment disambiguation with empirical Bayesian redistribution. The software is installable via the conda resource management framework, has plugins for the QIIME2 and QIITA packages and produces both taxonomy and gene abundance profile tables with a single command, thus promoting convenient and reproducible metagenomics research.

Availability and implementation
https://github.com/knights-lab/SHOGUN.
The structural connectivity of subthalamic deep brain stimulation correlates with impulsivity in Parkinson’s disease
Authors: Mosley Philip E , Paliwal Saee , Robinson Katherine , Coyne Terry , Silburn Peter , Tittgemeyer Marc , Stephan Klaas E , Perry Alistair , Breakspear Michael 
Published: April 2020

AbstractSubthalamic deep brain stimulation (STN-DBS) for Parkinson’s disease treats motor symptoms and improves quality of life, but can be complicated by adverse neuropsychiatric side-effects, including impulsivity. Several clinically important questions remain unclear: can ‘at-risk’ patients be identified prior to DBS; do neuropsychiatric symptoms relate to the distribution of the stimulation field; and which brain networks are responsible for the evolution of these symptoms? Using a comprehensive neuropsychiatric battery and a virtual casino to assess impulsive behaviour in a naturalistic fashion, 55 patients with Parkinson’s disease (19 females, mean age 62, mean Hoehn and Yahr stage 2.6) were assessed prior to STN-DBS and 3 months postoperatively. Reward evaluation and response inhibition networks were reconstructed with probabilistic tractography using the participant-specific subthalamic volume of activated tissue as a seed. We found that greater connectivity of the stimulation site with these frontostriatal networks was related to greater postoperative impulsiveness and disinhibition as assessed by the neuropsychiatric instruments. Larger bet sizes in the virtual casino postoperatively were associated with greater connectivity of the stimulation site with right and left orbitofrontal cortex, right ventromedial prefrontal cortex and left ventral striatum. For all assessments, the baseline connectivity of reward evaluation and response inhibition networks prior to STN-DBS was not associated with postoperative impulsivity; rather, these relationships were only observed when the stimulation field was incorporated. This suggests that the site and distribution of stimulation is a more important determinant of postoperative neuropsychiatric outcomes than preoperative brain structure and that stimulation acts to mediate impulsivity through differential recruitment of frontostriatal networks. Notably, a distinction could be made amongst participants with clinically-significant, harmful changes in mood and behaviour attributable to DBS, based upon an analysis of connectivity and its relationship with gambling behaviour. Additional analyses suggested that this distinction may be mediated by the differential involvement of fibres connecting ventromedial subthalamic nucleus and orbitofrontal cortex. These findings identify a mechanistic substrate of neuropsychiatric impairment after STN-DBS and suggest that tractography could be used to predict the incidence of adverse neuropsychiatric effects. Clinically, these results highlight the importance of accurate electrode placement and careful stimulation titration in the prevention of neuropsychiatric side-effects after STN-DBS.
Union Density Effects on Productivity and Wages
Authors: Barth Erling , Bryson Alex , Dale-Olsen Harald 
Published: April 2020

AbstractWe exploit changes in tax subsidies for union members in Norway to identify the effects of changes in firm-level union density on productivity and wages. Increased deductions in taxable income for union members led to higher membership rates and contributed to a lower decline in union membership rates over time in Norway. Accounting for selection effects and the potential endogeneity of unionisation, the results show that increasing union density at the firm level leads to a substantial increase in both productivity and wages. The wage effect is larger in more productive firms, consistent with rent-sharing models.