Installation Options Research Articles

Investigating the determinants of consumer confidence and online impulse buying intentions: an experimental study

PurposeThis study examines the effects of risk reduction, seller reputation, eWOM and warranties on consumer confidence and online impulse buying intentions through the lens of the stimulus-organism-response (SOR) model. It also explores the role of installment options in online impulse buying.Design/methodology/approachWe performed a between-subjects experiment (installment vs. no-installment option). Data were collected from 199 consumers and analyzed using SmartPLS 3.3.9.FindingsThe results show that risk reduction, eWOM and warranty positively affect consumer confidence (CC) in online shopping and that CC positively predicts online impulse buying intentions. It was also found that the effect of CC on online impulse buying intentions was stronger when consumers were offered an installment option than a no-installment option.Practical implicationsFindings suggest that online sellers should invest more resources in building consumer confidence, which affects online impulse buying intentions. Moreover, online sellers should offer installment options to consumers, thereby reaping stronger effects of consumer confidence on online impulse buying intentions.Originality/valueEmploying the experimental approach, this study makes a novel attempt to examine the role of the installment option in fostering online impulse buying intentions among Pakistani consumers. Likewise, this is one of the early studies to explore the effects of risk reduction, seller reputation, eWOM and warranties on CC among Pakistani consumers using the SOR model.

Rapid diagnosis of proportional valve pilot stage stiction fault via dynamic model-based temporal features

As the key flow control elements in modern mechatronic systems, electrohydraulic proportional valves determine the total system operating status. Due to effects such as mechanical wear, micro scale particles may accumulate in the oil and eventually cause stiction in the valve spool. Therefore, early prognosis of valve faults via spool displacement sensing is critical for efficient and economical operations. However, the spool stiction is difficult to measure due to the fully enclosed design of valves, excluding the possible sensor installation options. Traditionally, the sensor-less fault diagnosis is done by machine learning to classify the features extracted using frequency domain methods, which can be time consuming and the trained model is computationally too heavy for the onboard controller. In this paper, a light-weight spool stiction diagnosis method is proposed, where time-series features extracted from coil current signals as well as spool dynamics can be used to quantitively determine the stiction severeness. A hardware-in-the-loop test bed is designed to perform valve spool stiction simulating experiments, and a piloted operated solenoid proportional valve is selected as the validation target. A three-layer regression neural network is established as the baseline. Initial results show the proposed model can detect spool stiction at various degrees, which accuracies are on par with the baseline neural network but nearly three orders of magnitude faster.

Research on bearing capacity and stability of deep-water novel combined wellhead based on experimental methods

The combined wellhead has the advantage of high bearing capacity and broad prospects for application in the construction of deep water surface wells; therefore, it is important to conduct relevant research to guide the construction of combined wellheads. The aim of this paper is to study the mechanical characteristics of the combined wellhead in the longitudinal direction and establish the method for real-time calculation of the bearing capacity of the combined wellhead taking into account the effects of installation. The variations of external wall pressure and internal soil pressure during installation and the waiting process of the combined wellhead were investigated by indoor experiments. The installation efficiency of the combined wellhead at different negative pressure conditions was also compared. The experimental results show that the pressure on the outer wall of the combined wellhead facility gradually increases as the depth of the combined wellhead facility increases, and the closer it is to the bottom, the greater the soil pressure. The pressure on the inner soil will increase rapidly during the installation process to almost the same level, while the pressure on the outer soil will increase slightly. During the waiting process of the combined wellhead, as the waiting time increases, the soil damaged during the installation process gradually recovers, and the external wall pressure gradually rises. Moreover, the pressure on the outer wall gradually increases, the pressure on the inner soil decreases slightly leveling off within about 24 h. An appropriate increase in suction pressure facilitates the installation of the combined wellhead, and approximately 2.0 L/min is the optimal option for installation. The computational model developed in this paper and the experimental measurements corroborate each other. These combined wellheads significantly improve the stability of deep water soft-soil well construction and provide a theoretical benchmark for developing oil, gas and hydration in deep water.

Markov chains for modeling and pricing installment options in financial markets

Markov chains for modeling and pricing installment options in financial markets

Convenient Site Selection of a Floating PV Power Plant in Türkiye by using GIS-Fuzzy Analytical Hierarchy Process.

Floating photovoltaics (FPVs) are appearing as a promising and an alternative renewable energy opinion in which PV panels are mounted on floating platforms in order to produce electricity from renewable energy on water such as seas, dams, rivers, oceans, canals, fish farms, and reservoirs. So far, such studies related to the body knowledge on financial, technical, and environmental aspects of installation of FPV have not been performed in Turkey while expanding steadily in other countries. In this study, suitable site selection for installation of FPV power plants on three lakes in Turkey was studied by performing geographic information system (GIS) and the fuzzy analytic hierarchy process (FAHP) as multi-criteria decision-making (MCDM) method. This detailed study revealed that the criterion of global horizontal irradiance (GHI) was determined as the most crucial criterion for the installation of FPV on Beysehir Lake, Lake of Tuz, and Van Lake. Additionally, it was clearly seen that the Beysehir Lake had the highest value approximately 52% among other lakes for installation, that is why Beysehir Lake is selected as the best option for installation of an FPV system with this multi-criteria approach.

Sound absorption properties of the metamaterial curved microperforated panel

This paper proposes a metamaterial that utilizes resonators to enhance the sound absorption capacity of the curved microperforated panel (CMPP), and reliable theoretical analyses and experimental verification are comprehensively given. A metamaterial curved microperforated panel (MCMPP) absorber is formed by attaching local resonators on the CMPP. The displacements of the midplane of the curved panel are expanded into the improved Fourier series based on Spectral-Geometry Method (SGM), and the vibration equations of the MCMPP are derived by the Rayleigh-Ritz method. The sound absorption characteristics of the MCMPP are solved by the effective medium method and the acoustic-electric analogy method. Both a structure-acoustic coupling simulation model and an impedance tube test system are established to validate the accuracy of the present theoretical model. The essential parametric analyses are carried out in conjunction with mode splitting and acoustic-vibrational coupling, and the results show that the local resonance absorption peak within 1000 Hz increases from 1 to 5 with the absorption coefficients greater than 0.8 at these peaks under the installation options of the periodic gradient array and multiple resonances, realizing the effective absorption in multiple frequency bands. This paper provides theoretical support and experimental protocols for the design and application of the metamaterial curved microperforated panel.

Обзор факторов, воздействующих на оптоволоконные линии связи при грозовых разрядах, и моделирование лабораторных установок, предназначенных для изучения влияния магнитного поля на параметры оптоволокна

The article provides an overview of the known effects that influence the transmission of information over optical fiber and that arise as a result of lightning discharges: the electro-optical Kerr effect, the Faraday effect, the influence of ionizing radiation. It is indicated that there is preliminary empirical data according to which the magnetic field changes such an optical fiber parameter as attenuation. In order to verify these preliminary empirical data, further experimental studies of the supposed influence of the magnetic field on attenuation are proposed, for which it is necessary to build a laboratory installation. This article is also devoted to a comparison of various options for laboratory installations and the preliminary selection of a parameter for comparison. As a result of modeling two options for a laboratory installation and comparing them according to the accepted parameter, one of two installation options is selected.

Technological Installation Drawings of Roof Construction and Suspended Ceilings Using Combined Method

The article describes various installation schemes for roofing structures and suspended ceilings using combined method for industrial buildings. The article inspects three installation options for assembling building elements: transversal motion of the crane across spans, working motion of the crane across the spans with idle returns, and installation spanwise. The advantages and disadvantages of each mounting option are also discussed. The article describes in detail methods of installing structural elements of a building, which allows the work to be completed with minimal labor costs. Schemes for installing coating structures and suspended ceilings using combined method are also considered.

Influences of Yaw characteristics on the performance of an Archimedes screw hydrokinetic turbine

A system for in situ power generation that exploits deep-sea current energy has been developed to meet the electricity demands of deep-sea observational equipment. The Archimedes screw hydrokinetic turbine (ASHT) is notable for its self-starting capabilities and energy efficiency, making it well suited for deployment in the low-speed deep-sea environment. This study elucidates two distinctive hydrodynamic characteristics of ASHT and explicates the underlying operational principles for the first time. Specifically, the ASHT is capable of self-yawing without the need for auxiliary yawing mechanisms and, when fixed, can harness ocean currents from a wide array of directions. Based on these hydrodynamic characteristics, passive yaw and fixed installation methods are proposed. A rigorously validated numerical model, supported by water flume tests, is utilized to illuminate the real-time flow mechanisms and assess the effect of different geometric variables on the ASHT yawing performance. An in-house Simulink model evaluates the power supply capabilities of both installation options, revealing that fixed installations are preferable for locations with varied incoming flow angles, whereas passive yaw installations are more appropriate for sites with a restricted range of incoming flow angles.

Inter-Vendor Intra-Operation in Smart Home using Wi-Fi for Capacious Control and Remote Operation

Abstract: Smart homes have been gaining a lot of momentum lately and people are rushing towards it, because of the ease of control, monitor and security that they offer. Although smart home installation has also become quite easier nowadays, but still pertains to be difficult choice to many, due to the exclusivity of the vendors or the inability of some vendors to support the Zigbee connection. Though Zigbee allows users to assemble their own choice of devices and consumption of low power, as long as the devices support Zigbee interface, but Zigbee still remains sort of unsafe and less capacious (expandable). Inter-vendor Intraoperability using Wi-Fi can provide easier installation and control options to the users and also increase the scalability of the smart homes, allowing the users themselves to choose from the devices that they want to install in their home, and providing them a common platform of control in form of a mobile application, from anywhere wherever the Wi-Fi or mobile internet provided. Also, the data transfer would be more secure and encrypted over Wi-Fi, faster and more expandable, even across the countries. In the project, we explore the interconnection of smart home devices from various vendor together with a Zigbee Bluetooth interface with a mobile application for control, enabling the smart homes more accessible by cost cutting.

Determining the efficiency of installing fixed solar photovoltaic modules and modules with different tracking options

The object of this study is photovoltaic modules in various installation options. The physical model of the Earth's illumination by a parallel flow of solar rays has been refined. The dependence of the cosine of the angle of incidence of the Sun's rays on the angular length of the day, as well as the average annual efficiency of the installation of photovoltaic modules, both fixed and with various tracking options, was determined. Refinement of the physical model implies determining the angle of inclination as the angle between the inclined axis of the Earth and its projection on a vertical plane, perpendicular to the line connecting the centers of the Earth and the Sun. This line passes through the center of the Earth. The concept of the average annual efficiency of the installation of photovoltaic modules is introduced as the annual weighted average value of the cosine of the angle of incidence of solar rays on the plane of the photovoltaic module. Various options for installing photovoltaic modules were analyzed: fixed horizontal on the equator; stationary, installed at an angle to the horizon; one that performs tracking in horizontal (vertical) planes; with full tracking. The efficiency of installing a photovoltaic module at each latitude can be equal to the efficiency of installing this module at the equator, that is, 47.93 % when installing the module at an angle of inclination to the horizon equal to the latitude. Tracking in the vertical plane makes it possible to increase the efficiency of the photovoltaic module installation by up to 50 %. Compared to full tracking, tracking in the horizontal plane at an angle of latitude makes it possible to obtain the efficiency of the installation of the photovoltaic module at the level of 97.93 %. The results could be used as a basis for evaluating the efficiency of the installation of photovoltaic modules at different latitudes with different techniques of their installation, as well as for the subsequent generation of electricity

A Period Energy Method for Demagnetization Detection in Surface Permanent Magnet Motors with Search Coils

Irreversible demagnetization of permanent magnets (PMs) in PM synchronous motors (PMSMs) degrades the performance and efficiency of a machine and its drive system. There are numerous fault diagnosis methods for detecting demagnetization under steady-state conditions. However, only a few works could be found on fault diagnosis under dynamic conditions, whereas the dynamic operation of a motor is a very common scenario, e.g., electric vehicles. The voltage and current signal-based traditional fault detection method is not only affected by the structure of the motor, but it also becomes complicated to extract signals involving fault characteristics. Hence, this paper proposes a search coil-based online method for detecting demagnetization faults in PMSMs under dynamic conditions, which are not affected by the motor structure. To gather the flux of the stator tooth, flexible Printed circuit board (FPCB) search coils are positioned at the stator slot. The search coil is made up of two branches that are one pole apart and arranged in reverse sequence. In this installation option, the output signal in the fault state cannot be eliminated, and the output signal in the health state is zero. This paper defines only that characteristic value related to the position angle of the rotor. Further, the aim was to simultaneously eliminate the influence of elements like the search coil installation error and the inherent dispersion of the permanent magnet on the detection results. To characterize the fault degree, the measurement differential between the health state and the fault state is further integrated according to a predetermined angle range. Last but not least, speed-independent detection of individual permanent magnet demagnetization faults is possible using rotor position and stator tooth flux. A six-phase PMSM was used in experiments to show the efficiency of the suggested approach. The findings of the experiment demonstrate that the suggested strategy may precisely ascertain when a defect will occur.

Wave mode analysis of a turbine guide vane-integrated rotating detonation combustor based on instantaneous frequency identification

Owing to the pressure gain combustion characteristics, the gas turbine can enhance the system thermodynamic cycle efficiency by integrating a rotating detonation combustor (RDC). In this study, an experimental model of a hydrogen/air RDC with a variant installation of turbine guide vanes (TGVs) was developed. A mathematical model was proposed to identify the rotating detonation wave (RDW) propagation direction. The accuracy of the calculated RDW instantaneous velocity was improved, and the range of velocity fluctuations narrowed from 200 to 1700 m s−1 to 800–1600 m s−1. The impact of TGV installation on the rotating detonation characteristics was investigated. Both the RDW frequency and static pressure increased by installing the TGV at the combustor outlet. The propagation direction of the initial detonation wave induced the RDW to propagate along the same direction. TGV installation reduced the discrepancy in the RDW velocity between two opposite directions as well as the propagation direction changing frequency, while the inverse TGV installation achieved better optimization. The high-frequency pressure oscillations attenuated at the downstream of the TGV, and the amplitude varied depending on the TGV installation options. The static pressure decreased by 14%–16% in both TGV installation options when the combustion flow travelled through the TGV.

Machine learning based churn analysis for sellers on the e-commerce marketplace

Abstract The goal of this study is to develop churn models for sellers on the e-commerce marketplace by using machine learning methods. In order to develop these models, three approaches are applied for developing the models. The dataset used in this study includes ten features, which are maturity type, maturity interval, city of the seller, total revenue of the seller, total transaction of the seller, sector type of the seller, business type of the seller, sales channel, installment option and discount type. Random Forest (RF) and Logistic Regression (LR) are used for churn analysis in all of the approaches. In the first approach, models are developed without applying preprocessing operations on the dataset. In the second and third approaches, under sampling and oversampling methods are used respectively to balance the data set. By using stratified cross validation on the dataset, F-Scores of the churn models are obtained. The results show that F-Scores were 0.76, 0.71 and 0.92 for the three approaches developed with RF, and 0.84, 0.68 and 0.69 for the three approaches developed with LR, respectively.

Is E-Trust a Driver of Sustainability? An Assessment of Turkish E-Commerce Sector with an Extended Intuitionistic Fuzzy ORESTE Approach

Due mainly to COVID-19 and the demanding work schedules of many individuals, online purchasing sites have become indispensable. However, the dynamic online environment and everchanging customer demands make sustainable competitiveness challenging for e-commerce platforms. Humans primarily influence the preference for online purchase platforms. This study aimed to discover Türkiye’s top popular online shopping sites by adopting an extended intuitionistic fuzzy ORESTE (Organisation, Rangement Et Synthèse De Données Relationnelles) approach. Our study targeted this by surveying female users of four online shopping platforms using IF-ORESTE. The criteria were determined according to customer preferences. These were as follows: easy accessibility to the platform, providing regular discounts and campaigns, advanced filtering settings, the contractual merchants’ reliability, quick delivery, being more affordable than competing platforms, positive feedback in user comments, having a large brand volume, having an installment option, and having partnered cargo companies. The least important factor was the large volume of brands on the online websites. Quick delivery of orders and positive feedback in reviews were equally important. Similarly, the decision-makers considered regular discounts and promotions and the comprehensive filtering settings as equally critical. However, these criteria were less significant than quick delivery and positive customer feedback. This work’s novelty lies in implementing the IF to the ORESTE in the Turkish e-commerce industry. The implications and future directions are discussed.

청년1인가구의 공공임대주택에 대한 공간개선요구

The supply of an Happy House, a representative public rental housing for young adults, is continuously increasing. As the supply of the Happy House requires the most budget among housing policies for young adults, it is necessary to check whether Happy Housing is suitable for young households, the main beneficiary. Therefore, in this study, a post-occupancy evaluation was conducted targeting young single-person households living in the Happy Houses across the country to identify the demands for housing improvement. The method of this study was an online survey, and a total of 328 responses were collected and analyzed. As a result of the study, the overall improvement demand was slightly above average, and the improvement request for basic installation options such as home appliances, furniture, and facilities was the highest, and the housing area improvement request was similarly high. In the basic installation options, kitchen appliances had the highest demand, and air conditioner installation was also high for each room. The area expansion was mainly in demand for small bedrooms and kitchen/dining rooms. The results of this study can be used as basic data for the preparation of space improvement plans for the Happy House and the establishment of other types of public rental housing supply plans tailored to the young generation.

РАСЧЕТНОЕ ОБОСНОВАНИЕ ТОНКИХ ФУНДАМЕНТНЫХ ПЛИТ ПОД ОБОРУДОВАНИЕ НА ПРИМЕРЕ ДИЗЕЛЬ-ГЕНЕРАТОРНОЙ УСТАНОВКИ.

The presented article contains a summary of the methodology for the numerical calculation of thin foundation slabs for the action of dynamic loads from vibroactive equipment. The considered scheme makes it possible to take into account the vibration isolation and compliance of the supporting structure, the mutual influence of the load application areas on the stress-strain state of the slab. Two installation options are considered - with vibration isolation and without it. The calculation results show that small pieces of the slab account for large overall and heavy vibroactive equipment.

Comprehensive analysis of tropical rooftop PV project: A case study in nanning

Solar photovoltaic (PV) is favored by the market because of its clean and renewable characteristics. There are abundant solar resources in the tropical regions of China. It is important and necessary to carry out comprehensive analysis of rooftop PV projects for tropical regions for scientific policy-makings. Here, we select Nanning as a case study to analyze the optimal options for PV installation on different roof types and estimate the electricity generation potential of rooftop PVs and its additional returns. Our analysis shows that: 1) the annual optimal azimuth and tilt angle in Nanning are 245° and 32.5°, respectively; 2) the tilt angle in southwest orientation has more space for adjustment, while that in the opposite orientation should remain horizontal; 3) for flat roofs, being fixed at the annual optimal angles is practical, while for gable roofs, the east-west direction is favorable; 4) the total potential of rooftop PV projects in Nanning can reach 19.99 TWh/year, resolving 76.1% of the social electricity demand. This research is valuable for rooftop PV installation and optimization in the tropical regions of China, which also could provide reference for other regions.

IMPROVING THE EFFICIENCY OF USING WATER RADIANT HEATING SYSTEMS

Now, the issue of protecting the environment and reducing the use of fossil non-renewable energy sources is becoming increasingly important. For modern heating and air conditioning systems, it is imperative to reduce emissions of harmful substances, especially CO2. This can be realized by significantly reducing the use of fossil non-renewable fuels and reconstructing engineering systems to the current level of energy saving. The annual growth in demand for fossil fuels will be reduced through the optimization of substations and heat distribution devices, which is a necessary step for the development of the country's industry and economy. Therefore, today the main task is to increase the energy efficiency of the use of resources and increase the potential of alternative types of energy in combination with modern low-temperature energy-efficient heat distribution systems, one of which is radiant water panels. The advantages of radiant heating are the absence of dust transfer, since the convective process of mixing air masses is remote, does not require the connection of electrical power, it is possible to work with low-temperature sources of heat supply, no maintenance is required, since there are no fans, electric motors, bearings, lubricants, filters, etc. The main advantage can be distinguished from the use of additional equipment for destratification, as there is no overheating of the upper zones of the heated building. The article presents the results of improving the method of mounting beam-ceiling fixtures with respect to their orientation in space. The results of numerical calculations indicate the efficiency of mounting the equipment at an angle of 45 degrees, which increases the efficiency by 10 % in relation to the 0° orientation. By achieving this mounting and installation option, the required capacity of the heat supply source is reduced and the amount of energy resources used is reduced.

MINIMIZATION OF DEFECT IN THE FORM OF LONGITUDINAL FOLDS AT THE END SECTIONS OF THIN-WALLED SEAMLESS PIPES DURING ROLLING AT AUTOMATIC MILL

During rolling of thin-walled seamless pipes at the rear ends, a defect in the form of end folds occurs, which leads to an increase in the consumption coefficient of the metal. To identify the causes of the formation of this defect, the mathematical modeling of rolling processes in the QForm VX software was carried out. The simulation results showed that the main factor in the formation of end folds at the rear ends of the pipe billets is an increased relative compression along the wall of the pipe billet in the first pass, which leads to flattening of the rear end of the pipe billet and formation of longitudinal folds. To prevent the formation of end folds, it is proposed to install an additional sleeve with a mandrel. As a result of the research, the values of relative compressions were determined, at which a defect is formed for rolling with a new mandrel installation option. It was found that with relative compression along the wall in the first passage from 30.0 %, a defect in the form of folds (“fins”) at the rear end of the pipe billet is formed. With a relative compression of the wall in the first passage up to 39.4 %, the installation of sleeves reduces the formation of “fin” defects at the rear end of the pipe billet; with a relative compression from 39.4 % to 41.8 %, its installation does not prevent the formation of these defects. The optimal distance between the mandrel of the automatic mill and the sleeve is 20–30 mm