bluuebunny/crossref_metadata_2025_split huggingface dataset:
Differences in CD95L Levels and Blood Test Results in Primary and Secondary Dengue Infection Patients
Authors: Nurfadly Nurfadly , Zahara Iqrina Widia , Rahmad Said Munazar 
Published: January 2023

Dengue is a disease caused by dengue virus (DENV) that is transmitted mainly by the female Aedes aegypti mosquito. There are four serotypes of DEN, leading to a possibility that a person may be infected four times by this virus, albeit with different serotypes. Recovery from infection with one viral serotype provides lifelong immunity to the same serotype but not to the other serotypes. Secondary infection by other serotypes increases the risk of developing severe dengue. The pathogenesis of severe dengue involves apoptosis of microvascular endothelial cells that leads to plasma leakage. In addition, there is usually a decrease in platelets and leukocytes and an increase in hematocrit. This study aimed to compare the results of the CD95L examination involved in the apoptotic process and the results of blood tests in primary and secondary dengue patients. This was a cross-sectional study performed in a four months period (September–December 2019) involving several clinics and doctor's private practices in Medan, Indonesia. Subjects were eighty-four dengue patients, consisting of 18 (21%) patients with primary infection and 66 (79%) with secondary infection. Data collected were tested with the Mann Whitney test with p-value of <0.05 considered significant. A significant difference (p value=0.007) was observed in the lymphocyte counts between primary and secondary dengue patients, but no differences were seen in CDL95 level, platelet count, leukocyte count, and hematocrit. In conclusion, except for the lymphocyte count, there is no difference in CD95L level and blood test results between primary and secondary dengue patients.
The assessment of reflector material durability for concentrated solar power based on environment exposure and accelerated aging test
Authors: Suyitno Budhi Muliawan , Rahman Reza Abdu , Sukma Hendri , Rahmalina Dwi 
Published: January 2023

The reflector durability is essential to maintain suitable photo-to-thermal conversion in concentrated solar power plants. The present study evaluates the impact of environmental exposure and accelerated aging of the reflector material. The study is conducted to assess the reflector material's durability to withstand environmental exposure and accelerated aging test. The evaluation is conducted using four different reflector materials commonly used in concentrated solar power: stainless steel and silvered-glass mirror (solid-state reflector), aluminum and silvered-polymer film (sheet-based reflector). The environmental exposure and accelerated aging test are conducted for 1,080 hours according to the standard reference of ISO 8565:2011 and ASTM B117–11. The mass loss after exposure is used as a reference to determine the corrosion rate for each reflector. Further observation is conducted by using microscope light to observe the effect of exposure on the surface of the reflector. Each reflector indicates a different corrosion rate which implies different weather resistance for each reflector type. The highest corrosion rate is found on aluminum film, with a value of 295.8 g/m2.year. The accelerated aging test through neutral salt spray demonstrates that a metallic reflector has a higher corrosion rate compared to a silvered-glass mirror which uses silicon dioxide as the top coating. Microscope observation demonstrates that suitable protection from soiling elements for the silvered-glass mirror is mainly caused by the presence of silicon dioxide on the top surface of this reflector. The assessment suggests that a suitable coating can be developed to be used for reflector protection. Furthermore, the corrosion mechanism is observed clearly, which can be referred to the synthesis of new reflective material that withstands environment and salt exposure.
Development of an information support methodology for quality assessment of the prepress process
Authors: Hrabovskyi Yevhen , Minukhin Sergii , Brynza Natalia 
Published: January 2023

A methodology for improving the information support of the prepress system by introducing new information blocks to prevent errors and predict the final result before the start of prepress operations is presented. Conceptual provisions for assessing the quality of the prepress process have been developed. These conceptual provisions have become the basis for solving the problem of systemic and random errors at the planning stage, created conditions for a significant reduction in prepress time. This parameterized form allows a formal description of operations, the determination of relevant quality indicators based on the formed parameters, and the development of databases and knowledge of the information support system for the anticipatory quality control of prepress.
Classification of factors that affect the quality of the prepress process was carried out. As a result, it is possible to exclude from further consideration the factors that are not important for assessing the prepress quality. The proposed factors form the basis of the knowledge base of the information system for assessing the quality of the prepress process.
The method of “anticipatory” quality control was developed. This method provides the detection of “bottlenecks” in each technological operation of the prepress process, as a result of which random and system errors can be avoided. The resulting indicators of the proposed method are the probability of an error, the probability of error-free execution of the technological operation, the cost of controlling the technological operation, and the cost of eliminating the error.
The information support method for the quality assessment of the prepress process is proposed. Implementation of the developed information support methodology for assessing the quality of the prepress process in the form of an information system for assessing the prepress quality was carried out. This information system allows automating the method of “anticipatory” quality control proposed in this study. Thus, on the example of the technological operation of color correction and color separation by the “CMYK color model” parameter based on the use of the expert knowledge base subsystem, the probability of an error is 1, and the cost of eliminating the error is $ 6.
Experimental investigation and modelling of residual stresses in face milling of Al-6061-T3 using neural network
Authors: Mahdi Basma L. , Dalef Huda H. , Hussein Hiba K. 
Published: January 2023

Milling process is a common machining operation that is used in the manufacturing of complex surfaces. Machining-induced residual stresses (RS) have a great impact on the performance of machined components and the surface quality in face milling operations with parameter cutting. The properties of engineering material as well as structural components, specifically fatigue life, deformation, impact resistance, corrosion resistance, and brittle fracture, can all be significantly influenced by residual stresses. Accordingly, controlling the distribution of residual stresses is indeed important to protect the piece and avoid failure. Most of the previous works inspected the material properties, tool parameters, or cutting parameters, but few of them provided the distribution of RS in a direct and singular way. This work focuses on studying and optimizing the effect of cutting speed, feed rate, and depth of cut for 6061-T3 aluminum alloy on the RS of the surface. The optimum values of geometry parameters have been found by using the L27 orthogonal array. Analysis and simulation of RS by using an artificial neural network (ANN) were carried out to predict the RS behavior due to changing machining process parameters. Using ANN to predict the behavior of RS due to changing machining process parameters is presented as a promising method. The milling process produces more RS at high cutting speed, roughly intermediate feed rate, and deeper cut, according to the results. The best residual stress obtained from ANN is ‒135.204 N/mm2 at a cutting depth of 5 mm, feed rate of 0.25 mm/rev and cutting speed of 1,000 rpm. ANN can be considered a powerful tool for estimating residual stress
Determining the relationship between the simulation duration by the discrete element method and the computer system technical characteristics
Authors: Statsenko Volodymyr , Burmistenkov Oleksandr , Bila Tetiana , Statsenko Dmytro 
Published: January 2023

The object of this study is the relationship between the technical characteristics of a computing system and the duration of modeling the motion of particles of granular materials by the discrete element method. The scheme of the calculation algorithm is presented; its main stages are analyzed. A 3D model of a belt feeder and a mathematical model of particle motion were developed for calculations by the discrete element method in the EDEM 2017 environment. The physical and mechanical properties of bulk material are defined; the structural and technological parameters of equipment are determined. The parameters of the algorithm and computing system are analyzed. Those parameters are defined, the change of which does not affect the accuracy of calculations but can change the volume of computing resources used. These include the number of particles of loose material, the «grid» step, and the number of processor cores. The influence of these parameters on the duration of simulation was determined using a complete factor experiment.
Experimental studies have shown that for the duration of the simulation, the determining parameters are the number of particles and the number of processor cores. It was established that there is a linear relationship between the duration of the simulation and the number of particles. The regression equation is built, which makes it possible to predict the simulation time. It was also established that the software does not fully use all available computing resources; the maximum load on the processor when utilizing all available cores is 57 %. The use of RAM and disk subsystem almost did not change during simulation.
The results reported here make it possible to plan the use of computing resources for research using the discrete element method and to predict the simulation time
Estimates of the impact of information technology on the tourism supply chain performance in Vietnam
Authors: Nguyen Quoc Nghi , Hoang Thi Hong Loc 
Published: January 2023

In the context of the industrial revolution 4.0, information technology (IT) plays an essential role in the supply chain operation. Adopting IT helps companies stay competitive globally. Many researchers have highlighted the influence of IT on supply chain management and performance. It facilitates the linkages between components in the supply chain, minimizes operating costs, and enhances supply chain performance. Furthermore, IT helps increase the speed and quality of information exchange between partners in the supply chain, increasing competitiveness. To develop tourism, the application of information is a prerequisite for success. Currently, most tourism organizations in Vietnam have applied IT in operating their activities. However, new technologies' application and updated processes have not been synchronized. In Vietnam, literature reviews have indicated that there was no research demonstrating the role of IT in the supply chain performance of the tourism industry. This study was conducted to demonstrate the influence of IT on tourism supply chain performance in Vietnam. The level of impact is presented through the intermediary of “information sharing” and “electronic data interchange”. Research data was collected from 154 domestic and international travel agencies. The study has applied structural equation modeling (SEM) to prove the positive impact of IT on information sharing and electronic information exchange, thereby improving the efficiency of the supply chain. Research results have confirmed the significant role of IT in tourism supply chain performance in Vietnam. It concludes that tourism managers need to pay special attention and adequately invest in IT to improve the performance of the tourism supply chain continuously
Construction of a simulation model for calculating the labor intensity of the pre-print process of manufacturing books with audio accompanying
Authors: Horova Tetiana , Paliukh Oleksandr , Zorenko Yaroslav , Oliinyk Volodymir 
Published: January 2023

The object of research is preprint processes for the manufacture of audiobooks. The analytical and experimental studies reported here are based on the application of the methodology for devising a simulation model for calculating the complexity of preprint processes in the production of printed books with sound applications. The basic assumption of the study is that the use of simulation will contribute to the improvement of calculations of the complexity of preprint processes for making audiobooks. This cannot be achieved without analyzing the factors influencing the convenience of perception of textual and sound information and establishing the objective function of mutual influence of the text of the publication and audio. A methodology has been proposed for calculating the complexity of the preprint process of making audiobooks based on the developed algorithm of the technological process, mathematical representation of the structural model, as well as its components. It is shown that the process of creating audio accompaniment is affected by the content of printed pages, font design parameters, the selected format of page assembly, and the presence of illustrations. Based on the obtained expert assessments, a hierarchical representation of factors influencing the convenience of information perception is built; the interaction of parameters at different technological stages is described. The dependence of the complexity of the process of making audiobooks on the volume of the book edition in the accounting and publishing sheets, the size and capacity of the font, as well as the speed of sound recording of the printed text, has been established. It is determined that with an increase in font capacity within 200...1000 thousand characters, the calculated labor intensity increases by 5 % to 20 %. The largest limits of changes in the complexity of creating an audio accompaniment are 9 %, at the stage of processing graphic information – 50 %
Determining quality indicators of table grape varieties during storage in a refrigerating chamber in different variants
Authors: Kazimova İlhama , Nabiyev Ahad 
Published: January 2023

This study considers determining the quality indicators of table grape varieties when stored in a refrigerating chamber for different variants. The objects were white table grape variety, widely used in Azerbaijan, Ganja table grape variety, pink grape variety – Marandi Shamakhi, as well as the red grape variety Black Asma. Grape varieties stored in the refrigerator were studied according to five options.
Table grape varieties were stored in a refrigerating chamber under conditions of an adjustable gas environment (3–4 % CO2, 2–3 % О2) at a temperature of –1 and –2 °C, with air humidity of 90–95 %. It was found that at a temperature inside the pulp of 0+1 °C, the activity of enzymes decreased significantly compared to other options. In addition to the enzyme ascorbate oxidase, the activity of the studied enzymes o-diphenol oxidase, peroxidase, and catalase was 100 % suppressed in the Marandi Shamakhi grape variety. The inactivation of enzyme activity prevented the consumption during respiration of the nutrients that make up the grapes. As a result of slowing down metabolic processes, the appearance, naturalness, and nutritional value of the Marandi Shamakhi grape variety are significantly superior to other varieties.
When storing grape varieties according to option 5, the smallest total losses were observed in the Marandi Shamakhi grape variety. Very few microbiological losses were detected during the storage of the Marandi Shamakhi grape variety compared to other variants and varieties. It was stored in a refrigerating chamber in a controlled gas environment (3...4 % CO2, 2–3 % О2, at the temperature of the chamber of –2…–3 °C). A tasting was also carried out to determine the quality indicators when storing grape varieties in different versions; for version 5, the assessment was high
Experimental evaluation of the performance of a domestic water heating system under Baghdad climate conditions
Authors: H. Attia Osam , T. Al- Musawi Sanaa , A. Mousa Naseer , A. Mahmood Hussein , Adam Nor Mariah 
Published: January 2023

The aim of the current study is to evaluate the performance of a domestic water heating system for residential areas in Baghdad climatic conditions for substituting electric water heaters with solar-powered water heaters using solar collectors. Many countries, such as Iraq, are sluggish with electric power issues while receiving very high solar insolation. Solar energy is a clean, non-depleting and low-cost source that can be used especially in residential areas, which forms a great percentage of energy consumption by replacing electric water heating with solar water heating to reduce electricity usage. Therefore, six flat plate solar collectors with an absorbing area of 1.92×0.85 m with one 4 mm thick glass cover are utilized for experimental investigation under the Baghdad climatic conditions. The collector was tested under steady-state settings, which assumed that sunlight intensity, ambient temperature, and inlet-outdoor temperature difference in each collector in the system were constant throughout the operation. According to the experimental results, during the test months of November, December, January, and February, the time-weighted experimental daily average collector array efficiency is found in the range of 40 % to 60 %. Furthermore, the greater energy gain and performance of the solar collector array attain a peak value at solar noon. Additionally, a solar collector with flat plates can easily achieve relatively high water temperature levels of 70 °C in the winter season. In addition, using a solar domestic hot water system as a water heater in Baghdad climatic conditions by substituting electric water heaters is useful for saving power consumption
A time-frequency approach to ensuring stability of machining by turning
Authors: Petrakov Yuri , Danylchenko Mariia 
Published: January 2023

This paper reports a new approach to ensuring the stability of the turning process, which is based on the frequency-time characteristics of the technological machining system (TMS). The approach uses a mathematical model of the turning process as a single-mass system with one degree of freedom, taking into account negative feedback on the normal coordinate and positive feedback with a delay in cutting depth. A new criterion for the stability of the cutting process as a system with a delay in positive feedback is proposed, based on the analysis of frequency characteristics in the form of a Nyquist diagram. It is proved that such a system will be stable when the chart of its Nyquist diagram does not cover a point with coordinates [+1, 0] on the complex plane. The validity of the new criterion has been confirmed by comparing the simulation results in the time range with the location of the Nyquist diagram on the complex plane. Based on the new criterion of stability, an algorithm for automatic construction of a Stability Lobes Diagram (SLD) has been developed. The necessary a priori parameters of TMS, the ranges of frequency change, and the calculation step for constructing such a characteristic in the coordinates "cutting depth – spindle rotational speed" have been determined. The adequacy of the obtained results is confirmed by a full-scale experiment to assess the roughness of machined parts under cutting modes that fall into the area of stability and instability on the SLD chart. The full-scale experiment proved the possibility of a significant reduction in roughness according to the Rz parameter, from 43 µm to 18 µm, while increasing productivity by 1.28 times. The use of a stability lobes diagram is especially effective when programming CNC lathes where it is possible to select the spindle speed in a wide range.
Development of a method for solving the problem of it product configuration analysis
Authors: Ievlanov Maksym , Vasiltcova Nataliya , Neumyvakina Olga , Panforova Iryna 
Published: January 2023

The object of this study is the process of managing the configuration of an IT project.
During the study, the problem of analyzing the configuration of an IT product was solved. Research in this area is mainly aimed at solving the problem of configuration analysis during the refactoring of a monolithic IT product into individual services or microservices. Questions about the methods of decomposing the description of the architecture of the developed IT product into separate functional configuration items (CI) remain almost unexplored.
As a result of the study, a method has been developed that makes it possible to build in the form of a dendrogram all possible options for decomposing the description of the IT product architecture into separate CIs. Unlike existing ones, the proposed method takes into account the degree of repetition of CI descriptions. The method is based on a Smith Maknaoton's divisive algorithm for solving the clustering problem. For its use, when solving the problem, the method for determining the distance between two functional CIs was modified.
The devised method passed an experimental test during the development of the functional task "Formation and maintenance of the individual plan of the scientific and pedagogical employee of the department". As CI, 10 functions of the task were considered. To define these functions, the descriptions of 12 entities in the problem database were used. As a result, a dendrogram was constructed with all possible options for decomposing the description of the task architecture into separate CIs.
Using the results of the study, it is possible to distinguish separate functional CIs and CI groups, the descriptions of which are strongly similar to each other. This allows one to improve the quality of IT product development by assigning such CI groups to one and the same executor of the IT project.
The reported results are used to form backlogs of the IT product and further distribute their elements among the executors of the IT project