bluuebunny/crossref_metadata_2025_split huggingface dataset:
Testing Graph Database Systems via Graph-Aware Metamorphic Relations
Authors: Zhuang Zeyang , Li Penghui , Ma Pingchuan , Meng Wei , Wang Shuai 
Published: March 2024

Graph database systems (GDBs) have supported many important real-world applications such as social networks, logistics, and path planning. Meanwhile, logic bugs are also prevalent in GDBs, leading to incorrect results and severe consequences. However, the logic bugs largely cannot be revealed by prior solutions which are unaware of the graph native structures of the graph data. In this paper, we propose Gamera (Graph-aware metamorphic relations), a novel metamorphic testing approach to uncover unknown logic bugs in GDBs. We design three classes of novel graph-aware Metamorphic Relations (MRs) based on the graph native structures. Gamera would generate a set of queries according to the graph-aware MRs to test diverse and complex GDB operations, and check whether the GDB query results conform to the chosen MRs.
We thoroughly evaluated the effectiveness of Gamera on seven widely-used GDBs such as Neo4j and OrientDB. Gamera was highly effective in detecting logic bugs in GDBs. In total, it detected 39 logic bugs, of which 15 bugs have been confirmed, and three bugs have been fixed. Our experiments also demonstrated that Gamera significantly outperformed prior solutions including Grand, GD-smith and GDBMeter. Gamera has been well-recognized by GDB developers and we open-source our prototype implementation to contribute to the community.
Influence of media campaigns efforts to control spread of COVID-19 pandemic with vaccination: A modeling study
Authors: Verma Sandhya Rani , Verma Vinay , Pathak Rachana , Agarwal Manju , Naresh Ram 
Published: March 2024

Abstract
The outbreak of coronavirus disease 2019 (COVID-19) has been declared a pandemic by the world health organization on March 11, 2020,. Here, a nonlinear mathematical model is proposed and analyzed to study the spread of coronavirus disease in a human habitat. In modeling the dynamics, the total population is divided into five subclasses: susceptible population, asymptomatic infective population, symptomatic infective population, recovered population, and vaccinated population. It is assumed that the disease is transmitted directly from infectives. It is further assumed that due to the effect of media, susceptible individuals become aware about the disease and avoid contact with the infectives. The analysis of the model is performed using the stability theory of differential equations. Furthermore, conditions that influence the persistence of the system are obtained. We have also conducted numerical simulations to validate the analytical results. The model analysis shows that with an increase in media awareness, the spread of coronavirus disease decreases with a decrease in the number of infective populations.
Decay rate of the solutions to the Cauchy problem of the Lord Shulman thermoelastic Timoshenko model with distributed delay
Authors: Choucha Abdelbaki , Boulaaras Salah , Jan Rashid , Alnegga Mohammad 
Published: March 2024

Abstract
In this study, we address a Cauchy problem within the context of the one-dimensional Timoshenko system, incorporating a distributed delay term. The heat conduction aspect is described by the Lord-Shulman theory. Our demonstration establishes that the dissipation resulting from the coupling of the Timoshenko system with Lord-Shulman’s heat conduction is sufficiently robust to stabilize the system, albeit with a gradual decay rate. To support our findings, we convert the system into a first-order form and, utilizing the energy method in Fourier space, and derive point wise estimates for the Fourier transform of the solution. These estimates, in turn, provide evidence for the slow decay of the solution.
Ascorbic acid-mediated selenium nanoparticles as potential antihyperuricemic, antioxidant, anticoagulant, and thrombolytic agents
Authors: Siddique Muhammad Aamir Ramzan , Khan Muhammad Aslam , Bokhari Syed Ali Imran , Ismail Muhammad , Ahmad Khurshid , Haseeb Hafiz Abdul , Kayani Mustafa Mubin , Khan Suleman , Zahid Nafeesa , Khan Sher Bahadar 
Published: March 2024

Abstract
Selenium (Se) is an important trace element that is involved in controlling oxidative stress and inflammatory disorders. Gouty arthritis is the inflammation and pain within the joints and tissues caused due to the accumulation of monosodium urate (MSU) crystals. This study aimed to investigate the antigout, antioxidant, anticoagulant, and thrombolytic potential of ascorbic acid-mediated Se nanoparticles (A-SeNPs). Different analytical techniques were used to investigate the formation of A-SeNPs. The antigout potential of the nanoparticles was carried out using MSU crystal dissolution, uric acid (UA) degradation assay, and xanthine oxidase inhibition (XOI). A-SeNPs exhibited excellent antihyperurecemic activity in a concentration-dependent manner. It was observed that at the tested concentration of 20 mg·mL−1, the A-SeNPs demonstrated significant breakage and dissolution of MSU crystals and resulted in UA degradation of 67.76%. Similarly, A-SeNPs resulted in 76% XOI with an excellent IC50 of 140 µg·mL−1. Furthermore, considerable antioxidant activity was noted for the A-SeNPs as evaluated with multiple antioxidant assays. Finally, the NPs were found to have significant anticoagulant and thrombolytic potential. Thus, it was concluded that A-SeNPs have potent antihyperuricemic, antioxidant, anticoagulant, and thrombolytic activities, making them an ideal choice for future biomedical applications.
Vertrauensbildung unter Mitgliedern chinesisch-deutscher Teams bei virtuellen Meetings aus interkultureller Sicht
Authors: Pan Yaling , Chen Yangyang 
Published: March 2024

Zusammenfassung
Im Zuge des digitalen Wandels ist die virtuelle Kommunikation – sehr häufig in Form von virtuellen Meetings – das neue Normal in der Arbeitswelt geworden. Dies stellt insbesondere interkulturelle Teams vor neue Herausforderungen. Ein wichtiger Aspekt dabei ist die Vertrauensbildung zwischen Teammitgliedern aus unterschiedlichen Kulturkreisen, die die vorliegende Arbeit als Forschungsthema untersucht und erörtert. Unterstützt von qualitativen Experteninterviews wird in der Arbeit das genannte Thema am Beispiel von virtuellen Meetings unter Mitgliedern chinesisch-deutscher Teams beleuchtet. Durch leitfadengestützte Experteninterviews mit 28 chinesischen und 12 deutschen Fach- und Führungskräften von 20 chinesischen Unternehmen in Deutschland und zehn deutschen Unternehmen in China konnten Erfahrungen, Erwartungen und Empfehlungen in Bezug auf Vertrauensbildung in den chinesisch-deutschen Teams bei virtuellen Meetings erfasst werden. Basierend auf der Auswertung der in den Interviews gewonnenen Daten mit Hilfe von MAXQDA 2022 wurde das Konstrukt der Vertrauensbildung unter chinesischen und deutschen Teammitgliedern auf kognitiver, affektiver und konativer Ebene mit insgesamt acht Schlüsselfaktoren ausgearbeitet. Darüber hinaus wurden Atmosphäre und Umfeld als kontextueller Rahmen für die Vertrauensbildung postuliert und näher erläutert. Basierend auf der oben geschilderten systematischen Datenauswertung wurde ein multimodales und multidimensionales Modell zur Vertrauensbildung unter chinesischen und deutschen Teammitgliedern bei virtuellen Meetings entwickelt und es wurden Strategien und Ansätze zum Vertrauensauf- und -ausbau ausgelotet.
Synthesis and application feasibility study of cetyltrimethylammonium p-toluenesulfonate
Authors: Zhou Rui , Liu Qiaona , Wang Jianwei , Liu Guibin , Ji Wenyu , Dong Sanbao , Chen Gang 
Published: March 2024

Abstract
To improve the insufficient performance of anion on cationic surfactants and to further study the influence of anion on the surface properties, a cationic surfactant (cetyltrimethylammonium p-toluenesulfonate, CTATS) was prepared, and the relevant surface properties, including surface tension, critical micelle concentration, foaming ability and stability, corrosion inhibition and oil displacement efficiency were studied. Compared to cetyltrimethylammonium chloride (CTAC), CTATS exhibited higher surface activity, lower foaming volume, higher foam stability, higher corrosion inhibition performance and oil displacement efficiency. The results indicate that the CTATS has better performances as a surfactant type in oil and gas fields.
Correlation between Stenotrophomonas maltophilia incidence and systemic antibiotic use: A 10-year retrospective, observational study in Hungary
Authors: Gajdács Márió , Matuz Mária , Ria Benkő , Pető Zoltán , Hajdú Edit 
Published: March 2024

AbstractExtensive use of carbapenems may lead to selection pressure for Stenotrophomonas maltophilia (SM) in hospital environments. The aim of our study was to assess the possible association between systemic antibiotic use and the incidence of SM. A retrospective, observational study was carried out in a tertiary-care hospital in Hungary, between January 1st 2010 and December 31st 2019. Incidence-density for SM and SM resistant to trimethoprim-sulfamethoxazole (SXT) was standardized for 1000 patient-days, while systemic antibiotic use was expressed as defined daily doses (DDDs) per 100 patient-days. Mean incidence density for SM infections was 0.42/1000 patient-days; 11.08% were were resistant to SXT, the mean incidence density for SXT-resistant SM was 0.047/1000 patient-days. Consumption rate for colistin, glycopeptides and carbapenems increased by 258.82, 278.94 and 372.72% from 2010 to 2019, respectively. Strong and significant positive correlations were observed with the consumption of carbapenems (r: 0.8759; P < 0.001 and r: 0.8968; P < 0.001), SXT (r: 0.7552; P = 0.011 and r: 0.7004; P = 0.024), and glycopeptides (r: 0.7542; P = 0.012 and r: 0.8138; P < 0.001) with SM and SXT-resistant SM incidence-density/1000 patient-days, respectively. Implementation of institutional carbapenem-sparing strategies are critical in preserving these life-saving drugs, and may affect the microbial spectrum of infections in clinical settings.
Litigio estratégico para el derecho a abortar en los Casos «Manuela y Beatriz vs. El Salvador» ante la Corte IDH: resultados inusitados y posibles efectos
Authors: Castaldi Ligia-de-Jesús 
Published: March 2024

Los Casos Manuela y Beatriz fueron introducidos en el Sistema Interamericano de Derechos Humanos como casos de litigio estratégico para provocar una sentencia de la Corte Interamericana sobre Derechos Humanos que cree derechos relacionados con el aborto en El Salvador, uno de los países más provida de la región.
Este tratado regional vinculante sobre la mayor parte de los países de Latinoamérica y el Caribe no contiene una sola disposición relativa a aborto o a derechos sexuales y reproductivos; sí establece, por el contrario, en su artículo 4(1) el derecho a la vida de la persona por nacer y a su protección legal: «Toda persona tiene derecho a que se respete su vida. Este derecho estará protegido por la ley y, en general, a partir del momento de la concepción. Nadie puede ser privado de la vida arbitrariamente».
Este paper analiza los argumentos del Caso Beatriz, aún pendiente de resolución ante la Corte, y la sentencia del Caso Manuela que fue decidido en el 2022, donde la Corte dio la insólita orden de crear impunidad práctica para el delito de infanticidio en el ordenamiento jurídico interno, acto sin precedentes en ninguna corte internacional. El artículo examina sus inesperados resultados y posibles efectos en el ordenamiento jurídico interno, de cumplir el Estado con todas las órdenes emitidas por la Corte IDH.
Features of structural improvement of the cooking appliance for confectionery mass
Authors: Kobets Anatolii , Puhach Andrii , Volovyk Iryna , Puhach Vira 
Published: March 2024

The object of this study is the process of making confectionery masses using the example of boiling the jam mass with the introduction of pre-dried fruit and berry raw materials, followed by boiling in a sugar syrup solution on an advanced cooking device. A feature of the improved cooking apparatus is the elimination of intermediate heat carriers, ensuring mobility, and increasing the heat exchange surface. Additional heating of the stirring device increases the total heat exchange surface by 0.23 m2. The elimination of the steam component made it possible to install the device on a moving platform, thereby ensuring its use in small confectionery workshops.
A method of jam production with the introduction of pre-dried fruit and berry raw materials and subsequent boiling in a sugar syrup solution is proposed. A feature is preliminary drying of raw materials in a vertical cylindrical IR dryer to 25...35 % SR at a temperature of 40...55 °С, grinding to 1.0...3.0 mm, with subsequent addition to sugar syrup. Boiling of the jam mass with the introduction of plant ingredients was carried out in the temperature range of 50...60 °С in the improved mobile design of the cooking apparatus to the content of 60...75 % SR, within 10...15 minutes. The set duration of output (620 s) to the stationary mode of cooking the jam mass at a temperature of 55 °С in the improved design of the cooking apparatus, which is 30 % less. The introduction of a stirrer design with a heating surface increases the usable heating surface by 0.23 m2, while the cooking time for jam, for example, is reduced by 26 %, and the specific heat consumption is reduced by 1.34 times. The use of an improved mobile device in the practical activities of enterprises of the industry will make it possible to reduce the time of cooking confectionery masses and improve operational indicators
Development of plant integrity inspection on the API 5L X65 material under humid conditions: emerging fitness for service assessment approach
Authors: Aribowo Sidhi , Soedarsono Johny , Sicilia Christy , Riastuti Rini , Kaban Agus 
Published: March 2024

This work reports the development and corresponding monitoring of pipeline integrity inspection in the arid zone, which typically experiences external corrosion. The recent method poses the challenge which indaquate to synchronize the internal and external corrosion monitoring of API 5L X65 material trunklines and flowlines owing to imperfect types of inspection on the external progressive damage only. Red-clay soil, soil porosity, oxygen content, and moisture become critical parameters for controlling the corrosion of the above conditions. The combination of ultrasonic guided wave test, visual inspection, and design life calculation is implemented to address the above challenges. Based on the results, trunkline B (12-inch) is more severe than A (18-inch), with the shorter measured remaining thickness and remaining life of 4.35 mm and 1.9 years. External corrosion and visual inspection results show that sand threatens corrosion. The external corrosion product is evident at the 3 and 6 o’clock positions, corresponding to the exposure of the buried pipelines to moisture. The maximum metal loss in the trunk is 14.5 %, which confirms the environment of trunkline B. The internal corrosion has little effect on the integrity of the plant.
Despite the three fluid phases inside the flowlines and trunklines, the measured corrosion rate on the coupon is relatively lower. The highest recorded corrosion rate is 0.443 mmpy, while the contribution to internal corrosion from the rest of the monitor well is insufficient. This research is designed to model the strategy to utilize instrumentation of Ultrasonic tests and human intervention in corrosion mitigation
Establishing the character and share of changes in nutrients during the production of bread with the addition of dog rose syrup
Authors: Omarov Yashar , Bayramov Eldaniz , Haciyeva Aygun , Gurbanova Sevda , Aslanova Mehriban , İsmayılov Mehman , Nabiyev Ahad 
Published: March 2024

In the daily diet, bread is an excellent carrier of nutrients to replenish the body. In this direction, as an additive, dog rose syrup (DRS) can be indispensable for the production of a wide range of bakery products. One of the factors limiting the widespread use of DRS in baking production is the insufficient knowledge of its biological value and changes in the share of nutrients in the technological process. Therefore, the purpose of the study is to analyze the nutritional value, vitamin and mineral composition of wheat flour “Azamatli-95” of the first grade (A95WF), DRS from the variety “R.canina”, and bread with the addition of DRS. It was found that with the addition of 5, 10 and 15 % DRS to A95WF in bread samples, the content in g/100 g significantly increases: glucose (0.09±0.05), fructose (0.15±0.08), sucrose (0.02±0.01) and phenolic compounds (0.38±0.1); in mg/100 g: beta-carotene (0.152±0.076), vitamin C (33.6±16.3), potassium (40.07±20.03), magnesium (36.49±18.25), phosphorus (20.94±10.47); in µg/100 g: iron (128.86±64.43) and zinc (18.95±9.47) and the content in g/100 g slightly increases: starch, proteins and raffinose (0.01±0.01), cellulose (0.04±0.02), pectin substances (0.03±0.01); in mg/100 g: thiamine (0.006±0.003), riboflavin (0.013±0.006), niacin (0.015±0.008), calcium (5.39±2.7), sodium (1.25±0.62), sulfur (5.99±2.99); in µg/100 g: iodine (0.42±0.21), cobalt (0.62±0.31) with deviation from the best bread with the addition of 10 % DRS to A95WF. The resulting regression equations (АЕ<7 %) make it possible to predict and establish a relationship between the shares of changes in significantly changing nutrients, vitamins and minerals in the technological process and the increase in their content in bread
Determining the influence of technological parameters of electron beam surfacing process on the microstructure and microhardness of Ti-6Al-4V alloy
Authors: Matviichuk Vladyslav , Nesterenkov Vladimir , Berdnikova Olena 
Published: March 2024

This paper reports the devised technology and equipment for manufacturing parts and assemblies with pre-defined properties by 3D printing methods. Underlying the technology is the application of a high-power electron beam to fuse metal powder in a vacuum chamber with the formation of successive layers that repeat the contours of the digital model of the product.
The object of research is the process of surfacing products made of Ti6Al4V titanium alloy powder. The influence of technological parameters (speed and power of the electron beam) on the formation of the structure of the deposited metal and its mechanical properties was investigated.
3 samples printed under 3 modes were studied: beam speed, 270, 540, and 780 mm/s; power, 240, 495, and 675 W, respectively. The beam energy density was 44.5 J/mm3; the trajectory displacement step was 0.2 mm; the dynamic focusing current Idf was –0.31 A; and the powder layer thickness was 0.1 mm.
The samples were examined by conventional methods. The structures were studied using an optical microscope, images were recorded with a camera. The Vickers hardness was measured with a microhardness meter in the direction from the technological supports to the surface of the sample, as well as along the surface of the product, and in the layers of the middle part of the sample.
It was established that the articles had a dense cast structure of surfaced metal. On all samples, large crystallites with a uniform lamellar-acicular structure of α´-phase with a small amount of β-phase are formed along the height, mostly without defects with uniform microhardness both along the height and along the surface.
It was determined that the surfacing mode at beam speed, 240 mm/s; power, 270 W is the most rational for practical use. Under this mode, a stronger structure is formed when it is crushed, reducing the width of the crystallites by 1.55 and 1.17 times compared to other modes
Identifying some regularities of the aerodynamics around wind turbines with a vertical axis of rotation
Authors: Tanasheva Nazgul , Ranova Gulden , Satybaldin Amangeldy , Dyusembaeva Ainura , Bakhtybekova Asem , Shuyushbayeva Nurgul , Kyzdarbekova Sholpan , Sarzhanova Indira , Abdirova Nurgul 
Published: March 2024

The design of wind turbines with a vertical axis of rotation is quite simple, which successfully increases the level of efficiency. Existing vane wind turbines have a shortage of currents in the form of negative torque, and installations operating on the Magnus effect have a low lifting force. In this regard, the development and research of installations operating at speeds from 3 m/s, with combined blades with increased work efficiency is an urgent topic.
The object of the study is a wind turbine consisting of a system of rotating cylinders and fixed blades operating at low air flow speeds starting from 3 m/s. Numerical studies were carried out using the Ansys Fluent program and the implemented k-ε turbulence model. A special feature of the work is the combined use of two lifting forces: a cylinder and fixed blades, which made it possible to increase the output aerodynamic parameters. Calculations were performed for incoming flow rates of 3 m/s, 9 m/s, 15 m/s and cylinder rotation speeds of 315 rpm, 550 rpm, 720 rpm. It is determined that the period of change of the moment of forces T is 0.5 m/s, which corresponds to 2 revolutions of the wind wheel per minute. It was found that the cylinder rotation frequency in the range from 315 rpm to 720 rpm does not affect the period of change in the moment of forces, but the amplitude of the moment of forces increases with decreasing rotation frequency. The dependences of the rotation speed of the wind wheel on the velocity of the incoming flow, found by the method of sliding grids and 6DOF, are also obtained. It is determined that the installation begins to make revolutions from 3 m/s, with a positive torque of forces. The field of practical application of the numerical results will be useful for further research of wind turbines with combined blades
Isolation, identification of antimicrobial activity-possessing marine actinomycetes, fungi from samples collected at the Bach Long Vy to Ly Son island
Authors: Quyen Vu Thi , Hong Minh Le Thi , Mai Anh Nguyen , Cuong Pham Van , Thu Huyen Vu Thi , Mai Huong Doan Thi 
Published: March 2024

The marine environment has been known as a resource containing a lot of compounds with antibiotic, anti-tuberculosis and antiviral activities. Many of the marine microorganisms have been found to live in sediment, sand, surface or within the body of other living organisms such as sponges, soft coral, mollusk, algae… Natural products from marine actinomyces and fungi are considered an important source for the discovery of novel compounds, of their rich secondary metabolites. From 38 samples collected at 22 coordinates and different depths in the sea from Bach Long Vy island - Hai Phong to Ly Son island - Quang Ngai on the marine research vessel “Oparin Academik”, 40 actinomycetes and 20 fungal strains were isolated. The crude extracts of 60 isolates were primary screened for their antimicrobial activity against 7 pathogenic microorganisms by the Bioassay method in a 96-well tray. As a result, 53/60 strains were resistant at least 1 tested microorganisms, 22/60 isolates against 3 or more the test microorganisms, respectively. In particular, there were 4 isolates (three actinomyces G817, G819, G824 and fungus OM01) with the strongest resistance to four or more tested strains, which were then studied further. The results of phenotypic and molecular identification by 16S rRNA sequences for G817, G819, G824 and 18S rRNA sequence for OM01 showed that OM01 was Penicillium citrinum; G817, G819 strains belonged to Salinispora arenicola, while G824 was identified as Pseudonocardia carboxydivorans. The promising candidate isolates were analyzed in a phylogenetic tree based on MegaX software.