bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analytical determination of speed coefficient in the formula of V.P. Goryachkin for plow resistance
Authors: Vasilenko V V , Vasilenko S V 
Published: February 2021

Abstract
For almost all tillage implements traction resistance is calculated by the rational formula of academician V. P. Goryachkin with possible refinements of incoming parameters in accordance with the design of working bodies or operating conditions. The rational formula includes three coefficients associated with the unstable properties of the soil and the variable form of the working bodies. For this reason, the coefficients may not be the same for all tool designs and soil types. Each coefficient contributes an element of uncertainty to its ccomponent of the formula. The third component of the formula with a speed coefficient determines the part of the tractive effort to push back and turn the soil layers. The article calculates the power required for both of these actions of the working body. This power is determined by the lateral force acting on the soil layer. Lateral force analytically is associated with the tractive effort of the tractor taking into account the angle of setting of the moldboard and the coefficient of friction of the soil. This data is sufficient to compile a method for analytically calculating the speed coefficient. It turned out that it does not depend on the speed of the plough or the depth of plowing. It is influenced only by the density of the soil, the angular dimensions of the moldboard and the angle of friction on the soil. The calculated dependency graphs are given. At the usual values of the friction angle of 28-30° and the angle of inclination of the moldboard 43°, the speed coefficient is 2400 kg / m3. If we apply vibration, the friction angle is reduced to 25-26°, and the speed coefficient becomes equal to 2000 kg/m3. High-speed moldboards, having their design features, have a speed coefficient of 1700-1800 kg / m3.
Improvement of the hormonal and mineral composition of nutrient media used for in vitro regeneration of grape plants
Authors: Batukaev A A , Sobralieva E A , Palaeva D O , Batukaev M S 
Published: February 2021

Abstract
It was established that phytohormones have a positive effect on in vitro regeneration of grape varieties. When using standard nutrient media lacking auxins, cytokinins and gibberellins, shoot regeneration was reduced, and growth and development were inhibited. For in vitro microclonal propagation, MS agarized nutrient media, especially their modifications with 6-BAP (1.0 mg/l) for the first planting, 6-BAP (1.0 mg/l) combined with GK3 (1.0 mg/l) for the transplantation, and IAA (0.5 mg/l) for the second transplantation are optimal.
Results of CFD-simulation of a solar photovoltaic-thermal module
Authors: Strebkov D S , Filippchenkova N S 
Published: February 2021

Abstract
Currently, in the energy supply of agroindustrial complex facilities there is an increasing interest in the development of structures and engineering systems using renewable energy sources, including combined photovoltaic-thermal modules (PVT-modules), combining photovoltaic modules (PV-modules) and solar collectors in one design. The use of PVT-modules technology makes it possible to increase the electrical performance of solar cells due to their cooling during operation, while the use of PVT-modules integrated into the roofs and facades of buildings can significantly reduce the need for centralized electricity and heat supply. The purpose of this work is to develop a CFD model of a solar PVT module for producing an estimate of the thermal performance of a PVT module. Using the ANSYS Fluent software package, a CFD model of the PVT module was developed. The contours of the temperature distribution, the coolant pressure in the PVT module channel at different values of the coolant flow at the entrance to the PVT module were obtained. The paper presents the daily variation of thermal power and total insolation calculated using the solar calculator built into ANSYS. The verification of the developed CFD-model of the PVT-module showed the comparability of the calculated values with the data obtained analytically and experimentally - the relative error of the results was no more than ± 1%. ANSYS is an effective software package that allows simulating thermal processes in PVT-modules.
Water-evaporative cooling of sealed volumes
Authors: Shatskiy V P , Gulevsky V A , Osipov E N 
Published: February 2021

Abstract
The problem of cooling sealed volumes, in particular electronic equipment, with the help of counter-flow evaporative coolers of an indirect principle of operation is discussed in this paper. The equation of the heat balance of a limited volume is given according to its cooling by a closed cooling air flow. The paper presents a mathematical model of heat and mass transfer processes in counter-flow water-evaporative coolers of the indirect principle of operation, which includes parabolic and elliptic differential equations with distributed parameters, and a method for the numerical implementation of this model is also proposed. The results of the study allow concluding that it is possible to significantly reduce the temperature in sealed volumes with the help of inexpensive eco-friendly water-evaporative coolers of the indirect principle of operation.
Investigation of Buoy Hydrodynamic Damping Based on Model Testing Data Series of Indonesia Tsunami Buoy
Authors: Nugroho W.H. , Arifin  , Purnomo N.J.H. , Ali B. 
Published: February 2021

Abstract
Due to the recent Tsunami event in Indonesia in 2018, the Ina-TEWS program has been started again by the Indonesian Government. A new design has been manufactured and already deployed to the Indonesian water. This design is named Buoy G – 3. The tsunami early warning system (TEWS) consists of a tsunami buoy, an ocean bottom unit (OBU), a satellite and a ground station. The changes of the water pressure due to the seismic movement prior to the tsunami event will be acquired by OBU and sent the reading to the tsunami buoy by acoustic signal. Then, tsunami buoy transmits the signal to the ground station via satellite. The continuously link between OBU – Buoy – Satellite makes the buoy motions especially roll/pitch has to be restricted. Because of these the hydrodynamic motion damping assessment of this tsunami buoy becomes so important. This paper describes a hydrodynamic damping analysis for roll/pitch of the tsunami buoy that based on model testing data series of Indonesian Tsunami Buoy G-1 to G-3. The data analysis will be presented on graphics that show the aspect ratio of buoy diameter over draft (D/T) and form ratio of buoy displacement over weight of the cylindrical submerged form (Δ/W) against damping ratio (β). This study finds that by using the linear damping approximation the higher the aspect ratio D/T the larger roll/pitch damping ratio β, but also the higher ratio of Δ/W the smaller roll/pitch damping ratio β.
Porpoising instability study of the floatplane during take off operation on calm water
Authors: Aliffrananda M H N , Sulisetyono A 
Published: February 2021

Abstract
Floatplane is a type of airplane that can take-off and land on the surface of the water, for that it is equipped with a float that is installed under the fuselage to serve the buoyancy force. An important phenomenon that often occurs and should be avoided during a take-off operation is porpoising because it causes longitudinal instability of the float which has an impact on passenger safety and comfort. This paper describes the porpoising mechanism and the variables that can influence the occurrence of this phenomenon. The most dominant variables include the location of the longitudinal center of gravity (LCG) and the deadrise angle which are optimized by considering the take-off speed. A numerical arrangement based on computational fluid dynamics (CFD) techniques is proposed to simulate a three-dimensional fluid flow around a free-floating float in calm water. The accuracy of the simulation results shows a good fit compared to the previously published experimental and numerical results.
Comparative analysis of singlebeam and multibeam echosounder bathymetric data
Authors: Khomsin  , Pratomo D G , Saputro I 
Published: February 2021

Abstract
Gresik Port, East Java, is a port that has a very strategic location because there are several large industries such as the PT. Petrokimia Gresik, PT. Semen Gresik, PT. Maspion, PT. Wilmar, PT. Pelindo III, and other factories. This condition makes the need to obtain accurate necessary water information such as bathymetry. Bathymetry is an essential parameter of port management. There are currently two types of equipment used frequently to measure bathymetry, namely Singlebeam and Multibeam Echosounder (SBES and MBES). However, these two bathymetric survey instrument tools may not provide the same depth. This study compared the bathymetry data derived from MBES and SBES, collected at the same time and place. The depth comparison test between the SBES and MBES shows the Z0 of the statistical Z test is 0.018 m. This Z0 value is smaller than the Z table for the 95% confidence level, which ranges -1.96 < Z0 < 1.96. This result means that the data has a good quality within the standard 1a of the IHO SP-44 5th edition in 2008.[1] The comparison between the SBES and MBES surfaces reveals that the cut volume is greater than the fill volume, which is 21078.81 m3. This result means the SBES data has shallower average depths than the MBES data. The dredge volume difference of the SBES and the MBES data with 15 m depth as a reference is 23617 m3 inside the area 22.1 Ha. It means the dredge volume difference of 0.11 m3 per m2 or 11 cm difference depth in m2.
A tabular optimisation technique for steel lazy wave riser
Authors: Ogbeifun A. M. , Oterkus S. , Race J. , Naik H. , Moorthy D. , Bhowmik S. , Ingram J. 
Published: February 2021

Abstract
Steel lazy wave riser (SLWR) is derived from the simple catenary riser (SCR) by the installation of buoyancy modules on its section. Infinite SLWR configurations are possible, and this poses difficulties in determining the best configuration. However, it is possible to capture some suitable configurations which satisfy some given design criteria specific to a project. We referred to these as the optimum configurations for the problem. Several advanced optimization tools and techniques for engineering optimization are available. In this paper, we present a 2D tabular optimization method for SLWR, which is an index-based optimization technique. The approach reduces a multidimensional problem to a 2D type providing a significant reduction in the required computational resources. It combines the design variables in pairs and assigns indices to the resulting design points (configurations) for each combination. The optimum design points are then tracked through index matching using techniques such as data sorting and intersection operations. In the application of the technique to SLWR design, we set the number of design variable for the problem to three. This results in three pair of combinations of the design variables. The design variables are the apparent mass ratio, the sag bend elevation, and the arc height. The output variables of interest to be optimized include the SLWR hanging length, the smeared buoyancy section length, the smeared buoyancy thickness, the riser hang-off tension, the stress utilization and fatigue damage around the bends. Selected optimum SLWR configurations from the optimization process are subjected to an irregular wave simulation to demonstrate the suitability of the approach for such optimisation problems.
Tidal Flow Renewable Energy Potential In The Capalulu Strait
Authors: Kusuma C 
Published: February 2021

Abstract
The use of renewable energy that is environmentally friendly and without exhaust emissions will continue to be developed. Such as the utilization of kinetic energy from tidal currents into electrical energy with hydrokinetic turbines. The potential of the tidal current is one of the renewable energy sources given the very large majority of Eastern Indonesia is the ocean and not used optimally. The purpose of writing this paper as a reference counting tidal currents in the islands and strait Indonesia to convert electrical energy this paper calculates the potential of tidal electrical energy in the Capalulu Strait, North Maluku based on tidal stream tables. It is hoped that this paper will serve as an alternative energy source for the development of electrical energy in the province of North Maluku, especially the Sula Islands District (Sulabes, mangoli, and Taliabu) and Taliabu District.
Design of shell and tube heat exchanger for ballast water treatment applications on ships based on simulation
Authors: Iswantoro A , Semin  , Pitana T , Zaman M B 
Published: February 2021

Abstract
Now, environmental issues are the mostly discussed issue and become a top priority in the world. Whether it’s environmental damage or environmental pollution. The issue of pollution and damage to the environment and ecology in the region, which have an impact on living organisms, both humans, animals and plants. Environmental damage and pollution can occur on land, water, and air. With various forms of damage and pollution, the methods of handling are different. This research will focus on damage and pollution in waters as well as methods of handling and prevention, especially in marine waters. This research focuses on designing a heat exchanger by varying its types, namely shell and tube heat exchanger. From the modification of model, it will be known which one is more effective in performance. Both temperature exchange, pressure drop, flow rates, dimensions and materials are simulated by software. Where these parameters are influenced by the characteristics of the ship’s power of main engine. From 2 model of shell and tube heat exchanger that are one pass-shell and two pass-shell the result for case 1 the effectiveness are 92% & 93%, case 2 are 93% & 94% and case 3 are 94% & 95%.
Technical and Economical Analysis of Shipyard Re-Layout for Product-Oriented Work Breakdown Structure Implementation
Authors: Pribadi T W , Adam R N , Wahidi S I 
Published: February 2021

Abstract
The ship building method used by many shipyards in the world has led to work effectiveness and efficiency. One of them is Product-Oriented Work Breakdown Structure Concept (PWBS). PWBS belongs in group technology. In this method the parts that will be produced for ship building are categorized based on the similarity in form and production process. In Indonesia, not many shipyards have implemented this method. If a shipyard will change its production method, layout adjustments will be required. This research was conducted to analyze the technical and economic changes in the layout of the PT X with study in the case of 2 × 1800 HP tugboat. The technical analysis is done by observing the conditions of the production process and the existential shipyard layout. Furthermore, it also analyzes the investment costs to make changes of the shipyard’s layout and analyzes the feasibility value of the investment. Fabrication parts of tugboat are grouped into 4 categories, those are category A: internal parts from plate or part piece of plate, B: parallel parts, C: curved parts (bent plates) and D: shapes (miscellaneous operation). The new layout can reduce the distance of material handling in category A by 2-19%, category B by 29%, category C by 57% and category D by 2-56%. Fabrication costs are estimated to be reduced to IDR 36,152,935 and sub assembly cost reduced to IDR 27,178,200 by applying this group technology concept. Investment costs to make changes the layout is IDR 7,471,954,000. This project is worth to do with 11% IRR value and payback period will occur in the 3rd year.
Analysis of Ferry Fleet Operation Planning: A Case Study of Ujung - Kamal Ports
Authors: Wuryaningrum P. , Mustakim A. , Sodik A.M. , Permana C. B. S. 
Published: February 2021

Abstract
Ujung - Kamal Ports is a ferry port that connects the island of East Java with Madura Island. These ports have a distance of about 2.5 nautical miles with shipping times of approximately 30-45 minutes. Since the operation of the Suramadu Bridge in 2009, the flow of passenger and vehicle visits at the Ujung-Kamal ports has decreased. this causes shipping operators for the Ujung-Kamal ferry port to reduce fleet size and operating time. Not only that, the number of fleets operated is uncertain, this has resulted in an inconsistent schedule for ship departures. besides that, it also resulted in many passengers having to wait or be late with ship departures. This study aims to plan the optimal Ujung-Kamal ferry operation. The method used in this research is the optimization method with scedulling problem. After optimizing the number of operating vessels, 2 ships were selected. The vessels are KMP Jokotole and KMP Tongkol. the ship sailing schedule in one day is 10 and 8 trips. The minimum cost for KMP Jokotole is IDR 6.357.855 per day and for KMP Tongkol is IDR 5.615.357 per day and the total cost per day is IDR 11,973,213.
Genomic regulation of plant mating systems: flexibility and adaptative potential. A commentary on: ‘A new genetic locus for self-compatibility in the outcrossing grass species perennial ryegrass (Lolium perenne)’
Authors: Mable Barbara K 
Published: February 2021

This article comments on:
Lucy M. Slatter, Susanne Barth, Chloe Manzanares, Janaki Velmurugan, Iain Place and Daniel Thorogood A new genetic locus for self-compatibility in the outcrossing grass species perennial ryegrass (Lolium perenne), Annals of Botany, Volume 127, Issue 6, 7 May 2021, Pages 715–722, https://doi.org/10.1093/aob/mcaa140
Unreadiness for hospital discharge predicts readmission among cardiac patients: results from the national DenHeart survey
Authors: Rotvig Camilla , Christensen Anne Vinggaard , Rasmussen Trine Bernholdt , Borregaard Britt , Thrysoee Lars , Juel Knud , Thorup Charlotte Brun , Mols Rikke Elmose , Berg Selina Kikkenborg 
Published: February 2021

Abstract

Aims
Readiness for hospital discharge describes a patient’s perception of feeling prepared to leave the hospital. In mixed patient populations, readiness for hospital discharge has shown to predict readmission and mortality in the short term. The objectives of a population of men and women with cardiac diseases, were to investigate: (i) whether readiness for hospital discharge predicts readmission and mortality within 1-year post-discharge, as well as (ii) the association between ‘physical stability’, ‘adequate support’, ‘psychological ability’, and ‘adequate information and knowledge’ and readiness for hospital discharge.

Methods and results
Data from the national cross-sectional survey DenHeart were used and included patients with cardiac diseases at hospital discharge. Readiness for hospital discharge was evaluated by one self-reported question, and attributes were illuminated by Short-Form-12, the Edmonton Symptom Assessment Scale and ancillary questions. Data were combined with national registries at baseline and at 1-year follow-up. Cox proportional-hazards model were used to regress readmission and mortality. The analysis included 13 114 patients (response rate: 52%). The majority responded that they felt ready for hospital discharge (95%). Feeling unready (n = 618) was a predictor of 1 year, all-cause readmission among women and men [hazard ratio (HR) = 1.43, 95% confidence interval (CI) 1.18–1.74; HR = 1.59, 95% CI 1.34–1.90]. No significant results were found on all-cause mortality. The four attributes were associated with unreadiness at hospital discharge.

Conclusion
Not feeling ready for hospital discharge was a predictor of increased readmission risk in women and men with cardiac disease during 1 year after hospital discharge. Four attributes were significantly impaired in patients feeling unready for hospital discharge.
Modulation effects of Dendrobium officinale on gut microbiota of type 2 diabetes model mice
Authors: Wang Sai , Li Xin-Yu , Shen Liang 
Published: February 2021

Abstract
In recent years, the relationship between type 2 diabetes (T2D) and gut microbiota has attracted much interest. Dendrobium officinale is a valuable traditional Chinese medicine (TCM) with anti-T2D potential, while its action mechanism remains to be further studied. This study was designed to investigate the modulation effects of D. officinale on gut microbiota of T2D model mice to provide clues to its pharmacology by high-throughput sequencing techniques. It was found that D. officinale supplement could significantly reduce the fasting blood glucose levels of T2D mice. Dendrobium officinale supplement could modulate the composition of gut microbiota and increase the relative abundances of key bacterial taxa associated with T2D development, including Akkermansia and Parabacteroides. Compared with placebo group mice, several Kyoto Encyclopedia of Gene and Genomes pathways associated with T2D altered in the D. officinale treated group. These findings indicated the modulation of D. officinale on gut microbiota of T2D mice, which provide potential pharmacological implications.
Homolog of Saccharomyces cerevisiae SLX4 is required for cell recovery from MMS-induced DNA damage in Candida albicans
Authors: Wang Yueqing , Wang Na , Liu Jia , Zhang Yaxuan , Li Xiaojiaoyang , Han Qi 
Published: February 2021

ABSTRACT
SLX4 is a scaffold to coordinate the action of structure-specific endonucleases that are required for homologous recombination and DNA repair. In view of ScSLX4 functions in the maintenance and stability of the genome in Saccharomyces cerevisiae, we have explored the roles of CaSLX4 in Candida albicans. Here, we constructed slx4Δ/Δ mutant and found that it exhibited increased sensitivity to the DNA damaging agent, methyl methanesulfonate (MMS) but not the DNA replication inhibitor, hydroxyurea (HU). Accordingly, RT-qPCR and western blotting analysis revealed the activation of SLX4 expression in response to MMS. The deletion of SLX4 resulted in a defect in the recovery from MMS-induced filamentation to yeast form and re-entry into the cell cycle. Like many other DNA repair genes, SLX4 expression was activated by the checkpoint kinase Rad53 under MMS-induced DNA damage. In addition, SLX4 was not required for the inactivation of the DNA damage checkpoint, as indicated by normal phosphorylation of Rad53 in slx4Δ/Δ cells. Therefore, our results demonstrate SLX4 plays an important role in cell recovery from MMS-induced DNA damage in C. albicans.