bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Effect of N-Hexane Extract of Sambiloto Leaves (Andrographis paniculata) on Spermatozoa Quality of Male ICR Mice (Mus musculus)
Authors: Asmawati Azis Andi , Adnan  , Nurmaidah Sitti , Citra Pratiwi Andi 
Published: August 2019

Abstract
The study aimed to determine the effect of N-Hexane extract of Andrographis paniculata leaves on testis weight of male mice (Mus musculus), along with the amount, motility, viability, and abnormality of its sperm. The tested animals used in this study were male Mus musculus aged 10-12 weeks with the average body weight (bw) of 21 g. The study was an experimental study with a Completely Randomized Design (CRD), which consists of one control group (A0, without extract) and three experimental groups (A1, A2, A3, with the extract concentration of 125 mg/kg bw, 250 mg/kg bw, and 500 mg/kg bw, respectively). The volume of extract given to each experimental mice was 1 cc per day, for a total of 18 days. The parameter of observation were the weight of testis, along with the amount, motility, viability, and the total of abnormal sperm. The data collected were analyzed by using F Test (α 0,05) and BNT Test (α 0,05). The result of data analysis showed that the N-Hexane extract of A. paniculata which was given for 18 days consecutively has affected the spermatozoa production of male mice. Each concentration of N-Hexane extract of A. paniculata (125, 250, and 500 mg/kg bw) had caused the decreasing of testis weight; the decreasing of spermatozoa production; the decreasing of motility and viability of spermatozoa; and the increasing of abnormal sperm. Hence, the study suggested that the N-hexane extract of A. paniculata has the potential to be used as antifertility treatment as it decreased the reproductive fuction of male Mus musculus. The extract concentration which cause the biggest effect is 500 mg/kg bw.
Reduction of PM10 Emission from A Retrofitted Multicyclone
Authors: Dewika M. , Rashid M. , Khairuninisa M.P. , Ruwaida J. , Sara Y.Y. 
Published: August 2019

Abstract
Multi-cyclone is one of the particulate control systems commonly used in the industry due to its low capital, operating, and maintenance cost as well as its reliability under a wide range of operational conditions. Unfortunately, it has low performance in collecting fine particulate especially of less than 10 µm in diameter or PM10. Thus, this limitation motivated a cost-effective retrofit of the existing conventional multi-cyclone. The retrofit was performed by creating a more negative pressure at the dust hopper of a conventional multi-cyclone, by drawing out a small portion of the air using an Induced Draft Fan. The particulate emission concentration and overall collection efficiency of the unit at various effective inlet velocities ranging from 6.2 to 19.8 m/s with particulate loading of 30 mg/m3 of 100 µm sample size diameter of Palm Oil Mill Boiler Fly Ash were investigated in this study. Interestingly, the introduction of suction increased the overall performance of the multi-cyclone by 10 to 20%. The finding suggests that a simple retrofit managed to increase the overall performance of the conventional multi-cyclone even for PM10.
Possibilities of fly ash activation in alumina recovery process
Authors: Marko M , Opravil T , Masilko J , Porizka J 
Published: August 2019

Abstract
This paper summarises various possibilities of high-temperature fly ash (HTA) and fluidised-bed filter ash (FFA) activation in metal and oxides recovery processes (esp. alumina recovery). The study deals with chemical and phase composition ash modification to improve leachability of aluminium compounds into sulphuric acid solution. Samples of HTA and FFA produced by power plant industry in the Czech Republic were subjected to diverse types of modification, such as sulphuric acid concentration, ash/acid ratio and sintering reactions using several types of solid agents. Sintering reaction were based on forming acid soluble calcium aluminates via donating the system with calcium oxide, - carbonate and - chloride. Phase and chemical composition were characterised by means of XRD and XRF analysis and the concentration of Al in acid solutions via ICP–OES. Appropriate modification of input material by high-temperature sintering reaction using calcium chloride combined with extraction into 10 wt. % sulphuric acid leads to dissolution up to 99% of aluminium from FFA and up to 94% form HTA. At least, irreplaceable dopant for cement production – gypsum, is formed as a by-product of leaching.
Stabilisation of belite prepared from modified limestone waste sludge
Authors: Rybova A , Kubatova D , Zezulova A 
Published: August 2019

Abstract
Presenting work deals with the use of waste materials - waste sludge from mining and washing of limestone and waste material from acetylene gas cylinders containing mainly tobermorite and xonotlite. Both materials were characterized by X-ray powder diffraction, laser granulometry and chemical analysis. After drying and milling of raw materials, they were mixed together and homogenised resulting in 3 sample series with different ratios of these materials. The mixtures were then burned at 1150°C and 1350°C and the main products formed were lime, dicalcium silicate, wollastonite, pseudowollastonite and gehlenite. To preserve hydraulically active belite, K2O as stabilizing agent was added in amount of 1 and 3 wt. %. Burned products were studied by means of X-ray diffraction and optical microscopy. Also hydration was observed.
Development of lightweight composites based on foam glass aggregate
Authors: Zach J , Sedlmajer M. , Bubenik J , Drdlova M 
Published: August 2019

Abstract
Building composites based on various types of lightweight aggregate have been widely used in the last decades for production of precast elements (e.g. panels) or whole structures with a good thermal insulation/mechanical properties ratio. The presented research investigated the feasibility of using foam glass aggregate, prepared from waste glass powder, in lightweight insulating composites for building industry. The effect of various binders (both organic and inorganic), binder/filler ratios and 3 types of fibres addition (PET, cellulose and mineral wool waste) on the physico-mechanical properties (bulk density, compressive strength) and thermal conductivity of the composite was evaluated. The results indicate, that applicable composites with sufficient mechanical parameters and low thermal conductivity (coefficient of thermal conductivity about 0,09 W/(m·K) can be prepared using both types of binders.
Rheological properties of belite-rich cement doped with sulfur
Authors: Bohac M , Kubatova D , Rybova A , Zezulova A , Stanek T 
Published: August 2019

Abstract
Reactive belite cement based on clinker doped with sulfur is a new type of low-energy cement that is still in the laboratory testing phase. In terms of application, one of the desired properties of new cement is its well-defined rheological behavior in fresh state. The chemical composition of the belite cement was determined by wet chemistry analysis, the phase composition of the belite cement clinker by quantitative X-ray powder diffraction analysis and microscopic point counting and specific surface by Blaine method. Rheological properties were determined by rotational rheometer in flow and oscillation regime. Shear and time dependent rheological parameters were calculated from flow curves. Stability of belite cement paste was judged based on the critical strain determination in amplitude sweep test. Setting was evaluated by Tussenbrock needle penetration test and oscillation time test on rheometer. The properties of the laboratory belite cement were correlated to industrial cement CEM I, CEM II/A-LL and CEM III/A. Reactive belite cement pastes show good flow properties both due to small amount of alite and larger amount of rounded belite grains and clusters. Belite rich cement show decent stability comparable to CEM III and very good dispersing efficiency of PCE based HRWR.
Influence of sealing gasket distortion on diesel engine injection pump mounting
Authors: Bistriceanu D P , Bujoreanu C 
Published: August 2019

Abstract
Currently, the common-rail injection system is composed from a high-pressure pump, injectors, an electronic control unit and a common rail. Over time, the common-rail system has been simplified and optimized, but it remains that the high-pressure pump can still be affected by distortion which occurs during the pump assembly process and in turn has an effect in mounting the pump to the engine. The main assemblies of the diesel pump are the front plate, housing, driveshaft and hydraulic head. Our paper presents a solution for minimizing the distortion and also any external leaks that may occur due to a change in design of the sealing gasket between the body and front plate. This modification realizes the connection interface with the engine block and facilitates the pump mounting. The tests analysis is performed on high pressure pumps to determine where and when the distortion occurs.
Classic or unconventional cotton yarns?
Authors: Bucevschi A , Fogorasi M S , Nicolaescu C , Barbu I 
Published: August 2019

Abstract
In this paper we compared a classic and an unconventional system for the manufacturing of cotton yarns 100%. For this comparison we analyzed the complexity of classical and unconventional technological lines, the differences between the yarn structures, the fields of use of the yarns, as well as a cost-benefit analysis.
From the point of view of the complexity of the technological lines and implicitly of all the necessary adjustments we can say that the technological line for the unconventional system is much easy and shorter. Considering the complexity of technological lines, we can say that the human resources requirement is much lower for unconventional technological lines. For this we realised a comparative calculation of costs for workers and for taxes that an employer has to pay. Starting from the complexity of the technological lines, the unconventional technological line being shorter with two machines, we made a comparative calculation of the energy consumption. The calculations were made for a spinning mill with a production of 4000 t/year, a typical production for a medium size. From the point of view of the production costs and investment effort, we can say that the unconventional system is better, but considering the structure of the yarns we can say that the destinations are different, so the unconventional yarns are better suited to certain products, such as the jeans clothing.
Mixed-model assembly line balancing problem with tasks assignment
Authors: Dziki K , Krenczyk D 
Published: August 2019

Abstract
Modern production systems are focused on the objectives dictated by customer needs oriented market. The best results are obtained by production systems combining the advantages of mass production with the possibility of implementing product variants corresponding to the needs of an individual customer. An Example of the production system that meets those conditions is mixed-model assembly line. The main problem of this solution is to plan the order of operations and assign the operators’ tasks in such a way to obtain the best balance of a given line. In this study, several metaheuristic methods that can be used to solve line balancing and tasks assignment problems are presented. The purpose of this study is to show the advantage of simulated annealing over other methods in solving the described problem. This paper is introduction to future research in scope of mixed-model assembly line optimization focused on employees’ effectiveness.
Study on the influence of the working regime on the quality of cut in the case waterjet processing of S 235 steel
Authors: Herghelegiu E , Radu M C , Schnakovszky C , Chirita B A , Tampu N C 
Published: August 2019

Abstract
The current paper presents the influence of different working regimes on the quality of cuts performed by abrasive water jet processing on S 235 steel. Four process parameters were varied: pressure (P), feed rate (Vf), quantity of abrasive material (Q) and distance between the cutting head and workpiece (h). Four quality parameters were analysed: width of the processed surface at the jet inlet (Li), width of the processed surface at the jet outlet (Lo), inclination angle of cut (α) and surface roughness (Ra). The analysis was done for three material thicknesses: 1mm, 6.5mm and 10mm.
Theoretical and experimental contributions on ultrasonic contactless examination of underground pipes through which pressurized fluids circulate
Authors: Nitoi D , Amza Gh , Petrescu V , Amza Z , Chivu O 
Published: August 2019

Abstract
In any civil or industrial construction, there are many embedded pipelines through which pressurized fluids or gases are circulate and which, over time, are subject to corrosion. Examination and monitoring of corrosion/erosion process in order to determine the service life of pipelines through which fluids circulate at different temperatures and / or pressures is a particularly important task for both the designer and the owner because knowledge of “health status” of these in time is extremely. On-site ultrasound control of wall thickness is based on simple propagation time measurements and is typically used to evaluate corrosion and erosion. The paper presents a non-destructive control used to determine pipe corrosion and lifetime, most notably ultrasonic examination without contact, using Lamb dispersing waves. For experimentation, the most important zones of a pipeline were chosen. Thus, methods of examination for 90° pipe elbow, welded pipe sections, reduction pipes, and seamless pipe sections have been established. The main parameters that have been taken into account are: actual and effective phase angle, temperature of the environment, roughness of the controlled surfaces, geometry of the controlled surfaces and the nature of the fluid flowing through the pipes (air, liquid or steam).
Research on the welding possibilities of dissimilar welded joints between two special alloys
Authors: Rontescu C , Cicic D T , Nitoi D F , Petriceanu C 
Published: August 2019

Abstract
Continuous development of the technological processes led to the necessity of using industrial equipment/installations made of high temperature resisting materials that provide the ability to work in heavily corrosive environments. The paper analyses two fusion welding options of dissimilar welded joints between two alloys, a cobalt based and a nickel based alloy. Here in are presented the results obtained after welding the two different materials using Tungsten inert gas (TIG) and Electron beam (EBW). Based on the results obtained after micrographic and macrographic examinations, it has been concluded that the two welding processes can be successfully used at dissimilar welded joints between the two types of material.
The influence of the rolling direction on the elastic characteristics of the bending samples
Authors: Stanciu M D , Bucur R. , Teodorescu H Draghicescu , Savin A 
Published: August 2019

Abstract
There are a number of factors influencing the bending process such as: the rolling direction of the blank; the minimum bend radius of the piece; the radii of the bending plate (of the mold); the play between the die and the punch, the recoverable strain of the piece after bending. The paper presents the experimental results regarding the influence of the lamination direction on the rheological behaviour of the cold bending parts, using the Lloyd LS100 Plus universal machine and the Nexygen Plus program. Thus, two categories of samples were analyzed: some being cutted off in the direction of rolling of the sheet at which the bending occurred on an axis perpendicular to the direction of rolling and others cutted on cross direction of rolling, the bending being produced along the axis parallel to the rolling direction. As an elasto-plastic process, after the loading process during experiment, the samples recorded an elastic strain recovery due to the kinetic energy stored during stresses. Thus, the recovered elastic deformation (springback) is more pronounced in the case of specimens cutted of in cross direction on the rolling fiber where the bending moment is produced in the direction parallel to the laminating fiber of materials.
Novel approach to semi-automated warehouse for manufacturing: design and simulation
Authors: Bartkowiak T , Kunc T , Kluska K , Myszkowski A , Pabiszczak S 
Published: August 2019

Abstract
The purpose of this paper is to present a novel design of semi-automated warehousing system for manufacturing applications. The approach bases on a new type of storage of carriers, called drawer racks. This concept adopts a modified shelving system based on single or double sections of row racks rotated by 90 degrees. Each drawer rack can move perpendicularly to the transportation corridor. The motion of the rack is possible thanks to the automatically guided vehicle that translates under the line of racks. In the paper, we show a comparison between the designed new system and conventional storage solutions for manufacturing. This indicates that the drawer racks require less space per pallet place without a significant interference with a building infrastructure. In this work, we discuss various design solutions for key components of the drawer-rack and AGV that can operate a rack of 40 pallet places. The designed system was tested if it meets the assumed performance level. The simulation model was created in discrete event system environment. We compared the warehouse layout and material flow for conventional row racks with the newly proposed system. We found out that the new system operates at the higher efficiency but requires less space.
Evaluation of the performance of an automated metallographic samples analysis system by means of Petri Nets modelling
Authors: Blaga F S , Vesselenyi T , Ursu M P , Hule V , Stanasel I 
Published: August 2019

Abstract
This paper presents the results of the research about the automation of the metallographic samples preparation and analysis processes. At the University of Oradea the authors designed and made an automated metallographic samples preparation and analysis system. This automated system can achieve polishing, attack by reagents and metallographic analysis. The flexible cell (the automated system) is made of two subsystems. The first subsystem, which is served by an industrial robot, performs the polishing and the sample surface assessment. The second subsystem, also served by an industrial robot, performs the reagent attack and finishes the metallographic analysis in order to determine the microstructure of the sample. The authors have designed a timed Petri nets model in order to assess the performance of the automated system and to identify the possible bottlenecks. The model is made for the case that the system is required to analyse two kinds of samples. The sequences performed by the industrial robots are modelled by transitions with associated timings that are equal to the real time periods taken by the robots to execute the corresponding actions. Other activities, such as grinding polishing, finishing polishing, reagent attack, washing, microscope examining, have been also modelled by means of transitions. The execution of a transition (the completion of a real sequence) is possible if certain conditions are met. These conditions are modelled into the Petri net by means of positions. The number of samples that can be analyzed in a certain time period can be determined by simulation.
A numerical approach in the assessment of a new class of fluids performance in laminar flow
Authors: Chereches E I , Chereches M , Minea A A , Prado J I , Lugo L 
Published: August 2019

Abstract
The present paper focuses on the analysis of the thermal conductivity for both base fluid and their ionanofluids. Sequently, an analysis of the new heat transfer fluids behavior in laminar flow was performed to compare the experimental and theoretical results. In terms of experimental, the results showed a higher thermal conductivity for the ionanofluids with the highest nanoparticles concentration. Plus, the thermal conductivity is decreasing slightly with nanoparticles mass fraction while it is almost constant with increasing temperature. On the other hand, in the case of thermal conductivity theoretically determined, this is decreasing with increasing temperature. Furthermore, Mouromtseff number was used to evaluate the relative heat transfer capacity of different fluids. Higher Mouromtseff indicates a better heat transfer capacity of a certain fluid compared to a regular one. Concluding, the present study compared the thermal conductivity for base fluid and Al2O3 dispersed in [C2mim][CH3SO3]:H2O in the particle concentration range of 1–10 % wt and temperatures between 283.50 and 333.38 K. The results demonstrate that the thermal conductivity enhances with concentration increase. The maximum thermal conductivity enhancement of 10.2% was found for 10 % wt of ([C2mim][CH3SO3]:H2O) + Al2O3 ionanofluids. An increased Mouromseff number was noticed for theoretical thermal conductivity.
Classic spark simulation using COMSOL software
Authors: Hnatiuc B , Sabau A , Astanei D 
Published: August 2019

Abstract
New surface treatments for maritime domain using clean technologies have been proposed. Among these technologies there are non-thermal plasmas produced at atmospheric pressure. The spark discharge produces such plasma by adapting the classic spark plug to a laboratory plasma minireactor and using an induction coil and a command circuit as power supply, adjusting the power and consequently the energy of the discharge.
The spark discharge produced at atmospheric pressure has been diagnosed by classical methods, starting from the electrical parameters and the optical parameters (Optical Emission Spectroscopy method). The parameters that have been determined are: the reduced electric field, the rotational temperature, the vibrational temperature, the electron density and the electron temperature.
This study proposes a COMSOL simulation using Plasma Module introducing as initial or boundary values the experimental data such discharge voltage, reduced electric field, maximum voltage, initial number of electrons or ions etc. It was assumed the hypothesis of Local Field Approximation (LFA) in order to solve the Maxwell equation and few elementary processes concerning more the electron influence than the ions influence. The final results indicate the spatial and temporal evolution of the electron density, the electron temperature and the electric field. The simulated data are in good agreement with the data obtained from the experimental values.