bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation on flow pattern in a hydraulic ram pump at various design and setting of its waste valve
Authors: Suarda M , Sucipta M , Dwijana I G K 
Published: June 2019

Abstract
A hydraulic ram pumps are simple structures, consisting of two moving parts, the waste valve and the press valve. The waste valve mainly affects the magnitude of the impulse force generated. However, interaction of all elements of hydraulic ram pump system influence each other makes its operation becomes complex. Moreover, a detailed description of this hydraulic ram pump has not been well understood. In order to get the hydraulic ram pump designs, it needs to recognize comprehensively the water flow phenomenon that take place in the hydraulic ram pump working cycles. Therefore, visualization of the water flow characteristic in the hydraulic ram pump is done by constructing a hydraulic ram pump model using a transparent material that is acrylic. The characteristics of the waste valve are affected by parameters such as the orifice diameter of the valve, the diameter of the valve disk, the step length, and the valve weight and the discharge and water head of the hydraulic ram pump drive. Besides all these parameters affect each other. Therefore, in this experiment, experimental testing was conducted in the laboratory on hydraulic ram pump waste valve model to investigate the effect of waste valve orifice and disk diameter on hydraulic ram pump. The results showed that the diameter of orifice and disk of the waste valve have significantly influencing the flow pattern in the hydraulic ram pump body and its time movement each stage of the cycle. The greater the diameter of the orifice and the disk of the waste valve the velocity of water that has vortex more and more, so the speed of water flow in the body of the pump also decreases. Furthermore, the larger the diameter of the waste valve disk the shorter the interval of the hydraulic ram pump valve movements, so the frequency of the hydraulic ram pump valve movement increases.
The effect of using poly (methyl methacrylate) (pmma) in the preparation of free standing 3d graphene
Authors: Pransisco P 
Published: June 2019

Abstract
In order to get a free standing 3D graphene during the synthesis process, poly (methyl methacrylate) (PMMA) is often used to dissolve Ni agent. However, the use of this polymer is giving defect on structural and chemical composition of 3D graphene. The aim of this article is to study the effect of using PMMA in removing Ni agent on 3D graphene synthesis process. The 3D graphene was successfully synthesized through low pressure chemical vapor deposition (LPCVD) system. The structural defect and chemical composition study was examined using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Raman spectroscopy. Based on the findings, the use of PMMA and hot acetone was not really recommended method. The result was confirm that Ni element and oxide are still presence after the treatment process, and these structural and chemical defect might be effect to the properties of the free standing 3D graphene.
Mechanical properties and fluid absorption at the brake lining of hybrid composite
Authors: Suriadi I G A K , Atmika I K A 
Published: June 2019

Abstract
Brake lining is one of the active safety components in the vehicle that serves to reduce and stop the vehicle speed. Brake lining is arranged in brake system made of asbestos material and other materials such as metal oxide, sulphate, Mn or Co and silikan. In research to realize the environmentally friendly brake pads have developed hybrid composite materials with reinforced basalt, clamshell and alumina as the material of brake pad. The purpose of this study was to examine sea water absorbtion and impact in brake pad and can look for alternative brake pads that are environmentally friendly. In this test obtained the value of impact strength of asbestos 0,000374867 J/mm2. From the calculation of the composite test with variations in composition, the highest impact strength value is obtained on composite HC2 with a value of 0.000339547 J/mm2. This is due to the composite hybrid with a variation of 40% basalt, 10% clamshells, 10% aluminium and 40% resin, which has a stronger and more perfect bond between metric and basalt compared to other hybrid composite. Seawater absorption by composite materials asbestos brek lining materials. showing that the trend after the 24th day immersion starts to be constant for each specimen. From these conditions, the absorption capacity of specimen I was higher than specimen II of 0.51% and Specimen III was 1.01%, but lower than the asbestos material at 1.14%.
Pyrolysis study of coconut leaf’s biomass using thermogravimetric analysis
Authors: Rajendra I M , Winaya I N S , Ghurri A , Wirawan I K G 
Published: June 2019

Abstract
Coconut leaf is one of the most potential biomass to be converted into bio-oil through pyrolysis process and the availability in Indonesia is abundance. The mechanism of decomposition of coconut leaf into bio-oil productions requires further research because of the complexity of pyrolysis and differences in biomass composition. Therefore, the design, optimization and modeling of pyrolysis processes is strongly influenced by biomass characteristics. The purpose of this study was to find the characteristic differences in pyrolysis behavior of the three main parts of coconut leaf based on its constituent parts; leaflets, midrib and whole leaf. Moisture is removed by drying the sample in an electric oven at 110°C for 24 hours. Characteristics were tested using Cellulose Analysis, Ultimate Analysis, and Heat Value, whereas pyrolysis behavior used Thermogravimetric Analyzer (TGA). The results show that leaflets, midrib and whole leaf exhibit different pyrolysis behavior. In terms of considering flow process of separation, the whole leaf becomes an option as a fuel for further pyrolysis processes. The maximum temperature that as a reference in the pyrolysis process of coconut leaves is 500°C with temperature rate of 20°C/min and the process lasts as long for 130 minutes.
The metal gasket sealing performance of bolted flanged with fem analysis
Authors: Karohika I M G , Antara I N G 
Published: June 2019

Abstract
There is a wide variation of flange style and configuration, but only four types of facing are widely used, which are raised face, flat face, ring joint facing and lap joint flange. Corrugated metal gaskets 400MPa-mode has better performance than gaskets 0Mpa-mode for flat face flange type. In this study we investigated the performance of corrugated metal gasket 400MPa-mode for three types of flange facing which are raised face, flat face and combination raised-flat face. The finite element method employed to analysis the effect of different types of flange on contact width and contact stress in relation with axial force of corrugated metal gasket. The result shows corrugated metal gasket 400MPa-mode give good performance for all type of flange face.
Influence of dies type for gasket forming shape
Authors: Karohika I M G , Antara I N G , Budiana I M D 
Published: June 2019

Abstract
Performance of metal gasket influenced by the final design of the forming result. Good shape of the gasket will give optimal leakage performance. It is difficult to produce good shape because of the spring back effect. In this study, we investigated the forming process of metal gasket 400MPa-mode for two types of dies which are open dies and closed dies. The finite element method employed to analyze the effect of different types of dies on the final design of the corrugated metal gasket. The simulation shows corrugated metal gasket 400MPa-mode with closed dies result in better final shape than open dies.
Energy analysis of solar farm planning in weh island, aceh, indonesia
Authors: Rahmawati S , Iqbal M , Sara I D 
Published: June 2019

Abstract
The paper discusses the simulation study and analysis of output energy produced by 5MW solar farm located in Weh Island, Aceh Province, Indonesia. Weh Island is a tourist area. Currently, a diesel power plant supplies all of its electricity requirement. Most of the user were household, hotels and public facilities. Weh Island consists of 8,858 family houses, 124 medium and small hotels. 48 educational facilities (formal schools and traditional Islamic schools) 48 healthcare facilities (consisting of 2 hospitals, 6 public healthcare centre, and 23 public healthcare service units). The daily peak load of electricity usage occurred at two points; 03.00 pm and 08.00 pm, with the peak load reaches 4,667 kW and 5,009 kW respectively. The solar farm was designed based on the peak electrical load (5MWp) using grid-connected system to ensure continuous availability in the area, as solar farms are only able to operate during the day. The system used 300 Wp Monocrystalline technology panels with 16.4% efficiency and inverter with 20Kw capacity and 98.8% efficiency. Each of the inverter was designed to serve 66 to 67 solar panels. Therefore, in order to produce 5MW of electricity, the solar farm was developed with 16,668 solar panels and 250 inverters on 32,309 m2 of land space area. The simulation model of the solar farm was developed using PVsyst simulation software. The simulation study was conducted based on monthly solar radiation, temperature and daily radiation time of the Weh Island during one year. The result of the study showed that the system produced sum annual energy of 7991 MWh/year and the solar panel obtained the average radiation of 5.2 kWh/m2/day. The highest energy output was 792.4 MWh which was produced in January, and the lowest energy output was 603.3 MWh which was produced in September. Furthermore, when the usage time distribution of the electricity was formulated into the model, the simulation result showed that the solar farm system were able to accommodate the electricity requirement in Weh Island.
The effect of diameter downcomer in air entrainment process from vertical plunging water jet with downcomer
Authors: Warjito  , Budiarso  , Jaya R L 
Published: June 2019

Abstract
The development of technology on flotation in water-waste treatment is very fast. This environmentally friendly technology using bubbles. The characteristic of the bubble causes the material to separate into the material hydrophilic or hydrophobic. Obviously with the addition of other chemicals. At the time of bubble formation, air entrainment events occur. This study aims to determine the parameters that affect the entrainment of air events that is the relationship of diameter downcomer and jet velocity to air entrainment. Set up tools used are pump, nozzle, downcomer, flow meter, reducer and glass water tank. All that is connected with the pipe, the data obtained in the form of video and photos using the camera. From there obtained quantitative and qualitative data, for quantitative data in the process using image processing program. Results from this research that jet velocity affects air entrainment, whereas the diameter of the downcomer affects the value of the air entrainment.
The characterization tensile and thermal properties of hibiscus tiliaceus cellulose fibers
Authors: Sari N H , Padang Y A 
Published: June 2019

Abstract
In our study, hibiscus tiliaceus (HT) fibers were treated with potassium hydroxide (KOH) 8% for two hours at ambient temperature. The tensile strength and thermal properties of the treated fibers were examined by using tensile test and Thermogravimetric analysis (TGA). The surface structure of the hibiscus tiliaceus fibers were analyzed using Scanning Electronic Microscopy (SEM). Experimental results revealed that under KOH treatment, the tensile strength increased up to 5144.9 MPa, resistance thermal and cellulose of the fibers become increased; due to hemicellulose content were reduced of the fibers. SEM images show that after alkali, the hibiscus tiliaceus fibers surface becomes clear, fibril and rougher.
Performance of vertical axis Savonius wind turbines related to the fin number on the blade
Authors: Ridwan  , Setyawan I , Setiyono  
Published: June 2019

Abstract
Model and the number of blades on the wind turbine greatly affect its performance. The purpose of this research is to know the effect of the fin on Savonius turbine U type 4 number blade. Simulation using Solidworks (Flow Simulation) software based on Finite Element Analysis (FEA) Method, will show pressure distribution and velocity distribution of blade rotor savonius wind turbines. The simulations to compare on the variation of the addition of 1 fin, 2 fins, and blade without fin (standard). The wind speed variations applied to each of the blades is 5 m/s, and 7 m/s respectively. The simulation results showed that the performance of pressure distribution and velocity distribution on each blade is higher and more widespread and evenly distributed, occurring on each blade with the addition of two fins compared to a single fin turbine and standard blade (without the addition of fin). The higher wind speed applied to the turbine blades will have a significant effect on the value of pressure distribution and velocity distribution on the blade. The effectiveness of pressure distributions and velocity distributions that occurs on the turbine blades will be significant to effect for the rotation on the turbine shaft, so as to have a significant impact on the performance the turbines.
Remaining strength assessment of dented pipe based on depth and strain based criteria
Authors: Akbar M , Huda F , Dewi D K 
Published: June 2019

Abstract
There are currently two methods which are used in feasibility operation of dented pipeline systems, namely depth based and strain based. In this research, both methods will be compared to determine conservatism degree of each method and as a guideline and considerations in the integrity assessment of pipeline system. The finite element method with including nonlinearities of material properties and dimension will be used as a tool in the analysis. Static indentation was held with using half ball indenter. Variations of applied load are 600 N, 1000 N, 1500 N, 2000 N, and 2500 N. The results of indentation are dent depth ratio (d/D) with value 1,93 %, 3,78 %, 5,53 %, 7,08 %, 10,63 %, and plastic strain with value 4,24 %, 5,87 %, 8,36 %, 11,43 %, and 12,93 %, respectively. Based on the Code, depth based criteria use d/D<6 % and strain (ɛ) < 6 % as an acceptance criteria. Based on this research, it can be concluded that strain based method is more conservative rather than depth based method. Then, five model of defected pipe will be simulated in the condition of operation pressure applied to the pipe. Operation pressure was varied with (P/Py) 0.2, 0.4, 0.6, 0.8, and 1. The results show that depth of dent will decrease with variation of strain value.
Kobayashi isometries in convex domains
Authors: Edigarian Armen 
Published: June 2019

In [Invent. Math. 207 (2017), pp. 1289–1299] it is claimed that Kobayashi isometries in strictly convex domains are holomorphic or anti-holomorphic. Generally, following the idea of St. Antonakoudis of using the relation between Klein and Poincaré models, we give simplified and complete proof of this fact.
Iterative allogamy–autogamy transitions drive actual and incipient speciation during the ongoing evolutionary radiation within the orchid genus Epipactis (Orchidaceae)
Authors: Sramkó Gábor , Paun Ovidiu , Brandrud Marie K , Laczkó Levente , Molnár Attila , Bateman Richard M 
Published: June 2019

AbstractBackground and AimsThe terrestrial orchid genus Epipactis has become a model system for the study of speciation via transitions from allogamy to autogamy, but close phylogenetic relationships have proven difficult to resolve through Sanger sequencing.MethodsWe analysed with restriction site-associated sequencing (RAD-seq) 108 plants representing 29 named taxa that together span the genus, focusing on section Epipactis. Our filtered matrix of 12 543 single nucleotide polymorphisms was used to generate an unrooted network and a rooted, well-supported likelihood tree. We further inferred genetic structure through a co-ancestry heat map and admixture analysis, and estimated inbreeding coefficients per sample.Key ResultsThe 27 named taxa of the ingroup were resolved as 11 genuine, geographically widespread species: four dominantly allogamous and seven dominantly autogamous. A single comparatively allogamous species, E. helleborine, is the direct ancestor of most of the remaining species, though one of the derived autogams has generated one further autogamous species. An assessment of shared ancestry suggested only sporadic hybridization between the re-circumscribed species. Taxa with the greatest inclination towards autogamy show less, if any, admixture, whereas the gene pools of more allogamous species contain a mixture alleles found in the autogams.ConclusionsThis clade is presently undergoing an evolutionary radiation driven by a wide spectrum of genotypic, phenotypic and environmental factors. Epipactis helleborine has also frequently generated many local variants showing inclinations toward autogamy (and occasionally cleistogamy), best viewed as incipient speciation from within the genetic background provided by E. helleborine, which thus becomes an example of a convincingly paraphyletic species. Autogams are often as widespread and ecologically successful as allogams.
Interactive exploration of heterogeneous biological networks with Biomine Explorer
Authors: Podpečan Vid , Ramšak Živa , Gruden Kristina , Toivonen Hannu , Lavrač Nada 
Published: June 2019

Abstract

Summary
Biomine Explorer is a web application that enables interactive exploration of large heterogeneous biological networks constructed from selected publicly available biological knowledge sources. It is built on top of Biomine, a system which integrates cross-references from several biological databases into a large heterogeneous probabilistic network. Biomine Explorer offers user-friendly interfaces for search, visualization, exploration and manipulation as well as public and private storage of discovered subnetworks with permanent links suitable for inclusion into scientific publications. A JSON-based web API for network search queries is also available for advanced users.

Availability and implementation
Biomine Explorer is implemented as a web application, which is publicly available at https://biomine.ijs.si. Registration is not required but registered users can benefit from additional features such as private network repositories.
MaNGA: a novel multi-niche multi-objective genetic algorithm for QSAR modelling
Authors: Serra Angela , Önlü Serli , Festa Paola , Fortino Vittorio , Greco Dario 
Published: June 2019

Abstract

Summary
Quantitative structure–activity relationship (QSAR) modelling is currently used in multiple fields to relate structural properties of compounds to their biological activities. This technique is also used for drug design purposes with the aim of predicting parameters that determine drug behaviour. To this end, a sophisticated process, involving various analytical steps concatenated in series, is employed to identify and fine-tune the optimal set of predictors from a large dataset of molecular descriptors (MDs). The search of the optimal model requires to optimize multiple objectives at the same time, as the aim is to obtain the minimal set of features that maximizes the goodness of fit and the applicability domain (AD). Hence, a multi-objective optimization strategy, improving multiple parameters in parallel, can be applied. Here we propose a new multi-niche multi-objective genetic algorithm that simultaneously enables stable feature selection as well as obtaining robust and validated regression models with maximized AD. We benchmarked our method on two simulated datasets. Moreover, we analyzed an aquatic acute toxicity dataset and compared the performances of single- and multi-objective fitness functions on different regression models. Our results show that our multi-objective algorithm is a valid alternative to classical QSAR modelling strategy, for continuous response values, since it automatically finds the model with the best compromise between statistical robustness, predictive performance, widest AD, and the smallest number of MDs.

Availability and implementation
The python implementation of MaNGA is available at https://github.com/Greco-Lab/MaNGA.

Supplementary information
Supplementary data are available at Bioinformatics online.
Deletion of Fmr1 from Forebrain Excitatory Neurons Triggers Abnormal Cellular, EEG, and Behavioral Phenotypes in the Auditory Cortex of a Mouse Model of Fragile X Syndrome
Authors: Lovelace Jonathan W , Rais Maham , Palacios Arnold R , Shuai Xinghao S , Bishay Steven , Popa Otilia , Pirbhoy Patricia S , Binder Devin K , Nelson David L , Ethell Iryna M , Razak Khaleel A 
Published: June 2019

Abstract
Fragile X syndrome (FXS) is a leading genetic cause of autism with symptoms that include sensory processing deficits. In both humans with FXS and a mouse model [Fmr1 knockout (KO) mouse], electroencephalographic (EEG) recordings show enhanced resting state gamma power and reduced sound-evoked gamma synchrony. We previously showed that elevated levels of matrix metalloproteinase-9 (MMP-9) may contribute to these phenotypes by affecting perineuronal nets (PNNs) around parvalbumin (PV) interneurons in the auditory cortex of Fmr1 KO mice. However, how different cell types within local cortical circuits contribute to these deficits is not known. Here, we examined whether Fmr1 deletion in forebrain excitatory neurons affects neural oscillations, MMP-9 activity, and PV/PNN expression in the auditory cortex. We found that cortical MMP-9 gelatinase activity, mTOR/Akt phosphorylation, and resting EEG gamma power were enhanced in CreNex1/Fmr1Flox/y conditional KO (cKO) mice, whereas the density of PV/PNN cells was reduced. The CreNex1/Fmr1Flox/y cKO mice also show increased locomotor activity, but not the anxiety-like behaviors. These results indicate that fragile X mental retardation protein changes in excitatory neurons in the cortex are sufficient to elicit cellular, electrophysiological, and behavioral phenotypes in Fmr1 KO mice. More broadly, these results indicate that local cortical circuit abnormalities contribute to sensory processing deficits in autism spectrum disorders.