bluuebunny/crossref_metadata_2025_split huggingface dataset:
Generation of Q-switched Erbium-Doped Fiber Laser Using Titanium Dioxide Film Based Saturable Absorber
Authors: Ahmed N , Kamarulzaman NH , Zulkipli NF , Jusoh Z , Rahman HA , Harun SW 
Published: July 2020

Abstract
This work demonstrates a generation of a passively Q-switched erbium-doped fiber laser with titanium dioxide (TiO2) film as saturable absorber. The film is fabricated using a ratio of 2:1 by embedding the rutile nanoparticles (TiO2) into a polyvinyl alcohol (PVA) host film. Short after placing the SA film on the fiber ferrule, a stable 1563.3 nm pulses appeared at a power pump range from 104.62 mW to 145.83 mW. The maximum output power was recorded at 2.05 mW, inducing a maximum pulse energy of 22.63 nJ. The repetition rate shows an increasing trendline from 81.04 kHz to 90.58 kHz while the pulse width decreases from 5.08 μs to 4.12 μs. The high signal to noise ratio (SNR) of 63 dB indicates that the TiO2 film has a good performance in generating pulsed laser at 1550 nm wavelength.
Passively Q-switched Erbium-doped Fiber Laser using Tungsten Disulfide deposited D-shaped Fiber as Saturable Absorber
Authors: Omar S , Musa B , Jusoh Z , Ali MIM , Jafry AAA , Harun SW 
Published: July 2020

AbstractThis paper generates a stable Q-switching output wavelength 1560 nm by utilizing tungsten disulfide (WS2) as saturable absorber on D-shaped fiber in erbium-doped fiber laser. D-shaped fiber was prepared by using polishing wheel technique with rough and fine polishing is conducted to ensure efficient light-matter interaction inside D-shaped optical fibre. Proposed Q-switched erbium-doped fiber laser generates shortest pulse duration of 3.25 μs with repetition rate of 108.90 kHz. Q-switched generated was stable under pump power of 84.02 mW to 182.92 mW. Obtaining signal-to-noise ratio of 40.58 dB, Q-switched induced contain pulse energy of 14.60 nJ with output power of 0.64 mW to 1.59 mW. Therefore, proposed D-shaped fiber-WS2as saturable absorber was stable and efficient for making a portable laser source based on Q-switched.
Thermal Transport Feasibility of (Water + Ethylene Glycol)-Based Nanofluids Containing Metallic Oxides: Mathematical Approach
Authors: Alawi Omer A , Mallah A R , Kazi S N , Zubir M N M , Oon C S 
Published: July 2020

Abstract
A mathematical approach was used to predict the heat transfer performance of CuO nanoparticles with three different filling ratios [DW], [DW70:30EG] and [DW50:50EG]. There was a discussion on the thermophysical properties. Thermal diffusivity, Prandtl member and pumping power were predicted to find the optimal filling ratio. The effect of nanoparticle shapes on the thermal conductivity and dynamic viscosity was examined. The base fluid of [DW50:50EG] showed significant improvement while DW was optimal for thermal conductivity. Higher thermal conductivity was achieved by DW-based spherical nanofluids, while [DW50:50EG]-based platelets nanofluid showed the best improvement in dynamic viscosity. By increasing the temperature, thermal diffusivity increased while the Prandtl number decreased. The loading of nanofluids did not require more power consumption, and the relative pumping power was less than 1.
Microsecond Pulse Generation using Bismuth Salenide as Saturable Absorber in 1.5 μm Region
Authors: Yusoff R A M , Jafry A A A , Zulkipli N F , Kasim N , Rifin S N M , Munajat Y , Harun S W 
Published: July 2020

Abstract
A Q-switched Erbium-doped fiber laser (EDFL) was demonstrated utilizing Bismuth Salenide (Bi
2
Se
3) as a saturable absorber. The saturable absorber (SA) is fabricated by mixing directly the Bismuth Salenide (Bi
2
Se
3) into polyvinyl alcohol (PVA) aqueous solution to form a thin film. The SA is integrated into EDFL cavity to achieve a stable Q-switched at center wavelength of 1559.8 nm. The peak power is a steady increasing pattern from 2.52 mW to 3.21 mW as the pump power is increased from 86.1 mW to 116.6 mW. The highest pulse energy obtained was 36.9 nJ at the pump power of 116.6 mW.
Effect of Addition of Chitosan-ZnO as an Antibacterial on The Thermal Stability of PLA-Based Nanocomposites for Biofilm Packaging
Authors: Rihayat T , Riskina S , Nurhanifa  , Syahyadi R 
Published: July 2020

Abstract
This research is about Composite Polylactic Acid with chitosan and zinc oxide reinforcement (ZnO) in the manufacture of packaging biofilms. The purpose of this study is to produce biofilms with good characteristics that can be applied to food packaging. The method used is heating by varying the concentration of chitosan (1, 3 and 6%) and the concentration of ZnO at (1,2,3 and 4%). The resulting biofilm was analyzed by tensile test, thermal gravimetric, and FTIR. The results showed that the optimum tensile strength value obtained at the addition of Chitosan 6% - ZnO 3%, amounting to 1.22 MPa. The functional groups contained with the addition of ZnO and chitosan are functional groups C-H, C = O, O-H, and N-H. Biofilm samples underwent single decomposition with biofilm degradation temperatures ranging from 220-300 °C, the highest On Set temperature was 238.24°C, while the highest End Set was 295.16 °C. ZnO reinforcement added to the resulting composite can increase the tensile strength.
Identification of Potential Distribution of Gold Mineralization Zone of High Sulfidation Epithermal System using Time-Domain Induced Polarization (TDIP) and Magnetic Method at “N” Mountain Qrea
Authors: Khoir M F , Rosid M S 
Published: July 2020

Abstract
The high gold commodity as well as the Pongkor production field that has existed since decades ago made it necessary to find a new potential zone for gold mining production. To find out the zone of gold mineralization and its continuity, geophysical studies then conducted by using the methods of Time-Domain Induced Polarization (TDIP) and magnetic. TDIP data consisting of resistivity and chargeability data are interpreted to determine alteration zones and subsurface mineralization that are correlated with magnetic data that has been inversed in 3D to obtain susceptibility parameters. Based on the value of resistivity in the study area, the argillic alteration zones are thought to has a value of < 50 Ohm.m. Silicification alteration zones supposedly have the value > 50 Ohm.m. The value of the chargeability at the mineralized zone indicated has a value of 100-810 msec. Also, study in the area of the mineralized zone have a susceptibility value in the range of -0.073 to -0.021 cgs. From that parameter of the mineralized zone, it is assumed that the mineralization zone is in the eastern part of the study area and oriented North-South direction with the orientation of the main fault.
Mapping of basement layer in field “X” petroleum system using ESA – MWT technique gravity data
Authors: Rosid M S , Andrian J 
Published: July 2020

Abstract
Land gravity data acquired over part of North Sumatera Basin, Indonesia, was used to estimate depth to multiple horizons of density interface. Recently, gravitational data has difficulty to map the depth of subsurface layer structure except by using modeling. Here, we apply the energy spectral analysis-multi window test (ESA–MWT) technique to map the subsurface horizons. The estimated depth was computed from energy spectral analysis as the transformation of the gridded gravity data to 2D Fourier transform (Fast Fourier Transform). The energy spectrum analysis is performed at a test point by windowing the gridded complete Bouguer anomaly (CBA) at that test point with the square window size constantly increasing 1 km width from the previous window size. The distance between the test points is about 2 km on each of the gravity measurement lines. Plateau depths are then obtained which represents the density interfaces of the plot result between the depths of the anomaly to the window size. The results of the mapping of density interfaces correspond to sedimentary interfaces, those are the economic basement as Top Tampur Formation (Horizon 1), the top of several other sedimentary interfaces (Horizon 2-6), one of them is Top Belumai Formation (Horizon 2).
Simulation of proppant flowback from hydraulic fractures
Authors: Verisokin A E , Yu Serdyukov D , Vasil’yev V A , Gun’kina T A , Shesterikova R E 
Published: July 2020

Abstract
Hydraulic fracturing has become one of the main and most effective methods of intensifying oil production. A method of bench-scale study with the use of modern measuring equipment, automation of experimental variable measurements according to specified algorithms ensuring high-level works was developed in order to obtain reliable data on proppant migration in a fracture. The laboratory facility makes it possible to determine the speed of proppant flowback from a fracture, proppant permeability depending on layer elevation. The tests show the nature of permeability change as the pressure increases. The conditions under which the height of a filling layer varies depending on pressure were identified. The test bench greatly facilitates and accelerates the experiments. The use of modern information and measurement systems makes it possible to significantly increase the volume of received information and improve its quality. The use of experimental results obtained through hydraulic fracturing will allow for additional increase in hydrocarbon production.
Energy-efficiency measures of oil and gas industry building using optimum conditions of faltering heating
Authors: Osintsev K V , Korabelnikova D P , Pshenitsyna T A 
Published: July 2020

Abstract
Nowadays the problem of use of energy resources is the most relevant. The actions directed to increase in energy efficiency of use of energy resources at the mining utilities should be developed and introduce to solve this problem. The refusal of the systems of the centralized heat supply and transition to the decentralized systems is offered as the solution of an objective. In the centralized systems, development of warmth is carried out in separate sources. The giving of the heating agent in the systems of heat consumption is taken place through thermal networks. Thermal networks have the considerable extent and diameters at the same time. They are also equipped with thermal points, pump stations, automatic equipment and a control system.
Compensator-vibration isolator
Authors: Vakhitova R I , Saracheva D A , Zaripova Z F 
Published: July 2020

Abstract
Nowadays electrical submersible pump (ESP) units remain the main type of formation fluid production equipment. There may be complicating factors during the operation of oil production wells equipped with such units. Complicating factors include the fall of the submersible unit downhole to the bottom of the production well. The damage from such falls is great. Despite the accumulated experience in this area, effective solutions need to be developed. In the work, the sources of vibration in the ESP are noted, and the places of breaks in the unit are indicated. The reasons for the occurrence of vibration processes in a submersible unit are summarized. The authors propose a design of a compensator intended for quenching vibration energy in a submersible unit. To evaluate the effectiveness of the compensator as part of an ESP unit, tests on industrial sites were conducted. At Open Joint-Stock Company Alnas, the test stand was a vertical well. Tests in Almetyevsk Central Base of Electric Submersible Production Service were carried out on a horizontal test stand section by section. Analysis of the results of the tests showed that the use of a compensator can reduce vibration levels.
IoT-Based Smart Home Controller Using NodeMCU Lua V3 Microcontroller and Telegram Chat Application
Authors: Findawati Yulian , Idris Achmad , Suprianto  , Rachmawati Yunianita , Suprayitno Eko Agus 
Published: July 2020

Abstract
The house is a valuable asset that needs to be guarded, not infrequently some people experience undesirable things happening in the home environment, these things include fires and theft. Anticipation is not just enough by manually such as locking the door, or preparing fire extinguishers, in addition to the manual way of anticipation can be added by automation, namely by installing devices that can monitor the condition of the house and also can control electrical equipment in the house. The automation tool intended in this study is an IoT-Based Smart Home Controller Using the NodeMCU Lua V3 Microcontroller and Telegram Chatting Application. The use of automation systems like this is an option to be implemented because it saves power and the price is relatively cheap. This device / system uses 2 NodeMCU Lua V3 microcontrollers and several sensors (fire sensors, motion sensors, temperature and humidity sensors) and also this role utilizes the 4 Chanel Relay Module which functions as a switch to turn off or turn on electrical equipment in the home. The control function of the smart home controller device also utilizes the Telegram chat application bot that is planted on an IoT-based system device with the function of receiving commands from users through the Telegram chat application to monitor the condition of the house and also controls the relay module used as a switch of equipment.
Smart Home Integrated With Internet Of Things (Iot) In The Digital Era Of Industry 4.0
Authors: Suprayitno Eko Agus , Anshory Izza , Jamaaluddin  
Published: July 2020

Abstract
Smart Home is one form of technological progress in the Industrial Revolution Era 4.0 that facilitates human activities in controlling and monitoring the condition of the home that is not limited to distance by utilizing electronic equipment, the internet, and smart phones[1]. In this research, a prototype of Smart Home with Internet of Things (IoT) which is equipped with a proximity sensor (HC-SRF04) to open and close the door of the house automatically, a temperature sensor (LM35) in detecting the integrated room temperature on and off based on the fan room temperature, and lights and fans that can be controlled remotely by using the internet and smartphones. Android application to control and monitor homes in Create by using the Blynk application. The Temperature Sensor and Proximity Sensor on Smart Home are tested using Industry standard distance and temperature measuring devices (digital thermometers). The accuracy value of the device reaches 98.22% for distance measurement, and 98.50% for room temperature when compared with industry standard tools. Android applications have been successfully tested in several types of smartphones with different brands and specifications. The distance of the smartphone to the Smart Home location in monitoring and control was successfully tested and worked well at the closest distance of 5 meters to the farthest distance of 17,466 km (State of Mexico), all of which use the Internet.
Analysis of Groundwater Contamination Level in Residential Areas Around Cipayung Landfill Using Ground Penetrating Radar
Authors: Maryadi Maryadi , Supriyanto  , Champai Fira Mariah Sausan , Triananda I Nyoman , Fitriana Desi Nur 
Published: July 2020

Abstract
Cipayung Landfill is the last disposal location of waste processing in Depok City, West Java. In a day, approximately 800 tons of garbage is dumped, which is then processed by being burned and left to decompose for inorganic and organic waste, respectively. However, poor waste management has resulted in an accumulation that continues to this day. This creates a variety of problems, especially leachate contamination that infiltrates to the groundwater, flows along and threaten the health of residents who live in the vicinity. This liquid contains toxins and hazardous materials. Therefore, it is essential for residents to know the level of contamination occurred and its dispersion, along with actions that must be taken to reduce the impact of pollution. In this study, we map the distribution of contaminated groundwater using the geophysical ground penetrating radar method, together with the chemical analysis of water samples. Ground penetrating radar has been useful to detect the change of permittivity and conductivity of layers below the surface. It is possible to mark off the contaminated groundwater to the fresh one indicated from an extensive amount of electromagnetic signal attenuation. This study suggests that there is contamination occurred in radius up to hundreds of meters from the landfill site. The result of this community-based research gives an advisable policy regarding waste management and groundwater usage in this area.
Data Mining Optimization uses C4.5 Classification and Particle Swarm Optimization (PSO) in the location selection of Student Boardinghouses
Authors: Waluyo Ari , Jatnika Hendra , Permatasari Marlina Rahmi Shinta , Tuslaela T , Purnamasari Indah , Windarto Agus Perdana 
Published: July 2020

Abstract
The purpose of this study is to select the location of student boarding houses using Particle Swarm Optimization (PSO) and C4.5 optimization techniques. The source of the data was obtained by observing and giving questionnaires to 150 respondents who were lodging in the Pematangsiantar-Simalungun area. from the data set of 81 records and using 5 parameters of assessment ((C1) water cleanliness, (C2) Facilities, (C3) Transportation, (C4) Security, and (C5) Conditions) obtained the results of modeling using the C4.5 + PSO algorithm has better accuracy is 97.78% compared to the C4.5 model whose accuracy is 97.53%. Thus, it is evident that the PSO applied to the weighting of the C4.5 attribute increases the value of accuracy..
The Rubber Compound Combination To Strenghthen Tire Valve of 80/90 R-14
Authors: Widodo Edi , Suhami Hani , Firdaus Rachmad , Mulyadi  , Fahruddin A’rasy 
Published: July 2020

Abstract
Tires are part of the wheel of the vehicle in direct contact with the road surface. Tires are the basis for supporting vehicle loads. The basic material of the tire is rubber so it has elastic and soft properties, strong but yet susceptible to taper and sharp objects. Minor damage to the tire will cause air leakage, and its can occur in all parts of the tire. This study discusses tire leakage caused by valve damage. Valve damage is caused by high pressure, lack of pressure, inner tire leakage or shock load collision which causes the tire valve to release. Reused tire damaged in the valve section can be repaired with modifications of the worn and damaged valve. The addition of plastic-coated compound to add strength and toughness of the valve, was applied to get the benefits of tire recycling. The added layer includes a plastic layer, compound and balloon layer. The three layers are tested to find out the layer that is able to increase the strength of the valve more significantly. Tire valve pressure testing which is coated with plastic can have greater strength than other composites.
Experimental Study of Blade Angle Effect on Two-Stage Vertical Shaft Hydrofoil Water Turbines on Power and Efficiency
Authors: Santoso A N E B , Fahruddin A , Iswanto  
Published: July 2020

Abstract
The limitations of fossil energy sources are one of the most fundamental energy problems. Therefore, it is necessary to make power plants with alternative sources that are environmentally friendly and affordable. One effort that can be done is using water energy to drive turbines. This study aims to determine the effect of blade angle on the total power and efficiency produced by the hydrofoil water turbine. In this study using a two-stage hydrofoil turbine with NACA 64-212 standard blade. The turbine blade angle is varied by 4, 6, and 8 degrees. Water discharge is varied by 40, 50, and 60 L/s. The results show that the largest total power is 3.046 Watt, achieved at a 4-degree blade angle with a water discharge of 60 L/s. And the highest efficiency is 11.22%, achieved at a 4-degree blade angle with a water discharge of 40 L/s.
The Origin of Specious: misunderstandings about Patrick Matthew’s evolutionary thinking
Authors: Derry J F , Dagg Joachim L 
Published: July 2020

AbstractMany ambiguities in Patrick Matthew’s evolutionary ideas can be resolved upon rejecting the presumption that his mechanism was identical to Darwin’s. This presumption has led to two ingrained interpretations which we show are false. First, competitive natural selection plays no role in Matthew’s lineage splitting. On the contrary, it is absent during his comparably short phases of adaptive radiation occurring after catastrophes. Catastrophes eliminate competition, and the competitive vacuum pulls the surviving species apart and unleashes their indwelling variational force. Separate populations adapt to new circumstances through variation and non-competitive survival. Second, competitive natural selection does not drive Matthew’s lineage adaptation either. When it is active, during the comparably long phases of conformity that follow adaptive radiation, the environment directly leads the system towards adaptation. Lineages adapt to changing circumstances but do not split. Interpreting Matthew’s statements accordingly makes sense of his evolutionary thinking that seemed obscure for over a century, especially his statements about the fixity of species and the species problem.
Why Agential Realism Matters to Social Work
Authors: Webb Stephen A 
Published: July 2020

AbstractThis article is a theory-building exercise, which focusses on Baradian agential realism to build a framework of key concepts and their interrelationships to show how and why this perspective matters to social work. It makes a statement about the relevance of agential realism, in the writings of Karen Barad and other feminist post-humanist thinkers, to rethink fundamental concepts, which are embedded in social work discourse, especially those humanist notions that relate to agency, subjectivity and reflection. It charts how agential realism can become foundational for social work knowledge. The article is intended both as an introduction to the thought of Barad and as a mapping of current agential realist scholarly trajectories. It guides the reader through the conceptual terrain of agential realist thought by explicating the key concepts of intra-action, entanglement, diffraction and agential cuts. In order to furnish an accessible engagement with Baradian theory, the article marshals case studies and references, drawing on ethnographic and qualitative research, which relate to social work. It concludes by showing how agential realism can provide a rich ontological framework for social work and highlights how it disrupts some of our long-held cherished beliefs about what it means to do social work.
A Validated Stability-Indicating Liquid Chromatographic Method for the Determination of Lorcaserin and Related Impurities in DRUG Substance Supported by Quality by Design
Authors: Wani Dattatraya V , Mokale Santosh N 
Published: July 2020

Abstract
Lorcaserin (LOR) is selective and potent antiobesity drug that targets the activation of the serotonin 5HT2C receptor. Here a novel, specific, sensitive stability indicating method was developed and validated for the quantitative determination of LOR and its process-related impurities using quality by design principles. By applying experimental design, the authors examine the multifactorial effect of parameters on the critical resolution pair and generated design space representing the robust design. LOR was subjected to stress condition and found stable at all condition, only found significant degradation at oxidative stress condition. The chromatographic separation of degradation product and its process-related impurities were achieved on a Phenomenox Luna phenyl-hexyl column (150 × 4.6 mm × 5 μm), with mobile phase consisting of 10 mM ammonium formate containing 0.1% ammonia solution; pH adjusted to 2.8 with trifluoroacetic acid as solvent A and methanol/acetonitrile (5/95) as solvent B delivered with gradient program at a flow rate of 1.0 mL/min, column temperature was maintained at 25°C and analytes were monitored at 220 nm. The injection volume was 5 μL. The developed RP-LC method was validated and found linear, accurate, specific, selective, precise and robust. The structure of impurities was confirmed by direct mass analysis.