bluuebunny/crossref_metadata_2025_split huggingface dataset:
Monoclinic–triclinic phase transition induced by pressure in fergusonite-type YbNbO4
Authors: Garg A B , Liang A , Errandonea D , Rodríguez-Hernández P , Muñoz A 
Published: February 2022

Abstract
We have carried out a high-pressure study on monoclinic fergusonite-type YbNbO4. Synchrotron powder x-ray diffraction experiments and density-functional theory simulations have been performed. We found a gradual increase of symmetry under compression, with calculations predicting a second-order monoclinic–tetragonal transition at 15 GPa. However, experiments provided evidence of a transition at 11.6 GPa to a triclinic structure, described by space group

P

1

¯

. The appearance of the triclinic phase, which according to calculations is dynamically unstable under hydrostatic conditions, seems to be related to the presence of non-hydrostatic stresses. The triclinic high-pressure phase remains stable up to 31.9 GPa and the phase transition is not reversible. We have determined the pressure dependence of unit-cell parameters of both phases and calculated their room-temperature equation of state. For the fergusonite-phase we have also obtained the isothermal compressibility tensor. In addition to the high-pressure studies, we report ambient-pressure Raman and infrared spectroscopy measurements which have been compared with density-functional theory calculations.
Research on angle sensitivity of the boron-lined multilayer converter neutron detector
Authors: Deng Chao , Liu Fule , Wang Qibiao , Tuo Xianguo , Peng Shuming , Wu Yang , Yang Hongchao , Dai Heng 
Published: February 2022

Abstract
In our previous work, a new design for a gaseous neutron detector composed of a boron-lined multilayer converter was proposed to replace the 3He proportional counter, and a prototype detector was constructed to test its performance and characteristics. The neutron detection efficiency varies for different incident angles of neutrons to the converter surface, mainly due to the effective area of the converter and the emitting probability of the alpha and 7Li. Hence, the variation of detection efficiency with the incident angle is analyzed theoretically in this work, and then the GEANT4 simulations and preliminary experimental tests are conducted to verify the calculation results. The highest detection efficiency is obtained at 1.72° (100 mm length, 3 mm gap, and θ = atan (3/100) ≈ 1.72°), the detection efficiency decreases sharply when the angle approaches 0°, and the detection efficiency decreases gradually when the incident angle is larger than 1.72°. The simulation results and experimental results are consistent with the trend of theoretical calculation. Therefore, the proposed detector is suitable for angle-sensitive applications, such as small angle neutron scattering and locating the isotopic neutron sources.
Comparison of volume measurements of mass standards at low pressures and in liquids
Authors: Zůda Jaroslav 
Published: February 2022

Abstract
The determination of the volumes of mass standards is key to the precise determination of their masses, due to the effect of the air buoyancy force. The buoyancy force can either be reduced by mass determination at low pressure or enlarged for a determination of the apparent mass using a vessel filled with liquid. The standard method for the volume calibration of weights is comparison in liquid, as described in the document OIML R111. This report presents the results of calibrating the volumes of stainless-steel mass standards with a nominal mass of 1 kg at low pressure and in a liquid. The authors showed that both methods produced comparable results with maximum differences of 0.002 cm3 when adjusted for a standard temperature of 20 °C. The typical uncertainty in the volumes given by both methods is 0.002 cm3. A major source of uncertainty is the volume of the reference weight. The authors conclude that both methods produce consistent results, so that the method of volume calibration at low pressure can be used instead of hydrostatic weighing. The advantage of this approach is that both the masses and volumes of the weights are measured using the same mass comparator, which requires less manipulation. This study will help to establish the procedures for the dissemination and transfer of the mass unit from vacuum to ambient conditions in the institute of the author.
An all-fiber diaphragm-based extrinsic Fabry–Perot sensor for the measurement of pressure at ultra-low temperature
Authors: Zhang Yutong , Jiang Yi , Cui Yang , Feng Xinxing , Hu Jie 
Published: February 2022

Abstract
An all-fiber diaphragm-based extrinsic Fabry–Perot interferometer (EFPI) sensor for the measurement of pressure at ultra-low temperature is proposed and experimentally demonstrated. The sensor head is manufactured at the end of a single mode fiber with a micro hole and a fiber diaphragm. By femtosecond (fs) laser micromachining, sensors with different sensitivities can be fabricated with different diameter of the micro hole and different thickness of the diaphragm. The deformation of the diaphragm has a linear relationship with the applied pressure. This EFPI is used to measure the pressure at temperature of −196 °C by monitoring the cavity length of the interferometer. Experiment results show the sensor exhibits good linearity within a pressure range from 0 to 7 MPa, and the pressure sensitivities at −196 °C during the process of pressure increasing and decreasing are 111.17 and 111.22 nm MPa−1, respectively. The proposed all-fiber pressure sensor can find applications in ultra-low temperature environment.
State-of-the-art nanotechnologies used in the development of SARS-CoV-2 biosensors: a review
Authors: Lee Dongtak , Lee Taeha , Hong Ji Hye , Jung Hyo Gi , Lee Sang Won , Lee Gyudo , Yoon Dae Sung 
Published: February 2022

Abstract
The coronavirus disease (COVID-19) pandemic has spread to nearly every corner of the globe, significantly impacting economies and societies. Despite advances in detection technologies that target viral pathogens, all countries are facing an unprecedented need to perform biosensing in a rapid, sensitive, selective, and reliable way to deal with global and urgent problems. To date, the reverse transcription-polymerase chain reaction has been the gold-standard method for COVID-19 diagnosis. However, it requires complex facilities and elaborate training and is hampered by limited testing capacity and delayed results. Herein, we review state-of-the-art research into point-of-care biosensors for early severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) detection. We include a general description of the nanotechnological techniques used to develop biosensors, along with the latest research into various biosensors for SARS-CoV-2 detection and a summary of their limitations for practical use. Finally, we discuss future perspectives and directions. This critical review offers the biosensor community insight into how to progress the present research, which may streamline the removal of the problems facing rapid and large-scale SARS-CoV-2 screening.
Comparison of electrical characteristics of Schottky junctions based on CdS nanowires and thin film
Authors: Dang Hongmei , Ososanya Esther , Zhang Nian 
Published: February 2022

Abstract
CdS nanowires and film Schottky diodes are fabricated and diode properties are compared. Effect of SnO2 on CdS film diode properties is investigated. CdS film/Au on 100 nm SnO2 substrate demonstrates like-resistor characteristics and increase in SnO2 thickness corrects resistor behavior, however the effective reverse saturation current density J
o is significantly high and shunt resistance are considerably low, implying that SnO2 slightly prevents impurities migration from CdS films into ITO but cause additional issues. Thickness of CdS film on diode properties is further investigated and increasing CdS film thickness improved J
o by one order of magnitude, however shunt resistance is obviously low, suggesting intrinsic issues in CdS film. 100 nm CdS nanowire/Au diodes reduce J
o by three orders of magnitude in the dark and two orders of magnitude in the light respectively and their shunt resistance is significantly enhanced by 70 times when comparing with those of the CdS film diodes. The wide difference can be attributed to the fact that CdS nanowires overcome intrinsic issues in CdS film and thus demonstrate significantly well- defined diode behavior. Simulation found that CdS nanowire diodes have low compensating acceptor type traps and interface state density of 5.0 × 109 cm−2, indicating that interface recombination is not a dominated current transport mechanism in the nanowire diodes. CdS film diodes are simulated with acceptor traps and interface state density increased by two order of magnitude and shunt resistance reduced by one order of magnitude, indicating that high density of interface states and shunt paths occur in the CdS film diodes.
Determination of the band gap of germanium and silicon using ExpEYES-17 kit
Authors: Biswas Subhrajyoti 
Published: February 2022

Abstract
In this article we present a simple experimental set-up to determine the band gap of germanium and silicon using the ExpEYES-17 kit. The experiment is based on the temperature dependence of the reverse current through germanium and silicon diodes at different temperatures. The experimental values are found to agree well with accepted values.
Elongation effect on the recorded moving bar analysis using Tracker
Authors: Santosa I E 
Published: February 2022

Abstract
The image of free-falling bar has been recorded to study the effect of the motion on its observed length. This moving bar image is analysed using the Tracker software to determine its length and the end bar’s position. An elongated appearance of the bar has been observed with movement. This effect relies on the speed and the exposure time during image recording. When recording at 25 fps with exposure time of 0.04 s, the 33 cm bar’s apparent size becomes (54.4 ± 0.6) cm at speed of 5.88 m s−1. The elongation is shorter with a shorter exposure time.
Enhancing sustainability and elasticity of synthetic fibers by tandem repeat proteins
Authors: Dursun Burcu , Mazeed Tarek El-Sayed , Colak Oguzhan , Boy Ramiz , Demirel Melik C 
Published: February 2022

Abstract
Protein fiber production in heterologous organisms, such as bacteria, provides a new possibility for engineering high-performance materials and composites. The discovery and design of sustainable materials that are biological or inspired by biological principles are essential for the development and production of the next generation of circular bioeconomy. Here, we created a hybrid of biological and synthetic materials by combining bio-engineered proteins with synthetic acrylic polymers to enhance the sustainability and elasticity of the blend fibers. First, we developed an optimized expression (i.e. yield exceeding 1 g l−1) and purification method (>80% purity) for squid ring teeth inspired by tandem proteins at the facility scale. We showed that our protein-based powder, produced via industrial fermentation, can be manufactured into braided yarns with acrylic using wet-spinning. Our fibers have enhanced elasticity when hydrated due to the hydrogen network between the protein and acrylic fibers.
Short wavelength infrared InPSb/InAs superlattice photodiode grown by metalorganic chemical vapor deposition
Authors: Zhu Hong , Zhu He , Liu Jiafeng , Hao Xiujun , Teng Yan , Huai Yunlong , Li Meng , Liu Zhen , Huang Yong 
Published: February 2022

Abstract
We report the growth and characterization of InPSb/InAs superlattice (SL) materials and devices in the short-infrared wavelength range by metalorganic chemical vapor deposition (MOCVD). Good structural quality was achieved with a lattice mismatch of less than 0.09% and smooth surfaces with a roughness of only 0.304 nm. A pin homojunction photodetector with 10 monolayer (ML) InPSb/2 monolayer (ML) InAs SLs on InAs substrate was grown and fabricated. At 77 K, the device demonstrated a 100% cut-off wavelength of ∼2.6 μm, a dark current density of 8.7 × 10−10 A cm−2 at −0.1 V bias voltage, and a specific detectivity of 1.3 × 1013 cm·Hz1/2/W at 2.0 μm.
Conceptual design of the ALIANCE-T mirror experiment
Authors: Yakovlev D. , Chen Z. , Bagryansky P. , Bragin A. , Kotelnikov I. , Kuzmin E. , Prikhodko V. , Shikhovtsev I. , Usov P. , Wang Z. , Zeng Q. , Dong L. , Zhang K. , Ivanov A. , Yu J. 
Published: February 2022

Abstract
The paper describes the conceptual design of a small-scale experiment within the fusion neutron source project ALIANCE (Axisymmetric LInear Advanced Neutron sourCE). The experimental machine is an axially symmetric magnetic plasma trap with a high mirror ratio, which focuses on the physical and engineering problems of mirror-based gasdynamic neutron sources. The specific research topics covered include the magnetohydrodynamic (MHD) stability of plasmas with high mirror ratios, the operation of the electrodes used for plasma stabilization, and problems related to particle and energy transport. ALIANCE-T features superconducting mirror solenoids that enable it to reach mirror ratios of ∼100 and a helicon plasma source with a power of up to 25 kW installed directly in the confinement zone between the mirrors. The expected plasma parameters are estimated using a simple analytical model, which takes into account gasdynamic axial plasma losses, cross-field transport, and the interaction of the plasma with neutral gas. It is projected that the machine will simultaneously achieve a plasma density >1013 cm−3 and a temperature >10 eV in a continuous discharge lasting for 1–8 h. This paper gives a detailed description of the key machine subsystems and introduces the analytical model used for calculation of the plasma parameters.
Comparison of voltage drop in AC and DC shipboard electrical power distribution systems: A case study of 17,500 DWT tanker vessel
Authors: Kurniawan Akhmad R. , Kurniawan Adi , Sarwito Sardono , Gumilang Ahlur R.N. , Budianto Firman 
Published: February 2022

Abstract
The recent emergence of power electronics equipment raises the possibility of implementation of DC shipboard electrical distribution systems. Several investigations on the effectiveness of DC shipboard electrical power distribution systems have proven that it is more profitable than AC distribution systems both in technical and economical aspect. However, known investigations are still limited to the system in ship with electric propulsion, which the consumption of electric power is enormous. The current study investigates the technical performance of both distribution systems in a non-electric propulsion ship, especially in the aspect of power losses. Both of the original AC distribution systems in a 17,500 DWT tanker ship and its equal DC distribution systems are modelled in a computer simulation program. The electric power flow simulation for both models are performed with the data of electric load during operating conditions, to compare the power losses in the distribution systems. The results show that the DC distribution systems has fewer drop voltage than its AC counterpart.
Design and finite element analysis of gondola construction for multibeam echosounder (MBES) installation on RV Baruna Jaya III - BPPT
Authors: Putra Arfis Maydino Firmansyah , Fuad Nur Muhamad , Handoyo Tris 
Published: February 2022

Abstract
The revitalization of hydrographic equipment at the Research Vessel (RV) Baruna Jaya III has been carried out by the Technology Center for Marine Survey (BTSK) – BPPT to improve its service capabilities. A Multi-Beam Echosounder (MBES) for the deep-sea mapping up to 8000 meters depth has been chosen to replace the existing equipment which only has a mapping capability of 3000 meters depth. MBES requires a support construction mounted on the vessel hulls as its housing, considering the installation principle from both the shipowner and MBES maker. In this research, a gondola installation principle has been agreed to develop. The gondola construction has been designed in consideration of actual vessel conditions and several requirements by the MBES maker. The design construction is further analyzed using the finite element method (FEM) to ensure its strength and safety and meet Indonesian Classification Society (BKI) minimum requirements. The analysis conditions are divided into 3; hydrostatic load (A), sensors load (B), and the combination of hydrostatic and sensor load (C). The von Mises stress was obtained from finite element analysis for conditions A, B, and C, respectively, 164 MPa, 1.552 MPa, and 160.8 MPa. The analysis results in all loading conditions have met the minimum allowable stress required by Indonesia Classification Society rules, which is 180 MPa. In conclusion, the design of the gondola construction for MBES installation on RV Baruna Jaya III has good structural strength and safety, so it is feasible to use.
Fatigue Life Prediction of Mooring Line on Indonesian Tsunami Early Warning Systems (Ina-TEWS) Buoy
Authors: Priohutomo Kusnindar , Nugroho Wibowo Harso , Arianti Erdina , Priatno Dany Hendrik 
Published: February 2022

Abstract
Ina-Buoy Gen 3.1 is one of the application of the program that has been developed by BPPT (Agency for the Assessment and Application of Technology) in order to reduce the risk of a tsunami disaster in Indonesia. This Indonesian Buoy for Tsunami Early Warning System (INATEWS - Buoy) consists of a tsunami buoy, an ocean bottom unit (OBU), a satellite and a ground station. This paper discuss about calculation of fatigue life due to wave loads for the mooring line that used to hold the buoy position in the sea. A taut mooring system is applied to the buoy until sinker at seabed. Calculation of operational tension at mooring line obtained using numerical simulation fully licensed software Orcaflex ver 11 owned by Centre Technology for Maritime Industrial Engineering (PTRIM), BPPT with wave input of Hs=2.5m and Tp=10.5sec. The depth of sea is varied at 2088m (Sunda Strait), 3563m (Cilacap Sea) and 4082m (Bali Strait). By knowing those tension forces, stress at time history on the mooring line can be obtained. This stress time history is then applied to Palmgren – Miner formula that based on SN-Curve of the mooring line material to predict the life of the mooring line. By applying a safety factor of 2.5 it is found that the fatigue life of the mooring line at water depth of 2088m in Sunda Strait is 6,9 years, then, at water depth of 3563 m in Cilacap Sea is 15,8 years, finally at water depth of 4082 m in Bali Strait is 10 years.
The development of internet-of-things (IoT)-based safety monitoring system in north sea madura
Authors: Maulidi A , Irmiyana T , Ilman A F , Annafiyah  , Kuzzairi  
Published: February 2022

Abstract
Internet of Things (IoT) is a concept where an object has the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction, used in the navigation and monitoring systems for ships safety. This monitoring system receives data from the AIS Transceiver, the equipment installed, and integrated with the ship’s network infrastructure. The equipment transmits signatures tracking the ships sailing and going ashore as the AIS Receiverreceives them. By the increasing number of ships transporting fuels and natural gas from mine-producing areas in the north sea Madura, passenger and cargo ships heading to Surabaya port. The development of an IoT-based monitoring system is prominent, it will ease to monitor the movements of ships. It may also become the basis for further developing ships monitoring systems to improve safety operating in the north sea Madura. In the initial system design, the system can transmit and receive static data, such as ships’ID and names. Then it can transmit and receive dynamic data, such as the ships’ geographical coordinate, to identify marine traffic around the areas. Later, this system could be developed so that it not only collects data but also proceeds the data to analyze the ships condition.
Structural Analysis of Floating Net Cage Bracket in Current and Wave
Authors: Syalsabila F , Prastianto R W , Hadiwidodo Y S , Adaalah A H , Syarifudin M R 
Published: February 2022

Abstract
Aquaculture becomes an important industry and associates with many targets of sustainable development goals. As the aquaculture industries go forward offshore, the design of the floating net cage must be able to withstand extreme sea conditions. One of the vulnerable parts of floating net cage is the floater, especially at the bracket. There is load transfer in the bracket from net drag force, mooring tension, and horizontal force of the wave. Thus, this study aims to analyze the bracket under current and wave using the finite element method. Hydrodynamic force is based on the Morison formula. The numerical model was validated with the data obtained from corresponding experimental and numerical tests. On the basis, using the environmental condition in Pangandaran, Indonesia, the structure is simulated globally to obtain the deformation and tension. The simulations of the fish cage consist of single and double pipes. Then, the bracket at the floater will be analyzed locally to get the deformation and stress distribution. The maximum stress occurs at the connection between the horizontal and outer pipe of the bracket.
Strength Analysis of Offshore Aquaculture Net Structure Under Wave and Current Loads
Authors: Syarifudin M R , Prastianto R W , Hadiwidodo Y S , Adaalah A H , Syalsabila F 
Published: February 2022

Abstract
One of the main problems of floating net cages when operating is the escape of fish caused by breaking or tearing of the net. This is due to the influence of environmental loads that have been studied by several researchers. However, the influence of fish on net strength has not been considered. The schooling of fish in the cage can make the hydrodynamic flow change downstream of the cage. The collision of fish in groups on the net can increases 10–28% of the environmental load received by the net. Besides, fish bites on the net reduce the net cross-sectional area and lead to axial stiffness reduction. So, this study focuses on the analysis of the net strength to determine the net maximum tension, deformation, and the location of each parameter by considering the influence of fish in the net cage Simulations are conducted out using finite element method software with cage models based on physical and numerical experiments from prior studies. The results show that the net could withstand operating conditions. Meanwhile, in extreme conditions, the net could only survive in the 0° loading direction. The largest deformation reached 2.5 times the diameter of the cage. The collision of fish in groups on the net showed that the tensile force increased significantly when adding stress loading factor. While the effect of fish bites showed that the tensile force significantly decreased on all threads with a reduction in cross-sectional area.