bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Simulation of a Reverse Flow Reactor for Catalytic Oxidation of Lean Benzene Emissions
Authors: Sophiana Intan Clarissa , Topandi Abdussalam , Culsum Neng Tresna Umi , Budhi Yogi Wibisono 
Published: February 2021

Abstract
This paper deals with reactor design, modeling, and simulation of a pilot-scale reverse flow operation used for catalytic oxidation of lean benzene-air mixtures. The reactor was designed for conducting lean benzene with adiabatic temperature rise less than 54°C. According to the rule of thumb, this kind of condition requires the reaction to be accomplished under reverse flow operation. In the reactor design, some criteria were calculated such as Mears, Weisz-Prater and Ergun’s criteria The reactor model was developed for 1D, pseudo-homogeneous, involving mass and energy balances. The fixed bed consisted of the inert section, placed at the outer part of the catalyst section. The results of the simulation indicated that the switching time, inlet concentration and heat extraction imposed an important influence on the performance of the reactor. Under the suitable operating conditions, the system can achieve a favorable running status, without reactor extinction, and can be operated auto-thermal, in fact, more thermal energy from the catalyst section was feasible to extract. The temperature profile remained smooth and continuous in the case of desired energy extracting from the heat exchanger.
The Effect Of SiO2 / Al2O3 Ratio Over Yield And Particle Size In Zeolite from Geothermal Waste
Authors: Munfarida S , Widayat  
Published: February 2021

Abstract
Hydrogen is one of compound much used in the chemical industry. Production process of hydrogen commonly applied in the industry is steam reforming using high temperatures. Catalyst can be used in the production of hydrogen is zeolite. Zeolites are the result of mine nonmetallic, so the availability is limited. PT Geo Dipa energy unit Dieng produce industrial waste of deposition silica and it can be used as zeolite materials. The objective of this research for preparation of catalyst from solid waste of geothermal industry with varied ratio of SiO2/Al2O3. The geothermal waste was calcined at a temperature of 1000 °C. The waste geothermal was mixed with 400 ml of Sodium Hydroxide 3M and added with Aluminum Hydroxide at 100 °C for two hours. Hydrothermal process was conducted at 300°C for five hours. The calcination of zeolite products for five hours at 700 °C. This research concludes that washed catalyst has a smaller yield than native. The greater ratio of SiO2/Al2O3 gives smaller yield. Catalysts that are washed have smaller particle sizes than without washing. Larger ratio of SiO2/Al2O3, it produces smaller particle sizes. In the analysis using the Particle Size Analyzer method, the resulting particle size is still relatively large at a micro scale.
Biosolubilization of Indonesia’s Subbituminous Coal Using Neurospora intermedia
Authors: Restiawaty Elvi , Sasongko Dwiwahju , Hala Ahmad Furqon , Fauzan Ryan Fitrian Sofwan , Solihah Nendry Nurramdani , Harimawan Ardiyan 
Published: February 2021

AbstractRecognizing its high volatile matter content, liquefaction to convert subbituminous coal with relatively low calorific value into liquid fuel by thermal or biological process has been subjected to extensive research. The former has been implemented commercially whereas the latter challenges for further studies. This paper looks into low-rank coal upgrading through subbituminous biosolubilization usingNeurospora intermediaas the bioconverting agent.N. intermediawas initially cultured on agar medium containing a carbon source (glucose, sucrose, or cellulose) in a petri dish. After four days cultivation, sterilized coal particles with diameter of 1.5-2.5 mm were spread onN. intermediaculture. It was observed thatN. intermediacould grow on the solid culture containing glucose, sucrose, and cellulose. However, the biosolubilization product was only observed from the solid culture with glucose and sucrose as carbon source. The highest biosolubilization rate was 1.07 × 10−3abs/min and about 83% of coal could be solubilized when the media contained 15 g/L of glucose. The FTIR analysis showed that the spectrum of biosolubilization product was similar to the initial coal spectrum, but it contained small amount of aliphatic C-H group compounds and high amount of carbonyl, hydroxyl, and amine groups.
Natural Uranium Utilization in FUJI-U3 Molten Salt Reactor
Authors: Wulandari Cici , Sofyan Asep , Waris Abdul , Permana Sidik 
Published: February 2021

Abstract
Molten Salt Reactor (MSR) is one of the next-generation nuclear power systems known as Generation IV. In this paper, the FUJI-U3 MSR type is designed for neutronic analysis that natural uranium is used as a fuel. The standard reactor core model is adopted due to the flux flattening effect in the active core, as reported from previous research. FLiBe eutectic is used both as the coolant salt and moderator in the reactor core. The neutronic calculation is performed using the SRAC 2006 program: PIJ for pin cell calculation and Citation for core calculation. JENDL 4.0 is used as a nuclear data library that provides the cross-section data of the nuclides. The neutronic parameter results, such as the effective multiplication factor, conversion ratio, neutron spectrum, and power density, are obtained from the calculation. The reactor can achieve the criticality condition with a minimum loading Uranium Tetrafluoride (UF4) of 3.6%mol for 2000 effective full power days (EFPD). The results calculation provide some parameter survey for the research and the future development of MSR.
Validation of helical steam generator design for the experimental power reactor
Authors: Ekariansyah A S , Widodo S , Tjahjono H , Susyadi  , Wahyono P I , Budianto A 
Published: February 2021

Abstract
The steam generator is an important component in any commercial nuclear power plants to deliver required steam from the reactor heat. Different with the steam generator design of PWR, other design in a small modular reactor (SMR) with smaller thermal capacity incorporates the helical-coiled tubes having advantage of additional heat transfer surface to deliver a superheated steam. The purpose of this research is to model the helical-coiled steam generator in the experimental power reactor developed by BATAN using RELAP5/SCDAP/Mod3.4 code as thermal hydraulic code to obtain a validation of technical data in the conceptual design document. After a number of steady-state simulations, operational thermal hydraulic parameters such as outlet helium and steam temperature, tube pressure drop, and heat capacity have been calculated to be close with the design data. It has been found out, that the different heat transfer characteristics in the helical-coiled tubes need to be addressed specifically in the RELAP5 input data by considering the new estimated heat transfer coefficient or by modifying the heat transfer area. In general, the developed steam generator model is ready to be integrated with the experimental power reactor model that can be used for safety anaysis purposes.
Developing Digital Instrumentation and Control System for Experimental Power Reactor by Following IEEE Std 1012 −2004 to be Verified and Validated
Authors: Maerani Restu , Saharudin  , Sudarno  , Santoso Sigit , Deswandri  , Bakhri Syaful , Jung Jae-Cheon 
Published: February 2021

Abstract
We will develop the Experimental Power Reactor of Indonesia (RDE), by adopting the HTR-10 type from Tsinghua University-China. The–Instrumentation and Control (I&C) for RDE will developed with digital system technology which in the development process will have verification, validation, design and implementation, reviews, and audits for digital computer software activities. Software design for I&C system of Nuclear Power Plant (NPP) should be started by developing software requirement specification (SRS) to meet the requirement that systems and components should be designed, fabricated, erected, tested, and inspected. In the regulatory structure of developing nuclear power plant in Indonesia, BAPETEN also concern for the design development of important to safety with computer based system for nuclear power plant (NPP) by PERKA BAPETEN No.6 in 2012. Since BAPETEN did not state which standards should be use, we can refer to the standards that are commonly used globally. IEEE Std 1012™-2004 is recommended by the latest US. Nuclear Regulatory Commission Guide 1.168 in 2013 about verification, validation, reviews, and audits for digital computer software used in safety systems of NPP. This guide also recommends IEEE Std 279, “Criteria for Protection Systems for Nuclear Power Generating Stations,” or in IEEE Std 603-1991, “Criteria for Safety Systems for Nuclear Power Generating Stations. In this research we will examine the recommendation activity that should be follow to meet the requirement of the regulatory body which is also covered in IEEE Std 1012-2004. Developing traceability analysis in the first activity will help the designer to trace the requirement to meet the design criteria and reach the effectiveness and performance of the I&C system. By tracing from the top tier recommendation, it will help the development I&C system of RDE to be verified and validate as the design criteria for HTR-10
Analysis of water ingress accident in the RDE core using MCNPX
Authors: Taryo T , Zuhair  , Setiadipura T , Suwoto  , Kuijper J C 
Published: February 2021

Abstract
The 10 MW Indonesia’s Reaktor Daya Eksperimental (RDE) is a Pebble Bed High Temperature Reactor-type and to be constructed in Serpong Nuclear Zone, Puspiptek, Indonesia. The reactor applies helium gas coolant, graphite moderator, and low uranium enriched fuel (17%). A water-ingress accident may take place in the RDE core and such the accident is caused by a pipe break in the steam generator system of the reactor and hence the accident influences the reactivity of the core. To begin with, an initial core of the RDE should be modelled and the model contains the identification of material zones in the reactor core. To estimate the reactivity change due to the water-ingress accident in the initial RDE core, a void core condition from any coolant should be firstly deliberated. The core reactivity change is then estimated based on effective multiplication factor (k
eff) as a function of water density which comes into void cells among pebble containing helium coolant in the RDE core and that of the variation of 235U enrichment. The data library of thermal scattering S(α,β) as a function of temperature has been applied. The data base of thermal scattering for graphite was also utilized to comprehend the validity calculation using MCNPX. The ENDF/B-VII continuous energy nuclear data library was also smeared for all calculations at temperature of 900 0K. For the calculation using MCNPX, two options of KCODE and KSRC were taken into account to estimate k
eff of the RDE core. To achieve the accuracy of keff in the RDE reactor core, the amount of 20,000 neutrons per cycle for 150 non-active cycles and 650 active cycles was taken into account. The results showed that water-ingress accident in the RDE core is a dynamical behaviour which may result in reactivity core change of the RDE core. Finally, from all caclulated results taking into account the varietes of water density and 235U fuel enrichment, the RDE reactor core is totally safe in the event of water-ingress accident ensuing during the RDE reactor operation.
Development of responsive well plugging material in carbonate reservoir
Authors: Zhou T , Liu J T , Kong X J , Qian F , Li W J , Zhong Z , Jing N , Feng J , Zheng Q , Gu Y X , Li J Y , Li Y Y , Shi X , Sun Y D 
Published: February 2021

Abstract
One of the most critical problems limiting the exploration and development of the Central Asia and Middle East Areas is lost circulation caused by the natural fracture propagating in carbonate reservoir. Traditional plugging materials had limited performance due to poor adaptability to carbonate formation. This paper investigated the mechanism of lost circulation in Central Asia and Middle East Areas, and a new responsive fracture plugging materials was developed. After implementation, the complexities treatment time was shortened and drilling efficiency was increased. The main types of lost circulation mechanism are summarized and analysed by studied the reservoir characteristics of Central Asia and Middle East Areas. A physical model of horizontal V funnel leakage channel in the target block was established to simulate the migration and plugging process of plugging particles in natural fractures. Based on the analysis of the flow and accumulation pattern of the plugging fluid in the leakage channel with different aperture ratio, a statistical model of the particle flow in the plugging material was established. A response controllable solidification plugging material was developed. The application results show that, the responsive solidification controllable well plugging material could rapidly accumulate in the 1mm and 3mm fractures in the upper sealing formation. The mud cake has good toughness with compressive strength of 3.4-9.5MPa, which achieves a rapid and high-strength plugging for the fracture formation. The acid soluble consolidation plugging material, mainly composed of curing agent, retarder, suspending agent, etc., is developed for long open hole section. The dissolution rate could reach up to 91%, the plugging strength of the solidified plug is up to 10MPa and which could be stable for 15d under 150°C. This innovative anti-lost circulation materials for carbonate reservoirs can effectively solve the problem of serious loss of production due to sever lost circulation problem in the Mishrif reservoirs of Central Asia and the Middle East and enhance the drilling of complex carbonate oil and gas fields. The implementation of this plugging material improves the technical level of drilling and completion of complex carbonate oil and gas fields and provides strong support for exploration and development in Central Asia and the Middle East.
Overview of suspension system dynamics analysis
Authors: Zhang H Y , Cheng Z G , Han B H 
Published: February 2021

AbstractThe control strategy of vehicle suspension system model has been gradually transferred to the modern control optimization algorithm, and the traditional suspension has gradually been unable to meet the vehicle’s pursuit of high performance. Starting from vehicle modal analysis, the development status of suspension model building method, category and control strategy is described respectively. On this basis, the current development difficulties and trends are analyzed.
Parametric modeling program of single-layer spherical reticulated shell structure and prediction program of global stability ultimate bearing capacity
Authors: Qi H , Wang X R , Huang Z Y , Dai X Y , Zhuang J Z 
Published: February 2021

Abstract
In this paper, the “battery” program was compiled based on the parametric tool Rhino+Grasshopper and the parameterized modeling function of K-type single-layer spherical reticulated shell structure was realized. At the same time, based on BP neural network algorithm and considering the complex mapping relationship in nonlinear analysis, a neural network model and program was established to predict the ultimate bearing capacity of K8 single-layer spherical reticulated shell structure. The results show that the program can realize the modeling process efficiently and the reliability of the neural network to predict the ultimate bearing capacity of single-layer reticulated shells is verified, which provides an effective tool for improving the parametric modeling and structural optimization of single-layer reticulated shell structure.
Microstructure and mechanical properties of gas metal arc welded AISI 430/AISI 304 dissimilar stainless steels butt joints
Authors: Serіndağ Hüseyin Tarık , Çam Gürel 
Published: February 2021

Abstract
Nowadays, there is an increasing demand for the use of joining dissimilar metals in various industrial applications owing to the economic benefits and better joint performance. Ferritic stainless steel grades is a good alternative for austenitic ones in several applications as they display higher ductility and strength as well as better corrosion resistance in chloride environments. However, the poor ductility and low impact toughness of ferritic stainless-steel welded joints limit their wide-spread application. Thus, the demand for joining dissimilar ferritic and austenitic stainless steels is ever increasing in several engineering applications in various industries such as nuclear power plants, coal fired boilers, automobile manufacturing industry, chemistry and petro-chemistry industries, etc. Therefore, successful joining of these two different types of stainless steel grades using conventional fusion welding methods is rather important. In this study, the weldability of AISI 430 ferritic and AISI 304 austenitic steel plates using gas metal arc welding and the effect of heat input on microstructure and the mechanical properties were investigated. For this purpose, AISI 430 and AISI 304 plates with a thickness of 5 mm were joined using different heat input values. The microstructures evolved in the weld region of the joints and their mechanical properties were determined by detailed optical microscopy investigations, micro-hardness measurements and tensile tests. Thus, the influence of the heat input on the weldability of these two different stainless-steel plates using gas metal arc welding was also studied.
Bio-structure on the rachis outer surface of a bird feather
Authors: Zhao Y P , Ji J J , Zhao J S 
Published: February 2021

Abstract
From the perspective of biomechanics, this paper studies the outer surface of the rachis. The bio-structure was determined by microscopy. Finite element analysis was conducted on this bio-structure. The results show that, in the feather, the bio-structure of the outer surface of the rachis consists of the basic unit structure of the hexagonal shape of the edge protrusion and a small number of pentagons. The results of the finite element analysis for the basic geometry structure and flange were the edges of which the main bearing stress sites. The practical reference value was for the determination one of safety-structures.
Thermal performance on the influence of filling ratio of an acetone thermosyphon through numerical modelling
Authors: Wang C , Zhao J , Zhang H , Qin Y J , Shen X Z 
Published: February 2021

Abstract
A comprehensively numerical model is established to simulate the phase change in the evaporator section and condenser section in a two-phase closed thermosyphon (TPCT). Combination of Volume of Fluids (VOF) method and an user-defined function (UDF) sources is utilized to simulate the details of flow behaviors and heat transfer phenomena during heat and mass transfer inside the closed chamber. In order to investigate the effect of filling ratio of boiling pool, 50%, 75% and 100% filling ratio are obtained. The displayed contours are analyzed in the light of phase volume fraction, the vapor generation and falling droplets along the thermosyphon. Moreover, the thermal resistance and temperature distribution are conducted to investigate the thermal performance of liquid flow at the end of 10s. It is found that the thermal performance of TPCT reaches the best with 0.78K/W thermal resistance and smooth temperature distribution when the evaporator section is fully charged with acetone.
Numerical methods to predict vibration serviceability on high frequency stairs
Authors: Andrade P , Santos J , Escórcio P 
Published: February 2021

Abstract
With the increasingly deepen knowledge on structural dynamic behaviour, nowadays, monumental staircases and their steps are usually designed with high stiffness and low mass, obtaining high fundamental frequencies, out of the interval of step frequencies excitable by the human walking. However, neglecting the structure’s mass can also result in with high levels of impulsive responses. Furthermore, often the connection between the staircase and its steps experience an almost null rotational stiffness, which can cause local vibrations in steps, where the structural behaviour of two elements is nearly independent from each other. In this scenario, steps will most likely exhibit undesirable vibrations. Hence, intending to improve future designs, this paper compares different numerical methods that can be used to predict human induced vibrations in this type of structures, applying them to a real staircase with a high local liveness. The results showed that the footfall force time histories method could realistically predict the vibrations for almost all tested step frequencies, while the effective impulse could accurately estimate the vibrations for descents at different step frequencies. The walking models defined by Fourier coefficients only generated close vibrations for descents at 3.3 Hz.
High-temperature and room-temperature compression deformation behavior comparing of GH4169 Alloy
Authors: Zhang Y W , Lu X D , Su X , Wen B , Du J H 
Published: February 2021

Abstract
The hot deformation characteristics of a Ni-Fe based superalloy (GH4169) were studied in the temperature range 900-1020 °C and strain rate range 0.001-0.1 s−1 using hot compression tests. The cold deformation characteristics of the alloy were studied at room-temperature and strain rates of 0.1-1.0 s−1 using room-temperature compression tests. A hot deformation equation is given to characterize the dependence of peak stress with temperature and strain rate. A cold deformation equation is given to characterize the dependence of peak stress. Comparing the results of the high-temperature and room-temperature deformations of the GH4169 alloy indicated that hot deformation is sensitive to both temperature and strain rate, while the cold deformation is sensitive to strain. At room-temperature deformation conditions, for true strain ≈0.2, the dynamic recrystallization nucleates and grains refine.
Mobile APP fingerprint feature extraction pattern recognition based on Random Game
Authors: Chang Jie , Zuo Xiaojun , Hou Botao , Liu Shuo 
Published: February 2021

Abstract
The traditional feature extraction method for pattern recognition increases the computational complexity of the recognition method due to the excessive feature extraction, which leads to the low accuracy of the recognition method. To solve the above problems, a fingerprint feature extraction pattern recognition method based on random game is proposed for mobile APP. After the fingerprint image processing, the fingerprint features in the image are extracted. After removing the pseudo-feature points from the extracted image features, the pattern recognition of fingerprint features is completed by using the stochastic game theory. Through the simulation experiment, it is verified that the recognition accuracy of the proposed method increases by about 1/5, and has better recognition stability.
Research on Using Big Data Marketing to Promote the Development of E-commerce under Information Management Mode
Authors: Shang Liyuan 
Published: February 2021

Abstract
Under the background of the rapid development of information technology, the analysis and application of big data has been paid more and more attention to the development and application companies and enterprises. Electronic big data has become an important strategic resource. Has played a pivotal role in the IT Internet. Big data marketing has become an important marketing strategy for company sales. From the basic connotation and concept of big data and big data marketing, this paper extends how to make full use of big data marketing in e-commerce industry.