bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultrathin Muffler with Coherent Coupling Weak Resonance for HVDC Converter Station Medium Frequency Band Noise Control
Authors: Yang Dingge , Shang Yu , Han Yanhua , Li Wenhui , Wu Jingfeng , Niu Bo 
Published: May 2021

Abstract
HVDC converter station noise is mainly in medium frequency band, but the thickness of the conventional duct silencers are equivalent to the working wavelength, which makes them difficult to apply in narrow spaces. In this paper, through parallel and serial coupling of imperfect Helmholtz resonators with interpolated neck, a hybrid silencer with broadband perfect absorption is presented, which remain above 10 dB from 568 to 992 Hz with a thickness less than 20mm. In order to reveal the underlying physical properties and acoustic performance, simulations considering the coupling of acoustics and thermodynamics and impedance analysis are performed, showing a good consistency, and it’s further verified by experimental result. The results of research can help design effectively, ultra-thin and wide-band duct silencer for HVDC converter station medium frequency band noise control.
Research on Fault Current Endurance Capability of Concentric HTS Cable
Authors: Wu Xiaochen , Hu Ziheng , Zhang Bin , Wang Zhenzi , Wang Wei , Wang Zhe , Wang Bangzhu 
Published: May 2021

Abstract
Based on the resistance response of high temperature superconducting (HTS) YBCO tape under overcurrent, a physical model of compact three-phase concentric HTS cable under fault current was established using adiabatic approximation. We consider the endurance criteria of no irreversible damage to the superconducting tapes and no significant vaporization of LN2. The fault current endurance capability of concentric HTS cable was obtained at different fault currents. The safety of the superconducting cable can be ensured by adding current limiting device to reduce the fault current magnitude or by improving the relay system to reduce the protection action time.
Modelling and Optimization of Boiler Steam Temperature System Based on Neural Network and Genetic Algorithms
Authors: Zhang Kailiang , Li Fengping , Yi Chen , Huang Liang 
Published: May 2021

Abstract
The combination of neural network and genetic algorithm not only can improve the operating efficiency and economy of the boiler, but also give the recommended values of the operating parameters for the boiler operation. Based on the field data from power plant, the errors of the 3 and 4-layer neural network were compared according to the data experiments. The 4-layer neural network was used to model the steam temperature system. Taking the standard heat consumption as the target value, the adjustable and non-adjustable quantities of the input parameters of the steam temperature system are determined, and the genetic algorithm is used for optimization. The results show that the standard heat consumptions of all the 100 groups of working conditions are reduced. The maximum reduction of heat consumption is 186.88 kJ/(kW·h), and the average reduction is 153.93 kJ/(kW·h). This indicates that the combination of neural network and genetic algorithm can optimize the boiler steam temperature system by optimizing parameters such as superheater de-superheating water flow, superheater flue gas baffle opening and reheater flue gas baffle opening, which provides guidance for actual production.
Comparative study on the impact of clean energy on carbon emissions in different regions of China
Authors: Fan Xiangbo , Li Chenggang 
Published: May 2021

Abstract
Using the panel data of 30 provinces in China from 2008 to 2018, this paper compares the impact of clean energy on carbon emissions in different regions of China on the basis of extending the STIRPAT model. The results show that the impacts of clean energy on carbon emissions are different in different regions. The eastern region is not significant due to its developed economy and many influencing factors. The carbon emissions in the central and western regions are significantly affected by the energy structure, which reflects the relatively low scale of clean energy development in China and the huge dependence on fossil energy. In the future, one is to continue to strengthen the construction of clean energy; the other is to improve the technological level of the central and western regions and reduce their dependence on fossil energy.
Metallurgical Analysis of different processing technologies on tensile behavior of GH4169 superalloy
Authors: Chen Wen , Zhang Peng , Xie Jing , Liu Yang , Luo Ning 
Published: May 2021

Abstract
By the measurement of tensile property and microstructure observation, the different effect of 1MJ counter-blow hammer forging and 800MN die forging on the disc were investigated. In order to obtain final forging temperature, hot compression tests under 920~1030°C at 0.08 true strain were performed on GH4169 superalloy. The results showed that at the same processing parameter, ASTM 10 grain and granular δ were obtained by count-blow hammer forging, UTS is 1563Mpa; ASTM 8 grain and needle-like δ phase segregation were obtained by die forging, UTS is 1408Mpa. According to evolution of microstructure under isothermal compression, in one case that final forging temperature of count-blow hammer is about 1000°C, while it is 930°C under die forging. The microstructure of the forging is strongly related to the fabrication process, increase the preheating temperature of the die as much as possible, increase the pressing rate, excellent mechanical property can be obtained by die forging.
Influence of permeability on the minimum miscibility pressure between CO2 and crude oil
Authors: Liu Li , Guo Zhuang , Pi Yanfu , Liu Jinxin , Li Chengliang 
Published: May 2021

Abstract
The slim tube test is the industry standard for measuring the minimum miscibility pressure at present. However, there is a huge gap between the pore parameters of the slim tube model and the actual reservoir, especially the influence of permeability on MMP is not considered. The previous studies have shown that the minimum miscibility pressure is related to the pore structure and permeability of the reservoir. It is believed that there are some theoretical defects in the MMP measured by the slim tube test. This paper aims at the defect of slim tube test, core displacement experiment is carried out by using natural core to measure the minimum miscibility pressure under different permeability, and to reveal the law of the influence of permeability on the minimum miscibility pressure.
Numerical Simulation of Jet Forming Characteristics of Energetic Liner Based on Smoothed Particle Hydrodynamics Algorithm
Authors: Chen Baiquan , Shi Jiazheng , Ma Zihao 
Published: May 2021

Abstract
To study the jet forming characteristics of energetic material liner, in this paper, using AUTODYN simulation software and smoothed particle hydrodynamics (SPH) algorithm, the jet forming process of traditional metal Al liner and PTFE/Al energetic liner with different shapes, different cone angles and different thickness was simulated. The results show that the morphologies of PTFE/Al energetic jet and Al inert jet are significantly different, PTFE/Al jet has divergence compared with Al jet. With the increase of cone angle of liner, the velocity of jet tail increases, the velocity of jet head and the length of penetrator decrease. As the liner thickness increases, the head and tail velocity of the jet decrease, and the length of the penetrator increases.
Effects of post-annealing in different gas atmospheres on the properties of Tl-2212 films fabricated by sol-gel method
Authors: Jiang Yanling , Yue Hongwei , Wei Jinzhong , Chen Mingxian , Han Xu , Jin Yanying , Tang Pingying , Huang Guohua , Xie Qinglian 
Published: May 2021

Abstract
Tl-2212 superconducting thin films were fabricated on LaAlO3 (00l) substrates by sol-gel method. In the process, the precursor films were annealed in various gas atmospheres. XRD and EDX testing results showed that the precursors annealed in O2 converted into pure Tl-2212 superconducting phase, and the nominally stoichiometric cation ratio of TlBaCaCu was close to 2:2:1:2. The Tl-2212 film had a layered morphology and medium-quality superconductive parameters, which included the critical temperature T
c of 105.5 K, and the critical current density J
c of 0.8 MA/cm2 (self-field, 77K).
Gis-Based Fire Risk Spatial Assessment for Semiconductor Plant
Authors: Li Hongga , Huang Xiaoxia 
Published: May 2021

Abstract
Traditional fire risk assessment of semiconductor plant mainly relies on engineer experience from fields of fire control, chemistry, construction, semiconductor and insurance, and lacks a collaborative tool to integrate different design blueprints and locate high risk regions. In this paper, we introduce GIS into fire risk research for semiconductor industry, and propose a GIS-based spatial and quantitative method of fire risk assessment. Based on semiconductor plant spatial database extracted from diversified indoor maps, we set up a fire risk index system and integrate factors of potential fire source, operation risks of fabrication process, fire proof design and fire management to identify the high fire risk regions by using analytic hierarchy process. The proposed method improves spatial analysis capabilities of fire risk assessment for more and more complex semiconductor factories.
Application of an Improved Association Rule Algorithm in Rural Development Assessment in China
Authors: Zhang Chenguang , Teng Guifa 
Published: May 2021

Abstract
Association rules based on big data are derived from shopping basket analysis, which can deeply explore the association between things, and have been widely used in many fields. The traditional algorithm of association rules has several shortcomings, a new improved algorithm of association rules was proposed in this paper, which combines the precise advantages of Bayesian classifier with the full-scale characteristics of big data technology, and was applied to the rural development assessment process. After 2020, China’s rural industrial structure will undergo great changes, and environmental protection to drive economic development is an important part of it. The new association rules can be better adapted to the needs of the assessment. Through comparison, it can be seen that the confidence results obtained by the new association rules are more accurate than Pearson correlation coefficient. Finally, the association rules among CPI, per capita consumption expenditure and per capita disposable income are analysed, and suggestions for rural development have also been made.
Research progress on the application of phosphate oxygen isotope in environmental science - tracing sources and reaction mechanisms identification
Authors: Lin Xingjie , Zhang Chi , Miao Yu 
Published: May 2021

Abstract
Phosphorus is a vital element in the ecosystem, which plays an important role in ecosystem. Organic phosphorus compounds are widely distributed in soil and water bodies. As many organic phosphorus compounds are pollutants, they have potential threat to the environment. Therefore, the study of the cycling of organic phosphorus compounds in the environment plays an imperative role in the prevention and control of phosphorus pollution. As a geochemical tracer, the oxygen isotope in phosphate has been widely used in recent years to study the cycling process of phosphorus in nature. This article summarizes the application principle of phosphate oxygen isotope and its application in the tracing phosphorus sources and reaction mechanisms identification of organic phosphorus compounds. This work provides a reference for the future researchers.
Punching Shear in Reinforced Concrete Flat Slabs in Multi-Storey Car Park Building Structure
Authors: Chiang J C L , Tan W Z 
Published: May 2021

Abstract
Punching shear failure had been the cause of some fatal accidents that had occurred in the past in flat slabs of car park structure. A number of such failure reports had identified the underlying reasons being in the use of outdated or obsolete standards which have been phased out. Therefore, the design and analysis of punching shear strength in reinforced concrete flat slab is a key procedure that requires precision and accuracy. Over the years, although researchers had done a lot of experimental studies on the behaviour of flat slab structures, but the punching shear failures still happened despite many precautions being taken when designing for the car park structure. In this paper, some data that had been presented by previous researchers are used to identify the few design criteria for multi storey car park structure, and these results will also be compared with Eurocode 2 and two other standards, namely the phased out BS8110 and ACI318. From there the analysis for punching shear in multi storey car park structure is carried out using the Eurocode 2 approach considering the varying design parameters such as the sizes of column, slab thickness, span between columns and shapes of column. These parameters played a major role in assessing the punching shear strength in multi storey car park structure. In the model simulation, it was found that among the four selected parameters for study, the thickness of slab and the column size adopted are key factors that can enhance the punching shear strength capacity. On the other hand, the use of square column was proven to have an average of 27% higher punching shear strength than circular column. Besides that, the span between columns in two plane directions are best to range around 6m and 7m but due to car park functional expectations, a flat slab bay area of 8m × 6m and 9m × 6m can be recommended for the purposes of accommodating more car park spaces.
Potential of activated carbon in lime mortar plastering in term of fire resistance and thermal performance
Authors: Rahman M A A , Yazid A S , Awang M , Musa M K , Mustafa M S S , Hamidon N , Hashim N , Ahmad F 
Published: May 2021

Abstract
The use of lime mortar plastering for wall construction in residential and light commercial buildings has increased significantly over the world. The unique characteristic of hydrated lime increases the strength of the tensile bond. The more considerable the amount of cement content in cement lime mortar, the low the air content; thus, the bond strength stronger. The performance of plastering under fire exposure is an item of significant importance in securing construction. Activated carbon is one known adsorbent which has a high capacity to adsorb gases and improved fire resistance ability of concrete. The purpose of conducting this study is to identify the optimum proportion of lime mortar plastering containing activated carbon with different percentages which is 0%, 10%, 30% and 50% as cement replacement. Therefore, a fire resistance test was conducted on cement plaster mixtures with variable ratio content of activated carbon to identify the optimum proportion according to the temperature reading by an infrared thermometer for 30 minutes. Based on the results obtained, the sample with 30% activated carbon as cement substitution was the most effective since it gave a relatively low initial temperature reading which was 28.2°C. The test showed only a slight increase in temperature after the first five minutes, which is 93.1% and reached 108.2°C at maximum even after 30 minutes of testing. There was no hair crack developed, and no visible of smoke observed from the sample compared to existing plaster which formed hair crack and visible of smoke at 280°C after 16 minutes of testing. Therefore, 30% of activated carbon is the optimum proportion in lime mortar plastering due to ability to resist fire and prevention from hair crack and visible smoke formation. This proportion can be applied to the interior and exterior wall of the building, especially at the compartment wall and along the escape route.
Effect of Water-Cement Ratio on Mechanical Properties of Rubberized Fly Ash Concrete
Authors: Najmi A M , Mariyana A K , Shek P N , Nurizaty Z , Ramli M Z , Alel M N A , Mujedu K A , Aluko O G , Tohami M 
Published: May 2021

Abstract
One of the efforts to reduce the dependency of concrete production on natural resources along with carbon reduction is by utilizing recoverable materials as concrete constituents such as crumb rubber from scrap tires and fly ash from industrial waste. This study aims to investigate the mechanical properties of rubberized fly ash concrete which utilized crumb rubber and fly ash as a replacement for a proportion of fine aggregate and cement, respectively. Crumb rubber was used to replace 5 and 10% fine aggregate while fly ash was used to replace 10% OPC by weight. Three different water-binder (w/b) ratio, 0.55, 0.50 and 0.45, were used. The concrete specimens were prepared and tested for their density, compressive strength, splitting tensile strength, and flexural strength. Result gathered from the experimental works show a reduction in properties of rubberized concrete when compared to conventional concrete. By using a lower w/b ratio, the reduction tends to decrease and rubberized concrete with 0.45 w/b ratio recorded comparable density and strength to that normal concrete. The use of a lower water-binder ratio in concrete mix improved the strength of rubberized fly ash concrete equivalent to the normal concrete, allowing for usage of green materials in real building construction.
Structural Performance Assessment of High Strength Concrete Containing Spent Garnet under Three Point Bending Test
Authors: Budiea A. M. A. , Sek W. Z. , Mokhatar S. N. , Muthusamy K. , Yusoff A. R. M. 
Published: May 2021

Abstract
The utilization of river sand for miscellaneous construction purposes had directly increased due to rapid growth of construction industry. This fact caused over exploitation of riverbeds and troubled the eco-system. This study aims to find out the optimum percentage of spent garnet in high strength concrete and to forecast the structural performance of high strength concrete containing spent garnet with the previous research results. This study focusing on comparing and forecasting the utilization of 0%, 10%, 20%, 30% and 40% spent garnet as a sand replacement in high strength concrete at the age of 28 days. The level of 20% replacement of sand seen to be the optimum percentage of spent garnet for this concrete mixture to enhance its structure performance. It is concluded that, utilization of spent garnet in high strength concrete production able to reduce the dependency on river sand and lesser the waste from landfill.
Evalution on Strength Concrete Containing Micro Steel Fiber: A Review
Authors: Ramasamy S , Shahidan S , Rosdi A N H , Manaf A F A , Zuki S S M , Azmi M A M , Shamsuddin Shamrul-Mar , Abdullah S R , Ali N 
Published: May 2021

Abstract
Concrete has been used for a very long period in construction sites all over the globe. Concrete is very crucial in producing structural members in any building structure. It has to be strong enough to bear the loads of building so that it will not be failed. This article focused on a critical review of concrete containing micro steel fibres (MSF) in order to improve its ductility. In this study, the research is to determine whether the usage of micro steel fibre can improve the compressive and splitting tensile strength of concrete or not. In general, the strength of the concrete improves as the amount of MSF in the matrix increases. All the assessments conducted in all the paper that has been reviewed are following the standard test of British Standard. In a nutshell, the addition of micro steel fibre to concrete does have a huge impact on the tensile and compressive strength. The properties of concrete are expected to enhanced compared to normal concrete; however, the tensile strength does not show any improvement.
Performance of Sodium Silicate as Self-Healing Agent on Concrete Properties: A Review
Authors: Mokhtar Norfaniza , Hassan Muhammad Fitri Mah 
Published: May 2021

Abstract
Important materials in construction industry are concrete. Even though concrete is strong and durable, but it is still exposed to the crack. The most severe phenomenon of cracking happens in concrete without adequate and prompt care, and the framework of the crack continues to grow, which ultimately involves substantial potential maintenance costs increase. This study aims to review the effect of sodium silicate as self-healing agent on engineering properties and to observe the influence of sodium silicate inclusion in concrete on the microstructural characteristics. To obtain relevant paper for this research, a systematic literature review was used. The self-healing mechanism in a concrete help in reducing the cracking problem as it could delay the deterioration time and reduce the interaction of humans in managing the crack. Sodium silicate used in the concrete reacts with calcium hydroxide that already contains in the concrete to produce a new kind of binding material, namely calcium silicate hydrate (C-S-H). The outcome of this study has developed green and new technology to the concrete production in achieving sustainability which is the use of sodium silicate capable indicate healing properties in the cracking of concrete.
Effects of durian sawdust as a partial replacement of fine aggregate in concrete
Authors: Deraman Siti Noratikah Che , Rashid Muhammad Afif Daniel Abdul , Saad Siti Asmahani , Husain Nadiah Md. , Masjuki Siti Aliyyah 
Published: May 2021

Abstract
Recently, many researches all over the world are focusing on ways of utilizing either industrial or agricultural wastes as a source of raw materials for the construction industry. The aim of this study is to determine the optimum proportion of durian saw dust as partial replacement for fine aggregate. These wastes utilization would not only be economical but may also help to create a sustainable and pollution free environment. Durian sawdust is one such fibrous waste-product from durian skin. In this paper, untreated durian sawdust has been partially replaced in the ratio of 0%, 5%, 10% and 15% by volume of fine aggregate in concrete. Fresh concrete tests like compacting factor test and slump test were undertaken along with hardened concrete tests like compressive strength test and UPV test. The result shows that durian sawdust of 5% partially replacement of fine aggregate can be used for structural and non-structural purposes.
Finite element analysis on flexural behavior of nonprismatic longitudinal section reinforced concrete deep beam
Authors: Cahyati Martyana Dwi , Prayuda Hakas , Monika Fanny , Pratama Muhammad Mirza Abdillah , Siswantoro Eri Putra , Pradana Panji 
Published: May 2021

Abstract
Increasing of building constructions demand affects the innovation for developing structural elements, especially in the beam element known as deep beams. The deep beam is a popular beam with an adequate ratio of a/d < 1.0. Therefore, Compared to the standard beam, The strength of the deep beam shows better. It also can be applied to various construction. Based on observations in the field, the length of the cross-section of the deep beam varies significantly, starting from the prismatic and non-prismatic shapes. Therefore, this research has conducted to determine the effect of non prismatic longitudinal section variations on the RC deep beam behavior using finite element method. The simulation model analyzed consists of one prismatic longitudinal section and two types of the non-prismatic longitudinal section. The result shows that the non-prismatic longitudinal of the deep beam gives effects on slightly decreasing flexural load, ductility and failure mode. The failure modes shown in models show the same characteristics, which are both experiencing shear failure.