bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Sc-bearing Lateritic Ni deposits in Ultramafic Rock from Sulawesi: A New Paradigm in Indonesia Metal Mining Industry
Authors: Maulana A , Sufriadin  , Sanematsu K , Sakakibara M 
Published: December 2019

Abstract
Scandium (Sc) and its compounds are used in many modern-technology applications such as in optical, electronic, aeronautical, and fuel-cell industries. However, Sc occurrence were only limited in a very specific area with limited deposit and little attention has been paid to the genesis of Sc-bearing deposits in the world. 6 (six) bedrock samples and 15 (fifteen) lateritic samples (saprolite to limonite) were collected and studied to investigate the distribution of Sc grades in lateritic Ni deposits and identify Sc-bearing minerals in laterites from ultramafic rocks in West Blok, East Block and Petea prospect in Soroako, South Sulawesi, Indonesia. The study suggests that scandium is enriched in limonite layer in weathering profile. In general, pyroxene bearing rich bedrock (harzburgite in composition) will contain higher Sc content in their weathering product. It is suggested that the Sc are associated with the occurrence of iron oxide from pyroxene. However, as the occurrence of Sc is very limited, the most promising result was shown by East Block profile in which the enrichment of Sc is also supported by enrichment of NiO content. Sc will be viable as by-product of nickel laterite.
Hydrothermal Alteration Associated with Vein-Type Sulphide Mineralization at Lappadata Prospect, South Sulawesi, Indonesia: A Preliminary Study
Authors: Nur I , Sufriadin  , Ilyas A , Irfan U R 
Published: December 2019

Abstract
In Lappadata area, Bone Regency, South Sulawesi Province, Indonesia, indication of vein-type sulphide mineralization is occurred. This paper describes a recent study of the prospect which focused on hydrothermal alteration associated with the mineralization. In this study, alteration and mineralization samples have been collected selectively and representatively from the field and then analyzed in laboratory using petrography, ore microscopy, and X-ray diffraction methods. The study resulted that host rocks of the mineralization are porphyritic basalt and limestone members of the Early Eocene to Late Oligocene Salo Kalupang Formation. Hydrothermal alteration mineral assemblages include quartz, chlorite, muscovite, sericite, calcite, actinolite, epidote, illite, kaolinite, and pyrite, which generally zoned from distal-propylitic mainly characterized by chlorite, calcite and epidote to proximal-argillic characterized by sericite and illite. The mineralization occurred in quartz vein and disseminated with identified hypogene ores of sphalerite, chalcopyrite, galena, and pyrite as well as supergene ores of covellite, chalcocite, and malachite. Study of the hydrothermal alteration stability temperatures suggested that the mineralization was formed in temperature range of about 200 to 300°C, from a near-neutral pH hydrothermal fluid. The whole characteristics of hydrothermal alteration, ore and gangue minerals, mineralization types, as well as range of formation temperature and composition of the responsible hydrothermal fluid indicated that the mineralization in Lappadata prospect is an epithermal type.
Characteristic Sulfat Geochemistry of Barite (BaSO4) Marine Type on Marl Tonasa Formation Barru, South Sulawesi
Authors: Tonggiroh A , Farida M , Sirajuddin H , Battu D P 
Published: December 2019

Abstract
Barites can form in the marine environment as autogenic minerals, which are dominated by barium, carbonate and sulfate elements. Barite mineral distribution on Marl are occurred on two location which are Ralla and Barru Area (1) Ralla, irregular shape (2) Barru, barite concression, slightly rounded. The study aims to determine sulfat geochemistry as chemical bond and the influence of barium depositional environment. Applied Petrography, SEM and XRD Analysis on Marl, Andesite, and Barite mineral. Tabular rosset texture with minor Calcite are indicated that source of Sulfat material comes from Neritic environment (Barru) and penetration of hydrothermal solution.
Light Distribution Analysis on Buildings Located on the Coastal
Authors: Jamala N , Rahim R , Latief S , Ramli H 
Published: December 2019

Abstract
Issues of global warming are important. The effects of illuminance level of natural light on the earth’s surface. The use of natural light into buildings can minimize energy consumption as a source of artificial lighting, but it is important to attention to negative effects such as glare, brightness and thermal. The Aryaduta Hotel building located on the coastal area, is an object of research that needs to analyze the distribution of natural light come in to the building. The purpose of this study was to determine how the distribution of natural light in buildings on the coastal area. The results of research concluded that the farther away from the veil the building then the light distribution will decrease, orientation of the building affects the distribution of sunlight and distribution of natural light into the building affects the sun’s radiation in the morning, afternoon and evening. This research can be the base for energy efficient building design.
Glare from Windows Assessment at Offices with Three Types of Internal Solar Shadings
Authors: Dinapradipta A , Sudarma E , Defiana I , Erwindi C 
Published: December 2019

Abstract
Successful daylighting requires trade off and optimization between competing elements of façade, space, and lighting system. It also requires reliable tool for assessing the indoor visual comfort, especially discomfort glare from windows. The objective of the study was to investigate the users’ glare perception due to the use of internal solar shading systems by using laboratory experimentation with subjects and measurements. The purpose was to compare these results with a glare rating equation and Luminance Distribution Ratio (LDR) and to assess the reliability of this glare assessment tool to be used for assessing glare from window and in the context of humid tropics climate. The laboratory experimentations were conducted at three identical office rooms at the Department of Architecture of ITS in which each of the room’s windows was covered with different internal solar shading types e.i. Venetian, Horizontal, and Roller Blinds. Results showed good correlation between Luminance Distributions Ratio (LDR) with the users’ responses. Among the three internal shading, the Roller blind type had the highest correlation on both working activities and sitting positions to the glare perception as well as the fittest value complying the standard of luminance distribution. The research concluded that the Luminance Distribution Ratio method can be a reliable tool for assessing glare from window for many office situations in humid tropical climate.
Climatic Significance of Colonial House Forms in Surabaya
Authors: Antaryama I G N , Ekasiwi S N N , Irvansyah  , Dewi P M , Ulum M S 
Published: December 2019

Abstract
The present study explores the morphological characteristics of colonial houses in Surabaya. Four houses are included as the subject, and physical features of the building are recorded through field observations. Basic drawings of the building are made and used for the morphological exploration. Formal and topological characteristics of the house are then analysed and its climatic response as well as climatic adaptation potentials are evaluated. Principles of climatic adaptation and findings from previous studies on the subjects are used as the basis of the evaluation. The study found that the colonial houses in Surabaya have a great potential in terms of climatic adaptation. Despite the compact shape, the layout of the building allows internal spaces to poses high connection to outdoors, and hence increases its degree of connectedness. The colonial houses show moderate degree of exposure and have high degree of porosity due to the configuration and size of windows and doors of the building. All of these formal characteristics contribute to the significant climatic response of the building.
Design and Analysis of Fixture for Welding Casing Components of Cross-Flow Turbine
Authors: Muchtar M , Rasyid S , Sonda L 
Published: December 2019

Abstract
The purpose of this research is to improve the quality of the turbine casing product by using the welding fixture. The method used was to design and make welding fixture of turbine casing welding, test the straightness, alignment, straightness, and analyzes the deviation of measurement results. Based on the design result of welding fixture assembling of cross-flow turbine casing component, it had been obtained prototype welding fixture which can facilitate the assembling process of cross-flow turbine casing component. The conclusions of this research are the quality of cross-flow turbine casing products can be increased along with the small geometry deviations in the cross-flow turbine runners by using a fastening tool. The maximum deviation of the straightness of the turbine wall is 1.6 (wall A) and 0.85 (wall B). The process of assembling the components of the turbine runner is shorter by using a faster welding assembly tool with a better level of accuracy.
Analysis on Environmental Problems and Countermeasures In The Process of Steel Material Manufacturing
Authors: Guo Yixin , Xiong Jifeng 
Published: December 2019

Abstract
Since the reform and opening up, China’s industrialization has advanced rapidly, the overall level of industry has improved markedly, and its comprehensive national strength has been further enhanced. Among the more than 500 major industrial products, the output of many kinds of products ranks first in the world, and China has become a veritable industrial power. But behind this, many environmental problems in the manufacturing process of steel materials have had serious consequences for the ecological environment in which we live and develop, and have had many impacts on our quality of life and physical health. This paper focuses on the causes of environmental pollution problems in the steel industry, and proposes solutions to these problems, providing reference for the sustainable and healthy development of the steel industry.
Inspection and evaluation strategy for uncoated weathering steel bridges
Authors: Wu Junyin , Yang Dahai , Su Qiang 
Published: December 2019

Abstract
Uncoated weathering steel can significantly reduce the life cycle cost of bridges and the difficulty of maintenance during operation. However, weathering steel is not a maintenance-free material. Design and construction errors, topography, de-icing salt and other factors are likely to cause severe corrosion of weathering steel. Therefore, effective inspection and maintenance planning is essential to ensure that weathering steel bridges can reach expected service life. Weathering steel bridges must be regularly inspected to check the corrosion of weathering steel in important parts, and evaluations shall be made to develop maintenance plans. Previous investigations show that the appearance of weathering steel’s rust layer can effectively judge its stability. Therefore, the corrosion condition of weathering steel can be judged by different rating of the appearance of the rust layer. Meanwhile, corresponding maintenance measures will be formulated.
Ultrasonic assisted solvothermal synthesis of CaCO3-Ni-MOF and its application in removing heavy metal ions
Authors: Yang Jie , Qin Guangchao , Li Qihong , Huang Huabin , Wu Yun , Zuo Xiuxiu 
Published: December 2019

Abstract
The effect of CaCO3-Ni-MOF synthesized by different ratio between Ni2+ and organic ligand terephthalic acid on the removal of heavy metal ions was studied. CaCO3-Ni-MOF was synthesized by ultrasonic and solvothermal methods. The crystal structure and morphology of the material were characterized by XRD and SEM. TG curve was used to test the thermal stability of the material. In addition, the experimental study also found that CaCO3-Ni-MOF can remove heavy metal ions. The adsorption capacity of Cu2+ was found to be 16.96mg/100mg by energy spectrum analysis. And the amount of lead also has a certain amount of adsorption. The results show that the performance of the CaCO3-Ni-MOF material in the water environment has not been destroyed, and the heavy metal ions in the water can be effectively separated.
Environmental Quality Optimization and Fiscal Decentralization: an Expanded Endogenous Growth Model
Authors: Zhou Lan , Lu Yang 
Published: December 2019

Abstract
The research focuses on China’s environmental quality and economic system. Using the endogenous growth model and Davoodi & Zou model, a four-sector endogenous growth model with variables of ecological environment and fiscal decentralization is constructed and the static and dynamic panel models are further constructed. The conclusions are as follows: ①Fiscal decentralization and tax burden have non-linear effects on environmental quality;②Fiscal decentralization and tax burden have a deteriorating effect on environmental quality while the synergy of the two produces a dilution effect that weakens each other; ③Environmental quality itself has lagged effect. Therefore, it is proposed to coordinate and consist the fiscal decentralization and tax system and cultivate innovation capabilities, reduce unit energy consumption.
Application of material testing technique in Highway Engineering
Authors: Zheng Fuchun 
Published: December 2019

Abstract
The various factors that affect the quality, cost and progress of highway engineering, a common point have been found-- material quality have plays a decisive role. Material testing technology is the key technology to ensure the quality of materials. In recent years, it has been paid great attention to in many fields of construction engineering. The significance and application of material testing technology are briefly analyzed. It was found that the material testing technology has strong practical value in the application of highway engineering, which not only influences the quality, cost and progress of highway engineering, but also accelerates the popularization of new construction technology and construction materials.
Comparative Study on Multi-type Domes of Filament-Wound Composite Pressure Vessels
Authors: Cai Qiang , Pu Xiaohang , Dan Linpeng , Li Xintian 
Published: December 2019

Abstract
Filament-wound Composite Pressure Vessels (FCPV) have been used widely in the aerospace and commercial industries. Multi-type FCPVs have been applied to different mission scenes. In this paper, four types of domes (helical winding, helical winding ellipsoid, polar winding, polar winding ellipsoid) are studied based on a simplified parametric model, and a modified meridian computing method is employed for polar and helical winding domes after the inflection points. At last, four FCPV cases of different type of domes are calculated and discussed in detail. Results indicate that the parameters of the same winding pattern dome are similar, so it is suggested to use ellipsoid domes in prior for the convenience of fabrication and avoiding the inflection point at the meridian.
A Sandwich Coating Containing Micro-perforated Panel for Underwater Sound Absorption
Authors: Li Lin , Zhang Zhifu , Xu Zhichao , Huang Qibai 
Published: December 2019

Abstract
This paper focuses on the underwater application of Micro-perforated panel (MPP) for broadband sound absorption. In this paper, MPP-rubber coating (MPPRC), a novel sandwich anechoic coating embedded with MPP in high-viscosity condition, is proposed. The acoustic impedance for MPP is derived from Maa’s equation and vibration modal modification, while the acoustic propagation property of the viscoelastic rubber layer is obtained by the wave propagation equation. The theoretical calculation for the absorbency of the composite structure is conduced based on electro-acoustic analogy method and transfer matrix approach. The sound absorption validation is carried on in a hydroacoustic impedance tube filled with water, and the experimental results match with the theoretical model. Compared with the equal-thickness rubber, the MPPRC performances better at a lower frequency of 1.6 kHz ∼15 kHz due to MPP, which shows the potential to be utilized as an underwater anechoic coating.
A Submersible in-Situ Highly Sensitive Chlorophyll Fluorescence Detection System
Authors: Pan Yi , Qiu Lei 
Published: December 2019

Abstract
Chlorophyll concentration in water is an important indicator of water quality monitoring. In this paper, the method of fluorescence analysis for the detection of chlorophyll in water is introduced in detail, and a design scheme of in-situ chlorophyll fluorescence detection instrument is proposed. Effectively improve the efficiency and accuracy of chlorophyll fluorescence detection in water by optimizing optical path, fluorescence signal modulation, filtering and other anti-interference methods; Adopt a low-power design scheme to extend the instrument’s in-situ continuous detection time. The test results show that the linear response correlation coefficient R of the self-designed water chlorophyll detection instrument is above 0.999 with an accuracy of 0.02μg/L. The in-situ measurement time can reach 3 months, reaching the level of similar high-end instruments abroad.
Corrosion behavior of plasma transferred arc and laser cladding Ni-based alloy coatings in different acid solutions
Authors: Cheng Qian , Chen Haiyan , Hou Yue , Fan Li , Dong Lihua 
Published: December 2019

Abstract
The Ni-based coatings were prepared by laser cladding (LC) and plasma transferred arc (PTA) welding, respectively. The corrosion behavior of the coatings were tested by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical corrosion, long-term immersion tests and X-ray photo electron spectroscopy (XPS) analysis. The results of XRD showed that the composite coatings comprised Ni, Cr and Mo. The electrochemical corrosion tests included polarization curves and electrochemical impendance spectroscopy (EIS). The XPS analysis presented samples included Ni, Fe, Cr and Mo oxides, which protected the substrate from corrosion by acid solutions. The results also presented that the Ni-based PTA coating is more resistant to corrosion than the Ni-based LC coating. In the immersion tests, the coatings changed from pitting to general corrosion as the immersion time prolonged.
Synthesis of Ethyl 4-(4-Nitrophenoxy) Picolinate
Authors: Xiong Hehua , Gao Yanli , Yang Qi , Tang Qidong , Zheng Pengwu 
Published: December 2019

Abstract
Ethyl 4-(4-nitrophenoxy) picolinate 4 is an important intermediate for the synthesis of many biologically active compounds. The compound ethyl 4-(4-nitrophenoxy) picolinate was obtained by three simple steps to synthesis from 2-picoliniacid. In this paper, three novel chloropicolinoyl chloride derivatives were prepared. The structure was confirmed by MS and 1H NMR. Furthermore, the synthetic method was optimized. The total yield of the target product was 78.57%.
Study on Microwave Sintering Process and Surface Texture Characteristics of Ceramic Materials
Authors: Xu Zhihua 
Published: December 2019

Abstract
The sintering process and properties of nano-cermet materials were studied by microwave sintering new technology. The results show that the microwave sintered Al2O3-TiC-Mo-Ni nano-ceramics can reach a relative density of 99.0% when kept at 1500 °C for 10 min; the sintering temperature is lowered, the sintering time is greatly shortened, and the grains are sintered before and after sintering. The diameters are 35 and 55 nm, respectively, with little change. At the same time, the paper discusses the surface texture formation and aesthetic characteristics of ceramic materials after sintering. The paper hopes to contribute to the art ceramics firing and decoration field.
Research on the aging characteristics for different FRP composite material before and after 5000h multi-factor aging
Authors: Feng Bing , Wu Xiong , Li Panfeng , Xie Fang 
Published: December 2019

Abstract
In order to reveal the the aging characteristics for different FRP composite material before and after 5000h multi-factor aging, different resin-based/glass fiber composites are prepared, and the effects of various factors such as mechanical strength, microscopic interface and thermal stability on the aging resistance of composites are discussed. The results shows that the flexural strength retention rates of the composite samples are above 90% after 5000h multi-factor aging, and the aging resistance is good and meets the project requirements, SEM scanning displays that there is no obvious cracks on the interface between the glass fibers and the resin matrix after multi-factor aging test, and the interface is not affected obviously by various aging factors, the modified polyurethane PU and modified polyurethane PUR composite materials also show good aging resistance.
Metal Oxide Nanostructures-Based Gas Sensor for Ethylene Detection: A Review
Authors: Xing Yanxia , Zhu He , Chang Guifang , Yu Kexue , Yue Fengli 
Published: December 2019

Abstract
Increased ethylene content may induce the synthesis of respiratory enzymes and enhance respiration, which accelerated fruit ripening. Monitoring of ethylene concentration is critical in the fruit industry, avoid the fruit from passing through. Research interest has focused on the utilization of nano-sized semiconductor to monitor the ethylene through various processes. As detection for ethylene with excellent sensitivity, superior quantum efficiency, and fast response speed, nano-sized semiconductors are regarded as the most promising directions for nanomaterials. We review the latest achievements with nano-sized material gas sensors as for ethylene detector in the article. Firstly, the classification and structure of semiconductor detectors are introduced (such as resistive transducer; non-resistive transducer; organic semiconductor gas sensor), Then we present several kinds of and their performance, focusing on binary oxides with wide band gap (such as ZnO, SnO2, Ga2O3, Nb2O5, and WO3) and ternary oxides (such as Zn2SnO4, Zn2GeO4, and In2Ge2O7) Eventually, finally, we review and summarize the perspectives in this field and the prospects for future research. Perspectives and outlook on future research directions in this field.
The Effect of Diamond Wheel Wear on Surface and Sub-Surface Quality in Fused Silica Optics Grinding
Authors: Zhou Lian , Wei Qiancai , Li Jie , Chen Xianhua , Wang Jian , Xu Qiao 
Published: December 2019

Abstract
During the ultra-precision grinding process of fused silica optics, the micro-removal processes of brittle and hard fused silica material by diamond grits in different wheel wear states are inconsistent, which leads to the instability of the grinding quality of the components. First, the wear forms of diamond wheel in the process of grinding brittle and hard fused silica material were analysed. The main wear form of diamond grinding wheel was diamond abrasive wear. Then taking the cumulative removal volume of material as the evaluation parameter of wheel wear state, the evolution laws of surface roughness and sub-surface defects of components under different cumulative removal volume of material were studied. With the aggravation of grinding wheel wear, the surface roughness and depth of sub-surface defects layer decreased first, and then fluctuated and increased slowly. In the rapid wear stage, the falling diamond particles scratched deep grooves on the surface of components, and the roughness and sub-surface depth increased sharply. According to the results, it’s reliable to monitor the wheel wear state and predict the life of wheel.