bluuebunny/crossref_metadata_2025 huggingface dataset:
Communal space design in kampong Wonosari Semarang as an effort toward a low carbon tourism kampong
Authors: Setyowati Erni , Indriastjario  , Astetika Sara Isti
Published: February 2020

Known as the Rainbow Kampong, the kampong Wonosari is a kampong in the Randusari sub-district, a district within a region of the South Semarang District. Previously known as a slum kampong, people have named the kampong to become the Rainbow kampong due to the thematic kampong program which was accelerated by the Major of Semarang city in 2016. The kampong has two RW (Rukun Warga) with a population of more than 3,000 inhabitants. Based on the population data of Randusari sub-district, the RW #3 of the Kampong Wonosari has 1,724 inhabitants divided into 10 RTs (Neighborhood Groups). With this high level of population density the existence of communal space is very important. Refer to the number of households and the low carbon concept, the kampong could reduce the carbon dioxide emission as much as 21.3689% by re-designing the communal spaces.
The restoration of old mosques heritage in Pekojan, Jakarta
Authors: Syahid Mushab Abdu Asy , Kurniawan Kemas Ridwan , Jahja Naufan Ashraf , Putra Arga Patria Dranie , Subandrio S.
Published: February 2020

Recent efforts of restoration on the Muslim religious sites in Jakarta take place in several old mosques that were built around the old settlements (kampung) of creole communities in Pekojan. This historic kampung is situated on the western fringe of Jakarta Old Town since eighteenth century and adjacent to the other diverse ethnic groups’ neighbourhood. The challenges emerge when the old mosque continues to expand its space volumes and adapt to accommodate the users’ needs and so the expansion impacts the ethics of restoration. This research specifically took a case study in Jami Mosque of Kampung Baru as one of the heritage mosques built in Pekojan. The early process of the documentation and historical research found various levels of deteriorations and extensions in the building. By applying participatory action research, it showed the early efforts of restoration led by locals. This research also concerned with the responsibility of the owners, functionaries, community officials, and users towards the cultural heritage to be contested. It also extended the conceptual meaning of “ownership” of cultural heritage by definition in terms of religious building in Indonesia.
Study of benthic foraminifera and its connection with environmental condition in Bidadari Island, Kepualauan Seribu
Authors: Zubaida V , Sartimbul A , Natsir S M
Published: February 2020

Bidadari Island is one of the tourism area, located in the southern part of Kepulauan Seribu. Tourism activities and its location that directly facing Jakarta Bay, obviously will affect the quality of the waters and ecosystems in Bidadari Island. A study of benthic foraminifera was carried out in 10 surface sediments and water quality samples, collected from the Bidadari Island, in order to determine the connection between abudance of foraminifera with the environmental conditions. Quantitative analysis, including calculation of abundance, community structure, and biplot analysis conducted to obtain this information. The results showed that there were 2473 individuals benthic foraminifera with a total of 33 species from 23 genera. The most abundant genera were Amphistegina, Calcarina, and Operculina. Based on the calculation of the community structure (diversity, evenness, and dominance index), benthic foraminifera on Bidadari island are in the low to moderate category, it indicating that the environmental condition in this area has begun to declined.
Effects of Six Types of Straw Derived Biochar on Anaerobic Biodegradation of Polybrominated Diphenyl Ethers in Mangrove Sediments: A Microcosm Experiment
Authors: Chen Juan , Wang Peifang , Wang Chao , Gao Han
Published: February 2020

Biochar has widely applied as sorbent for sequestrating pollutants, however, its effects on biodegradation of organic pollutants and microbial mechanisms behind remains poorly understood. Here, we carried out a microcosm experiment to investigate the effects of six types of straw derived biochar on anaerobic biodegradation of polybrominated diphenyl ethers (PBDEs) in mangrove sediments. The results showed that the reductive debromination was a critical process of PBDE degradation under anaerobic condition. The reductive debromination efficiency was significantly enhanced after the addition of rice straw and corn straw biochar prepared at relatively low temperatures (C300, C400 and R300), but was inhibited by rice straw biochar produced at high temperatures (R500), indicating that the biochar effects on PBDE degradation depended on its pyrolysis temperature and straw type. The stimulatory effects of C300, C400 and R300 may be attributed to the increased abundance of organohaliderespiring bacteria (OHRB), especially genera Dehalogenimonas, and the high diversity of typical OHRB in family Dehalococcoidaceae. In addition, biochar addition significantly altered the bacterial community compositions, in particular, several OHRB genera were enriched by C300, C400 and R300, facilitating the anaerobic biodegradation of BDE-47 in contaminated sediments. These results will help us to understand the potential of biochar amendment for contaminated remediation.
Experimental Study on the Removal of Formaldehyde by Plasma-Catalyst
Authors: Yuan Junfa , Xu Ping , Wang Jiaqian , Zhang Weiwei , Zhou Jiecai , Lai Anxing , Wang Lei
Published: February 2020

In this paper, a new type of indoor air purification device was designed. Corona discharge combined with catalysis and physical adsorption was used in this device. Formaldehyde (PA), a typical indoor air pollutant, was chosen as the model pollutant. The effects of MnO2 in degradation of PA by electrical discharge were discussed. The results showed that corona discharge can effectively remove PA, and the addition of MnO2 can not only accelerate the degradation rate, but also solve the problem of excessive ozone (O3). Besides, the corona discharge plasma also has the function of in-situ cleaning for MnO2. The new reactor has the characteristics of high efficiency, energy-saving, without secondary pollution.
Evaluation of Removal Performance of Triamcinolone Acetate by Typical Water Treatment Agents
Authors: Lai Chengran , Qiu Jie , Li Rui , Chen Wenchao
Published: February 2020

In this paper, the removal performance of Triamcinolone acetonide (TA) by ClO2, NaClO, O3, K2FeO4, and KMnO4 oxidation was assessed. The effects of pH value and humic acid (HA) on TA removal during KMnO4 oxidation process were also investigated. The results showed that ClO2, NaClO, and O3 were not sufficient for TA elinimation. However, K2FeO4 can capable of removing TA effectively, and the removal rate of TA can be achieved 84.6% at 60 min while K2FeO4 dosing at 10 mg/L. However, the removal effect of TA in water was inhibited as the concentration of K2FeO4 overdosed. KMnO4 can degradate TA effectivly. TA can be completely removed after 90 minutes while the initial concentration of TA is 250μg/L and the KMnO4 dosage at 50mg/L.Weakly acidic and neutral conditions can promote TA removal, the effect of Humid acid (HA) on TA removal was based on the HA dosage, an inhibitory effect was obsearved when the dosage of HA from 1mg/L to 5mg/L, however when CHA≥7mg/L, HA can accelerate TA removal.
Development of a Sparse Polynomial Chaos Expansions Method for Parameter Uncertainty Analysis
Authors: Wang C X , Liu J , Li Y P , Zhao J , Kong X M
Published: February 2020

Incorporating uncertainty assessment into hydrological simulation is of vital significance for providing valuable information for conserving and restoring the ecology environment in arid and semiarid regions. In this study, a sparse polynomial chaos expansions method was developed to quantify hydrological model parameter uncertainties on model performance in Kaidu river basin, China. A four dimension two order polynomial chaos expansions model was built and the effect of four parameters were quantified based on the coefficients of the polynomial chaos expansions model. Results indicated that precipitation in summer has more significant influence on model output than that in other seasons. High Sobol sensitivity indices values (0.22 in spring, 0.17 in summer, 0.21 in autumn and 0.29) for the interaction of precipitation and maximum capacity for fast store demonstrate that they are the major factors affecting runoff generation. These results can help reveal the flow processes and provide valuable information for water resources management.
The Water Footprint of Uzbekistan’s Agricultural Products: 1980-2010
Authors: Ding Yakui , Li Yongping , Huang Guohe
Published: February 2020

In this study, a Water-footprint Assessment Method (WAM) is proposed to assess agricultural water footprint and its flow in Uzbekistan’s agricultural sector. Several findings can be summarized: (i) the annual average water footprint of the agricultural sector is 33.3 billion cubic meters, which is in a downward trend, the main reason is the reduction of crop yield and the improvement of water use efficiency; (ii) the Green Water Footprint (GWF) and Blue Water Footprint (BWF) are 133 and 20 billion cubic meters respectively, cotton contributed most of the BWF, indicating that cotton consumed a lot of surface and groundwater, which indirectly led to the shrinking of the Aral Sea; (iii) an annual average of 3.23 billion m3 of total water footprint (TWF) flows to neighbouring countries such as Russia Federation, China and Bangladesh through agricultural products, accounting for 6.6% of the total water resources of Uzbekistan. These findings will provide theoretical and data support to policy makers for water resources optimization management.
Research on High-precision Positioning Technology for Partial Discharge of High Voltage Switchgear
Authors: Wei Xiao , Li Dali , Zhu Hongwei , Jia Kaijing
Published: February 2020

With the advancement and development of power technology, the research of high-voltage switchgear has always been a hot issue. Countries around the world are actively conducting related research. Good high-voltage switchgear can have a positive impact on the development of the power grid. This paper studies the partial discharge positioning technology of power system switchgear, introduces the common ground wave and ultrasonic detection of partial discharge technology, and builds the space model of power switchgear, and proposes the use of hyperboloid method and space search method. The positioning technology of the partial discharge of the switchgear is combined with the multi-channel power switchgear detection equipment used in this paper. The effectiveness of the multi-channel switchgear to detect and locate the partial discharge is verified by simulation experiments. This article introduces the principles of high-voltage switchgear diagnosis and collects local high-precision positioning technology. It introduces the most widely used monitoring technology and live TEV AE real-time monitoring technology, and its complex concepts and principles. It can clearly compare two live detection technologies. Existing power companies generally use two mating devices, high-voltage switchgear, to better diagnose the PD phenomenon; they also introduce positioning methods and positioning technologies. The four-channel detection technology is mainly charged and applied positioning methods and positioning Surface space network search method.
Drinking water treatment with membrane ultrafiltration
Authors: Barlokova D , Ilavsky J , Marton M
Published: February 2020

Ultrafiltration was investigated within the pilot-plant tests at the Rozgrund water treatment plant during the treatment of surface water originating from the Rozgrund reservoir. Fully automated ultrafiltration equipment with the membrane module UA-640 (Microdyn-Nadir) was used. On the base of filtration cycles, the effectiveness of membraned technology was evaluated. By the application of membrane technology used, the required quality of treated water has been achieved.
Microbiota as an indicator of the environmental burden of mined-out sites
Authors: Boturova K
Published: February 2020

The article focuses on the characteristics of the microbial community in the postmining territory of Poproč (Slovak Republic), where polymetallic ore was mined in the past. The investigated waste substrates are characterized by the still high presence of antimony, arsenate, lead and other toxic and potentially toxic metals and semimetals. Microbial activity in postmining substrates was established on the basis of the presence of functional microbial biomass by fumigation-extraction method. The results are complemented by additional ecosystem parameters, in particular, the representation of individual cultivable groups of microorganisms. The activity of the microbial community is in direct interaction with the post-mining environmental burden and can, therefore, be considered as an indicator of the revitalization of the in situ environment.
Geothermal energy in mining water in the North Bohemian Brown Coal Basin
Authors: Davidkova V
Published: February 2020

This article is focused on utilization of geothermal potential of mining water in the North Bohemian brown Coal Basin. Using of geothermal energy reduce CO2 which is one from interest for protecting of the environment and with sustainable development. Other benefit is that geothermal energy is that cost effective. Although geothermal energy has many advantages is not so much utilized. In terms of geothermal energy, the site, as part of the Krušnohorské and Podkrušnohorské area, and these are to the most promising areas in the Czech Republic sections characterized by high heat flow. In article is presented the case study at Bílina mine. The field research covered water temperature measurement and the abundance of four hydro-geological boreholes and results showed that although the geothermal potential of the mine water is not significant, there will be great potential in low-temperature energy source use for heat pumps.
Circular economy and supplying the industry with water in the periods of drought
Authors: Drabinova S , Kyncl M
Published: February 2020

The foreseen climatic changes and thus related changes in the water supplies shall largely concerns the industry. The paper reviews the current conditions in the supplies of service water in the industry, and aims to identify the options how to supply the industry with water in the periods of drought. In particular, it focuses on medium-sized companies that require water for their technologies. The paper builds on the knowledge of circular economy to target both financial and raw material savings.
Main parameters of a wastewater treatment plant up to 2000 PE in the Czech Republic
Authors: Hlustik P
Published: February 2020

The article deals with optimising the design parameters of wastewater production and specific pollution production in wastewater treatment plants up to 2,000 PE. The values of design parameters for the WWTP calculation are laid down in the legislation (ČSN 75 6401 and ČSN 75 6402) recommending their use with a potential reduction in the pollution of up to 50% according to the size of the municipality. Determination of the pollution reduction is no longer defined in standards and design values for different drainage systems are not defined, either. The design values for WWTP calculations should be based on realistic measurements covering at least the past three years. The objective of this article is to determine more precise design values applicable to WWTP calculations and different drainage systems on the basis of statistical evaluation of individual water quality indicator analyses.
Dishwashing detergents and their effects on respiration inhibition of activated sludge
Authors: Klimantova V , Raclavska H , Bouchalova J
Published: February 2020

Nowadays, many households in the Czech Republic have a dishwasher. Their use releases the remnants of the dishwashing detergents used therein into the sewerage network. These substances affect the activity and also the lifetime of microorganisms in wastewater treatment plants (WWTP). Research is focused on respiration inhibition of microorganisms contained in activation sludge from WWTP and their affected by dishwashing detergents. In view of Regulation No 259/2012 of the European Parliament and of the Council concerning the limitation of the total phosphorus content of dishwashing detergents (into force on 1 January 2017), there have been significant changes in the structure of these detergents. The article describes the effect of selected dishwashing detergents on respiratory inhibition of activation sludge from a large municipal WWTP Ostrava and a small municipal WWTP Michálkovice. Both of these WWTPs are owned by OVAK (Ostrava waterworks and sewerage). Subsequently, the research is focused on the comparison of obtained results. The highest variation in values were measured for sample 3, where the inhibition measured when testing a sludge from a large WWTP differed by up to 60% from that measured when testing a sludge from a small WWTP. The research also evaluates possible causes of respiration inhibition of microorganisms when testing specific sample solution.
Soil seed bank in Ostrava post-mining landscape
Authors: Plohak P , Svehlakova H , Rajdus T , Stalmachova B
Published: February 2020

The paper deals with analysis of soil seed bank of Odra and Oderka heaps in Ostrava region. On selected sites, samples of soil were taken, slope and exposure was assessed and phytosociological relevés were conducted. 3436 seeds were extracted from 17 soil samples of Odra heap and 5701 seeds from 15 soil samples of Oderka heap. Almost 90 % of extracted seeds belong to Betula pendula species. Woody plants and grasses dominated in examined samples. Composition of soil seed bank was compared with vegetation of selected heaps using Sørensen index. Influence of slope and exposure on distribution of seeds in soil seed bank was assessed by multivariate analysis (RDA, DCA).
Analysis of trends in precipitation time series in selected precipitation stations in eastern Slovakia
Authors: Repel A , Zelenakova M , Vranayova Z , Kanalikova A , Hlavata H
Published: February 2020

One of the most important aspects of climate change is the time distribution of precipitation and its historical changes. In this study, trend analysis of annual precipitation, daily maxims and days without precipitation in three precipitation stations in eastern Slovakia is presented. These are stations Poprad, Košice, and Kamenica nad Cirochou. Individual trends are compared and evaluated. Significant positive trend was observed in maximum daily precipitation in Kamenica nad Cirochou station and in total annual precipitation in Poprad station. Moderate positive trend was observed in maximum daily precipitation in Poprad station and number of days without precipitation in Kamenica nad Cirochou station. No trends were observed in Kosice station.
Legislation governing wastewater discharges in the Czech Republic
Authors: Singrova V , Hlustik P
Published: February 2020

The aim of this article is to describe and compare individual laws concerning wastewater discharges and their monitored indicators. Relevant laws and government regulations have been in existence since 1953, when the Central Administration of Water Management was established, with the latest regulation being Government Decree No. 401/2015 Sb. This article deals with the development of legislation, its amendments and improvements. This results in a gradual adjustment of the monitored indicators and decreasing indicator values in connection with improving treatment processes and technologies. This is also related to the Czech Republic’s accession to the EU and the adoption of Council Directive 91/271/EEC, which emphasises, inter alia, environmental protection.
Orthoptera insects as bioaccumulators of potentially toxic elements (Ostrava city, Czech Republic)
Authors: Zaoralova Z , Kupka J , Stalmachova B
Published: February 2020

This paper explores whether orthopteran insects (Orhtoptera) may be used to study bioaccumulation of potentially toxic elements in their bodies on the territory of Ostrava City. For the purpose of laboratory analysis, we used a common species Metrioptera roeselii (Ensifera) and Chorthippus parallelus (Caelifera). The laboratory analysis confirmed a bioaccumulation of some potentially toxic elements (Ni, Zn, Cu, Cr), which is probably dependent on the distance of the sources of pollution and main wind direction.
Rheological Characteristics of Reclaimed Asphalt Pavement (RAP) Evaluation using Reclamite Rejuvenating Material
Authors: Twidi Bethary Rindu , Sugeng Subagio Bambang
Published: February 2020

Using reclaimed asphalt pavement (RAP) does not only reduce costs but is also environmentally friendly. In its use, it is very important to know the empirical and rheological properties of the asphalt. The testing in this study used a Dynamic Shear Rheometer (DSR) to test asphalt pen 60/70, RAP and Reclamite rejuvenating material mixed with RAP. The results of the pen asphalt 60/70 empirical test met the Bina Marga 2010 General Specifications of Roads and Bridges, while the RAP showed the characteristics of an aging asphalt. In the rheological test based on SUPERPAVE, from the value of the performance grade (PG), it was found that Reclamite reduced the critical temperature value on RAP, so the PG value was the same as the asphalt pen 60/70. The master curve results also showed that Reclamite can reduce the RAP stiffness modulus near the value of asphalt pen 60/70 stiffness modulus. Meanwhile, as seen from the results of the black diagram, the original condition has a range of phase angle (δ) greater than the RTFOT and PAVT conditions because the asphalt has undergone aging. At the same Sbit, asphalt pen 60/70 has a greater (δ) than RAP, while for RAP added with Reclamite, the value is between the RAP and asphalt pen 60/70 value. This illustrates that the Reclamite rejuvenating material makes RAP more viscous.
Engine Performance Characteristics of a Compression Ignition Engine Fuelled by Traditional Diesel and Waste Cooking Oil
Authors: Xuan Thanh Dinh , Viet Nguyen Thanh , Vu Minh Dien , Duc Nguyen Khanh , Nguyen Duy Vinh
Published: February 2020

This research presents a comparison of the test engine’s performance characteristics fuelled by diesel and waste cooking oil synthetic diesel (WCOSD). Commercial diesel (CD) fuel used in this research was commercial diesel in the market; meanwhile, WCO was manufactured from cooking waste product using Catalytic Cracking Method. The synthesizing process known as Catalytic Cracking Method at pilot scale level using non-food oil such as waste cooking oil to manufacture biodiesel fuel oil in place of diesel with a stable energy output. The results of this research showed that it can be concluded that the engine torque with WCO drop from 1.9 Nm to 5.4 Nm at all speed while the BSFCs drop at almost speed at full load condition compared to that of CD. The BTEs of the engine fuelled with WCOSD are higher than that of the engine fuelled with CD at almost engine speed at full load. The result of this research is the foundation for using WCO in worldwide application.
Various Flow-Field Designs for Enhancing Fuel the Cell Performance of Proton Exchange Membrane Fuel Cells
Authors: Diep Tran Thi , Ha Vu Duc , Huang Shoudao , Vinh Nguyen Duy
Published: February 2020

The flow-field design is an essential key in the operation of fuel cells, it conducts main functions such as contributing reactants to the membrane electrolyte assembly (MEA) over gas diffusion layers, conductive part, clamping MEA as well as water management & thermal management and so on. As a result, it is necessary to optimize the flow-field design of fuel cells in order to enhance fuel cell operation characteristics. This paper shows numerical analyses of fuel cell characteristics based on 4 configurations of flow-field in order to find out the best design for enhancing fuel cell performance. The results showed that the different design of flow-field for the anode side and the cathode side can contribute to enhancing fuel cell operation characteristics due to their difference in water formation and discharge. Indeed, the fuel cell configuration with the serpentine flow field in anode side and the pin flow field in the cathode side is the best design because it leads to reducing the water flooding in the cathode side and drying in the anode side. The maximum power density of configuration 1-4 is 0.515, 0.528, 0.585, respectively. It means an improvement of 13.6% percentage can be observed. The research results of this research are the foundation of optimizing the design of the flow-field design.
Effect of Road Surface Contour to the Fatigue Life of a Coil Spring Based on Strain-Life Approach
Authors: Putra T E , Husaini  , Ikbal M
Published: February 2020

This study aims to determine the effect of road surface contours to the fatigue life of an automotive coil spring. A strain gauge was affixed at the critical point based on the stress distributions. The vehicle passed smooth and rough roads with the speeds above 30 km/h and less than 20 km/h, respectively. The strain signals obtained were analyzed using the Coffin-Manson, Morrow, and Smith-Watson-Topper models. According to the analysis, when the vehicle passed the rough road, the coil spring received a higher stress leading to a shorter fatigue life, of 1,284 cycles to failure. This value was 526 % lower compared to the smooth road because it consisted of bumps and holes.
Effect of Concrete Surface Crack Filling Conditions on Dominant Frequency of Surface Rayleigh Wave
Authors: Hoe Liew Chi , Wei Lee Foo , Ghuan Tan Chee , Zee Kwong Kok , Lim Kok-Sing
Published: February 2020

Elastic Surface Rayleigh Wave (R-wave) based non-destructive test (NDT) techniques have been studied broadly for concrete surface crack assessment in the past few decades. However, the effect of environment factors on the accuracy of R-wave NDT results are often being neglected. Sand and dust are ones of them that easily accumulate within the surface cracks of concrete structures, which potentially affect the characteristics of R-waves propagation when it travels through the concrete medium that containing cracks. This study is aimed to investigate the effect of concrete surface crack filling conditions to the dominant frequency of R-wave. Numerical simulations were conducted to study the changes of R-wave waveform when it propagated through a cracked concrete model with two various filling conditions, namely fine sand and charcoal powder. Fast Fourier Transform (FFT) for post-signal-processing (PSP) of raw R-wave signals to determine its dominant frequency. The results of numerical simulations were then justified by experimental measurements. It was found that the dominant frequency of R-wave is independent to the volume and the type of filling materials, but sensitive to the surface discontinuity of the concrete.
The Effect of Nano Ceramic Powders On Mechanical and Physical Properties of Normal Concrete
Authors: Jawad Kadhim Zainab , Raad Al-Adhadh Ahmed , Ali sabur Dhay
Published: February 2020

Concrete is one of the most important materials used in construction. Properties of concrete can be improved using additives like nano-ceramics which acts as reinforced phase to raise the mechanical properties of concrete. Effect of nano-powder on some properties of concrete has been determined. In this study, two concrete mixes have been prepared, first one, by adding different contents of nano–ZrO2, second using nano – Al2O3 powder. Properties of concrete have been studied through the compressive strength, Splitting tensile strength, workability and water absorption. Results showed that the slump reduced from 103 mm to 62 mm when 1.1% nano-zirconia added, the same behavior observed in mix that contain nano alumina powder. The compressive strength increases when nano-zironia added, the maximum value of compressive strength obtained when 0.7% nano-zirconia added (45.3 MPa at 28 days, 48.3 MPa at 60 days and 52.3 MPa at 90 days). Moreover, splitting tensile strength was improved with increasing nano-zirconia content and the maximum values were at 0.7% of nano-zirconia, (5.2 MPa at 28 days, 6.6 MPa at 60 days and 8.2 MPa at 90 days), water absorption decreased when nano-zirconia percentage increased (0.12 % at 28 days and 0.1 % at 60 and 90 days). In this research, it is also observable that nano alumina powder has more influence for enhancing concrete properties than zirconia powder. Compressive strength and splitting tensile strength of concrete mix with nano alumina increased highly with increasing content of Al2O3 and reach its optimum value at 1.1 % of Al2O3 in NA6. Alumina powder has a high ability to diminish pores size and to increase density of concrete mixture; so, low permeability, low water absorption concrete produced.
Photobioreactor Simulation for Microalgae Chlorella Cultivation in Process
Authors: Trofimchuk Oksana A , Romanenko Sofia A , Turanov Sergey B. , Yakovlev Alexey N.
Published: February 2020

Three-dimensional simulation of light fields in the photobioreactor for Chlorella cultivation was performed. It was shown, that light flux reduced due to the increase of optical density and growth of microalgae cells concentration. According to the fact that light intensity is an important factor, affecting growth rate and development of microalgae cells, process automation and light flux increase in dependence to Chlorella cells gain are needed to be introduced [1-3].
Nonlinear elastic analysis of concrete beams based on the Smeared Crack Approach
Authors: Betancourt N , Arias C , Durán F , Arana V
Published: February 2020

In the present study, an analysis of plain and reinforced concrete beams under monotonic loading was made based on the Fixed Smeared Crack approach. The objectives of this research were to analyze the nonlinear behavior of the selected cases of analysis and to propose an alternative and simple model for the analysis of beams under service loadings, by means of Committee 435 of the American Concrete Institute. A brittle model for concrete and a linear-elastic behavior for steel reinforcement bars were considered. Results are presented through force-displacement curves and the sequence of cracking propagation. Also, a comparison of calculated instantaneous deflections of simply supported beams was made between the proposed model and other researches. It was verified that the proposed algorithm can predict adequately the cracking process and the deflections of beams subjected to service loadings, taking into account experimental results from other authors.
Optical Properties of Cd-Free Quantum Dots-Based Fluorescent Film
Authors: Lin M Y , Lin W X , Chung S R
Published: February 2020

CuInS2/ZnS Cd-free quantum dots (QDs) have many characteristics, such as high quantum yield (QY), wide emission peak and adjustable light color. They are suitable for optical conversion materials and applies in solid-state lighting (SSL). However, they are not easily dispersed during encapsulation, resulting in the deviation of light color out of the white light area after encapsulation. In this study, we use thermal injection synthesis method to prepare CuInS2/ZnS and CuInS2/ZnS:Al QDs. In order to improve the dispersion of QDs, solution type of QD/PS-PE-BR-PS copolymer (SEBS) mixture was prepared by mixing QD and SEBS with different ratios (10, 20, and 30 wt%) to form a fluorescent film. The experimental results show that the emission wavelengths and QY of CuInS2/ZnS and CuInS2/ZnS:Al QDs are 533 nm, 84 % and 536 nm, 97 %, respectively. The emission wavelength of CuInS2/ZnS-based fluorescent film is 574 nm, while CuInS2/ZnS:Al-based fluorescent film is 582 nm. The CRI, luminous efficacy, chromaticity coordinates and correlated color temperature of 20 wt% CuInS2/ZnS-based fluorescent film excited by blue chip is 64, 42 lm/W, (0.33, 0.32), and 5443 K, respectively. On the other hand, we find that the CRI of CuInS2/ZnS:Al-based fluorescent film can be improved from 64 to 73, and the luminous efficacy is 51 lm/W.
Gravel Sampling for Testing
Authors: Al-Rumaithi Ayad , Al-Sherrawi Mohannad
Published: February 2020

Sampling is the selection of a representative portion of a material, and it’s as important as testing. The minimum weight of gravel field or lab sample depends on the nominal maximum particle size. The weight of the sample will always be greater than that portion required for testing. The approximate precision desired for the testing will control the weight of the gravel sample. In this study, gravel sample has been simulated by using multilinear approximated function for Fuller’s curve on the logarithmic scale. Gravel particles are divided into classes according to their medium diameter and each class was simulated separately. A stochastic analysis, by using 100 realizations in sampling, has been done and the root mean square error for the errors between sampled and target curve has been discussed for two selected samples of coarse aggregate.
Numerical Analysis on Seismic Performance of a New Type of Fully Assembled Beam-Column Joints
Authors: Zhai W , Jiang W , Yang J H , Yang J F , Qu K , Chen L
Published: February 2020

To investigate the seismic performance of a new type of fully assembled beam-column joints, finite element models are established by ABAQUS with the nonlinear and geometric nonlinear effects considered to simulate 5 joints based on the quasi-static test. Through the comparison between finite element analysis and experimental results, the validity of finite element models is verified. Then the correlation parameters and their effects on the seismic performance of joints are analysed.
Stable Colloidal Silica Particles Doped with a Fluorescent Dye
Authors: Mulikova Tomiris , Khamkhash Laura , Dukenbayev Kanat , Molkenova Anara , Sh. Atabaev Timur
Published: February 2020

In this study, we described the quick synthesis strategy of stable colloidal silica particles encapsulated with a fluorescent dye. Atomic Force Microscopy AFM, Fourier-Transform Infrared Spectroscopy FTIR, and Fluorescence Spectroscopy FS were utilized to characterize the obtained silica particles. AFM analysis revealed that obtained silica particles have a spherical shape with a mean size of 210 ± 13 nm. FS analysis showed that fluorescent dye was successfully incorporated into a silica matrix. In particular, eye-visible green fluorescence emission with a peak maximum at 526 nm was detected. The emission stability of prepared particles was tested in a biologically-relevant pH range, under constant UV irradiation and at different storage time intervals.
A Comparative Study of Hyperelastic Constitutive Models to Characterize the Behaviour of a Biopolymer Material for Diaphragm of Blood Pump Manufacturing
Authors: Belyaev L. V. , Zhdanov A. V. , Ivanchenko A. B. , Stepenkin A. V. , Kochetov D. O.
Published: February 2020

This article presents the results of the stress-strain state modelling of a blood pump diaphragm manufacturing from polyurethane ‘Vitur’ T-1413-85 for pulsatile type Ventricle Assist Device systems. Based on the analysis of the most distributed models of hyperelasticity, a model which most accurately describes the behaviour of the specified material has been determined (R2 = 0.9999 between numerical simulation and experimental uniaxial tensile tests data). Experimental studies have been carried out to determine the displacement of the diaphragm with a thickness of 0.3 mm and 0.5mm under the influence of control pressure. A comparison of the modelling results of the blood pump diaphragm stress-strain state and the conducted experimental studies on the determination of displacements confirmed the adequacy of the chosen model (R2 = 0.96 between numerical simulation and experiment) for both of the studied diaphragm thickness.
Forecasting Change of the Roller Screw Mechanism Efficiency on the Basis of a Comparative Analysis of Coated Surfaces
Authors: Belyaev L.V. , Zhdanov A. V. , Dovbysh N. S. , Morozov V.V.
Published: February 2020

The paper presents the results of the influence of materials, lubricants and the type of coatings in friction roller screw mechanism on the values of the coefficient of friction and the coefficient of efficiency required to predict the efficiency of the drives. Theoretical studies were carried out for different types of roller screw mechanism coatings. The results can be used to predict the functional characteristics of the mechanisms during their design.
Development of Fire Information Integration Application Platform
Authors: Chen Ching-Shun , Ho Yu-Tsung , Chen Yi-Lin , Chou Chung-Chyi
Published: February 2020

The aging society is a challenge facing all countries in the world. The collection and analysis of fire information in elderly care institutions has become a key factor in seeking shelter time. This study will build a fire information platform and its reporting mechanism through HTML, PHP, MySQL and other software development tools, and through the source and distribution of fire information. Public announce technology to improve the fire response capacity of the elderly institutions. This paper quotes Marchant (1980), a British scholar, who regards fire and refuge action as the parameters of elderly people’s refuge. The system of fire information platform consists of three parts: the “manager interface”, “cloud database” and “fire information platform”. The results show that the fire information reported after the confirmation of the management personnel can improve the residents’ confidence in the source of the information. The test results in the experimental field show that the higher the integrity of fire information content and the more rigorous distribution process are, the more helpful it is to shorten the judgment time of pre-avoidance tragedy, and the visual fire information platform is helpful to the correct judgment of the refuge route. Adding a call button to the platform can also increase residents’ sense of security. Fire information integration platform can help elderly care institutions take immediate shelter action in case of fire.
Use of Galactose Oxidase in Hydrazide-Capturing Technique to Isolate N-linked Glycoallergens from Olive Tree Pollen
Authors: Napoli A.
Published: February 2020

In this work, a simple method hydrazide-capturing technique followed by MALDI MS and MS/MS analysis for characterization of major pollen allergens of Olea europaea pollen was exploited. The strategy developed has different stages: devising of sample preparation protocol to sequester glycoproteins from a crude extract, and allowing the identification of antigenic peptides, glycosylation sites and modified glycans by MALDI MS and MS/MS.
Research on Aerial View Point Planning of Drone based on Multi-View
Authors: Yan-yan Shi Yun Zhu
Published: February 2020

For multi-view viewpoint planning research, Firstly, using the UAV aerial multi-view image, the viewpoint view is first to establish a candidate view area according to the shooting distance. Secondly, the sub-viewpoint set is filtered and the view points are complemented by the region where the candidate view cannot be photographed, so that the three-dimensional reconstruction data has better integrity. Thirdly, the influence of camera incident angle on image pixel error is analyzed, and the corresponding 3D model is established. Finally, the stereoscopic overlap is used to perform viewpoint screening under the premise of ensuring image quality and shooting coverage. The experimental results show that the proposed viewpoint planning method has high coverage and the reconstruction accuracy is below 0.1% of the target size.
A Simple Modification of HLLEM Approximate Riemann Solver Applied to the Compressible Euler System at Low Mach Number
Authors: Yu Hang , Li Hua , Lai Jianqi , Zhang Ye
Published: February 2020

Due to its attractive properties in computing compressible flows, such as sharp capturing of discontinuities, satisfying entropy condition and positivity preservation, the HLLEM approximate Riemann solver has been widely applied for simulations of many compressible flow problems. However, when it comes to weakly compressible or incompressible flows, the HLLEM scheme cannot give physically correct solutions. In the current study, a simple low Mach number fix is applied to improve the accuracy and stability of HLLEM approximate Riemann solver in the low Mach limit. As a result, a modified HLLEM scheme called LM-HLLEM scheme is proposed. Numerical results demonstrate that the proposed LM-HLLEM scheme is able to compute various flow problems accurately and robustly ranging from compressible to low Mach incompressible flows.
Effectiveness of Variable Rotor Blades Technique&Variable Stator Vanes Technique in AdjustingAxial-flow Compressor
Authors: Bingxiang Long , Qin Chen , Zebin Ren , Daxiong Liao
Published: February 2020

Multi-stage Axial-flow compressor is the main driver of continuous transonic wind tunnel and it usually has ultra-wide operating range. High performance wind tunnel generally requires its multi-stage axial-flow compressor has high economic performance and stability in its ultra-wide operating range. The combination of variable compressor rotational speed and variable geometry technique, variable rotor blades technique (VRBT) and variable stator vanes technique (VSVT), has been widely adopted in extending the stable working range with high efficiency of multi-stage axial-flow wind tunnel compressor. Adjusting Effectiveness was defined in this paper to quantify the effectiveness of VRBT and VSVT in extending stable and high aerodynamic efficiency operating range of wind tunnel axial-flow compressor under various operating conditions. The results show that the adjusting effectiveness of VRBT and VSVTis a function of reaction degree, flow coefficient, loading coefficient and the amount of loading coefficient change.
Modeling and Numerical Simulation of Stratospheric Aircraft Propulsion System
Authors: Yuan Xingjun , Wang Jiming , Tong Xuan , Wei Fengmei
Published: February 2020

Aiming at propulsion system of stratospheric, a high altitude propeller was designed. Avoiding the singularity of equations in the iterative process, the interference angle equation was improved and the designed propeller was calculated by the strip theory. The three-dimensionalNavier-Stokes equations were used to simulate the complex flow around the designed propeller and its aerodynamic characteristics were analyzed, in which the k-ω turbulence model was used. The accuracy of the numerical simulation was determined by the calculation of different grid numbers. The results show that the designed propeller can satisfy the requirement of propulsion system and the strip theory and numerical simulation can provide the reference for the design of stratospheric propeller.
Fluid-structure Interactions on Steerable Cruciform Parachute Inflation Dynamics
Authors: Gao Xinglong , Zhang Qingbin , Chen Qin , Wang Wenkai
Published: February 2020

To develop the decelerating and rigging potential performances of cruciform parachute during to its relatively large stand-off with lower cost production in precision aerial delivery operations, the fluid structure interaction behaviours of steerable cruciform parachute is studied. The concept of suspension lines control of cruciform parachute is firstly proposed. Based on the multi-material Arbitrary Lagrange-Euler method, the coupling dynamic model between a viscous incompressible fluid and a flexible large deformation structure of the cruciform parachute is solved. The inflation performance of a cruciform parachute under different steerable conditions is analysed. The decelerating parameters of the parachute, including drag area, and opening loads are obtained from FSI simulation. Meanwhile, the evolution of the three-dimensional shape of the cruciform parachute inflation is predicted.
Research on FMEA Application in Assembly Process of Complex Space Probes
Authors: Wang Chenxing , Feng Wei , Wang Linzheng , Song Song
Published: February 2020

The process of developing new spacecraft is time-consuming and task-intensive. This paper analyses various problems existing in the application of spacecraft FMEA, and points out that it is necessary to it is necessary to assure the validity of FMEA work, including normative FMEA work carried out in time, comprehensive identification of failure modes and their causes, correct expression of failure modes and their causes and effects, and the pertinence and maneuverability of measures to be taken. Taking the development of Mars rover as an example and considering the actual situation, the assembly process and FMEA agreement are proposed and formulated. According to the development process, the failure modes, causes and effects (severity) of the main processes are analyzed. The risk sequence number (RPN) is obtained by combining the frequency of occurrence and the difficulty of detection. Finally, through sorting out the assembly work and key points in each stage of AIT, 60 processes and 95 failure modes are analyzed, the possible weaknesses are found out, and the control methods and measures are put forward, so that the RPN values are below 12. Improve the quality and efficiency of product development by strengthening FMEA management, and ensure the smooth development of Mars probe on.
VISHKIRA, A Gallinaceous Aircraft
Authors: Taneja K , Jaiswal R , Kalwala S K
Published: February 2020

A Vishkira is an idea of a gallinaceous aircraft useful for military purposes. It is the modest version of morphing of wings and Ornithopter. This aircraft can morph itself by decreasing its span length by folding mechanism and locked at the folded position by electro-magnetism. The folded mechanism in wings uses electro hydraulics. This provides the flexibility to pass through narrow passages between mountains avoiding the aircraft to tilt and accomplish the military mission and also have an advantage of flying like a bird by flapping its wing as in Ornithopter producing a huge amount of thrust in a single flap of the wing. This provides a convenience of having a shorter runway which is suitable for military aircrafts when they are in a need of emergency take-off.
Research on Civil Aircraft Emergency Evacuation Time for Ditching
Authors: Yang Wu
Published: February 2020

Emergency evacuation for ditching is an important airworthiness requirement for civil aircraft to ensure safety. However, to demonstrate the emergency evacuation for ditching of a real aircraft is a time-consuming and laborious test with significant safety risks. Based on the analysis of airworthiness clauses, this paper proposes a method for calculating and analysing the emergency evacuation time for ditching. Taking a certain type of aircraft as an example, a typical case is selected for calculation and analysis, and the evacuation time under this typical case is obtained, which provides data support for the airworthiness emergency evacuation airworthiness compliance.
The Comfort Design for Civil Aircraft Cabin Using Ergonomics Theory
Authors: Yang Wu , Tengfei Mu , Haiqiang Wang
Published: February 2020

In order to improve the comfort of civil aircraft cabin, the cabin comfort system is built in this research based on the ergonomics theory and considering the influence of cabin environment, facilities, configuration, etc. In this process, filtrating and classification for the indexes which mainly influence the comfort are conducted, weight value setting is completed according to the analytic hierarchy process method and the quantify score for all the indexes is pushed. Finally, the results of cabin comfort evaluation are obtained. The case analysis results verify the effectiveness of the method. To sum up, based on this method proposal in this research, the main factors that can influence the comfort of the cabin are obtained, the comfort factors of the cabin are quantized and analysed, and last, these research results could direct the cabin comfort design.