bluuebunny/crossref_metadata_2025 huggingface dataset:
Development prospects of introduction of innovative technologies 3d-printing in Kazakhstan
Authors: Mukhamadeyeva Railya
Published: January 2020

The article describes material about the main prospects that require research for the implementation and operation of new additive technology in the Republic of Kazakhstan. The main problems of introducing new technologies are considered. New technologies, in the broad sense of their presence, or absence, determine the strategic position of the national economy in the world. The availability of technologies provides scientists or designers with powerful tools for the implementation of new ideas. The lack of technology limits the creativity of scientists and engineers, forcing them to apply outdated technical solutions that are in their possession, rather than those that enable them to achieve the new goals. Therefore, technology itself is a major part of innovation. The market situation is changing and only interested consumers remain. Market trends for the next decade are discussed. Furthermore, the article also discusses the advantages of introducing CAD systems into the educational process and software products of the COMPASS family.The Republic ofKazakhstan needs competent specialists who can apply the most modern technologies. As 3D printing technology advances and more people are exposed to it, they realize it can be applied to many different problems in many different fields; thus the opportunity for innovation is tremendous.
Raster electron microscopy of electroerosion titanium-tungsten-cobalt powders
Authors: Ageeva E V , Altukhov A Yu , Pikalov S V
Published: January 2020

One of the promising methods for producing nanopowders, from virtually any conductive material, including cemented carbide, is distinguished by relatively low energy costs, harmlessness and environmental cleanliness of the process, the absence of mechanical wear of equipment, obtaining powder directly from pieces of cemented carbide of various shapes in one operation, obtaining particles of predominantly spherical form is the method of electroerosive dispersion (EED). The purpose of this work was to study the shape and morphology of the surface of powder particles obtained by electroerosive dispersion of solid waste T30K4 in alcohol using a scanning electron microscope. On the basis of the conducted research, it was established that the shape of the powder particles obtained by EED dispersion of solid waste grade T30K4 in alcohol is determined by the form in which the material is ejected from the well in the EED process. It is noted that spherical particles are obtained by crystallization of molten material (liquid phase), and fragmentation-shaped particles are obtained at brittle fracture. It is established that particles with a regular spherical or elliptical shape prevail in the powder.
Stand for optimization of thermo-force processing of shafts
Authors: Bobrowskii Alexander , Drachev Oleg , Kravtsov Alexey
Published: January 2020

The article discusses the design of the stand for the diagnosis and determination of the optimal modes of thermo-force processing (TFP) of light-hard long shaft-type parts. The stand is equipped with an automatic control system (ACS) for heating, cooling and axial plastic deformation. ACS includes three control loops. The functional scheme of the stand and its operation algorithm are described.
Prospects for the Development of Ultra-Jet Dispersion Technology for Nanocontaining Suspensions
Authors: Htet Kyaw Myo , Galinovsky A L , Provatorov A S
Published: January 2020

The article deals with the actual problem of the dispersion of nano-modifiers. At present, the methods used for dispersing are not sufficiently effective and often do not provide the necessary dispersion of nanoparticles in suspensions. The solution to the problem can be found in the application of ultra-jet technology, which allows, as shown in the article, to provide a fairly high level of dispersion. The studies were carried out as part of a grant from the President of the Russian Federation for state support of leading scientific schools (NSh-3778.2018.8) and a grant from the Russian Foundation for Basic Research 18-29-18081.
Evaluation of energy consumption for the object motion optimal control
Authors: Bokhonsky A , Varminskaya N
Published: January 2020

The energy asymptotic reduction for the optimal control of the “acceleration-deceleration” type (with increasing of the degree of the polynomial that sets the type of optimal control) while realizing the motion purpose is revealed and investigated. For a fixed minimum possible motion time, the object is moved as an absolutely solid or deformable body from the initial state of quiescence to the final state of absolute quiescence. It is shown that the acceptable motion time of an elastic object is found from the moment ratios - the equality to zero of the relative displacement and the relative velocity at the end of the motion. Using the example of a system with one degree of freedom, it is shown that the moment relations are a system of transcendental equations with many mutual roots. The considered class of controls is applicable for the elastic objects optimal motion in modern technology.
An Investigation on Urban Circle Rail Transit: A Case Study on the Alignment of Mass Rapid Transit 3 (Circle Line)
Authors: Mohamed A A , Wei E J , Ramadhansyah P J , Farooqi M A , Satar M K I M , Mashros N
Published: January 2020

Mass Rapid Transit (MRT) is one of the important components of the Greater Kuala Lumpur (KL) development plan. It consists of three line-systems and would be finally operated by Klang valley public transport system. These three lines are aligned on the concept of wheel and spoke pattern that encompasses two north-south radial lines as well as a circular line (also known as ring line) circulating around KL and enclosing the central business district. However, fixing the locations of the stations has become an issue. The aim of the paper is to find out the optimal alignment for the ring line with respect to the total passenger benefit. A numerical-analytical model has been used to determine the optimum radius for the proposed ring line in a city. Passenger route choice for many-to-many, origin-destination (OD) pairs is analysed using radial-only rail network and rail network with ring lines of varying radii. The route choice takes into consideration three separate options including a) direct access to destination, b) taking only radial lines, and c) taking a combination of radial and ring lines. Several important parameters such as access cost, ride cost, and transfer penalty, are the main aspects to evaluate the optimality of the ring line. Microsoft Excel has been used to run the cost-benefit optimization model with the aim of obtaining an optimal radius of ring line. Results show that the net benefit of presenting a circle line in the KL by manipulating the passenger’s cost for each OD pair. Finally, the optimum alignment of MRT circle line in KL has been proposed.
Assessment of safety performance level on simple urban residential building: Case study at Bogor city Indonesia
Authors: Lutfi M , Arien H , Hendrawati M , Ramadhansyah P J , Ramli N I
Published: January 2020

Simple urban residential building must meet the technical requirements set forth in the building and structure law number 28 of 2002. In the city of Bogor, especially in the densely populated village of Kayumanis, there are areas that have the potential of landslides. In that area, there are some houses that have been damaged by the movement of land and landslides that can threaten the safety of its inhabitants. Therefore they need to stay aware about potential collapse of several parts of house structures, and then understand how to evacuate to safer area, outside of the house after the incident was stopped. Based on these conditions, it is necessary to evaluate buildings in accordance with FEMA on the safety level of buildings. The structure and modeling analysis using SAP 2000-V10 and Indonesia Standard. Specification of simple urban residential building using the reinforced concrete material with the quality of concrete (fc’) 17 MPa, 15x15 cm column dimension, 15x18 cm beam dimension and 4D12 BJTP main reinforcement, and shear reinforcement D8-20. The results of the analysis of urban residential building structures shown in 3D form, obtained values for column structure elements almost close to failure are marked with orange color, while for the element of the beam structure is declared safe marked with green color. From result of modeling analysis referring to FEMA 356 obtained value C0 = 1.0; C1 = 1.378; C2 = 1.0; C3 = 1.0; Sa = 1.011; and Te = 0.2206, which states the value of the displacement target is 0.02 m which is categorized to be at ‘The Life Safety’ (LS) performance level. This means that if there is a movement of land, the structure of the house is declared stable and has adequate service capacity and damage non-structural part is still controlled.
Numerical Modelling of Scale Effect on Mode of Failure and Strength of Offset Rock Joints
Authors: Mughieda O , Alkhedher M , Hazirbaba K
Published: January 2020

The studies on the scale effect on the behavior of non-persistent rock joints are limited and the nature of scale dependency is still not well understood. In this study, the scale effect on failure mechanisms and compressive strength of rock blocks tested previously by the authors was investigated numerically. In the experimental study; two different block sizes, having dimensions of (63.5 x 28 x 20.3) cm and (30.5 x 15.24 x 10) cm, were tested. Samples of rock with non-persistent offset joints were subjected to uniaxial loading. The joint inclination angle was maintained at 22.5° in both cases. Also, degree of persistence was kept constant at 0.3 for all tested blocks. However, the offset angle which connects the inner tips of the joints was changed from 30°-90° with an increment of 15°. In the current study, finite element analyses were performed on the arrangements that were studied experimentally. ANSYS 19 Mechanical APDL was utilized to perform static structural analysis. A linear elastic material was assumed for these analyses, mainly because there were no signs of major material damage prior to fracture. Modulus of elasticity of approximately 10510 MPa and a Poisson’s ratio of 0.25 were assumed. The boundary conditions applied to the finite element model were zero vertical displacement along the bottom edge, and a uniform distribution load on the top surface, the magnitude of which was approximately the measured coalescence load (in MPa) for the joint geometry analyzed. The stress distribution within the block and near the tips of joints in particular was analyzed in terms of maximum principal stresses, shear stresses and factor of safety resulted from maximum tensile stress theory. The FEM results were compared with the experimental results. The results of FEM emphasized the observed experimentally results regarding the decrease in strength as the size of block sample increased and no effect of block size on mode of failure.
Volumetric Properties and Resilient Modulus of Stone Mastic Asphalt incorporating Cellulose Fiber
Authors: Fauzi N A N Md , Masri K A , Ramadhansyah P J , Samsudin M S , Ismail A , Arshad A K , Shaffie E , Norhidayah A H , Hainin M R
Published: January 2020

Stone mastic asphalt (SMA) is well known as a high coarse aggregate content that interlocks to form a stone skeleton that resist permanent deformation. However, it facing a lot of problems such as rutting and stripping because of the high temperature and repeated axial load. It also suffers with creep issue. The cellulose fiber is a type of synthetic fiber that can enhance the properties of asphalt mixture. Thus, the aim of this study is to utilize the cellulose fiber that has high tensile strength to overcome the problem of SMA. Among the tests involve are Resilient Modulus, Marshall Stability and Cantabro Loss. From the results, it shows that the addition of cellulose fiber improved the recovery ability of asphalt binder. From each test, the addition of 0.2% cellulose fiber contributes to lowest value of abrasion, while 0.3% producing highest value of resilient modulus. Thus, the addition of cellulose fiber is capable in enhancing the properties of SMA.
Effect of Unground Palm Oil Fuel Ash as Partial Sand Replacement on Compressive Strength of Oil Palm Shell Lightweight Concrete
Authors: Wan Ahmad S , Muthusamy K , Hashim M H , Albshir Budiea A M , Ariffin N F
Published: January 2020

Concern towards degradation of environment due to increasing use of natural sand in construction industry and dumping of solid wastes from palm oil industry namely palm oil fuel ash and oil palm shell has lead towards the development of environmental friendly concrete. The present study investigates the effect of unground palm oil fuel ash as partial sand replacement towards workability and compressive strength of oil palm shell lightweight aggregate concrete. Two types of mixes were used. Control specimen was prepared using 100% natural sand. Another type of mix were prepared by integrating 5%, 10% and 15% unground palm oil fuel ash by weight of sand. The concrete mixes workability were investigated by conducting slump test in accordance to standard. All specimens were made in form of cubes (150mm x150mm) and water cured up to 28 days. The compressive strength test was carried out in accordance to BS EN12390: 3 at 1, 4, 7 and 28 days. The finding shows that integration of 10% unground palm oil fuel ash contributes to the enhancement of oil palm shell lightweight aggregate concrete properties. Success in using unground POFA as partial sand replacement in concrete production would reduce quantity of ash disposed as waste and save the consumption of natural river sand.
Rock mass classification for rock slope stability assessment in Malaysia: a review
Authors: Salmanfarsi A F , Awang H , Ali M I
Published: January 2020

Rock mass classification systems are commonly used in the design and construction of rock engineering, and have seen widespread modifications and validations by various researchers over the last few decades. The rock mass classification, in particular the slope mass rating (SMR), continues to be the preferred preliminary method in small-scale assessment of rock slope stability. In Malaysia, parameters related to rock slope stability assessment have been modified to consider the condition of the rock mass such as the effect of heterogeneous rock units and weathering of rocks. The application of rock mass classifications however have been shown to contain some discrepancies, and the acknowledgement of the limitations of the system is important for an optimum use in the design stage. This paper reviews several development of rock mass classifications in Malaysia, as well as looking at potential direction of further development of the rock mass classification system in the context of local slope stability analysis.
Preparation of Sintered Glass-Ceramic from CRT Glass and Red Gypsum Wastes for Tiling Application
Authors: Idham M M , Haniza M M
Published: January 2020

This study aims to prepare sintered glass-ceramic (SGC) from a combination of cathode ray tube glass and red gypsum wastes specifically for tiling application. Bentonite clay which acted as a binder was also added to the prepared formulation. The starting materials were milled individually, mixed and compacted into button shape by using a uniaxial hydraulic press machine. The effects of sintering temperature and red gypsum content on the physical- mechanical properties and crystallization behaviour were investigated. The test results revealed that the glass-ceramic sintered at 850°C with 20 wt.% of red gypsum gave the best combination of physical-mechanical properties. Modulus of rupture and linear shrinkage were measured at 33.75 MPa and 6.47 %, respectively. Water absorption was low enough and recorded at 0.4759 % while the density was measured at 2.6638 g/cm3. The results also discovered that increasing red gypsum content by 10 wt.% and sintered at similar temperature deteriorated the quality of the glass-ceramic. Therefore, this particular sintered glass-ceramic has the potential to be used as outdoor walkway tile or brick owing to the high physical-mechanical properties, colour suitability as well as low production cost.
Properties and Flexural Behavior of Self-Compacting Concrete with Added Coir Fiber And POFA
Authors: Iman Afif , Mohamad N , Raain Fasya , Sofia Anis , Mydin Azree , Samad A A A
Published: January 2020

This paper presents the mechanical properties and flexural behavior of self-compacting concrete (SCC) with addition of 0.2%, 0.4% and 0.6% coir fiber (CF) as filler, and 10% palm oil fuel ash (POFA) as partial cement replacement. Fresh SCC-POFA-CF mixture was tested under slump flow and J-ring tests to determine its workability. SCC-POFA-CF cubes and cylinders were tested under compressive and tensile tests to determine its compressive strength, tensile strength, and flexural strength, while prisms were tested under four point bending load to determine its flexural behavior. It is found that workability of SCC-POFA-CF decreased when CF increased. The optimum percentage of CF in SCC mixture was found to be 0.4%. SCC-POFA-CF experienced less crack compared to the control specimen. This shows that CF in SCC prisms managed to control the crack propagation.
Study on The Effects of Plastic as Admixture on The Mechanical Properties of Cement-Sand Bricks
Authors: Fai Chow Ming , Khalili Rosidan Muhammad Amin
Published: January 2020

Cement-sand bricks is one of the building materials that being used as alternative for a low-cost house in Malaysia. Nowadays, many researchers have been researching for green and sustainable materials to replace conventional building materials. In this paper, plastic bottle has been studied as a new alternative admixture in cement-sand brick production. The objective of this research is to determine the effect of plastic size on mechanical properties of cement-sand bricks. The lab testing used for this research are compressive strength and water absorption tests. Based on the findings, the bigger size of plastic added into the brick mixture, the higher compressive strength can be achieved. This is due to the plastic can increase the structural integrity of the cement-sand brick. Also, the bigger size of plastic added into the mixture, lower rate of water absorption was obtained. This may be due to plastic help in reducing the volume of void of the cement-sand brick. Further studies are needed to improve the cement-sand brick production with plastic as admixture material.
Finite Element Analysis of Coated (Intumescent Coating Protection) Cellular Steel Beam (CSB) Expose to Fire
Authors: Zakwan F A A , Krishnamoorthy R R , Ibrahim A , Ismail R
Published: January 2020

Traditionally, standard composite steel beam section acts as a load bearing structural element to sustain an external load. However, in the event of fire, an additional fire load acts on the composite steel beam section. The combined action of the former and latter would accelerate the vertical deformation of the beam. In the case of cellular steel beam (CSB), the vertical deformation predicted to be higher. Due to these circumstances, the structural behaviour of the composite CSB were compromised leading to the critical failure mode of web-post buckling and Vierendeel bending failure. Therefore, it is crucial to evaluate the behaviour of the composite CSB at elevated temperature under both loading action. In this research work, validation process was initiated between the numerical simulation analysis of CSB exposed to the fire with the readily available experimental data work. The validated model was then used to simulate the composite CSB with newly added fire protection material of intumescent coating. From the finite element simulation, the predicted vertical deformation slightly decreased for thicker intumescent coating application onto the beam surface. In conclusion, by applying the intumescent coating, further improvements were predicted for the vertical deformation and subsequently maintains the strength of the composite CSB at elevated temperature.
Factors Affecting Safety Performance of Construction Projects: A Literature Review
Authors: Abas N H , Yusuf N , Suhaini N A , Kariya N , Mohammad H , Hasmori M F
Published: January 2020

The construction industry is known as the most hazardous industry and has always been plagued with accident for a long time. Incidents or accidents that happened at construction sites has caused several drawbacks of project performance, such as delay in project completion, increase project cost, reduce productivity and create negative impressions to the organization. Therefore, it is crucial for employer to ensure safety and health at the workplace is taken care of to avoid accident. This paper presents the review of the factors affecting safety performance of construction project, focusing on project level. Among the most frequently cited factors that affect safety performance of construction project in project level are safety training, implementation of safe working environment and implementation of safe plant and equipment. The outcomes of the paper may serve as a starting point for further research in investigating the main.
Improvement for significant clauses in the standard form of contract for industrialized building system construction
Authors: Mohd Fateh Mohd Ashraf , Zakariah Hanah , Ema Ezanee Shaiifa
Published: January 2020

Industrialized Building System (IBS) has been introduced in Malaysia since the 1960s. The government has come out with varies strategic blueprint to push IBS as a national agenda. Unfortunately, the pace of adaptation of IBS is still slow and below the government’s target. Construction players are still facing various issues when adopting IBS particularly on contractual and procurement aspects; thus it contributes to the low adoption of IBS in Malaysia. Lack of provision in the Malaysia standard form of contract is one of the issues. There are six (6) significant clauses in the Malaysia standard form of contract that can be improved to make it more conducive to IBS construction approach. Therefore this research will attempt to investigate the factors of improvement for the six (6) significant clauses in the standard form of contract with IBS construction. A semi-structured interview was used in the data collection exercise. The study revealed that there are eleven (11) factors of improvement for the six (6) significant clauses in the standard form of contract with IBS construction approach. The findings will be useful in order to enhance the local standard form of contract to suit the IBS construction approach hence able to accelerate the adoption of IBS construction in Malaysia.
The on-site waste minimization practices for construction waste
Authors: Fikri Hasmori Muhammad , Faizul Md Zin Ahmad , Nagapan Sasitharan , Deraman Rafikullah , Abas Norhaslinda , Yunus Riduan , Klufallah Mustafa
Published: January 2020

Rapid development in construction industry had caused the increasing of construction waste. This situation brings many negative impacts towards the environment, cost, productivity, time, social and economy. The increasing of construction wastes is mainly due to the inefficient waste management practices in the construction projects. Hence, the effective management practices in handling construction waste should be highlighted. This study seeks to identify the waste management practices that are able to engender on-site waste minimization. As much as 54 practices had been found from previous research publications. Mapping technique was used to determine the frequency for each practice. This study have found five (5) significant management practices that need to be emphasized in order to achieve on-site waste minimization. The findings of this paper will help researchers to further investigate the significant management practices in minimizing on-site construction waste.
Traffic Noise Assessment among Residential Environment in Batu Pahat, Johore, Malaysia
Authors: Segaran V C , Tong Y G , Abas N H , David Daniel B , Nagapan S , Kelundapyan R
Published: January 2020

Noise pollution arises as a severe problem to the community and ground transportation has highly impacted noise environment of the neighbourhood. In the present study, six stations were selected from three different locations in order to assess the traffic noise impact among residential area along Jalan Kluang, Batu Pahat. The objectives of this study focused on two main stages: (1) determination of noise indices; and (2) assessment of traffic noise impact. The noise indices such as equivalent continuous noise level (LAeq), noise level exceeded 10% (L10), 90% (L90) and the maximum noise level (LAFmax) of peak hours measurement time were determined using sound level meter (SLM) at all six stations. Besides, traffic noise index (TNI) and noise pollution level (LNP) were calculated based on the measured noise indices to expose the traffic noise impact. Overall, the result of the present study showed that residential area faces traffic noise disturbance partially whereby 50% of the stations exceeded the DOE standard which was 55dBA. Nevertheless, the residents living nearby Jalan Kluang are commonly facing traffic noise nuisance, but stations located further inside residential areas tend to have more residential background noises apart from traffic influence.
The Modified Evolutionary Algorithm for the Algorithms’ Chain Formation that Improve Gradient Images
Authors: Belov V V , Lopatin A K
Published: January 2020

The problem of improvement of images, in implementation process of automatic control of the geometrical sizes of the products which are on the conveyer belt is considered. The purpose of work is development of the method of automatic structural and parametrical identification of the combination of algorithms for the solution of the problem of preprocessing of images. Serve as input parameters of the system: the image of the controlled product in the RGB format and the image standard in the bitmap. The algorithm of correction of defects of the image and the subsequent selection of edges is offered adapting to shooting conditions (camera type, its permission and surface illumination). On the output the vector of operators and their parameters forms.
Recurrent Neural Networks’ Configurations in the Predictive Maintenance Problems
Authors: Demidova L A
Published: January 2020

The possibilities of various configurations of the recurrent neural networks in solving the problems of the maintenance performance based on the multidimensional time series have been investigated. The typical examples of the maintenance performance’ problems from technical and medical diagnostics have been considered. The configurations’ examples of the one- and two-layer recurrent neural networks with the RNN, LSTM, and GRU neurons for the aircraft engine maintenance problems have been given, the graphical dependencies of the development’ results of the neural network models, the estimates of the development time, and the estimates of the accuracy indicator have been presented. The conclusions about the advantages of the recurrent neural networks with the LSTM and GRU neurons have been made.
Comparative Study of Pontryagin Maximum Principle and Direct Method in Aircraft Optimal Control Design
Authors: Korsun O N , Stulovskii A V , Gulevich S P
Published: January 2020

This paper deals with the problem of open-loop control design for a dynamic object which is described by a nonlinear system of differential equations. To solve this problem a direct method is used, in which the target functional is minimized by population-based algorithm. The method is applied to a test problem which consists of finding optimal control for spacial motion of maneuverable aircraft. Proposed technique is compared with two classical solutions to considered problem. One of them is based on equating to zero the partial control derivatives of the Hamilton function, wherease the other on the Hamilton function maximum over controls (Pontryagin maximum principle). The paper confirms high degree of similarity between solutions obtained by all considered methods of selecting target functional. However, classical algotithms show slightly worse accuracy and higher sensitivity to the quality of initial approximation. In addition, proposed direct method permits to evade the necessity to solve a two–point boundary value problem required in classical algorithms.
Comparison of Economic and Transport Capabilities of Heavy C-type Airfield-Based WIG [Wing-in-Ground-Effect] Craft Versus Passenger Aircraft
Authors: Luchkov A N
Published: January 2020

This article assesses the potential increase in the transport and economic characteristics of heavy cargo and passenger aircraft, if they are processed into WIG craft. This type of air transport is of interest from the point of view of improvement of characteristics from the position of mass use on the airways that pass mainly over the water surface of seas and oceans, as 75% of international air transport is accounted for by these airways. Classic amphibious WIG crafts are known to have extremely low performance due to their high aerodynamic resistance, high structural weight and increased fuel consumption in take-off/landing modes. The solution to this problem may be to switch to airfield take-off WIG crafts. As part of the work, boundary conditions for the study were developed, and a set of formulas was developed to allow for a recalculation of fuel and payload redistribution depending on the operating conditions. The results include changes in gross weight, transport and fuel efficiency, as well as potential changes in aircraft operating costs.
Model-Based Optimization in Induction Heating of Thin-Wall Shells
Authors: Rogachev N G , Rogachev G N
Published: January 2020

A mathematical model of induction heating process of paramagnetic thin-wall shells was considered. Electromagnetic processes in the system “inductor heated shell-temperature equalization devices” are modelled by the method of coupled circuits, thermal processes — by the differential-difference method. The model is implemented in MATLAB and is used to optimize the heating process based on partial criteria that are formulated in fuzzy form.
Optimal model of locating charging stations with massive urban trajectories
Authors: Huang Danhui , Chen Yuan , Pan Xiaochen
Published: January 2020

Popularization of electric vehicles (EVs) is a promising approach towards realizing environmentally friendly transportation. While government has implemented advantageous policy efforts to boost EVs, how to effectively build electric charging stations becomes a key link. A reasonable distribution should not only conform to user habits and potential behaviour patterns, but also satisfying the charging reliability. In this paper, vehicle track data and POI data are used to cluster with road network information. A clustering algorithm based on R serving radius is proposed to improve the results and make them accommodate the rationality of the real world. Finally, suggestions are made for each charging station power supply scale according to regional difference. Experiments show that the proposed model has practical guiding significance.
Numerical simulation of ultrasonic testing reliability of civil aircraft considering the influence of the angle between the sound beam axis and the crack orientation
Authors: Tian Pei Qiang , Feng Yun Wen , Zhan Shao Zheng , Zhang XueLiang , Xue XiaoFeng
Published: January 2020

In order to quantify the influence of the angle between the axis of the sound beam and the crack orientation on the detection reliability during the ultrasonic testing, this paper uses COMSOL Multiphysics to simulate the numerical simulation of ultrasonic testing and explores the variation of the ultrasonic detection amplitude with the angle. The function of fitting the function is given, and then the numerical simulation method of ultrasonic detection reliability considering the influence of the angle between the beam axis and the crack orientation is proposed. According to the numerical simulation case of ultrasonic detection reliability, the following conclusions are obtained. When the detecting device detects a crack of less than 2.23 mm and the detection probability is greater than 90%, the angle between the axis of the sound beam emitted by the detecting device and the direction of the crack must be greater than 70°; If the detecting device detects a crack greater than 0.7 mm and the angle is greater than 86°, the probability of detecting the crack is greater than 61.35%.
Research on UAV flight safety interval under wind influence
Authors: Wang Zekun , Wen Xiangxi , Wu Mingong , Qiu Shidai , Li Ang
Published: January 2020

With the progress of aerospace technology, unmanned aerial vehicles (UAV) are gradually showing incomparable advantages over manned aircraft. However, the safety interval of formation flying has always puzzled us. In order to solve this problem, this paper mainly studies the collision risks of three UAVs in flight considering the two factors of wind and positioning error. It provides a reference for the research on the of flight safety interval UAV formation.
Analysis on regional difference of meteorological S&T innovation capability in China
Authors: Shen Danna , Li Yan
Published: January 2020

This paper selects the relevant meteorological data in 2014-2017 of the seven regions of Chinese mainland divided in accordance with the administrative area to construct the index system of meteorological S&T innovation capability, and then by means of Entropy TOPSIS method to get the values of Ci of the seven regions, and finally calculates the coefficient of variation of those Ci values based on the analysis of the meteorological S&T innovation capability, the innovation environment, the innovation input and output to analyze the developmental differences across regions. The results of this research prove that from 2014 to 2017, the meteorological S&T innovation ability of South China, North China and East China was relatively strong, while that of other regions was relatively weak. Besides, the meteorological S&T innovation ability of each region fluctuated in different years, but by 2017, the differences in innovation ability of meteorological S&T among regions were narrowing.
Experimental investigation of cutting temperature during drilling of float glass specimen
Authors: Sharma Ankit , Jain Vivek
Published: January 2020

In today’s industrialization, hard and brittle material such as float glass are widely used in various applications such as micro-fluidic devices, bio-medical parts, automotive glass, and optical lenses. Due to its difficult-to-machine characteristic, drilling of float glass leads to defects related to drilled hole quality. These defects exemplify as chipping, crack and surface roughness. All these defects are directly depend upon the temperature which could affect the drilling quality. Hence, authors tried to investigate the influence of cutting temperature of float glass specimen using rotary ultrasonic drilling. The experimentation is performed at two conditions with constant value of ultrasonic amplitude (20 μm), feed rate (6 mm/min) and spindle rotation speed (5000 rpm). These conditions are without coolant and with-coolant drilling. It is noticed that maximum cutting temperature reached with coolant drilling is 50.56°c and without coolant is 62.11°c. Consequently, it is revealed that drilling with coolant (water) should be adopted to improve the hole quality. Since, it reduced the formation of stresses during drilling operation which are induced due to rise in temperature. Microstructure images are carried out to visualize the hole quality.
Dual stage control of a servo system consisting of a piezoelectric actuator and a linear motor for electrical discharge machining
Authors: Melhem Muyad Bani , Simic Milan , Feng Yong , Ding Songlin
Published: January 2020

Gap width is the most important factor that affects the stability of the electrical discharge machining (EDM) process, material removal rate and surface finish of the workpiece. This research is to develop a new hybrid positioning system which consists of a linear servo motor and a piezoelectric actuator (PZT) for high efficiency EDM processes. In this new system, the servo motor provides the macro feeding for the workpiece while the PZT feeds the workpiece in micro scale at high frequency. To reduce the delay caused by separate movements of the linear motor and PZT, a new control algorithm was developed to synchronize the movements of both the motor and PZT. Cutting experiment shows that an increase in MRR of 1.5 times was achieved by using the proposed algorithm.
Complete coverage of perovskite materials over ZnO Nanorods with Multiwalled Carbon Nanotubes (MWCNTs) as Hole Transport Material (HTM)
Authors: Bramantyo Albertus , Poespawati Nji Raden , Udhiarto Arief , Murakami Kenji , Okuya Masayuki
Published: January 2020

In this research, ZnO nanorods (NRs) have been fabricated for perovskite solar cell (PSC) application. An issue about the use of ZnO material for PSC application is lower photovoltaic outputs than TiO2 material. Such outcome is due to unstable ZnO/perovskite interface. Other factor is due to partial coverage of the perovskite over the ZnO material. By using 1-step method and mixture of DMF and DMSO as the solvent for perovskite solution, complete coverage of the ZnO NR was achieved. Multiwalled carbon nanotubes (MWCNTs) and copper iodide (CuI) were used as hole transport materials (HTMs) for comparison purpose. The experiment and characterization were done in Shizuoka University, Hamamatsu campus, Japan. The ZnO NRs were grown by implementing 2-steps method of seed layer deposition by spin coating and NRs growth through chemical bath deposition. Methylammonium lead iodide (CH3NH3PbI3 or MAPbI3) perovskite was grown through 1-step method by mixing equimolar lead iodide (PbI2) and methylammonium iodide (CH3NH3I or MAI) in DMF and DMSO solvents (volume ratio of 7 to 1 for DMF and DMSO, respectively). The current-voltage (I-V) curve for both materials showed higher JSC and VOC for MWCNTs at 5.34 mA/cm2 and 0.21 V, respectively compared to CuI materials (JSC = 3.40 mA/cm2 and VOC = 0.14 V). Lower VOC is the result of higher series resistance due to non-passivated ZnO/MAPbI3 interface. Another factor to consider is recombination of electron and hole at the interface. MWCNT material is an alternative material to act as HTM because of high conductivity and lower electrical resistance compared to CuI. Complete coverage of the perovskite over ZnO material helped improving the production of photogenerated electrons.
Heart rate prediction model based on neural network
Authors: Luo Minmin , Wu Kaibin
Published: January 2020

Heart is an essential organ of human body and heart rate (HR) is the most obvious heart activity in daily life. In order to predict heart rate, a heart rate prediction model based on LSTM (Long Short-Term Memory) neural network is proposed in this paper. This model combines five physiological parameters as input to ensure the validity of heart rate prediction. The results show that Adam-LSTM is a good method for heart rate prediction and reflects the tendency of heart rate change in daily life. At the same time, the experimental results show that the root mean square error of prediction value is small and the validity is high.
Study on the performance of inflatable decelerator under hypersonic aerodynamic load
Authors: Wang Jingjing , Yu Li , Yang Xue , Zhao Xiaoshun
Published: January 2020

In order to understand the influence of hypersonic aerodynamic force and aerodynamic heat on the performance of flexible structure of inflatable decelerator, a unidirectional thermal-fluid-structure three field coupling model under the extreme conditions of reentry trajectory is established in this paper. The temperature distribution of thermal protection structure (TPS) and structure response are obtained. The numerical results show that the TPS has a good insulation effect, and the cooling contribution of insulation layer in TPS is up to 80.90%. The stress is concentrated at the contact position between the flexible structure and the blunt head. The stress of TPS layer fluctuates greatly.
Ideal performance analysis of the scramjet with Pre-jet fuel
Authors: Zhang Shengsheng , Xue Yu , Yang Yang , Wang Haoliang , He Yubao , Zheng Sihang , Lv Ya , Zhang Yong
Published: January 2020

In order to research the influence on the overall performance of scramjet with Pre-jet (jetting fuel or water vapor into the isolator) fuel, the governing equations of the different component in scramjet and the ideal performance analysis model with Pre-jet fuel are established. Moreover, Pre-jet fuel is considered based on the ideal Brayton cycle. The results of ideal performance analysis show that Pre-jet fuel doesn’t burn at a given maximum temperature of the combustor exit. Due to the increasing of oil to air ratio with Pre-jet fuel, the outlet temperature of the isolator drops more. However, fuel potential of the combustion, the flux of working fluid and the engine thrust ratio are increased. Meanwhile, the influence of methane and water vapor on the engine performance is similar, because the Pre-jet fuel is small and there are some similarities between methane and water vapor.
Cross-modal retrieval by an end to end way
Authors: Yin Bang Hu , Li Xiu
Published: January 2020

Cross-modal retrieval has attracted most attention in the recent years. For the image and text, how to measure the semantic similarity among them is still a challenging problem in cross-modal retrieval task. In our paper, we propose a cross-modal retrieval method that uses a CNN to obtain the semantic similarity between image and text. Most methods to solve this problem employ two separate parts for each modality to obtain the semantic similarity between them. However, in our work we just use a CNN to get the semantic similarity without having to use separate networks. In addition, we are aiming to solve the problem between long text and image, so we use the topic model to process the text. We evaluate our approach on Wikepedia dataset.
FFOCT imaging based on compressed sensing
Authors: Mu Ning , Liu Feng , Guo Hongxia , Gao Wanrong
Published: January 2020

With the demand for high-resolution images, the storage space occupied by the images of the full-field optical coherence tomography (FFOCT) system is becoming more and more intensified. How to reduce the data volume of high-resolution image systems has become a research hotspot in the image processing industry. In particular, precision medicine requires high-resolution images of organs and tissues, and this data storage system requires a large storage space. For this reason, based on the high-resolution tomographic image obtained from our organ tissue, compressed sensing theory is used to perform compression reconstruction simulation. It is verified that the amount of data stored in the three-dimensional image of the diseased tissue is effectively reduced without changing the image resolution.
A new automated drip irrigation and fertigation system for sugarcane crops
Authors: Rivera Diana Rose , Paduman Sharaful-Ilmi , Uon Leapheng , Chua Alvin
Published: January 2020

This paper presents a new automation system specifically design for sugarcane crops to optimize the irrigation and fertigation process against resource shortage and climate change. The system uses a programmable logic controller, sensors, actuators, and other mechanical equipment to control and manage the supply of water and nutrients based on the fertilizer requirement at sugarcane’s development stages. The simulation was done using a commercially available tool Picosoft V6.22, a software compatible with Allen Bradley Programmable Logic Controller. The economic analysis was also provided to show the advantages of using an automated irrigation as compared to the manual irrigation. Result of the analysis shows a payback period of a month as compared to 4.3 months for the manual irrigation system.
Analysis and design of integrated intrusion detector performance testing system
Authors: Sun Fei , Wang Xiaofeng , Tan Ming , Hu Xianfeng , Hu Rui
Published: January 2020

The integrated intrusion detector performance testing system is mainly used to simulate the performance of active infrared, passive infrared, infrared and microwave composite detectors. The device has the advantages of complete function, simple operation, stable performance, high control precision, accurate collection and good security. In addition, the wireless transmission technology is adopted, and the remote operation can be carried out. The main goal of this paper is to develop the intrusion detector detection system according to the standard technical requirements and test methods, to meet the needs of product detection, and finally to improve the competitiveness of domestic related enterprises in the international market. The device can test whether the intrusion detector has the problem of false alarm and false alarm, test the anti-interference ability and the performance parameters of the intrusion detector, and then improve the product quality of the intrusion detector. It is very helpful to develop new products.
Short text semantic feature extension and classification based on LDA
Authors: Xu Liu-tong , Xue Zhao , Huang Hai
Published: January 2020

To solve the problem of feature sparseness of short texts, we studied the application of LDA Topic Model on feature extension and classification of short texts. Training LDA on external long texts related to short texts, and achieving the inference and extension of short texts’ topics based on LDA solves the feature sparseness of short texts and improves the accuracy of classification effectively. Latent semantic information in LDA can also effectively improve the interpretability of short texts.
Crude Castor Oil as Blend Component in Diesel/Ethanol Fuel Blend: Combustion Characteristics and Exhaust Emissions
Authors: Klinkaew Niti , Sukjit Ekarong , Dolwichai Teetut
Published: January 2020

Some properties such as poor lubricity and low viscosity limit the use of ethanol as an alternative fuel in diesel engines. To improve such inferior properties, crude castor oil with excellent lubricity and extremely high viscosity was added to diesel-ethanol fuel blend. Investigation on combustion characteristics, engine performance and exhaust emissions of a four-stroke single cylinder diesel engine fueled with ternary blend of diesel-ethanol-castor oil was carried out in this research. The blend of 80% diesel, 10% ethanol and 10% castor oil (D80E10C10) was selected for the study. The results on fuel properties showed that the presence of 10% castor oil in diesel-ethanol blend can improve the properties of the blend and meet the diesel fuel specification. The delay in start of combustion was obtained with the use of the ternary blend with respect to diesel fuel combustion, resulting in the lower peak of in-cylinder pressure and temperature. The reduction in nitrogen oxides (NOx) and smoke was found when the engine was operated with the ternary blend at all conditions tested. Carbonaceous gas emissions, carbon monoxide (CO) and unburnt hydrocarbons (HC), was increased with the combustion of ternary blend at low engine operating loads. However, the difference in CO and HC with the combustion of diesel fuel and ternary blend was decreased as the engine loads increased. The addition of crude castor oil to diesel-ethanol blend used as alternative fuel in the diesel engine did not show the significant difference in brake specific fuel consumption and brake thermal efficiency compared to diesel fuel.