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Volume 6 Issue 4 (April 2019)

S.No. Title & Authors Page No View
1

Title : Accurate And Efficient Power Generation of Photovoltaic Systems Using Wireless Technology

Authors : Anand M. Sharan, Mohammad Zamanlou

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Abstract :

In this work, automation and efficient power generation of a solar park are studied to overcome high inefficiencies that exist in most of the present parks. The inefficiencies arise from many reasons such as stationary condition of the photovoltaic panels to name one. The other problems arise because such parks extend over large areas and maintenance of efficient power generation becomes difficult if all of the panels are mounted such that they track the Sun for maximum power generation. In this work, the entire plant is operated from a single control room and all the tracking machines are commanded to follow the Sun from the control room through wireless signals. The entire motion of the panels is controlled from this room using Arduino Mega microcontroller. In addition, to enhance the accuracy and reliability, several additional measures have been incorporated so that through an accurate feedback system or fault detection mechanism has been provided for in this work. 

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2

Title : One approach in the time domain in detecting copy-move of speech recordings with the similar magnitude

Authors : Nguyen Tuan Anh, Han Thi Thuy Hang, Guang Chen

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In this study, we focused on copy-move detection in the content of audio files. We have many ways to identify a forged audio, in this article we focus on comparing the pitch of samples, compare the similarity of sound intensity in the time domain together. The goal of this method is to focus detecting copy-move speech in an audio file, which it has archived high speed processing and improved accuracy.

11-13
3

Title : Analysis Of Concrete By Partial Replacement Of Coarse Aggregate With Crumb Rubber

Authors : Y.Suma, Challa.Nithin kumar Reddy

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The principle point of the investigation is to distinguish the utilization of reused material in the concrete as it upgrades the mechanical properties of cement. As "Crumb Rubber" is likewise one of the strong waste which can be utilized as a part of cement by somewhat supplanting fine aggregate. In this investigation "Crumb Rubber" was supplanted by volume of coarse total as 0% to 20% volume of "Crumb Rubber" supplanted coarse aggregates at an interval of 5% increase. Numerous tests were done for fresh concrete (i.e. Slump test, Flow test, Compaction factor etc.) and for hard concrete (i.e. Compressive strength). The elastic properties are also determined from concrete cubes. 3 cubes for each percentage of replacement are casted and tested after 28th days of curing. This attempt of replacing the coarse aggregates with rubber aggregates will save the natural aggregates, reduces weight of structure and also helps achieve sustainability.

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4

Title : Effect of Heating Temperature on Compression Strength of Beech Wood

Authors : Arian Kapidani, Dritan Ajdinaj (Hajdini), Besnik Habipi

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A study was carried out to evaluate the effects of heating treatment on compression strength parallel to grain of beech (Fagus sylvatica L.) wood of Albanian origin. The heat treatment was conducted at temperatures 180, 200 and 220°C for 2 hours, at atmospheric pressure. Samples were produced from logs sapwood of origin from central Albania. Before treatment the oven dried density was calculated. The weight loss after treatment resulted from the lowest to the highest temperature respectively 4.34, 6.87 and 10.12%. Regarding to compression strength parallel to grain it was noted a positive approach to heating treatment at atmospheric pressure. The compression strength increased up to 12% for treatment at 180°C. For higher temperatures the strength started to decrease, but in all cases was above compression strength of non treated wood. It seems that thermal treated Albanian beech wood presents a suitable choice for indoor and outdoor utilisation for desks and chairs.

17-20
5

Title : Industrial Membrane Processes for the Removal of VOCs from Water and Wastewater

Authors : Hisham A. Maddah

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This paper illustrates the role of different membrane technologies in the treatment of VOCs from water and wastewaters. Emerging membrane technologies such as pervaporation (PV) and membrane distillation (MD) gained scientists’ attention as a promising way for water treatment. We have studied and discussed today’s advanced membranes: PV membranes which included polysiloxaneimide (PSI) and polydimethylsiloxane (PDMS), and MD membranes which included electro-spun nanofiber membrane and vacuum membrane distillation (VMD). Studied membranes showed great potential for the treatment of VOCs from water. However, it was found that certain factors like feed temperature, downstream pressure, component volatility (Henry's constant) and VOCs concentration must be considered in the design phase to achieve the ideal treatment.

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6

Title : Numerical Simulation of Deck Waves of Container Vessel Based on Numerical Viscous Wave Tank

Authors : Yi Liu , Renqing Zhu, Lefei Li, Yu Zhang, Miao Xia

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Abstract :

When a vessel is sailing in rough wave, the large relative movement between the structure and the waves will cause the waves to flood the deck. Deck waves will cause damage to the deck equipment and destroy the integrity of the structure. This condition will not only lead to the loss of economic property, but will also cause serious casualty. The waves on the deck will cause a huge slamming load on the vessel, causing the structure of the bow deck to be damaged by the impact of the water and even causing the entire hull to sink. Therefore, it is very important to analysis the deck wave and study the wave law on the bow deck and structure on the upper deck. When we design civilian or military ships, deck wave is an important factor to structure of vessel, personnel safety and ship performance. In the paper, the container ship is modelled by CAD software and the mesh of wave tank is generated by HEXPRESS function, which is based on Fine/Marine’s adaptive mesh generation technology. In addition to this, numerical model simulates the motion response of the container ship under different wave amplitude and vary ship’s speed in regular wave. Moreover, the variation law of the wave phenomenon on the deck is analysed. Through this research, it is found that the waves on the deck will have a severe impact on the vessel's deck and the equipment on the upper deck. The well-designed wave-stopping structure can effectively reduce the impact of the water body on the structure.

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7

Title : Formulation of a juice cocktail based on pineapple, mango and carrots and studies of physicochemical, biochemical and microbiological parameters

Authors : Laurette Mulumba K., Didier Ngombwa, Junias Kabele, Et Jean-Noel Mputu

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Abstract :

We used seven different formulations for the juice cocktail made from pineapple, mango and carrot. The pH varies from 4.4 to 4.5; titratable acidities range from 0.17 to 0.42; the ash rate varies from 0.19 to 0.38. We observe a low value of fat about 0.09% ± 0.05. Total sugars range from 6.10 to 28.1 °Brix; Vitamins C are present in all our formulations at concentrations ranging from 17.7 to 31.5 but also the presence of vitamins A, B2, D and E. Calcium and magnesium are present with respective concentrations of 7.22 and 3.90 mg / 100 ml. Brass and manganese are also present at 0.58 and 0.12 mg / mL respectively. The protein content varies from 0.33 to 1.03% and the glucose content varies from 10.03 to 16.90%. Note also the presence of fructose in our formulations. Regarding the microbiological parameters, we obtained results meeting the limits set by the ISO 4833 standard which governs the microbiology of the food chain.

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8

Title : Impact of Renewable Distributed Generation on Protection Coordination of Distribution System

Authors : Mahesh Dahal, Ajay Kumar Jha, Rudra Mani Ghimire

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This paper presents a study on protection coordination of protective devices in a radial distribution system by considering penetration of distributed generation. This paper presents the study of protection coordination among various protective devices without and with penetration of DGs in distribution network. The proposed approach is tested on modified IEEE 13 Bus radial distribution system.  When fault occurs in the system, level of fault current changes which in turn changes the operating time of various overcurrent relays. Therefore, it is essential to calculate and recommend method of the relay setting so as to minimize the operating time of relays and also to avoid its mal-operation. In this paper, the protection scheme is optimally developed by taking into consideration the above mentioned circumstances. The operating time of relays can be reduced and, simultaneously, coordination can be maintained by considering the optimum values of time dial setting (TDS). The proposed method used the Genetic Algorithm (GA) for determining the optimum values of TDS of overcurrent relays and hence operating time of circuit breaker CB.

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9

Title : Analysis Of The Influence Of Temperature Field On Hulll Local Strength

Authors : Zhenxiao Shi, Yifeng Guan

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Because the asphalt is kept at 180 C during transportation, the asphalt temperature has an effect on the structural stress of the ship hull. This paper mainly discusses the effect of temperature on the local structural strength of the asphalt ship. Taking an asphalt ship as an example, the whole cargo tank area is modeled by using finite element software MSC. Patran and MSC. Nastran. The model is established by referring to the relevant provisions in the Code for Construction of Steel Inland River Ships. The finite element mesh of the model is generated by choosing the appropriate element type. Applying temperature boundary conditions, the calculated temperature field is applied to the model in the form of load, and other boundary conditions are applied to establish a variety of working conditions, calculate the structural strength, and obtain the stress distribution of the hull. Considering the thermal stress with or without temperature, the effect of temperature on hull structure is analyzed.

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10

Title : Thermal aging of polyaniline/grafite nanolayers nanocomposites

Authors : Laura Córdova Matte, Cássio Stein Moura, Raiane Valenti Gonçalves, Nara Regina de Souza Basso

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In this work we investigate the behavior of the electrical conductivity of polyaniline when small amounts of graphite nanolayers are added to the polymeric matrix and subsequently suffer an aging process. We observed that graphite tends to increase conductivity whilst aging tends to decrease it. On the other hand, absorption of atmospheric humidity tends to increase conductivity. We show that a mathematical model describes with good agreement the dependence of the conductivity with the aging time.

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11

Title : Research on Design Drawing Change Management under Modern Shipbuilding Mode

Authors : Tao Wang, Xiaoping Ma

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In the process of ship design and construction, the change management of design drawings is a difficult point in project design management. Through the analysis of the management status of ship enterprise documents and design drawings, the paper expounds the shortage of ship filing drawings change management at present, and puts forward the system management method of ship design document archiving storage and change transfer in order to ensure the effectiveness, accuracy and timeliness, it provides a useful reference for shipbuilding enterprises to improve the management level of production design.

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12

Title : Numerical investigations on vibration characteristics of sandwich plate

Authors : Lu Shi, Yining Mao, Ying Chen

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This paper focuses on vibration characteristics of sandwich plate. The validity of the proposed method is verified by comparing the numerical results of the supported beam at both ends with the theoretical model. The numerical simulation of sandwich plate subjected to harmonic excitations was investigated by using finite element software ANSYS. The effects of different plate thickness, core thickness and core elastic modulus on the vibration characteristics of the sandwich were discussed by comparing the numerical results. The natural frequency and amplitude-frequency response curves of the structures under different parameters were obtained. The dynamic characteristics of sandwich plates, stiffened plates and steel sheets under similar weight conditions were analyzed. The results can guide design of warship structures.

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13

Title : Hull tag welding based on offline programming

Authors : Yanmiao Shao, Anqing Zhu

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In view of the current inaccurate positioning of the hull tag word and the unstable welding result, this paper proposes to weld the tag word by applying the robot offline programming method. Firstly, by analyzing the hull tag and classifying the tag words, the welding task objects are identified through the welding scene analysis. The welding of the tag words is completed by off-line programming. The welding results show that the welding quality and efficiency are improved; the marking coordinates are accurately positioned; and the working environment is improved.

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14

Title : Research on Schedule Management of Shipyard Based on Task Package

Authors : Ke Gao, Xiaoping Ma

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To solve the problem of how to effectively manage the progress of the ship during the ship construction process. Based on the task package, this paper analyzes and studies the shipyard operation schedule management method, and focuses on the schedule planning process and schedule management method based on the task package construction process to achieve the full process management of the ship's operation progress. Finally, effective control over the deviation of the ship construction schedule will be realized to ensure delivery on time.

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15

Title : Experimental and Simulation study on discharge characteristics of low-pressure dual-frequency capacitively coupled Ar/O2 Plasma with High and low Frequency Power

Authors : Liang-Chao Wu, Gui-Qin Yin

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The argon and oxygen mixed gases plasma were produced by using dual-frequency  capacitively coupled plasma((DF-CCP). The high frequency (HF) was 94.92 MHz and the radio frequency (LF) was 13.56 MHz. In experiments, the mixed Ar/O2  plasma with different discharged power of HF and RF were analyzed by optical emission spectroscopy (OES). The excited particle species were analyzed by optical emission spectroscopy, and the electron temperature was calculated by using the double line intensity ratio method. In simulation, the electron density, the potential and electric field distribution were obtained by a one-dimensional particle-in-cell with Monte Carlo collisions (PIC-MCC) method according to the experimental conditions. These results showed that under low pressure conditions (50 mTorr), the electron density increased with the HF power increase and decreased with the LF power increase. The electron temperature decreased with the HF power increase and increased with the LF power increase. As the LF power increases, the thickness of the sheath was widened, which would led the plasma discharge area to be reduced, electron density decreased, and electron temperature increased. The HF power had no big effect on thickness of the sheath. The numerical results were well agreed with the experimental phenomenon.

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16

Title : Comparative Assessment of Terrestrial Laser Scanner Against Traditional Surveying Methods

Authors : Ahmed M. Abd-Elmaaboud, Mohamed E. El-Tokhey, Ahmed E. Ragheb, Yasser M. Mogahed

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Terrestrial laser scanner has become a familiar instrument and most used technology for rapidly capturing very accurate and highly detailed 3D point cloud datasets for a variety of applications in Engineering. The advantage of laser scanning is that it can record huge numbers of points in a relatively short period of time. The main idea here is to assess the accuracy of terrestrial laser scanner and compare it relative to the other traditional surveying instruments. This was done throughout four different approaches. First, a grid levelling for a 30,000m2 ground terrain was performed using Total Station (TS), and Terrestrial Laser Scanner (TLS). After which, the RMSE for TLS was computed. Secondly, a control point network consisting of nine points was measured using TS, TLS, and real time kinematic global positioning system (RTK-GPS) and the precision for each instrument was calculated depending on the standard deviation (SD). In addition, the accuracy of TLS and RTK-GPS was calculated depending on the RMSE.  Thirdly, the effect of vertical angle on TLS measurements was assessed by measuring fifty-six points fixed on a building façade using different vertical angles. Those points were measured using both TS and TLS, then the absolute height differences between TS and TLS measurements were calculated to figure out the effect of increasing the vertical angle on measurements. Finally, the accuracy of TLS on vertical cut measurements was calculated by surveying a downhill area of 500m2 by both TS and TLS and the RMSE for TLS measurements was calculated. From the research results, it was found that the RMSE for TLS in measuring terrains was about 15cm. In measuring control point networks, TLS was figured out a higher accuracy than RTK-GPS. TLS vertical angle is not preferable to be more than 45 degrees. In vertical cut measurements TLS was figured out a RMSE of 6mm and a lower measurement period. Eventually, despite the fact that TLS is more expensive than traditional surveying techniques, it is more beneficial in terms of time and effort saving. In addition, it can figure out acceptable accuracy ranges with more detailed surveyed data.

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17

Title : Application Of ECC And ECDSA For Image With Error Control Technique Using RS Code

Authors : G Shruthi Sastry, Dr. Smitha Sasi

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The best approach to verify conveyed multimedia applications is to scramble multimedia data utilizing public key cryptography calculations. Elliptic curve method of cryptography is a strategy that implies ensuring private data against unapproved access in that circumstance where it is hard to give physical security. The paper proposes an answer for keep up authentication of the ECC encrypted image transmission by including ECDSA that is utilized to deal with the confirmation of key exchange with the trusted entities. Reed-Solomon(RS)  codes are utilized to perform Error Correction for the errors that occur upon the data. RS codes are usually utilized in the digital communication because of their solid abilities to wipe out both random as well as burst errors. FEC encoders present redundancy in data before it is transmitted. The repetitive data  are transmitted alongside the original data through the channel. A RS decoder at the end is utilized to recuperate any undermined data.

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18

Title : Design and Analysis of Microinverter Based Solar Grid Tied Photovoltaic System

Authors : Er. Sandesh Kunwar, Dr. Prof. Laxman Poudel

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This study intends to design and perform financial analysis of the solar photovoltaic (PV) microinverter for grid connected system. A micro-inverter is the portable inverter used in photovoltaics, that inverts direct current (DC) produced by a solar module to alternating current (AC). Microinverter with low frequency transformer configuration design is considered for the research. For grid connected system, microinverter needs to synchronize voltage and frequency while injecting active power to the grid, so Phase Locked Loop (PLL) has been used in microinverter control algorithm. The coordinated design of LCL filter circuit and current control algorithm is used to limit the harmonic of the system within the 5 percent and regulated the output voltage and frequency within the grid limit. About 12 PV module with capacity of 2.8 kW microinverter system and equivalent string inverter PV system is simulated in MATLAB. In the computer-based simulation, when 2 or more PV modules are shaded in the string configuration, there is drastically decrease of DC voltage causing system  to collapse unlike microinverter system where the performance of shaded microinverter doesn’t impact the output voltage of others.

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Title : Fresh properties of self-consolidating concrete using SCM

Authors : Kiran. B, Dr. Nagaraja. P. S

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This paper presents the key properties of freshly mixed self-consolidating concrete (SCC) incorporating rice husk ash (RHA). Air-entrained SCC mixtures were produced based on the water/binder (W/B) ratios of 0.30–0.40. RHA was used substituting 0–30% of cement by weight. The fresh properties investigated were filling ability, passing ability, segregation resistance, air content, and unit weight. The effects of RHA and W/B ratio on these properties were observed. Test results revealed that the fresh properties were significantly influenced by the W/B ratio and RHA content of concrete. RHA also affected air entrain- ment and decreased the unit weight of concrete.

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Title : Research on subassembly Flow-Line of curved panel based on Simulation Technology

Authors : Li Ming-Ming, Wang Yue, Li Cui-Cui

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With the rapid development of industrial informationization, the technological revolution represented by intelligent manufacturing is gradually subverting the traditional labor-intensive shipbuilding industry. It not only brings lower labor costs, higher product quality, but also greatly reduce the periods of shipbuilding. The era that shipbuilding enterprise’s competitiveness is largely depend on labor costs will never go back. Compare with the rapid development of foreign shipbuilding in intelligent shipbuilding, the upgrade of Chinese shipbuilding enterprises is obviously lagging behind, among them, the manufacture of ship curved block is the most outstanding, it still stays in the manual operation stage that relies on a large amount of manual operation. Therefore, the reformation of the curved block workshop is of great significance to Chinese shipbuilding enterprises. This paper use the subassembly Flow-Line of curved panel as a breakthrough to upgrade the curved block production, and by means of simulation technology, verifies the rationality and feasibility of the curved block assembly shop after transformation.

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Title : Impact of Penetration of Photovoltaic on Rotor Angle Stability of Power System

Authors : Jitendra Thapa, Dr. Sanjeev Maharjan

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The small signal and transient behaviour of large multi-machine system is minimal when the small- scale PV farm power is connected to it. But the oscillation on dynamics or states of the multi-machine system begins to increase as the large-scale PV farm power is connected. In this work investigations are carried out on small signal stability and transient of large multi-machine system with PV connected to it. Eigenvalue analysis is carried out for both cases with and without the PVs and are compared. Transient stability is analysed by time domain simulation by executing three phase short circuit fault at critical location. When PV are integrated without the replacement of conventional generators, small signal stability and transient stability both improves. Eigenvalue analysis shows that the damping of critical modes increases. And the magnitude of the peak of rotor angle of generator 2 decreases from 17.984o to 13.069o due to addition of PV which shows improvement in transient stability. In contrast, the stability of system in terms of small signal and large signal both degrades as the addition of PV is done by the replacement of the conventional generators. The trend of critical mode 3 towards the RHP (right half plane) of the complex plane indicates that the small signal stability is degrading. For the same case, the peak of the speed of generator 1 increases form 1.015 p.u to 1.0311 p.u from no PV to various level of PV which indicates the degradation of transient stable. The reduction in inertia due to replacement of synchronous generators reduces the damping of the critical modes which is also verified by the transient analysis.

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22

Title : The effect of nitrogen ratio on the dual-frequency capacitively coupled Ar plasma

Authors : Xiang-guo Meng, Qiang-hua Yuan

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Dual RF capacitively coupled argon-nitrogen hybrid plasma is obtained by plasma enhanced chemical meteorological deposition(PECVD) equipment. The frequency of the high frequency RF source is adjustable in the range of 0 to 100 MHz, while the frequency of the low frequency RF source is fixed at 13.56 MHz. In the experiment, the frequency of HF RF source is set to 94.92 MHz. The characteristics of argon-nitrogen mixed plasma are analyzed by emission spectroscopy(OES). The electron temperature were calculated by Fermi Dirac model and the electron density were calculated by absolute measurement of continuous spectrum with different ratio nitrogen respectively. The electron temperature of argon-nitrogen mixed plasma increases with the increase of low-frequency power, The electron temperature decreases with the increase of high frequency power, The electron temperature decreases with  gas pressure increasing. When other conditions remain unchanged (power, high frequency, low frequency power, air pressure), the electron temperature increases with the increase of nitrogen content. The electron density increases with the power increase and increases with the gas pressure increase. With the increase of nitrogen content, the electron density decreases gradually.

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23

Title : A Model for Service Quality and Customer Loyalty in Banking Industry of Bangladesh

Authors : Md. Hafizur Rahman, Md. Rakibul Islam, Farhana Mitu, Mohitul Ameen Ahmed Mustafi

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Customers of the banks in Bangladesh are highly service sensitive. Thus, the quality of the services provided by the banks to its customers is the key to success. There is also a relationship between service quality and the customer loyalty in banks. Therefore, this study aims at determining the influence of service quality factors such as, assurance, empathy, reliability, responsiveness, and tangibility on customer loyalty in banking sector in Bangladesh. By using structured questionnaire, this study was conducted on 529 customers of 15 private commercial banks of Bangladesh. Convenient sampling method was used for collecting the data for this study. A multivariate analysis technique like Structural Equation Modeling (SEM) was used for analysing the relationships among service quality dimensions, and customer loyalty. Results show that the service quality factors like assurance and reliability positively affect on customer satisfaction in banking sector of Bangladesh. Results also show that the customer satisfaction is also positively related to customer loyalty in the bank. It is suggested that the policymakers of the banking industry of Bangladesh should give importance on service quality factors like assurance, reliability, specially empathy, responsiveness and tangibility for increasing the customer loyalty in their banks.

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