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Volume 6 Issue 2 (February 2019)

S.No. Title & Authors Page No View
1

Title : The Treatment of Effluent from Food Industry Using Anaerobic-Aerobic Process with MBR system

Authors : AL-Saadi Anmar Joudah, Gabriel Racoviteanu

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Abstract :

Wastewater treatment of the food industry by using a combination of the anaerobic-aerobic process as a pre-treatment and the bioreactor treatment represented by MBR system has been proven as an efficient single step process to treat industrial wastewater and produced an excellent effluents quality suitable for reuse. In this study, three phases of anaerobic biodegradation were used as the first step of biological pre-treatment, with the time of fermentation 5, 10 and 15 days respectively. At each phase, the aerobic biodegradation process was performed to activate sludge at periods of 2, 4, 8, and 24 hours, respectively, with the MBR system using hollow fibre membrane type ZW-10 that's operating under a low-vacuum. NaOCl solution has been adding in the bioreactor tank during the backwashing process.  Twenty-eight of samples were collected from the influents and the effluents during the biological and bioreactor treatments. The samples were tested for eight water quality tests: temperature, Dissolved Oxygen (DO), pH, Turbidity, Total Suspended Solids (TSS), Mixed Liquor Suspended Solids (MLSS), Chemical Oxygen Demand (COD), and Biochemical Oxygen Demand (BOD5). The results indicated that the bioreactor system can be used efficiently to treat the effluent of food industry from meat processing. The results of the first phase PI (after 5 days of fermentation) considered as the best phase, which provided the excellent removal efficiency of TSS, BOD5, and COD to reached 98.31%, 94.53%, and 95.56% respectively at HRT 24 h.

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2

Title : Research on Ultra-tightly coupled Integrated Navigation Method Based on ZYNQ-7020

Authors : Juhao Tan, Shuai Chen, Chen Wang

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Abstract :

For conventional loosely coupled Integrated and tightly coupled Integrated, when the number of satellites is less than 4, there may be cases where positioning is impossible. Besides, market demand for miniaturization of navigation products. This paper overcomes the above shortcomings with the ultra-tightly coupled integrated method of Zynq-7020 as the platform. The paper Introduces the software scheme, the hardware scheme, the ultra-tightly coupled integrated mathematical model and filtering fusion algorithm in detail. In addition, a multi-channel SINS assisted fast frame synchronization algorithm is added to quickly recapture and track satellite signals. Finally, the feasibility and reliability of the design scheme are verified by high dynamic simulator test and vehicle test.

9-13
3

Title : Analytical calculation of tube counts and geometric characteristics of tube layouts of heat exchangers

Authors : Andrew Ch. Yiannopoulos

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Abstract :

The optimum design of shell-and-tube heat exchangers is an interesting subject in engineering, because it is interrelated with constructional, operational and economic issues. In the present work a detailed geometric consideration of tube layouts is conducted and a method for precise calculation of tube counts is given. Furthermore, some issues concerning the design of tube-sheets and baffles are examined. The calculations were performed through a mathematical approach by introducing a characteristic parameter, the value of which depends on the number of tubes and therefore can be given in tables. A simple working equation was also derived for the calculation of shell diameter of a heat exchanger for a given number of tubes, tube diameter and tube pitch. The results, compared with those obtained by approximate relationships or tables available in the literature, showed that the method of the present study is complete, rapid and with the best accuracy.

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4

Title : Extreme rainfall estimation on Bia watershed River in south-eastern of Côte d’Ivoire: theoretical and practical approaches application

Authors : KOUASSI Kan Martin, YAO Koffi Blaise, MELEDJE Ndiaye Hermann, KOUASSI Kouakou Lazare, SORO Nagnin, BIEMI Jean

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Abstract :

This study objective is to evaluate Gumbel's law exclusive use relative error of the in favor of theoretical and practical laws in extreme rainfall quantile estimation. To do this, an extreme rainfall database from 1941 to 2000 from the Bianouan, Agnibilékro, Adiaké and Ayamé rainfall stations on the Bia River watershed was established. The results analyzes show that the Fréchet and normal Log 2 laws are respectively the ideal laws of the theoretical and practical approach. In addition, a Gumbel's law exclusive use underestimates extreme rainfall quantiles compared to two approaches. Thus, Gumbel's law use could be justified by an economic or operational issue insofar as it understates the structures while minimizing the cost.

24-28
5

Title : Microcontroller Based LPG Gas Leakage Alert System

Authors : Manas Halder, Sumanta Chatterjee

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Abstract :

The main focus of this paper is to discuss how gas sensors are made using Arduino microcontroller. Arduino is a microcontroller by which many instruments can be made; from these we have made “Gas sensor”. In this authentic model a gas sensor model i.e. mq-6 gas sensor is used for sensing LPG gas from environment and allows user to be aware of the leakage of that. For being aware a buzzer is used to be aware of and interrupt the user to the hazards of the consumption of the destruction of gas leaking. This module will effective to detect LPG leakage in domestic purpose, factory, petrol pump etc.

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6

Title : Implementing Covert Channels to Transfer Hidden Information Over Whatsapp on Mobile Phones

Authors : Esmira Mustafayeva, Gunay Huseynova, Vagif Gasimov

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Abstract :

Covert channels may be used to ensure protection of information during legal transfers, as well as for illegal and secret transfer of official and commercial secrets, confidential and individual data, and state secret with the purpose of sharing necessary information to commit a crime. Therefore, the problem of transferring hidden information to create covert channels over WhatsApp has been studied in the article, and the possibilities of using different graphic file formats, as well as using existing stenographic software developed for Windows and Android operating systems have been investigated.

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7

Title : Time-domain Numerical Simulation of Flooding ship

Authors : Miao Xia, Guan Qun Xia, Xin Xia

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Abstract :

In the past 100 years, countless accident cases have shown that ship damage will directly pose a serious threat to personal and property safety. Therefore, research on important parameters such as water stability and sunk time of damaged ships has been the focus of industry research. Ship damage and water inflow is an extremely complicated process, involving the interaction of various factors such as hull movement, internal and external flow field and exchange, and it is difficult to establish an accurate theory based on its typical nonlinear flow  model, Due to the increasing maturity of computational fluid dynamics, it is not difficult to simulate the damage influent process. Many scholars have used FLUENT software to simulate it, which is consistent with the experimental comparison, indicating the feasibility of CFD for broken water. However, FLUENT relies on the characteristics of UDF and its single monitoring and setting complexity has been increasingly exposed. With the advent of STAR-CCM+, this defect is completely compensated, and its overlapping  modules in the motion module have greatly improved Grid quality and calculation speed.This paper briefly introduces the calculation process and makes theoretical preparations. Then based on the commercial software STAR-CCM+ and reference to the experimental results, the comparison between numerical simulation and experiment is carried out to verify the effectiveness of the calculation method.Then select a DTBT5415test model for foolding  process simulation.

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8

Title : Experimental Study on Rolling Motion Model of a Quad-Hull-USV

Authors : Zhiwei Cao, Songling Yang, Bao jiang Wang, Chenyi Zhuang

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Abstract :

At present, the ship type of USV is relatively single. When the USV encounters harsh sea conditions, it is relatively difficult to carry out the task, which affects the safety of the USV and the degree of the task execution. This paper studied a roll attenuation test of a new type of small waterplane area quad-hull-USV in six working conditions. We changed the composition of restoring torque and damping to established four different mathematical models of roll damping. Based on the theory of system identification and intelligent optimization algorithms, we adapted a piece of self-programming software for system identification including genetic algorithm and particle swarm optimization algorithm developed in C# language in our research. The rolling test data under six working conditions were identified and analyzed. The optimal rolling motion mathematical models under different working conditions were obtained, and the variation trend of moment coefficients under different draft water was analyzed. By comparing the relative error values, the reliability of the self-programming software for system identification was proved. It provides a good basis for further research on the advantages of quad-hull-USV.

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9

Title : Analysis of the Pitching Motion Mode of Three-body Rescue Unmanned Craft Based on System Identification

Authors : Di Zhang, Songlin Yang, Zhaozhao Ma

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Abstract :

In view of the excessively large pitch of the unmanned craft, the navigation performance may be degraded. Taking the vertical motion mode of the new three-body unmanned craft model as the research object, the pitch attenuation test was carried out in stable water. Now we established four mathematical models for tilting system identification, it based on the system identification method and the improved programming idea of genetic algorithm, adapting the system of tilting motion mode system identification. It is concluded that with the more draught, the more peak value of pitching speed, and with the increasing the time of the craft model to reach steady. Secondly, the equation of the model of pitch motion of the craft with the best effect is obtained, and the feasibility and adaptation of the model and the reliability of the software; finally, the three-body craft model has the anti-rolling effect, but in a small angle, the variation interval of linear damping moment M of catamaran model is relatively stable from 0.12 to 0.085. The system identification method and software provide a feasible way for such three-body unmanned craft pitching and other swaying modes.

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