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American Journal of Sciences and Engineering Research

Journal Papers (28) Details Call for Paper Manuscript submission Publication Ethics Contact Authors' Guide Line
1 Development and Testing of Elasticity Tine Attached to Small Tractor for Saccharum Weeder in Thailand , Dr. Ashok Kumar Sain, Prof., Arun k. Gupta
Removal of weeds from sugarcane fields is of utmost importance for optimizing sugarcane production. If weeds are not removed from sugarcane field at the right time, the yields are estimated fifty percent reduced. The traditional weeds control in sugarcane is chemical usage even though it is unsafely and unfriendly to environment. The mechanical weed control is one of the optimized methods of green technology; The spring tine cultivator attached to a small side riding tractor was developed by Agricultural Engineering Research Institute Five legs of coil spring tine were set in 2 rows; two and three times in first and second row by arranging in different positions. Of the two types of developed spring tine cultivators, type I used a coil shank and a full sweep head tine is called coil spring type. The spring tine cultivator type II is called S spring type used S-shape shank was and Mcgregor head tine type. The field validation was in Konkani province, Thailand. The average field capacity of spring tine cultivator type I and type II were 0.5 and0 0.6 ha/hr. The weeding efficiency of spring tine cultivator type I and type II were 94.7 and 97.0 percent. The fuel consumption of spring tine cultivator type I and type II were 5.9 and 4.8 liter per hectare respectively. Two types of spring tine cultivator had high working capacity and high weeding efficiency but low fuel consumption. This equipment can be adequately used for weed control in sugarcane
2 Solution for Combined Commercial and Ejection Dispatch , Haseena, Thara M
An efficient and optimum economic operation of electric power generation systems has always occupied an important position in the electric power industry. A power system operation at minimum cost is no longer the only criterion for electrical power dispatch. Combined economic emission dispatch problem is obtained by considering both the economy and emission objectives with required constraints. The purpose of Combined Economic and Emission Dispatch (CEED) is to minimize both the operating fuel cost and emission level simultaneously while satisfying load demand and operational constraints. This paper presents an optimization algorithm, for solving security constrained combined economic emission dispatch problem, through the application of programming method. Many optimization techniques are slow for such complex optimization tasks and are not suitable for on-line use. The proposed method has been tested on IEEE 30-bus test system and found to be suitable for on-line combined economic emission dispatch
3 Ameliorated RMPA using ‘Squares Enveloped by Hexadecagon’ Shaped Double Negative Metamagnets Structure in Ultra High Frequency (UHF) Band , Okonor A, Ezeja C.A
Authors analyzed and explored a significant concept of rectangular microstrip patch antenna configured by double negative left handed metamaterial which have dielectric permittivity & magnetic permeability both negative simultaneously. Metamaterials are artificial structures exhibits double negative properties. They can control Electromagnetic radiations by quantum mechanics. This work deals with miniaturisation of patch antenna using metamaterial. Rectangular microstrip patch antenna without proposed metamaterial is designed to resonate at 2.322 GHz. The antenna with metamaterial is proposed and analyzed at a height of 3.276 mm from the ground plane. The antenna along with the proposed metamaterial is designed to resonate at 0.909 GHz frequency. Main work in this design process is reduce the size of the antenna, and this target has been achieved by reducing the size of antenna up to 85% and also reduce the return loss from - 10.269 dB to -46.06dB and increases the efficiency of the antenna from 47% to 72%. In this paper authors have used the computer simulation technology microwave studio (CST-MWS) simulation software for designing and simulation, and MS-Excel for metamaterial proving. Copyright © AJESTR, all rightsreserved.
4 The Perception and Nature of War in the ‘Pagan Societies’ of North Central Nigeria from the Earliest Times to 1920 , Amin Zaigi
In a time and day, when man is unleashing unusual animalistic tendencies with unbelievable manifestation of raw brutality and barbarism, it has become necessary to once again look back at the past and learn from the forebears how emotions, conflicts and disagreements were resolved. Recent evidence suggests that war is not an innate part of human nature, but rather behavior adopted more recently. Violence in early human communities was driven by personal conflicts rather than large scale battles. This paper argues that warfare among the societies of North Central Nigeria was governed by many conventions that did not permit wanton destruction of lives and property. It contends that warfare was non imperialist in nature neither did it support conquests. This paper concludes that the absence of centralized state structures in most of the societies of Central Nigeria supports this fact. The lesson we glean from the past is the importance of ethics, humanity and respect for human life. Lessons and values, this paper argues, that have been thrown to the dogs
5 Duplicate for Three Phase to Two Phase Transformation , Sulfi A Samad, Punya S, Ajitha J
This paper the model that has been developed so far is for two phase machine Three phase induction machine are common: [1]-[3]two phase machine are rarely used in industrial application . a dynamic model for the three phase induction machine can be derived from the two phase machine if the equivalence between three and two phase is established .The equivalence is based on the equality of the MMF produced in the two phase and three phase winding and equal current magnitudes. Shows simulation results are compared
6 Maximizing Wind Power Creation of DIFG-Based Wind Turbines at Low Wind Speed Operation , Amy Heider1 and Nancy Knechtel
This paper introduces an improved strategy to increase the power production of wind turbines equipped with doubly fed induction generators (DFIGs) at low wind speed operation. The performance of DFIGbased wind turbines at low wind speeds, close to the cut in speed, is investigated. A modified control to extend the concept of maximum wind power tracking to cover the low wind speed region is implemented. The associated effects of the expanding technique are examined. Reasonable value for the dc link voltage is investigated. A comprehensive time-domain model for the wind turbine with DFIG and the decoupled dq controller are implemented using Matlab/Simulink software. Simulation results are included to ensure the validity and feasibility of the proposed modification for low wind speed operation
7 Decidedly Long-Lasting, Decentralized Cargo Space Not Withstanding Gigantic Allied Failures , Glenn P* and Suzanne. Wagner
Cloud Storage System has a collection of storage servers provides long-standing storage services over the internet. Data privacy becomes a major concern in cloud storage system because user stores his data in third party cloud system. Encryption schemes available for data privacy but it limit the number of functions done in storage system. Building a secure storage system that supports multiple functions is tough when the storage system is distributed and has no central authority. A new idea is proposed proxy re-encryption scheme for decentralizes erasure code for defending the distributed system. The distributed storage system not only supports secure and robust data storage and retrieval, but also lets a user forward his data in the storage servers to another user without retrieving the data back. The main technical contribution is that the proxy reencryption scheme supports encoding operations over encrypted messages as well as forwarding operations over encoded and encrypted messages. Our method fully integrates encrypting, encoding, and forwarding.
8 A Survey on NFC (Near Field Communication) and FFC (Far Field Communication) With Respect To RFID (Radio Frequency Identification) for Next Generation Network Infrastructure , David Schoen
This paper gives us the comprehensive analysis of security with respect to RFID (radio frequency identification) considering the Next Generation smartphone attributes i.e. NFC and FFC. The electromagnetic field that outlines the RFID antenna can be divided into two parts NFC & FFC; both are based on existing standards of the radio frequency identification network framework. NFC (near field communication) is a set of principles for Smartphone and alike devices to establish Radio Communication with each other. In this study we will try to survey the critical issues of NFC and FFC to find out the updated implementation issues for the Next Generation network infrastructures.
9 Computer Network - IP Address & Subnetting , Shawn Kosmala, Dr. Carrie Teresa
The next-generation Internet Protocol, initially known as IP Next Generation (Ipng), and then later as IPv6, has been developed by the Internet Engineering Task Force (IETF) to replace the current Internet Protocol (also known as IPv4). Which offers 2128 possible addresses to enable the integration of IPv6 into current networks, several transition mechanisms have been proposed by the IETF IPng Transition Working Group? This work examines and empirically evaluates two transition mechanisms, namely IPv6 to IPv4 tunneling and dual-stack mechanism, as they relate to the performance of IPv6. The primary focus of this paper is to compare and analyze IPv4 and IPv6 networks, study their characteristics and header formats. The paper also attempts to outline the key deployment issues and security-related challenges which are being faced and dealt with during the migration process
10 Influence of Running Fluid and Operating Parameters on the Act of Traveling Wave Thermo Acoustic Prime Mover , Dr. Gamal Tag
The paper present the performance studies on a traveling wave thermoacoustic system developed in our laboratory. Experiments were carried out for different working fluids such as Helium, Argon and Nitrogen and at different operating pressures. The results indicate that the working fluids with different charge pressures are critical to the performance of the system. The above experimental results are compared with simulation (CFD and Delta EC) results wherever possible and they are in good agreement.
11 Performance Evaluation of Various Active Queue Management for Bufferbloat , Kanu Monga
Due to unprotected large buffers in network devices, the Internet is suffering from high latency and jitter which leads to decreased throughput. The perseveringly full buffer problem, recently exposed as “bufferbloat” [1] [2] has been observed for decades, but is still with us. As a solution to this problem, several new AQM algorithms CoDel, sfqCoDel and CoDel-DT have been proposed. This paper aims to evaluate these AQM algorithms by carrying out simulations in ns-2 and compares their performance with that of DropTail. sfqCoDel outperforms various peer solutions in variety of scenarios in terms of bottleneck link utilization, packet drop rate and mean queue length.
12 Reengineering Healthcare using Information and Communication Technology: Structural Equation Model for Healthcare Information Systems , Nizar Hussain M, Suresh Subramoniam
It is claimed that reengineering healthcare using Information and Communication Technology (ICT) can bring many benefits to the healthcare organisation. Many ICT applications remain underused by healthcare professionals and healthcare organisations. Human and organisational factors have frequently been identified as the main causes of ICT implementation underuse. Therefore, it is very important to identify the Critical Success Factors (CSF) necessary for the implementation of Healthcare Information Systems (HIS). Existing models of CSF on information systems related to healthcare sector are practically less, globally, and almost nil with respect to India. Hence, the purpose of this research is to develop a conceptual model of CSF especially for HIS adoption, use and redesign in India. Such identified factors for redesign will also have international bearing as redesign possibilities discussed are mainly based on emerging technologies. The rationale of the purpose is justified by the fact that India is a leader in developing information systems, especially medical applications. Further, India is emerging as an international destination for healthcare due to the advancement in medical technology and is offering high quality health services at reduced cost
13 A Fast FPGA based Architecture Implementation for Reversible Image Watermarking , Kunal G
Now a day’s different techniques are available for digital image watermarking including software and hardware implementation. Reversible contrast mapping (RCM) is one of the technique is used for embed secret information into the digital form. RCM algorithm is simple integer transform of the pixel pair and there LSB bits are used for data embedding. RCM offers high embedding rate, low mathematical calculation and good robustness. This paper focuses on implementation of Field Programmable Gate Array (FPGA) based fast image watermarking using RCM algorithm. The given architecture requires 52 slices, 52 number of flip-flop, 85 number of 4-input LUTs and transceiver data rate is up to 3.2Gbps with an operating crystal frequency is 100MHz. Given architecture is implemented with Xilinx 14.7 on Spartan-6 FPGA family. The given architecture is acceptable for various application areas such as digital cameras, medical and military applications, etc
14 Physico-Chemical Composition and Energy Content Analysis of Solid Waste: A Case Study of Castlereagh District, Northern Ireland , Adeyinka Sikiru Yusuff, Wasiu John, Oluwashola Okoro
The physico-chemical characterization of municipal solid waste generated in Castlereagh district in Northern Ireland was carried out. The solid waste type were observed to comprise of glass (9.59%), metal (2.74%), paper (25.83%), plastics (3.87%), compostable (organic matter) (57.48%), WEEE(0.22%) and other waste(0.27%). Both WEEE and other waste were lumped and referred to as uncompact municipal waste (UMW). The moisture content as-discarded, density and solid waste generation rate were obtained to be 16.3692%, 150.489kg/m3 and 25.94tonne/day respectively. Its chemical formula with and without sulphur were also determined and obtained to be C510.909H1136.545O476.891N13.255S and C38.546H85.748O35.979N respectively. The suitability of the municipal solid waste as a possible source of energy was also put into consideration; an energy content of the solid waste was determined and observed to be 14.74MJ/kg which is significant. Hence, it can be used to generate energy in Castlereagh district
15 Applicability of Becker’s theory of Allocation of Time in Modeling Married Women’s Allocation of time between Household Duties and Labour Force Participation in Zimbabwe , Anil gaur
With the rise in women participation in labour force and gender equality campaigns on the one hand and cultural norms which characterise women as house makers on the other, most married women often find themselves in a dilemma as to how to allocate their time among competing needs. This paper used a theoretical approach in reviewing the applicability of the proposals of Becker’s allocation of time theory to the married women’s allocation of time between household duties and labour force participation to the Zimbabwean situation. It was concluded that though the model ignores the cultural norms of assigning household roles to specific gender, it explained to a greater extent the trends observed in which women spend more time in household chores to which they have a comparative advantage as opposed to their male counterparts. The substitution and income effects explained in this model are also applicable to the preferences and patterns of time allocation by married when faced with a change in wages
16 Reengineering Healthcare using Information and Communication Technology: Structural Equation Model for Healthcare Information Systems , Nizar Hussain M, Suresh Subramoniam
17 Particulate Matter (PM2,5) Increases MDA Levels Serum of Workers at Surabaya Bus Station , John Burg, Aliyana H
: Particulate matter (PM2,5) in the air that are free radicals and enter through the respiratory station workers. Inability of antioxidants neutralize free radicals will increase MDA levels serum and cause oxidative stress. The aim of this study was to look at the differences in MDA levels serum and PM2,5 influence on MDA levels serumon several main station attendant Surabaya. The design of this study was an analytic observational with cross-sectional study. The population in this study was bus station workers and administration workers, large of samples were 12 people in each group. Measurement of PM2,5 with EPAM 5000 and MDA levels in serum using TBA test method. The results of t test analysis 2 free samples to show that there are differences in serum MDA levels were highly significant (ρ <0.05) in the bus station workers and administration workers. Multiple linear regression showed that there are significant PM2,5 exposure and body mass index (ρ <0.05) on serum levels of MDA. The conclusion of this study is the PM2,5 exposure can increased serum levels of MDA on several main bus station workers. Suggestions for health officials to control the station regularly and use a mask while on duty in the area of Surabaya station
18 Particulate Matter (PM2,5) Increases MDA Levels Serum of Workers at Surabaya Bus Station , John Burg, Aliyana H
Particulate matter (PM2,5) in the air that are free radicals and enter through the respiratory station workers. Inability of antioxidants neutralize free radicals will increase MDA levels serum and cause oxidative stress. The aim of this study was to look at the differences in MDA levels serum and PM2,5 influence on MDA levels serumon several main station attendant Surabaya. The design of this study was an analytic observational with cross-sectional study. The population in this study was bus station workers and administration workers, large of samples were 12 people in each group. Measurement of PM2,5 with EPAM 5000 and MDA levels in serum using TBA test method. The results of t test analysis 2 free samples to show that there are differences in serum MDA levels were highly significant (ρ <0.05) in the bus station workers and administration workers. Multiple linear regression showed that there are significant PM2,5 exposure and body mass index (ρ <0.05) on serum levels of MDA. The conclusion of this study is the PM2,5 exposure can increased serum levels of MDA on several main bus station workers. Suggestions for health officials to control the station regularly and use a mask while on duty in the area of Surabaya station
19 Importance of Exclusive Breast Feeding and Complementary Feeding Among Infants , AshmIkA M
The aim of this review is to document the advantages of exclusive breastfeeding along with concerns which may hinder the practice of breastfeeding and focuses on the appropriateness of complementary feeding and feeding difficulties which infants encounter. Breastfeeding, as recommended by the World Health Organisation, is the most cost effective way for reducing childhood morbidity such as obesity, hypertension and gastroenteritis as well as mortality. There are several factors that either promote or act as barriers to good infant nutrition. Factors which influence breastfeeding practice in terms of initiation, exclusivity and duration are namely breast engorgement, sore nipples, milk insufficiency and availability of various infant formulas. On the other hand, introduction of complementary foods, also known as weaning, is done around 4 to 6 months and mothers usually should start with home-made nutritious food. Difficulties encountered during the weaning process are often refusal to eat followed by vomiting, colic, allergic reactions and diarrhoea.
20 Estimation of Resistant Starch Content of Selected Routinely Consumed Indian Food Preparations , Mohd. Aziz
Resistant Starch, an important component of the diet, shows the potential health benefits against lifestyle diseases and many other health conditions. Resistant Starch (RS) refers to the portion of starch and starch products that resist digestion as it passes through the gastrointestinal tract, gets fermented in the colon by colonic microflora and produces short chain fatty acids which directly or indirectly help in preventing and/or controlling many diseases.Since the main sources of RS in the Indian diet are starchy foods like varieties of cereals, cereal products, roots and tubers, raw and processed legumes etc.it becomes important to determine the RS content of typical traditional Indian starchy cereal and legume preparations.Therefore the aim of this research was to estimate the RS content of selected, routinely consumed Indian food preparations and to determine the change in RS content of cereal and pulse preparations on cooking and on storage. RS content was estimated for two varieties of rice and four rice preparations, whole and refined wheat flour and four preparations made using these flours, legumes like whole moong, Kabuli chhana, Chana flour and preparations made using them. Five of these preparations were also analyzed for their RS content after an overnight storage in the refrigerator, to understand the effect of storage on their RS content. Amount of RS was estimated using the procedure given by Parchure and Kulkarni. RS content in freshly cooked preparations was compared with RS content in equivalent amount of raw ingredients. RS content of freshly cooked preparations was also compared with RS in equivalent amount of cooked and stored samples. Comparison of means was done using paired t test. One-way ANOVA was also used to compare RS content of freshly cooked rice preparations, wheat preparations and legume preparations. P< 0.05 was considered statistically significant.The RS content of raw food samples ranged from as low as 0.50g% in whole wheat flour to 27.67g% in Kolam rice. The two varieties of rice, Basmati and Kolam contained 20.22g% and 27.67g% RS respectively whereas Whole wheat flour and Refined wheat flour contained 0.50g% and 0.65g% RS respectively. The RS in raw legumes was 1.93g%, 1.98g% and 4.52g% in Kabuli Chana, Chana flour and Whole Moong respectively.Among four freshly cooked rice preparations RS varied from 0.46g% in cooked Kolam to 0.78g% in Khichdi. Among four wheat preparations (freshly cooked) RS content varied from 0.47g% in Puri to 0.61g% (food as eaten) in paratha. Chapatti and Bhatura contained 0.49g% and 0.54g% RS (food as eaten) respectively.RS in legume preparations ranged from 0.09g% in freshly cooked Pithle to 2.38g% in cooked Chole.
21 Nutrient Adequacy of Foods Eaten by Students Attending Boarding and Day Secondary Schools in Owo , Olanike A, Olaide F.
The nutrient adequacy of foods eaten by students attending boarding and day secondary schools in Owo municipal was assessed. The study was carried out among two day secondary schools and two secondary schools with boarding facilities. A total of 200 students were systematically selected from the class register. The 24-hour dietary recall procedure was used to assess food consumption and nutrients intake. The nutrient intake of the student shows that the intake of energy was 98% of RDA while that of protein was above RDA 123%. However, vitamin A, E, B6 folic Acid and vitamin C were found to be lower than RDA as intakes were 38%, 21%, 62%, 55% and 23% respectively. Also mineral intake shows that there is low consumption of calcium 43% while Iron intake exceeded RDA 127%. However, there was no significant difference in the energy intake of the day and boarding student while intake of vitamin C was higher among day students. Access to low cost healthy local foods especially fruits and vegetables in school and at home should be encouraged.
22 Estimation of Resistant Starch Content of Selected Routinely Consumed Indian Food Preparations , Mohd. Aziz
Resistant Starch, an important component of the diet, shows the potential health benefits against lifestyle diseases and many other health conditions. Resistant Starch (RS) refers to the portion of starch and starch products that resist digestion as it passes through the gastrointestinal tract, gets fermented in the colon by colonic microflora and produces short chain fatty acids which directly or indirectly help in preventing and/or controlling many diseases.Since the main sources of RS in the Indian diet are starchy foods like varieties of cereals, cereal products, roots and tubers, raw and processed legumes etc.it becomes important to determine the RS content of typical traditional Indian starchy cereal and legume preparations.Therefore the aim of this research was to estimate the RS content of selected, routinely consumed Indian food preparations and to determine the change in RS content of cereal and pulse preparations on cooking and on storage. RS content was estimated for two varieties of rice and four rice preparations, whole and refined wheat flour and four preparations made using these flours, legumes like whole moong, Kabuli chhana, Chana flour and preparations made using them. Five of these preparations were also analyzed for their RS content after an overnight storage in the refrigerator, to understand the effect of storage on their RS content. Amount of RS was estimated using the procedure given by Parchure and Kulkarni. RS content in freshly cooked preparations was compared with RS content in equivalent amount of raw ingredients. RS content of freshly cooked preparations was also compared with RS in equivalent amount of cooked and stored samples. Comparison of means was done using paired t test. One-way ANOVA was also used to compare RS content of freshly cooked rice preparations, wheat preparations and legume preparations. P< 0.05 was considered statistically significant.The RS content of raw food samples ranged from as low as 0.50g% in whole wheat flour to 27.67g% in Kolam rice. The two varieties of rice, Basmati and Kolam contained 20.22g% and 27.67g% RS respectively whereas Whole wheat flour and Refined wheat flour contained 0.50g% and 0.65g% RS respectively. The RS in raw legumes was 1.93g%, 1.98g% and 4.52g% in Kabuli Chana, Chana flour and Whole Moong respectively.Among four freshly cooked rice preparations RS varied from 0.46g% in cooked Kolam to 0.78g% in Khichdi. Among four wheat preparations (freshly cooked) RS content varied from 0.47g% in Puri to 0.61g% (food as eaten) in paratha. Chapatti and Bhatura contained 0.49g% and 0.54g% RS (food as eaten) respectively.RS in legume preparations ranged from 0.09g% in freshly cooked Pithle to 2.38g% in cooked Chole.
23 The Impact of Structure and Cage Climate on Productivity of Dairy Cattle in the Highlands Area , Natsir Abduh1 , Tamrin Mallawangeng2 , M. Tang3
There are four microclimate elements that can directly affect livestock productivity, namely temperature, humidity, radiation, and wind speed, while the other two elements, evaporation and rainfall, affect livestock productivity indirectly. The purpose of this study was to determine the impact of building structure and temperature of the cage on the level of milk production of dairy cows. The research location in Enrekang Regency which included in the highlands in South Sulawesi Province. The number of samples used is 35 samples from 50 existing cattle pens with purposive sampling technique. Data collection through direct measurements, observations, questionnaires and interviews. The results obtained there is no significant difference in temperature and humidity of the air in the cage and outside the cage. Temperature shifts from the comfortable range in cattle are sure to experience both hot stress (hyperthermia) and cold stress (hypothermia). Dairy cows need a place to live according to their needs. The cows cannot place in the same cage building because it will affect their health. The cage made primarily as a building for the management of dairy cows and its security against theft and predators.
24 The Vale Brazilian Dam Collapse: An Ethical and Engineering Disaster , Peter A. Stanwick, Sarah D. Stanwick
Vale S.A. is the largest iron ore mining company in the world. On January 25, 2019, Dam1 of Vale’s Corrego do Feijao iron-ore mine in Brazil collapsed. The dam was built upstream on a mountain in order to contain mining waste or tailings, which are made up of dirt, rocks and bits of ore that are dumped into a dam reservoir. The mining waste was estimated to be travelling as fast as 50 miles an hour downhill toward the city of Brumadinho. The mining waste killed 270 people within minutes, and it is the deadliest mining disaster of its type in more than 50 years. Mine sediment from the dam was found as far away as 119 miles from the dam. There were several causes for the dam’s failure including: the use of cheap materials, Vale’s managers ignoring warnings of structural problems, and monitoring equipment that was no longer working. Both Vale and its safety inspector TUV SUD are under criminal investigations for their actions leading up to the dam collapse.
25 A Study of Application of Tracers in Groundwater Hydrology , J.O. Jeje , O.O Fadipe
Laboratory study was carried out to investigate the effect of acidic and alkaline characteristics of groundwater medium on three tracers (rhodamine B, eosin and potassium dichromate) commonly used for groundwater investigations. This is with the view to improving the criterion used in the selection of tracers for groundwater investigations. The factors considered are: the maximum tracer concentration, Cmax, which could be observed during the experiment, the time, tm, at which this occurs and the percentage of the tracer recovered during experiment. Others are the time, ti, of first detection of the tracer and time, tf, of total disappearance of tracer from the investigation area.A lysimeter apparatus of circular cross section with diameter, D = 45 mm was constructed and uniformly filled with coarse sand and fine gravel (each at a time). Throughout the column, steady water discharge (2.5 ml/min) at a pH value between the ranges of 5 – 8 was maintained, to carry the tracer solution through the soil column. Effluent from the bottom of the lysimeter were subjected to spectrometric analysis to determine tracer concentration.. The results suggest that rhodamine B is a suitable tracer for groundwater investigation in acidic medium but may not be suitable for alkaline medium. Values obtained for eosin showed the tracer to be good for investigation in both acidic and alkaline medium,while potassium dichromate as a tracer may be a good tracer in alkaline medium only.
26 The Effectiveness of Group Work Role Play on EFL Students’ Accuracy in Speaking Skill at Dong Nai Technology University , Thu Tran Thi Minh , Duyen Vu Thi
In recent years, role-play activities have been widely used in the ESL/EFL classroom as an effective teaching method. This research paper aimed to investigate how group work role play activities can produce effect on students’ accuracy in speaking skill as well as how students get involved in the activities at Dong Nai Technology University. The experiment lasted in eight weeks and about fifteen students took part in this project. Oral tests were designed at the end of the experiment to measure students’ improvement. In addition, three research methods employed in my research were observation, semi-structured group interview and students’ diaries in order to perfectly understand how group work role play activities affected the participants and their attitude toward role play. The research paper came up with a positive result that all students participated in the activities and generated strong motivation in the classroom. As the research observed, the lessons with role play seem to be more interesting and attractive. In the contrast, an unexpected outcome was that role play could help improve students’ fluency but not accuracy. This paper points out both strong and weak aspects of using group work role play in improving students’ accuracy in speaking English. Based on the principal findings, conducting this research greatly affects our future practice as teachers. We believe that this research can help us respond to new challenges and become a better practitioner. As a consequence, this process would make tremendous impacts on our future practice.
27 Applying Task-Based Language Teaching (TBLT) To Enhance Students ‘Communicative Grammar Competence at Dong Nai Technology University , Nguyen Hong Ngoc
Grammar teaching and learning play important roles in English acquisition. However, Vietnamese educational system still favors grammar written tests to evaluate students’ English proficiency. Therefore, students tend to learn more about language forms rather than meaningful language use. This has no doubt resulted in students’ poor communicative ability. Task-based language teaching (TBLT) is a suitable teaching approach, if applied to teach grammar for teenager students, it will not only promote their communicative ability but also instruct them to use grammar correctly and comprehensively. In other words, teachers use TBLT to balance the learning process in which learners both fulfill meaningful communicative tasks and comprehend linguistic forms. In spite of the benefits brought to learners by TBLT, they are still in theory. Therefore, in order to bridge the gap between theory and practice, it is essential to conduct a study which can prove the effectiveness of applying TBLT. As the matter of fact, the research question is ‘How do students respond to grammar learning with TBLT?’ The objective of this work can only be achieved by collecting and analyzing data, so choosing research methods has to be done accurately and carefully.
28 Using Jigsaw Strategy for Teaching Reading to Teenager Learners in Vietnam , Huynh Nhu Yen Nhi
This paper indicates strong points of using the jigsaw strategy for teaching reading to teenagers. Two kinds of datasets including survey and interview provided the researcher with enough evidence in order to judge innovation. Although this is not a very successful innovation, it helps the researcher experience jigsaw reading lessons in her own teaching context. Vitally important, the innovation helps engage students in reading lessons and create meaningful interaction among them. Therefore, the research results will be applied into other reading courses at institutions in Vietnam and the researcher hopes that it might be useful for those who are interested in teaching reading through the jigsaw strategy