The investigation was conducted in 19 standard squares (each square area is 2,000 m2) in the six kinds of biotopes of Ham Rong mountain belonging to Phu Quoc National Park. From the results collected, we constructed the list of vascular plants including 353 species belonging to 215 genera of 85 families in 4 phyla. There were 49 species to be added to the list of Phu Quoc National Park. A resource of useful trees and endangered trees was also investigated in which 271 useful species (76.77% of the flora) and 11 species (3.12% of the flora) have been identified in ?Vietnam Red Book? (2007).

Chattering phenomenon around sliding surface and sliding control law makes some drawbacks for control problems while using sliding mode controller. In practice, some actuators are unable to satisfy from the phenomenon. Therefore the paper presents a method using sliding mode controller with type PID (Proportional integral derivative) based sliding surface for controlling nonlinear system. The solution is proposed for reducing chattering phenomenon surrounding sliding surface and sliding control law. The algorithm is applied to control one degree of freedom robot manipulator. Simulation results are implemented basing on Simulink software of MATLAB as following: the response of one degree of freedom manipulator tracking desired signal with overshoot 0.02%, settling time 3.1s, steady-state error being not worth considering, the chattering phenomenon round sliding surface and sliding control law being completely eliminated.

The paper aimed to reviews business efficiency of the system of Vietnam joint stock commercial bank. Especially, the study assessed impacts of economic crisis on operating performance in the period of before and after year 2008. The paper used assessment traditional methods based on analysis of the financial ratio indicators. Results indicated that the system of joint stock commercial bank contributed to economic growth. Generally, performance efficiency of the system affected by the negative impact of the 2008 global financial crisis was reflected in the most indicators. In particular, the small-scale bank was more seriously affected and recovery was slower as compared with the large-scale and medium banks.

Continuing to the chemical study on Achyranthes aspera L. (Vietnamese: Ngưu tất, family Amaranthaceae), after the previous paper described the result study on materials of Tra Vinh province, we now focus on the raw materials collected in Vinh Long province. From the different polarity extracts, we have isolated and identified four compounds: dodecanoic acid, stigmasterol, ?-D-glucopyranosyl-(1?2)-?-D-fructofuranoside, and quercetin. Their structures were evaluated by spectrum data of MS, 1H, 13C, DEPT NMR and 2D-NMR.

Classic solvent extraction processes were defined and have recently been improved through physical concepts such as supercritical CO2 extraction (SCE), supercrtitical fluid extraction (SFE), ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE) processes, etc. All these processes usually need a pretreatment, a stage of grinding, in order to reduce the size of treated particles. A new solvent extraction process using grain expansion under the impact of DIC technology (Détente Instantanée Contrôllée) has recently been applied to intensify the extraction kinetics and reduce thermal degradation reactions. In this work, we carried out the first approach based on the mathematical model and data validation of the solvent extraction kinetics of the expanded jatropha granules using DIC technology. The results show that grinding granules into fine particles and the swelling thanks to the application of DIC improve significantly the solvent extraction kinetics. The specific mathematical model of solvent extraction was established and used for validation. The results also indicate that there exist a higher exchange in surface and a greater internal diffusion of the experimental DIC group compared to the control group.

This study reviews the literature of the analytic hierarchy process (AHP) applications in supply chain management. A total of 70 papers published in high quality management journals from 1999 to 2009 are compiled and categorized by each element of supply chain; namely, supplier, manufacturer, distributor, and customer. The content of these papers are analyzed to solve the research objectives: (i) The application of AHP in supply chain management; (ii) Success factors of AHP implementation and (iii) The opportunities for future research. This review will help researchers and practitioners have a broader understanding regarding application of AHP in supply chain management.

From the petroleum ether extracts of the roots of Sonneratia caseolaris L., collected in Tra On district, Vinh Long province, two compounds have been isolated: lupeol (C30H50O) and betulinaldehyde (C30H50O2). The structures of these compounds have been elucidated by modern spectroscopic methods: 1H-NMR, 13C-NMR, DEPT NMR.

Shrimp classifying is a compulsory stage in food processing manufactories. This paper presents a research on designing a prototype for a shrimp classifying machine to replace workers, to increase productivity and accuracy of the classifying process. Based on the principle of weight sensing, the machine can recognize the category of each shrimp and drive it to the correct position. Results of testing show that the machine can work well in the laboratory condition.

Project "Energy Audit Technology" was conducted in two stages, a preliminary audit then the audit detailing lighting, air conditioning systems and other office equipment is in the Faculty of Technology, to identify opportunities to save energy, then measuring and calculating the power-saving options, and then propose solutions to save energy when purchasing new investment, installation, commissioning devices operating in the above system. Research, design a control device switching system in the classroom lights to save power and study a power-saving slogan mounted in classrooms appropriate to raise awareness of energy saving students.

This paper presents the results of study on chemical composition and some of anti-microorganism activity of ginger essential oil (Zingiber officinale Roscoe) and black pepper essential oil (Piper nigrum L.) in Me Kong Delta. The volatile oil obtained by the steam distillation without and with the assistance of microwave. The chemical composition of volatile oil was analyzed by GC?MS. Antimicroorganism was tested by MIC method.

The fact that freshmen at universities in Viet Nam in general and at Can Tho University in particular face many difficulties in their first school year, especially in academic affairs, is of great concerns to many people including educational managers, teaching staff and families. The project ?The Opportunities and Challenges Facing Freshmen in Their Academic Affairs at Can Tho University? aims to explore the freshmen?s benefits and difficulties in study at Can Tho University in order to propose feasible solutions that help them overcome the problems and get the best results in study. A survey has been implemented through a 36-item questionnaire and one-on-one interviews with both freshmen and lecturers at Can Tho University. This article reports research results from quantitative data given by 703 freshmen at Can Tho University. The results show that besides several benefits, the freshmen have many problems that negatively affected their academic achievements. These problems mainly resulted from 3 sources: (1) the students themselves, (2) the teaching staff, counselors, and (3) the management, families and friends. Several suggestions to help students overcome the problems by the participants are also presented.

This paper proposes a set of mathematical models presenting electric and magnetic fields caused by operations of a high voltage transmission line under normal loading conditions. The mathematical models are expressed in second-order partial differential equations derived by analyzing magnetic field distribution around a 500kV AC power transmission lines. Finite element methods (FEM) for solving wave equations have been exploited. The computer simulation based on the use of the FEM has been developed in MATLAB programming environment. The problem of study is intentionally two-dimensional due to the property of long line field distribution. From all test cases, the calculation line of 1.0m above the ground level is set to investigate the electromagnetic fields acting on a human in comparative with ICNIRP (International Commission for Non-Ionising Radiation Protection) standard.

The paper aimed to analysis of factors affecting the performance the system of joint stock commercial bank in the period 2006-2009. The article used two methods: Total Factor Productivity and Data Envelopment Analysis. The results indicated that operating efficiency was decreasing and the main reason was due to inefficiency in terms of technical inefficiency. Banks that had a larger scale had a higher cost advantage. The inefficiency in input uses was estimated at 7.7 percent and the number of decreasing to scale-atriubuted banks was decreasing.

The present work examined biodiesel production from a non-edible oil, namely rubber seed oil (RSO). Crude rubber seed oil (CRSO) contains high free fatty acid contents and impurities. For these reasons, a three-stage process viz., pre-treatment with methanol, acid catalyzed esterification and alkali catalyzed transesterification was developed to convert CRSO to mono-esters. The major factors concerning to the conversion efficiency of the process were molar ratio (methanol/oil), amount of catalyst, reaction temperature and reaction duration. The quality of biodiesel was evaluated by the determination of important properties such as density at 15oC, kinematic viscosity at 40oC, acid value (AV), iodine value (IV), peroxide value (PV), fatty acid composition, the oxidation stability (OS), fatty acid methyl esters content, copper strip corrosion (50oC, 3 h), cetane nuber (CN), free glycerin, total glycerin and methanol content. The results?indicated that RSO may be considered as a promising biomass source for biodiesel production.

To select bacterial strains which could hydrolyse starch, twenty five samples of wastewater were collected from wastewater ponds at Sa Đec town, Dong Thap province.Twenty three isolated bacterial strains had various shape. Cell shape of these strains were short rod, long rod or streptococcus. Most strains were motile. Among 23 strains, 13 strains were gram negative and 10 strains were gram positive. Isolated strains had amylase activity from 72.44U/ml to 910.89U/ml after incubating 72 hours. Among them, 4 strains which had high amylase activity were 935,VD2, 92, and 16. Strains 935 and VD2 could hydrolyse up to  97% of starch in wastewater after only 24hours.

The study aims to identify and segment the Eco-tourism market in Cantho city. The result identifies three distinct segments: simple life/simple beauty seeker, nature, family and outdoor activities seeker, novelty seeker. The study also identifies demographic, behavior characteristics, and benefit sought by tourists of each segment. The results provide information which could be used to develop product strategies for target market for tourism suppliers in Cantho city in order to develop the Eco-tourism in Cantho efficiency.

The inverse potential field problem for determination of the geomagnetic anomaly boundaries (3D) in the Mekong delta was carried out by continuous wavelet transform. The data filters with the parameters were chosen appropriately have improved the resolution for the proposal method of analysis. The relative shape and size of the geophysical source was estimated from contour lines of the wavelet transform modulus maxima. The analytic results by multiscale edge detection method (MED) using experimental data of the Mekong delta show that there were 36 magnetic anomaly sources of different sizes in this region. The result of the location, depth and size of these source is consistency to the traditional methods  before, but the level of detail for this technique is much higher.

Text document classification, basically, can be considered as a classification problem. Automatic text document classification is to assign a label to a new document based on the similarity of the document with labeled documents in the training set. Many machine learning and data mining methods have been applied in text document classification such as: Naive Bayes, decision tree, k ? Nearest neighbor, neural network,? Support vector machine (SVM) is an efficient classification algorithm. It has been applied to machine learning and recognition field. However, it is still not efficient in applying to text document classification because, by the nature, this problem often deals with a large feature space. This paper focuses on applying SVM to text document classification and compares the efficiency of the method with the one of decision tree, a traditional classification algorithm. The research illustrates that SVM along with the feature selection based on the singular value decomposition (SVD) is much better than decision tree method.

In today situation of globalization, the business ethics is very important criteria to help the enterprises get success in their business and to be involved in the global market. However, more and more firms are intend to break business ethics. One of the reason might be it is difficult to definine what is ethic. Thus, the business ethics depends on the perceptions and activities of the enterprises. Thereby, the research carry-out a survey about perceptions of business ethics of economics students - School of Economics & Business Administration of Can Tho University and suggested recommmendations for the school and the Ministry of Education & Training.

This paper presents the results on separating, identifying the chemical composition  in Areca catechu L. roots in Phong Dien district, Can Tho city. The results showed that two compounds: lamotrigine (C9H7N5Cl2) and a,a-trehalose (C12H22O11) were isolated from the ethyl acetate extracts.  The structures of these compounds have been elucidated by modern spectroscopic methods: ESI-MS, 1H-NMR, 13C-NMR, HSQC, COSY and HMBC.

?Tam van phong dao? written by Mac Can is the novel that won the A prize in the novel award contest hold by the Vietnamese Literature League in 2005. This novel is so successful that it has attracted the readers? attention in recent years. The novel not only has a remarkable humanistic meaning but also reflects the life in Southern region of Vietnam in a particular stage. With the plain and truthful penmanship as well as the art of telling story naturally and flexibly - used by a personal method - this literature work can express such a private writing style which is extraordinary and fantastic. The story being told is not monotonously, thus, it does not have the readers have such an extremely boring feeling. The story just evolves naturally as if there were not any available arrangements throughout the story-line. That makes this literature work not only truthful but also easy. As a result, it can totally achieve the artistic effect.

In this study, the total yeast and mould counts of five collected commercial alcoholic fermentation starters were determined (yeasts: 7,49 - 10,23 log cfu/g and moulds: 5,93 ? 7,61 log cfu/g), and 26 isolates of yeasts were obtained. Five yeast isolates performing their good fermentative capacity were selected and compared with the control yeast Saccharomyces cerevisiae. This research also examined the production of enzyme amylase activity of rice malt during 7 days of germination incubation, in which the highest enzyme activity was obtained after 4 days (9,0 U/g). In addition, in this study the laboratory-scale process for mixed starter including Saccharomyces cerevisiae and rice malt powder was prepared following the mixture ratio at 1:3, 1:4 và 1:5, respectively.

This paper reports the results of the study on chemical composition and some anti-microorganism activities of Plectranthus amboinicus Lour essential oil. In this study, the volatile oil was obtained by the steam distillation without and with the assistance of microwave. The chemical composition of volatile oil was characterized by GC?MS. While the anti-microorganism was tested by Minimum Inhibitory Concentration method (MIC). It is shown that, the main chemical compounds of Plectranthus amboinicus Lour are carvacrol (69%), cymene (9%). The essential oil is good anti-microorganism agent.