The memetic algorithm, the genetic algorithm (global optimization algorithms) are applied to determine the thickness of a 2-D sedimentary basin whose density contrast varies with depth as a parabolic function. This memetic algorithm is a combination of the genetic algorithm and the Quasi-Newton local search. These algorithms have been tested on a synthetic model and the interpretable results are coincident with model. Then, they are applied on the Bac Lieu gravity anomaly in the Mekong Delta. The results showed that the calculated depths by two methods above are coincident together. The minimum and maximum computed depths are 0.3 km – 0.4 km and 1.6 km, respectively. Furthermore, the memetic algorithm reaches to a solution faster than the genetic algorithm

In recent years, the development and application of Geographic Information System (GIS) in management works becomes popular in different fields. Typical systems that can be mentioned are the information systems for urban infrastructure management, the urban planning management systems and the land used management system. Nevertheless, the planning and using land management is still shortage of some support tools. For instance, the land valuation is based on legal regulations is usually specified by the annual land price table which is promulgated rovincial People's Committee without providing a computational tool to support the calculating effectively and rapidly. In this article, the method to develop a system was used that will integrate topical data classes including cadastral, topographic and traffic map layer data on the same reference system. In addition, this research propose a method to build automatically the price of land map according to the price of land regulation document of the Provincial People's Committee combine with the cadastral map. For this research, our experimental data is essentially at 1 Ward in Soc Trang Province and the initial experimental result shows that the GIS is integrated the automatic land valuation which is based on the land price list that is regulated by the Governmennt. Furthermore, the system is integrated a supporting estimate tool indemnifying expense to perform clearance the ground for a specific planning project.

Unregulated urban development, high greenhouse gas emission and rising energy cost and increases in service demands have been a pressure in the cities. This study is aimed at monitoring urban greenhouse gas emission and applying "green solutions" to reduce greenhouse gas emission which is one of the economic solutions in “green urban” development strategy. It is to use satellite images on Google Earth and apply object-based image analysis (OBIA) method to create a green tree map in Ninh Kieu district. The result showed that the green tree area is of 621.62 ha with overall accuracy at 85.71% (K = 0.71). Such a tree density in Ninh Kieu district accounts for 50-60% of the standard by the Ministry of Construction. With this green tree area, it could only absorb approximately 60% of greenhouse gas emissions (226,891.30 tons of CO2 equivalent) while the total emissions in three fields including energy, agriculture and waste was calculated at 734,740.48 tons CO2 equivalent.

Rain water is an alternative water resource for residential water purposes of the Mekong Delta, especially under impacts of climate change. However, the cost of rainwater harvesting system is still high for the low-income households in the Delta, in which the most expensive is the storage tank. This study is to optimize the rain water storage at household level for suitable volume, from that reduce the cost of the system. This study was conducted from July 2016 to March 2017 in Soc Trang city, Soc Trang province. It was 2-step as follows: 1) Interviewing 102 households on their current domestic water demands and capacity of rainfall; and 2) Optimizing the rain water storge tank according to the results of step 1. The study found that the average demand of a household is from 300 to 500 L/ day, the roof area is from 50 to 100m2, the water storage area is from 1 - 3 m2. With such water demand and storage area, the optimal tank volume is various from 1 - 3 m3 according to the tank material. The terracotta vessels is the lowest cost and the optimum tank volume is 1 - 3 cubic meters, the concrete tank is the highest cost and the optimal tank volume from 0.5 - 2 cubic meters.

In this paper, the aim is to provide a vector version of Ekeland’s theorem related to equilibrium problems when dealing with bifunctions defined on complete metric spaces and with values in Hausdorff locally convex spaces ordered by closed convex pointed cones. To prove this principle, a weak notion of continuity of a vector-valued function is considered, and some of its properties are presented. Via the vector Ekelands principle, some existence theorems on solutions for vector equilibria are proved in compact domains.

The main purpose of this article is to use Trotter-Rényi distance to solve Poisson approximation problems in d-dimensional space. Besides solving the problem for the case of determination sums, this article also considers the case of random sums. The results are extensions and generalizations of some known results.

In this paper, a strong vector equilibrium problem (SVEP) which objective function given by a sum of two funtions is considered. By using nonlinear scalarization and metric projection, a projection iterative algorithm for solving SVEP is built. To fulfil it, an auxiliary problem (AP) for SVEP is investigated. Moreover, some properties of objective function given by a sum of two funtions and the relationship between two problems, SVEP and AP, are studied. And then, a projection iterative algorithm for SVEP is proposed. Results obtained in this paper generalize the corresponding ones of Wang and Li (Wang and Li, 2015).

The aim of this project was to isolate the xanthine oxidase (XO) from cow milk, determine the optimal conditions for activity of the isolated enzyme, and prove that this enzyme could replace the commercial enzyme in research about inhibiting the activity of this enzyme. The XO was isolated from cow milk by ammonium sulfate precipitation method, with the concentration of 0.509 mg protein/mg crude extract. Enzyme activity and specific activity of XO were 0.2095 U/mg crude extract and 0.412 U/mg protein, respectively. The optimum conditions for the enzymatic activity were determined at pH 7.5, 25°C, 0.02 U/mL enzyme XO, 0.15 mM xanthine. The inhibitory effect of allopurinol to the activity of the isolated and commerical XO enzyme were comparable. The results indicated that the commercial enzyme could be replaced by the XO enzyme isolated from cow milk in research about inhibiting the activity of this enzyme.

The study was conducted to assess the impact on protein hydrolysis by the activity of intracellular protease from head meat of white shrimp (Litopenaeus vannamei). The research’s content includes the influence of freezing storage time on protein hydrolysis process. In addition, activation of the pre-treated intracellular protease enzyme was optimized by using a response surface methodology (RSM) with three factors: temperature, pH and time. Hydrolysis time of protein from shrimp head’meat with the activated intracellular protease was also investigated. The results showed that the freezing storage time was maximum for 6 weeks. The optimal conditions for hydrolysis were found to be a pH of 6.95 combined with a pre-treatment at 57.5°C for 3.78 minutes. At the time, the yield of hydrolysis (DH%) increased up to 41.12%; the protein content reached 44.33 mg/100g after 6 hours of hydrolysis.

Rosemary, original from Mediterranean, is widely used in scenic decoration and food and pharmacy industries. Rosemary is a new plant in Vietnam and there is a little result of fertilizer applications for this plant. A two-factorial experiment was laid out in split plot design (SPD) with three replications. The main plot factor was 3 growing substrates ((i) Control (without organic fertilizer - 35% sand + 37,5% rice husk ash + 37,5% coco peat, (ii) 30% vermicompost + 35% sand + 17,5% rice husk ash + 17,5% coco peat, and (iii) 30% manure + 35% sand + 17,5% rice husk ash + 17,5% coco peat). The sub-plot factor was six nitrogen concentrations (50, 100, 150 200, 250, 300 ppm; where 150 ppm as the control). The results showed that rosemary grow best in the  substrate mixed with vermicompost (ii) and applied  nitrogen  concentration of 100 ppm at dose of 150 mL/plant/dayin the first month after transplanting and then 300 mL/plant/day from the second month onward.

This study is aimed to evaluate the applicability of data mining technique by using decision tree in land evaluation. It can be used to determine the land characteristic factors affecting the agricultural land-use potential and quantify the relationship between land characteristic factors and plant productivity in order to improve land evaluation methods that support the foundation of land use planning. Regression decision tree model in this study includes two kinds of variables. The target variable is the productivity (t/ha) and the predictor variables consist of soil types, soil depth, slope, irrigation and texture. The analytical result of survey data shows several factor combinations according to plant average productivity. Based on productivity can evaluate the adaptation level for each correlative factor combination. This study is applied for rubber trees and conducted in Phu Giao district, Binh Duong province. The study shows that the interpretation level of the predictive variables is 96.49%. The area of highly suitable (S1) is 474.67 hectares, suitable (S2) is 53,597.70 hectares. This result is different from the Analytic Hierarchy Process (AHP) method.

Damage situation of the cabbage webworm (Hellula undalis) on green mustards at Mekong Delta had been studied by farmer interview and field investigation at Vinh Long, Can Tho and Hau Giang province from February 2016 to March 2017. The results of interview with 180 households showed that H. undalis damaged 9 green mustards cultivars (Brassicaceae) which farmers are cultivating, especially heavy at the stage 10-15 DAP (days after planting) and in dry season heavily. Up to 48.9% of total interviewed households did less known about H. undalis, 17.2% not know and 33.9% know clearly the morphological characteristics, times and seasons it damaged. In 25 field investigation, the damage of H. undalis was popularity (++, 25-50%) with the frequency 5/5 times of green mustards season. Brassica campestris, Nasturtium officinale, B. juncea and B.  integrifolia were damaged by H. undalis with the highest percentage of 7 green mustards cultivars.

A field experiment was conducted to evaluate biological nitrogen fixation ability of the bio-product from nitrogen-fixing bacteria Burkholderia vietnamiensis BV3 (stored in 3 months) on high-yielding rice (cv. OM6976) cultivated on alluvial soil of Hon Dat district, Kien Giang province in Summer-Autumn cropping-season 2016. The experiment was arranged into randomized complete block design (RCBD) with four replicates. The results showed that bio-product saves 50% amount of chemical nitrogen (equivalent of 50% amount of biological nitrogen fixation) for the growth and grain yield of rice in the field condition.

Many studies show that abuse of insecticide in cultivation affect negatively on plant and can cause mutations in organisms (including human) that indirect contact indirectly with insecticide. This study is to investigate cytotoxic and genotoxic effects of a commercial insectiside (Regent 800WG) on root tip of Allium fistulosum L.. Two concentrations of fipronil (0.005% and 0.008%) were used for different periods of time (4 h, 8 h and 24 h). The tested concentrations decreased the mitosis index compared to the control. The result indicated that the different treatments caused diverse types of chromosome abnormalities during mitosis. The chromosome abnormalities were stickiness, disturbance in metaphase, chromosome bridges in anaphase, micronuclei appearing in interphase cells. In addition, there were many abnormal cells after onion roots were treated with 0.005% and 0.008% fipronil.

The purposes of this research were to evaluate the effects of different soil salinity levels to the performance and correlations between agro-biological traits of some salt-tolerant rice cultivars. Two experiments were conducted on saline soils with two different salinity levels of medium (6.35 dS/m) and high (9.90 dS/m), in the winter-spring of 2017, at Thua Thien Hue province. 10 different salt-tolerant rice cultivars were used in the experiment. Agro-biological traits such as plant height, yields, and yield’s components were studied. The results showed that the growth, yields, and yield’s components of the salt-tolerant rice cultivars were poor, especially at the high soil salinity level of 9.90 dS/m. Yields per plant decreased by 14.8% as salinity increased to 3.55 units (from 6.35 dS/m to 9.90 dS/m). To increase the yield per plant at the medium soil salinity level of 6.35 dS/m, the best approach is to find out solutions to increase plant height, total panicle, panicle’s weight and dry biomass of plants. However, at high soil salinity level of 9.90 dS/m, in order to increase the yields per plant, it needs to find out solutions to increase the traits of panicle’s weight, total seeds/panicle, full-seeds/panicle and total dry biomass of plants.

The study was conducted by interviewing 123 farmers of improved extensive shrimp and 141 farmers of rotation shrimp-rice in the four clusters in two areas affected by saline water from East sea and Thailand gult in Thoi Binh district, Ca Mau province. The object of study was to determine technical and financial parameters affecting to the productivity and cost-benefit of these shrimp culture systems to recommend the solutions for improving the benefit of shrimp farmers. The results showed that the improved extensive system had an average stocking density about 9.29±3.78 shrimp/m2/year(time of stocking as 4,02±1,19 times/year ) with the average shrimp yield was 558.40±113.01 kg/ha/year and the net income of VND 93.81±21.02 million/ha/year. The rice – shrimp system, with the average stocking density about 5.39±2.38 shrimp/m2 annually (time of stocking as 3,36±0,96 times/year) stocking density and reached an average yield of 491.90±156.99 kg/ha/year and average of VND 95.41±29.01 million/ha/year net income. In the improved extensive and rice – shrimp systems, shrimp stocking density, number of stocking times, applying hapa to nursing post-larva and the percentage of aquatic weed area affected the shrimp yield and net income of farmers; additionally, in the rice – shrimp system the stocking Macrobrachium rosenbergii in the rainy season improved significantly the shrimp yield and net income of farmers. Improved extensive shrimp system had higher net income and has been developed in the adjacent areas to the coastal areas to replace the rice – shrimp areas, meanwhile the rice – shrimp system has been shifted toward inland areas due to salinity intrusion.

Water quality in Binh Thien lagoon, An Giang province, was studied to evaluate the fluctuation of physico-chemical parameters, and obtained results may serve as baseline information for lagoon management, specifically for the sustainable management of fisheries and aquaculture. The study was carried through twelve times of water sampling for temperature, depth, pH, TSS, NO2-,DO , COD, BOD, TAN, P-PO43- and coliform.  analyses at 30-day intervals from January to December 2016. The water samples were collected along a transect including in front, middle and back of the lagoon, and both of surface and bottom sites (50cm in depth and 50cm above the bottom, respectively). Results revealed that water quality parameters in Binh Thien lagoon varied on both temporal and spatial scales, parameters in this study were under the Vietnam national standard of surface water (QCVN 08-MT:2015/BTNMT) except an over case of COD in the dry season. Besides, coliform in the dry season was more abundant than in the wet season, it means that Binh Thien lagoon is being received large waste water from local community in the region.

The study is aimed to investigate the quality change of the snakehead fillet under ice storage in combination with acetic acid treatment. The two treatments were (1) soaking snakehead fillet in cold water (control treatment) and (2) soaking snakehead fillet in cold water with 0.05% acid acetic addition. In the treatment (1), 25 fillets (80-90 g) were soaked in ice cold water for 10 min, dried for 10 min then placed into PE bags (5 fillets in each bag) and stored in the insulated box with ice at the fish:ice ratio of 1:1. In the treatment (2), 25 fillets were soaked in acid acetic solution 0.05% under ice cold water for 10 min, dried for 10 min then packed in bag and placed in insulated box in the same way as treatment (1). Sampling was done at day 0, 3, 6, 9, and 12 of storage. Evaluated parameters included temperature, total aerobic bacteria count, sensory property, structure, water holding capacity, pH, total volatile base nitrogen, peroxide value and TBARs. Results showed that fish fillet treated with acid acetic 0.05% presented the significant higher sensory property during storage. Fish fillet can be stored for 12 days in both treatments. After 12 days of storage, fish fillet remained high quality and safety but significant lower total aerobic bacteria count was found in fish treated with acid acetic 0.05%.

The study is aimed to determine the appropriate water level, stocking density, and emerged substrate for the development of crab larva from megalop stage to crab 1. The study included two experiments: (1) investigation of different water levels (20, 40 and 60 cm) in combination with stocking density (5000, 10000 and 15000 individuals/m2) on survival of crab and (2) investigation of amount of emerged substrate (0, 2, 4 and 6 m2 substrate area/m2 of floor area) following the best water level and stocking density (the best results from experiment 1). Both two experiments were set up in the tanks (0.1 m2). Water salinity was 26 ‰. Initial megalop size was from 2.08 to 2.10 mm. After 7 days of nursery, there was no interaction between the water level and stocking density on the survival rate of crab (p = 0.226). However, the survival rate of crab at the water level of 40 (76.9%) and 60 cm (75%) were significantly higher and that of water level of 20 cm. At stocking density of 5,000induviduals/m2, survival rate reached 85.6% and it was significantly higher than those of other stocking densities. In the second experiment, the highest survival rate of crab (79.9%) was found in treatment applied 6 m2 of substrate per 1 m2 floor. However, there was no significant difference between the treatments. Results showed that at stocking density of 5,000 individuals/m2, the water level of 40 cm and 2 m2 substrate area/m2 of floor area are the best conditions for nursery megalop to crab 1.

This study was carried out to identify pathological characteristics of Streptococcus iniae which were isolated from cage cultural barramundi (Lates calcarifer) in Thua Thien Hue. As a result, 27 isolates were isolated from 50 barramundi samples which displayed hemorrhagic disease and identified as S. iniae by using biochemical tests. The bacterial isolates were cocci-shaped, Gram-positive, catalase and oxidase negative, non-motile, positive for hydrolysis of starch, hydrolysis of esculin and negative for hydrolysis of hippurate. Results of slide agglutination test by using Slidex Strepto Plus revealed no reaction with A, B, C, D, F, G serotypes of Lancefield group. Two S. iniae strains (HTA1 and HTA3) were selected for pathogenicity test and determination the LD50. The LD50 value of the two S. iniae isolates HTA1 and HTA3 in healthy barramundi were 1.9x105 CFU/mL and 1.5x105 CFU/mL, respectively. After 48 hours injection challenge, infected fish showed clinical signs such as lethargic, hemorrhage on the skin and base of fins, protruding and hemorrhage eyes. Mortality started at 72 hours post challenge and the cumulative mortality of fish infected with HTA1 and HTA3 strains at day 8 post challenge was the highest (76,7% and 80%, respectively). Whereas, in the control group, uninfected fish showed no clinical sign, no death, and no S. iniae were found.

This study was conducted to evaluate the effects of different protein contents in diet on the growth and survival rate of black apple snail (Pila polita). There were 3 replicates in each treatment and snails were fed with protein levels at 15 (P15); 20 (P20); 25 (P25); 30 (P30); 35 (P35) and 40% (P40). Newly hatched snails with initial shell height and weight of 4.88 mm and 0.03g were reared in the composite tanks (80×60 cm, water column of 20 cm) with the density of 150 ind./tank. After 49 days of rearing period, the average weight and height of the snail at P25 (1.17 g and 17.3 mm) were higher (p0.05). Snails in P25 obtained the highest yield (349 g/m2) and it was significantly different (p

The study was conducted to investigate the variability of parameter in water with different stages as well as to determine the effect of high CO2 on the acid-base regulation of the eel. The field survey was measuring CO2 levels in 9 swamp eel grow-out tanks. The results showed that the partials pressure of CO2 in water was 9.5 mmHg and 28 mmHg in the middle and harvest of culture cycle (9 months), respectively. The laboratory experiment was conducted with 3 treatments including control, 14 and 30 mmHg CO2. Blood was sampled at 0, 3, 6, 24, 48, and 72-h.  Blood pH decreased during the first 24-h and completely recovered after 72-h with value of 7.4±0.04 at the treatment of 14 mmHg CO2. In contrast, partial pressure of CO2 in the blood and plasma HCO3- increased significantly at the treatments of 14 and 30 mmHg CO2 during hypercapnic exposure compared to the control group (p

Nowadays, lecturers at the Center for National Defense and Security Education of Can Tho University are applying a variety of teaching methods to improve teaching quality in National Defense and Security Education. Some methods, however, seem inappropriate. Therefore, a survey on the current status of teaching and learning this subject National Defense and security Education at the Center. From that situation and the number of those causes, this study will introduce some solutions to improve and innovate the quality of teaching.

Nowadays, applications of science and technology into teaching, research and production in the real - life are new trends. Used in entrance exams of sport aptitude for physical education at Can Tho university have been mainly hand-crafted intruments. This does not guarantee the objectiviness and fairness to candidates. Wishing to create better (accurate, objective, low-cost) devices for determining contestants’achievement, the kit Raspberry Pi 3 installed with WinIoT software and Visual Studio, SRF05 optical sensor, 315 MHz RF Transceiver Module and optical sensor design components were used. As the result, three products were designed and produced, including a time meter in running 1-4 lines, a distance meter in broad jump and A distance meter for flexing.

Globalization has been creating the tendency of international integration in all fields of social life. International integration creates opportunities for development but also contains many challenges, including the challenge of preserving and promoting the cultural identity of the people. How to educate students to consciously preserve and promote local cultural heritage values ​​in the process of economic development during the period of international integration, this is an issue that needs to be researched to have the right orientation for the path of development of the nation. The article “Integrating Education awareness of preserving the cultural heritage of the local into history of Vietnam teaching in high schools in Can Tho City”, recognize the purport of cultural heritage in teaching history in highschools, therefrom offer more solutions to voluntarity protect cultural heritage in Can Tho, contributing to improve the quality of teaching subject now.

Geo-politics plays an increasingly important role in international relations as well as the foreign policy of each nation. US is one of the world’s most powerful countries which appriciates geo-political factor in planning and implementing their foreign policy. In the 21st century, Asia-Pacific has become the essential area where many powerful countries set up their strategic interests. In this area, Southeast Asia is considered the strategic area in foreign policy of many countries, including America. The focus of this paper is to analyze the geo-political roles of the Southeast Asia to US security and counter-terrorism policies, trade relations, and implementing its soft power.

“Truyen ki man luc” is the culminant work of the genre “truyen ki” in Vietnamese literature. If this work is shone by Sigmund Freud’s theory of personal unconsciousness, many more diverse perspectives of this literary work will reveal. "Truyen ki man luc" expresses the dream of people, especially sexual instinct. "Truyen ki man luc" also shows the life instinct and the death instinct. “Truyen ki man luc", which depicts the personal unconsciousness, reveals human’s psychological depth, contains humanistic values and raises the sympathy from readers.

Chau Doc province was established according to the decree of the Governor of Indochina - Paul Doumer on December 20th, 1899. The natural conditions and society in Chau Doc were very distinct and complex. In consequence, the reclaiming situation, land ownership, and agricultural activity fluctuated constantly from different angles such as cultivated area, productivity, labor, the number of cattle, rice export and so on. The focus of this paper is on analyzing and evaluating such situations and roles of agricultural economy of Chau Doc in the southwest region during the first half of the 20th century

This essay will elaborate prominent characteristics of the Chinatown novel. With the ambivalence in post-colonialism theory, Thuan completely analyzes the conflicting feelings of people living in the exile, their hometown or even in their family. Apart from that trend,. “stream of consciousness” build and renew characters of this novel. Moreover it is evident from provided resource that Thuan has got success in innovation regarding novel art.