Since its inception until now, TV communication has been an indispensable part of life. The quality of life is increasingly improved, the entertainments for life also comes along. In addition to increasing image quality, the image reflected on the conveyed content is also an important part. That is the device that supports the camera to help create flexible, sweeping image angles, without real shaking the content passed to the viewer. That supporting device mentioned in this paper is the camera control system for moving on ray. This system was previously adopted as a rudimentary system with two manual operators and took up a lot of space within the studio and was very passive. It is improved with intelligent control system to help the camera move as desired and especially stable, the image does not shake when the camera is pan, tilt and move. The automatic control function for stable system operation is applied by a proportional integral derivative (PID) controller. The simulation results on MATLAB® are presented and the test results on the actual model for this system meet the set goals.

This study aimed to synthesize and characterize Fe3O4@SiO2 nanoparticles with a core-shell structure functionalized with chitosan. Fe3O4 nano particles were firstly synthesized by the co-precipitation method and then covered with SiO2 by using a silane compound derived from tetraethyl orthosilicate (TEOs) used as a reagent for phase transition with an advantage of high bioadaptability with silica dioxide shell. The nanoparticles covered with silica dioxide were funtionalized with chitosan, a polymer with bioadaptable characteristics highly applied for biomedical. The result of X-ray analysis of nanoparticles Fe3O4 showed a high crystalline structure and the result of particle morphology using a vibrating sample magnetometer and transmission electron microscope (TEM) analysis presented that the particles were in the shape of octahedral nanoparticles and the particle size including SiO2 shell was about 20 nm. Fourier transform infrared spectroscopy of Fe3O4@SiO2/CTS showed that the apperance of peaks of C–O, N–H, C–H bonding illustrated the presence of chitosan on the surface of Fe3O4@SiO2 after the functionalizing step. The result of a vibrating sample magnetometer determined super-paramegnetic properties of the as-synthesized material and the saturation magnetization value (Ms) of Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2/CTS was 92.64 emu/g, 56.97 emu/g, 52.43 emu/g, respectively.

The Mekong Delta, often referred to as “Vietnam’s Rice Bowl”, is the biggest rice producing region in Vietnam with the majority of its land area used for cultivating paddy rice. However, the intensification of rice cultivation over many years has produced more pests and diseases. The research is conducted to monitor and support early warning of rice pests and diseases using unmanned aerial vehicle (UAV) technology. The researcher did analyze the relationship between the level of pest infestation and the values of Normalized Difference Vegetation Index (NDVI), Normalized Difference Red Edge Index (NDRE - Normalized Difference Red Edge Index), and field survey data. The results show that there are 4 levels of pest infestations: heavy, medium, light and no pest infection with a total infected area of ​​11.37 ha, in which heavy infection is 2.1 ha, medium infection is 2.76 ha, light infection is 6.51ha and no infection accounts for 12.33 ha. It shows that there is potential to apply UAV technology in monitoring rice pests and diseases, which contributes to improve the efficiency of rice production in Soc Trang province in particular and in the Mekong River Delta in general.

The paper aims to provide status information seawater quality, sediment through two years surveys (2017-2018) at 24 sampling points in Nam Du Islands. Research results showed that relatively low concentration of parameter nutrients (NO2-, NO3-, NH4+, PO43-) has been found at the monitoring stations, and RQtt index were calculated at the level of environmental safety. Cyanide (CN-) in seawater ranged from 0.96 đến 2.01 µg/L while the heavy metals content (Cd, As, Pb) ranged from trace to 0.09 µg/L; from 2.5 to 3.8 µg/L; from 0.28 to 1.78 µg/L, respectively. In general, these measured values were lower than standard values of QCVN 10-MT:2015/BTNMT. Nts and Pts in sediment surface ranged from 39.2 to 367.6 mg/kg; from 5.7 to 39.4 mg/kg. Organic carbon ranged from 0.29 to 1.05 %. This study could serve for conserving and developing macroalgae source in Nam Du islands.

The main aim of this paper is to study the unfair game model. It is described by a random walk in one dimension. In this model, there exists a law of large number and the random walk converges in probability to a constant. All results are here proved by the method of moment which was introduced in (Billingsley, 1995).

Cancer treatment drugs are currently in the interest of researchers and the enzyme histone deacetylase (HDAC) is considered a most important molecular target. In 2014, belinostat (Beleodaq) was approved by the FDA as a potent inhibitor of HDAC. Belinostat has been proved to be a cure/treatment for solid tumours and haematological malignancies in clinical trials. Based on the strong activity of belinostat, two belinostat analogues were successfully synthesizedthrough a Wittig reaction with the aim of creating new derivatives that have the potential to selectively inhibit HDAC to contribute to cancer treatment. By keeping the carbon bridge part and the hydroxamic function group intact, the phenyl frame of belinostat is replaced with amine derivatives bearing different R substituents. The derivatives were considered for HDAC8 inhibition based on the in silico method.

The aim of this paper is to study a fair game model, which is described by a random walk in one dimension. The method of moments, as in Depauw and Derrien (2009) and Lam (2014), is applied to prove that this process converges in distribution to a normal law. Especially, the moment of a random walk will be computed in details. This is an extension of Lâm Hoàng Chương and Dương Thị Bé Ba (2017).

This study is aimed at synthesizing five Wells-Dawson polyoxometalates (WD-POMs) including α-K6P2W18O62·14H2O and b-K6P2W18O62·19H2O (P2W18), K10[α2-P2W17O61]·20H2O (P2W17), α2‐K8P2W17O61(Co(II)∙H2O)∙16H2O (CoWD 1:1), α2‐K8P2W17O61(Ni(II)∙H2O)∙17H2O (NiWD 1:1) and α2‐K8P2W17O61(Cu(II)∙H2O)∙16H2O (CuWD 1:1) to investigate their antifungal activity toward three strains of fungi Fusarium oxysporum, Pyricularia oryzae and Colletotrichum species and the antibacterial activity toward two strains of bacteria Aeromonas hydrophila and Vibrio parahaemolyticus. Among these WD-POMs, P2W18 exhibited the highest antifungal activity toward all studied strains of fungi. The minimum inhibitory concentrations (MIC) of P2W18 toward F. oxysporum, P. oryzae and Colletotrichum sp. were 1.0 mM, 3.0 mM and 1.5 mM, respectively. The study also proved that among these WD-POMs, P2W18 showed the best antibacterial activity with MIC = 0.375 mM toward both A.  hydrophila and V. parahaemolyticus.

Stomach ulcers are a common gastrointestinal disease and there have been many studies and strategies to prevent this disease. Many studies have been done subclinical and clinical to find preventive drugs, but the animal model of stomach ulcers has not been agreed. This study was performed to evaluate 3 models of acute gastric ulcer in Mus musculus by ethanol (60°, 70° and 80°), acetic acid (10%, 15% and 20%) and aspirin (350 mg/kg, 500 mg/kg and 650 mg/kg) with the evaluation criteria of total acidity, ulcer index by depth, length and area of ​​the ulcer. The results showed that all 3 ulcer agents could cause stomach ulcers, in which 70° ethanol, 10% acetic acid and 500 mg/kg Aspirin were suitable agents to make stomach ulcer mice models.

Sweet bush (Sauropus androgynus (L.) Merr.) being a precious vegetable that is used not only for medicinal purposes but also for eating everyday as vegetable. Although this crop is widely cultivated in the Mekong Delta, the study of genetics systematically is not considered well. The objective of this study was to evaluate the genetic characteristics of some samples/varieties collected in eight provinces in the Mekong Delta based on morphology and SNP marker for ITS region. The results showed that there are different phenotypes among the samples of variety due to different environmental and cultivated conditions. For genotypes, all samples of variety belong to the species Sauropus androgynous (L.) Merr. as compared ITS sequences with sequences on NCBI. Phylogentic tree showed that four samples origined from Chau Thanh (Soc Trang), Can Tho, Ca Mau, and Kien Giang differ from the other groups; two samples from Vinh Long, and Thuan Hung (Soc Trang) are similar to the ITS sequence so they belong to same group, meanwhile Hau Giang and Dong Thap samples are close together, genetically.

In this study, one-row watercress (Nasturtium microphyllum) ethanol (70% and 96%) extracts were determined the total phenolic content (by Folin-Ciocalteau method), flavonoid contents (using aluminium chloride colorimetric method) and evaluated for antioxidant activity estimated by DPPH (2,2‐diphenyl‐1‐picryl‐hydrazyl‐hydrate). The total phenolic content obtained ranged from 2.72 ± 0.28 to 6.01 ± 0.177 mg/g GA fresh weight, and the total flavonoids contents resulted from 1.99 ± 0.307 to 3.33 ± 0.049 mg/g fresh weight in these ethanol (70%, 96%) extracts. The IC50 values for scavenging of free radicals were from 493.40 ± 0.007 to 960.83 ± 0.006 μg/mL. Moreover, by using Sulforhodamin B method, at 500 μg/mL concentration, all of one-row watercress ethanol extracts have ability to cytotoxic the breast cancer cell line MCF-7 but relatively low (fresh one-row watercress ethanol 96%  extract has the best cytotoxicity with a toxic percentage is 32.44%). At 2,000 μg/mL dry one-row watercress ethanol 96% extract inhibit 17.52% the α-glucosidase in vitro.

This study is aimed at isolating and selecting plant growth promoting bacteria associated with plant’s leaves. Ammonium Mineral Salt (AMS) was used as a selective medium for bacterial isolation. The seed germination rate, root length, shoot lenght and number of roots were collected to evaluate the effect of bacterial isolates on the growth of maize seeds. The results showed that a total of 28 bacterial strains were isolated from 6 different plant’s leaves including Basella rubra L., Rosa chinensis Jacq., Ruellia brittoniana, Arachis pintoi, Ardisia quinquegona Blume, and Coccinia grandis (L) Voigt with a very high diversity in colonical and cell morphologies. Two strains of bacteria denoted as HH5 and MT6 stimulated significantly the seed germination rate and growth of maize as compared to the control treatment (no bacterial inoculation). Additionally, the study also showed that the seed germination rate and growth of maize of treatments inoculated with a bacterial concentration of 106 CFU.mL-1 of these two selected strains were significantly higher than that of the control treatment. Based on 16S-rRNA gene sequences, these two bacterial strains, HH5 and MT6, had a very close genetical relationship with Curtobacterium citreum and Curtobacterium luteum, respectively.

This study is conducted to evaluate the feasibility of the rice-fish-fruit integrated systems, the reduction of toxic pesticides use, the increasing income and producing of rice and fish VietGAPs. The experiment of rice-fish-fruit integrated systems was carried out in 3 farmer’s fields to compared with mono rice farming systems at An Giang province. By applying the intercropping of 2 rice crops - 1 fish crop, the rice and fish products were achieved VietGAP standards and certified. The toxic pesticides used for rice production in the rice-fish-fruit systems were lower than that for mono rice systems, at 28% and 39% respectively. Due to the additional income from fruit and higher net return from rice, the total returns and net incomes of the rice-fish-fruit systems tended to be higher than those of mono rice systems, 53% and 209% respectively. The fish production in this study did not bring extra profit due to low survival rate of some fish species and low market price of pangasius catfish. For further improvement of the profitability and profit margin of the rice-fish-fruit systems, it is proposed that the research should focus on increasing the market price of VietGAP rice and fish products as well as improving fish yield.

The objective of this study was to determine the proper concentration of spraying naphthalene acetic acid (NAA) to obtain the highest growth and yield of black sesame (Sesamum indicum L.). A field experiment was conducted in a randomized complete block design with six treatments and five replications in O Mon district, Can Tho city. Treatments included (i) control (no spraying NAA, spraying tap water), (ii) spraying NAA at concentration of 25 ppm, (iii) spraying NAA at concentration of 50 ppm, (iv) spraying NAA at concentration of 75 ppm, (v) spraying NAA at concentration of 100 ppm and (vi) spraying NAA at concentration of 150 ppm. The results showed that spraying NAA at concentration of 50 ppm contributed to increase the number of leaves per plant, content of chlorophyll a, content of chlorophyll total, percentage of fulfil capsule, concentration of N, P in leaves, number of capsules per plant, dry biomass and grain yield of black sesame.

Knowing the environment that is unfavorable for the growth of pathogens can be used as basic information to develop appropriate strategies to prevent the occurrence of disease in dragon fruit. In this paper, a number of environmental factors including temperature, pH and salinity, as well as biological factors including endogenous bacteria species isolated from pitaya showing antagonistic activity on  fungi, Alternaria alternata was studied. The growth of A. alternata mycelium is inhibited at 35°C, while 25°C is quite suitable for their growth. The temperature of 30°C is favorable for the development of A. alternata. Under different pH conditions, the growth of A. alternata is most inhibited at pH 4. Moreover, the salinity test results show that A. alternata is not significantly affected by salt concentrations tested. Meanwhile, in vitro testing of antagonistic bacteria showed that both EC120 and EC121 were highly effective in inhibiting the growth of the fungus under investigation. The results of the experiment show that the proper combination of environmental regulation and care regimen can be very beneficial for crop growth in the field as well as the longevity of fruit after harvest.

In order to create seedlings with a perfect developed root system by the cultured embryo sap coconut micropropagation, 5 experiments of the research were carried out basic on the factors affecting the rooting rate of embryo sap coconut. The results determined that at the root stage, the modified  Y3 medium was supplemented with sucrose 40 g/L and agar 5g/L was more suitable than others. All germinating embryos had root length less than 5 cm after 4-month culture, they were transplanted to the modified Y3 medium + IAA 3 mg/L was best results. For non-submerged embryos (the root out of the medium), two methods were carried out: adding modified Y3 medium supplemented with NAA 3 mg/L or root cutting + modified Y3 medium + NAA 3 mg/L. However, the method of cutting roots takes more time for the tree to qualify. It is recommended to apply the results of this research for embryo cultured Sap coconut seedling production in Vietnam.

The study was conducted with two experiments to assess the effect of feeding ration of Chlorella sp. and the effect of replacement of Chlorella sp. with baker’s yeast on the population growth of Brachionus calyciflorus as follows: experiment 1 consisted five treatments, rotifers fed with microalgae increased a cumulative 20,000 cells/rotifer/day per treatment derived from 60,000 cells/rotifer/day. Based on the results of experiment 1, the suitable microalgae feeding ration with good results on rotifer population growth was selected for the next experimental setup. Experiment 2 was arranged with microalgae ration replaced by Baker’s yeast, the substitutes increased by 25% from second treatment to last one corresponding to the reduction of microalgae, each treatment with 3 replications. Rotifer was stocked at an initial density of 200 rotifers/mL. The results showed that the highest density of rotifers was 688 rotifers/mL on day 4 at the treatment of 80.000 cells/ rotifer/day, and reached 898 rotifer/mL at treatments of 75% Chlorella+ 25% Baker’s yeast after 5 days of rearing. The results indicated that replacing 25% of algae with Baker’s yeast improved the density of B. calyciflorus.

The present study aims to determine the feeding habits and growth characteristics of spotted scat Scatophagus argus in Tam Giang lagoon of Thua Thien Hue province. A total of 180 specimens were randomly collected from 7/2018 to 6/2019 and divided into three groups based on the length of fish including: 14,0 cm. The results show that the feeds and feeding habits of spotted scat were different among fish sizes. The stomach content analysis showed a wide variety of foods during their young stage and prefer to consume more plants in the later stage of their development. The group of 8,5–14 cm in length had the highest the fullness of gut, followed by groups 14 cm. Analysis of the stomach contents revealed that spotted scat is omnivorous fish, feeding mainly 6 different prey items (e.g., bacillariophyta, chlorophyta, cyanophyta, rhodophyta, zooplankton, zoobenthic, and organic matter). Among these food items, bacillariophyta is abundant in the number of species. The analysis of the length-weight relationship showed that a intercept was 0.062 whiles exponent b was equal to 2,75 with a correlation coefficient R2 = 0,9686. The value of b was below 3 indicates a negative allometric growth pattern of Scatophagus argus that explains the increment of weight does not in proportionate to its length increment. Condition factor (K) varied from 2,97 to 3,37 reveal the stability of the environment and natural foods for fish in Tam Giang lagoon.

The study is aimed to evaluate the effect of supplementation of sugar at different stages on growth and survival of giant freshwater prawn of larvae and postlarvae applied biofloc technology. The experiment included four treatments of sugar supplement from different stages of larvae (2nd, 4th, 6th, 8th), each treatment was triplicated, stocking density was 60 ind/liter and water salinity was 12‰, the experimental tank was 0.5 m3 in volume. The results showed that the metamorphism index of the larvae after 21 days of incubation (10.70±0.10), the length of the postlarvae 15 (11.4±0.1 mm) of the treatment with sugar supplement at stage 4 were significantly different (p0.05) compared with the treatment of adding sugar from stage 6, but the difference was statistically significant (p

The study was aimed to evaluate effects of broodstock origin and offspring’s initial size on the growth and survival rates of bighead catfish (Clarias macrocephalus) fingerlings to provide information for a breeding program of the species. Three treatments of fingerlings were produced from three sources, including wild broodstock in Ca Mau and Hau Giang, and cultured fish in Can Tho. Fish was cultured in 500 L- tanks of a recirculating system and fed with commercial pellet (containing 40% protein). Each fish source was divided into two initial sizes and designed into four replicates, except three replicates for Can Tho source. After two months, weights of fish ranged 5.70-10.20 g and specific growth rates of fish were 4.94-5.28%/day. Can Tho fingerlings had the highest growth rates. However, differences in growth parameters were not significant among three broodstock sources and were not affected by the interaction between broodstock sources and the initial sizes (P>0.05). Feed conversion ratios (FCR) ranged from 0.85 (Can Tho) to 1.57 (Hau Giang). Survival rate of Can Tho fingerlings was highest (57.3%) and Hau Giang was lowest (25.5%). Broodstock sources and the initial sizes did not significantly affect FCR and survival rates. Generally, the offspring of bighead catfish from Can Tho source had better performance of growth and survival compared to fish from the two wild sources.

The study aimed to assess the status and benefits of farmers participated in Tan Hung agricultural cooperative high yield shrimp production regarding to technical and financial aspects by interviewing 30 cooperative members in Cai Nuoc district, Ca Mau province. Data collected involved technical situation and benefits of farmer being member of the cooperative. The result indicated the average yield and profit of the farm were 3.97 tons/1,000 m2/crop and 137 million VND /1,000 m2/crop respectively. Profit margin of shrimp farming was approximately 0.42 and economic lost household ratio was 23.3%. The farmers participating in the cooperative achieved economic and association benefits significantly. With regard to economic aspect, being member of cooperative result in revenue and profit improving due to increasing productivity, reducing production costs, and stable selling price. The association aspect bring several benefit to members including inputs and services concession, accessing technical support, output’s quality improvement, build up association, and information and experiments sharing. The difficulties of cooperative included capital shortage, product consumption, the limitation of cooperative leaders’ management capacity, small scale production, and lack of belief between stakeholders.

This study is aimed to determine the appropriate rearing protocol for growth, metamorphosis and survival rate of mud crab larvae (Scylla paramamosain). The experiment consisted of three treatments: (1) using of chemicals; (2) Ozone disinfection; (3) using of antibiotics. Mud crab larvae were stocked in 1.6 m3 tanks at 200 ind./L of density and 30 ‰ of salinity. The results showed that total bacteria count, Vibrio count, and parasitic prevalence in ozone disinfection treatment were 0.86 x 104 cfu/mL, 0.16 x 104 cfu/mL and 6.40%, respectively; and were significantly lower compared to others (p

This study is aimed to investigate and evaluate the current status of academic advising in engineering programs at College of Engineering Technology – Can Tho University. The analysis results are based on the feedbacks of 66 lecturers who are performing the task of academic advisors in 119 speciallized classes of training programs in engineering sector. The analyzed contents are focused on qualities and criteria of academic advisor or counselor, the current state of academic advising activities, the advantages, and disadvantages that can affect academic advising activities. Then, some suggestions are made to improve and to strengthen the academic advising in the coming years.

This study provides information regarding the status quo, reasons, and solutions of applying lesson study (LS) into professional team meeting (PTM) and scientific research of education (SRE) among high-school teachers (HST) working in some schools in Can Tho City. The survey results, together with qualitative and quantitative analyses, applied to 431 HSTs indicate that LS has been implemented for more than 6 years, but the HSTs still have not got an adequate body of knowledge about LS, particularly its significance. Applying LS into the PTMs has not been conducted properly with regard to the essential principles from training, lesson planning, class participating, observing, and feedback. Some PTMs were not satisfied with the training about the format and content of LS theories as they expected much more profound knowledge, more practice, and more real-life experiences. Besides, the survey results showed that the LS activities, especially the SRE of the HSTs, were quite weak. Approximately 62.41% of the HSTs have never done any SRE; otherwise, they merely offered some experience initiatives. Therefore, LS should be more proper training conducted by experts from the universities for HSTs.

Duong xa poems is a part of Nguyen Duy Poetry Collection, a collection of poems composed when poet Nguyen Duy went abroad, mainly in the 80s - 90s of the twentieth century. These poems have recorded new things that the poet Nguyen Duy observes and discovers on new lands, at the same time, conceals indelible impressions, creating unexpected, interesting associations and motivating deep thoughts. Nguyen Duy's Poetry of Duong xa, therefore, both expresses an open mind, a spirit of international integration, and a deep introverted spirit, a spirit full of responsibility towards the nation.

This paper presented results on the production of mushroom in the Mekong Delta focusing on analysis of production efficiency including economic efficiency and financial efficiency. There were 115 mushroom farmers randomly selected in the survey. Descriptive statistical analysis methods and regression analysis were used in this study. The results indicated that the average profit per roll of straw was 16.6 thousand VND/roll (average profit for 1 kg of fresh mushroom was 14.7 thousand VND /kg). In terms of financial efficiency, the average profit was nearly 23 million VND/crop/ household, equivalent to a profit rate of 37.5%; in terms of economic efficiency, gross margin was 34.4% and profit margin is 17%. The results showed that statistically significantly, the input factors that affected the yield of mushroom were quantity of paddy straw, seeds, cost of pesticides, the amount of hired labor and own labour.  The results showed that, statistically, respondents' gender, number of mushroom crops per year, type of straw, number of straws, number of houseworkers (watering), area of ​​mushroom cultivation were factors influencing economic productivity.