Valuation methods and implictions in Vietnam's equitization process

Thesis(Master) --KDI School:Master of Public Policy,2001masterpublishedby Lien Thi Thu Nguyen

Osteogenesis activity of fractions extracted from Clinacanthus nutans (Burm. F.) Lindau

Osteogenesis activity of fractions extracted from Clinacanthus nutans was evaluated on an in vitro model using osteoblast MC3T3-E1 cells. The results showed that all fractions, including ethanol (EtOH), n-hexane, ethyl acetate (EtOAc) and butanol (BuOH) were not significantly toxic to the osteoblast cells at the test concentrations of 5, 10, 25, and 50 µg/mL. The EtOH and EtOAc fractions exhibited the highest osteogenesis activity in terms of enhancement of alkaline phosphatase (ALP) and mineralization activity of MC3T3-E1 cells, especially the EtOAc fraction which increased ALP activity up to 30% and mineralization activity up to 100%. Thus, the EtOAc fraction shows osteogenesis activity through stimulating activites of the two markers for bone generation including ALP and mineralization in osteoblast cells. The fraction is now under extensive investigation to isolate and fully understand the modes of action of the active compounds. 

Analyze the Determinants of Capital Structure for Vietnamese Real Estate Listed Companies

This study adopts a two - step system general method of moments (GMM) approach towards investigating the determinants of capital structure for the listed real estate firms on Ho Chi Minh stock exchange (HSX) in Viet Nam from 2010 to 2015. The determinants of capital structure are mixed and different for short-term and long-term indicators. The real estate firms tend to use more debts to finance their investment. Vietnamese real estate firms should focus on balance structure debt due to complicated impacts of the determinants to their capital structure. There are some implications for the real estate companies and policy of the Government that are based on the empirical results. Keywords: determinants of capital structure, real estate company, general method of moments. JEL Classifications: G32, R

Development of a diagnostic scar marker for Vibrio shilonii caused acute hepatopancreatic necrosis disease in whiteleg shrimp

Background: In a previous report, we showed that Vibrio shilonii was found on whiteleg shrimp (Litopenaeus vannamei) with acute hepatopancreatic necrosis disease in Thua Thien Hue province, Vietnam. This study was performed to develop a diagnostic molecular marker generated by random amplified polymorphic DNA (RAPD) for V. shilonii rapid detection.Methods: Pathogen Vibrio spp. were isolated from shrimps and fishes, and were identified by 16S rRNA sequencing. Genetic diversity of Vibrio strains was analysis by RAPD technique. Specific PCR product for V. shilonii was cloned and sequenced. SCAR marker was developed from specific PCR product.Result: Twenty random primers were evaluated for RAPD to identify DNA polymorphisms between Vibrio species. The random primer OPN-06 generated a 468-bp DNA fragment specific for V. shilonii. This was then converted into a sequence-characterized amplified region (SCAR) marker designated N6-441.Conclusion: Specific primers (Vshi-441F/Vshi-441R) amplified a unique DNA fragment in all V. shilonii isolates but not in the other Vibrio spp. This PCR assay showed significantly sensitive to the target DNA and reliably for the amplification the V. shilonii genome.Keywords: AHPND; RAPD; SCAR; Vibrio shilonii; Vietna

A Bibliometric Analysis of Studies Concerning Policy Issues in Covid-19 Pandemic

This research analysed the studies of policy on issues related to COVID-19. The results show the most productive countries, the most frequently cited sources, the most co-occurred topics of studies concerning policy issues since the epidemic was a breakout at the beginning. The data in this research were collected from the Scopus database with two search terms, "COVID-19" and "policy" of the social science domain, and published from the first day of 2020 to the search time (September 10, 2020). The final dataset consists of 384 valid documents analysed by descriptive statistics, and co-occurrence analysis was applied in R. Among 46 countries, the United States, the United Kingdom, Australia, China, India, and Italy are the leading countries that published these studies. Almost all the funded scholars focused on Europe, the Americas, and Asia. The main topics of the articles are "working in COVID-19 period", "community health and social support," "using ICT in teaching and learning," "human rights." Within funded studies, four interesting topics are "social well-being," "ICT infrastructure," "agricultural policy," and "born-digital." This study presents the current situation of how studies concerning policy issues have been issued to respond to the COVID-19 pandemic

SỰ NỞ HOA CỦA LOÀI VI KHUẨN LAM ĐỘC RAPHIDIOPSIS RACIBORSKII TẠI HỒ BUÔN PHONG, TỈNH ĐẮK LẮK

This study investigates species biodiversity composition, morphological characteristics and fluctuation in cell density of cyanobacterial Raphidiopsis raciborskii, and cylindrospermopsin toxin concentration in Buon Phong reservoir. The cylindrospermopsin concentration in the reservoir was identified by using the ELISA test. The results show that 23 species of cyanobacteria in 10 genera, 5 families, 3 orders (Chroococcales, Oscillatoriales, Noctoscales) were identified. Straight filamentous Raphidiopsis raciborskii bloomed all year round in the reservoir with cell densities of 53,6 ×106–58,3 × 107 cells/L. The results of the ELISA test show that cylindrospermopsin toxin in the reservoir existed during the 12 months of the studied period, ranging from 0.04 to 0.72 µg/L. Although the toxin concentration is below the hazard level (1 µg/L), the presence of cylindrospermopsin in the reservoir poses a potential risk because the reservoir water is used for domestic, livestock and aquaculture activities.Nghiên cứu này điều tra thành phần loài, đặc điểm hình thái, sự biến động mật độ tế bào của vi khuẩn lam (VKL) Raphidiopsis raciborskii và hàm lượng độc tố cylindrospermopsin trong hồ Buôn Phong. Hàm lượng độc tố được xác định bằng phương pháp ELISA. Kết quả cho thấy sự có mặt của 23 loài VKL phân bố trong 10 chi, 5 họ và 3 bộ (Chroococcales, Oscillatoriales, Noctoscales). Raphidiopsis raciborskii tồn tại dưới dạng sợi thẳng, nở hoa quanh năm với số lượng tế bào 53,6 × 106–58,3 × 107 tb/L. Độc tố cylindrospermopsin tồn tại trong suốt 12 tháng nghiên cứu với hàm lượng 0,04–0,72 µg/L. Mặc dù hàm lượng độc tố vẫn nằm dưới mức độ nguy hại (1 µg/L), nhưng sự xuất hiện độc tố trong nước hồ chứa cho thấy rủi ro tiềm tàng do đây là nguồn nước được sử dụng cho sinh hoạt, chăn nuôi và nuôi trồng thủy sản

SYNTHESIS, CHARACTERIZATION AND ELECTROCHEMICAL PERFORMANCE OF ACTIVATED CARBON SUPPORTED MnO2 FOR ELECTROCHEMICAL CAPACITOR

MnO2 was synthesized by adding activated carbon into KMnO4 solution and stirred in a magnetic or ultrasonic stirrer. The obtained MnAC samples were characterized by means of XRD, TGA, TPR-H2, SEM and BET. All samples are amorphous and have porous structure. MnAC-M prepared by magnetic stirring have higher manganese content, earlier reduction temperature, smoother surface area while MnAC-U prepared by ultrasonic stirring have larger specific surface area and pore volume

Anxiety symptoms and coping strategies among high school students in Vietnam after COVID-19 pandemic: a mixed-method evaluation

IntroductionThe objective of the current study was to examine the rate of high school students at risk of anxiety disorder during the COVID-19 pandemic in Vietnam, as well as the coping strategies utilized within this demographic.MethodsAn evaluation was conducted through the utilization of mixed methods, consisting of a combination of a cross-sectional study and in-depth interviews. In this study, a sample of 3,910 students from 13 high schools in Hanoi, Vietnam were selected for participation. The measurement of symptoms of anxiety disorder was conducted through the application of the seven-item General Anxiety Disorder (GAD-7) scale. To comprehend the underlying causes of anxiety and the various coping mechanisms employed, in-depth interviews were conducted.ResultsThe findings indicate a prevalence rate of anxiety disorder symptoms among students at 40.6% The prevalence rates of mild, moderate, and severe anxiety symptoms were found to be 23.9%, 10.9%, and 5.8%, respectively. In-depth interviews uncovered multiple sources of anxiety experienced by high school students, namely their academic performance, social interactions, prejudicial attitudes from their social circle, and familial expectations. Numerous coping strategies were then documented.DiscussionThe current investigation ascertained that there exists a moderate level of anxiety amongst high school students in Hanoi, Vietnam during the COVID-19 outbreak. Furthermore, this study configured potential indicators to identify vulnerable individuals and further suggests the development of targeted interventions

Speed profile optimization of an electrified train in Cat Linh-Ha Dong metro line based on pontryagin's maximum principle

An urban railway is a complex technical system that consumes large amounts of energy, but this means of transportation still has been obtained more and more popularity in densely populated cities because of its features of high-capacity transportation capability, high speed, security, punctuality, lower emission, reduction of traffic congestion. The improved energy consumption and environment are two of the main objectives for future transportation. Electrified trains can meet these objectives by the recuperation and reuse of regenerative braking energy and by the energy - efficient operation. Two methods are to enhance energy efficiency: one is to improve technology (e.g., using energy storage system, reversible or active substations to recuperate regenerative braking energy, replacing traction electric motors  by energy-efficient traction system as permanent magnet electrical motors; train's mass reduction by lightweight material mass...); the other is to improve operational procedures (e.g. energy efficient driving including: eco-driving; speed profile optimization; Driving Advice System (DAS); Automatic Train Operation (ATO); traffic management optimization...). Among a lot of above solutions for saving energy, which one is suitable for current conditions of metro lines in Vietnam. The paper proposes the optimization method based on Pontryagin's Maximum Principle (PMP) to find the optimal speed profile for electrified train of Cat Linh-Ha Dong metro line, Vietnam in an effort to minimize the train operation energy consumption