Macroeconomic factors and stock prices – A case of real estate stocks on Ho Chi Minh stock exchange

This study investigates the relationship of selected economic factors such as inflation rate, 10-year Government bond yields, GDP growth rate, exchange rate, and stock trading volumes and real estate stock price of 38 real estate companies listed on HOSE in period 7 years, from January 2009 to September 2015.The study found that 3 economic factors (inflation rate, GDP growth rate, and exchange rate) impact significantly on real estate stock prices; but the relationship between 10-year Government bond yield and trading volume, and real estate stock prices was not found. The research’s results imply that these factors should be taken into account as predictors of the movement of real estate stock price in Vietnamese stock market

DESIGN OF A DUAL-POLARIZED MICROSTRIP PATCH ANTENNA WITH V-SHAPED SLOT FOR 2.4 GHz WLAN APPLICATIONS

This paper presents the design of a dual-polarized microstrip patch antenna used for 2.4 GHz WLAN applications. The designed antenna consists of a circular patch fabricated on low-cost FR-4 substrate with a V-shaped slot carved on its surface and a circular metal reflector. The antenna size and positions of the two feeding ports using coaxial cables are optimized to obtain a dual-polarized antenna having resonant frequency at 2.44 GHz, about 8-dBi peak gain, and the isolation between the two ports below –15 dB in the required band. The measured S-parameter results show good agreement with the simulation. The proposed antenna can be used for 2.4 GHz wireless access points (APs) with 2x2 multiple-input multiple-output (MIMO) antenna systems

THIẾT KẾ ANTEN VI DẢI PHÂN CỰC TRÒN CHO ỨNG DỤNG WLAN DẢI TẦN 2,4 GHZ

Nô?i dung ba?i viê?t na?y trình bày về một anten vi dải phân cực tròn cho ứng dụng WLAN dải tần 2,4 GHz. Anten được thiết kế bao gồm một tấm mạch in FR-4 hình tròn với một khe được khắc hình chữ V và một tấm kim loại hình tròn (tấm phản xạ). Bản mạch in FR-4 được đặt cách tấm phản xạ một khoảng cách nhỏ. Kích thước của anten và vị trí đặt 2 ngõ vào (port) tiếp tín hiệu sử dụng cáp đồng trục được tối ưu để có được sóng phân cực tròn, tần số cộng hưởng 2,44 GHz, độ lợi đỉnh 8,43-dBi, và độ cách ly giữa 2 ngõ vào dưới ? 20 dB. Các kết quả mô phỏng phù hợp với kết quả đo đạc thực tế. Anten cũng có thể được sử dụng như một anten phân cực kép cho các access point (AP) dải tần 2,4 GHz có hệ thống anten MIMO 2x2

Changing of Soil Properties under Drought and Saline Water Intrusion Conditions in Different Land-Use Patterns – A Case Study in the Ben Tre Province, Vietnam

The study aimed to assess the change of soil properties of land use patterns affecting drought and saline intrusion in the Ben Tre province during 2019–2020. Soil samples were taken, and the data on land use patterns of Rice, bare soil, Shrimp, and Coconut in three horizons were at 0–20 cm, 20–60 cm, and 60–100 cm. The analysis of soil pH, EC, organic matter, and bulk density was conducted to assess the changes in soil properties. The results showed that soil pH, EC, and salinity had to be slightly increased in 2020, but soil organic matter and bulk density were not changed. Therefore, the Ben Tre province’s drought and saline intrusion conditions had a negligible impact in general evaluation. However, it is necessary to perform more other studies to clarify the effects of drought and salinity

Projections of Future Climate Change in the Vu Gia Thu Bon River Basin, Vietnam by Using Statistical DownScaling Model (SDSM)

Future projections of anthropogenic climate change play a pivotal role in devising viable countermeasures to address climate-related risks. This study strove to construct future daily rainfall and maximum and minimum temperature scenarios in Vu Gia Thu Bon river basin by employing the Statistical DownScaling Model (SDSM). The model performance was evaluated by utilizing a Taylor diagram with dimensioned and dimensionless statistics. During validation, all model-performance measures show good ability in simulating extreme temperatures and reasonable ability for rainfall. Subsequently, a set of predictors derived from HadCM3 and CanESM2 was selected to generate ensembles of each climatic variables up to the end of 21st century. The generated outcomes exhibit a consistent increase in both extreme temperatures under all emission scenarios. The greatest changes in maximum and minimum temperature were predicted to increase by 2.67–3.9 °C and 1.24–1.96 °C between the 2080s and reference period for the worst-case scenarios. Conversely, there are several discrepancies in the projections of rainfall under different emission scenarios as well as among considered stations. The predicted outcomes indicate a significant decrease in rainfall by approximately 11.57%–17.68% at most stations by 2099. Moreover, all ensemble means were subjected to the overall and partial trend analysis by applying the Innovative-Şen trend analysis method. The results exhibit similar trend patterns, thereby indicating high stability and applicability of the SDSM. Generally, it is expected that these findings will contribute numerous valuable foundations to establish a framework for the assessment of climate change impacts at the river basin scale