9 research outputs found
ĐẶC ĐIỂM HÌNH THÁI VÀ THÀNH PHẦN HÓA HỌC CỦA ZIRCON TRONG GRANITOID KHỐI NÂNG PHAN SI PAN: Ý NGHĨA CỦA CHÚNG TRONG VIỆC XÁC ĐỊNH NGUỒN GỐC ĐÁ VÀ LỰA CHỌN CHO PHÂN TÍCH ĐỒNG VỊ
Get PDFMorphology and chemistry of zircon from Phanerozoic granitoids in Fansipan uplift: their significance in determination of rock type and select for isotopic analysis Based on morphological characteristics and chemical composition of zircon in the Phanerozoic granitoids in Fansipan uplift, identificable signatures of primary zircon inigneous rocks are initially established. On morphological characteristics: zircon crystals intact crystal shape with two pointed edges (tetragonal prism or pyramid crystals), is quite clear, usually colorless, yellow-brown, brown-pink color,.. Chemical characteristics of zircon: HfO2 2%, the Zr/Hf ratio in zircon from 17 to 380, these values prove the magmatic origin and correlate with the high total alkaline rocks: syenite, nepheline syenite, granosyenite,.. These characteristics have to be noted in the selection process for zircon isotopic analysis. Based on geochemical characteristics, zircon of two rock types are initially distinguished: 1/ Zircon in I-type granite (consist of granosyenite, alkaline granosyenite, quartz syenitodiorite, syenite,....), characterized by: HfO2 content 2 wt.%, the Zr/Hf ratio is high (100), the Hf/(Hf + Zr) ratio 0.025; and 2/ Zircon in A-type granite (afvedsonite bearing granite), characterized by: HfO2 content 2.5 wt.%, low Zr/Hf ratio (20), Hf/(Hf + Zr) ratio 0.025, and ThO2 and UO2 content tends to be higher than the first type
The effect of Covid-19 pandemic on FDI inflows in Vietnam: Empirical evidence
Get PDFFDI inflows significantly contribute to promoting economic development and growth and creating more jobs in Vietnam. Attracting more FDI inflows has become one of Vietnam’s priority policies to solve the problem of lack of capital for development. Does the Covid-19 pandemic reduce FDI inflows to Vietnam? For the answer, the study analyses and investigates the effect of the Covid-19 pandemic on FDI inflows in Vietnam from January 2020 to October 2021 using the instrumental variable estimator and the OLS regression. The results indicate that the Covid-19 diseases decrease FDI inflows. Furthermore, economic growth, trade openness, and inflation are determinants of FDI inflows. The findings in this study suggest some policy implications relating to FDI inflows in the period of the Covid-19 pandemic
Tin học và ứng dụng trong y - sinh học : Dùng cho đào tạo bác sĩ y học cổ truyền
No full text231 tr. : minh hoạ ; 27 cm
Tin học và ứng dụng trong y - sinh học : Dùng cho đào tạo bác sĩ y học cổ truyền
No full text231 tr. : minh hoạ ; 27 cm
