CÁC YẾU TỐ KINH TẾ VĨ MÔ TÁC ĐỘNG ĐẾN GIẢM NGHÈO Ở LÂM ĐỒNG

This study reviews the macroeconomic factors affecting poverty reduction in Lamdong province. We use a multiple regression model optimized by means of BMA (Bayesian Model Average) in which several macroeconomic variables includingincome, unemployment (employment), inflation and quality of human resources in Lamdong are employed. The results show that two important macroeconomic factors that affect the poverty reduction of Lamdong province on the extent of the importance of individual weights are: Per capita income and quality of human resources. Finally, the authorssuggest implications and solutions for policy formulation.Nghiên cứu này xem xét các yếu tố kinh tế vĩ mô tác động đến giảm nghèo của tỉnh Lâm Đồng, được xác định trên cơ sở xây dựng mô hình hồi qui bội tối ưu bằng phương pháp BMA (Bayesian Model Average) dựa vào kết quả các chỉ số về thu nhập, thất nghiệp (việc làm), lạm phát và chất lượng nguồn nhân lực tại Lâm Đồng. Kết quả nghiên cứu đã tìm thấy 2 yếu tố quan trọng, có ý nghĩa thống kê và giá trị thực tiễn tác động đến giảm nghèo của tỉnh Lâm Đồng theo mức độ tầm quan trọng của từng trọng số, đó là: Thu nhập bình quân và Chất lượng nguồn nhân lực. Cuối cùng tác giả trình bày hàm ý và khuyến nghị một số giải pháp từ kết quả nghiên cứu

Nghiên cứu ảnh hưởng của phụ gia chống bức xạ tử ngoại đến tính chất cơ học và khả năng chậm lão hóa của vật liệu polyme compozit trên cơ sở dầu lanh epoxy hóa

The photon energy in solar radiation is the most damaging excitator of the outdoor environment in polymer composite (PC) materials which include epoxidized linseed oil polymer. In this study, the effect of ultraviolet (UV) radiation on the change of PC material surface appearance and the reduction in mechanical properties was investigated. In addition, in order to diminish the effect of UV radiation on to polymer matrix, in this study anti-UV addtives was introduced. In which, UV-absorber methanone, 2-hydroxy-4-(octyloxy)-phenyl  (MHOP) and hindered amine light stabilizers (HALS) bis (1-octyloxy-2,2,6-tetramethyl-4-piperidyl) sebacate (BOTPS) was used. The results showed that in the presence of  2.0 %wt. MHOP and 3.0 %wt. BOTPS can be  restricted the degree of PC materials  surface change and reduction of the composite’s mechanical properties

SINH KHOÁNG PERMI - TRIAS MIỀN BẮC VIỆT NAM

Permo-Triassic metalogeny of North Vietnam The Permo-Triassic period in North Vietnam has determined three ore complexes, formed in the different structures: 1/ Cu-Ni-(PGE) and Ti-Fe-V ore complex; 2/ gold-sulfide and 3/ tin-sulfide. The first complex consists of Cu-Ni-(PGE) mineralization associated with differentiated mafic-ultramafic intrusions of various volcano-plutonic types of the Song Da, Song Hien rift zones, and fold belts surrounding the Song Chay Dome. The Cu-Ni-PGE and Ti-Fe-V complexes, temporally corresponding to the two stages of plume magmatic activities: 260 Ma (Song Hien and Song Da) and 250 Ma (Phu Ngu-Lo Gam), similar to the associated ore occurrences of Emeishan LIP in Southwest of China (Limahe, Jang Baoshan, Panzhihua,...). Gold-sulfide ore complexes, including Au-As, Au-Sb, Sb-Hg-Au and Hg-Sb-(Au) types widespread in the Song Da and Song Hien rift zones as well as in Paleozoic Lo Gam and Quang Ninh folded structures. Within these structures, ore distribution in the form of ore nodes: Lang Vai, Lang Neo, Loc Shoa, Khe Chim ... Common features of these ore nodes are similar ore chemistry(Au, Sb, As, Hg) and zonation: Au-As → Au-Sb → As-Sb-Hg → Hg, as well transitional relations between different types of ore: Au-As and Au-Sb, Au-Sb and Sb-Hg (Lang Vai, Lang Neo ore nodes,...). Ages of ore formation of this complex range from 252-229 Ma, and spatial correlation with bimodal volcano - plutonic (basalt - rhyolite, rhyolite - basalt, granite - porphyry) as well as with small granite and gabbro - syenite intrusion, with age variation of about 247 -233 Ma

ĐẶC ĐIỂM KHOÁNG VẬT - ĐỊA HÓA VÀ NGUỒN GỐC CÁC MỎ CHÌ - KẼM CẤU TRÚC LÔ GÂM, MIỀN BẮC VIỆT NAM

Mineralogical and geochemical characteristics and forming conditions of lead - zinc deposits in Lo Gam structure, northern VietnamIn terms of reserves, lead - zinc deposits in the Lo Gam structure have made up more than 80% of the Pb-Zn resources in Vietnam. The deposits form four distinct ore zones are Lang Hich (Thai Nguyen), Cho Don, Cho Dien (Bac Kan), and Na Son (Ha Giang) relatively but basically belong to a common mineralization zone, extending over 100 kmfrom east to west. The Pb-Zn deposits in the ore zone have similar characteristics to Mississippi type (MVT): distribution in Devonian carbonate sediments; concentrating at the intersection of differently orientated fractures; the mineral zone includes vein ore bodies and vascular network (bunch- and vein- disseminated types); presence of metasomatism (marmorization and developing of quartz - carbonate veins,..), low and moderate temperature hydrothermal (250oC).However, different significances to MVT have also been recorded such as: widespreads of Permo-Triassic magmatisms; ore bedding is not typical; spectrum of the impurity elements are broad (In, Bi, Sb, Au, Ag, Cu, Cd) which is usually not specific to the MVT; sulfur isotopic composition value (δS34 = 2.68 ‰) close to the meteoritic sources; and ore impurities (In, Bi, Sb, Cu) show the endogenous and deep origin. These characteristics demonstrate the Pb-Zn deposits incarbonate and terrigenous sediments of Lo Gam structure belongs to the type of the low - average temperature hydrothermal, formed in association with Permo-Triassic magmatic activities.These differences in mineral composition, spectral of impurity elements as well as their concentration in differentdeposits show the complex processes of ore formation in association with different magma composition. Simple mineralcomposition and limited set of impurity elements (Cd, Ag, Sb, As) of the Lang Hich mine as well as the absence of magmatic activity makes it seems like MVT the most. In contrast, the Cho Don and Cho Dien Pb-Zn mining area characterize by enrichment in In (75.8 ppm), Sn (307.5 ppm), Cu (1080 ppm), Ag (157.7 ppm), Bi (99 ppm), As (13 650ppm) show widespread magmatic activities (Phia Bioc granitoid complex, Cho Don syenite, ...). The presence of rare earth minerals (orthite) and high concentrations of Mo, Re and Rb in Na Son mine, probably related to the extensive development of the subalkaline volcanic and intrusive rocks (Tong Ba complex)

ĐẶC ĐIỂM QUẶNG HÓA VÀ KHOÁNG VẬT CÁC MỎ KẼM CHÌ KHU VỰC LÀNG HÍCH

Chemical and mineralogical characteristics of Zn-Pb ores in Lang Hich areaLang Hich ore deposit consisting of 6 mining places (West Metis, East Metis, Hang Chua, Bac Lau, Mo Ba - 1Aoven, Mo Ba - 1B) was discovered in 1905 and has been exploited since 1913. Anually, the mine have been exploited ~20000 T, inspite of lacking detail investigation in mineralogy and chemistry of ores.Two mineral assemblages have been clafsified in Lang Hich deposit as followed : 1) pyrite-galenite-sphalerite (Metis,Mo Ba), 2) galenite-sphalerite (Bac Lau, Hang Chua). Basically, sphalerites, have low Fe, In contents ; Bi is medium ; Mn and Cd is high, especially, Cd have very high content. While galenite contains Ag at economical value, besides, the presence of Sb is recored. Other investigation also shows the existing of tetraedrite group, an Ag bearing mineral group, and bournonite, a Sb bearing mineral

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

Morphology 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

Nghiên cứu ảnh hưởng của các chất xúc tiến (M = Mn, Ce, Zr, và Cr) đối với hoạt tính xúc tác của vật liệu 15%Co/0,05m-SBA-15 trong phản ứng tổng hợp Fischer-Tropsch

This paper presents the effect of metal promoters (M = Ce, Cr, Mn  and Zr) on the catalytic performance of 15%Co/0.05M-SBA-15 catalysts for the Fischer- Tropsch synthesis. The results showed that the promoters were on SBA-15 influenced on the contribution of Co particles (shape, size, dispersion) on the walls of M-SBA-15 materials. These changes not only increased CO conversion but also significantly increased the liquid product C5+ selectivity. Catalysts were characterized by BET, XRD, TEM, UV-vis, H2-TPR, TPD-NH3, ICP. The catalytic performances of catalysts for Fischer-Tropsch synthesis were tested in a fixed bed reactor. The liquid product was analyzed by GC-MS to calculate hydrocarbon selectivity

NGHIÊN CỨU SỬ DỤNG CO2 TỪ KHÍ THẢI ĐỐT THAN ĐỂ NUÔI VI TẢO SPIRULINA PLATENSIS

UTILIZATION OF CO2 CAPTURED FROM THE COAL-FIRED FLUE GAS FOR GROWING  SPIRULINA PLATENSIS SP4 The paper presents the results concerning the utilization of CO2 captured from the coal-fired flue gas for growing the  Spirulina platensis SP4 in laboratory condition. Several research results on the conversion of CO32- and HCO3- in algal suspension and CO2 intake efficiency by the alga were presented. The growth and  biomass quality of  Spirulina platensis SP4 using CO2 from fired-coal flue gas were equivalent to that of the alga grown in the pure CO2 experimental lot