59 research outputs found
ĐẶC ĐIỂM QUẶNG HÓA VÀ KHOÁNG VẬT CÁC MỎ KẼM CHÌ KHU VỰC LÀNG HÍCH
Get PDFChemical 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
Phát triển đội ngũ giảng viên các trường cao đẳng y tế trên địa bàn thành phố Hà Nội trong giai đoạn hiện nay
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81 sơ đồ kế toán và lập báo cáo tài chính ở các đơn vị hành chính sự nghiệp
No full text486 tr. ; 27 cm
Tìm hiểu lịch sử ấp Ánh Sáng - Đà Lạt : 1952 - 2010 : Tóm tắt luận văn Thạc sĩ Lịch sử
No full text24 tr. ; 21 cm
Tìm hiểu lịch sử ấp Ánh Sáng - Đà Lạt : 1952 - 2010 : Luận văn Thạc sĩ Lịch sử
No full text136 tr. : minh hoạ ; 29 cm
Studying Effect of Rotor Slot Numbers on Efficiency and Power Factor of Line Start Permanent Magnet Synchronous Motors in Steady State
Full text linkThese days, line start permanent magnet synchronous motors with high productivity and high power factor in steady state will be a feasible solution to partially replacing squirrel cage induction motors which are widely used. In designing process. Beside stator's configuration, dimension of magnet rod and the type of magnet material, motor‘s productivity and power factor are especially influenced by the rotor's configuration. Therefore, this paper studies the effect of number of rotor slots as one of the aspects of rotor's configuration on productivity and power factor of a 2,2 kW, 3 phase, 4 pole line start permanent magnet synchronous motor. As a result, some good proposals enhancing productivity and power factor of these motors will be extracted
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