Boswellia sacra from Burseraceae family, grows is limited and the land unsuitable for traditional agriculture wild in dry hot lands of southern part of Oman （Dhofar）, where the water purpose. Boswellia sacra is a mu...Boswellia sacra from Burseraceae family, grows is limited and the land unsuitable for traditional agriculture wild in dry hot lands of southern part of Oman （Dhofar）, where the water purpose. Boswellia sacra is a multipurpose tree, but more famous for its high value olibanum. The olibanum is used for ritual and in church ceremonies worldwide, traditional medicines, pharmaceutical, perfumery, cosmetics, chewing, painting, food flavouring. In addition to this, the species has other numerous environmental, historical, and socio-economical benefits. This study is based on literature reviews, and on the interview local people, as well as on personal field experiences. The objective is to introduce the importance of the species and to study the native habitats, the distribution, and the harvesting techniques. The soil is carbonitic, isohypertherrnic, lithic torriothent, poor in mineral elements. The olibanum produces when the tree tapped by making a thin vertical slicing into the tree trunk. Initial size should be about 18 cm2 （3 × 6 cm） and 1-2 mm in depth and the diameter tree trunk should be not less than 10 cm. Tree tapping should be stopped 2-3 weeks before the rain season. The method of tree tapping and olibanum collection need to be revised for long-term tree protection.展开更多
Al Jabal al Akhdar(Green Mountain) in arid northern Oman has freshwater resources that had supported small communities for hundreds of years. Jabal Akhdar receives more rainfall(300-400 mm) when compared to the desert...Al Jabal al Akhdar(Green Mountain) in arid northern Oman has freshwater resources that had supported small communities for hundreds of years. Jabal Akhdar receives more rainfall(300-400 mm) when compared to the desert plains. In the last few years, this region had undergone enormous changes due to rapid development. The resident and transient populations have increased and their activities exert severe stress on the water resources. There are 24 retention reservoirs in the area, but most are eutrophic and the nutrient loading is due to input of animal fecal matter via surface run-off. As expected, these waters contaminated with coliform bacteria and some have pathogenic Escherichia coli. Drinking water needs of all the villages met by groundwater extraction. Because of poor quality, the surface water in the reservoirs is under-utilized. A low-cost lowmaintenance treatment system designed, constructed and operated in one village to clean the reservoir water for non-drinking human use. The treatment unit improved the water quality parameters. A survey among the adult male population of the village showed their eagerness to adopt this system and use the treated reservoir water for uses other than agriculture. Establishment of these treatment units in other villages should reduce the pressures on groundwater extraction.展开更多
By means of microscopy and laser Raman spectroscopy, the authors studied the fluid inclusions in petrography. The results show that there exist three-phase CO2-bearing and two-phase aqueous inclusions in gold ore; the...By means of microscopy and laser Raman spectroscopy, the authors studied the fluid inclusions in petrography. The results show that there exist three-phase CO2-bearing and two-phase aqueous inclusions in gold ore; the fluid of NaC1-H2O-CO2 system went through immiscibility in ore-forming process. Ore-forming fluids were of low salinity （0. 82%- 5.40% NaCleqv）, low density （0. 54-0.93 g/cm3 ） ; mineralization temperature were concentrated in 320℃-340℃ , with ore-forming pressure in 62-126 MPa and mineralization depth in 6.34-9.35 kin. The fluid inclusions in quartz are generally characterized by a small amount of CO2 and Na. Combined with recent results of the isotopic analysis for fluid inclusions and dating data, it was indicated that the main ore-forming fluids derived mainly from source of mantle-derived fluids with a small amount of magmatic fluid and meteoric water. The genetic type was mesothermal gold deposits involved by mantle-derived fluids.展开更多
In this paper, Yau’s conjecture on harmonic functions in Riemannian manifolds is generalized to Alexandrov spaces. It is proved that the space of harmonic functions with polynomial growth of a fixed rate is finite di...In this paper, Yau’s conjecture on harmonic functions in Riemannian manifolds is generalized to Alexandrov spaces. It is proved that the space of harmonic functions with polynomial growth of a fixed rate is finite dimensional and strong Liouville theorem holds in Alexandrov spaces with nonnegative curvature.展开更多
文摘Boswellia sacra from Burseraceae family, grows is limited and the land unsuitable for traditional agriculture wild in dry hot lands of southern part of Oman （Dhofar）, where the water purpose. Boswellia sacra is a multipurpose tree, but more famous for its high value olibanum. The olibanum is used for ritual and in church ceremonies worldwide, traditional medicines, pharmaceutical, perfumery, cosmetics, chewing, painting, food flavouring. In addition to this, the species has other numerous environmental, historical, and socio-economical benefits. This study is based on literature reviews, and on the interview local people, as well as on personal field experiences. The objective is to introduce the importance of the species and to study the native habitats, the distribution, and the harvesting techniques. The soil is carbonitic, isohypertherrnic, lithic torriothent, poor in mineral elements. The olibanum produces when the tree tapped by making a thin vertical slicing into the tree trunk. Initial size should be about 18 cm2 （3 × 6 cm） and 1-2 mm in depth and the diameter tree trunk should be not less than 10 cm. Tree tapping should be stopped 2-3 weeks before the rain season. The method of tree tapping and olibanum collection need to be revised for long-term tree protection.
文摘Al Jabal al Akhdar(Green Mountain) in arid northern Oman has freshwater resources that had supported small communities for hundreds of years. Jabal Akhdar receives more rainfall(300-400 mm) when compared to the desert plains. In the last few years, this region had undergone enormous changes due to rapid development. The resident and transient populations have increased and their activities exert severe stress on the water resources. There are 24 retention reservoirs in the area, but most are eutrophic and the nutrient loading is due to input of animal fecal matter via surface run-off. As expected, these waters contaminated with coliform bacteria and some have pathogenic Escherichia coli. Drinking water needs of all the villages met by groundwater extraction. Because of poor quality, the surface water in the reservoirs is under-utilized. A low-cost lowmaintenance treatment system designed, constructed and operated in one village to clean the reservoir water for non-drinking human use. The treatment unit improved the water quality parameters. A survey among the adult male population of the village showed their eagerness to adopt this system and use the treated reservoir water for uses other than agriculture. Establishment of these treatment units in other villages should reduce the pressures on groundwater extraction.
文摘By means of microscopy and laser Raman spectroscopy, the authors studied the fluid inclusions in petrography. The results show that there exist three-phase CO2-bearing and two-phase aqueous inclusions in gold ore; the fluid of NaC1-H2O-CO2 system went through immiscibility in ore-forming process. Ore-forming fluids were of low salinity （0. 82%- 5.40% NaCleqv）, low density （0. 54-0.93 g/cm3 ） ; mineralization temperature were concentrated in 320℃-340℃ , with ore-forming pressure in 62-126 MPa and mineralization depth in 6.34-9.35 kin. The fluid inclusions in quartz are generally characterized by a small amount of CO2 and Na. Combined with recent results of the isotopic analysis for fluid inclusions and dating data, it was indicated that the main ore-forming fluids derived mainly from source of mantle-derived fluids with a small amount of magmatic fluid and meteoric water. The genetic type was mesothermal gold deposits involved by mantle-derived fluids.
文摘In this paper, Yau’s conjecture on harmonic functions in Riemannian manifolds is generalized to Alexandrov spaces. It is proved that the space of harmonic functions with polynomial growth of a fixed rate is finite dimensional and strong Liouville theorem holds in Alexandrov spaces with nonnegative curvature.
