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从保值作用看黄金
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作者 胡宪铭 《中国黄金经济》 2000年第5期50-50,共1页
关键词 黄金 金融变量 保值作用
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电脑的保值作用
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作者 张千庭 《家电应用技术》 1996年第4期29-30,共2页
关键词 计算机 市场经济 保值作用
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浅析套期保值会计的运用 被引量:1
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作者 孙霞 《时代金融》 2011年第10Z期26-27,共2页
套期保值业务是为了回避现货交易中价格波动带来的风险,锁定生产经营成本,实现预期收益。本文基于套期保值业务的作用,在探讨其实际操作与账务处理方面问题的基础上,对其中一些难点进行分析并提出思考。
关键词 套期保值作用 难点问题 思考
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Entanglement of a Five-Qubit Heisenberg XX Chain in a Magnetic Field
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作者 CAO Min LING Yin-Sheng ZHU Shi-Qun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第5期811-814,共4页
We calculate the eigenvalues and eigenvectors of a five-qubit isotropic Heisenberg model in an external magnetic field, and give analytical results for the concurrence of two nearest-neighbor qubits. A magnetic field ... We calculate the eigenvalues and eigenvectors of a five-qubit isotropic Heisenberg model in an external magnetic field, and give analytical results for the concurrence of two nearest-neighbor qubits. A magnetic field can eliminate degeneration and change the ground state of the system. Therefore increasing the value of the magnetic field can induce entanglement in a certain range both for the antiferromagnetic and ferromagnetic case. 展开更多
关键词 ENTANGLEMENT five-qubit Heisenberg chain
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Distribution Boswellia sacra in Dhofar Mountains, Sultanate of Oman: Economic Value and Environmental Role
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作者 Mohsin Musalim Hassan Alaamri 《Journal of Life Sciences》 2012年第6期632-636,共5页
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
关键词 OLIBANUM frankincense tree tapping soil carbonitic isohyperthermic lithic torriothent
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