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
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
基金project upported by National Natural Science Foundation of China under Grant No.10774108
文摘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.
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.