The basic approach to computer analysis of the CICC in superconducting Tokamak HT-7U is given and discussed. We will apply a 1-D mathematical model (Gandalf) to investigate the stability of CICC at real operating mod...The basic approach to computer analysis of the CICC in superconducting Tokamak HT-7U is given and discussed. We will apply a 1-D mathematical model (Gandalf) to investigate the stability of CICC at real operating modes of Tokamak. 1-D model can be directly adopted to follow the evolution of the zone when the energy input is large enough and the coil quenches. In this report, we will analyze the stability of typical CICC (including pure copper) and discuss effect of copper on the stability of CICC.展开更多
Safety systems, built on state-of-the-art technology, are essential for achieving acceptable levels of plant safety to minimize hazards to the reactor and the general public. The second shutdown system(SSS) as an engi...Safety systems, built on state-of-the-art technology, are essential for achieving acceptable levels of plant safety to minimize hazards to the reactor and the general public. The second shutdown system(SSS) as an engineered safety feature and a part of the reactor protection system(RPS) is a means for rapidly shutting down a nuclear reactor, keeping it in a subcritical state and serving as a backup to the first shutdown system(FSS). In this research, one SSS with two types of optimum chamber designs is proposed that take into account the main current characteristic features of the Tehran research reactor with improvements over earlier designs. They are based on a liquid neutron absorber injection that is preferably different, diverse, and independent from the FSS based on the rod drop mechanism. The major design characteristics of this SSS with two different chambers were investigated using MCNPX 2.6.0 code. The performed calculations showed that the designed SSS is a reliable shutdown system, assuring an appropriate shutdown margin and injection time, with no significant effects on the effective delayed neutron fraction while causing minimal variations to the core structure. Further, the reasonable financial cost and the prolongation of the operation cycle are additional advantages of this design.展开更多
Long noncoding RNA (lncRNA) is a leader of the degree of more than 200 nucleotides, almost do not have the function of protein coding endogenous RNA molecules. Recent studies show that, lncRNA is not encoded protein, ...Long noncoding RNA (lncRNA) is a leader of the degree of more than 200 nucleotides, almost do not have the function of protein coding endogenous RNA molecules. Recent studies show that, lncRNA is not encoded protein, but it has a wide range of biological functions, and lncRNA in human diseases, especially in oncology, more and more attention has been paid to its role. Nasopharyngeal carcinoma (NPC) is a common malignant tumor of the head and neck in South China, which poses a serious threat to people’s health and life. Studies found that lncRNA is widely involved in the invasion, metastasis and prognosis of nasopharyngeal carcinoma (NPC). In this article, we will review the research progress of lncRNA in nasopharyngeal carcinoma.展开更多
文摘The basic approach to computer analysis of the CICC in superconducting Tokamak HT-7U is given and discussed. We will apply a 1-D mathematical model (Gandalf) to investigate the stability of CICC at real operating modes of Tokamak. 1-D model can be directly adopted to follow the evolution of the zone when the energy input is large enough and the coil quenches. In this report, we will analyze the stability of typical CICC (including pure copper) and discuss effect of copper on the stability of CICC.
文摘Safety systems, built on state-of-the-art technology, are essential for achieving acceptable levels of plant safety to minimize hazards to the reactor and the general public. The second shutdown system(SSS) as an engineered safety feature and a part of the reactor protection system(RPS) is a means for rapidly shutting down a nuclear reactor, keeping it in a subcritical state and serving as a backup to the first shutdown system(FSS). In this research, one SSS with two types of optimum chamber designs is proposed that take into account the main current characteristic features of the Tehran research reactor with improvements over earlier designs. They are based on a liquid neutron absorber injection that is preferably different, diverse, and independent from the FSS based on the rod drop mechanism. The major design characteristics of this SSS with two different chambers were investigated using MCNPX 2.6.0 code. The performed calculations showed that the designed SSS is a reliable shutdown system, assuring an appropriate shutdown margin and injection time, with no significant effects on the effective delayed neutron fraction while causing minimal variations to the core structure. Further, the reasonable financial cost and the prolongation of the operation cycle are additional advantages of this design.
文摘Long noncoding RNA (lncRNA) is a leader of the degree of more than 200 nucleotides, almost do not have the function of protein coding endogenous RNA molecules. Recent studies show that, lncRNA is not encoded protein, but it has a wide range of biological functions, and lncRNA in human diseases, especially in oncology, more and more attention has been paid to its role. Nasopharyngeal carcinoma (NPC) is a common malignant tumor of the head and neck in South China, which poses a serious threat to people’s health and life. Studies found that lncRNA is widely involved in the invasion, metastasis and prognosis of nasopharyngeal carcinoma (NPC). In this article, we will review the research progress of lncRNA in nasopharyngeal carcinoma.
