著者

橋爪 邦夫

出版者

近畿大学工学部

雑誌

近畿大学工学部研究報告 (ISSN:0386491X)

巻号頁・発行日

no.45, pp.149-171, 2011

---

[Synopsis] The energy Hamiltonian, given by Heisenberg in 1928, to discuss the physical properties and the atomics tructure of ferromagnetic substance is as follows: H=—2Σ__<ij>J_<ij>S_i・S_j.-gβΣ__iS_i・H. A spinv ariable S_i is associated with each lattice site. In the Ising model of J_<ijx>=J_<ijy>=0 and J_<iijz>≠0, proposed by E. Ising in Zeit. Phys. 31 253(1925), the above Hamiltonian is simplified as follows : H=-2Σ__<ij>J_<ij>S_<iz>S_<jz>-gβHΣ__iS_<iz>・S_<iz>=±1/2. The system is an array of N fixed points calld lattice sites that form an n-dimensional periodic lattice. The energy of the system in the configuration specified by {S_i} is as follows : E{S_i}=εΣ__<ij>S_iS_j-βHΣ__iS. S_i=+1 denotes that the ith site has spin ip and S_i=-1 detotes that the ith site has spin down. The partition function is Z(H, T)=Σ__<S_1>Σ__<S_2>・・・Σ__<S_N>e^<-<E{S_i}>/<K_BT>>=e^<<1/k_BT>N(1/2γε-βH)>Σ^^N_<N_+>e^<-2・1/<k_BT>(εγ-βH)N_+>Σ^1__<N_++>g(N_+,N_++)e^<4・1/<K_BT>εN_++>. Next the Ising model can be made to simulate the system of a lattice gas and a binary alloy of other than a ferromagnetic substance by a change of names.

著者

仲宗根 薫

出版者

近畿大学

雑誌

近畿大学工学部研究報告 (ISSN:0386491X)

巻号頁・発行日

vol.39, pp.15-18, 2005-12-20

---

Acetyl-CoA carboxylase is key enzyme involved in the starting for fatty acid synthesis. In this study, we have cloned and sequenced gene cluster encoding acetyl-CoA carboxylase from a deep-sea piezo-and psychrophilic bacterium, Shewanella violacea strain DSS12. Sequence and structural analyses were done to understand structural-function relationships for adapting under high pressure and low temperature conditions. The cloned fragment contained two open reading frames, designated the accB and accA genes, capable of encoding a 538-amino-acid protein of 58.1 kDa and a 573-amino-acid protein of 61.5 kDa, respectively. The protein (AccA) encoded by the accA gene was strikingly similar to biotin carboxylase subunits of acetyl-CoA and propionyl-CoA carboxylases and of pyruvate carboxylase. The putative motifs for ATP binding, CO_2 fixation, and biotin binding were found in AccA. The aceB gene was located upstream of the accA gene, and they formed a two-gene operon. The protein (AccB) encoded by the aceB gene showed high degrees of sequence similarity with carboxyltransferase subunits of acetyl-CoA and propionyl-CoA carboxylases and of methylmalonyl-CoA decarboxylase. Carboxybiotin-binding and acyl-CoA-binding domains, which are conserved in several carboxyltrausferase subunits of acyl-CoA carboxylases, were found in AccB.

著者

嶽間沢 秀孝 児島 忠倫

出版者

近畿大学

雑誌

近畿大学工学部研究報告 (ISSN:0386491X)

巻号頁・発行日

vol.39, pp.179-184, 2005-12-20

---

It is important to clarify evaporation characteristic of liquid fuel such as gasoline and diesel fuel. This study was conducted on evaporation phenomena of a fuel droplet on a hot wall. Several kinds of liquid normal-paraffin such as n-pentane, n-hexane, n-heptane, n-octane, n-nonane and n-decane and constitutional isomers were used as the test. The influence molecular structure of fuel affect evaporation lifetime was investigated in detail.