Comparison of BigraphTopology with Pairwise Skorokhod Convergent Topology

Park, Sung-Ki 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

Fiber Bundle U_(n)上의 特性寫像에 衣한 奇數次元球面 S^(2n-1)의 超曲面

曺鍾奇 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

By the connected expanding of fiber bundle 〔6〕,〔7〕 and Hopf-map 〔5〕, We computed 4-dimensional homotopy group π_(4)(R_(n)), n>=6 on S^(2n-1) about characteristic map〔8〕 of canonical form as following. We have only to compute the kernel of π_(4)(R_(5)→π_(4)(R_(6)) by 〔Theorem 1〕, we formed π_(4)(R_(4) as cyclie group of 2-order that generated as the image of β_(4) by 〔theorem 2〕. If it is decided that T_(6) : S^(4)→R_(5) represents image of the kernel's generator β_(4), because the projection of T_(6) p : R_(5)→S^(4) is deformed to a map T' : S^(4)→R_(4), The formation of T_(4) is generated by unitary group in orthogonal group by presenting T' as characteristic map following to unitary group U_(2) of fiber bundle on S^(5). Consequently, we gained the result π_(4)(R_(n))=0, n>=6 by presenting that p'T'_(m+1) is represents β_(4) by theorem 3, asserting that p'T'_(m+1) is homotope with the suspension of identity map f : S^(2m-1)→S^(2m-1) by induction.

Hypersurface of a Kaehlerian Manifold

Lee, Sung Baik 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

確率收束과 槪收束에 관한 考察

崔圭丁 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

We have abtained several limit theorem in the theory of probability which are collectively known as the law of large numbers. In this paper, deal with convergence in probability and almost everywhere convrgent.

連結開位相에 관한 硏究

金南吉 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

디페닐, 디페닐케톤과 요오드 사이의 전하 전이 착물

김일두,노봉오,정석진 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

Charge transfer complexes of diphenyl and diphenylktone with iodine in carbon tetrachloride have been carried out by Ultraviolet-Visible spectrophotometric. The stabilky constants, the molar extinction coefficients and the thermodymic constants of these complexes have been determined at various temperatures. The results are as follows: 1) The electronic transitions of these complexes have maximum of absorption at 282nm and the formation of one to one molecular complexes. 2) The molar extinctions coefficients of these complexes are more than ten thousands. 3) The molar of absurprtion moves to high energy as the concentration of the donor incrcases. 4) It is observed thar the stability constants are relatively large and the negative entropies are very small.

Scheffe´와 Anderson's 混合된 模型에 관한 硏究

鄭錫鉉 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

This paper is an attempt to discuss two-way mixed model which is available at present. The two models are Scheffe' model and Anderson & Bancroft model. This paper not only proposes a new criterion for testing a general hypothesis under general condions, but also gives an expression for the moments of the criterion and for an asymptotic cxpansion of its null distribution.

개구리 胚·幼生 및 成体의 透視標本 製作에 관한 硏究

曺男基,朴奉燮,吳永男 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

Rana nigromaculata Hallowell의 發生을 크게 나누어 볼때 첫째는 卵割과 胚의 發生이며 둘째는 器官의 發生이다. 이들 發生과정에 있어서 形態形成의 관찰결과는 다음과 같다. 1. 야외에서 산란된 卵塊의 卵을 채취하여 發生이 진행되어 가는 단계에 따라 3% Pormalin 액으로 고정하고 정지기에서 64細胞의 卵割까지 촬영하였다. 15시간후 桑實胚부터는 硏究室에 가져와 실내수조에서 사육하며, 그 경과를 관찰하였으며 胞胚 (24시간후), 낭배 (40시간후), 神經胚(80시간후), 尾芽胚(7)일후) 등은 발달되어서 幼生으로 되고 卵塊에서 부화(6일후) 되기까지 그 순서에 따라 고정하여 形態形成의 과정을 관찰하였다. 2. 器官의 發生, 즉 꼬리와 다리의 發生, 神經系와 감각기의 發生, 입·인두·아가미·허파의 發生, 消化管의 發生·脊索과 뼈의 發生등은 尾芽胚을 지나 이들의 原基는 결정된 것이다. 다만 形態的으로 볼때 70일이 경과되면 몸은 비대하고 꼬리의 근원에 뒷다리가 생겨나며, 80일이 지나면 앞다리가 생겨난다. 네 개의 다리가 갖추어지면 꼬리는 급속히 짧아지고 內새는 퇴화되어 허파와 피부로서 공기호흡이 시작하게 될 때육지로 기어 올라온다. 최초의 개구리 몸 길이는 1.5㎝정도이고 등에 독특한 반문이 있다. 發生의 속도는 수온에 의해서 좌우되므로 18~25℃로 사육하면 3개월 정도되면 개구리가 되었다. 3. 아울러 위의 發生 전과정을 투시표본화에 노력하였으며 이들 제작품은 생물과학 교재로 이용할 수 있으리라 사료된다. If the development of Rana nigromaculata Hallowell is classified in broad terms, first is cleavage and embriotic development, and second is organ development. Observation of the results of these two development processes can be summarized as follows: 1. In the process of development of R. nigromaculata in nature, time of selection was made optionally from the resting period to cleavage into 64 cells and the specimens were arrested in 3% formalin. From the Morula on R. nigromaculata was raised in the laboratory (water temperarure: 18~25℃) and the following observations in development were made: embryo development after 15 hours, blastula (after 24 hours), gastrula (after 40 hours), neurula (after 80 hours), tail bud germ (after 7 days), organ formation (after 10 days), and external gills (after 20 days). Observation was also made of the morphological development process from the egg mass to hatching (6 days later). 2. In the organ devclopnient proccss, after the tail bud stage (within 10 days), it could be seen that the primitive streak had already been determined. But From a morphological veiwpoint, the hind legs appear at the base of the rail after 70 days, and the front legs appear after 80 days. It was also observed that when formation of the four legs is complete, the tall rapidly shortens, the internal gills degenerate, and breating through the lungs and skin begins. The initial body length of R. nigromacuiata is approximately 1.5㎝ and the unique spots on the back appeared. 3. In addiaion to the optional selection of time for the entire development processabove, research has been done in the devciopment of traiisparent specimens. This research is considered to be helpful in the preparation of such transparent specimens as science materials for biolgy and also for understanding the embriotie development of vertebrates.

Silver Sulfide Halide 합성 및 물리적 성질에 관한 연구(I)

정학진,김일두,박성규,정오진 朝鮮大學校 自然科學硏究所 1982 自然科學硏究 Vol.5 No.-

Ag_(a)SX (Ag_(3)SCl, Ag_(2)SBr anp β-Ag_(3)SI) was synthesized by coprecipuation method according to the various reaction time and temperature. These synthetic compounds were identified by X-ray diffractometer (Rigakagu 4036 AI type) and ths thermal properties of synthesized compounds were checked by Differential Thermal Analyser (Shimadzu DT-2B type). The electrical conductivities of synthetic compounds were determined by Watanabe impedance bridge. and another physical properties were discussed by melting point apparatus and the method of density. The reaction mechanism and formation heat of these synthetic coinnnunds were discussed by X-ray peak intensities at various transition temperature. 1) The sysnthetic condition of compounds (Ag_(3)SCl, Ag_(3)SBr and β-Ag_(3)SI) used in the method of co-precipitation was at 290℃, 270℃ and 200℃ in heating temperature and over one hour in heating time, respectively. 2) The atomic distance of Ag-S and Ag-Ag are different according to the kinds of halide ions in the compounds. 3) The order of values on the X-ray peak intensity is Ag_(3)SCl Ag_(3)SBr<β-Ag_(3)SI, and these synthetic compounds have the ideal Antiperowski structures, 4) The stability of Ag_(3)SX complex is dependent upon halide ions and the order of stability is in the order of Ag_(3)SCl<Ag_(3)SBr<β-Ag_(3)SI. 5) The density of Ag_(3)SX crystal is 6.46-5.76 g/㎤ and the size of density is Ag_(3)SCl<Ag_(3)SBr<β-Ag_(3)SI. 6) The melting points of Ag_(3)SX crystals are similar to AgX compounds. 7) The electric conductivities of Ag_(3)SX crystals are incrcascd with high ionic property of halide ions and electric conductivities of Ag_(3)SX crystals have with as large as those of average in AgX, but activation energy is decreased. 8) If Ag_(3)SCl and Ag_(3)SBr were heated in N_(2) stream, these compounds were decomposed into Ag_(3)S, AgCl and AgBr at about 415℃ and 429℃, respectively and these compounds have no transhion temperature. 9) Silver sulfide idodide exists in two forms: β-Ag_(3)SI is stable up to 240℃, β-Ag_(3)SI was transformed into α-Ag_(3)SI over 240 C UUd a-AgaSI \\'as decomposed into Ag;S and AgI at about 560℃. The transformatlon temperature of the modification are as follows, β-Ag_(3)SI 240℃→ ←α-Ag_(3)SI 560℃→Ag_(2)S+AgI 10) The ΔH_(2) Ag_(3)SI calculated from ratios of peak area on the D. T. A. curves, is about 1.306 kcal/mol.

Investigation of Energy Transfer in Ln(III)/Aromatic Carboxylate Mixture

Yu, Jeong-A 朝鮮大學校 自然科學硏究所 1995 自然科學硏究 Vol.18 No.1

The energy transfer from aromatic acids (benzoic acid, 2-naphthoic acid, 9-anthroicacid) to lanthanide trivalent ions(Tb3+, Eu3+, Gd3+) with in methol solution are investigated by luminescence spectroscopy. The energy transfer is observed when the energies of the emissive states of metal ions are lower than that of triplet states of ligands. Only 2-naphthoic acid/Tb3+ complex which has activated back energy transfer from Tb3+ to the triplet state of 2-NA because of relatively small energy gap between the levels (450 cm-1),shows bimolecular quenching by oxygen. From this result we deduce that the rate of energy transfer is faster than O2 quenching rate.