Kazuo ASO

National Society of Professional Engineers

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Static behavior of a pipe string designed for mining manganese nodules.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A (1988)

Shifeng YUAN Kazuo ASO Junji Tani

On the basis of linear beam theory, the static behavior of a pipe string designed for mining manganese nodules is formulated as a singularly perturbed boundary-value problem. This problem is analyzed by the method of matched asymptotic expansions and Galerkin's method. Static pipe deflections and bending moments are evaluated for the practical range of towing speeds of the ship. The pipe deflections obtained by Galerkin's method agree well with those by the method of matched asymptotic expansions. However, it is found that Galerkin's method with the beam function is not effective in evaluating bending moments of the pipe string.

Towing

10.1299/kikaia.54.1943

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Longitudinal Vibration-Control of Pipe String for Mining Manganese Nodules with an Elastic Support.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1998)

Yoshikazu Kobayashi Kazuo ASO

In order to reduce the longitudinal vibration of a pipe string for mining manganese nodules from deep sea floors, the pipe string was assumed to be supported by a linear or nonlinear spring at its upper part. The analyses of the longitudinal vibration and stress produced in the pipe string show that the linear-spring support itself tends to increase the resonance frequency of the pipe string as well as the resonance amplitude of buffer at the lower end of the string, while reducing the maximum axial stress of the pipe in case of the small spring constant. The hard-spring support strengthens this tendency and the soft-spring support tends to act reversely.

10.1299/kikaic.64.797

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Proliferating trichilemmal cyst with histological malignant transformation: Identification of hair sheath keratins in the tumor.

The Nishinihon Journal of Dermatology (1989)

Kazuo ASO Takako Shimoura Yutaka Hozumi Kenichi Yoshikawa

病理組織学的に悪性移行のみられたproliferating trichilemmal cystの1例を報告し, これまで転移の認められたmalignant trichilemmal cyst 13例を文献から収集, 自験例を考察した。定型的proliferating trichilemmal cystのmalignant移行部に接してherring-bone pattern状に増殖する紡錘型細胞も認められた。腫瘍からケラチンを抽出, 二次元ゲル電気泳動で56Kd(PI 7.8), 48Kd(PI 5.1), 46Kd(PI 5.1)ケラチンを検出した。いずれも外毛根鞘に特異に認められるケラチンである。表皮ケラチンは検出されなかつた。

Malignant Transformation

Hair disease

10.2336/nishinihonhifu.51.706

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Citations (3)

A Case of Sebaceous Nevus Developing a Variety of Sebaceous Tumors and Coexisting with Hibernoma.

The Nishinihon Journal of Dermatology (1991)

Kazuo ASO Takehiko Aoki Hideki Hashimoto Yutaka Hozumi

76歳, 女子の前頭部脂腺母斑にmultifocalにsebaceous adenoma(SA), sebaceoma(SO), superficial epithelioma with sebaceous differentiation(SESD), basaloid cell proliferation(BCP), basal cell carcinoma with sebaceous differentiation(BCSD), basal cell carcinoma (solid circumscribed type)の多様な腫瘍を併発, 腫瘍下層には褐色脂肪細胞の増殖像の認められた症例を報告した。症例での多様な分化性腫瘍, 褐色脂肪細胞腫の併発は, 脂腺母斑の潜在された多分化性腫瘍発症potentialを窺せると共に, またそれぞれの脂腺腫瘍—SA, SO, SESD, BCSDのhistogenesisでの関連性においても興味あるものと思われた。SOの概念を広く解釈して自験例のSA, SESD, BCSDをそれぞれSOのvariant型ともみなしうると考察した。

Histogenesis

Sebaceous carcinoma

Basal cell epithelioma

Sebaceous gland

10.2336/nishinihonhifu.53.1180

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Citations (1)

A Solution of Free Lateral Vibrations of a Pipe String Designed for Mining Manganese Nodules

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1989)

Shifeng YUAN Kazuo ASO Junji TANl

A mathematical description of free lateral vibrations of a pipe string, which is designed for mining manganese nodules in the deep ocean, leads to an eigenvalue problem containing a small parameter multiplying the highest derivative of its differential operator. This problem is analyzed by an asymptotic theory, de Groen's method, and natural frequencies and modes are evaluated. furthermore, The effects of internal fluid on the motion of the pipe string are investigated. It is shown that the algorithm developed is an effective one, providing highly accurate solutions even if only the zero approximation is used.

Derivative (finance)

10.1299/kikaic.55.2313

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Citations (1)

Static Behavior of a Pipe String Designed for Mining Manganese Nodules

JSME international journal Ser 1 Solid mechanics strength of materials (1990)

Shifeng YUAN Kazuo ASO Junji Tani

On the basis of linear beam theory, the static behavior of a pipe string designed for mining manganese nodules is formulated as a singularly perturbed boundary-value problem. This problem is analyzed by the method of matched asymptotic expansions and Galerkin's method. Static pipe deflections and bending moments are evaluated for the practical range of the towing speed of a ship. The pipe deflections obtained by Galerkin's method agree well with those obtained by the method of matched asymptotic expansions. However, it is found that Galerkin's method with the beam function is not effective in evaluating bending moments of the pipe string.

Towing

10.1299/jsmea1988.33.1_101

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Citations (2)

Dynamic behavior of a stepped pipe-string with a buffer at its lower end - behavior of a pipe string in mining manganese nodules (4th Report)

Kazuo ASO Katsushige KAN Shi Feng Yuan

Buffer (optical fiber)

Source

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Study on the Lateral Vibration of the Off-Shore Structure (2nd Report)

Journal of the Mining and Metallurgical Institute of Japan (1988)

Katsushige KAN Kazuo ASO

In order to make a simplified analysis on the lateral vibration of the off-shore structure constructed with four legs and a platform, the same method as one used in the first report was again applied in this analysis by replacing the structure with two-dimensional portal frame, evaluating its flexual rigidity and then by transforming the structure into the equivalent lumped-mass model. Furthermore, the validity of this method was examined by the model experiments carried out on two kinds of the 4 leg-structures.The main results obtained are as follows:(1) The natural frequency obtained by the simplified method which utilizes Theory (2) or Theory (4) proposedin this study, coincides with the experimental frequency within the error range that is about 0.06-5.47%.(2) As the ratio of the distance between legs and their span-lengths is smaller, the error of the natural frequency calculated by the above-mentioned method is more reduced and so its precision of calculation becomes higher. Therefore, the proposed method would be useful enough to analyse the natural frequency of the lateral vibration of the general offshore structure which has the small value of the above-mentioned ratio.(3) Furthermore, this method gives the fairly well estimated value with respect to the amplitude of lateral vibration of the structure, since the error involved in the estimation is only about 9-13% at the fifth period of vibration.

Rigidity (electromagnetism)

Natural frequency

10.2473/shigentosozai1953.104.1206_513

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COMPARISON OF PREKERATIN AND KERATIN MOLECULES IN HUMAN PLANTAR EPIDERMIS

The Journal of Dermatology (1984)

Yohtaro Katagata Kazuo ASO

ABSTRACT Keratin and prekeratin were extracted from human plantar epidermis and carried on SDS‐PAGE. Prekeratin in the basal as well as spinous cell layer of the epidermis was composed of 6–7 bands (M.W.: about 71,000‐49,500), while keratin in the surface of stratum corneum was composed of 3–4 bands (M.W.: about 66,500–53,000), indicating molecular modulation of prekeratin during epidermal cell differentiation. Amino acid compositions of prekeratin and keratin were similar, glycine, glutamic acid and serine being major three amino acids. Since the keratin molecule is known to be composed of a repeating amino acid sequence [Fuchs & Green: Cell , 15 , 887–893 (1978)], our result indicates that the modulation of molecular weight of prekeratin during differentiation might be due to enzymatic splitting of peptides of these structures.

Epidermis (zoology)

Keratin 6A

10.1111/j.1346-8138.1984.tb01439.x

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Citations (3)

The response of a long marine pipe string under parametric excitation.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1990)

Shifeng YUAN Junji Tani Kazuo ASO

A long pipe string hung from the ship in a mining system in the deep ocean may be parametrically excited when the ship undergoes a heaving motion. The vibration of the pipe string does not grow exponentially as in a linear case, but is limited by the nonlinear drag force of the sea water. In this paper, a theoretical analysis is presented to study this limit cycle response of a two-stepped pipe string with a buffer attached to its bottom end. The effect of the longitudinal oscillation of the pipe string is included. Furthermore, the equation of motion is formulated by considering the effect of the constant relative velocity between the sea current and the ship. It is found that the system is excited either only parametrically or both parametrically and directly, depending on whether the relative velocity is equal to zero or not. The steady-state oscillations are determined by the method of harmonic balance, and the stability of the solutions obtained is also investigated.

Harmonic

Oscillation (cell signaling)

Parametric oscillator

Drilling riser

Constant (computer programming)

Tension (geology)

10.1299/kikaic.56.2544

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