30 research outputs found
The Production of Experimental Exophthalmos in Gold Fish
Gold fish (Carassius auratus, var. japonicus) were used for the demonstration of the exophthalmos-producing
substance in the serum of a patient suffering
from thyrotoxicosis with exophthalmos. The exophthalmic
response of the fish was determined by measuring
the intercorneal distance by the use of a micrometer
before and after the injections of test materials, and
the percentage change in that distance was calculated.
The responsiveness of the fish was partly controlled
by the injections of normal saline. normal human
serum. and commercially prepared anterior pituitary
hormone with and without prednisolone added.
The normal saline injection did not provoke any
resonse in fish. The normal human serum produced
transient enophthalmos. whereas the serum from a
patient suffering from toxic goiter with exophthalmos
produced definite exophthalmos.
The anterior pituitary hormone elicited marked exophthalmic
response. There was no correlation between
the degree of response and the dosage level of the
hormone used.
Addition of prednisolone to this hormone preparation
seemed to inhibit the exophthalmogenic effect of the
anterior pituitary hormone.
This method of the production of experimental exophthalmos
in gold fish might be used for the demonstration
of the exophthalmos-producing substance in the
serum of the exophthalmic patient
Single or several crime and compound or concurrent crimes on the illegal acquisition and use of another personβs credit card
Separation of investigation and prosecution for implementation of presidential election pledge and national affairs
Numerical Study on Vertical Stress Estimation for Panel Pillars at Room and Pillar Mines
λ³Έ μ°κ΅¬μμλ 3μ°¨μ μ νμ°¨λΆλ²(FDM) νλ‘κ·Έλ¨μΈ FLAC3Dλ₯Ό μ΄μ©νμ¬ μ£Όλ°©μ μ±κ΄μ₯μ λͺ¨μ¬νκ³ μ±κ΅΄μ νμ±μ μν νμ§μλ ₯ κ΅λμΌλ‘ κ΄μ£Όμ μ§μ€λλ μμ§μλ ₯μ λ³νλ₯Ό λΆμνμλ€. μ€μ°¨μ¨κ³Ό ν΄μμκ°μ κ³ λ €νμ¬ μ μ ν μ‘°ν©μ μμλ§ ν¬κΈ°λ₯Ό μ μ νκ³ μ§λ₯λ‘ μλ°μ λͺ¨μ¬νμ¬ μμλ§ μ‘°ν©κ³Ό κ°λ° μ¬λμ λ°λ₯Έ ν΄μ μ±λ₯μ κ²μ¦νμλ€. λ³Έ ν΄μμμλ κ°λ° μμ λ΄μ 1κ°(1Γ1)~ 121κ°(11Γ11)μ ν¨λ κ΄μ£Όκ° μμ±λλλ‘ μ±κ΅΄μ μ νμ±νμ¬ κ°μ₯ λμ μμ€μ μλ ₯μ§μ€μ΄ λ°μνλ μ€μλΆ κ΄μ£Όμ μλΆ μνλ¨λ©΄μ μμ©νλ μμ§μλ ₯μ μΈ‘μ νμλ€. 40 m~320 mκΉμ§ 40 m λ¨μλ‘ κ΅΄μ°©μ¬λλ₯Ό λ³κ²½νμ¬ λμΌν κ³Όμ μ λ°λ³΅ μννμλ€. ν΄μ κ²°κ³Ό, κ°λ° κ·λͺ¨(NP)κ° ν΄μλ‘, κ°λ°μ¬λ(HOB)κ° μμμλ‘ μ€μλΆ κ΄μ£Όμ μμ§μλ ₯ κ°μ΄ μ§λ₯λ‘ μΆμ κ°μ κ°κΉμμ§λ κ²μ νμΈνμλ€. λν, κ°λ° κ·λͺ¨κ° μκ³ λμ¬λμΈ κ²½μ°μλμ§λ₯λ‘ μ μν μΆμ μ μμ§μλ ₯μ΄ κ³Όλνκ°λ μ μμΌλ©°, λμΌν κ°λ°κ·λͺ¨μΈ κ²½μ° μ¬λκ° μ¦κ°ν μλ‘μμ§μλ ₯κ³μ(VSF)κ° μΌμ ν κ°μΌλ‘ μλ ΄νλ κ²½ν₯μ΄ μμμ νμΈνμλ€.
This paper examines the vertical stress change concentrated on mine pillar which occurs due to the stress disturbance from opening excavation at room and pillar mine by FLAC3D, a finite difference method (FDM) software. The mesh size combination is decided with a careful consideration of relative error and run-time, then its performance is verified. A series of numerical analyses is conducted and the vertical stress at central pillar was observed for the test cases of 1Γ1 to 11Γ11 mine pillars, 40 m to 320 m depth with 40 m difference. The results show that the vertical stress of pillar approaches to the similar value with the value estimated by tributary area theory(TAT) when the development area (NP) is increased or the height of overburden (HOB) is decreased, while it is overestimated in the opposite case. Furthermore, it also represents that the vertical stress factor (VSF) converges to a specific value when the depth is increased whille keeping the development area identical.N