On Some Characteristics of Sloshing Force

Hagiwara, K; Yamagata, Shunsuke; Itaya, Tetsuhide; Yamashita, Masahiro

doi:10.2534/jjasnaoe1968.1977.142_290

Cited by 3 publications

(2 citation statements)

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“…(29), te can not be obtained in a closed form, but it is not so difficult to get 7, 6 and a, and those parameters ought to be decided experimentally at the present.…”

Section: Basic Information and Premised Conditionsmentioning

confidence: 99%

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On Sloshing Force of Rectangular Tank Type LNG Carrier

Hagiwara¹,

Hori²,

Kawamura³

et al. 1979

J. SNAJ, Nihon zousen gakkai ronbunshu

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SummaryMany researches have been reported on sloshing forces of liquid in a ship tank. But most of them have focused on results of experiments and only a few researches have been reported about methods of evaluation of sloshing load on actual ships. In the previous report, the results of the model tests focused on sloshing phenomena of a nearly fully loaded tank which has a large flat tank top were presented. In this report, the authors present the method of evaluation of impulsive pressure on actual ships taking into account the characteristics of the phenomena, that is, scattering of impulsive pressure in regular ship motion and non-linear relation between the amplitude of ship motion and impulsive pressure.The following assumptions were made : (1) The probability distribution of impulsive pressure in regular ship motion conforms to Weibull distribution. (2) The magnitude of pressure varies in a relation between 0 and 2nd power of amplitude.

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“…(29), te can not be obtained in a closed form, but it is not so difficult to get 7, 6 and a, and those parameters ought to be decided experimentally at the present.…”

Section: Basic Information and Premised Conditionsmentioning

confidence: 99%

“…(3) is also considered a stochastic variable, and if we take the 1/n exceedance of the pressure as a significant value, it is obtained from Eq. (3), as follows, ( 6 ) where koz denotes the exceedance value of k. And him can be calculated by Eq. (5) as follows, ( 7 ) Putting Eqs.…”

Section: Basic Information and Premised Conditionsmentioning

confidence: 99%

On Sloshing Force of Rectangular Tank Type LNG Carrier

Hagiwara¹,

Hori²,

Kawamura³

et al. 1979

J. SNAJ, Nihon zousen gakkai ronbunshu

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Impairment of endothelium-dependent vasodilation induced by acetylcholine and adenosine triphosphate following experimental subarachnoid hemorrhage.

Nakagomi¹,

Kassell²,

Sasaki³

et al. 1987

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116

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The effect of subarachnoid hemorrhage (SAH) on endotbelium-dependent vasodilation of isolated rabbit basilar artery was examined using an isometric tension recording method. Thirty-five rabbits that had 2 successive blood injections were divided into 3 groups: normal animals (control), 4 days, and 3 weeks after the first SAH. Acetylcholine (ACh) (10~6-10~4 M) and adenosine triphosphate (ATP) (10~6-10~4 M) were used to evoke dose-dependent vasodilation of isolated arterial rings previously contracted by 10~6 M serotonin. In the animals killed 4 days after the first SAH, both AChand ATP-induced relaxation were suppressed, and the degree of relaxation of this group was 38 ± 4.5% (mean ± SEM) and 22 ± 3.9% of the initial contractile tone in response to 10" 3 Despite extensive efforts to identify measures to dilate the narrowed arteries, no reliable measure exists for preventing vasospasm from developing or for reversing it. One of the major reasons for this inadequacy is a lack in understanding the pathogenesis of vasospasm. The cause of cerebral vasospasm following SAH is likely to be multifactorial.It has been recently suggested that impairment of the vasodilatory activity of cerebral arteries following SAH may play an important role in the pathogenesis of vasospasm. Arterial wall prostacyclin, a powerful vasodilator, decreases progressively following SAH. 8 It is well documented that endothelial damage occurs frequently after SAH. We have recently demonstrated that endothelium-dependent vasodilation induced by adenosine triphosphate (ATP) is impaired after SAH in a rabbit single hemorrhage model (T. Nakagomi, unpublished data). However, acetylcholine (ACh)-induced vasodilation was well preserved following SAH in that model. This may reflect a partial, less severe damage to the endothelium. The present experiments were conducted to investigate 1) the effect of SAH on endothelium-dependent vasodilation induced by ACh and ATP in a rabbit double hemorrhage model, which should result in more severe damage to the endothelium than a single injection model, and 2) to study the inhibitory effect of hemoglobin on endothelium-dependent vasodilation in basilar arteries exposed to SAH. Materials and Methods Animal PreparationsThirty-five male New Zealand white rabbits weighing 2.9-3.4 kg were anesthetized with an i.m. injection of ketamine (20 mg/kg), xylazine (5 mg/kg), and acepromazine (0.25 mg/kg) in a ratio of 8:1:1. The animals were intubated and received muscular paralysis with i.v. pancuronium bromide (0.08 mg/kg). Ventilation was maintained with a Harvard dual-phase control respirator. In each animal, the left ear artery was cannulated for monitoring blood pressure and withdrawing arterial blood.A 23-gauge butterfly needle was inserted into the cisterna magna percutaneously and connected to a pressure transducer via one outlet of a three-way stopcock. The other outlet was used for the injection of arterial blood. Intracranial pressure (ICP) was monitored immediately after the injection of arterial blood through the st...

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