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pressure drop
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  相似匹配句对
     pressure;
     压力;
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     Peer Pressure
     同龄压力
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     (3)timely and effective decompressive craniotomy to decrease intracranial pressure;
     (3)及时有效的开颅去骨瓣减压,降低颅内压;
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     (8)moderate the fluid intake,dehydration and diuresis to decrease intracranial pressure.
     (8)适度限液、脱水利尿降颅压。
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     drop.
     drop,第1天。
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A theoretical analysis of the laminar flow in the annular space bounded by two concentric tubes with small injection and suction through the porous walls is presented in this paper. By using a similarity transformation, the Navier-Stobes equations in the cylindrical co-ordinates for the steady incompressible flow are reduced to an ordinary non-linear differential equation of the third order. With appropriate boundary conditions, this equation is solved by the method of small perturbation. The results show that...

A theoretical analysis of the laminar flow in the annular space bounded by two concentric tubes with small injection and suction through the porous walls is presented in this paper. By using a similarity transformation, the Navier-Stobes equations in the cylindrical co-ordinates for the steady incompressible flow are reduced to an ordinary non-linear differential equation of the third order. With appropriate boundary conditions, this equation is solved by the method of small perturbation. The results show that the velocity of injection or suction and the two radii of the annulus affect considerably the velocity profile, the pressure drop in the flow direction and the friction coefficients at the walls. When the suction is applied only at the inner tube the position of the maximum velocity moves inward. The friction at the inner wall consequently increases and that at the outer wall decreases. It is also found that in the case considered the suction reduces the pressure drop in the flow direction.

本文对具有微量吸吮或吹注的二同轴心圆管间的层流流动问题进行了理论分析。利用相似转换,将不可压缩流体,定常运动,柱坐标形式的纳非尔-斯托克司方程组简化为一三次非线性常微分方程,运用小参数法及适当边界条件求出此方程的解,结果表明,吸吮或吹注对流动的速度分布,沿流程压力下降和摩擦系数均有显著影响,其影响的大小,依赖于吸吮或吹注的性质,程度及二圆管的相对尺度。当内管壁具有吸吮而外管壁的吸吮为零时,最大速度的位置将向内移,随之,内管壁的摩擦系数值增加,而外管壁的摩擦系数值减小,同时,产生较小的沿流程压力下降。

Chrysanthemum indicum is effective in lowering blood pressure. Extraction with hot ethanol yielded an active fraction, HC-1. In anesthetized cats, intraduodenal injetions of 50—100 mg/kg of HC-1 produced an average "% of hypotensive areas" in 2 hours varying from -19% to -22%. Four normotensive dogs were fed 50, 100, 130 and 150 mg/kg resp., and the diastolic pressure dropped 0, 24, 8 and 36 mm Hg resp. The hypotensive action was slow and lasted more than 2 hours. Three renal hypertensive dogs...

Chrysanthemum indicum is effective in lowering blood pressure. Extraction with hot ethanol yielded an active fraction, HC-1. In anesthetized cats, intraduodenal injetions of 50—100 mg/kg of HC-1 produced an average "% of hypotensive areas" in 2 hours varying from -19% to -22%. Four normotensive dogs were fed 50, 100, 130 and 150 mg/kg resp., and the diastolic pressure dropped 0, 24, 8 and 36 mm Hg resp. The hypotensive action was slow and lasted more than 2 hours. Three renal hypertensive dogs were fed daily 100 mg/kg in the first 2 weeks, and 200 mg/kg for the 3rd week. Weekly tests on EKG, serum BSP retention, and blood NPN revealed no serious alterations. In two of them the blood pressure was brought down significantly. Daily feeding of 300 mg/kg to one healthy dog for 3 weeks brought forth no grave reactions except vomiting at times. HC-1 is marked with (a) high yield, (b) low toxicity, (c) mild action, and (d) certain hypotensive effects in anesthetized and unanesthetized animals. So it may be recommended to clinical trial.

野菊花降压有效。本文实验用热醇提取出有效成分HC-1,并研究其疗效及毒性。麻醉猫小肠注射50—100毫克/公斤,2小时内的降压面积百分比为-19至-22%。正常血压狗4只,分别灌服50,100,130及150毫克/公斤,舒张压分别下降0,24,8及36毫米汞柱,作用缓慢,维持2小时以上。慢性肾型高血压狗3只,前2周每日灌胃100毫克/公斤,第3周每日灌胃200毫克/公斤。其中2狗血压显著降低。这3狗每周作心电图、血清磺溴酞钠存留率及全血非蛋白氮含量的测定,未见到严重毒性反应。另1只正常狗每日服300毫克/公斤,连续3周,除有时呕吐外,亦无其他严重毒性反应。 HC-1产量较高,毒性不大,作用缓和,对麻醉与不麻醉动物有一定降压效果,可以推荐临床试用。

The LD_(50) in mice was found to be 19.4 g/kg and 0.98±0.075 g/kg respectively for the infusion and crude extract of Chou-wu-tung, given by intravenous injections. The subacute toxicity is negligible when the infusion was crally administered to rats (0.25—2.5 g/kg/day) for 60 days, except that some animals showed quietness, slight fall of systolic pressure and soft stool. No apparent toxic effects were observed. A crude extract and infusion of Chou-wu-tung, when injected intravenously at respective dosages...

The LD_(50) in mice was found to be 19.4 g/kg and 0.98±0.075 g/kg respectively for the infusion and crude extract of Chou-wu-tung, given by intravenous injections. The subacute toxicity is negligible when the infusion was crally administered to rats (0.25—2.5 g/kg/day) for 60 days, except that some animals showed quietness, slight fall of systolic pressure and soft stool. No apparent toxic effects were observed. A crude extract and infusion of Chou-wu-tung, when injected intravenously at respective dosages of 50—100 mg/kg and 150 mg/kg, produced primary and secondary falls of blood pressure on anaesthetized rats and dogs, but with intramuscular injection or oral administration, only the secondary fall of blood pressure was apparent. This hypotensive effect might last for 2—3 hours. Intravenous injection of the decoction to anaesthetized animals produced only primary fall of blood pressure, the infusions of alcohol, ether and ,chloroform, given by the same route, did not lower the blood pressure. Twenty-eight renal hypertensive rats were divided into three groups, the first (11 rats) and the second (7 rats) groups were treated with the infusion at respective dosages of 0.5 g/kg/day and 5 g/kg/day, and the third (10 rats) with the crude extract at 50 mg/kg/day. The drug was given to all the rats for 2 weeks by oral administration. Hypotensive effect was observed in 3—10 days after medication, and became more remarkable in the second week of the therapeutic period or the first week after cessation of medication; the blood pressure dropped 57.4%. The blood pressure in most rats returned in 2 weeks, and in some rats in 2—4 days or 4 weeks after the stopping of medication.

1.本文就臭梧桐的一般性质作了实验性研究,结果证明其降血压成分易溶于水,难溶或不溶于乙醚、乙醇和氯仿,对热稳定,在碱性溶液中可被氯化钙沉淀出来。臭梧桐降血压效果可因产地而不同。开花前的和新鲜的臭梧桐降血压作用分别较开花后的和经长时间保存的要强。 2.臭梧桐毒性甚小,其热浸剂和提出物给小鼠静脉注射时半数致死量分别为19.4克/公斤和0.98±0.075克/公斤。给大鼠每天用热浸剂(0.25—2.5克/公斤)灌胃经60天,除少数动物出现安静、轻度收缩压下降和大便变稀外,未发现其他毒性反应。 3.臭梧桐提出物(50—100毫克/公斤)和热浸剂(150毫克/公斤)给麻醉大鼠和狗静脉注射时,可引起两度血压下降,但肌肉注射或经口给药,仅引起第二度降血压作用,其作用可维持2—3小时。静脉注射煎剂(麻醉大鼠和狗实验)仅出现第一度降血压作用,经口给药时无效。乙醚、乙醇和氯仿的浸出液不论静脉注射或经口给药,均不引起麻醉动物的血压下降。给肾型高血压大鼠每天经口投予臭梧桐热浸剂(0.5—5克/公斤)和提出物(50毫克/公斤)时,给药的第3—10天卽口出现血压下降,在给药的第二周和停药后的第一周,血压下降最明显,最大降血压作用可达原值...

1.本文就臭梧桐的一般性质作了实验性研究,结果证明其降血压成分易溶于水,难溶或不溶于乙醚、乙醇和氯仿,对热稳定,在碱性溶液中可被氯化钙沉淀出来。臭梧桐降血压效果可因产地而不同。开花前的和新鲜的臭梧桐降血压作用分别较开花后的和经长时间保存的要强。 2.臭梧桐毒性甚小,其热浸剂和提出物给小鼠静脉注射时半数致死量分别为19.4克/公斤和0.98±0.075克/公斤。给大鼠每天用热浸剂(0.25—2.5克/公斤)灌胃经60天,除少数动物出现安静、轻度收缩压下降和大便变稀外,未发现其他毒性反应。 3.臭梧桐提出物(50—100毫克/公斤)和热浸剂(150毫克/公斤)给麻醉大鼠和狗静脉注射时,可引起两度血压下降,但肌肉注射或经口给药,仅引起第二度降血压作用,其作用可维持2—3小时。静脉注射煎剂(麻醉大鼠和狗实验)仅出现第一度降血压作用,经口给药时无效。乙醚、乙醇和氯仿的浸出液不论静脉注射或经口给药,均不引起麻醉动物的血压下降。给肾型高血压大鼠每天经口投予臭梧桐热浸剂(0.5—5克/公斤)和提出物(50毫克/公斤)时,给药的第3—10天卽口出现血压下降,在给药的第二周和停药后的第一周,血压下降最明显,最大降血压作用可达原值的57.4%。多数高血压大鼠的血压在停药后的第二周恢复,少数在停药的2—4天或4周后恢复。

 
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