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麦兜籹籹

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灰黄霉素(绿) ,是一种口服抗生素抗真菌新药。它广泛用于治疗真菌疾病的皮肤,头发和指甲。它有一个非常有限的水溶性( 15 μ g / ml的,在37 ° C时),结果在一个小的吸收,从消化道,生物利用度低的情况以及面临的问题与安全及效率,因为其治疗剂量相当接近,其毒性极限。有效途径,以增加溶解度和生物利用度的药物和其吸收,从消化道是微细化的毒品成细颗粒。据确认,由观察对阿特金森等。 [ 1 ] ,随着增加,在特定领域的粒子,从大约0.4 (平均颗粒直径为10 μ m )至1.5 (平均粒径为2.7 μ m )中,有效地吸收绿,几乎翻了一番。克拉姆尔等人。 [ 2 ]还发现,一种0.5克剂量的微细化石墨生产的血清各级区分那些由1.0克剂量nonmicronized绿。一些技术,如喷雾干燥,气流粉碎,重结晶等,可以通过编写微细药物粒子。主要缺点的,这些技术是粒子具有广泛的粒度分布( 0.5-25 μ m )的,是得到了时,一小部分在微米或纳米范围内产生,即颗粒大小,粒度分布和形态,不能有效地控制[ 3 ] 。此外,该现象化学降解性及生物活性的损失会发生当他们在微细化,由传统技术由于名额有限,化学和热稳定性大部分药物。近年来,一些超临界流体( SCF的)技术的出现,有吸引力的方法,药物粒子形成。最典型的矛盾问题,这些都是快速扩张超临界解决方案(应力)过程[ 4-6 ]和超临界抗溶剂( SAS )的过程[ 7,8 ] ,其中利用的具体特点的超临界流体,如强烈的溶剂功率大,扩散率,低粘度和表面张力。

中英文翻译机械类

139 评论(14)

天晴0608

研究的可靠性评估方法与积极的管道腐蚀缺陷摘要: 研究概率的方法来估算剩余寿命的压力管道腐蚀缺陷含有积极的可靠性评估是.进行使用一些已经公布的失败压力.稳态腐蚀速率假定估计增长腐蚀.层面的第一次二阶矩可靠性迭代法,蒙特卡罗一体化技术及一阶泰勒级数展开的极限状态函数(该组织)的使用,以便估计失败的概率各腐蚀缺陷随着时间的推移。

230 评论(9)

小冷0623

MECHANICAL PROPERTIES OF METALS金属的机械性能 Mechanical properties are the characteristic responses of a material to applied forces. These properties fall into five broad categories: strength, hardness, elasticity, ductility, and toughness. 金属的机械性能是金属受到外力作用时所表现出来的特征。这些性能主要分为五类:强度,硬度,弹性,塑性,韧性。Strength is the ability of a metal to resist applied forces. 强度是金属承受外加力的能力。Strength properties are commonly referred to as tensile strength, bending strength, compressive strength, torsional strength, shear strength and fatigue strength. 强度性能一般涉及到抗张强度,弯曲强度,耐压强度,抗扭强度,切变强度和疲劳强度。Tensile strength is that property which resists forces acting to pull the metal apart. It is one of the most important factors in the evaluation of a metal. 抗张强度是金属抵抗被分离的能力(性能)。是评价金属的重要因素之一。Compressive strength is the ability of a material to resist being crushed. Compression is the opposite of tension with respect to the direction of the applied load. Most metals have high tensile strength and high compressive strength. However, brittle materials such as cast iron have high compressive strength but only a moderate tensile strength. 耐压强度是金属抵抗被压碎的能力(性能)。压力是张力的反方向外加负载。大部分金属具有较高的抗张强度和较高的耐压强度。但是,像铸铁这种脆金属虽有较高的耐压强度,却只有较中等的抗张强度。Bending strength is that quality which resists forces from causing a member to bend or deflect in the direction in which the load is applied. Actually a bending stress is a combination of tensile and compressive stresses. 弯曲强度是金属抵抗所受负载方向的弯曲和倾斜的能力(性能)。实际上弯曲应力是压力和张力的综合。Torsional strength is the ability of a metal to withstand forces that cause a member to twist.抗扭强度是金属抵抗被扭转的能力(性能)

308 评论(10)

雅婷0302

电动起锚系缆绞盘Electric anchor winch cable line液压绞盘 Hydraulic windlass液压起锚机 液压绞盘 Hydraulic windlass hydraulic windlass 电动液压起锚绞盘Electrically operated hydraulic pressure anchor capstan 电动起锚绞盘Electrically operated anchor capstan 起锚系缆绞盘Raises anchor the lashing rope capstan

102 评论(12)

小川里沙

Shear strength refers to how well a member can withstand two equal forces acting in opposite directions. Fatigue strength is the property of a material to resist various kinds of rapidly alternating stresses. For example rod or an axle undergoes complete reversal of stresses from tension to compression. Bending a piece of wire back and forth until it breaks is another example of fatigue strength. Hardness is that property in steel which resists indentation or penetration. Hardness is usually expressed in terms of an indentation made by a special ball under a standard load, or the depth of a special indenter under a specific load. Elasticity is the ability to spring back to original shape. Auto bumpers and all springs should have this quality. Ductility is the ability to undergo permanent changes of shape without rupturing. Modern deep-formed auto bodies and fenders, and other stamped and formed products must have this property. Toughness is the ability to absorb mechanically 剪切强度是指如何成员可以承受两个平等的力量在相反的方向。 疲劳强度是财产的材料,抵制各种压力迅速交替。例如棒或车轴进行彻底扭转强调从紧张的压缩。弯曲的一块铁丝网来回,直到休息,是另一个例子疲劳强度。 硬度是钢中的财产而抗拒压痕或渗透。硬度通常是在一个压痕所作的一个特殊球下一个标准的负载,或深度的一个特殊压根据具体的负载。 弹性是有能力春天回到原来的形状。汽车保险杠和所有泉水应该有这个素质。 延性是有能力进行永久性的变化形状不断裂。现代深海形成汽车机构和挡泥板,以及其他印,形成的产品必须有此属性。 韧性是能够吸收机械

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