熔体的最大额定电流应超过熔断器的额定电流 这句话对吗 为什么?

Taking ultrasonic output power ultrasonic vibrating, temperature and preheating temperature on the factors, to melt solidification process by applying ultrasonic vibration experiment, the preparation of LC9alloy material tensile strength test, and obtained the tissue microstructure and Jing Liping were measured diameter comparison. At the same time and not by applying ultrasonic vibration to the melt solidification experiment are compared. Through the experiment can be analyzed to yield optimum performance of the alloy preparation conditions. The results show that: the ultrasonic vibration is applied to contribute to LC9alloy primary phase refinement and spheroidization; ultrasonic output power of 300W, ultrasonic vibrating temperature is 640 ℃, preheating temperature is 200 ℃is the more ideal technology parameters.

首先,你这句话就有问题.
非结晶的聚合物,其构象一直都是出于变化之中,结晶的聚合物由于构象被晶格锁住,而不能运动.
这里说明一点.构象,与链段运动是本质完全不同的两个概念!
在溶液时,由于溶剂的作用,分子链之间的距离很远,因此构象由一种变为另一种所需要的能量降低,一次变得容易了!
在熔体或橡胶态时温度提供了构象变换所需要的能量.
不同的状态,构象的某一种所占的比例是不同的.

不同型号的熔断器具有不同的保护特性,一般我们认为的只是作为短路或连续过载进行保护.熔断器熔体额定电流的确定原则主要是根据负载的容量和负载的性质来确定的.
1、对于变压器、电炉和照明等负载,熔体的额定电流应略大于或等于负载电流.
2、对于输配电线路,熔体的额定电流应略小于或等于线路的安全电流.
3、对于电动机负载,因其启动电流较大,一般可按照（1.5——2.5）倍额定电流选择.
4、对于多台电动机负载的短路保护,熔体的额定电流大于或等于（1.5——2.5）倍的最大电机额定电流,加上其余电动机的计算负荷电流.

原聚乙烯密度为0.957g/cm3可以知道原聚乙烯是属于第三类高密度聚乙烯,融化后结成块状固体的密度只有0.805g/cm3分析固状块物内形成了多孔,从而使密度降低.可能是以下原因产生的：
1,融化前没有对聚乙烯进行烘干,融化凝固过程中水分汽化使固体内成多孔.
2,颗粒状聚乙烯纯度不够,内有挥发性物质,高温融化时挥发性物质汽化使固体内成多孔.

Casting machine casts the principle:
One,heats up the raw material solid process material tube in,loses the pass,the compaction,cuts,the mix,causes to melt the bodythe temperature equalization,the viscosity equalization,the densityequalization and the material component equalization,causes thematerial to mount the ball condition transformation from the glasscondition process for to mount the fluid state.
Two,must complete before the injection in the raw materialplasticizing process the measurement procedure,because the polymerheat engine characteristic had decided models the process is inadvance the heat energy input and the switching process,models theprocess in advance the heat energy input way as follows:
1.The material tube heats up through the electric heating part,expects in the tube the material to absorb exterior heating throughthe heat conduction to cause it to soften and to fuse.
2.The material depends on the screw rod to revolve causes themechanical energy to transform into the heat energy,through cuts themechanism and the friction mechanism,heats up oneself,causes it tofuse.
3.The material heats up through 1,2 ways union.In exterior thematerial tube a material plastified part depends on passes on the heatconduction,another part depends on the screw rod to revolve cuts theenergy to control the material the plastified process and theplastified quality.
Three,casts the sufficient mold:Injects the sufficient mold stage isthe screw rod in the injection cylinder thrust force function,ChuLiaoshi in melt body after spray nozzle,mold flow channel,pouring into cavity.When injection,establishes the intensity ofpressure in the screw rod forehead melt body to call the injectionpressure; The screw rod advances the melt body the speed to call theinjection speed,its calls the injection speed; Its travellingschedule called the injection travelling schedule,with models thetravelling schedule in the value with to call in advance themeasurement travelling schedule is consistent.In the injection stage,must cause the melt body establishment enough speed and the pressurehead,can complete the sufficient mold process,the guarantee productquality.
Four,guarantees the pressure to make up shrinks:After the injectionstage completes,the essential process continues to maintain under thepressure function,in the cavity melt body obtains because of coolsmakes up shrinks,the product obtains the compression with to increasedensely.Guarantees presses the pressure,may maintain the originalinjection pressure (an injection pressure),also may reduce mayenhance the original injection pressure,forms two,three level or themultistage pressure.Guarantees presses the stage the characteristicis melts the body to flow under high pressure idling speed,the screwrod has small makes up shrinks the displacement,the materialincreases ambassador along with cooling and the density the productgradually to take shape,guarantees presses the pressure to holdarrives in succession frozen seals up to.

说“熔体的额定电流”是不对的,它指的是熔断器壳体的容许电流,而不是“熔芯的额定电流”.如果熔芯的额定电流为22A,则线路可以在不超过22A长期工作.

高聚物的熔体流动和常规的液体区别不大,毕竟高聚物处于粘流态嘛.
不过由于分子量比较大,范德华力比较大,流体的粘度比较大,导致流动速率可能较为缓慢.

熔体流动速率(MFR)是指在一定的温度和压力下,聚合物在单位时间内通过规定孔径的量,用g/min来表示熔体流动速率.一般来说,同一类的聚合物如聚乙烯,聚合度越大即分子量越大,它的熔体流动速率越小；同样分子量的聚合物,由于它们的化学结构不同,它的熔体流动速率也不一样,这主要跟它们分子间的滑动系数有关.

导体通电发热,Q=0.24 I^2*R*t
熔断体熔断的直接因素是产生的热量,热量一定时,有：
t=Q/0.24 I^2*R
答案是：与电流的平方成反比 .

这种专业翻译要付费的吧.LZ还是找专业翻译机构保险些.

熔体额定电流应小于明敷导线长期连续负荷允许载流量1.5倍!215/1.5=143.3333.所以应该用150A的熔体做短路保护

熔断器的额定电流:
是熔断器座的额定运行电流,运行电流只能小于等于该值
熔体的额定电流：
熔断器内熔丝的额定运行电流,也就是你熔断器所保护的电流,超过的话,熔断器就会熔断
熔体的极限的分段电流：
熔体所能分断的最大短路电流,该熔体只能分断小于等于这个值的短路电流

是10千瓦,不是10千伏.
三相电机的额定电流 I=P/（√3×U×cosφη）=10/（1.732×*0.38×0.85×0.85）≈22A.（P为额定功率,单位：KW.U额定电压0.38KV.cosφ为功率因素.η为效率.当铭牌上未提供cosφ和η时,均可按0.85估算）.
电流=10÷1.732÷0.38÷0.8÷0.85≈22A
保险稍大（1.2倍）,选用25A的.OK!

熔体的额定电流计算值：额定电流14A*（2-2.5）倍 （熔体选用30-40A）

解题思路：FeCr₂O₄和O₂发生反应过程中，FeCr₂O₄失电子数和O₂的得电子数是应该相等的．

FeCr₂O₄和O₂发生反应过程中，FeCr₂O₄失电子，Fe和Cr的氧化态都转化为+6价，失电子数目是（6-2）+2（6-3）=10，设得到这些电子需要的氧气的物质的量是n，则2n（2-0）=10，解得n=2.5mol，故选B．

点评：
本题考点： 氧化还原反应的计算．

考点点评： 注意电子守恒法在解决氧化还原反应过程中的应用是解题的关键，难度不大．

当某一种物体在外介温度达到其熔点时所熔解的叫熔液,比如炼钢炉加入矿石,炼出钢水.当某种固体在外介温度高于其凝固时所溶解的叫溶液,比如冰块溶解出来的水叫溶液.

溶液粘度何其流体力学体积有关,熔体粘度和分子量,分子量分布,分子枝化,加工条件有关,溶液粘度用乌氏粘度计或者奥氏粘度计（不推荐）测量,熔体粘度用毛细管流变仪,转筒粘度计,落球法,锥板黏度计都可测,熔体粘度分为实际粘度,零切粘度,表观粘度,稠度等多种表征,溶液粘度用特征粘度来表征,望采纳 ,谢谢

1 A 2 C
熔断器的额定电流实质上就是熔断体的额定电流,它是由熔断器各部分长期工作时的容许温升决定的.熔体的额定电流则决定于其最小熔化电流,对于电炉和照明等电阻性负载,可作为过载保护和短路保护,熔体的额定电流应稍大于或等于负载的额定电流,一般可按负载电流的1.1.5倍选择.例如架空线路采用熔断器做短路保护时其熔体额定电流应小于等于明敷绝缘导线长期连续负荷允许载流量的1.5倍,铅锡合金熔丝的熔断电流是额定电流的1.5倍;而铜丝熔体则是2倍;锌制的熔片却是1.2.1倍左右.
万用表这是常识,你把它记住就好了

对头,它是利用K的沸点低于KCl、Na、NaCl的沸点,使K+与自由电子结合在一起变为蒸气离开体系,反应平衡得以正移.

离子熔融体中原子之间以离子键作用.而离子键之间作用力的大小和 离子半径大小和离子所带电荷多少有关.
一般来说,离子所带电荷越多,离子键越强.
离子半径越大,离子键越弱.

3 welds trace plastic melts body in charge type process,two strand of the trace forming a weld each other right away to melting experiencing and observing the confluence place.Because of the existence making piece of weld trace,not only mass,moreover effect affecting the outward appearance making a piece makes piece of intensity,that place is when being put into use easy to break.The creation making piece of weld trace currently to thin-wall in molding process and their main influencing factor theory go into is also more ,for instance,Yuan Guo Ding ,Hu Shu Guang ,Han Yang Fei of Jiangsu university are not that the Newton Hele one Show fluid model and the power law spend a model suddenly or CrosS spends the model ,the analysis making use of Moldnow suddenly [28] grade by the fact that building-up is not isothermal ,the model analyses by the fact that running gate location carries out a stream on clausura,forecast air bubble location and weld trace location that system there exists in piece of possibility,To ascertain the best running gate location and quantity,and outer covering and mobile telephone front shell etc.produces plastic articles by injection moulding with the camera the product has carried out analytical verification ,has got fairly good effect.The creation the result studying being indicated ,melting receiving trace is connected with the temperature mainly,under low-temperature situation,the polymer melts body's flow ,confluence function lessening,phenomenon easy to produce weld trace.Melting experiencing and observing cities such as have charge the model temperature low ,have charge model time shortly ,have injected pressure and guaranteeing pressure low makes products have the inclination producing weld trace.Another ,products physical design are unreasonable ,the mould exhausts no smooth wait to be also to affect products producing weld trace cause.Controlling making the piece of weld trace defect therefore ,with regard to,not bad the body charge the model temperature ,the mould temperature ,charge model time by the fact that rational controlling melts,control as well as molding factors such as injecting pressure and guaranteeing pressure is in progress to the person.
4 crack plastic makes piece of the crack creation and remains strain in relation to ,the time cooling down in the process of molding like the thin-wall part is extremely short,in general being in several seconds or shorter time,elasticity releases the feasible high polymer too late but produce remains strain,make the result that strain releases after dying sinking piece will increase by making the inclination producing buckling defects such as deformation ,dehiscence piece.The thin-wall part produces the crack effect handicraft factor to plastic ,also has many relevances go into ,the Taiwan wc at present at home and abroad.BushLko and vK.stokes.1291 has studied the molding technological parameter ,has indicated if the impact of the mould temperature ,melting experiencing and observing the temperature ,guaranteeing pressure and moulding piece of wall thickness and so on over system document contraction and remains strain,studies result,guaranteeing pressure is to affect a product contracting the deformable key factor ,that the mould composes in reply the body temperature melting is that effect is less ,guarantees pressure feeling smaller ,as high ,contracting deformation more but.Israel s.One David and M.omerl30] testify Kenig ,A.Ben by the fact that the experiment has studied the impact of pressure maintaining parameter and running gate geometry dimension over end item dimension stability,bears fruit ,under same mould pressure situation,the small running gate contraction deformation effect to making a piece is less ,big running gates produce plastic articles by injection moulding under constant pressure situation,being contracted a dimension homogeneously consistently impossibly.

应该是研究形成熔体的地质环境、年代、原因

聚合物熔体的弹性,应该属于粘弹性,主要原因应是较高的分子量以及分子链的空间构型.

熔体的额定电流是指正常工作时,在这个电流的以下可以长时间通电,极限分断电流是熔断短时间内分断电路的最小值.

具体详细公式不知道,只是建议熔体额定电流最大值为不能超过15A.

聚丙烯熔体密度,与聚丙烯品种密度有关,牌号不同,物理,机械性能不同,用处不同.
聚丙烯 polypropylene
丙烯的聚合物.英文缩写PP.熔融温度约174℃,密度0.91克/厘米3.强度高,硬度大,耐磨,耐弯曲疲劳,耐热达120℃,耐湿和耐化学性均佳,容易加工成型,价格低廉,因此是产量大(1990年世界年产量已逾500万吨)、应用广泛的通用高分子品种.

PVC材料是塑料装饰材料的一种.PVC是聚氯乙烯材料的简称,是以聚氯乙烯树脂为主要原料,加入适量的抗老化剂、改性剂等,经混炼、压延、真空吸塑等工艺而成的材料.
pvc的熔体温度就是聚氯乙烯在熔化状态下的温度.

就是熔断器开断电流和开断所需时间的特性曲线

熔断器的额定电流指这个熔断器最多可以允许通过的最大电流,而这个熔断器中可以放置额定电流小于或等于熔断器额定电流的不同规格的熔体,熔体的额定电流指通过这个熔体的最大电流,这样说可能你有些不明白,举个例子：一个鞋子40码,里面可以放小于或等于40码的鞋垫,而大于40码的鞋垫不能放,现在,熔断器指的是鞋子,鞋垫就是熔丝.就是说,当熔断器的额定电流是40A时,这里面可以放额定电流小于40A的熔体,当熔体的额定电流为50A时,就不允许放进这个熔断器中.熔断器是指放置熔体的装置.