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与电子皮带秤相比,核子秤具有哪些优点?

答案

参考答案:

电子皮带秤是采用压力传感器及速度传感器与微机组成的接触式的自动称量设备,其动态精度可达1.5%。但由于是接触式的,它要受皮带颠簸、超载、滚轮偏心、皮带张力变化和刚度变化等因素影响,又由于采用的是压力传感器,其器件本身的精度受温度影响较大,且不适合于工作在高温度、高粉尘、强腐蚀等恶劣环境中,实际使用证明,现有通用电子皮带秤的动态运行准确度没有保证。使用中需不断地对电子秤进行调整,否则会产生系统偏差。由于它需要经常校正、维护和维修,给计量工作带来繁重的负担,并且不能保证长期稳定、可靠地工作。核子秤由于采用非接触式测量技术,并充分利用现代计算机及电子学的最新成果,它克服了传统电子秤的缺点。

其特点如下:

①根据γ射线穿过物料时其强度按指数规律衰减的原理,对输送机上传送的各种物料累积重量、流量进行非接触式在线测量。

②不受皮带磨损、张力,振动,跑偏冲击等因素影响,能长期稳定、可靠地工作。

③利用高新技术和特殊工艺制造的传感器具有极高灵敏度,可在高温、多尘、强电磁干扰、强腐蚀等恶劣环境下可靠运行。

④除皮带输送机外,还适用于电子秤不能应用的场合,如螺旋、刮板、链板、链斗等各式输送机。

⑤测量秤架安装只需很少的空间,不需要对原设备进行改造。

⑥系统高智能化,操作非常简单,安装标定后,全部维护工作可由按键完成,正常工作下可无人值守。

⑦可用标准吸收校验板方便地对系统精度进行检测。

⑧可随时显示物料重量、负荷、流量,自动打印在某一时刻的累积量。

⑨具有漂移补偿及源衰减补偿功能,系统长时间运行稳定可靠。

⑩由于放射源的强度低,同时系统具有可靠的防护措施,这就保证了在秤架之外的放射剂量远低于国家公众人员防护标准。

完形填空
A noted American psychologist once remarked that childhood is a magical period in one’s life.Indeed it is, for during        one undergoes a step-by-step transformation not only in mental capacity, but also in physical and verbal skills.Each step         an increase in the difficulty of a child’s conceptual and learning abilities.During the early stages of childhood, from infancy to about five, the child learns         skills including using the toilet, bathing and dressing himself independently.At this stage, he also learns to be very observant, curious, imaginative and creative.His ability to remember things also       at this stage. He remembers details that an adult may have difficulty in remembering.Gradually , he learns elementary skills in problem-solving.At school, particular in        classes, the child is especially creative.Given a piece of paper and some colored pencils, he draws a variety of        from his surroundings as well as from his          circle.It is not surprising to see a child draw a monster to represent an abusive father, and an angel to represent a loving and caring mother.
As he graduates to the later stages of childhood bordering on the teenage years, the child learns the          of human relations and socialization by interacting with his peers—his friends and schoolmates. He also learns to         with new life situations, including dates and part-time work. Given a tight schedule of schoolwork, the child learns to prepare his own schedules of work and play; the more________ and less serious ones manage to take time out of their busy schedules of assignments, reports and tests and examinations to go with their friends on relaxation entertainment.
小题1:
A.adolescenceB.adulthoodC.childhoodD.infancy
小题2:
A.signsB.presentsC.preventsD.signals
小题3:
A.difficultB.simpleC.usefulD.helpful
小题4:
A.developsB.increasesC.reducesD.strengthens
小题5:
A.musicB.artC.chemistryD.biology
小题6:
A.picturesB.buildingsC.reflectionsD.images
小题7:
A.familyB.schoolC.teacherD.friend
小题8:
A.competenceB.commitmentC.complexityD.competition
小题9:
A.agreeB.experimentC.withdrawD.concern
小题10:
A.practical B.cautiousC.enthusiasticD.stubborn
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