Function and function introduction:
Instrument introduction:
The device is an experimental device for determining the migration number of H+ ions by an interface method, comprising a migration tube for storing a test solution, the upper end of the migration tube is vertically inserted into the cathode electrode, and the lower end of the migration tube is vertically inserted into the anode electrode, the DC voltage measuring instrument and the power switch A series circuit is formed between the cathode electrode and the anode electrode, and a rubber plug is further disposed on the rubber plug at which the cathode electrode is inserted at the upper end of the migration tube, and the air outlet hole connects the inner cavity of the migration tube to the atmosphere, and a thermostatic device is installed outside the migration tube, so that The temperature of the test solution stored in the migration tube is uniform and stable, and the DC voltage measuring instrument is also connected in parallel with a standard resistance of the BZ3 type.
The battery (electrolytic cell) of the device uses an external DC voltage of 500mv (millivolt), that is, 0.5V (volt), which is safe. The use of environmentally friendly nickel (Ni) electrodes reduces environmental hazards. The ingenious design of the migration tube ensures that the experimenter can test it conveniently, quickly, accurately, clearly and intuitively. The standard resistance in parallel is convenient for the experimental data processing of the experimenter. The matching of the device connection diagram and the test method provides the students with the quality assurance of the experimental operation and the experimental results. The granting of the national patent right of the migration tube indicates that it is innovative, practical, novel and scientific.
The device has simple working principle, convenient operation and good safety. It is an environment-friendly instrument and can accurately measure the number of H+ ion migration. In the experimental teaching, the students are easy to understand and master, and the test speed is fast, the work efficiency is high, the experimental measurement error is small, and the relative error of the test result is less than 5%. The device is low in price and easy to promote and use, which is conducive to the understanding of the basic knowledge of students and the exercise of students' practical ability.
Completion unit: Shanghai University Chemical Experiment Center
Name of the work: Experimental method for measuring H+ ion migration number by interface method
The nervous system is a system in the body that plays a leading role in the regulation of physiological functions and activities. It is mainly composed of nervous tissues and divided into two major parts: the central nervous system and the peripheral nervous system.The central nervous system includes brain and spinal cord again, and the peripheral nervous system includes cranial and spinal nerves.
This model is suitable to medical institutions to explain human anatonv, such as thoracic surgery and internal medicine curriculum as visual aids, can be used for classroom health demonstrations and anatomy teaching aids and can also be used for children's educational toys.
Nerves Model,Nervous Tissue Model,Nervous System Model,Nervous System Project Model
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