In the experimental process of measuring liquid surface tension coefficient by pull-off method，there are many factors that influence the experimental results． Four factors that have significant influence on the experiment are summarized and analyzed by theoretical analysis，namely，the error of surface tension coefficient caused by temperature measurement deviation; Incorrect k value caused by rust or wear of weight leads to error of surface tension coefficient; The surface tension coefficient error is caused by the change of △U caused by the water on the ring，and the surface tension coefficient error is caused by the measurement error of the inner and outer diameters of the ring．The analysis results show that the surface tension coefficient measured by the experiment will gradually decrease with the increase of temperature，and its measurement error will be

aggravated with the increase of the number of rusty weights，the mass of water droplets attached to the ring and

the measurement error of inner and outer diameters．The research results can play a guiding role in reducing the

measurement error of liquid surface tension coefficient by pull-off method in the experimental teaching process

of college physics teaching．

The experimental data of the pull-off method to measure the surface tension coefficient is calculated in detail，and the accuracy of the measurement results is better at room temperature．A single measurement was performed under variable temperature． Due to the low accuracy of the temperature control device of the instrument and the small change of the surface tension coefficient with temperature，the measured value of each temperature point has a certain deviation，but the change trend of the experimental results is basically the same．

With the rapid development of China's electric power industry ,the renewable energy ,e.g.,wind andsolar energy,has rapidly   developed.However,the uneven spatial distribution and the supply instability greatlrestrict the development of new energy technologies. Focused on the development of gravity energy storage( CES) technologies ,it introduces four kinds of new grid-level gravity energy storage technologies emerging inthe world in recent years,including Gravity Power CES in USA,Ares Mountain GES in USA, Energy VaultCES in Swiss ,and Gravitricity CES in UK.Compared to the traditional electrochemical energy storage methodsuck kinds of CES technologies has the advantages of safety , large storage capacity and small impact on theenvironment.Also,they significantly reduce the dependence on geographical conditions and water resources.which are beyond the application of the traditional pumped hydro storage CES method.Thus , these new CESmethods have broad application prospects. According to the available researches, it also points out thedevelopment obstacles and technical problems of the new gravity energy storage technology ,which can providespecific guidance on the domestic development of GES technologies in China.

When a certain wavelength of light passes through the liquid，some of the light intensity will be absorbed by the liquid，and the absorption ability of different concentrations of liquid to the light intensity will be different．The remaining light intensity after liquid absorption will still cause photocurrent to be generated in the phototube．Based on the experimental principle of photoelectric effect，the corresponding photocurrent of the same liquid at different concentrations was measured．The calibration curve of the two is drawn，and the linear equation of the two is fitted by computer．That is，the corresponding concentration of the liquid can be calculated only by measuring the photocurrent of the liquid after light blocking through the photoelectric effect tester．

A new observation method of rainbow and neon phenomenon is proposed． By refitting the spectrometer with the light source and taking the self-made “optical lens and adding device”as the core，the dynamic adjustment of the light intensity of the light source，the length and width of the rainbow，the refractive index and other parameters is realized，which can stably present the curved rainbow phenomenon with adjustable curvature，and solve the difficulty in adjusting the parameters of the traditional device Neon presents the problem of single effect．The device is small and easy to carry，which provides a new enlightenment idea for guiding users to comprehensively learn the principle of neon imaging in multiple dimensions．

Newton ring experiment is a classical experiment about equal thickness interference．The curvature

radius of a plate-convex lens can be measured using the Newton ring method．One important step in this method

is to transform the formula into a measurable form． It is commonly considered that the reason for this

transformation is that one cannot know the center“or”the order．We will show that both the center“and”the

order cannot be measured．Meanwhile，we also prove that the data can be processed with linear fitting method．

Taking the "electrostatic field" part of university physics and experimental courses as an example，the ideological and political teaching of exploratory courses is designed to study how to organically integrate ideological and political education in each teaching link，so as to cultivate students’scientific spirit of pursuing truth and climbing mountains，and stimulate the sense of responsibility and mission of loving the motherland

and serving the country scientifically．Through the questionnaire survey，it is found that students agree with the current ideological and political teaching mode，but there are still some areas to be improved．Through teaching discussion and teaching reflection，the improvement measures of subsequent ideological and political education are put forward．

Semiconductors play a important role in the contemporary age． In college physics experiment teaching，it is of great significance for students to deeply understand the band gap properties and measurement methods of semiconductors． The ultraviolet-visible diffuse reflectance spectroscopy method is an easy way to determine the band gap and energy band structure of semiconductors． It uses ultraviolet-visible diffuse reflectance spectroscopy and the Tauc Plot method to determine the band gap of the Ｒuddlesden-Popper semiconductor perovskite Srn+1TinO3n+1( n = 1，2，3，∞ ) ，and discusses the application of the Tauc Plot formula in transmission and reflection conditions．

In the steady-state method for measuring thermal conductivity coeficient of poor conductors , theinfluence of increasing the temperature of heating plate, decreasing the ambient temperature and closing thecooling fan on key experimental parameters , measurement error and experimental duration were studied.Theresults show that the experimental conditions had significant influence on the steady-state temperature of thecooling plate( T,) and the cooling rate of the cooling plate at 7,,and the systematic error of the experiment wasalso affected.Increasing the temperature of heating plate or decreasing the ambient temperature could effectivelyshorten the experiment duration with little influence on measurement error.Turning off the cooling fan couldreduce the experimental system error introduced by area correction, but the experimental duration wasprolonged.

For the experiment of measuring resistance with Wheatstone bridge, the virtual simulation jssuccessfully realized by using the LabVIEW2020 software.Based on the basic physical principles ,the programblock diagram of the bridge circuit is constructed and the intuitive panel of the experiment is designed ,to meetthe needs of users to complete the whole measurement process through the virtual simulation interface.In thesimulation experiment,the resistance R. shows a continuously adjustable and definite theoretical value in therange of l~1 000 2,the ratio arm R,/R, is continuously adjustable in the range of 0.001  1 000.and thecomparison arm R, is adjustable in the range of 0~9 999.99  through a six-digit decimal resistance box.Theresults of several simulation experiments show that the relative errors of the resistance R. are all below 1.0%showing a high accuracy.The simulation experiment can effectively measure the sensitivity of the bridge,andthe design method is very successful, which can be extended to virtual simulation applications of other electricalexperiments.