双联压强计的设计及使用

用有机玻璃板和橡皮膜制成了双联压强计,不仅可以直观的演示液体中的内部压强,还可以演示浮力的有关实验.     

液体压强演示实验仪器的改进

图1所示是探究液体压强规律的演示器材,用于演示： （1）液体内部向各个方向都有压强; （2）同一深度液体向各个方向的压强相等; （3）液体压强随深度的增加而增大． 但在使用过程中,由于玻璃筒各端口都用橡皮膜封住,无法与外界大气压相通．当将实验器材置于水槽中时,玻璃筒内的密闭气体由于橡皮膜向内凹陷而被压缩,导致内部气体压强增大,影响橡皮膜向内凹陷的程度,从而影响了实验的直观效果．     

液体内部压强的演示实验

介绍了一个可以分别演示液体中不同方向、不同深度，不同密度的压强的实验装置。     

"恒质式"液体压强演示器

学生对液体静压强的大小，只与液体深度与密度有关，而与液体质量多少、不同形状无关，缺少必要的感性认识．加之，现行教科书中，液体压强公式是通过建立抽象的理想液柱模型后，理论推导得出，初中学生受知识储备和心理水平发展的限制，对这样呈现知识的方式不太适应，接受起来比较困难，从而成为教学上的一个难点，也是初中学生学习物理知识的分化点，因而倍受一线教师的关注，许多教师都体会和认识到增加这一演示实验是很有必要的，也为此做了很多的尝试，努力研制过一些实验装置．但这些装置虽各有千秋，却都存在一个严重的不足，     

对一个液体压强实验的分析与改进

通过观察饮料瓶侧壁小孔射出的水流,可以说明液体对侧面有压强;观察水流情况的不同,可以说明压强的大小.分析了液体压强实验原理,提出了该实验的注意事项,并给出了改进方案.     

“液体压强”实验的改进与创新

液体压强实验的创新在于充分利用生活中的物品完成教材实验,器材随处可见,体积轻小灵便,操作简单,现象明显,易于对比,激发学生学习物理的兴趣.并为学生树立废物回收的榜样,引导学生自主设计实验,提高动手和创新能力.     

用液体电池改进安培力实验

对安培力实验作了改进,对普通物理课演示实验改进是一次有益的尝试。     

说明液体流速与压强关系的有趣实验

中师物理课本第一册液体的流速与压强一节,在讲述了液体流速与压强的关系后,介绍了两个小实验:唇下放纸条,用力吹气时纸条飘起和朝下的漏斗里放乒乓球,用力吹气时球不掉下来。这里介绍一个学生容易做,且更为有趣的小实验,来帮助学生理解这一规律。     

浅析液体压强实验

前段时间笔者到成都一所重点中学参观并与学生一起做了探索液体压强的相关实验,归纳了此组实验常出现的几个问题及解决办法,供大家参考.     

对沸点与气压关系实验装置的改进

通过增加2个气球改进了沸点与气压关系演示实验装置．学生通过气球体积的变化可了解压强的变化．     

Variable volume piezometer for measurement of volumetric properties of materials under high pressure

A piezometer was designed to measure volume change of foods and other biomaterials as a function of pressure, and calibrated and tested up to 700 MPa at 25°C. The sensor was constructed from a polycarbonate tube, sealed with a plug on one end and a removable piston on the other. Samples were placed inside the tube. Upon pressurization, the piston displaced inside the tube, transmitting pressure to the sample; impedance in a magnet wire coil on the outside of the tube was measured to characterize volume change. Sensor calibration with water yielded a polynomial that characterized volume as a function of impedance. Sensor precision is 0.3% of measured volume; its resolution allows measurement of sub-microliter volume changes. Testing with ethanol and sucrose solutions yielded data within 1% of previously reported values. The sensor's applications include measurement of volumetric properties of liquid and solid biomaterials, and chemical reaction volumes.     

落球法测液体粘度实验的改进

采用光电计时装置,对落球法测定液体粘度实验作了改进,减少了由手控计时引起的误差,提高了实验的准确度,扩大了测量范围．     

液体折射率测量实验中提高半荫视场可见度的途径

分析了掠入射法测定液体折射率实验中棱镜角的选择范围,提出了增加半荫视场可见度的途径,讨论了光源位置和棱镜选取对半荫视场分界线可见度的影响,得出了实验室常用棱镜的选择方案.     

Improving the catalytic performance of nickel-iron oxide to oxygen evolution reaction by refining its particles with the assistance of ionic liquid

Ionics - In this work, an electrocatalyst (IL-NiO·Fe2O3) to oxygen reduction reaction (OER) was fabricated by hydrothermal method with the assistance of ionic liquid...     

Improving the CSIP performance

A novel highly sensitive detector for long wavelength infrared radiation, called charge sensitive infrared phototransistor (CSIP), is described, with a stress put on the report of recent improvements in the quantum efficiency. Metallic antenna structure placed on the surface to convert incident radiation has to be optimized. In case of the CSIP, where the absorbing quantum well is very close (～100 nm) to the antenna, near field effects have to be taken into consideration. We consider several patterns based either on a double capacitive (dot) or inductive (hole) grating. We present results of a study comparing four different geometries showing that cross shape hole arrays are most promising candidates reaching efficiencies of almost 8%. Further strategies to optimize essential parameters of antennas by using finite difference time domain (FDTD) simulations are considered.     

Improving the heavy-Higgs four-charged-lepton signature

Assuming the Higgs scalar boson H⁰ of the standard model has mass m_H>2M_Z, we show that the popular four-lepton decay signature H⁰→ZZ→ℓ₁⁺ℓ₁⁻ℓ₂⁺ℓ₂⁻ at the SSC can be significantly enhanced relative to the continuum ZZ background by requiring high transverse momentum for at least one Z. The calculated signal is sensitive to the top quark mass.     

双棱镜干涉测量的改进

多年来有关双棱镜干涉的工程测量和实验教学,必须在D〉4f条件下进行测量,文中经过理论论证和多次的实验研究,对原有的测量方法进行改进,在不降低测量精度的情况下使得测量的可靠操作性大大增强。     

Improving the electrong-2 measurement

The measurement and calculation of the anomalous magnetic moment of the electron currently provides the most stringent test of QED. In the past, one of the limitations in the experiment has been the small inhomogeneous component of the magnetic field which has been used to detect the magnet resonances of the trapped electron. We have developed a technique which allows us to reduce this inhomogeneous field by as much as two orders of magnitude and have demonstrated the technique with a factor of fifteen reduction, virtually eliminating the broadening of the magnetic lines in our geonium atom.