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| 1 | Effect of concentration of cadmium sulfate solution on structural,optical and electric properties of Cd_(1-x)Zn_(x)S thin films显示文摘Cd_(1-x)Zn_(x)S thin films were deposited by chemical bath deposition(CBD)on the glass substrate to study the influence of cadmium sulfate concentration on the structural characteristics of the thin film.The SEM results show that the thin film surfaces under the cadmium sulfate concentration of 0.005 M exhibit better compactness and uniformity.The distribution diagrams of thin film elements illustrate the film growth rate changes on the trend of the increase,decrease,and increase with the increase of cadmium sulfate concentration.XRD studies exhibit the crystal structure of the film is the hexagonal phase,and there are obvious diffraction peaks and better crystallinity when the concentration is 0.005 M.Spectrophotometer test results demonstrate that the relationship between zinc content x and optical band gap value E_(g) can be expressed by the equation E_(g)(x)=0.59x^(2)+0.69x+2.43.Increasing the zinc content can increase the optical band gap,and the absorbance of the thin film can be improved by decreasing the cadmium sulfate concentration,however,all of them have good transmittance.At a concentration of 0.005 M,the thin film has good absorbance in the 300-800 nm range,80%transmittance,and band gap value of 3.24 eV,which is suitable for use as a buffer layer for solar cells. | Yuming Xue Shipeng Zhang Dianyou Song Liming Zhang Xinyu Wang Lang Wang Hang Sun | 2021 | Journal of Semiconductors2021，42，11： | 3 |
| 2 | Differential Revolution、Differential Rotation and Global Changes显示文摘The Earth’s rhythm is controlled by the intermittent energy liberation in the Earth. In the Earth’s revolution and the Earth’s rotation system, the energy conversion among the potential energy, thermal energy and rotational energy is different from that in non revolution and non rotation system. In the Earth’s core, there exists not only huge thermal energy, but huge rotation energy and radioactive heat source. They are the internal causes of energy liberation. Astronomical factor makes the Earth’s inner core to vibrate periodically, makes the Earth’s orbit, the Earth’s volume, the Earth’s ellipticity, speed of the Earth’s revolution and speed of the Earth’s rotation to change periodically, it is the external cause of the intermittent energy liberation. As concerns the differential rotation of the Earth’s inner core, the fluctuations of gravitational constant G value makes the solar radiative quantity and the solar system’s volume to change and to effect the exchange of core mantle angular momentum and volume of crust mantle, and so leads to the formation and eruption of the superplumes, so it controls the energy exchange in CMB. It is the reason for the correspondence of the geological cycles one by one with the astronomical periods and is the basic cause of the Earth’s rhythm. According to the astronomical periods, it is probable that the geological changes may be predicted in the future. The conclusion deduced from the spherical presure formula is emphasized here, that the earth core is in a non insulated status. This can, in the one hand, theoretically explain the large scale periodic energy release from the earth core, and it is also an appreciable warning to the over exploitation of energy from the interior of the earth, the thermal energy there is limited, not limitless. The over exploitation of the geothermal energy will not only warm up the earth surface quickly, but also cool down the interior of the earth in the long run and close attention is called for world over. | Yang Xuexiang, Chen Dianyou and Song Xiuhuan (Changchun University of Science and Technology, Changchun 130026,China) | 1999 | Global Geology1999，4，1： | 0 |
| 3 | Wavelength injection locking actively Q-switched random fiber laser based on random phase-shifted fiber Bragg grating and electro-optic modulator显示文摘In this paper, an actively Q-switched wavelength injection locking random fiber laser(RFL) based on random phase-shifted fiber Bragg grating(RPS-FBG) is proposed, and the performance of the laser is verified by experiments. Within the reflection bandwidth range of RPS-FBG, spanning from 1 549.2 nm to 1 549.9 nm, different laser modes with stable central wavelength and peak power can be selectively chosen by varying the injected light wavelength. The power fluctuation within 1 h is less than 0.1 d Bm, and the central wavelength drift is less than 0.02 nm. When the pump power increases from 90 mW to 300 mW, the pulse width decreases from 3.2 μs to 1.5 μs, and the pulse repetition frequency is 20 kHz. The RFL can reach a stable locking state at the lowest pump power of 100 mW and the lowest injection power of 3 d Bm. When the wavelength is locked, the output pulse is a single pulse. On the contrary, the unlocked output pulse is multi-pulse. The laser has the characteristics of high wavelength tunability in the reflection range of RPS-FBG and it can be an ideal light source in the fields of laser imaging and pulse coding. | PAN Honggang ZHANG Bo SONG Dianyou CHEN Zhipan CHEN Chunqi LI Rupeng | 2024 | Optoelectronics Letters2024，20，3： | 0 |
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