scholarly journals The Fine Mechanics of Haematopoiesis

2020 ◽  
Author(s):  
Chen Zhao ◽  
Qianze Dong
Keyword(s):  
Fine Mechanics

scholarly journals Research and development of new neodymium laser glasses

2017 ◽  
Vol 5 ◽  
Author(s):  
Dongbing He ◽  
Shuai Kang ◽  
Liyan Zhang ◽  
Lin Chen ◽  
Yajun Ding ◽  
...  
Keyword(s):  
Laser System ◽  
Phosphate Glasses ◽  
Neodymium Laser ◽  
Power Laser ◽  
Peak Emission Wavelength ◽  
High Power Laser System ◽  
Lower Thermal Expansion ◽  
Shock Resistance ◽  
Fine Mechanics ◽  
Peak Emission

This work presents a brief introduction on three kinds of newly developed $\text{Nd}^{3+}$ -doped laser glasses in Shanghai Institute of Optics and Fine Mechanics (SIOM), China. Two $\text{Nd}^{3+}$ -doped phosphate glasses with lower thermal expansion coefficient and thermal shock resistance 4 times higher than that of N31 glass are developed for laser processing. Nd:Silicate and Nd:Aluminate glasses with peak emission wavelength at 1061 and 1065 nm, effective emission bandwidth of 34 and 50 nm, respectively, are developed for Exawatt-class laser system application. Fluorophosphate glasses with low nonlinear refractive index ( $n_{2}=0.6{-}0.86$ ) and long fluorescence lifetime ( $430{-}510~\unicode[STIX]{x03BC}\text{s}$ ) are investigated for the purpose of decreasing B integral in high-power laser system. The properties of all these glasses are presented and compared with those of commercial neodymium laser glasses.

Comparisons of Tunnel Greenhouse for the Carrying Snow Loading Capacity

2012 ◽  
Vol 170-173 ◽  
pp. 1731-1734
Author(s):  
De Fa Sun
Keyword(s):  
Carrying Capacity ◽  
Structure Design ◽  
East China ◽  
Loading Capacity ◽  
Equal Strength ◽  
Structure Scheme ◽  
Snow Loading ◽  
Fine Mechanics

Through the Comparisons of tunnel greenhouse for the carrying snow loading capacity under the different mode of transfer force, some conclusions are summed up: different mode of transfer force has much influence upon the carrying capacity under the same snow loading. The unite of structure scheme to whole-part should be thought much in the structure design for greenhouse according to the principle of equal strength. The results indicate that the structure of east-china type multi-span tunnel plastic greenhouse is rational, and has fine mechanics properties.

scholarly journals Absolute study of spectra from laser-produced plasmas

1991 ◽  
Vol 9 (4) ◽  
pp. 787-793 ◽  
Author(s):  
Yao-Lin Li ◽  
Xiao-Fang Wang ◽  
Zhi-Zhan Xu ◽  
Shi-Sheng Chen ◽  
Ai-Di Qian
Keyword(s):  
Source Size ◽  
Atomic Spectrum ◽  
X Ray ◽  
Dispersive Order ◽  
Transmission Grating ◽  
Grating Spectrometer ◽  
Beam Laser ◽  
Laser Facility ◽  
Numerical Process ◽  
Fine Mechanics

A method of absolutely unfolding the atomic spectrum by a pinhole transmission grating spectrometer (TGS) is discussed in detail. The numerical process considers both the factors of higher-dispersive-order overlapping of TGS and source-size widening effects. Real soft-X-ray spectra of aluminum, copper, and gold plasmas are presented of experiments performed on the Six-Beam Laser Facility at the Shanghai Institute of Optics and Fine Mechanics.

scholarly journals Tradition of geodetic instruments production in the Czech Republic

2021 ◽  
Vol 12 (2) ◽  
pp. 171-178
Author(s):  
Pavel Hánek ◽  
Pavel Hánek Sr.
Keyword(s):  
Czech Republic ◽  
19Th Century ◽  
Roman Emperor ◽  
The Czech Republic ◽  
Significant Development ◽  
State Administration ◽  
The 1960S ◽  
The 19Th Century ◽  
Fine Mechanics ◽  
Geodetic Surveying

Abstract. The article describes the development of geodetic surveying and production of geodetic instruments in what is now Czech Republic. The beginnings of development can be found in the 12th–13th centuries during the colonization of the territory and the consolidation of state administration. Significant development peaks occurred in the 14th century during the reign of the Holy Roman Emperor and King of Bohemia Charles IV and then at the turn of the 16th and 17th centuries during the reign of the Holy Roman Emperor Rudolf II. The new direction is related to the development of industry at the end of the 19th century. At that time, several dozen companies in fine mechanics and optics were operating in Prague. The company J. & J. Frič was a world leader in the use of a glass divided circle in 1864. The production of astronomical and geodetic instruments in Czechoslovakia was successful until the end of the 1960s.

Sign in / Sign up

Export Citation Format

Share Document