Showing papers by "Chinese Academy of Sciences published in 1979"
TL;DR: In this paper, the authors attempted to assess the ecosystem health of Korean pine and broad-leaved mixed forest under various human disturbances, and the results showed that the health degree was in the order of 20% intensity selective cutting stand (0.21) < 50% intensity selective cutting stand(0.44) < middle and mature Birch stand ( 0.67) < youth birch stand( 0.72) < Korean pine plantation (0.,74) < larch plantation(0.,77).
Abstract: On the bases of samples investment and related data collected by others, and with the method of health distance assessment and the ecosystem health index system of Korean pine and broad-leaved mixed forest established in prior paper, this paper attempted to assess the ecosystem health of Korean pine and broad-leaved mixed forest under various human disturbances. The results showed that the health degree was in the order of 20% intensity selective cutting stand (0.21) < 50% intensity selective cutting stand (0.44) < middle and mature birch stand (0.67) < youth birch stand (0.72) < Korean pine plantation (0.74) < larch plantation (0.77).
57 citations
TL;DR: In this paper, the CO2 concentration in broad-leaved Korean pine forest of Changbai Mountains was measured continuously with a CO2 infra-red analyzer in 2003.
Abstract: The CO2 concentration in broad-leaved Korean pine forest of Changbai Mountains was measured continuously with a CO2 infra-red analyzer in 2003. The results showed that the CO2 concentration in the forest had striking characteristics of temporal-spatial variations, which were mainly influenced by the physiological processes of plants, soil respiration, and intensity of turbulence exchange. In growing season, the daily maximum and minimum CO2 concentration appeared mostly on the surface floor at about 5:00 in the early morning and at canopy location at about 15:00 in the afternoon, respectively. There was an obviously process of forest CO2 emission when the inversion broke at dawn. The average CO2 concentration in forest was 377 micromol x mol(-1) in 2003, the maximum of monthly average appeared in January as 388 micromol x mol(-1), and the minimum of monthly average appeared in August as 352 micromol x mol(-1). The forest acted as CO2 source in night time and turned to sink in daytime, during growing season. In non-growing season, the forest acted as CO2 source in both daytime and night time, but still had a clear evidence of CO2 assimilation at noon, with canopy location during non-growing season.
39 citations
TL;DR: The results showed that the total evapotranspiration ranged from 581 mm to 695 mm during 1993 and 2002, averaged 634 mm, and supplemental irrigation was essential in this region for the uneven distribution of rainfall and time.
Abstract: The potential evapotranspiration (ET0) values from 1951 to 2002 for the lower reaches of Liaohe Plain, North China, were estimated by Penman-Monteith equation, and the annual change in ET0 was analyzed. By using non-weighting lysimeters at Shenyang Experimental Station of Ecology (CAS) in North China, the daily evapotranspiration of flooded rice (Oryza sativa L.) at the interval of 10-11 days was determined for eight seasons from 1993-2002 (except for 1997 and 1999). The results showed that the total evapotranspiration ranged from 581 mm to 695 mm during 1993 and 2002, averaged 634 mm. Both in dry and wet seasons, supplemental irrigation was essential in this region for the uneven distribution of rainfall and time. The average crop coefficient (Kc) for eight years from 1993 to 2002 during the whole growth period was 1.32, with a second-degree polynomial change for the values of Kc during different rice growth stages.
19 citations
TL;DR: In the SU (2) × U(1) × S3 model, this is the case and CP violations originate mainly from the Yukawa sector as mentioned in this paper, and the Kobayashi-Maskawa mechanism of CP violation may not work.
6 citations
TL;DR: A technique for adhesion of fine particles (ca. 5 μ) of the 405 white diatomaceous support on the inner wall of glass tube with organic glue [poly (diethylaminoethyl methacrylate) acetate] is described in this article.
Abstract: A technique for adhesion of fine particles (ca. 5 μ) of the 405 white diatomaceous support on the inner wall of glass tube with organic glue [poly (diethylaminoethyl methacrylate) acetate] is described. The coated tube was drawn to capillary column by using a machine designed according to Desty's. The capillary column was then coated with stationary phase (such as squaiane, QF-1, Dexsil 300, PEG 20 M, OV-1, SE 30 and etc.) by the conventional dynamic or static method. This preparation method has proved easy to duplicate and is simple. The coating efficiency (UTE %) is within 60–90. The theoretical plate number per meter of an SE 30 column is about 4000, and per meter of a PEG 20 M column is about 2500. The columns thus prepared have been successfully used to analyze petroleum hydrocarbons, essential oils, petrochemicals, pheromone, steroid metabolites and others.
3 citations
27 Jul 1979
TL;DR: In this paper, it was reported that the diameter of each lenslet has been reduced to 60/urnin U.S.R.U.S., and that the image size still slaaller and indeed the more efficient way is to use the tapered grin fibre, forming images of the secondary and tertiary order of increasingly smaller sizes.
Abstract: At present the taking rate of raster high-speed photography is limited mainly by two factors: (1) the grain size of the photo-sensi-tive emulsion; (2) the size of the image formed by individual raster element. To reduce the grain size of the film while maintaining its speed is the honorable duty of the photo-chemists. To reduce the image size the engineers have endevoured to machine the dies with which the lenslets forming the lenticular plate is pressed as fine as possible, and is reported that the diameter of each lenslet has been reduced to 60/urnin U.S.S.R.1)2) It seems dif-ficult to get further reduction. With the birth of grin fibre or sel-foc fibre a new way is opened to make the image size still slaaller and indeed the more efficient way is to use the tapered grin fibre, forming images of the secondary and tertiary order of increasingly smaller sizes.© (1979) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
3 citations
TL;DR: In this article, channeling was used to investigate pulsed, Q switched and thermally annealed Si single crystals implanted with 40-keV Bi ions to a dose of 1015 atoms/cm2.
Abstract: Channeling was used to investigate pulsed, Q switched ruby-laser annealed and thermally annealed Si single crystals implanted with 40-keV Bi ions to a dose of 1015 atoms/cm2. After thermal annealing, residual damage decreased with increasing annealing temperature to a minimum value of 30% at 900°C. The Bi atoms in substitutional sites reached a maximum value (50%) after annealing at 750°C but decreased with increasing annealing temperature. Out diffusion of Bi atoms occurred at temperatures higher than 625°C. For comparison, the residual damage disappeared almost completely after pulsed-laser annealing (30 ns pulse width, Energy, E = 3J/cm2). The concentration of Bi in Si exceeded its solid solubility by an order of magnitude; 95% of Bi atoms were annealed to substitutional sites. Laser pulses of different energies were used to investigate the efficiency of annealing.
1 citations