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水稻의 播種密度와 育苗日數가 機械移秧用 箱子苗의 生長과 素質에 미치는 影響
安壽奉,金聲來,朴昌用 충남대학교 농업과학연구소 1981 農業技術硏究報告 Vol.8 No.2
Effect of the seeding rate and nursery period on the growth and characteristics of seedling suitable or rice transplanter was analyzed and the following results were obtained. The optimum seeding rate were about 100 to 150g in the 30 day old seedling, and 150g per nursery box in the 25day old seedling, respectively, as having adequate leaf number, plant height, dry weight, hardiness and crop growth rate for transplanting. Excessively low and high seeding rate resulted in excessive aging and weakness of the seedling at the later growth stages.
Ca와 Zr을 소량 첨가한 나노결정 Fe-Si-B-Cu계 합금의 미세조직변화와 자기적특성
안수봉,장수환,박원욱,손근용 대한금속·재료학회 2021 대한금속·재료학회지 Vol.59 No.3
Nanocrystalline Fe-Si-B-Nb-Cu Finemet alloys show low saturation magnetic flux density compared to amorphous Fe-Si-B alloys. In the Fe-Si-B-Cu base amorphous alloys, Cu atoms form clusters which act as heterogeneous nucleation sites for α-Fe crystals. The addition of Ca element atoms, distributed along grain boundaries, helps inhibit grain growth and increase resistivity. These alloys can be crystallized into fine nanograins through proper heat treatment, with increased saturated flux density and decreased core loss. According to previous studies, the addition of Zr element can also reduce nanograin size and suppress grain growth by its distribution mainly along the grain boundaries. In this experiment, the effects of added Ca and Zr on the microstructural changes and magnetic properties of Fe-Si-B-Cu were evaluated in detail. Fe-Si-B-Cu alloys containing Ca, and Zr elements were melt-spun to make rapidly solidified ribbons ~20 μm in thickness. The ribbons were then wound into toroidal shaped ribbon cores and heat treated to obtain the nanocrystalline soft magnetic ribbon cores. The microstructure was observed using TEM, and the magnetic characteristics were evaluated using an B-H meter and impedance analyzer. Based on the results, the Fe- Si-B-Cu ribbon core containing 0.037 wt.% Ca and 1.68 wt.% Zr was determined to have the lowest core loss among the alloys, when annealed at 440 oC for 30 min. It was also confirmed that the added Ca and Zr elements were distributed along the grain boundary, and suppress the growth of crystals. In conclusion, the addition of minor elements Ca and Zr to the nanocrystalline ribbon core was very effective at reducing core loss, and the saturated flux density of the core also increased pronouncedly compared to the Fe-Si-B-Nb-Cu Finemet alloys.
窒素施用量 및 登熟期 切葉處理가 水稻收量構成要素에 미치는 影響
安壽奉,李鍾喆 충남대학교 농업과학연구소 1977 農業技術硏究報告 Vol.4 No.1
We have studied the responce of nitrogen on the newly bred varieties, Yusin and Milyang #23, and the effects of defoliation at maturing stage on the rate of ripened grains under different nitrogen levels. The results obtained are summarized as follows : 1. Milyang #23 as well as Tongil was found to be highly nitrogen responsive variety and showed good grain maturing percentage. The number of grain per unit area affected the total yield under the high levels of nitrogen application. The variety, Yusin, was less responsive to nitrogen and had also less leaf area than other varieties under the high level of nitrogen application. Yusin also seemed to have low maturing percentage due to unbalanced ratio between photosynthetic area and size of storage. 2. The low internodes and leaf blade of Yusin and Milyang #15 were grown too much under high levels of nitrogen and these caused more lodging and less light penetration in pant canopy. 3. The effects of defoliation at maturing stage on yield was high under the high levels of nitrogen application, especially when defoliation was done early stage of maturing. The effects of defoliation appeared to be greates in Tongil than in Milyang #15.
冷水灌漑 및 晩植時의 水稻登熟에 미치는 燐酸과 窒素의 相互作用
安壽奉 충남대학교 농업과학연구소 1980 農業技術硏究報告 Vol.7 No.1
In order to find the interaction between phosphorus and nitrogen effects during low temperature treatment, experiments of rice planted late at low water temperature were conducted and the following results were obtained. As the application of phosphorus increased, the soluble nitrogen content in the rice plants was decreased, while the degree of ripening was improved, especially when the application of nitrogen increased. When the heading was promoted due to high temperature, degree of ripening was improved. The number of spikelets increased due to the increased application of nitrogen fertilizers, and then The effects of phosphorus application on the improvement of ripening was less apparent.