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남미 국가와의 원자력협력 방향 - 합동조사단의 원자력현황 리포트

  • 이문기
    • Nuclear industry
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    • v.16 no.8 s.162
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    • pp.18-26
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    • 1996
  • 과학기술처는 금년 중 주요 업무 계획의 하나로, 원자력 협력 대상국을 다각화하고, 원자력 협력의 효율적$\cdot$체계적 추진과 원자력 기술의 교류 기반 강화 차원에서 유럽$\cdot$동구$\cdot$아시아$\cdot$북미$\cdot$남미 등 권역별로 원자력 국제 협력 추진을 계획, 기술 조사단의 파견을 추진하고 있다. 이 글은 지난 4월 26일부터 5월 6일까지 유관 부처 및 산업계가 공동 참여한 민관합동조사단이 아르헨티나$\cdot$브라질$\cdot$칠레 등 남미 3국의 정부$\cdot$연구소$\cdot$산업체 등을 방문하여 얻은 각국의 원자력 현황의 조사 결과로서, 향후 남미 국가와의 원자력 협력시 귀중한 자료로 활용될 수 있을 것이다.

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Vegetative Growth and Flowering of Salvia splendens 'Salsa' in Response to Night Interruption (야파 처리가 살비아 'Salsa'의 영양생장 및 개화에 미치는 영향)

  • Hong, Yoon Yeong;Park, Yu Jin;Kim, Yoon Jin;Kim, Ki Sun
    • Horticultural Science & Technology
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    • v.32 no.4
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    • pp.434-439
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    • 2014
  • This research was conducted to examine the effects of night interruption (NI) at different times on vegetative growth and flowering in Salvia splendens 'Salsa'. Plants were grown in a growth chamber under 9-h photoperiod (short-day, SD) or 9-h photoperiod plus NI with light intensity at $3-5{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ photosynthetic photon flux. The NI was applied at 18:00-22:00 HR (NI18), 22:00-02:00 HR (NI22), or 02:00-06:00 HR (NI02). The net photosynthetic rate under NI18, NI22, and NI02 increased by 0.33, 0.16, and $0.13{\mu}mol{\cdot}CO_2{\cdot}m^{-2}{\cdot}s^{-1}$, respectively, during the NI period. Dry weight, plant height, and the number of nodes under NI were not significantly different from those of the plants under SD. However, flowering was earlier by approximately 9.8 days, and the number of flowers increased to 138.7 in NI02 compared to 36.4 flowers under SD at 17 weeks after the treatment. Our results indicate that NI02 was the most effective treatment in promoting flowering. Although vegetative growth of salvia was not increased in response to the increased net photosynthesis, flowering was promoted. Under NI18, NI22, and NI02 treatments, 77.8, 88.9, and 100.0% of salvia plants flowered within 8 weeks, whereas 44.4% of the plants flowered within the same time under SD conditions.

The Effect of Nutrient Solution Concentration on Growth of Potato Plantlet in Microponic System (Microponic system에서 배양액의 농도변화가 감자 소식물체 생육에 미치는 영향)

  • Ko, Sun A;Choi, Ki Young;Lee, Yong-Beom
    • Journal of Bio-Environment Control
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    • v.23 no.2
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    • pp.144-147
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    • 2014
  • It was intended to closely examine an effect that a change in the concentration of culture medium had on the potato(Solanum tuberosum L.) plantlet growth in the microponic system so as to mass-produce the virus-free plant of new variety 'Saebong' for potato processing. The adjusted concentration of potato culture medium was 0.2, 0.6, 1.0, 1.4, 1.8, and $14.0dS{\cdot}m^{-1}$. And potato seedling was cut into pieces of 1.5 cm in length, which included 2 growth points and leaves. And each was explanted in glass vial of 50 mL. And experiments were carried out twice for 18 days or 21days. Culture medium of 2ml was put in the container respectively. And 1 mL was added after 10 days. And in terms of cultivation environment, the experiment was carried out at the day length of 16 hours at the temperature of $23{\pm}1^{\circ}C$ under the white LED light of $40{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. The concentration of culture medium in the experiment I was EC 0.2, 1.0, $14dS{\cdot}m^{-1}$ and was adjusted to 0.6, 1.0, 1.4, $1.8dS{\cdot}m^{-1}$ in the experiment II. The results showed that the survival rate of plantlet was 90% at $0.2dS^2m^{-1}$, 100% at $0.6dS^2m^{-1}$, 100% at $1.0dS^2m^{-1}$. 0% at $1.4dS{\cdot}m^{-1}$, 0% at $1.8dS{\cdot}m^{-1}$. and 0% at $14.0dS{\cdot}m^{-1}$ after 7 days. With regard to the explanted potato seedling, in case of the treatment where the electrical conductivity of culture medium was adjusted to $1.0dS{\cdot}m^{-1}$, root developed 2 days after transplantation. And the plantlet vigorously grew into strong plant that had 7 leaves, length of 5cm, and fresh weight of 0.5 g after 18 days. In case of the treatment where the concentration of culture medium was adjusted to $0.6dS{\cdot}m^{-1}$, the root plantlets developed 4 days after transplantation. And those grew into plant that had 7 leaves and fresh weight of 0.2 g after 21 days. Therefore, we found that it is effective to control potato culture medium by adjusting its electrical conductivity to $0.6{\sim}1.0dS{\cdot}m^{-1}$ for the mass production of virus-free potato seedling in the microponic system.

울진 원전 1$\cdot$2호기 - 원자력발전량 1천억kWh 달성

  • 한동운
    • Nuclear industry
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    • v.16 no.5 s.159
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    • pp.42-51
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    • 1996
  • 울진 원전 1$\cdot$2호기가 88년과 89년에 각각 상업 운전을 개시한 이래, 지난 3월 18일로 총 1천억kWh의 발전량을 달성했다. 울진 1$\cdot$2호기는 이 기간 동안 최장 382일을 포함해 네 차례의 OCTF를 달성하는 등 설비 운영과 관리에서 탁월한 실적을 나타냈다. 원자력발전량 1천억kWh 달성의 경과와 의의를 들어본다.

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Genetic Model of Mineral Exploration for the Korean Au-Ag Deposits; Mugeug Mineralized Area (한국 금-은 광상의 효율적 탐사를 위한 성인모델;무극 광화대를 중심으로)

  • 최선규;이동은;박상준;최상훈;강흥석
    • Economic and Environmental Geology
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    • v.34 no.5
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    • pp.423-435
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    • 2001
  • The gold-silver vein deposits in the Mugeug mineralized area are emplaced in late Cretaceous biotite granite associated with the pull-apart type Cretaceous Eumseong basin. Mugeug mine in northern part is composed of multiple veins showing relatively high gold fineness and is characterized by sericitization, chloritization and epidotization. The ore-forming fluids were evolved by dilution and cooling mechanisms at relatively high temperature and salinity (=30$0^{\circ}C$,1~9 equiv. wt. % NaCl) and highly-evolved meteoric water ($\delta$$^{18}$ O;-1.2~3.7$\textperthousand$) and gold mineralization associated with sulfides tormed at temperatures between 260 and 22$0^{\circ}C$ and within sulfur fugacity range of 10$^{-11.5}$ ~ 10$^{-13.5}$ atm. In contrast, Geumwang, Geumbong and Taegueg mines show the low fineness values, in southern part are characterized by increasing tendency of simple and/or stockwork veins and by kaolinitization, silicificatitan, carbonatization and smectitization. These droposits formed at relatively low temperature and salinity (<23$0^{\circ}C$, <3 equiv. wt. % NaCl) from ore-forming fluids containing greater amounts of less-evolved meteoric waters ($\delta$$^{18}$ O;-5.5~4.0$\textperthousand$), and silver mineralization representing various gold-and/or silver-bearing minerals formed at temperatures between 200 and 15$0^{\circ}C$ and from sulfur fugacity range of 10$^{-15}$ ~10$^{-18}$ atm These results imply that mineralization in the Mugueg area formed at shallow-crustal level and categorize these deposits as low-sulfidation epithermal type. The genetic differences between the northern and southern parts reflect the evolution of the hydrothermal system due to a different physicochemical environment from heat source area (Mugeug mine) to marginal area (Taegeum mine) in a geothermal field.

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Plant Growth Retardants Can Inhibit Stem Elongation and Improve Flowering Rate in Lilium concolor var. parthneion and L. dauricum (하늘나리와 날개하늘나리의 줄기 신장 억제와 개화율 향상을 위한 생장억제제의 이용)

  • Eum, Sun Jung;Park, Kyeung Il;Oh, Wook;Kim, Kiu Weon
    • FLOWER RESEARCH JOURNAL
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    • v.18 no.1
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    • pp.38-43
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    • 2010
  • To develop Korean native lilies as mini-potted plants, the effects of plant growth retardants on inhibiting stem elongation and improving flowering rate were evaluated. Bulblets of Lilium concolor var. parthneion (5-7 g) and L. dauricum (3-4 g fresh wt) derived from in vitro culture and then enlarged by field culture were applied with 0, 25, 50, or $100mg{\cdot}L^{-1}$ ancymidol, diniconazole, and uniconazole through bulb dipping, foliar spray, and drench. In L. concolor var. parthneion, uniconazole dipping most effectively reduced plant height by 60.7-78.3% depending on concentration compared with control without decreasing flowering percentage. In L. dauricum, dipping into diniconazole solution significantly retarded the plant height by 70.0-86.3% and improved flowering percentage by 8.3-18.2% compared to control of 0%. Drench of $25-50mg{\cdot}L^{-1}$ ancymidol was also effective on inhibition of stem elongation and improvement of flowering rate. Therefore, dipping into $50-100mg{\cdot}L^{-1}$ uniconazole solution in L. concolor var. parthneion and dipping into $25mg{\cdot}L^{-1}$ diniconazole solutions or drench of $25mg{\cdot}L^{-1}$ ancymidol in L. dauricum can be useful to produce the mini-potted plants.

Growth and Maturation of a Green Alga, Caulerpa okamurae Weber van Bosse (옥덩굴(CAULERPA OKAMURAE WEBER VAN BOSSE)의 생장과 성숙)

  • Hwang, Eun-Gyeong;Park, Chan-Seon;Han, Jeong-U;Sin, Won-Jun;Choe, Chang-Geun;Son, Cheol-Hyeon
    • ALGAE
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    • v.18 no.3
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    • pp.217-223
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    • 2003
  • Seasonal growth and maturation process of Caulerpa okamurae were investigated in natural populations and in culture. Monthly sampling was carried out by SCUBA diving at Baekunpo, Busan, southeastern coast of Korea from November 1999 to October 2001. Growth of erect branches depended mainly on the water temperature in the natural habitat. Maximum length of erect branches was 14.0 $\pm$ 1.4 cm in June 2001 when the water temperature was 19.7$^{\circ}C$ and minimum was 2.8$\pm$0.2 cm in April when the water temperature was 14.7$^{\circ}C$. Fresh weight of erect branches was 3.9 $\pm$ 0.5 g in June 2001 and 0.2 $\pm$ 0.04 g in September 2000. Biomass of the population was maximum of 922.5 g dw${\cdot}m^{-2}$ in July and minimum of 125.6 g dw${\cdot}m^{-2}$ in April. Gametangial network was observed on the ramuli when the water temperature was over 19$^{\circ}C$ in August 2000 and June 2001. In the culture regime of 4 temperatures (15, 20, 25 and 30$^{\circ}C$) and 3 irradiances (20, 50 and 80 $\mu$mol${\cdot}m^{-2}{\cdot}s^{-1}$) combination, the maturation of excised erect branches was mainly affected by temperature. Maturation was induced under all irradiance conditions at 20 and 25$^{\circ}C$; under 80 $\mu$mol${\cdot}m^{-2}{\cdot}s^{-1}$ at 15$^{\circ}C$; and under 20 $\mu$mol${\cdot}m^{-2}{\cdot}s^{-1}$ at 30$^{\circ}C$. The highest rate of maturation was 64% under 20 $\mu$mol${\cdot}m^{-2}{\cdot}s^{-1}$ at 25$^{\circ}C$. These results suggested that developmental initiations of C. okamurae occurred at higher than 13$^{\circ}C$ and maturation took about 270 degree-days.