To derive coronal temperature, electron density and nonthermal velocity, we have analyzed high resolution spectra (e.g., Fe XII 338.3, Fe XII 352.1, Fe XIV 334.2, Fe XIV 353.8, Fe XV 284.2, Fe XV 321.8, Fe XV 327.0, Fe XVI 335.4, and Fe XVI 360.8) taken from AR 6615 by SERTS (Solar Extreme Ultraviolet Rocket Telescope and Spectrograph). Important findings emerging from the present study are as follows: (1) Temperature estimated from Fe XVI 335.4 and Fe XIV, 334.2 is ~2.4 × 106 K and no systematic difference in temperature is found between the active region and its adjacent quiet region; (2) Mean electron density estimated from Fe XV is ~3 × 109 cm -3 and ~10 10 cm-3 from Fe XII and Fe XIV; (3) Mean density of the active region is found to be higher than that of the quiet region by a factor of 2; (4) Nonthermal velocity estimated from Fe XV and Fe XVI is 20 ~ 25 km s-l which decreases with increasing ionization temperatures. This supports the notion that the nonthermal velocity declines outwards above the transition region.

Membrane-based gas separation systems are now widely accepted and employed as unit operation in industrial gas, chemical, and allied industries. Following their successful commercialization in the late seventies to recover hydrogen from ammonia purge gas streams, membrane-based systems have gained acceptance in a wide variety of applications. Numerous systems are in operation today to: recover hydrogen from other purge gas and hydrocarbon streams; adjust the H2/CO ratio in syngas; remove CO2 from natural gas; recover helium; dry gas streams; and separate air. Lower cost, ease of operation, operational flexibility and portability are a few of the reasons membrane-based systems are chosen over absorption and cryogenic-based separations in certain applications.

This empirical exploratory study is part of a larger comprehensive study of countertrade in the Asia-Pacific region. A structured interview of 60 South Korean international trading firms during the latter half of 1990 reveals that a positive attitude toward countertrade exists among both countertraders and non-countertraders in South Korea. Further, except for a few statistically significant differences, there is general agreement among both countertraders and non-countertraders as to the differences faced, reasons for not countertrading, and benefits derived from countertrade.

Orchardgrass(Dactylis glomerata L.) hays, which had been harvested in different seasons and grown with different levels of potassium (K)fertilizer, were fed to foats in metabolic cages in order to know the effect forage mineral content on mineral balance

유리전이온도가 95℃인 폴리스티렌 균질막에서 CO2의 수착과 투과실험을 온도는 60℃, 수착실험은 1.6 MPa 범위, 투과실험은 2.5 MPa 범위 내에서 각각 행하였다. 낮은 기체압력하에서는 수착등온선이 dual-mode sorption model에 일치하였으나 1.3 MPa 이상에서는 직선이었고, 직선부분은 원점까지 외삽되었다. 평균투과계수의 압력의존성은 dual-mode mobility model로부터 위로 편기되었다. 수착등온선으로부터 폴리스티렌 막은 1.3 MPa의 기체압력에서 수착된 CO2의 가소화거동에 의해서 유리전이가 일어난다는 것을 알았고, 이는 평균투과계수의 증가와 일치하였다.

봄철에 자라는 목초를 다른 계절의 목초와 비교하면 어떤 특성이 있는지, 또 그 시기의 칼룸질 비료의 시용이 목초의 수분 또는 마그네슘 함량에 어떤 영향이 있는가를 알아보고자 오차드그라스 (Dacctylis glomerala L.) 채초지에서 시험했는데, 그 결과는 칼륨 시용에 따른 무기질과 수분함량에 계절차이가 뚜렷하다는 것이었다 본 시험에서 봄철 (4월)에 생육하는 목초의 무기질함량은 다른 계절보다 큰 변화를 나타냈으며, 칼륨함량은 높고 마그네슘함량은

A laboratory bioassay that incorporates Bacillus thuringiensis (Bt) purified crystal protein toxins into an artificial diet has identified three toxins, CryIA(b), CryIA(c), and CryIIA, to by effective against the yellow stemborer, Scirpophaga incertulas(Walker). Research is aimed at engineering rice that incorporates genes of one of or more of these toxins so as to mimic the insecticidal action of the insect to Bt. The paper discusses potential strategies for slowing the rate of adaptation that include the use of multiple Bt toxins, promoters that express the toxins only in specific plant tissues at specific times, and mixing transgenic and non-transgenic plants.

캐나다에서 화본과와 두과목초 및 사료작물은 가축사양에 있어서 주된 에너지 공급원이다 캐나다에 는 약 1,100만 ha의 개량초지와 조사료 생산은 가능하지만 환경조건이 다소 불량한 방대한 면적의 아직 개발되지 않은 3,000만 ha가 넘는 일반초지가 있다. 캐나다는 약 1,240만우의 육우와 약 150만두 의 젖소를 가지고 있다.캐나다 남부지역에서는 짧은 생육기간이 초지농업을 제한한다. 겨울은 길며, 대부분 지역은 저온, 결벙, 해벙 및 질병 등으로 사초

Classical membrane processes like microfiltration (MF), ultrafiltration (UF) and reverse osmosis (RO) are being applied in the last years more frequently in environmental and effluent process problems. Newer technologies and developments like pervaporation (PV) and gas sepaxation (GS) recently found commercial applications in the treatment of waste waters and gas streams. The incentive here is either the clean-up from organic components to comply with federal emission regulations or the recovery of the organics for economical reasons. Processes still in their development stage are combinations of chemical reactions with membrane processes to separate and treat SOx and NOx laden waste gas streams in the clean-up of stack-gases. In this paper we will first give a short overview of the more recent developments in MF, UF and RO. This is followed by a closer look on newer technologies applied in environmental problems. The applications looked at are the recovery of organic components from solvent laden gas streams and the separation of organic volatiles from aqueous waste waters via pervaporation. Technical solutions, the advantages and disadvantages of the processes and. where possible, cost estimations will be presented.

목초의 재생에 따른 칼륨(K)및 마그네슘(Mg)함량의 변화를 알아보기 위해 6가지 목초에 대해 수정액중의 K2O농도를 10 ppm및 300ppm으로 하여 수경재배실험을 수행했다. 약간의 예외가 있었으나 2처리구 모두 예취회수가 늘어갈수록 목초중 칼륨함량이 낮아졌으며, 이러한 경향은 콩과보다 화본과목초에서 두드러졌다.한편 목초중 마그네슘 량은 예취회수가 많아질수록 증가했다. 제 1차 예취때 높은 칼륨함량과 낮은 마그네슘함량으로 인해 K/Mg 함량비가