We analyzed the growth characteristics of naturally regenerated seedings of Larix kaempferi in order to propose a field-applicable regeneration method. Experimental sites were established at Gapyeong in Gyeonggi-do and at Bonghwa in Gyeongsangbuk-do. We analyzed seed inflow features, occurrence, and growth characteristics of natural seedlings for three years. The reserved seed-tree site producedthe greatest number of inflow seeds and followed by seed-tree site and clear-cut site. In addition, the reserved seed-tree method was found to be more efficient than other methods in evenly scattering seeds. The rate of seedling occurrence at treatment sites (e.g., harvesting and scratching) was 2.4%, which is 8.0 times higher than the seedling occurrence (0.3%) at the non-treatment sites. There were approximately 470,000 seedlings per hectare at the treatment sites in June of the first year after regeneration and approximately 78,000 seedlings per hectare in October of the third year. The average diameter of the root collar of the seedlings in the third year was 6.5 mm, and the average height of the seedlings was 50.4 cm. These results indicate that it is possible to create a secondary forest of L. kaempferi by natural regeneration if harvesting and scraping are implemented during seed fructification. Considering the rapid growth of L. kaempferi shown in this study, the proposed method would be an efficient reforestation technique.
MMBR system has been suggested as a promising system to resolve harvesting problems induced from low settling efficiency of microalgae. And recently, a lot of research on reducing fouling at the MMBR system has investigated focused on EPS in many cases. EPS of microalgae mainly consists of polysaccharides and protein components, and is produced through photosynthesis and nitrogen-carbon metabolic pathways. Especially, P-EPS is one of major compounds which occur membrane fouling phenomenon, as its hydrophobic protein components cause floc formation and cake layer accumulation. And it is already known that almost every microalgae can metabolize P-EPS or Chl-a when nitrogen sources as a substrate is insufficient or exhausted situation. With the above backgrounds, uptake rates of P-EPS or Chl-a by Scenedesmus quadricauda according to the type of carbon source and nitrogen concentration were evaluated in order to verify correlation between carbon source vs P-EPS production, and indeed Scenedesmus quadricauda uses P-EPS or Chl-a when the amounts of nitrogen sourc es in the feed is not satisfied. As a result, it was shown that P-EPS and Chl-a production were increased proportional to nitrogen concentration under organic carbon condition. And especially, the amo unts of P-EPS and Chl-a in the cell were diminished with the nitrogen source becomes insufficient or exhausted. Because P-EPS accelerates fouling at the MMBR system, P-EPS degradation by Scenedesmus quadricauda in order to get nitrogen source may contribute to reducing fouling. About a affects of N-consumed Chl-a to the MMBR fouling, more survey is needed. On the contrary, considering the purpose of MMBR system of this study, i.e. harvesting useful high value microalgae efficiently feeding adequate industrial process wastewater, it seems like difficult to maintain satisfied metabolic activity and to harvest with high yield rate using nitrogen-poor MMBR feed.
HakSu Jang;Hyeon Jun Park;Gwang Hyeon Kim;Gyoung-Ja Lee;Jae-Hoon Ji;Donghun Lee;Young Hwa Jung;Min-Ku Lee;Changyeon Baek;Kwi-Il Park
Journal of Sensor Science and Technology
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v.33
no.1
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pp.34-39
/
2024
Energy harvesting technology that converts the wasted energy resources into electrical energy is emerging as a semipermanent power source for self-powered electronics and wireless low-power sensor systems. Among the various energy conversion techniques, flexible piezoelectric energy harvesters (f-PEHs), using materials with piezoelectric effects, have attracted significant interest because they can harvest a small mechanical energy into electrical signals without constraints of time and space in various environments. In this study, we used a flexible piezoelectric composite film fabricated by dispersing BaHfxTi(1-x)O3 (x = 0, 0.01, 0.05, 0.1) piezoelectric powders inside a polymeric matrix to facilitate f-PEHs. The fabricated f-PEH with optimal Hf contents (x = 0.05) generated a maximum output voltage of 0.95 V and current signal of 130 nA with stable electrical/mechanical disabilities under periodically bending deformations. In addition, we demonstrated a cantilever-type f-PEH and investigated its potential as a sensor by characterizing the output performance under mechanical vibrations at various frequencies. This study provides the breakthrough for realizing self-powered energy harvesting and sensing systems by adopting the lead-free piezoelectric composites under vibrational environments.
This study was conducted to develope the new solid separating system which can be efficiently and economically removed the solid parts in high pollutants concentration of pig slurry. The pollutants concentration, BOD$_{5}$ , COD and SS of the slurry used in this study was 15,990($\pm$2,389)mg/l, 20,004($\pm$5,512)mg/l and 26,486($\pm$5,935)mg/l, respectively. After removal of solid part in slurry, the pollutants concentration, BOD$_{5}$, COD and SS was change into 5,617($\pm$690)mg/l, 5,553($\pm$633)mg/land 1,456($\pm$341)mg/l, respectively in the Fixed biological membrane tank. The reduction of the pollutants concentration of suspend liquid through membrane will be allowed to greatly improve the water purification by an Activated sludge method. This separating system consisted of a temporary storage, a circulating tank and a Fixed Biological membrane tank. A temporary storage which has a draining system of screw type and an aeration device played a tremendous role in draining the solid by filled an aeration of 0.3 l/min. A Fixed Biological membrane tank of which a styrofoam filled in a 2/3 volume as a Biological media was fixed by a stainless steel net (pore size : 0.5mm) to separate the liquid layer of influx in them. The separating system efficiency factors were the speed of screw motor, cycle number of slurries in a circulating tank and moisture contents of solid effluent through the screw path. Although the pollutants concentration was very variable in temporary storage, the final concentration of $BOD_5$ and SS, except COD of the suspended liquid in a Fixed biological membrane were not different regardless of cycle number of a circulating tank. Moisture contents of effluent from temporary storage was 73% under the speed 1 ppm of screw motor and 62% under the 1/4rpm of it.
Park, Kyung-Seok;Lee, Seong-Youn;Choi, In-Hwa;Kim, Hyun-Sig;Ahn, Young-Sang;An, Ki-Wan
Journal of Korean Society of Forest Science
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v.101
no.4
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pp.710-721
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2012
This study is to find out the search of the desirable tree cutting permit system by investigating and analyzing timber logger's consciousness in Korea. A sample group, including 64 officers in 5 Regional Forest Services and 27 National Forest Stations, 161 local government of 322 officers and team leaders with cutting permits, and 308 tree loggers was surveyed. The survey results showed that the ongoing harvest year plan for national, public and private-type forests, which was applied differently, could be integrated as 3.73 points, which was not significant among the groups. A total of 95.1% of the national forest officers stated that the environmentally friendly harvesting system could be improved and that it is exempted from bad broadleaf trees and renewal of forest type (4.14 points). An environmentally friendly harvesting system including the type of forest and location status (slide, soil, etc) is needed (3.87 points). Additionally, the round timber purchased from tree loggers managed in 2009 was about 10.6% of the domestic timber supply ($3,176,000m^3$) and round timber sales were about 50.1%. A total of 72% of the loggers suggested that a environmentally friendly harvesting system is needed (4.11 points). These results show that a new system for harvesting timber is needed to replace the current environmentally unfriendly harvesting system, and that tree loggers should be registered for management.
Yu, Gyeong-Dan;Na, Han Beur;An, Gi Hong;Koo, Bon-Cheol;Ahn, Jong Woong;Moon, Youn-Ho;Cha, Young-Lok;Yoon, Young Mi;Yang, Jungwoo;Choi, In-Hu
KOREAN JOURNAL OF CROP SCIENCE
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v.58
no.3
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pp.324-330
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2013
One of the abundant biomass for bioenergy production is thought to be agricultural by-products produced annually. The purpose of this study were to provide basic information about the changes of the moisture contents and chemical compositions for storage periods and bale types of rice straw, and it was attempted for the first time. The bale types of rice straw which were harvest in October 2011, were the square bale, the round bale, and the wrapped round bale type with plastic, respectively. Each of bale were stored in house, outdoor, and rain sheltering facilities condition for 1 year. The moisture contents and chemical compositions for each bale type are investigated for the 3-storage stages (0, 6, 12 month). While the moisture contents of the square and round bales stored in house condition were ranged from 20~25%, the square bale stored under the rain shelter facilities was showed the lowest moisture content less than 20% during the storage periods. For the chemical compositions, the cellulose and hemicellulose contents of rice straw bale stored in outdoor condition were decreased with the storage periods. However, in house condition, the chemical compositions of the square and round bales were slightly increased at the middle and the end of storage stages (6 and 12 months) compared with the initial storage stage (0 month). In conclusion, while optimum and favorable storage conditions of agricultural by-products is a house storage of the bale with plastic, if the bale can stored at outdoor, water penetration prevention such as the rain shelter facilities is required.
Temporary control schedules were tested at sweet persimmon orchards to development new control programs to meet the quarantine repuirements of America in 2001 and 2002. The 'MRL-type control orchards' were sprayed with chemicals which were possibly adaptable to the pome trees in America. A control schedule consisted of those chemicals registered for persimmon in Korea was incorporated in the 'domestic-type control orchards'. The efficacy of these two control type against insect pests was compared with that of a conventional control schedule. In 2001, MRL orchard and domestic orchard were sprayed 7 and 6 times, and two conventional orchards were 6 and 9 times, respectively. In 2002, acaricide was added once to the MRL orchards at late September to reduce the density of mites on harvested fruits. However no insecticide to plant bug control could be applied to the MRL orchards, because no insecticide against bugs was registered for pome trees in America. This resulted in 7 times of applications in MRL and domestic orchards. The conventional orchard was sprayed 9 times. Only the occurrence of the peach pyralid moth, Dichocrocis puntiferalis (PPM) out of 4 quarantine inset species was observed. The PPM was observed during growing season in MRL, domestic, and conventional orchards. However no fruits damaged by PPM larvae were observed after mid October and after harvest. In 2002 only 1 fruit out of 1,350 fruits inspected in June was damaged by the larvae of PPM at MRL orchards. A fungus-feeding mites and collembolan were under calyx of vested fruits. In 2001 they were found on 45.3% of harvested fruits at MRL orchard. However the percentage of fruits with mites in 2002 was greatly reduced to 3.5% at MRL orchard, presumably because of a added application of acaricide at late September. However percentage of fruits damage by hemipteran bugs at harvesting time was quite high 11.3 % at MRL orchards, because no application of insecticide against plant bugs.
Asparagus (Asparagus officinalis L.) needs proper post-harvest treatment to prolong its storage life. This study investigated the effect of 1-methylcyclopropene (1-MCP) on the quality and storage life of asparagus. Fresh-harvested asparagus was treated with 1-MCP ($1mg{\cdot}L^{-1}$), CEPA($10mg{\cdot}L^{-1}$), and 1-MCP($1mg{\cdot}L^{-1}$) + CEPA($10mg{\cdot}L^{-1}$) and compared with an untreated control. The carbon dioxide ($CO_2$) production, ethylene production, and morphological characteristics of the preserved asparagus were observed. The flow-system and the static-type measurement methods for ethylene and $CO_2$ production (respiration rate) were used. Weight loss, respiration rate, degree of freshness, and ethylene production were monitored during storage at $7^{\circ}C$. The results further showed that CEPA (2-chloroethylphosphonic acid) treatment had greater effects on $CO_2$ and ethylene production than using the 1-MCP process. The asparagus treated with CEPA or 1-MCP + CEPA had significantly increased the ethylene production rate compared to the control or using only 1-MCP during storage. There were no evident changes in the respiration rate of asparagus under 1-MCP treatment as compared with the control. Using the flow-system, slight differences in the rates of $CO_2$ and ethylene production were noted as compared to using the static type. Findings showed that in using the flow-system, asparagus manifested clearer results as compared with the static type. Weight loss in asparagus was significantly lower in control and 1-MCP treated samples than in those treated with CEPA. Likewise, the $CO_2$ and ethylene production of the CEPA treated samples significantly increased. The 1-MCP treatment reduced the effects of CEPA on weight loss, soluble solids content, and osmolality. The effect was not observed with exogenous ethylene as CEPA treatment had no visible effect as compared to the untreated group. Thus, 1-MCP treatment of asparagus could slightly reduce damage to the quality of asparagus during its distribution where ethylene gas is produced. Therefore, this study suggests that 1-MCP treatment can reduce the damage induced by ethylene gas on asparagus in poor distribution environments.
The cocoon breeding related national ritual ceremony exercised from the beginning time of Joseon is the 'clothing culture' that has taken its role in the ritual ceremony where it demonstrates the resolution of a state that placed importance in 'things to wear'. During the reign of King Seongjong, it enhanced the level of importance by adding the 'procedure to pick up the mulberry leaved by the queen personally'. During the reign of King Youngjo, the implication of the ritual ceremony was even more expanded that there was an new emergence of new type of national ceremony for the Joseon Era with its first ritual ceremony for woman to personally administer the memorial ceremony to the 'woman divinity' in addition to the 'Jakheonrye' procedure to personally present by the queen for the cocoon breeding. This is intended to meet the status of chingyeonguirye (farming-friendly ceremony) with King Youngjo to personally cultivate the dry field after administering Seonnongje (good harvest paying ceremony) that it is conspicuously demonstrating the importance of farming and cocoon breeding activities. As a result, the Chinjam (a type of ceremony that queen personally breeds cocoon for fabrics) related ceremonial rite that was rearranged during the reign of King Youngjo was settled into 11 ceremonial rites with the expansion of its contents. It ranges from the procedure to leave the palace for carrying out the ritual ceremony to the procedure for the crown princess and Hyebin-gung to accompany the queen, ritual for the queen to devote the Jakheonrye to exercise Chinjam, the ritual for the king to announce his royal message, johyeonui (morning assembly) exercised after completing Chinjam, it is the ritual for the queen to receive the box that contained the cocoon. This type of ritual ceremony is a significant expansion when compared with the exercise carried out earlier and it is part of characteristics displayed for ritual overhaul trend in the reign of King Youngjo. In the main procedures of these ceremonial rites, the music is accompanied and the music includes folk music, inspiration and so forth. The Chinjam related ritual ceremony in the reign of King Youngjo was established in the direction to establish it as the ritual ceremony for a woman who had the divine role of the seonjamje ritual to administer the ritual in a way of having the justification and reality to be consistent.
Research was initiated to compare establishment vigor, uniformity, rooting potential and turf quality in sods of cool-season grasses (CSG). Several turfgrasses grown under pure sand soil were tested. Establishment vigor, uniformity, rooting potential and turf quality were evaluated in the study. Turfgrass entries were comprised of three blends from Kentucky bluegrass (KB, Poa pratensis L.), perennial ryegrass (PR, Lolium perenne L.), and tall fescue (TF, Festuca arundinacea Schreb.), respectively and three mixtures among them. Differences by treatments were significantly observed in establishment vigor, uniformity, rooting potential and turf quality. Early establishment vigor was mainly influenced by germination speed, being fastest with PR, intermediate with TF and slowest with KB. In a late stage of growth, however, it was affected more by growth habit, resulting in highest with KB and slowest with TF. There were considerable variations in sod uniformity among turfgrasses. Best uniformity among monostand sods was associated with KB, while poorest one with TF. PR sod produced intermediate uniformity between KB and TF. The uniformity of polystand sods of CSG mixtures was inferior to that of monostands of KB, PR and TF, due to characteristics of mixtures comprised of a variety of color, density, texture and growth habit. The greatest potential of sod rooting was found with PR and the poorest with KB. Intermediate potential between PR and KB was associated with TF. In CSG mixtures, it was variable, depending on turfgrass mixing rates. Generally, the higher the PR in mixtures, the greater the sod rooting potential. At the time of sod harvest, however, turfgrass quality of KB was superior to that of PR. because of its characteristics of uniform surface, high density and good mowing quality. These results suggest that a careful expertise based on turf quality as well as sod characteristics like establishment vigor, uniformity and rooting potential be strongly required for the success of golf course or athletic field in establishment.
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