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On the creosote losses of treated wood blocks (처리목편(處理木片)의 크레오소-트유(油) 손실(損失)에 관(關)하여)

  • Lee, Phill Woo
    • Journal of Korean Society of Forest Science
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    • v.3 no.1
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    • pp.5-9
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    • 1963
  • 1. Creosote in treated wood that exposed in open areas of outdoor is gradually lost by elapse of some period of time. This is the interst and important problem relating to decide the effect on the life extension of creosoted wood. As a general preservative losses occurring in wood treated by oil born preservative such as creosote oil are taken place boy the evaporating and washing activities of the exposed surfaces of wood due to the climatic conditions. Accordingly author intend to inspect differences in retention among species showing after creosoted blocks had been treated by evaporating and washing alternately for a definite time in the laboratory. 2. In this study rail road tie woods of Quercus aliena Blume, Fagus crenata Blume and Fraxinus mandchurica Ruprecht which entered into area for treatment at the plant, locating in Suwon, Korea, were selected to the test species. $2{\times}2{\times}2$ centimeter forty small wood blocks for each species were cut, treated by the mixed solution of equal 50% creosote and heavy oil (hot and cold method), and inspected absorption percents. After evaporation and washing treatments alternately to the intervals of definite time had been accomplished, the losses of creosote were inspected. 3. According to the results Quercus Fagus and Fraxinus are showing the values of 37.9, 87.3 and 59.3% in absorption, and these values were reduced into 28.7, 63.8 and 44.4% respectively by evaporating and washing treatments for a definite time. These indicate that losses of ease absorbing species are greater than difficult one and on the contrary difficult are lesser. However above reduced values are calculated to the 24.3, 26.9 and 25.1% when the absorption percents of each species were assumed as 100% retention respectively. Therefore actual differences of losses among species are lesser than those of absorption percents.

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Clinical analysis of tuberculous cervical lymphadenitis (경부 결핵성 임파선염의 임상적 고찰)

  • 김영민;송병찬;윤성철;박영민
    • Proceedings of the KOR-BRONCHOESO Conference
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    • 1993.05a
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    • pp.107-107
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    • 1993
  • Tuberculous cervical lymphadenitis is one of the most common causes of neck mass in Korea. But the diagnostic confirmation is difficult and it's effective treatment modalities are still in controversy. Through a retrospective study of 32 cases of tuberculous cervical lymphadenitis treated with surgical treatment during recent 4 years, we have analyzed 5 subtypes of CT finding and surgical treatment modalities and received following results 1. The locations of lymphadenitis were posterior triangle(12 cases), submandibular area(9 cases), supraclavicular area(8 cases), submental area(2 cases), and parotid area(1 case). 2. Five subtypes of CT findings were observed : Homogeneous enhancement type(3 cases), peripheral rim enhancement type(6 cases), peripheral rim enhancement with perinodal fat obliteration type(12 cases), coalescent cold abscess type(8 cases), and mixed type(3 cases). 3. Surgical treatment modalities : Excision (13 cases), incision and drainage(9 cases), selective neck dissection(8 cases), and curettage(2 cases).

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Study on the Off-design Performance on a Plug Nozzle with Variable Throat Area

  • Azuma, Nobuyuki;Tanatsugu, Nobuhiro;Sato, Tetsuya;Kobayashi, Hiroaki;Hongo, Motoyuki
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.03a
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    • pp.644-648
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    • 2004
  • In the present study were examined numerically and experimentally the off-design performance characteristics on an axisymmetric plug nozzle with variable throat area. In this nozzle concept, its throat area can be changed by translating the plug into the axial direction. First, a mixed-expansion plug nozzle, in which two expansion parts are arranged both inside and outside, was designed by means of the method of characteristics. Second, the CFD analysis was verified by the cold-flow wind tunnel test. Third, its performance characteristics were evaluated over a wide range of pressure ratio from half to double throat area through the design point, using the CFD code verified by the wind tunnel tests. It was made clear from the study that not so critical thrust efficiency losses were found and the maximum thrust efficiency loss was at most approximately 5 % under off-design conditions without external flow. This result shows that a plug nozzle can give the altitude compensation even under off-design geometry operations. However, shock waves were observed in the inner expansion part under the doubled throat area operation and thus some thermal problems may be caused on the plug surface. Furthermore, collapse of cell structure on the plug surface was observed with external flow (around Mach number 2.0) as it became lower pressure ratio below the design point and the fact may result in big efficiency loss regardless of geometrical configuration.

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Flame Retardance and Thermal Resistance of CPE Rubber Compound Containing a Phosphoric Ester Flame Retardant BDPDH (인산 에스테르게 난연제 BDPDH를 첨가한 CPE 고무재료의 난연성 및 내열성)

  • Park, Hyun-Ho;Lee, Chang-Seop
    • Elastomers and Composites
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    • v.38 no.1
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    • pp.72-80
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    • 2003
  • Phosphoric ester compound was employed as thermal resistant and flame retardant for chlorinated polyethylene(CPE) rubber material which is used to prepare automotive oil cooler hose. Cure characteristics, physical properties, thermal resistance, and flame retardation of CPE rubber compounds were investigated. CPE rubber which has excellent properties such as cold resistance and chemical corrosion resistance, and is inexpensive in price than existing ethyleneacrylate rubber(EAR) was used to prepare a rubber compound useful for hose. A non-halogen flame retarding agent N,N'-bis- (diphenylphosphoro) diaminohexane(BDPDH), which is condensed phosphoric ester, was synthesized and it was mixed to CPE rubber material with the range of $0{\sim}30 phr$. From the test results, rheological properties, heat resistance, and flame retardance of CPE rubber compounds were found out to be much increased. The optimum content of BDPDH to rubber which gives maximum effect on thermal resistance and flame retardation, within the range of tolerable specification for rubber materials, was determined to be 20 phr.

Shelf-Life Extension and Increase in Survivability of Probiotics Powder by Ultrasonic Treatment (초음파를 이용한 프로바이오틱스 분말의 유통기한 연장 및 생존율 증대 효과)

  • Hong, Dong-Ki;Jung, Seong-Eun;Lee, Myoung-Hee;Lee, Ho-Jin;Lee, Jae-Ho;Na, Guk-Nam;Choi, Il-Dong;Lee, Jung-Lyoul;Sim, Jae-Hun
    • Journal of Dairy Science and Biotechnology
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    • v.36 no.4
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    • pp.220-225
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    • 2018
  • The purpose of this study was to investigate the effect of ultrasonic treatment during probiotics production process on the shelf life and the survival rate. Once Lactobacillus plantarum and Bifidobacterium longum were cultured in edible culture medium, ultrasonic treatment was performed at 100 Hz for 1, 2, 5, 7, and 10 minutes. Ultrasonic-treated L. plantarum HY7715 and B. longum HY8001 were centrifuged, mixed with a cryoprotectant, and lyophilized. The prepared lactic acid bacteria powder was individually packaged. After 6 months, viable cell counts were measured separately under cold storage and room temperature. In vitro digestion experiments were performed to determine the survival rate at digestive tract. As a result, it was observed that shelf life and survival rate were increased compared to untreated control group.

Effects of gelatin and oxytocin supplementation in a long-term semen extender on boar semen quality and fertility potential

  • Vibuntita Chankitisakul;Nalinee Tubtimtong;Wuttigrai Boonkum;Thevin Vongpralub
    • Animal Bioscience
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    • v.37 no.2
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    • pp.210-217
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    • 2024
  • Objective: This study investigated the efficacy of different concentrations of gelatin supplementation in long-term semen extender on boar semen quality during storage for 10 days at 17℃. Additionally, oxytocin was added to stored semen to enhance fertility. Methods: In Experiment 1, boar semen was collected, diluted with gelatin at concentrations between 0% and 2.5% (w/v) and mixed with a semen extender. Then, it was kept in a refrigerator at 17℃ and stored for 10 days. In Experiment 2, the sperm quality was examined after adding 0, 5, and 10 IU oxytocin per artificial insemination dose to the most effective semen extender from Experiment 1 and placing it in a refrigerator at 17℃ for 10 days. In Experiment 3, the fertility potential in terms of non-return rate and litter size was determined using the most effective solid-stored semen supplemented with oxytocin. Results: The results indicated that sperm quality decreased with increasing storage time (p<0.05). The sperm quality in terms of total motility, progressive motility, and viable sperm with intact acrosomes and high mitochondrial potential was the highest with 1.5% gelatin supplementation (p<0.001) on all days of storage. Treatment with oxytocin did not affect sperm quality (p>0.05). The non-return rate and litter size after insemination with semen supplemented with 1.5% gelatin and 10 IU of oxytocin after 8 to 10 days of storage were comparable to those of the control group (p>0.05). Conclusion: A semen extender as a solid medium supplemented with 1.5% gelatin successfully preserved boar semen for a long storage duration. Treatment with oxytocin did not affect sperm quality. In addition, the fertility capacity using 1.5% gelatin with 10 IU oxytocin and stored for 8 to 10 days was acceptable and comparable to that of short-term storage.

Antioxidant and Antimicrobial Effects of Medicinal Herb Extract Mix in Pork Patties during Cold Storage (복합 한약재 추출물 첨가가 돈육 패티의 저온저장 중 항산화 및 항균성에 미치는 영향)

  • Choe, Jun-Ho;Jang, Ae-Ra;Lee, Bong-Deok;Liu, Xian-De;Song, Hyun-Pa;Jo, Cheor-Un
    • Food Science of Animal Resources
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    • v.28 no.2
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    • pp.122-129
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    • 2008
  • The antioxidant and antimicrobial activities of pork patties supplemented with medicinal herb extract mix were investigated. The medicinal herb extract powder was mixed at a ratio of 48.5:48.5:3.0 for Morus alba L, Lonicera flos, and Coptis chinensis, respectively. The pork was prepared and supplemented with medicinal herb extract mix (0, 0.5, 1, or 2%) and the antioxidant and antimicrobial activities were tested during storage at $4^{\circ}C$. The pH value decreased during cold storage at $4^{\circ}C$ for allsamples, however the pH of samples supplemented with herb extract mix rapidly decreased by days 5 and 10 ($p{\leq}0.05$). The total phenol content in the pork patties with herb extract mix was higher than in the control patties. The ABTS+ radical scavenging activities increased with increasing concentrations of herb extract mix from 0.5% to 2%. In addition, pork patties supplemented with herb extract mix showed an approximately 1 decimal reduction in total aerobic counts. Therefore, the addition of herb extract mix into pork patties increased the antioxidant activity and slightly improved the antimicrobial activity of pork patties during cold storage. However, the levels of added medicinal herb extract mix should be considered prior to its use in order to maintain proper sensory acceptance.

Regeneration Processes of Nutrients in the Polar Front Area of the East Sea III. Distribution Patterns of Water Masses and Nutrients in the Middle-Northern last Sea of Korea in October, 1995 (동해 극전선역의 영양염류 순환 과정 III. 1995년 10월 동해 중부 및 북부 해역의 수괴와 영양염의 분포)

  • CHO Hyun-Jin;MOON Chang-Ho;YANG Han-Seob;KANG Won-Bae;LEE Kwang-Woo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.3
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    • pp.393-407
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    • 1997
  • A survey of biological and chemical characteristics in the middle-northern East Sea of Korea was carried out at 28 stations in October, 1995 on board R/V Tam-Yang. On the basis of the vertical profiles of temperature, salinity and dissolved oxygen, water masses in the study area were divided into 5 major groups; (1) Low Saline Surface Water (LSSW), (2) Tsushima Surface Water (TSW), (3) Tsushima Middle Water (TMW), (4) North Korean Cold Water (NKCW), (5) last Sea Porper Water (ESPW). Other 4 mixed water masses were also observed. It is highly possible that the LSSW which occured at depths of $0\~30m$ in the most southern part of the study area is originated from the Yangtze River (Kiang) of China due to very low salinity $(<32.0\%_{\circ})$ relatively high concentration of dissolved silicate and no sources of freshwater input into that area. Oxygen maximum layer in the vertical profile was located near surface at northern cold waters and became deeper at the warm southern area. Oxygen minimum layer af depths $50\~100m$, which is TMW, were found in only southern area. In the vortical profiles of nutrients, the concentrations were very low in the surface layer and increased drammatically near the thermocline. The highest concentration occurred in the ESPW. The relatively low value of Si/P ratio in the ESPW (13.63) compared to other reports in the East Sea was due to continuous increase of P with depth as well as Si. The N : P ratio was about 6.92, showing that nitrogenous nutrient is the limiting factor for phytoplankton growth. The exponential relationship between Si and P, compared to the linear relationship between N and P, indicates that nitrate and phosphate have approximately the same regenerative pattern, but silicate has delayed regenerative pattern.

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Study on the Herb Remedies of ENT, Eyes, Teeth and Skin Problems (이비인후, 안, 치아 및 피부증상의 민간요법에 관한 고찰)

  • Cho, Kyoul-Ja;Kang, Hyun-Sook
    • Journal of East-West Nursing Research
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    • v.1 no.1
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    • pp.50-71
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    • 1997
  • The intention of this study is to apprehend the con. tents and methods of herb remedies that are commonly conducted when there are health-problem cases of ENT, eyes, teeth and skin. Methods of this study are divided into two stages : 1) For a period of six months from December 1994 to June 1995, some 40 persons who are believed to be well versed with herb remedies have been randomly chosen, and we made a survey on herb remedies by symptoms: and 2) we have endeavored to make their grounds evident through the studies on literatures with the focus on the basic data collected. Their results are as follows: 1) When one feels a pain in ears, such herb remedies are employed as pouring the vapor into ears, which is made by steaming Alaska pollack, or as applying or wiping with the juices of radish or the ginkgo, or' alum. Applying the radish juice is effective for sterilization and fever removal: and applying the ginkgo juice is effective for cleanliness. But, plastering alum, sesame oil or castor oil, or pouring the vapor of Alaska pollack into ears are perhaps effective but do not have any pharmacologic grounds. 2) When one bleeds at the nose, such kinds of herb remedies are applied as stimulating nose or head with cold water, pressing nose or ridge of nose, or filling up nares with mashed mugworts. In addition, they have utilized garlic or leeks. Such methods as stimulating with cold water or just pressing nose and ridge of nose is based on reasonable grounds, i.e. vasoconstriction and vascular compression ; and applying mashed garlic on the sole of foot is good for the circulation of Qui ; and the use of mugworts and leeks is based upon the pharmacological function of hemostasis. 3) When one feels a sore throat such kinds of herb remedies are employed as gargling or rinsing throat with brine, drinking hot gruel or water, or drinking the juice of mugwort, radish, ginger or Chinese quince. Gargling with brine or drinking the juice of mugwort, radish or ginger is based upon the pharmacological function of pain alleviation, fever removal, and detoxication. 4) When a boil is formed in mouth, such herb remedies are applied as spreading honey, brine or alum water, and taking gall nut, Chinese matrimony vine, lotus root, etc, for drugs. Spreading honey, brine or water that is made by infusing gallnut, Chinese matrimony vine, lotus root is based upon such functions as hematosis, astriction, antibacterial, and antiphlogistic, Alum, eggplant and licorice are said to be effective, but their pharmacological effects have no grounds. 5) When one has conjunctivitis such herb remedies are commonly applied as irrigation with brine and dropping breast milk in eyes. Moreover, such other drugs are used as plantain. shepherd's purse, and purslane, etc. The use of brine, breast milk, plantain, shepherd's purse and purslane is based upon such functions as sterilization, antiphlogistic, disinfection and pain relieving. Eriocaulon sieboldianum, bean stem, bean pod and narcissus leaves are said to be effective, but their pharmacological action have no basis. When one has a stye, such herb remedies are applied as extracting eyelashes, stimulating by a massage of middle finger, third finger or big toe, as well as sear ing with a heated bamboo comb that is fine-toothed. Other than these, plantain and nightshade's nuts are used as drugs for it. Extracting eyelashes corresponds with exclusing suppurative node and draining the stye of pus ; and the use of plantain is based upon disinfection: and nightshade's nuts are said to be effective, however, their pharmacological action has no grounds. 6) For a treatment of toothache, such herb remedies are commonly employed as rinsing mouth with brine and holding cold water or gasoline in the mouth ; and as the drugs that are believed to be effective have been Welsh onion, ginger and castor-oil, plant, etc. The use of Welsh onion is based upon pain killing, antiinflammatory actions, and the use of ginger is based upon detoxication and disinfection ; and seeds of castor-oil plants are said to be effective, but they have no pharmacological basis. 7) When one has hives, such herb remedies are commonly applied as rubbing burned straw in affected parts, exposing to its smoke, rubbing with salt, sweeping down with a broom, and spreading and drinking boiled water of trifoliate orange. The use of cassia tora seeds, walnut, aloe and radish is said to be effective. The use of cassia tor a seeds has the functions of intestinal order, anti-paralysis, etc. The use of walnut has resulted in an increase of blood by invigorating spirits ; and the use of aloe is based upon disinfection, antibiotic, anti-salt, antihistamine and detoxication action. But, the effects of radish juice and straw's smoke have no pharmacological grounds. 8) When one gets a boil, such herb remedies are commonly used as applying a plaster, paste of flour mixed with yolk, soy sauce or honey, as well as spreading pounded elm tree. Other remedies that have been said to be effective are ; heating with mugwort, brine, wild rocambole, aloe, onion, squid's bone, etc. The use of mugwort is based upon pain killing, astringent antiinflammatory and tranquility. Wild rocambole is based upon the generation and maintenance functions of cell-joining textures ; elm tree upon antiphlogistic ; aloe upon fever removal and antiphlogistic ; onion on pain killing, fever removal, antiphlogistic and tranquility ; squid's bone on astriction: and brine or vinegar on sterilization. Pine resin and gardenia seed are said to be effective, but they have no pharmacological basis. 9) When one cuts his skin, such herb remedies are commonly employed as spreading mugwort's juice or squid's bone powder, or pressing the wounds. In addition, kalopanax, onion and fine soil are employed. The use of mugwort, kalopanax and squid's bone is based upon such functions as hemostasis, sedation, pain killing, antibacterial ; and fine soil is said to be effective, but it has no pharmacological basis. 10) When one suffers from whitlow, such herb remedies are commonly utilized as heating with boiled soy sauce, spreading soybean paste, or dipping into eggs, etc. Other drugs that have been employed are onion root, brine, eggplant, potato, loach, etc. The use of onion is based upon pain killing and antiphlogistic functions ; and that of brine upon antiphlogistic function. The use of soy sauce or soybean paste, fomentation, eggplant, potato and loach is said to be effective, but it has no pharmacblogic ground. 11) For the treatment of frostbite, such herb remedies are commonly used as dipping the affected part into frozen soybean sack, using boiled water of eggplant stem, garlic caulis, onion, hot pepper, caulis. Onion is based upon antiphlogistic and tranquility actions garlic upon disintection, metabolic exacerbation, tonic and aphrodisiac actions and the use of eggplant and hot pepper is based upon help blood circulation, dissolution and excretion of waste matters in vein. 12) For the treatment of burn, such herb remedies or drugs are commonly used as cleansing with Korean gin, spreading eggs, cleansing with cold water and soap water ; and as brine, cactus, moss, soybean paste, oil, etc. The cleansing with Korean gin, cold water, soap water, brine, vinegar is based upon cleaning and sterilizing functions ; and the use of cucumber is based upon nu. trition provision, and strengthening of resisting power by adjustment of metabolism. The use of potato, cactus, moss, oil and eggs is said to be effective, but their phamacological functions are not clarified. In view of the above results, we can realize that the drugs that have been employed in herb remedies are quite diverse. However, in regard to majority of herb remedies that have been employed by symptoms, the pharmacological functions of their drugs have not been clarified, and they are merely known as effective. Furthermore, they have not been recorded in the literature as yet ; and we confirm that there have been many herb remedies that were executed without the proper knowlege of their effects. It is now our view that the results of this survey may be utilized for consulting data in regard to the use of herb remedies.

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Studies on Partition and Extraction Equilibria of Metal-Dithiocarbamate Complexes(Ⅰ). Solvent Extraction of Inorganic Trace Mercury(Ⅱ) (Dithiocarbamate 금속착물의 분배 및 추출평형 (제 1 보) 흔적량 무기수은(Ⅱ)의 용매추출)

  • Ho-Seong Choi;Jong-Moon Choi;Hee-Seon Choi;Young-Sang Kim
    • Journal of the Korean Chemical Society
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    • v.38 no.12
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    • pp.898-907
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    • 1994
  • The solvent extraction of an inorganic trace mercury in sea water samples was studied using zinc diethyldithiocabamate $Zn(DDC)_2$ as chelating agent. The $Zn(DDC)_2$ which maintained the stability of DDC- in the acidic aqueous solution in the course of extraction was synthesized from NaDDC and $ZnSO_4$ in this laboratory. The trace of mercury(Ⅱ) was extracted at pH 3.0 from 100 ml of sea water into 10ml of chloroform containing 0.05 M $Zn(DDC)_2$ by shaking for 5 minutes. And from the organic phase, the $Hg(DDC)_2$ was back-extracted into 10ml of 1 to 1 mixed acid of each 3% (v/v) nitric acid and hydrochloric acid by shaking for 25 minutes. The mercury back-extracted was determined by a cold vapor atomic absorption spectrophotometry. The trace mercury(Ⅱ) was so successfully extracted that this procedure could be applied to its determination in the sea water. That is, the recoveries of mercury in two kinds of samples into which as given amount of Hg(Ⅱ) was spiked were 90.0% and 93.3%, respectively.

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