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Reactivities of $Li_2ZrO_3/$honeycomb for $H_2S$ Removal ($H_2S$ 제거를 위한 $Li_2ZrO_3$/honeycomb의 반응 특성)

  • Park, Joo-Won;Kang, Dong-Hwan;Lee, Bong-Han;Yoo, Kyung-Seun;Lee, Jae-Gu;Kim, Jae-Ho;Han, Choon
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.12
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    • pp.1347-1352
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    • 2005
  • [ $H_2S$ ] removal reaction using $Li_2ZrO_3/honeycomb$ has been carried out in a fixed bed reactor for the cleaning of syngas from the waste gasifier. $Li_2ZrO_3$ was synthesised using reagent-grade $Li_3CO_3$ and $ZrO_2$ with suitable amount of ethanol in a 1:1 ratio. And then $Li_2ZrO_3$ were calcined in air at $850{\sim}1000^{\circ}C$ for 14 h. The optimum condition of $H_2S$ removal reaction is around 20 wt% $Li_2ZrO_3$/honeycomb at 300 mL/min and $700^{\circ}C$. At this condition, removal amount of $H_2S$ was about 0.337 $g^{H_2S}/g^{sorbent}$. Addition of $K_2CO_3$, $Na_2CO_3$, NaCl and LiCl in the $Li_2ZrO_3$ remarkably improves the $H_2S$ removal capacity of modified $Li_2ZrO_3$/honeycomb up to 23%. Analyses of $Li_2ZrO_3/honeycomb$ sorbent by SEM and XRD showed that $Li_2ZrO_3$ was uniformly impregnated into honeycomb up to considerable amounts. Furthermore, the physicochemical properties of the sorbent did not vary much up to $1000^{\circ}C$.

The Effect of Pressure and Hose Length on the Travelling Distance of Particles in Power Sprayer (토출압력(吐出壓力) 및 호오스길이가 도달성(到達性)에 미치는 영향(影響)에 관(關)한 연구(硏究))

  • Kwon, Soon Hong;Choi, Kyu Hong
    • Journal of Biosystems Engineering
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    • v.7 no.2
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    • pp.30-35
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    • 1983
  • To investigate the factors affecting the transportability of spray droplets, the maximum distance, the effective distance, the ratio of even distribution, and the diameters of particles were measured in accordance with the different pressure levels of power sprayer using 3 hole swath type nozzle, and the results are summerized as follows; 1. The distance of the most dense point from the nozzle was shortened by 0.5 meter with the 100-meter-long hose. The maximum reaching distances were reduced by 1.5 and 1.0 meters for the 13m/m and the 8.5 m/m hoses respectively, and the effective distance were reduced by 0.5 meter for both cases. 2. The effective distance can not be extended beyond 14 meters even if the length of hose is minimized at the rated pump pressure 28 kg/$cm^2$, it was 1 meter longer for 13m/m hose compared to the 8.5m/m one. 3. In case of 13m/m hose, the most dense point can be extended further by 0.5 meter increasing the pump pressure by 8 kg/$cm^2$, and the maximum distance and effective distance were increased by 2.0 and 0.5 meters respectively. There was no significant effect of pressure changes on the transportability in case of 8.5m/m hose. 4. Both the reduction of hose length and the increase of pump pressure influenced in large extent to the atomization effect of droplets. It was noticed that the diameter of droplet is related to the pump pressure and inside diameter of hose. 5. The pressure drop in 100-meter-long and l3m/m hose was 5~7kg/$cm^2$ at the pump pressure range of 25~33kg/$cm^2$, and it is an equivalent of 2% per 10 meter length of hose.

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Physico-chemical Properties and Changes of Sarcoplasmic Protein Bands of Chicken Meat Cuts with or without Salt during Cooking Temperatures (식염첨가 유무에 따른 계육의 부위별 가열온도에 따른 이화학적 성상과 근장 단백질 밴드의 변화)

  • Kim, Soo-Hee;Chin, Koo-Bok
    • Journal of Animal Science and Technology
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    • v.49 no.2
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    • pp.269-278
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    • 2007
  • This study was performed to measure the pH, proximate composition, physicochemical properties, changes of protein bands, Hunter color values and endpoint cooking temperature of chicken leg and breast muscles during cooking from 64 to 74℃ with 2℃ increments. Chicken leg had higher pH, moisture and fat contents (%) and lower protein solubility(P<0.05) than chicken breast. Although the cooking losses(CLs, %) of chicken muscles increased with increased cooking temperature, the addition of 2% salt did not affect CL. The redness values of chicken leg without 2% salt were higher than chicken breast, however, the addition of 2% salt reduced the differences of the redness. Protein solubility decreased with increased cooking temperatures and were not affected by the addition of salt, and no further changes were observed higher than 68℃. Protein bands having the molecular weights of 66 and 54kDa were disappeared in the chicken leg at the cooking temperatures of 66~70℃, whereas 66, 54 and 34kDa in the chicken breast. These protein bands could be used potential indicators to determine the endpoint cooking temperature in chicken muscles.

Risk Assessment of Fipronil on Honeybee (Apis mellifera) (Fipronil의 꿀벌 (Apis mellifera)에 대한 위해성 평가)

  • Kim, Byung-Seok;Yang, Yu-Jung;Park, Yeon-Ki;Jeong, Mi-Hye;You, Are-Sun;Park, Kyung-Hun;Ahn, Young-Joon
    • The Korean Journal of Pesticide Science
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    • v.13 no.1
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    • pp.39-44
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    • 2009
  • This study was conducted to evaluate the actual risk of fipronil on worker honey bees (Apis mellifera L.) through acute contact toxicity test, acute oral toxicity test, toxicity of residues on foliage test, and small scale field test. The $48h-LD_{50s}$ of fipronil SC on honeybee were $0.005{\mu}g$ a.i./bee in acute contact toxicity test and $0.004{\mu}g$ a.i./bee in acute oral toxicity test, respectively. In toxicity of residues on foliage test, fipronil showed over 90% of mortality during 28days after treatment at recommended application rate. The $DT_{50}$ of dislodgeable foliar residue was 9 days. Finally, In small scale field test, fipronil showed similar toxicity in the residues on foliage test. It was concluded that fipronil has very high acute toxicity and long residual toxicity to honeybee. Therefore, fipronil is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees are visiting the treatment area. To protect honeybee and wild pollinators from outdoor use of fipronil, ultimately it should need to limit for only indoor use to prevent pollinators from unintentionally exposure of fipronil.

Exposure Assessment of Apple Orchard Workers to the Insecticide Imidacloprid Using Whole Body Dosimetry During Mixing/Loading and Application (전신복장법을 이용한 농약 조제 및 살포 과정 중 살충제 Imidacloprid에 대한 사과 과수원 농작업자의 노출 평가)

  • Lee, Jae Yun;Noh, Hyun Ho;Park, Hyo Kyoung;Jeong, Hye Rim;Jin, Me Jee;Park, Kyung-Hun;Kim, Jeong-Han;Kyung, Kee Sung
    • The Korean Journal of Pesticide Science
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    • v.20 no.3
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    • pp.271-279
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    • 2016
  • To evaluate exposure characteristics of the insecticide imidacloprid to apple orchard workers during treatment on orchard fields and evaluate its potential risk using a whole body dosimetry (WBD) method, 1,000-time diluted acephate+imidacloprid 25(20+5)% solutions were sprayed on 10 apple orchard fields in Cheongju with a speed sprayer at a rate of 3,000 L/ha/person, after put on clothes such as inner/outer clothes, personal air pump with a IOM sampler, nitrile glove and mask. Exposure test included mixing, loading and application steps. The test pesticide imidacloprid residues in the collected samples were analyzed with a HPLC-DAD. Recoveries ranged from 81.5 to 108.6% for analytical method validation and from 73.8 to 86.7% for field recovery. Total exposed amounts to mixer/loader and applicator were found to be 0.0014-0.0279% of total applied active ingredient of imidacloprid. Glove exposure of both mixer/loader and applicator was higher than the other parts. Margins of safety of mixer/loader and applicator were calculated to be 97-355 and 46-196, respectively, indicating that exposure risk of imidacloprid to apple orchard workers by spraying with a speed sprayer was very low.

Studies on Plasma Homocysteine Concentration and Nutritional Status of Vitamin $B_6, B_12$ and Folate in College Women (일부여대생의 혈장 호모시스테인 함량과 비타민 $B_6, B_12$ 및 엽산 영양상태)

  • 안홍석;정은영;김수연
    • Journal of Nutrition and Health
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    • v.35 no.1
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    • pp.37-44
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    • 2002
  • The purpose of this study was to provide a reference range for plasma homocysteine and to explore the relation between plasma homocysteine and nutritional indexes in a Korean college women. Thirty women were selected from college students in Seoul area With mean age of 22.4y. Dietary intakes of Vitamins B$_{6}$, B$_{12}$, folate were estimated from a 3 day food diary method and plasma homocysteine concentration was mearsured as well as the levels of blood vitamins. The results obtained are as follows. Mean daily intake of energy, vitamin B$_{6}$, B$_{12}$, and folate were 1731.9kcal, 0.9mg, 2.2mg and 139.8$\mu\textrm{g}$ respectively. Mean plasma homocysteine concentration was 12.4$\mu$mol/l with a range between 6.7 and 17.8$\mu$mol/l and the mean concentrations of plasma vitamin B$_{6}$(PLP), serum vitamin $_{12}$, Serum folate and RBC folate were 77.5nmol/l, 267.4pmol/l, 17.1 nmol/l and 736.5nmol/l arid 736.5nmol/l respectively. we found a negative correlation between plasma homocysteine concentration and dietary vitamins, and blood levels of vitamin although it was not significant.

Mitochondrial DNA Copy Number in the Patients of Korean Polycystic Ovary Syndrome (PCOS) (한국인 다낭성난소증후군 환자에서 미토콘드리아 DNA Copy 수의 정량적 분석)

  • Park, Ji-Eun;Jang, Min-Hee;Cho, Sung-Won;Kim, Yoo-Shin;Won, Hyung-Jae;Cho, Jung-Hyun;Baek, Kwang-Hyun;Lee, Sook-Hwan
    • Clinical and Experimental Reproductive Medicine
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    • v.33 no.4
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    • pp.245-251
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    • 2006
  • Objective: We analyzed quantification of mitochondria DNA (mtDNA) to investigate the relationship of mitochondria and pathogenesis of PCOS. Materials and Methods: Peripheral blood samples were collected from 28 patients with PCOS who were under the inclusion criteria for PCOS and from 28 healthy controls. Genomic DNA was used to analyze real-time PCR for mtDNA copy number quantification. The mtDNA copy number was compared between the control and PCOS groups. All data was expressed as mean ${\pm}$ SD. Statistical analysis was assessed by t-test. Results: In this study, the mtDNA $C_T$ was $11.67{\pm}0.422$ in PCOS patients and $11.51{\pm}0.722$ in control group, respectively. The mtDNA copy number was $1726410.71{\pm}407858.591$ the patients of in PCOS and $2167887.51{\pm}252459.28$ in control group (p=0.08), respectively. Conclusion: In our study, using real-time PCR, there was a tendency of lower mtDNA copy number in the patients of PCOS when comparing to the control group even though statistical difference was not significant. However, more extensive analysis is required to clarity relationship between mtDNA copy number and pathogenesis of PCOS.

Comparison of Germination Characteristics and Daily Seed Germinating Pattern in New Cultivars of The Third Generation of Creeping Bentgrass Grown under Alternative and Natural Room Temperature Conditions (자연실온 및 변온조건에서 제3세대 크리핑 벤트그래스 신품종의 발아특성 및 일일 발아패턴 비교)

  • Kim, Kyoung-Nam;Kwon, O-Dal;Shim, Sang-Ryul;Yoon, Jung-Seo;Park, So-Hyang
    • Asian Journal of Turfgrass Science
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    • v.25 no.1
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    • pp.1-10
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    • 2011
  • This study was conducted to investigate early germination characteristics and germination pattern of new cultivars of creeping bentgrass (CB, Agrostis pall/stris Huds.) under natural room temperature conditions and to analyze differences between alternative and natural conditions. Seven cultivars of CB were tested in the study. Daily and cumulative germination patterns were measured and analyzed on a daily basis. Significant differences were observed in germination pattern, days to the first germination, days to 50% germination, days to 85% germination, and germination rate among cultivars under different environments. The first germination in all entries was initiated between 4 and 5 days after seeding (DAS) under alternative conditions, while between 6 and 8 DAS under natural conditions, being 2 to 3 days later as compared with that of alternative conditions. As for the first germination percentage, it was generally 5 to 25% under alternative conditions. However, 'Penn A-1', 'Penncross', and 'Penn A-4' cultivars showed a vigorous germination, producing 50 to 70%. Under natural room temperature conditions, it was 5 to 10% for the most entries, except 'Penncross', 'L-93', and 'Penn A-4' cultivars which vigorously produced 20 to 50%. Days to the 50% germination in CB resulted in 4 to 10 DAS under alternative conditions, while 6 to 15 DAS under natural conditions, being 2 to 5 days later than under alternative conditions. Days to the 85% germination were 5.90 to 11.75 DAS under alternative conditions and 7.95 to 12.50 DAS under natural conditions. 'Penn A-1' and 'L-93' were the fastest cultivars under alternative and natural conditions, respectively. Regardless of the temperature conditions, the longest cultivar in germination was 'T-1', being over 11 DAS. In-depth comparative data on germination characteristics and germination patterns among CB cultivars would be usefully applied for a practical CB turf establishment in golf course construction etc.

A Clinical Study on Macrosomia (거대아에 대한 임상적 연구)

  • Lee, Kang-Won;Kim, Jong-Wook;Lee, Tae-Hyung;Park, Wan-Seok;Lee, Sung-Ho;Chung, Wun-Youn
    • Journal of Yeungnam Medical Science
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    • v.3 no.1
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    • pp.293-299
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    • 1986
  • Obstetric problems concerning macrosomia were evaluated by retrospective review of 91 pregancies that resulted in the delivery of an infant weighing 4,000gm or more at the Yeungnam University Hospital during 3 1/2 years from Jun. 1983 to Oct. 1986. The results obtained were as follows. 1. Macrosomic infants weighing 4.000gm or more occured in 2.8% of the deliveries. 2. 65.9% of macrosomic infants and 53.5% of total infants were male. The ratio of male was statistically higher in the macrosomic infants than in the total infants(P<0.05). 3. The incidence of macrosomia was higher with increasing qestational age, and deliveries at 42 weeks or more gestation were more common in the macrosomic infants than in the total infants(P<0.01). 4. The incidence of macrosomia was highter with increasing parity, and stastically higher in the multipara than in the primipara(P<0.01). 5. There was no difference in the incidence of macrosomia between the mothers aged 24 or less and that of 30 or more. 6. The cesarean section rate of macrosomia(30.8%) was stastically higher than that of the total infants(15.7%)(P<0.01) 7. With the pregnacy and delivery of macrosomic infants, 22 antepartum anemia(24.2%), 10 postpartum hemorrhage(11.0%), 9 birth canal injury(10.0%), 7 prolonged second stage of labor (7.7%), 4 breech presentation, and 3 pregancy induced hypertension occured in the mothers, and 10 asphyxia(or Apgar score 6 or less), 2 shoulder dystocia, 1 intrauterine fetal death, and 1 sacrococcygeal teratoma occured in the infants.

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American Culture at the Crossroad : Debates over NEA(National Endowments for the Arts) (미국 문화, 그 기로에 서서 - NEA(국립예술진흥기금)를 둘러싼 논쟁 중심으로)

  • Kim, Jin-A
    • The Journal of Art Theory & Practice
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    • no.4
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    • pp.33-56
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    • 2006
  • The cultural debates between conservatives and liberals at the end of the 1980s and in the early 1990s were termed as "culture wars." The "culture wars" involved a diverse range of controversial issues, such as the introduction of multicultural curricula in educational institutions, prayers in schools, whether to allow gays to serve openly in the military, and whether abortion should be permitted. The most heated debates of the "culture wars" regarding art raged over the NEA and the question of whether Andres Serrano's works should have been publicly funded, in addition to the exhibition "Robert Mapplethorpe: The Perfect Moment" which were charged as projecting "obscene" or "blasphemous" images. This paper examines the development of culture wars in art and focuses on several issues invoked by the NEA debates. However, it is not a detailed chronological investigation. Rather it pays attention to the several phases of the debates, analyzing and criticizing the clashes of the political and esthetical points of views between conservatives and liberals. How could NEA funding, a mere fraction of the federal budget, have become so critical for both sides(conservative and liberal), for politicians and artists' groups, and for academics and the general public? The art community was astounded by this chain of events; artists personally reviled, exhibitions withdrawn and under attack, the NEA budget threatened, all because of a few images. For conservative politicians, the NEA debate was not only a battle over the public funding of art, but a war over a larger social agenda, a war for "American values and cultures"based on the family, Christianity, the English language, and patriarchy. Conservative politicians argued the question was not one of "censorship" but of "sponsorship," since the NEA charter committed it to "helping museums better serve the citizens of the United States."Liberals and art communities argued that the attempt to restrict NEA funding violated the First Amendment rights of artists, namely "free speeches." "No matter how divided individuals are on matters of taste," Arthur C. Danto wrote, "freedom is in the interest of every citizen." The interesting phase is that both sides are actually borrowing one another's point of view when they are accompanied by art criticism. Kramer, representative of conservative art critic, objected the invasion of political contents or values in art, and struggled to keep art's own realm by promoting pure aesthetic values such as quality and beauty. But, when he talked about Mapplethorpe's works, he advocated political and ethical values. By contrast, art experts who argued for Mapplethorpe's works in the Cincinnati trial defended his work, ironically by ignoring its manifest sexual metaphor or content although they believed that the issues of AIDS and homosexuality in his work were to be freely expressed in the art form. They adopted a formalistic approach, for example, by comparing a child nude with putti, a traditional child-angel icon. For a while, NEA debates made art institutions, whether consciously or unconsciously, exert self-censorship, yet at the same time they were also producing positive aspects. To the majority of people, art was still regarded as belonging to the pure aesthetic realm away from political, economical, and social ones. These debates, however, were expanding the very perspective on the notion of what is art and of how art is produced, raising questions on art appreciation, representation, and power. The interesting fact remains: had the works not been swiped in NEA debates, could the Serrano's or Mapplethorpe's images gain the extent of power and acceptance that it has today?

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