734 research outputs found
Effects of dietary inclusion of various concentrations of Scutellaria baicalensis extract on growth, body composition, serum chemistry and challenge test of far eastern catfish (Silurus asotus)
Effects of various concentrations of Scutellaria baicalensis (SB) extract in the diets on growth, body composition, serum chemistry and challenge test of far eastern catfish (Silurus asotus) were determined and compared to commercially available immune enhancer. Eight experimental diets were prepared in triplicate: Con diet without supplementation of SB and SB-0.25, SB-0.5, SB-1, SB-2, SB-3 and SB-5 diets containing SB at the concentrations of 0.25, 0.5, 1, 2, 3 and 5%, respectively. In addition, 0.1% commercial product of immune enhancer was included into the diet (CP). At the end of the 8-week feeding trial, ten externally normal fish from each tank were infected by Vibrio anguillarum and Streptococcus iniae. No significant difference in weight gain of fish was found. Feed consumption, feed efficiency ratio and protein retention of fish was not affected by the experimental diets. Cumulative mortality of fish fed the Con diet was higher than that of fish fed the all other diets since 10 and 25 days after V. anguillarum and S. iniae infectionm 5. Results of this study indicated that dietary inclusion of SB extract was effective to improve survival of fish after V. anguillarum and S. iniae infection, but the various concentrations of SB did not affect fish performance.Contents = i
List of Tables = ii
List of Figures = iii
Abstract (in Korean) = iv
I. Experiment = 1
Abstract = 1
1. Introduction = 3
2. Materials and methods = 5
2.1. Experimental conditions = 5
2.2. Preparation of SB and the experimental diets = 5
2.3. Chemical analysis of the experimental diets and fish = 9
2.4. Chemical analysis of blood = 9
2.5. Challenge test = 10
2.6. Statistical analysis = 10
3. Results and discussion = 11
II. Conclusion = 26
III. Acknowledgements = 27
IV. References = 2
Preparation of O-3 Polymer-based Piezoelectric Composites with (Pb_(1-x), Bi_x)(Ti_(1-y), Fe_y)O_(3) Powders
Piezoelectric materials are used extensively in many transducer applications. However they have limited utility in transducers used under hydrostatic conditions because of their low hydrostatic piezoelectric coefficient(d_h) have also limited utility in ultrasonic field due to small voltage coefficient(gββ) and large acoustic impedance.
To improve the magnitude of hydrostatic piezoelectric coefficient and voltage coefficient, the composite of piezoelectric materials and polymer with different patterns have been prepared. In addition, these composites having lower acoustic impedance and smaller dielectric constant than those of solid piezoelectric materials, make it easier to obtain good impedance matching with water of the human body.
Because of these advantages, piezoelectric composites would be used in many fields such as measuring instruments, diagnostic ultrasonic transducer, information processing instruments and acoustic devices.
Especially, these composites have advantage of making a shape using ceramic powder that cannot produce by sintering.
In this study, we produced the composites using (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ powder which cannot produce by sintering because of its high tetragonality that create high inner stress. (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ/Epoxy 0-3 piezoelectric composites were prepared for investigating the effects of volume fraction of (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ on the dielectric, piezoelectric properties of composites. (Pb_1-x Bi_x)(Ti_1-y Fe_y)Oβ powder, which has high tetragonality and voltage coefficient(gββ) was prepared from oxide mixture of PbO, BiβOβ, TiOβ and FeβOβ. Then, (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ particles were mixed with epoxy, piezoelectrically inactive species. After poling, dielectric, and piezoelectric properties were investigated.1. μλ‘ = 1
2. μ΄λ‘ μ λ°°κ²½ = 3
2.1 μμ μ΄λ‘ = 3
2.2 μμ 볡ν©μ¬λ£ = 5
2.2.1 μΈλΌλ―Ή-ν΄λ¦¬λ¨Έ 볡ν©μ²΄μ μμ© = 5
2.2.2 볡ν©μ²΄μ μ°κ²°μ± = 8
2.3 볡ν©μμ¬μ μ μ νΉμ±μ λν μ΄λ‘ = 11
3. μ€νλ°©λ² = 13
3.1 (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ powder ν©μ± = 13
3.2 (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ/ polymer 볡ν©μ²΄μ μ μ‘° = 17
3.3 μ κ·ΉλΆμ°© λ° Hysteresis loop μΈ‘μ = 20
4. κ²°λ‘ λ° κ³ μ°° = 22
4.1 (Pb_1-x, Bi_x)(Ti_1-y, Fe_y)Oβ powder νΉμ± = 22
4.2 (Pb_0.5, Bi_0.5)(Ti_0.5, Fe_0.5)Oβ/ polymer 볡ν©μ²΄μ νΉμ± = 27
5. κ²°λ‘ = 37
μ°Έκ³ λ¬Έν = 3
Efficient Measurement System to Investigate Micro-Doppler Signature of Ballistic Missile
Micro-Doppler (MD) shift caused by the micro-motion of a ballistic missile (BM) can be very useful to identify it. In this paper, the MD signatures of three scale-model BMs are investigated using a portable measurement system. The measurement system consists of an X-band 2-by-2 phase comparison mono-pulse radar, and a mechanical device that can impart controlled spinning and coning motions simultaneously to a model to yield the MD signature that replicates the characteristic of each target and the corresponding micro-motion. The coning motion determined the overall period of MD, and the spinning motion increased its amplitude. MD was also dependent on aspect angle. The designed system is portable, and can implement many micro-motions; it will contribute to analysis of MD in various situations.110Ysciescopuskc
A Study on the Improvement of Corrosion Resistance at Ship's Ballast Tank Steel Material by Effective Paintings and Hot-dip Coatings
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μΌλ°μ μΌλ‘ μ λ°μ 건쑰과μ μ μμ΄μ νμ¬κΉμ§μ κ°μ₯ μ ν¨ν λ°©μμλ¨μ λμ₯μ μν΄ νΌλ°©μμ²΄μΈ μ 체λ₯Ό νΌλ³΅νλ λ°©λ²μ΄λ€. ννΈ μ΄λ¬ν λμ₯νΌλ³΅μ κ²½μ°λ λ΄κ΅¬μλͺ
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λ° κ²μ¬κ° μνλμ΄ μλ€. μ΄μ κ΅μ ν΄μ¬κΈ°κ΅¬(International Maritime Organization, IMO)μμλ μ΄λ¬ν λμ₯ λ°©μλ²μ λ¬Έμ μ μ ν΄κ²°νκΈ° μνμ¬ κ΅μ ν΄μ¬κΈ°κ΅¬μ μ°νμ‘°μ§μΈ ν΄μμμ μμνλ₯Ό ν΅νμ¬ μ λ°μ λ°Έλ¬μ€νΈ ν±ν¬ λ° μ΄μ€ μ μΈ‘ 곡κ°μ λν 보νΈλμ₯ μ±λ₯ κ·μ (PSPC : performance standard for protective coatings)μ 2005λ
λμ μ μ νμκ³ 2008λ
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μ 2 μ₯ μ΄λ‘ μ λ°°κ²½ 3
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2.1.1 κΈμμ λΆμ μ리 3
2.1.2 κΈμλΆμμ μ’
λ₯ 10
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λ₯ λ° νκ° 15
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2.2.1 μ λ° λμ₯μ λͺ©μ 20
2.2.2 μ λ° λμ₯μ λ°©λ² 20
2.2.3 κ΅μ ν΄μ¬κΈ°κ΅¬ 보νΈλμ₯μ±λ₯κ·μ νμ½ λ΄μ© 22
2.3 λ³Έ μ°κ΅¬μ© μ μ λ΄μμ½ν
μ κ°μ 25
2.3.1 P.E λ° P.A μ½ν
μ κ°μ 25
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2.3.3 μ©μ΅ λκΈμ κ°μ 32
μ 3 μ₯ μ€ν λ°©λ² 44
3.1 P.E, P.A, μ μνμ μ½ν
λ° μ©μ΅λκΈμ μ μ쑰건 44
3.2 P.E, P.A, μ μνμ μ½ν
λ° μ©μ΅ λκΈ λ§μ λ΄μμ± νκ° 49
3.2.1 μ κΈ° ννμ μκ·Ή λΆκ·Ή λ° μ μ μ μ€ν 49
3.2.2 μ κΈ° ννμ μνΌλμ€ 51
3.2.3 μμ° μ μ μΈ‘μ 51
3.2.4 μΌμ λΆλ¬΄ μν 52
μ 4 μ₯ μ€νκ²°κ³Ό λ° κ³ μ°° 55
4.1 μ λ°μ λΆμ νν©μ‘°μ¬ 55
4.2 P.E, P.A, μ μνμ μ½ν
λ° μ©μ΅λκΈ λ§μ μ μ κ²°κ³Ό 60
4.3 μ μ λ§μ μ κΈ°ννμ λΆκ·Ή νΉμ± 66
4.4 μ μ λ§μ μ κΈ°ννμ μνΌλμ€ νΉμ± 72
4.5 μ μ λ§μ μμ°μ μ μΈ‘μ κ²°κ³Ό 77
4.6 μ μ λ§μ μΌμλΆλ¬΄ μ€ν κ²°κ³Ό 82
μ 5 μ₯ κ²°λ‘ 94
μ°Έκ³ λ¬Έν 96
κ°μ¬μ κΈ 9
Synthesis of fluorescent naphthalimide functionalized Fe3O4 nanoparticles and their application for the selective detection of Zn2+ present in contaminated soil
νμλ
Όλ¬Έ (μμ¬)-- μμΈλνκ΅ λνμ : 건μ€ν경곡νλΆ, 2017. 2. λ°μ€λ².A fluorescent dopamineβnaphthalimideβdipicolylamine (DPA) was synthesized as a sensing receptor for Zn2+. Naphthalimide-DPA (2) was immobilized onto the surface of iron oxide nanoparticle to prepare a hybrid nanomagnet 1-Fe3O4 for the purpose of selective detection of Zn2+ in soil. NaphthalimideβDPA (2) and 1-Fe3O4 were observed to bind with Zn2+, leading to significant increase in fluorescence intensity at 527 nm. The fluorescence increases of 2 (10 ΞΌM) and 1-Fe3O4 (0.33 wt%) by addition of Zn2+ were linear over the [Zn2+] range of 0β7 ΞΌM and 0β20 ΞΌM, respectively. These fluorescence changes were highly selective for Zn2+, which were readily monitored even in the presence of other competitive cations. In particular, 1-Fe3O4 exhibited an excellent limit of detection determined to be 0.0345 ppb. Furthermore, this system was found to be suitable for detecting Zn2+ in a wide pH range of 3β11 and could be reused with the addition of ethylenediaminetetraacetic acid (EDTA). Moreover, nanomagnet 1-Fe3O4 was employed for the selective detection and removal of Zn2+ from a soil sample. These results confirm that the use of 1-Fe3O4 is a novel and simple method for detecting Zn2+ in environmental samples.Chapter 1 Introduction 1
1.1 General 1
1.2 Outline 4
Chapter 2 Background 5
2.1 Background of the Fluorescence Chemosensor 5
2.1.1 Fluorecence 5
2.1.2 Photo-induced Electron Transfer 6
2.1.3 Chelation Enhanced Fluorescence 8
Chapter 3 Experimental Program 9
3.1 Materials and instruments 9
3.2 Spectroscopic methods 9
3.3 Detemination of limit of detection for 1-Fe3O4 10
3.4 Synthesis 11
3.4.1 Synthesis of iron-oleate complex 11
3.4.2 Synthesis of iron oxide nanocrystals 11
3.4.3 Synthesis of 1-Fe3O4 11
3.4.4 Synthesis of 1β5 13
3.4.5 Synthesis of 1 13
3.4.6 Synthesis of 2 16
3.4.7 Synthesis of 3 18
3.4.8 Synthesis of 4 21
3.5 Soil sampling, spiking, and extraction 24
Chapter 4 Experimental Results and Analysis 25
4.1 Synthesis and characterization of nanomagnet 1-Fe3O4 25
4.2 Spectroscopic analysis of the response of 2 to Zn2+ 29
4.2.1 Selectivity of 2 to Zn2+ 29
4.2.2 Zn2+ titration test of 2 34
4.2.3 pH titration test of 2 37
4.2.4 Reversibility test of 2 38
4.3 Spectroscopic analysis of the response of 1-Fe3O4 to Zn2+ 39
4.3.1 Selectivity of 1-Fe3O4 to Zn2+ 39
4.3.2 Response time of 1-Fe3O4 to Zn2+ 42
4.3.3 Zn2+ titration test of 1-Fe3O4 43
4.3.4 Reversibility test of 2 45
4.4 Detection of Zn2+ in soil samples 46
Chapter 5 Conclusions 48
Bibliography 49
μ΄λ‘ 54Maste
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