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  • 1
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    Seawater carbonate chemistry, particulate organic particles, nutrients and species data during experiments with diatoms, 2006 (2006)
    PANGAEA
    In:  Supplement to: Kim, Ja-Myung; Lee, Kitack; Shin, Kyoungsoon; Kang, Jung-Hoon; Lee, Hyun-Woo; Kim, Miok; Jang, Pung-Guk; Jang, Min-Chul (2006): The effect of seawater CO2 concentration on growth of a natural phytoplankton assemblage in a controlled mesocosm experiment. Limnology and Oceanography, 51(4), 1629-1636, https://doi.org/10.4319/lo.2006.51.4.1629
    Details
    Publication Date: 2024-03-15
    Description: We examine the effects of seawater pCO2 concentration of 25, 41, and 76 kPa (250, 400, and 750 matm) on the growth rate of a natural assemblage of mixed phytoplankton obtained from a carefully controlled, 14-d mesocosm experiment. Throughout the experiment period, in all enclosures, two phytoplankton taxa (microflagellates and cryptomonads) and two diatom species (Skeletonema costatum and Nitzschia spp.) account for approximately 90% of the phytoplankton community. During the nutrient-replete period from day 9 to day 14 populations of Skeletonema costatum and Nitzschia spp. increased substantially; however, only Skeletonema costatum showed an increase in growth rate with increasing seawater pCO2. Not all diatom species in Korean coastal waters are sensitive to seawater pCO2 under nutrient-replete conditions.
    Keywords: µ-flagellates; Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, dissolved; Carbon, organic, particulate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or 〈 1 m**2); Counting; Cryptomonas spp.; Element analyser CHN; Entire community; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; EXP; Experiment; Experimental treatment; Field experiment; Flow injection analysis; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Infrared sensor; Kim_etal_06; Nitrate; Nitrogen, organic, particulate; Nitzschia spp.; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phosphate; Salinity; Silicate; Skeletonema costatum; Temperate; Temperature, water; Total organic carbon analyzer (TOC-VCPH)
    Type: Dataset
    Format: text/tab-separated-values, 849 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Electrical properties of paraelectric (Pb,La)(Nb,Ti)O3 thin films for dynamic random access memory devices (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 764-766 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Paraelectric (Pb,La)(Nb,Ti)O3 (PLNT) thin films were deposited by the sol-gel method on (111)Pt/Ti/SiO2/Si substrates at temperatures as low as 600 °C for the use of ULSI (ultralarge scale integration) DRAM (dynamic random access memory) capacitors. Films exhibited a regular polycrystalline cubic perovskite phase and showed the presence of paraelectricity in terms of hysteresis of capacitance–voltage (C–V) and polarization–electric field (P–E) characteristics in metal–insulator–metal (MIM) capacitors. The dielectric constants of the films are 611 for a 200 nm thick film and 619 for a 300 nm thick film in a frequency of 100 kHz. The charge storage density obtained from the polarization measurement for a 200 nm thick film was about 50 fC/μm2, while a leakage current density of 70 nA/cm2 was observed at an applied field of 100 kV/cm. These values qualify the PLNT thin films for an alternate storage node dielectric in DRAM capacitors. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116735
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  • 3
    Electronic Resource
    Electronic Resource
    Study of frequency dependent ε*(ω) in amorphous ferroelectrics: Modified generalized Langevin equation analysis (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 347-351 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We studied the frequency dependent dielectric constants of amorphous LiNbO3, KNbO3, and PbTiO3 at temperatures below the crystallization. We analyzed the real and imaginary part of dielectric constants ε′(ω) and ε″(ω) using the generalized Langevin equation modified by the space charge effect and the phenomenological frequency scaling. With this model, we can explain the low frequency dispersion and the high frequency relaxation behavior of ε′(ω) and ε″(ω) simultaneously. Our approach is new and different from our previous equivalent circuit model. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369454
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  • 4
    Electronic Resource
    Electronic Resource
    Toxin production of cyanobacteria is increased by exposure to zooplankton (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Cyanobacterial toxin production in response to direct and indirect zooplankton feeding activity was examined using four strains of Microcystis aeruginosa, of which three were previously reported to be toxic to zooplankton and one non-toxic. Direct (Microcystis cultured with zooplankton) and indirect effects (Microcystis cultured with filtered zooplankton culture media, ZCMF) were tested for the zooplankton species, Moina macrocopa, Daphnia magna or D. pulex.2. With direct exposure to zooplankton, increased mass-specific microcystin productions occurred in all Microcystis strains, with mean microcystin concentrations up to five times greater (61.5–177.3 μg g−1 dry cell) than the controls.3. With indirect exposure, mass-specific microcystin production increased over controls in three strains of M. aeruginosa. Mean maximum concentrations of microcystin during the experiment were 92.6–125.7 μg g−1 dry cell.4. These results suggest that several strains of Microcystis aeruginosa increased toxin production in response to direct and indirect exposure to herbivorous zooplankton of several species, and support the hypothesis that this response is an induced defence mediated by the release of info-chemicals from zooplankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.01107.x
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  • 5
    Electronic Resource
    Electronic Resource
    Stick-Slip Compensation of Micro-Positioning Using Elastic-Plastic Static Friction Model (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 246-249 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, a stick-slip compensation for the micro-positioning is presented using thestatistical rough surface contact model. As for the micro-positioning structure, PZT (lead(Pb)zirconia(Zr) Titanate(Ti)) actuator is used to drive the load for precise positioning with its highresolution incorporating with the PID (Proportional Integral Derivative) control algorithm. Since thestick-slip characteristics for the micro structures are highly nonlinear and complicated, it is necessaryto incorporate more detailed stick-slip model for the applications involving the high precision motioncontrol. Thus, the elastic-plastic static friction model is used for the stick-slip compensationconsidering the elastic-plastic asperity contact in the rough surfaces statistically. Mathematical modelof the system for the positioning apparatus was derived from the dynamic behaviors of structural parts.Since the conventional piezoelectric actuator generates the short stroke, a bridge-type flexural hingemechanism is introduced to amplify the linear motion range. Using the proposed smart structure,simulations under the representative positioning motion were conducted to demonstrate themicro-positioning under the stick-slip friction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.246.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Enhance of Tumor Targeting by Receptor-Mediated Endocytosis Using Low Molecular Water-Soluble Chitosan Nanoparticles Loaded with Anticancer Agent (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 469-472 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, we prepared using low molecular weight water-soluble chitosan nanoparticle loadedpaclitaxel (LMWSC-NPT) and investigated the potential as a drug carrier which is able to accumulate in thetumor site. In the experiment of receptor-mediated endocytosis, LMWSC-NPT was treated with sodium azid(NaN3) as an inhibitor of endocytosis process. As results, the antitumor activity of LMWSC-NPT treatedwith sodium azid didn’t show but LMWSC-NPT was shown the high antitumor activity. Therefore,LMWSC-NPs modified with hydrophobic group will be useful anticancer agent carrier via receptor-mediatedendocytosis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.469.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Precision Motion Control of a Smart Structure Using an Enhanced Stick-Slip Model (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 56 (Sept. 2008), p. 98-103 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: In this paper, a smart structure for the micro position control is proposed using the piezostack actuator. The smart structure is comprised with PZT based stack actuator, mechanicaldisplacement amplifier and positioning devices. Based on the bridge-type flexural hinge mechanism,a displacement amplifier is designed and integrated with a piezo stack actuator to produce a desirablepositioning stroke of the device. In order to achieve the high precision control performance in apositioning device, a stick-slip phenomenon should be suppressed in contacting surfaces of thedevice, which is generally indispensable in the mechanically connected systems and particularlyobvious for the micro-scale system. Therefore, the stick-slip model is enhanced by theoreticallycalculating the static friction based on the statistical rough surface contact model. Then, a PIDfeedback control algorithm with the developed stick-slip model is formulated for achieving accuratepositioning of the device. Using the proposed smart structure, simulations of precise position controlunder the representative operating condition of positioning are conducted to demonstrate thestick-slip suppressing and micro positioning performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.56.98.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Nanosized Iron Oxide with Different Morphology on Nanomechanical Properties of Nanocomposite Coating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2218-2220 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The nanocomposite coatings were prepared on the surface of PVC substrate using spinningtechnique with attempts of introducing nanosized iron oxide particles with different morphology into theorganic-inorganic hybrid matrices. The hybrid matrices were derived from 3-glycidoxypropyltrimethoxysilane(GLYMO) and tetraethoxysilane (TEOS) with a process of hydrolyzing and condensation.Nanosized iron oxide particles were synthesized by hydrolysis of FeCl3 solution at different pH value anddifferent temperature. The effects of different additions on nanomechanical properties of thenanocomposite coatings were investigated using X-ray powder diffraction (XRD), transmission electronmicroscopy (TEM) and MTS Nano Indenter XP system. It was found that the acicular α-FeOOH andspherical α-Fe2O3 particles were synthesized, both of them dispersed homogeneously. Nanoindentationand nanoscratch behaviors of the nanoindenter system showed that both of the nanocomposite coatingsreinforced the nanomechanical properties of the PVC obviously. Especially, the contribution of acicularα-FeOOH was more remarkable than the spherical α-Fe2O3
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2218.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis, electrical and optical properties of multifunctional poly[2-(2-ethyl-hexyloxy)-1,4-phenylenevinylene] (1995)
    Springer
    Polymer bulletin 35 (1995), S. 49-56 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Branched monoalkoxy-substituted poly[2-(2-ethylhexyloxy)-1,4-phenylenevinylene] (EH-PPV) was prepared in thin films via the water-soluble precursor technique and solution elimination method. These precursor polymer films could be stretched up to 8 times, and the drawn films of the EH-PPV could be doped with I2 and FeCl3 to give conductivities of 5.28x10-3 and 0.56 S/cm, respectively. The third-order nonlinear optical susceptibility of the polymer was determined by using third harmonic generation (THG) method at 1907 nm, fundamental wavelength. Measured χ(3)(−3ω; ω,ω,ω) value was 3.8x10-12 esu. The maximum emission wavelength of EH-PPV film in photoluminescence spectrum was 560 nm, corresponding to the yellowish red color.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312893
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  • 10
    Electronic Resource
    Electronic Resource
    Virtual sample generation using a population of networks (1997)
    Springer
    Neural processing letters 5 (1997), S. 21-27 
    Details
    ISSN: 1573-773X
    Keywords: committee network ; decision-directed ; generalization ; regression ; virtual sample
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Multilayer perceptrons have been shown to approximate any continuous functions with a desired precision. With insufficient training samples, however, the network can not learn the function properly and popular model selection methods such as cross validation can not be used. We propose a scheme to generate virtual samples using a population of networks. They are applied to regression problems and are shown to improve generalization and to solve the model selection problem at the same time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009653706403
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