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排序方式: 共有71条查询结果,搜索用时 31 毫秒
11.
Measuring tablet porosity using multispectral imaging system 总被引:1,自引:0,他引:1
Ervin Nippolainen Tuomas Ervasti Jarkko Ketolainen Alexei A. Kamshilin 《Optical Review》2010,17(3):323-326
A multispectral imaging system with computer controlled light source of 16 light emitting diodes is applied for measuring
of tablet porosity. The system is based on a subspace vector model of surface reflection. The measured spectral data are compressed
on the stage of measurement and used directly for the discrimination of tablets with different porosity. The experimental
results demonstrate that the multispectral imaging system is a potential method for tablet porosity measurement. 相似文献
12.
Bawuah Prince Zeitler J. Axel Ketolainen Jarkko Peiponen Kai-Erik 《Optical Review》2018,25(3):444-449
Optical Review - Terahertz (THz) spectra from the pure forms [i.e. the active pharmaceutical ingredients (APIs)] of four commonly used antimalarial drugs are reported. The well-defined spectral... 相似文献
13.
14.
Hanna Kumpulainen Raimo Saari Jarkko Rautio Jouko Vepsäläinen 《Tetrahedron letters》2006,47(12):2003-2004
An efficient microwave-assisted synthesis of 1-chloroethyl phosphates was developed. Protected vinyl chlorophosphates undergo a fast conversion to the chloroethylidene phosphates in the presence of HCl with excellent yields up to 900 times faster than at the standard NTP conditions. 相似文献
15.
Kuzma M Jegorov A Hesso A Tornaeus J Sedmera P Havlícek V 《Journal of mass spectrometry : JMS》2002,37(3):292-298
The product ion mass spectra (collisionally induced dissociation mass spectra) of 12 different cyclosporins modified at every N-methylated amino acid residue with respect to cyclosporin A were compared and the effect of N-demethylation on ring opening mechanisms was evaluated. The four preferential protonation sites were identified in [MeBmt(1)]-cyclosporins. Three sites represented the N-methylated nitrogens of Sar(3), MeLeu(6) and MeLeu(9), while the remaining one represented the lactone group formed by the intramolecular N,O-acyl shift. Selective N-demethylation resulted either in the deletion of the entire fragment ion series or its substantial attenuation. The structures of three new natural cyclosporins in the study were supported by NMR data. 相似文献
16.
Jarkko Ihanus Eric Lambers Paul H. Holloway Mikko Ritala Markku Leskel 《Journal of Crystal Growth》2004,260(3-4):440-446
SrS1−xSex and ZnS1−xSex thin films were deposited by the atomic layer deposition (ALD) technique using elemental selenium as the Se source, thus avoiding use of H2Se or organometallic selenium compounds. X-ray diffraction (XRD) analysis showed that the films were solid solutions and X-ray photoelectron spectroscopy (XPS) data showed that the surface of both ZnS1−xSex and SrS1−xSex were covered with an oxide and carbon-containing contaminants from exposure to air. The oxidation of SrS1−xSex extended into the film and peak shifts from sulfate were found on the surface. Luminance measurements showed that emission intensity of the ZnS1−xSex:Mn alternating current thin film electroluminescent (ACTFEL) devices at fixed voltage was almost the same as that of the ZnS:Mn device, while emission intensity of the SrS1−xSex:Ce devices decreased markedly as compared to the SrS:Ce device. Emission colors of the devices were altered only slightly due to selenium addition. 相似文献
17.
Yingfeng Shen Hannes Orelma Asko Sneck Kirsi Kataja Juha Salmela Pia Qvintus Anna Suurnäkki Ali Harlin 《Cellulose (London, England)》2016,23(6):3393-3398
A new process for preparing thin cellulose nanofibril (CNF) filaments (thickness of 16 µm) was investigated by utilizing the dry spinning approach. In the process, CNF hydrogel was extruded through a fine nozzle onto an adhesion controlled capstan (drum) with low friction (slippery surface) at a speed of up to 11 m/s. The utilized capstan enables excellent line speed control when the slippery surface is applied, and prevents drying shrinkage of the spun filaments. The mechanical properties of prepared filaments can be optimized with the stretch ratio, the ratio of the speed of the drum surface, and the CNF jet flow. The developed method allows for manufacturing thin CNF filaments with an elevated spinning rate in a more controlled manner. 相似文献
18.
Jarkko Puustinen Jyrki Lappalainen Jussi Hiltunen Marianne Hiltunen 《Applied Physics A: Materials Science & Processing》2014,116(1):379-387
Optical scattering properties of nanostructured matter have crucial impact on performance efficiency of various photonic components, such as waveguides, display elements, and solar cells. In this paper, diffuse transmission properties of nanocrystalline Pb(Zr x Ti1?x )O3 thin films with a high refractive index of ~2.5 and optical transmittance are presented. Thin films with a thicknesses ranging from 50 to 500 nm were studied using integrating sphere technique and results were compared to simulations performed by a scalar scattering theory. Thin films were deposited by pulsed laser deposition at room temperature on MgO(100) substrates and post-annealed at a temperature of 800 °C. Structural phase evolution-induced surface effects, which introduced periodicity on the film surface, cause the definite diffuse elements in transmission spectra of the films. Low and evenly distributed scattering amplitudes in k-space were seen for highly tetragonal- or trigonal-oriented films with non-textured surfaces, which led to low diffuse transmission values (T D ≈ 5 %), while confined and increased scattering amplitudes in k-space were seen for tetragonal–trigonal-oriented films, with phase co-existence, which led to microstructure-induced textured surfaces and increased diffuse transmission values (T D ≈ 50 %). For highly textured surfaces, scattering amplitudes distributed in tilted ellipsoid shape in k-space was observed. Difference between modeled and measured values was 3.8 % in maximum. 相似文献
19.
Koivunen JT Nissinen L Käpylä J Jokinen J Pihlavisto M Marjamäki A Heino J Huuskonen J Pentikäinen OT 《Journal of the American Chemical Society》2011,133(37):14558-14561
Collagen binding integrins are an important family of cell surface receptors that mediate bidirectionally signals between the interior of the cell and the extracellular matrix. The protein-protein interactions between cells and collagen are necessary for many physiological functions, but also promote diseases. For example, the interaction of α2β1 integrin and collagen has been shown to have an important role in thrombus formation and cancer spread. The fact that the discovery of small molecules that can block such protein-protein interactions is highly challenging has significantly hindered the discovery of pharmaceutical agents to treat these diseases. Here, we present a rationally designed novel fluorescent molecule that can be synthesized in just a few minutes from commercially available starting materials. This molecule blocks the protein-protein interaction between α2β1 integrin and collagen, and due to its fluorescent properties, it can be employed in wide variety of biological applications. 相似文献
20.
On Tailoring of Nonlinear Spectral Properties of Nanocomposites Having Maxwell Garnett or Bruggeman Structure 总被引:2,自引:0,他引:2
Nonlinear spectral properties of two different types of conjugated polymers (polythiophene PT10 and polysilane PDHS) with nanoscale TiO2 particles forming a Maxwell Garnett or a Bruggeman composite are studied. According to the present simulations, it is possible both to enhance and to tailor the magnitude and the spectral properties, respectively, of the effective degenerate third-order nonlinear susceptibility of the composite. This is done simply by tuning the volume fraction of TiO2 inclusions and by changing the topology of the composite. 相似文献