scholarly journals Switching Tube-Based MPC: Characterization of Minimum Dwell-Time for Feasible and Robustly Stable Switching

2019 ◽  
Vol 64 (10) ◽  
pp. 4345-4352
Author(s):  
Bernardo Andres Hernandez Vicente ◽  
Paul Anthony Trodden
Keyword(s):  
Dwell Time

Synthesis, Phase Formation and Characterization of Co4Nb2O9 Powders Synthesized by Solid-State Reaction

2008 ◽  
Vol 55-57 ◽  
pp. 873-876 ◽  
Author(s):  
N. Chaiyo ◽  
R. Muanghlua ◽  
A. Ruangphanit ◽  
Wanwilai C. Vittayakorn ◽  
Naratip Vittayakorn
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Solid State Reaction ◽  
Dwell Time ◽  
Single Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Techniques ◽  
Scanning Electron

A corundum-type structure of cobalt niobate (Co4Nb2O9) has been synthesized by a solid-state reaction. The formation of the Co4Nb2O9 phase in the calcined powders was investigated as a function of calcination conditions by differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. Morphology and particle size have been determined by scanning electron microscopy (SEM). It was found that the minor phases of unreacted Co3O4 tend to form together with the columbite CoNb2O6 phase at a low calcination temperature and short dwell time. It seems that the single-phase of Co4Nb2O9 in a corundum phase can be obtained successfully at the calcination conditions of 900°C for 60 min, with heating/cooling rates of 20°C /min.

scholarly journals Characterization of Impurities in Acarbose Hydrate by using LCMS/MS and NMR

2020 ◽  
Vol 11 (4) ◽  
pp. 8124-8129
Author(s):  
Maruthi R ◽  
Chandan R S ◽  
Anand Kumar Tengli
Keyword(s):  
Dwell Time ◽  
Hplc Method ◽  
Type Ii ◽  
Reverse Phase ◽  
Type Analysis ◽  
Diabetes Mellitus Type Ii ◽  
Injection Volume ◽  
Rp Hplc ◽  
Bulk Drug

An accurate and lively LC-MS/MS and NMR analytical methods have been developed for the recognition and characterization of key impurities in Acarbose. Acarbose is a diabetic medication used to treat Diabetes mellitus Type II and prediabetes in certain countries. Three unknown impurities were detected in Acarbose hydrate bulk drug substance using RP-HPLC method at RT 17.65 min, 18.4 min and 25.85 min. Such impurities have been separated by HPLC and are further characterized by the use of techniques LC-MS / MS and NMR. The C18 reverse phase column and Methanol and Ammonium Type analysis (80:20) have been conducted for the purpose of analysis. With an injection volume of 10 μL, the flow rate was maintained at 0,5mL / min. With binary gradient program, the separations were achieved and the column was kept at ambient temperature. The MS conditions adopted for this analysis with a scan range of m/z = 50 to 500 with a dwell time of 3 seconds. NMR was carried out using DMSO as solvent. Based on spectral data, the impurities have been characterized as IMP B, IMP D and IMP E.

Preparation and Characterization of Amorphous Al-Based Metal Foams

2015 ◽  
Vol 816 ◽  
pp. 682-687
Author(s):  
Cong Bo Li ◽  
Wei Wei Chen ◽  
Lu Wang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Intermetallic Compounds ◽  
Dwell Time ◽  
Metal Foam ◽  
Metal Foams ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Xrd Patterns

Amorphous Al-Cu-Ti metal foams with the porosity of 65% were prepared by spark plasma sintering with both the diameter and height of 10 mm. The SPS process was carried out under the pressure, the dwell time and the temperatures of 300 MPa, 5min and 623-673K, respectively. The microstructure and mechanical behavior of the amorphous Al-Cu-Ti metal foams were investigated. The results showed that sintering at high temperatures improved the crystallinity and adhesion between particles. The intermetallic compounds, i.e. Al-Ti, Al-Cu and Al-Cu-Ti were identified from the XRD patterns. It was found that weak adhesion and irregular shape of NaCl might reduce the mechanical properties. The highest strength of amorphous Al-based metal foam sintered at 653K, 300MPa was 7.97MPa.

scholarly journals Microstructure Characterization of Composite from ZrO2 – Ti System

2017 ◽  
Vol 62 (4) ◽  
pp. 2045-2049 ◽  
Author(s):  
P. Łada ◽  
A. Miazga ◽  
P. Bazarnik ◽  
K. Konopka
Keyword(s):  
Quantitative Analysis ◽  
Dwell Time ◽  
Titanium Powder ◽  
Slip Casting ◽  
Inert Atmosphere ◽  
Sintering Process ◽  
Titanium Particle ◽  
Casting Method ◽  
Composite Samples

AbstractIn this work the microstructure analysis of composite from ZrO2– Ti system were presented. For the preparation of the composite samples nanometric ZrO2powder stabilized by 3 mol% of Y2O3and micrometric titanium powder were used. The composites with 10 vol.% addition of titanium particles were prepared by slip casting method. The sintering process was conducted at 1450°C with 2 hours’ dwell time, in the inert atmosphere of argon. The microstructure observations were carried out with the use of SEM and STEM microscopes. The quantitative analysis and stereological characterization were performed. The SEM and STEM observations allowed characterizing the microstructure of composite samples. Especially, the interface between titanium particles and zirconia matrix was described. The growth of the zirconia grains around the Ti rich areas was observed. The increase of the zirconia grains size results from the reaction on the interface between titanium particle and zirconia matrix during the sintering process.

Dwell time characterization of DNA translocation through ITO-SiNx nanopores

2021 ◽  
Author(s):  
Xiaojie Li ◽  
Xin Zhu ◽  
Chaoming Gu ◽  
Zhen Cao ◽  
Zhi Ye ◽  
...  
Keyword(s):  
Dwell Time ◽  
Dna Translocation

scholarly journals Ribosome fingerprinting with a solid-state nanopore

2020 ◽  
Author(s):  
Mukhil Raveendran ◽  
Anna Rose Leach ◽  
Tayah Hopes ◽  
Julie L. Aspden ◽  
Paolo Actis
Keyword(s):  
Solid State ◽  
Dwell Time ◽  
Cultured Cells ◽  
Neuronal Cell ◽  
Analytical Tool ◽  
Biological Molecules ◽  
Peak Amplitude ◽  
Human Neuronal Cell ◽  
Mixed Samples

AbstractNanopores hold great potential for the analysis of complex biological molecules at the single entity level. One particularly interesting macromolecular machine is the ribosome, responsible for translating mRNA into proteins. In this study, we use a solid-state nanopore to fingerprint 80S ribosomes and polysomes from a human neuronal cell line and, Drosophila melanogaster cultured cells and ovaries. Specifically, we show that the peak amplitude and dwell time characteristics of 80S ribosomes are distinct from polysomes and can be used to discriminate ribosomes from polysomes in mixed samples. Moreover, we are able to distinguish large polysomes, containing more than 7 ribosomes, from those containing 2-3 ribosomes, and demonstrate a correlation between polysome size and peak amplitude. This study highlights the application of solid-state nanopores as a rapid analytical tool for the detection and characterization of ribosomal complexes.

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