scholarly journals FORMATION PROCESS AND CHARACTERIZATION OF SPHERE-LIKE BACTERIAL CELLULOSES IN AGITATED CULTURE IN TWO DIFFERENT MEDIA

2020 ◽  
Vol 54 (7-8) ◽  
pp. 713-723
Author(s):  
JICAI BI ◽  
◽  
SIXIN LIU ◽  
CONGFA LI ◽  
◽  
...  
Keyword(s):  
Formation Process ◽  
Agitated Culture

Characterization of Tissue Microstructure Scatterer Distribution with Spectral Correlation

1993 ◽  
Vol 15 (3) ◽  
pp. 238-254 ◽  
Author(s):  
Tomy Varghese ◽  
Kevin D. Donohue
Keyword(s):  
Formation Process ◽  
Biological Tissue ◽  
Statistical Parameters ◽  
Spectral Correlation ◽  
Tissue Microstructure ◽  
Power Spectral ◽  
Spectral Peaks ◽  
Ultrasound Signal

Characterization of tissue microstructure from the backscattered ultrasound signal using the spectral autocorrelation (SAC) function provides information about the scatterer distribution in biological tissue. This paper demonstrates SAC capabilities in characterizing periodicities in A-scans due to regularity in the scatterer distribution. The A-scan is modelled as a cyclostationary signal, where the statistical parameters of the signal vary in time with single or multiple periodicities. This periodicity manifests itself as spectral peaks both in the power spectral density (PSD) and in the SAC. Periodicity in the PSD will produce a well defined dominant peak in the cepstrum, which has been used to determine the scatterer spacing. The relationship between the scatterer spacing and the spacing of the spectral peaks is established using a stochastic model of the echo-formation process from biological tissue. The distribution of the scatterers within the microstructure is modelled using a Gamma function, which offers a flexible method of simulating parametric regularity in the scatterer spacing. Simulations of the tissue microstructure for lower orders of regularity indicate that the SAC components reveal information about the scatterer spacing that are not seen in the PSD and the cepstrum. The echo-formation process is tested by simulating microstructure of varying regularity and analyzing their effect on the SAC, PSD and cepstrum. Experimental validation of the simulation results are provided using in vivo scans of the breast and liver tissue that show the presence of significant spectral correlation components in the SAC.

scholarly journals Colloidal lead iodide nanorings

Nanoscale ◽  
2018 ◽  
Vol 10 (45) ◽  
pp. 21197-21208 ◽  
Author(s):  
Eugen Klein ◽  
Leonard Heymann ◽  
Ana B. Hungria ◽  
Rostyslav Lesyuk ◽  
Christian Klinke
Keyword(s):  
Formation Process ◽  
Optical Measurements ◽  
Synthesis And Characterization ◽  
Lead Iodide ◽  
Ring Structures ◽  
Colloidal Lead ◽  
20 Nm

We present the synthesis and characterization of PbI2 nanorings prepared via a direct colloidal route. The ring structures are obtained by etching as prepared PbI2 nanosheets with trioctylphosphine and possess thicknesses between 20 nm and 85 nm and lateral dimensions of up to 10 μm. The formation process was analyzed and discussed as well as the electrical and optical measurements.

Electrical and Wafer Surface Profile Characterization of NiSi Formation Process using a Four Point Probe and Optical Surface Profilometer

2019 ◽  
Vol 19 (1) ◽  
pp. 315-322 ◽  
Author(s):  
Woo Sik Yoo ◽  
Takeshi Ueda ◽  
Toshikazu Ishigaki ◽  
Kitaek Kang
Keyword(s):  
Formation Process ◽  
Surface Profile ◽  
Wafer Surface ◽  
Optical Surface

scholarly journals Preparation and characterization of a TiO2-NT/SnO2–Sb tubular porous electrode with long service lifetime for wastewater treatment process

RSC Advances ◽  
2017 ◽  
Vol 7 (60) ◽  
pp. 37806-37814 ◽  
Author(s):  
Anlin Xu ◽  
Xiang Dai ◽  
Kajia Wei ◽  
Weiqing Han ◽  
Jiansheng Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Formation Process ◽  
Treatment Process ◽  
Porous Electrode ◽  
Wastewater Treatment Process ◽  
Service Lifetime

We have studied the formation process of a novel TiO2-NTs/SnO2–Sb tubular porous electrode with a long service lifetime for the wastewater treatment process.

Preparation and Characterization of (HAp/SiO2)/Ti Biocomposites

2011 ◽  
Vol 217-218 ◽  
pp. 88-92 ◽  
Author(s):  
Xue Zhang ◽  
Zhi Meng Xiu ◽  
Xiao Wu Li
Keyword(s):  
Powder Metallurgy ◽  
Formation Process ◽  
Immersion Time ◽  
Apatite Layer ◽  
Apatite Crystal ◽  
Powder Metallurgy Method ◽  
In Vitro Bioactivity ◽  
Sbf Solution

(HAp/SiO2)/Ti biocomposites were prepared by the powder metallurgy method. The phase compositions and the in vitro bioactivity of such biocomposites were systematically characterized. The XRD result shows that the phase compositions of (HAp/SiO2)/Ti composites are mainly composed of Ca4O(PO4)2 (TTCP), Ti, TiO2 and CaO. The synthesized (HAp/SiO2)/Ti biocomposites exhibit a good bioactivity, for example, after the samples are immersed in SBF solution only for 24 hours, the bone-like layer consisting of spherical apatite crystal clusters has deposited on the surface of the samples. The density and thickness of the apatite layer increases with increasing immersion time. The formation process and mechanisms of bone-like apatite layer are also discussed.

Sign in / Sign up

Export Citation Format

Share Document