scholarly journals Chemical Property Changes and Thermal Analysis during the Carbonizing Process of the Pollen Grains of Typha

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 128 ◽  
Author(s):  
Mingliang Gao ◽  
Beihua Bao ◽  
Yudan Cao ◽  
Mingqiu Shan ◽  
Fangfang Cheng ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Process Condition ◽  
Pollen Grains ◽  
Color Measurement ◽  
Infrared Spectrometry ◽  
Heating Process ◽  
Monitoring Methods ◽  
Processing Theory ◽  
Optimal Processing ◽  
Property Changes

Carbonized pollen grains of Typha (CPT) were widely used in clinical for antithrombosis, wound and bleeding in China. In order to ensure the role of drugs, it is very important to control the quality of drugs. However, there is a lack of monitoring methods in the process of charcoal preparation. To characterize the process of CPT, we used thermal analysis, scanning electron microscope (SEM), color measurement, Fourier transform infrared spectrometry (FTIR) and HPLC. In this study, 7 min was the optimal processing time and the heating process condition should be controlled under 272.35 ± 7.23 °C. This comprehensive strategy to depict the whole carbonizing process would provide new ideas for researches on quality control of Traditional Chinese Medicine (TCM) and processing theory of charcoal medicine.

Study of Thermal Reduction of Barium Sulphate for Barium Sulphide Preparation

2017 ◽  
Author(s):  
Magdalena Balintova ◽  
Stefan Demcak ◽  
Adriana Estokova ◽  
Marian Holub ◽  
Petra Pavlikova
Keyword(s):  
Thermal Analysis ◽  
Colorimetric Method ◽  
Barium Sulphate ◽  
Thermal Reduction ◽  
Infrared Spectrometry ◽  
Acidic Solutions ◽  
Biological Removal ◽  
Barium Compounds ◽  
Insoluble Product ◽  
Sulphate Removal

Industrial wastewaters, particularly those associated with mining and mineral processing, can contain high con-centrations of sulphate. There are various methods of sulphate removal e.g. reverse osmosis, ion exchange, precipitation by lime, cements, and salts of barium and the biological removal process. The soluble salts of barium are most commonly used for precipitation of sulphate from aquatic acidic solutions to the insoluble product barium sulphate BaSO4. Benefits of precip-itation are high sulphate removal efficiency but limitations are toxicity of barium compounds and high economical costs. For this reason the recycling of BaSO4 to barium sulphide BaS (the precipitating reagent) is very important. The paper deals with study of BaSO4 reduction by activated carbon to BaS by thermal analysis and infrared spectrometry. DCS analysis indicated that conversion of BaSO4 to BaS in the range of temperature 800–1,000 °C was performed. Thermal analysis and infrared spectra of the products confirmed the change in its composition, but process of reduction by carbon was incomplete and in sample was still present a part of BaSO4. Presence of BaS was confirmed by colorimetric method.

Automated Monitoring of Manufacturing Processes, Part 1: Monitoring Methods

1995 ◽  
Vol 117 (2) ◽  
pp. 121-132 ◽  
Author(s):  
R. Du ◽  
M. A. Elbestawi ◽  
S. M. Wu
Keyword(s):  
Spectral Analysis ◽  
System Modeling ◽  
Process Condition ◽  
Process Conditions ◽  
Manufacturing Processes ◽  
Monitoring Methods ◽  
Time Frequency ◽  
Automated Monitoring ◽  
Two Phases ◽  
Analysis System

This paper presents a systematic study of various monitoring methods suitable for automated monitoring of manufacturing processes. In general, monitoring is composed of two phases: learning and classification. In the learning phase, the key issue is to establish the relationship between monitoring indices (selected signature features) and the process conditions. Based on this relationship and the current sensor signals, the process condition is then estimated in the classification phase. The monitoring methods discussed in this paper include pattern recognition, fuzzy systems, decision trees, expert systems and neural networks. A brief review of signal processing techniques commonly used in monitoring, such as statistical analysis, spectral analysis, system modeling, bi-spectral analysis and time-frequency distribution, is also included.

Transient Thermal Analysis for Rapid Thermal Processing of GaAs

1988 ◽  
Vol 144 ◽  
Author(s):  
F. K. Yang ◽  
S. J. Pien ◽  
R. Kwor
Keyword(s):  
Thermal Analysis ◽  
Silicon Dioxide ◽  
Oxide Layer ◽  
Thermal Processing ◽  
Rapid Heating ◽  
Rapid Thermal Processing ◽  
Doping Effect ◽  
Heating Process ◽  
Light Sources ◽  
Transient Thermal

ABSTRACTA thermal analysis is performed to simulate the rapid heating process for ion implanted GaAs with consideration of the doping effect. The results are for cases with various concentrations and thicknesses of doping layer. Also studied are the heating processes for silicon dioxide capped GaAs. The effects of the thickness of the oxide layer are discussed. The magnitude of the temperature differences across the wafer is addressed. The present analysis considers xenon-arc lamps and tungsten-halogen lamps as the light sources.

Vibration, Sound and Thermal Analysis as a Condition Monitoring Methods for Electric Motors

2012 ◽  
Vol 239-240 ◽  
pp. 462-467 ◽  
Author(s):  
Maciej Orman ◽  
Cajetan Pinto
Keyword(s):  
Thermal Analysis ◽  
Condition Monitoring ◽  
Measurement Techniques ◽  
Reference Signal ◽  
Infrared Camera ◽  
Vibration Monitoring ◽  
Electric Motors ◽  
Monitoring Methods ◽  
Result Section ◽  
Thermal Measurements

This paper presents a comparison of different measurement techniques for condition monitoring of electric motors. Results are presented for vibration, acoustic and thermal analysis. Vibration signals were measured by piezoelectric accelerometers, acoustic by microphones and temperature data was collected by an infrared camera. Two induction motor cases were examined – healthy motor case and combination of static eccentricity with soft foot case. Vibration monitoring is a well known technique used in condition monitoring and in this work vibration measurements were used as a reference signal for assessment of the value of acoustic and thermal measurements. As presented in result section both acoustic analyses as well as thermal images appear as valuable techniques for condition monitoring of electric motors. All the measurements where conducted in an industrial environment.

scholarly journals Optimization of the Heating Phase for the Bi-frequency Heat Treat Process of a Gear

2019 ◽  
Author(s):  
Mohammad Elamin ◽  
Patrick Lombard ◽  
Alejandro Rodriguez ◽  
Philippe Wendling
Keyword(s):  
Thermal Analysis ◽  
Temperature Distribution ◽  
Uniform Distribution ◽  
3D Model ◽  
Gear Wheel ◽  
Optimization Process ◽  
Heating Process ◽  
Heat Process ◽  
Treated Area ◽  
Heating Phase

Abstract In this contribution, we attempt to optimize the heat process of a gear. The goal is to evaluate the best use of two frequencies to complete the heating phase in the least amount of time achieving a uniform distribution of temperature in the treated area of the gear. Assuming the application of the appropriate cooling, this temperature distribution will lead to the appropriate hardness along and between the teeth of the gear. A 3D model of part of the gear wheel is modelled in a multiphysics magneto-thermal analysis. The two frequencies used for the heating are first evaluated. In the optimization process, the duration of the application for each frequency is a parameter. Temperatures are evaluated through the heating process at selected locations as constraints of the optimization process.

Application of Different Fourier Transform Infrared (FT-IR) Methods in the Characterization of Lime-Based Mortars with Oxblood

2018 ◽  
Vol 73 (5) ◽  
pp. 479-491 ◽  
Author(s):  
Kun Zhang ◽  
Cristina Corti ◽  
Alberto Grimoldi ◽  
Laura Rampazzi ◽  
Antonio Sansonetti
Keyword(s):  
Thermal Analysis ◽  
Contact Angle ◽  
Fourier Transform ◽  
Early Stage ◽  
Fourier Transform Infrared ◽  
Attenuated Total Reflection ◽  
Static Contact Angle ◽  
Color Measurement ◽  
Static Contact ◽  
Ft Ir

Organic compounds have frequently been added into lime mortars for property modifications, in order to satisfy various functional needs in building techniques. This study applies Fourier transform infrared (FT-IR) spectroscopy in transmission, reflection, and attenuated total reflection (ATR) modes to characterize lime-based mortar specimens containing oxblood, which has been used as additive as a common practice of long history in many parts of the world. The specimens were prepared basing upon a 19th-century Italian historic recipe, with the intention to have a better understanding on the possible characteristics of such mortars. Thermal analysis, color measurement, and static contact angle test were also used. After curing, the specimens show a distinctive dark-red color on the top surface, which is different from the bulk. Color measurements on the surface suggest that this color was formed at an early stage and was able to maintain stable for a relatively long period of time. Both transmission and reflection FT-IR confirm the preferential accumulation of proteins on the top surface, which should have induced their water repellency according to the static contact angle test. In addition, specimens show weaker calcite bands in FT-IR transmission, reflection, as well as ATR spectra; the pattern of ATR spectra after the thermal analysis to 500 °C suggests the formation of amorphous calcium carbonate, which is related to the presence of oxblood.

The New Optimization Approach to Improve SNR in Periodic Signal Input/Output System

2013 ◽  
Vol 433-435 ◽  
pp. 445-449
Author(s):  
Gen Jian Yu ◽  
Kun Peng Weng
Keyword(s):  
Periodic Signal ◽  
Optimization Approach ◽  
Input Output ◽  
Nonlinear Signal Processing ◽  
Optimal Output ◽  
Processing Theory ◽  
Optimal Processing ◽  
Signal Input ◽  
Output System ◽  
Nonlinear Signal

This paper presents a local optimal processing approach that can use in the periodic signal input/ output noise enhancement phenomenon. A novel kind of locally optimization approach is established by background noise that generated from Gauss noise and bifurcation noise. It is demonstrated that the approach has its optimal output-input SNR gain at nonzero noise intensity. The papers conclusions bring the bright application future for the nonlinear signal processing theory.

Modification of Heat Flow Parameters during the Ceramic Assisted Microwave Heating of HDPE

2014 ◽  
Vol 1036 ◽  
pp. 240-245
Author(s):  
Ionel Danut Savu
Keyword(s):  
Thermal Analysis ◽  
Microwave Heating ◽  
Ceramic Powder ◽  
Base Material ◽  
Crystallization Rate ◽  
Relaxation Modulus ◽  
Industrial Applications ◽  
Heating Process ◽  
Microwave Technology ◽  
The Impact

Microwave technology is more often used in large number of application. Heating polymers by microwave technology is met from domestic o industrial applications and the influences brought by the heating source, the impact between the microwaves and the polymer, to the base material is necessary to be well known to avoid different types of failure of the pieces. HDPE is polymer often used in application with interaction between material and microwaves. Because of that the analysis of the influence of such interaction on the flowing characteristics of the HDPE is proposed in this paper. Experimental programme was applied to HDPE 100 and HDPE 80, both heated by using mono-directional microwave beam with different sets of parameters (factorial experiment principles were used to establish the heating parameters). Plasticity characteristics of the heated material, as elongation and relaxation modulus, were determined by using thermal analysis. It has been recorded important influences of the heating process on the surface in contact with the ceramic powder that was used as microwave absorber. The DSC analysis revealed a decreasing of the elongation with about 16% and decreasing of the relaxation modulus with amount up to 18%, for the material located at the interface between the polymer and the ceramic powder. Each 2 mm from the interface to the interior of the polymer brought an intensity of the modification up to 15% of the values recorded for the interface. After 6 mm from the interface the intensity of the modification decreases very fast. By using DSC thermal analysis it has been analysed the crystallization rate of the polymer modified by the microwave heating and high rates were recorded. About 12% difference between the relaxation modulus of the heated and non-heated HDPE and that means local ageing transformation of the HDPE.

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