วารสารวิชาการเทคโนโลยีอุตสาหกรรม (J. Ind. Tech.) อยู่ในฐานข้อมูล TCI กลุ่ม 2 (2563) มีค่า JIF = 0.094 | The Journal of Industrial Technology (J. Ind. Tech.) is indexed in TCI Tier 2 (2020) with impact factor, JTIF 0.094

Articles

Biocementation through Microbial Calcium Carbonate Precipitation

Civil Engineering

Biocementation through microbial carbonate precipitation is a new branch of microbial geotechnology that deals with the applications of microbiological methods to produce cemented materials used in engineering. The primary consideration of these applications is to improve the geophysical properties of soil so that it will be suitable for construction and environmental purposes. The applications of biocementation would require an interdisciplinary research at the confluence of microbiology, ecology, geochemistry, civil and environmental engineering. This new field has the potential to meet society s expanding needs for innovative treatment processes that improve soil engineering properties. This paper presents an overview of biocementation, particularly through microbial calcium carbonate (CaCO3) precipitation, and non-destructive geophysical techniques for real-time monitoring of soil engineering properties. Focus is then narrowed to an example of laboratory-scale test of biocementation of sandy soil and measurement of strength development by shear wave velocity (Vs). Other analytical results included microscopic imaging by scanning electron microscope (SEM) and identification of CaCO3 precipitation presented in biocemented sand by X-ray diffactometer (XRD) were discussed. Potential advantages and envisioned applications of biocemented soil improvement are identified.

Implement of Harmonic Current Impact on Power Factor Correction Device

Electrical and Electronics Engineering

This paper presents harmonic disturbance impact on power factor improvement in power system. The Contents of this paper contains harmonic signification, harmonic current sources in power system, harmonic definitions and effect of power factor improvement by connected capacitors into power system with harmonic disturbance. Power factor improvement in power system with harmonic disturbance is caused of parallel resonance generation in power system as a result of matching impedance of inductive reactance of a power transformer and capacitive reactance of a capacitor at harmonic frequency. Parallel resonance phenomenon incurs harmonic voltage and current amplification. Harmonic voltage and current will dominate on capacitors in the power factor correction device and link to failure and damage on capacitors in the power factor correction equipment. Any problems of parallel resonance impact can be avoided and corrected by connecting series reactors to capacitors in the power factor correction device. Series reactors will move a point of parallel resonance from significant harmonic order to non-significant harmonic order and partial reducing harmonic current in power system. However, if power system contains a lot of harmonic current quantity the filter of harmonic current shall be installed in power system for reduce harmonic current in power system.

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