Electrical Engineer

Tanya Gachovska

Electrical Engineer, BA, M. Eng, Ph.D

**** **** ***. *** *** • Lincoln • 68503 •Tel: 402-***-**** • 402-***-**** •**********@*****.***

Objective

Seeking a position in Power electronics – design, modeling, simulation and validation of power semiconductor devices, and also interested in their application in power electronic circuits. Ready to learn, to contribute and to enjoy new challenges.

Work History

2008 – Present: Teacher and Research Assistant

Lecture – Electrical circuits II (MOSFET and BJT ) University of Nebraska - Lincoln, USA

2006 – 2008: Postdoctoral Research Scientist University of Nebraska - Lincoln, USA

2004 – 2006: Postdoctoral Research Associate

Faculty Lecturer - Fundamentals of Physics McGill University, Montreal, Quebec, Canada

1997 – 2003: Assistant Professor and Research Scientist University of Ruse, Ruse, Bulgaria

1993 – 1996: Quality Supervisor of Electrical Equipment Ruse Shipyard – LTD, Bulgaria

1991 – 1997: Instructor (part time) University of Ruse, Bulgaria

Education

2008 – 2012: PhD in Electrical Engineering - Modeling of Power Semiconductor Devices (GPA:3.91/4) University of Nebraska- Lincoln, USA

1999 – 2003: PhD in Electrical Engineering- Pulsed Electric Field Equipment for Tobacco Leaves University of Ruse, Ruse, Bulgaria

1991 – 1992: Teaching Certificate University of Ruse, Ruse, Bulgaria

1985 – 1991: Master of Engineering - Engineering Ergonomics and Industrial Design University of Ruse, Ruse, Bulgaria

1985 – 1990: Master of Engineering - Automation and Electronics Engineer (GPA:5.35/6) University of Ruse, Ruse, Bulgaria

Projects, Research & Development

• Modeling and simulation of power GTO and NPT IJBT, 2011-2012

Modeling, simulation and analysing of the simulation results and writing a report.

• Comparison of the voltage drops of high power SiC and heterojunction Si/SiC transistors during the on steady-state conditions, 2010 - 2011

Design, modeling (using Matlab-Simulink, Maple) and simulation of the two structures, analysing the simulation results and writing a report and an article.

• Modeling and simulation of power Si, GaN and SiC diodes, 2010 - 2011

Development of method for calculation of the n-base depletion layer width Wmax for a given breakdown voltage VBD of a p+n–n+ structure. Modeling and simulation of the diodes, analysing the simulation results and writing an article.

• Modeling, simulation and validation of a power SiC BJT, 2009 - 2011

Modeling, simulation and testing of power SiC BJTs;

Analysing of the simulation and test results, validating the model, writing an article and presenting the results on IEEE conference.

• Investigation on the aging effect of supercapacitors, 2010 - 2011

Analysing the test results and helping with writing an article.

• Wind for irrigation applications, 2009

Analysing the simulation results and writing a part of an article.

• Design of different treatment chambers for PEF treatment and PEF systems: for liquids (microbial inactivation) solid materials (to accelerate drying processes; to improve the texture for cutting; and to enhance anthocyanins extraction) 2006 - 2008;

Managing the lab and supervising undergraduate and graduate students: design of PEF systems and treatment chambers; plan and conducting of experiments; statistical analysis of the data (using SAS); writing of reports an articles; presenting the results on different conferences.

• Designed and investigated a continuous ultrasound treatment chamber for pasteurization, 2008.

Design of the chamber; plan and conducting of experiments; statistical analysis of the data; writing of report an article; presenting the results.

• Designed and investigated a continuous UV treatment chamber for pasteurization, 2007.

• Design; plan and conducting of experiments; statistical analysis of the data; writing of report and an article; presenting the results.

• Designed, fabricated and performed investigations with two high-voltage pulse generators used for food processing, 2005 - 2007

• Designed and fabricated two different pieces of electrical equipment used for the treatment of tobacco leaves to accelerate the drying process, 1999 - 2003

Publications

• Parigi, F., Gao, Y., Casares, M, Gachovska, T.K., Zhou, Y. S., Lu, Y. E., Patterson, D, Hudgins, J. 2011. Investigation on the Аging Еffect of Supercapacitors. MRS – Spring meeting 2011. Section M9.29.

• Gachovska, T.K., Hudgins, A., Bryant, A., Santi, E., Mantooth, H.A.., Agarwal, A. 2011. " Modeling, Simulation and Validation of a Power SiC BJT," IEEE Transactions on Power Electronics - Manuscript ID TPEL-Reg-201*-**-****.

• Gachovska, T.K., Du, B., Hudgins, J.L., Grekov, A., Bryant, A., Santi, E., Mantooth, H.A.., Agarwal, A. 2009. "Modeling and simulation of a SiC BJT," Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE , vol., no., pp.979-985.

• Parigi, F., Gachovska, T.K., Hudgins, J., Patterson, D. 2009. "Wind for irrigation application," Power Electronics and Machines in Wind Applications, 2009. PEMWA 2009. IEEE , vol., no., pp.1-4,

• Gachovska T K, Simpson M V, Ngadi M O, Raghavan GSV . 2009. Pulsed electric field treatment of carrots before drying and rehydration. J Sci Food Agric 89-14-237*-****(5)

• Gachovska T K, Adedeji A A, Ngadi M O, Raghavan V. 2008. Drying Characteristics of Pulsed Electric Field-Treated Carrot Drying Technology 26(10): 1244-1250.

• Adedeji A A, Gachovska, Ngadi M O, Raghavan V. 2008. Effect of Pretreatments on Drying Characteristics of Okra Drying Technology 26(10 ): 1251-1256.

• Gachovska T K, Adedeji A A,Ngadi M O. 2009. Influence of pulsed electric field energy on the damage degree in alfalfa tissue, Journal of Food Engineering 95 (4) 558-563

• Gachovska T, Kumar S, Thippareddi J, Williams F. 2008 Ultraviolet and pulsed electric field treatments have additive effect on inactivation of E. coli in apple juice. Journal of Food Science, submitted.

• Gachovska T, Adedeji A, Ngadi M, Raghavan G. 2007. Drying characteristics of pulsed electric field treated carrot. Drying Technology, accepted..

• Adedeji A, Gachovska T , Ngadi M, Raghavan G. 2007. Effect of Pretreatments on Drying Characteristics of Okra. Drying Technology - DRT accepted

• Gachovska T., Ngadi M., Subbiah J. 2007. Influence of energy on the damage degree in alfalfa tissue. ASABE Meeting Presentation, Paper Number: 076010.

• Xiang B, Ngadi M., Gachovska T., Simpson B. 2007. Pulse electric field treatment effects on rheological properties and color of soy milk. ASABE Meeting Presentation, Paper Number: 076007.

• Gachovska T., Ngadi M., Raghavan V. 2006. Pulsed electric field assisted juice extraction from alfalfa. Canadian Biosystems engineering. 48(3), 33-37.

• Xiang B.Y., Ngadi M.O., Ismail, A.A., Gachovska T. 2005. Effect of pulsed electric field and temperature on the secondary structure changes of β-lactoglobulin by using FTIR spectroscopy CSAE June 25-29, Winnipeg Paper No. 05-087.

• Gachovska, T. 2001. Electrical Spark Equipment with Regulated Voltage of Treatment and Results of Investigation it. Scientist Conference EEA’2001, vol.38(3), Rouse, 54-59

• Armyanov, N., Gachovska, T., Stoyanova T., Nedyalkov, N. 2001. An Investigation of Longitudial Electrical Spark Treatment of Tobacco Leaves Brand “Burley”. Agricultural Enginering, Sofia vol.2, 39-45.

• Armyanov, N., Gachovska, T., Gachovski, G., Stoyanova, T., Dimitrova St., Nedyalkov, N. 2001. Electrical spark equipment for treatment of tobacco leaves with energy doses supply. Agricultural Engineering, Sofia vol. 6, 16 - 22.

• Armyanov, N., Gachovska, T., Stoyanova, T., Kirryakov, D., 2001. Electrical spark equipment for treatment of tobacco leaves. Scientific Conference “Technologies, Security and Ecology’2001” V.Tarnovo –21-22 July 2001.

• Armyanov, N., Stefanova, S., Gachovska, T., Dimitrova, St., 2000. An investigation of electric spark equipment for treatment of tobacco leaves with constant voltage of treatment Scientific Conference NK’2000 VVYAPVO “P. Volov”.

• Armyanov, N., Stefanova, S., Stoyanova, T., S; Gachovska, T., Dimitrova, St. 1999. A possibility of raising the effectiveness of tobacco leaves electric spark processing. News of scientists union in Rouse, p.62-65.

• Armyanov, N., Stefanova, Stoyanova, T., Gachovska T. 1999. An electrical circuit parameters calculation of the electric spark machinery for tobacco leaves processing. Electrotechnic and Electronics, Sofia, 1-2 , 45- 49.

• Armyanov, N., Stefanova, S., Stoyanova, T., S; Gachovska T. 1999. The effect of the treatment voltage on the rate of damage to the plant tissue in electric spark treatment of tobacco leaves. Agricultural Enginering, Sofia ,1, 19-24.

• Armyanov, N., Stefanova, S., Stoyanova, T., Gachovska, T., Dimitrova, St. 1999. Some investigation into electrical processing of tobacco leaves. Energy and Agriculture the third Millennium. Athina, 846 – 853.

• Armyanov, N., Stefanova, S., Stoyanova, T., Gachovska, T., Dimitrova, St. 1999. The principles of electrodes system in the electric spark equipment for tobacco leaves treatment. Agricultural Enginering, Lithua, Raudonvaris, 34(4), 63-75.

• Armyanov, N., Stefanova, S., Stoyanova, T; Gachovska. T. 1998. Investigation of the energy consumption of the tobacco leaves feed to the eclectic spark machinery. Electrotechnic and Electronics, Sofia, 1, 51- 53.

• Armyanov, N., Palov I., Gachovska T. 2002. Some research findings from preplanting electric spark processing of potato tubers. EE&AE, – International Scientific Conference – 04-06. 04.2002, Rouse, Bulgaria, 305-310.

Patent

(WO/2008/034228) Ngady M., Raghavan V., Gachovska T., (published 27.03.2008). Enhanced juice extraction from alfalfa mush using pulsed electric field pretreatment.

Awards & Honors

• Poster presentation in UNL - Honorable Mention

• Teacher Assistant and Research Fellowship, University of Nebraska- Lincoln, NE 2008-2012.

• Research fellowship, University of Ruse, Ruse, Bulgaria 1999-2002.

• Second Prize in the National Electrical Engineering Contest, Sofia 1986.

• Scholarships for excellence in undergraduate study, University of Ruse, Ruse, Bulgaria 1985-1990.

References are available on request

Contact this candidate