Keywords : microwave


The Development of Microwave Applications in Medical Field

Qusay Kh. Al_Dulamey

Rafidain Journal of Science, 2021, Volume 30, Issue 2, Pages 23-39
DOI: 10.33899/rjs.2021.168340

Through this analysis, we conclude that there is no fixed limit to the radiation threat, but that the risk begins at any stage. High frequency electromagnetic waves have detrimental effects, in particular, on the body and sensitive cells. One of the susceptible organs affected by radiation is the reproductive system, though it does not contain a high percentage of blood. This plays an important role in reducing the heat generated by the cumulative microwave effect. Most studies have agreed that these radiation communication systems have an effective effect on red and white blood cells due to the heme's cellular structure, which is influenced by magnetic and electrical fields, creating a change in the cellular composition and composition. Thus, a shift in cell function clinically visible symptoms of photo damage are fine lines and rhytides. Traditionally, for nonsurgical facial rejuvenation, truncated and non-truncated lasers were used, in addition to that its cumulative side effects and its heroes time are in the work. Initially used to target photo damage, radio frequency represents an idea of radiation surgery technology. It is different from lasers   such as current of an electric is used as well as a light source. It is widely used for treating slouch of skin, deflations, skin tags and freckles, and dimple in dermatology. This work aims to show the different kinds of radiofrequency tools and their application. Assessing the effectiveness of these tools is based on facts.  This paper discusses the latest RF function, applications, clinical advance.         Application guide for various RF applications. The findings were positive with multiple clinical tools of radio waves, although more trials were non-randomized, non-comparative trials using local methods of assessment. Most non- truncated radio waves are a healthy, suggest method that produces moderate results for skin rejuvenation and cellulite therapy. Radio wave is act as replace from surgery.

Single-Stage Amplifiers Simulation for Microwave Applications Using S-Parameters

laith Al Taan; Nawfal Y. Jamil; Salah I. Saleh

Rafidain Journal of Science, 2020, Volume 29, Issue 3, Pages 47-60
DOI: 10.33899/rjs.2020.166312

A single-stage amplifier circuits containing transistor as BJT or FET transistor were designed for the microwave application using S-parameters, and developed as a lumped circuit then converted to its equivalent microstrip distributed circuits on different substrates such as Alumina (er=9.8) and Beryllia (er=6.3). The output results as power gain Gp, noise figure NF, and stability factor K were obtained. These results were compared with other published worked included circuits having the same conditions. The comparison shows that in case of the feedback applied to the circuit the Gp achieved about (~1.5) dB for BJT circuits along (0.6-1) GHz and noise figure increased about double, where for FET circuit the increasing in Gp about (7) dB along (2) GHz, and noise figure was less than BJT circuit. The physical characteristics are discussed with respect to substrate and show that the substrate with high permittivity was helpful to reach the higher operating frequency and good power gain values.

Single-Stage Amplifiers Simulation for Microwave Applications Using S-Parameters

laith Al Taan; Nawfal Y. Jamil; Salah I. Saleh

Rafidain Journal of Science, 2020, Volume 29, Issue 1, Pages 47-60
DOI: 10.33899/rjs.2020.166311

A single-stage amplifier circuits containing transistor as BJT or FET transistor were designed for the microwave application using S-parameters, and developed as a lumped circuit then converted to its equivalent microstrip distributed circuits on different substrates such as Alumina (er=9.8) and Beryllia (er=6.3). The output results as power gain Gp, noise figure NF, and stability factor K were obtained. These results were compared with other published worked included circuits having the same conditions. The comparison shows that in case of the feedback applied to the circuit the Gp achieved about (~1.5) dB for BJT circuits along (0.6-1) GHz and noise figure increased about double, where for FET circuit the increasing in Gp about (7) dB along (2) GHz, and noise figure was less than BJT circuit. The physical characteristics are discussed with respect to substrate and show that the substrate with high permittivity was helpful to reach the higher operating frequency and good power gain values.

Sterilization of Culture Media for Microorganisms Using a Microwave Oven Instead of Autoclave

Suzan A. Shareef; Payman A. Hamasaeed; Abdulilah S. Ismaeil

Rafidain Journal of Science, 2019, Volume 28, Issue 1, Pages 1-6
DOI: 10.33899/rjs.2019.159390

Different culture media in different volumes were exposed to microwave (MW) irradiation for 2, 3 and 4 minutes to investigate the ability of MW to destroy microorganisms and compared with media sterilized by conventional autoclaving method. MW sterilized media were screened for microbial growth.
Exposure of different microorganisms to microwave irradiation resulted in destruction of all microorganisms within 3 minutes. Using MW for irradiation is a practical, easy, rapid and energy saving way to sterilize different types of culture media with no effects on the quality of culture media and microbial growth after sterilization. It can be used as alternative apparatus instead of autoclave in microbiology laboratories for preparing different sizes in rapid and routine experiments especially in the conditions of the weak electricity current and interruption
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New Complexes of ( 3, 4, 6, 13, 14, 16 – hexaazatricyclo [16,2,2,28,11] tetracosane- 2,5,7,12,15,17-hexaone) with Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)

Saad Kh. Dawood; Falah M. Fakhree

Rafidain Journal of Science, 2013, Volume 24, Issue 5, Pages 76-85
DOI: 10.33899/rjs.2013.74545

In this research, a new ligand 3,4,6,13,14,16-hexaazatricyclo [16,2,2,28,11] tetracosane- 2,5,7,12,15,17-hexaone), (DHC) was prepared from the reaction of cyclohexane-1,4-dicarboxylic acid with semicarbazide using microwave irradiation in solid state. Then, it was reacted with some transition metal(II) ions to form complexes of the type [M(DHC)Cl2], [M(DHC)]Cl2, where M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II). Adducts of the type [M(DHC)(PPh3)Cl]Cl and [M(DHC)(PPh3)]Cl2, were prepared by the reaction of the above complexes with triphenylphosphine in a 1:1 molar ratio. The prepared complexes and adducts were characterized by (C,H,N) analysis, metal content analysis, molar conductance, magnetic moment measurements, electronic and IR spectroscopy, as well as the ligand was characterized by 1H,13C -NMR spectroscopy. The electronic spectra and magnetic measurements indicate that the complexes have octahedral environment around the metal ions.