A closed-form, two-dimensional analytical solution is developed to investigate the acoustic performance of a concentric circular Helmholtz resonator lined with fibrous material. The effect of density and the thickness of the fibrous material in the cavity is examined on the resonance frequency and the transmission loss. With the expressions for the eigenvalue and eigenfunction in the cavity, th...

An analytical model for a composite material containing magnetic platelets is presented based on the modified asymmetric Bruggeman’s effective medium theory for permeability. The model takes into account crushing of bulk magnetic material and form factors of inclusions.

Abstract Multilayer gradient absorbing materials are difficult to be modeled and simulated in practical applications. To solve this problem, a method of the inversion equivalent electromagnetic parameters multilayer based on annealing algorithm is proposed paper. The reflectivity material different forms polarization obliquely incident at angles calculated, then used calculate incidence angle s...

the radar cross section of a target plays an important role in the detection of targets by radars‎. ‎this paper presents a new method to predict the bistatic and monostatic rcs of coated electrically large objects. ‎the bodies can be covered by lossy electric and/or magnetic radar absorbing materials (rams)‎. ‎these materials can be approximated by the fresnel reflection coefficients‎. ‎the pro...

Sebagai negara kepulauan, Indonesia bersengketa dengan lain terkait klaim hak berdaulat di Laut Natuna Utara. Maka dari itu, diperlukan strategi pengawasan yang tepat untuk dapat mencegah dan memerangi illegal fishing Utara agar sumber daya ikan dilindungi berkelanjutan, serta tegaknya kedaulatan Indonesia. Sejak penemuannya, radar telah sangat memengaruhi semua domain peperangan militer, terma...

The design, analysis, and fabrication of a prototype triaxial applicator is described. The applicator provides both reflected and transmitted signals that can be used to characterize the electromagnetic properties of materials in situ. A method for calibrating the probe is outlined and validated using simulated data. Fabrication of the probe is discussed, and measured data for typical absorbing...

Ultraviolet (UV) microscopy was used to study the capacity of yeast (ATCC 10231 and 10261) and filamentous (ATCC 10259) strains of Candida albicans to accumulate UV-absorbing materials from a medium supplemented with purines, pyrimidines, amino acids, or related compounds as the main nitrogen source. All strains accumulated UV-absorbing compounds when adenine, adenosine, isoguanine, xanthine, o...