INFLUENCE OF UTLTRASOUNDS ON STRUCTURAL AND MORPHOLOGICAL PROPERTIES OF PbS DEPOSITED ON GLASS SUBSTRATE

Chemical bath deposition (CBD) and ultrasonic chemical bath deposition (US-CBD) on glass substrates of PbS crystals from lead nitrate, thiourea alkaline aqueous solutions have been studied. The influence of the ultrasonic vibration on the PbS crystals deposition by CBD through observing the changes in structure and morphology was studied. Structural properties were investigated by X ray -diffraction and the average grain size has been calculated applying different methods. Ultrasounds lead to an increase of crystallites size and strain. SEM micrographs showed that the PbS obtained from static baths are formed from near spherical grains with average size of 183 nm while in the case of ultrasonic baths cubical particles of 257 nm were formed

Certain subclasses of multivalent functions defined by new multiplier transformations

In the present paper the new multiplier transformations \mathrm{{\mathcal{J}% }}_{p}^{\delta }(\lambda ,\mu ,l) (\delta ,l\geq 0,\;\lambda \geq \mu \geq 0;\;p\in \mathrm{% }%\mathbb{N} )} of multivalent functions is defined. Making use of the operator $\mathrm{{\mathcal{J}}}_{p}^{\delta }(\lambda ,\mu ,l),$ two new subclasses $\mathcal{P}_{\lambda ,\mu ,l}^{\delta }(A,B;\sigma ,p)$ and $\widetilde{\mathcal{P}}_{\lambda ,\mu ,l}^{\delta }(A,B;\sigma ,p)$\textbf{\ }of multivalent analytic functions are introduced and investigated in the open unit disk. Some interesting relations and characteristics such as inclusion relationships, neighborhoods, partial sums, some applications of fractional calculus and quasi-convolution properties of functions belonging to each of these subclasses $\mathcal{P}_{\lambda ,\mu ,l}^{\delta }(A,B;\sigma ,p)$ and $\widetilde{\mathcal{P}}_{\lambda ,\mu ,l}^{\delta }(A,B;\sigma ,p)$ are investigated. Relevant connections of the definitions and results presented in this paper with those obtained in several earlier works on the subject are also pointed out

SPECII PREVERNALE ŞI VERNALE DIN REZERVAŢIA NATURALÃ “CHEILE TURZII”

Prevernal and vernal species from the “Cheile Turzii” natural reserve. In this paper it has been tried to reinventorize the vernal and prevernal species from the “Cheile Turzii” Natural Reserve. The determination of the plants had been done after trips on the field during the months of March and April. In order to fill the phytocenological tables, the species had been analysed after the main ecological indicators (H,T,R), after the bioforms and after the geographic elements. A number of 47 species have been identified, belonging to 40 genres and 25 botanical families. Analising the ecological indicators, it has been proven that 46% of the species are mezophyte, 56% of the species are micromezotherme and 56% species are neutrophyle. The processing of the bioforms indicators shows the existance of 44% hemicriptophyte species and as a geographic element, eurasiatics species dominate with a percentage of 26%. From the economic point of view, these species have low value, this value being compensated by the ecoprotective one. We notice the presence of some endemic species such as Viola jooi, Pulmonaria rubra, Hepatica transilvanica, Dentaria glandulosa and some rare species such as Muscari neglectum, Iris sintenisii