On the possibility of enhanced efficiency in (Zn, Cd)S dye sensitized solar cell

Nanoparticles of zinc sulphide and cadmium sulphide are synthesized by aqueous chemical method. XRD data show cubic phase for both the systems. UV-Vis absorption spectra of nano ZnS and nano CdS are blue shifted from the respective bulk. The PL spectra of the above dye sensitized nanomaterials show two broad emission at 402 nm and 510 nm (absent in nano ZnS) which are compared with earlier investigations and discussed. The efficiency of dye sensitized nanocrystalline ZnS solar cell was found to be 0.09 % (Eosin Yellowish Dye) and 0.016 % (Methyl Blue dye). The efficiency of dye sensitized CdS was found to be 0.06 % and this makes it possible for improved efficiency. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2213

Rapid keratitis and perforation after corneal collagen cross-linking

© 2020 Purpose: To describe a case of rapid keratitis and corneal perforation after epithelium off collagen cross-linking. Observations: We report a case of a 17-year-old male who underwent collagen cross-linking with the protocol and device approved by the United States Food and Drug Administration (FDA) that developed a corneal infiltrate 3 days after the procedure. He later developed corneal thinning and perforation on day 5 requiring the use of cyanoacrylate glue and a Kontur lens. Despite initial improvement in the infiltrate with fortified antibiotics he later had leakage of aqueous around the glue and a flat chamber requiring an emergent penetrating keratoplasty on postoperative day 16. Conclusion and importance: While collagen cross-linking has been very effective for treating keratoconus and is being recommended more frequently since FDA approval in the United States, severe complications such as corneal perforation requiring early transplant can still occur

Synthesis And Characterisation Of CdxZn1–xS Nanocomposites

CdxZn1 – xS nanoparticles have been synthesized using hydrothermal method. Structural characterization was done by XRD where the lattice structure gradually changes from hexagonal to cubic with increasing percentage of Zn inCdxZn1 – xS nanoparticles. Optical spectroscopy provided evidence that the absorption edges of those nanoparticles can be varied from blue to UV. The nanoparticles exhibit emission peaks that shift to shorter wavelength with increasing percentage of Zn in the compounds CdxZn1 – xS. The control of the composition of CdxZn1 – xS nanoparticles may lead the development of ideal materials for short wavelength diode laser applications. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/951

Penerapan Metode Profile Matching Dalam Sistem Penunjang Keputusan Pemilihan Karyawan Terbaik Pada Lembaga Penyiaran Publik Televisi Republik Indonesia

Penilaian  untuk pemilihan karyawan terbaik biasanya masih dilakukan secara subyektif dan manual, dan kurangnya sistem proses pengambilan keputusan formal ini dapat menjadi masalah. Studi ini bertujuan untuk membangun sistem pendukung keputusan untuk pemilihan karyawan terbaik sesuai dengan persyaratan Lembaga Penyiaran Publik Televisi Republik Indonesia. Metode yang digunakan dalam penelitian ini adalah Profile Matching dengan kriteria yang telah ditentukan oleh Institusi tersebut, yaitu: Kehadiran, Perilaku, Tanggung Jawab, Kerjasama dan Produktivitas. Sistem ini, dikembangkan dengan menggunakan Rational Unified Process (RUP) dan juga alat pengembangan sistem yaitu Unified Modeling Language 2.0 (UML). Hasil dari pengujian didapatkan akurasi sistem mencapai 100%, yaitu semua keluaran sistem untuk rangking karyawan terbaik sama dengan yang dipilih oleh kepala Divisi SDM. Sehingga bisa disimpulkan bahwa hasil penelitian ini dapat dijadikan sebagai alat bantu untuk memilih karyawan terbaik di Lembaga Penyiaran public Televisi Republik Indonesia

Structural, optical and electronic properties of homoepitaxial GaN nanowalls grown on GaN template by laser molecular beam epitaxy

We have grown homoepitaxial GaN nanowall networks on GaN template using an ultra-high vacuum laser assisted molecular beam epitaxy system by ablating solid GaN target under a constant r.f. nitrogen plasma ambient. The effect of laser repetition rate in the range of 10 to 30 Hz on the structural properties of the GaN nanostructures has been studied using high resolution X-ray diffraction, field emission scanning electron microscopy and Raman spectroscopy. The variation of the laser repetition rate affected the tip width and pore size of the nanowall networks. The z-profile Raman spectroscopy measurements revealed the GaN nanowall network retained the same strain present in the GaN template. The optical properties of these GaN nanowall networks have been studied using photoluminescence and ultrafast spectroscopy and an enhancement of optical band gap has been observed for the nanowalls having a tip width of 10-15 nm due to the quantum carrier confinement effect at the wall edges. The electronic structure of the GaN nanowall networks has been studied using X-ray photoemission spectroscopy and it has been compared to the GaN template. The calculated Ga/N ratio is largest (similar to 2) for the GaN nanowall network grown at 30 Hz. Surface band bending decreases for the nanowall network with the lowest tip width. The homoepitaxial growth of porous GaN nanowall networks holds promise for the design of nitride based sensor devices