MAKSIMALISASI FITUR APLIKASI KULIAH ONLINE BAGI MAHASISWA

Abstrak Pandemi Covid – 19 yang masih terus berlangsung hingga kini membuat pertemuan secara online menjadi pilihan untuk berbagai aktifitas termasuk perkuliahan. Untuk mempermudah tatap maya maka beberapa aplikasi pun digunakan agar bisa memperlancar proses pembelajaran. Aplikasi online yang paling sering digunakan adalah Zoom, Google Meet dan E-Learning. Aplikasi – aplikasi ini juga digunakan oleh kedua mitra kegiatan PkM ini yakni mahasiswa baru prodi ilmu komunikasi dan prodi ilmu politik. Peserta yang terlibat dalam kegiatan ini berjumlah 30 orang yang berasal dari tujuh kelas semester satu pada kedua prodi diatas. Adapun materi yang disampaikan oleh para narasumber berfokus fitur – fitur yang paling sering dipakai mahasiswa saat kuliah online berlangsung, disertai dengan contoh menu dan tujuan penggunaannya. Para peserta yang terlibat diharapkan bisa memperoleh pengetahuan dan memanfaatkannya saat perkuliahan online. Para dosen tentunya akan terbantu jika teknis pemanfaatan fitur aplikasi bisa di kuasai oleh mahasiswa. Para peserta pun nantinya bisa menjadi katalisator teknis dalam kelas untuk membantu mahasiswa lain saat penggunaan aplikasi – aplikasi tersebut   Abstract The pandemic of Covid-19, which is still ongoing until now, has made online meetings become an option for various activities, including lectures. In order to facilitate virtual face-to-face, several applications were being used to facilitate the learning process. The most frequently online applications for lectures that have been applied are Zoom, Google Meet and E-Learning. These applications are also used by the two community dedication partners, namely new students from the communication science and the political science study programs. The participants involved in this activity were 30 people from seven first semester classes in the two study programs above. The materials presented by the speakers were focused on the features that most often used by the students when online lectures, completed by the examples of the menus and their intended use. The participants involved were expected to be able to gain knowledge and finally use it for the online lectures. The lecturers will certainly be helped if the technical use of application features can be mastered by students. The participants can later become technical catalysts in the classroom to help other students when using these applicatio

Raman Optical Activity Using Twisted Photons

Raman optical activity underpins a powerful vibrational spectroscopic technique for obtaining detailed structural information about chiral molecular species. The effect centers on the discriminatory interplay between the handedness of material chirality with that of circularly polarized light. Twisted light possessing an optical orbital angular momentum carries helical phase fronts that screw either clockwise or anticlockwise and, thus, possess a handedness that is completely distinct from the polarization. Here a novel form of Raman optical activity that is sensitive to the handedness of the incident twisted photons through a spin-orbit interaction of light is identified, representing a new chiroptical spectroscopic technique

Probing the chiral nature of electromagnetic fields surrounding plasmonic nanostructures

Copyright © 2013 American Physical SocietyWe investigate the chiral properties of near fields around plasmonic nanostructures and their relation to the electromagnetic chirality C. By combining chiral metal nanoparticles with achiral dye molecules and measuring the circular polarization dependence of the enhanced photoluminescence, we find a correlation between the dissymmetry of the luminescence enhancement and the calculated values of C. These effects are strong (∼10−1), despite the weak circular dichroism of the particles (∼10−5). We further show that C represents the chiral selectivity of the near-field coupling between an emitter and a nanoantenna

Further monoterpene chromane esters from Peperomia obtusifolia: VCD determination of the absolute configuration of a new diastereomeric mixture

A reinvestigation of the monoterpene chromane ester enriched fraction from Peperomia obtusifolia using chiral chromatography led to the identification of a minor peak, which was elucidated by NMR and HRMS as fenchyl-3,4-dihydro-5- hydroxy-2,7-dimethyl-8-(3″-methyl-2″-butenyl)-2-(4′-methyl- 1′,3′-pentadienyl)-2H-1-benzopyran-6-carboxylate, the same structure assigned to two other fenchyl esters described previously, pointing out a stereoisomeric relationship among them. Further NMR analysis revealed that it was actually a mixture of two compounds, whose absolute configurations were determined by VCD measurements. Although, almost no vibrational transitions could be assigned to the chiral chromane, the experimental VCD spectrum was largely opposite to that obtained for the average experimental VCD [(2S,1‴R,2‴R,4‴S + 2R,1‴R,2‴R,4‴S)/2] for fenchol derivatives. These results allowed us to assign the putative compounds as a racemic mixture of the chiral chromane esterified with the monoterpene (1S,2S,4R)-fenchol, which had not been identified in our early work.Fil: Batista Junior, João Marcos. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Batista, Andrea N. L.. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Kato, Massuo J.. Universidade de Sao Paulo; BrasilFil: Bolzani, Vanderlan S.. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: López, Silvia Noelí. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario; ArgentinaFil: Nafie, Laurence A.. Syracuse University; Estados UnidosFil: Furlan, Maysa. Universidade Estadual Paulista Julio de Mesquita Filho; Brasi

Calculation of Raman optical activity spectra for vibrational analysis

By looking back on the history of Raman Optical Activity (ROA), the present article shows that the success of this analytical technique was for a long time hindered, paradoxically, by the deep level of detail and wealth of structural information it can provide. Basic principles of the underlying theory are discussed, to illustrate the technique's sensitivity due to its physical origins in the delicate response of molecular vibrations to electromagnetic properties. Following a short review of significant advances in the application of ROA by UK researchers, we dedicate two extensive sections to the technical and theoretical difficulties that were overcome to eventually provide predictive power to computational simulations in terms of ROA spectral calculation. In the last sections, we focus on a new modelling strategy that has been successful in coping with the dramatic impact of solvent effects on ROA analyses. This work emphasises the role of complementarity between experiment and theory for analysing the conformations and dynamics of biomolecules, so providing new perspectives for methodological improvements and molecular modelling development. For the latter, an example of a next-generation force-field for more accurate simulations and analysis of molecular behaviour is presented. By improving the accuracy of computational modelling, the analytical capabilities of ROA spectroscopy will be further developed so generating new insights into the complex behaviour of molecules