First principles design of divacancy defected graphene nanoribbon based rectifying and negative differential resistance device

We have elaborately studied the electronic structure of 555-777 divacancy (DV) defected armchair edged graphene nanoribbon (AGNR) and transport properties of AGNR based two-terminal device constructed with one defected electrode and one N doped electrode, by using density functional theory and non-equilibrium Green's function based approach. The introduction of 555-777 DV defect into AGNRs, results in a shifting of the {\pi} and {\pi}* bands towards the higher energy value which indicates a shifting of the Fermi level towards the lower energy. Formation of a potential barrier, very similar to that of conventional p-n junction, has been observed across the junction of defected and N doped AGNR. The prominent asymmetric feature of the current in the positive and negative bias indicates the diode like property of the device with high rectifying efficiency within wide range of bias voltages. The device also shows robust negative differential resistance (NDR) with very high peak-to-valley ratio. The analysis of the shifting of the energy states of the electrodes and the modification of the transmission function with applied bias provides an insight into the nonlinearity and asymmetry observed in the I-V characteristics. Variation of the transport properties on the width of the ribbon has also been discussed.Comment: 28 Pages, 12 Figures and 1 tabl

Exploring the Psychological Dynamics: A Comprehensive Analysis of Personality Variables in male Taekwondo Athletes

Taekwondo is a Korean martial art which is practised by many students all around the world. It is commonly recognised that psychological characteristics play a major role in mental training and are among the most important aspects of a player's overall preparation. The objective of the study was to explore the psychological dynamics of male Taekwondo athletes on Personality Variables. To attain the objective the present study focuses on the status of Taekwondo Players of different levels and analyses their personality variables. For this purpose, 20 male Taekwondo Players were selected randomly from different Taekwondo Academies of Delhi on the basis of the level of the participations. The age of the selected subjects was in range of 18 to 25years. Big Five Inventory (BFI) which was developed by John,O.P., & Srivastava,S.(1999) was selected to identify the personality variables of the subjects. SPSS was used for the calculation of mean, standard deviation and z-score of the data. Microsoft Excel was later used for the graphical representation of the results. The results revealed that Extraversion has the lowest and the highest Z scale value. It also revealed that most of the Taekwondo players shows extrovert personality, have an agreeable nature, are conscientious and neurotic. Most of the Taekwondo players are also Open to new experiences

Knowledge, attitude and belief about contraception in post-partum and post abortal women in a tertiary care centre

Background: In this modern era where women have achieved the highest positions in politics, corporate world and conquered the moon, on the other side she is still fighting for her right, i.e. health. For this the women should become economically independent. The concept of waiting for a son preference by the society should be discouraged. Postpartum and post abortal period are very crucial for a women especially for many of those belonging to the villages as this may be the only time she comes in contact with a health personnel. Hence counseling should be given to all patients at this time.Methods: We conducted a cross-sectional study in the department of obstetrics and gynecology of sir Sunder Lal hospital between August 2013 to October 2013. 230 post-partum and post abortal women were interrogated and counseled about various methods of contraception. Awareness about emergency contraception pill and MTPill was also noted.Results: Only 69% had heard about various methods of contraception. IUCD and OCP were known to most patients. Most patients knew about contraception from television and doctors. After counseling 97% patients wanted contraception. Most patients opted for IUCD, Barrier method and DepoProvera. 20% patients knew about emergency contraception pill and 34.4% patients about MTPill.Conclusions: There is lack of awareness of contraception, emergency contraception and medical abortion in women under study. Regular counseling is a must to all post-partum and post abortal women. Information should be provided about various methods and patients should be given a choice to choose the method of contraception