National Institute of Technology, Meghalaya

About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Computer science. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

Study of lightning phenomena on UG cables based on soil resistivity

Abstract: Lightning stroke has strong impact on the underground (UG) cables. Assessment of the effect of lightning on UG cables is important for optimal design of protection system and to enhance the reliability of power transmission and distribution. In this work, the effect of lightning on UG cables is studied based on the resistivity of the soil. An empirical formula is used to estimate the magnitude of lightning current that may strike the ground, depending on the resistivity of the soil. Lightning performance and prediction model is used to estimate the maximum breakdown distance in the soil, magnitude of current impacting the cable laid near to the point of lightning strike. Also the over voltage developed between the cable core and sheath is estimated. It is seen that, the characteristics of the soil strongly influences the lightning performance. Maximum breakdown distance, impacting current on cables, location for safe burial of cables in soil are affected by soil characteristics.

Correlation between the density and refractive index with higher homologues 5O.m series

Abstract: The density dependent refractive indices study of the higher homologues liquid crystalline compound 5O. m (m = 14, 16) is reported in this paper. The compounds are interdigitated with highly skewed alkyl chains. The density study of the sample has been done with the capillary tube method. For the refractive indices study, the extraordinary component ne and the ordinary component no of the samples were measured by the thin prism technique with He-Ne laser beam of wavelength 633 nm. These the results obtained were used to find the correlation between the density and refractive indices in both samples.

Numerical Investigation of Blood Flow Characteristics through Cannulated Aorta

Abstract: Cannulation of the aorta is done in order to provide oxygenation and circulatory function through the use of the heart lung machine during cardio-pulmonary bypass (CPB). The nature of the blood flow through the aorta and its ramifications during CPB is mostly linear as compared to the physiological flow, which is pulsatile in nature. This leads to the development of multiple morbidities caused by the development of emboli and atheromas. Perioperative postoperative care is necessitated by these conditions. As such the understanding of the blood flow characteristics is necessitated in order to effectively prevent the formation of emboli and to prevent the \"Sandblasting\" effect. The authors in this work seek to investigate the nature of blood flow through the aorta under such circumstances. The results obtained show the nature of blood flow in the cannulated aorta as well as the optimum angle of placement of the cannula with respect to the aortic wall.

Effect of loading rates on the behaviour of epoxy-repaired RC beam–column connections

Abstract: Reduced-scale external RC beam–column specimens with three typical deficiencies as beam weak in flexure (BWF), beam weak in shear (BWS) and column weak in shear (CWS) were tested under cyclic excitations of different frequencies, varying from .025 to 1.0 Hz. These damaged specimens were repaired using epoxy resin injection. Parameters like load carrying capacity, stiffness degradation and energy dissipation were monitored for exploring the effect of rate of loading on all the beam–column connections in a holistic manner. The repaired connections exhibited equal or marginally better performance and hence the adopted repairing strategies could be considered as satisfactory. Test results also showed that faster rate of loading produced fewer and more localised cracks on the specimens than those at the slower rate. Test results further showed that the rate effect is significant in beam–column connection with BWF, while the same is not so significant in BWS and CWS specimens.