Evaluation of design parameters of eight dental implant designs: A two‑dimensional finite element analysis

Aim: Implants could be considered predictable tools for replacing missing teeth or teeth that are irrational to treat. Implant macrodesign includes thread, body shape and thread design. Implant threads should be designed to maximize the delivery of optimal favorable stresses. The aim of this finite element model study was to determine stresses and strains in bone by using various dental implant thread designs.Materials and Methods: A two‑dimensional finite element model of an implant–bone system is developed by using Ansys. An oblique load of 100 N 45° to the vertical axis of implant as well as a vertical load was considered in the analyses. The study evaluated eight types of different thread designs to evaluate stresses and strains around the implants placed in D1 bone quality.Results: Forty‑five‑degree oblique von Mises stresses and strains were the highest for the filleted and rounded square thread with an angulation of 30° (216.70 MPa and 0.0165, respectively) and the lowest for the trapezoidal thread (144.39 MPa and 0.0015, respectively).Conclusions: The findings in this study suggest that the filleted and rounded square thread with an angulation of 30° showed highest stresses and strains at the implant–bone interface. The trapezoidal thread transmitted least amount of stresses and strains to the cortical bone than did other models

Reach and Operating Time Correction of Digital Distance Relay

Current and voltage signals recieved from conventional iron core Current Transformer (CT) and Voltage Transformer plays very important role for correct operation of Distance Distance Relay (DDR). Increase in secondary burden connected to CT causes it to saturate at earlier stage. The saturated CT produces distorted secondary current, causing DDR to under reach and to operate by certain time delay. Rogowski Coils (RCs) are attaining increased acceptance and use in electrical power system due to their inherent linearity, greater accuracy and wide operating current range. This paper presents use of RC as an advanced measurement device suitable for DDR. Case study for validation of use of RC is carried out on low voltage system. The simulation results of Distance protection scheme used for protection of part of 220kV AC system shows excellent performance of RC over CT under abnormal conditions

Concept of Rakta Dhatu w.s.r. to Rakta Pradoshaja Vikara

Dhatu (tissue) is an entity by which sustenance, growth and nourishment of the body takes place. Dhatu are the functional apparatus of the Dosha (body humours). Rakta Dhatu is the 2nd Dhatu. It is produced from the Prasada Bhaga of Rasa Dhatu with the help of Bhutagni and Rasa Dhatwagni. Rakta is word originated Sanskrit word from ‘Raj Ranjane’ meaning is to stain. If white cloth is stained with this Dhatu (tissue) it become red coloured hence it is called as Rakta. As it is one of the seven Dhatu, (tissue) it is present in entire part of the body. However it may present in large quantity in some places & may be functioning specifically in context to some organ. Such places are known as Sthana (location) of the Raktadhatu (Blood) Raktavaha Strotas (channel) is main site of Raktadhatu (Blood). Principle organs of this Strotas are liver & spleen

Clinical evaluation of the effect of Khanda Kushmanda Avaleha in Rakta Pradara (Abnormal uterine bleeding)

Background: Raktapradara manifesting as excessive bleeding per vagina is seen to be an age old disease known to mankind since the era of Veda and Purana. Excessive and irregular menstrual bleeding condition is similar to Raktapradara a gynaecological condition mentioned in Ayurvedic classics. Rakta Pradara is one among the Rakta Pradoshaja Vikara and characterized by Artava Ati Pravrutti, Deerga Kala Pravrutti, Anruta Kala Pravrutti, Daha in Adho Vankshana Pradesha, Sroni, Prushta and Kukshi, Shoola in Garbhashaya, Angamardha etc. Objectives: To clinically evaluate the effect of Khanda Kushmanda Avaleha in Raktapradara. Materials and Methods: The patients attending the O.P.D. and I.P.D. of S.V.M Ayurvedic Medical College and PG Centre, Ilkal, were randomly divided into 2 groups, Group A was treated with Khanda Kusmanda Avaleha and Group B was treated with Placebo Capsule. Results: Khanda Kushmanda Avaleha cured 12 patients i.e. 85.71% followed by markedly improvement in 2 patients i.e. 14.28%. Placebo capsule mildly improved 61.54% i.e. 8 patients followed by no improvement to 38.46% i.e. 5 patients. Discussion: The effect of therapy on chief complaints in Group A is better than Group B. Percentage wise Khanda Kusmanda Avaleha gave 86.3% relief on duration of blood loss, 85.7% on Interval between two cycles and 58.3% on Amount of total blood loss during one period while Placebo capsule gave 27.2% relief on Duration of blood loss, 20% on Interval between cycle, and 21.05% relief on Amount of blood loss. So, more relief was observed on chief complaints in Group - A i.e. Khanda Kusmanda Avaleha

PIM: Video Coding using Perceptual Importance Maps

Human perception is at the core of lossy video compression, with numerous approaches developed for perceptual quality assessment and improvement over the past two decades. In the determination of perceptual quality, different spatio-temporal regions of the video differ in their relative importance to the human viewer. However, since it is challenging to infer or even collect such fine-grained information, it is often not used during compression beyond low-level heuristics. We present a framework which facilitates research into fine-grained subjective importance in compressed videos, which we then utilize to improve the rate-distortion performance of an existing video codec (x264). The contributions of this work are threefold: (1) we introduce a web-tool which allows scalable collection of fine-grained perceptual importance, by having users interactively paint spatio-temporal maps over encoded videos; (2) we use this tool to collect a dataset with 178 videos with a total of 14443 frames of human annotated spatio-temporal importance maps over the videos; and (3) we use our curated dataset to train a lightweight machine learning model which can predict these spatio-temporal importance regions. We demonstrate via a subjective study that encoding the videos in our dataset while taking into account the importance maps leads to higher perceptual quality at the same bitrate, with the videos encoded with importance maps preferred $1.8 \times$ over the baseline videos. Similarly, we show that for the 18 videos in test set, the importance maps predicted by our model lead to higher perceptual quality videos, $2 \times$ preferred over the baseline at the same bitrate

Differential diagnosis of tuberculous meningitis from partially-treated pyogenic meningitis by cell ELISA

BACKGROUND: Tuberculous meningitis (TBM) is a major global health problem, and it is sometimes difficult to perform a differential diagnosis of this disease from other diseases, particularly partially-treated pyogenic meningitis (PTPM). In an earlier study, we demonstrated the presence of a 30-kD protein antigen in cerebrospinal fluid (CSF) of TBM patients. We have also shown that lymphocytes from CSF of TBM patients respond differently to this antigen than do those from PTPM patients. The purpose of this study was to develop an assay that can discriminate between TBM and PTPM. METHODS: We developed a cell enzyme-linked immunosorbant assay (Cell ELISA) to quantitatively measure production of antibodies against the 30-kD protein in B cells from CSF of TBM and PTPM patients. RESULTS: The cell ELISA yielded 92% (11/12) sensitivity and 92% (11/12) specificity for the differential diagnosis of TBM from PTPM. CONCLUSION: When induced with the 30-kD protein antigen, B cells derived from CSF of TBM patients respond to IgG production within 24 h while those derived from PTPM patients do not respond

Fluctuations and Instabilities of Ferromagnetic Domain Wall pairs in an External Magnetic Field

Soliton excitations and their stability in anisotropic quasi-1D ferromagnets are analyzed analytically. In the presence of an external magnetic field, the lowest lying topological excitations are shown to be either soliton-soliton or soliton-antisoliton pairs. In ferromagnetic samples of macro- or mesoscopic size, these configurations correspond to twisted or untwisted pairs of Bloch walls. It is shown that the fluctuations around these configurations are governed by the same set of operators. The soliton-antisoliton pair has exactly one unstable mode and thus represents a critical nucleus for thermally activated magnetization reversal in effectively one-dimensional systems. The soliton-soliton pair is stable for small external fields but becomes unstable for large magnetic fields. From the detailed expression of this instability threshold and an analysis of nonlocal demagnetizing effects it is shown that the relative chirality of domain walls can be detected experimentally in thin ferromagnetic films. The static properties of the present model are equivalent to those of a nonlinear sigma-model with anisotropies. In the limit of large hard-axis anisotropy the model reduces to a double sine-Gordon model.Comment: 15 pages RevTex 3.0 (twocolumn), 9 figures available on request, to appear in Phys Rev B, Dec (1994