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Gait analysis is the study of human motion during walking or running. It is often used to evaluate and treat individuals with movement disorders or to assist in the design of prosthetics and other assistive devices. The phase detection aspect of gait allows for the quantification of gait characteristics, assessment of effectiveness of interventions and monitoring the changes in gait over time. The objective of the paper is the design and development of a Force Sensing Resistor (FSR) embedded insole that can be placed in shoes for detection of phases during the human gait and its classification. The classification using FSR is achieved by placing sensors at strategic locations on the foot, to detect the forces applied during walking. The data collected by these sensors are used to identify specific phases of the gait cycle—particularly heel strike, midstance, toe-off and swing, by analysing the patterns of data during movement. The layout and number of FSRs is determined through literature review and is followed by the insole fabrication. The wireless transmission of gait data through the FSRs is actuated for ten healthy adults. Machine Learning (ML) program is consequently developed based on all available classification algorithms of supervised learning namely—Logistic Regression, Naïve Bayes, Decision Tree, Random Forest and Support Vector Machine (SVM). The algorithm is trained and tested on separate FSR data sets from which the predictive decision in each gait cycle is attained. In the phase classification aspect, SVM, Naïve Bayes, and Random Forest achieved the highest accuracy of 91.54%, followed by Decision Tree at 90.77% and Logistic Regression at 89.23%. In conclusion, the optimal number of FSRs and their location in smart insole for gait phase detection is resolved. Gait phase classification is also attained. FSR embedded insole thus, provides a promising solution in accurately identifying and categorizing gait phases.

The naturally commutated d.c. link inverter is employed for feeding the active power to the reluctance motor. The lagging reactive power requirements of the motor and inverter fulfilled by connecting the capacitor bank at machine terminals. A wide range of speed control is obtained by varying the d.c. link voltage and value of the terminal capacitors.

Kaolinised rocks occurring at the northern part of Mulieh village of Jaintia Hills, Meghalaya were studied with a view to identifying the possible mineralogical set up. The investigation was confined mainly on the crude as well as washed fractions of the clay as obtained from systematic levigation of the crude by gravity sedimentation technique. The study included the finding out of the physical, chemical, rational, base exchange capacity, pyrometric cone equivalent, petrographical, thermo- chemical and XRD characteristics of all the fractions of the clay. The results indicated that the clay in its crude form was primary in origin and contained substantial amount of free quartz, and was kaolinitic in character. On processing by gravity sedimentation the clay was found to be almost free from quartz and contained mineral kaolinite as the predominant phase along with quartz, microcline, muscovite, illite and rutile in minor amounts.

The physico-thermal properties of kaolinised rocks occurring at the Northern part of Mulieh village of Jaintia Hills, Meghalaya were studied with a view to find out its possible use in ceramic industry. The study was conducted on the crude as well as washed fractions of Grade I and Grade II clays obtained by systematic levigation. The investigation included the determination of unfired physical properties of all the three fractions of the clay leading to the suitability in ceramic industry. The PCE values and the fired characteristics at six different temperatures starting from 1200° to 1450°C at the interval of 50°C of all the three levigated fractions of the clay were determined. The results indicated that the crude clay being non-slaking in nature and contained about 68% residual fraction required proper processing for using it successfully in producing ceramic articles. Grade I clay when mixed with other ceramic raw materials in right proportions may prove promising in the manufacture of ceramic whiteware products except, of course, porcelain crockery due to the off-white fired colour. On the other hand, Grade II fraction which the industry may find useful if formulated judiciously considering the physico-chemical properties of the clay.

The physico-chemical characteristics of kaolinised rocks occurring at the Northern part of Mulieh village of Jaintia Hills in Meghalaya were studied with a view to finding out their possible industrial applications. The study was conducted on the washed fraction (Grade I) of the clay as obtained by systematic levigation based on the principle of gravity sedimentation. The investigation included characterization of the clay for its suitability in paper, textile, rubber and insecticide industries as per BIS specification. The clay was further evaluated for its application in the field of ceramic whitewares, and this included definite formulation of various types of ceramic products and finding out the thermo-mechanical properties at different temperatures subject to the requirements of the respective products.The results indicated that the clay was quite suitable for direct use in paper, textile, rubber and insecticide industry except as a coating material in paper or textile. Due to off- white colour of the clay, its use was restricted in making porcelain tablewares and alike; otherwise it suited well in all the other ceramic applications.

An attempt was made to fabricate different ceramic items made of common clays. The fast depletion of higher grade china clays and progressive increase in the cost of fuel necessitated the development of ceramic bodies by incorporating abundantly available low-cost, inferior grade ceramic clays fired at a low temperature but without compromising with the desired properties. With preliminary processing, the physical properties of the clay—both unfired and fired, were systematically investigated in detail. The utilisation of the common clay along with other ceramic ingredients in right proportion in the production of various types of semi-vitreous and vitreous articles was found to be quite viable.

N2O‐saturated aqueous solutions of Mn(ClO4)2have been γ‐irradiated and the colloidal manganese oxides formed have been investigated using conductometric and optical techniques.

Kinetics and mechanism of the two‐electron oxidation of (Ia) by Br2 are investigated in bromide ion medium between pH 3.1 and 7.6 at 25 °C. In the presence of excess of Br2 or Ni(II), oxidation is monophasic leading to the initial product (Ib), a formal Ni(IV) species, which undergoes subsequent reactions to an unknown product or the Ni(III) complex (Ic), depending on the reaction conditions.

Bilayer lipid membranes from bovine brain phosphatidylserine, glyceryl monooleate, and (I) are used as matrices for microcrystalline semiconductors (CdS, CuS, Cu2S, PbS, ZnS, HgS, and In2S3), stable for several days, which are generated in situ from appropriate metal ion precursors and H2S injected into the bathing solution on opposite sides of the membrane.

IONOSPHERIC observations carried out for more than two decades have clearly established the existence of correlation between the variation of electron contents of the different ionospheric layers and solar activity. It has been found that there is a general increase in the ionization density during the period of maximum sunspot numbers. This general increase, as expected, has also been noticed during the present phase of maximum solar activity in the routine ionospheric observations made at the Wireless Laboratory of the University College of Science, Calcutta. Besides this general increase, however, certain peculiar features of the diurnal variation of the ionization density have also been observed.