Debarnob Sarkar

Indian Institute of Management Ahmedabad | IIM · Area of Information Systems

Introduction and objective Nephrectomy leads to derangement of renal function and various adaptive changes by the remaining kidney over a period of time. This study is performed to evaluate the amount of derangement of renal function in donor and radical nephrectomy, how much the remaining kidney adapts over a period of time and the time taken for...

Surgical repair is usually done in intraperitoneal bladder perforation, whereas in genitourinary trauma reports of conservative management exist. We hereby, present a case of an old man with carcinoma prostate having intraperitoneal urinary bladder perforation with enterovesical fistula that was successfully managed non-operatively and conservative...

We have identified 164 somatic mutations in mitochondrial DNA in gingivobuccal oral cancer by deep sequencing the mitochondrial genome from paired tumor and blood DNA samples from 89 patients. We have found evidence of positive selection of somatic nonsynonymous mutations. Non-synonymous mutations in mitochondrial respiratory genes were found to in...

This paper introduces the finite element method is used for predicting the temperature distribution in underground cable, using arch-shaped finite elements with explicitly derived solution matrices. A general derivation of the finite element equations by the method of weighted residuals (Galerkin’s method) is introduced. The arch-shaped finite elem...

This paper presents theoretical and practical investigations on a planar array antenna with four circular radiating patches and square ground plane for high gain applications. The geometry of the antenna has been optimized to obtain peak gain of 11dBi and bandwidth better than 8 GHz. Good radiation characteristics have also been observed. Theoretic...

Steganography and Watermarking are main parts of the fast developing area of information hiding. Steganogra-phy involves hiding of information in a cover media to obtain the stego media, in such a way that the cover me-dia is supposed not to have any embedded image for its unintended recipients. This paper is based on Steganogra-phy, Watermarking a...

In developing electric motors in general and induction motors in particular temperature limits is a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important. Excepting for providing...

Comparative studies of defect generation in thin dry oxides by γ-rays and high electric fields have been made. Stress-anneal-stress cycles with intervening high frequency CVs and quasi-static measurements show that not only is there positive charge build-up due to radiation and field stressing but slow and fast interface states and possibly hole tr...

In this paper a three-dimensional steady-state thermal model of the rotor of an induction motor is presented using finite element formulation and arch shaped elements in the r \(-\) \(\uptheta \) and z plane of the cylindrical co-ordinate system. Excepting for providing a more accurate representation of the problem, the proposed model can also redu...

In developing electric motors in general and induction motors in particular temperature limits is a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important. Excepting for providing...

In developing electric motors in general and induction motors in particular temperature limit is a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important. Excepting for providing...

Mutational landscape of gingivo-buccal oral squamous cell carcinoma reveals new recurrently-mutated genes and molecular subgroups India Project Team of the International Cancer Genome Consortium 1 Gingivo-buccal oral squamous cell carcinoma (OSCC-GB), an anatomical and clinical subtype of head and neck squamous cell carcinoma (HNSCC), is prevalent...

In developing electric motors in general and induction motors in particular temperature limits are a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important. Excepting for providin...

The paper deals with the theoretical and experimental investigation on a simple two-element antenna exhibiting wideband operation. This antenna consists of two monopole antenna elements with modified ground plane. Generally, monopole antenna provides low gain. Here, upto 6 dBi gain has been achieved. Percentage bandwidth of the antenna is 80%. Prev...

Steganography refers to the science of “invisible” communication. Unlike cryptography, where the goal is to secure communications from an eavesdropper, steganographic techniques strive to hide the very presence of the message itself from an observer. The general idea of hiding some information in digital content has a wider class of applications th...

We propose a secret sharing algorithm which allows a secret image to be divided into (n : n >; 2) image shares. The share generation algorithm works by dividing one 8-bit pixel of original secret image into two parts of 4-bits each. We find a pair of 4-bits whose XOR gives a specific 4-bits of secret image. Each pair is then concatenated together t...

In this paper a two-dimensional transient thermal model of the rotor of an induction motor during reactor starting is presented using finite element formulation and arch-shaped elements. Excepting for providing a more accurate representation of the problem, the proposed model can also reduce computing costs. A temperature-time method is employed to...

Five compounds namely, stigmasterol (1 ), (+) sesamin (2), ursolic acid (3 ), corosolic acid (4 ), 3’-O-methyleupatorin (5 ) and eupatorin (6) have been isolated from acetone extract of aerial parts of Plectranthus mollis. Compounds 2, 4 and 5 are being reported here for the first time from the genus Plectranthus. All the compounds were tested for...

In this paper, the design of multi-slot microstrip antenna has been studied. The FEKO®5.5, based on Method of Moment (MoM), is used to determine the simulated results. Artificial Neural Network (ANN) has been used to calculate resonant frequency of the antenna for the given slot length. The results are taken in the frequency range of 1GHz to 3GHz....

ive compounds namely, stigmasterol (1), (+) sesamin (2), ursolic acid (3), corosolic acid (4), 3’-O-methyleupatorin (5) and eupatorin (6) have been isolated from acetone extract of aerial parts of Plectranthus mollis. Compounds 2, 4 and 5 are being reported here for the first time from the genus Plectranthus. All the compounds were tested for their...

Audio Steganography is a method that ensures secured data transfer between parties normally in internet community. In this paper, we present a novel, principled approach to resolve the remained problems of substitution technique of Audio Steganography. In the first level, here we first extract image data from an image file. In the second level, we...

1 Chromosome bands Typically, in higher organisms, each chromosome has a centromere and two arms. The short arm is called the p arm and the longer arm the q arm. Chromosome bands (see Figure 1) are identified by differential staining, usually with Giemsa-based stains, and many disease-related defects have been mapped to these bands; such mappings h...

An automatic head-end crop system on the HSM of Rourkela Steel Plant, capable of cutting the head on the move, has replaced the former manual system, resulting in a reduction in crop size of 20% equating to 1985t/y of strip and improved mill productivity. The system activates the crop shear located before the finishing stands to cut the head of the...

Visual cryptography scheme is a cryptographic technique which allows visual information to be encrypted in such a way that the decryption can be performed by the human visual system, without the aid of computers. In this article, we propose a novel scheme for copyright protection for digital images based on visual cryptography. The proposed method...

This paper is based on a comparative study between different watermarking techniques such as LSB hiding algorithm, (2, 2) visual cryptography based watermarking for color images [3,4] and Randomized LSB-MSB hiding algorithm [1]. Here, we embed the secret image in a host or original image, by using these bit-wise pixel manipulation algorithms. This...

Image encryption is a suitable method to protect image data. Image and text data has their unique features. The available encryption algorithms are good for text data. They may not be suitable for multimedia data. In fact the pixels of natural images are highly correlated to their neighboring pixels. Due to this strong correlation any pixel can be...

Induction machines transient thermal analysis has been a subject of interest for machine designers in their effort to improve machine reliability. The stator being static is prone to high temperature and the study of transient thermal behaviour in the stator is useful to identify causes of failure in induction machines. The paper presents a two-dim...

In this article, a new design for single-layer rectangular microstrip patch antenna has been proposed.This design uses a ground plane with a single slot. It has been shown that by using this slotted ground plane, the resonant frequency has been lowered considerably, thus, reducing the size of the antenna. Using this design, the size of the antenna...

Rourkela Steel Plant, India, has commissioned Hot Strip Mill (HSM), which produces 1.6Mt of hot rolled coils a year by rolling 101,000 slabs each of weight 15.5t at a rolling rate of around 275t/h. An automatic tail end cutting system for cutting the tail of the rolled slab after reduction in the roughing stands, to transfer bar, is designed, devel...

Interest in the area of pattern recognition has been increasing rapidly due to emerging applications, which are not only challenging but also demanding. Feature extraction is a special form of dimensionality reduction in pattern recognition. Our goal is to introduce a simple feature extraction technique for pattern recognition. Pattern recognition...

Single layer single feed dual and multifrequency patch antenna is introduced. Resonant frequency can be reduced and frequency ratio can be increased by cutting unequal rectangular slots at the edge. C band and X band operation can be successfully achieved with a size reduction of about 41%. Multifrequency operation can also be achieved by cutting t...

Antibodies specific to cholesterol was first reported in 1925. It may develop in the body naturally and it is believed that this antibody has a protective role against harmful forms of cholesterol, such as LDL & VLDL. An immunoglobulin protein, anticholesterol may be found in both circulation as well as digestive tract. Many studies have been done...

This study presents theoretical and experimental investigations on novel, compact, single layer and single probe-fed rectangular microstrip patch antennas for dual and multi frequency operation. The novel design is achieved by cutting two rectangular slots at one side of the patch antenna. Compared with the conventional rectangular patch antenna, o...

This paper describes design of a vision system for the purpose of rehabilitation, automation, robotics etc. In our proposed system, ultrasonic pulses are transmitted from six transmitters fitted around the head (in frontal region) of the blind person or on a mobile robot and six receivers are also present with it to collect the reflected pulses com...

Traditional one degree of freedom (DoF) joints are widely used in different mechanical systems. But these traditional joints have some limitations to be used in the field of mobile robotics, as use of multiple 1-DoF joints makes them bulky and can not be easily interfaced with the PC. This paper deals with the design of special types of joints whic...

The study presents theoretical and experimental investigation of a novel, reduced size Microstrip Frequency Selective Surface. The novel design is achieved by cutting some rectangular slots at four sides of a square patch. Compared with conventional square patch Frequency Selective Surface (FSS), this slotted square patch Microstrip FSS can achieve...

Unlabelled: The study was carried out to appraise the serum total cholesterol, triglyceride, HDL-C and LDL-C values in hypertensive patients for providing information to the health-policy planners and also to the clinical practitioners about the importance of routine monitoring of lipid profile in hypertensive patients for prevention of coronary h...

This note presents a novel design of dual-frequency (J- and X-band) microstrip antenna and the experimental results of its performance are reported. In this design, a 'swastika' slot has been cut out from the square microstrip patch antenna. The antenna unit can be incorporated into arrays, and offer the possibility of a compact, light-weight and c...

Here we have proposed a simple method to calculate distance of an object. We have established a relation between shift of an object in two images taken by two cameras placed at a particular distance having a specified distance in between them and distance of the object from camera line. This algorithm may be used in mobile robotics quite efficientl...

Man was fascinated by the nature of color and to its vibrations externally. Thus started the alchemy of colors. India was a forerunner in the art of natural dyes. Natural dyes are renewable by its nature. Natural dye can be extracted from flowers by aqueous method. The portion can be applied on hydrophilic substrate like bast fiber. The hydrophilic...

Hydrophobic fibres are highly crystalline and non-polar polymers hence pose a big problem for dyers in dyeing by traditional methods. In the present work dyeing of hydrophobic fibres in the form of textiles was achieved from eco-friendly yellow natural colouring matter obtained from flowers- a source whose collection does not affect the sustenance...

Marigold flower is grown in plenty in eastern part of India throughout the year and can be a good source of raw material for natural dyes. Three varieties of fresh Marigold flowers viz. lemon yellow, golden yellow and maroon-yellow were taken as raw materials for natural dyeing of cotton, wool and silk textiles. Amount of flower for particular volu...

Measurement of angle in the space is a very critical task and it will become much more critical if we have to do it using a small primary transducer along with a secondary. But we have designed a transducer, which not only measures the angle in space but also interfaceable to PC. It gives a complete impression regarding the position of the bending...

The frequency-selective property of an array of rectangular dipole microstrip patches, resonant at two frequencies in the J band and two other frequencies in the Ku band, has been investigated experimentally. Measured data indicate that the electromagnetic wave transmits well through the frequency-selective surface (FSS) in the frequency range of 8...

This paper seeks to measure the economic costs of occupational diseases falling on the workers and management in the coal mining industry. The high incidence of occupational diseases increases health care expenditure by workers, thereby reducing their disposable income. This is an important component of the cost of occupational diseases on the mine...

New generation portable super-C-arm imaging systems may offer an alternative means of performing coronary angiography at a lower cost compared with a fixed laboratory. We evaluated the use of one such system (GE-OEC 9800) in a district hospital setting. The demographics, procedure and screening times, emitted radiation dose and diagnoses of the fir...

Although it is widely recognized that anisotropy can have a significant influence on the focusing and positioning of migrated reflection events, conventional imaging methods still operate with isotropic velocity fields. Here, we present an application of a migration velocity analysis (MVA) algorithm designed for factorized v(x, z) VTI (transversely...

In recent years theoretical and empirical are focussing on occupational health hazards in industries that deal with gemstone, lime, etc. In this paper the focus is on one such industry – coal. We seek to examine the nature and magnitude of occupational diseases in coal-mining. The socio-economic and technological factors determining the incidence o...

A frequency selective surface (FSS) comprising of a two dimensional array of slotted dipoles resonant at a single frequency is proposed. A computationally efficient method for analyzing this FSS is presented. The formulation is carried out in the spectral domain where the convolution form of the integral equation for the induced current reduces to...

In recent years attention has been increasingly drawn to environmental problems caused by industrial and consumption activities. While theoretical and empirical literature has focused on mainly externalities generated by such activities, the effects of production on the workers may also be significant. Such health hazards are prominent in labour-in...

In this paper, the frequency selective property of an array of rectangular dipole microstrip patches resonant at three different frequencies (within the same frequency band) is investigated. Experimental data indicate a prominent band separation between transmission and reflection bands of the F.S.S. in the normalized transmitted electric field vs....

The frequency-selective property of an array of rectangular dipole microstrip patches resonant at dual frequencies (within the same frequency band) has been investigated experimentally. Measured data indicate a 40 dB separation between the transmission and reflection bands of the frequency-selective surface (FSS) in the normalized transmitted elect...

Thin titanium layers on silicon were ion-beam mixed with arsenic and antimony ions. The layers were reacted by electron beam heating under different time and temperature conditions and the properties of the reacted layers were explored by sheet resistance measurements, SEM and Rutherford backscattering spectrometry (RBS). Reaction times as short as...

The problem of two-dimensional transient heat flow in the stator of induction motor is solved by use of a finite element formulation and arch-shaped elements in the r-θ plane of the cylindrical co-ordinate system. The shape functions and exact solution matrices are derived algebraically for utmost economy in computation. The temperature distributio...

In this paper the problem of two-dimensional steady state heat flow in an induction motor is solved using finite-element formulation and employing simple triangular elements in the xy plane of the rectangular co-ordinate system. The shape functions and exact solution matrices are derived algebraically for utmost economy in computation. The global s...

Kosko (1988) proposed bidirectional associative memory (BAM), where pairs of patterns are encoded. When one of the pair is presented, the other is expected to be recalled. Wang et al. (1990, 1991) have shown that BAM cannot correctly recall a pattern pair, if it is not at a local minima of the energy function. In this paper we propose a method to c...

In this study, three WHO recommended reference strains of Leishmania donovani (DD8), L. tropica (K27) and L. major (5 ASKH) were compared by isozyme analysis of 9 soluble enzymes using cellulose acetate electrophoresis (CAE). The isozyme profile of the three species showed distinct electrophoretic mobilities of the enzymes studied. This technique w...

A new, fault-tolerant, scalable, and modular virtual topology for lightwave networks employing wavelength division multiplexing is proposed. The proposed architecture is based on a hypercube connected ring structure that enjoys the rich topological properties of a hypercube, but it also overcomes one of its drawbacks. In a hypercube, the nodal degr...

The authors exploit the capabilities of lightwave technology in order to construct photonic implementations of “adaptive” and “optimized” distributed queue dual bus (DQDB) structures. These (virtual) structures are linear and multihop in nature, and they can be constructed on any physical topology by exploiting the broadcast-and-select property of...

A total of 88 cases of clinically suspected nonneoplastic lymphadenopathy of cervical group of lymph nodes were studied for immunoglobulin pattern. Diagnosis was clinched by various investigations like ERS. Mantoux test, Chest X ray etc and fine needle aspiration cytology or open biopsy tmd thus catgorised to three groups e.g. tuberculous lymphaden...

The goal of the study described is to exploit the capabilities of emerging lightwave technology and the fact that the IEEE 802.6 MAN is a linear network, to construct near optimal linear multihop lightwave networks. Heuristic algorithms are proposed for constructing photonic implementations of near optimal distributed queue dual bus (DQDB) structur...

Rapid electron beam induced reactions in time scales varying from a millisecond to 100 ms have led to the formation of stable silicide films with the TaSi system. The films exhibit low resistivity, minimum lateral growth and no interfacial broadening with composition varying from TaSi2.0 to TaSi2.2.

A simple technique of achieving a suitable inward slope of the photoresist pattern edges has been developed and the process of aluminium deposition followed by its lifting off from unwanted regions has been successfully performed for lines and spaces of the order of 2.5 micron. Aluminium deposition of various thicknesses and angles has been carried...

Immobilized whole yeast cells have been shown to be efficient converters of sugar to ethanol under laboratory conditions. However, this technology has not been extensively tested either on the pilot scale or with commercial feedstocks. We have employed a packed bed reactor containing Saccharomyces cerevisiae adsorbed on agar beads to establish desi...

1.1. Two new procedures are described for the quantitative assay of “free” and zinc-protoporphyrin in red blood cells.2.2. Major clinical findings have included the following: (i) An average of about 10% of the total erythrocyte protoporphyrin is “free” in normal humans, but about one-third or more is usually “free” in blood of normal cows, rats an...

Injection of nicotine in pregnant rats showed significant increase in gestation period and decrease in foetal number and their weights. All these deleterious effects of nicotine were prevented after simultaneous administration of phentolamine.

We describe the use of Florisil chromatography to purify and fractionate porphyrins into uro-, copro-, and protoporphyrins before their measurement by quantitative fluorometry. Porphyrinogens in fresh urine may be rapidly oxidized to porphyrins by chloranil, or slowly in weakly alkaline solution, before the sample is applied to the Florisil column....

Direct dilution of freshly passed urine with 19 to 99 volumes of an acid-alcohol solution of chloranil (2, 3, 5, 6-tetrachloro-1, 4-benzoquinone) results in rapid and apparently quantitative conversion of porphyrinogen to fluorescing porphyrin. Dilution must be sufficient to yield an essentially colorless solution. Under these conditions, excitatio...

It has been shown that Nicarbazin does not significantly inhibit the porphyrinogenic action of allylisopropylacetamide (AIA) or 3,5 dicarbethoxy 1,4 dihydrocollidine (DDC), even though it diminishes markedly the uterine and egg shell porphyrin content. This is presumably because of tissue specific effects of these compounds, in which Nicarbazin aff...

Iron-57 Mössbauer absorption measurements and computer calculations show the crystalline electric field to be sharply defined in amorphous metals and alloys. Above the Curie point of amorphous rare-earth-iron compounds we observe a well-defined quadrupole splitting, but in the ferromagnetic phase there is no spectroscopic structure. Computer calcul...

Mo¨ssbauer measurements have been performed on sputtered TbFe2, DyFe2, HoFe2 and ErFe2. Neutron diffraction data indicates that sputtered TbFe2 is structurally and magnetically amorphous. At room temperature, sputtered TbFe2 exhibits a Mo¨ssbauer pattern which is interpreted as due to a broad distribution of hyperfine fields. A similar distribution...

Summary An analysis of the data concerning 1371 hospital offspring population in South India does not indicate any evidence that the determination of sex in the sample is not a chance factor. It revealed that the secondary sex-ratio is neither influenced by the degree of the fathers physical labour (rated from the fathers occupation), nor by the ma...