Showing papers by "Bharathiar University published in 1990"

Construction and selection of multiple dependent (deferred) state sampling plan

Abstract: Tables have been prepared for the construction and selection of multiple dependent (deferred) state (MDS) sampling plans of type MDS-(c1,c2). These plans are compared with conventional sampling plans (such as single and double sampling) and it is shown that MDS-type plans require a smaller sample size. A special feature of the MDS-(0,1) plan is highlighted and its design procedure is indicated.

Selection of multiple deferred state MDS-1 sampling plans for given acceptable quality level and limiting quality level involving minimum risks

Abstract: A table and a procedure are given for finding the multiple deferred state sampling plan of type MDS-1 involving minimum sum of risks for specified acceptable quality level and limiting quality level.

Analysis of different systems via single-term walsh series method

Abstract: The effectiveness of single term Walsh series method is demonstrated through different types of systems. It is observed that for singular systems the method is more suitable than any other systems.

Analysis of electronic circuits using the single-term Walsh series approach

Abstract: This paper presents a simple method of analysis for a generalized state-space system of electronic circuits using the single-term Walsh series (STWS) approach. The input may conveniently and easily be expanded in STWS. The solution is obtained both in block pulse form and in discrete form. The simple and direct method presented here can easily be implemented with a digital computer.

Aging, Annealing, and Dielectric Properties of Neodymium Oxide Thin Films

Abstract: Thin film capacitors of AlNd2O3Al structure are fabricated by the resistive heating method under a vacuum of 2.66 × 10−3 Pa. The thicknesses of the dielectric films are measured by a multiple beam interferometer. Aging, annealing, and dielectric properties are studied in the frequency range 1 to 30 kHz at various temperatures (303 to 483 K). The capacitance, though dependent on frequency and temperature, is found to be almost constant at room temperature for all frequencies. The relative variations in the capacitance normalized at 10 kHz are characterized. The loss factor, showing a loss peak minimum, increases with the rise of temperature and tan δmin shifts to higher frequencies. The dielectric constant (5.66), the temperature coefficients of capacitance (646 ppm/K) and permittivity (623 ppm/K), and the linear expansion coefficient (23 ppm/K) are evaluted at 1 kHz and at room temperature. From the plot of frequency (tan δmin) versus inverse absolute temperature two activation energies are determined as 0.245 eV and 0.037 eV in the high (>400 K) and low (<400 K) temperature region, respectively. Mittels Widerstandsheizermethode werden im Vakuum von 2,66 × 10−3 Pa Dunnschichtkondensatoren mit AlNd2O3Al-Struktur gefertigt. Die Dicke der dielektrischen Schichten werden mittels Vielstrahlinterferometer gemessen. Alterung, Ausheilung und dielektrische Eigenschaften werden im Frequenzbereich 1 bis 30 kHz bei verschiedenen Temperaturen (303 bis 483 K) untersucht. Es wird gefunden, das die Kapazitat, obwohl frequenz- und temperaturabhangig, bei Zimmertemperaturen fur alle Frequenzen fast konstant ist. Die relativen anderungen der bei 10 kHz normierten Kapazitat werden charakterisiert. Der Verlustfaktor mit einem Minimum, nimmt mit wachsender Temperatur zu und tan δmin verschiebt sich zu hoheren Frequenzen. Die dielektrische Konstante (5,66), die Temperaturkoeffizienten der Kapazitat (646 ppm/K) und Dielektrizitatskonstante (623 ppm/K) und der lineare Ausdehnungskoeffizient (23 ppm/K) werden fur 1 kHz und Zimmertemperatur berechnet. Zwei Aktivierungsenergien werden aus dem Verlauf der Frequenz (tan δmin) uber der reziproken absoluten Temperatur zu 0,245 eV und 0,037 eV im Hoch- (>400 K) bzw. Nieder- (<400 K)-Temperaturbereich bestimmt.

Analysis of nonlinear singular systems via stws method

Abstract: This paper presents a new method for the analysis of nonlinear singular systems of the form K [xdot](t) = A x(t) + f(x(t)) via single-term Walsh series (STWS) approach. Block pulse and discrete solutions are obtained for any length of time. The method is very simple and direct and can easily be implemented on a digital computer

Single Sampling Plans for Variables Indexed by AQL and AOQL

Abstract: Procedures and tables are given for the selection of single sampling plans for variables for given AQL and AOQL, whenever rejected lots are 100% inspected for replacement of nonconforming units...

Construction and Selection of Tightened-Normal-Tightened (TNT) Plans

Abstract: Tables are presented for the design of Tightened-Normal-Tightened (TNT) plans based on different criteria. Conversion from one set of parameters used to fix the OC curve to the other similar set is indicated...

Construction and selection of modified quick switching systems

Abstract: A set of master tables is presented which can be used to select a Modified Quick Switching System. Selection of Modified Quick Switching System indexed by different sets of parameters is discussed.

Vitellogenesis in the gypsy moth, lymantria dispar (L.): Characterization of hemolymph vitellogenin, ovarian weight, follicle growth and vitellin content

Abstract: Summary Gypsy moth vitellin (Vt, greater than 500, 000 daltons) was partially purified from pupal ovarian follicles by high-salt extraction and analyzed by non-SDS- and SDS-PAGE. A large-molecular-weight, female-specific, pupal hemolymph protein (vitellogenin, Vg) had electrophoretic and immuno-staining properties similar to Vt. A slightly larger female-specific hemolymph protein larval-Vt) was found in last-instar female gypsy moth larvae. Vt, pupal-Vg and larval-Vg were recognized on Western blots by a rabbit polyclonal antiserum made against L. dispar Vt. The apoprotein subunits of Vt were 180,000 (apo-Vt180), 165,000 (apo-Vt165), and 38,000 daltons (apo-Vt38). Apo-Vg of similar sizes as the apo-Vt (apo-Vg180, apo-Vg165, and apo-Vg38) were recognized in larval and pupal hemolymph by the anti-Vt antisera. Apo-Vg began to accumulate in the hemolymph of last-instar larvae after day 2 and were not detected by Coomassie-or immuno-staining prior to this time. This indicates that synthesis of Vg must be initi...

Structure, Dielectric, and AC Conduction Studies on Yttrium Fluoride Thin Films

Abstract: Al–YF3–Al (MIM) capacitors are formed by thermal evaporation under a vacuum of 2.66 × 10−3 Pa. The thickness of the dielectric film (YF3) is measured by MBI. From X-ray diffraction studies, the structure of the film is found to be amorphous in nature. Aging, annealing, dielectric, and ac conduction studies are made for these films. It is observed that due to aging the capacitance becomes constant after about 25 days and it decreases with repeated annealing cycles. The dielectric constant for a film of thickness 136 nm at 1 kHz and at room temperature is found to be 13.58. AC conduction studies reveal that the conduction mechanism is electronic hopping. The activation energy is estimated from the slope of conductivity versus inverse absolute temperature plot to 0.509 eV. Mittels thermischer Verdampfung in einem Vakuum von 2,66 × 10−3 werden Al–YF3–Al (MIM)-Kondensatoren hergestellt. Die Dicke der dielektrischen Schicht (XF3) wird mittels MBI gemessen. Rontgenbeugungsuntersuchungen ergeben, das die Struktur der Schichten amorph ist. An den Schichten werden Alterungs-, Temperaungs-, Dielektrizitats- und Wechselleitfahigkeitsuntersuchungen durchgefuhrt. Es wird beobachtet, das infolge der Alterung die Kapazitat nach etwa 25 Tagen konstant wird und mit wiederholten Temperungszyklen abnimmt. Die Dielektrizitatskonstante fur eine Schicht der Dicke 136 nm bei 1 kHz und Zimmertemperatur betragt 13.58. Wechselspannungsleitfahigkeitsuntersuchungen zeigen, das Elektronenhopping als Leitfahigkeitsmechanismus vorliegt. Aus dem Anstieg der Leitfahigkeit uber der inversen absoluten Temperatur wird die Aktivierungsenergie zu 0,509 eV bestimmt.

An existence theorem for a volterra integral equation with deviating arguments

Abstract: An existence theorem is proved for a nonlinear Volterra integral equation with deviating arguments.

Ruthenium(II) and Rhodium(I) Complexes with Some Nitrogen-Sulphur donor Ligands and Triphenylphosphine

Abstract: Several new hexa-coordinated ruthenium(II) and penta-coordinated rhodium(I) complexes of the types [RuX(CO)(LL)(PP3)2] (X=H, Cl, [Rh(CO)(LL)(PPh3)2] and [Rh(LL)(PPh3)3] [where LL = RHN-N=CSSR′ (R=H, R′=CH3; R=R′ =COC6H5) and RR′C=NN=CSSCH3 (R=CH3, R′=C6H5; R=R′=C6H5)] have been synthesised. S-Methyl-dithiocarbazate and S-benzoyl- β -(N-benzoyl)dithiocarbazate in alkaline medium and the Schiff bases in neutral medium deprotonate and behave as a uninegative bidentate sulphur-nitrogen (NS−) chelating ligands. All the new complexes obtained have been characterised on the basis of their analytical and spectroscopic data.

Selection of ChSP-1 chain sampling plans for given acceptable quality level and limiting quality level

Abstract: Procedures and tables are given for the selection of chain sampling plans of type ChSP-1 for given acceptable quality level, producer's risk, limiting quality level and consumer's risk. Selection of ChSP-1 plan is discussed for both proportion nonconforming and the number of nonconformities per unit.

A generalized procedure for selection of attribute double sampling plan

Abstract: A compact table, yielding attribute double sampling plan indexed by AQL, AOQL and LQL and double sampling scheme indexed by AQL is presented. Method of selecting the plans are indicated through examples.

On a volterra integral equation with deviating arguments

Abstract: We prove an existence theorem for nonlinear Volterra integral equation with deviating arguments without assuming the Lipschitz condition.

Certain observations on lot sensitive sampling plan

Abstract: This paper compares the sample size efficiency of the lot sensitive plan over the equivalent double and multiple sampling plans. It is shown that a fully curtailed lot sensitive plan will involve smaller average sample number than the equivalent double and multiple plans.

Existence of solution for nonlinear Volterra integral equations

Abstract: The theory of nonlinear Volterra integral equations with deviating arguments and functional integral equations have been studied by many authors [1, 2, 5, 7]~ Banag[4] has proved an existence theorem for functional integral equation and Balachandran[1] has proved an existence theorem for a nonlinear Volterra integral equation with deviating argument. In this paper we shall derive a set of sufficient conditions for the existence of a solution of nonlinear Volterra integral equations with the kernel containing a continuous operator.

Female accessory glands and sperm reception in Tingidae (Heteroptera).

Abstract: Studies on the anatomy of the female internal organs of reproduction and the intromittent organs of 34 species of Tingidae confirm the absence of spermathecae. The accessory glands are vesicular and primitively unpaired. There is no vermiform gland and the term pseudosperrnatheca, introduced by Carayon in heteropteran literature, is a misnomer. The lateral oviduct and all the 7 pedicels of each ovary develop a permanent swelling in the middle that receive the spermatozoa, syringed into them through the minute pores of the armature of ejaculatory pouches of the endotheca, when it is lodged inside the bursa during copulation. The ejaculatory pouch and the bursa are so designed and adjusted for the purpose of sperm transmission. In a few species of Tingidae a median diverticulum that arises from the endotheca plugs the unpaired vesicular accessory gland, preventing wrongful lodging of the ejaculatory pouch and such a mechanism, not known so far, has been described as a unique feature. A scheme to trace the evolution of accessory gland, from a median unpaired contacaderine condition, to a paired independent gland, having its opening either in front or behind the lateral oviduct, has been detailed.