System and Apparatus for Filtering Particles

A modular pre-filtration apparatus may be beneficial to extend the life of a filter. The apparatus may include an impactor that can collect a first set of particles in the air, and a scroll filter that can collect a second set of particles in the air. A filter may follow the pre-filtration apparatus, thus causing the life of the filter to be increased

System and Apparatus for Filtering Particles

A modular pre-filtration apparatus may be beneficial to extend the life of a filter. The apparatus may include an impactor that can collect a first set of particles in the air, and a scroll filter that can collect a second set of particles in the air. A filter may follow the pre-filtration apparatus, thus causing the life of the filter to be increased

Effect of Localised Pressure Depression and Rain on Aerodynamic Characteristics of MALE UAV

This paper presents the effect of the local low-pressure region in the atmosphere and rain on aerodynamiccharacteristics of medium altitude long endurance unmanned aerial vehicle (MALE-UAV) configuration duringcruise/loiter. Computations are performed using CFD++, a commercial CFD software suite. A large low-pressuredepression past the MALE UAV (symmetrically and asymmetrically) with pressure 10 – 15 % lower than the freestream pressure and a widespread rainfall type with a rainfall rate of 1195 mm/hr., are considered for CFD simulation.A large low pressure that spans the whole MALE-UAV results in a decrement in both lift and drag, but does not affect the yawing and rolling moments significantly. However, a low-pressure region that engulfs only one-half of MALE UAV causes sudden/abrupt changes in rolling and yawing moments. The effect of rain causes a significant decrease in a lift at higher alpha, accompanied by a decrease in stall angle of 2 degrees, and a significant increase in drag. From the study, a Standard Operating Procedure (SOP) was adopted to fly UAVs in adverse weather effects,such that the aircraft can be operated with a velocity higher than 1.3Vstall and at a power setting not less than 75% of max power capacity

Molecular detection of Hepatozoon spp. in domestic cats of Kerala

Vector-borne diseases are an important cause of morbidity and mortality in domestic cat population and hepatozoonosis is one such infection. Incidence of hepatozoonosis has been described in a variety of animal species but information on cats is scarce. To investigate the occurrence of this pathogen in domestic cats, blood samples were collected from domestic cats from three districts of Kerala (Thrissur, Kannur and Wayanad). Field-stained blood smears were examined to detect the presence of gamonts of Hepatozoon spp. and the samples were subjected to molecular analysis by PCR amplification. Out of 122 blood samples screened, none of the sample revealed the presence of gamonts of Hepatozoon on microscopic examination. Polymerase chain reaction targeting 18S rRNA gene of Hepatozoon spp. demonstrated seven positive cases with a prevalence of 5.74 per cent. Results of this study indicate that hepatozoonosis is established within the domestic cats in Kerala and warrant the adoption of control measures

Design and Development of Instrumentation for Active Vibration Control of Smart Aerospace Structures

Active vibration control of aerospace structures using smart concept is one of the potential areas of application, the successful implementation of which requires design, development of instrumentation. electronics, digital signal processing techniques, computers, control system, robust control law, structure with built-in sensors and actuators coupled with good analytical and system identification studies, This paper essentially deals with some of the above issues and requirements. Further, it focuses on the design, development of instrumentation catering to piezos being used as sensors and actuators on the host structure to achieve active vibration control. The implementation of active vibration control for a single channel is explained in detail. The paper concludes with the description of adaptation of the above for multi-channel vibration control

Numerical investigation on the effect of injection pressure on the internal flow characteristics for diethyl ether, dimethyl ether and diesel fuel injectors using CFD

The spray characteristics of the diesel fuel are greatly affected by the cavitation formed inside the injector due to the high pressure differential across the nozzle. Many researchers across the globe are exploring the potential of using diethyl ether and dimethyl ether as an alternate for diesel fuel to meet the strict emission norms. Due to the variation in the fuel properties the internal flow characteristics in injectors for ether fuels are expected to be different from that of the diesel fuel. In this paper computational technique is used to study and compare the internal flow characteristics of diethyl ether, dimethyl ether and diesel fuel. The two phase flow model considering the fuel as a mixture of liquid and vapor is adopted for the simulation study. The injection pressure is varied from 100 to 400 bar and the flow characteristics of all three fuels are simulated and compared. Results indicate that all three fuels have distinct cavitating patterns owing to different property values. The dimethyl ether is found to be more cavitating than diesel and diethyl ether fuels as expected. The mass of fuel injected are found to be decreasing for the ether fuels when compared with diesel fuel at all injection pressures

Isolation and characterization of cholesterol degrading bacteria from soap and vegetable oil industrial waste

508-513The cholesterol degrading bacteria were isolated and characterized from the soap and vegetable oil industrial wastes. Fifteen strains were isolated by the primary screening. Among the fifteen, only three strains were identified as cholesterol oxidase enzyme producers. The morphological and biochemical characters revealed that the isolated microorganisms were Pseudomonas sp., Bacillus sp. and <i style="mso-bidi-font-style: normal">Sterptomyces sp. The isolated microorganisms were grown in a cholesterol medium and their degrading potency of cholesterol was determined by TLC, FTIR and HPLC. The cholesterol oxidase (CHO) extracted from the isolates was partially purified and the molecular mass was determined to be about 55-60 kDa. The optimum pH and temperature for CHO activity of the three isolates was evaluated. The present study revealed that the isolates (Pseudomonas sp., Bacillus sp. and <i style="mso-bidi-font-style: normal">Streptomyces sp.) isolated from the industrial wastes had good cholesterol degrading potential and would be considered as good source of CHO for important medical applications

A Chaotic Quadratic Bistable Hyperjerk System with Hidden Attractors and a Wide Range of Sample Entropy: Impulsive Stabilization

Hidden attractors generated by the interactions of dynamical variables may have no equilibrium point in their basin of attraction. They have grabbed the attention of mathematicians who investigate strange attractors. Besides, quadratic hyperjerk systems are under the magnifying glass of these mathematicians because of their elegant structures. In this paper, a quadratic hyperjerk system is introduced that can generate chaotic attractors. The dynamical behaviors of the oscillator are investigated by plotting their Lyapunov exponents and bifurcation diagrams. The multistability of the hyperjerk system is investigated using the basin of attraction. It is revealed that the system is bistable when one of its attractors is hidden. Besides, the complexity of the systems' attractors is investigated using sample entropy as the complexity feature. It is revealed how changing the parameters can affect the complexity of the systems' time series. In addition, one of the hyperjerk system equilibrium points is stabilized using impulsive control. All real initial conditions become the equilibrium points of the basin of attraction using the stabilizing method.This work is funded by the Center for Nonlinear Systems, Chennai Institute of Technology, India, and under funding number CIT/CNS/2021/RP-015.Scopu

Hidden and Self-Excited Collective Dynamics of a New Multistable Hyper-Jerk System with Unique Equilibrium

Nonlinear dynamical systems with hidden attractors belong to a recent and hot area of research. Such systems can exist in different forms, such as without equilibrium or with a stable equilibrium point. This paper focuses on the dynamics of a new 4D chaotic hyper-jerk system with a unique equilibrium point. It is shown that the new hyper-jerk system effectively exhibits different hidden behaviors, which are hidden point attractor, hidden periodic attractor, and hidden chaotic state. Collective behaviors of the system are studied in terms of the equilibrium point, bifurcation diagrams, phase portraits, frequency spectra, and two-parameter Lyapunov exponents. Some remarkable and exciting properties are found in the new snap system, such as period-doubling transition, asymmetric bubbles, and coexisting bifurcations. Also, we demonstrate that it is possible to generate different varieties of two, three, four, or five coexisting hidden and self-excited attractors in the introduced model. In addition, the amplitude and offset of the hidden chaotic attractors are perfectly controlled for possible application in engineering. Furthermore, a circuit design has been implemented to support the physical feasibility of the proposed model.This work is partially funded by Center for Materials Research, Chennai Institute of Technology, Chennai, India via funding number CIT/CMR/2021/RD/003