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- 저자 : Cherukuri (검색결과 5 건)
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Harish P. Cherukuri,Patrick Ulysse,Ronald E. Smelser,Kannan Subramanian,Deepti Kotaru 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Rapid quenching of aluminum extrusions often results in residual stresses and distortion. The out-of-plane normal component of the residual stress is typically very large and results in undesirable bending (bowing) of the extruded shape. Three-dimensional models to predict the residual stresses and bending of extruded thin-walled shapes are difficult to implement since the wall-thicknesses are often very small compared with the axial dimensions. In this paper, a generalized planestrain model is presented to predict the residual stresses and distortion. For illusrative purposes of the model, a Z-shaped extrusion is chosen. The model predicts the bowing of the extruded shape along with the in-plane and out-of-plane stress components. An internal state-variable model is used for the constitutive description. The residual stresses and distortion are studied for cold and warm water quenching and three different cases of spray quenching. The numerical results indicate that cold water quenching and the two spray quenching cases with the higher discharge rates lead to significantly larger residual stresses compared to the remaining two cases. For each case, the out-of-plane bows of the extruded shapes are also shown to be significant.
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Laser generated elastic waves in a semi-infinite domain
Bongsoo Jang,Harish P. Cherukuri 한국산업응용수학회 2007 한국산업응용수학회 학술대회 논문집 Vol.3 No.2
Thermo-elastic waves generated by a pulsed laser in solid is of great interest due to the extensive applications of pulsed laser technologies in material processing and non-destructive detecting(NDT) and characterization. Since wavelength of ultrasonic waves is smaller than the usual size of defect, the method using ultrasonic waves generated by a laser can detect the presence of small defects. Lasers are capable of producing ultrasonic waves very accurately and have an advantage of producing high intensity power and directionality. Thus, the method of a pulsed laser is being commonly used to generate ultrasonic waves for NDT. In this study, one dimensional analytical and numerical investigation of laser generate elastic waves in a semi-infinite solid strap is presented. Assuming uncoupled thermo-elasticity theory, analytic solutions for the thermal and the mechanical equations are obtained by the Laplace transform techniques. Laser interaction with a solid specimen is studied when the optical absorption coefficient varies. A weaker displacement is observed for a large absorption coefficient. Numerical approximated solutions are compared with the analytical solutions.
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Linga Venkateswar Rao,Cherukuri Pavana Jyothi,Reddy Shetty Prakasham,Chaganti Subba Rao,Ponnupalli Nageshwara Sarma,Ravella Sreenivas Rao 한국미생물학회 2006 The journal of microbiology Vol.44 No.1
Candida tropicalis was treated with ultraviolet (UV) rays, and the mutants obtained were screened for xylitol production. One of the mutants, the UV1 produced 0.81g of xylitol per gram of xylose. This was further mutated with N-methyl-N’-nitro-N-nitrosoguanidine (MNNG), and the mutants obtained were screened for xylitol production. One of the mutants (CT-OMV5) produced 0.85g/g of xylitol from xylose. Xylitol production improved to 0.87 g/g of xylose with this strain when the production medium was supplemented with urea. The CT-OMV5 mutant strain differs by 12 tests when compared to the wild-type Candida tropicalis strain. The XR activity was higher in mutant CT-OMV5. The distinct difference between the mutant and wild-type strain is the presence of numerous chlamydospores in the mutant. In this investigation, we have demonstrated that mutagenesis was successful in generating a superior xylitol-producing strain, CT-OMV5, and uncovered distinctive biochemical and physiological characteristics of the wild-type and mutant strain, CT-OMV5.
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Rao Ravella Sreenivas,Jyothi Cherukuri Pavanna,Prakasham Reddy Shetty,Rao Chaganti Subba,Sarma Ponnupalli Nageshwara,Rao Linga Venkateswar The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.1
Candida tropicalis was treated with ultraviolet (UV) rays, and the mutants obtained were screened for xylitol production. One of the mutants, the UV1 produced 0.81g of xylitol per gram of xylose. This was further mutated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), and the mutants obtained were screened for xylitol production. One of the mutants (CT-OMV5) produced 0.85g/g of xylitol from xylose. Xylitol production improved to 0.87 g/g of xylose with this strain when the production medium was supplemented with urea. The CT-OMV5 mutant strain differs by 12 tests when compared to the wild-type Candida tropicalis strain. The XR activity was higher in mutant CT-OMV5. The distinct difference between the mutant and wild-type strain is the presence of numerous chlamvdospores in the mutant. In this investigation, we have demonstrated that mutagenesis was successful in generating a superior xylitol-producing strain, CT-OMV5, and uncovered distinctive biochemical and physiological characteristics of the wild-type and mutant strain, CT-OMV5.
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Planar Biochip System for Combinatorial Electrokinetics
Rajeshwari Taruvai Kalyana Kumar,Kavya Cherukuri,Ridhima Chadha,Victoria Holderby,Shalini Prasad 한국바이오칩학회 2016 BioChip Journal Vol.10 No.2
This study presents a methodology of in- tegrating dielectrophoresis (DEP) and electrorotation (ROT) on to a planar open electrode system platform to combinatorially characterize and separate organic and inorganic micro particles separate We have optimized methods to develop “biochip” prototype device that is easy to fabricate with an electrode geometry that en- ables unique combination of programmed input electri- cal signals that induces DEP and ROT simultaneously for micro-particle separation. We have demonstrated the isolation of target organic/inorganic particles from a heterogeneous sample population using dynamic DEP and ROT induced electric fields. Target particles were effectively separated and simultaneously analyzed for its dielectric properties using dynamic electrode geo- metry. In this study we have successfully shown the separation of two study models with separation effi- ciency of > 96% from heterogeneous mixture of orga- nic (HeLa and HEK cells) and inorganic (polystyrene beads) particles as a proof-of-feasibility suitable for translation research.
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