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- 저자 : Kalra, Mannudeep K. (검색결과 50 건)
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Controlling Nanoparticle Location via Confined Assembly in Electrospun Block Copolymer Nanofibers
Kalra, Vibha,Lee, Jinwoo,Lee, Jung Hun,Lee, Seung Goo,Marquez, Manuel,Wiesner, Ulrich,Joo, Yong Lak WILEY-VCH Verlag 2008 Small Vol.4 No.11
<P>Coaxial nanofibers with poly(styrene-block-isoprene) (PS-b-PI)/magnetite nanoparticles as core and silica as shell are fabricated using electrospinning.1–4 Thermally stable silica helps to anneal the fibers above the glass transition temperature of PS-b-PI and form ordered nanocomposite morphologies. Monodisperse magnetite nanoparticles (NPs; 4 nm) are synthesized and surface coated with oleic acid to provide marginal selectivity towards an isoprene domain. When 4 wt% nanoparticles are added to symmetric PS-b-PI, transmission electron microscopy (TEM) images of microtomed electrospun fibers reveal that NPs are uniformly dispersed only in the PI domain, and that the confined lamellar assembly in the form of alternate concentric rings of PS and PI is preserved. For 10 wt% NPs, a morphology transition is seen from concentric rings to a co-continuous phase with NPs again uniformly dispersed in the PI domains. No aggregates or loss of PI selectivity is found in spite of interparticle attraction. Magnetic properties are measured using a superconducting quantum interference device (SQUID) magnetometer and all nanocomposite fiber samples exhibit superparamagnetic behavior.</P> <B>Graphic Abstract</B> <P>The first ever tailored nanofibers with internal confined assembly used as a template to guide nanoparticles are fabricated. The figure shows cross sections of nanofibers with magnetite nanoparticles dispersed in poly(styrene-b-isoprene). The nanoparticles (dark dots) preferentially wet the isoprene domain (dark regions) due to specific surface chemistry. Scale bar is 200 nm. <img src='wiley_img/16136810-2008-4-11-SMLL200800279-content.gif' alt='wiley_img/16136810-2008-4-11-SMLL200800279-content'> </P>
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Rotor Material Selection for High-Speed Double Cage Solid Rotor Induction Motor
Kalra Sarika 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
This paper presents the effect of various materials on the performance of a 3-phase, 180 kW, 170 Hz, high-speed double cage solid rotor induction motor using ANSYS MAXWELL 2-D software. The double cage rotor has been simulated with different materials for the upper cage and lower cage. It has been observed that in the double cage rotor, both lower cage and upper cage of aluminum is a better choice because it furnishes the large starting torque, lower torque ripple and more value of average torque in comparison to case when lower cage is of copper material and upper cage is of aluminum. The effect of different types of rotor core materials and end ring materials on motor performance has also been analyzed and the material, M19_24G, has been found an improved choice compared to other rotor core materials owing to production of higher average torque with lower value of torque ripple. For end ring material, BeCu, has been discovered the better choice because it renders the highest starting torque and better power factor without compromising the mechanical strength of the motor.
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Kalra Akash,Afzal Munshi Naser Ibne 경희대학교 글로벌 통상·금융연구원 2023 International Trade, Politics and Development Vol.7 No.3
For many global firms and corporate oligopolies, transfer pricing is essential. The transfer pricing literature as it is currently written is succinctly summarized in this study. The authors offer a thorough analysis of transfer pricing research in this study. This review sheds light on the top researchers, approaches, conclusions, theoretical and empirical gaps, and upcoming issues of transfer pricing research over the previous nine years through a methodical analysis of 29 research publications from the Scopus database (2014–2022). To help graduate students pursue further degrees in this area, such as a master's, thesis or PhD, this study will highlight five research issues.This essay looks at five significant areas of tax avoidance and transfer pricing research. Some of these issues include determining the impact of transfer pricing regulations on various types of multinational corporations, assessing the effectiveness of transfer pricing regulations in preventing tax evasion, examining various policy options and determining the impact of transfer pricing on other economic outcomes using a systematic literature review.The findings of this review demonstrate the need for transfer pricing research to look more closely at transfer pricing as a tool for business in addition to compliance and tax management.This analysis concludes with future directions for transfer pricing research.
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The Case for Science Diplomacy in Mongol Eurasia
Kalra Prajakti 한양대학교 아태지역연구센터 2023 Journal of Eurasian Studies Vol.14 No.1
This paper considers the concept of science diplomacy in the context of Eurasian history with a particular focus on the period of the Mongol Empire in the 13th century. The Mongol Empire held sway over much of Eurasia and thus participated in diplomatic activity within and outside of Mongol domains. Scientists and intellectuals routinely headed diplomatic embassies sent and received by the Mongol Empire. Diplomats were valued for their knowledge and skills and served as interlocutors and translators for the Mongol Khans. These scientist-diplomats were key figures in the court and were essential in facilitating exchanges, building connections and fostering relations. As polyglots and polymaths they were able to operate in a multi-cultural environment. They were part of the complex framework of the Mongol Empire that brought to bear a kind of Eurasian development model that relied on expertise, knowledge and resources that could be utilised across the empire. Set within this context, the paper describes the creation of a politico-science complex in Mongol Eurasia with a special emphasis on the relationship between the Mongol Khans and their partners, chief among them were scientists and intellectuals. The Mongol Empire as an empire built upon exchanges summarises how scientific exchanges were both a product of and a driver for diplomatic relations in this period. Thus, the historical connection between diplomacy and science in Eurasia is a necessary component in understanding the modern notion of science diplomacy beyond a European context and applied more globally both in terms of time and space.
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Kalra, Namita,Sabherwal, Puja,Tyagi, Rishi,Khatri, Amit,Srivastava, Shruti The Korean Dental Society of Anesthsiology 2021 Journal of Dental Anesthesia and Pain Medicine Vol.21 No.2
Background: This study assessed anticipatory dental anxiety levels among 8- to 12-year-old children based on subjective and physiological measures and their correlation. The variations in anxiety based on sex, age, temperament, and academic performance were evaluated. Methods: An observational study was conducted in 60 children recruited from the waiting room over a 6-month period. The operator recorded subjective anxiety in the children using a novel visual facial anxiety scale. The operator also noted the demographic details and child's temperament using the nine dimensions of the Thomas and Chess criteria, and graded children as "easy," "slow to warm-up," and "difficult." The academic performance of the children was graded (parental ratings) on a five-point Likert scale. Physiological variables (heartrate [HR], oxygen saturation[SpO2], and blood pressure [BP]) were recorded by another evaluator. The correlation between anxiety levels and physiological variables was also assessed. The effects of age, sex, temperament, and academic performance on anxiety were evaluated. Results: The study included 60 children aged 8-12 years, including 36 boys and 24 girls. Seventy percent of children had mild to moderate levels of pre-extraction anxiety, while 30% of children demonstrated high anxiety. A significant positive correlation was noted between anxiety levels and HR (rs = 0.477, P < 0.001⁎) and systolic BP (rs = 0.294, P < 0.05), while a significant but inverse correlation was observed with SpO2 (rs = -0.40, P < 0.05). Anxiety did not influence diastolic BP. Children with difficult temperament and poor academic performance had significantly higher anxiety. Conclusion: A high percentage (70%) of children aged 8-12 years had mild to moderate anxiety prior to the extraction procedure. Increased HR, systolic BP, and reduced SpO2 were significantly associated with high levels of anticipatory dental anxiety. Pre-extraction anxiety was significantly related to the temperament and scholastic performance.
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Pawan Kalra,Ramesh Nadiger,Farhan Khalid Shah 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.2
PURPOSE Study was conducted to determine and assess the effect of different type of denture adhesives on the incisal bite force of complete denture wearers until the dislodgement of upper denture, using pressure transducer. MATERIALS AND METHODS 30 patients out of 100 were included in the study. Based on the Kapur's method of scoring denture retention and stability, these patients were divided into 3 groups- Group A - Clinically good dentures; Group B - Clinically fair dentures; and Group C - Clinically poor dentures. A custom made occlusal force meter was constructed based on the load cell type of pressure transducers. Different adhesives (powder, paste and adhesive strips) were used in the study. Complete denture wearers were asked to bite on the load cell and the readings of incisal bite force were recorded. The readings of incisal bite force were subjected to statistical analysis using Repeated measures ANOVA followed by post-hoc bonferroni test. RESULTS The result suggests that denture adhesives improved the incisal bite force of complete denture wearers significantly The incisal bite force (in kg) in Group A without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 2.48 (± 0.16), 3.43 (± 0.11), 6.01 (± 0.11), 3.22 (± 0.09) respectively. The incisal bite force (in kg) in Group B without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 1.87 (± 0.18), 3.35 (± 0.14), 5.34 (± 0.18), 3.21 (± 0.12) respectively. The incisal bite force (in kg) in Group C without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 1.00 (± 0.17), 3.07 (± 0.14), 4.37 (± 0.26), 2.99 (± 0.14) respectively. CONCLUSION Within the limitations of the study, it was concluded that the use of denture adhesive was found to be significantly effective in improving the incisal bite force of complete dentures until the dislodgement of upper denture. Fittydent paste adhesive was found to be more effective than the powder and strips adhesives. The improvement in incisal bite force was found to be higher in Group C in comparison to that of Group A and Group B.
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Metastatic carcinoma of cervix mimicking psoas abscess on imaging: a case report
Naveen Kalra,Senthilkumar Aiyappan,Raje Nijhawan,S.C. Sharma,Niranjan Khandelwal 대한부인종양학회 2009 Journal of Gynecologic Oncology Vol.20 No.2
Cervical cancer can be presented as an unusual and aggressive manner in human immunodeficiency virus (HIV)- positive women. There are case reports of psoas abscess which mimick metastasis from cervical carcinoma in HIV-positive patients. However, such cases are very rare in HIV-negative women with only few case reports available in the literature. We report one case of psoas abscess mimicking metastasis in a HIV-negative woman, which was initially diagnosed as spinal tuberculosis. Cervical cancer can be presented as an unusual and aggressive manner in human immunodeficiency virus (HIV)- positive women. There are case reports of psoas abscess which mimick metastasis from cervical carcinoma in HIV-positive patients. However, such cases are very rare in HIV-negative women with only few case reports available in the literature. We report one case of psoas abscess mimicking metastasis in a HIV-negative woman, which was initially diagnosed as spinal tuberculosis.
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