Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Manish Dixit,Manish Mishra,P.A. Joshi,D.O. Shah 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2

The Mg–Al hydrotalcite (HT) and Mg–Al mixed oxide supported copper catalysts containing 3–3.5 wt.%copper in finely dispersed form were synthesized and characterized. The effect of support nature on physico-chemical and catalytic properties of supported copper species were studied. The loading of copper on the supports was observed to be influencing the surface acidic, basic and reducibility properties, and catalytic behavior in dehydrogenation of benzyl alcohol. The high basicity and intercalated copper ions in Mg–Al hydrotalcite supported copper sample showed multifunctional activity in catalytic transformations of alcohols (primary, secondary and aromatic alcohols).

Novel conducting lithium ferrite/chitosan nanocomposite: Synthesis, characterization, magnetic and dielectric properties

Manish Srivastava,Jay Singh,Rajneesh K. Mishra,Manish K. Singh,Animesh K. Ojha,Madhu Yashpal,Srivastava Sudhanshu 한국물리학회 2014 Current Applied Physics Vol.14 No.7

A study on Lithium ferrite/chitosan nanocomposite (LFCN), easily moldable into arbitrary shapes, as the conducting polymer and ferromagnetic characteristics is presented. The composite material is produced in the presence of Li0.5Cr0.1Fe2.4O4 and Li0.5Co0.1Fe2.4O4 nanoparticle by ex-situ polymerizations process. Various characterizations techniques have been used to explore the characteristic of the synthesized products. The frequency dependent dielectric properties and electrical conductivity of all the samples have been measured through complex impedance plot in the frequency range of 1 kHze6 MHz at room temperature. It was observed that in case of (LFCN), fluctuation in value of (ε 0) and (ε 00) is ceased over the frequency range of 4 Mz which can be attributed to the steady storage and dissipation of energy in the nanocomposite system. Moreover, it is also observed that electrical conductivity of (LFCN) increases with frequency and its value was found to be (0.032e0.048) (ohm-cm)1 in frequency range of 1 kHze6 MHz. Due to its low cost, a simple synthesis process and high flexibility, the proposed LFCN may find applications in various types of electronic components.

Solvent Free N-Heterocyclization of Primary Amines to N-Substituted Azacyclopentanes Using Hydrotalcite as Solid Base Catalyst

Manish Dixit,Manish Mishra,P.A. Joshi,D.O. Shah 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5

An ecofriendly catalytic route for selective synthesis of N-substituted azacyclopentanes, nitrogen-containing heterocyclic intermediates for many bioactive compounds, was established by carrying out N-heterocyclization (di N-alkylation) of primary amines with 1,4-dichloro butane (as dialkylating agent) using catalytic amount of hydrotalcite as solid base catalyst. The hydrotalcite was found to be efficient solid base catalyst for di Nalkylation of different primary amines (aniline, benzyl amine, cyclohexyl amine and n-butyl amine) giving 82 to 96% conversion (at optimized reaction condition) of 1,4-dichloro butane and > 99% selectivity of respective N-substituted azacyclopentanes within 30 min. under solvent free condition. The reaction parameters significantly influence the conversion of 1,4-dichloro butane to N-substituted azacyclopentanes. The nature of substituent present on amino group affects the reactivity of amine substrates for di N-alkylation reaction with 1,4-dichloro butane. The 1,4-dichloro butane was found to be highly reactive alkylating agent for di Nalkylation of amines as compared to 1,4-dihydroxy butane. The reusability of the catalyst and its chemical stability in the reaction was demonstrated.

Tissue engineering in plastic and reconstructive surgery: fostering advances in the 21st century via an understanding of the present state of the art and future possibilities

Manish Anand,Manish Bhagania,Kiranmeet Kaur 대한미용성형외과학회 2023 Archives of Aesthetic Plastic Surgery Vol.29 No.2

Tissue engineering is a subfield of regenerative medicine that has been hailed as the most cutting-edge medical and surgical achievement to date. Tissue engineering aims to restore or construct whole tissues that have been lost due to congenital disabilities, trauma, or surgery. Tissue engineering is based on the premise of obtaining mesenchymal stem cells that can be used to create an embryologically comparable organ. To regenerate an organ that resembles the intended tissue to be replaced, a complex synergistic interplay between stem cells, signaling molecules, and scaffold, is required. Tissue engineering in plastic surgery is expected to reduce surgical morbidity by integrating cell signals or bio-artificial components taken from the patient’s cells, which may replace damaged bodily tissue without the need for extensive reconstructive surgery. With the advent of 3-dimensional printers for modeling scaffolds and current tissue engineering methods for the regeneration of muscle, bone, and cartilage in the laboratory, the scope of tissue engineering is no longer confined to cells and scaffolds, but also encompasses growth factors and cytokines. Although these methods seem promising, clinical success has been limited to essential tissue regeneration, with considerable difficulties remaining to overcome. This paper aims to introduce readers to tissue engineering’s existing breadth, regeneration processes, limits, and prospects.

Solvent Free N-Heterocyclization of Primary Amines to N-Substituted Azacyclopentanes Using Hydrotalcite as Solid Base Catalyst

Dixit, Manish,Mishra, Manish,Joshi, P.A.,Shah, D.O. Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5

An ecofriendly catalytic route for selective synthesis of $N$-substituted azacyclopentanes, nitrogen-containing heterocyclic intermediates for many bioactive compounds, was established by carrying out $N$-heterocyclization (di $N$-alkylation) of primary amines with 1,4-dichloro butane (as dialkylating agent) using catalytic amount of hydrotalcite as solid base catalyst. The hydrotalcite was found to be efficient solid base catalyst for di $N$-alkylation of different primary amines (aniline, benzyl amine, cyclohexyl amine and n-butyl amine) giving 82 to 96% conversion (at optimized reaction condition) of 1,4-dichloro butane and > 99% selectivity of respective $N$-substituted azacyclopentanes within 30 min. under solvent free condition. The reaction parameters significantly influence the conversion of 1,4-dichloro butane to $N$-substituted azacyclopentanes. The nature of substituent present on amino group affects the reactivity of amine substrates for di $N$-alkylation reaction with 1,4-dichloro butane. The 1,4-dichloro butane was found to be highly reactive alkylating agent for di $N$-alkylation of amines as compared to 1,4-dihydroxy butane. The reusability of the catalyst and its chemical stability in the reaction was demonstrated.

Development of wireless Ultrasonic Device

Manish Man Shrestha,Jung-Ryul Lee(이정률) 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

This paper presents the development of Wireless Ultrasonic Device (WUD) for structural health monitoring of aircraft structure. In recent years, large amount of research has been done to utilize the wireless communication method for structural health monitoring. However, majority of the current system has low sampling rate, low data throughput and less secure. In this study, we developed a wireless ultrasonic device that can generate a tone-burst signal, acquire ultrasonic wave at high sampling rate, and send acquired wave using Wi-Fi communication. The device is equipped with high speed microcontroller, Wi-Fi modem, and multiplexer circuit. Furthermore, the device uses the standard communication protocol Transmission Control Protocol/Internet Protocol (TCP/IP) for wireless communication, which make sure that the connection is secure and the data is transmitted without any error. The performance of device was compared with the results obtained through wired connection to prove the integrity of the device.

Mapping AUTOSAR Methodology to COTS-based V-Process Model

Manish Kumar,Jiyong Park,Seongsoo Hong 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

AUTOSAR is an automotive software platform standard created by European automobile manufacturers and their first tier suppliers to standardize software infrastructure. This standard has reached a stage where it can be exploited by the industries. But to exploit the standard, we need a well-defined development process model suited for AUTOSAR. In this paper, we propose a complete software development process model, keeping in mind the existing best practices of the industries. We have also used the COTS-based development since it reduces development time and ensures reliability.

A report on tectonically sculptured unique glacier landform: a case study from the Tethys Kumaun Himalaya, India

Manish Mehta,Rahul Devrani,Khayingshing Luirei,Vinit Kumar 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.2

In the present study, we are reporting an unnamed glacier located (30.28089N- 80.69344E) in the upper Kali Ganga valley, Pithoragarh district, Uttarakhand, India, which has been affected by active fault and climate change. Recent tectonic activity and change in climatic conditions have changed the course and morphology of this glacier. An active fault has produced a fault scarp that measures about 250 m in height with a northerly dip, the fault trace is 6.2 km in length and trend towards NW-SE. The observation is based on the satellite image, toposheet and Google Earth images. We observed that the 5 km long unnamed glacier, which covered ~4 km2 area in Kuthi Yankti valley (Tributary of Kali River) has abruptly changed its main course. The NE moving glacier has been abruptly truncated and forced to move towards SE and ultimately merges with the adjacent glacier named Sumzurkchanki as a result of tectonic forcing. It is one of the unique behaviors of the glacier, which is for the first time reported from the Himalayan glacier as no such observation have so far been reported on this type of glacier kinematics. The study will help to understand the glacial-tectonic interaction and provides key information for future studies.

The C2 Pedicle Width, Pars Length, and Laminar Thickness in Concurrent Ipsilateral Ponticulus Posticus and High-Riding Vertebral Artery: A Radiological Computed Tomography Scan-Based Study

Manish Kundanmal Kothari,Samir Surendranath Dalvie,Santosh Gupta,Agnivesh Tikoo,Deepak Kumar Singh 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.2

Study Design: Retrospective radiological study. Purpose: We aimed to determine the prevalence of ponticulus posticus (PP) and high-riding vertebral artery (HRVA) occurring simultaneously on the same side (PP+HRVA) and in cases of PP+HRVA, to assess C2 radio-anatomical measurements for C2 pars length, pedicle width, and laminar thickness. Overview of Literature: PP and HRVA predispose individuals to vertebral artery injuries during atlantoaxial fixation. In cases of PP+HRVA, the construct options thus become limited. Methods: Consecutive computed tomography scans (n=210) were reviewed for PP and HRVA (defined as an internal height of <2 mm and an isthmus height of <5 mm). In scans with PP+HRVA, we measured the ipsilateral pedicle width, pars length, and laminar thickness and compared them with controls (those without PP or HRVA). Results: PP was present in 14.76% and HRVA in 20% of scans. Of the 420 sides in 210 scans, PP+HRVA was present on 13 sides (seven right and six left). In scans with PP+HRVA, the C2 pars length was shorter compared with controls (13.69 mm in PP+HRVA vs. 20.65 mm in controls, p<0.001). The mean C2 pedicle width was 2.53 mm in scans with PP+HRVA vs. 5.83 mm in controls (p<0.001). The mean laminar thickness was 4.92 and 5.48 mm in scans with PP+HRVA and controls, respectively (p=0.209). Conclusions: The prevalence of PP+HRVA was approximately 3% in the present study. Our data suggest that, in such situations, C2 pedicle width and pars length create important safety limitations for a proposed screw, whereas the translaminar thickness appears safe for a proposed screw.

Minimizing Cipher Text in Homomorphic Encryption Scheme for Cloud Data

Manish M. Potey C. A. Dhote,Deepak H. Sharma 사단법인 인문사회과학기술융합학회 2016 예술인문사회융합멀티미디어논문지 Vol.6 No.8

Cloud data security is major concern in cloud computing. Cloud data security must satisfy the three goals of security in computing - integrity, confidentiality and availability issues. Homomorphic encryption is a technique in which user or cloud service provider (CSP) can perform operations on cloud data without performing decryption. Many algorithms are available for homomorphic encryption. But these algorithms generate large size cipher text. This paper focuses on homomorphic encryption with small size cipher text. The cipher text created here is compared with Paillier encryption scheme and with our earlier approaches. In experimentation of this algorithm data is stored in DynamoDB of Amazon Web service (AWS) public cloud. When user requires data it can be downloaded on users machine and then decrypted. It is observed that it saves 20-40% memory space using this approach.