A Quantum Optical Spring

We study the dynamics of the quantum optical spring, i.e., a spring whose spring constant undergoes discreet jumps depending on the quantum state of another system. We show the existence of revivals and fractional revivals in the quantum dynamics reminiscent of similar dynamical features in cavity QED. We recover in the semi classical limit the results for an oscillator whose frequency undergoes a sudden change. The quantum optical spring is conceivable for example by a micromirror under the influence of radiation pressure by a field which is strictly quantum. Our work suggests that driven systems would in general exhibit a very different dynamics if the drive is replaced by a quantum source.Comment: 5 figure

Characterization of Nanomaterials for Thermal Management of Electronics

Recently, there has been a growing interest in flexible electronic devices as they are light, highly flexible, robust, and use less expensive substrate materials. Such devices are affected by thermal management issues that can reduce the device’s performance and reliability. Therefore, this work is focused on the study of the thermal properties of nanomaterials and the methods to address such issues. The goal is to enhance the effective thermal conductivity by adding nanomaterials to the polymer matrix or by structural modification of nanomaterials. The thermal conductivity of copper nanowire/polydimethylsiloxane and copper nanowire/polyurethane composites were measured and showed more than threefold enhancement compared to the thermal conductivity values of the neat polymers. Furthermore, identical heat sources were used on the neat polymer as well as the composite samples, and the resulting thermal images were taken, which showed that the resulting hot spot was significantly less severe for the composite sample, demonstrating the potential of copper nanowire/polymer composite as a substrate for flexible electronics with better heat spreading capability. In addition, the thermal properties of cellulose nanocrystals-poly (vinyl alcohol) composite films with different structural configurations of cellulose nanocrystals (such as isotropic and anisotropic configurations) were investigated as an alternative to commonly used petroleum-based materials for potential application in the thermal management of flexible electronic devices. Also, the in-plane thermal conductivity of the anisotropic composite film was as high as ~ 3.45 W m-1 K-1 in the chain direction. Moreover, the composite films showed ~ 4-14 fold higher in-plane thermal conductivity than most polymeric materials used as substrates for flexible electronics. A high degree of cellulose nanocrystal orientation and the inclusion of poly (vinyl alcohol) were the reasons for such improvements. In addition, thermal images showed that the cellulose nanocrystals-poly (vinyl alcohol) composite films had better heat dissipation capability compared to the neat poly (vinyl alcohol) films, indicating its potential application for flexible electronic devices. In another study, thermal properties of nanodiamond films obtained through a solution-based directed covalent assembly were studied as a low-cost and greener alternative to the nanodiamond films grown via chemical vapor deposition method for thermal management of electronics. The results obtained showed cross-plane thermal conductivity as high as 3.50 +/- 0.54 W m-1 K-1 for nanodiamond film of 139.1 +/- 19.5 nm thick. Such a low cross-plane thermal conductivity value can be attributed to higher porosity and poor interface quality compared to that of the nanodiamond films grown via chemical vapor deposition method. Hence, there is still more room for improvement for such nanodiamond films. The above chapters were focused on the study of the thermal properties of various types of nanomaterials for thermal management of electronic devices. In the next chapter, a technique for the fabrication of a device, that is capable of performing characterization nanomaterials was presented. In this work, suspended beam microdevices for electrothermal characterization of nanomaterials were fabricated through a standard photolithography technique that is less time-consuming, less expensive and much simpler than the methods used by other research groups in the past. The agreement of the measured in-plane thermal conductivity of the suspended central silicon nitride bare bridge with the literature validated the microdevice, setup, and the experimental procedure. Furthermore, these microdevices can be used to measure other important thermoelectric properties of nanomaterials such as the Seebeck coefficient, electrical conductivity, and thermoelectric figure of merit

VALVULAR HEART DISEASES: AN INSIGHT THROUGH AYURVEDA

Cardiovascular diseases have a large share amongst non-communicable diseases. Valvular heart diseases constitute a significant part of cardiovascular diseases which cause morbidity and mortality in India. India is currently heading towards becoming a heart disease capital of world. This puts a tremendous pressure on available resources of medical and surgical management. Thus, it would be a great asset if these diseases could be managed through traditional systems of medicine like Ayurveda, which would prove to be a good conventional treatment and prevent the development of complications and need for surgery. This article aims at understanding of VHD (Valvular heart diseases) through an Ayurvedic perspective and critically analyzes the treatment options in Ayurveda. It is noticed that though no single disease can be directly correlated to VHD, many of the clinical features of Hrida roga mentioned in Ayurvedic classics are similar to that of VHD and can be adequately managed by classical herbs and formulations

CRITICAL ANALYSIS OF CHILDHOOD SANSKARAS (SACRAMENTS) IN LIGHT OF CONTEMPORARY SCIENCE

India has a rich cultural heritage which affects the life of a person at all stages of life. Hinduism is one of the oldest world religions prevailing in Indian subcontinent. Hindu mythology describes various Sanskaras (sacraments/religious rites) outlined from birth to death of an individual. Out of the sixteen Sanskaras described, eight are for children. These are Jata Karma (birth rites), Namakaran (naming), Nishkraman (taking baby out of home), Annaprashan (starting solid feeding), Chudakarma (head shaving), Karnavedhana (piercing of the ear), Upanayan (thread ceremony) and Vedarambha (start of formal education). This article analyzed these Sanskaras in detail and gives a critical approach to their relevance in light of modern scientific knowledge. Though primarily considered as religious rites, they were significant in context of child health and provided opportunity for routine examination of child at regular intervals. Sanskara prepares one for the next stage of growth. A thorough review of childhood Sanskaras revealed that they were aimed at preparing the baby for extra uterine life successfully, developed proper feeding habits, ensured adequate nutrition, prevented diseases, adapted baby to environment for further survival, gave individual identity and educated the child. It took care of not only physical but also mental, social and spiritual development of child, thus made him a responsible youth of good character who proved to be an asset to the society. These sanskaras are apt till date and worth practicing in todays era

VEDANADHYAYA: A CRUCIAL CONTRIBUTION OF KASHYAP SAMHITA IN PEDIATRIC CLINICAL EXAMINATION

The field of Ayurveda is broadly divided into eight parts. Kaumarbhritya refers to the science of diseases and care of children, right from conception till adolescence. Kashyap samhita is undoubtedly the pioneer text in this branch of Ayurveda. The text is divided in various sections (sthanas) of which Vedanadhyaya is twenty fifth chapter in Sutra sthana. It concerns the symptomalogy of various diseases in children and serves as a great guidance for pediatric examination and diagnosis as children are unable to narrate their symptoms themselves. The present article reviews the original text of the chapter and critically analyses it in light of contemporary medical science. It is noticeable that Acharya Kashyap has included a wide range of diseases pertaining to various systems like skin, ENT, gastro-biliary, hematology and urinary system and has also included the Bal grahas. The symptoms described are accurate and reasonable in contemporary scientific era also. Thus, a thorough study of Vedanadhyaya is essential for proper understanding of Ayurvedic perspective of pediatric illness and their common demarcating symptoms. It reinforces the view that children are not miniature adults and diseases in pediatric population have distinct features and need to be understood separately.

Data-driven Job Search Engine Using Skills and Company Attribute Filters

According to a report online, more than 200 million unique users search for jobs online every month. This incredibly large and fast growing demand has enticed software giants such as Google and Facebook to enter this space, which was previously dominated by companies such as LinkedIn, Indeed and CareerBuilder. Recently, Google released their "AI-powered Jobs Search Engine", "Google For Jobs" while Facebook released "Facebook Jobs" within their platform. These current job search engines and platforms allow users to search for jobs based on general narrow filters such as job title, date posted, experience level, company and salary. However, they have severely limited filters relating to skill sets such as C++, Python, and Java and company related attributes such as employee size, revenue, technographics and micro-industries. These specialized filters can help applicants and companies connect at a very personalized, relevant and deeper level. In this paper we present a framework that provides an end-to-end "Data-driven Jobs Search Engine". In addition, users can also receive potential contacts of recruiters and senior positions for connection and networking opportunities. The high level implementation of the framework is described as follows: 1) Collect job postings data in the United States, 2) Extract meaningful tokens from the postings data using ETL pipelines, 3) Normalize the data set to link company names to their specific company websites, 4) Extract and ranking the skill sets, 5) Link the company names and websites to their respective company level attributes with the EVERSTRING Company API, 6) Run user-specific search queries on the database to identify relevant job postings and 7) Rank the job search results. This framework offers a highly customizable and highly targeted search experience for end users.Comment: 8 pages, 10 figures, ICDM 201