Dr Rajiv Desai

An Educational Blog

5G

5G ___ ___ Prologue: Today’s wireless networks have run into a problem: More people and devices are consuming more data than ever before, but it remains crammed on the same bands of the radio-frequency spectrum that mobile providers have always used. That means less bandwidth for everyone, causing slower service and more dropped connections. The rapid increase of mobile data growth and the use of smartphones are creating unprecedented challenges for wireless service providers to overcome a global bandwidth shortage. As today’s cellular providers attempt to deliver high quality, low latency video and multimedia applications for wireless devices, they are limited to a carrier frequency spectrum ranging between 700 MHz and 2.6 GHz. Carrier frequency is the basic operative frequency of radio wave that carries information (voice, video, data) from one place to another place by modulation. A modulated carrier radio wave, carrying an information signal, occupies a range of […]

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POPULATION PROBLEM

Population Problem: _ _ Prologue: In an interview given to Economic Times, JRD Tata had reminisced how Nehru once retorted to his concerns on rising population. “Nonsense, a large population is the greatest source of power of any nation,” the first prime minister of Independent India is believed to have told the industry doyen. Subsequently India’s bulging population was seen as threat to the country’s future so much so that Nehru’s grandson, Sanjay Gandhi, ran a controversial campaign of forced sterilization during the emergency (1975-77). Their present Prime Minister Narendra Modi red-flagged population explosion in the course of his Independence Day speech. Mainstream politicians, journalists, and academics frequently avoid discussing population issues since notions about population are often seen as being politically or ideologically motivated. As a result, population debates are generally argued from the fringes. Some groups characterize population growth as a Ponzi scheme, whereby increasing numbers of youth […]

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DRUG ADDICTION

Drug Addiction: _ Intravenous injection of heroin typically causes a rush within seven to eight seconds. This method of drug use provides the highest intensity and quickest onset of the initial rush but is also the most dangerous. Also, approximately 10% of new HIV infections worldwide are attributable to injecting drug use, often of an opiate such as heroin. ______ Prologue: Drugs are fascinating because they change our awareness. The basic reason people take drugs is to vary their conscious experience. Seeking pleasure is a human trait and certain chemicals which give a feeling of high or pleasure have always been used by some people everywhere. Of course, there are many ways to alter consciousness, such as listening to music, dancing, exercising, day dreaming and participating in religious rituals etc. and the list suggests that changing consciousness is something people like to do. People use substances (drugs) to alter their […]

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SCIENCE OF MUSIC

Science of Music: _____ “Happy Birthday, Mr. President” is a song sung by actress and singer Marilyn Monroe on May 19, 1962, for President John F. Kennedy at a celebration of his 45th birthday, 10 days before the actual date (May 29). The event marked one of Monroe’s final public appearances; she was found dead in August 1962 at the age of 36, and JFK was assassinated the following year. _____ Prologue: The fascinating thing about music is that technically- in a very literal way- it doesn’t exist. A painting, a sculpture or a photograph can physically exist, while music is just air hitting the eardrum in a slightly different way than it would randomly. Somehow that air- which has almost no substance whatsoever- when vibrated and when made to hit the eardrum in tiny subtle ways- can make people dance, love, cry, enjoy, move across country, go to war […]

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VULNERABLE PLAQUE

Vulnerable Plaque: ____ ____ Prologue: Worldwide more than 17 million people die every year from cardiovascular disease (CVD) with this number projected to increase to over 23 million by 2030. The vast majority of acute ischemic vascular events occur in relation to an underlying atherosclerotic plaque. Atherosclerotic plaque represents the hallmark lesion of atherosclerosis. Plaque rupture is the dominant initiating event, responsible for 60–70% of acute coronary syndromes (ACS), while plaque erosion is responsible for most of the remainder. Irrespective of the mechanism, the consequence is exposure of a thrombogenic substrate to circulating blood. This in turn triggers platelet aggregation and the coagulation cascade which compromises vascular blood flow resulting in downstream end-organ ischemia and infarction. These events occur abruptly and often without warning. Despite major advances in treatment of coronary artery disease patients, a large number of victims of the disease who are apparently healthy die suddenly without prior […]

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