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This book opens the way to a deeper knowledge of mahamudra, a Buddhist system of meditation on the nature of the mind. In providing a detailed commentary on the Vajra Song of the first Jamgo n Kongtru l (1813- 1899), the author elucidates the stages of ground, path, and fruition for those who wish to meditate according to this system.
Includes an excerpt from The promise of Jesse Woods by Chris Fabry.
A charming and engrossing novel for fans of Southern fiction and the recent hit memoir Hillbilly Elegy about a lush and storied coal-mining town—and the good people who live there—in danger of being destroyed for the sake of profit. Will the truth about the town’s past be its final undoing or its saving grace? 1933. In the mining town of Beulah Mountain, West Virginia, two young girls form an unbreakable bond against the lush Appalachian landscape, coal dust and old hymns filling their lungs and hearts. Despite the polarizing forces of their fathers—one a mine owner, one a disgruntled miner —Ruby and Bean thrive under the tender care of Bean’s mama, blissfully unaware of the rising conflict in town and the coming tragedy that will tear them apart forever. 2004. Hollis Beasley is taking his last stand. Neighbors up and down the hollow have sold their land to Coleman Coal and Energy, but Hollis is determined to hold on to his family legacy on Beulah Mountain. Standing in his way is Buddy Coleman, an upstart mining executive who hopes to revitalize the dying town by increasing coal production and opening the Company Store Museum. He’ll pay homage to the past—even the massacre of 1933—while positioning the company for growth at all costs. What surprises them all is how their stories will intersect with a feisty octogenarian living hundreds of miles away. When Ruby Handley Freeman’s grown children threaten her independence, she takes a stand of her own and disappears, propelling her on a journey to face a decades-old secret that will change everything for her and those she meets.
The sun radiates a tremendous amount of energy, called solar energy or solar radiation, which is the main natural source of energy on the Earth, by far. Because solar radiation is the almost unique supplier of energy to the Earth, it has a primary influence on life and activities on the Earth. The climate is a first example, but there are many others, such as plant growth or human health, or even the design of buildings, the production of energy, notably electrical and thermal, or even aging materials. This book aims to provide simple answers to anyone who has questions about solar radiation. Its ambition is to help by presenting the fundamental elements of the solar radiation received on the ground. The book includes many examples and numerous illustrations, as well as some simple but fairly precise equations to calculate the various elements covered and to reproduce the figures and graphs. The first of the three parts of this book is devoted to the relative geometry between the direction of the sun and an observer on the ground as well as to the solar radiation emitted by the sun and received at the top of the atmosphere. The orbit of the Earth around the sun and the solar declination are described. The concept of time is introduced which is closely linked to the solar cycle and the rotation of the Earth on itself. Equations are given to calculate the solar radiation received on a horizontal or inclined surface located at the top of the atmosphere. The spectral distribution of the extraterrestrial solar radiation is described. The second part of this book addresses how the solar radiation incident at the top of the atmosphere is attenuated and modified in its downward path to the ground. The reflection of the radiation by the ground is presented. The solar radiation received on the ground by a horizontal or inclined collector plane, such as a natural slope or a rooftop, is discussed, as well as its spectral distribution. The variability of the radiation is addressed in relation to the properties of solar radiation estimated from the measurements. The third part deals with direct or indirect measurements of the solar radiation received on the ground over a given integration time (minute, hour, day, or month), whether for total radiation or radiation in a spectral range such as ultraviolet (UV), or daylight, or photosynthetically active radiation (PAR). It also explains how to check the plausibility of the measurements. Fundamentals of Solar Radiation will be a valuable resource to all professionals, engineers, researchers, students, and other practitioners that seek an understanding of solar radiation.
Radiative heat transfer is a fundamental factor in the energetics of the terrestrial atmosphere: the system consisting of the atmosphere and the underlying layer is heated by the Sun, and this heating is compensated, on the average, by thermal radia tion. Only over a period of 1-3 days from some specified initial moment can the dynamic processes in the atmosphere be considered to be adiabatic. Global dynamic processes of long duration are regulated by the actual influxes of heat, one of the main ones being the radiative influx. Radiation must be taken into account in long-term, weather forecasting and when considering the global circulation of the atmosphere, the theory of climate, etc. Thus it is necessary to know the albedo of the system, the amount of solar radiation transmitted by the atmosphere, the absorptivity of the atmosphere vis-a-vis solar radiation, and also the effective radiation flux, the divergence of which represents the radiative cooling or heating. All these quantities have to be integrated over the wavelength spectrum of the solar or thermal radiation, and they must be ascertained as functions of the determining factors. The relation ships between the indicated radiation characteristics, the optical quantities directly determining them, the optically active compo nents of the atmosphere, and the meteorological fields will be discussed in this book.
This handbook opens with an overview of solar radiation and how its energy can be tapped using photovoltaic cells. Other chapters cover the technology, manufacture and application of PV cells in real situations. The book ends by exploring the economic and business aspects of PV systems.