This book highlights some agriculturally important plants and their associated arthropod complexes with a biological, as well as an agricultural, perspective. It discusses how limited knowledge of entomology may be used to enhance management of pest species in cultivated sunflower.
Crystal oscillators have been in use now for well over SO years-one of the first was built by W. G. Cady in 1921. Today, millions of them are made every year, covering a range of frequencies from a few Kilohertz to several hundred Mega hertz and a range of stabilities from a fraction of one percent to a few parts in ten to the thirteenth, with most of them, by far, still in the range of several tens of parts per million.Their major application has long been the stabilization of fre quencies in transmitters and receivers, and indeed, the utilization of the frequency spectrum would be in utter chaos, and the communication systems as we know them today unthinkable,'without crystal oscillators. With the need to accommodate ever increasing numbers of users in a limited spectrum space, this traditional application will continue to grow for the fore seeable future, and ever tighter tolerances will have to be met by an ever larger percentage of these devices.
Can a man be content with a piece of bread and some change tossed his way from a passerby? Today's modern welfare state expects he can. Those who control the money in our society think that giving a dollar at the train station and then appropriating a billion dollars for federal housing can cure the ails of the homeless and the poor. But the crisis of the modern welfare state is more than a crisis of government. Private charities that dispense aid indiscriminately while ignoring the moral and spiritual needs of the poor are also to blame. Like animals in the zoo at feeding time, the needy are given a plate of food but rarely receive the love and time that only a person can give. Poverty fighters 100 years ago were more compassionate--in the literal meaning of "suffering with"--than many of us are now. They opened their own homes to deserted women and children. They offered employment to nomadic men who had abandoned hope and human contact. Most significantly, they made moral demands on recipients of aid. They saw family, work, freedom, and faith as central to our being, not as life-style options. No one was allowed to eat and run. Some kind of honest labor was required of those who needed food or a place to sleep in return. Woodyards next to homeless shelters were as common in the 1890s as liquor stores are in the 1990s. When an able bodied woman sought relief, she was given a seat in the "sewing room" and asked to work on garments given to the helpless poor. To begin where poverty fighters a century ago began, Marvin Olasky emphasizes seven ideas that recent welfare practice has put aside: affiliation, bonding, categorization, discernment, employment, freedom, and most importantly, belief in God. In the end, not much will be accomplished without a spiritual revival that transforms the everyday advice we give and receive, and the way we lead our lives. It's time we realized that there is only so much that public policy can do. That only a richness of spirit can battle a poverty of soul. The century-old question--does any given scheme of help... make great demands on men to give themselves to their brethren?--is still the right one to ask. Most of our 20th-century schemes have failed. It's time to learn from the warm hearts and hard heads of the 19th-century.
Lasers continue to be an amazingly robust field of activity. Anyone seeking a photon source is now confronted with an enormous number of possible lasers and laser wavelengths to choose from, but no single, comprehensive source to help them make that choice. The Handbook of Lasers provides an authoritative compilation of lasers, their properties, and original references in a readily accessible form. Organized by lasing media-solids, liquids, and gases-each section is subdivided into distinct laser types. Each type carries a brief description, followed by tables listing the lasing element or medium, host, lasing transition and wavelength, operating properties, primary literature citations, and, for broadband lasers, reported tuning ranges. The importance and value of the Handbook of Lasers cannot be overstated. Serving as both an archive and as an indicator of emerging trends, it reflects the state of knowledge and development in the field, provides a rapid means of obtaining reference data, and offers a pathway to the literature. It contains data useful for comparison with predictions and for developing models of processes, and may reveal fundamental inconsistencies or conflicts in the data.
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