Широкое развитие исследований в гидробиологии, ихтио-логии, рыбоводстве, санитарной гидробиологии и водной токсикологии побуждает исследователей обращать особое внимание на химизм природных вод, на их изменяемость в течение года и за ряд лет, на влияние промышленных стоков и применяемых пестицидов в сельском хозяйстве. Природная вода имеет слож-ныи сос.тзв, компоненты которого количественно изменяются от многих причин.
Биологические процессы, протекающие в водоеме, в значительной степени зависят от химизма воды. Каждый гидро-бионт приспосабливается и приспособлен к определенной конкретной среде, изменения которой всегда приводят к изменениям в биоценозах и количественном соотношении численности между видами. <...>

The advent of accessible student computing packages has meant that geophysics students can now easily manipulate datasets and gain first-hand modeling experience – essential in developing an intuitive understanding of the physics of the Earth. Yet to gain a more in-depth understanding of the physical theory, and to be able to develop new models and solutions, it is necessary to be able to derive the relevant equations from first principles. This compact, handy book fills a gap left by most modern geophysics textbooks, which generally do not have space to derive all of the important formulae, showing the intermediate steps. This guide presents full derivations for the classical equations of gravitation, gravity, tides, Earth rotation, heat, geomagnetism, and foundational seismology, illustrated with simple schematic diagrams. It supports students through the successive steps and explains the logical sequence of a derivation – facilitating self-study and helping students to tackle homework exercises and prepare for exams.

Concrete is an essential and irreplaceable constructional material in the modern world. In  recent times, technological advances in the manufacture of cements and the expansion of  the use of concretes and related materials in civil engineering have led to a need for a practical, science-based understanding of these materials and the relationships between their  compositions and properties.

Coring is the removal of sample formation material from a wellbore. To the extent possible, core samples are taken in an undamaged, physically unaltered state. The formation material may be solid rock, friable rock, conglomerates, unconsolidated sands, coal, shales, gumbos, or clays. Coring can be conducted by various methods with a variety of tools.

Microscopy is a servant of all the sciences, and the microscopic examination of minerals is an important technique which should be mastered by all students of geology early in their careers. Advanced modern textbooks on both optics and mineralogy are available, and our intention is not that this new textbook should replace these but that it should serve as an introductory text or a first stepping-stone to the study of optical mineralogy. The present text has been written with full awareness that it will probably be used as a laboratory handbook, serving as a quick reference to the properties of minerals, but nevertheless care has been taken to present a systematic explanation of the use of the microscope as well as theoretical aspects of optical mineralogy. The book is therefore suitable for the novice either studying as an individual or participating in classwork. <...> 

Techniques of geologicmapping and geologicmap creation have changed significantly from traditional paper-based methods. Geologic mapping and data collection in the field is now primarily facilitated by mobile devices and dedicated geologic mapping software. Geologic map production has become a fully integrated process, importing digital data from the field and making use of cartographic software, such as ArcGIS and Adobe Illustrator, to create interactive geologic map products.

This laboratory manual is based on our collective 70-plus years of teaching and coordinating introductory geology courses. Those experiences have helped us understand not only how students best learn geologic principles, but also how to stimulate their engagement with the material to enhance their learning process. Our manual provides (1) an up-to-date, comprehensive background that addresses the hands-on tasks at the core of any introductory geology course; (2) patient stepby-step explanations that are more easily understood by students than those in textbooks; (3) text and exercises that lead students to think like geologists, engaging them in solving real-life problems important to their lives; and (4) the passion and excitement that we still feel after decades as teachers and geologists.

The technical world is changing very rapidly. In only 15 years, the power of personal computers has increased by a factor of nearly one-thousand. By all accounts, it will increase by another factor of one-thousand in the next 15 years. This tremendous power has changed the way science and engineering is done, and there is no better example of this than Digital Signal Processing. <...>

This book is not a text on geomorphological techniques. It is intended as a field handbook to be used during the conduct of geomorphological research. Its prime purpose is to act as an aide memoire containing information essential for efficient fieldwork. One fundamental assumption made in compiling this manual is that the user is familiar with at least the essentials of the techniques that he proposes to employ. However, where possible sufficient information has been included to refresh the user’s memory on the basics of the various techniques.