The dynamical properties of solids have recently attracted renewed interest in connection with the increasing understanding of phase transitions and re lated phenomena. In particular, soft modes or, more generally, phonon 'anom alies' seem to play an important role in structural and electronic phase tran sitions, such as ferroelectric or superconducting transitions. The understanding of the mechanisms responsible for the occurrence of unusually low frequencies in phonon spectra requires a detailed analysis of the microscopic forces governing the lattice vibrations. Of particular importance is the influence of the electron lattice interaction in the adiabatic approximation which in many cases is the origin of peculiarities in the phonon self-energy. In this work the vibrational spectra of pure non-metals and of those con taining point defects are investigated. ' In these materials the interrelation be tween the pseudo-harmonic forces (determining the phonon dispersion re lations) and the non-linear anharmonic and electron-phonon forces (as they act in infrared and Raman spectra) is most obvious and can be quantitatively analysed in terms of appropriate models. The main task is to arrive at a physically correct treatment of electronic degrees of freedom, as for example in an electronic 'shell' model, which leads to the description of phonon spectra in terms of long-range polarizabilities and short-range deformabilities. The pur pose of our review is to stimulate further investigations which, we hope, will result in explicit relations between the parameters of the semi-microscopic models and the matrix elements from the electronic band structure."

Lippincott (R) Connect Featured Title Purchase the new print edition of this Lippincott (R) Connect title includes access to the digital version of the book, plus related materials such as videos and multiple-choice Q&A and self-assessments. Ideal as a stand-alone review or as a perfect companion to NMS Surgery, Seventh Edition, this leading casebook for the surgical rotation presents a series of surgical cases that begin with a clinical scenario and progress step by step through the decision-making process of patient management. Concise and portable, NSM Surgery Casebook, Third Edition fits in a lab coat pocket-ideal for review on the wards. Retaining the structured subject review, practice questions for the USMLE Step 2 exam, and focus on helping students work through clinical cases with a unique "what next" approach to decision making, this third edition offers a new full-color design, new study aids, and key updates throughout. A unique, case-based surgical review, with case variations, teaches effective surgical approach and allows students to practice real-world clinical decision making and prepare for exams. New and updated cases reflect modern surgical practice. Revised Cutting to the Chase feature at the beginning of each chapter presents a high-yield overview of important concepts. New Critical Surgical Associations from NMS Surgery cover associations and important sequences in a highly visual way. All-new radiographic images are easier to read and interpret. Easy-to-spot Digging Deep boxes provide high-yield information in an easily accessible way. An extensive illustration program provides opportunities to make patient management decisions based on visual cues. Lippincott (R) Connect features: Full access to the digital version of the book with the ability to highlight and take notes on key passages for a more personal, efficient study experience. Carefully curated resources, such as interactive diagrams, audio and video tutorials, and self-assessment, all designed to facilitate further comprehension. Lippincott (R) Connect also allows users to create Study Collections to further personalize the study experience. With Study Collections you can: Pool content from books across your entire library into self-created Study Collections based on discipline, procedure, organ, concept or other topics. Display related text passages, video clips and self-assessment questions from each book (if available) for efficient absorption of material. Annotate and highlight key content for easy access later. Navigate seamlessly between book chapters, sections, self-assessments, notes and highlights in a single view/page.

NMS. Cirugía. Casos clínicos 3.ª es ideal como obra de consulta independiente o como complemento de la 7.ª edición de NMS Cirugía. Este libro de casos clínicos, excelente para las rotaciones quirúrgicas, presenta series de casos clínicos quirúrgicos y fundamentos teóricos. Los casos están organizados por sistemas y abordan las presentaciones comunes de los problemas clínicos. Cada caso comienza con un escenario clínico y se desarrolla paso a paso a través del proceso de análisis y toma de decisiones para el manejo del paciente. La obra se presenta con el enfoque perfecto para ayudar a los estudiantes a analizar y resolver casos clínicos seriados con un abordaje único para la toma de decisiones. Esta 3.ª edición ofrece un diseño a todo color, ayudas de estudio y actualizaciones clave en todo el libro.

Lippincott (R) Connect Featured Title Purchase the new print edition of this Lippincott (R) Connect title includes access to the digital version of the book, plus related materials such as videos and multiple-choice Q&A and self-assessments. Now in a portable pocket-sized format packed with high-yield information, updates, and revisions that reflect the current practice of surgery, NMS Surgery, Seventh Edition, is an ideal guide for effective study and review. The new edition retains the elements that have made it a dependable, go-to resource for a generation of medical students and a quick review resource for practitioners preparing for recertification. Featuring new study aids, full-color illustrations, concise, high-yield coverage, and USMLE-format questions, the new edition helps students successfully complete their clerkship and prepare for the shelf/end-of-rotation exam. In addition, this valuable resource is packaged with access to the interactive eBook version with an online quiz bank at no additional cost. Compact and portable-easily fits into a lab coat for quick, high-yield review. A standardized at-a-glance outline format makes it easy to navigate from chapter to chapter when reviewing for the rotation shelf exam. More carefully integrated features, including Chapter Cuts (approach to disease), Quick Cuts (pearls), and Critical Surgical Associations, facilitate different levels of topic review. New Trusted Sources boxes highlight the best, most trusted resources for surgical guidelines to further clinical knowledge. A new Cut to Casebook feature provides handy cross-referencing to cases in the NMS Surgery Casebook, 3rd Edition. Lippincott (R) Connect features: Full access to the digital version of the book with the ability to highlight and take notes on key passages for a more personal, efficient study experience. Carefully curated resources, such as interactive diagrams, audio and video tutorials, and self-assessment, all designed to facilitate further comprehension. Lippincott (R) Connect also allows users to create Study Collections to further personalize the study experience. With Study Collections you can: Pool content from books across your entire library into self-created Study Collections based on discipline, procedure, organ, concept or other topics. Display related text passages, video clips and self-assessment questions from each book (if available) for efficient absorption of material. Annotate and highlight key content for easy access later. Navigate seamlessly between book chapters, sections, self-assessments, notes and highlights in a single view/page.