ow in its fifth edition, Sasol Birds of Southern Africa has been brought fully up to date by its expert author panel, with additional contributions from two new birding experts. Greatly enhanced, this comprehensive, best-selling guide is sure to maintain its place as one of Africa’s most trusted field guides.

Key features of the 5th revised edition:

• More than 800 new illustrations
• Scan and play bird calls using free downloadable app
• Fully revised text (with latest species records), maps and plate annotations
• Fresh input from new contributing authors
• Comprehensive coverage of the region’s birds

This larger edition is based on the updated and expanded fifth edition of Sasol Birds of Southern Africa, which has been brought fully up to date by its expert author panel, with additional contributions from two new birding experts.

Greatly enhanced, this comprehensive, best-selling guide is sure to maintain its place as one of Africa’s most trusted field guides.

Key features of the 5th revised edition:

• More than 800 new illustrations
• Scan and play bird calls using free downloadable app
• Fully revised text (with latest species records), maps and plate annotations
• Fresh input from new contributing authors
• The larger format allows for better appreciation and easier use of the plates.

Now in its fifth edition, Sasol Birds of Southern Africa has been brought fully up to date by its expert author panel, with additional contributions from two new birding experts. Greatly enhanced, this comprehensive, best-selling guide is sure to maintain its place as one of Africa’s most trusted field guides.

Key features of the 5th revised edition:

• More than 800 new illustrations
• Scan and play bird calls using free downloadable app
• Fully revised text (with latest species records), maps and plate annotations
• Fresh input from new contributing authors
• Comprehensive coverage of the region’s birds

Die vyfde uitgawe van Sasol Voëls van Suider-Afrika is tans volledig bygewerk deur die deskundige skrywerspaneel, met bykomende bydraes van twee nuwe voëldeskundiges. Hierdie omvattende topverkopergids is grootliks verbeter en sal beslis sy plek behou as een van die mees betroubare veldgidse in Afrika.

Belangrike kenmerke van die nuwe uitgawe:

• Meer as 800 nuwe illustrasies
• Skandeer en speel voëlroepe deur die gratis aflaaibare toep te gebruik
• Omvattende hersiening (met mees onlangse spesierekords), verspreidingskaarte en plaatbyskrifte
• Nuwe toevoegings van bydraende skrywers
• Omvattende dekking van die streek se voëls

Die vyfde uitgawe van Sasol Voëls van Suider-Afrika is tans volledig bygewerk deur die deskundige skrywerspaneel, met bykomende bydraes van twee nuwe voëldeskundiges. Hierdie omvattende topverkopergids is grootliks verbeter en sal beslis sy plek behou as een van die mees betroubare veldgidse in Afrika.

Belangrike kenmerke van die nuwe uitgawe:

• Meer as 800 nuwe illustrasies
• Skandeer en speel voëlroepe deur die gratis aflaaibare toep te gebruik
• Omvattende hersiening (met mees onlangse spesierekords), verspreidingskaarte en plaatbyskrifte
• Nuwe toevoegings van bydraende skrywers
• Omvattende dekking van die streek se voëls

Hierdie fotografiese veldgids tot die voels van Suider-Afrika bevat die grootste en omvattendste versameling foto's van die area in een volume.

Die 958 voel spesies wat in Suider-Afrika gevind word, word beskryf en geillustreer asook 'n ekstra 17 spesies van die Suidelike Oseaan en geassosieerde eilande en Antarktika. Meer as 2 500 illustrasies wys die ouderdom en geslag variasies, voels op land en in die lug asook kleure.

Teks deur Suid-Afrika se top voel skrywers fokus op identifikasie, roep, habitat en status, broei besonderhede en dieet. Kleur gekoordineerde verspreidingskaarte. Jaarlikse seisoen kolomme wys wanneer spesies daar is en wanneer hulle broei. A-Z gids om groepe op te spoor.

Hierdie gids volg die tradisionele spesie volgorde en bring 'n nuwe dimensie na voel identifikasie in Suider-Afrika. Dit sal onvervangbaar wees in die veld.

In the 1980s, although most social workers organised their time and described their work in terms of cases, research studies had cast serious doubts on the efficacy of working in this way. As a result, there had been growing anxiety about what social workers do, what they ought to do, and the training they needed. Task-centred casework was an approach to social work which proposed a solution to some aspects of this dilemma. Growing out of the surprising results of an American research study, it broke free from the traditional psycho-analytic approach to casework. It aimed at clarity of purpose, a concentration on the clients’ perceptions of the problems, openness about clients’ and helpers’ intentions and agreement about what is to be done and achieved within a specified time. Originally published in 1985, this book brings together three British studies that accompanied, and in some respects pioneered, the introduction of task-centred casework into the United Kingdom. The studies describe and evaluate task-centred casework with social services department clients, with young people on probation, and with men and women referred to hospital after poisoning themselves. The research suggests what task-centred casework can and cannot achieve, describes how clients experience it and seeks to define the skills it requires. The studies also provide some reasons why many previous studies of social work have failed to find evidence for social work effectiveness. The book uses much case material to illustrate methods of task-centred casework and its outcomes as seen by clients, social workers, and an independent outsider. It should still be of interest to social workers, teachers of social work, and social work students. More generally, it will be welcomed by all those who are interested in building social work on a surer basis than anecdote and fashion.

In this book Ian Sinclair provides the practical knowhow required by technician engineers, systems designers and students. The focus is firmly on understanding the technologies and their different applications, not a mathematical approach. The result is a highly readable text which provides a unique introduction to the selection and application of sensors, transducers and switches, and a grounding in the practicalities of designing with these devices.
The devices covered encompass heat, light and motion, environmental sensing, sensing in industrial control, and signal-carrying and non-signal switches.
Get up to speed in this key topic through this leading practical guide
Understand the range of technologies and applications before specifying
Gain a working knowledge with a minimum of maths

In the 1980s, although most social workers organised their time and described their work in terms of cases, research studies had cast serious doubts on the efficacy of working in this way. As a result, there had been growing anxiety about what social workers do, what they ought to do, and the training they needed. Task-centred casework was an approach to social work which proposed a solution to some aspects of this dilemma. Growing out of the surprising results of an American research study, it broke free from the traditional psycho-analytic approach to casework. It aimed at clarity of purpose, a concentration on the clients' perceptions of the problems, openness about clients' and helpers' intentions and agreement about what is to be done and achieved within a specified time. Originally published in 1985, this book brings together three British studies that accompanied, and in some respects pioneered, the introduction of task-centred casework into the United Kingdom. The studies describe and evaluate task-centred casework with social services department clients, with young people on probation, and with men and women referred to hospital after poisoning themselves. The research suggests what task-centred casework can and cannot achieve, describes how clients experience it and seeks to define the skills it requires. The studies also provide some reasons why many previous studies of social work have failed to find evidence for social work effectiveness. The book uses much case material to illustrate methods of task-centred casework and its outcomes as seen by clients, social workers, and an independent outsider. It should still be of interest to social workers, teachers of social work, and social work students. More generally, it will be welcomed by all those who are interested in building social work on a surer basis than anecdote and fashion.

New in Struik Nature’s Pocket Guide series, this book covers an astonishing 500 southern African birds yet is small enough to fit in your pocket.

It is loaded with information that makes for quick and easy bird identification:

• Colour photographs show each bird, giving both male and female images where there's a difference.
• Concise text pinpoints key identification features.
• Distribution maps locate each species in the region.
• Calendar bars show the months when the birds are more likely to be seen.
• Bird size and breeding months are indicated.
• For use at home or when travelling to new climes, this handy pocket guide will be an indispensable companion.

Fully revised, Birds of Africa south of the Sahara provides unrivalled coverage of African birds in a single volume, and is the first book to describe and illustrate all of the birds found in Africa south of the Sahara Desert (the Afrotropic Region), including Socotra, Pemba and islands in the Gulf of Guinea.

Despite its exceptional coverage, this guide is compact enough to use in the field, and follows the standard field guide format, with texts and range maps appearing opposite the colour plates.

First published in 1975, this book compiles a number of studies concerning institutional care and children, which address the question of why institutions that serve apparently similar functions differ so much. The book uses comparative methods such as measurement of different 'dimensions' of institutional care and analysis of interrelationships among specific structural and functional features which characterise particular institutions. As a result, the book draws broad conclusions about the importance of factors that have dynamic influence on the manner in which institutions function and the reasons why they differ. The editors reject the 'steampress' model which postulates that institutions are more or less alike. They discuss ideological and organisational variation, differences in staffing and the manner in which children respond to them, and consider these issues as factors that influence the way in which an institution functions 'as a whole'. Subsequent chapters describe comparative studies carried out in institutions for the mentally handicapped, approved schools, residential nurseries, probation hostels, other 'correctional' institutions and units for autistic children. The book enables the reader to appreciate achievements and shortcomings of contemporary research and thinking in this field.

This photographic field guide to southern African birds comprises the biggest and most comprehensive collection of photographs of the region's birds in one volume.

It describes and illustrates all 958 bird species found in southern Africa, and an additional 17 species recorded from the Southern Ocean and associated islands, and Antarctica. Over 2 500 images show age and sex plumage variations, perched and in-flight birds, and colour morphs where relevant. authors.

Colour-coded distribution maps give resident and migratory status, and bird density. Annual seasonality bars show at a glance when species are present and when they breed. A-Z directory provides quick guide to locating groups. Group introductions provide additional clues to identification.

This comprehensive guide follows traditional species sequence. It brings a new dimension to bird identification in southern Africa and will prove indispensable in the field.

Ook in Afrikaans beskikbaar as Volledige Fotografiese Gids: Voëls Van Suider-Afrika.

This compact, easy-to-use guide features more than 350 of the most conspicuous and commonly seen birds in Namibia.

Pocket Guide Birds of Namibia offers:

- Concise identification text

- Full-colour photographs of all species covered

- Up-to-date distribution maps

- An informative introduction featuring the ‘specials’ of the key birding destinations in Namibia.

An ideal introduction and travelling companion for birders in or visiting the region.

Electronics Simplified, Third Edition, discusses the aims and methods of electronics, with emphasis on digital electronics and software options. It covers the latest developments in electronics, including Blu-ray, digital TV and radio, HD and 3D TV, robotic systems, radar, cellular phones, GPS, and microcomputers. Organized into 17 chapters, the book introduces the reader to every aspect of electronics from fundamentals to applications, with minimal mathematics required. It provides an overview of electricity, waves, and pulses and how a steady voltage is generated, along with power, alternating voltage, and AC and DC transmission. The information on microcomputers has been greatly expanded, while information on analog fundamentals has been retained. It also discusses passive components such as transformers, resistors and capacitors, inductors, transformers, resonance, and diodes; active components and integrated circuits, particularly what a transistor is and what it does; how traditional radio works; elements of television, including color television; digital television and radio broadcasting; and digital signals and digital recording. Finally, the principles of CD recording are explained, along with the basics of microprocessors, calculators, computers, and computer peripherals. This book is essential reading for hobbyists, technicians, professionals, and students. It is suitable for anyone taking a qualification course in electronics, or for those who want to know more about the digital revolution.

Ian Sinclair's Practical Electronics Handbook combines a wealth useful day-to-day electronics information, concise explanations and practical guidance in this essential companion to anyone involved in electronics design and construction. The compact collection of key data, fundamental principles and circuit design basics provides an ideal reference for a wide range of students, enthusiasts, technicians and practitioners of electronics who have progressed beyond the basics.
The sixth edition is updated throughout with new material on microcontrollers and computer assistance, and a new chapter on digital signal processing
. Invaluable handbook and reference for hobbyists, students and technicians
. Essential day-to-day electronics information, clear explanations and practical guidance in one compact volume
. Assumes some previous electronics knowledge but coverage to interest beginners and professionals alike

The Newnes Know It All Series takes the best of what our authors have written to create hard-working desk references that will be an engineer's first port of call for key information, design techniques and rules of thumb. Guaranteed not to gather dust on a shelf!
Part I Fundamentals of Sound
Chapter 1 Audio Principles
Chapter 2. Measurement
Chapter 3 Acoustic Environment
II. Audio Electronics
Chapter 4 Components
Chapter 5 Power supply design

III Preamplifiers and Amplifiers
Chapter 6 Introduction to Audio Amplification
CHAPTER 7 Preamplifiers and input signals
Chapter 8 Interfacing and processing
Chapter 9 Audio amplifiers
Chapter 10 Audio amplifier
Chapter 11. Valve (tube-based) amplifiers
Chapter 12 Negative feedback
Chapter 13 Noise and grounding
Part IV Digital Audio
Chapter 14 Digital audio fundamentals
Chapter 15 Representation of Audio Signals
Chapter 16.Compact disc
Chapter 17 Digital audio recording basics
Chapter 18 Digital audio interfaces
Chapter 19 Data compression
Chapter 20 Digital audio production
Chapter 21 Other Digital Audio Devices
V. Microphone and Loudspeaker Technology
Chapter 22 Microphone technology
Chapter 23 Loudspeakers
Chapter 24 Loudspeaker enclosures
Chapter 25 Headphones
Part VI. Sound Reproduction Systems
Chapter 26 Tape Recording
Chapter 27 Recording consoles
Chapter 28 Video synchronization
Chapter 29 Room acoustics
Part VII Audio Test and Measurement
CHAPTER 30 Fundamentals and instruments
- A 360-degree view from our best-selling authors
- Hot topics covered
- The ultimate hard-working deskreference; all the essential information, techniques and tricks of the trade in one volume

The decision whether or not to reunify a child in care with their birth family is one of the most serious taken by children's services, and often involves considerable risk. This book examines the long-term consequences of this decision for children who entered public care for abuse or neglect. It compares the experiences and progress of children who remained in care or returned to their birth families up to four years after the decision was taken. It covers how the decision is made, the factors taken into account when making it and provides important suggestions for effective decision-making. It compares the progress made by the children in relation to their safety, stability and emotional well-being. The book demonstrates that, contrary to common belief, long-term care can be a positive option for maltreated children. This book provides important messages for reunification policy and practice in relation to maltreated children. It will be essential reading for social work practitioners, researchers and policy makers.

Children in public care complain that they have too many placements. Professionals agree but little is known about the reasons for this instability or how it affects different groups of children. The Pursuit of Permanence explores this core issue for children's services. Based on the largest study of the English care system in recent years, the book examines the children (what they need and what they want), their movements into, out of and within the care system, the nature and quality of their placements and the outcomes (whether the children are settled or happy). It analyses the reasons for movements and outcomes in different groups of children, and the relative impacts of the departments, social work teams and placements. It concludes with suggestions about how the care system should work, what it should offer and how it should be managed and inspected. This detailed, innovative and comprehensive study is essential reading for all professionals and academics involved with fostering, leaving care, adoption and children's services, as well as policy makers and students on social work courses.

Services for families and children are rightfully the focus of intense scrutiny and debate, and there is a clear need to establish a knowledge of which services work well. This volume provides a comprehensive overview of research evidence from the UK and USA on the effectiveness of selected child welfare interventions. It addresses the challenges of measuring effectiveness in child welfare and explains the policy context for child welfare service delivery. Leading international contributors summarize the evidence of effectiveness in each core area, and consider the impact on children's development, parenting capacity and the wider community. Critically, the book also draws out the implications of the evidence for policy, practice and service delivery as well as for future research. This book is essential reading for policy makers, practitioners and commissioners of services in child welfare as well as students and researchers.

How can we determine success in foster placements? Based on exhaustive research, the authors discuss the primary concerns in foster placement planning, considering the high frequency of placement breakdowns, their impact on the child's behaviour and school performance, and the challenges this places on foster families. The specific needs of the foster child are given close attention in determining a pathway to success. By monitoring and describing the individual characteristics of the child within the context of the placement, the authors are able to reveal what types of supports are most beneficial. The implications for this research are considerable. Social workers are given new methods of assessing the needs of foster children which emphasise the process of care and not just the outcome. Policy makers are provided with rich qualitative accounts with which to increase and strengthen the success of foster placements. This is essential reading for social workers, policy makers and foster families.

* What are the consequences of fostering for children, their carers and their birth families? * What are the best ways of recruiting, retaining and supporting foster carers? * What are the most important elements of a successful placement? * Can foster care offer a permanent alternative to care at home? Fostering Now brings together authoritative research on foster care in the UK. It provides a succinct overview of a wide range of research projects and highlights the main implications for policymakers and all professionals involved in the fostering process. Drawing on the varied experiences and views of foster children, social workers, foster carers and parents, this book looks at how placement outcomes are influenced by factors such as foster carers' parenting styles, contact with the child's own parents, and the child's gender, ethnicity, age and physical and emotional health. Other important areas examined include care given by relatives, the effects of foster care on education, and what happens to foster children when they return home. Fostering Now identifies the most significant challenges currently faced by foster care and draws out the key messages for policy and practice. It offers important insights into the state of foster care today, and suggests how it can be improved in future. This book is essential reading for social workers, policy makers, academics and foster carers.