Selection and Application Guide to Personal Body Armor NIJ Guide 100–01 (Update to NIJ Guide 100–98) U.S

Total Page:16

File Type:pdf, Size:1020Kb

Selection and Application Guide to Personal Body Armor NIJ Guide 100–01 (Update to NIJ Guide 100–98) U.S NOTICE Portions of this guide have been superseded by NCJ 247281, Selection and Application Guide to Ballistic-Resistant Body Armor For Law Enforcement, Corrections and Public Safety: NIJ Selection and Application Guide-0101.06. This new resource supersedes the portions of NIJ Guide 100-01 (NCJ 189633) that deal with ballistic-resistant armor. It does not supersede those portions that deal with stab-resistant armor. A separate guide on stab-resistant armor will be published when NIJ Standard-0115.00, Stab Resistance of Personal Body Armor (NCJ 183652), is updated. U.S. Department of Justice Office of Justice Programs National Institute of Justice Selection and Application Guide to Personal Body Armor NIJ Guide 100–01 (Update to NIJ Guide 100–98) U.S. Department of Justice Office of Justice Programs 810 Seventh Street N.W. Washington, DC 20531 John Ashcroft Attorney General Deborah J. Daniels Assistant Attorney General Sarah V. Hart Director, National Institute of Justice Office of Justice Programs National Institute of Justice World Wide Web Site World Wide Web Site http://www.ojp.usdoj.gov http://www.ojp.usdoj.gov/nij U.S. Department of Justice Office of Justice Programs National Institute of Justice Selection and Application Guide to Personal Body Armor NIJ Guide 100–01 (Replaces Selection and Application Guide to Police Body Armor, NIJ Guide 100–98) November 2001 Published by: The National Institute of Justice’s National Law Enforcement and Corrections Technology Center Lance Miller, Testing Manager P.O. Box 1160, Rockville, MD 20849–1160 800–248–2742; 301–519–5060 NCJ 189633 National Institute of Justice Sarah V. Hart Director Office of Science and Technology Wendy Howe Program Manager, Standards and Testing Points of view are those of the authors and do not necessarily represent the official position of the U.S. Department of Justice. This document is not intended to create, does not create, and may not be relied upon to create any rights, substantive or procedural, enforceable by any party in any matter civil or criminal. The National Law Enforcement and Corrections Technology Center is supported by Cooperative Agreement 96–MU–MU–K011 awarded by the U.S. Department of Justice, Office of Justice Programs, National Institute of Justice. The products, manufacturers, and organizations discussed in this publication are presented for informational purposes only and do not constitute product approval or endorsement by the National Institute of Justice, U.S. Department of Justice; National Institute of Standards and Technology, U.S. Department of Commerce; or Aspen Systems Corporation. The National Institute of Justice is a component of the Office of Justice Programs, which also includes the Bureau of Justice Assistance, the Bureau of Justice Statistics, the Office of Juvenile Justice and Delinquency Prevention, and the Office for Victims of Crime. SELECTION AND APPLICATION GUIDE TO PERSONAL BODY ARMOR Foreword NIJ is pleased to release this updated edition of NIJ’s guide to selecting body armor. The update incorporates several important changes: First, it includes information from the new Ballistic Resistance of Personal Body Armor, NIJ Standard–0101.04, which was the result of 3 years of study, research, and collaboration by the Office of Law Enforcement Standards (OLES) at the National Institute of Standards and Tech- nology. It also contains information on NIJ’s new Stab Resistance of Personal Body Armor, NIJ Standard–0115.00, which was developed by OLES in conjunction with the Police Scientific Development Branch of the United Kingdom and released in September 2000. Second, the title has changed from the Selection and Application Guide to Police Body Armor to the Selection and Application Guide to Personal Body Armor. The title change reflects recogni- tion of the need for corrections officers to wear body armor just as law enforcement officers do. We at NIJ, the National Law Enforcement and Corrections Technology Center (NLECTC) sys- tem, and OLES are excited about the forward progress and momentum that these new standards will produce in body armor technology. We hope criminal justice agencies will use this guide as they select protective armor that is suit- ed to their individual needs. Your comments on the usefulness of this document or suggestions for future editions are welcome. Please send them to NLECTC, c/o Selection and Application Guide to Personal Body Armor, P.O. Box 1160, Rockville, MD 20849–1160; fax to 301–519–5149; or e-mail to [email protected]. Sarah V. Hart Director National Institute of Justice iii SELECTION AND APPLICATION GUIDE TO PERSONAL BODY ARMOR Table of Contents Foreword ....................................................................................................................................iii 1. Overview of the Guide ............................................................................................................1 2. A History of Body Armor........................................................................................................3 The History of NIJ’s Body Armor Testing Program ........................................................4 The Use of Body Armor Today ........................................................................................6 3. Why Wear Body Armor? ........................................................................................................7 The Cost ............................................................................................................................7 The Ballistic Threat ..........................................................................................................8 The Stab Threat................................................................................................................11 Not Just Bullets and Knives ............................................................................................11 2,500 Reasons ..................................................................................................................12 4. Body Armor Construction ....................................................................................................15 How Does Ballistic-Resistant Body Armor Work? ........................................................15 How Does Stab-Resistant Body Armor Work? ..............................................................15 Construction Methods......................................................................................................16 Model and Style Designation ..........................................................................................17 ISO 9000..........................................................................................................................19 Materials Used ................................................................................................................20 5. The NIJ Standards ................................................................................................................23 Developing the NIJ Standard for Ballistic Resistance of Personal Body Armor............23 The Current Standard, NIJ Standard–0101.04 ................................................................24 Introducing Stab-Resistance of Personal Body Armor, NIJ Standard–0115.00..............25 Cooperative Efforts Between NLECTC and Industry ....................................................26 The Standards Review Process........................................................................................28 6. Ballistic-Resistant Personal Body Armor............................................................................31 Selecting the Appropriate Level of Protection ................................................................31 The “Takeaway” Problem................................................................................................32 The Corrections Threat ....................................................................................................33 Armor Classifications for Ballistic-Resistant Armor ......................................................34 Requirements ..................................................................................................................36 Performance Testing ........................................................................................................38 V50 Testing ......................................................................................................................40 Ballistic Limit Testing ....................................................................................................41 Acceptance and In-Service Testing ................................................................................41 7. Stab-Resistant Personal Body Armor..................................................................................43 Armor Classifications for Stab-Resistant Armor ............................................................43 Developing the Testing Procedure ..................................................................................44 Overtest............................................................................................................................44 v SELECTION AND APPLICATION GUIDE TO PERSONAL BODY ARMOR 8. Armor Selection ....................................................................................................................45 Armor Styles....................................................................................................................45
Recommended publications
  • Piecing Together the Construction of Soft Body Armor
    By Jeannine Heinecke Piecing together the construction of soft body armor hen I started in law today’s soft body armor is becoming “W enforcement in the mid- a more sleek, comfortable, flexible, 1970s, the first vest I got looked life-protecting second skin for law and felt like a Manhattan Yellow enforcement officers. With this evo- Pages wrapped in a plastic bag,” lution comes improved wear rates describes Georg Olsen, a long-time and more lives saved. “Officers aren’t veteran of law enforcement and obstinate or stupid,” comments general manager of U.S. Armor, Olsen. “They want the protection, located in Cerritos, California. but they have to have the flexibility Through the evolution of ballistic and mobility to do their jobs.” fibers and construction methods, Part of finding the right protec- U.S. Armor’s Tactical Assault Vest (T.A.V.) and Terminal Velocity series vest. tion is making an educated deci- Wagner, manager of technology construction allows for faster ener- sion when purchasing soft body for Honeywell’s Advanced Fibers gy dissipation and reduced back- armor. Officers need to know and Composites Group. “It has face deformation — the energy that the types of fibers used, how a an orientation and regularity. The was not dissipated by the vest and vest should properly fit and the order of the molecular chains is will impact the body. advancements in construction aligned along the length of the Honeywell discovered this pro- methods leading to more fiber, which helps with the trans- cess not only works for HPPE comfortable, wearable vests.
    [Show full text]
  • 16 Textiles in Defence* Richard a Scott Defence Clothing and Textiles Agency, Science and Technology Division, Flagstaff Road, Colchester, Essex CO2 7SS, UK
    16 Textiles in defence* Richard A Scott Defence Clothing and Textiles Agency, Science and Technology Division, Flagstaff Road, Colchester, Essex CO2 7SS, UK 16.1 Introduction To be prepared for War is one of the most effectual means of preserving Peace (George Washington, 1790)1 Defence forces on land, sea, or air throughout the world are heavily reliant on tech- nical textiles of all types – whether woven, knitted, nonwoven, coated, laminated, or other composite forms. Technical textiles offer invaluable properties for military land forces in particular, who are required to move, live, survive and fight in hostile environments. They have to carry or wear all the necessities for comfort and sur- vival and thus need the most lightweight, compact, durable, and high performance personal clothing and equipment. The life-critical requirements for protecting indi- viduals from both environmental and battlefield threats have ensured that the major nations of the world expend significant resources in developing and providing the most advanced technical textiles for military use. 16.2 Historical background Military textile science is not new, and one of the earliest documented studies can probably be credited to Count Rumford, or Benjamin Thompson. Rumford was an American army colonel and scientist who issued a paper in 1792 entitled ‘Philo- sophical Transactions’, which reported on the importance of internally trapped air in a range of textile fabrics to the thermal insulation provided by those fabrics.2 He was awarded the Copley Medal for his paper, as the significance of his discovery was recognised immediately. * Copyright MOD (1997) DCTA, Colchester, Essex CO2 7SS 426 Handbook of technical textiles 16.2.1 Pre-Twentieth century Up until the end of the 19th century military land battles were fought at close quar- ters by individual engagements.
    [Show full text]
  • Thermal Comfort Properties of Knit-Plated Fabric Made of Ballistic Nylon with Wool
    THERMAL COMFORT PROPERTIES OF KNIT-PLATED FABRIC MADE OF BALLISTIC NYLON WITH WOOL Rana Faruq Mahbub College of Human Sciences & Design, Department of Fashion & Textile, King Abdul-Aziz University, Abdullah Suleiman Street, Jeddah, Saudi Arabia [email protected] Abstract: Recently knitted fabrics structure was developed for protective garments. The new fabric made of ballistic nylon plated with wool called knit-plated was designed and evaluated for thermal and water- vapour resistance. Also, the moisture management properties were investigated to measure the enhancement of wool to the fabric. The surface properties of the fabric, including coefficient of friction and surface roughness, were measured. The results indicates that the ballistic nylon-wool achieved good thermal comfort as well as the wool provide an average accumulative one way water transport. Furthermore, the results reveal that the fabric has smooth surface in the next-to-skin side due to plated wool. Keywords: ballistic nylon, thermal comfort, knit plated, moisture management, surface roughness. 1 INTRODUCTION comfort. The results revel that both fabrics provided a moderate comfort as a multi-layer panel and single Knitted fabric structures have been used in deferent fabric [5]. applications that include protective apparel such as firefighter clothes and soft body armour [1]. In this study, the Knit-Plated structure made Most ballistic body armours used today consist of ballistic nylon-wool fabric was manufactured based of multiple layers of fabric and are made on the Mahbub [4] "weft-knit plated" Kevlar-wool of expensive high-performance fibres such as Kevlar, fabric, and wool has been incorporated in the fabric Zylon, Twaron or Spectra [1, 2].
    [Show full text]
  • From Knights' Armour to Smart Work Clothes
    September 16, 2020 Suits of steel: from knights’ armour to smart work clothes From traditional metal buttons to futuristic military exoskeletons, which came to the real world from the pages of comics. From the brigandines of medieval dandies to modern fire-resistant clothing for hot work areas. Steel suits have come a long way, and despite a brief retreat caused by a “firearm”, they are again conquering the battlefields and becoming widely used in cutting-edge operations. Ancestors of skins and cotton wool The first armour that existed covered the backs of warriors. For the Germanic tribes who attacked the Roman Empire, it was not considered shameful to escape battle. They protected their chests by dodging, while covering their backs, which became vulnerable when fleeing, with thick animal skins over the shoulders. Soldiers of ancient Egypt and Greece wore multi-layer glued and quilted clothes as armour. Mexican Aztecs faced the conquistadors in quilted wadded coats a couple of fingers thick. In turn, the Spanish borrowed the idea from the Mexicans. In medieval Europe, such protective clothing was widely used up to the 16th century. The famous Caucasian felt cloak also began life as armour. Made of wool using felting technology, it was invulnerable against steel sabres , arrows and even some types of bullets. Metal armour: milestones Another ancient idea for protective clothing was borrowed from animals. The scaled skin of pangolins was widely used as armour by Indian noble warriors, the Rajputs. They began to replicate a scaly body made of copper back in ancient Mesopotamia, then they began to use brass and later steel.
    [Show full text]
  • Page 0 Menu Roman Armour Page 1 400BC - 400AD Worn by Roman Legionaries
    Roman Armour Chain Mail Armour Transitional Armour Plate Mail Armour Milanese Armour Gothic Armour Maximilian Armour Greenwich Armour Armour Diagrams Page 0 Menu Roman Armour Page 1 400BC - 400AD Worn by Roman Legionaries. Replaced old chain mail armour. Made up of dozens of small metal plates, and held together by leather laces. Lorica Segmentata Page 1 100AD - 400AD Worn by Roman Officers as protection for the lower legs and knees. Attached to legs by leather straps. Roman Greaves Page 1 ?BC - 400AD Used by Roman Legionaries. Handle is located behind the metal boss, which is in the centre of the shield. The boss protected the legionaries hand. Made from several wooden planks stuck together. Could be red or blue. Roman Shield Page 1 100AD - 400AD Worn by Roman Legionaries. Includes cheek pieces and neck protection. Iron helmet replaced old bronze helmet. Plume made of Hoarse hair. Roman Helmet Page 1 100AD - 400AD Soldier on left is wearing old chain mail and bronze helmet. Soldiers on right wear newer iron helmets and Lorica Segmentata. All soldiers carry shields and gladias’. Roman Legionaries Page 1 400BC - 400AD Used as primary weapon by most Roman soldiers. Was used as a thrusting weapon rather than a slashing weapon Roman Gladias Page 1 400BC - 400AD Worn by Roman Officers. Decorations depict muscles of the body. Made out of a single sheet of metal, and beaten while still hot into shape Roman Cuiruss Page 1 ?- 400AD Chain Mail Armour Page 2 400BC - 1600AD Worn by Vikings, Normans, Saxons and most other West European civilizations of the time.
    [Show full text]
  • Inspecting, Cleaning, Repairing and Retiring Chain Saw Chaps
    United States Department of Agriculture Fire, Safety & Health Forest Service Technology & Development Program June 2004 5100/6700 0451-2324P–MTDC Inspecting, Cleaning, Repairing, and Retiring USDA Forest Service Chain Saw Chaps Lori Messenger, Project Assistant, and Tony Petrilli, Project Leader ince 1965, the U.S. Department of Agriculture, How Forest Service Chain Saw Forest Service has provided cut-resistant, protec- Chaps Protect the User tive chaps for chain saw operators. Chain saw chaps have prevented thousands of serious injuries. S The back-coated nylon shell covering the protective TheS Missoula Technology and Development Center Kevlar pad is resistant to water, oil, and abrasion. The (MTDC) has tracked chain contact injuries and accidents pad consists of a shell of coated nylon duck with five and has improved the chaps over the past 35 years. layers of Kevlar inside: woven Kevlar, felted Kevlar, woven Kevlar, woven Kevlar, and felted Kevlar (figure 1). The protective pad in the original style of Forest Service chain saw chaps consisted of four layers of ballistic nylon. This ballistic nylon resisted a chain speed of 1,800 feet per minute without cutting through. In 1981, Forest Service chain saw chaps were redesigned to be stronger and more comfortable. The ballistic nylon was replaced with a Kevlar pad. The level of protection was increased to a chain speed of 2,500 feet per minute without cutting through and the weight of the chaps was reduced by 40 percent. In 2000, chain saw chaps were redesigned to provide more protection and to increase the coverage area. The new chaps are designed to provide protection to a chain speed of 3,200 feet per minute without cutting through.
    [Show full text]
  • M a S T E R C a T a L
    YOU’LL WEAR IT.TM MASTER CATALOG QUALITY | COMFORT | VALUE “” YOU’LL WEAR IT! STEPHEN ARMELLINO PRESIDENT, CEO THANK YOU FOR YOUR SERVICE. For more than 30 years, we at U.S. Armor have had the honor of outfitting the law enforcement and military communities with superior body armor and protective equipment. As former servicemen, officers or family members of both, myself and our dedicated team members take incredible pride and care in the design and construction of our armor and protective equipment. We are thankful for the opportunity to support you in serving us all. As you know, your armor is only effective if it’s worn and therefore, we have committed ourselves to producing the lightest, safest, and most dynamic armor. It is with your comfort and performance needs in mind that we select the most innovative, respected material suppliers and partners and seek to advance our offerings as applicable. While we solemnly ensure that our products are compliant with all applicable standards and requirements, our primary objective is to protect and support you, so you can focus on effectively doing your job. We thank you for your trust in us and in return, we promise to deliver superior body armor that you’ll comfortably wear. Sincerely, - STEPHEN ARMELLINO A HISTORY TO PROTECT U.S. ARMOR has provided superior body armor and He has taken his father’s protective products for more than three decades. Our designs into the 21st legacy dates back to Richard Armellino, Sr., father of century with U.S. Armor’s current U.S.
    [Show full text]
  • HONEYCOMB in HYBRID COMPOSITE ARMOR RESISTING DYNAMIC IMPACT by ADVAIT BHAT Bachelor of Science in Mechanical Engineering Un
    HONEYCOMB IN HYBRID COMPOSITE ARMOR RESISTING DYNAMIC IMPACT By ADVAIT BHAT Bachelor of Science in Mechanical Engineering University of Mumbai Mumbai, Maharashtra, India 2007 Master of Science in Mechanical and Aerospace Engineering Oklahoma State University Stillwater, Oklahoma 2009 Submitted to the Faculty of the Graduate College of the Oklahoma State University in partial fulfillment of the requirements for the Degree of DOCTOR OF PHILOSOPHY JULY 2015 HONEYCOMB IN HYBRID COMPOSITE ARMOR RESISTING DYNAMIC IMPACT Dissertation approved: Dr. Jay C. Hanan Dissertation Adviser Dr. Sandip P. Harimkar Dr. Raman P. Singh Dr. Semra Peksoz Outside Committee Member ii ACKNOWLEDGEMENTS I thank financial support for this work by MetCel LLC and the Helmerich Research Center through grants to the Oklahoma State University Foundation. Funding from the Oklahoma Center for Advancement and Technology - Oklahoma Applied Research Support (OCAST-OARS Award Nos. AR12.-041, AR 131-037) and the National Science Foundation (NSF Award No: 1214985) was critical for the project success. I thank my adviser Dr. Jay Hanan for his guidance and supervision during the entire span of this project. I express my deepest gratitude for his continuous motivation and patience during my academic endeavor at Oklahoma State University. I thank my outside committee member Dr. Semra Peksoz for being my mentor on body armor and familiarizing me with their design principles and prevalent test procedures. I gratefully thank Dr. Raman Singh and Dr. Sandip Harimkar for being on my dissertation committee. I extended my appreciation to the personnel from DSM Dyneema, The Safariland group, US Shooting Academy, and Leading Technology Composites for their assistance on ballistic tests.
    [Show full text]
  • Ballistic Protection: New Products and Developments
    Ballistic protection: New products and developments In 2017, Teijin Aramid is launching two new ballistic protection products: Endumax Shield XF33, a plate solution for vehicles, vessels and body armor, and Twaron ComForte SB3, a highly flexible solution specifically developed for body armor products. In addition, Teijin Aramid’s Application Competence Center in Wuppertal, Germany, has increased its testing output by 83% over the past year. These developments will allow Teijin Aramid to continue providing a high level of service to its customers, offer a broader product portfolio, and maintain its competitive position in the global ballistic protection market. A unique focus on ballistic protection “For over 30 years, Teijin Aramid has been developing high-performance ballistic protection solutions that have saved countless lives,” says Manon Schuurmans, Business Department Manager Ballistics at Teijin Aramid. “During this time, we’ve built up a complete portfolio of both aramid and UHMW-PE based products and solutions for both personal protection and protective equipment. In addition, our technical team has developed extensive know-how and expertise in several specific ballistic application areas fo body armor, helmets, ground vehicle, vessels and aerospace. Thanks to our experience and state-of-the-art research and development facilities, Teijin Aramid is in a unique position Supported by high levels of technical expertise to address the market needs for ballistic protection.” “We wouldn’t have been able to launch our new products without our high levels of technical knowledge and high- New products: Endumax Shield XF33 and Twaron quality research facilities,” says Manon. “Specifically, our ComForte SB3 Application Competence Center in Wuppertal is “In 2017, we’re launching Endumax Shield XF33 and Twaron instrumental to driving our ballistic protection propositions.
    [Show full text]
  • Plate Armor (Edited from Wikipedia)
    Plate Armor (Edited from Wikipedia) SUMMARY Plate armor is a historical type of personal body armor made from iron or steel plates, culminating in the iconic suit of armor entirely encasing the wearer. While there are early predecessors, full plate armor developed in Europe during the Late Middle Ages, especially in the context of the Hundred Years' War, from the coat of plates worn over mail suits during the 13th century. In Europe, plate armor reached its peak in the late 15th and early 16th centuries. The full suit of armor is thus a feature of the very end of the Middle Ages and of the Renaissance period. Its popular association with the "medieval knight" is due to the specialized jousting armor which developed in the 16th century. Full suits of Gothic plate armor were worn on the battlefields of the Burgundian and Italian Wars. The most heavily armored troops of the period were heavy cavalry such as the gendarmes and early cuirassiers, but the infantry troops of the Swiss mercenaries and the landsknechts also took to wearing lighter suits of "three quarters" munition armor, leaving the lower legs unprotected. The use of plate armor declined in the 17th century, but it remained common both among the nobility and for the cuirassiers throughout the European wars of religion. After 1650, plate armor was mostly reduced to the simple breastplate (cuirass) worn by cuirassiers. This was due to the development of the flintlock musket, which could penetrate armor at a considerable distance. For infantry, the breastplate gained renewed importance with the development of shrapnel in the late Napoleonic wars.
    [Show full text]
  • Contemporary Personal Ballistic Protection (PBP)
    Chapter 8 Contemporary Personal Ballistic Protection (PBP) Izabela Luiza Ciesielska-Wróbel Additional information is available at the end of the chapter http://dx.doi.org/10.5772/intechopen.69085 Abstract The review concerns existing contemporary protective equipment and their compo- nents serving against ballistic and non-ballistic threats of different sorts. The main focus, however, is on the personal ballistic protection (PBP) based on textile components and their role in the protective elements. Soft ballistic protections are crucial Soft ballistic protections are crucial elements of PBP, forexample in military and law enforcements. Although the subject of PBP was limited in this chapter to soft ballistic protection, other elements, e.g. hard ballistic protection, stab-resistant vests, dual threat, so-called in-con- junction protective elements, modern helmets, were also mentioned in this chapter to demonstrate positioning of the soft ballistic protection and other elements in the global personal protection approach. Apart from it, the chapter contains selected information concerning high-performance polymers and fibres as well as a brief notes about their application in protective panels being basic elements of any protective element. The final remarks concern the most up-to-date approach in relation to ballistic protection, which is immersing high-performance fibres into non-Newtonian liquid substances having the ability of ordering their chemical particles and changing into a high concentration and high segregation lattice under the influence of kinetic energy impact. Keywords: personal ballistic protection, soft body armour, hard body armour, dual threat, stab-resistant vests, bullet-resistant vests, protective panels, high-performance fibres 1. Introduction This chapter provides selected and the most up-to-date information concerning personal ballistic protection (PBP).
    [Show full text]
  • Protective Armor Engineering Design
    PROTECTIVE ARMOR ENGINEERING DESIGN PROTECTIVE ARMOR ENGINEERING DESIGN Magdi El Messiry Apple Academic Press Inc. Apple Academic Press Inc. 3333 Mistwell Crescent 1265 Goldenrod Circle NE Oakville, ON L6L 0A2 Palm Bay, Florida 32905 Canada USA USA © 2020 by Apple Academic Press, Inc. Exclusive worldwide distribution by CRC Press, a member of Taylor & Francis Group No claim to original U.S. Government works International Standard Book Number-13: 978-1-77188-787-8 (Hardcover) International Standard Book Number-13: 978-0-42905-723-6 (eBook) All rights reserved. No part of this work may be reprinted or reproduced or utilized in any form or by any electric, mechanical or other means, now known or hereafter invented, including photocopying and re- cording, or in any information storage or retrieval system, without permission in writing from the publish- er or its distributor, except in the case of brief excerpts or quotations for use in reviews or critical articles. This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission and sources are indicated. Copyright for individual articles remains with the authors as indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the authors, editors, and the publisher cannot assume responsibility for the validity of all materials or the consequences of their use. The authors, editors, and the publisher have attempted to trace the copyright holders of all material reproduced in this publication and apologize to copyright holders if permission to publish in this form has not been obtained.
    [Show full text]