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Books > Science & Mathematics > Science: general issues > Scientific standards
This hands-on guide is primarily intended to be used in
undergraduate laboratories in the physical sciences and
engineering. It assumes no prior knowledge of statistics. It
introduces the necessary concepts where needed, with key points
illustrated with worked examples and graphic illustrations. In
contrast to traditional mathematical treatments it uses a
combination of spreadsheet and calculus-based approaches, suitable
as a quick and easy on-the-spot reference. The emphasis throughout
is on practical strategies to be adopted in the laboratory.
Error analysis is introduced at a level accessible to school
leavers, and carried through to research level. Error calculation
and propagation is presented though a series of rules-of-thumb,
look-up tables and approaches amenable to computer analysis. The
general approach uses the chi-square statistic extensively.
Particular attention is given to hypothesis testing and extraction
of parameters and their uncertainties by fitting mathematical
models to experimental data. Routines implemented by most
contemporary data analysis packages are analysed and explained. The
book finishes with a discussion of advanced fitting strategies and
an introduction to Bayesian analysis.
Qiu Guangming, the author of this book, has been a researcher on
the measuring and weighing systems in China for more thirty years.
He has been collecting historical data and examining actual
objects, which has resulted in numerous research papers and books.
This book examines the systems she has researched.
The first part of this book overviews the physics of lasers and
describes some of the more common types of lasers and their
applications. Applications of lasers include CD/DVD players, laser
printers and fiber optic communication devices. Part II of this
book describes the phenomenon of Bose-Einstein condensation. The
experimental techniques used to create a Bose-Einstein condensate
provide an interesting and unconventional application of lasers;
that is, the cooling and confinement of a dilute gas at very low
temperature.
This book is an introduction to the mechanical properties, the
force generating capacity, and the sensitivity to mechanical cues
of the biological system. To understand how these qualities govern
many essential biological processes, we also discuss how to measure
them. However, before delving into the details and the techniques,
we will first learn the operational definitions in mechanics, such
as force, stress, elasticity, viscosity and so on. This book will
explore the mechanics at three different length scales - molecular,
cellular, and tissue levels - sequentially, and discuss the
measurement techniques to quantify the intrinsic mechanical
properties, force generating capacity, mechanoresponsive processes
in the biological systems, and rupture forces.
Semiconductors and Modern Electronics is a brief introduction to
the physics behind semiconductor technologies. Chuck Winrich, a
physics professor at Babson College, explores the topic of
semiconductors from a qualitative approach to understanding the
theories and models used to explain semiconductor devices.
Applications of semiconductors are explored and understood through
the models developed in the book. The qualitative approach in this
book is intended to bring the advanced ideas behind semiconductors
to the broader audience of students who will not major in physics.
Much of the inspiration for this book comes from Dr. Winrich's
experience teaching a general electronics course to students
majoring in business. The goal of that class, and this book, is to
bring forward the science behind semiconductors, and then to look
at how that science affects the lives of people.
The book covers in particular state-of-the-art scientific research
about product quality control and related health and environmental
safety topics, including human, animal and plant safety assurance
issues. These conference proceedings provide contemporary
information on the general theoretical, metrological and practical
issues of the production and application of reference materials.
Reference materials play an integral role in physical, chemical and
related type of measurements, ensuring their uniformity,
comparability and the validity of quantitative analysis as well as,
as a result, the objectivity of decisions concerning the
elimination of technical barriers in commercial and economic,
scientific and technical and other spheres of cooperation. The book
is intended for researchers and practitioners in the field of
chemistry, metrologists, technical physics, as well as for
specialists in analytical laboratories, or working for companies
and organizations involved in the production, distribution and use
of reference materials.
For a physicist, "noise" is not just about sounds, but refers to
any random physical process that blurs measurements, and in so
doing stands in the way of scientific knowledge. This book deals
with the most common types of noise, their properties, and some of
their unexpected virtues. The text explains the most useful
mathematical concepts related to noise. Finally, the book aims at
making this subject more widely known and to stimulate the interest
for its study in young physicists.
This book addresses instruments, methodologies and diagnostic
methods used to evaluate and diagnose human movement, locomotion
and physical status in general. Starting from historical
perspective, the idea of understanding human locomotion by applying
technical measurement devices and incorporating measurement data
into physical representation of gross body movement is presented
and explained, an approach known as inverse dynamics. With this
approach as a kind of umbrella concept, components of measurement
systems including relevant signal and data processing methods are
described. Modern instruments to capture body movement by measuring
its kinematics, kinetics and surface electromyography (sEMG) are
thus described; all systems being used dominantly-if not
exclusively-in a movement analysis laboratory setting. Focusing
mainly on human posture and gait, but including also examples of
movement patterns from selected kinesiological and sports
activities, the book attempts to present essentials of biomechanics
and biomedical engineering approach to this subject matter. It
illustrates how data collected and elaborated by modern engineering
technology can complement traditional expert knowledge of a
kinesiologist or a medical doctor. The book is applicable in the
fields of sports, physical activities, as well as in medical
diagnostics and rehabilitation. The examples of this book's
practical application might be in evaluation of efficiency of human
gait, in evaluation of skeletal muscle fatigue in physical
exercise, in biomechanical diagnostics of traumatological
conditions requiring orthopaedic treatment and the like. This book
can also be used in planning and executing research endeavours,
particularly in a clinical context as a reference for various
diagnostics procedures. It presents the lecture notes of a course
carrying the same name within Medical Studies in English at the
University of Zagreb for more than a decade.
This book introduces the physics and chemistry of plastic
scintillators (fluorescent polymers) that are able to emit light
when exposed to ionizing radiation, discussing their chemical
modification in the early 1950s and 1960s, as well as the renewed
upsurge in interest in the 21st century. The book presents
contributions from various researchers on broad aspects of plastic
scintillators, from physics, chemistry, materials science and
applications, covering topics such as the chemical nature of the
polymer and/or the fluorophores, modification of the photophysical
properties (decay time, emission wavelength) and loading of
additives to make the material more sensitive to, e.g., fast
neutrons, thermal neutrons or gamma rays. It also describes the
benefits of recent technological advances for plastic
scintillators, such as nanomaterials and quantum dots, which allow
features that were previously not achievable with regular organic
molecules or organometallics.
This book presents the design and development of an access control
architecture for the Internet of Things (IoT) systems. It considers
the significant authentication and authorization issues for
large-scale IoT systems, in particular, the need for access
control, identity management, delegation of access rights and the
provision of trust within such systems. It introduces a
policy-based access control approach for the IoT that provides
fine-grained access for authorized users to services while
protecting valuable resources from unauthorized access. Further,
the book discusses an identity-less, asynchronous and decentralized
delegation model for the IoT leveraging the advantage of blockchain
technology. It also presents an approach of attribute-based
identity and examines the notion of trust in an IoT context by
considering the uncertainty that exists in such systems. Fully
explaining all the techniques used, the book is of interest to
engineers, researchers and scientists working in the field of the
wireless sensor networks, IoT systems and their access control
management.
Electrostatic Accelerators have been at the forefront of modern
technology since the development by Sir John Cockroft and Ernest
Walton in 1932 of the first accelerator, which was the first to
achieve nuclear transmutation and earned them the Nobel Prize in
Physics in 1951. The applications of Cockroft and Walton's
development have been far reaching, even into our kitchens where it
is employed to generate the high voltage needed for the magnetron
in microwave ovens. Other electrostatic accelerator related Nobel
prize winning developments that have had a major socio-economic
impact are; the electron microscope where the beams of electrons
are produced by an electrostatic accelerator, X-rays and computer
tomography (CT) scanners where the X-rays are produced using an
electron accelerator and microelectronic technology where ion
implantation is used to dope the semiconductor chips which form the
basis of our computers, mobile phones and entertainment systems.
Although the Electrostatic Accelerator field is over 90 years old,
and only a handful of accelerators are used for their original
purpose in nuclear physics, the field and the number of
accelerators is growing more rapidly than ever. The objective of
this book is to collect together the basic science and technology
that underlies the Electrostatic Accelerator field so it can serve
as a handbook, reference guide and textbook for accelerator
engineers as well as students and researchers who work with
Electrostatic Accelerators.
Photoemission (also known as photoelectron) spectroscopy refers to
the process in which an electron is removed from a specimen after
the atomic absorption of a photon. The first evidence of this
phenomenon dates back to 1887 but it was not until 1905 that
Einstein offered an explanation of this effect, which is now
referred to as ""the photoelectric effect"". Quantitative Core
Level Photoelectron Spectroscopy: A Primer tackles the pragmatic
aspects of the photoemission process with the aim of introducing
the reader to the concepts and instrumentation that emerge from an
experimental approach. The basic elements implemented for the
technique are discussed and the geometry of the instrumentation is
explained. The book covers each of the features that have been
observed in the X-ray photoemission spectra and provides the tools
necessary for their understanding and correct identification.
Charging effects are covered in the penultimate chapter with the
final chapter bringing closure to the basic uses of the X-ray
photoemission process, as well as guiding the reader through some
of the most popular applications used in current research.
This book examines modern methods of creating models and measures
in measurements, physical and probabilistic measures, models,
spaces and bases of signals and fields, deterministic and
probabilistic models and measures of angular quantities. Examples
of their use on a circle and in phase measurements are given;
models and measures for diagnostics in the electric power industry,
in standardless measurements of the characteristics of composite
materials, in environmental pollution monitoring systems, also with
using unmanned aerial vehicles, are considered. Most of the
presented results were obtained on the basis of the Institute of
Engineering Thermophysics of National Academy of Sciences of
Ukraine. The book is intended for researchers, engineers, as well
as lecturers, graduate students and students of higher educational
institutions dealing with the problems of measurements, monitoring
and diagnostics of complex technical objects.
This thesis presents the first ever measurement of the noise
emitted by magnetic monopoles and the development of an exquisitely
sensitive magnetic-field-noise spectrometer based on a
superconducting quantum interference device (SQUID) that enabled
it. Magnetic monopoles are highly elusive elementary particles
exhibiting quantized magnetic charge. The prospects for studying
them brightened recently with the theoretical discovery that the
thermally excited states in certain classes of magnetic insulators
exhibit all the characteristics of magnetic monopoles. Furthermore,
in 2018, it was predicted that the random motion of magnetic
monopoles inside would generate a very specific kind of
magnetization noise. In this thesis, the author describes a new
experimental technique, so-called spin noise spectroscopy, and the
subsequent discovery of virtually all of the predicted features of
the magnetic noise expected from a dense fluid of magnetic
monopoles in crystals of Dy2Ti2O7. Remarkably, because this
magnetic monopole noise occurs in the frequency range below 20kHz,
when amplified by the SQUID it is actually audible to humans.
This book provides easy-to-understand explanations to
systematically and comprehensively describe the X-ray CT
technologies, techniques, and skills used for industrial and
scientific purposes. Included are many references along with
photographs, figures, and equations prepared by the author. These
features all facilitate the reader's gaining a deeper understanding
of the topics being discussed. The book presents expertise not only
on fundamentals but also about hardware, software, and analytical
methods for the benefit of technical users. The book targets
engineers, researchers, and students who are involved in research,
development, design, and quality assurance in industry and
academia.
Angelo Secchi was a key figure in 19th century science. An Italian
Jesuit and scientist, he helped lead the transition from astronomy
to astrophysics and left a lasting legacy in the field. Secchi’s
spectral classification of stars was a milestone that paved the way
for modern astronomical research. He was also a founder of modern
meteorology and an innovator in the design and development of new
instruments and methods across disciplines.This contributed volume
collects together reviews from an international group of
historians, scientists and scholars representing the multiple
disciplines where Secchi made significant contributions during his
remarkable career. It analyzes both his famous and lesser known
pioneering efforts with equal vigor, providing a well-rounded
narrative of his life’s work. Beyond his scientific and
technological work, his role as a Jesuit priest in Rome during the
turbulent years of the mid 19th century is also described and
placed in the context of his scientific and civic activities.
This book gives an overview of modern cathodes and electron
emitters for vacuum tubes and vacuum electron devices in general.
It covers the latest developments in field emission theory as well
as new methods towards improving thermionic and cold cathodes. It
addresses thermionic cathodes, such as oxide cathodes, impregnated
and scandate cathodes, as well as photocathodes and field emitters
- the latter comprising carbon nanotubes, graphene and Spindt-type
emitter arrays. Despite the rise and fall of the once dominant
types of vacuum tubes, such as radio valves and cathode ray tubes,
cathodes are continually being improved upon as new applications
with increased demands arise, for example in electron beam
lithography, high-power and high-frequency microwave tubes,
terahertz imaging and electron sources for accelerators. Written by
17 experts in the field, the book presents the latest developments
in cathodes needed for these applications, discussing the state of
the art and addressing future trends.
This book, the first of a two-volume set, focuses on the basic
physical principles of blackbody radiometry and describes
artificial sources of blackbody radiation, widely used as sources
of optical radiation, whose energy characteristics can be
calculated on the base of fundamental physical laws. Following a
review of radiometric quantities, radiation laws, and radiative
heat transfer, it introduces the basic principles of blackbody
radiators design, details of their practical implementation, and
methods of measuring their defining characteristics, as well as
metrological aspects of blackbody-based measurements. Chapters are
dedicated to the effective emissivity concept, methods of
increasing effective emissivities, their measurement and modeling
using the Monte Carlo method, techniques of blackbody radiators
heating, cooling, isothermalization, and measuring their
temperature. An extensive and comprehensive reference source, this
book is of considerable value to students, researchers, and
engineers involved in any aspect of blackbody radiometry.
This thesis focuses on searches for squarks with the ATLAS detector
in "compressed" scenarios where the scalar top is very close in
mass to the lightest supersymmetric particle. These models are
theoretically appealing because the presence of a quasi-degenerate
scalar top enhances the self-annihilation cross-section of the
lightest supersymmetric particle, acting therefore as a regulator
of the dark matter relic density. Two main analyses are presented:
the first is a search for scalar tops decaying to charm quarks. The
identification of jets originating from the charm quark is very
challenging due to its short lifetime. The calibration of tools for
charm-tagging has paved the way to measuring the decay of the Higgs
boson to pairs of charm quarks. The second analysis presented is
the development of a novel technique for reconstructing low
momentum b-hadrons. This tool has enabled the ATLAS collaboration
to explore topologies that were previously inaccessible.
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