|
Showing 1 - 11 of
11 matches in All Departments
Twelve of Llewellyn's top authors have collaborated to introduce
you to a dozen new age relaxation techniques that can positively
impact all areas of your life. Pulling from both scientific and
spiritual methods, these expert authors introduce you to guided
meditations, visualizations, and other simple practices so you can
achieve a state of calm, collected bliss. Through fun,
conversational essays, this book explores a wide range of topics,
including the power of chakras, bedtime rituals, listening to your
body, and autonomous sensory meridian responses (ASMR). You will
learn about aromatherapy from Gail Bussi, the vagus nerve from
Cyndi Dale, mindfulness from Melanie Klein, and more. Whether your
need is for yourself, a corporate retreat, or a therapy group,
Finding Your Calm helps you tune into your innate intuition and
find the right modality for any moment.
This new addition to a popular series recognises the fact that New
Zealand is a fascinating arena of study for anyone with an interest
in insect life, be it casual or academic. The country's long
isolation from other land masses has led to a flowering of
remarkable species including the world's heaviest insect (giant
weta) and largest weevil (giraffe weevil). Over the years, these
have been joined by insects introduced accidentally or deliberately
from overseas, sometimes with destructive consequences for New
Zealand's ecosystem. Featuring more than 170 entries, the book will
appeal to walkers, nature lovers, educationalists, and
photographers wishing to identify their subjects.
The Contributions to the Sociology of Language series features
publications dealing with sociolinguistic theory, methods, findings
and applications. It addresses the study of language in society in
its broadest sense, as a truly international and interdisciplinary
field in which various approaches - theoretical and empirical -
supplement and complement each other. The series invites the
attention of scholars interested in language in society from a
broad range of disciplines - anthropology, education, history,
linguistics, political science, and sociology. To discuss your book
idea or submit a proposal, please contact Natalie Fecher.
The topic of lattice quantum spin systems (or 'spin systems' for
short) is a f- cinating branch of theoretical physics and one of
great pedigree, although many
importantquestionsstillremaintobeanswered.
The'spins'areatomic-sizedm-
netsthatarelocalisedtopointsonalatticeandtheyinteractviathelawsofquantum
mechanics.
Thisintrinsicquantummechanicalnatureandthelarge(usuallyeff-
tivelyin
nite)numberofspinsleadstostrikingresultswhichcanbequitedifferent
fromclassicalresultsandareoftenunexpectedandindeedcounter-intuitive.
Spinsystemsconstitutethebasicmodelsofquantummagneticinsulatorsandso
arerelevanttoawholehostofmagneticmaterials.
Furthermore,theyareimportant
asprototypicalmodelsofquantumsystemsbecausetheyareconceptuallysimple
and yet stilldemonstrate surprisingly rich physics. Low dimensional
systems, in
2Dandespecially1D,havebeenparticularlyfruitfulbecausetheirsimplicityhas
enabledexactsolutionstobefoundwhichstillcontainmanyhighlynon-trivialf-
tures.
Spinsystemsoftendemonstratephasetransitionsandsowecanusethemto
studytheinterplayofthermalandquantum
uctuationsindrivingsuchtransitions.
Ofcoursetherearemanycasesinwhichwecan ndnoexactsolutionandinthese
casestheycanbeusedasatestinggroundforapproximatemethodsofmodern-day
quantummechanics. Thesequantumsystemsthusprovideagreatvarietyofint-
estinganddif cultchallengestothemathematicianorphysicalscientist.
Thisbookwaspromptedbyaseriesoftalksgivenbyoneoftheauthors(JBP)at
asummerschoolinJyvaskyla,Finland.
Thesetalksprovidedadetailedviewofhow
onegoesaboutsolvingthebasicproblemsinvolvedintreatingandunderstanding
spinssystemsatzerotemperature.
Itwasthislevelofdetail,missingfromothertexts
inthearea,thatpromptedtheotherauthor(DJJF)tosuggestthattheselecturesbe
broughttogetherwithsupplementarymaterialinordertoprovideadetailedguide
whichmightbeofuse,perhapstoagraduatestudentstartingworkinthisarea.
Thebookisorganisedintochaptersthatdeal rstlywiththenatureofquantum
mechanicalspinsandtheirinteractions.
Thefollowingchaptersthengiveadetailed
guidetothesolutionoftheHeisenbergandXYmodelsatzerotemperatureusing
theBetheAnsatzandtheJordan-Wignertransformation,respectively.
Approximate methodsarethenconsideredfromChap.
7onwards,dealingwithspin-wavet-
oryandnumericalmethods(suchasexactdiagonalisationsandMonteCarlo).
The
coupledclustermethod(CCM),apowerfultechniquethathasonlyrecentlybeen
vii viii Preface appliedtospinsystemsisdescribedinsomedetail. The
nalchapterdescribesother
work,someofitveryrecent,toshowsomeofthedirectionsinwhichstudyofthese
systemshasdeveloped.
Theaimofthetextistoprovideastraightforwardandpracticalaccountofall
of the steps involved in applying many of the methods used for
spins systems, especiallywherethisrelatestoexactsolutionsforin
nitenumbersofspinsatzero temperature.
Inthisway,wehopetoprovidethereaderwithinsightintothesubtle
natureofquantumspinproblems. Manchester,UK JohnB. Parkinson
January2010 DamianJ. J. Farnell Contents 1 Introduction ...1
References...5 2 Spin Models...7 2. 1 SpinAngularMomentum...7 2. 2
CoupledSpins...10 1 2. 3 TwoInteractingSpin- 'areatomic-sizedm-
netsthatarelocalisedtopointsonalatticeandtheyinteractviathelawsofquantum
mechanics.
Thisintrinsicquantummechanicalnatureandthelarge(usuallyeff-
tivelyin
nite)numberofspinsleadstostrikingresultswhichcanbequitedifferent
fromclassicalresultsandareoftenunexpectedandindeedcounter-intuitive.
Spinsystemsconstitutethebasicmodelsofquantummagneticinsulatorsandso
arerelevanttoawholehostofmagneticmaterials.
Furthermore,theyareimportant
asprototypicalmodelsofquantumsystemsbecausetheyareconceptuallysimple
and yet stilldemonstrate surprisingly rich physics. Low dimensional
systems, in
2Dandespecially1D,havebeenparticularlyfruitfulbecausetheirsimplicityhas
enabledexactsolutionstobefoundwhichstillcontainmanyhighlynon-trivialf-
tures.
Spinsystemsoftendemonstratephasetransitionsandsowecanusethemto
studytheinterplayofthermalandquantum
uctuationsindrivingsuchtransitions.
Ofcoursetherearemanycasesinwhichwecan ndnoexactsolutionandinthese
casestheycanbeusedasatestinggroundforapproximatemethodsofmodern-day
quantummechanics. Thesequantumsystemsthusprovideagreatvarietyofint-
estinganddif cultchallengestothemathematicianorphysicalscientist.
Thisbookwaspromptedbyaseriesoftalksgivenbyoneoftheauthors(JBP)at
asummerschoolinJyvaskyla,Finland.
Thesetalksprovidedadetailedviewofhow
onegoesaboutsolvingthebasicproblemsinvolvedintreatingandunderstanding
spinssystemsatzerotemperature.
Itwasthislevelofdetail,missingfromothertexts
inthearea,thatpromptedtheotherauthor(DJJF)tosuggestthattheselecturesbe
broughttogetherwithsupplementarymaterialinordertoprovideadetailedguide
whichmightbeofuse,perhapstoagraduatestudentstartingworkinthisarea.
Thebookisorganisedintochaptersthatdeal rstlywiththenatureofquantum
mechanicalspinsandtheirinteractions.
Thefollowingchaptersthengiveadetailed
guidetothesolutionoftheHeisenbergandXYmodelsatzerotemperatureusing
theBetheAnsatzandtheJordan-Wignertransformation,respectively.
Approximate methodsarethenconsideredfromChap.
7onwards,dealingwithspin-wavet-
oryandnumericalmethods(suchasexactdiagonalisationsandMonteCarlo).
The
coupledclustermethod(CCM),apowerfultechniquethathasonlyrecentlybeen
vii viii Preface appliedtospinsystemsisdescribedinsomedetail. The
nalchapterdescribesother
work,someofitveryrecent,toshowsomeofthedirectionsinwhichstudyofthese
systemshasdeveloped.
Theaimofthetextistoprovideastraightforwardandpracticalaccountofall
of the steps involved in applying many of the methods used for
spins systems, especiallywherethisrelatestoexactsolutionsforin
nitenumbersofspinsatzero temperature.
Inthisway,wehopetoprovidethereaderwithinsightintothesubtle
natureofquantumspinproblems. Manchester,UK JohnB. Parkinson
January2010 DamianJ. J. Farnell Contents 1 Introduction ...1
References...5 2 Spin Models...7 2. 1 SpinAngularMomentum...7 2. 2
CoupledSpins...10 1 2. 3 TwoInteractingSpin- 's...11 2 2. 4
CommutatorsandQuantumNumbers...14 2. 5 PhysicalPicture...16 2. 6 In
niteArraysofSpins...16 1 2. 7 1DHeisenbergChainwith S =
andNearest-Neighbour 2 Interaction...18 References...19 1 3 Quantum
Treatment of the Spin- Chain...21 2 3. 1 GeneralRemarks...21 3. 2
AlignedState...22 3. 3 SingleDeviationStates...23 3. 4
TwoDeviationStates...27 3. 4. 1 FormoftheStates ...33 3. 5
ThreeDeviationStates...36 Z N 3. 5. 1 BetheAnsatzforS = ?3...36 T 2
3. 6 StateswithanArbitraryNumberofDeviations...37 Reference...38 4
The Antiferromagnetic Ground State ...39 4. 1
TheFundamentalIntegralEquation...39 4. 2
SolutionoftheFundamentalIntegralEquation...43 4. 3
TheGroundStateEnergy...45 References...47 ix x Contents 5
Antiferromagnetic Spin Waves ...49 5. 1 TheBasicFormalism ...49 5.
2 MagneticFieldBehaviour ...
This is a reproduction of a book published before 1923. This book
may have occasional imperfections such as missing or blurred pages,
poor pictures, errant marks, etc. that were either part of the
original artifact, or were introduced by the scanning process. We
believe this work is culturally important, and despite the
imperfections, have elected to bring it back into print as part of
our continuing commitment to the preservation of printed works
worldwide. We appreciate your understanding of the imperfections in
the preservation process, and hope you enjoy this valuable book.
Spinoza's Ethics is a classic philosophy text but it is also one of the most difficult to understand. This latest text in the Oxford Philosophical Texts series includes a new, lucid translation of Ethics in which Parkinson provides a comprehensive guide to the understanding of Spinoza's work. An extensive introduction includes a short biography of Spinoza himself; the form of his writing including his own particular uses of definitions; an introductory guide through the philosophy of Ethics; and a summary of the contents of Ethics itself. Further aids include a glossary of terms, notes to the text, and notes to the translation.
Magical realism is often regarded as a regional trend, restricted
to the Latin American writers who popularized it as a literary
form. In this critical anthology, the first of its kind, editors
Lois Parkinson Zamora and Wendy B. Faris show magical realism to be
an international movement with a wide-ranging history and a
significant influence among the literatures of the world. In essays
on texts by writers as diverse as Toni Morrison, Günter Grass,
Salman Rushdie, Derek Walcott, Abe Kobo, Gabriel García Márquez,
and many others, magical realism is examined as a worldwide
phenomenon. Presenting the first English translation of Franz
Roh’s 1925 essay in which the term magical realism was coined, as
well as Alejo Carpentier’s classic 1949 essay that introduced the
concept of lo real maravilloso to the Americas, this anthology
begins by tracing the foundations of magical realism from its
origins in the art world to its current literary contexts. It
offers a broad range of critical perspectives and theoretical
approaches to this movement, as well as intensive analyses of
various cultural traditions and individual texts from Eastern
Europe, Asia, North America, Africa, the Caribbean, and Australia,
in addition to those from Latin America. In situating magical
realism within the expanse of literary and cultural history, this
collection describes a mode of writing that has been a catalyst in
the development of new regional literatures and a revitalizing
force for more established narrative traditions—writing
particularly alive in postcolonial contexts and a major component
of postmodernist fiction.
|
You may like...
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
|