Used price: $10.00
Buy one from zShops for: $11.22
List price: $14.95 (that's 30% off!)
Used price: $13.22
Collectible price: $18.00
Buy one from zShops for: $12.51
Used price: $2.00
Collectible price: $3.13
Buy one from zShops for: $3.95
Used price: $16.81
Linking all this is of course the beautiful illustrations of James Field coupled with extensive color and black and white photographs of sundry Roman military gear from both archaeological recoveries and reenactor reconstruction's. Field's plates are wonderfully fluid whether displaying legionaries on mundane guard duty or engaged in desperate close combat. Each plate of course comes with a detailed image summery to allow the reader to identify specific items in the course of their actual use.
All in all, this is a highly recommended work that if not quite in the league of Peter Connoley is nevertheless still well worth the time and expense of any Roman military history buff.
Used price: $3.98
Collectible price: $15.00
Buy one from zShops for: $4.99
An unfortunately problem with what few books there are on doves is that wild and domestic species are often described in the same book. They may be biologically related species but they are so completely different as pets, in terms of their caging, care, and temperament. What I like about this book is that it does make a clear dinstinction between caring for domesticated and wild doves. Another thing I like it that the author describes something of the friendly nature of tame, domesticated doves and what great pets they make. The coverage of wild dove species is somewhat limited but there are better books for that, such as "Doves" by Matthew Vriends.
My only real criticism of the book is that there is still sometimes a lack of clarity as to when the author is describing domestic vs. wild species. Also, I cringe when some photos of domesticated ringneck doves are alternatively labeled "collared doves" and "indian ring doves". It makes it a little confusing as to whether these are all the domesticated "Streptopelia risoria" species or another, wild species, of the same genus.
Both this book and "Doves" by Matthew Vriends have a lot of good information. However, I wish one of them (or someone else) would write a book specifically on the domesticated Ringneck and White Doves. They really deserve a book of their own, that describes both their great pet qualities and their many new color varieties.
Used price: $44.00
Remember, this is not a book about parrots in captivity, its information about birds in the wild. If you don't own a parrot and are thinking about one, this book is a definite help in learning about all the different species that are out there. The more knowledge you have the better it will be when you do decide to pick out that perfect companion parrot for yourself & family. Owning a companion parrot is a lifetime commitment that shouldn't be taken lightly. I know I researched many months before I found the perfect parrot for us. The love you receive in return from your parrot will amaze you. I wish I could give this book more than 5 stars. Highly recommended!
List price: $16.95 (that's 30% off!)
Used price: $11.50
Buy one from zShops for: $11.19
List price: $19.95 (that's 30% off!)
Used price: $9.00
Collectible price: $13.40
Buy one from zShops for: $12.50
The book was not concise.
in the other books the butterflies shown are dead, and i dont like that. I mean, Iam a butterfly lover. I hate that.
This is a beatyfull book and i love it.
List price: $16.50 (that's 30% off!)
Used price: $2.67
Buy one from zShops for: $2.49
The scenarios include dialogues between a teen and friends, teachers, parents or others who would play a role in the situation set forth. The authors later analyze how well the subjects of the dialogues handled the situations in the scenario. The book is very readible and the advice is genarally good, albeit not always in the greatest depth. As a parent and a school board of education member, I find the book useful and recommend it.
Riera and DiPrisco make it clear that there is no way to 'follow-the-dots' and come up with pat answers to the difficult subjects they tackle. Instead, this beautifully written book presents teens in their natural habitats. Real situations are depicted -- ones that anyone can identify with -- but rather than attempting to proscribe behavior, Riera and DiPrisco discuss each topic and scenario in an insightful section called Notes Home that will surely help parents bring a new slant to their thinking. It definitely opened my mind to new approaches.
I highly recommend this book to anyone with a teen -- or a soon-to-be teen. You won't be disappointed.
Collectible price: $91.30
Buy one from zShops for: $44.50
semester course on Intro to Quantum Field Theory.
I also taught the second half of the book two times.
I am still amazed by how well written and enlightening this book
is, and I regard it as a modern classic. After a years
worth of study, the student is really able to dive into research.
They know the Standard Model in enough detail to
perform radiative corrections in the electroweak model, and
where the Feynman rules come from in different gauges.
The book is accessible to experimental and theoretical students
in all areas of physics, and drives home all the essential
points. I wish this book had been around twenty years ago
when I was first trying to learn the material.
The main emphasis of the book is on quantum electrodynamics (QED), the most successful of quantum field theories. The representation and analysis of the physical processes of QED is done via Feynman diagrams, with electron-positron annihilation leading off the discussion. Recognizing that the exact expression for the amplitude of this process is not known, perturbation theory is used to give an approximate representation for it via an infinite series with each term involving successively higher powers of the strength of the coupling between the electrons and photons (i.e. the charge). Each term is represented as a Feynman diagram. This is followed by a discussion of the quantum field theory of the Klein-Gordon field. The authors give one of the best explanations in the literature of why one must deal with the quantization of fields and not particles, the most important one being causality. Canoncial quantization is employed and the Feynman propagator for the Klein-Gordon field is derived. The Dirac field is also quantized using the canonical formalism. The authors show that Klein-Gordon fields obey Bose-Einstein statistics and Dirac fields obey Fermi-Dirac statistics. The all-important Wick's theorem is proven and higher-order Feynman diagrams are discussed. Most importantly, the authors show how to connect these results to experiment via the calculation of cross sections and decay rates. This entails the computation of the S-matrix elements from Feynman diagrams. The authors are very detailed in their elucication of the discussion, and those who have done these calculations know that it is great fun to do so. In addition, these "bread-and-butter" calculations give quantum field theory its ultimate justification in the modern particle accelerator. The discussion on radiative corrections is especially well-written, particularly the section on infrared divergences.
The authors do not entirely neglect the more formal aspects behind quantum field theory, and spend some time discussion renormalization and the amazing Ward-Takahashi identity. This important identity gives one further confidence in the consistency of QED in that is shows that timelike and longitudinal photons can be neglected in the actual calculations. The process of renormalization has been viewed with suspicion by mathematicians, but it has been given a firmer foundation recently using, interestingly, mostly 19th century mathematics. The authors discuss functional methods, and give an example of its use by calculating the photon propagotor. Viewing this as a constrained problem because of gauge invariance they use the Faddeev-Popov gauge fixing condition to obtain the correct results. In addition, they derive the important Schwinger-Dyson equations for QED using functional methods.
Effective field theories are also introduced in the book, with an explicit calculation of the effective action. The authors show the important connection between continuous symmetries and the existence of massless particles (Goldstone's theorem). Their discussion of the renormalization group is very understandable, and they motivate the subject well, by asking why the loop integrals over virtual-particle momenta are always dominated by values on the order of the finite external momenta.
Non-Abelian gauge theories are given a thorough treatment and Wilson loops are introduced as a comparator between gauge transformations at different spacetime points. The quantization of these theories is again done by viewing the quantization problem as a constrained problem, and the famous "Lagrange multlipiers", the Faddeev-Popov ghosts, are introduced. The authors show in detail how their introduction allows the correct Feynman rules to be produced, by showing that the unphysical timelike and longitudinal polarization states of the gauge bosons are cancelled by these fields. The BRST symmetry is discussed as a formal device to to this cancellation. The omit though how the Ward identities are derived from BRST symmetry.
The authors give the best explanation in the literature of asymptotic freedom by showing the effect of vacuum fluctuations on the Coulomb field of a SU(2) gauge theory.
The important operator product expansion is treated in the context of the Callan-Symanzik equation in quantum chromodynamics. It is applied to the deep inelastic scattering and electron-positron annihilation. Dispersion relations make their appearance here.
The authors also discuss anomalies and motivate the subject by analyzing the axial current in two-dimensional massless QED. The axial current is shown not to be conserved in the presence of an electromagnetic field, and they conclude that gauge invariance and conservation of axial currents in this theory cannot both be simultaneously satisfied. This is generalized to axial currents in four dimensions and the authors derive the famous Adler-Bell-Jackiw anomalies. The implications of anomalies for gauge theories are discussed along with observable consequencies.
The (mysterious) Higgs mechanism is also discussed and compared to the situation in superconductivity. To view it in terms of superconductivity I think gives it the most plausible and intuitive justification. Understanding the Higgs mechanism is a usual stumbling-block for newcomers to gauge theories, and the authors do a fair job here. The quantization of spontaneously broken gauge theories is then carried out, with emphasis on the Goldstone boson equivalence theorem. A brief discussion of the future of quantum field theory ends the book.
When reading this book, and others on quantum field theory, I am always amazed at the degree to which it works, and its elegance, despite the fact that it really is a collection of ad hoc strategies and sophisticated guesswork. One gets the impression that there is something profound behind the scenes, still waiting to be discovered, and which will be able to shed light on the major unsolved problem of quantum field theory: the existence of a bound state.
The book deals with subjects such as finances for writers, dealing with the day-to-day routine of writing, and even has hints about what to do if your writing career doesn't go as far or as fast you'd like.
Although he does touch on other ways for a writer to pull in income, this book deals mainly with writing for publication. Writing for business is only mentioned as an additional way to make money but does not go into much detail as to how to get started in business/commercial writing.
Since commercial writing (writing for business and industry) is where the money is, and if you don't mind writing things that don't give you a byline, you may want to consider the "classics" on freelance writing by Bly or Bowerman in addition to or instead of this book.
However, this book is another fine introduction to the sometimes-difficult field of freeelance writing and you will benefit from it should you decide to buy it.