Reynolds stresses and mean fields generated by pure waves: applications to shear flows and convection in a rotating shell

A general reformulation of the Reynolds stresses created by two-dimensional waves breaking a translational or a rotational invariance is described. This reformulation emphasizes the importance of a geometrical factor: the slope of the separatrices of the wave flow. Its physical relevance is illustrated by two model systems: waves destabilizing open shear flows; and thermal Rossby waves in spherical shell convection with rotation. In the case of shear-flow waves, a new expression of the Reynolds–Orr amplification mechanism is obtained, and a good understanding of the form of the mean pressure and velocity fields created by weakly nonlinear waves is gained. In the case of thermal Rossby waves, results of a three-dimensional code using no-slip boundary conditions are presented in the nonlinear regime, and compared with those of a two-dimensional quasi-geostrophic model. A semi-quantitative agreement is obtained on the flow amplitudes, but discrepancies are observed concerning the nonlinear frequency shifts. With the quasi-geostrophic model we also revisit a geometrical formula proposed by Zhang to interpret the form of the zonal flow created by the waves, and explore the very low Ekman-number regime. A change in the nature of the wave bifurcation, from supercritical to subcritical, is found

Bistability and hysteresis of dipolar dynamos generated by turbulent convection in rotating spherical shells

Bistability and hysteresis of magnetohydrodynamic dipolar dynamos generated by turbulent convection in rotating spherical fluid shells is demonstrated. Hysteresis appears as a transition between two distinct regimes of dipolar dynamos with rather different properties including a pronounced difference in the amplitude of the axisymmetric poloidal field component and in the form of the differential rotation. The bistability occurs from the onset of dynamo action up to about 9 times the critical value of the Rayleigh number for onset of convection and over a wide range of values of the ordinary and the magnetic Prandtl numbers including the value unity

Sterile acellular dermal collagen as a treatment for rippling deformity of breast.

Prosthetic implants are frequently used for breast augmentation and breast reconstruction following mastectomy. Unfortunately, long-term aesthetic results of prosthetic breast restoration may be hindered by complications such as rippling, capsular contracture, and implant malposition. The advent of use of acellular dermal matrices has greatly improved the outcomes of prosthetic breast reconstruction. We describe a case of rippling deformity of breast that was treated using an acellular dermal matrix product, AlloMax. The patient presented with visible rippling of bilateral prosthetic breast implants as well as significant asymmetry of the breasts after multiple excisional biopsies for right breast ductal carcinoma in situ. A 6 × 10 cm piece of AlloMax was placed on the medial aspect of each breast between the implant and the skin flap. Follow-up was performed at 1 week, 3 months, and 1 year following the procedure. The patient recovered well from the surgery and there were no complications. At her first postoperative follow-up the patient was extremely satisfied with the result. At her 3-month and 1-year follow-up she had no recurrence of her previous deformity and no new deformity

Aerobee 150 structural and aerodynamic pitch coupling

Aerobee 150 structural and aerodynamic pitch coupling failure analysis based on flight performance data reductio

Specific Helps on Everyday Teaching Problems - Address Given at State Home Economics Convention

The health ideal has been sold to the public. It has found ·its way into most of our schools. The same ideal has been caught by the general public and we find much of the current advertising recognizing this fact. Fresh Air Brings Refreshing Sleep was the advertisement for a special screen I found in one of this month\u27s magazines. Science Speaks High Authorities Prove Remarkable Health Value of a certain gelatin. A peach and fig company claim for their product Health Protection for the Homes of America. A sleeping garment company insists in large letters that your child\u27s health depends on the kind of sleeping garment he wears. The public is sold to the idea of health

I Wonder What College Is Like?

College? Only four months more until you, high school senior, will be starting off to college. During every one of these sixteen coming weeks you will be wondering, wondering what college is like. Perhaps one of last year\u27s seniors from your home town has been in college this year and she has told you all about it. But somehow your imagination can\u27t keep pace with her description and you find yourself wondering about registration, about this new life in the dormitory, about the new friends you are to make, whether you will be lucky enough to have an attractive roommate, and if you must study very hard at college

New Health Ways Make Happy Days

Not going to eat your dessert, Miss \u27Williams? inquired our hostess. Miss Williams looked longingly at the concoct· ion or whipped cream, sugar, nuts and cake. Surely it was fit food for the gods and it must have taken hours to prepare. There was some evident disappointment on her face. No, it can\u27t be done, sighed Miss Williams with more evident disappoint in her voice, but I can\u27t go the round of parties and eat all the tempting goodies. I tell you I gained a pound last week and I will not go back to my old weight

Whole Wheat Bread for Health

Mrs. W. makes the most wonderful bread, it\u27s so white and light and has the best flavor, remarked an admiring neighbor to a friend. I wish I could make bread like that

A New Book on Meal Planning and Table Service

Do you know that Miss Bailey\u27s book is off the press? was an enthusiastic query a few days ago. Those who knew Miss Bailey personally were sure that her enthusiasm would reflect in the pages of her book; others were anxious for a bound copy of the lectures and work offered in her classes