Numerical simulation of heavy fermions in an SU(2)_L x SU(2)_R symmetric Yukawa model

An exploratory numerical study of the influence of heavy fermion doublets on the mass of the Higgs boson is performed in the decoupling limit of a chiral $\rm SU(2)_L \otimes SU(2)_R$ symmetric Yukawa model with mirror fermions. The behaviour of fermion and boson masses is investigated at infinite bare quartic coupling on $4^3 \cdot 8$, $6^3 \cdot 12$ and $8^3 \cdot 16$ lattices. A first estimate of the upper bound on the renormalized quartic coupling as a function of the renormalized Yukawa-coupling is given.Comment: 15 pp + 11 Figures appended as Postscript file

Cold storage investigations with wealthy apples: Fifth progress report

1. Wealthy apples grown in northern Iowa when properly ripened and carefully handled kept well in cold storage until late in February. 2. Apple-scald does not appear to be a factor in the storage of Wealthy apples on well ripened fruit. 3. Soft-scald was most abundant on immature fruit and especially on delayed stored immature fruit. Soft-scald was practically eliminated by immediate storage. This held true with fruit picked in either an immature or in a mature condition. 4. Oiled wraps practically controlled apple-scald on Wealthy and in some cases apparently reduced the amount of soft-scald, but the results with the latter cannot be taken as conclusive. 5. The percentage of Wealthy affected with rots resulting from skin injuries was 11 percent. Approximately seven percent of these rots resulted from mechanical injuries and four percent from growth cracks

Soggy breakdown of apples and Its control by storage temperature

1. Soggy breakdown, a non-parasitic disease which develops at low temperatures, is described. 2. Soggy breakdown is distinguished from internal breakdown and from physiological decay or the breakdown which accompanies senescence. The name mealy breakdown is suggested for the latter. 3. Grimes and Wealthy apples have been found to be very susceptible to soggy breakdown, while Jonathan, Arkansas, Willow and Northwestern Greening appear immune to the disease. 4. The initial appearance of soggy breakdown on Grimes in cold storage occurred during the early part of December. 5. Differences of 2° or 4° F. in cold storage temperatures markedly affected the development of the disease. 6. No serious amount of soggy breakdown occurred on the fruit stored at 36° F., or on fruit held in common storage. The disease did not appear in common storage. 7. Soggy breakdown developed most seriously at 30° F., as compared to its development at 32 °, 34° and 36° F. The most satisfactory temperature for the storage of Grimes was found to be 36° F. 8. When stored immediately after picking, late picked fruit was more susceptible than early picked. 9. Delayed storage materially increased the susceptibility to soggy breakdown. The influence of delayed storage, however, appears to be linked with the time of picking. 10. Exposure of the fruit to free circulation of the storage room atmosphere prevented the development of soggy breakdown on delayed storage fruit during one storage season, and caused visible shriveling of the fruit. 11. Direct access of the fruit to air during delayed storage did not reduce development of the disease in storage. 12. Evidence obtained suggests that apples become susceptible to soggy breakdown after certain periods of exposure to ordinary temperatures. 13. Soggy breakdown appeared to be more serious some years than others. 14. Grimes from the Wenatchee apple district of Washington and those from central Michigan were as susceptible to soggy breakdown as Grimes from Iowa. 15. Grimes in commercial cold storage developed as much soggy breakdown as those at the same temperature in experimental storage. 16. The quality, condition and attractiveness of Grimes, stored at 36° F., were superior to those stored at the lower temperatures. 17. Grimes stored at 36° F. softened only slightly more than those at lower temperatures. 18. An increase in the tendency to apple-scald in Grimes, due to a slightly higher storage temperature. was successfully averted by the use of oiled paper wraps. 19. With well graded, high quality fruit, the increase in loss due to apple rot fungi at 36° F. was insignificant

Apple storage investigations fourth progress report

This is the fourth report* of the apple storage investigations begun in 1906 by the Pomology Section of the Iowa Agricultural Experiment Station. The report embodies the results of investigations dealing mainly with the development and control of such storage diseases as Jonathan-spot, apple-scald and internal breakdown. The investigations are divided into two parts. Part I deals with the development and control of the storage diseases, Jonathan-spot and soft-scald on the Jonathan apple. Part II includes studies on the development and control of apple-scald and internal breakdown and the effect of certain odorous substances on apples. The report embodies the results of investigations on the keeping quality of apples in storage as affected by varying treatments in the orchard, as time of picking, time of storing and soil cultural methods. Various storage conditions such as temperature, humidity, and aeration have been considered. Particular attention has been given to different types of apple wraps. The keeping quality of Jonathan apples has been compared in cold and common storage

Certain physical and chemical changes of Grimes Apples during ripening and storage pr

These studies of changes in Grimes Apples, incident to ripening and storage, include rate of softening, increase in size, color changes of fruit and seeds, other common tests used by the growr to determine time of picking, and chemical analyses of changes within the apple

Functional diseases of the apple in storage

A systematic study of the storage diseases of apples includes the consideration of two general groups: (a) the functional, and (b) the parasitic diseases. Although most kinds of parasitic diseases are seldom found on good grades of apples, occasionally some of these escape inspection and develop considerably on ripe, fruit in storage. The fruit grower who is concerned with producing sound fruit is familiar with such parasitic diseases as apple scab, apple blotch and cedar-apple rust. The fruit dealer, storage operator and consumer, on the other hand, more frequently come in contact with the functional diseases such as Jonathan spot, apple scald, bitter pit and breakdown

Mass Spectrum and Bounds on the Couplings in Yukawa Models With Mirror-Fermions

The $\rm SU(2)_L\otimes SU(2)_R$ symmetric Yukawa model with mirror-fermions in the limit where the mirror-fermion is decoupled is studied both analytically and numerically. The bare scalar self-coupling $\lambda$ is fixed at zero and infinity. The phase structure is explored and the relevant phase transition is found to be consistent with a second order one. The fermionic mass spectrum close to that transition is discussed and a first non-perturbative estimate of the influence of fermions on the upper and lower bounds on the renormalized scalar self-coupling is given. Numerical results are confronted with perturbative predictions.Comment: 7 (Latex) page

Geklimatiseerde dekstal opgestart!

In drie dekafdelingen in Raalte is onderzoek opgestart naar de mogelijkheden van recirculatie van stallucht, de effecten van klimaat op de productiviteit van zeugen en het effect van dikkere isolatie op het stalklimaat

New mutations at the imprinted Gnas cluster show gene dosage effects of Gsα in postnatal growth and implicate XLαs in bone and fat metabolism, but not in suckling

The imprinted Gnas cluster is involved in obesity, energy metabolism, feeding behavior, and viability. Relative contribution of paternally expressed proteins XLαs, XLN1, and ALEX or a double dose of maternally expressed Gsα to phenotype has not been established. In this study, we have generated two new mutants (Ex1A-T-CON and Ex1A-T) at the Gnas cluster. Paternal inheritance of Ex1A-T-CON leads to loss of imprinting of Gsα, resulting in preweaning growth retardation followed by catch-up growth. Paternal inheritance of Ex1A-T leads to loss of imprinting of Gsα and loss of expression of XLαs and XLN1. These mice have severe preweaning growth retardation and incomplete catch-up growth. They are fully viable probably because suckling is unimpaired, unlike mutants in which the expression of all the known paternally expressed Gnasxl proteins (XLαs, XLN1 and ALEX) is compromised. We suggest that loss of ALEX is most likely responsible for the suckling defects previously observed. In adults, paternal inheritance of Ex1A-T results in an increased metabolic rate and reductions in fat mass, leptin, and bone mineral density attributable to loss of XLαs. This is, to our knowledge, the first report describing a role for XLαs in bone metabolism. We propose that XLαs is involved in the regulation of bone and adipocyte metabolism

A Measurement of the Cosmic Microwave Background Damping Tail from the 2500-square-degree SPT-SZ survey

We present a measurement of the cosmic microwave background (CMB) temperature power spectrum using data from the recently completed South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. This measurement is made from observations of 2540 deg$^2$ of sky with arcminute resolution at $150\,$GHz, and improves upon previous measurements using the SPT by tripling the sky area. We report CMB temperature anisotropy power over the multipole range $650<\ell<3000$. We fit the SPT bandpowers, combined with the seven-year Wilkinson Microwave Anisotropy Probe (WMAP7) data, with a six-parameter LCDM cosmological model and find that the two datasets are consistent and well fit by the model. Adding SPT measurements significantly improves LCDM parameter constraints; in particular, the constraint on $\theta_s$ tightens by a factor of 2.7. The impact of gravitational lensing is detected at $8.1\, \sigma$, the most significant detection to date. This sensitivity of the SPT+WMAP7 data to lensing by large-scale structure at low redshifts allows us to constrain the mean curvature of the observable universe with CMB data alone to be $\Omega_k=-0.003^{+0.014}_{-0.018}$. Using the SPT+WMAP7 data, we measure the spectral index of scalar fluctuations to be $n_s=0.9623 \pm 0.0097$ in the LCDM model, a $3.9\,\sigma$ preference for a scale-dependent spectrum with $n_s<1$. The SPT measurement of the CMB damping tail helps break the degeneracy that exists between the tensor-to-scalar ratio $r$ and $n_s$ in large-scale CMB measurements, leading to an upper limit of $r<0.18$ (95%,C.L.) in the LCDM+$r$ model. Adding low-redshift measurements of the Hubble constant ($H_0$) and the baryon acoustic oscillation (BAO) feature to the SPT+WMAP7 data leads to further improvements. The combination of SPT+WMAP7+$H_0$+BAO constrains $n_s=0.9538 \pm 0.0081$ in the LCDM model, a $5.7\,\sigma$ detection of $n_s < 1$, ... [abridged]Comment: 21 pages, 10 figures. Replaced with version accepted by ApJ. Data products are available at http://pole.uchicago.edu/public/data/story12