A new view on planet formation

The standard picture of planet formation posits that giant gas planets are over-grown rocky planets massive enough to attract enormous gas atmospheres. It has been shown recently that the opposite point of view is physically plausible: the rocky terrestrial planets are former giant planet embryos dried of their gas "to the bone" by the influences of the parent star. Here we provide a brief overview of this "Tidal Downsizing" hypothesis in the context of the Solar System structure.Comment: contributed talk to the IAU 276; 4 pages and 1 figur

Variations of growth parameters in transplanted Aman rice (cv. BRRI dhan39) in response to plant spacing and fertilizer management

The experiments were carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh during June to December 2015 to investigate the effect of spacing and fertilizer management on the growth parameters of transplant Aman rice cv. BRRI dhan39. The experiment comprised of five spacing’s viz. 25 cm × 5 cm, 25 cm × 10 cm, 25 cm × 15 cm, 25 cm × 20 cm, 25 cm × 25 cm, and four fertilizer treatments viz. no manure and no fertilizer (control), recommended dose of chemical fertilizer (80-60-40 kg N, P2O5, K2O ha-1,respectively + 60 kg ha-1 gypsum + 10 kg ha-1 ZnSO4), 75% recommended dose of inorganic fertilizer + cow dung at 5 t ha-1,75% recommended dose of inorganic fertilizer + poultry manure @ 2.5 t ha-1. The highest and lowest plant height was found in spacing 25 cm × 15 cm, and 25 cm × 5 cm, respectively at all dates of observations. Spacing 25 cm × 15 cm, produced the highest number of tillers hill-1 at 80 DAT. Leaf area index (LAI) and total dry matter (TDM) hill-1 were the highest in 25 cm × 15 cm spacing and lowest in 25 cm × 5 cm spacing. The highest plant height, LAI and total TDM hill-1 were recorded in 75% recommended dose of inorganic fertilizer + cow dung at 5 t ha-1 and the lowest values were observed in control treatment. In case of interaction, the highest number of tillers hill-1, leaf area index and total dry matter hill-1 were obtained in spacing 25 cm × 15 cm fertilized with 75% recommended dose of inorganic fertilizers + cow dung at 5 t ha-1.Therefore, 25 cm × 15 cm spacing combined with 75% recommended dose of inorganic fertilizers + cow dung at 5 t ha-1 appeared as the promising practice in transplant Aman rice cv. BRRI dhan39 cultivation in terms of growth parameters

Impact of row arrangements, age of tiller seedlings and number of tiller seedlings hill-1 on the growth performance of transplanted Aman rice (cv. BR23)

The experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to see the effect of row arrangements, age of tiller seedlings and number of tiller seedlings hill-1 on growth of transplant Aman rice (cv. BR23). The experiment comprised three row arrangements viz. single, double and triple row; two ages of tiller seedling viz. 25 and 35 days and three levels of number of tiller seedlings hill-1 viz., 2, 4 and 6 tiller seedlings hill-1. The effect of row arrangement, age of tiller seedlings and number of tiller seedlings hill-1 were significant on plant height, number of leaves hill-1, number of total tillers hill-1, leaf dry weight, stem dry weight and total dry weight. The tallest plants at 70 DAT, the highest number of leaves and leaf dry weight were found at 25, 40, 55 and 70 DAT in single row arrangement which was as good as double row arrangement while shorter plant and the lowest number of leaves hill-1 were found in triple row arrangement. The highest stem and total dry matter production hill-1 were recorded in triple row arrangement and the lowest were found in single row arrangement. Wider spacing significantly increased plant height, total tiller production hill-1, leaf production hill-1and leaf dry matter production while closer spacing of triple rows enhance stem and total dry matter production hill-1. Transplanted Aman rice (BR23) can be grown in single rows for the highest plant height, more tiller production, leaf production and leaf dry matter production hill-1. In case of total dry matter production cv. BR23 can be grown in triple rows by transplanting 35-day old seedlings with 6 tiller seedlings hill-1

Ytterbium doped nano-crystalline optical fiber for reduced photodarkening

We report suppression of photodarkening in Yb-doped nano-crystalline fibers in silica host. The photodarkening induced loss reduced by 20 times compared to Yb-doped aluminosilicate fibers. The laser efficiency of the nano-crystalline fiber was 79%

Toxicity of some organic biocides to exotic carp fingerlings Hypophthalmichthys molitrix (C and V)

A bioassay study was conducted using three organic pesticides to determine their comparative toxicity to fingerlings of Hypophthalmichthys molitrix. There was wide variation in the toxicity of different pesticides with 24 hr LC sub(50) values ranging from 0.000403 to 0.294 mg/l. Endosulfan appeared to be the most toxic, whereas BHC was the least

Effect of stocking density on the production of common carp (Cyprinus carpio Lin.) in cages at Kaptai lake, Bangladesh

Growth, survival and food conversion ratio (FCR) of Cyprinus carpio in cages at different stocking density were studied in Kaptai lake. Fingerlings of common carp (12.47 ± 4.29 g) were stocked at 25/m2 , 50/m2 and 75/m2 each with replication in six floating net cages each of Sm x Sm x 4m and reared for 240 days. The growth rate was inversely related to the stocking density with the mean weights of 325.5 ± 11.74 g, 268.99± 8.44 g and 167.0 ± 11.66 g at low, medium and high densities, respectively. At harvest, standing crop biomass averaged 7 .82, 12.83 and 11.58 kg with the survival of 98.9%, 97.6% and 94.4% and food conversion ratios of 4.51, 3.82 and 4.21 for the above three densities, respectively. Weight gain and production at density 25 fish/m 2 were significantly different (p< 0.01) from other two densities. Water quality was not affected in the cages having different stocking densities

The Glauber model and the heavy ion reaction cross section

We reexamine the Glauber model and calculate the total reaction cross section as a function of energy in the low and intermediate energy range, where many of the corrections in the model, are effective. The most significant effect in this energy range is by the modification of the trajectory due to the Coulomb field. The modification in the trajectory due to nuclear field is also taken into account in a self consistent way. The energy ranges in which particular corrections are effective, are quantified and it is found that when the center of mass energy of the system becomes 30 times the Coulomb barrier, none of the trajectory modification to the Glauber model is really required. The reaction cross sections for light and heavy systems, right from near coulomb barrier to intermediate energies have been calculated. The exact nuclear densities and free nucleon-nucleon (NN) cross sections have been used in the calculations. The center of mass correction which is important for light systems, has also been taken into account. There is an excellent agreement between the calculations with the modified Glauber model and the experimental data. This suggests that the heavy ion reactions in this energy range can be explained by the Glauber model in terms of free NN cross sections without incorporating any medium modification.Comment: RevTeX, 21 pages including 9 Postscript figures, submitted to Phys. Rev.