scholarly journals Studies on the Short Period Cultivation of Direct Sown Rice Plant : 2. Productivity of direct sown rice plant under short period cultivation in different seasons.

1965 ◽  
Vol 33 (3) ◽  
pp. 209-213
Author(s):  
Yoshiyuki KOMATSU ◽  
Norimitsu ISHIKURA ◽  
Isamu KAWASAKI
Keyword(s):  
Rice Plant ◽  
Short Period ◽  
Different Seasons

scholarly journals Dynamics and Spatial Shape of Short-Period Meteoroid Streams

1989 ◽  
Vol 8 ◽  
pp. 287-293 ◽  
Author(s):  
P.B. Babadzhanov ◽  
Yu.V. Obrubov
Keyword(s):  
Early Stage ◽  
Meteor Showers ◽  
Meteoroid Streams ◽  
Small Thickness ◽  
Short Period ◽  
Stream Width ◽  
Different Seasons ◽  
Spatial Shape

AbstractAt the early stage of evolution the meteoroid streams may be considered as elliptical rings of relatively small thickness. The influence of planetary perturbations can essentially increase the stream width and its thickness. As a result one stream may produce several couples of meteor showers active in different seasons of the year. 22 short-period meteoroid streams under review may theoretically produce 104 meteor showers. The existence of 67 is confirmed by observations.

scholarly journals Rainfall and human activity impacts on soil losses and rill erosion in vineyards (Ruwer Valley, Germany)

Solid Earth ◽  
2015 ◽  
Vol 6 (3) ◽  
pp. 823-837 ◽  
Author(s):  
J. Rodrigo Comino ◽  
C. Brings ◽  
T. Lassu ◽  
T. Iserloh ◽  
J. M. Senciales ◽  
...  
Keyword(s):  
Human Activity ◽  
Soil Loss ◽  
Soil Analysis ◽  
Rill Erosion ◽  
Erosion Rates ◽  
Short Period ◽  
Different Seasons ◽  
Steep Slopes ◽  
The Village ◽  
Experimental Plots

Abstract. Vineyards are one of the eco-geomorphological systems most conditioned by human activity in Germany. The vineyards of the Ruwer Valley (Germany) are characterized by high soil erosion rates and rill problems on steep slopes (between 23 and 26°) caused by the increasingly frequent heavy rainfall events as well as deterioration due to incorrect land use managements. The objective of this paper is to determine and to quantify the hydrological and erosive phenomena in one vineyard in Germany during different seasons and under different management conditions (before, during and after vintage). For this purpose, a combined methodology was applied. Climatic (rainfall depth distributions and return periods), pedological (soil analysis and classification), geomorphological (sediment movements and rills evolution) and biological (botanic marks on the vines) variables were used on the two experimental plots in the village of Waldrach (Trier, region of Rhineland-Palatinate). The results showed high infiltration rates (near 100 %) and subsurface flow which were detected by rainfall simulations performed at different times of the year (between September and December). The highest variations of the monitored rills (lateral and frontal movements) were noted before and during vintage, when footsteps occurred concentrated during a short period of time (between September and October). Finally, two maps of soil loss were generated, indicated by botanic marks on the graft union of the vines. 62.5 t ha−1 yr−1 soil loss was registered in the experimental plots of the new vineyards (2 years), while 3.4 t ha−1 yr−1 was recorded in the old one (35 years).

scholarly journals Studies on the Growth of Rice Plants Cultivated in Different Seasons. : I. Growing progress and changes of chemical composition in rice plant.

1959 ◽  
Vol 27 (3) ◽  
pp. 333-336 ◽  
Author(s):  
Keichi SAMOTO ◽  
Katsuo SUGIMOTO ◽  
Masayoshi UDA ◽  
Kaichiro SUZUKI
Keyword(s):  
Chemical Composition ◽  
Rice Plant ◽  
Rice Plants ◽  
Different Seasons

scholarly journals Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China

2011 ◽  
Vol 29 (8) ◽  
pp. 1401-1410 ◽  
Author(s):  
Q. Li ◽  
J. Xu ◽  
J. Yue ◽  
W. Yuan ◽  
X. Liu
Keyword(s):  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Northern China ◽  
Lower Atmosphere ◽  
Statistical Characteristics ◽  
Meridional Direction ◽  
Short Period ◽  
Different Seasons ◽  
One Year ◽  
Almost All

Abstract. An all-sky airglow imager (ASAI) was installed at Xinglong, in northern China (40.2° N, 117.4° E) in November 2009 to study the morphology of atmospheric gravity waves (AGWs) in the mesosphere and lower thermosphere (MLT) region. Using one year of OH airglow imager data from December 2009 to November 2010, the characteristics of short-period AGWs are investigated and a yearlong AGW climatology in northern China is first ever reported. AGW occurrence frequency in summer and winter is higher than that in equinoctial months. Observed bands mainly have horizontal wavelengths from 10 to 35 km, observed periods from 4 to 14 min and observed horizontal phase speeds in the range of 30 to 60 m s−1. Most of the bands propagate in the meridional direction. The propagation directions of the bands show a strong southwestward preference in winter, while almost all bands propagate northeastward in summer. Although the wind filtering in the middle atmosphere may control AGW propagations in the zonal direction, the non-uniform distribution of wave sources in the lower atmosphere may contribute to the anisotropy in the meridional direction in different seasons. Additionally, as an indication of local instability, the characteristics of ripples are also analyzed. It also shows seasonal variations, occurring more often in summer and winter and mainly moving westward in summer and eastward in winter.

scholarly journals New Device and Technology for Primary Processing of Silkworm Cocoons Obtained During Different Feeding Seasons

2020 ◽  
Vol 8 (5) ◽  
pp. 5118-5122
Keyword(s):  
Temperature Difference ◽  
Infrared Radiation ◽  
Technological Parameters ◽  
Temperature Changes ◽  
New Device ◽  
Short Period ◽  
Different Seasons ◽  
High Level ◽  
Short Time ◽  
Infrared Lamps

the article presents the developed device for mortification a silkworm pupa inside a cocoon by exposing it to infrared radiation and the technology for its use. The schemes of temperature changes in the structural bonds of a live cocoon pupa during its mortification under the influence of infrared radiation on cocoons obtained in different seasons of the year and the corresponding results of practical research are presented and analyzed. Studies have shown that the distance between the cocoon and the infrared lamp affects the temperature of the structural connections of the pupa and the cocoon. It was found that the treatment of cocoons with infrared radiation for a short period of time can cause an increase in the temperature of the pupa to an average of 79oC, and the temperature of the cocoon shell in comparison with the pupa decreases to 27oC. It was also found that when processing with distances between cocoons and infrared lamps equal to 10cm, 15cm and 20cm-the temperature of the pupa and the cocoon shell obtained in different seasons of the year may differ and the temperature difference of the pupa reaches 4oC, and the temperature difference of the cocoon shell is up to 9oC. In this regard, the process of mortification the pupa cocoons, obtained in spring, can be performed in a short time, resulting in saved technological parameters of the shell cocoons at a high level, which leads to improving the efficiency of unwinding cocoons enterprises, as well as to acquire high quality raw silk.

Sign in / Sign up

Export Citation Format

Share Document