scholarly journals Abiotic Factors Effect on the Distribution and Density of Species of the Families Unionidae, Pisididae, Euglesidae and Corbiculidae in High Mountains of the Kashkadarya Riverside Zone

2021 ◽  
Vol 7 (11) ◽  
pp. 28-33
Keyword(s):  
Abiotic Factors ◽  
Water Flow Rate ◽  
Water Clarity ◽  
Middle Part ◽  
Head Part ◽  
Bivalve Mollusks ◽  
High Mountains ◽  
Desert Region ◽  
Hill Region ◽  
The Hill

As a result of the study, it has been identified that the water temperature in the Kashkadarya River is 18–24 °C, the water clarity is 0.51–0.62 m and the water flow rate is 0.72–0.84 m/sec. The species of bivalve mollusks Sinanodonta gibba, S. orbicularis, S. puerorum, Colletopterum cyreum sogdianum, Corbicula cor, C. fluminalis, C. purpurea, Corbiculina tibetensis, C. ferghanensis are widespread in the region. The abiotic factors discussed in the paper play an important role in the distribution of mollusks. There are 13 species of bivalve mollusks in the mountainous region, which is the head part of the river, 9 species in the middle part of the hill region of the river and 6 species in the lower desert region.

Bioeconomic optimization of conservation agriculture production systems (CAPS) for smallholder tribal farmers in the hill region of Nepal

2016 ◽  
Vol 71 (2) ◽  
pp. 103-117 ◽  
Author(s):  
B. Paudel ◽  
C. Chan ◽  
J. Halbrendt ◽  
S. E. Crow ◽  
T. J. K. Radovich ◽  
...  
Keyword(s):  
Production Systems ◽  
Conservation Agriculture ◽  
Hill Region ◽  
Tribal Farmers ◽  
The Hill

scholarly journals Activity strategy and pattern of the Siberian jerboa (Orientallactaga sibirica) in the Alxa desert region, China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10996
Author(s):  
Yu Ji ◽  
Shuai Yuan ◽  
Heping Fu ◽  
Suwen Yang ◽  
Fan Bu ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Predation Risk ◽  
Abiotic Factors ◽  
Activity Patterns ◽  
Food Resources ◽  
Sources Of Information ◽  
Activity Time ◽  
Desert Region ◽  
Infrared Cameras ◽  
Perceived Predation Risk

Rodents exhibit seasonal changes in their activity patterns as an essential survival strategy. We studied the activity patterns and strategies of the Siberian jerboa (Orientallactaga sibirica) in the Alxa desert region to better understand the habitats and behavioural ecology of xeric rodents. We conducted an experiment using three plots to monitor the duration, time, and frequency of the active period of the Siberian jerboa using infrared cameras in the Alxa field workstation, Inner Mongolia, China in 2017. The relationships between the activity time and frequency, biological factors (perceived predation risk, food resources, and species composition), and abiotic factors (temperature, air moisture, wind speed) were analysed using Redundancy Analysis (RDA). Our results showed that: (1) relative humidity mainly affected activities in the springtime; temperature, relative humidity and interspecific competition mainly affected activities in the summertime; relative humidity and perceived predation risk mainly influenced activities in the autumn. (2) The activity pattern of the Siberian jerboa altered depending on the season. The activity of the Siberian jerboa was found to be bimodal in spring and summer, and was trimodal in autumn. The activity time and frequency in autumn were significantly lower than the spring. (3) Animals possess the ability to integrate disparate sources of information about danger to optimize energy gain. The jerboa adapted different responses to predation risks and competition in different seasons according to the demand for food resources.

scholarly journals Development of production technology of rolling stock cast parts

2021 ◽  
Vol 264 ◽  
pp. 05013
Author(s):  
Otabek Toirov ◽  
Nodirjon Tursunov
Keyword(s):  
Middle Part ◽  
Mold Cavity ◽  
Rolling Stock ◽  
Head Part ◽  
Gating System ◽  
Filling Process ◽  
Current Production ◽  
Computer Simulation Program ◽  
Cast Parts ◽  
Railway Rolling Stock

Using the computer simulation program ProCAST, the analysis of the processability of the gating system used in the current production of the SK “Foundry-Mechanical Factory” in the manufacture of large cast parts of railway rolling stock was performed. Based on computer modeling, a new design of a gating system with a dispersed metal motive with different sizes of feeder sections was developed, providing simultaneous parallel filling of all parts of the mold cavity. The feature of the proposed design of the gating system is the presence of an extended horizontal collector and the supply of metal to the end parts of the casting. With this design, two counter-flows are formed in the mold cavity, their fusion occurs in the middle part of the casting in a cooled and highly polluted state, since during the filling process, the head part of the flow collects sand inclusions along the way, is oxidized and saturated with hydrogen. These factors are a prerequisite for the formation of various defects in castings.

Impact of a pilot acute respiratory infection (ARI) control programme in a rural community of the hill region of Nepal

1989 ◽  
Vol 9 (4) ◽  
pp. 212-220 ◽  
Author(s):  
Mrigendra Raj Pandey ◽  
Pushpa Raj Sharma ◽  
Bhakta Bahadur Gubhaju ◽  
Gautam Man Shakya ◽  
Ram Prasad Neupane ◽  
...  
Keyword(s):  
Respiratory Infection ◽  
Rural Community ◽  
Acute Respiratory Infection ◽  
Control Programme ◽  
Hill Region ◽  
The Hill

On the Dynamical Properties of the Sun-Earth-Moon Restricted Four Body Problem

2013 ◽  
Vol 834-836 ◽  
pp. 1869-1872
Author(s):  
Yun Yan Zhang ◽  
Nan Li ◽  
Yan Jun Li
Keyword(s):  
Body Problem ◽  
Equilibrium Points ◽  
Integral Relation ◽  
The Sun ◽  
Hill Region ◽  
Calculation Results ◽  
Four Body Problem ◽  
The Stability ◽  
Three Body ◽  
The Hill

The properties of the sun-earth-moon restricted four body problem were investigated. On the base of the earth-moon circular restricted three body problem, taking gravitation effect of the sun into account, a dynamic model of restricted four body problem was established. Equilibrium points were calculated by proper numerical method and linearization procedure was introduced to obtain the stability of these points. An invariant integral relation of this four body problem similar with Jacobi integral was derived, then the Hill region was investigated. Calculation results show that the equilibrium points will keep moving near libration points, also has their stability unchanged, and the Hill region will be non-periodically time varying.

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