Point médian, point de friction

La Pensée ◽  
2020 ◽  
Vol N° 403 (3) ◽  
pp. 68-79
Author(s):  
Claude Simon
Keyword(s):  
Median Point

Computing a median point of a simple rectilinear polygon

1994 ◽  
Vol 49 (6) ◽  
pp. 281-285 ◽  
Author(s):  
Victor Chepoi ◽  
Feodor Dragan
Keyword(s):  
Median Point ◽  
Rectilinear Polygon

Significant Factors in the Plerocercoid Environment of Diphyllobothrium latum (Linn.)

1933 ◽  
Vol 11 (1) ◽  
pp. 25-44 ◽  
Author(s):  
Robert Arnold Wardle
Keyword(s):  
Survival Time ◽  
Initial Period ◽  
Electrolyte Solutions ◽  
Time Varying ◽  
Optimum Range ◽  
Larval Stages ◽  
Time Value ◽  
Locke Solution ◽  
Diphyllobothrium Latum ◽  
Median Point

1. Plerocercoid larval stages of Diphyllobothrium latum (Linn.), in 0·2 molar sodium chloride can tolerate temperature values between −8° and 55°C., the survival time varying from 15 minutes at 54° C. to 60 hours at 20° C., and diminishing gradually from 24+ hours at zero to non-survival at −8°C. The optimum range of values lies between 38° and −2·8° C. It is suggested that the median point of the optimum range approximates to the mean summer temperature of the host fish and that variations in temperature from this mean point restrict the survival time value of the intramuscular plerocercoid phase.2. They can tolerate concentrations of HCl between 0·3 and 0·001 molar if 0·5 per cent. of pepsin be present, and concentrations of Na2CO2 between 0·2 and 0·001 molar, when 3 per cent. of pancreatin is present, for the length of time they would normally be subject to canine or human gastric and duodenal digestion.3. They can tolerate the component salts of Ringer-Locke solution when in concentrations between 0·2 and 0·001 molar for periods of time varying with the concentration and with the chemical structure of the salt. The addition of other electrolytes to decimolar NaCl does not increase its value as a medium for the larvae.4. The behaviour of plerocercoids in electrolyte solutions of 0·2–0·001 molar concentration is essentially similar, and initial period of activity being followed by a period of contraction and latent mobility—which, however, may be omitted—passing into a period of endosmotic immobility and disintegration. It is suggested that activity is stimulated by the influence of absorbed CI' upon muscular irritability and that depression of activity is induced by absorption of the kation of neutral salts or of the whole molecule of acids or alkalies.

scholarly journals Examining the Determinants of Privatization: The ASEAN Context

2020 ◽  
Vol 10 (2) ◽  
pp. 370
Author(s):  
Chotiphun Tiaviwat
Keyword(s):  
National Development ◽  
Policy Implications ◽  
Current Account Balance ◽  
The Novel ◽  
Institutional Conditions ◽  
Institutional Determinants ◽  
Development Policies ◽  
Per Capita ◽  
Median Point ◽  
Observation Period

This paper examines the economic, political, and institutional determinants of the propensity of privatization, as well as the sensitivity of privatization, in the Association of Southeast Asian Nations (ASEAN) context over the observation period from 1988 to 2008, with the Asian Financial Crisis being the median point of the observation period. This is particularly to investigate the organic progression of the privatization of ASEAN nations as an isolated endogenous phenomenon. This paper, using a two-stage quantitative technique, aims to exhibit the novel, and to a degree inventive, insights that are unique to the context of ASEAN, as well as to identify the potential policy implications directed towards how ASEAN policymakers may steer their national development policies to manufacture the constructive economic, political, and institutional conditions needed to foster privatization processes. The findings indicate that GDP per capita, current account balance, and stock market capitalization are statistically the key moving parts that contribute to the propensity of privatization, as well as the sensitivity of privatization, in the ASEAN context.

scholarly journals Cytological Studies on Two Species, Xanthium strumarium Linn. and Bidens pilosa Linn. Var. minor (Blume) Sherff (Asteraceae-Heliantheae) from Nepal

2017 ◽  
Vol 5 (1) ◽  
pp. 66-71
Author(s):  
Pushpa Karna
Keyword(s):  
Chromosome Number ◽  
Chromosome Length ◽  
Terminal Region ◽  
Xanthium Strumarium ◽  
Pollen Stainability ◽  
Bidens Pilosa ◽  
Median Region ◽  
Absolute Length ◽  
Karyotype Formula ◽  
Median Point

Karyotype, meiosis and pollen stainability of the taxa Bidens pilosa L. var. minor (Blume) Sherff and Xanthium strumarium L. collected from central part of Nepal was cytologically carried out. Results obtained from this investigation showed that chromosome number in somatic cells were recorded to be 2n=36 in Bidens pilosa and 2n=32 in Xanthium strumarium using aceto-orceine squash technique. Likewise haploid chromosome number in reproductive cells were recorded to be n=18 in Bidens pilosa and n=16 in Xanthium strumarium using aceto-carmine squash technique. The range of chromosome length found to be 0.4 to 2.1 µm in Bidens pilosa and 0.4 to 1.6 µm in Xanthium strumarium. Karyotype formula was M16+m2+sm14+st4 for Bidens pilosa and M18+ sm12+st2 for Xanthium strumarium. Based on the position of the centromeres, the chromosomes were categorized into four types with centromere at median point, median region, sub median region and terminal region in Bidens pilosa whereas three types, namely chromosomes with centromere at median point, sub median region and sub terminal region in Xanthium strumarium . In Bidens pilosa karyotype is asymmetrical and slightly asymmetrical karyotype is found in Xanthium strumarium. Absolute length recorded in Bidens pilosa were 19.2µm and 15.8. µm in Xanthium strumarium . Pollen stainability is found to be 94.0 percent in Bidens pilosa and 92.7 percent in Xanthium strumarium.Int. J. Appl. Sci. Biotechnol. Vol 5(1): 66-71

scholarly journals Study on optimal start-up time and water usage volume of blowdown residue discharge of mesh filter

2020 ◽  
Author(s):  
Kai Shi ◽  
Zhenji Liu ◽  
Yan Xie ◽  
Man Li
Keyword(s):  
Water Resources ◽  
Working Conditions ◽  
Pressure Difference ◽  
Inflection Point ◽  
Abrupt Change ◽  
Water Usage ◽  
Filtration Time ◽  
Filtration Cycle ◽  
Start Up ◽  
Median Point

Abstract The water volume used for blowdown of a mesh filter is one of the important indicators to evaluate the economic benefit of a mesh filter. The amount of water used for drainage of the mesh filter can be controlled by setting the start-up time of the blowdown residue discharge of the mesh filter. Through the indoor prototype test, the sediment of the Manas riverbed in Xinjiang, China, was used as the filter medium to test the mesh filter and analyze the water usage volume at each stage. The test focused on the analysis of the trend of the pressure difference between the inlet and outlet of the mesh filter over the filtration time. The results showed that as the filtration time was prolonged, the inlet and outlet pressure difference of the mesh filter showed an S-shaped curve with time. The pressure difference between the inlet and outlet can be divided into four stages, i.e., the start of filtering to the first inflection point of the abrupt change in the pressure difference, the first inflection point of the abrupt pressure difference change to the median point of filtering, the median point of filtering to the second inflection point of the abrupt change in the pressure difference, and the second inflection point of the abrupt pressure difference change to the end of filtering. At the same time, the water usage volume for blowdown was calculated under various working conditions. This paper analyzed the start-up time of blowdown at three different time points, i.e., after the completion of the entire filtration cycle of the traditional mesh filter, at the first inflection point of pressure difference, and at the second inflection point of pressure difference. The tests were performed under the condition that the filtration cycle of the mesh filter was ten days. The results have shown that compared with the traditional screen filter that starts the blowdown at the end of the entire filtration cycle, starting the blowdown at the first inflection point of pressure difference can save 200–300 m3 of water resources for a single mesh filter, and starting the blowdown at the second inflection point of pressure difference can save 30–90 m3 of water resources for a single mesh filter. Meanwhile, the working conditions in the analyses in this paper were consistent with the actual engineering operating conditions. It is recommended that the mesh filter in the micro-irrigation system use the first inflection point of pressure difference to control the start-up time of the blowdown residue discharge, which can not only save water resources, but also ensure that the mesh filter runs at the optimal filtering conditions.

A new species of Corallana Dana, 1852 (Crustacea: Isopoda: Corallanidae) from the Andaman Islands, northern Indian Ocean

Zootaxa ◽  
2022 ◽  
Vol 5087 (2) ◽  
pp. 357-371
Author(s):  
PATHAN ANIL ◽  
NIEL L. BRUCE ◽  
K.A. JAYARAJ
Keyword(s):  
Obtuse Angle ◽  
Andaman Islands ◽  
Northern Indian Ocean ◽  
Weakly Convex ◽  
The Status ◽  
South Andaman ◽  
Lateral Margins ◽  
Mangrove Roots ◽  
Median Point ◽  
A New Species

Corallana mishrai sp. nov. collected from dead mangrove roots at Kodiyaghat, South Andaman, Andaman Islands, India is described and illustrated in detail. Corallana mishrai sp. nov. the first definitive record of the genus from India, is characterized by: frontal lamina with short straight (or very weakly convex) lateral margins and the anterior margin forming a strong acute median point; pleotelson length 0.76 greatest width, posterior margin with 5 robust setae; uropodal exopod 7 times longer than greatest width, extending beyond endopod by one fourth of its length; endopod lateral margin slightly convex with 4 RS and PMS, apex forms a slightly obtuse angle with long simple setae, mesial margin weakly convex with 2 RS and PMS; mandible bidentate; transverse row of 6 tubercles present on pereonite 1 and pleonites 2, 3 and 4 lacking lateral tubercles. The status of the genus and its species are reviewed, and two species are transferred to new combinations: Argathona kulai (Bruce, 1982) comb. nov. and Tachaea bidentata (Jones et al. 1983) comb. nov.  

Redescription of Ryukyua circularis (Pillai, 1954) (Isopoda, Cymothoidae), parasite of the Bleeker smoothbelly sardinella Amblygaster clupeoides Bleeker, 1849 from India

Zootaxa ◽  
2018 ◽  
Vol 4526 (2) ◽  
pp. 195
Author(s):  
P. VIGNESHWARAN ◽  
S. RAVICHANDRAN ◽  
MELISSA B. MARTIN
Keyword(s):  
Posterior Margin ◽  
Body Shape ◽  
Gravid Female ◽  
Weakly Convex ◽  
Female Adult ◽  
Indian Waters ◽  
Lateral Margins ◽  
Median Point ◽  
First Time ◽  
Posterolateral Margin

Ryukyua circularis (Pillai, 1954) is recorded here for the first time on the host Amblygaster clupeoides Bleeker, 1849 from Indian waters. The species is redescribed with illustrations of the gravid female, adult male and manca from its type locality, and the known hosts and geographical records of the species are reviewed. Ryukyua circularis is readily identified from the oval to rounded body shape, widest at pereonite 3–5; cephalon deeply immersed in pereonite 1; mandible palp with the spiny surface, article 3 with a long terminal setae; pleonite 1–3 partially overlapped by a posterolateral margin of pereonite 7; pleotelson anterior lateral margins weakly convex, posterior margin evenly rounded, without median point. 

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