Science topic

Sciuridae - Science topic

Sciuridae is a family of the order Rodentia which contains 49 genera. Some of the more common genera are MARMOTA, which includes the marmot and woodchuck; Sciurus, the gray squirrel, S. carolinensis, and the fox squirrel, S. niger; Tamias, the eastern and western chipmunk; and Tamiasciurus, the red squirrel. The flying squirrels, except the scaly-tailed Anomaluridae, also belong to this family.
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We are designing 3 phase squirrel cage induction motor for EV,
Our main aim is to get high efficiency, power factor,and breakdown torque...
How can I design by satisfying these three parameters...
What should I change /focus mainly in designing. ..?
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Ok sir thank you,,,,
My main aim is to get 90% efficiency and ,high torque and high power factor..... for squirrel cage induction motor....
I am using Ansys maxwell Rmxprt software is it sufficient to design?
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I have multiple datasets with different classification labels for the example dataset 1 contains two classes cat and dog, dataset 2 contain another two classes raccoons and squirrels and I want to train a model that can classify between cat, dog, raccoons, squirrels, and other animals how to proceed?
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Okay , you can proceeded via depended on description various parameters such as morphological features of animales. Thanks
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Our group (we are zoologists focusing on animal orientation) is considering buying a georadar to map the tunnels of subterranean mammals. We would like to study the position and direction of the tunnel networks of animals of various sizes (from voles to bigger animals such as ground squirrels, i.e., tunnels with various diameter in various depths) living in various types of soils and environments. When we received the visualization of our trial measurement of voles tunnels on the field, we were, however, a bit sceptical whether this is a suitable method (difficult to discern what is a tunnel and what some other anomaly such as rocks etc.).
  1. Any tips, tricks or experience with using georadar in animal ecology?
  2. How to get the most precise visualization of the networks?
  3. Would you recommend to use the 750 or 450 mHz antenna?
Thanks!
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Thanks, Niklas! That is indeed really nice and thoroughly conducted study! :) I am already in contact with Adam Booth.
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Hi all
I am currently trying to complete my dissertation - a meta analysis focusing on how indirect and direct predation risk has an effect on the foraging efficiency in squirrel species - and I have reached a point where I am stuck...
I have used cohens d to calculate the effect size and recorded this, the 95% upper and lower CI and also the v value - and I now need to work out how to calculate a grand total effect size and all the other information (possibly using R) to produce a forest and funnel plot?
Any help would be great please and thanks - I have attached my excel data collection also :)
Ruby
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This R code gives you a basic random effects analysis, reading in data from you excel sheet:
library(readxl)
sq.dat <- read_xlsx('~/Desktop/squirrel data/datafordissertation.xlsx')
summary(sq.dat)
library(metafor)
sq.io1 <- rma(yi=d, vi=v, measure='SMD', knha=T, data=sq.dat)
funnel(sq.io1)
Note: you have a typo in one of your v values - with two "0.." instead of "o." that needs correcting. (it also better to calculate these within the metafor package using escape to avoid errors). At least one d estimate looks wrong ) The -17 and probably the +8 value too and maybe reporting errors in the original papers or calculation errors by you.
Also I'd always include the raw data for the d calculation in the spreadsheet to be able to locate errors. I'm not sure what the odds bit is? You aren't converting from odds ratios? If so it would be better to meta-analyze the odds ratio in metafor.
Finally if all the measures are on the same scale you don't need to use Cohen's d - just meta-anlyze the raw measurements on their original scale.
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While working on squirrel calls, I found that the frequency of the sound produced by individuals from mean sea level is quite more than the same from an elevation of about 2000 metres. Does the frequency depends upon the elevation of habitat and changes with change in the height or their is something else behind the aforesaid phenomenon.
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Hi Anish,
It is interesting that vocalization frequency tends to get lower as one proceeds up an altitudinal gradient. Moreover, dominant frequency also decreases with increasing body size. For many animals, body size also increases as one proceeds up an altitudinal gradient, due to harsher conditions at higher altitudes. Harsher conditions favor larger animals with smaller surface area-to-volume ratios.
In a study (refernce below) we did on hearing in tropical treefrogs found along an altitudinal gradient in Puerto Rico, we concluded:
"We suggest that the animal’s body size determines the frequency particulars of the call apparatus and the inner ear."
Meenderink SWF, Kits M and Narins PM (2010) Frequency matching of vocalizations to inner-ear sensitivity along an altitudinal gradient in the coqui frog. Biol Letters 6: 278-281. doi:101098/rsbl20090763.
I hope this helps,
Peter
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I am working to develop a set of baits for Gunnison's prairie dogs and am unsure whether to set the bait length to 80 base pairs, 120 base pairs (BaitsTools default), or something else. These baits will be used for future population genetics studies between the two subspecies of Gunnison's prairie dogs. Any insight on this topic would be greatly appreciated.
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Optimal foraging theory predicts (generally) that greater resources might be prioritized by the species, while smaller baits should be ignored in the presence of the bigger ones, but then this is a rough generalization. There may be many factors interacting... If you could, performing a pilot study would greatly benefit your study... Find out how they will react in contact with the bigger and smaller bait and how their preference would vary on different experimental designs. That's what I would do.
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Why inertia of Squirrel cage induction generators (SCIG) and Double fed DFIGS is less than conventional synchronous generators?
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due to the rotor of synchronous generator has a magnetic poles (laminations) while the squirrel cage induction generator has a cylinderical shape without poles
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Why is the transient angle stability of doubly fed induction generator (DFIG) better than squirrel cage induction generator (SCIG)?
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Thanks, yeah I found it from some papers also.
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There are tow types of induction generators used in renewable energy generation
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Hello there,
Wound rotor type of induction generators are the most popular choice in the present time to convert wind energy to electrical energy due to its ability to control active and reactive power with the help of power converters.
However, the cheaper squirrel cage type might be suitable for rural autonomous grids.
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I am investigating learning and problem solving patterns/behaviours of Grey Squirrels (and would like to know everything possible on the subject.
Any research links or citing would be much appreciated.
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following
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How can I model the rotor of a three phase squirrel cage induction motor in FEMM?
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We survey Bengal Slow Loris in several fixed transects in a forest of Northeastern Bangladesh, while we regularly encounter Particloloured Flying Squirrel (Hylopetes alboniger) and noted down with GPS co-ordinate. Surveys in the transect are not equal. Hence, a one year (at least 4 nights in a month) effort to the opportunistic encounters can reveal the accurate population size of the squirrel in the area?
If possible let me know data analysis patterns in estimating total population from the direct observations. 
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Tanvir -
I am glad you found our paper interesting, but I have to add that these are relative densities, which is not the same as absolute densities let alone population size. Relative densities and absence-presence data are important, but in order to get the absolute population size you have to use other methods as indicated in the previous discussion.
Cheers, Andreas