Maxent
Maxent - Related Videos
02:48
Bond Polarity, Dipole Moment, and Percent Ionic Character
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2020
Bond Polarity The absolute value of the difference in electronegativity (ΔEN) of two bonded atoms provides a rough measure of the polarity to be expected in the bond and, thus, the bond type. When the difference is very small or zero, the bond is covalent and nonpolar. When it is large, the bond is polar covalent or ionic. The absolute values of the electronegativity differences between the atoms in the bonds H–H, H–Cl, and Na–Cl are 0 (nonpolar), 0.9 (polar covalent), and 2.1 (ionic),...
01:14
Moment of Inertia
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2023
The comparability between linear and angular velocities, linear and angular accelerations, and the kinematic equations of translational and rotational motion can be extended to the concept of inertia. If a rigid body is rotating about an axis but is not in translational motion, its translational kinetic energy is zero. However, since each particle undergoes rotational motion, it possesses non-zero velocity and kinetic energy. Thus, the kinetic energy of the rigid body, which is the sum of the...
01:17
Moment-Area Theorems
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2024
The Moment-Area Theorem is crucial in structural engineering for analyzing beam bending, particularly in applications like building floor supports. This theorem utilizes the geometric properties of the elastic curve, which depicts how a beam deforms under load, to simplify the calculations of deflections and slopes. The theorem is divided into two parts. The first part connects the angle between tangents at any two points on the beam's elastic curve to the area under a curve derived by plotting...
01:14
Principal Moments of Area
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2025
In mechanics, the product of inertia and moments of inertia of area help to calculate the stability and performance of various structures and components. The coordinate transformation relations are used to calculate the moments and products of inertia for an area about the inclined axes. Further, the moments and products of inertia with respect to the principal axes can be determined using the moments and products of inertia about the inclined axes. The principal moment of inertia axes are the...
01:12
Work of a Couple Moment
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2023
Mechanical engineering involves the study of motion, energy, and force, and is concerned with designing, manufacturing, and maintaining mechanical systems. One important concept in this field is the couple moment, produced by two equal and opposite forces acting at two points in a rigid body separated by a certain distance. When the rigid body undergoes a differential displacement due to a couple, its motion can be divided into two parts: equal translation of the two points to their final...
FAQs
Maxent evaluates the environmental characteristics associated with known occurrence locations and identifies a distribution across the landscape that satisfies those observed constraints. Among possible distributions, it selects the least-biased one consistent with the available information. This principle allows the model to estimate geographic suitability without requiring confirmed absence records.
The comparison provides context for determining whether environmental conditions at observed locations are distinctive or broadly available. Presence records alone show where a species has been detected, while landscape-wide conditions indicate where similar environments may occur. This contrast helps produce a spatial estimate of suitability rather than simply plotting known locations.
Sampling design can influence which environmental conditions appear associated with the species because occurrence records may not represent the full landscape evenly. If the records are biased, the resulting suitability pattern may also be biased. Careful sampling design, followed by model evaluation and cautious interpretation, is therefore important when using outputs for environmental decisions.
A typical workflow begins with known species occurrence locations and environmental-condition data covering the study landscape. Maxent compares the conditions at observed sites with those available elsewhere, produces a geographic suitability estimate, and then evaluates the result. Researchers can interpret the mapped pattern and influential predictors in relation to the study objective.
Influential predictors indicate which environmental conditions contribute most strongly to the model's estimated suitability pattern. Examining them can help researchers interpret why certain areas are identified as more or less suitable and can provide ecological context for mapped results. These predictors should still be considered alongside sampling design, evaluation, and the limits of interpretation.
Maxent outputs can support habitat suitability mapping and conservation planning by identifying areas with environmental conditions associated with a species. The same approach can help assess where an invasive species may find suitable conditions and examine potential range shifts under climate-related changes. In each application, model evaluation and careful interpretation are essential before guiding decisions.