density-dependent

Examples of density-dependent in the following topics:

• Density-Dependent and Density-Independent Population Regulation

  • Population regulation is a density-dependent process, meaning that population growth rates are regulated by the density of a population.
  • In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population.
  • An example of density-dependent regulation is shown with results from a study focusing on the giant intestinal roundworm (Ascaris lumbricoides), a parasite of humans and other mammals.
  • The actual cause of the density-dependence of fecundity in this organism is still unclear and awaiting further investigation.
  • In real-life situations, population regulation is very complicated and density-dependent and independent factors can interact.

• Overcoming Density-Dependent Regulation

  • Humans have exceeded density-dependent limits on population by enacting various environmental changes to accommodate our needs for hygiene, shelter, and food.
  • This capability is an underlying reason for human population growth as humans are able to overcome density-dependent limits on population growth, in contrast with all other organisms.
  • Describe ways in which humans overcome density-dependent regulation of population size

• Multiple Regression Models

  • One of the measurement variables is the dependent ($Y$) variable.
  • You've gone to a number of beaches that already have the beetles and measured the density of tiger beetles (the dependent variable) and several biotic and abiotic factors, such as wave exposure, sand particle size, beach steepness, density of amphipods and other prey organisms, etc.
  • Multiple regression would give you an equation that would relate the tiger beetle density to a function of all the other variables.
  • A second use of multiple regression is to try to understand the functional relationships between the dependent and independent variables, to try to see what might be causing the variation in the dependent variable.
  • If you did a regression of tiger beetle density on wave exposure by itself, you would probably see a significant relationship.

• Flotation

  • Density plays a crucial role in Archimedes' principle.
  • The extent to which a floating object is submerged depends on how the object's density is related to that of the fluid.
  • where $\bar{\rho}_\mathrm{obj}$ is the average density of the object and $\rho_\mathrm{fl}$is the density of the fluid.
  • Note that it mentions the average density of the object.
  • This formula makes sense only if the density of the object is smaller than the density of the fluid.

• X-Ray Imaging and CT Scans

  • Radiography uses x-rays to view material that cannot be seen by the human eye by identifying areas of different density and composition.
  • X-ray imaging, or radiography, used x-rays to view material within the body that cannot be seen by the human eye by identifying areas of different density and composition.
  • Depending on the physical properties of the object (density and composition), some of the X-rays can be partially absorbed.

• Density

  • The density of a binary network is simply the proportion of all possible ties that are actually present.
  • Network>Cohesion>Density is a quite powerful tool for calculating densities.
  • The Network>Cohesion>Density algorithm also can be used to calculate the densities within partitions or blocks by specifying the file name of an attribute data set that contains the node name and partition number.
  • That is, the density tool can be used to calculate within and between block densities for data that are grouped.
  • Point connectivity can be a useful measure to get at notions of dependency and vulnerability.

• Basic Map Types

  • Depending on what trends in your data you want to showcase, you can choose one of a variety of thematic maps.
  • Thematic maps depict particular economic, social, demographic, political, or environmental themes like population density, age distribution, political party preference, income, or malaria incidence.
  • Dot maps use dots to show comparative densities of features over a base map.
  • For instance, if you wanted to display the relative densities of cattle across the continental US, if one city had 2,223 cattle and you decided to represent 500 cattle with one dot, that city would have a cluster of four dots.
  • Density maps depict the concentration of points across a continuous surface by joining adjacent points together and shading more concentrated clusters more darkly.

• Energy in a Magnetic Field

  • The energy density is given as $u = \frac{\mathbf{B}\cdot\mathbf{B}}{2\mu}$.
  • Energy density is the amount of energy stored in a given system or region of space per unit volume.
  • For hysteretic materials such as ferromagnets and superconductors, the work needed also depends on how the magnetic field is created.
  • For linear non-dispersive materials, though, the general equation leads directly to the simpler energy density equation given above.
  • Express the energy density of a magnetic field in a form of equation

• The Density Scale

  • Density estimation is the construction of an estimate based on observed data of an unobservable, underlying probability density function.
  • Histograms are used to plot the density of data, and are often a useful tool for density estimation.
  • Density estimation is the construction of an estimate based on observed data of an unobservable, underlying probability density function.
  • The unobservable density function is thought of as the density according to which a large population is distributed.
  • A probability density function, or density of a continuous random variable, is a function that describes the relative likelihood for this random variable to take on a given value.

• Recycling and Disposal

  • This, however, depends on using appropriate materials.
  • When placed in a medium of intermediate density, particles of different densities separate-lower density particles float while those of higher density sink.
  • Various separation media have been used, including water or water solutions of known density (alcohol, NaCl, CaCl2 or ZnCl2).
  • As shown in the following table, the densities of common plastics differ sufficiently to permit them to be discriminated in this fashion.
  • Some polymers, such as polystyrene and polyurethane, are commonly formed into foamed solids that have a much lower density than the solid material.