The Relationship Between Predators and Scavengers Essay

The Relationship Between Predators and Scavengers - Essay Example The issue raised in the story has raised the emotions of the readers. Luna the most loved whale dies in British Columbia waters. The orphaned whale had won the heart of many whale lovers around the world the globe. The appearance of the young killer whale at Nootka had attracted much attention from the media around the world. The whale enjoyed developing relationship with people and played with anything around it including the boats. The close relationship between the whale and the humans was, unfortunately, the cause of its death. The young Luna was killed had been killed by a boats propeller in 2006. Even though the occurrence saddened many people, a few individuals were relieved since the animal’s curious behavior had resulted in number problems that had not yet been resolved. Luna’s playfulness had destroyed many boats creating conflicts with the boat owners. The challenges were difficult to determine by fisheries officers (Henderson, 160-162). Groc was not successf ul in avoiding emotional response. The writer tried to explain the issues that may have led to the whale being lonely. The writer continued to explain how the whale had struggled to develop a relationship with the human beings. It was desirable for the writer to produce an emotional response with an intention of keeping the reader on the track. The authors desire to look at the issues objectively and equitably were effectively achieved. She explains how the orphaned whale had developed friends and enemies in different measures. Despite the whale struggling to build a relationship with humans, she was killed by the same people that she used to play with. I totally agree that humans were responsible for the demise of the orphaned Luna, since the whale was discovered.

Scanning Electron Microscope Essay Example | Topics and Well Written Essays - 1500 words

Scanning Electron Microscope - Essay Example Areas that range from a width of one centimetre to as minute as five microns can be seen in scanning mode using techniques in scanning electron microscopy. The magnification ranges from 20X to 30,000X with spatial resolution of fifty to one hundred nanometres. The SEM also has the capability of analysing specific locations found on the sample, with this approach being particularly useful in semi-quantitative and qualitative determination of crystal orientations, crystalline structure, and chemical compositions. A scanning electron microscope images samples via scanning them with electron beams with the sample in a raster scan pattern (Reimer, 2008 p 97). The electrons released by the SEM interact with sample atoms and produce signals that consist of information revealing the composition and topography, as well as electrical conductivity. In its functioning, accelerated electrons carry specific amounts of kinetic energy which is dissipated in form of various signals derived from inter actions between the sample and the electrons (Reimer, 2008 p97). This occurs when the electrons incident on the sample are decelerated on contact with the sample. The received signals could be in form of secondary electrons, heat, visible light, photons, and diffracted backscattered electrons. Backscattered electrons and secondary electrons are usually utilized for sample imaging, with secondary electrons also used for showing the topography and morphology of the sample with backscattered electrons are used for contrast illustration of multiphase sample composition. X-rays are produced by through inelastic collisions of electrons incident on the sample and the electrons present in the sample atom’s discrete shells. During these electrons return to their lower energies, they give out fixed wavelength X-rays. Each element in the mineral being investigated produces X-rays which are characteristic to it when excited by the beam of electrons. This process is non-destructive as the se X-rays do not cause any change in volume of the sample when they are lost. Thus, the same material can be investigated continuously. A scanning electron microscope has the following essential components (Reimer, 2008 p90): Source of electrons Electron lenses Stage for the sample Sensors for detecting all signals required Devices for data output and display Power supply, cooling system, vacuum system, electric and magnetic field free room, and a vibration free floor SEMs will always possess one detector usually for detection of secondary electrons, with most having more detectors. The accommodated detectors critically determine the instrument’s specific capabilities. Scanning electron microscopes are normally used for the generation of high-resolution images of various samples and their chemical spatial variations (Goldstein, 2009 p63). They aid in the acquisition of elemental maps or EDS assisted spot chemical analysis and phase discrimination using the sample atomsâ€℠¢ mean atomic number. They also give the compositional maps which they base on trace element differences. The scanning electron microscope is also used for the identification of phases with basis on crystalline structure and/or qualitative chemical analysis (Goldstein, 2009 p63). Specific measurement of extra small features which could be to fifty nanometres in size can also be done using scanning electron