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单词 focusing
释义

focusing


fo·cus

F0220200 (fō′kəs)n. pl. fo·cus·es or fo·ci (-sī′, -kī′) 1. a. The distinctness or clarity of an image rendered by an optical system.b. The state of maximum distinctness or clarity of such an image: in focus; out of focus.c. An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus.2. a. A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system: the focus of a lens. Also called focal point.b. See focal length.3. a. A center of interest or activity: "Precisely how diet affects E. coli in livestock is the focus of current research" (Cindy Engel).b. Close or narrow attention; concentration: "He was forever taken aback by [New York's] pervasive atmosphere of purposefulness—the tight focus of its drivers, the brisk intensity of its pedestrians" (Anne Tyler).c. A condition in which something can be clearly apprehended or perceived: couldn't get the problem into focus.4. Medicine The region of a localized bodily infection or disease.5. Geology The point of origin of an earthquake.6. Mathematics A fixed point whose relationship with a directrix determines a conic section.v. fo·cused, fo·cus·ing, fo·cus·es or fo·cussed or fo·cus·sing or fo·cus·ses v.tr.1. To cause (light rays, for example) to converge on or toward a central point; concentrate.2. a. To render (an object or image) in clear outline or sharp detail by adjustment of one's vision or an optical device; bring into focus.b. To adjust (a lens, for example) to produce a clear image.3. To direct toward a particular point or purpose: focused all their attention on finding a solution to the problem.v.intr.1. To converge on or toward a central point of focus; be focused.2. To adjust one's vision or an optical device so as to render a clear, distinct image.3. To concentrate attention or energy: a campaign that focused on economic issues.
[New Latin, from Latin, hearth (probably in reference to the fact that a lens or parabolic mirror can concentrate sunlight on a single point to start a fire).]
fo′cus·er n.
Thesaurus
Noun1.focusing - the concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life"centering, focus, focussing, focal point, directionengrossment, immersion, absorption, concentration - complete attention; intense mental effortparticularism - a focus on something particular
2.focusing - the act of bringing into focusfocalisation, focalizationintensification - action that makes something stronger or more extremerefocusing - focusing again
Translations
messa a fuoco

Focusing


Focusing

 

in particle accelerators, the process of controlling the transverse motion—that is, motion perpendicular to the orbit—of charged particles. In most cases this process can be studied independently of phase stability, which provides stability of particle motion in the longitudinal direction—that is, along the orbit.

Depending on the type of accelerator being considered, the distance the particles travel ranges from a few meters to hundreds of thousands of kilometers. Because particles are not injected into an accelerator at exactly the same position, angle, and energy, they deviate from the equilibrium orbit. In the course of acceleration the deviations may increase owing to collisions with the molecules of the residual gas in the accelerator chamber and to imperfections in the magnet and accelerating systems. The Coulomb repulsion between particles may also lead to deflection from the equilibrium orbit. Sufficiently strong focusing must be provided so that the aggregate effect of the factors mentioned above does not result in the particles’ colliding with the walls of the accelerator chamber. Other conditions being equal, the focusing force determines the maximum number of particles accelerated.

Magnetic focusing is most common. It is provided by a certain configuration of the magnetic field and depends primarily on the field index n (B ~ r–n, where B is the magnetic induction and r is the radius as measured from the orbit’s center of curvature). In an axisymmetric magnetic field (as in a cyclotron, betatron, or the early electron and proton synchrotrons) what is called weak, or constant-gradient, focusing is achieved when 0 < n < 1. Strong, or alternating-gradient, focusing is accomplished in an azimuthally periodic magnetic field—for example, when n = n0 sin (Nφ), where φ is the azimuth and N is the number of periods per orbit. The permissible values of n0 ≫ 1 depend on N. In practice sector-type focusing (n > 0) and defocusing (n < 0) magnets are used together with straight sections without a magnetic field. Typical arrangements are FODO and FDODFO, where F represents a focusing magnet, D a defocusing magnet, and O a straight section. In linear accelerators alternating-gradient focusing is carried out by means of magnetic quadrupole lenses. The introduction of strong focusing made possible a substantial reduction in the transverse dimensions of accelerator chambers—that is, a reduction in the weight of the magnets and, consequently, in the cost of the accelerators.

Electric field focusing is employed only for low-energy heavy particles in cyclotrons and in linear accelerators. The principles of such focusing do not differ from those used in electron optics. (See.)

M. S. RABINOVICH

focusing


focusing

 [fo´kus-ing] the act of converging at a point.isoelectric focusing electrophoresis in which the protein mixture is subjected to an electric field in a gel medium in which a pH gradient has been established; each protein then migrates until it reaches the site at which the pH is equal to its isoelectric point.

focus

1. The point at which rays of light converge after passing through a convex lens to form a real image (real focus), or diverge from (virtual focus) after passing through a concave lens. 2. The centre or starting point of a disease process. 3. To adjust an optical system (e.g. camera or projector) in order to obtain a sharp image. Plural: foci. Syn. focusing. See confocal; principal focus; focal line.
aplanatic foci A pair of conjugate object and image points for which an optical system is free of spherical aberration. Syn. aplanatic points.
dark focus See resting state of accommodation.
depth of focus See depth of focus.
principal focus The axial image point produced by an optical system of an infinitely distant object (the second principal focus or posterior principal focus), or that axial object point for which the image will be formed at infinity (the first principal focus or anterior principal focus). A converging optical system or lens has two principal foci that are real. A diverging optical system or lens has a second principal focus that is virtual. In curved mirrors the two principal foci coincide. Depending upon whether the object is at infinity or at the principal focus, this same focal point becomes either the second principal focus or the first principal focus, respectively. Syn. focal point. See focal length; equivalent power; sign convention.
real focus See focus.
sagittal focus; tangential focus See oblique astigmatism.
virtual focus See focus.

Patient discussion about focusing

Q. My mind is getting confused now and i am losing on my focus. why is this change happening in me? I am a bipolar for the past 1 year. With the help of the medicines my episodes has come down. My mood is good and stable. Even my friends say that I am well as compared to previous years. But since last week I am not able to sleep well. My disrupted and reduced sleep is making me stressed. I just get 2-3 hours of sleep at night. After my lunch my tiredness starts again. My mind is getting confused now and I am losing on my focus. Why is this change happening in me?A. There are some possibilities that you are not taking your diet in time or your diet may not be nutritious as per your requirements. This can cause you to have increased stress and you can lose your sleep. This may increase the tiredness. Check if you are taking your medicines in right time. This can also be due to your stress. You may have stress due to your lifestyle too, which needs to be well managed in a healthy way. You can meet your doctor, as any increase in stress due to sleep deprivation can raise the chances of episodes to return back.
http://www.youtube.com/watch?v=YdO5m_mfaTQ&eurl=http://www.imedix.com/health_community/vYdO5m%5EmfaTQ_bipolar_disorder_facts?q=bipolar%20disorder&feature=player_embedded

Q. Is there a verity of exercises i can do with my child that would be helpful for him to be more focused and relaxed and by that help him to control the ADHD effects ? A. from our experience - any activity is a good activity...if he feels hyperactive during homework or studying, going out and running around the block will be enough for him. if he can't do that, doing push ups, situps, and even jumping in one place can help- although i must say it is irritating as hell... try practicing also breathing techniques in order to relax.

More discussions about focusing
FinancialSeefocus

focusing


Related to focusing: focussing
  • noun

Synonyms for focusing

noun the concentration of attention or energy on something

Synonyms

  • centering
  • focus
  • focussing
  • focal point
  • direction

Related Words

  • engrossment
  • immersion
  • absorption
  • concentration
  • particularism

noun the act of bringing into focus

Synonyms

  • focalisation
  • focalization

Related Words

  • intensification
  • refocusing
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更新时间：2024/9/21 19:53:17