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Excessive exposure to noise can damage ()

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4. The health-harmful sound; the sources of it: the modes of evaluating and limiting of noise it out- and in-door ambient

Background:

  • -  Although some Presbyacusis may occur naturally with age, in many developed nations the cumulative impact of noise is sufficient to Impair the hearing of a large fraction of the population over the course of a lifetime

  • -  Elevated workplace or other noise can cause hearing impairment, hypertension, ischemic heart disease, annoyance, and sleep Disturbance

• Changes in the immune system and birth defects have been attributed to noise exposure

  • -  The effects of noise on hearing vary among people → some people's ears are more sensitive to loud sounds, especially at certain frequencies

  • -  The frequency of a

... Continue reading "Excessive exposure to noise can damage ()" »

Concurrence of companies

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Chapter 18: Organizational Change and Stress Management

Forces for change:list a couple

Change:Making things different. 

planned change:Change activities that are intentional and goal oriented. 

Change agents:Persons who act as catalysts and assume the responsibility for managing change activities. 

Overcoming resistance to change.

Tactics can help change agents deal with resistance to change:

Communication:Communication is more important than ever in times of change. One study of German companies revealed changes are most effective when a company communicates a rationale that balances the interests of various stakeholders 

ParticipationIt’s difficult to resist a change decision in which we’ve participated. Assuming participants have the expertise... Continue reading "Concurrence of companies" »

Understanding Climographs: A Guide to Climate Analysis

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The graphic is a Climograph, a double entry graph that registers the average monthly temperatures through a red line for the scale of degrees centigrade (ºC) on the right; and the total average monthly precipitation by a bars graph in mm* in the scale on the left. According to the usual conventions, both scales are in a 2:1 ratio**, which allows to visualize easier the drier months.

The yearly average annual temperature is ………….. The average monthly temperature belongs to the month of …………….., with approximately ……….. ºC. Such data indicates that, the graphic’s clima is located in the Northern hemisphere, also with a hot/warm summer. The coldest month is ……… with ……….. ºC, which means a mild summer. According... Continue reading "Understanding Climographs: A Guide to Climate Analysis" »

The Hydrologic Cycle and Coastal Geology

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Hydrologic Cycle

Describe the path water moves land, ocean, atmosphere

Seawater

97.2%

Stream

Zone of Saturation

Point where 100% of the pore spaces are filled with water

Best Aquitard

Shale material

Connection Between Climate and Geologic Process

Heavy rainfall triggers debris flow

Cryosphere

Ice and snow existed on Earth

Shells

Made out of CaCO3

Shore and Coast

Shore: area from lowest tide to highest elevation

Coast: area of ocean-related features from the water inland

Coastline

Marks the seaward edge of the coast

Waves and Shoreline

Wave Height

Vertical distance between trough and crest

Wavelength

Horizontal distance between successive crests

Shoreline

Marks the contact between land and sea

Bending of Waves

Refraction

Aquifers and Hot Springs

Aquitard

Impermeable layer... Continue reading "The Hydrologic Cycle and Coastal Geology" »

Optimization and Hessian Matrix Calculations

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Written at on English with a size of 969 bytes.

syms K L

[K,L]=meshgrid(0:0.1:10);
Q=10*(K1/4)*(L1/2);
mesh(K,L,Q)
contour(K,L,Q)
meshc(K,L,Q)
syms K L;
Q=10*(K1/4)*(L1/2);
diff(Q,K)
hessiana=jacobian(jacobian(Q,[K,L]),[K,L])
subs(hessiana,[K,L],[2,1])


syms x y;
f=4*x2+y2+2*x*y-3*x-y+1;
[x,y]=solve(diff(f,x),diff(f,y),x,y)
syms x y;
hessiana=jacobian(jacobian(f,[x,y]),[x,y])
eig(hessiana)
vpa(ans)


syms x y lambda;
f=x2+y2-2*x-x*y+5;
L=f-lambda*(x+y-1);
[lambda,x,y]=solve(diff(L,lambda),diff(L,x),diff(L,y),lambda,x,y)
 syms x y lambda;
hessiana=jacobian(jacobian(L,[x,y]),[x,y])
eig(hessiana)

Automatic Voltage Control and Generation Control in Power Systems

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Automatic Voltage Control

Basically consists of a main exciter field which excites the alternator field to control the output voltage. The exciter field is automatically controlled through an error equal to V reference - Vt. When the output voltage is higher than the required value, the BT is measured by a potential transformer and fed back to the input so that the error V reference - Vt is applied to the exciting field. This ensures that the generator output voltage is maintained at the desired level.

Components:

  • Potential Transformer: Provides a sample of terminal voltage
  • Differentiating Device: Gives actuating error e = V ref - Vt
  • Error Amplifier: Amplifies the error signal
  • SCR Power Amp: Transfer Function = (ke / 1 + TeS)

Automatic Generation

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NFPA 5000 Building Construction and Safety Code Overview

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This document provides minimum design regulations to safeguard life, limb, health, property, and public welfare. It provides information for regulating and controlling the permitting, design, construction, quality of materials, use and occupancy, location, and maintenance of all buildings and structures within the authority of jurisdiction (AHJ). It also regulates certain specific equipment within all buildings and structures.

Fire Alarm Control Unit

In most cases, the fire alarm control unit, not the device, performs the actual determination of the alarm state.

Detection Devices

Line detectors- Detection is continuous along the entire length of the detector in these detection devices. Typical examples may include certain older pneumatic rate-of-... Continue reading "NFPA 5000 Building Construction and Safety Code Overview" »

Craniometric points

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In the neurocranium acknowledge the following points Craniometric sagittal (Fig. 1), (Fig. 2), (Fig. 3), (Fig. 4) Nasion: Intersection of frontonasal sutures and internasal. Glabella: most prominent point of the frontal in the midsagittal plane. It is located on the brow ridges between. Bregma: Intersection of sagittal and coronal sutures. Vertex: Point skull highest average in the mid-sagittal plane. Lambda: Intersection of sagittal and lambdoid sutures. Opistocranio: Point of the squama occipital in the sagittal plane is farthest from the glabella point. May coincide with the point Inion. Inion: A Meeting of the line occipital (nuchal) exceeding the median sagittal plane. Generally corresponds to the external occipital protuberance. Opisthion:

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365 days

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 our planet is called earth.We can live on eartn becouse there is water and oxygen.Earth the only planet where we can breathe.daytime and night time: earth is alwaysmoving.It rotates on its axis.Its axis an imaginary line between the north pole and the south pole.The axis is tilted.We have daytime and night time becouse earht is rotating.It takes 24 hours to make a complete rotation.When one half of earht faces the sun the other half doesn't face the sun.The half that aces the sun has light so it's daytime.The half that dosen't face the sun dosen't have light so it's night time.the seasons:while earth rotates on its axis,it also moves around the sun.It takes 365 days for earth to go all the way around the sun.We have seasons becouse earht
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