the design of everyday things by don norman pdf
The Book of Odds: From Lightning Strikes to Love at First Sight, the Odds of Everyday Life by Amram Shapiro
Ngày tải lên :
03/04/2014, 17:15
... Summary of
Tense Conventions
At its heart, the invention of a reference work is
really the invention of a set of conventions
followed by their application with relentless
consistency. This is the ... know they have it.
Get tested:
The odds a female 15–44 has been tested for
HIV and other STDs in the past year are 1 in
10.5.
The odds a male 15–44 has been tested for HIV
and other STDs in the ... randomly
and collect their numbers humbly
and confess how wrong they may be honestly
and report what they see whether it is
what they wished for or not
and share what they find with all of us
so we may...
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Tài liệu The message of a master - By John McDonald pdf
Ngày tải lên :
15/12/2013, 06:15
... as the beasts of the field, the
birds of the air and the fish of the sea are bountifully
supplied. For any man, no matter what his station in life, to
take the stand that it is the destiny of ... keeps the airplane soaring.
Without resistance, it could not fly. Neither could the birds;
or the fish swim; or you walk. As the power of the engine
increases, the greater the momentum of the ... following pages are the result of a series of notes
collected and set down in the form of a story and a system
of practice, which accounts for the style of arrangement.
The sequential order...
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The design of mat foundations
Ngày tải lên :
16/10/2012, 10:43
... 119 pcf
Example 4.
Design the steel lying in the East-West direction of the mat shown below with external
dimensions of 42 feet by 74 feet. The columns are all 15 by 15”, the LF = 1.6, f
c
’ ... 0.00018y. Values are solved by plugging in the x and y values,
which these values are found by using the x-y coordinate system off the mat foundation.
Determine the average soil reaction.
... years, the dredged material from
nearby waterways and excavated soil from a
neighboring project sat on the mill site. The
material acted as a surcharge which compacted
the soil to the point of...
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Tài liệu The Design of Rolling Bearing Mountings P2 ppt
Ngày tải lên :
25/12/2013, 05:17
... accuracy of the workpiece mainly depend
on the axial rigidity of the spindle headstock and of the
rotary table. Therefore, the rigidity of the thrust bear-
ings is especially important. To increase the ... the expansion of the rotating parts
due to the effects of heat and centrifugal force do not
cause jamming of the outer rings in the housing.
Lubrication, sealing
The bearings are lubricated by ... on the roll-
ing bearing aspects of the applications. The operation
of the machine allows conclusions to be drawn about
the operating conditions which dictate the bearing
type and design, the...
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Tài liệu The Design of Rolling Bearing Mountings P1 pptx
Ngày tải lên :
25/12/2013, 05:17
... lubrication.
The labyrinth seal at the work end consists of ready-to-
mount, non-rubbing sealing elements. The inner laby-
rinth ring retains the lubricating oil, the outer laby-
rinth ring prevents the ... kN;
the bearings are vertically arranged.
Bearing selection
The axial load of 130 kN is made up of the weight of
the rotor and the two variable top and bottom fan im-
pellers as well as the thrust ... clearance
Due to the tight fits, the inner ring of the bearing is
expanded and the outer ring with the roller-and-cage
assembly is contracted. Thus the radial clearance of the
bearing is reduced...
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Science of everyday things vol 2 physics
Ngày tải lên :
19/01/2014, 13:04
... to the shoulder of the person who has fired
it—corresponding to the momentum of the bul-
let. Why, then, does the “kick” not knock a per-
son’s shoulder off the way a bullet would? Because
the ... Conservation
Laws
Then, as the ball hits the ground, the energy
is dispersed. Most of it goes into the ground, and
depending on the rigidity of the ball and the
ground, this energy may cause the ball ... make the situation
more plausible, the “Man of Steel” should have
been shown catching the person, then slowly fol-
lowing through on the trajectory of the fall
toward earth.
THE CRACK OF THE BAT:
INCREASING...
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Tài liệu The Design Of Manufacturing Systems P2 docx
Ngày tải lên :
19/01/2014, 18:20
...
Typically, the designer designs a product with minimal knowledge about the capabilities and limitations of
the manufacturing technology. The designer then tries to find out if the design can be ... ways of simplifying CSG models for their potential use in feature recognition.
ã Restrict the domain of the model by restricting the range of primitives and/or of the orientations
that they may ... beforehand, then the best configuration
of the spindles for the parallel machine tool can be deduced. The best configuration of the spindles could
be based on the types and number of features present on the...
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Tài liệu The Design Of Manufacturing Systems P1 pptx
Ngày tải lên :
19/01/2014, 18:20
... limited.
The case of shut down of an existing plant results when the variable W
it
takes a value of zero after a
given time period t. The economics of shut down can be modeled by the inclusion of the ... for
the production of each chemical. We might then contemplate the in-house production of some of the
required ingredients, forcing us to consider another tier of ingredients and by- products. The ... assumed that the production rate (r
ijt
) of the main product j of
each such scheme is proportional to the capacity of the plant.
where M
i
denotes the index set of main products of the alternative...
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Tài liệu The Science of Being Well - By Wallace D.Wattles doc
Ngày tải lên :
21/01/2014, 21:20
... fills the interspaces of the universe. This Sub-
stance is the Life of All, and is seeking to express more life in all. It is the Prin-
ciple of Life of the universe, and the Principle of Health ... life is the Principle of
Life of the universe. This Substance has created from itself all the forms of or-
ganic life by thinking them, or by thinking the motions and functions which
produce them.
Original ... control his attention by the use of
his will.
He can decide what things he will think about.
www.scienceofbeingwell.net The Science of Being Well 24
visible by the transformation of the physical body...
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