According to American Society of Material Testing, it is defined as the process in which iron base alloys are heated 40 to 50°C above the upper transformation range and held there for a specified period and followed by cooling in still air at room temperature.
The heating of hypo-eutectoid as well as hyper-eutectoid steel is done above the upper critical temperature. The normalised steel consists of ferrite and pearlite for hypo-eutectoid, and pearlite and cementite for hyper-eutectoid steel.
The parts on which normalising treatment is carried out are:
(a) Normalising is generally carried out on large castings and forgings as it is cheap process. It is also applied to low and medium carbon steel parts.
(b) It is frequently applied as the final heat-treatment process on items which are subjected to relatively high stresses.
The objects of normalising are:
(1) To eliminate coarse grain structure obtained during forging, rolling and stamping.
(2) To increase the strength of medium carbon steel.
(3) To improve the machinability of low carbon steel.
(4) To improve the structure of welds.
(5) To reduce internal stresses.
(6) To achieve desired results in machanical and electrical properties.
The parts subjected to normalising treatment have higher yield strength, ultimate tensile strength and impact strength but ductility is somewhat reduced.
I determined the standard deviation and variance for each sample data set and it respective control. I want to display the data as a normalized ratio, ie unknown/control. Is there a way to determine the variance of the normalized value?
Thanks.
Mathematics, Statistics
Last week I went shopping in our small rural hometown, where my family has attended the same public schools since 1896. Without exception, all six generations of us — whether farmers, housewives, day laborers, business people, writers, lawyers, or educators — were given a good, competitive K-12 education.
But after a haircut, I noticed that the 20-something cashier could not count out change. The next day, at the electronic outlet store, another young clerk could not read — much less explain — the basic English of the buyer’s warranty. At the food market, I listened as a young couple argued over the price of a cut of tri-tip — unable to calculate the meat’s real value from its price per pound.
As another school year is set to get under way, it’s worth pondering where this epidemic of ignorance came from.
Our presidential candidates sense the danger of this dumbing down of American society and are arguing over the dismal status of contemporary education: poor graduation rates, weak test scores, and suspect literacy among the general population. Politicians warn that America’s edge in global research and productivity will disappear, and with it our high standard of living.
Yet the bleak statistics — whether a 70-percent high-school graduation rate as measured in a study a few years ago by the Manhattan Institute for Policy Research, or poor math rankings in comparison with other industrial nations — come at a time when our schools inflate grades and often honor multiple valedictorians at high school graduation ceremonies. Aggregate state and federal education budgets are high. Too few A’s, too few top awards, and too little funding apparently don’t seem to be our real problems.
Of course, most critics agree that the root causes for our undereducated youth are not all the schools’ fault. Our present ambition to make every American youth college material — in a way our forefathers would have thought ludicrous — ensures that we will both fail in that utopian goal and lack enough literate Americans with critical vocational skills.
The disintegration of the American nuclear family is also at fault. Too many students don’t have two parents reminding them of the value of both abstract and practical learning.
What then can our elementary and secondary schools do, when many of their students’ problems begin at home or arise from our warped popular culture?
We should first scrap the popular therapeutic curriculum that in the scarce hours of the school day crams in sermons on race, class, gender, drugs, sex, self-esteem, or environmentalism. These are well-intentioned efforts to make a kinder and gentler generation more sensitive to our nation’s supposed past and present sins. But they only squeeze out far more important subjects.
The old approach to education saw things differently than we do. Education (“to lead out” or “to bring up”) was not defined as being “sensitive” to, or “correct” on, particular issues. It was instead the rational ability to make sense of the chaotic present through the abstract wisdom of the past.
So literature, history, math and science gave students plenty of facts, theorems, people, and dates to draw on. Then training in logic, language, and philosophy provided the tools to use and express that accumulated wisdom. Teachers usually did not care where all that training led their students politically — only that their pupils’ ideas and views were supported with facts and argued rationally.
What else can we do to restore such traditional learning before the United States loses it global primacy?
To encourage our best minds to become teachers, we should also change the qualifications for becoming one. Students should be able to pursue careers in teaching either by getting a standard teaching credential or by substituting a master’s degree in an academic subject. That way we will eventually end up with more instructors with real academic knowledge rather than prepped with theories about how to teach.
And once hired, K-12 teachers should accept that tenure has outlived its usefulness. Near-guaranteed lifelong employment has become an archaic institution that shields educators from answerability. And tenure has not ensured ideological diversity and independence. Nearly the exact opposite — a herd mentality — presides within many school faculties. Periodic and renewable contracts — with requirements, goals and incentives — would far better ensure teacher credibility and accountability.
Athletics, counseling and social activism may be desirable in schools. But they are not crucial. Our pay scales should reflect that reality. Our top classroom teachers should earn as much as — if not more than — administrators, bureaucrats, coaches, and advisers.
Liberal education of the type my farming grandfather got was the reason why the United States grew wealthy, free, and stable. But without it, the nation of his great-grandchildren will become poor, docile, and insecure.
I have heard about PSB = runtime(seconds)/cpu speed(MHz) x 1000. I don’t know what is PSB and I’m not sure it can be used or not. Thanks.
I need the guidline for reading the Iron or steel code by the American society of testing & material
any one can tell me where I can find that , I’ve searched a lot in Google
which one should i go for?
are they sulfate free?
which one do you like?
I have heard about PSB = runtime(seconds)/cpu speed(MHz) x 1000. I don’t know what is PSB and I’m not sure it can be used or not. Thanks.
I have heard about PSB = runtime(seconds)/cpu speed(MHz) x 1000. I don’t know what is PSB and I’m not sure it can be used or not. Thanks.
They have normalized something that is severely abnormal. People think it’s normal to believe in this nonsense. If it wasn’t so evil, it would be a remarkable achievement; how did they do it?
They have normalized something that is severely abnormal. People think it’s normal to believe in this nonsense. If it wasn’t so evil, it would be a remarkable achievement; how did they do it?
I’ve finished a 9 month course on Roaccutane 1 week ago and had terrible symptoms of dry itchy red peeling skin, particularly on my arms and neck. These symptoms have not gone away after 1 week and I am terrified I will be stuck with them forever. Can anyone advise from their own experience? My dermatologist tells me it will normalise.
—–SKIP TO THE BOTTOM PART——-
V C Section 21212 Youth Bicycle Helmets Minors
Youth Bicycle Helmets: Minors
21212. (a) A person under 18 years of age shall not operate a bicycle, a nonmotorized scooter, or a skateboard, nor shall they wear in-line or roller skates, nor ride upon a bicycle, a nonmotorized scooter, or a skateboard as a passenger, upon a street, bikeway, as defined in Section 890.4 of the Streets and Highways Code, or any other public bicycle path or trail unless that person is wearing a properly fitted and fastened bicycle helmet that meets the standards of either the American Society for Testing and Materials (ASTM) or the United States Consumer Product Safety Commission (CPSC), or standards subsequently established by those entities. This requirement also applies to a person who rides upon a bicycle while in a restraining seat that is attached to the bicycle or in a trailer towed by the bicycle.
(b) Any helmet sold or offered for sale for use by operators and passengers of bicycles, nonmotorized scooters, skateboards, or in-line or roller skates shall be conspicuously labeled in accordance with the standard described in subdivision (a) which shall constitute the manufacturer’s certification that the helmet conforms to the applicable safety standards.
(c) No person shall sell, or offer for sale, for use by an operator or passenger of a bicycle, nonmotorized scooter, skateboard, or in-line or roller skates any safety helmet which is not of a type meeting requirements established by this section.
(d) Any charge under this subdivision shall be dismissed when the person charged alleges in court, under oath, that the charge against the person is the first charge against that person under this subdivision, unless it is otherwise established in court that the charge is not the first charge against the person.
(e) Except as provided in subdivision (d), a violation of this section is an infraction punishable by a fine of not more than twenty-five dollars ($25).
The parent or legal guardian having control or custody of an unemancipated minor whose conduct violates this section shall be jointly and severally liable with the minor for the amount of the fine imposed pursuant to this subdivision.
(f) Notwithstanding Section 1463 of the Penal Code or any other provision of law, the fines collected for a violation of this section shall be allocated as follows:
(1) Seventy-two and one-half percent of the amount collected shall be deposited in a special account of the county health department, to be used for bicycle, nonmotorized scooter, skateboard, and in-line and roller skate safety education and for assisting low-income families in obtaining approved bicycle helmets for children under the age of 18 years, either on a loan or purchase basis. The county may contract for the implementation of this program, which, to the extent practicable, shall be operated in conjunction with the child passenger restraint program pursuant to Section 27360.
(2) Two and one-half percent of the amount collected shall be deposited in the county treasury to be used by the county to administer the program described in paragraph (1).
(3) If the violation occurred within a city, 25 percent of the amount collected shall be transferred to and deposited in the treasury of that city. If the violation occurred in an unincorporated area, this 25 percent shall be deposited and used pursuant to paragraph (1).
This is the law about minors wearing a bicycle helmet, in California. Anyways, my question is about the 4th little part, part D; it says
“Any charge under this subdivision shall be dismissed when the person charged alleges in court, under oath, that the charge against the person is the first charge against that person under this subdivision”
Does that mean that you get away with your first offense scratch free?
I have heard about PSB = runtime(seconds)/cpu speed(MHz) x 1000. I don’t know what is PSB and I’m not sure it can be used or not. Thanks.
I have heard about PSB = runtime(seconds)/cpu speed(MHz) x 1000. I don’t know what is PSB and I’m not sure it can be used or not. Thanks.
Basically I conducted an experiment where I varied a parameter yg for different values of y1 to obtain values of Q. So Q is dependent on both yg and y1.
Can I normalise this data using standard score or student’s t-score?
Any help will be really appreciated.
I cannot use yg/y1 in this situation