STCB mining

1. STC in economics stands for short-term total cost

short term total cost STC refers to the total cost of procing a certain proct in a short term. It is the sum of fixed cost and variable cost. The short-term total cost increases with the increase of output, which is an increasing function of output<

definition

the short-term total cost refers to the lowest cost for a manufacturer to proce each output level under a given factory scale

the short-term total cost is expressed as: STC = f (q) + B

about the cost equation, it can also be expressed as

STC (q) = w · L (q) + R · K

2.

It means total short-term cost

total fixed cost (TFC) is the cost for manufacturers to purchase fixed proction factors. Because the quantity of fixed proction factors does not change with the change of proction in the short term, even if the manufacturer stops business, fixed costs still need to be paid, including interest on borrowed funds, depreciation, rent of plant and equipment, etc., so the total fixed costs remain unchanged

The short-term total cost is expressed as: STC = f (q) + B

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extended data:

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function form: TVC = TVC (q)

about the cost equation, it can be expressed as:

STC (q) = w · L (q) + R · K

TVC curve shows: because in the short term, manufacturers constantly adjust the input of variable elements according to the change of proction, so the cost equation can be expressed as:

STC (q) = w · L (q) + R · K

TVC curve shows that: in the short term, The total variable cost varies with the output. When the output is zero, the total variable cost is zero. After that, the total variable cost increases with the increase of yield

3.

Corresponding to the increasing stage of marginal return, STC curve decreases at an increasing rate

because at the beginning of the stage of increasing marginal return, the marginal proct generated by increasing a unit of variable factor input is increasing, and the increasing stage of marginal proct corresponds to the decreasing stage of marginal cost, and it decreases at an increasing rate

STC short-term cost curve shows the impact of output change on the minimum proction cost under a given operating environment and specific plant size. These curves reflect the lowest cost combination to proce a certain amount of output

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because the short-term marginal cost value of each proction is the slope of the short-term total cost curve, when the slope of STC curve changes from decreasing to increasing, SMC curve changes from decreasing to increasing, and at the inflection point C of STC curve, SMC reaches the minimum value in proction Q1

because STC curve can be obtained by vertical translation of vc curve upward, the two curves have the same slope in each yield. When SMC curve reaches the minimum value in Q1, vc curve, like STC curve, also has an inflection point D. Before point D, the slope of vc curve decreases; After point D, the slope of vc curve increases

4. What is STC operator? I only know that STC is the acronym of size, time and cost. So 4 the answer is ABC. Also, I know that when changes occur in the system, the first sequence will always change, so it is difficult to get creative answers. It's the same with a lot of life without creativity. It's like a fly trapped in a bottle, running left and right, and never finding a way out. Where is the way out? We can try to use STC operator to solve these problems.

5. 1. STC is the prefix of chip. STC Series MCU is the proct of Shenzhen Hongjing company. It's said that they bought the technology of SST company and improved it. It's a very good chip. I used to use Philips's MCU. Now when I develop new procts, I give priority to STC Series MCU.

2.8051 is a general term for MCS51 series MCU. 8051 generally has 8KB program memory, 128B data memory, 2 16bit timers, 2 external interrupts, 1 serial port...
2c2052 is a kind of factory batch number information, regardless of other information.

3. AT89C51 is about 5.0 yuan, STC89C51 is about 5.0 yuan (but many functions are added).

Hongjing company's network address: http://www.mcu-memory.com

6.

Corresponding to the increasing stage of marginal return, STC curve increases at a decreasing rate

under the condition of constant technological level, in the process of continuously increasing one variable proction factor to another or several constant proction factors, when the input of this variable proction factor is less than a certain value, the marginal proct brought by increasing the input of this factor is increasing; When the input of this variable factor increases continuously and exceeds this specific value, the marginal proction brought by increasing the input of this factor is decreasing, which is the law of diminishing marginal return

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Law of diminishing marginal returns: the law of diminishing marginal returns is also called the law of diminishing marginal returns, which means that if a kind of input factor increases continuously and equivalently, when it increases to a certain output value, the increment of the proct will decrease, that is, the marginal proction of variable factors will decrease. This is the famous law of diminishing marginal returns in economics

the so-called law of diminishing marginal returns refers to the fact that when the technology remains unchanged and the input quantity of other proction factors remains unchanged, the output increment brought by increasing the input of a certain proction factor is increasing at first, but after a certain point, the output increment brought by increasing the input of that factor will be smaller and smaller, or even negative. This economic phenomenon is known as the law of diminishing marginal returns, also known as the law of diminishing marginal returns

7. Of course, as long as the corresponding bit writes the register according to your settings, the corresponding port is the state you need.

8. Steel is an iron carbon alloy with carbon content between 0.04% and 2.3%. In order to ensure its toughness and plasticity, the carbon content is generally not more than 1.7%. Besides iron and carbon, the main elements of steel are silicon, manganese, sulfur and phosphorus. There are many kinds of classification methods of steel, the main methods are as follows:
1. Classification by quality
(1) ordinary steel (2) high quality steel (3) high quality steel
2. Classification by chemical composition
(1) carbon steel: A. low carbon steel; b. Medium carbon steel; c. High carbon steel
(2) alloy steel: A. low alloy steel; b. Medium alloy steel; c. High alloy steel
3. Classified by forming method
(2) forged steel 2) Cast steel 3) Hot rolled steel 4) Cold drawn steel
4. Classification by use
(1) construction and engineering steel: A. ordinary carbon structural steel; b. Low alloy structural steel; c. Reinforced steel< (2) structural steel
A. steel for mechanical manufacturing: (a) quenched and tempered structural steel b) Surface hardening structural steel: including carburizing steel, ammoniating steel and surface hardening steel c) Easy cutting structural steel d) Cold plastic forming steel: including cold stamping steel and cold heading steel; b. Spring steel; c. Bearing steel
(3) tool steel: A. carbon tool steel; b. Alloy tool steel; c. High speed tool steel
(4) special performance steel: A. stainless acid resistant steel; b. Heat resistant steel: including oxidation resistant steel, heat strength steel, valve steel; c. Electrothermal alloy steel; d. Wear resistant steel; e. Low temperature steel; f. Electrical steel
(5) professional steel, such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc< Comprehensive classification
(1) ordinary steel
A. carbon structural steel: (a) Q195 b) Q215(A、B)( c) Q235(A、B、C)( d) Q255(A、B)( e) Q275 < (2) high quality steel (including high quality steel)
A. structural steel: (a) high quality carbon structural steel b) Alloy structural steel c) Spring steel d) Easy cutting steel e) Bearing steel f) Special purpose high quality structural steel
B. tool steel: (a) carbon tool steel b) Alloy tool steel c) High speed tool steel
C. special performance steel: (a) stainless acid resistant steel b) Heat resistant steel c) Electrothermal alloy steel d) Electrical steel e) High manganese wear resistant steel< (1) by furnace type
A. open hearth steel: (a) acid open hearth steel; (b) acid open hearth steel b) Basic open hearth steel< B. converter steel: (a) acid converter steel b) Basic converter steel. Or (a) bottom blown converter steel b) Side blown converter steel c) Top blown converter steel
C. EAF steel: (a) EAF steel b) ESR steel c) Inction furnace steel d) Vacuum consumable furnace steel e) Electron beam furnace steel< (2) according to the degree of deoxidation and pouring system, it can be divided into
; b. Semi killed steel; c. Killed steel; d. Special killed steel< It can be divided into four categories: A. profiles, B. plates, C. pipes and D. metal procts
A. profile:
heavy rail, rail weighing more than 30 kg per meter (including crane rail); Light rail, rail weighing less than or equal to 30 kg per meter
large section steel: ordinary steel, round steel, square steel, flat steel, hexagonal angle steel, I-beam, channel steel, equilateral and unequal angle steel and rebar, etc. According to the size, it can be divided into large, medium and small steel
wire rod: round steel with diameter of 5-10 mm and wire rod
cold formed section steel: section steel made by cold bending steel or steel strip
high quality profile steel: round steel, square steel, flat steel, hexagonal angle steel, etc.
B. plate
thin steel plate, steel plate with thickness equal to or less than 4 mm
thick steel plate, steel plate with thickness greater than 4 mm. It can be divided into medium plate (thickness greater than 4mm and less than 20mm), thick plate (thickness greater than 20mm and less than 60mm) and extra thick plate (thickness greater than 60mm)
steel strip, also known as strip, which is actually long and narrow thin steel plate supplied in coils
electrical silicon steel sheet, also known as silicon steel sheet or silicon steel sheet
C. pipe:
seamless steel pipe, which is made of hot-rolled, hot-rolled, hot-rolled and hot-rolled silicon steel sheet Hot rolled cold drawn or extruded seamless steel pipe
welded steel pipe, rolled steel plate or steel strip, then welded steel pipe
D. metal procts
include steel wire, steel rope, steel strand, etc

9. Pnm0 = 0, pnm1 = 0 is set as quasi bidirectional port (that is, there is a weak pull-up resistance inside the chip, which can be read and written (also known as traditional 51 mode))
a bit mode can be set, for example:
P3m1 = 10100000b
p3m0 = 11 000000b
P3.7 is set as open drain (11), P3.6 is set as strong push-pull output (01), p3.5 is set as high resistance input (10), P3.4/p3.3/p3.2/p3.1/p3.0 is the standard two-way port / weak pull-up (00)

10. 1. Configure the trigger mode of external interrupt: top edge, bottom edge, high level, low level
2. The interrupt allow bit is on and the main interrupt switch is on
3. Input external trigger pin configuration is good (some SCM need to change the port to peripheral port instead of ordinary input port)< 4. Check whether the interrupt vector is correct.