Single cycle means that n teams participating in the competition must meet once every two. The required number of games is a combination of two out of N. If there are three games of A, B and C, the specific number of games is as follows: A-B, A-C, B-C. That is, one game is played between teams, and the required number of games is C-3-2 (a combination of two out of three, * * 3 games), and so on.
What does one cycle mean?
There is only one refrigeration system in a single cycle, and the flow direction of refrigerant is compressor-condenser-filter-capillary-evaporator-compressor.
The double circulation is two capillaries of pressure-condenser-filter-solenoid valve-cold storage and freezing, which are connected to the cold storage or freezing chamber respectively. The control mechanism controls the steering of the electromagnetic valve to control the temperature of the cold storage and freezing, and then flows back to the press.
The dual system can control the freezing temperature of the refrigerator more accurately.
What does the single round robin system mean?
The single round robin system means that all participating teams can meet once in the competition, and finally rank according to the scores and wins and losses of each team in the competition. Generally speaking, there are not many single cycles for the participating teams, and there is enough competition time to use them. Single round is a fair and reasonable competition system because all teams have the opportunity to meet [1].
What are single round robin and double round robin?
Round robin system means that each team can compete with other teams once or twice, and finally calculate the ranking according to the results. This kind of competition is reasonable, objective and fair, which is beneficial for teams to learn from each other and exchange experiences.
The round robin system includes three ways: single cycle, double cycle and grouping cycle.
single loop
Single cycle means that all participating teams can meet once, and finally rank according to the points and gains and losses of each team in all competitions. If there are not many teams and the time and venue are guaranteed, this kind of competition is usually adopted.
Calculation of the number of rounds in a single round-robin competition
If the number of teams is even, the number of rounds is the number of teams minus 1.
For example, if 8 teams participate in the competition, the number of rounds is 8- 1=7.
If the number of teams is odd, the number of rounds is equal to the number of teams.
For example, if five teams participate in the competition, it will take five rounds.
The purpose of calculating the number of rounds is to calculate the total time required for the game.
For example, there are seven participants in the competition, and the number of rounds is seven. If there is a two-day break in the middle of the game, the total time of the game is nine days.
Calculation of the number of single-cycle games
The formula for calculating the number of players in a single round-robin game is: x = n (n-1 )/2, that is, the number of players * (the number of players-1 )/2.
For example, 8 teams participate in the competition, and the total number of competitions is:
The purpose of calculating the number of games is to calculate the number of venues needed for the game, and then consider the number of referees and how to arrange the game schedule.
Arrangement of single round robin
Generally, the arrangement of single-cycle competition sequence adopts rotation method.
No matter whether the teams are even or odd, they should be ranked even. If it is an odd number, you can add a "0", and the team that meets a "0" will have a bye.
For example, there are 8 teams participating in the competition, as shown in table 1- 1. Chart display
This rotation method is suitable for teams that don't know each other's strength, so it is very likely that the strong teams will meet in advance by drawing lots and positioning.
"Counter-clockwise rotation", which can keep the final game exciting, is a common arrangement method (Table 1-2). Chart display
When there are five teams participating in the competition, they can be arranged by adding "0", as shown in Table 1-3. Chart display
The following methods can usually keep the final competition exciting, which are common arrangement methods, as shown in Table 1-4. Chart display
In order to avoid uneven work and rest, you can also put "0" in the lowest position on the far right and keep it still.
After the round-table meeting is arranged, each team draws lots, fills in the round-table meeting according to the number drawn by each team (or determines the number according to the ranking order of the last game), and then prepares the competition schedule. When compiling the competition schedule, we should first implement the principle of equal opportunity and fair competition, and of course, we should also take care of the needs of the competition (audience) appropriately. We can adjust the time (morning, afternoon, evening), venue (large or small pavilion), region (local or foreign) and other aspects to achieve a general balance between teams.
In the arrangement, the interval between rounds should be considered to ensure that athletes have enough rest time. If the competition cycle allows, you usually have to take a day off after three rounds. The color of the clothes should be implemented according to the rules, that is, the top team (home team) of the squadron in the order book should wear dark clothes. Pay attention to leaving time for washing and drying when finishing.
Table 1-5 is a more formal competition schedule format. Chart display
Domestic and international circulation
Double cycle means that all teams can meet twice, and finally rank according to the points and gain and loss rates of all teams in the two cycles. If there are few teams or more competition opportunities, double-cycle competition is usually adopted.
At present, the national men's basketball League A adopts the home and away game system, and the first stage of the preliminaries and the 9~ 12 relegation game adopt the double round robin system.
The number of rounds, the number of games and the competition time of double round robin are all multiples of single round robin.
Grouping period
The grouping cycle is to divide all the participating teams into several groups for the first-stage preliminary contest, and then for the second-stage finals between the winning teams in each group, so as to determine the ranking below 1. In the group preliminaries, the single round robin system can be adopted, and in the finals, the single round robin system, the second namesake competition and the cross competition system can be adopted, so it is also called the mixed round robin system or the "two-stage system". Group cycle is suitable for competitions with many teams, and it can complete the competition tasks reasonably and fairly in a short time.
The disadvantage of grouping cycle is the participating teams. ......
What does a unicyclic graph mean?
Batch pictures are sequentially and circularly scrolled in one direction; Open from top, bottom, left and right respectively. Single cycle. Much like the effect of slowly opening a picture in a page;
What is a single round robin?
Two or more teams or any two players have to play a game, understand?
What is the single-cycle elimination system?
Single round robin system: all teams compete with each other once, that is, the single round robin system.
(1) Formula for calculating the number of matches in a single round robin: number of matches = number of teams (number of teams-1)/2.
(2) Calculation method of the number of rounds in a single round robin: when the number of teams is odd, the number of rounds is equal to the number of teams; When the number of two teams is equal, the number of rounds is equal to the number of two teams minus 1.
(3) Arrangement method of single round robin:
① General arrangement method. Use "counter-clockwise rotation method" to arrange, and first use * * * as the code name instead of the team name. Divide the number of teams into equal sides according to the U-shaped trend. In the case of odd-numbered teams, the last digit plus 0 becomes an even number. In the first round, as long as a horizontal line is drawn between the opposing U-shaped teams, it is the order of the first round. In the second round, the number 1 in the upper left corner is fixed, and the rest of the numbers move one position counterclockwise, which is the order of the second round, and so on in subsequent rounds. In case of team O, the team will have a bye.
For example, there are 7 teams participating in the competition, and the competition order is as follows:
The first, second, third, fourth, fifth, sixth and seventh rounds.
1—0 1—7 1—6 1—5 1—4 1—3 1—2
2—7 0—6 7—5 6—4 5—3 4—2 3—0
3—6 2—5 0—4 7—3 6—2 5—0 4—7
4—5 3—4 2—3 0—2 7—0 6—7 5—6
The advantages of using counterclockwise rotation method are that each team has the same progress, simple arrangement method and easy operation and inspection. However, when there are more than five teams in the odd number, the team with the second lowest will play against the team in the last round, such as the team represented by the above number 6. This has caused unfair competition in ball games. In order to solve this problem, most of the current competitions adopt the "Berger arrangement method".
What is a single round robin?
That is, five teams in the competition group play a game without repeating each other. For example, there are four teams A, B, C and D: A-B C-D.
B-D exchange center
A-D B-C
Calculate the score and rank after each comparison! ! !