What is the phenomenon of flying temperature, and what is the phenomenon of six chaos

The phenomenon of flying temperature refers to the phenomenon that when the reactor is in an unstable operating state, when there is a small disturbance in the operating parameters, the temperature in the local part of the reactor or the whole reactor will rise significantly.

Extension of knowledge points:

Flying temperature is caused by the reaction system being in a "polymorphic" state under operating conditions, and it is largely generated by the interaction of the heat of reaction effect with the heat transfer process. It often leads to disruption of normal operation and even burns out the catalyst. This can be prevented by theoretical analysis.

Causes of the phenomenon of flying temperature:

1. The sudden decrease in the amount of circulating hydrogen makes it impossible to carry the heat;

2. The sudden reduction or interruption of raw oil and new hydrogen makes the system less cold material and breaks the equilibrium and causes flying temperature;

3. The sudden change in the composition of the raw oil causes a sudden increase in reaction heat;

4. The outlet temperature of F-101 is super high;

5. The quenching hydrogen regulating valve fails;

6. The activity of the catalyst is unstable, and the sudden increase of activity at some points aggravates the reaction, and the local overheating causes flying temperature;

7. The reaction raw material or circulating hydrogen is unevenly distributed on the cross-section of the catalyst, resulting in local superheating and flying temperature.

"Six chaotic phenomena"Generally refers to indiscriminate construction, indiscriminate stacking, indiscriminate stalls, indiscriminate pulling, indiscriminate hanging, indiscriminate pasting, graffiti, and littering.

In the process of rapid urban development, especially in the early stage of urbanization development, because urban management has not kept up with the pace of urban development, some units, citizens, traveling merchants, construction units and shop operators in the city seek personal interests or small collective interests.

Wantonly occupy urban public space, block urban traffic and sight, produce a large amount of garbage and sewage, resulting in a serious phenomenon of "dirty, messy and poor" in the city, making the city in a state of chaos and disorder, and seriously affecting the normal operation of the city.

Six chaos: disorderly selling, disorderly stopping, disorderly supercharging, disorderly building.

Hope you like :)

What do you mean? Let's make it clear.

"Six chaotic phenomena"It refers to the six aspects of urban management, and it is also the main content of the current urban environmental improvement.

The first is all kinds of random construction phenomena. For example, unapproved posts, kiosks, light boxes, street signs, electronic display boards (screen) advertisements; temporary gatehouses, archways, flower stands, and flower galleries that obstruct traffic and fire fighting; Temporary structures (structures) within 10 meters of the port along the road and the road; Advertisements on irregular canopies, scaffolding, pedestrian bridges, and overpasses.

The second is the phenomenon of all kinds of indiscriminate selling. For example, stalls operating without a license; Stores that stack goods beyond the threshold; bicycle and motorcycle repair and occupation operations; Temporary occupation of the road in excess of the approved area; Restaurants occupy the road.

The third is all kinds of random parking. For example, unauthorized installation of obstruction of traffic, encroachment on municipal roads and sidewalks, public green space, public land "three-car" storage stations, temporary parking spots. Do not park motor vehicles and non-motor vehicles in designated locations.

Fourth, all kinds of indiscriminate hanging phenomena. For example, streamers (flags) set up (pulled) without approval and outdoor advertisements hung on power poles, telecommunication poles, tram poles, and street lamp poles; banners across the road; Hang expired banners, slogans, and set up clothes to dry on trees and sidewalks.

Fifth, all kinds of indiscriminate digging phenomena. For example, construction and decoration materials that occupy roads and sidewalks; Uncleaned muck, spoil, discarded material, sludge and other wastes after road excavation, dredging ditch manholes, underground construction, and drilling control operations; domestic waste of units and residents; Cultivating and pruning the soil, branches, etc. produced by street trees, hedges, flower beds, grass, etc.

Sixth, all kinds of indiscriminate posting. For example, small advertisements on the road, fresh krafts in the community, advertisements and street signs posted by various unapproved units and individuals. ‍

If for the exothermic reaction, the reaction material is carried out in the fluidized bed, and the fluidization state is not good, the fluidized bed reactor has a trench flow phenomenon, resulting in a sharp increase in the local bed temperature, and the reaction temperature is higher than that of other reaction parts, which is the flying temperature phenomenon.

Usually, multiple temperature probes are set on the same section of the fluidized bed, and the fluidization state of the fluidized bed is judged according to the temperature, especially in industrial production.

When the pacing impulse of the high pacemaker suddenly stops, and the low potential pacemaker begins to release the impulse, its frequency is slower than its natural frequency, and then gradually returns to its natural frequency, this phenomenon is called the phenomenon of warm awakening.

How to distinguish sinus reentrant supraventricular tachycardia from sinus tachycardia, especially when the awakening phenomenon is not recorded, it can be accompanied by atrial fibrillation. Diagnosis: paroxysmal supraventricular tachycardia in which atrial and borderline tachycardia cannot be determined.

First-in, first-out algorithm (FIFO). Select to load the oldest page displacement. You can use a linked list to indicate the order in which each page was loaded.

The performance of FIFO is poor because the pages that are called in earlier tend to be frequently accessed, and these pages are repeatedly called in and out under the FIFO algorithm, and there is the belady phenomenon. The so-called belady phenomenon refers to the fact that when the FIFO algorithm is used, if all the pages required by the process are not allocated, sometimes the number of allocated pages will increase but the page missing rate will increase.

The belady phenomenon can be formally described as follows: a process user wants to access m pages, and the OS allocates a memory page to process p; For a visit sequence, the number of missing pages is PE (occupancy, n). When N increases, Pe(S,N) sometimes increases and sometimes decreases.

The reason for the Belady phenomenon is that the displacement feature of the FIFO algorithm is contradictory to the dynamic feature of the process accessing memory, that is, the displaced page is not one that the process will not access.

phenomenon [xiàn xiàng] means: everything that a thing manifests and can be felt. Phenomena are something that people can see, hear, smell, and touch. Phenomena can be divided into natural phenomena and social phenomena according to whether they have natural attributes or not.

1. Basic Interpretation of Phenomena:

1. The external form of things in the development and change.

2. Observable facts or events; An experienced or actual thing.

3. Gods, Buddhas, Bodhisattvas, etc. appear in the world.

2. Explanation of the phenomenon:

The external form of things in their development and change.

"Speech to the First Class of Students of the Marxist-Leninist Institute": "There are also universal truths in history, and we must use Marxism to analyze historical phenomena. ”

3. Examples of phenomenal usage:

1. Corruption is a social phenomenon, and it is impossible to eradicate the roots.

2. The phenomenon of selling children and girls in the old society is not uncommon.

1. Phenomena have four meanings.

Second, the first is that gods, Buddhas, and Bodhisattvas appear in the world. The second is the external form of people or things in the process of development and change. The third is the cultural and artistic circles, which refers to the social effects caused by certain creations or research.

Galliani said after the game: "I didn't see Ambrosini's last goal (editor's note: it was actually Molinaro's own goal, but Italian TV recorded it as Ambrosini's), today we won an important three points, we are in good form, we have 19 points in the last seven rounds, Ronaldo started for AC Milan for the first time and he did really well, today we know why he is called a 'phenomenon'

It is rare for a superstar like him to show superhuman adaptability and the technical level that he still has at the end of his career after going through so many transfers and changing to several top giants!!

So it's a phenomenon!!

He's strong, that's a phenomenon.

Hehe, a phenomenon is a phenomenon. Just one word.

If the reaction temperature is high and the reaction material is carried out in the fluidized bed, when the fluidization state is not good, the fluidized bed reactor has a ditch flow phenomenon, resulting in a sharp increase in the local bed temperature, compared with other reaction parts, this is the flying temperature phenomenon, and the fluidized state of the fluidized bed is judged according to the temperature, especially in industrial production.

1. Legal phenomena refer to the appearance of fingering in real life and directly perceived by people.

2. Legal phenomena are superficial and changeable, and people can perceive them through their senses. Legal phenomena are diverse.

2 1 According to the different forms of their existence, legal phenomena can be divided into:

legal concept phenomenon (legal awareness, legal concept, legal culture, etc.);

legal normative phenomena (various legal norms, legal departments, legal systems, etc.);

the phenomenon of legal form or source (customary law, case law, statutory law, etc.);

phenomena of legal relations (legal relations, legal procedures, etc.);

the phenomenon of legal acts (legal acts, illegal acts, etc.);

Legal phenomena (legislation, law enforcement, law-abiding, legal supervision, etc.).

2 2 From the static and dynamic point of view, legal phenomena can be divided into:

Static legal phenomena, such as various laws and regulations;

Dynamic legal phenomenon. Such as the formulation and implementation of laws, legal supervision, legal acts, legal relations, legal order, etc.

Law is a system of norms enacted or approved by the state and guaranteed by the coercive power of the state, reflecting the will of the ruling class determined by specific material conditions of life. [1] Law is the embodiment of the will of the ruling class and the ruling instrument of the state.

Legal phenomena are the outward manifestations of legal relationships.

Horizontal: the relationship between law and society, and the relationship between law.

Vertical: the history of the development of the law, etc.

When the amplifier circuit is short-circuited at the input end (i.e., when there is no input signal), the output terminal is measured with a sensitive DC meter, and a slowly changing output voltage is generated, which is called the zero drift phenomenon.

The change of semiconductor device parameters caused by temperature change is the main reason for the phenomenon of zero drift, so it is also called zero drift as temperature drift, referred to as temperature drift. Temperature drift refers to the change of transistor parameters caused by the change of ambient temperature, which will cause the instability of the static operating point, the dynamic parameters of the circuit are unstable, and even the circuit cannot work normally.

Zero drift is a phenomenon in which the amplifier circuit is short-circuited at the input (i.e., when there is no input signal) and the output is measured with a sensitive DC meter, and a slowly changing output voltage is generated. The signal with zero drift will be transmitted between the circuits of the various levels of amplification, and after multiple stages of amplification, it will become a larger signal at the output.

Temperature drift generally refers to the change of transistor parameters caused by the change of ambient temperature, which will cause the instability of the static working point, the instability of the dynamic parameters of the circuit, and even the failure of the circuit to work normally. When the temperature increases, the current amplification factor of the transistor increases, and the Q-point increases. On the contrary, it decreases.

The concept of zero drift (zero drift) can be described as: when the input signal of the amplification circuit is zero (that is, there is no AC input), due to the influence of temperature changes, power supply voltage instability and other factors, the static working point changes, and is amplified and transmitted step by step, resulting in the voltage at the output end of the circuit deviating from the original fixed value and drifting up and down It is also referred to as: zero drift.

In the case of serious drift, the effective signal is often "drowned", so that the amplification circuit cannot work normally. Therefore, it is necessary to find out the causes of zero drift and the ways to suppress it.

Temperature drift generally refers to the change of transistor parameters caused by the change of ambient temperature, which will cause the instability of the static working point, the instability of the dynamic parameters of the circuit, and even the failure of the circuit to work normally. Generally speaking, as the temperature increases, the current amplification of the transistor increases, and the q-point increases; On the contrary, it decreases. This part of the extra current is caused by a temperature change, understood as a temperature drift.

The phenomenon in which the input voltage is zero and the output voltage is not zero and changes slowly is called zero drift.

When the input voltage is zero, the output voltage is not zero and changes slowly due to the change of semiconductor device parameters caused by temperature changes, which is called temperature drift. It is the main cause of zero drift.

The methods to suppress zero drift are:

Introduce DC negative feedback into the circuit;

The temperature compensation method is adopted, and the thermal element is used to offset the change of the amplifier tube;

A "differential amplification circuit" is adopted.