I was taking an outdoor photo during the day with a deeply overcast day. A coloured wall will give the light a colour tint.Daylight shines 100% of the time the shutter is open and a flashgun can shine for 1% of the time. Quality street sweets are famous for providing different colour wrappers that can be used for different effects.Fast and Slow:?What I am really referring to is the duration of the light, ie how long the light is shining while the photograph is being taken. This is achieved by under or over exposing the subject. This can produce a surreal effect.

 

An unabridged version of this article?and others can be found at:?John's Blog on 'One Light'All this with just one light; just think of the variations with two or more lights.The distance from the source to the reflecting surface and then to the subject, compared to the distance from the source light to the subject, will greatly affect the strength of the reflected light. A textured surface will give a soft weak light. In most cases though, you will get a combination of two lights; China led grow light full spectrum Manufacturers one shining 100% and the other a fraction of the time. A shiny surface will give a hard strong light. I place two flashguns with orange gels and the photograph turned from a dull picture to one that looked as though it had been taken late in the evening with a lovely warm glow.Front, Side and Rear: Choose the position of the main light.?Explore,?discover and understand. Each position will create a very different effect, from fully lit to silhouette. Often the form comes from the outline of the subject.Explore my website to see some of these effects in practice in the Galleries.

The details of the subject are either blown out or in deepest shadow.Invisible: Infra Red is not visible to the naked eye, but filters can be attached to a camera which allows that light to be picked up on the sensor or film.So there we have it, a lightening, fast pass over variations with just one light. Different surfaces reflect different amounts of infra-red.Direct and Reflected: Direct light comes from your source light and usually has an obvious effect. Reflected light will come from any other surface that is not totally black. Explore making your own photographs with just one light. Reflected light can be used to fill in shadows.Placing coloured gels over?a flashgun colours the?light and will produce different effects.Low and High Key: This is were the tones of the photograph are primarily dark or bright.

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Tolerances in today's high-pressure hydraulic systems require strict control of system contamination. Prior to startup, contaminants built into the system must be removed during manufacturing and assembly to ensure that the system has proper and predictable performance throughout its useful life. New or rebuilt hydraulic systems should be flushed before operation.

Typical instructions state that flushing must be performed at a normal system fluid speed for a certain period of time and a certain degree of filtration. More stringent specifications may require specific levels of fluid contamination and need to be documented through fluid contamination analysis. Flushing instructions typically specify the level of system cleanliness that must be achieved, and sometimes the fluid speed that must be maintained during the flushing process. The concept of flushing is to loosen and remove contaminant particles inside the system by forcing the flushing fluid through at high speed. Theoretically, this keeps the inner wall of the fluid conductor as clean as the new fluid to be installed.

One disadvantage of all these flushing methods is that they are based on a cleaning fluid procedure, but ignore the internal cleanliness of the system. Even with the greatest degree of visual care during pipe and conduit installation, the human eye can only see particles larger than 40 µm. Even the roughest and most basic hydraulic systems require far less than this level .

Experience has shown that dimensionless Reynolds numbers (and other factors) are used to classify fluid flows as laminar, turbulent, or transitional flows (between the two). The Reynolds number depends on the viscosity and speed of the fluid and the ID of the pipe. These flushing speeds are not sufficient to ensure the cleanliness of the inner diameter (ID) of the system conductor. A brief review of basic fluid dynamics can explain why.

The speed must be high enough to reach a Reynolds number (NR) of 3,000 or more. Reynolds numbers flow during the transition between 2,000 and 3,000. The speed must reach or exceed the normal design speed of the system fluid. When the Reynolds number is greater than 3,000, the flow becomes disordered, which is defined as the situation where the fluid flow line is no longer orderly.

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When the shrinkage of the casting in the mold is only subject to the frictional resistance between the metal surface and the mold surface, it is free shrinkage. If the shrinkage of the casting in the mold is also hindered by other obstacles, the copper casting is called hindered shrinkage. For the same alloy, the hindered shrinkage is less than the free shrinkage.

The basic principle of preventing shrinkage porosity and shrinkage porosity in castings is to formulate the correct casting process according to the shrinkage and solidification characteristics of the alloy, so that good shrinkage conditions can be established during the solidification process of the casting, and shrinkage porosity can be transformed into shrinkage porosity as much as possible.

 

The shrinkage cavity appears in the final solidification of the casting. In this way, a riser of a certain size is placed at the place where the casting finally solidifies, and the aluminum casting makes the shrinkage cavity concentrated in the riser, or the gate is opened in the final solidification place to feed directly. In order to establish good feeding conditions for castings during solidification, the main reason is to control the solidification direction of castings to conform to the "directional solidification principle" or "simultaneous solidification principle".
The introduction position of the gating system has an important influence on the temperature distribution of the casting. Adjusting the pouring temperature and pouring speed of liquid metal can enhance directional solidification or simultaneous solidification.

A riser is set on the thick wall of the casting or at the hot joint. The aluminum casting is the most effective process to prevent shrinkage and shrinkage. The comprehensive use of risers, subsidies and chilled iron are effective measures to eliminate shrinkage and porosity in castings.

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What are the four elements of buying stainless steel hardware accessories?
Four elements for purchasing stainless steel hardware accessories:

 

1. The installation of hardware accessories should be complete, standardized, reliable, and accurate. After installation, the doors and windows have beautiful appearance, flexible and convenient opening, without deformation, obstruction and collision.

 

2. When choosing hardware accessories, try to choose products with guaranteed quality. The quality level of hardware accessories should be consistent with the quality level of doors and windows. The structure and shape of aluminum alloy door and window accessories should match the profile, the color is coordinated and beautiful, and the function is correct. , Flexible operation and convenient installation.

 

3. The exposed fasteners of hardware accessories should be made of stainless steel.

 

4. Multi-locking points should be used when closing casement doors and windows and large sliding doors and windows, otherwise the air-tightness will be greatly reduced under the action of negative pressure difference. Considering easy operation, it is best to use multi-locking point handles or actuators.

 

The 4 major elements of the selection of stainless steel hardware accessories are shared here. If you want to choose hardware accessories, you can refer to the above 4 major elements.

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How to do the pretreatment of stainless steel hardware accessories electroplating processing?

How to do the pre-treatment of the electroplating processing of stainless steel hardware accessories? It is everywhere in our lives. Do you know how the electroplating processing of hardware accessories is? How can we do the pre-processing? Let's take a look at Gao Jinli together. What does the hardware accessory manufacturer say.

 

1. The pre-treatment of the electroplating processing of stainless steel hardware accessories should be done well. The cleaner the substrate is processed, the full exposure of the atoms of the substrate metal is the key to the good adhesion of the subsequent plating.

 

2. Pay attention to the matching of plating metal and base metal during electroplating.

Stainless steel hardware accessories

3. The plating process of stainless steel hardware fittings should pay attention to the matching between different coatings when stacking different coatings. The former coating should be cleaned, and if necessary, weak etching should be carried out to eliminate the oxide film of the previous coating.

 

4. If high-temperature baking is to be performed, the stress between the product and the coating should be considered. For example, after zinc or aluminum alloy electroplating, it cannot be baked at too high a temperature.

 

5. When the electroplating process of stainless steel hardware accessories needs to be baked, the baking temperature should also be paid attention to.

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When it comes to hardware accessories, everyone should be familiar with them, and they can be seen everywhere in our daily lives. However, if you want to say that the process of hardware accessories processing may not be familiar to everyone, hardware accessories manufacturers will take a look at the process of hardware accessories processing. .

Hardware accessories manufacturers

Hardware accessories processing flow:

1. The operator must first understand the correct operation method to avoid accidents, and check whether the clothing meets the requirements after entering the work post.

 

2. Before working, check whether the motion machinery is filled with lubricating oil, then start and check whether the clutch and brake are normal, and run the machine idling for 1-3 minutes. Operation is strictly prohibited when the machine is faulty.

 

3. When changing the mold, the power must be turned off first, and the new mold can be installed after the machine stops. After debugging, check whether the mold is symmetrical and reasonable.

 

4. When the machine is working, it is forbidden to reach into the working area of ​​the slider, and it is strictly forbidden to pick up and place the workpiece by hand. Standard tools must be used when picking and placing the workpiece in the die. If abnormal sound or malfunction of the machine is found, turn off the power switch for inspection immediately.

 

5. Wait for unrelated personnel to leave the working area of ​​the machine and remove the debris from the workbench before turning on the power to start the machine.

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