IrisMiddleton - China Automobile Expert-CNAUTO

Q who invented the internal combustion engine first

IrisMiddleton Release Time: July 5, 2024, 4:37 AM

The internal combustion engine was first invented by Jean Joseph Étienne Lenoir in 1859. However, the version that is most similar to today’s engines was developed by Nikolaus August Otto in 1876.

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Q why does my engine burn oil

BeauFlynn

IrisMiddleton Release Time: June 28, 2024, 4:21 AM

Engines burn oil primarily due to worn components, leading to oil escaping past worn piston rings or valve seals into the combustion chamber, where it’s burned alongside the fuel. Ageing or high-mileage engines are particularly prone to this issue. Furthermore, using incorrect oil viscosity can exacerbate oil consumption. To mitigate, regularly check and top off oil levels. Consider using oil additives designed to reduce consumption in older engines. In severe cases, a professional mechanic’s assessment to repair or replace the worn parts is advisable. Regular maintenance and using manufacturer-recommended oil can help prevent excessive oil burning.

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Q what does the w in 5w-30 stand for

WalkerCarpenter

IrisMiddleton Release Time: June 25, 2024, 5:19 AM

The “W” in 5W-30 oil stands for “Winter.” This designation indicates the viscosity of the oil in cold temperatures, essentially how well it flows at the start-up when the engine is cold. The numeral before the W shows the oil’s flow at 0°F, signifying its cold-weather performance. The lower the number before the W, the better the oil performs in the cold. The number following the hyphen, in this case, 30, indicates the oil’s viscosity at 100°C (212°F), representing its performance at the engine’s typical operating temperature. This dual rating system, established by the Society of Automotive Engineers (SAE), helps users select the appropriate oil that guarantees protection and efficiency for their engine across a range of temperatures.

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Q how will you get wedge shaped thin film

ChristopherRob

IrisMiddleton Release Time: June 23, 2024, 3:08 PM

Wedge-shaped thin films can be formed through several methods, one of the most common being the deposition of material onto a substrate that is not perfectly flat or has a gradient in its thickness. Techniques like spin coating, where the substrate is rotated at high speeds, can create a centrifugal force that spreads the material, resulting in a thin film with a gradient thickness from the center to the edge. Another method is by using a mask during deposition that gradually changes in thickness or opacity, controlling the deposition rate or amount across the substrate. Precision in these methods is crucial for achieving the desired wedge angle and uniformity in the film properties.

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Q hdpe compatibility with sulfuric acid

GillBabbitt

IrisMiddleton Release Time: May 12, 2024, 4:23 AM

High-Density Polyethylene (HDPE) exhibits good chemical resistance to many substances, making it a preferred material for containers and piping in various industries. When it comes to sulfuric acid, HDPE’s compatibility is concentration-dependent. At low concentrations, HDPE can withstand sulfuric acid, owing to its strong chemical bonds and resistance properties. However, as the concentration of sulfuric acid surpasses 80%, HDPE’s resistance significantly decreases, leading to potential damage or failure of the material. This is due to the increased aggressiveness of the acid, which can attack the polymer chains of HDPE, causing structural compromise. Therefore, for applications involving sulfuric acid, it’s crucial to consider the concentration of the acid and the operational conditions such as temperature and pressure, which might affect HDPE’s performance. Choosing the right material for handling chemicals is vital for safety and efficiency in any process.

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Q is polypropylene a polyamide

EdenCrane

IrisMiddleton Release Time: May 9, 2024, 12:37 PM

Polypropylene is not a polyamide; it is a type of polymer known as a polyolefin, made from the polymerization of propylene gas. Polyamides, on the other hand, are a class of polymers made from the condensation of diamines and dicarboxylic acids, which includes materials like nylon. Polypropylene is renowned for its resistance to chemical solvents, bases, and acids, as well as its toughness and fatigue resistance. Polyamides are known for their strength, elasticity, and resistance to wear and tear, making them a popular choice in the textile and automotive industries. While both polypropylene and polyamides are valuable in various applications for their unique properties, their chemical structures and production processes differ significantly.

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Q how long to dry nylon before injection molding

PerryJerry

IrisMiddleton Release Time: May 7, 2024, 9:33 AM

Drying nylon before injection molding is a critical step to prevent moisture-related defects in molded parts, such as voids or surface imperfections. Typically, nylon should be dried for 6-12 hours at a temperature of about 80°C (176°F) in a desiccant dryer. The exact time can depend on the type of nylon, with some grades requiring longer drying times. It’s essential to monitor the moisture content, aiming for less than 0.2% moisture before processing. Overdrying should be avoided as it can lead to material degradation. Consulting the material supplier’s recommendations is also advisable to ensure optimal processing conditions.

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Q polypropylene suture properties

HaleyWright

IrisMiddleton Release Time: May 4, 2024, 1:27 PM

Polypropylene sutures are synthetic, non-absorbable materials widely used in medical procedures for wound closure due to their inert properties. They have minimal tissue reaction, ensuring a lower risk of infection or irritation at the suture site. These sutures are particularly valued for their excellent tensile strength, which remains constant over time, providing reliable support during the critical wound healing period. Additionally, polypropylene sutures exhibit minimal water absorption, which helps maintain their strength and handling properties in bodily fluids. Their slippery surface also makes them easier to handle and pass through tissues with less friction, reducing tissue trauma. Due to these characteristics, polypropylene sutures are often chosen for cardiovascular, ophthalmic, and neurological surgeries where long-term wound support and minimal interaction with tissues are crucial. However, since they are non-absorbable, removal might be necessary in some cases, depending...

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Q buy metal powder injection molding supplier

NoraWalkley

IrisMiddleton Release Time: April 30, 2024, 11:19 AM

When buying from a metal powder injection molding (MIPM) supplier, it’s crucial to consider their track record, the quality of the metal powders they use, their ability to meet your specific material requirements, and their capability to support your production volumes. MIPM is a complex process that combines the versatility of plastic injection molding with the strength and integrity of metal materials, making it perfect for creating small, intricate parts with tight tolerances. Look for suppliers with a strong emphasis on quality control and who offer comprehensive support, from the initial design phase through to production. Additionally, assess their technological capabilities and whether they can accommodate the specific alloys or composite materials you need. Reading reviews and asking for references can also provide insights into their reliability and the overall satisfaction of their clients. Lastly, compare pricing but remember that cost-effectiveness should not compromi...

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Q viscose v polyester

ChapmanPater

IrisMiddleton Release Time: April 19, 2024, 12:02 PM

Viscose and polyester, though both used widely in the textile industry, have distinct origins and characteristics. Viscose, derived from natural cellulose from wood pulp, is known for its silk-like feel, breathability, and ability to dye well, making it popular for clothing and linens. However, its production can be environmentally intensive, though sustainable practices are increasing. Polyester, a synthetic polymer made from petroleum products, is highly durable, resistant to shrinking and wrinkling, and quick-drying. It’s often used in activewear, insulation, and as a blend with other fibers to add strength. Yet, its synthetic nature means it’s less breathable than viscose and can be less comfortable in warm weather. The choice between viscose and polyester depends on the intended use, desired comfort level, and environmental considerations.

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