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TECON successfully introduced four kinds of facade protection system into site applications, following different site situation and contractor's preference.
Three of them are Protection Screen (lifted by hydraulic cylinder), Self-Climbing Platform SCP(lifted by electrical hoist with chain block), Self-Climbing Platform SCP LITE(the aluminum version of SCP). All facade protection systems help the construction site make full closure at the slab edge and go up together with structure by itself without a tower crane lift. They cover height from 12 to 18m, with 1 to 5 layers work platform, thus are become more and more popular especially for high rise buildings.
Finally, the last system, the most economical handrail clamp can be erected on the edge of the concrete slab with timber or GI pipe prepared by the site.
What does facade do when constructing a building?
The facade is used to prevent the entry of water and pollutants. It should be designed to preserve protection and good optical appearance for as long as possible when constructing a building.
Why is it necessary to keep facade protected for the building?
Facades have two functions. They are the protective skin of buildings and at the same time give a beautiful appearance to them
Four Reasons To Choose Us
TECON also offers OEM fabrication service for any kind of accessory with drawing or sample from formwork and scaffolding company outside China.
Four Reasons To Choose Us
TECON also offers OEM fabrication service for any kind of accessory with drawing or sample from formwork and scaffolding company outside China.
RICH EXPERIENCE
Our management team have more than 10 years of experience in formwork industry, by participated in various kind of projects.
EXCELLENT QUALITY
As the leading formwork brand in China, our materials are proven to maintain reliable performance due to their excellent quality on every detailed aspect.
ON-SITE SUPERVISION
We provide on-site supervision according to client’s request, to teach the site team know-how on installation, operation and maintenance.
Road safety barriers suppliers is Shanjing ，which convenient and easy to carry, because it needn’t to use a crane like a cement pier, which can saving manpower and cost. Shanjing road safety barriers can be used on most roads without causing roadside injuries. Most important is that Shanjing road barriers can be installed without any road construction. And the product supports stacking items to reduce use area. It is worth mentioning that the flexibility of the Shanjing safety road barriers. You can follow any road curve bending adjustment. Shanjing road safety barriers have clear color. You can choose different colors according to the road requirements. Shanjing road barriers can be used in series for better overall endurance，so our motorway barriers for sale will very suitable to your needs.
The Function Of Road Barriers
Road Barrier is also known as rubber road barriers Shanjing road barriers adopts imported PE material and road barrier systems , which is more resilient after adding water. Rubber road barriers supplied by Shanjing(china rubber belt supplier) can absorb strong impact, thus effectively reducing the injury to vehicles.
Industrial synchronous belts drives consists of an endless belt whose inner surface has equally spaced teeth and of belt wheels which have the corresponding teeth and is a kind of new type belt drive which has synthesized all the good points of belt drive ,chain drive and gear drive, which working the teeth of the belt and the gullets of the gear joggle each other to transmit the motion and the dynamic force.
Industrial timing belts has such features as exact transmission ratio, on-sliding, constant velocity ratio which can be gained ,even motion, adsorption of vibration, little noises, the big range of transmission ratio which can normally reach 1:10, that the allowed linear velocity can reach 40m/s, that the transmission power can be from after W to hundreds of KW, nigh transmission efficiency which normally reach 0.98, compacting structure , the suitability to multiaxle transmission, no need of lubrication. no pollution and so on. there fore the product can normally work well in the places where no pollution is allowed and where the working condition is worse and textile. chemical engineering, light industry, mining , instruments, oil industry and so all kinds of other machinery drive.
Products provided by industrial timing belt manufacturers
Rubber Drive Belts
Industrial Timing Belt
Trapezoidal Tooth Timing Belt
Round Tooth Timing Belt
Steel pipe couplings, sockets serve to connect straight pipe to straight pipe often in low-pressure systems. They can be manufactured with many kinds of steel, such as carbon, galvanized, stainless, or black. As such, they can be found in a wide array of set-up for water, oil, gas, air, and more.
Many threaded pipes in use with these kinds of lines come with pipe couplings attached. These pipe couplings help to protect the threading on the pipe from exposure to the elements. When a couplings is not present on a threaded pipe, it must be welded after being threaded to the pipe. The steel used in pipe couplings is therefore specifically designed tube easier to weld than other couplings. Steel couplings are also absent of casting marks, steams, or bends, and so they have a smooth exterior.
At Sanvo Pipes & Fittings we pride ourselves on our superior quality and service. For customers with different manufacturing needs of steel pipe coupling/sockets, we provide carbon steel coupling, black pipe nipples, galvanized pipe nipples, stainless steel pipe nipples, seamless pipe nipples, brass pipe nipples, aluminum pipe nipples, carbon steel pipe sockets and stainless steel pipe couplings. Our pipe nipples and couplings are available in the following size: 1/8 ", 1/4 ", 3/8 ", 1/2 ", 3/4 ", 1 ", 1-1/4", 1-1/2 ", 2 ", 2-1/2 ", 3 ", 4 ", 5", 6 ". All of our steel pipe coupling/sockets are strictly produced by the the standards of DIN, BS, ISO, ANSI, API, and JIS, etc., with excellent quality and thoughtful service. Sanvo is your reliable supplier and trustworthy business partner in China.
If you have any questions about pipe nipples and couplings, we provide a variety of contact information so that you can easily contact us. Please email info@pipenipples.com, or call +86 0317 2021378, or use our simple online quotation form. Our professional team of steel pipe coupling/sockets will contact you as soon as possible.
1.Overview of EV Water-Cooling On-board Charger Case
Vehicle charger is an essential core component of new energy vehicles, and its market scale expands with the rapid growth of the new energy vehicle market. Compared with traditional vehicles, new energy vehicles have three core components, namely: "battery" assembly means battery and battery management system; "Motor" assembly means the motor and the motor controller.
At present, the vehicle charger has the function of high-speed CAN network and BMS communication to judge whether the battery connection status is correct. Getting the battery system parameters, and the real-time data of the whole group and the single battery before charging and during charging.
By high speed CAN communication network and vehicle monitoring system, upload the working status, working parameters and fault warning information of the charger, and accept the control command to start charging or stop charging. For safety protection measures, it has functions such as ac input over-voltage protection, ac input under-voltage warning and ac input over-current protection.
2.Advantage of EV Water-Cooling On-board Charger Case
Aluminum alloy structural parts have good plasticity, aluminum alloy material special physical properties,so in the ductility and plasticity of the product is much better than the steel material. Aluminum alloy structure has advantages of light weight, small volume, low cost, but also has the waterproof, dustproof and anti-corrosion,the characteristics of aluminum alloy on the heat dissipation can be fast cooling, and the structure can make air cooling and water cooling model charger, effective cooling of high power charger, enable the internal electronic components to small power input, the effect of high power output.
3.Application of EV Water-Cooling On-board Charger Case
This paper will mainly talk about how to operate extruder machine. Each type of product in the plastic extrusion line has its operating characteristics. Only with a detailed understanding of its operating characteristics can the efficiency of the machine be given full play. Extruder is one of the types, grasp the key points of extruder operation, the correct and reasonable use of an extruder. The use of the screw extruder includes the installation, adjustment, commissioning, operation, maintenance and repair of the machine and a series of links, its use has the general characteristics of the machine, mainly in the drive motor and speed reducer. However, the working system of the screw extruder is the extruder system, and it has unique characteristics.
The installation, adjustment and test run of the machine are generally specified in the operating manual of the extruder. The operation points of the extruder, maintenance and maintenance are described as follows:
Operators must be familiar with the structural characteristics of the extruder they operate, especially to correctly grasp the screw structure characteristics, heating and cooling control instrument characteristics, nose characteristics and assembly, so as to correctly grasp the extrusion process conditions, correctly operate the machine.
When making different plastic products, the operating points of the extruder are different, but there are some similarities. The following is a brief introduction of the same procedure and the key points of the extruder.
Preparation before Starting
Used for extrusion molding of plastics. The raw materials shall meet the required drying requirements and shall be further dried if necessary. Sift the raw material to remove caked aggregates and mechanical impurities.
Check whether the water, electricity and gas systems in the equipment are normal, ensure that the water and gas paths are smooth and no leakage, whether the electrical system is normal, whether the heating system, temperature control and various instruments work reliably; Auxiliary engine empty car low-speed test run, observe whether the equipment operates normally; Start the vacuum pump of the shaping table and observe whether the work is normal. Lubricate the smooth parts of various equipment. If the fault is found, remove it in time.
Mounting head and shaping set.
According to the product variety, size, choose the machine head specifications. Install the nose in the following order.
The machine head and the flange bolts of the extruder should be tightened again before starting the machine head at a constant temperature to eliminate the difference between the bolts and the head's thermal expansion. The bolts of the tightening head should be tightened diagonally in order and the force should be uniform. When tightening the flange nut of the machine head, the requirement is consistent with the tightness around, otherwise, the material will be run.
The startup, select and press the "prepare to start up" button, then connect the "start-up" button, then slowly rotate the screw speed adjusting knob, the screw speed starts slowly. Then gradually speed up, while adding a small amount of material. When feeding should pay close attention to the host ammeter and various indicator head indicator changes. Screw torque cannot exceed the red label (generally 65-75% of the torque table). Before the plastic profile is extruded, any person shall not stand in front of the die, in order to prevent damage accidents caused by bolt breaking or wet release of raw materials. After the plastic is extruded from the die, the extruder is cooled slowly and the drawing device and the shaping die are put into operation. Then according to the indication value of the control instrument and the requirements of the extruded products. Adjust each part accordingly to make the whole extrusion operation reach the normal state. And according to the need to add enough material, double screw extruder adopts metering feeder feeding uniform speed.
When the die out evenly and good plastic can be used to shape the traction. The judgment of the degree of plasticization needs experience, generally can be judged according to the appearance of extruded materials, that is, the surface is shiny, no impurities, no foam, coke and discoloration, squeeze the extruder by hand to a certain degree of no burr, crack, a certain degree of elasticity, this means that the material plasticization is good. If the plasticization is not good, the screw speed, barrel and nose temperature can be adjusted until the requirements.
In the process of extrusion production, check whether various process parameters are normal regularly according to the process requirements, and fill in the process record sheet. Inspect the quality of profile products according to quality inspection standards, and take measures to solve problems.
Stop Feeding
Stop feeding and squeeze out the plastic in the extruder. When the screw is exposed, turn off the power supply of the barrel and the head and stop heating.
Turn off the power of the extruder and auxiliary machine, and stop the operation of the screw and auxiliary machine.
Open the connection flange of the machine head and remove the machine head. Clean up the perforated plate and various parts of the machine head. In order to prevent damage to the inner surface of the machine head, the residual materials in the machine head should be cleaned with steel law and steel sheet, and then the plastic adhering to the machine head should be removed with sandpaper, and polished, coated with oil or silicone oil to prevent rust.
Clean the screw rod and barrel. After removing the head, restart the main machine, add parking materials (or broken materials), and clean the screw rod and barrel. After the stop material is crushed into powder and completely extruded, compressed air can be used to repeatedly blow out residual particles and powder from the feeding port and exhaust port until there is no residual material in the barrel. Then, the screw speed should be reduced to zero, the extruder should be stopped, and the main power and cold water valve should be closed.
The safety items that the extruder should pay attention to during extrusion include: electricity, heat, mechanical rotation and the loading and unloading of heavy parts. The extruder must be equipped with lifting equipment, and the machine head, screw and other heavy parts should be installed and removed to ensure safe production.
As one of the most outstanding plastic extruder machine manufacturers in China, we can give you the best price and product, please feel free to contact us.
Overview of HKY / SKY Two Stage Extruder
HKY / SKY series two-stage extrusion system: the first stage is HK or SK series high speed and high torque co-rotating twin screw extruder, the second stage is single screw extruder to form a two-stage compound extrusion system. The system combines twin screw high speed, strong mixing with single screw low speed, low temperature and weak shearing characteristics to enhance advantages and avoid disadvantages. It is the preferred model for mixing and modifying heat-sensitive and shearing-sensitive materials efficiently nowadays. The main granulation methods are air-cooled hot cutting and eccentric water mist granulation. They can also be matched with drawing strip cold cutting and water ring hot cutting.
Applications of HKY / SKY Two Stage Extruder:
PVC Cable Material and XLPE Peroxide Crosslinking Material
Soft PVC Medical Material
Hard PVC Products
EVA Foamed Shoe Bottom Material
PE Low Smoke Halogen Free Resistance Fuel
Main Features of HKY / SKY Two Stage Extruder:
Plasticization, mixing and homogenization of twin screw processing section
Open melt feeding single screw extruder without backpressure, and exhaust and devolatilization can be carried out at the same time.
Soft extrusion of materials through the template of single screw extruder
Air-cooled granulation, eccentric water mist granulation, stretch granulation and water ring granulation can be selected according to material properties.
Smaller power and area
Fully automatic raw material mixing and granulation process to reduce labor costs
Easy to operate, excellent safety and stability
Overview of Interdental Brush
Direction for use:
1.Insert brushs gently into the space between teeth at gum level
2.Gently move the brush backwards and forwards to remove plaque and debris.
3.Never force the brush into a space. If the brush is too large, try the smaller size
Threaded pipe nipple refers to the pipe connection with thread, which is the most common pipe fitting in industry and life. The threaded joint makes the connection of the pipe easier, and the disassembly and replacement easier, which greatly saves the cost of the pipe connection.
Threaded nipple generally includes threaded elbow, threaded tee, threaded union, threaded pipe cap, threaded pipe hoop, threaded reducer, threaded plug, bushing, etc.
The industrial screw nipples are generally made of metal, with high pressure resistance. The materials are carbon steel, stainless steel, alloy steel, brass, etc.; the screw nipples used in life are generally made of PC, PVC, PE, PPR, etc.
Main features of pipe nipple threaded:
According to your needs, we provide different materials of steel pipe joints, good quality and good density, welcome to contact us and to buy.
Friction welding is a pressure welding method that uses the heat generated by the relative frictional movement of the weldment to achieve reliable connection of materials.
The friction stir welding and processing is under the effect of pressure, the friction between the materials to be welded increases the temperature of the interface and its vicinity and reaches in the thermoplastic state, with the action of upsetting force, the interface oxide film is broken, the material undergoes plastic deformation and flow, and the joint is formed by the interface element diffusion and recrystallization metallurgical reaction.
In actual production, continuous drive friction welding, phase-controlled friction welding, inertial friction welding and friction aluminium stir welding are more common.
Friction welding machine is mainly used for welding of medium-sized shaft parts. It can weld a wide range of metals, and has the characteristics of stable performance, high production efficiency and low energy consumption.
As one of the most professional friction welding companies, we provide with the best friction welding services, if you have any interests, please contact us.
Overview of SK53 Twin Screw Extruder
SK53 mini plastic extruder machine can be used in engineering plastics, color masterbatch, functional masterbatch, blending modification and other industries.
In order to adapt to the high temperature and high wear resistance of Engineering plastics, HIP hot isostatic pressing technology is used in the material selection of cylinder and screw for SK53 mini twin screw extruder. It has the advantages of high wear resistance and corrosion resistance; for example, when the customer's working formula in PA, PP + glass fiber or carbon fiber + flame retardant, it is recommended to use high wear resistance material (SAM10); if the customer's working material not only requires to wear resistance but also has certain acidity and alkalinity, it needs to consider using corrosion resistance material (SAM26/39). In view of the lateral forced feeding of carbon fibers, a special feeding screw design is adopted, which effectively solves the problem that the material is fluffy and can not be fed.
Hot isostatic pressing (HIP) is to place the product in a sealed container and apply the same pressure in all directions to the product. At the same time, SK53 twin screw extruder can be sintered and densified under the action of high temperature and high pressure. Thermo-isostatic pressure is an indispensable means and technology for the production of high performance materials and the development of new materials.
Overview of KY-Lab Twin Screw Extruder
Since its establishment in 1993, KY has been devoted to the development and manufacture of small lab scale twin screw extruder. On the 9th anniversary of the introduction of HK and SK series twin screw extruder, KY introduced two new KY-Lab Twin screw extruders, namely, the new high torque HK26 and the super high torque SK26, with a diameter of 26mm. This model is specially designed for universities, scientific research institutes, and R&D departments of enterprises. It fully meets the tasks of teaching, formulation R&D, proofing, and small-batch production.
KY-Lab Twin screw extruder has obvious advantages over other models.
The clearance between the screw and cylinder is smaller, which is convenient for discharging and cleaning.
Modular structure, interchangeable 4D/6D barrel, standard screw element design
Reliable synchronous amplification to HK and SK series products
Spline sleeve and nose are new quick-opening structure, clearing and screw replacement combination is more convenient.
The cooling pipes and wiring of the whole machine are all inside the base, which ensures the smoothness of the base surface and is easy to clean.
With the coaxial solenoid valve imported from Germany, the response time is reduced by 90% compared with the conventional solenoid valve, the cooling efficiency of the cylinder is higher, and the temperature control accuracy can be maintained at <1 Celsius.
Movable base. The whole machine is supported by four strong universal wheels. Only one person can easily use mobile devices.
Adopt KY independent intellectual property rights KY twin-screw extruder smart operation system software V5.0 as the whole machine control system, combine KY and Germany Germany in respective control technology superiority, guarantees the entire machine control intellectualization and the accuracy.
KY has professional laboratory extruder for sale, contact us now.
The application scope of KY-Lab Twin screw extruder:
Homogenization of Polymers
Combination of rubber and plastic (elastomer)
Matrix Production
Modification of Engineering Plastics
Modification of General Plastics
Cable Material
Filling and Mixing Modification
Flame Retardant and Reinforcement Modification
Degradable plastics
High-Temperature Polymers
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在21世纪，随着数据已经融入我们生活和工作的各方各面，数据科学专业也成为近几年最热门的新兴专业之一。
很多人虽然常常听别人提起大数据，但是却觉得它离我们很遥远，似乎只出现在高校的课堂或是跨国企业的会议室中。事实上，无论是在用淘宝浏览、购物，还是用支付宝付账还款时，我们都无形中为大数据分析提供了素材/信息。而当我们每天查询公交车和地铁线路，看看今天的空气污染程度时都是在享受大数据回馈给我们的便利。从就业形势和就业前景上看，伴随着科技飞速发展，数据的大量应用，学科的交叉性越来越强，数据科学专业的优势就显现了出来。其中最根本的原因就是它可以应用在各个领域，金融、政府、医疗都需要大量的精通数据科学的高素质人才。
学生：Q同学 （美高4年）
GPA：3.7+
TOEFL：无
SAT：1250，拼分后1300
申请专业：数据科学、应用数学、统计学
录取学校：UC Irvine （加州大学尔湾分校）University of Massachusetts, Amherst（马萨诸塞大学安姆斯特分校）等
Q同学刚刚与申请老师沟通的时候，对自己的本科申请不是很有信心，甚至想放弃自己的梦想专业–数据科学，申请一些要求较低的专业。申请老师在全面了解他的背景之后，对他的情况做出了专业的分析和判断。
虽然Q同学的综合GPA看起来并没有很强的竞争力，但是申请老师仔细研究Q同学的成绩单之后发现，Q同学的高中是一所教会学校，所以学校要求他修了几门宗教相关的课程，而这几门课才是拉低他的GPA的“元凶”。
对于数据科学这类指向性很强的专业来说，大部分的学校看GPA时，都会单独考量专业GPA，因为专业GPA更加能够体现学生是否具备学习这门专业的能力。对于Q同学来说，这无疑就是他的优势所在。
申请老师协助Q同学根据他的要求和综合实力，筛选出了6所最适合他申请的学校，并且和他一起进行头脑风暴，讨论适合写在文书中的数据分析相关经历。在申请老师的帮助下，Q同学在今年的录取季收获颇丰，成功拿到了UC Irvine （加州大学尔湾分校）University of Massachusetts, Amherst（马萨诸塞大学安姆斯特分校）等大学的录取通知书。Q同学非常感谢求真教育对他的鼓励和帮助，求真教育也祝他在之后的求学道路上一帆风顺。文章来源：https://indeededu.com
每当临近繁忙的 转学申请 季，选择并且决定专业就好像成为了学生们的一大难题。在申请过程中，不同的学校对专业课程要求是不同的。在 转学申请 过程中想临时更换专业一定要提前计划。在确定专业意向时，学生需要谨慎填写。今后的学习过程中，学生选对了专业，其实也是学生今后人生职业规划的重要一步。
H同学是一名就读于洛杉矶某社区大学的学生，在刚进入社区大学时，出于对统计学的喜爱，H同学以优异的成绩完成了前两个学期的统计课，并保持着3.8的GPA。但是在某次学校人类学讲座上，H同学开始渐渐地对人类学提起了兴趣。他有了放弃所有已修过的统计学课程的念头，想开始学习人类学。但是恰逢转学申请的截止日期也越来越近，H同学因为从小生活在加州，因此倾向于转去加州系统的大学。在H同学边认真学习大学课程时，他已提交了UC TAG的申请。但是H同学在提交了TAG申请后立马找到了求真教育，他告诉我们在TAG申请的专业填写中，他选择了统计学，而他之后的课程都只与人类学有关。UC申请时由于共用一个系统，并且H同学想冲刺UCLA和UCB，因此文书成了H同学的一大难题。
求真教育的文书老师姚老师立即和H同学进行头脑风暴，引导H同学在文书中展现个人特色，表达独立观点。为了丰富文书内容和个人经历，求真教育的老师提供了一些科研项目推荐H同学去参加。H同学积极参加各项研究，最后成功地收到了科研项目负责人的推荐信。
在求真老师的助力下，H同学终于拿到了UCLA的录取。在UCLA两年的学习期间，由于课业的紧张和难度，H同学又在求真进行了多次学术辅导，他也更加努力学习，最后顺利毕业于UCLA。
求真教育建议所有更换专业的同学一定要提早规划好学习课程，不能在紧急时刻才做出最后的决定。求学之路上难免会遇到各种棘手的问题，求真教育致力于给学生提供最全面的学习计划，让学生在申请过程中放心、安心。文章来源：https://indeededu.com
KY also offers a larger-scale HK twin screw extruder, with the commonly used screw diameters ranging from 110 mm to 165 mm (HK110-165) available for user selection. According to the material and process, the process components with a length-diameter ratio of 72:1 can be provided, and enough reaction residence time can be provided to achieve the best dispersion and mixing effect.
Large twin screw extruders are mainly used for polyolefin granulation, which is particularly common in petrochemical enterprises. The usual PE and PP granulation is the typical operation of this application. HK125 large extruder has a large market share in special extrusion, such as UHMWPE fiber and lithium battery diaphragm extrusion.
HK135 large twin screw extruder also has many successful applications in polymer devolatilization and reactive extrusion. Special extrusion and professional applications can contact KY for consultation. KY has many years of experience in the production and process of large-scale equipment, plus a good manufacturing system can provide users with more and larger production systems.
Nanjing KY is one of the companies with the largest spare parts storage in the whole industry, with more than 55000 varieties. With the first-class warehouse coding management system in the world, it can inquire about the real-time storage situation of spare parts in a very short time to deal with various emergencies of customers. KY provides various twin screw extruder parts.
KY has adopted the first-class brand constant temperature and humidity air conditioning device to ensure that twin screw extruder parts are not affected by temperature, humidity and other external environments in the storage process.
With its own technical accumulation, KY can also provide spare parts for more than 40 kinds of twin-screw extruders of 7 International brands, including mechanical and electrical spare parts such as screw components, cylinders and mandrels.
All extruder machine parts are guaranteed to be new, unused and properly preserved. They are made of imported materials, the best domestic materials and the first-class processing technology, and meet the quality, specifications and performance requireme
For all the people who have pets, they may have the following questions:
"how long can my baby stay with me? What if it's gone one day? "
Also, we are often asked by clients:
"Can my cat /dog be cloned after death?"
"Can their hair, bones and blood be cloned?"
Although we have explained it many times, we believe that there are still many pet owners who are not sure about the perfect time of sampling for animal pet cloning and whether their pets have the chance to be cloned successfully. This article will help you to sort out these problems, and I believe that you’ll have a better understanding and grasp the key moment of pet cloning.
The answer is yes. It is possible to clone pet cat or dog if living cells can be collected and cultured after death.
If the animal has died, if possible, wrap the body in a damp bath towel and put it in the fridge, not the freezer. In general, it is possible to collect living somatic cell within one week after the death of the dog and three days after the death of the cat. Be careful not to freeze them. In general, it is impossible to collect living pet cell after the body is frozen. Most of the tissue cells are composed of liquid. Ice crystals will be formed after freezing, and the genetic material will be destroyed. Therefore, the genetic material in the frozen cells will be ineffective and can no longer be used for animal cell cloning.
No. Only complete and active somatic cells can be used for pet cloning.
Hair, scurf, bone, nail, saliva, bloodstain and other materials are all possible to extract DNA from an organism. It is used for DNA testing or paternity test because the inactive cells can still retain complete DNA and can be obtained by scientific means. However, this does not mean that living cells can be extracted from those samples. The premise of gene cloning is to obtain complete and active somatic cells. Cells that have died due to metabolism can no longer grow, divide, and produce new cells.
Now we know when dead dogs and cats can be cloned and when they cannot. In order to avoid regret, in fact, the best way is to do cell preservation as early as possible. Save the cells of dogs and cats in advance when they are healthy, so as to have a chance to start again when something unexpected happens one day.
During this nation's and the world's crisis, invite God in and follow His direction, because His wisdom and understanding surpass all. (Proverbs 3:5-6).
Since the 1990s, there have been many new features in the development trend of epoxy resin curing agents in the world, mainly in the following aspects.
① New varieties emerge in an endless stream, the amines are still in the first place, followed by the anhydrides.
② The "semi inorganic polymer" curing agent containing P, Si, B, F, Mg and other elements has attracted people 's attention due to its unique properties.
③ The modified mercaptan system and the modified phenol system curing agent also have different degrees of development.
④ A large number of new block copolymers with thiol groups at the end are put on the market.
① The functional curing agent has become a hot spot of research and development.
(1) Multifunctional (with curing, toughening, flame-retardant, promoting and other functions) curing agent has become the ideal product that people pursue. Because the development of epoxy resin with new structure and excellent performance has not made much progress, the functional auxiliaries to meet the requirements of resin modification have become the goal of people's pursuit.
(2) Curing agents with fast curing, low temperature curing and minimum water absorption have developed rapidly.
(3) Curing agents with special functions have also made great progress, such as elastic curing agents.
② The curing agent is low toxic and non-toxic.
One of the characteristics of the development of modern curing agent is that people not only pay attention to the toxicity and environmental pollution of curing agent in the process of production and use, but also pay attention to the environmental pollution of waste epoxy resin products. In developed countries, the primary polyene, polyene and aromatic amines have all been replaced by non-toxic or low toxic modified amines.
③ Curing agents suitable for special environment (wet, underwater, outdoor, etc.) are popular.
④ In order to meet the high performance requirements of epoxy resin, curing agents with excellent electrical, mechanical and mechanical properties will be greatly developed.
⑤ More and more attention has been paid to electron beam and light curing agent.
⑥ The curing agent for powder coating, water-soluble solid ratio agent for water-based epoxy resin coating and one-component adhesive are widely used.
① The modification technology is widely used, such as the modification of aliphatic amine, the modification of epoxy resin (especially the modification of m-phenylenediamine and m-phenylenedimethylamine), the modification and liquation of acid, the modification and liquation of Dicyandiamide (the annual demand for liquid dicyandiamide in China is about 1000 tons), the modification and liquation of imidazole, and the modification of low molecular weight polyamine.
② The technology of compounding efficiency and containerization is in the ascendant. Restricted by toxicity, environmental regulations, cost, efficiency and other factors, the development of new structure curing agent is more and more difficult.
③ The technology of liquefying solid curing agent has a bright future. For example, anhydrides and dicyandiamide which are solid at room temperature can not only improve their operation and use performance, but also save energy.
④ Curing agent production operation and packaging refinement
