The causes of tungsten points’ ablation of car distributor can be read as follows:

5. The bracket screw or tungsten points’ riveting of the distributor is loose. If tungsten points’ riveting of the distributor is loose, then the engine will break. When the engine operates at high speeds, the exhaust pipes of the engine will shoot. And the gap tungsten contacts will change intensely, sometimes small and sometimes large, which can result in low-voltage current that can not be cut off at some point, and ultimately leading to tungsten points’ ablation.

6. The surface of tungsten points offset or skew. If the surface of tungsten points offset or skew, then the resistance will increase. The primary current will decrease and high speed off the fire will occur when the generator working at high speed. Flashover distance will be shortened when test fire. The spark will flows through the points when the engine is operating, which will make the current centered, therefore, the temperature of the current flowing through the point will rise, bring about the result that tungsten points will ablate eventually. 


 

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The reasons of tungsten contacts ablation of car distributor shown as follows:

5. The riveting of tungsten contacts of the distributor is loose or the bracket screw is loose. If the riveting of tungsten contacts of the distributor is loose, then the engine will fracture. And the engine’s exhaust pipes will shoot when the engine running at high speeds. The gap change of tungsten contacts is intense when the engine running at high speeds, sometimes large and sometimes small, which can cause low-voltage current that can not be cut off at some point, leading tungsten contact ablation eventually.

6. Tungsten contacts’ surface offset or skew. If the tungsten contacts’ surface offset or skew, then, it will lead to the increase of resistance. When the generator running at high speed, the primary current will reduce, high speed off the fire will occur. When test fire, flashover distance will be shortened. When the engine is working, it is the points that spark through, it will make the current focused, so that the temperature of the current through the point will rise, eventually leading to tungsten contact ablation.


 

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The causes of tungsten points’ ablation of car distributor can be seen as follows:

3. Car engine working at a low speed during a long period. In case the car engine working at a low speed during a long period, the closure time of tungsten points will prolonged resulting from the decreased frequency of opening and closing, and lead to the increase of  self-induced electromotive force of the primary winding and the primary current, eventually tungsten points will ablate. To avoid these phenomenons, you should increase the tungsten points’ gap of distributor appropriately.

4. Bad capacitor work

Bad internal connection or bad connection between housing and ground will lead to bad capacitor work.
Checking way: using the way of disassembling capacitor to in contrast of high voltage electrical spark.

When you disconnect the power-off tungsten points, capacitor will absorb the surge voltage which is formed by the self-induced electromotive force of primary winding of the ignition coil to reduce spark discharge of tungsten points, and to avoid tungsten points being ablated, furthermore, improving the rate change of primary current, therefore, improving the high-pressure spark.


 

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The reasons of tungsten contacts ablation of car distributor:

1. Tungsten contacts gap is too small. If tungsten contacts gap is too small, it will make the closing time of tungsten contacts extended, resulting in the disconnection of the primary winding and the increase of self-induced electromotive force, eventually the tungsten contacts will ablate due to the spark erosion of tungsten contacts intensified.

2. Battery wire connection is bad. If the battery wire connection is bad, then because the car in moving process will bump and vibrate, which would make the battery wire connection sometimes turned sometimes interrupted, causing the generator will occur briefly overvoltage phenomenon, so that the primary winding of the ignition system of self-induced electromotive force exceed and the primary current increase, leading to the formation of strong spark discharge between tungsten contacts, resulting in tungsten contact ablation.


 

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The spin-lattice relaxation of the S-state ion Gd3+ in a calcium tungstate host lattice has been examined at 37.5 GHz over the temperature range 1.5 to 30 K. The gadolinium concentrations in the doped single crystals used were about 50 ppm. Single exponential recovery was observed and the spin-lattice relaxation time (T 1) varied from about 14 msec at 1.5 K to 0.03 msec at 30 K, measured with θ=90° and φ=8°. It was found that T 1 varied with temperature (T) as T 1 ∝ T −1 below 8 K and as T 1 ∝ T −3 between 8 and 30 K. The experimental data was fitted by the expressions T 1 −1 =35 T+0.5 T 3 and T 1 −1 =35T+0.1 T 3.6 for crystals of nominal gadolinium concentrations 0.005 wt % and 0.05 wt % respectively. The difference between the observed dependence and the T −5 variation predicted in the Raman region for an S-state ion in a perfect lattice is attributed to defects. Measurements in the φ-plane at 4.2 K showed that T 1 was anisotropic with a maximum value atφ=25° about three times greater than the minimum value obtained at φ=55°. The angular positions at which these features occur show a remarkable coincidence with the “acoustic axes of symmetry” of the crystal, which have recently been determined by ultrasonic methods.


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CaWO₄ nanocrystals with average diameters of 20-30 nm and nanorods with mean lengths of 600-1000 nm were controllably synthesized through a facile microemulsion-mediated hydrothermal procedure. And the factors affecting the morphologies of the products, such as the molar ratio ( w) between water and CTAB, the reaction temperature and the concentration of the reactants, were studied and discussed. With the increase of the w value, the diameter of the as-synthesized products increased gradually, except in the case of w=10 where nanorods were formed. With the temperature increasing, the morphologies of the products changed from nanocrystals to nanorods, and finally to nanocrystals again. However, the concentration of the reactants exhibited no obvious influence on the shape and size of the CaWO₄ product. A possible mechanism is proposed for the selective formation of the different morphologies. The photoluminescent properties of the CaWO₄ nanocrystals are also reported. All the products of CaWO₄ with different morphologies exhibited the only green peak at 435 nm with an excitation wavelength at 238 nm.


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Calcium tungstate suspension was prepared with natrium tungstate and calcium nitrate as the starting materials and polyglycol 200 as the surfactant, and then calcium tungstate nanocrystals were obtained after heat-treatment at 100℃.X-ray diffraction analysis, infrared scattering spectroscopy analysis and transm ission electron microscopy observation indicate that the nicely crystallized calcium tungstate nanocrystals are well dispersed with no aggregation. PEG 200 plays an important role in the dispersal of CaWO4 nanocrystals. When being excited at 265nm, the photolum inescent spectrum of calcium tungstate exhibits the luminous peak in blue band.


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Tungsten panoramic collimator is constructed with two tungsten alloy shields designed to provide a 30 degree panoramic radiation beam. The tungsten alloy shields are encased with stainless steel and totally sealed by argon arc welding.Tungsten panoramic collimator can be easily attached to the guide tube exposure head of radiography camera with a thumb screw.

• When an exposure is taken with the collimator attached to the exposure head of the gamma camera guide tube, the radiation beam will have a 30 degree solid angle all around for panoramic exposures.
• The primary radiation beam intensity in other areas will be reduced to 5% with the collimator.
• At a source to film distance (SFD) of 50 cm, the beam will cover a width of a 27 cm.
• Overall size : 44 mm dia x 82 mm long.
• Weight : 1kg.

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Tungsten polymer, such as nylons, urethanes and thermoplastic elastomers. Tungsten loadings range from 65% to 80% by weight to meet radiopacity requirements.

The advantages of tungsten polymer for radiation shielding:
High density: specific gravity≥11.34 g/cm3, provides an alternative material for solving the problem of lead in non-hazardous radiation shielding applications.
Good flexibility: with rubbery feel and good flex fatigue resistance, overturn the conventional touch of tungsten metal and tungsten alloys.
Excellent workability: soft and smooth, easy to work with and cut, high freedom in shape.
Perfect environmental suitability:non-toxic, no pollution to soil, water and air.

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Polymer tungsten is made of tungsten powder and polymer. As an ideal good lead substitute material, the polymer tungsten exhibit many excellent properties or special characteristics such as high density(≥11.34 g/cm3), perfect radiation shielding performance, good flexibility, excellent workability and perfect environmental suitability. This non-hazardous, versatile product comes in a variety of shapes for use in many hard-to-shield applications. It’s a ideal protective material for radiation shielding of equipment and staff in nuclear, X-ray diffract meter. Substitute material of lead in bullet, balancing member, vibration-damping material. Weight member of high-grade golf clubs, hook and toy, etc..

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