Mixing, homogeneity

At the other extreme, solid solutions are difficult to prepare. To form a solid solution, individual atoms or molecules must mix homogeneously within the solid network. Given that the atoms or molecules in a solid cannot move freely about, such mixing is difficult to achieve. Even if we grind two solids to fine powders and then mix them thoroughly, the resulting mixture will not be a solution, because the mixture will remain heterogeneous at the... 

For mixed homogeneous/heterogeneous primary nucleation, the following empirical expression can be used to describe its rate Kirk-Othmer Encyclopedia of Technology, 1978-1984) ... 

The utilization of a hydrolysis catalyst is advantageous for capturing urea droplets, improved thermohydrolysis of urea and mixing/homogenization of the flow, but it is not a pre-requisite for a working system. 

To achieve the goal of required performance, durability, and cost of plate materials, one approach is improvement of the control of the composition and microstructure of materials, particularly the composite, in the material designing and manufacturing process. For example, in the direction of development of thermoplastics-based composite plate, CEA (Le Ripault Center) and Atofina (Total Group) have jointly worked on an irmovative "microcomposite" material [33]. The small powders of the graphite platelet filler and the PVDF matrix were mixed homogeneously by the dispersion method. The filler and matrix had a certain ratio at the microlevel in the powder according to the optimized properties requirements. The microcomposite powders were thermocompressed into the composite plate. 

SpinPro determines which option is most appropriate. A number of parameters are affected by this option, including the run time. Knowing where to load the sample is important. Samples can be loaded at the top, middle, or bottom of gradients, or mixed homogeneously with them. 

If two low-molecular-weight liquids are united they will either mix homogeneously or separate into two phases. Which of the two cases occurs depends on whether the free energy AG increases or decreases during the mixing process ... 

Based on these results, it becomes necessary to install guide vanes to prevent flue gas flow stagnation at the corner as well as erosion of the far wall. The goal of this work is to deliver a well-mixed homogeneous flue gas stream to the inlet of the SCR catalyst. Angular entry of the flue gas into the SCR catalyst is avoided to protect the catalyst from erosion. 

Proteins from tissue homogenates are precipitated by tungstic acid. Mix homogenates, which contain about 1% protein, with 1/10 of volume of 10% sodium tungstate (Na2W04 H2O) (w/v), and acidify with the same volume of 0.67 N sulfuric acid. Collect the precipitate after 10 min at RT by centrifugation. Nucleic acids are precipitated by tungstic acid to a minor extent. 

Suspend budesonide in step 1 while mixing. Homogenize for 10 minutes. 

Dissolve item 11 in 15.0 g of item 16 (25° to 30°C) in a stainless steel container while stirring by stirrer. Add to mixer while mixing. Add items 13 and 12 into mixer while mixing. Homogenize high speed, and vacuum 0.4 to 0.6 bar. Mix and homogenize for 10 minutes. Dissolve item 14 in 7.0 g of item 16 in a stainless steel container. Add slowly into the mixer while mixing. 

Finely divided sodium dichromate (dihydrate or anhydrous) is mixed homogeneously with sulfur. This mixture is then reacted in a furnace lined with refractory bricks at 750-900 °C. An excess of sulfur is used to ensure completion of the reaction. The reaction mass is leached with water to remove water-soluble components such as sodium sulfate. The solid residue is then separated, dried, and ground. 

In other words, 1 MBq of tritium contains about 3 ng of tritium. Thus, an important feature of radionuclides becomes apparent—we routinely work with extremely small quantities of material. Pure samples of radioisotopes are called carrier free. Unless a radionuclide is in a carrier-free state, it is mixed homogeneously with the stable nuclides of the same element. It is, therefore, desirable to have a simple expression to show the relative abundances of the radioisotope and the stable isotopes. This specification is readily accomplished by using the concept of specific activity, which refers to the amount of radioactivity per given mass or other similar units of the total sample. The SI unit of specific activity is Bq/kg. Specific activity can also be expressed in terms of the disintegration rate (Bq or dpm), or... 

The Buss mixers are of two types the PRD mixer serves for pre-mixing, homogenization and cold crushing of materials and the DKG machines are provided with a shaft and a granulating screw in an air-granulation cascade arrangement (Table 4) 27). 

In several recent studies an assumption is made concerning the homogeneous-heterogeneous mechanisms of oxidation reactions as a reason for critical effects, in particular in the oxidation of cyclohexane over zeolites [131] and of CO over Pd [132-134] and V [135] catalysts. Berman and Elinek [131] have established in their experiments that cyclohexane oxidation over zeolites follows a mixed homogeneous-heterogeneous mechanism. Studies of the mathematical reaction model written down in accordance with the law of mass action showed that the system can have from one to three steady states. When the steady state is unique, there exists a region of parameters... 

Egermann H, Kemptner I, Pichler E. 1985. Effects of interparticulate interactions on mixing homogeneity. Drug. Dev. Ind. Pharm. 11 663-676. 

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