48 results about "Molar mass distribution" patented technology

Methods, systems and devices are described for rapid characterization and screening of liquid samples to determine properties (e.g., particle size, particle size distribution, molar mass and/or molar mass distribution) thereof with static light scattering and/or dynamic light scattering. The liquid samples can be solutions, emulsions, suspensions or dispersions. One method, includes providing a vessel containing a liquid sample having an exposed surface that defines a gas-liquid sample interface, and analyzing the sample by light scattering methods that include transmitting light through the gas-liquid sample interface into the sample, and detecting light scattered from the sample or from a component thereof. Additional methods are directed to characterizing a plurality of liquid samples or components thereof. The methods, systems, and devices have applications in high-throughput screening, and particularly, in combinatorial materials research and in industrial process control.

A laser ablation cell (1) comprises a flow channel (11) having an essentially constant cross-sectional area so as to ensure a strictly laminar flow in the flow channel. A sample chamber (21) is provided adjacent to a lateral opening (14) of the flow channel. A laser beam (41) enters the sample chamber (21) through a lateral window (16) and impinges on a surface (24) of a sample (23) to ablate material from the sample. The sample may be positioned in such a distance from the flow channel that the laser-generated aerosol mass distribution has its center within the flow channel. This leads to short aerosol washout times. The laser ablation cell is particularly well suited for aerosol generation in inductively coupled plasma mass spectrometry (ICPMS), including imaging applications.

A process and apparatus are provided to characterize low-resolution partial point clouds for object recognition or query. A partial point cloud representation of an object is received. Zero and first order geometric moments of the partial point cloud are computed. A location of a center of a point cloud mass is computed using the geometric moments. A cubic bounding box is generated centered at the location of the mass center of the point cloud, with one side of the box bounding the point cloud at its longest semi-axis. The bounding box is divided into a three dimensional grid. A normalized voxel mass distribution is generated over the three dimensional grid. Tchebichef moments of different orders are calculated with respect to the voxel mass distribution in the grid. Low-order moments are collected to form TMSDs. Similarity is compared between the TMSD of the point cloud with TMSDs of other point clouds.

The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.948 to 0.953 g/cm³ and an MFR_190/5 of the final product after extrusion in the range from 0.10 to 0.50 dg/min. The composition comprises from 30 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 22 to 40% by weight of a second ethylene polymer fraction made of a further homopolymer or first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce films having a good balance between processability and mechanical properties.

The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.940 to 0.948 g/cm³ and an MFR_190/5 of the final product after extrusion in the range from 0.10 to 0.50 dg/min. The composition comprises from 40 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 25 to 45% by weight of a second ethylene polymer fraction made of a first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce thin films having improved mechanical properties, in particular in terms of dart drop impact strength, at a high take-off speed without impairing the film bubble stability.

The invention provides a computation method for mass distribution of an aircraft, and belongs to the engineering field of aircraft weight. The computation method is characterized by comprising the steps of analysis of computation requirements, collection of original data, classified computation and summarization of the data. Data of mass distribution of the full aircraft can be obtained. The computation method has the advantages that digitization engineering application of computational analysis of mass distribution of the aircraft is achieved; the computational accuracy and the computational efficiency are greatly improved compared with a traditional method; the computation result does not rely on engineering application experience of engineers, and therefore influence of human factors on the computation data is reduced.

Method for producing polyacrylate adhesive compounds with a narrow molar mass distribution by radical polymerization and subsequent decolorization of colored reaction products resulting therefrom.

A system and method for measuring particle mass distributions as a function of particle diameter. The system includes a nebulizer, a particle size classifier and a particle detector. The system may include a dilution module. It may also include a particle mass classifier. The system and method are useful for distinguishing particle populations of similar size and different densities as well as determining the interaction between materials (binding) in mixed colloid systems with varying material ratios. The system and method are also useful for determining particle density in both homogeneous and heterogeneous colloids.

A novel scanning method of a mass spectrometer apparatus is introduced so as to relate by simple time shifts, rather than time dilations, the component signal (“peak”) from each ion even to an arbitrary reference signal produced by a desired homogeneous population of ions. Such a method and system, as introduced herein, is enabled in a novel fashion by scanning exponentially the RF and DC voltages on a quadrupole mass filter versus time while maintaining the RF and DC in constant proportion to each other. In such a novel mode of operation, ion intensity as a function of time is the convolution of a fixed peak shape response with the underlying (unknown) distribution of discrete mass-to-charge ratios (mass spectrum). As a result, the mass distribution can be reconstructed by deconvolution, producing a mass spectrum with enhanced sensitivity and mass resolving power.

Disclosed is a propeller manufacturing technique. Blades of a propeller are completed in a multi-layer manufacturing manner, the mass distribution of the propeller can be controlled better, product precision is improved, and the motion unbalance phenomenon caused by uneven weight gravity center distribution to the propeller is effectively reduced. The blades of the propeller are spliced in a foam perfusion manner after being completed, the technique is simple and effective, the requirements for the strength and mass distribution of the propeller can be met, and operation is easy and convenient.

An electrolyte membrane for solid polymer fuel cell includes a reinforce membrane made of nonwoven fibers and an electrolyte provided in a space among the nonwoven fibers. The nonwoven fibers have a non-uniform mass distribution in a plane of the electrolyte membrane. A mass of the nonwoven fibers per unit area in a region corresponding to at least part of a peripheral portion of a fuel cell-use gasket frame is greater than a mass of the nonwoven fibers per unit area in a region corresponding to a center portion of the gasket frame. The electrolyte membrane for solid polymer fuel cell is attached to the fuel cell-use gasket frame.

The present invention relates to a metallocene catalyst based on a transition metal of group 4 or 5 of the periodic table, supported on a hybrid catalytic support provided with aliphatic organic groups.

One also describes a process for supporting metallocene on said hybrid catalytic support of aliphatic organic groups.

The supported metallocene catalyst of the present invention exhibits, as its main advantage, the fact of producing an ethylene polymer with broad or bimodal molar mass distribution, by using only one type of metallocene complex on the support. As a result, on obtains, better processability of the resin obtained and, therefore, a potential reduction of the processing cost.

The present invention describes a metallocene catalyst based on a transition metal of group 4 or 5 of the periodic table, supported on a hybrid catalytic support provided with aliphatic organic groups, and a process for supporting metallocene on the hybrid catalytic support. The supported metallocene catalyst provides an ethylene polymer with broad or bimodal molecular weight distribution, in the presence of only one metallocene complex on the support.

The invention relates to a rubber mixture, in particular for treads of vehicle tires and to vehicle tires. The rubber mixture contains at least the following components: at least one diene rubber and 30 to 150 phr of at least one soot which has a DBP number of 130 to 200 ml/100 g according to ASTM D 2414, an iodine adsorption number of 40 to 75 g/kg according to ASTM D 1510, and a distribution index DI of 1.00 to 1.10. DI is calculated from the particle size distribution (mass distribution by the Stokes diameter) determined by means of DCP (disk centrifuge photosediometer) according to formula I): I) DI = DW/Dmode. The rubber mixture exhibits an improved rolling resistance behavior and an improved abrasion behavior. The vehicle tire contains the rubber mixture in at least one component, preferably in the tread.