摘要:
A no flow fluxing underfill having a hardener component comprising a phenolic component and an anhydride component in a molar ratio of phenolic component to anhydride component of between about 0.1:1 and about 2:1; or between about 0.8:1 and about 1.2:1. An underfill preparation method involving blending an epoxy component and a phenolic component, heating the blend, and cooling the blend, prior to incorporation of an anhydride component.
摘要:
The invention is directed to a fluxing curative for curing an underfill that comprises an epoxy resin and for fluxing a solder during a solder assembly of an electronic component to an electronic device substrate and a method for producing the fluxing curative. Specifically, the fluxing curative comprises a salt that is a reaction product of an imidazole component and a carboxylic acid component having at least 10 carbon atoms per molecule. Additionally, the invention is directed to an underfill solution comprising the fluxing curative and a method of attaching an integrated circuit device using the underfill solution.
摘要:
An anchor apparatus, ground anchor system, and method of using a ground anchor system are provided. The anchor apparatus includes a base plate having a top surface and a substantially planar bottom surface, wherein the base plate has a plurality of picket-guide apertures formed therein between the top surface and the substantially planar bottom surface. At least one picket is removably positioned in at least a portion of the picket-guide apertures. An anchor portion is formed at a first end of the base plate, wherein the anchor portion has an anchor aperture formed through the first end of the base plate, the anchor portion further comprising a ground face surface proximate to the anchor aperture, wherein a distance between the top surface and the ground face surface is less than a distance between the top surface and the substantially planar bottom surface.
摘要:
A system and method for wireless communication. The system can include a transmitter that transmits a data signal having a time period without data transmission. The system can also include a receiver including a first antenna, a second antenna, a switch that activates one of the first antenna and the second antenna, and a processor that estimates a first signal-to-noise ratio for the first antenna and a second signal-to-noise ratio for the second antenna during the time period without data transmission. The processor can control the switch to select one of the first antenna and the second antenna based on a comparison between the first signal-to-noise ratio and the second signal-to-noise ratio.
摘要:
A composition for use with a lead free solder is provided. In certain examples, the composition comprises an effective amount of a phenol to suppress void formation. Underfill compositions and devices that include the composition are also disclosed.
摘要:
Embodiments provide for ray tracing traversal that relies on selected geometrical properties of the application to reduce the number of operations required during each traversal step. The traversal algorithm does not depend on the number of rays in the group. As a result, multi-level traversal schemes may be implemented, starting with a large number of rays in a group and then reducing it as needed to maintain group coherency. Multi-level traversal schemes may be created by splitting large groups of rays while traversing acceleration structures.
摘要:
A golf club that is used to practice a golf swing. Specifically, the golf club includes a handle and a head coupled to the handle. The head is formed from a first portion and a second portion that are coupled together. The first portion may be formed of a rigid material and the second portion may be formed of a resilient material. The second portion may comprise bristles or some other soft, pliable, compressible material that will not damage a surface upon contact during swinging the golf club. The golf club head preferably has the same shape as a traditional golf club head of the same type. However, the second portion forms the sole of the head, thereby eliminating the potential for damage to a floor surface during swinging of the golf club.
摘要:
A conductive composition includes a mono-acid hybrid that includes an unprotected, single reactive group. The mono-acid hybrid may include substantially non-reactive groups elsewhere such that the mono-acid hybrid is functional as a chain terminator. Methods and devices using the compositions are also disclosed.
摘要:
A system and method for wireless communication. The system can include a transmitter that transmits a data signal having a time period without data transmission. The system can also include a receiver including a first antenna, a second antenna, a switch that activates one of the first antenna and the second antenna, and a processor that estimates a first signal-to-noise ratio for the first antenna and a second signal-to-noise ratio for the second antenna during the time period without data transmission. The processor can control the switch to select one of the first antenna and the second antenna based on a comparison between the first signal-to-noise ratio and the second signal-to-noise ratio.
摘要:
In a process for producing filler-containing thermoplastic molding compositions by mixing fillers with thermoplastics in the melt,a) the fillers are mixed in a mixing apparatus in the melt with a low molecular weight thermoplastic having a melt viscosity of at most 30 Pas (measured at 20.degree. C. above the melting point of the thermoplastic compound and at a shear gradient of 1,000 s.sup.-1),b) the product thus obtained is removed from the mixing apparatus, cooled and comminuted, andc) the comminuted product is then subjected in the solid phase to a post-condensation.