A method to produce a panel unit, including providing a core having a first surface and a second surface opposite the first surface, applying a surface layer to the first surface of the core, the surface layer including a wood veneer layer and a first binder layer for adhering the wood veneer layer to the first surface of the core, applying a balancing layer to a second surface of the core, the balancing layer including an unimpregnated paper and a second binder layer for adhering the unimpregnated paper to the second surface of the core, applying pressure to the surface layer, the balancing layer, and the core to form a panel unit. The disclosure also relates to a panel.

Square symmetric composite laminate structures, and sub-modules thereof, are provided, along with methods of forming the same. The square symmetric laminate structures include two or more sub-laminate modules, each comprising: a first ply set consisting of a first ply layer oriented at a first angle and a second ply layer oriented at a second angle, a first sum of the first and second angles being ninety degrees; and a second ply set consisting of a third ply layer oriented at a third angle and a fourth ply layer oriented at a fourth angle, a second sum of the third and fourth angles being ninety degrees; wherein the second ply layer is positioned adjacent the third ply layer and the second and third ply layers are both positioned intermediate the first and fourth ply layers, thereby defining a double-double helix arrangement of the respective ply layers. Associated methods are also provided.

Square symmetric composite laminate structures, and sub-modules thereof, are provided, along with methods of forming the same. The square symmetric laminate structures include two or more sub-laminate modules, each comprising: a first ply set consisting of a first ply layer oriented at a first angle and a second ply layer oriented at a second angle, a first sum of the first and second angles being ninety degrees; and a second ply set consisting of a third ply layer oriented at a third angle and a fourth ply layer oriented at a fourth angle, a second sum of the third and fourth angles being ninety degrees; wherein the second ply layer is positioned adjacent the third ply layer and the second and third ply layers are both positioned intermediate the first and fourth ply layers, thereby defining a double-double helix arrangement of the respective ply layers. Associated methods are also provided.

Improved containment mats and systems of containment mats may include multiple adjoining mats with a top surface and a bottom surface. The multiple mats may provide a modular structural mat system that may be installed at a drill site, with multiple mats placed adjacent to each other with a lap joint connecting adjacent mats. A geotextile may be used to cover the lap joints and a coating applied to the geotextile. Such a system may provide containment of potential spills, a reliable working surface for drilling operations, and relatively fast and less expensive installation.

Provided is a light absorption anisotropic film capable of preparing an image display device having excellent display performance and excellent durability, and a laminate and an image display device formed of the light absorption anisotropic film. The light absorption anisotropic film is used for an image display device, which is formed of a liquid crystal composition containing a liquid crystal compound and a dichroic substance, in which in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1) 2.0≤Imax/Isur1.

This specification presents sheets including graphitic materials, including sandwich structures, thermoformed or wet-formed single layer or multilayer structures of graphitic materials, and methods of forming a layer of graphitic material. In accordance with one aspect, the specification presents a multi-layer structure comprising a core layer having a core density between 0.01 and 1 g/cm.sup.3; and a skin layer covering the core layer, the skin layer having at least 10% by weight of a graphitic material, the graphitic material having one or more of graphene oxide, reduced graphene oxide, graphene, graphite oxide, reduced graphite oxide and graphite, the skin layer having a skin density of between 0.5 and 2 g/cm.sup.3 , a thickness ratio of the skin layer to the core layer being of between 1:1000 and 1:1.

Proposed is a composite material with a helical structure and, more particularly, a composite material with a helical structure that has a vibration absorption property. The composite material includes a laminated structure formed by stacking a plurality of sheet layers on top of each other. The structural structure has a helical structure in which two adjacent sheet layers are slid with respect thereto with a predetermined angle being made therebetween in a stacking direction, and the predetermined angle α is less than 45°

Proposed is a composite material with a helical structure and, more particularly, a composite material with a helical structure that has a vibration absorption property. The composite material includes a laminated structure formed by stacking a plurality of sheet layers on top of each other. The structural structure has a helical structure in which two adjacent sheet layers are slid with respect thereto with a predetermined angle being made therebetween in a stacking direction, and the predetermined angle α is less than 45°

A stiffness control and systems for the same are disclosed herein. A first plate and a second plate can be connected with rigid support, a hydraulic actuator and a high roughness surface. Upon actuation, the actuator can force the high roughness surface against the first plate, thus increasing rigidity through hydraulic pressure against the first plate and the second plate. Thus, the stiffness of the surface can be altered in a variable and reversible fashion.

A stiffness control and systems for the same are disclosed herein. A first plate and a second plate can be connected with rigid support, a hydraulic actuator and a high roughness surface. Upon actuation, the actuator can force the high roughness surface against the first plate, thus increasing rigidity through hydraulic pressure against the first plate and the second plate. Thus, the stiffness of the surface can be altered in a variable and reversible fashion.