A high security two-way virtual cross-barrier observation and communication device has a mounting frame with a hardened core, a pair of digital displays, and a pair of cameras. The mounting frame may correspond to a typical interior door of a building or a relevant component of a vehicle, aircraft, or other relevant application. The hardened core is bullet-resistant and fire-resistant to protect occupants of a protected space from harm. The digital displays and cameras are positioned on opposing sides of the mounting frame, each camera transmitting a live video feed to the opposing display, creating the appearance of a window while protecting occupants. The digital displays may be used to display any desired information. An emergency protocol may be activated to communicate with emergency services. A plurality of laminate layers bond and encapsulate the displays and cameras to the hardened core, forming a rugged, self-contained unit with no moving parts.

A ballistic panel is described including a core layer having a first major surface and a second major surface, the core layer including a ballistic resistant material. A first layer comprising a ballistic gel material is disposed on the first major surface of the core layer. A second layer comprising a ballistic gel material is disposed on the second major surface of the core layer.

An impact attenuation system comprises an aluminum honeycomb sheet having a top surface and a bottom surface. The aluminum honeycomb sheet defines a plurality of approximately hexagonally shaped cells. The bottom surface defines a single sheet of contiguous cells and the top surface defines two or more islands of contiguous cells separated by one or more slits. At least a portion of one or both of the top surface and bottom surface may be covered by a polymer skin. The polymer skin may comprise carbon fibers and/or fiberglass.

A modular armor system configured to be readily attached and detached from a frame surrounding a window in a vehicle or other structure, such as a building. The modular armor system may be configured to provide any desired ballistics protection rating. In one embodiment, the modular armor system includes a ballistics-grade armor panel having an outer strike face and an inner surface opposite the outer strike face. The modular armor system also includes a fastener coupled to the ballistics-grade armor panel. The fastener is configured to detachably couple the ballistics-grade armor panel to the frame surrounding the window in the vehicle or other structure.

A multi-layer body armor plate includes a strike plate; a mesh layer positioned over the strike plate, the mesh layer having a number of open cells; and an outer skin layer positioned over the mesh layer so as to encapsulate the open cells of the mesh layer between the strike plate and the outer skin layer. The open cells of the mesh layer may entrap air or may be filled with expandable, buoyant foam.

An armor assembly has a metal strike face with a front and a back. A textile is coupled to the front of the metal strike face, and a backer is coupled to the back of the metal strike face. A front cover is coupled to the textile, and a back cover is coupled to the backer. In addition, the metal strike face can allow a Level III or a Level IV projectile to penetrate the metal strike face and be stopped by the backer.

A bulletproof protective structure (40) is described, composed of a flexible base constituted of a ballistic fabric (42) and of rigid elements (41) of ballistic material adhering to the fabric, wherein the adhesion surface of the rigid elements to the fabric is curved, so as to allow greater flexibility of the structure compared to similar known structures.

An impact absorption structure (1) is provided. The impact absorption structure (1) comprises an impact receiving component (3), capable of, after receiving an initial impact shockwave, separating that shockwave into at least a first shockwave (S11) and a second shockwave (S122), time-spaced from the first shockwave (S11). The impact absorption structure (1) also comprises an energy dissipation component (5) adjacent to the impact receiving component (3), such that the time-spaced shockwaves (S11, S122) can be passed across an interface from the impact receiving component (3) to the energy dissipation component (5). The energy dissipation component (5) comprises a chemical element or compound such as calcite exhibiting a first displacive phase change from a first phase to a second phase (52) upon experiencing the first shockwave (S11), a second displacive phase from the second phase (52) to a third phase (53) upon experiencing the second, later shockwave (S122), and a third displacive phase change from the third, or a later, phase (53) to the first phase upon unloading after the second shockwave (S122), the compound thereby exhibiting a hysteresis cycle in which elastic energy is dissipated.

Disclosed are a core-shell structure type wave absorbing material and a preparation method therefor. The wave absorbing material has a core-shell structure with two-dimensional transition metal-chalcogen compound nanosheets as cores and hollow carbon spheres as shells. The preparation method includes: dissolving the hollow carbon spheres in a solvent, sequentially adding a transition metal source and a chalcogen source, taking a solvothermal reaction after dissolution through stirring, and then performing posttreatment to obtain the wave absorbing material. The present invention further discloses an application of the wave absorbing material in fields of military and civilian high-frequency electromagnetic compatibility and protection. The core-shell structure type wave absorbing material of the present invention has a density of 0.3 to 1.5 g/cm.sup.3, a maximum reflection loss value and an effective bandwidth of the material can be effectively improved in a frequency range of 2 to 40 GHz, and the core-shell structure type wave absorbing material is an electromagnetic compatibility and protection material capable of meeting requirements of civilian high-frequency electronic devices and military weapons and equipment such as airships and artillery shells.

A multi-layer body armor plate includes a strike plate; a mesh layer positioned over the strike plate, the mesh layer having a number of open cells; and an outer skin layer positioned over the mesh layer so as to encapsulate the open cells of the mesh layer between the strike plate and the outer skin layer. The open cells of the mesh layer may entrap air or may be filled with expandable, buoyant foam.