Multiwall thermal protection system

Multiwall insulating sandwich panels are provided for thermal protection of hypervelocity vehicles and other enclosures. In one embodiment, the multiwall panels are formed of alternate layers of dimpled and flat metal (titanium alloy) foil sheets and beaded scarfed edge seals to provide enclosure thermal protection up to 1000 F. An additional embodiment employs an intermediate fibrous insulation for the sandwich panel to provide thermal protection up to 2000 F. A third embodiment employs a silicide coated columbium waffle as the outer panel skin and fibrous layered intermediate protection for thermal environment protection up to 2500 F. The use of multiple panels on an enclosure facilitate repair and refurbishment of the thermal protection system due to the simple support provided by the tab and clip attachment for the panels

Multi-cell battery protection system

A multi-cell battery protection system is described wherein each cell has its own individual protective circuit. The protective circuits consist of a solid state comparator unit and a high current switching device such as a relay. The comparator units each continuously monitor the associated cell and when the cell voltage either exceeds a predetermined high level or falls below a predetermined low level, the relay is actuated whereby a bypass circuit is completed across the cell thereby effectively removing the cell from the series of cells

Fire Protection System Analysis at Building and Environment in Inderalaya Campus of Sriwijaya University 2013

Background : Safety of the occupants inside the building and its environment should be a major consideration especially of the fire hazard. To protect from the fire hazards, the technical requirements of the fire protection system should be met. Method : Design used in this study is a descriptive study with a qualitative approach. In the selection of informants using the snowball sampling technique, informants in this study amounted to seven people and for the selection of the building using purposive sampling. Result : The water is taken from retention ponds and Water Treatment Proces. There is already an exit but still do not have the sign yet. Testing of fire resistant building structure had not been done. Fire extinguisher only found in the rektorat buildings and chemical laboratories, hydrant and siemense conection only found in rusunawa buildings, alarms and fire detector only provided in clinics whereas there is no sprinkler at all. There is no written policy for the fire prevention and suppression. There is not a fire team. Checks on the fire protection system has not been done regularly. Conclusion : In fulfillment of the requirements of the fire protection system there are still many who have not met, it is necessary to include the fulfillment of fire extinguisher, hydrants, alarms, detectors, sprinklers and be checked periodically as soon as re-establishment of the fire team

Overload protection system for power inverter

An overload protection system for a power inverter utilized a first circuit for monitoring current to the load from the power inverter to detect an overload and a control circuit to shut off the power inverter, when an overload condition was detected. At the same time, a monitoring current inverter was turned on to deliver current to the load at a very low power level. A second circuit monitored current to the load, from the monitoring current inverter, to hold the power inverter off through the control circuit, until the overload condition was cleared so that the control circuit may be deactivated in order for the power inverter to be restored after the monitoring current inverter is turned off completely

Topological crystalline protection in a photonic system

Topological crystalline insulators are a class of materials with a bulk energy gap and edge or surface modes, which are protected by crystalline symmetry, at their boundaries. They have been realized in electronic systems: in particular, in SnTe. In this work, we propose a mechanism to realize photonic boundary states topologically protected by crystalline symmetry. We map this one-dimensional system to a two-dimensional lattice model with opposite magnetic fields, as well as opposite Chern numbers in its even and odd mirror parity subspaces, thus corresponding to a topological mirror insulator. Furthermore, we test how sensitive and robust edge modes depend on their mirror parity by performing time dependent evolution simulation of edge modes in a photonic setting with realistic experimental parameters.Comment: 10 pages, 7 figure

Orbiter thermal protection system

The major material and design challenges associated with the orbiter thermal protection system (TPS), the various TPS materials that are used, the different design approaches associated with each of the materials, and the performance during the flight test program are described. The first five flights of the Orbiter Columbia and the initial flight of the Orbiter Challenger provided the data necessary to verify the TPS thermal performance, structural integrity, and reusability. The flight performance characteristics of each TPS material are discussed, based on postflight inspections and postflight interpretation of the flight instrumentation data. Flights to date indicate that the thermal and structural design requirements for the orbiter TPS are met and that the overall performance is outstanding

Optimization of force-limiting seismic devices connecting structural subsystems

This paper is focused on the optimum design of an original force-limiting floor anchorage system for the seismic protection of reinforced concrete (RC) dual wall-frame buildings. This protection strategy is based on the interposition of elasto-plastic links between two structural subsystems, namely the lateral force resisting system (LFRS) and the gravity load resisting system (GLRS). The most efficient configuration accounting for the optimal position and mechanical characteristics of the nonlinear devices is obtained numerically by means of a modified constrained differential evolution algorithm. A 12-storey prototype RC dual wall-frame building is considered to demonstrate the effectiveness of the seismic protection strategy

Phase protection system for ac power lines

The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter for energizing the relay circuit, and a bistable four terminal transducer coupled between the phase detection circuit and the power relay circuit, for controlling both circuits

Analysis of existing effectiveness and method to enhance the lightning, shielding and earthing protection schemes applied on the Parit Raja’s Telecommunication Tower System

Lightning, one of nature’s most destructive forces, continues to wreck havoc on lives and property especially in today’s electronic environment. It has been shown by field experiences that telecommunication towers are one of the preferential points for direct lightning strike. This is mainly connected with the specific features of their construction where the presence of high telecommunication towers and their topographical location mostly at an open area or at hills. The potential of lightning strike toward communication tower is high. A telecommunication tower located at Parit Raja town was chosen as a case study. The location of the tower is good to channel the coverage toward the community. Unfortunately this tower is very vulnerable to lightning strike and can giving impact to the surrounding buildings located nearby the tower itself such as mosque, petrol pump, post office and the Bank Simpanan National (BSN) bank. This thesis presents work that look at the current protection scheme against the lightning strike and the effect on a telecommunication tower system and the surrounding. Analysis study had been made towards existing protection component or system and their effectiveness in mitigating the lightning strike impact on the Parit Raja tower system. The investigation of the lightning protection system used by the communication tower is sufficient enough to direct the overload voltages of a lightning strike. Also, the analysis on the existing grounding earthing system is able to accommodate and dissipate the surge current to the earth. The method such as rolling sphere and cone protection had been used to identify the safety area on the site due to direct strike. Some suggestions to enhance the tower system protection such as installation external ground bus bar, radial system, and new installation for connection of coaxial cable and underground cable. Overall from this project, the weaknesses of system protection were identified in the tower Parit Raja and the proposal as improvement for the protection scheme in the future

Parents in the child protection system

This report documents the experiences of 47 parents who have been involved with Tasmania’s Child Protection Service. It also covers the experiences of over 140 frontline workers employed by 40 different non-government services (NGOs) that have provided support to these parents. In addition, the research involved speaking with 16 child protection staff from across the state and five lawyers involved in child protection work. The aim of the research was not only to chart what happens to parents within the Child Protection Service but also to collate their views and those of NGOs about how to improve the design and delivery of services. A key focus of the report was working in partnership. The report explores the challenges involved for parents, for NGOs and for child protection workers to work together in partnership to best support children