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Security devices. Schemes, articles, descriptions

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Security devices

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Perspective heating: wood briquettes



Section Alternative energy sources. Owners of country cottages are faced with the problem of organizing the heating of their own home. It is far from always possible to connect a country house to municipal heating networks. Therefore, today, already at the design stage, it is necessary to provide for all possible solutions for individual heat supply of a country house ... >>

Beat metal detector



Section Metal detectors. The proposed metal detector is designed for short-range search for objects. It is assembled according to the simplest scheme. The device is compact and easy to manufacture. An oscillatory circuit is connected to the measuring generator, which includes a sensor - an inductor. The output signals of both generators are fed to the inputs of a synchronous detector, which generates a difference frequency signal at its output. This signal has an approximately sawtooth shape. For the convenience of further processing, the synchronous detector signal is converted using a Schmidt trigger into a rectangular signal. The indication device is designed to generate a sound signal of a difference frequency using a piezo emitter and to visually display the value of this frequency using an LED indicator. ... >>

Automatic protection of network radio equipment



Section Clocks, timers, relays, load switches. The device is designed to prevent overload and malfunctions in radio equipment due to the deviation of the mains supply voltage beyond the tolerance. It will be especially useful in the country or in the countryside, where significant voltage fluctuations in the network are not uncommon. Often used in unstable networks, ferromagnetic stabilizers have a narrow stabilization range and, with significant voltage fluctuations (in the direction of increase), they simply fail. For some radio equipment, not only high, but also low mains voltage is dangerous. To control the network with a measuring device, each time before turning on the radio devices, is inconvenient and inefficient, since a deviation can occur during operation. But this task can be taken over by an automatic control device, through which the equipment is powered. ... >>

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Articles on security devices

Security devices and object signaling

Articles on security devices and signaling of objects; schemes of security devices and signaling facilities; descriptions of security devices and signaling facilities: 154 articles

 


 

Car security and alarm

Articles on the protection and signaling of the car; car alarm schemes; descriptions of car alarms: 63 articles

 


 

Automobile. Security devices and signaling (collection of schemes)

Articles on automobile security devices, car alarms; diagrams of automobile security devices, car alarms; descriptions of car security devices, car alarms: 23 articles

 


 

Security and alarm via mobile communication

Articles on security and signaling through mobile communications; diagrams of GSM security and signaling devices; descriptions of GSM security and signaling devices: 10 articles

 


 

Security and alarm system via mobile communication (collection of schemes)

Articles on security and signaling through mobile communications; diagrams of GSM security and signaling devices; descriptions of GSM security and signaling devices: 3 articles

 


 

Security and safety. Audio and video surveillance

Articles on audio and video surveillance; audio and video surveillance schemes; descriptions of audio and video surveillance: 15 articles

 


 

Security and safety. Personal safety

Articles on personal security; schemes of devices for personal safety; descriptions of devices for personal safety: 7 articles

 


 

Latest news of science and technology, new electronics:

Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

High Energy Density Capacitor 17.05.2024

Energy plays a key role in many aspects of modern life, and the ever-increasing demand for efficient and fast-charging power sources is driving innovation. Researchers at the McKelvey School of Engineering at Washington University in St. Louis have taken a significant step forward with a high-energy-density capacitor that promises to revolutionize the world of energy. A team of scientists from the McKelvey School of Engineering at Washington University in St. Louis presented the results of their latest research on heterogeneous thin-film structures for capacitors. Researchers, working with ferroelectrics, inadvertently created a capacitor with an amazing energy density that is 19 times higher than that of conventional elements. This breakthrough opens up new prospects for the development of fast-charging batteries, which are so necessary in the modern world. Capacitors play a key role in various devices, providing stable ... >>

Causes of conflicts between brothers and sisters 16.05.2024

Family relationships are often complex and multi-layered, and conflicts between siblings are no exception. Research in this area can help us understand what factors underlie these conflicts and why they occur so frequently. Let's look at some of the findings from psychologists at Arizona State University. American psychologists from Arizona State University conducted a study aimed at identifying the causes of conflicts between brothers and sisters. They found that different forms of violence, whether physical or verbal, did not depend on the gender of the siblings. This means that both girls and boys can exhibit aggressive behavior towards their loved ones. Other studies have shown that conflict between siblings often persists into adulthood, even as contact decreases. This indicates that people often follow established patterns of behavior formed in childhood. It was also found that, despite ... >>

Random news from the Archive

Protecting spin qubits from external noise 30.10.2018

Researchers from Germany have comprehensively investigated the shielding of electrical and magnetic noise to conduct efficient quantum computing using spin qubits.

Professor Guido Burkard and his team of physicists from the University of Constance have developed a theoretical concept for quantum information processing. They found a way to shield electrical and magnetic noise for a short time. This will make it possible to use spins as memory on quantum computers: their coherence time will increase, and during this period it is possible to perform many thousands of computer operations.

The technological vision for the development of a quantum computer depends not only on computer science and information technology. The new understanding of theoretical physics also affects the progress of practical implementation. Every computer or communication device contains information embedded in physical systems.

In the context of quantum computer development, spin qubits and their magnetic properties are at the center of attention. To use spins as memory in quantum technologies, you need to line them up, otherwise they cannot be controlled in the necessary way.

Physicists run into this problem when working with electric fields, where multiple electrons - four in this case - form a quantum bit. Another difficulty stems from the fact that scientists are dealing with electron spins, which, in turn, are very sensitive and fragile. Even in silicon solids, they respond to external influences from electrical or magnetic noise. This research focuses on theoretical models and calculating how quantum bits can be shielded from this noise - an important addition to the mainstream research for a quantum computer. If you isolate noise even for a short period, you can still perform thousands of computer operations in those fractions of a second - at least in theory.

Next, physicists from Konstanz will start experimental work with their colleagues to test the theory. For the first time, these tests will involve four electrons, rather than three, which could potentially be used by the Princeton partners. While the physicists in Constanta provide the theoretical background, their colleagues in the US are doing the experimental part of the work.

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