For the demand for long-range and high-resolution target reconstruction of slow-moving small underwater targets, research on single-photon lidar technology is being carried out. This paper reports sequential multimodal adaptive algorithm based spatiotemporal sequence fusion, which has strong information extraction noise filtering ability can reconstruct depth reflective intensity from complex echo photon time counts spatial pixel relationships. The method consists three steps: data...

This letter describes the integration of microstrip slot array antenna with amorphous silicon solar cells. To appraise antenna, a 2×2 circularly polarized integrated cells using stacked design method was measured. The results show that gain is almost unchanged after and axial ratio decreases to 1.4 dB. are perfectly combined, interference between minimal. saves lot space, has ability self-sustaining power generation, thus providing reliable long-term communication for various satellite systems.

Aiming at the demand for long-range and high-resolution imaging detection of small targets such as submerged submarine markers in shallow coastal waters, research on single-photon lidar technology is carried out. This paper reports sequential two-mode fusion algorithm, which has a strong information extraction capability can reconstruct scene target depth reflection intensity images from complex signal photon counts. The algorithm consists four steps: data preprocessing, extremely large...

Mobile device losses and thefts are skyrocketing. The sensitive data hosted on a lost/stolen fully exposed to the adversary. Although password-based authentication mechanisms available mobile devices, many users reportedly do not use them, may be while in unlocked mode. This paper presents design evaluation of iLock, secure usable defense against theft device. iLock automatically, quickly, accurately recognizes user's physical separation from his/her by detecting analyzing changes wireless...

We present high-reflectivity mechanical resonators fabricated from AlGaAs heterostructures for use in free-space optical cavities operating the telecom wavelength regime. The are slabs of GaAs and patterned with a photonic crystal to increase their out-of-plane reflectivity. Characterization modes reveals residual tensile stress device layer. This results higher frequencies than unstressed can be used strain engineering dissipation. Simultaneously, we find that finite waist incident beam...

In this paper, a new method of measuring water-stimulated Brillouin scattering (SBS) frequency shift by optical coherent detection is presented, in order to remote-sense the underwater temperature ocean. A single longitudinal mode, passively Q-switched pulsed Nd:YAG laser used as light source, water SBS beam signal beam, and portion incident local oscillator. The heterodyne detected high-speed photodetector, shift. Therefore, can be determined according relationship between temperature. To...

In-plane uniformity of narrow-gap semiconductor $\mathrm{In}\mathrm{As}$/$\mathrm{Ga}\mathrm{Sb}$ type-II superlattice (T2SL) wafer is a crucial yet hard-to-evaluate prerequisite for high-performance long-wavelength infrared optoelectronic device applications of, e.g., focal-plane-array (FPA) photodetectors. In this work, we report modulated photoluminescence-mapping (PL-mapping) study T2SL in range with spatial resolution typical FPA-pixel scale. Spatial distributions are analyzed PL-peak...

In this letter, we develope a control and image processing system for Streak Tube Imaging Lidar (STIL).In the system, data acquisition card software interface are programmed in Visual Basic (VB) while is finished by MATLAB.A STIL imaging experiment carried out laboratory.We obtained intensity range images of targets with pseudo color reconstruction set raw streak at different distances acquired STIL.The resolution better than 2 centimeters.

In this paper, we, for the first time, apply angle diversity transmitters (ADTs) to enhance performance of multiple-input multiple-output visible light communication (MIMO-VLC) systems. The ADT is designed consist one center emitting diode (LED) and multiple inclined side LEDs. We calculate line-of-sight (LOS) channel gain MIMO-VLC system using ADTs further derive average achievable rate system. show that related both inclination LEDs spacing between two adjacent in Simulations are conducted...

Wireless home alarm systems are being widely deployed, but their security has not been well studied. Existing attacks on wireless exploit the vulnerabilities of networking protocols while neglecting problems arising from physical component IoT devices. In this paper, we present new event-eliminating and event-spoofing commercial by interfering with reed switch in almost all COTS sensors. both attacks, external adversary uses his own magnet to control state order either eliminate legitimate...

A new method for laser-frequency stabilization by controlling the pulse setup time is presented.The frequency-stabilization system monitors continuously, and controls it adjusting cavity length.Laser frequency stabilized to center of gain curve when shortest.The used stabilize a radio-frequency-excited waveguide CO2 laser tuned grating, shift estimated be less than ±25 MHz an extended period.The has advantages compact structure, small volume, low cost.It can applied other kinds pulsed lasers...

We present electrically injected GaAs/GaAsBi single quantum well laser diodes (LDs) emitting at a record long wavelength of 1141 nm room temperature grown by molecular beam epitaxy. The LDs have excellent device performances with internal efficiency 86%, loss 10 cm-1 and transparency current density 196 A/cm2. can operate under continuous-wave mode up to 273 K. characteristic are extracted be 125 K in the range 77∼150 K, reduced 90 150∼273 coefficient 0.3 nm/K is 77∼273

A high frame rate streak tube imaging lidar (STIL) for real-time 3D of underwater targets is presented in this paper. The system uses 532nm pulse laser as the light source, maximum repetition 120Hz, and width 8ns. LabVIEW platform used system, control, synchronous image acquisition, data processing display are realized through PC. experiment target carried out a flume with attenuation coefficient 0.2, images different depth material obtained, 100Hz, detection 31m. For an distance 22m,...

We propose and demonstrate a GaN-based series-driven hybrid light emitting diode (SH-LED) device in which broad-area micro-LED components are interconnected for simultaneous illumination high-speed visible communication (VLC) applications. Through theoretical analysis based on an equivalent electrical circuit model characterization from fabricated exemplar with blue emission, it is shown that SH-LEDs combine the advantages of by offering high direct-current (DC) optical power output fast...

An electro-optical Q-switched RF-excited Z-fold CO(2) waveguide laser was designed, which can output a and cavity-dumped synchronously. The build-up time method is presented to stabilize the frequency. A closed-loop control system designed keep oscillating at peak of gain curve by measuring pulse continuously controlling cavity length. In experiment, variations for power with were recorded in period time. frequency fluctuation less than ±16 MHz.

With the continual advancement of technologies such as microbial cultivation, DNA sequencing, bioinformatics, and genetic engineering, methods for breeding have become increasingly diverse. We identified a RecJ enzyme (BaRecJ) with both endonuclease exonuclease activities from B. alcalophilus. Differing traditional physical-chemical mutagenesis approaches based on perturbation factor. this research established novel method utilizing BaRecJ. Mutagenesis E. coli was conducted using BaRecJ...

CORS-RTK network based on BeiDou navigation system enjoys a wide application in fields of infrastructure construction, but its applicability urban road reconstruction and expansion with complex conditions calls for further exploration. According to the precision analysis results drawn from number horizontal vertical comparison experiments real conditions, delivers better performance than other measurement methods terms precision, convenience, reliability under various conditions. The...