An investigation was performed to study the damage mechanism and mechanics of flat cylindrical laminated composite beams subjected transverse con centrated loading. The major focus fundamentally understand inter action between matrix cracking delamination propagation in structures resulting from loadings. analytical model developed which consists a stress analysis for calculating stresses strains composites, contact handling interface condition cracked surfaces during loading, failure anal...

We have demonstrated stable self-starting passive mode-locking in a diode-end-pumped Nd:YVO4 laser using semiconductor saturable absorber mirror (SESAM). An In0.25Ga0.75As single quantum-well SESAM, which was grown by the metalorganic chemical-vapor deposition technique at low temperature, acts as device and an output coupler same time. Continuous-wave mode-locked transform-limited pulses were obtained 1064 nm with pulse duration of 2.1 ps average power 1.28 W repetition rate 96.5 MHz.

The Blumlein pulse forming network (PFN) has widely been used in pulsed power technology to generate square waves with short widths. In this paper, we developed a repetitive frequency wave generator based on PFN and pseudospark switch (PSS). A unequal capacitances proposed, the parameters have optimized for better output waveforms. single-gap PSS withstand voltage of 40 kV 100 Hz designed PFN. experiment results show that can pulses 26 kV, rise time 25 ns, width 90 ns matched load 11 Ω. It...

Aspheric micro-lens array (AMLA), featured with low dispersion and diffraction-limited imaging quality, plays an important role in advanced optical imaging. Ideally, the fabrication of commercially applicable AMLAs should feature cost, high precision, large area speed. However, these criteria have been achieved only partially conventional process. Herein, we demonstrate characterization based on 12-bit direct laser writing lithography, which exhibits a speed, area, perfect lens shape control...

While the conventional remote method invocation mechanism has been considered for a long time as primary approach facilitating interactions among real-time objects, multicast support recognized in recent years an attractive supplement, if not favored approach, many applications. One highly promising concrete formulation of and associated programming model is memory-replication channel (RMMC). This paper presents API set designed easy use RMMCs middleware subsystem devised to RMMCs. An...

We built a mid-infrared time-domain spectroscopy (TDS) system optimized for the 8–12 μm spectral range based on compact ultrafast Erbium:fiber laser that enables measurements of phase-resolved optical field transients directly in time domain with high stability and brightness. achieved long term (>10 h) TDS signal by using carrier-envelope-phase locking technique to reduce timing jitter caused environmental changes. Time beam were via electro-optic sampling GaSe crystal, an ultrashort...

An improved coaxial high-voltage vacuum insulator applied in a Tesla-type generator, model TPG700, has been designed and tested for high-power microwave (HPM) generation. The design improvements include: changing the connection type of to conductors from insertion tangential, making thickness uniform, using Nylon as insulation material. Transient field simulation shows that electric (E-field) distribution within is much more uniform average E-field on two surfaces decreased by approximately...

The Tesla-type pulsed power generator based on transformer oil is limited by volume and weight, which affects its suitability for mobile platforms. In this paper, a double-width pulse forming line (PFL) high-energy-density liquid medium Midel 7131 was designed, compact, high-repetitive developed. structural electrical parameters of the PFL with an outer diameter 1000 mm were optimized to achieve highest output fixed load impedance 60 Ω. This employed line, has width four times length...

Abstract To produce pulses with good flat-top quality, pulse-forming lines (PFLs) have been widely used in the field of Tesla-type pulse generators. shorten physical length PFL, a double-width PFL (DWPFL) is proposed that doubles output width while maintaining quality. A repetitively 10 GW long-pulse generator producing about 110 ns was developed coaxial DWPFL to high-current electron beams. Electron beams widths were obtained on planar vacuum diode load. With this and C-band high-power...

It is essential to develop pattern-related process windows on substrate surface for reducing the dislocation density of wide bandgap semiconductor film growth. For extremely high instantaneous intensity and excellent photon absorption rate, femtosecond lasers are currently being increasingly adopted. However, mechanism laser developing remains be further revealed. In this paper, a model established based Fokker–Planck equation two-temperature (TTM) simulate ablation sapphire under action...

A 10-GW high-energy-density Tesla-type pulse generator is developed with an improved insulating liquid based on a modified Tesla pulser—TPG700, of which the forming line (PFL) filled novel oil instead transformer oil. Properties determining stored energy density PFL are analyzed, and criterion for appropriate proposed. Midel 7131 chosen as application example. The results property experiment under tens-of-microsecond charging demonstrate that insulation capability better than KI45X test in...

Comparative measurements with high-pressure spark gaps (gas pressure: 0.2–0.9 MPa nitrogen, gap spacing 5 mm) are presented, one a regular Bruce-profile polished graphite cathode (diameter 25 mm, thickness 8 and the other microarray of equal dimensions. By microstructuring, V-type is created by purpose-developed laser treatment plane electrode. The brings more initial plasma then produces electrons. It beneficial for electron emission, which improves stability switch breakdown. experimental...

To study the ablation mechanism of titanium (Ti) film under ultrafast laser, irradiation process Ti various pulse widths, energy densities, and wavelengths is analyzed by molecular dynamics combined with a two-temperature model (MD-TTM). The temperature distribution laser solved based on TTM phenomenon explored through MD simulation. It found that density wavelength have more significant impact than width. shorter wavelength, smaller penetration depth, obvious phenomenon. higher result in...

This paper presents a demonstration of an all-optical multicasting scheme for ultra high definition media over wavelength-routed networks, using Self-Phase Modulation. The feasibility this technique has been experimentally and theoretically evaluated streaming rates up to 100Gbps.

Ultrawide bandgap semiconductor $\beta$-Ga2O3 holds extensive potential for applications in high-radiation environments. One of the primary challenges its practical application is unveiling mechanisms surface irradiation damage under extreme conditions. In this study, we investigate orientation-dependent radiation on four experimentally relevant facets, namely, (100), (010), (001), and (-201), at various temperatures. We employ a multiscale atomic simulation approach, combining...

Graphene has attracted great interest for its distinctive band structure and physical properties. Results from previous studies show that a graphene cathode can provide stable field emission intense in vacuum. In this paper, was fabricated using chemical vapor deposition (CVD) on copper electrodes, the breakdown of high-pressure gas studied. A low-jitter, self-breakdown spark switch based is proposed paper. The impulse-breakdown characteristics quasi-uniform electric were When gap length 5...

Femtosecond Mid-IR pulses are coupled into a pulsed biased, room temperature QCL. Gain recovery due to depletion by pump-pulses is observed using time-delayed probe-pulses investigate the carrier dynamics of

We experimentally demonstrate ultrafast all-optical modulation in periodic arrays of subwavelength gallium arsenide nanodisks with localized Mie-type resonances. The efficient laser pulse up to 90% on the picosecond scale vicinity magnetic dipole resonance at a low pump fluence below 400 µJ/cm2 is shown by transient reflectance spectroscopy.

Previous studies have shown that it is feasible to retrieve multiple cloud properties simultaneously based on the space-borne hyperspectral observation in oxygen A-band, such as optical depth, cloud-top height, and geometrical thickness. However, remote sensing time-consuming if precise radiative transfer solution counts scatterings of light. To speed up radiation scenarios for nadir observations, we developed a physical parameterization reflectance A-band single-layer water clouds. The...

For the characteristics of wave-piercing catamaran longitudinal motion when sailing with high speed in random waves, this paper proposes a state estimation algorithm for based on EKF.On one hand noise is filtered out from pollution measurement signal as much possible, and desired separated therefrom; other hand, all information system can be obtained by simply selecting pitch angle heave displacement catamaran.Theoretical analysis simulation results show that proposed achieve satisfactory...