DFB lasers with ultrashort cavities or integrated passive waveguide reflectors are frequently proposed to realize directly modulated (DMLs) for carrying ultrahigh data rate signals. The former suffers from poor heatsink and laser cleavage yield, while the single-mode stability of latter scheme is seldom addressed. mode selection device performance a well known be very sensitive facet reflection...

The depletion of non-renewable energy sources and negative effects towards the environment push research widespread adoption renewable such as solar energy. main drawback panels is that temperatures above 27°C will result in an efficiency drop 0.1-0.5%/°C. In previous studies, usage photovoltaic thermal (PVT) systems was mainly for purpose heating water, warming buildings, drying crops. This fo...

The integrated body sensor networks are expected to dominate the future of healthcare, making a critical paradigm shift that will support people in comfort and security their own homes. Thermoelectric generators, this regard, can play crucial role as they steadily generate electricity from heat enable self-powered wearable or implantable medical, health, sports devices. This work provides compr...

We present a method to produce fast frequency swept laser emission from monolithic mid-infrared laser. A commercially available Fabry–Pérot cavity quantum cascade (QCL) operating at wavelength of 8.15 ?m was electrically driven by current pulse with 10 ?s duration and slow front rising time ?2 ?s. Due the switching lasing vertical diagonal transition in QCL strong quantum-confined Stark effect ...

This study explores the principle of producing cold through heat absorption at a temperature lower than ambient temperature, which requires use an endothermic mechanism. Specifically, focuses on evaluating multiple thermoelectric coolers using aluminum water exchangers as means validating proposed correlation series experiments. The system utilizes coolant and cooler coupled with heatsink to co...

Ultrablack materials have attracted wide attention due to their high light absorbance and efficient photothermal conversion used in the field of solar steam generation alleviate drinking water crisis. Herein, ultrablack low‐cost poly(vinyl alcohol)‐graphite composite xerogels (PGCXs) that vertically arranged pores thermal conductivities are fabricated. The PGCX‐50% shows (95.44%), good wettabil...

The thermal conditions of a filament LED retro light bulb has been investigated. In such bulbs, LEDs are mounted on filaments which have glass or sapphire substrate and surrounded by yttrium-aluminium-garnet (YAG). Heat management is challenging as heatsink cannot normally be used. Instead, heat removal enabled using helium the filling gas. As this provides less efficient than attached directly...

Trombe walls are a passive solar technology that can contribute to the reduction of building heating loads. However, during warmer weather conditions, may cause overheating. In this work, we investigate feasibility using perform multiple functions warm conditions including (1) and storing water for applications, (2) providing occupants with visibility outdoors, (3) generating electric power. Ex...