Evaluation of Probiotic-Fermented Feed Addition and LaserFiring to Accelerate Mature Broodstocks and Seed Productions of African Catfish (Clarias gariepinus)

This study aimed to determine the effects of fermented feed using probiotics and laser-firing to accelerate the mature broodstocks and seed productions of African catfish (Clarias gariepinus). Fish has used male and female broodstocks of catfish. The method was used a completely randomized design with three treatments: unfermented feed as control, probiotic-fermented feed (PFF), and probioticfermented feed+laser firing (PFF+Li). In the first study, a laser-firing dose of 1.125 Joule was performed on fish broodstocks every 15 days. The gonadal maturity time of male and female broodstocks was observed. The second study, treated female broodstocks, was mated with mature male broodstocks without any prior treatments (control). Fertilization rate, hatching rate, and seed production performances such as survival rate and total length were measured. The results showed that treatment of PFF+Li has a significant effect (P<0.05) on the gonadal maturity time of males and females. This treatment reaches the fastest time to mature of the female gonad (31-41 days) and the male gonad (32-37 days) than other treatments (P<0.05). This treatment also produced the highest fertilization, hatching, and survival rates of more than 90%, respectively, and the highest seed yield of 2.1-3.0 cm size compared to other treatments (P<0.05) in African catfish.

Using a CO2 Laser-Firing as a Clean Production Method to Form an Electrical Conductivity Surface and Color-Changing on Craft Ceramic.

Craft ceramic is an old industry. Most craft clay needs to be fired in a kiln, but kilns are expensive and inefficient [Kiln firing thermal efficiency: Kiln body heat storage 18.67%, Exhaust Sensible Heat 45.9%, Heat loss from incomplete combustion 16.24%, Radiated Conduction and Other Loss of Heat 12.61%]. In order to change the color of ceramic, potters commonly use kiln reduction firing. This technique requires an additional step and more fuel, which creates more air pollution. In this study, we used a CO2 laser to fire craft clay and glaze. This process not only changes the ceramic’s color but also changes the conductivity of the ceramic’s surface. By changing the composition of the glaze, the ceramic’s surface resistance was altered. Most kiln-fired ceramics are non-conductive because oxides are combined by covalent bonds. During the laser firing process, the covalent bonds become metal bonds. This new firing technique produces ceramic products that are superior in terms of light, heat, magnetism, and electricity. Thus, laser firing adds more function to the final ceramic product than kiln firing does. As opposed to kiln firing, there is no air pollution associated with CO2 laser firing. In comparison to kiln firing, laser-firing reduces both heat waste and air pollution by 99%. This study is based on our patented laser ceramic reduction firing technique. (Taiwan, R.O.C Patent Number: I687394) We recommend additional studies into laser firing in order to collect more data on laser-based ceramic production. Range: 20W laser

Drone Detection and Auto Destroy System

The purpose of this project is to design and construct automatic drone detection and destroying system using embedded systems. This system is designed to detect the target (drone) moving in multiple directions. The target destroying system moves automatically in the direction of drone and fires it upon fixing the target. In this project we are making use of infrared sensor based radar system and a dc motor driven laser firing unit interfaced with a microcontroller based control unit. Embedded C programming is used for Microcontroller.

FEASIBILITY STUDY OF MICRO-LATTICE STRUCTURES BY MULTIPHOTON LITHOGRAPHY

The paper describes the possibilities of additive manufacturing with multiphoton lithography. The basis of this technology is that a laser beam (with a certain wavelength) is fired into the mixture of a monomer and a photo-initiator. When the energy of the laser is high enough, the latter acts as a catalyser for the polymerization of the monomer compound. This study focuses on the influences of certain parameters of the multiphoton lithography process. One of the important aspects is the choice of the solvent for the post processing. In sequence to the solvent problem, the influence of the layer height is examined. Furthermore the limits and possibilities of the setup in use are investigated. As an example the differences in fabrication with the laser firing with "constant frequency" and "constant density" were subject of this investigation. The second goal of the study was to compare three different structures consisting of periodically repeating elements, scaled in size and number of elements per side.

Design and Build a Laser Shooting Training System Monitored Using a Smartphone

Shooting drills were carried out with very limited ammunition support. This is easy to understand because shooting drills are expensive and have a very high safety risk. Therefore, in order for shooting practice to be optimal, safe, inexpensive and can be carried out at any time, it is necessary to immediately realize shooting practice by utilizing advances in science and technology (lasers). The aim of this research is to develop a shooting training system with laser firing to save bullets during shooting practice and to make it easier for shooters and judges to monitor the results of shooting accuracy via the web or smartphone. The system itself consists of a laser and light sensor which is interfacured with a microcontroller and wifi shield as data transmission.

High repetition rate Petawatt lasers

Petawatt lasers are now available in a number of facilities around the world and are becoming a very useful tool in physics and engineering. Some of such lasers are able -or will be able soon- to fire at high repetition rates (one shot per second or more). Experiments at such repetition rates have certain peculiarities that are to be briefly exposed here, based on the author’s experience with the Salamanca VEGA-3 laser. VEGA-3 is a 30 fs PW laser, firing one shot per second.