Performance Comparison Between Hot Mirror and Cold Mirror as a Beam Splitter on Photovoltaic - Thermoelectric Generator Hybrid Using LabVIEW Simulator

Solar energy can be converted into electrical energy using photovoltaic (PV) and thermoelectric generators (TEG). In order to increase the effectiveness of energy absorption, a hot mirror or cold mirror spectrum separator is used. In this study, a simulation was carried out to see the effect of the cold mirror and hot mirror spectrum separator on the performance of the PV-TEG hybrid. Simulations are carried out using the LabVIEW program. The standard for the solar radiation spectrum used is AM1.5D. The incoming radiation is transmitted using a Fresnel lens to make it more focused and then transmitted to a cold mirror or hot mirror, where the spectral irradiance will be halved. Spectral irradiance with a wavelength of 400-690 nm will be directed to PV and a wavelength of 710-1150 nm will be directed to TEG. From the PV-TEG hybrid modeling and simulation using the LabVIEW program, the resulting power and efficiency are 240.635 W/m2 and 27% respectively for cold mirror and 228.835 W/m2 and 25.76% for hot mirror.

Development of a Novel Wireless Multi-Channel Stethograph System for Monitoring Cardiovascular and Cardiopulmonary Diseases

A multi-channel stethograph system was designed and developed as an electronic auscultation system for graphic recording of heart, lung and trachea (HLT) sounds non-invasively through a set of 16 acoustic sensors. The multi-channel stethograph system was fabricated by placing 16 microphone based acoustic sensor in a CNC machined Delrin® housing cases that are covered using diaphragms. Among the 16 acoustic sensors, 14 were positioned in a memory foam pad and 2 were placed directly on the heart and trachea to acquire sounds simultaneously from the lungs, heart and trachea. The sounds acquired from the 16 acoustic sensors were processed through a custom designed and fabricated 16-channel PCB for signal conditioning. A National Instruments (NI) 9205 data acquisition device (DAQ) along with a NI 9191 wireless chassis was used to acquire and wirelessly transmit the data from the 16-channel PCB to a Wi-Fi enabled device such as a PC/tablet. A custom LabVIEW program was developed on a Wi-Fi enabled PC/tablet to record the data from the DAQ. In addition, a MATLAB program was developed to convert the recorded data from the acoustic sensors into 16 audio files (for audio playback) and plot the waveforms in time and frequency domain as well as spectrogram for visual examination of any abnormal patterns in inhalation and exhalation. This provides critical information on the presence of wheezes, crackles and rhonchi sounds as well as abnormal heartbeat and respiration rate which helps in analyzing the condition of heart and lungs. The graphically displayed HLT sounds will help physicians in the clinical diagnosis and monitoring of lung and heart disorders, particularly chronic obstructive pulmonary disease (COPD), asthma, pneumonia, and congestive heart failure by providing objective evidence.

Humik Asit Üretiminde Kullanılan Karıştırıcıların Kaotik Sistemler İle Performanslarının İyileştirilmesi

In this study; it is aimed to increase the efficiency of the mixers in terms of important criteria such as product quality, homogeneity, time and energy saving by using chaotic systems instead of traditional mixing methods in the production of humic acid, which is one of the most widely used plant nutrition and soil conditioning products in our country and in the world. Based on these properties of chaotic systems: For experimental studies; by designing A PLC (Programmable Logic Controller) controlled mixer, whose all functions can be controlled by the HMI (Human Machine Interface) operator panel, was manufactured. In this mixer, liquid humic acid was obtained by mixing water, leonardite and potassium hydroxide (KOH). For chaotic mixing process; chaotic systems with different dynamic properties had been selected from the literature. The differential equations of these chaotic systems were solved according to the Runge Kutta 45 (RK45) numerical solution algorithm in an interface program developed in the Labview program, and the chaotic time series results of each chaotic system were obtained. By transforming those results into frequency datas with the program written on the PLC device, the mixer motor connected to the frequency inverter was provided to rotate in variable speeds according to the selected chaotic systems. By means of obtaining same mixture also with traditional methods (constant speed), the comparison was done in terms of product quality, solute ratio, pH values and total energy consumption. With respect to the derived results; it has been observed that mixing done by using chaotic systems is more efficient than traditional mixing methods in terms of criterion such as product quality, homogeneity, time and energy savings.

LabVIEW virtual instrument for zone penetration studies in flow-based analytical systems

In the flow method development, zone penetration studies are usually conducted as a part of initial screening phase. A lack of an appropriate tool can keep these studies on the level of rough estimations. The developed LabVIEW virtual instrument (VI) which processes peak signals and calculates the overlapping area and fundamental peak-related parameters was used for calculations in experiments that are modelling sample and reagent plug interaction within liquid conduits. The reliability of the predictions was initially confirmed on the artificial data set based on thirty-six files covering all the different types of cases that can be foreseen. In the continuation, volumes of model solutions, propelling flow rate, and coil length in the sequential injection analysis system, were varied by following Box-Behnken response surface design. In three examples, it is demonstrated how the VI can help us plan further experiments in the range which ensures efficient zone overlapping, economic exploitation of reagent plug and adequate dispersion. The application of the VI is not limited just to flow-based chemistry, it can also be useful in spectroscopy and chromatography. To utilize the graphical user interface, it is not necessary to have the LabVIEW program installed.

DEVELOPMENT OF SOFTWARE FOR QUANTUM VOLTAGE SYNTHESISER

Signal analysis is a wide area of research, which received considerable attention due to its numerous fields of application. The impact of these fields in technological advancement cannot be overemphasized. No matter how good a signal is acquired, it can still contain some unwanted components (noise) that is capable of undermining its integrity. This work synthesizes signal from a delta-sigma system by designing digital filters LabVIEW program. The designed lowpass and bandpass filters were examined in addition to different filter design algorithms. Based on the analysis, Dolph-chebyshev and Kaiser window filters provide excellent filtering by blocking quantization noise to up to -40dB for fixed point design and, -60dB for floating point. Despite issues with windowing in filter design, these two algorithms seem to work well with this type of signal. Additionally, this design can be optimised by pushing the filter to its limit.

Switchgrass Bale Automatic Weighing and Watering System

The purpose of this study was to maintain minimum moisture content for switchgrass bales that were inoculated with Pleurotus ostreatus, a white-rot fungus, in order to start the breakdown of lignin for conversion to ethanol. The moisture content was to be maintained above 50%, which would be monitored using load cells to determine the weight. Three bales were used, and thermocouple wires and hose system were placed at four points inside each bale. In addition, the ambient temperature and relative humidity inside the building were monitored. Bales were inoculated with 1%, 2%, and 3% grain spawn by mass. The inoculation was carried out by taking the bale apart in four places and sprinkling or spreading the fungal spawn over the bale. In order to continuously record the voltage readings from the strain gauges, NI USB-6225 data logger and National Instruments’ LabVIEW program was used to record and control the system. The develop automatic weighing and watering system had been able to maintain the bale moisture within the acceptable range and the fungus were observed growing. Some issues related to voltage readings and uniformity of water distribution must be addressed for future work.

Perancangan Sistem Multi Computer Numerical Control (CNC) untuk Plotter dan Laser Engraving

ABSTRAK – Tujuan dari penelitian ini adalah membuat CNC yang memiliki 2 fungsi dalam 1 sistem. Dengan memanfaatkan USB serial untuk komunikasi antara komputer dan mikrokontroler. Program untuk mengoperasikan CNC dirancang dengan menggunakan perangkat lunak LabVIEW, program akan mengkonversi gambar menjadi G-Code dan mengirim G-Code ke dalam sistem CNC untuk melakukan proses plotter atau laser engraving. CNC Plotter dapat membuat sebuah pola gambar pada kertas dengan bolpoin secara otomatis. Sedangkan CNC Laser Engraving dapat membuat sebuah gravir pada kayu dengan memanfaatkan panas laser, panas laser akan mengikis permukaan kayu secara otomatis. Dalam merancang multi CNC 2 buah motor stepper digunakan sebagai akuator penggerak sumbu, dan untuk penggerak bolpoin menggunakan motor servo. Adapun laser yang digunakan untuk gravir kayu menggunakan dioda laser berdaya 500 mw. Berdasarkan hasil pengujian dalam penelitian ini, Program pada LabVIEW dapat mengkonversi gambar menjadi G-Code laser, dan program dapat mengirim G-Code ke dalam sistem CNC, sehingga CNC dapat melakukan proses grafir laser pada kayu serta dapat mengatur ketebalan grafir sesuai dengan kebutuhan. Adapun kecepeatan pemakan ideal 50-500 mm / menit dan kecepatan pemakan maksimal 2000 mm / menit. Sementara itu, CNC Plotter dapat mencetak sebuah gambar bidang berbentuk kotak dengan ukuran terkecil 2 mm x 2 mm, dan lingkaran dengan diameter terkecil 2 mm dengan tingkat akurasi 100%. Maksimal dimensi gambar yang dapat dikerjakan Multi CNC ini 300 mm x 300 mm. Kata Kunci – Multi CNC, LabVIEW, G-Code, Mikrokontroler.

Diseño artrópodo en robots móviles para evaluación de espacios confinados

In this project, a prototype was made that is very useful in the industry of the Lazaro Cardenas region, specifically in the area of safety, both in the preparation of fertilization and in mining, given that it arises from the direct need of the worker to exposing themselves to places where pollution levels are high, and are not naturally perceptible to human smell, in the case of gases, or visibility and access, in the case of confined spaces, thus making the use of mobile robots be A viable implementation alternative to avoid puts human life at risk. By means of an ARDUINO MEGA microcontroller and six pairs of servo motors model SG90 embedded in what corresponds to the joints of the legs of the hexapod spider robot, with the appropriate programming the movement of this robot is carried out and with the help of sensors gas, temperature and humidity will be possible to prevent a large number of accidents, by detecting the presence of a gas harmful to health or a temperature at which it is impossible to work and even survive in this area. The LabVIEW program was used to program the interface of the sensors that detected any anomaly present in the environment, and thus a record of any risk can be kept.