Simple device for spectroscopy laboratory exercises

Undergraduate physics laboratory exercises are very important in shaping students’ attitude to science, especially for future teachers. Recently, it is necessary to look for ways to easily create large quantities of experimental sets, not only for institutional use, but also for sets that can be produced in large quantities and distributed for use in distance learning. In this paper, we briefly describe the various ways to support the teaching of wave optics, and then describe one of the possible methods for performing undergraduate spectroscopic measurements using a 3D printed spectroscope and light source.

Series of Photovoltaic Converters Based on Semiconductors with Intrinsic Photoconductivity

One of the ways to solve multiple problems of optical diagnostics is to use photovoltaic converters based on semiconductors with intrinsic photoconductivity slightly doped with deep impurities which form several energy levels with different charge states within the semiconductor′s bandgap. Peculiarities of physical processes of recharging these levels make it possible to construct photodetectors with different functionality based on a range of simple device structures.The aim of this work is to analyze peculiarities of conversion characteristics of single-element photovoltaic converters based on semiconductors with intrinsic photoconductivity, to systematize their properties and to represent structures of photovoltaic convertors as a device structures suitable for implementation in measurement transducers of optical diagnostics systems.Based on the analysis of the characteristics of the conversion characteristics of single-element photovoltaic converters based on semiconductors with intrinsic photoconductivity and the requirements for their design, a dash series of photovoltaic converters was developed for use in the measuring transducers of optical diagnostics systems. The possibility of constructing functional measuring transducers for multiparameter measurements of optical signals is shown.

Stereotactic guide for posterior approach to lateral ventricle

Background Free-hand tapping of the lateral ventricle through the posterior approach is a standard procedure. There are occasions, however, when more than one pass is needed. One way to make it easy and safe is to use a neuro-navigation approach. This requires extra setup. Therefore, the authors in this paper describe the use of a simple device to accurately place the catheter tip in the frontal horn. Main body The device is rectangular with two open arms with co-linear free ends. Based on axial CT or MR images, a trajectory that travels within the ventricle from the posterior to the anterior horn is chosen. The anterior and posterior points of the trajectory are marked on the scalp. A burr hole is placed at the posterior point. The anterior free end is then attached to the anterior trajectory point on the scalp using an EKG pad and to the posterior to a plug placed in the burr hole. The ventricle is tapped through a central hole in the burr hole plug. All 12 patients had accurate catheter placement at the first attempt using this system. Short conclusion This is a simple device that used CT or MR images and surface markings to accurately tap the ventricle.

Pengembangan prototipe sistem track timer untuk pengukuran kecepatan secara otomatis pada sprint 60-meter

Saat ini sedang berkembang pencatatan waktu otomatis yang dijual oleh beberapa perusahan perlatan olahraga ternama seperti. Namun sayangnya, harga perangkat tersebut sangatlah mahal, dan membuat setiap pelatih ataupun praktisi olahraga terkendala untuk mendapatkannya. Karena fakta dan permasalahan tersebut, maka penelitian ini bertujuan untuk mengembangkan prototipe sistem pencatatan waktu untuk pengukuran kecepatan secara otomatis pada sprint 60-meter, dengan menggunakan perangkat sederhana dengan harga yang murah, namun memiliki tingkat presisi dan akurasi yang baik. Penelitian ini menggunakan metode penelitian research and development, dimana dalam proses pengembangan dan pembuatan pencatatan waktu otomatis, penelitian ini mengambil contoh dari timing gate yang sudah divalidasi sebelumnya. Dalam penelitian ini, kami juga sudah melakukan uji coba kepada 12 atlet sprinter (tinggi badan 172.8 ± 9.31, berat badan 61.05 ± 6.90, BMI 20.38 ± 0.87) terkait kegunaan alat tersebut. Rata-rata kecepatan lari seluruh subjek pada pos 10-meter adalah 2.44 ± 0.23 detik, pos 20-meter adalah 3.71 ± 0.18 detik, pos 30-meter adalah 4.75 ± 0.22 detik, pos 40-meter adalah 6.39 ± 0.31 detik, 50-meter adalah 7.65 ± 0.41 detik, dan 60-meter adalah 9.12 ± 0.49 detik. Penelitian research and development terkait pengembangan pencatatan waktu otomatis dalam penelitian ini, menunjukkan bahwa pencatatan waktu otomatis dapat dibuat dengan harga ekonomis, dan dapat digunakan untuk mengukur kecepatan lari 60-meter. Development of track timer prototype system for automatic speed measurement on 60-meter sprints AbstractCurrently, automatic track timers are being sold by several well-known sports equipment companies. Unfortunately, the price of the device is very expensive and makes every coach or practitioner constrained to get it. Because of these facts and problems, this research was aimed to develop a prototype track timer system for automatic speed measurement on a 60-meter sprint, using a simple device at a low price, but has a good level of precision and accuracy. This study used to research and development research methods, wherein the process of developing and manufacturing automatic track timers, this study takes the example of a timing gate that has been validated before. In this study, we have also tested 12 sprinters (height 172.8 ± 9.31, weight 61.05 ± 6.90, BMI 20.38 ± 0.87) related to the use of the tools. The average running speed of all subjects on a 10-meter post is 2.44 ± 0.23 seconds, a 20-meter post is 3.71 ± 0.18 seconds, a 30-meter post is 4.75 ± 0.22 seconds, a 40-meter post is 6.39 ± 0.31 seconds, 50- The meter is 7.65 ± 0.41 seconds, and the 60-meter is 9.12 ± 0.49 seconds. This research shows that track timers can be made at economical prices, and can be used to measure 60-meter running speed.

Proof of concept simple conductive thread stitch sensor to measure the duration of kangaroo care

Throughout the world thousands of infants are born each day according to the World Health Organization. All infants can benefit from the use of Kangaroo Care (KC) or bare skin-to-skin contact between caregiver and infant. One of the key principles to getting the most from KC is that is must be performed for at least one hour according to the World Health Organization. Yet, the duration of KC is rarely measured. This study explores the use of a simple device, a conductive thread stitch sensor coupled with a pair of magnets and a microcontroller, to measure the duration of KC automatically. For this study, a single subject used the sensor with a specific KC garment and performed KC with a weighted doll. It was determined, that when comparing manual timed values of the duration of KC to the sensor values, there was 6.43±5.67% average percentage difference. This proof of concept shows that this simple device can be used to determine the duration of KC in an effective manner.

Facilitated crystal handling using a simple device for evaporation reduction in microtiter plates

In the past two decades, most of the steps in a macromolecular crystallography experiment have undergone tremendous development with respect to speed, feasibility and increase of throughput. The part of the experimental workflow that is still a bottleneck, despite significant efforts, involves the manipulation and harvesting of the crystals for the diffraction experiment. Here, a novel low-cost device is presented that functions as a cover for 96-well crystallization plates. This device enables access to the individual experiments one at a time by its movable parts, while minimizing evaporation of all other experiments of the plate. In initial tests, drops of many typically used crystallization cocktails could be successfully protected for up to 6 h. Therefore, the manipulation and harvesting of crystals is straightforward for the experimenter, enabling significantly higher throughput. This is useful for many macromolecular crystallography experiments, especially multi-crystal screening campaigns.