scholarly journals SOME NOTES ON CHEMICAL LABORATORY EQUIPMENT

1907 ◽  
Vol 7 (9) ◽  
pp. 751-752
Author(s):  
R. M. Hughes
Keyword(s):  
Laboratory Equipment ◽  
Chemical Laboratory

Penanganan Alat Dan Bahan Yang Baik Dalam Rangka Menunjang Kegiatan Di Laboratorium Kimia

METANA ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 58
Author(s):  
Raharjo Raharjo ◽  
Sri Harjanto
Keyword(s):  
Chemistry Laboratory ◽  
Laboratory Equipment ◽  
Chemical Laboratory ◽  
Laboratory Environment ◽  
Handling System ◽  
Research Activities

Fasilitas alat dan bahan di lingkungan laboratorium kimia bagi mahasiswa yang sedang menyelesaikan tugas penelitian merupakan suatu hal yang tidak bisa terpisahkan, dan sangat diperlukan keberadaanya. Maka  sistem kelola, cara penanganan dengan  baik dan benar terutama  yang berhubungan dengan bahan kimia ataupun alat gelas dan instrumen mulai dari proses pengadaan, penerimaan , pengemasan, penyimpanan sampai penyaluran, penggunaan sesuai dengan tata kelola yang baik dan benar, juga ditunjang pelayanan yang memadai akan sangat membantu dalam rangka penyelesaian kegiatan penelitian mahasiswa Tugas Akhir di laboratorium kimia. Handling of good equipments and materials to order to supply activities studensts at the chemical laboratory  Equipment and materials facilities in chemical laboratory environment for students who are completing research tasks is an inseparable, and indispensable condition. Therefore, good and proper handling system, especially those related to chemicals or glassware and instruments starting from the procurement, receiving, packaging, storage until distribution, use in accordance with good and correct governance, also supported by adequate services will very helpful in the completion of research activities of Final Final students in the chemistry laboratory.

scholarly journals Pemeliharaan Dan Penyimpanan Peralatan Laboratorium Kimia

2009 ◽  
Vol 1 (1) ◽  
pp. 26
Author(s):  
Jufriyah Jufriyah ◽  
Isna Mar'ah ◽  
Kelik Isharyudono
Keyword(s):  
Life Span ◽  
Working Life ◽  
Classification Method ◽  
Direct Impact ◽  
Laboratory Equipment ◽  
Chemical Laboratory ◽  
Frequency Of Use ◽  
Group Frequency ◽  
And Storage

Improper maintenance and storage of laboratory equipment, will shorten the life span. Damage to the tool will have a direct impact on the costs that must be incurred to replace damaged equipment components or even procurement of new equipment. The purpose of this paper is to provide an understanding of how to maintain and store chemical laboratory equipment. And can identify damage to chemical laboratory equipment. Broadly speaking, the tool maintenance method is divided into two parts: planned maintenance and unplanned maintenance. For storage of tools using the classification method based on the tool group, frequency of use and the nature of the tool. Maintenance and storage of chemical laboratory equipment is an activity process in order to anticipate damage as early as possible so that it can increase the efficiency of the working life of the equipment used. So that the chemical laboratory equipment can function optimally and always in a state of ready use, it is necessary to have knowledge about how to maintain and store laboratory equipment and how to identify equipment damage as early as possible. Maintenance and storage of chemical laboratory equipment properly can prevent damage to chemical laboratory equipment that will extend the life of the equipment, and ensure the comfort and safety of the user.

scholarly journals Pengembangan video penggunaan alat gelas laboratorium kimia di universitas

2017 ◽  
Vol 3 (2) ◽  
pp. 161
Author(s):  
Khusna Arif Rakhman ◽  
A. Rasyid Saraha ◽  
Nurfatimah Sugrah
Keyword(s):  
Development Stage ◽  
Practical Implementation ◽  
First Year ◽  
Chemistry Department ◽  
Laboratory Equipment ◽  
Chemical Laboratory ◽  
Media Development ◽  
First Year Students ◽  
Video Use ◽  
Development Methods

Telah dilakukan peneletian tentang pengembangan media video penggunaan alat gelas di Laboratorium pada mahasiswa tahun I Program Studi Pendidikan Kimia. Penelitian ini bertujuan menghasilkan video penggunaan alat gelas di laboratorium yang layak digunakan sebagai panduan mahasiswa program studi pendidikan kimia FKIP Universitas Khairun dalam melakukan praktikum. Media video pengguaan alat gelas di Laboratorium ini dikembangkan berdasarkan kaidah pengembangan media pembelajaran yang diadaptasi dari tahap pengembangan 4D. Hasil pengembangan berupa video pengenalan dan penggunaan alat gelas di laboratorium dengan durasi 18 menit. Dari segi validitas media video, kedua produk tersebut dinyatakan sangat valid oleh 3 orang validator dengan nilai rata-rata 3,81 dari skala 4 dengan kategori sangat valid. Produk media video juga diukur keterbacaannya oleh 10 mahasiswa prodi pendidikan kimia FKIP Universitas Khairun dengan persentase keterbacaan sebesar 79,17%. Sedangkan angka keterlaksanaan praktikum menggunakan panduan kedua video tersebut di Laboratorium sebesar 67,50%. Video Development of Use of Chemical Laboratory Equipment in University AbstractThe research has been conducted to develop of video use of glassware in the laboratory at the first year students of the educational chemistry department. This study aims to produce a video of glass tools usage in a laboratory that was suitable to be used as a practicum module for students of educational chemistry department FKIP Khairun University. Video development methods based on learning media development principles adapted from the 4D development stage. The results of the development of a video introduction and use of glassware in the laboratory with a duration of 18 minutes. The validity of both was expressed by 3 validators with an average rating of 3.81 from a scale of 4 with very valid categories. Video products are also measured legibility by 10 students of educational chemistry department FKIP Khairun University with a percentage of legibility of 79.17%. While the practical implementation the video usage on practicum in the Laboratory of 67.50%.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

The system of indicators of the quality of the carbon-carbon composite materials and technologies of their production

2018 ◽  
pp. 127-132
Author(s):  
T. N. Antipova ◽  
D. S. Shiroyan
Keyword(s):  
Composite Material ◽  
Low Cost ◽  
Experimental Studies ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Optimal Number ◽  
Laboratory Equipment ◽  
Carbon Composite Material ◽  
Carbon Composite Materials

The system of indicators of quality of carbon-carbon composite material and technological operations of its production is proved in the work. As a result of the experimental studies, with respect to the existing laboratory equipment, the optimal number of cycles of saturation of the reinforcing frame with a carbon matrix is determined. It was found that to obtain a carbon-carbon composite material with a low cost and the required quality indicators, it is necessary to introduce additional parameters of the pitch melt at the impregnation stage.

scholarly journals X-ray Determination of Compressive Residual Stresses in Spring Steel Generated by High-Speed Water Quenching

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1154
Author(s):  
Diego E. Lozano ◽  
George E. Totten ◽  
Yaneth Bedolla-Gil ◽  
Martha Guerrero-Mata ◽  
Marcel Carpio ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
High Speed ◽  
Spring Steel ◽  
X Ray Diffraction ◽  
Laboratory Equipment ◽  
X Ray ◽  
Water Chamber ◽  
Hardened Case ◽  
Compressive Residual Stresses

Automotive components manufacturers use the 5160 steel in leaf and coil springs. The industrial heat treatment process consists in austenitizing followed by the oil quenching and tempering process. Typically, compressive residual stresses are induced by shot peening on the surface of automotive springs to bestow compressive residual stresses that improve the fatigue resistance and increase the service life of the parts after heat treatment. In this work, a high-speed quenching was used to achieve compressive residual stresses on the surface of AISI/SAE 5160 steel samples by producing high thermal gradients and interrupting the cooling in order to generate a case-core microstructure. A special laboratory equipment was designed and built, which uses water as the quenching media in a high-speed water chamber. The severity of the cooling was characterized with embedded thermocouples to obtain the cooling curves at different depths from the surface. Samples were cooled for various times to produce different hardened case depths. The microstructure of specimens was observed with a scanning electron microscope (SEM). X-ray diffraction (XRD) was used to estimate the magnitude of residual stresses on the surface of the specimens. Compressive residual stresses at the surface and sub-surface of about −700 MPa were obtained.

The Use of Microcomputer Simulations in Undergraduate Neurophysiology Experiments

1987 ◽  
Vol 14 (3) ◽  
pp. 134-140 ◽  
Author(s):  
K.A. Clarke
Keyword(s):  
Low Cost ◽  
Animal Experiments ◽  
Theoretical Background ◽  
General Purpose ◽  
Microcomputer System ◽  
Laboratory Equipment ◽  
Teaching Objectives ◽  
Compound Action Potentials ◽  
Experimental Management ◽  
And Performance

Practical classes in neurophysiology reinforce and complement the theoretical background in a number of ways, including demonstration of concepts, practice in planning and performance of experiments, and the production and maintenance of viable neural preparations. The balance of teaching objectives will depend upon the particular group of students involved. A technique is described which allows the embedding of real compound action potentials from one of the most basic introductory neurophysiology experiments—frog sciatic nerve, into interactive programs for student use. These retain all the elements of the “real experiment” in terms of appearance, presentation, experimental management and measurement by the student. Laboratory reports by the students show that the experiments are carefully and enthusiastically performed and the material is well absorbed. Three groups of student derive most benefit from their use. First, students whose future careers will not involve animal experiments do not spend time developing dissecting skills they will not use, but more time fulfilling the other teaching objectives. Second, relatively inexperienced students, struggling to produce viable neural material and master complicated laboratory equipment, who are often left with little time or motivation to take accurate readings or ponder upon neurophysiological concepts. Third, students in institutions where neurophysiology is taught with difficulty because of the high cost of equipment and lack of specific expertise, may well have access to a low cost general purpose microcomputer system.

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