Theoretical Studies of the Interaction between Screw Surface and Material in the Mixer

Mixing is one of the most commonly used processes in food, animal feed, chemical, cosmetic, etc., industries. It is supposed to provide high-quality homogenous, nutritious mixtures. To provide appropriate mixing of materials while maintaining the process high efficiency and low energy consumption it is crucial to explore and describe the material flow caused by the movement of mixing elements and the contact between particles. The process of mixing is also affected by structural features of the machine components and the mixing chamber, speed of mixing, and properties of the mixed materials, such as the size of particles, moisture, friction coefficients. Thus, modeling of the phenomena that accompany the process of mixing using the above-listed parameters is indispensable for appropriate implementation of the process. The paper provides theoretical power calculations that take into account the material speed change, the impact of the material friction coefficient on the screw steel surface and the impact of the friction coefficient on the material, taking into account the loading height of the mixing chamber and the chamber loading value. Dependencies between the mixer power and the product degree of fineness, rotational speed of screw friction coefficients, the number of windings per length unit, and width of the screw tape have been presented on the basis of a developed model. It has been found that power increases along with an increase in the value of these parameters. Verification of the theoretical model indicated consistence of the predicted power demand with the power demand determined in tests performed on a real object for values of the assumed, effective loading, which was 65–75%.

Hubungan Pengetahuan Dan Sikap Karyawan Terhadap Kepatuhan Dalam Menggunakan Alat Pelindung Diri (APD) Di Pt. Semen Batu Raja Unit Panjang Bandar Lampung

ABSTRACT : EMPLOYEE KNOWLEDGE AND ATTITUDE RELATIONSHIP TOWARDS COMPLIANCE IN USING PERSONAL PROTECTIVE EQUIPMENT (PPE) AT PT. SEMEN BATURAJA PANJANG UNIT BANDAR LAMPUNG Background : One company that needs attention to work accidents is PT.foCement BatuRaja Unit Panjang Bandar Lampung. This company is a global company engaged in cement marketing. Each part has the potential for hazards to occur at work accidents. The result of interviews with 14employees, 5 people said that they had experienced a work accident in the form of being pierced by nails and pinched by objects and 9 people said that they had been hit by iron and fell from a ladder. ThePurpose : of this reseach is to know the relationship between knowledge and attitudes of employees towards compliance in using personal protective equipment (PPE) at PT. Semen BatuRaja, Bandar Lampung Length Unit in 2020.Methods : This type of reseach is quantitative and the design in this study uses analytic using a cross sectional approach. The population in this study were all labor employess at PT. Semen BatuRaja Unit Panjang Bandar Lampung specifically for the factory section. From January to june 2020, there were 133 employees, so a sample of 50 respondents was obtained. In this study the sampling technique used was Simple Random Sampling. In processing data, researchers used Chi-Square data analysis.Result : It was found that 31 respondents had poor knowledge (62.0%), 26 respondents (52.0%) had negative attitudes and 26 respondents (52.0%) did not comply with PPE, obtained a p-value of 0.049. or p-value, < 0.05, there is a relationship between employee knowledge and compliance in using PPE with an OR value of 3.939 and a p-value of 0.005 or p-value <0.05, there is a relationship between employee attitudes and compliance in using PPE with an OR value of 6.529.Conclusion : Based on the results of statistical tests, it was found that there was a relationship between knowledge and attitudes of employees with compliance in using PPE. PT parties must conduct training and health seminars on the importance of using PPE, and it is hoped that PT supervision officers can improve performance by always providing supervision and monitoring of employee performance. Keywords : Knowledge, Attitude and ComplianceINTISARI : HUBUNGAN PENGETAHUAN DAN SIKAP KARYAWAN TERHADAP KEPATUHAN DALAM MENGGUNAKAN ALAT PELINDUNG DIRI (APD) DI PT. SEMEN BATU RAJA UNIT PANJANG BANDAR LAMPUNG Pendahuluan :Salah satu perusahaan yang perlu mendapat perhatian terhadap kecelakaan kerja adalah PT. Semen Batu Raja Unit Panjang Bandar Lampung. Perusahaan ini merupakan perusahaan global yang bergerak dalam bidang marketing semen. Masing-masing bagian mempunyai potensi terhadap bahaya untuk terjadinya kecelakaan kerja. Dari survey awal yang dilakukan oleh peneliti di PT Semen Batu Raja Panjang Bandar Lampung. Pada saat dilakukan observasi peneliti menemukan 14 orang karyawan tidak menggunakan alat pelindung diri (APD) dengan lengkap. Hasil wawancara dengan 14 orang karyawan tersebut 5 orang mengatakan bahwa pernah mengalami kecelakaan kerja berupa tertusuk paku dan terjepit benda dan 9 orang mengatakan bahwa pernah tertimpa besi dan jatuh dari tangga.Tujuan: Untuk Mengetahui Hubungan Pengetahuan Dan Sikap Karyawan Terhadap Kepatuhan Dalam Menggunakan Alat Pelindung Diri (APD) Di PT. Semen Batu Raja Unit Panjang Bandar Lampung Tahun 2020Metode : Jenis penelitian kuantitatif dan rancangan dalam penelitian ini menggunakan analitik dengan menggunakan pendekatan cross sectional . Populasi dalam penelitian ini adalah seluruh karyawan buruh Di PT. Semen Batu Raja Unit Panjang Bandar Lampung khusus bagian pabrik Terhitung sejak Januari-Juni 2020 berjumlah 133 karyawan, sehingga di dapatkan sampel sejumlah 50 responden. Dalam penelitian ini teknik sampling yang digunakan adalah SimpleRandom SamplingKesimpulan : Berdasarkan hasil uji statistik, didapatkan ada hubungan pengetahuan dan sikap karyawan dengan kepatuhan dalam menggunakan APD Di PT.Semen Batu Raja Unit Panjang Bandar Lampung Tahun 2020 dengan nilai p-value pengetahuan;0,049 dan sikap:0,005.Saran :Pihak PT harus melakukan pelatihan serta seminar kesehatan tentang pentingnya penggunaan APD, serta diharapkan agar petugas supervisi PT agar dapat meningkatkan kinerja dengan cara selalu memberikan pengawasan serta pemantauan terhadap kinerja Karyawan disetiap ruangan dan melakukan penilaian terhadap masing-masing Karyawan dan memberikan teguran bahkan sanksi tegas jika mengetahui ada sebagian Karyawan yang tidak menggunakan APD yang telah disesuaikan oleh pihak PT. Kata Kunci: Pengetahuan, Sikap Dan Kepatuhan

Problems of Insulation Diagnostics of Power Equipment by the Method of Partial Discharges

Target. High information value and reliability of diagnostics of isolation by partial discharges. Methods. Simulation of PD in Multisim and calculation of electrical fields of insulation defects by finite element method in the program ComSol. Results. A strong influence of the power supply on the value of voltage surge in case of emergency has been established. The method of adjustment of this influence is proposed. It was found that the oscillatory form of the PD is mainly determined not by the parameters of the insulation defect, but by the parameters of the energy object in which this defect is observed. Method for separation of aperiodic signal of PD from oscillatory component of system transient process in PD is proposed. It is shown that in operating turbogenerators and power transformers the unambiguous connection between the phase of PD occurrence and the voltage of PD occurrence is broken. Method of determination of PD occurrence place in slot part of turbogenerators is proposed. It is shown that in order to increase the reliability of comparing PD in polymer insulation of power cables of different voltage classes and geometric dimensions, when calibrating the measuring system, it is necessary to take into account the speed of propagation of the PD pulse through the cable and the capacity of the cable length unit. The concept of a corrective coefficient for calibration has been introduced and a method for determining it has been proposed. Conclusions. Taking into account the differences in PD parameters in real objects of the electric power industry, proposed in the article, from the parameters obtained in the standard laboratory model of the PD should increase the information and reliability of the PD method, as well as make it possible to conduct a comparative analysis of the results obtained under various observation conditions.

IMPROVING THE METHODOLOGY FOR METROLOGICAL CERTIFICATION OF TOTAL STATIONS AND LIGHT RANGE FINDERS

To ensure the uniformity of measurements, it is necessary to perform periodic verifications of ge-odetic instruments in accordance with the requirements of the relevant regulatory documents. In relation to total stations and light meters, ensuring the uniformity of measurements should be carried out by conducting annual periodic checks with the use of stationary reference bases of the 2nd or 3rd category, which were previously created in almost all regions of the country. However, to date, only two such bases have been preserved on the territory of the Russian Federation. The reason for this situa-tion was the lack of proper metrological support for the line lengths of the reference bases themselves, caused by the need for organizational measures, the lack of trained specialists, as well as significant financial expenses for field work. In this regard, there was a scientific and technical task of developing a local calibration scheme (LCS) to provide periodic verifications of total stations and light-emitting diodes over the entire range of measured distances, which does not require the creation of stationary reference bases. For this purpose, the LCS scheme is proposed, based on the use of the method of direct distance measurements. Its essence lies in the simultaneous measurement of the selected distances by reference and verified total stations. To do this, a reference total station and a verifiable one are installed on two tripods located next to each other, which measure the same distance. After that, the total stations are swapped and the measurements are repeated. At the end of the measurement, the measured distances are compared with the reference and verified total stations. Then, based on the difference between these distances, a conclusion is made about the accuracy of the de-vice being tested, as stated in the technical data sheet. The results of the implementation of the proposed LCS showed that its scheme provides the accuracy of measurements at the level of the 2nd category reference basis, and the methodology and accuracy of the length unit transmission meets the of regulatory requirements.

State primary special standard of length in the field of measurements of deviations from straightness and flatness GET 130-2019

The information on content, theory of operation and metrological concepts of the State primary special standard of length unit in the field of measurements of deviations from straightness and flatness, GET 130-2019, conducted in 2019, is provided. The results of metrological characteristics research of the measuring interference system included in GET 130-2019 are described. With the help of an additional measuring interference system, the unit is reproduced on the basis of fundamental physical constants and the properties of matter – interference, which eliminates additional instrumental sources of errors (uncertainties). The transfer of length in the field of measurements of deviations from straightness and flatness in the range from 0 to 50 μm on the length of the measured surface up to 30 m with the highest accuracy in Russia is ensured. The conducted comparisons proved that metrological characteristics of GET 130-2019 correspond to those presented in the database of measuring capabilities of the International Bureau of Weights and Measures (BIPM) on the already confirmed by means of stationary and autonomous measuring profile length to 5 m, as well as the level of foreign standards, presented in BIPM on the length to 30 m.

TBLA Mastery of Mathematical Concepts Through TPS (Think Pair Share) Learning Model Aided by Conversion Tool Games

The level of understanding of mathematical concepts is still low due to the lack of application of learning models and media that can improve students' mastery of concepts. The purpose of this study was to reveal the construction pattern of mastery of mathematical concepts through the TPS learning model assisted by conversion tool games using Transcript Based Learning Analysis (TBLA). This study involved 28 students of grade 5. In this study, it was divided into 2 cycles, namely cycle 1 focused on the unit length conversion material while the cycle concentrated on the material addition and subtraction of length unit conversion. Activities in each cycle will be recorded via video or audio, then the recording will be used as a transcript of the learning dialogue then analyzed with the type of communication reson. In addition to transcript analysis in the last activity students are given a written exam through LKS (Student Work Sheet). This study obtained the results that in the first cycle the class average value reached 75.36, the second cycle the average value reached 78.93, and the graduation percentage value reached 82%. So it can be concluded that this research is related to the mastery of the concept of addition and reduction in the conversion of units of length which is successful

Functioning of the multilinear lag-cascade flood routing model as a means of transporting pollutants in the river

The purpose of this paper is to use the application of the multilinear lag cascade model as a contaminant transport model through river networks. Monocacy River and Antietam Creek data, which were collected by USGS with different reach lengths and discharge conditions, have been used in the current study. It was found that the multilinear discrete lag-cascade (MDLC) model is capable of reconstructing contaminant breakthrough curves. A complete study was performed to estimate the reach length for use in the accurate simulation, and it was concluded that by assuming a uniform flow through the reach, the length unit should be obtained by applying Pe = 12. Moreover, by using temporal moment matching, explicit relationships for MDLC model parameters (k, n, and τ) and based on conventional advection-dispersion equation (ADE) parameters (D, u, x) were extracted. MDLC parameters of the field breakthrough curves were extracted, and it was found that the increase of Pe number caused an increase in delay time and the number of cascades. However, the residence time was obtained to be fixed. Additionally, by assuming the dispersivity parameter (D/u) is constant, the changes in the MDLC parameters were investigated by velocity variation, and new relationships were proposed to estimate the parameters under different hydraulic conditions. Using presented equations provided in this study for residence time (k), cascade number (n), and delay time (τ), the sensitivity analysis was performed, and it was found that the parameters of velocity (u), dispersion coefficient (D), and velocity (u) have the most important effect in calculation of them, respectively.

The Use Of Problem Solving Method To Improve The Result Of Mathematics Learning About Length Unit

<p>Penelitian ini yaitu untuk: untuk mengetahui penggunaan metode pemecahan masalah dapat meningkatkan hasil belajar Matematika tentang satuan panjang pada kelas II SD Negeri 5 Panjer Tahun Ajaran 2020/2021. Penelitian ini merupakan PTK yang direncanakan dan dilaksanakan oleh peneliti sendiri dalam dua siklus, setiap siklus terdiri dari perencanaan, pelaksanaan, observasi, dan refleksi. Pada siklus I pertemuan I dengan presentase siswa belum tuntas 30,00 % dan tuntas 70,00%. Siklus I pertemuan II yaitu dengan presentase siswa belum tuntas 15,00% dan tuntas 85%. Siklus II pertemuan I dengan presentase siswa belum tuntas 25,00% dan tuntas 75,00%. Pada siklus II pertemuan II tetap menggunakan metode pemecahan masalah meningkat dengan presentase siswa belum tuntas 10,00% dan tuntas 90,00%. Kesimpulan penelitian ini adalah penggunaan metode pemecahan masalah dapat meningkatkan hasil belajar matematika peserta didik tentang satuan panjang di kelas II SD Negeri 5 Panjer tahun ajaran 2020/2021.<em></em></p>

Structure of Cubic Al73.8Pd13.6Fe12.6 Phase with High Al Content

A cubic ternary phase Al73.8Pd13.6Fe12.6 (designated C′ phase), with very high Al content (Al/TM = 2.82, TM denotes transition metal) was prepared by spark plasma sintering (SPS). Its crystal structure was determined by combing single-crystal X-ray diffraction (SXRD) and scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) measurements. The crystal structure of the new phase can be described with a small unit cell (a = 7.6403(2) Å; space group Pm3, No. 200) as that of Al2.63Rh (a = 7.6692(1) Å; space group P23, No. 195) while different from those of the reported Al39Pd21Fe2 (a = 15.515(1) Å; space group Fm3, No. 202) and Al69Pd17Fe14 (a = 15.3982(2) Å; space group Im3, No. 204) compounds, which both adopt a double length unit cell in the Al–Pd–Fe system. The mechanism of distributing more Al atoms in the new phase was compared with that of the Al2.63Rh phase by analyzing their site symmetry and the corresponding site of occupancies (SOF). Furthermore, relations of the C′ phase to the reported Al69Pd17Fe14 (designated C1 phase) and Al39Pd21Fe2 (designated C2 phase) phases were investigated by analyzing their building units with the “nanocluster” method in the ToposPro package.

A Complex Networks Approach to Analysing the Erdős-Straus Conjecture and Related Problems

For any positive integer n &ge; 2, the Erdős-Straus Conjecture claims that the Diophantine equation 4/n = 1/x + 1/y + 1/z has a solution where x, y, z are also positive integers. In this paper, a directed network based on this equation is generated, with properties such as its average clustering coefficient, average path length, degree distributions, and largest strongly connected component analysed to reveal some underlying trends about the nature of the conjecture. Potential connections between different numbers, that result from satisfying a source-solution relationship for this equation, are described using the appropriate number-theoretic interpretations wherever possible, while conjectures backed by these trends are made in other instances. Additionally, a directed configuration model is used to show that the origin of several results is the degree sequence of the network. Metrics relating to the prime number nodes, specifically their in and out degrees, are also explored to yield some intriguing observations. On the whole, the aim is to highlight the viability of complex networks as a computational tool to study this general class of problems pertaining to fixed-length unit fraction splits.