bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analisis Kapasitas dan Kinerja Simpang Bersinyal Pada Simpang Abdullah Dg. Sirua
Authors: Hasanuddin Hairil A , Halim Hasmar , Hanafie Isnaeni Maulidiyah , . Trisnawathy 
Published: December 2022

Meningkatnya jumlah penduduk di Kota Makassar menyebabkan meningkatnya juga pertumbuhan kendaraan pribadi. Pertumbuhan kendaraan pribadi yang tinggi bisa menyebabkan kemacetan salah satunya di Simpang Jalan Abdullah Dg. Sirua yang sering terjadi tundaan kendaraan pada jam sibuk. Kawasan ini termasuk dalam kawasan yang padat karena merupakan kawasan pusat perdagangan, perkantoran, dan pendidikan. Tujuan penelitian ini adalah untuk menganalisis kinerja tingkat pelayanan persimpangan Jalan Abdullah Dg. Sirua melalui evaluasi kinerja simpang bersinyal berdasarkan analisis waktu sinyal, kapasitas, derajat kejenuhan dan tingkat pelayanan simpang dengan menggunakan metode MKJI 1997. Berdasarkan hasil analisis yang dilakukan diperoleh tingkat pelayanan simpang berada pada level D. yaitu arus lalu lintas (arus stabil tetapi kecepatan dibatasi) yaitu Derajat Kejenuhan untuk Pendekat Barat, Selatan, Timur dan Utara sebesar 0,82, 0,54, 0,70 dan 0,8. Hal ini menandakan bahwa simpang bersinyal masuk dalam kategori kondisi arus mendekati tidak stabil diatas angka 0,75
Korelasi Koefisien Umur Terhadap Kuat Tekan Beton Yang Menggunakan Semen PCC (Portland Composite Cement)
Authors: Ibrahim Ashari 
Published: December 2022

Korelasi umur terhadap kuat tekan beton yang digunakan sampai saat ini adalah yang dikeluarkan oleh Peraturan Beton Indonesia (PBI 71) dengan menggunakan jenis semen OPC tipe I yaitu : 3 hari = 0,46, 7 hari = 0,65, 14 hari = 0,88, 21 hari = 0,95, 28 hari = 1,00 dan 92 hari = 1,18. Masalah utama yang terjadi di laboratorium maupun di lapangan adalah: nilai koefisien umur semen OPC tipe I digunakan juga terhadap beton yang menggunakan jenis semen PCC . Penelitian ini bertujuan untuk mendapatkan hubungan umur dan kuat tekan beton dengan menggunakan semen PCC (Portland Composite Cement) berupa koefsien umur beton untuk dikonversi ke 28 hari. Pengambilan data diawali dengan uji karakteristik agregat (pasir dan kerikil), mix design beton dengan menetapkan salah satu mutu beton yang umum diterapkan pada dunia konstruksi/diproyek yaitu kuat tekan karakteristik 225 kg/cm2. Selanjutnya membuat benda uji kubus (15 x 15 x 15) cm dengan menggunakan semen PCC, kemudian dilakukan perawatan benda uji dan pengujian kuat tekan pada umur 3, 7, 14, 21, 28, 60 dan 92 hari. Kuat tekan yang dihasilkan dari tiap – tiap umur beton dibandingkan terhadap kuat tekan beton 28 hari sehingga diketahui korelasi antara umur dan kuat tekan dapat diketahui. Dari hasil penelitian diperoleh koefisien umur beton yang berpedoman pada nilai kuat tekan rata - rata masing – masing umur beton, dengan menggunakan semen PCC PT Semen Tonasa memberikan hasil berturut – turut : umur 3 hari = 0,45, 14 hari = 0,84, 28 hari = 1,0, 60 hari = 1,12 dan 92 hari = 1,22. Demikian halnya dengan beton menggunakan Semen PCC PT Semen Bosowa memberikan hasil : umur 3 hari = 0,47, 14 hari = 0,79, 28 hari = 1,0, 60 hari = 1,06 dan 90 hari = 1,20. Kedua jenis semen PCC tersebut menghasilkan nilai koefisien umur beton yang relative sama.
SCHEME OF MULTIPLICATIVE REPRESENTATIONS FOR A STOCHASTIC EQUATION WITH TWO WIENER PROCESSES
Authors: Nagolkina Zoya , Filonov Yuri 
Published: December 2022

In this paper we consider a stochastic differential equation with two independent Wiener processes in an infinite-dimensional Hilbert space. This equation can be a mathematical model of a dynamic system in the presence of several independent perturbing random factors. To study the parameters of this equation, the Daletsky-Trotter method of multiplicative representations is used. This method is applied to both deterministic and stochastic equations. The method consists in the following: one constructs a partition of the interval of existence of the solution [t0, T] into elementary [tk+1, tk]. On each elementary segment, the evolutionary resolving operator of the complete equation S(tk+1, tk) is considered, as well as the product of the resolving operators of equations that are fragments of the complete equation =Q1k×S1k×S2k
Thus, two multiplicative families consisting of different resolving operators are compared. When the equivalence conditions, which are verified in this paper, are satisfied, it can be argued that the solution of a stochastic equation can, in a certain sense, be represented as a composition of the corresponding solutions of differential equations on elementary intervals, the right parts of which are drift, and, accordingly, diffusion.
Moreover, in order to implement such a multiplicative scheme in the case of several independent Wiener processes, additional requirements regarding diffusion coefficients should be imposed. Namely: the diffusion coefficients must be commuting operators, continuous in time.
The scheme of multiplicative representations is based on the study of the parameters of evolutionary families of decision operators, as well as their estimates in the norms of the corresponding spaces. In this case, to obtain a certain estimate, several iteration steps are considered for the corresponding equations in the Hilbert space. It should be noted that the scheme of multiplicative representations can be interpreted as a scheme for obtaining an approximate solution.
PARQUETS FROM REGULAR FIVE-POINTED AND TEN-POINTED STARS
Authors: Nitsyn Alexander 
Published: December 2022

Obviously, regular pentagons cannot fill a plane without overlaps and gaps. However, the plane can be filled without overlaps and gaps with polygons whose angles are multiples of 36°. For example, if a regular pentagon is changed into a regular five-pointed star, composed of five rhombuses with angles of 72° and 108°, and supplemented with five rhombuses with angles of 36° and 144° to form a regular decagon, then the resulting rhombuses can fill the plane without overlaps and gaps.
It is assumed that, in addition to the presented method of tiling the plane with the rhombuses pointed out above, there are other ways of tiling the plane without overlaps and gaps with polygons whose angles are multiples of 36°. This explains why the challenge of tiling a plane with regular pentagons attracts the attention of not only geometers, but also designers who create new types of ornaments. Moreover, the regular pentagon among other types of regular polygons has the highest aesthetic qualities, and parquets made up of polygons, the angles of which are multiples of 36°, surpass other types of parquet in beauty and perfection. Therefore, the working out of methods for tiling a plane without overlaps and gaps with polygons, the angles of which are multiples of 36°, is an actual challenge for both geometers and designers creating new types of ornaments.
For the first time, two variants of the parquet, composed of rhombuses forming five-pointed and ten-pointed stars, were worked out. If in the first variant the center of the parquet is a five-pointed star, then in the second variant it is a ten-pointed star. Moreover, if in the first variant the parquet does not have a single plane of symmetry, then in the second variant the parquet has twenty planes of symmetry. Another difference is that if in the first variant the parquet has a rotational symmetry with a 5th order symmetry axis, then in the second variant it has a rotational symmetry with a 10th order symmetry axis. Common to both variants of parquet is that they belong to non-periodic parquets, that is, they are new, previously unexplored types of Penrose mosaics. It is assumed that our further research will be directed to the invention of parquet, which has neither translation nor rotation symmetry, and at the same time maintains order in the arrangement of tiles.
ROLLING OF A DEVELOPABLE HELICOID OF THE SCREW LINE ALONG ITS BENDING
Authors: Pylypaka Serhiy , Kresan Тetiana , Hropost Vyacheslav , Babka Vitaliy 
Published: December 2022

A very common helical surface in various mechanisms is a straight closed helicoid or screw conoid, known in the technical field as a screw. Considering the wide application of screws, there are various methods of their production (winding, rolling, stamping, stretching flat rings welded together on a shaft). Since the surface of the screw conoid is nondevelopable, the flat ring is an approximate sweep of the screw, since an exact sweep does not exist. During the formation of the turn of a screw conoid from a flat ring, plastic deformations occur in it, caused by the transformation of a developable surface into a nondevelopable one.
It is known from differential geometry that any screw surface can be bent into a surface of revolution. For a screw conoid, such surface is a catenoid. The paper presents parametric equations for the continuous bending of a catenoid into a screw conoid. It is proposed to replace the compartment of the catenoid, which corresponds to the given compartment of one turn of the conoid, with a truncated cone. The sweep of this cone in the form of a flat ring can be considered a blank for forming the surface of a conoid. A comparative analysis of the sizes of the ring obtained by the proposed method with the sizes that can be obtained according to the formulas of the reference literature were made. Although there are differences, but they are practically insignificant.
As a result of the study of the continuous bending of a catenoid into a screw conoid, an improvement of the process of such bending is proposed. In one of the existing methods of forming a screw from flat rings, several rings in the form of a sector are proposed to be welded together and then stretched to obtain a screw with the same number of turns. Welded rings are put on the shaft, one end is fixed to it (for example, by welding), and the other is stretched to the desired size. With this method, the twisting of the workpiece around the axis of the shaft is not taken into account. It is necessary to bend truncated cones from separate sectors, weld them together, and only then stretch them. In this case, the twist angle is already embedded in the workpiece in the form of welded cones.
COMPUTER MODELING AS A METHOD AND MEANS OF IMPROVING CONSTRUCTION MACHINES
Authors: Ragulin Vitaliy , Yaryzhko Oleksandr , Nazarko Olga 
Published: December 2022

The task of improving the educational process, improving the quality of education in the field of engineering and the effective use of technical methods and tools in the design and modernization of construction equipment using computer software is the most pressing modern task.
The emphasis in education, which is transferred to the independent work of the student without changing the approaches and methods of teaching disciplines, and even more so specialized subjects, has a negative impact on the quality of the future specialist. Especially in such a difficult time, when you have to completely switch to distance learning, it is extremely necessary to change the approach to learning, especially in senior courses.
The creation of complex complexes and machines is accompanied by a significant number of intermediate tasks. The use of the whole complex of construction equipment is mainly used in various technological operations and with the use of various replaceable work equipment.
Modern pace of road construction dictates high requirements for modern technology, one of the important parameters of which is the utilization rate of the machine over time. When performing technological operations, the load from the ground is transmitted through the main working body to all elements of the suspension mechanism of the working equipment.
The use of software allows you to preview any activity during the simulation allows you to check for security, reduce costs, and sometimes find new ways to implement, without conducting expensive tests. To do this, it is necessary to pre-model the node, unit, module, which will interact in a complex system.
The use of modeling will assess the appearance of the finished product and its structural elements. At the moment, the development of objects of any kind cannot but be accompanied by the creation of a 3D model. This process will allow you to analyze the accuracy of all components that will interact when installed on a designed or existing machine.
Energy-saving technology for processing of exhausted etching solutions with obtaining of ferromagnetic compounds
Authors: Samchenko Dmitry N. , Kochetov Gennadii М. , Vasiliev Aleksey , Derecha Dmitry A. , Skirta Yurii B. , Lastivka Oles V. 
Published: December 2022

Exhausted etching solutions are the waste of industrial enterprises and contain toxic pollutants that have a detrimental effect on the environment. Currently, the processing of these solutions to obtain marketable products is important. The paper presents the results of research on the application of the ferritization method for processing of exhausted etching solutions of steel surfaces. Energy-saving activation of the process by alternating magnetic fields was used, which has undeniable advantages compared to traditional thermal activation. The influence of the initial concentration of iron ions in the reaction mixture of ferritization process and the methods of its activation on the treatment quality of exhausted etching solutions was studied. It was established that the best degree of extraction of heavy metal ions from exhausted etching solutions by ferritization is achieved when the reaction mixture is activated by alternating magnetic fields at an initial concentration of iron ions of 6.6 g/dm3 . At the same time, the residual concentration of iron ions in purified solutions does not exceed 0.03 mg/dm3 , that corresponds to degree of purification of solutions of 99.999%. Those solutions can be reused in situ. The qualitative and quantitative composition of ferritization sediments was studied. Phases of ferroxygite δ-FeOОН, magnetite Fe3O4 and maghemite ɣ-Fe2O3 were detected by X-ray phase analysis in the sediments. It was established that at the initial concentration of iron ions of 26.6 g/dm3 with thermal activation of the reaction mixture and 16.6 g/dm3 with alternating magnetic fields activation, the sediment exclusively contains the magnetite phase. The results of the study indicate the possibility of further use of sediments for the production of important industrial products and materials containing ferromagnetic compounds. The implamitation of improved ferritization process in industrial enterprises will allow to achieve decrease of energy consumption compared to known technologies of exhausted etching solutions processing.
Modeling and calculations of parameters of the joint treatment of organic contaminations (OC) and nitrogen (N) compounds in bioreactors with using of the fixed biocenosis (biofilm)
Authors: Oliynyk Oleksandr Ya. , Telyma Sergiy V. , Kalugin Yuriy I. , Oliynyk Yevheniy O. 
Published: December 2022

The mathematical models and the parameter calculations of the simultaneous waste water treatment from the organic contaminants and ammonium nitrogen compounds in the bioreactors-aerotanks with additional fixed biocenosis as a biofilm in their volume are proposed. The questions connected with heterogeneous structure of biofilm from different bacteria and the substantiation of the balance equations system with kinetic reactions for following their realization which are describing of the simultaneous removing organic contaminations (OC) and nitrogen (N) in biofilm taking into account on the oxygen regime O2 are considered. Detailed analysis of aerotank operation with additional fixed biocenosis shown about the possibility of creation of the new conditions for simultaneous removing of the OC and nitrogen by the suspended and fixed biocenosis. At the same time the arrangement of the aerotank-mixture from the three sections where the simultaneous treatment have a place is recommended taking into account on the theoretical substantiation of these sections in one reactor. It is shown that on the different loads the complex heterogeneous structure of the biofilm is formed which consist of from different bacteria. So near the biofilm surface it consists of the heterotrophs during the removing of OC and at during of removing of nitrogen from the autotrophs. At the same time more active heterotrophs may to grow as in anaerobic as in anoxic conditions and the processes that have a place in the biofilm at the simultaneous treatment are connected with the growing of the competition between the heterotrophs and autotrophs in the fight to oxygen. Heterotrophy that are situated are near surface of the biofilm are using of more oxygen than autotrophy that are in the lower part of one. As a result of realization of the created models taking into account on the influence of the different factors on the simultaneous waste water treatment from OC and N processes the recommendations to parameter calculations are proposed. Besides of the boundary conditions of necessary bacteria presence at which the simultaneous removing of the OC and N are occurred and at which conditions some of substrates will limit the waste water treatment processes are determined.
Calculation methods of a combined resourcesaving system of manure removal on pig-rearing complexes
Authors: Briukhanov A. Yu. , Shalavina E. V. , Vasilev E. V. 
Published: December 2022

Relevance. The use of liquid fraction of pig manure as technical water for manure removal is a resourcesaving solution. Applying this solution in designing combined resource-saving manure removal systems requires calculation and accounting methods for the manure nutrients and suspended matter, which pass into the solid and liquid fractions during manure separation. The study aimed to develop a methodology for calculating the quantity and quality of manure fractions for the case when a part of the liquid fraction would be used in the manure removal system.Methods. Calculations were based on the data from a pig rearing complex located in the Leningrad region, with 65,100 heads on the complex at any one time. The calculation results were compared with the actual values from the protocols of laboratory analyses.Results. The developed methodology will allow the farm to make a more efficient accounting plan for nutrients passing into organic fertilisers. It will also save up to 47 450 tons of clean water for the manure removal system per year.
Klasifikasi Sentimen Terhadap Maxim Menggunakan Algoritma SVM Pada Media Sosial Twitter
Authors: Pranata Anggi , Budianita Elvia , Yusra Yusra , Cynthia Eka Pandu 
Published: December 2022

Abstrak - Twitter merupakan media sosial yang penggunanya paling pesat. Seiring perkembangan waktu, setiap ojek online memiliki popularitas di masing-masing user. Contoh saja Maxim, pendatang baru yang menyediakan layanan yang berbeda dengan ojek lain. Salah satu aktivitas yang biasa dilakukan para fans atau haters kepada akun twitter ojek online yaitu memberikan komentar pada tweet, untuk mengetahui komentar para fans dan haters diperlukan klasifikasi dengan menggunakan machine learning. Pada penelitian ini, langkah pertama adalah dilakukan proses sortir dan pemberian label pada data tersebut. Hasilnya akan tercipta 3 label yaitu label data positif, netral dan label data negatif dengan jumlah 1200 data. Selanjutnya melakukan analisa preprocessing data yang meliputi case folding, cleansing data, tokenizing, filtering dan stemming. Lalu dilakukan pembobotan dengan metode TF-IDF dan diklasifikasikan dengan metode Support Vector Machine. Hasil pengujian dilakukan dengan metode Confussion Matrix, berdasarkan hasil pengujian diperoleh akurasi terbaik pada perbandingan data 90:10 sebesar 85% dengan menggunakan Kernel RBF dan Polynomial, dilanjutkan dengan kernel Sigmoid sebesar 82,5% dimana hasil klasifikasi didominasi kalimat positif.Kata kunci: analisis sentiment, klasifikasi, ojek online, support vector machine, twitter Abstract - Twitter is one of the Social Medias which has a rapid user. Over the time, every Ojek Online, has its own popularity among their users. Maxim, for instance, a newcomer which provides a different service from other online motorcycle taxies. One of the activities which is always do by the fans or haters toward twitter account of online motorcycle taxies is giving comments on tweet. To identify the comments from fans or haters is required classification by using Machine Learning. In this research, the first step was sorting process and labelling the data. As the result 3 labels would have created, which were positive data label, neutral data label, and negative data label with total of 1200 data. The next step was conducting the analysis of preprocessing data which included case folding, data cleansing, tokenizing, filtering and stemming. Then, the weighting was carried out using the TF-IDF method and classified by the Support Vector Machine method. The test results were carried out using the Confusion Matrix method, based on the test results, the best accuracy was obtained at a data comparison of 90:10 by 85% using the RBF Kernel and Polynomial, followed by the Sigmoid kernel of 82.5% where the classification results were dominated by positive sentences.Key word: classification, Ojek Online, sentiment analysis, support vector machine, twitter