bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS PENGARUH PENGGUNAAN SISTEM INFORMASI AKADEMIK (SIA) ONLINE TERHADAP KEPUASAN MAHASISWA
Authors: Ratna Silvia
Published: August 2019

Sistem Informasi akademik Online merupakan layanan yang diberikan kepada mahasiswa untuk memudahkan dalam bertransaksi akademik, dengan adanya sistem informasi akademik mahasiswa dapat melaksanakan transaksi akademik dimanapun  berada dengan syarat terhubung dengan internet. Banyaknya pelayanan SIA yang bisa diberikan berdampak pada kepuasan mahasiswa.  . Penelitian ini bertujuan (1) Untuk mengetahui pelayanan akademik apa saja yang di berikan dengan menggunakan Sistem Informasi Akademik Online (SIAO) yang sudah diberlakukan di Universitas islam Kalimantan (2) Untuk mengetahui tingkat kepuasan mahasiswa dengan diberlakukannya Sistem Informasi Akademik (3) Untuk mengetahui pengaruh penggunaan Sistem Informasi Akademik Online (SIAO) terhadap Mahasiswa(4) Dapat memberikan masukan-masukan dan langkah-langkah strategis berkenaan dengan diberlakukannya Sistem Informasi Akademik Online di Universitas. Total populasi dalam penelitian ini adalah 100 mahasiswa Fakultas Teknologi Informasi Populasi penelitian ini adalah 100 mahasiswa pengguna sistem informasi akademik online di Fakultas Teknologi Informasi universitas islam kalimantan Teknik analisis data menggunakan analisis statistik deskripstif dan statistik inferensial yang menggunakan Smart PLS . Kata Kunci : Sia Online, Kepuasan, pengguna
SISTEM PENUNJANG KEPUTUSAN PEMILIHAN VARIETAS JAGUNG BERDASARKAN KESESUAIAN LAHAN DENGAN METODE PROFILE MATCHING
Authors: Zaenuddin Zaenuddin , Kurniawan Mirza Yogy
Published: August 2019

Produksi jagung dalam negeri masih bisa meningkat melalui perluasan areal tanam jagung utamanya di luar daerah jawa. Namun produktivitas meningkat, namun rata - rata produktivitas jagung nasional masih belum maksimal. Padahal teknologi produksi jagung semakin canggih.Potensi jagung di daerah Kalimantan selatan khususnya  Kabupaten Tanah Laut terbilang sangat besar namun varietas yang ditanam belum sesuai dengan spesifikasi lahan yang dimiliki. Profile matching dapat memberikan rekomendasi berdasarkan variabel kesesuaian lahan dengan varietas.Sistem penunjang keputusan yang dihasilkan telah memiliki fitur yang dibutuhkan untuk merekomendasikan varietas jagung yang sesuai dengan lahan yang akan ditanami. Kata Kunci : kesesuaian lahan, profile matching, sistem penunjang keputusan
RANCANG BANGUN SISTEM INFORMASI PERPUSTAKAAN BERBASIS WEBSITE PADA SMPN 1 KERTAK HANYAR
Authors: Pratama Sefto , Putra Erfan Karyadi
Published: August 2019

Penggunaan teknologi komputer pada perpustakaan di SMPN 1 Kertak Hanyar saat ini hanya masih sebatas  pendataan anggota perpustakaan, dan data buku saja itupun hanya sebatas koleksi buku tertentu di Aplikasi Microsoft Excel, untuk data peminjaman buku, pengembalian buku, denda dan ketidak akuratannya informasi tentang koleksi buku, membuat penempatan buku pada rak yang tersedia menjadi tidak teratur karena tidak adanya informasi yang mengatur tentang penempatan buku dengan baik, karena saat ini sistem yang berjalan adalah dilakukan secara manual. Oleh karena itu maka diperlukan sebuah sistem informasi yang dapat mengelola data koleksi buku, data anggota perpustakaan, data peminjaman buku, data pengembalian buku dan data denda bagi anggota yang terlambat mengembalikan buku, yang bertujuan untuk meningkatkan kinerja pengelola perpustakaan agar lebih efektif dalam mengelola data pepustakaan, dan juga agar menambah minat baca para anggota perpustakaan yaitu para siswa SMPN 1 Kertak Hanyar itu sendiri. Hasil dari implementasi sistem informasi perpustakaan ini dapat diakses oleh 3 user yaitu anggota perpustakaan, pustakawan dan kepala perpustakaan. Keywords: Sistem Informasi, Perpustakaan, Berbasis WebsitePenggunaan teknologi komputer pada perpustakaan di SMPN 1 Kertak Hanyar saat ini hanya masih sebatas  pendataan anggota perpustakaan, dan data buku saja itupun hanya sebatas koleksi buku tertentu di Aplikasi Microsoft Excel, untuk data peminjaman buku, pengembalian buku, denda dan ketidak akuratannya informasi tentang koleksi buku, membuat penempatan buku pada rak yang tersedia menjadi tidak teratur karena tidak adanya informasi yang mengatur tentang penempatan buku dengan baik, karena saat ini sistem yang berjalan adalah dilakukan secara manual. Oleh karena itu maka diperlukan sebuah sistem informasi yang dapat mengelola data koleksi buku, data anggota perpustakaan, data peminjaman buku, data pengembalian buku dan data denda bagi anggota yang terlambat mengembalikan buku, yang bertujuan untuk meningkatkan kinerja pengelola perpustakaan agar lebih efektif dalam mengelola data pepustakaan, dan juga agar menambah minat baca para anggota perpustakaan yaitu para siswa SMPN 1 Kertak Hanyar itu sendiri. Hasil dari implementasi sistem informasi perpustakaan ini dapat diakses oleh 3 user yaitu anggota perpustakaan, pustakawan dan kepala perpustakaan. Keywords: Sistem Informasi, Perpustakaan, Berbasis Website
PERANCANGAN SISTEM INFORMASI INVENTARIS LABORATORIUM KOMPUTER PADA SMK NEGERI 2 BANJARMASIN MENGGUNAKAN DELPHI 7.0
Authors: Yuridka Fitrah , Wathani Muhammad Rais
Published: August 2019

Pada SMK Negeri 2 Banjarmasin pendataan untuk Sistem informasi Inventaris barang computer masih bersifat manual sehingga dalam pengarsipan data ini masih tidak tersusun rapi, hal ini sangat memberikan dampak bagi pihak sekolah terutama apabila ada audit system serta pelaporan data-data mengenai inventaris laboratorium, Dimana pada SMK Negeri 2 terdiri dari laboratorium perakitan PC dan Laptop, Laboratorium Pemrograman dan Jaringan, Laboratorium RPL, Dan Laboratorium Multimedia. Mengingat Jumlah Laboratorium yang cukup banyak maka Perancangan system informasi serta pembuatan aplikasi Delphi 7.0 sangat diperlukan untuk membantu pengarsipan data pada inventaris laboratorium Komputer pada SMK Negeri 2 yang digunakan ketua laboratorium dalam pelaporan Inventaris di sekolah salah satu contoh laporan barang yang bersifat computer maupun non computer serta laporan jika terdapat mutasi barang dari satu laboratorium ke laboratorium lainnya dan laporan peminjaman barang laboratorium. Kata Kunci :InventarisLaboratoriumKomputer, SMK Negeri 2 Banjarmasin, Delphi 7.0
Presence of Propionibacterium acnes in patients with aseptic bone graft resorption after cranioplasty: preliminary evidence for low-grade infection
Authors: Butenschoen Vicki M. , Seifert Mirja , Meyer Bernhard , Krieg Sandro M.
Published: August 2019

OBJECTIVE

Autologous bone graft reimplantation remains the standard treatment after decompressive hemicraniectomy. Unfortunately, some patients present with signs of bone resorption without any visible signs of infection; the reasons remain unknown. Contamination with Propionibacterium acnes has been discussed as a potential source of the osteolytic process. The aim of this study was to investigate the microbial spectrum detected in samples of grafts from patients with aseptic bone resorption and compare them to septic bone graft infections in order to identify P. acnes as the specific pathogen of aseptic bone resorption.

METHODS

The authors retrospectively reviewed all patients treated for aseptic bone resorption between 2012 and 2017 in their neurosurgical department. Septic infections were used as a control group to gain information on the present bacterial spectrum. Perioperative data such as demographics, number of surgeries, and complications were assessed and compared with the microbiological analyses conducted in order to detect differences and potential sources for aseptic bone resorption and possible differences in bacterial contamination in septic and aseptic bone infection.

RESULTS

In total, 38 patients underwent surgery between 2012 and 2017 for septic bone infection—14 for aseptic bone resorption. In 100% of the septic bone infection cases in which bone flap removal was needed, bacteria could be isolated from the removed bone flap (55% Staphylococcus aureus, 13.2% Enterococcus faecalis, and 18.4% Staphylococcus epidermidis). The microbial spectrum from samples of aseptic bone flaps with resorption was examined in 10 of 14 patients and revealed contamination with P. acnes in 40% (n = 4, the other 6 bone grafts were sterile), especially in sonication analysis, whereas visible septic bone infection was mainly caused by S. aureus without detection of P. acnes.

CONCLUSIONS

Aseptic bone resorption may be caused by low-grade infections with P. acnes. However, further analysis needs to be conducted in order to understand its clinical relevance and treatment perspective.
The impact of preradiosurgery embolization on intracranial arteriovenous malformations: a matched cohort analysis based on de novo lesion volume
Authors: Hung Yi-Chieh , Mohammed Nasser , Eluvathingal Muttikkal Thomas Jose , Kearns Kathryn N. , Li Chelsea Eileen , Narayan Aditya , Schlesinger David , Xu Zhiyuan , Sheehan Jason P.
Published: August 2019

OBJECTIVE

The benefits and risks of pre–stereotactic radiosurgery (SRS) embolization have been reported in different studies. The goal of this study was to compare the long-term outcome of arteriovenous malformations (AVMs) treated with and without pre-SRS embolization.

METHODS

A database including 1159 patients with AVMs who underwent SRS was reviewed. The embolized group was selected by including AVMs with pre-SRS embolization, maximal diameter > 30 mm, and estimated volume > 8 ml. The nonembolized group was defined as AVMs treated by SRS alone with matched de novo nidus volume. Outcomes including incidences of favorable clinical outcome (obliteration without hemorrhage, cyst formation, worsening, or new seizures), obliteration, adverse effects, and angioarchitectural complexity were evaluated.

RESULTS

The study cohort comprised 17 patients in the embolized group (median AVM volume 17.0 ml) and 35 patients in the nonembolized group (median AVM volume 13.1 ml). The rates of obliteration (embolized cohort: 33%, 44%, and 56%; nonembolized cohort: 32%, 47%, and 47% at 4, 6, and 10 years, respectively) and favorable outcome were comparable between the 2 groups. However, the embolized group had a significantly higher incidence of repeat SRS (41% vs 23%, p = 0.012) and total procedures (median number of procedures 4 vs 1, p < 0.001), even with a significantly higher margin dose delivered at the first SRS (23 Gy vs 17 Gy, p < 0.001). The median angioarchitectural complexity score was reduced from 7 to 5 after embolization. Collateral flow and neovascularization were more frequently observed in the embolized nonobliterated AVMs.

CONCLUSIONS

Both embolization plus SRS and SRS alone were effective therapies for moderately large (8–39 ml) AVMs. Even with a significantly higher prescription dose at the time of initial SRS, the embolized group still required more procedures to reach final obliteration. The presence of collateral flow and neovascularization could be risk factors for a failure to obliterate following treatment.
Subdural versus subgaleal drainage for chronic subdural hematomas: a post hoc analysis of the TOSCAN trial
Authors: Häni Levin , Vulcu Sonja , Branca Mattia , Fung Christian , Z’Graggen Werner Josef , Murek Michael , Raabe Andreas , Beck Jürgen , Schucht Philippe
Published: August 2019

OBJECTIVE

The use of subdural drains after surgical evacuation of chronic subdural hematoma (CSH) decreases the risk of recurrence and has become the standard of care. Halfway through the controlled, randomized TOSCAN (Randomized Trial of Follow-up CT after Evacuation of Chronic Subdural Hematoma) trial, the authors’ institutional guidelines changed to recommend subgaleal instead of subdural drainage. The authors report a post hoc analysis on the influence of drain location in patients participating in the TOSCAN trial.

METHODS

The study involved 361 patients enrolled in the TOSCAN trial. The patients were stratified according to whether they received surgery before (cohort A) or after (cohort B) the change in institutional protocol. An intention-to-treat analysis was performed with surgery for recurrence as the primary endpoint. Secondary endpoints were outcome-based on modified Rankin Scale scores, seizures, infections, parenchymal brain injuries, and hematoma diameter.

RESULTS

Of the 361 patients included in the analysis, 214 were stratified into cohort A (subdural drainage recommended), while 147 were stratified into cohort B (subgaleal drainage recommended). There was a 31.78% rate of crossover from the subdural to the subgaleal drainage insertion site due to technical or anatomical difficulties. No differences in the rates of reoperation (21.5% [cohort A] vs 25.17% [cohort B], OR 0.81, 95% CI 0.50–1.34, p = 0.415), infections (0.47% [cohort A] vs 2.04% [cohort B], OR 0.23, 95% CI 0.02–2.19, p = 0.199), seizures (3.27% [cohort A] vs 2.72% [cohort B], OR 1.21, 95% CI 0.35–4.21, p = 0.765), or favorable outcomes (modified Rankin Scale score 0–3) at 1 and 6 months (91.26% [cohort A] vs 96.43% [cohort B], OR 0.39, 95% CI 0.14–1.07, p = 0.067; 89.90% [cohort A] vs 91.55% [cohort B], OR 0.82, 95% CI 0.39–1.73, p = 0.605) were noted between the two cohorts. Postoperatively, patients in cohort A had more frequent parenchymal brain tissue injuries (2.8% vs 0%, p = 0.041). Postoperative absolute and relative hematoma reduction was similar irrespective of the location of the drain.

CONCLUSIONS

Subgaleal rather than subdural placement of the drain did not increase the risk for reoperation for recurrence of CSHs, nor did it have a negative impact on clinical or radiological outcome. The intention to place a subdural drain was associated with a higher rate of parenchymal injuries.
Canine Masticator Myositis in a Rottweiler Breed Dog
Authors: KARAN Bahadır , KARABAĞLI Murat , ÖZER Kürşat
Published: August 2019

Canine
masticator muscle myositis is an autoimmune disease which reasons are unclear.
This muscle myositis generally seen in big dog breeds. General symptoms are
pain and atrophy in the chewing muscle group, difficulty in opening jaw and
weight loss. Our case was 2 years old, castrated male, rottweiler breed dog
which was brought to our clinic with the complaints of face swelling and
difficulty in chewing in 2 weeks. Complete blood count and serum biochemistry
was carried out and eosinophilia was determined. We have used computed
tomography to detect structural changes in masticatory muscles and diagnosed
masticatory muscle myositis according to CT and laboratory test results.
Cortisone treatment was started with out loosing any time and also laser
therapy was added to the classical treatment to reduce pain. In the following
days, because of the difficulty of the feeding and severe losing in body weight
like reasons, euthanesia was recommended.
Tıbbi sülük (Hirudo verbana)’den izole edilen Aeromonas spp. suşlarının antibiyotik duyarlılıklarının belirlenmesi ve Çoklu Antibiyotik Direnç (ÇAD) indeks sonuçları
Authors: KORUN Jale , ULUTAŞ Aycan , GÖKOĞLU Mehmet
Published: August 2019

Bu
çalışmanın amacı tıbbi sülük (Hirudo
verbana)’den izole edilen hareketli Aeromonas
suşlarının antimikrobiyal duyarlılıklarını, Çoklu Antibiyotik Direnç (ÇAD)
indekslerini ve plazmitlerin varlığını araştırmaktır. Suşların antibiyotik
duyarlılıkları (ampisilin, kanamisin, kloramfenikol, nalidiksik asit,
streptomisin, tetrasiklin, trimetoprim ve trimetoprim+sülfametoksazol) standart
disk difüzyon tekniği ile belirlenmiştir. Plazmit izolasyonu manuel olarak
tespit edilmiştir. Suşların Çoklu Antibiyotik Direnç (ÇAD) indeksleri
hesaplanmıştır. Çalışma sonuçlarına göre, suşların en az bir antibiyotiğe karşı
dirençli olduğu tespit edilmiştir. İzole edilen suşlar plazmit içermiştir.
Karakteristik Daging Burger yang Diproduksi Menggunakan Tepung Sorgum, Tepung Talas dan Tepung Sukun
Authors: Rahmadanisa Rahmadanisa , Putra Aronal Arief , Novia Deni
Published: August 2019

Aplikasi penggunaan lima persen bahan pengikat bebas gluten pada pembuatan daging burger telah dilakukan. Tepung sorgum, tepung talas, dan tepung sukun telah digunakan pada formulasi daging burger sebagai representasi tepung bebas gluten dan dibandingkan dengan burger dengan bahan pengikat tepung terigu sebagai kontrol (tepung yang mengandung gluten). Kadar air, susut masak, penyusutan diameter, kekerasan, dan profil sensori (warna, aroma, rasa, tekstur, dan penerinaan keseluruhan) telah dievaluasi. Hasil dari penelitian ini menunjukkan bahwa tidak ada perbedaan yang nyata pada kadar air, susut masak, penyusutan diameter, dan kekerasan sampel. Daging burger menggunakan tepung sukun memiliki daya terima yang lebih rendah dibanding perlakuan lainnya (P<0.05), dimana daya terima burger menggunakan tepung sorgum dan tepung talas setara dengan burger menggunakan tepung terigu (P>0.05). Dari penelitian ini disimpulkan bahwa tepung sorgung dan tepung talas dapat menjadi sumber bahan pengikat alternatif pada pembuatan burger yang umumnya menggunakan tepung yang mengandung gluten.
Dampak Desentralisasi Fiskal Terhadap Pembangunan Sektor Peternakan Provinsi Sumatera Utara Menggunakan Pendekatan Sistem Neraca Sosial Ekonomi
Authors: Harahap Muhammad Syafril , Siregar Hermanto , Erlina Erlina , Rahmanta Rahmanta
Published: August 2019

Pembangunan Sektor peternakan di Sumatera Utara tidak terlepas dari peran pemerintah daerah mulai dari perencanaan dan pembiayan yang berasal dari Anggaran Belanja Daerah (APBD). Untuk itu perlu diketahui dampak dari pengeluaran pemerintah daerah dalam pembangunan peternakan di Sumatera Utara. Penelitian ini dilakukan pada tahun 2014, di Provinsi Sumatera Utara, dengan menggunakan pendekatan Sistem Neraca Sosial Ekonomi (Social Accounting Matriks) dan sekaligus dilakukan simulasi pengeluaran anggaran Pemerintah Provinsi Sumatera Utara pada sektor peternakan, dengan menggunakan data pegeluaran Pemerintah Provinsi Sumatera Utara tahun 2014, dan data lainnya yang berkaitan dengan penelitian. Dampak injeksi Rp. 1 Milyar pengeluaran pemerintah pada sektor peternakan akan meningkatkan output pada sektor peternakan Rp 2,8954 Milyar, pendapatan rumah tangga sebesar Rp 0,3403 Milyar, pendapatan faktor produksi modal Rp 0,3608 milyar dan tenaga kerja pertanian Rp 0,2154 milyar. Jumlah pendapatan sektor pertanian (termasuk peternakan) pada tahun 2014 di Provinsi Sumatera Utara sebesar Rp. 22.563.848 /jiwa, dengan jumlah pekerja sebesar 2.556.044 jiwa atau 43% dari total tenaga kerja.
ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ КОНДИЦІЮВАННЯ ЗОВНІШНЬОГО ПОВІТРЯ СИСТЕМИ КОМБІНОВАНОГО ТИПУ
Authors: Трушляков Євген Іванович , Радченко Андрій Миколайович , Радченко Микола Іванович , Кантор Сергій Анатолійович , Ткаченко Веніамін Сергійович
Published: August 2019

One of the most attractive reserves of enhancing the energetic efficiency of air conditioning systems is to provide the operation of refrigeration compressors in nominal or close to nominal modes by choosing rational design cooling loads (cooling capacities) and their distribution according to a cooling load behaviour within the overall design (installed) cooling load band to match current changeable climatic conditions and provide close to maximum annual cooling capacity generation according to cooling duties. The direction of increasing the efficiency of outdoor air conditioning in combined central-local type systems by rationally distributing the heat load - cooling capacity of the central air conditioner into zones of variable heat load in accordance with current climatic conditions and its relatively stable value, i.e. cooling capacity required for further air cooling at the entrance to the indoor recirculation air conditioning system is justified. By comparing the values of the excessive production of cold and its deficit within every 3 days for a rational design heat load of the air conditioning system (cooling capacity of the installed refrigeration machine), which provides close to maximum annual production of cold, and the corresponding values of the excess and deficit of cooling capacity in accordance with current climatic conditions during July substantiated the feasibility of accumulating the excess of cooling capacity of a central air conditioner at low current loads and its use for covering cooling deficit at elevated heat loads through pre-cooling the outdoor air. It is developed a scheme of a combined central-local air conditioning system, which includes the subsystems for the outdoor air conditioning in a central air conditioner and the local indoor recirculated air conditioning.
ЧИСЕЛЬНЕ МОДЕЛЮВАННЯ ПРОТОЧНОЇ ЧАСТИНИ МАЛОВИТРАТНОГО АЕРОТЕРМОПРЕСОРА ДЛЯ ПРОМІЖНОГО ОХОЛОДЖЕННЯ ЦИКЛОВОГО ПОВІТРЯ ГАЗОТУРБІННОГО ДВИГУНА
Authors: Коновалов Дмитро Вікторович , Кобалава Галина Олександрівна
Published: August 2019

A cyclic air intercooling application in the compression process in the compressor has a positive effect on the resource of the gas turbine plant (GTP) and on increasing its capacity without reducing the service life. The most promising method of cooling the cyclic air of the GTP, namely contact cooling by using an aerothermopressor, was analyzed in the paper. This heat exchanger is a two-phase jet apparatus in which, due to the removal of heat from the airflow, the air pressure is increased and its cooling occurs. The main problem in the development of the aerothermopressor is to determine the geometric characteristics of the apparatus flow part and the fluid injection system, which allow its effective application for increasing pressure and fluid spraying fine. An analysis was made of the apparatus models operation by using CFD simulation in the ANSYS Fluent software package to determine the aerothermopressor main characteristics of the cyclic air cooling system of the GTP. The calculation method was determined, the turbulence model was selected, the calculation was carried out taking into account the convergence of the results, and the output data were processed and visualized in the CFD-Post in the form of graphs and fields. Based on this, the aerothermopressor design was developed for a WR-21 gas turbine produced by Rolls Royce. At the first stage of the study, a “dry” aerothermopressor was modeled (without water injection into the evaporation chamber). It was found that the decrease in airflow pressure due to friction losses was about 5%. At the second stage of the study, a simulation of the aerothermopressor with water injection into the flow part (at the inlet to the evaporation chamber) was carried out. As a result of thermogasdynamic compression, the increase in the total air pressure at the outlet of the aerothermopressor was 3.1%, and the temperature of the cooled air was decreased by 280 degrees. To ensure effective air compression in the gas turbine compressor, incomplete evaporation of water in the aerothermopressor was considered. It made it possible to obtain finer water spraying at the diffuser outlet, while the average diameter of the water droplet decreased to 2.5 μm.
НАПРЯЖЕННОЕ СОСТОЯНИЕ ПЛОСКИХ ОБРАЗЦОВ С НАПЫЛЕННЫМСЛОЕМ ПРИ ИСПЫТАНИЯХ НА ИЗГИБ
Authors: Лебедев Владимир Александрович , Лой Сергей Анатольевич , Ермолаев Геннадий Владимирович , Матвиенко Максим Валентинович
Published: August 2019

The subject of study is the analysis of the stress state during bending, both in the elastic and elastic-plastic stages, of a flat sample with a sprayed layer having different mechanical properties (elastic modulus and yield strength) than the substrate material. The goal is to select options for coatings of small (soft layer), neutral and large (hard layer) stiffness concerning the base metal, which has a lower yield strength, with different ratios of their thicknesses (0.2, 0.4 and 0.6). Tasks: to analyze the distribution of normal stresses, to determine the most loaded points on the surface of the sprayed layer and on the lower surface of the substrate, to determine the conditions and causes of the appearance of cracks in the sprayed layer and plastic deformations in the substrate. The methods used are computer simulations and analytical calculations. The following results were obtained. The nature of the distribution of normal stresses substantially depends on the ratio of the thicknesses of the sprayed layer and the substrate and does not change with their proportional increase or decrease. The most loaded points in the section where the normal stresses reach maximum values are the points on the surface of the sprayed layer and on the bottom surface of the substrate. The level of maximum normal stresses both in the sprayed layer and the substrate significantly exceeds (by 2 orders of magnitude) the tangents. That is, they are the main cause of the appearance of cracks in the sprayed layer and plastic deformations in the substrate. At the same time, the results of calculations using analytical formulas based on the laws of solid mechanics and computer simulations are the same, which confirms the adequacy of the modeling. The level of stresses at a constant thickness of the substrate is affected by both the relative thickness of the sprayed layer and its rigidity. The maximum stresses in the sprayed layer decrease with an increase in its relative thickness and increase with an increase in its relative rigidity. Соnclusion. The results obtained by various methods of theoretical studies allow us to determine the directions of improvement of equipment, technological methods of selecting modes, active materials for producing sprayed layers with high quality for assemblies and parts of various configurations and different materials of products and sprayed with the material. The findings of the work can be used in practice in the development of technological maps of the processes of deposition. The scientific novelty of the obtained results consists of the following: methods for studying the stress state of flat samples with a sprayed layer during bending tests have been improved; for the first time, the results of the influence of a set of characteristics of the deposition conditions on the strength characteristics of the sprayed layer on the substrate were obtained.
ВЛИЯНИЕ ИЗГИБА ПЛУНЖЕРА НА ИЗМЕНЕНИЕ ОБЪЕМА В ЦИЛИНДРОВОЙ ПОЛОСТИ АВИАЦИОННОГО АКСИАЛЬНО-ПЛУНЖЕРНОГО НАСОСА
Authors: Доценко Владимир Николаевич , Лихошерст Иван Григорьевич , Бурда Мелания Николаевна
Published: August 2019

In this article, the task is to consider the effect of the piston bending in an axial- piston pump under the action of hydraulic force on the kinematics of the pump. The change in kinematics due to the elastic deformation of the piston is estimated by the axial displacement of the piston face. The study takes into account the bias of the plunger in the gap, the elastic bending deformation of the plunger, the contact deformation of the plunger and the cylinder block. The task is considered on three models: a rigid piston in a rigid cylinder block; deformable piston in a rigid cylinder block; deformable piston, block, shoe, and disk. The values of the displacement of the piston, caused by elastic forces and misalignment in the gap depending on its position were obtained for the first time as a result of the analysis. The problem is solved both analytically and numerically using the finite element method. In the analytical solution of the problem, the piston is represented as a beam supported by pin and roller at the points of contact of the piston with the walls of the cylinder block. The three-dimensional model of the pump is applied to solve the problem by the finite element method, the contact deformation of the piston and the block is considered. According to the simulation results, the displacement of the piston is obtained depending on the position of the piston. The results of modeling an analytical model are presented in the form of a smooth function, and the results of numerical simulation using the finite-element method obtained for several points are interpolated by a smooth function. The conclusions suggest that the greatest deformations are achieved in the piston located at the bottom dead center, and the gap between the piston and the sleeve and the overall stiffness of the contact parts have the greatest effect. The results of the work can be used to correct the geometrical parameters of a heavily loaded aviation axial-plunger pump to reduce flow and pressure pulsations caused by the kinematics of the pump.
ОПРЕДЕЛЕНИЕ ДРОССЕЛЬНОЙ ХАРАКТЕРИСТИКИ ТУРБОВАЛЬНОГО ГТД НА ОСНОВЕ МЕТОДА МАТЕМАТИЧЕСКОГО МОДЕЛИРОВАНИЯ С ИСПОЛЬЗОВАНИЕМ ОДНО- И ДВУМЕРНЫХ ПОДХОДОВ К РАСЧЕТУ ПАРАМЕТРОВ КОМПРЕССОРА
Authors: Бойко Людмила Георгиевна , Даценко Вадим Анатольевич , Пижанкова Наталия Владимировна
Published: August 2019

The results of mathematical modeling processes in the turboshaft gas turbine engine (GTE) are presented. The using calculation method based on a high-level GTE mathematical model, which is founded on a multi-stage axial compressor blade-to-blade description. The model was developed at the Aviation Theory Chair of National Aerospace University “KhAI”. The model is based on a multistage axial compressor thermodynamic parameters calculations using a 1D and 2D approaches to analyzing of the flow. The model named above allows one to take into account air intakes from of the compressor blade gaps, as well as adjusting the angles of installation of the rotary stator vanes depending on the rotational speed. The GTE model has a modular structure. To determine the compressor parameters the modules for 1D or 2D flow calculation can be connected. As the initial data, besides the data traditionally specified in the 1st level GTE models it is necessary to set the geometrical parameters of the compressor flow path and blades on the medium radius (for the 2nd level GTE model) or along with the blade height (for the 3rd level). Both calculating compressor parameters methods are verified and have a fairly wide experience of practical use. The article presents the results of calculating the maps of the GTE multi-stage compressor using one- and two-dimensional approaches. Comparison of the compressor performances achieved by using of these two methods among themselves and with the experimental data has shown their good agreement. The approach used to simulate the flow in compressors makes it possible to estimate, by calculation, the surge margin, to consider the incidence angles and other flow parameters in the blade gaps in a wide range of GTE operation modes. Such results, as well as a comparison with experimental data, are presented in the article. The article also demonstrates the results of applying the described above model to the gas turbine engine performances calculation. The engine has the 12-stage axial compressor with the stator blades position of the first stages regulation. The calculated line of joint operation modes of the gas generator units, the dependence of the power and specific fuel consumption on the rotational speed. Presented are the processes in GTE on stationary modes analyzing results given in the article showed the used model advantage, reliability and expediency of its practical application.
ЕФЕКТИВНІСТЬ ЕНЕРГОТЕХНОЛОГІЧНОЇ УСТАНОВКИ ЩОДО ВИДОБУВАННЯ СІРКОВОДНЮ З ГЛИБИН ЧОРНОГО МОРЯ
Authors: Ткач Михайло Романович , Тимошевський Борис Георгійович , Проскурін Аркадій Юрійович , Галинкін Юрій Миколайович
Published: August 2019

The article discusses a promising energy-technology unit for the extraction of hydrogen sulfide from the deep waters of the Black Sea, which provides for raising the gas-liquid mixture from the depths by the gas-lift method using wave pulses to separate hydrogen sulfide in the gaseous state. The installation includes a supply line, which is lowered to the required depth, a supply pump, a coalescing separator, a seawater discharge line with a reduced concentration of hydrogen sulfide, a control valve, a hydrodynamic generator of mechanical vibrations, a lifting pipeline, a high pressure hydrogen sulfide separator, a hydraulic turbine, a low pressure hydrogen sulfide separator, seawater discharge pipe and hydrogen sulfide expander. This unit will improve the energy efficiency and operational reliability of the process of hydrogen sulfide production, as well as reduce the burden on the Black Sea environment. A mathematical model of this setup has been developed. The results obtained by the mathematical model adequately coincide with the known experimental ones. This suggests that it is possible to use the model to determine the parameters of the process for the extraction of hydrogen sulfide from the Black Sea. The parameters of the process for the extraction of hydrogen sulfide from the Black Sea in the depth range of the pipeline 0...1000 m at a temperature of 280...285 K. It has been established that increasing the gas content of seawater from 0 to 2.5 m3/m3 leads to a decrease in the pressure value by 2.2 MPa. A further increase in seawater gas content from 2.5 to 5.0 m3/m3 is accompanied by a decrease in pressure of another 1.6 MPa. Such a significant decrease in pressure at the inlet to the riser piping allows hydrogen sulfide and seawater to be obtained at a pressure that is substantially greater than atmospheric. The excess pressure at the outlet of the lifting pipeline is determined based on data obtained by the method of "equivalent length". When the seawater gas content is 2.5 m3/m3, the pipeline’s immersion depth is 250...1000 m, the value of the overpressure of substances at the exit of the lifting pipeline will be 0.2...0.45 MPa, and at 5 m3/m3 – 0.67...1.07 MPa, at 7.5 m3/m3 – 0.83...1.4 MPa and at 10 m3/m3 – 0.97...1.68 MPa.
МЕТОДОЛОГІЧНІ ПІДХОДИ ДО ВИЗНАЧЕННЯ ХОЛОДОПРОДУКТИВНОСТІ СИСТЕМ КОНДИЦІЮВАННЯ ПОВІТРЯ ЗА ЗМІННИХ КЛІМАТИЧНИХ УМОВ
Authors: Трушляков Євген Іванович , Радченко Андрій Миколайович , Радченко Микола Іванович , Фордуй Сергій Георгійович , Кантор Сергій Анатолійович , Портной Богдан Сергійович
Published: August 2019

One of the most attractive reserves for improving the energy efficiency of air conditioning systems is to ensure the operation of refrigeration compressors in nominal or close to nominal modes by selecting a rational design heat load and distributing it within its design value according to the behavior of the current heat load under variable current climatic conditions to provide the maximum or close to maximum annual cooling capacity generation according to cooling duties of air conditioning. In the general case, the overall range of current thermal loads of any air conditioning system includes a range of unstable loads associated with the precooling of ambient air with significant fluctuations in cooling capacity according with current climatic conditions, and a relatively stable range of cooling capacity consumed to further reduce air temperature from a certain threshold temperature to the final outlet temperature. It is quite obvious that a stable range of heat load can be ensured within operating a conventional compressor in a mode close to the nominal mode while precooling the ambient air with significant fluctuations in heat load requires regulation of the cooling capacity through the use of a variable speed compressor. Thus, in response of the behavior of the change in current heat loads, any air conditioning system, whether the central air-conditioning system with its heat procession in a central air conditioner, or a combination thereof with a local recirculation system of indoor air, essentially consists of two subsystems: pre-cooling the ambient air and then cooling it to the set point temperature. The proposed method of distribution of design heat load depending on the behavior of the current heat load is useful for the rational design of central air conditioning systems and their combined versions with the local air conditioning system.
ІНТЕРПРЕТАЦІЯ ВІБРАЦІЙНИХ СИГНАЛІВ СКЛАДНОЇ РОТОРНОЇ СИСТЕМИ НА ОСНОВІ ФРАКТАЛЬНОГО АНАЛІЗУ
Authors: Бурау Надія Іванівна , Паздрій Ольга Ярославівна
Published: August 2019

The work analyzes vibration signals obtained by simulating a turbine of a complex rotor system, for example, an aviation gas turbine engine, under conditions of stationary and non-stationary excitations. Four modes of vibration excitation are considered: stationary poly-harmonic excitation with the frequency of rotor rotation and super-harmonic components; stationary poly-harmonic excitation with the frequency of rotor rotation and sub-harmonic components; non-stationary vibration excitation with a linear increase in the rotor speed with super-harmonic and sub-harmonic components of the instantaneous rotor speed. In the course of the turbine model, vibration signals are generated, which are further analyzed without taking into account and taking into account additive noise. For signal processing, fractal and time-scale (wavelet) analysis were used. The determination of the fractal structure of the simulated vibration signals is made based on R / S analysis, or the method of normalized scope, as a result of which the Hurst exponent is determined. The Hurst exponent is a number that is interpreted as the ratio of the “strength” of a trend to the signal noise level and is used in the study to interpret the received vibration signals. The results showed that the vibration signals obtained in all considered modes of vibration excitation without taking into account the additive noise, in terms of the Hurst exponent, are classified as anti-persistent trend-non-stable signals. Taking into account additive noise, the Hurst exponent increases, the vibration properties in stationary excitation modes approach persistence and the appearance of a trend, and in non-stationary vibration excitation signals approach to processes such as white noise. For the vibration signal obtained at stationary poly-harmonic excitation with super-harmonic components, a preliminary wavelet - decomposition was carried out into a set of approximations and details, followed by determination of the Hurst exponent for each element of decomposition. The results obtained showed an ambiguous change in the Hurst exponent for various decomposition elements. The obtained results can be used to improve the methodological and algorithmic support systems for functional diagnostics of complex rotor systems with the appearance and propagation of damage to their rotating elements.
ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ОБРОБКИ НАНОКОМПОЗИЦІЯМИ ЛИВАРНИХ ЖАРОСТІЙКИХ СПЛАВІВ ДЛЯ АВІАЦІЙНИХДВИГУНІВ
Authors: Грекова Марина Викторовна , Калинина Наталия Евграфовна , Калинин Василий Тимофеевич , Джур Евгений Алексеевич , Бондаренко Олег Витальевич
Published: August 2019

It is studied the existing aspects of the modification of multicomponent alloys. It is carried out the analytical review of existing ideas about the problem of increasing the corrosion resistance of heat-resistant nickel alloys of the JS group. It is analyzed the influence of alloying elements on structural transformations, types of hardening and corrosion resistance. It is determined criteria for the physical properties of modifiers of nickel alloys: the magnitude of the ionization potential, insolubility in the melt, the crystallization interval according to the state diagram. It is analyzed the modification of melts with modifiers based on pure transition metals and rare-earth metals. Experimental work was carried out on the smelting of heat-resistant nickel alloy ZS6K in the industrial engineering production. A scheme has been developed for a rational technological smelting process using powder modifier in tablet form. Particular attention was paid to the preparation of charge materials and their cleaning. Casting molds were obtained by serial technology of the workshop of a machine-building enterprise. Models of castings were made in special molds. The model mass was smelted by the technological process, and the form was roasted at a temperature of 950 ... 1050 ° C. The alloy was smelted and the forms were cast in a vacuum with a residual pressure of 0.13 ... 6.66 Pa, the residual pressure was changed during deoxidation to 13 Pa. The uniform distribution of the modifier in the melt volume was provided by induction stirring in the crucible. It is proposed a complex powder modifier based on titanium carbonitride Ti (CN) in tablet form for the treatment of nickel melts. It was studied the macro and microstructure of the ZS6K nickel alloy. The regularities of the effect of modifying dispersed refractory titanium carbonitride composition on the increase in the complex properties of a multicomponent nickel alloy are established. It was achieved a significant grinding of alloy grains as a result of modification, which led to an increase in strength properties up to 10% and impact strength up to 35%. The corrosion resistance of ZhS6K alloy in an oxidizing environment increased, the depth of corrosion at a temperature of 1000 ° decreased by 25% compared to the unmodified state.
ВНЕДРЕНИЕ РИСК-ОРИЕНТИРОВАННОГО МЫШЛЕНИЯ В ПРАКТИКУ ПРОЕКТИРОВАНИЯ АВИАЦИОННЫХ ДВИГАТЕЛЕЙ
Authors: Цинык Яна Леонидовна , Харченко Виталий Григорьевич
Published: August 2019

It is regarded the requirements of standard DSTU ISO 9001 - 2015 and main principles of risk-management introduction in the organization, and also the necessity of planning actions, connected with risks and possibilities of planning in the aviation engines creation in the general system of enterprise quality management. It is analyzed the system approach to the consideration of risks. It is determined, that in the hierarchical structure of project works of the risks management should be three task blocks, base steps, applicable in any situation, in any business and at any level of the hierarchy the enterprises necessary at the introduction of managerial process. It is defined, that the direction of efforts to the possible risk-management creates a basis for the increase of productivity of quality management system in general, achievements of the improved results and prevention of adverse consequences. The idea develops, that the risk-management is a link with all other organization management systems. Thus, introducing procedures and risk-management tools in SMK, we could consistently develop risk-focused thinking of all heads and employees of the enterprise. The essence of risks management comes down to prioritization and correct distribution of resources. It is marked, how it is important to carry out the predesign preparation when the team together with management audits an existing state of the company. How it is necessary to formulate exact results which will be reached during the project, and aspire to them. To be able to formalize protection of results of the project, to show to yourself, to management and employees of the enterprise, that management even if it is an only small local process, became risk-focused and works by new rules. It is noted, how much important do not make mistakes in the work on of risks control system introduction. Otherwise, we automatically cease to introduce this system and start to develop, adapt and update the indefinitely difficult, more hierarchical system of document circulation which is an excellent simulator of the risks control system. Do not to try with the help documents and registers to simulate the working risks control system, it is better to develop the good tools help to spend our budget correctly on the solution the necessary and priority problems. The essence of risks management comes down to prioritization and correct distribution of resources. Risk-management studying is an important problem for heads of all levels of the modern enterprise. It is a universal and demanded field of knowledge. The information on the given issue is accessible, experts are opened to dialogue, the community of risk-managers grows every year
ОСОБЕННОСТИ АВТОРИЗАЦИИ И ОЦЕНКИ СТОИМОСТИ ВСТРОЕННОГО И ПРИКЛАДНОГО ПРОГРАММНОГО ОБЕСПЕЧЕНИЯ АВИАЦИОННОГО ПРИМЕНЕНИЯ В УКРАИНЕ
Authors: Волошина Наталия Павловна , Нерубасский Вадим Владимирович
Published: August 2019

It is stated the increase in the complexity and cost of software in the aviation industry in recent years. It is noted that JSC “Element” actively embodies the ideology of software protection, and extends it to the structural elements of computer programs, including those that are embedded software for aviation, and software-technical complexes for testing GTE. It is revealed the key features that determine the need for registration of authorship for software for aviation applications, among which the main one is the fulfillment of the qualification requirements of KT-178 (American RTCA DO-178 / Europian EASA ED-12). It is defined software as an object of copyright according to the legislation of Ukraine. It is highlighted the complexity of protecting software components: code, algorithms, source code. It is indicated that the main feature of aviation software is to ensure safety requirements. KT-178 qualification requirements (DO-178 / ED-12) have a significant impact on the cost of developing aviation software. Reference is made to the methodological approaches used in assessing property rights to the software according to the National Standard of Ukraine. It is given a brief description of other approaches in estimating the cost of software, including the method of analogies, research and empirical methods based on mathematical models, statistical data, neural and Bayesian networks, etc. At the same time, it is given the specific combinations of methods can be selected based on specific assessment objectives, which is the subject of special study. It is provided the overview of the main factors determining the market value of intellectual property A list of key documents provided to the software evaluator. Such an important fact is noted as the level of confidence in the appraiser from both the developers and the consumers. The obtained estimated value of property rights to software can be used by the owner in the sale of licenses and, last but not least, in determining the value of new contracts that provide for the development of software for aviation applications.
ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ СИСТЕМ КОНДИЦІЮВАННЯ ПОВІТРЯ ШЛЯХОМ РОЗПОДІЛУ ТЕПЛОВОГО НАВАНТАЖЕННЯ ЗА СТУПЕНЕВИМ ПРИНЦИПОМ
Authors: Трушляков Євген Іванович , Радченко Микола Іванович , Радченко Андрій Миколайович , Фордуй Сергій Георгійович , Кантор Сергій Анатолійович , Ткаченко Веніамін Сергійович , Портной Богдан Сергійович
Published: August 2019

Maintaining the operation of refrigeration compressors in nominal or close modes by selecting a rational design thermal load and distributing it in response to the behavior of the current thermal load according to the current climatic conditions is one of the promising reserves for improving the energy efficiency of air conditioning systems, which implementation ensures maximum or close to it in the annual cooling production according to air conditioning duties. In general case, the total range of current thermal loads of any air-conditioning system includes a range of unstable loads caused by precooling of ambient air with significant fluctuations in the cooling capacity according to current climatic conditions, and a range of relatively stable cooling capacity expended for further lowering the air temperature from a certain threshold temperature to the final outlet temperature. If a range of stable thermal load can be provided within operating a conventional compressor in a mode close to nominal, then precooling the ambient air with significant fluctuations in thermal load requires adjusting the cooling capacity by using a variable speed compressor or using the excess of heat accumulated at reduced load. Such a stage principle of cooling ensures the operation of refrigerating machines matching the behavior of current thermal loads of any air-conditioning system, whether the central air conditioning system with ambient air procession in the central air conditioner or its combination with the local indoors recirculation air conditioning systems in the air-conditioning system. in essence, as combinations of subsystems – precooling of ambient air with the regulation of cooling capacity and subsequent cooling air to the mouth of the set point temperature under relatively stable thermal load.