bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fine-grained Fiber Concrete on Mechanoactivated Portlandcement
Authors: Anatolii Vorokhaiev , Ivan Barabash , Liubov Ksonshkevych , Zeljko Kos , Iryna Grynyova 
Published: September 2021

Abstract
This article is devoted to the study of the mechanical properties of fine-grained concrete used for flooring in industrial and civil buildings. Characterized by the well-known advantages (unlimited raw material base, manufacturability, high homogeneity), fine-grained concrete requires an increased consumption of cement to achieve the necessary mechanical characteristics - compressive strength, abrasion, impact resistance. An alternative to the known technological method is proposed an intensive separate technology (IST) for preparing fine-grained concrete mixtures using a high-speed mixer-activator in the presence of hydrophobized basalt fiber and a polycarboxylate superplasticizer Relaxol-Super PC. The use of IST leads to an increase in the strength of fine-grained concrete in compression by 1.9 times, impact resistance by a factor of 2, and a decrease in abrasion by 40... 50% in comparison with the control. The relevance of using the technology of monolithic floors for industrial and civil construction is due to a wide range of varieties of Portland cement, the grain composition of aggregates, as well as the simplicity of the technology for preparing a fine-grained concrete mixture.
Frost resistance of cement-sand and concrete beams during unilateral freezing
Authors: Nikolaevich Nepomyach Alexander , Nikolaevich Vyrovoy Valeriy , Aleksaedrovich Chistyakov Artem 
Published: September 2021

Abstract
The work investigates changes in the beam structure under the action of local freezing, which leads to a change of the mechanical properties of the material and, consequently, of the beam structure. Two types of beam samples were used: from cement-sand mortar and from concrete. The work investigates the change in the development of deformations depending on the conditions of freezing of samples. The second accelerated method for assessing frost resistance was chosen according to DSTU B В.2.7-47-96. An accelerated method was chosen for assessing frost resistance at the temperature of -20 ±2 C°. After every five freeze-thaw cycles, the following changes were monitored: mass, water absorption, ultrasound transmission rate, damage coefficient, tensile bending strength, splitting strength, compressive strength, carbonization depth. The results showed that both in concrete and in mortar samples, the compressive strength after freezing was lower by 8% and 15% accordingly. The experimental results obtained confirm the assumptions made that the frost resistance of the material depends on the conditions of exposure of negative temperatures on products and structures and it can be used in a wider range of construction which will push regional development.
Innovative methods of non-destructive evaluation of log quality
Authors: Ondrejka Vojtěch , Gergeľ Tomáš , Bucha Tomáš , Pástor Michal 
Published: September 2021

Abstract
For the sustainability of an important renewable resource, such as wood, it is important to significantly increase the efficiency of its processing. A large part of this raw material ends up in the wood processing industry, where it is used for the production of pulp, paper, construction and furniture timber, floors and others. Therefore, it is very important to gain the knowledge needed for optimal valuation of raw wood material, through quality detection and classification into quality classes. There are many defectoscopic methods working on different physical principles. The most familiar of these methods are semi-destructive and non-destructive, as they do not cause damage to the tree or wood during assessment. The aim of this article is to describe, assess and compare known semi-destructive and non-destructive methods for the assessment of wood properties. This article describes basic visual inspection, basic semi-destructive methods (Pilodyn, Resistograph) and advanced semi-destructive methods (SilviScan®, DiscBot®) as well. Non-destructive methods use mostly acoustic wave motion (acoustic, ultrasonic), high-frequency waves (using georadar, microwave) and methods based on visual evaluation (image, laser). At last, there are X–ray methods with the latest technology using three-dimensional (3D) computed tomography (CT). The implementation of modern non-destructive methods is of great importance for the application of principles of Industry 4.0, where these methods provide collecting of data on the material properties, in its entire production flow of log processing.
Ahorro del costo de hospitalización con técnica WALANT en la resolución quirúrgica del síndrome del túnel carpiano y tenosinovitis de De Quervain. Evaluación de costos en un hospital privado de Quito, Ecuador
Authors: Cayón Cayón Fidel , Alarcón Serrano Juan Pablo 
Published: September 2021

Introducción. El interés en los beneficios del uso de técnicas anestésicas regionales en ortopedia y traumatología ha aumentado en los últimos años ya que estas permiten realizar varios procesos quirúrgicos en la mano y en la muñeca de forma segura y ambulatoria, y sin los efectos secundarios de la anestesia general ni la necesidad de monitorización en la unidad de cuidados posanestésicos, disminuyendo así el uso de los recursos hospitalarios.
Objetivo. Estimar el valor promedio de ahorro en los gastos en procedimientos quirúrgicos de la mano en pacientes atendidos con la técnica WALANT comparada con anestesia general.
Materiales y métodos. Se compararon los costos que ocasionaron 14 pacientes operados mediante la técnica WALANT versus los ocasionados por 13 pacientes operados bajo anestesia general.
Resultados. Las cirugías realizadas mediante técnica WALANT implicaron un menorcosto en comparación a las ejecutadas bajo anestesia general.
Conclusiones. La cirugía del síndrome del túnel carpiano y tenosinovitis de De Quervain bajo anestesia local sin torniquete y con el paciente despierto (técnica WALANT) permite disminuir los costos en un promedio de US$391,80 (54.36%).
Using smartphone-based accelerometers to gauge postoperative outcomes in patients with NPH: Implications for ambulatory monitoring
Authors: Sprau Annelise Claire , Basil Gregory W. , Eliahu Karen , Vallejo Frederic A. , Luther Evan M. , Yoon Jang W. , Wang Michael Y. , Komotar Ricardo J. 
Published: September 2021

Background:
The surgical treatment of normal pressure hydrocephalus (NPH) with shunting remains controversial due to the difficulty in distinguishing such pathology from other neurological conditions that can present similarly. Thus, patients with suspected NPH should be carefully selected for surgical intervention. Historically, clinical improvement has been measured by the use of functional grades, alleviation of symptoms, and/or patient/family-member reported surveys. Such outcome analysis can be subjective, and there is difficulty in quantifying cognition. Thus, a push for a more quantifiable and objective investigation is warranted, especially for patients with idiopathic NPH (INPH), for which the final diagnosis is confirmed with postoperative clinical improvement. We aimed to use Apple Health (Apple Inc., Cupertino, CA) data to approximate physical activity levels before and after shunt placement for NPH as an objective outcome measurement. The patients were contacted and verbally consented to export Apple Health activity data. The patient’s physical activity data were then analyzed. A chart review from the patient’s EMR was performed to understand and better correlate recovery.

Case Description:
Our first patient had short-term improvements in activity levels when compared to his preoperative activity. The patient’s activity level subsequently decreased at 6 months and onward. This decline was simultaneous to new-onset lumbar pain. Our second patient experienced sustained improvements in activity levels for 12 months after his operation. His mobility data were in congruence with his subjectively reported improvement in clinical symptoms. He subsequently experienced a late-decline that began at 48-months. His late deterioration was likely confounded by exogenous factors such as further neurodegenerative diseases coupled with old age.

Conclusion:
The use of objective activity data offers a number of key benefits in the analysis of shunted patients with NPH/INPH. In this distinctive patient population, detailed functional outcome analysis is imperative because the long-term prognosis can be affected by comorbid factors or life expectancy. The benefits from using smartphone-based accelerometers for objective outcome metrics are abundant and such an application can serve as a clinical aid to better optimize surgical and recovery care.
A rare case of ruptured intracranial aneurysm arising from the retro-mastoid branch of the occipital artery
Authors: Aljuboori Zaid , McGrath Margaret , Jadhav Rahul , Ghodke Basavaraj , Sekhar Laligam 
Published: September 2021

Background:
Aneurysms of the occipital artery (OA) are rare, with few cases published in the literature. The pathophysiology is unknown, and the presentation is variable. We present a case of a ruptured intracranial aneurysm arising from a branch of the OA.

Case Description:
A 36-year-old male with a history of ankylosing spondylitis presented with altered mental status after an assaulted. On examination, he was intubated, with a Glasgow coma scale of 9, and imaging of the head and neck revealed a subdural hematoma of the posterior fossa and the cervical spine. The patient underwent suboccipital craniectomy and C1-5 laminectomy with the evacuation of the subdural hematoma. Postoperative cerebral angiography showed an intracranial aneurysm arising from the retromastoid branch of the OA on the left side. Furthermore, the parent vessel of the aneurysm supplied the left lower half of the cerebellar hemisphere. The aneurysm and the parent vessel were embolized using platinum coils. The patient tolerated the procedure well, and magnetic resonance imaging of the brain showed a minor left-sided cerebellar infarct, which was asymptomatic. The patient was discharged home with a modified Rankin scale of 2. There were no outpatient follow-up data available because the patient lost to follow-up.

Conclusion:
Intracranial OA aneurysms are extremely rare with no clear consensus concerning the management of these aneurysms. They can be treated using endovascular and or open surgical techniques depending on the aneurysm characteristics, patient condition, rupture status, and others.
Fundido en negro
Authors: Santamaría Alonso Julio 
Published: September 2021

Resumen: La serie Blacksad, del guionista Juan Díaz Canales y el dibujante Juanjo Guarnido, ha cosechado un gran éxito internacional desde su aparición a finales del año 2000. La apuesta de los autores, ganadora a la postre, fue crear una historieta protagonizada por animales en un universo realista noir de los EE. UU. de los años 50 del pasado siglo. Si bien Blacksad nació de la admiración por las grandes novelas y películas de serie negra, la vinculación de los álbumes del gato detective con el cine va más allá, sin embargo, de esta relación directa. En sus páginas es posible encontrar alusiones y homenajes a películas de diferentes géneros que han ayudado a conformar el decorado, los personajes e incluso las tramas de las aventuras del protagonista a lo largo de los cinco volúmenes publicados hasta el momento.
Abstract: The Blacksad series, by scriptwriter Juan Díaz Canales and illustrator Juanjo Guarnido, has enjoyed great international success since its creation in late 2000. The authors took a chance – and eventually succeeded – on creating a comic novel starring animals set against a realist, noir, 1950s America background. Blacksad was born out of the authors’ admiration for great noir novels and films, but the link between the cat detective albums and the cinema goes well beyond this point. Throughout the albums’pages we find hints and tributes to many genre films in aspects such as the general background, the personae, and even the plots of the main character’s adventures, which span five volumes so far.
Using Process Writing Approach (PWA) to Teach Writing Descriptive Text
Authors: Novia Fitri , Saptarina Eva 
Published: September 2021

The research aim was to find out whether or not there was a significant difference in students' writing performance from descriptive passage among learners who practiced using the Process Writing Approach and those who were not. The design of that research used quasi-experimental. Participants were selected from X TKJ 3 being the experimental group and X TKJ 2 being the control group. Instruments of this study used a written test. There were five topics about the descriptive text in which students chose one of the issues. A paired sample t-test and independent-sample t-test were used to investigate the data. The outcome acquired from the paired sample t-test confirmed that students' writing achievement increased in the descriptive text after using the process writing approach. Independent-samples t-test analysis revealed that pvalue (0.008) was lower than άvalu (0.05). Further analysis indicated a significant difference in students' writing performance from a descriptive passage within learners who practiced using the Process Writing Approach.
FETUS PAPYRACEOUS
Authors: AKBAR MISBAH , Saeed Roohi , IKRAM MUHAMMAD , Saeed M. , TALIB WASIM 
Published: September 2021

Twenty years old primigravida was registered as a case of twin gestation at 20 weeks and advised usual baseline antenatal work up as a routine. The baseline/initial scan revealed one alive issue consistent with the gestationa age of 23 weeks with one intrauterine death at gestational age of 18 weeks. Expectant management with regular follow up and monitoring was planned for the patient which included frequent antenatal visits, ultrasonographic surveillance and monitoring of coagulation profile, after proper conunselling and discussion with the patient.
PENERAPAN SISTEM AKUNTANSI SYARIAH DALAM ASURANSI SYARIAH DI INDONESIA
Authors: Kasim Adriandi 
Published: September 2021

Perkembangan ekonomi dunia yang semakin pesat telah menghasilkan berbagai macam perusahaan dan lembaga-lembaga keuangan di Indonesia, baik itu bank ataupun non bank. Sejalan dengan perkembangan tersebut juga memicu pemikiran masyrakat muslim akan keberadaan serta aktivitas dari perusahaan dan lembaga keuangan. masyrakat muslim meragukan aktivitas lembaga keuangan, sehingga berdirilah lembaga keuangan dengan basic syariah. Namun perkembangan lembaga keuangan syariah yang semakin pesat juga memicu masyarakat akan perlakuan akuntansinya yang sama dengan lembaga keuangan konven lainnya, sehingga ditetapkanlah sistem akuntansi syariah untuk lembaga keuangan syariah. Dalam hal ini penulis membahas sistem akuntansi syariah dalam asuransi syariah dengan menggunakan metode penelitian jenis kajian yang datanya di ambil dari buku hingga jurnal ilmiah. Hasil diskusi yang penulis peroleh pada penelitian artikel kali ini yaitu Akuntansi syariah merupakan proses pencatatan, pernggolongan, pengikhtisaran dan pelaporan keuangan di dalam satu perusahaan selama periode tertentu yang mengacu pada syariat islam. Sistem Akuntansi dalam asuransi yang berbasis syariat terdapat pada perlakuannya, prinsipnya yakni keadilan, dan penerapannya.Berbeda dengan akuntansi pada umumnya, akuntansi syariah mengutamakan prinsip-prinsip syariah. penerapan akuntansi pada asuransi syariah salah satunya yaitu diakui dalam laporan keuangan periode selanjutnya apabila perolehan premi insurance tersebut terjadi sebelum tanggal transaksi. Dari hasil tersebut penulis menyimpulkan bahwasannya asuransi syariah sudah menerapkan akuntansi sesuai dengan syariat Islam yakni akuntansi syariah. Akuntansi syariah ini sangat penting dalam pembuatan laporan keuangan pada asuransi syariah dan juga lembaga syariah lainnya. Semakin luas kita memahami konsep akuntansi syariah maka akan semakin baik pula pelaporan yang akan kita buat.
ІНТЕГРОВАНИЙ ПІДХІД ЩОДО ВИЗНАЧЕННЯ ПОХІДНОЇ ФУНКЦІЙ, ЗАДАНИХ НА НЕПЕРЕРВНИХ ТА ДИСКРЕТНИХ МНОЖИНАХ
Authors: Лукашова Тетяна , Страх Олександр 
Published: September 2021

Важливим елементом у підготовці майбутнього фахівця у галузі математики є набуття ним комплексних знань шляхом вивчення узагальнюючих теорій та методів, за допомогою яких визначаються основні фундаментальні поняття. На сьогодні існує цілий ряд таких теорії і їх використання виокремлюється навіть у самостійні наукові напрямки. Застосування елементів узагальнення та порівняння об’єктів вивчення різних математичних дисциплін у навчальному процесі також відіграє важливу роль в побудові міждисциплінарних зв’язків, які у свою чергу сприяють всебічному розвитку майбутнього спеціаліста, реалізації його потенціалу у науковій та професійній діяльності.
Формулювання проблеми. Аналізуючи основні положення диференціального та різницевого числень, неважко помітити значну схожість між властивостями похідної та різницевого оператора, що є ключовими характеристиками функцій, які визначені на неперервних та дискретних множинах відповідно. Виявляється, що ця схожість не випадкова, і вказані поняття є частинними випадками поняття дельта-похідної функції.
Матеріали і методи. Авторами використовувались наступні методи: системний аналіз наукової, навчальної та методичної літератури; порівняння та синтез теоретичних положень; спостереження за ходом педагогічного процесу; узагальнення власного педагогічного досвіду та досвіду колег з інших закладів вищої освіти. Окрім того, були використані деякі загально математичні та спеціальні методи диференціального та різницевого числень і теорії часових шкал.
Результати. У статті розглянуто загальний підхід до вивчення двох фундаментальних математичних понять – поняття похідної та різницевого оператора з точки зору спеціальної теорії часових шкал, а також шляхи використання такого підходу щодо встановлення зв’язків між різними математичними теоріями з метою формування у студентів цілісного уявлення про математичні об’єкти, їх властивості та застосування.
Висновки. Встановлення зв’язків між моделями і методами дослідження, які використовуються при вивченні різних математичних дисциплін, що входять у програму підготовки майбутніх фахівців-математиків, дозволяє сформувати у студентів цілісне уявлення про математичні об’єкти, алгоритми та теорії, і як наслідок, робить їх знання системними і практично більш значущими. Це сприяє інтелектуальному розвитку студентів, формуванню в них системних математичних знань, підвищенню рівня математичної грамотності та інтересу до предмету.
EFFICIENCY OF THE NOZZLES OF CONTACT HEAT EXCHANGERS
Authors: Klimov R. , Kirilyuk V. 
Published: September 2021

At powerful thermal power plants or boiler houses, the efficiency depends to the greatest extent on the amount of heat lost with the cooling of turbine condensers, exhaust gases that have a high temperature. Each type of such losses is a large unused energy potential, that is, a secondary energy resource that can be used. At the same time, the use of secondary resources and industrial emissions will improve the ecological situation in the regions, and this has always been an urgent task.
As a rule, large losses of thermal secondary energy resources in boilers are reduced by installing economizers and air heaters. Contact types of heat exchangers are distinguished by the best efficiency in operation. In contact economizers, to increase the surface of heat and mass transfer, it is advisable to use various types of nozzles.
The aim of the study is to develop such an indicator, with which it is possible to determine the optimal type of nozzle of the contact economizer installed after the steam boiler. This indicator should show the highest heat engineering efficiency of the packing with a small hydraulic resistance of the heat exchanger.
By using the coefficient of specific energy efficiency of the packing in the heat exchanger of waste gases of heating equipment, it is possible to analyze the work of the packing space from the standpoint of thermal and hydraulic efficiency and select the optimal type of packing for each individual unit or installation. Geometric parameters determine the required volume of the apparatus and the hydraulic resistance of the exhaust gases movement. The hydraulic resistance affects the consumption of electrical energy for the drive of smoke exhausters for sucking off exhaust gases from heat engineering installations through the free section of the heat exchanger. Taking into account the developed indicator of the specific energy efficiency in waste heat utilizers, it is possible to select such a type of packing, at which the optimal level of waste heat utilization will be achieved.
RESEARCH SENSITIVITY OF THE ROTOR FLUX LINKAGE OBSERVER TO CHANGE PARAMETERS OF THE ASYNCHRONOUS MACHINE
Authors: Klyuyev O. , Sadovoi O. , Sokhina Y. 
Published: September 2021

When changing the parameters of the control object to ensure the required quality of control, the tuning parameters of the control system must be changed. Investigation of the sensitivity of mathematical models helps to choose the right technical parameters of the regulators. Therefore, there is an urgent scientific task, which consists in the development of mathematical models for calculating the steady-state values ​​of the sensitivity functions of the coordinates of non-linear systems to changes in their parameters.
When synthesizing observers of the rotor flux linkage, it is indicated that the signal for evaluating the rotor flux linkage is most sensitive to a change in the active resistance of the rotor of an induction machine. However, the numerical values ​​of the transmission coefficients between the coordinates of the observer and the increments of the parameters of the asynchronous machine during its operation are not given, which does not allow a comparative analysis of the degree of influence of changes in certain parameters of the asynchronous machine on the signals of the observer of the flux linkage.
The task is to find and compare the numerical values ​​of the functions of the sensitivity of the coordinates of the observer of the rotor flux linkage to the change in the parameters of the asynchronous machine by joint analytical solution of the static equations of the observer's sensitivity model and the state model of the asynchronous machine.
In this work, analytical expressions are obtained for the steady-state values ​​of the sensitivity functions of the coordinates of such a nonlinear object as an observer of the rotor flux linkage to a change in the parameters of an asynchronous machine. A comparative analysis of the values ​​of the transmission coefficients between the parameters and coordinates in the system asynchronous machine — observer of the rotor flux linkage for its various rotation speeds is carried out. The proposed technique makes it possible to find the numerical values ​​of the transmission coefficients and to compare the degree of influence of various parameters of the asynchronous machine on the coordinates of the flux linkage observer. Transient processes obtained in the course of solving the equations of the dynamics of an asynchronous electric drive with an observer of flux linkage complement the results of analytical calculations. The performed calculations are aimed at increasing the depth of analysis of the properties of the flux link observer, which helps to reasonably choose the structure of feedbacks when synthesizing a closed observer.