bluuebunny/crossref_metadata_2025 huggingface dataset:
Distribution of antimonium chalcogenides under conditions of vacuum thermal processing of mattes
Authors:   “Institute of Metallurgy and Ore Beneficiation” JSC, Volodin V.N. ,   Satbayev University,   The Institute of Nuclear Physics, Trebukhov S.A. ,   “Institute of Metallurgy and Ore Beneficiation” JSC; Satbayev University, Nitsenko A.V. ,   “Institute of Metallurgy and Ore Beneficiation” JSC; Satbayev University, Burabayeva N.M. ,   “Institute of Metallurgy and Ore Beneficiation” JSC; Satbayev University, Linnik X.A. ,   “Institute of Metallurgy and Ore Beneficiation” JSC; Satbayev University
Published: February 2023

It was established based on the analysis of the results of published works and the results obtained by the authors that there is no information on the behavior and distribution of antimony chalcogenides - Sb2S3, Sb2Se3, Sb2Te3, as well as double systems - Sb2S3-Sb2Se3, Sb2S3-Sb2Te3 and Sb2Se3-Sb2Te3 under the vacuum processing conditions for polymetallic mattes performed at 1100-1250 °C and a vacuum of 15 - 0.7 kPa. It was found based on the saturated vapor pressure values for monochalcogenides that the vapor pressure of free antimony sulfide will be 58.95 kPa at 1100 °C, i.e. the lower limit of the technological interval, which indicates its complete transfer to the vapor phase when the mattes are evacuated; the vapor pressure of free antimony selenide at 1100 °C exceeds the atmospheric pressure value (101.3 kPa), and Sb2Se3 would be completely extracted into the vapor phase in vacuum; the boiling point of liquid antimony telluride at atmospheric pressure corresponds to 971 °C, and it would be extracted into the vapor phase under the conditions of matte evacuation. The thermodynamic evaporation characteristics of antimony chalcogenides were found. It was concluded based on the location of the boundaries of the liquid and vapor phase coexistence fields that it is impossible to separate binary systems of antimony chalcogenides into separate compounds in the process of one evaporation cycle – condensation, in binary systems. Different effects of pressure reduction over melts were found. Lowering the pressure from atmospheric one to 0.7 kPa in Sb2S3-Sb2Se3 system did not change the position of the boundaries of the liquid and vapor fields (L + V) under the temperature; field width (L+V) decreases with decreasing pressure in Sb2S3-Sb2Te3 system; the field width first decreases with temperature, then increases in system Sb2Se3- Sb2Te3. At the same time, the position of the boiling curves of antimony chalcogenide solutions indicates the complete transfer of compounds into the vapor phase under the conditions of matte distillation processing (at 1100-1250 °C) at atmospheric pressure which is important for assessment of the distribution of antimony and rare metals - selenium and tellurium by processed products.
Effect of lesion temperature on the durability of percutaneous radiofrequency rhizotomies to treat trigeminal neuralgia
Authors: Mulford Kellen L. , Darrow David P. , Dharnipragada Rajiv , Woolums Madelyn , Nixdorf Donald R. , Haines Stephen J. , Grande Andrew W.
Published: February 2023

OBJECTIVE

Percutaneous radiofrequency rhizotomy is a common procedure for trigeminal neuralgia (TN) that creates thermocoagulative lesions in the trigeminal ganglion. Lesioning parameters for the procedure are left to the individual surgeon’s discretion, and published guidance is primarily anecdotal. The purpose of this work was to assess the role of lesioning temperature on long-term surgical outcomes.

METHODS

This was a retrospective analysis of patients who underwent percutaneous radiofrequency rhizotomy from 2009 to 2020. Patient data, including demographics, disease presentation, surgical treatment, and outcomes, were collected from medical records. The primary endpoint was the recurrence of TN pain. Univariate and multivariate Cox proportional hazards regressions were used to assess the impact of chosen covariates on pain-free survival.

RESULTS

A total of 280 patients who had undergone 464 procedures were included in the analysis. Overall, roughly 80% of patients who underwent rhizotomy would have a recurrence within 10 years. Lower lesion temperature was predictive of longer periods without pain recurrence (HR 1.05, p < 0.001). The inclusion of lesion time, postoperative numbness, prior history of radiofrequency rhizotomy, surgeon, and multiple sclerosis as confounding variables did not affect the hazard ratio or the statistical significance of this finding. Postoperative numbness and the absence of multiple sclerosis were significant protective factors in the model.

CONCLUSIONS

The study findings suggest that lower lesion temperatures and, separately, postoperative numbness result in improved long-term outcomes for patients with TN who undergo percutaneous radiofrequency rhizotomies. Given the limitations of retrospective analysis, the authors suggest that a prospective multisite clinical trial testing lesion temperatures would provide definitive guidance on this issue with specific recommendations about the number needed to treat and trial design.
Playing Russian Roulette with Alzheimer’s Disease Patients: Do the Cognitive Benefits of Lecanemab Outweigh the Risk of Edema, Stroke and Encephalitis?
Authors: Atwood Craig S. , Perry George
Published: February 2023

The questionable approval of aducanumab and the recent approval of lecanemab (Leqembi; Eisai and Biogen) by the FDA has raised the issue of safety (stroke, meningitis, and encephalitis) over efficacy (slowing of cognitive decline). This communication recounts the important physiological functions of amyloid-β as a barrier protein with unique sealant and anti-pathogenic activities important for maintaining vascular integrity coupled with innate immune functions that prevent encephalitis and meningitis. The approval of a drug that obviates both of these purposive functions increases the risk of hemorrhage, edema and downstream pathogenic outcomes and should be clearly outlined to patients.
The weighted Lindley-G family of probabilistic models: properties, inference, and applications to real-life data
Authors: Alnssyan Badr , Hussein Ekramy A. , Alizadeh Morad , Afify Ahmed Z. , Abdellatif Ashraf D.
Published: February 2023

We propose a new wider family called the weighted Lindley-G family. We derive some mathematical properties and special sub-models of the new family. We address the estimation of the model parameters by eight approaches of estimation. The estimation approaches are ranked and compared by using detailed simulations to develop a guideline for choosing the best approach for estimating the distribution parameters. The potentiality of the new family is illustrated via two applications to real-life data. It is shown that the proposed WLi-G family is more flexible as compared to some of the most cited families in the distribution theory literature such as the exponentiated-G, beta-G, transmuted-G, and alpha-power-G families under the same baseline model.
The Unique Role of Self-Rated Health in Metabolic Syndrome and its Diagnostic Cardiometabolic Abnormalities: An Analysis of Population-Based Data
Authors: Umeh K. , Adaji S. , Graham L.
Published: February 2023

Background: Historically, previous research demonstrating associations between self-rated health (SRH) and metabolic anomalies have rarely controlled for metabolic covariates. Thus, there is currently poor understanding of the unique contribution of SRH to metabolic syndrome (MetS) over and beyond diagnostic cardiometabolic abnormalities. Objective: This study explored unique associations between SRH and multiple cardiometabolic factors, after controlling for metabolic covariates. Methods: This study was based on an analysis of archived population-based data from the 2019 Health Survey for England. A total of 352 MetS cases were extracted from 10299 participants in the survey. Bootstrapped adjusted regression methods were used to predict MetS status and cardiometabolic abnormalities (HDL (high-density lipoprotein) cholesterol, waist/hip ratio, body mass index (BMI), systolic and diastolic blood pressure, and glycated haemoglobin (HbA1c)) from SRH. Structural Equation Modelling (SEM) was used to explore direct and indirect associations between SRH and cardiometabolic factors, with SRH treated as a mediating factor. Results: SRH predicted MetS status but this was negated after cardiometabolic adjustments. Poor SRH independently predicted HDL cholesterol deficiency, and elevated waist/hip ratio, BMI, and HbA1c, even after cardiometabolic adjustments. SEM generated two models with equivalent fit indices, but different structural pathways. In one model SRH mediated relations between anthropometric risk factors (waist/hip ratio and BMI). Conclusions: SRH can help identify people at risk of developing MetS, irrespective of cardiometabolic abnormalities. Poor SRH may represent a non-intrusive easily measurable risk factor for adiposity in MetS, especially where direct measurement of body fat is impractical or socially challenging.
Specific Detection of Physiological S129 Phosphorylated α-Synuclein in Tissue Using Proximity Ligation Assay
Authors: Arlinghaus Ryan , Iba Michiyo , Masliah Eliezer , Cookson Mark R. , Landeck Natalie
Published: February 2023

Background:

Synucleinopathies are a group of neurodegenerative disorders that are pathologically characterized by intracellular aggregates called Lewy bodies. Lewy bodies are primarily composed of α-synuclein (asyn) protein, which is mostly phosphorylated at serine 129 (pS129) when aggregated and therefore used as a marker for pathology. Currently commercial antibodies against pS129 asyn stain aggregates well but in healthy brains cross react with other proteins, thus making it difficult to specifically detect physiological pS129 asyn.

Objective:

To develop a staining procedure that detects endogenous and physiological relevant pS129 asyn with high specificity and low background.

Methods:

We used the fluorescent and brightfield in situ proximity ligation assay (PLA) to specifically detect pS129 asyn in cell culture, mouse, and human brain sections.

Results:

The pS129 asyn PLA specifically stained physiological and soluble pS129 asyn in cell culture, mouse brain sections, and human brain tissue without significant cross-reactivity or background signal. However, this technique was not successful in detecting Lewy bodies in human brain tissue.

Conclusion:

We successfully developed a novel PLA method that can, in the future, be used on in vitro and in vivo samples as a tool to explore and better understand the cellular localization and function of pS129 asyn in health and disease.
Silylation of thymol extracted from Thymus migricus essential oil, improvement of lipophilicity properties, and investigation of its pharmacological properties
Authors: Rezaii Ebrahim , Miardan Leila Nazmi , Mahkam Mehrdad , Rezaii Mohammad
Published: February 2023

Thymus species are well known as medicinal plants because of their biological and pharmacological properties. Thymus migricus Klokov & Desj. -Shos belongs to Lamiaceae. Young branches of this plant produce an essential oil that is abundant in potent and volatile compounds that have a variety of therapeutic uses. In this study, the natural composition of thymol in this plant’s essential oil was first detected with HPLC and Mass, and then the essential oil was extracted. The increase in the lipophilicity of the synthesized silylated derivatives was then examined by HPLC after numerous silylated derivatives of this phenolic compound were synthesized using various silylation reagents. These derivatives were then analyzed by FT-IR and 1HNMR analysis. The antibacterial activity of thymol with its silylated derivatives against gram-negative and gram-positive bacteria was next tested by diffusion method, after which the antioxidant activity of thymol with its silylated derivatives was assessed by two DPPH and FRAP methods.
Outpatient hospital utilization after single event multi-level surgery in children with cerebral palsy
Authors: Greve Kelly R. , Bailes Amy F. , Zhang Nanhua , Long Jason , Aronow Bruce , Mitelpunkt Alexis
Published: February 2023

PURPOSE: This study aimed to examine outpatient hospital utilization (number of specialties seen and number of visits to each specialty) in the year after single event multi-level surgery (SEMLS) in children with cerebral palsy (CP), and to determine if utilization differs across the medical center in the year after compared to the year before SEMLS. METHODS: This retrospective cross-sectional study used electronic medical record data of outpatient hospital utilization in children with CP who underwent SEMLS. RESULTS: Thirty children with CP (Gross Motor Function Classification System Levels I–V, mean age of 9.9 years) were included. In the year after surgery, a significant difference (p = 0.001) was found for the number of specialties seen, with non-ambulatory children seeing more specialties than ambulatory children. No statistically significant difference was found between the number of outpatient visits to each specialty in the year after SEMLS. Compared to the year before SEMLS, fewer therapy visits occurred in the year after SEMLS (p < 0.001) but significantly more visits to orthopaedics (p = 0.001) and radiology (p = 0.001). CONCLUSION: Children with CP had fewer therapy visits but more orthopaedic and radiology visits the year after SEMLS. Nearly half of the children were non-ambulatory. Examination of care needs in children with CP undergoing SEMLS is justified with consideration of ambulatory status, surgical burden, and post-operative immobilization.
Incidence of commuting accidents among non-physician staff in a large French university hospital centre from 2012 to 2016
Authors: Ponsin Alexandre , Fort Emmanuel , Hours Martine , Charbotel Barbara , Denis Marie-Agnès
Published: February 2023

BACKGROUND: Traffic road crashes are the leading cause of fatal crashes at work. The circumstances of work-related road accidents have been a regular focus of study, but there is still a lack of knowledge about commuting accidents. OBJECTIVE: The aims of this study were to estimate the overall incidence of commuting accidents for non-physician professionals in a major French university hospital, by gender and different professional categories, and to assess its evolution over a 5-year period. METHODS: A descriptive analysis was performed on 390 commuting accidents from 2012 to 2016 extracted from the university hospital’s occupational health service. Incidences of commuting accidents were calculated according to gender, occupational categories, and years. Crude relative risk (RR) for the association of commuting accidents with gender, occupational categories, and year of the accident was also estimated using log-binomial regressions. RESULTS: The annual incidence ranged from 354 to 581 accidents per 100,000 employees. Compared with administrative staff, the relative risk (RR) for commuting accidents for service agents was 1.6 (95% confidence interval (CI): 1.1–2.4) and for auxiliary nurses and childcare assistants was 1.3 (95% CI: 1.0–1.9). Nursing executives had a non-significantly lower RR of 0.6 (95% CI: 0.3–1.5). CONCLUSION: The increased risk observed for the auxiliary nurses and childcare assistants and for the service agents may be related in part to the fatigue caused by work schedules, long commuting distances, physical work, and psychological burden.
THE PROBLEMS WITH THE PAY LEVEL AS A FACTOR OF STAFF MOTIVATION IN THE HOSPITALITY INDUSTRY OF UKRAINE
Authors:   National University of Life and Environmental Sciences of Ukraine, Levytska Inna V. , Klymchuk Alona O. ,   State University "Zhytomyr Polytechnic", Kozhushko Svitlana P. ,   Alfred Nobel University
Published: February 2023

The issues of motivation, satisfaction and engagement of employees of the hospitality industry are central to management in the specified area, since business performance in the hospitality industry is characterized by a high level of dependence on the available human capital and, in particular, its personal qualities, skills, professionalism and administrative abilities. That is why it is vitally important for any business entity in the specified field to ensure effective personnel management and the formation of effective systems for its stimulation. The factor of remuneration of the personnel of the hospitality industry is in the field of view of both domestic and foreign scientists, which proves the universality of the specified problem for the global economic sector. However, with all the activity of researchers of the systems and factors of labor motivation in the hospitality industry, little attention is currently paid to the issue of the level of remuneration in the industry, especially in the domestic scientific field. Instead, it is the level of remuneration in the industry as a whole that is not only a motivational factor for certain individuals, but also a significant incentive for its general development, building up personnel potential, reducing the turnover rate, etc. The purpose of the study is to analyze the pay level in the field of hotel and restaurant business as a factor of staff motivation. Methods. The study analyses the pay level of personnel in the hospitality industry, following the data of the official statistics, according to the criteria of gender and profession. Systematization methods are used to select the key indicators in accordance with the selected criteria, the statistical frequency calculation method is applied to develop the distribution series of the studied indicators, as well as the methods of structural analysis and analytical study of data are implemented to process the materials of the domestic job search portal. The results. The article offers a critical review of the research on the pay level in the hotel and restaurant business as a motivational factor for productive work. The study presents a comparative and analytical assessment of the indicators of remuneration of the hospitality industry in relation to other spheres of economic activity. It suggests the constructed interval series of the distribution of the wage index of the employees of the hotel and restaurant business of Ukraine according to the criteria of gender and professional group. The paper provides a structural analysis of employment in the hospitality industry according to the criteria of gender and formal employment. The findings of the research identify the vacancy market of the hospitality industry of Ukraine during the full-scale war and the key problems with wages in the industry.
Review on measuring volatility of cryptocurrencies: 1980-2020
Authors: Satya Sekhar Dr.GUDIMETLA
Published: February 2023

The intensity of volatility persistence is sensitive to time scales, market returns and data regimes. Investors who acquire intangible digital assets in the form of "cryptocurrencies" should consider that they may or may not receive a fiat currency. Sometimes there is a possibility of a loss of the entire investment due to volatility of prices in digital currency/cryptocurrency.

Several empirical studies are conducted to measure the volatility behavior of cryptocurrencies using different mathematical models like: i) Autoregressive Distributed Lag (ARDL) Model, ii) Heterogeneous Autoregressive (HAR) Model, iii) Autoregressive Conditional Heteroskedasticity (ARCH) Model, and iv) Generalized Autoregressive Conditional Heteroscedastic (GARCH) Models.

This paper focuses on the review of various GARCH Models studied during 1980-2020.
What You See Is Not What You Know: Deepfake Image Manipulation
Authors:   Kennesaw State University, Allen Cathryn , Payne Bryson , Abegaz Tanirat , Robertson Chuck
Published: February 2023

Research indicates that deceitful videos tend to spread rapidly online and influence people’s opinions and ideas. Because of this, video misinformation via deepfake video manipulation poses a significant online threat. This study aims to discover what factors can influence viewers’ capability of distinguishing deepfake videos from genuine video footage. This work focuses on exploring deepfake videos’ potential use for deception and misinformation by exploring people’s ability to determine whether videos are deepfakes in a survey consisting of deepfake videos and original unedited videos. The participants viewed a set of four videos and were asked to judge whether the videos shown were deepfakes or originals. The survey varied the familiarity that the viewers had with the subjects of the videos. Also, the number of videos shown at one time was manipulated. This survey showed that familiarity of subjects has a statistically significant impact on how well people can determine a deepfake. Notably, however, almost two thirds of study participants (102 out of 154, or 66.23%) were unable to correctly identify a sequence of just four videos as either genuine or deepfake. Overall, the study provides insights into possible methods for countering disinformation and deception resulting from the misuse of deepfakes.
Towards Assessing Organizational Cybersecurity Risks via Remote Workers’ Cyberslacking and Their Computer Security Posture
Authors:   Nova Southeastern University, Luna Ariel , Levy Yair , Simco Gregory , Li Wei
Published: February 2023

Cyberslacking is conducted by employees who are using their companies’ equipment and network for personal purposes instead of performing their work duties during work hours. Cyberslacking has a significant adverse effect on overall employee productivity, however, recently, due to COVID19 pandemic move to remote working also pose a cybersecurity risk to organizations networks and infrastructure. In this work-in-progress research study, we are developing, validating, and will empirically test taxonomy to assess an organization’s remote workers’ risk level of cybersecurity threats. This study includes a three-phased developmental approach in developing the Remote Worker Cyberslacking Security Risk Taxonomy. With feedback from cybersecurity Subject Matter Experts (SMEs) on the taxonomy and measures, we then plan to use the taxonomy to assess organizational remote workers’ risk level of cybersecurity threats by using actual system indicators of productivity measures to estimate their cyberslacking along with assessing the computer security posture of the remote device being used to access organizational resources. Anticipated results from 125 anonymous employees will then be assessed on the proposed novel taxonomy where recommendation to the organizational cybersecurity leadership will be provided.
ПОПЕРЕДЖЕННЯ КОРУПЦІЇ В СИСТЕМІ ФІНАНСОВОГО МОНІТОРИНГУ: ІНСТИТУЦІЙНИЙ ПІДХІД.
Authors: Волоснікова Н.М. , Сержанов В.В. , Абрамов Ф.В.
Published: February 2023

В даній статті розглядаються інституційні чинники виникнення корупції в системі фінансового моніторингу та шляхи підвищення ефективності заходів попередження бюрократичної та не бюрократичної (кримінальної) корупції. Показано, що чинниками, що сприяють виникненню корупції в системі фінансового моніторингу є: високий рівень трансакційних витрат бюрократичних процедур та широкі дискреційні повноваження чиновників. Запропоновано, для попередження бюрократичної корупції застосовувати делегування функцій фінансового моніторингу учасникам ринку, що здатні їх реалізувати з найменшими трансакційними витратами. Показано, що у випадку не бюрократичної корупції вибір заходів попередження корупції залежить від типу безпосередньої діяльності клієнта. У випадку коли клієнтом обирається незаборонений вид діяльності, для попередження не бюрократичної корупції має застосовуватися делегування функцій фінансового моніторингу учасникам ринку, що здатні їх реалізувати з найменшими трансакційними витратами бюрократичних процедур. У випадку коли клієнтом обирається заборонений вид діяльності перевага має надаватися репресивним антикорупційним заходам.
МАРКЕТИНГ ЕЛЕКТРОННИХ КОМУНІКАЦІЙ В УМОВАХ ЦИФРОВОЇ ЕКОНОМІКИ
Authors: Стрій Л.О. , Захарченко Л.А.
Published: February 2023

У статті викладено результати вивчення сучасного стану та напрямів розвитку маркетингу електронних комунікацій. Розглянуто економіко-технологічні процеси, що впливають на розвиток маркетингу комунікацій. Розроблено та представлено схему моделі системи взаємних зв'язків маркетингу. Усі організації системи забезпечені взаємними зв'язками за допомогою цифрових каналів електронних комунікацій. Головна мета маркетингу електронних комунікацій повністю відповідає меті традиційного маркетингу: націлювати підприємства на отримання прибутку, що може забезпечити не тільки виживання підприємства в умовах ринкової конкуренції, а й його стабільний розвиток у довгостроковій перспективі. Орієнтація маркетингу електронних комунікацій (як і інших сфер економіки) безперервно змінювалася, адаптуючись до ринкових умов, що змінюються, спрямовуючи виробника на пріоритети, які є найактуальнішими в той чи інший період.
Pengaplikasian Sensor Arus ACS712 Sebagai Sistem Proteksi Pada Alat Penghitung Kertas Otomatis Berbasis IoT
Authors: Alviero Andreas Lie , Setiawan Nugroho Dimas
Published: February 2023

Alat penghitung kertas yang sudah ada pada umumnya sudah bisa melakukan perhitungan kertas. Namun pada alat yang sudah ada, belum terdapat sistem proteksi untuk kertas yang tersangkut pada saat  kertas ditarik oleh roller.  Tujuan dari penelitian ini adalah melakukan karakterisasi dan juga pengujian sensor arus ACS712 untuk diaplikasikan ke sistem proteksi alat penghitung kertas otomatis. Metode yang digunakan pada penelitian ini adalah dengan kalibrasi dan pengujian sensor arus ACS712 dan juga pengujian sistem secara keseluruhan. Pengambilan data dilakukan dengan menggunakan 4 jenis motor DC yang berbeda dan dikombinasikan. Hasil penelitian menunjukan bahwa sensor arus ACS712 memiliki linieritas yang tinggi antara nilai keluaran sensor yang berupa tegangan dan nilai arus yang terukur pada ampermeter dengan tingkat linieritas 99,3%.  Pengujian sensor menunjukan sensor arus ACS712 memiliki tingkat akurasi rata-rata sebesar 97,18%.  Berdasarkan hasil pengujian sistem secara keseluruhan, sensor arus mampu mendeteksi kenaikan arus yang diakibatkan beban kerja yang meningkat pada motor DC akibat adanya kertas yang tersangkut. Pada saat arus yang terukur pada sensor melebihi arus normal yaitu 373,16 mA, maka sistem akan berhenti berjalan dan menghitung.
Analisis Kemampuan Penalaran Matematis Siswa Kelas XI-MIA MAN 1 Kota Ternate dalam Menyelesaikan Masalah Matematis pada Materi Matriks
Authors: Adam Yumna , Afandi Ahmad , Tamrin Marwia
Published: February 2023

Penelitian deskriptif kualitatif ini bertujuan untuk mendeskripsikan kemampuan penalaran matematis siswa kelas XI-MIA MAN 1 Kota Ternate dalam menyelesaikan masalah matematika pada matriks. Pengumpulan data kemampuan penalaran matematis siswa menggunakan teknik tes, wawancara, dan dokumentasi. Instrument tes yang digunakan adalah soal uraian yang berjumlah 3 butir soal kemampuan penalaran matematis yang telah divalidasi. Data yang dikumpulkan dianalisis secara kualitatif dengan cara mereduksi, penyajian, dan penarikan kesimpulan. Subjek penelitian ini adalah siswa kelas XI-MIA MAN 1 Kota Ternate sebanyak 8 siswa, kemudian menganalisis 8 subjek penelitian berdasarkan kategori kemampuan penalaran matematis dan diwawancarai. Hasil penelitian menunjukkan bahwa kualifikasi kemampuan penalaran matematis dalam kategori sangat baik dicapai oleh 4 siswa (50%) yang mampu: memperkirakan jawaban dan proses solusi, menyusun pembuktian langsung, serta mampu menarik kesimpulan logis terhadap penyelesaian soal matriks. Selanjutnya, kategori baik hanya dicapai oleh 1 siswa (12,5%) yang mampu: memperkirakan jawaban dan proses solusi namun kurang lengkap, menyusun pembuktian langsung, dan menarik kesimpulan logis dari penyelesaian soal matriks. Kemudian terdapat 3 siswa (37,5%) mencapai kategori cukup mampu: memperkirakan jawaban dan proses solusi namun kurang benar dan kurang lengkap, tidak mampu menyelesaikan pembuktian langsung, dan tidak dapat menarik kesimpulan logis karena penyelesaiannya kurang lengkap. Selanjutnya tidak ada siswa yang berkemampuan penalaran matematis dalam kategori kurang dan sangat kurang.
Analisis Kesalahan Siswa Kelas VII SMP dalam Menyelesaikan Soal pada Materi Bentuk Aljabar
Authors: Abdul Fahmi , Afandi Ahmad , Abdullah In Hi
Published: February 2023

Penelitian ini bertujuan untuk mengetahui kesalahan-kesalahan yang dilakukan siswa kelas VII SMP Negeri 5 Kota Ternate dalam menyelesaikan soal matematika pada materi bentuk aljabar. Dalam penelitian ini terpilih subjek penelitian sebanyak 4 siswa yang ditentukan berdasarkan hasil tes. Siswa yang terpilih sebagai subjek penelitian tersebut adalah siswa yang memperoleh kategori rendah dan sangat rendah. Data yang dikumpulkan dengan metode tes dan wawancara. Tes digunakan untuk menganalisis kesalahan siswa dan wawancara digunakan untuk menelusuri jenis kesalahan siswa secara mendalam. Metode analisis data yang digunakan adalah kualitatif. Berdasarkan hasil penelitian dapat disimpulkan bahwa terdapat 1 siswa (5%) mencapai kesalahan dengan kategori tinggi, 4 siswa (20%) mencapai kesalahan dengan kategori sedang, 9 siswa (45%) mencapai kesalahan dengan kategori rendah dan 6 siswa (30%) mencapai kesalahan dengan kategori sangat rendah dalam menyelesaikan soal pada materi bentuk aljabar. Berdasarkan hasil kerjanya, subjek tersebut salah dalam menuliskan simbol, lambang, atau huruf dalam menyelesaikan soal (kesalahan fakta), tidak dapat menuliskan rumus, atau tidak memahami konsep operasi (kesalahan konsep), salah dalam menggunakan teorema atau definisi dalam menyelesaikan soal (kesalahan prinsip) dan salah dalam melakukan perhitungan (kesalahan operasi), terhadap permasalahan pada soal bentuk aljabar. Kesalahan yang dilakukan siswa kelas VII SMP Negeri 5 Kota Ternate dalam menyelesaikan soal matematika pada materi bentuk aljabar yaitu meliputi: 1) kesalahan fakta yang dilakukan oleh SP-8 soal nomor 2, SP-9 soal nomor 1 dan SP-18 soal nomor 1 dan 2 dengan kesalahan yaitu, salah dalam menuliskan simbol, lambang, atau huruf dalam menyelesaikan soal. 2) kesalahan konsep yang dilakukan SP-8 soal nomor 2, SP-10 soal nomor 1, dan SP-18 soal nomor 2 dengan kesalahan yaitu, tidak dapat menuliskan rumus, atau tidak memahami konsep operasi. 3) kesalahan prinsip yang dilakukan oleh SP-8 pada soal nomor 1 dengan kesalahan yaitu salah dalam menggunakan teorema atau definisi dalam menyelesaikan soal. 4) kesalahan operasi yang dilakukan oleh SP-9 pada soal nomor 1 dan SP-18 pada soal nomor 1 dengan kesalahan yaitu salah dalam melakukan perhitungan.
Analisis Kemampuan berpikir Komputasi Matematis Siswa SMP pada Materi Persamaan Kuadrat
Authors: Jamna Nilam D. , Hamid Hasan , Bakar Marwia Tamrin
Published: February 2023

Penelitian ini bertujuan untuk mendeskripsikan dan menganalisis kemampuan berpikir komputasi matematis siswa kelas IX SMP Negeri 5 Kota Ternate. Jenis penelitian ini adalah kualitatif. Subjek penelitian ini adalah siswa kelas IX SMP Negeri 5 Kota Ternate yang berjumlah 20 orang siswa.Â  Metode pengumpulan data yang digunakan adalah tes, wawancara, dan doumentasi. Teknik analisis data pada penelitian ini adalah reduksi data, paparan data, dan penarikan kesimpulan. Hasil penelitian kemampuan berpikir komputasi matematis siswa pada materi persamaan kuadrat dapat dikelompokan sebagai berikut sebanyak 1 orang atau (5%) dengan kategori berkemampuan sangat tinggi, sebanyak 2 orang atau (10%) dengan kategori berkemampuan tinggi, sebanyak 7 orang atau (35%) dengan kemampuan kategori sedang, dan sebanyak 10 orang atau (50%) dengan kemampuan berkategori rendah. Dari hasil penelitian Peserta didik pada kategori tinggi sudah mampu memenuhi semua indikator, pada peserta didik dengan kategori cukup sudah mampu memenuhi soal dengan indikator Decomposition dan Pettern recognition namun kurang pada indikator Algorithms dan Debugging, sedangkan pada Peserta didik dengan kemampuan berkategori rendah, kurang mampu dalam memenuhi indikator Decomposition, Pettern recognition. Algorithms, dan Debugging.
Pembuatan Ornamen Geometris dengan Software Geometri Dinamis
Authors: Suratno Joko , Waliyanti Ida Kurnia
Published: February 2023

Ornamen atau pola-pola geometri di sekitar tempat tinggal kita jumlahnya sangat banyak. Di lain pihak, pemanfaatan ornamen-ornamen tersebut dalam pembelajaran matematika khususnya geometri masih sangat terbatas. Pola-pola geometris atau ornamen-ornamen yang ada sebenarnya dapat dijadikan sebagai sumber pembelajaran matematika yang sarat akan kreativitas. Siswa yang belajar dengan sarana ornamen-ornamen tersebut akan menjadi lebih aktif dan meningkat ketertarikannya terhadap materi yang diajarkan. Selain itu, pembelajaran dengan media ornamen akan meningkatkan kreativitas siswa dalam membuat ornamen-ornamen baru, membuat permasalahan, dan menyelesaikannya dengan berbagai pendekatan. Software geometri Interaktif atau Interactive Geometry Software (IGS) disebut juga Dynamic Geometry Environments (DGEs) merupakan program komputer yang memungkinkan penggunanya untuk membuat dan memanipulasi objek-objek geometris. Cabri II Plus merupakan salah satu contoh IGS yang khusus pada program dua dimensi dari sekitar 30an software sejenis. Software geometri interaktif ini memiliki beberapa kelebihan antara lain dapat membuat belajar geometri lebih bermakna, dapat membenarkan beberapa kesalahan konsep, dan kemampuan grafis dan numeris dari komputer juga menyediakan lingkungan pembelajaran yang kaya sehingga siswa dapat bereksperimen secara leluasa. Pengalaman eksplorasi dengan menggunakan software ini juga memberikan efek yang bagus dalam pemecahan masalah. Selain hal tersebut, bekerja dengan software geometri interaktif memiliki beberapa keuntungan jika dibandingkan dengan bekerja secara manual, antara lain dalam hal ketepatan dan waktu.
Recanalization Rate and Clinical Outcomes of Intravenous Tissue Plasminogen Activator Administration for Large Vessel Occlusion Stroke Patients
Authors: Lee Min-Hyung , Im Sang-Hyuk , Jo Kwang Wook , Yoo Do-Sung
Published: February 2023

Objective : Stroke caused from large vessel occlusion (LVO) has emerged as the most common stroke subtype worldwide. Intravenous tissue plasminogen activator administration (IV-tPA) and additional intraarterial thrombectomy (IA-Tx) is regarded as standard treatment. In this study, the authors try to find the early recanalization rate of IV-tPA in LVO stroke patients.Methods : Total 300 patients undertook IA-Tx with confirmed anterior circulation LVO, were analyzed retrospectively. Brain computed tomography angiography (CTA) was the initial imaging study and acute stroke magnetic resonance angiography (MRA) followed after finished IV-tPA. Early recanalization rate was evaluated by acute stroke MRA within 2 hours after the IV-tPA. In 167 patients undertook IV-tPA only and 133 non-recanalized patients by IV-tPA, additional IA-Tx tried (IV-tPA + IA-Tx group). And 131 patients, non-recanalized by IV-tPA (IV-tPA group) additional IA-Tx recommend and tried according to the patient condition and compliance.Results : Early recanalization rate of LVO after IV-tPA was 12.0% (36/300). In recanalized patients, favorable outcome (modified Rankin Scale, 0–2) was 69.4% (25/36) while it was 32.1% (42/131, p<0.001) in non-recanalized patients. Among 133 patients, nonrecanalized after intravenous recombinant tissue plasminogen activator and undertook additional IA-Tx, the clinical outcome was better than not undertaken additional IA-Tx (favorable outcome was 42.9% vs. 32.1%, p=0.046). Analysis according to the perfusion/diffusion (P/D)-mismatching or not, in patient with IV-tPA with IA-Tx (133 patients), favorable outcome was higher in P/ D-mismatching patient (52/104; 50.0%) than P/D-matching patients (5/29; 17.2%; p=0.001). Which treatment tired, P/D-mismatching was favored in clinical outcome (iv-tPA only, p=0.008 and IV-tPA with IA-Tx, p=0.001).Conclusion : The P/D-mismatching influences on the recanalization and clinical outcomes of IV-tPA and IA-Tx. The authors would like to propose that we had better prepare IA-Tx when LVO is diagnosed on initial diagnostic imaging. Furthermore, if the patient shows P/D-mismatching on MRA after IV-tPA, additional IA-Tx improves treatment results and lessen the futile recanalization.
The Relationship Between Tinnitus Frequency and Speech Discrimination in Patients With Hearing Loss
Authors: Oh Joo Hyung , Lim Taehun , Joo Joon Bum , Cho Ju Eun , Park Pona , Kim Jong Yang
Published: February 2023

Background and Objectives Patients with hearing loss and tinnitus experience difficulty in engaging in daily conversations. However, only few studies have examined how tinnitus affects individual speech discrimination to comprehend speech. This study aimed to analyze the correlation between tinnitus frequency and speech discrimination in patients with hearing loss and tinnitus.Subjects and Method A total of 275 ears with hearing impairment were retrospectively analyzed via audiometry and tinnitogram. The ears were divided into three groups depending on the frequency of their tinnitus. Average pure tone audiometry (PTA), hearing threshold of tinnitus frequency, speech discrimination test (SDT), degree of discrepancy between tinnitus frequency and worst PTA frequency were collected and compared among the three groups.Results No significant difference was observed in PTA in the three patient groups. Hearing threshold of tinnitus frequency was the highest at 78.27 dB in the high-frequency group and the lowest at 45.14 dB in the low-frequency group. SDT was significantly lower (53.69%) in the low-frequency group. The correlation between tinnitus loudness and SDT was the strongest in the low-frequency group. The degree of discrepancy between tinnitus frequency and worst PTA frequency was also significantly observed in the low-frequency group.Conclusion Patients who are severely affected by tinnitus are found to have significant discrepancy between tinnitus frequency and worst PTA frequency, indicating decreased SDT.
Hearing Rehabilitation Experiences With Osia®2 Bone Conduction Hearing Implant in Patients With Iatrogenic Unilateral Hearing Loss
Authors: Moon SeoJin , Moon In Seok
Published: February 2023

Various types of bone conduction hearing aids have been widely used for hearing rehabilitation for the last 30 years. Among them, the recently launched Osia®2 system is a new active transcutaneous bone conduction implant system using piezoelectric effect. This can be expected to deliver more efficient sound transmission, overcome sound attenuation, and improve high-frequency hearing than conventional passive transcutaneous hearing aids, and is considered to be cosmetically superior to percutaneous hearing aids. Recently, we experienced two cases of Osia®2 implantation in patients with iatrogenic unilateral hearing loss. Both patients showed improved pure tone threshold and better Korean Hearing in Noise Test (K-HINT) score after implantation. Furthermore, all of them had no complications after Osia®2 implantation.
Machine Learning Algorithms for Predicting Treatment Outcomes of Oropharyngeal Cancer After Surgery
Authors: Kim Dachan , Kim Se-Heon , Choi Eun Chang , Lim Jae-Yol , Koh Yoon Woo , Park Young Min
Published: February 2023

Background and Objectives This study analyzed data from patients who were diagnosed with human papilloma virus (HPV)-associated oropharyngeal (OPC) and treated surgically to construct a machine learning survival prediction model.Subjects and Method We retrospectively analyzed the clinico-pathological data of 203 patients with HPV-associated oropharyngeal squamous cell carcinoma (OPSCC) from 2007 to 2015.Results In the Cox proportional hazard (CPH) model, the c-index values for the training set and the test set were 0.81 and 0.59, respectively. The univariate analysis showed that contralateral lymph nodes (LNs) metastasis, lymphovascular invasion, pN, stage, surgical margin status, histologic grade, pT, and the number of metastatic LNs had significant correlations with survival. Contrastively, the multivariate analysis showed pT and histologic grade to have significant correlation with survival. In the random survival forest model, the c-index values for the training set and the test set were 0.83 and 0.87, respectively. In the DeepSurv model, the cindex values for the training set and the test set were 0.75 and 0.83. Among the three models mentioned above, Random Survival Forest and DeepSurv showed the best performance for predicting the survival of HPV-associated OPSCC patients.Conclusion We confirmed that a survival prediction model using machine learning and deep learning algorithms showed reasonable survival estimates for HPV-associated OPSCC patients.
Пеностеклокерамическая теплоизоляция для жилищного строительства на арктических и субарктических территориях
Authors: ВЕДЯКОВ Иван Иванович , ВАСКАЛОВ Владимир Федорович , МАЛЯВСКИЙ Николай Иванович , БАЖИНА Елена Витальевна , ВЕДЯКОВ Михаил Иванович
Published: February 2023

Представлена новая технология термического получения щелочно-силикатной гранулированной стеклокерамической теплоизоляции. В качестве сырьевых материалов используются горные породы кремнеземистого или алюмосиликатного состава, стеклообразный щелочной силикат (с добавкой карбоната и гидроксида) и углеродсодержащий порообразователь. Часть кремнеземистого компонента входит также в состав связующего раствора, что дает возможность повысить значение силикатного модуля и степень закрытости пор. Этот фактор, а также повышенное содержание оксида алюминия в кремнийсодержащем сырье позволяют получать пеноматериал с высокой прочностью и водостойкостью. Процесс вспенивания сырьевых гранул происходит при высоких температурах, что приводит к закрытию образовавшихся открытых пор и к формированию новых пор под действием пенообразователя сразу в закрытом состоянии. Это вносит дополнительный вклад в повышение водостойкости и морозостойкости гранул, а также значительно снижает их теплопроводность и водопоглощение. Незначительная потеря массы образцов при кипячении в воде ставит полученные пеноматериалы в один ряд с наиболее водостойкими из известных в настоящее время. Учитывая суровый климат и наличие многих месторождений кремнеземного, силикатного и алюмосиликатного сырья, развитие этого направления для строительной отрасли в арктических и субарктических регионах имеет особые перспективы.
COVID-19 Kısıt ve Tedbirlerine Dönük Toplumsal Muhalefeti Haritalandırmak
Authors: ÇOBAN Funda
Published: February 2023

Toplumsal yaşam, gündelik hayatın süreğenliğine koşullu bir yapıdır. Bu yapının akışı, egemen iktidar yapılarının iktisadi, siyasi, hukuki veya idari uygulamalarıyla kesintiye uğradığında veya askıya alındığında çeşitli muhalefet biçimleri ortaya çıkar. COVID-19 pandemisinin önlenmesi ve kontrol altına alınması sürecinde devletler tarafından uygulanan kısıtlama ve tedbirler dünyanın farklı yerlerinde eylemliliklerin doğmasına yol açmıştır. Bu açıdan çalışma, devletlerin siyasi ve idari aygıtları harekete geçirerek pandeminin kontrol altına alınması için devreye soktuğu tedbir, kısıtlama ve yasaklamaların başlangıcından -Mart 2020- Temmuz 2021 dönemine dek ortaya çıkan eylemlilikleri gerekçeler, aktörler, örgütlenme biçimleri ve eylem repertuvarları açısından incelemekte ve sınıflandırmaktadır. Çalışmanın verileri literatür taraması yanında, yeni ve dinamik bir süreci ele aldığı oranda gözlemlerden, gazete ve internet taramalarından toplanmıştır. Veriler ise nitel araştırma yöntemiyle yorumsamacı paradigma çerçevesinde ve gerektiğinde söylem analizi yapılarak değerlendirilmektedir. Bu itibarla çalışma, konuyla ilgili bilimsel araştırmaların kısıtlılık ve dağınıklığı söz
konusuyken geniş bir veri tabanını bir araya getirerek yaptığı sınıflama ve analizle, Covid sürecindeki toplumsal eylemliliklerle ilgili literatür birikimine katkı sağlamaktadır.
Intra- and inter-subject variability of femoral growth plate stresses in typically developing children and children with cerebral palsy
Authors: Koller Willi , Gonçalves Basílio , Baca Arnold , Kainz Hans
Published: February 2023

Little is known about the influence of mechanical loading on growth plate stresses and femoral growth. A multi-scale workflow based on musculoskeletal simulations and mechanobiological finite element (FE) analysis can be used to estimate growth plate loading and femoral growth trends. Personalizing the model in this workflow is time-consuming and therefore previous studies included small sample sizes (N < 4) or generic finite element models. The aim of this study was to develop a semi-automated toolbox to perform this workflow and to quantify intra-subject variability in growth plate stresses in 13 typically developing (TD) children and 12 children with cerebral palsy (CP). Additionally, we investigated the influence of the musculoskeletal model and the chosen material properties on the simulation results. Intra-subject variability in growth plate stresses was higher in cerebral palsy than in typically developing children. The highest osteogenic index (OI) was observed in the posterior region in 62% of the TD femurs while in children with CP the lateral region was the most common (50%). A representative reference osteogenic index distribution heatmap generated from data of 26 TD children’s femurs showed a ring shape with low values in the center region and high values at the border of the growth plate. Our simulation results can be used as reference values for further investigations. Furthermore, the code of the developed GP-Tool (“Growth Prediction-Tool”) is freely available on GitHub (https://github.com/WilliKoller/GP-Tool) to enable peers to conduct mechanobiological growth studies with larger sample sizes to improve our understanding of femoral growth and to support clinical decision making in the near future.
Produce D-allulose from non-food biomass by integrating corn stalk hydrolysis with whole-cell catalysis
Authors: Jia Qing , Zhang Hui , Zhao Anqi , Qu Lingbo , Xiong Wenlong , Alam Md. Asraful , Miao Jixing , Wang Weigao , Li Feihu , Xu Jingliang , Lv Yongkun
Published: February 2023

D-allulose is a high-value rare sugar with many health benefits. D-allulose market demand increased dramatically after approved as generally recognized as safe (GRAS). The current studies are predominantly focusing on producing D-allulose from either D-glucose or D-fructose, which may compete foods against human. The corn stalk (CS) is one of the main agricultural waste biomass in the worldwide. Bioconversion is one of the promising approach to CS valorization, which is of significance for both food safety and reducing carbon emission. In this study, we tried to explore a non-food based route by integrating CS hydrolysis with D-allulose production. Firstly we developed an efficient Escherichia coli whole-cell catalyst to produce D-allulose from D-glucose. Next we hydrolyzed CS and achieved D-allulose production from the CS hydrolysate. Finally we immobilized the whole-cell catalyst by designing a microfluidic device. Process optimization improved D-allulose titer by 8.61 times, reaching 8.78 g/L from CS hydrolysate. With this method, 1 kg CS was finally converted to 48.87 g D-allulose. This study validated the feasibility of valorizing corn stalk by converting it to D-allulose.