bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of the specificity of a COVID-19 antigen test in the Slovak mass testing program
Authors: Hledík Michal , Polechová Jitka , Beiglböck Mathias , Herdina Anna Nele , Strassl Robert , Posch Martin 
Published: July 2021

Aims
Mass antigen testing programs have been challenged because of an alleged insufficient specificity, leading to a large number of false positives. The objective of this study is to derive a lower bound of the specificity of the SD Biosensor Standard Q Ag-Test in large scale practical use.

Methods
Based on county data from the nationwide tests for SARS-CoV-2 in Slovakia between 31.10.–1.11. 2020 we calculate a lower confidence bound for the specificity. As positive test results were not systematically verified by PCR tests, we base the lower bound on a worst case assumption, assuming all positives to be false positives.

Results
3,625,332 persons from 79 counties were tested. The lowest positivity rate was observed in the county of Rožňava where 100 out of 34307 (0.29%) tests were positive. This implies a test specificity of at least 99.6% (97.5% one-sided lower confidence bound, adjusted for multiplicity).

Conclusion
The obtained lower bound suggests a higher specificity compared to earlier studies in spite of the underlying worst case assumption and the application in a mass testing setting. The actual specificity is expected to exceed 99.6% if the prevalence in the respective regions was non-negligible at the time of testing. To our knowledge, this estimate constitutes the first bound obtained from large scale practical use of an antigen test.
Forecasting suicide rates in India: An empirical exposition
Authors: Swain Prafulla Kumar , Tripathy Manas Ranjan , Priyadarshini Subhadra , Acharya Subhendu Kumar 
Published: July 2021

IntroductionSuicide is a major social and health issue in India. Yearly statistics show a concerning increasing pattern of suicidal deaths in India which is higher in comparison to the global trend. There is limited evidence regarding historical analysis of suicide or any forecasting for suicide in India towards predicting the possible risks of death due to suicide.MethodsThis paper examines the trend of suicide rate and characteristics of suicide victims in India, based on the longitudinal time series data over the last 50 years—collected from the National Crime Record Bureau Reports (1969 to 2018) of the Government of India. In our analysis, we have used the time series model to forecast the suicide rates in India for the next decade. ARIMA (4,1,0) model is found to be the best fit model for forecasting the data.FindingsThere has been an observable and rising trend of suicide rates in India over the last five decades. The forecast indicates a continuance of rising suicide cases for an upcoming couple of years in India with a limited decline in the following years. The prediction model indicates a future relatively consistent pattern of suicide in India which does not seem to be a very encouraging trend. As we have not included the period staring the year 2020 onwards affected by Covid-19 and which has several disruptions in personal and family spaces, the projected suicide trend during the period of next two to three years (2020–22) may rise far high and then it may show a declining path. Along with this, there is a shift in means of suicide in the last couple of decades. Constituting the second-highest number of cases, Illness associated suicide was visibly a serious concern.ConclusionThe present analysis finds that there is no visible substantial relief for suicide deaths during the coming years in India. On the other hand, more extensive exploration of sample cases may provide important information for suicide prevention. Availability of detailed and more inclusive data will be highly useful for analysis and suicide preventive policies. Investment in public health care and other welfare activities like education and employment generation will yield visible positive results in suicide control.
Experiences of people with opioid use disorder during the COVID-19 pandemic: A qualitative study
Authors: Galarneau Lexis R. , Hilburt Jesse , O’Neill Zoe R. , Buxton Jane A. , Scheuermeyer Frank X. , Dong Kathryn , Kaczorowski Janusz , Orkin Aaron M. , Barbic Skye Pamela , Bath Misty , Moe Jessica , Miles Isabelle , Tobin Dianne , Grier Sherry , Garrod Emma , Kestler Andrew 
Published: July 2021

Aim
To capture pandemic experiences of people with opioid use disorder (OUD) to better inform the programs that serve them.

Design
We designed, conducted, and analyzed semi-structured qualitative interviews using grounded theory. We conducted interviews until theme saturation was reached and we iteratively developed a codebook of emerging themes. Individuals with lived experience of substance use provided feedback at all steps of the study.

Setting
We conducted phone or in-person interviews in compliance with physical distancing and public health regulations in outdoor Vancouver parks or well-ventilated indoor spaces between June to September 2020.

Participants
Using purposive sampling, we recruited participants (n = 19) who were individuals with OUD enrolled in an intensive community outreach program, had visited one of two emergency departments, were over 18, lived within catchment, and were not already receiving opioid agonist therapy.

Measurements
We audio-recorded interviews, which were later transcribed verbatim and checked for accuracy while removing all identifiers. Interviews explored participants’ knowledge of COVID-19 and related safety measures, changes to drug use and healthcare services, and community impacts of COVID-19.

Results
One third of participants were women, approximately two thirds had stable housing, and ages ranged between 23 and 59 years old. Participants were knowledgeable on COVID-19 public health measures. Some participants noted that fear decreased social connection and reluctance to help reverse overdoses; others expressed pride in community cohesion during crisis. Several participants mentioned decreased access to housing, harm reduction, and medical care services. Several participants reported using drugs alone more frequently, consuming different or fewer drugs because of supply shortages, or using more drugs to replace lost activities.

Conclusion
COVID-19 had profound effects on the social lives, access to services, and risk-taking behaviour of people with opioid use disorder. Pandemic public health measures must include risk mitigation strategies to maintain access to critical opioid-related services.
Resistance of Rice Varieties and Accessions to Dwarf Viruses
Authors: Roza Celvia , Suprihanto Suprihanto , Kusdiaman Dede , Widiarta I Nyoman , Nuryanto Bambang , Rumasa Oco 
Published: July 2021

Identifikasi ketahanan plasma nutfah padi terhadap virus kerdil bertujuan untuk mendapatkan informasi mengenai varietas dan aksesi yang tahan terhadap virus kerdil padi, yaitu Rice ragged stunt virus (RRSV) dan Rice grassy stunt virus (RGSV). Penelitian dilakukan di Rumah Kaca Balai Besar Penelitian Tanaman Padi pada MT1/MT2 tahun 2018. Materi genetik yang diuji yaitu 19 varietas padi yang sudah dilepas dan 50 aksesi plasma nutfah padi koleksi Balai Besar Penelitian Tanaman Padi Badan Litbang Pertanian-Kementerian Pertanian. Pengamatan mengikuti metode skoring SES IRRI 2014. Respons tanaman uji terhadap RRSV dapat dikelompokkan menjadi rentan (1 varietas dan 22 aksesi), agak tahan (18 varietas dan 22 aksesi), dan tahan {2 aksesi, yaitu MDK Karawang (800 butir/Malai) (10597), dan Pulo Hitam (10615}. Respons tanaman uji terhadap RGSV dapat dikelompokkan menjadi rentan (16 varietas dan 34 aksesi), agak tahan (3 varietas dan 11 aksesi), dan tahan (1 aksesi, yaitu Ketik 1-1062). Lebih lanjut, aksesi padi yang tahan terhadap RRSV dan/atau RGSV dapat digunakan sebagai tetua dalam perakitan varietas yang tahan terhadap virus kerdil.
DESAIN SISTEM INFORMASI UNTUK TRACKING DAN TRACING PADA WAREHOUSE DENGAN MENGGUNAKAN TEKNOLOGI QR CODE
Authors: Adiwinoto Ivan Taufan 
Published: July 2021

Industrial Revolution 4.0 menyebabkan pelaku supply chain untuk dapat terus beradaptasi dengan teknologi agar tetap kompetitif. Salah satu cara yang dapat digunakan bagi pelaku supply chain adalah dengan menerapkan teknologi IoT untuk membantu memudahkan pelaku supply chain dalam melakukan proses tracking dan tracing inventory. Dengan adanya IoT ini, seluruh pergerakan mulai dari proses penerimaan inventory sampai proses pengeluaran inventory dapat tercatat secara sistem online. Proses tracking dan tracing ini bertujuan untuk membantu mengetahui posisi dari inventory pada warehouse dan memastikan jika inventory dikeluarkan mengikuti aturan FIFO. Desain sistem berbasis IoT ini dibuat dengan menggunakan metode pendekatan System Development Live Cycle (SDLC) sampai pada tahapan desain sistem. Hasil akhir dari studi ini adalah desain sistem informasi yang menggunakan teknologi IoT dan QR code untuk proses tracking dan tracing inventory di dalam warehouse. Dengan adanya sistem informasi ini, jumlah inventory yang kadaluarsa dapat menurun. Abstract[Information System Design for Tracking and Tracing Using QR Code in Warehouse] Industrial Revolution 4.0 causes supply chain player to continue adapting technology to stay competitive. One way for supply chain player is by implementing Internet of Things (IoT) for tracking dan tracing inventory in supply chain process. With IoT, all inventory movement and activity from inbound area to outbound area can be recorded by system. This tracking and tracing process aim to help determine the position of the inventory in warehouse and ensure the issued inventory is following FIFO rules. This IoT-based system created using System Development Live Cycle (SDLC) approach up to system design step. The result of this study is an information system design that uses IoT and QR code technology for tracking and tracing inventory in warehouse. With this information system, the amount of expired inventory can decrease.Keyword: supply chain; tracing; tracking; QR code
PENILAIAN RISIKO TERHADAP POSTUR KERJA PADA PEKERJA PABRIK KARET INDONESIA
Authors: Ihsan Taufiq , Silvia Shinta , Derosya Vioni , Edwin Tivany , Dewi Mita Sari 
Published: July 2021

Keluhan nyeri muskuloskeletal sering terjadi di tiga pabrik karet remah terbesar yang berlokasi di Padang, Indonesia. Penelitian ini bertujuan untuk menganalisis postur kerja menggunakan metode Rapid Entire Body Assessment (REBA) untuk pekerja di area produksi. Pengambilan data postur karyawan menggunakan bantuan kamera video serta lembar observasi. Responden dalam penelitian ini terdiri dari 135 pekerja area produksi basah dan 213 pekerja area produksi kering. Penilaian REBA menunjukkan bahwa 72,34% dari pekerjaan yang diperiksa termasuk dalam kategori risiko menengah. Skor REBA tertinggi di area produksi basah adalah dalam proses pengeringan alami. Sebaliknya, di area produksi kering, skor REBA tertinggi adalah dalam proses mengangkat kontainer dari truk. Berdasarkan Standar Indonesia No.7269 / 2009 tentang perhitungan beban kerja, ini menunjukkan bahwa pekerjaan di pabrik-pabrik tersebut berada dalam kategori beban kerja sedang dengan pengeluaran energi 200-350 kkal/ jam (46,81%). Hasil uji statistik dari hubungan antara usia, masa kerja, beban kerja, dan area kerja pada pekerjaan postural menunjukkan bahwa beban kerja adalah yang paling terkait dengan postur pekerja. Tindakan untuk memperbaiki postur kerja berdasarkan analisis REBA adalah dengan menyesuaikan posisi alat atau mesin dengan ketinggian tubuh pekerja, memperhatikan waktu kerja, dan waktu istirahat. Yang paling mendesak adalah menggunakan alat saat mengangkat wadah. Abstract[Risk Assessment of Work Posture In Indonesian Crumb Rubber Factories Workers] Musculoskeletal pain complaints often occur in the three largest crumb rubber factories located in Padang, Indonesia. This study aimed to analyze the work posture using the Rapid Entire Body Assessment (REBA) method for workers in the production area. Retrieval of employee posture data utilizing the help of video cameras and observation sheets. Respondents consisted of 135 wet area workers and 213 dry area workers. The REBA assessment showed that 72.34% of the work examined was included in the medium-risk category. The highest REBA score in the wet area was in the natural drying process. In dry areas, the highest REBA score is in the process of lifting containers from trucks. Based on Indonesian Standard No.7269 / 2009, this shows that work in these factories was in the category of moderate workloads with an energy expenditure of 200-350 kcal/hour (46.81%). Statistical test results from the relationship between age, work-period, workload, and work area on postural work indicated that workload was most related to worker posture. Action to improve postural work was to adjust the position of the tool or machine with the height of the worker's body, pay attention to work time, and rest periods.Keywords: Musculoskeletal, Exposure assessment, work posture, REBA, crumb rubber factories
Simultaneous distribution of wired and two 2 × 2 MIMO wireless OFDM signals over an integrated RoF-PON system
Authors: Belkacem Anes , Borsali Ahmed Riad 
Published: July 2021

Abstract
In this paper, the integration of the radio over fiber technology into a passive optical network (RoF-PON) is proposed to simultaneously distribute wired and two wireless standards each one transports 2 × 2 multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) signals. This simultaneous transmission is operated based on a single centralized optical wavelength and enabled by a polarization division multiplexing technique. The proposed RoF-PON system offers high spectral efficiency and is designed for unlicensed industrial, scientific, and medical bands at 2.4 and 5.8 GHz. The system performance is assessed by measuring the bit error rates (BERs) according to different access distances up to 30 km. After determining the optimum extinction ratio (ER) to modulate the baseband wired signal that allows jointly optical modulation of wireless signals using the same optical wavelength; all the 2 × 2 quadrature amplitude modulation (QAM) MIMO-OFDM wireless signals with a wired signal are successfully delivered without using forward error correction limit. Additionally, the system reliability has been confirmed by adopting other modulations schemes such as 8 and 16 phase-shift keying (PSK) that maintained good constellation diagrams performances. Whereas, the wired signal is analyzed according to its BER and quality Q-factor including high-quality eye diagram patterns. Also, the results revealed that the MIMO-OFDM signals mapped by 16 QAM scheme are given a better performance than PSK schemes when they are accompanied with high data rate baseband wired signal via a PON distance of 30 km.
Mechanical behavior of butt curved adhesive joints subjected to bending
Authors: Ayaz Yaşar , Şerif Çitil 
Published: July 2021

Abstract
Factors such as the surface geometry of a joint, the direction of the applied load, and the type of adhesive used have a great influence on the strength of a joint in adhesive bonding. In adhesively bonded joints (ABJ), it is possible to improve surface geometry by forming various geometric surfaces. ABJs are not very resistant to peeling stress, thus requiring that a bonding model be analyzed according to the direction of the applied load to prevent peeling stress. In this study, a butt curved joint was prepared from aluminum plates (A2024-T3) to improve the surface geometry of the joint. The mechanical behavior of the joints in three-dimensions and subjected to bending were investigated depending on an increase in the curvature radius. The adhesive DP810 was used for bonding. The finite element analysis was performed in ANSYS and cohesive zone modeling was used for a simulation of the damage growth in the adhesive layer. The results of bilinear and exponential models were found to be more appropriate to the experimental results. When the radius of curvature increases, the damage load carried decreases in the butt curved lap joints. It was seen that decreases in the curvature radius significantly decrease normal stress.
Effect of Y addition on the structural transformation and thermal stability of Ti-22Al-25Nb alloy produced by mechanical alloying
Authors: Çetin Mehmet Emin , Polat Gökhan , Tekin Mustafa , Batibay Ahmet Burçin , Kotan Hasan 
Published: July 2021

Abstract
In this study, a Ti-22Al-25Nb alloy with nanocrystalline structure was produced by high energy mechanical alloying (HEMA) and 1 at.-% yttrium was added as a thermal stabilizer. The as-milled samples were annealed at various temperatures up to 900 °C in a protective gas atmosphere, and the samples were allowed to cool to room temperature in the furnace. The phase transformations and microstructural changes as a function of the annealing temperatures and alloy compositions were studied using room- and high-temperature X-ray diffraction (XRD), focused ion beam microscopy (FIB), and scanning electron microscopy (SEM). The mechanical properties of the samples were interpreted based on the hardness results and their correlation with the microstructures. The results showed that the as-milled nanocrystalline structure of Ti-22Al-25Nb alloy increased from 3.4 nm to 350 nm after annealing at 800 °C due to the high driving force induced by the large grain boundary area. Consequently, the as-milled hardness of the Ti-22Al-25Nb alloy dropped from 7.63 ± 0.18 GPa to 5.37 ± 0.28 GPa. The grain size stability of the Ti-22Al-25Nb alloy after annealing at elevated temperature was ensured through the addition of yttrium. Thus, the grain size remained at the level of 125 nm, and the hardness value was maintained at around 6.98 ± 0.43 GPa after annealing at 800 °C.
Investigation of in situ synthesized TiB2 particles in iron-based composite coatings processed by hybrid submerged arc welding
Authors: Kaptanoglu Mustafa , Eroglu Mehmet 
Published: July 2021

Abstract
In the study for this contribution, production of in situ synthesized TiB2 particles in iron-based composite coatings using four different submerged arc welding powders (fluxes) containing increasing amounts of ferrotitanium and ferroboron with S1 welding wire, were targeted. For this purpose, coating deposition was carried out to improve the hardness and wear properties of the AISI 1020 steel surfaces using hybrid submerged arc welding. In hybrid submerged arc welding, the welding pool is protected by both welding powders and an argon gas atmosphere. To examine the composite coatings, visual, chemical, microstructural analyses and hardness and wear tests were carried out. With the use of increasing amounts of ferrotitanium and ferroboron in the welding powders, it was observed that the microstructure of the coatings changed in terms of TiB2 particle geometries such as rectangular and hexagonal; volume fractions of TiB2 particles in the coating microstructures increased; hardness values of coatings were enhanced from 34 HRC to 41 HRC; the wear resistance of the coatings improved, and worn surface images of the coatings caused by the counter body changed from continuous with deep scratches to discontinuous with fine scratches and crater cavities.
Efficient generation of optical bottle beams
Authors: Xiao Yuzhe , Yu Zhaoning , Wambold Raymond A. , Mei Hongyan , Hickman Garrett , Goldsmith Randall H. , Saffman Mark , Kats Mikhail A. 
Published: July 2021

Abstract
Optical bottle beams can be used to trap atoms and small low-index particles. We introduce a figure of merit (FoM) for optical bottle beams, specifically in the context of optical traps, and use it to compare optical bottle-beam traps obtained by three different methods. Using this FoM and an optimization algorithm, we identified the optical bottle-beam traps based on a Gaussian beam illuminating a metasurface that are superior in terms of power efficiency than existing approaches. We numerically demonstrate a silicon metasurface for creating an optical bottle-beam trap.
Crystal structure and anti-inflammatory activity of (E)-7-fluoro-2-((5-methoxypyridin-3-yl)methylene)-3,4-dihydronaphthalen-1(2H)-one, C17H14FNO2
Authors: Sun Jia-Jia , Zhang Xiao-Fan , Meng Qing-Guo , Li Hong-Juan , Wang Chun-Hua 
Published: July 2021

Abstract
C17H14FNO2, monoclinic, C2/c (no. 15), a = 15.5754(12) Å, b = 7.4828(6) Å, c = 23.0981(18) Å, β = 90.797(7)°, V = 2691.8(4) Å3, Z = 8, R

gt
(F) = 0.0442, wR

ref
(F
2) = 0.1096, T = 100(1)° K.
Excitation functions of some deuteron-induced nuclear reactions on Al
Authors: Uddin M. Shuza , Basunia M. Shamsuzzoha , Qaim Syed M. 
Published: July 2021

Abstract
Excitation functions of the reactions 27Al(d,αp)24Na, 27Al(d,2p)27Mg and 27Al(d,p)28Al were measured by the activation technique up to deuteron energies of 37 MeV. The available experimental databases of the reaction products 27Mg and 28Al were extended and compared with the nuclear model calculations based on the code TALYS-1.8. Our measured data are reproduced well by the model calculations after adjustment of a few free input parameters. The cross-section ratio of the (d,αp) to (d,2p) process as a function of projectile energy was deduced from the measured data, and the result is interpreted in terms of competition between a proton and an α-particle emission.
Psychometric assessment of the Swedish version of the injustice experience questionnaire among patients with chronic pain
Authors: Ahlqvist Lindqvist Emma , Ljungvall Hanna , Zetterberg Lena , Zetterberg Hedvig , Bring Annika , de Belder Tesséus Charlotte , Åsenlöf Pernilla 
Published: July 2021

Abstract

Objectives
The use of the Injustice Experience Questionnaire (IEQ) in psychological assessment of individuals with chronic pain is supported by research. The psychometric properties of the Swedish version, the IEQ-S, has not yet been evaluated. Hence, the aim was to investigate structural validity, and concurrent criterion validity of the IEQ-S against the Work Ability Index (WAI), the Pain Catastrophizing Scale (PCS-SW), the Patient Health Questionnaire 9-item depression module (PHQ-9), and the Generalized anxiety disorder 7-item scale (GAD-7). Internal consistency and test-retest reliability were also studied.

Methods
Sixty-five participants, referred to a University hospital, with a pain duration over three months were consecutively sampled. They completed the IEQ-S at admission and again within six weeks. A confirmatory factor analysis was performed for the study of structural validity. Concurrent criterion validity was evaluated using Spearman’s correlation coefficient. Internal consistency reliability for the full IEQ-S was calculated using the Cronbach’s alpha. Test-retest reliability was calculated using an Intraclass Correlation Coefficient (ICC).

Results
The median total score (0–48, where high scores indicate high levels of injustice) at admission (test 1) was 27.0 (n=64), 25th percentile=15.3, 75th percentile=37.8, range=3–48 points. A one-factor model was supported with item-loadings between 0.67–0.92. Spearman’s correlation coefficient between the IEQ-S and the WAI (n=56) was r

S
=−0.46; the PCS-SW (n=63) was r

S
=0.68, the PHQ-9 (n=64) was r

S
=0.50 and the GAD-7 (n=64) was r

S
=0.57, p<0.01. Cronbach’s alpha was 0.94 (n=64). The ICC was 0.80 (n=55), with a 95% confidence interval, ranging between 0.69–0.88.

Conclusions
Our study supported structural validity and concurrent criterion validity of the IEQ-S against other measures of psychological constructs and work ability. It also supported the internal consistency reliability of the IEQ-S and the test-retest reliability with a retest interval up to six weeks, was good. These findings support the use of the IEQ-S as an adjunct tool to assess appraisals of injustice in patients with chronic pain who are referred to tertiary care in Sweden. The added value might be identification of those who are at risk for slow or no improvement in their pain condition over time, and sick-leave, but this has to be confirmed in future studies.

Ethical committee number
EPN Uppsala D-No 2016-376.