bluuebunny/crossref_metadata_2025_split huggingface dataset:
Covid-19 and Unemployment: Evidence from Puerto Rico Using Bayesian Analyses with High-Frequency Data
Authors: Toledo Wilfredo 
Published: October 2021

Abstract
The paper aims at determining the relationship between the Covid-19 contagion level and the state of the economy using high-frequency data from Puerto Rico. In order to achieve the aim set, the direction of the causality relationship between the numbers of infected persons and the unemployment rate was determined. Furthermore, various Bayesian statistical models were estimated. The analysis results imply that the unemployment rate responds moderately to the Covid-19 contagion level itself and not the other way around. The 95 % credible interval for the elasticity coefficient of the unemployment rate relative to the virus is estimated as [0.0140–0.1448]. Evidence also shows that at the beginning of 2021, most of the fluctuations in the unemployment rate were explained directly by the Covid-19 perturbations. Hence, no evidence was found that economic activity promoted the virus spread in the analysed economy.
Verification of the Job Performance Model based on Employees’ Dynamic Capabilities in organisations under the COVID-19 pandemic crisis
Authors: Bieńkowska Agnieszka , Koszela Anna , Tworek Katarzyna 
Published: October 2021

Abstract
The paper aims to verify the Job Performance Model based on Employees’ Dynamic Capabilities (EDC) and explain the mechanisms shaping job performance based on EDC in an initial phase of the crisis in an organisation due to the Black Swan phenomena, on the example of the COVID-19 pandemic of 2020. Empirical research on Italian organisations affected by the crisis shows that the Model is significantly distorted under such conditions. To verify the internal structure of the Job Performance Model based on EDC under critical conditions, the statistical correlation analysis, linear regression analysis and path analysis were executed using SPSS and SPSS AMOS. The research result of the statistical analysis confirmed that the new version of the Model for organisations under the Black Swan phenomenon was statistically significant without work motivation and job satisfaction. It was also proven that P–J fit still linked EDC and job performance through strengthening work engagement. The research confirmed that the Job Performance Model based on EDC, which has so far been verified under normal working conditions, radically changed its structure during the COVID-19 crisis. This means that factors previously considered important in the Job Performance Model based on EDC have become insignificant in shaping job performance. Therefore, this is an inspiration for further research to verify the Job Performance Model based on EDC in different phases of the crisis.
Resilient manufacturing: case studies in Thai automotive industries during the COVID-19 pandemic
Authors: Kaeo-Tad Najavadh , Jeenanunta Chawalit , Chumnumporn Kwanchanok , Nitisahakul Thanapatra , Sanprasert Vararat 
Published: October 2021

Abstract
The coronavirus pandemic is a crisis that disrupts the global supply chain and slows down the world economy. A significant challenge for the companies in the manufacturing sector is to mitigate risks related to the COVID-19 outbreak. Grounded in the resilience theory, resilience (i.e., prepare, prevent, protect, respond, and recover processes) aims to manage risks and ensure business continuity. This research aims to identify the key factors for the resilient manufacturing management of Thai automotive industries during the COVID-19 outbreak. Three outstanding companies of tier 1 automotive suppliers have been selected as case studies in this work. This qualitative research was completed by using a semi-structured interview. The target interviewers were CEOs or general managers. The data analysis was divided into two phases. Phase one summarised the interview data of each company. Phase two used thematic analysis and cross-case analysis to identify resilience practices’ patterns, themes, and multi-factors. The findings indicate three key factors to enhance resilience: leadership, technology, and the firm’s experience in handling emerging events. Together, these factors help enterprises to prepare for Business Continuity Planning (BCP), improve supply chain management, and increase the firm’s ability to recover from disruption situations. This paper contributes to the literature on the supply chain resilience in the automotive industry by providing a guideline for firms to implement resilience practices, improve business operations, and increase firm’s capabilities, both as human skills and technologies, to deal with a novel crisis. Resilience practices response to the COVID-19 outbreak not only helps the companies minimise business disruption in the short-term but also includes the long-term response strategies for unknown events. For this purpose, the case study research was conducted to investigate the resilience strategies during the COVID-19 pandemic and determine the critical success factors of resilience implementation in the Thai automotive industry.
Partial replacement of cement with rice husk ash in concrete production: an exploratory cost-benefit analysis for low-income communities
Authors: Muleya Franco , Muwila Natasha , Tembo Chipozya Kosta , Lungu Alice 
Published: October 2021

Abstract
Cement is an important construction material in concrete production; however, it is expensive and unaffordable for many low-income and rural communities in developing countries. Rice husk is a by-product from the rice mill process, with an approximate ratio of 200 kg rice husk per one tonne of rice produced. This experimental study aimed to investigate the integrity of concrete produced in Zambia using rice husk ash (RHA) to partially replace cement. The primary goal was to carry out a cost–benefit analysis on the use of RHA in concrete. RHA was used to partially replace cement with ratios of 10 %, 20 % and 30 %. The 20 % cement replacement mix produced the optimum 18 MPa concrete strength results at a 0.5 water/binder ratio. This translated in cost reduction of concrete by 12.5 %, which is particularly significant for higher concrete volumes. The produced concrete is suitable for lightly loaded structures, such as foundation footings, surface beds and walkways to benefit low-income communities. The study further concluded that the RHA based concrete was more cost-efficient in structures that were close to areas of rice production due to reduced RHA transportation costs.
Liability of an Air Carrier for Personal Damage
Authors: Mendala Oliwier , Kozuba Jarosław 
Published: October 2021

Abstract
The aim of the study is to present the principles of civil liability for damage caused to a passenger for which an air carrier is responsible, regulated by the Warsaw and Montreal Conventions, and the norms of national law providing issues that are not included in international law acts. The paper presents a historical overview of the applicable Conventions. The provisions of the Polish Civil Code that are useful for interpretation of law institutions and complement the legal norms contained in the Conventions are also presented. The compiled issues put the legal norms contained in various law systems in order by indicating the practical dimension of the pursuit of potential claims by passengers vis-à-vis air carriers. This is followed by a discussion of the grounds for excluding third party liability of an air carrier in case of excessive or illegitimate claims of the carrier’s clients, and of the insurer.
Legal Aspects Regarding Liability for Shooting Down an Aircraft
Authors: Fortońska Agnieszka 
Published: October 2021

Abstract
The author will raise the issue of responsibility for shooting down a civil aircraft. The powers of the state, as well as the responsibilities and obligations that are imposed on the state in this matter will be presented. The paper will also define the notion of sovereignty. Then, international documents which govern the responsibility of the state will be discussed. The author will also indicate the origin of the introduction of regulations on the shooting down of aircraft. The author will also provide examples of such incidents involving civil aircraft. In addition, the paper will include the position of the Constitutional Tribunal regarding the matter of shooting down an aircraft. The work will conclude with considerations regarding the legitimacy and reasons for shooting down aircraft. Can we sacrifice one “good” in the name of another?
The System Dynamic and Compram Methodologies for Modelling, Simulation and Forecasting of Road Safety of Uzbekistan
Authors: Abdunazarov Jamshid , Mikusova Miroslava , Kyamakya Kyandoghere 
Published: October 2021

Abstract
In Uzbekistan, about 2,000 people die every year as a result of a traffic accident. At the same time, according to the Pulitzer Centre on Crisis Reporting, the Republic has the lowest rate in road mortality among the countries in the Central Asian region - for every 100,000 people, it is 11.32 people. Losses from road accidents in Uzbekistan equivalent up to 2.8% of GDP that is also one of the lowest indicators. But according to traffic safety experts, the losses from accidents are greater than reported data. Nowadays there are a lot of methods to analyse and ensure road safety and traffic management on the roads. The authors believe that road safety is a complex societal problem not only in Uzbekistan but all over the world. One of these methods is System Dynamic (SD) and COMplex PRoblem hAndling Methodology (COMPRAM). In this work, the Vensim PLE SD software tool (it is one SD tool amongst many others) has been used to perform the SD modelling of the case study at hand. In the methods of system dynamics, a computer model is created using a graphical technique for constructing flow diagrams and causal relationships of the system under study and then simulated on a computer. COMPRAM allows us to figure out the way to handle complex societal problems while involving a System Dynamics (SD) simulation option. There are similarities between COMPRAM and the traditional way of analysing road safety. In traditional ways, each element or factor is studied as a separate phenomenon. These indicators are studied in the stages of COMPRAM. This article has been studied a different aspect of how road accidents happen. The developed a comparison (according to six criteria) of the different modelling paradigms which have been historically used to assess road safety. Also, the authors made a comparison of the COMPRAM methodology with the traditional road safety assessment approach to highlight similarities and differences.
The Operational Technique of Increasing Service Life Time of the Major Components of the Fighter Aircraft Engine Rotors
Authors: Pashchenko Serhii , Shulhin Artem , Samuleev Volodimyr , Lobunko Оleksandr , Dobridenko Оleg 
Published: October 2021

Abstract
The operational technique for the major components of the fighter aircraft engine rotors has been introduced basing on the real conditions of their cyclic loading in each flight or ground test and a priori information on their previous operation. It has been confirmed that the obtained technical solutions not only conform to the current methods of accounting for the depletion of the life cycle of the Afterburning Turbofan Engine (ATE) but also introduce additional opportunities to consider individual characteristics and conditions of their cyclic loading throughout the overall operating time. A method for estimating the depletion of the life cycle in accordance with the Total Accumulated Cycle (TAC) has been proposed. It allows us to compare the actual operating time of the ATE in hours and the accumulated value of cyclic damage to the engine and its major components (within the TAC parameter) during the previous operation.
The Risk Related to the Influence of Sleep Deprivation on the Reliability of Human on the Example of Pilot
Authors: Berlik Marcin , Ewertowski Tomasz 
Published: October 2021

Abstract
The purpose of this publication is to discuss the issues related to the operator sleep deficiency, its effects and the resulting risk. The issue is discussed on the example of a pilot, as a position in which the probability of occurrence of the phenomenon is high, with consequences of its occurrence that can be very severe. Despite the fact, the authors try to present the issues in a universal way enabling reference to a wide spectrum of different types of operators. In the article, concepts such as risk and fatigue are characterized. Furthermore, short and long-term fatigue are discussed, as well as the impact of shift work on human health and reliability. The second part presents methods of fatigue monitoring useful in aviation. The summary emphasizes the need for a holistic approach to the issue of crew fatigue in the management and the need for actions before commencing with work.
AUDIT KESELAMATAN JALAN UNTUK JALAN TOL YANG OPERASIONAL DI BAWAH 1 TAHUN
Authors: Setyarini Ni Luh Shinta Putu Eka , Prihatiningsih Aniek , Sianturi Liana Fentani Natalia , Gea Stephen Deprianto 
Published: October 2021

The imbalance population and number of vehicles increasing from year to year with number of roads causing traffic jam. Build toll road is the government's effort to solve traffic jam. The construction of toll roads that carried out by Government is expected to be able reduce traffic jam on arterial roads but in reality, does not reduce traffic jam even though traffic jam still exist on toll roads. Traffic jam causes stress and fatigue and can lead to traffic accidents. Indonesia has a much higher mortality rate compared to other countries. Traffic accidents are influenced by three main factors: human factors, vehicle factors, and road factors. To improve road safety and high number of deaths each year, it will be carried out research by direct observation using the Road Safety Audit (RSA) form of the Kunciran-Serpong Toll Road. The result of this research by direct observation on Kunciran-Serpong Toll Road in general there are still many shortcomings, such as various types of road damage and pavement, there are no signs to bend to the left or right, the drainage system is not good on several roads, and the median is not good because not all segments get fenced. Keywords: Traffic Jam; Accident, Toll; Road Safety AuditAbstrakSeiring dengan pertambahan jumlah penduduk maka jumlah kendaraanpun terus berkembang dari tahun ke tahun, sedangkan panjang ruas jalan tidak dapat menyusul secara signifikan, hal ini mengakibatkan terjadinya kemacetan lalu lintas. Upaya pemerintah mengurangi kemacetan dengan membangun jalan Tol yang diharapkan untuk mampu mengurangi kemacetan yang ada di jalan arteri. namun pada kenyataannya tidak mengurangi kemacetan bahkan jalan tol saat ini juga mengalami kemacetan. Beberapa jalan tol dibangun untuk mengurangi kemacetan yang ada di ruas jalan tol yang lama, karena apabila tidak dikurangi maka kemacetan menyebabkan stres dan lelah fisik, mengurangi produktifitas yang akhirnya mengakibatkan kecelakaan lalu lintas. Indonesia memiliki tingkat kematian yang jauh lebih tinggi dibandingkan dengan negara lainnya di ASEAN. Kecelakaan lalu lintas dipengaruhi tiga faktor utama yaitu faktor manusia, faktor kendaraan, dan faktor jalan. Dalam rangka upaya meningkatkan keselamatan jalan dan mengurangi angka kematian setiap tahunnya maka dilaksanakan observasi langung dengan mengunakan formulir Audit Keselamatan Jalan (AKJ) atau Road Safety Audit (RSA) pada ruas jalan tol operasional. Hasil dari observasi langung pada ruas jalan tol operasional di bawah 1 tahun secara umum masih terdapat banyak kekurangannya, seperti berbagai jenis kerusakan jalan terutama pada perkerasan, tidak adanya rambu peringatan tikungan ke kiri maupun ke kanan dan beberapa rambu lainnya, kecepatan eksisting yang lebih besar dari kecepatan rencana, dan median yang kurang baik karena tidak semua ruas terdapat pembatas
PENENTUAN NILAI DEFLEKSI MAKSIMUM PADA JEMBATAN STEEL BOX GIRDER BERDASARKAN DATA NILAI ROTASI
Authors: Surachmat David , Suangga Made 
Published: October 2021

Structural health monitoring system plays a crucial role in order to ensure a well-maintained bridge condition. There are a number of methods that may be utilized in order to conduct the monitoring process, namely the use of Global Positioning System (GPS). Despite its accuracy, the use of GPS is deemed costly. A more practical and economical approach to predicting deflection is the use of tiltmeter to obtain rotational values. This research studied the accuracy of simple span steel box girder deflection that is obtained from regression formulae. The analysis showed that a 3D linear and quadratic regression with two rotation data provided the best accuracy if compared with 2D. Keywords: deflection; rotation; structural health monitoring system; tiltmeter AbstrakPemantauan kesehatan struktur jembatan (structural health monitoring system) sangat penting dilakukan untuk memastikan jembatan tetap dalam kondisi yang memadai. Banyak cara yang dapat dilakukan untuk memonitor kondisi jembatan, salah satunya dengan menggunakan Global Positioning System (GPS). Walaupun menghasilkan data yang akurat, penggunaan GPS dipandang menghabiskan biaya yang relatif besar. Adapun solusi yang lebih praktis dan murah untuk memprediksi defleksi yaitu dengan menggunakan tiltmeter dengan data rotasi. Pada studi ini, telah dipelajari tingkat akurasi defleksi jembatan steel box girder dengan bentang sederhana dari hasil persamaan regresi dengan data rotasi. Hasil analisis menunjukkan bahwa model regresi linear dan kuadratik 3D untuk 2 data rotasi memiliki tingkat akurasi lebih baik jika dibandingkan dengan model regresi linear dan kuadratik 2D untuk 2 data rotasi.
STUDI PERBANDINGAN ANALISA KETELITIAN TINGGI MENGGUNAKAN TOTAL STATION DAN SIPAT DATAR
Authors: Mulyani Agnes Sri , Tampubolon Sudarno 
Published: October 2021

This research was conducted to analyze and determine the height difference accuracy using the method of measuring the different heights of a closed loop using Waterpass B2 and Total Station Kolida 420SR. The location of research in the Ciloto area, Puncak, West Java with coordinates 107˚ east longitude and 06˚ south latitude, on 14-15 December 2014 using a local high point reference. Measurements were made three times with different looped but the starting and ending points were the same points. Accuracy of calculation is done by calculating the average of the least squares to determine the standard deviation of the measurement results with each equipment. The result is the standard deviation of the height difference with the waterpass is 0.01mm, while with the Total Station it is 0.02 mm. Based on the results of the standard deviation of the height difference, the Total Station can be used for height measurements in civil engineering project that does not require very high accuracy and height difference measurements with the Total Station are more economical because the time required for measurement is a quarter of the time required height difference measurement with Waterpass. Keywords: height measurement; Waterpass; Total station. AbstrakPenelitian ini dilakukan untuk menganalisis dan mengetahui ketelitian beda tinggi menggunakan metode pengukuran beda tinggi suatu ring tertutup menggunakan Waterpass B2 dan Total Station Kolida 420SR. Lokasi penelitian terletak di daerah Ciloto, Puncak Jawa Barat dengan koordinat 107o bujur timur dan 06o lintang selatan, pada tanggal 14 dan 15 Desember 2014 dengan menggunakan referensi titik tinggi lokal. Pengukuran dilakukan tiga kali dengan ring yang berbeda namun titik pangkal dan ujung adalah titik yang sama. Hitungan ketelitian dilakukan dengan hitung perataan kuadrat terkecil untuk mengetahui standar deviasi hasil pengukuran dengan masing-masing alat. Hasilnya adalah standar deviasi beda tinggi dengan waterpass sebesar 0.01mm, sedangkan dengan Total Station sebesar 0.02 mm. Berdasarkan hasil perhitungan nilai standar deviasi pengukuran beda tinggi, maka Total Station dapat digunakan untuk pengukuran beda tinggi pada pekerjaan teknik sipil yang tidak memerlukan ketelitian yang sangat tinggi, dan pengukuran beda tinggi dengan Total Station lebih ekonomis karena waktu yang diperlukan untuk pengukuran adalah seperempat dari waktu yang diperlukan pengukuran beda tinggi dengan Waterpass.
Synthesis of Some New Bis- 2, 3-Dihydroquinazolin-4(1H)-one Derivatives from Dapsone Drug and Investigating their Liquid Crystalline Properties and Antibacterial Activities
Authors: Jumaa Fawzi Hameed , Shawkat Safa Mahmood 
Published: October 2021

During this paper, new Schiff's base derivatives [F1-F5] were prepared through the reaction of dapsone drug with different substituted benzaldehyde compounds. Schiff's bases were then converted into 2,3-dihyroquinazolin-4(1H)-one derivatives [F6-F10] through the reaction with 2-amino benzoic acid in ethanol. The synthesized compounds were identified by their physical properties using UV-Vis, FT-IR and 1H-NMR analyses. The liquid crystalline properties of some prepared compounds revealed smectic and nematic phases. Using two separate bacterial species, Pseudomonas aeruginosa (Gram -ve) and Staphylococcus aureus (Gram +ve), the antimicrobial activities of certain synthesized compounds [F1,F2,F7,F8] were investigated using the agar diffusion process. The findings revealed that some of the assayed compounds had antimicrobial activities against the bacteria tested.
Protein hidrolisat daging bekicot (Achatina fulica) sebagai pengurang penggunaan tepung ikan terhadap performa ayam kampung super
Authors: Suryadi Ujang , Imam Shokhirul , Ahmad Aufa Fariza 
Published: October 2021

The aim of the study was to determine the level of use of fermented snail meat protein hydrolyzate (FSMPH) as a reduction of fish meal (FM) in the ration, and its effect on the production performance of “super” native chicken (SNC). Research materials were SNC unsexing and FSMPH. The study used an experimental method with a completely randomized design with 5 treatments and 4 replications. The research ration treatments were: P0 = FM 8% without FSMPH (Control), P1= TI 6%+FSMPH 5 ml/kg ration, P2= TI 4%+FSMPH 10 ml/kg ration, P3= TI 2%+FSMPH 15 ml/kg ration, P4= TI 0%+FSMPH 20 ml/kg ration. The results showed that the a reduction of FM with FSMPH on SNC ration consumption at each level had no significant effect (P>0.05) on control feed, BW, BWG, and FCR in P1, P2, and P3 treatments on control feed, but showed a significant difference (P<0.05) in lower BW, BWG, and higher FCR in P4 treatment of SNC fed with 8% (control). The conclusion was that FSMPH can be used as a reduction for FM up to 75% of the use of FM in the ration as much as 8%.