bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of ZnO nanoflakes and assessment of their removal of HCN, NO2 and SO2 toxic gases
Authors: Hanh Nguyen Thi , Pham Xuan Manh , Nguyen Thanh Nhan , Thi Nhung Hac , DangThi Tuyet Anh , Tran Quang Vinh , Vu Anh Tuan , Hoang Mai Ha , Nguyen Tuyen Van 
Published: February 2021

Abstract
Zinc oxide nanoflakes were synthesized using the wet precipitation method from aqueous solutions of zinc nitrate and sodium hydroxide. The obtained materials were characterized by means of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption methods. The presence of sodium lauryl sulfate in the preparation of zinc oxide resulted in thinner, larger size, and higher specific surface area nanoflakes. The saturated adsorption capacities of zinc oxide nanoflakes for HCN, NO2, and SO2 were 216 mg g–1, 81 mg g–1, and 38 mg g–1, respectively. These results suggest that the material is a potential candidate for the removal of these toxic gases.
Fiber optic propagation problems and signal bandwidth measurements under high temperature and high dopant germanium ratios
Authors: Eid Mahmoud M. A. , Rashed Ahmed Nabih Zaki 
Published: February 2021

Abstract
This study presents fiber optic losses/dispersion and signals bandwidth measurements under high temperature and high dopant germanium ratios variations for ultra-long haul distances without amplification stage. The fiber losses, fiber dispersion, and total fiber data rates are estimated and compared with the previous results under room temperature and high germanium dopant ratios to silica glass fiber. Then the model is extended for ultra-fiber transmission distances up to 500 km under high-temperature variations without using any amplification stage. The fiber losses/dispersion coefficient is degraded, and the total fiber data rates are enhanced with the increment of high dopant ratios of germanium.
Gain/noise figure spectra of average power model Raman optical amplifiers in coarse wavelength multiplexed systems
Authors: Eid Mahmoud M. A. , Said Said Mohammed , Rashed Ahmed Nabih Zaki 
Published: February 2021

Abstract
This work clarifies the gain/noise figure spectra of average power model Raman optical amplifiers in coarse wavelength multiplexed systems. The proposed model have a total received power of 16.306 dBm, signal gain of 21.68 dB, and noise figure of 3.802 dB at the same operation parameters of the previous model which operated at length 0.2 km at the optical fiber coarse wavelength division multiplexing (CWDM) and transmitted signal power is 20 dBm. So the updates help us to greatly improve the system.
Research reactor model for isotope production based on the design of VVER-440 reactors
Authors: Terekhova A. , Mahdi A. , Zykova R. 
Published: February 2021

Abstract
The following work is an attempt to develop a model research reactor based on VVER-440 technologies, primarily for the production of radioisotopes used in nuclear medicine procedures. The article describes the basic design features of the model 10 MW multipurpose VVR reactor, including the features of reactor fuel, core, and related structures. A comparative analysis of targets for maximizing 99Mo production is also presented.
A decision-making method based on Bayesian optimization algorithm for small modular reactor
Authors: Zhang B. , Peng M. , Cheng S. , Sun L. 
Published: February 2021

Abstract
Small modular reactors (SMRs) are suitable for deployment in isolated underdeveloped areas to support highly localized microgrids. In order to achieve almost autonomous operation for reducing the cost of operating personnel, an autonomous control system with decision-making capability is needed. In this paper, a decision-making method based on Bayesian optimization algorithm (BOA) is proposed to explore the optimal operation scheme under fault conditions. BOA is used to adjust exploration strategy of operation scheme according to observations (operation schemes previously explored). To measure the feasibility of each operation scheme, an objective function that considers security and economy is established. BOA attempts to obtain the optimal operation scheme with maximum of the objective function in as few iterations as possible. To verify the proposed method, all main pump powered off fault is simulated by RELAP5 code. The optimal operation scheme of the fault is applied, the transient result shows that all key parameters are within safe limits and SMR is maintained at relatively high power, which means that BOA has the decision-making capability to get an optimal operation scheme on fault conditions.
Sensitivity analysis of stochastic frontier analysis models
Authors: Sakouvogui Kekoura , Shaik Saleem , Doetkott Curt , Magel Rhonda 
Published: February 2021

Abstract
The efficiency measures of the Stochastic Frontier Analysis (SFA) models are dependent on distributional assumptions of the one-sided error or inefficiency term. Given the intent of earlier researchers in the evaluation of a single inefficiency distribution using Monte Carlo (MC) simulation, much attention has not been paid to the comparative analysis of SFA models.
Our paper aims to evaluate the effects of the assumption of the inefficiency distribution and thus compares different SFA model assumptions by conducting a MC simulation. In this paper, we derive the population statistical parameters of truncated normal, half-normal, and exponential inefficiency distributions of SFA models with the objective of having comparable sample mean and sample standard deviation during MC simulation. Thus, MC simulation is conducted to evaluate the statistical properties and robustness of the inefficiency distributions of SFA models and across three different misspecification scenarios, sample sizes, production functions, and input distributions. MC simulation results show that the misspecified truncated normal SFA model provides the smallest mean absolute deviation and mean square error when the true data generating process is a half-normal inefficiency distribution.
Impact of body mass index on left atrial dimension in HOCM patients
Authors: Zhou Yue , Yu Miao , Cui Jingang , Liu Shengwen , Yuan Jiansong , Qiao Shubin 
Published: February 2021

Abstract

Background
Substantial studies have demonstrated that left atrial (LA) enlargement was a robust predictor of atrial fibrillation (AF) and obesity was a modifiable risk factor for cardiovascular diseases. However, the role of body mass index (BMI) on LA dimension in hypertrophic obstructive cardiomyopathy (HOCM) remains unclear.

Methods
A total of 423 HOCM patients (average BMI 25.4 ± 3.4 kg/m2) were recruited for our study. Participants were stratified into three groups based on BMI: normal weight (BMI < 23 kg/m2), overweight (BMI 23–27.5 kg/m2), and obesity (BMI ≥ 27.5 kg/m2).

Results
Compared with normal weight, patients with obesity had significantly lower prevalence of syncope (p = 0.007) and moderate or severe mitral regurgitation (p = 0.014), and serum NT-proBNP (p = 0.004). Multiple linear regression analysis indicated that BMI (β = 0.328, p < 0.001), log NT-proBNP (β = 0.308, p < 0.001), presence of AF (β = 0.209, p = 0.001), and left ventricular diastolic diameter index (β = 0.142, p = 0.019) were independently related with LA diameter. However, BMI was not an independent predictor of the presence of AF on multivariable binary logistical regression analysis.

Conclusions
BMI was independently associated with LA diameter; however, it was not an independent predictor of prevalence of AF. These results suggest that BMI may promote incidence of AF through LA enlargement in HOCM.
An artificial immune system with bootstrap sampling for the diagnosis of recurrent endometrial cancers
Authors: Chang Chih-Yen , Lu Yen-Chiao (Angel) , Ting Wen-Chien , Shen Tsu-Wang (David) , Peng Wen-Chen 
Published: February 2021

Abstract
Endometrial cancer is one of the most common gynecological malignancies in developed countries. The prevention of the recurrence of endometrial cancer has always been a clinical challenge. Endometrial cancer is asymptomatic in the early stage, and there remains a lack of time-series correlation patterns of clinical pathway transfer, recurrence, and treatment. In this study, the artificial immune system (AIS) combined with bootstrap sampling was compared with other machine learning techniques, which included both supervised and unsupervised learning categories. The back propagation neural network, support vector machine (SVM) with a radial basis function kernel, fuzzy c-means, and ant k-means were compared with the proposed method to verify the sensitivity and specificity of the datasets, and the important factors of recurrent endometrial cancer were predicted. In the unsupervised learning algorithms, the AIS algorithm had the highest accuracy (83.35%), sensitivity (77.35%), and specificity (92.31%); in supervised learning algorithms, the SVM algorithm had the highest accuracy (97.51%), sensitivity (95.02%), and specificity (99.29%). The results of our study showed that histology and chemotherapy are important factors affecting the prediction of recurrence. Finally, behavior code and radiotherapy for recurrent endometrial cancer are important factors for future adjuvant treatment.
Generalized Minkowski type inequality for pseudo-integral
Authors: Štrboja Mirjana , Mihailović Biljana 
Published: February 2021

Abstract
In this paper some properties of the pseudo-integral are summarized and a characterization theorem for this integral is proposed. Using the characterization theorem, we obtain that the pseudo-integral with respect to the pseudo-product of two σ-⊕-measures can be reduced to repeated pseudo-integrals. As a consequence of that claim and the Hölder type inequality for the pseudo-integral, we get the generalized Minkowski inequality for the pseudo-integral.
Effect of laser welding speed on pore formation in AA 6061 T6 alloy
Authors: Gündoğdu İş Emine , Akman Erhan , Yilmaz Muharrem , Topuz Polat 
Published: February 2021

Abstract
In this study, 6 mm thick plates of Al 6061 T6 alloy are joined by laser welding at four welding speeds (40 mm × s-1, 35 mm × s-1, 25 mm × s-1, and 20 mm × s-1). The welded joints are made using a 4000 W fiber laser welding machine. The effect of laser welding speed on the pores formed in the weld seam was investigated. In this manner, it was found that with a change in laser welding speed the amount of pores formed in the structure also changed. In addition, after the welding process, macroscopic examinations, tensile tests and the hardness tests were made. As a result of the experiments performed, it was determined that, the laser welding speed was highly effective for pore formation.
Oblique impact behavior of Al-LDPE-Al sandwich plates
Authors: Refah Ahmet , Helin Kaya Şeyma , Nuri Karaoğlu Furkan , Sağlam İsmail , Choupani Naghdali 
Published: February 2021

Abstract
Metal-polymer-metal hybrid sandwich panels are gaining importance in various industrial applications due to their light weight and damping properties. When compared with composite materials, hybrid materials consisting of separate metal and thermoplastic parts can be recycled more easily. In addition to their applications in civil engineering, the aluminum-low density polyethylene-aluminum (Al-LDPE-Al) sandwich panels yield a potential use as light ballistic protection material. In this study, a standard hybrid panel of 3.2 mm polyethylene filling and 0.4 mm of two aluminum metal sheets was experimentally tested under ballistic impact. A finite element model was constructed via commercial software and validated through shooting experiments with a rifle under real conditions. The finite element model was used to simulate the oblique impact behavior of Al-LDPE-Al sandwich panels as a single layer, as 5 layers stacking and as a single layer equivalent of the stacked 5 layer. Results showed that the oblique impact does not have a significant effect on the single layer panel. Stacked layers, however, and the equivalent single layer of a stacked layer have the highest energy absorption under a 30° hitting angle.
New submerged arc welding flux for hardfacing of Hardox steels
Authors: Kaptanoglu Mustafa , Odabasi Akin 
Published: February 2021

Abstract
In this study, the usability of a new submerged arc welding flux was investigated to develop the surface properties of Hardox steels. In the hardfacing welding processes for Hardox 400 steel, four welding speeds resulting in varied heat inputs were applied. Through an analysis of the chemical composition, microstructure examinations, hardness measurements and wear tests, the possibility of hardfacing properties control due to the change of process parameters were determined. In the experimental studies, the hardness of the hardfacing obtained at a welding speed of 30 cm × min-1 was measured as 42 HRC while the hardness of the hardfacing obtained at a welding speed of 48 cm × min-1 was measured as 57 HRC. Moreover, in the wear tests, results consistent with the hardness values were obtained. It was understood in the light of the results that the use of high carbon ferro-chromium 20 wt.-% in a submerged arc welding flux mixture may be useful in improving hardness and wear properties of Hardox steels through hardfacing welding processes.
GIS-based mapping of noise from mechanized minerals ore processing industry
Authors: Susanto Arif , Setyawan Dony O. , Setiabudi Firman , Savira Yenni M. , Listiarini Aprilia , Putro Edi K. , Muhamad Aditya F. , Wilmot John C. , Zulfakar Donny , Kara Prayoga , Shofwati Iting , Sodikin Sodikin , Tejamaya Mila 
Published: February 2021

Abstract
Monitoring workers’ exposure to occupational noise is essential, especially in industrial areas, to protect their health. Therefore, it is necessary to collect information on noise emitted by machines in industries. This research aims to map the noise from mechanized mineral ore industry using the kriging interpolation method, and ArcGIS 10.5.1 to spatially process and analyze data. The experimental calculation result of the semivariogram showed a 0.83 range value, with an essential parameter of 1.75 sill and a spherical total theoretical model. The result shows that the main machines with the highest power consumption and the Leq value are located in the southwest position of the sampled areas with a noise map-projected to assess the workers’ noise exposure level. In conclusion, the study found that the highest noise level was generated ranged from 88 to 97 dBA and contributed to the whole sound pressure level at certain positions.
Lump, lump-one stripe, multiwave and breather solutions for the Hunter–Saxton equation
Authors: Seadawy Aly R. , Rizvi Syed Tahir Raza , Ahmad Sarfraz , Younis Muhammad , Baleanu Dumitru 
Published: February 2021

Abstract
The aim of this article was to address the lump, lump-one stripe, multiwave and breather solutions for the Hunter–Saxton equation with the aid of Hirota bilinear technique. This model concerns in a massive nematic liquid crystal director field. By choosing the function f in Hirota bilinear form, as the general quadratic function, trigonometric function and exponential function along with appropriate set of parameters, we find the lump, lump-one stripe, multiwave and breather solutions successfully. We also interpreted some three-dimensional and contour profiles to anticipate the wave dynamics. These newly obtained solutions have some arbitrary constants and so can be applicable to explain diversity in qualitative features of wave phenomena.
Comparative study of conventional and microwave heating of polyacrylonitrile-based fibres
Authors: Zhao Guozhen , Liu Jianhua , Xu Lei , Guo Shenghui 
Published: February 2021

Abstract
The effects of the conventional heating method and the microwave heating method on polyacrylonitrile-based fibres in the temperature range of 180–280 °C were investigated. Fourier transform infrared spectroscopy, X-ray wide-angle scattering, Raman spectroscopy, energy-dispersive spectrometer, scanning electron microscopy and bulk density were used to characterise the properties of the samples. Results show that the microwave heating method can shorten the pre-oxidation time, reduce pre-oxidation temperature and reduce the number of surface defects. The pre-oxidised fibres obtained by the microwave heating method exhibit not only good crystallite size but also a smooth surface. Atomic morphology and molecular arrangement are orderly inside the fibre. The FT-IR spectrum shows that the oxidation reaction occurs at 220 °C, and the CI value of PAN fibers stabilised by microwave heating is the larger than the fibers stabilised by conventional heating. XRD analysis shows that fibers stabilised by microwave heating have low stack domains. The SEM and Raman spectra indicate that hydrogen peroxide can improve the surface finish of the fibers and reduce defects. Microwave heating can reduce the pre-oxidation temperature by about 20 °C and shorten the heating time. The economic benefits of using this method are significantly improved.
Priorities, actions and risks in the COVID-19 pandemic: a flash SoMe survey among surgical oncologists
Authors: Cortés-Guiral Delia , Sgarbura Olivia , Alyami Mohammad , Yoshida Kazuhiro , Doki Yuichiro , Ishigami Hironori , Grass Fabian , Hübner Martin 
Published: February 2021

Abstract

Objectives
Corona virus-induced disease 19 (COVID-19) pandemic has globally affected the surgical treatment of cancer patients and has challenged the ethical principles of surgical oncologists around the world. Not only treatment but also diagnosis and follow-up have been disrupted.

Methods
An online survey was sent through Twitter and by the surgical societies worldwide. The survey consisted of 29 closed-ended questions and was conducted over a period of 24 days beginning in March 26, 2020.

Results
Overall, 394 surgical oncologists from 41 different countries answered the questionnaire. The predominant guiding principle was “saving lives” 240 (62%), and the different aspects of lock-down found hence large support (mean 7.1–9.3 out of 10). Shut-down of elective surgery and modification of cancer care found a mean support of 7.0 ± 3.0 and 5.8 ± 3.1, respectively. Modification of cancer care longer than two weeks was considered unacceptable to 114 (29%) responders. Hundred and fifty six (40%) and 138 (36%) expect “return to normal” beyond six months for surgical practice and cancer care, respectively.

Conclusions
Surgical oncologists show strong and long-lasting support for lock-down measures aiming to save lives. The impact of the pandemic on surgical oncology is perceived controversially, but the majority was forced already now to accept what is inacceptable for many of their colleagues.
Revisiting cross sections for proton induced reactions on natural lead between 10 and 80 MeV
Authors: Gülez Salim , Pandey Bhawna , Strub Erik 
Published: February 2021

Abstract
This work is focused on the natPb(p,xn)207Bi reaction to extend earlier works on proton induced reactions for the determination of cross sections of residual nuclides. 207Bi decay (half-life 31.55 years) was measured by γ-ray spectrometry in 42 lead foils which had been irradiated by high proton fluxes 20 years ago. Since then, all short-lived radionuclides produced during the irradiation have decayed, so the background is strongly reduced and the cross section could be measured more precisely than during the original measurements. The results are found to be in very good agreement with the historical record. Additionally, theoretical calculations with modern Monte Carlo based codes were performed to compare the calculations of various Bi, Tl and Pb reactions with the historical data and with additional data from literature. The deviations of the new data from both theoretical calculations using EMPIRE and TALYS are discussed.
Development of a fast characterization setup for radionuclide generators demonstrated by a 227Ac-based generator
Authors: Krupp Dominik , Düllmann Christoph E. , Lens Lotte , Scherer Ulrich W. 
Published: February 2021

Abstract
The development of a setup for a fast online characterization of radionuclide generators is reported. A generator utilizing the mother nuclide 227Ac sorbed on a cation exchange resin is continuously eluted by using a peristaltic pump. To allow continuous and pulse-free elution of a large volume over extended time periods a 3D-printed interface designed to remove pressure-oscillations induced by the pump was placed between pump and generator column to ensure undisturbed generator elution. The eluate of the generator is passed through a 3D printed flow cell placed inside a borehole Na(Tl)-scintillation detector for high counting efficiency. Alternatively, a HPGe detector suitable for nuclide identification was used to demonstrate the validity of the online method. The detection system combines conventional gamma-ray spectrometry with fast list mode data acquisition in the Matlab software package. Elution experiments were performed at different flow rates of hydrochloric acid, separating 211Bi (t
1/2 = 2.14 min) free from its parent nuclides. In addition, to prove the versatility of the setup, experiments at different hydrochloric acid concentrations were performed resulting in the elution of pure 211Pb (t
1/2 = 36.1 min) and 223Ra (t
1/2 = 11.43 d), respectively.
Towards a stratified metafunctional model of animation
Authors: He Yufei 
Published: February 2021

AbstractAnimation is widely acknowledged for dynamically visualizing information and has been increasingly used in educational context. However, the growing presence of educational animation has not been accompanied by well-informed studies that focus on the semiotic features of animation. An emerging perspective influenced by Social Semiotics and Systemic Functional Linguistics greatly complements the current trend of animation studies in the field of science education. Studies taking that perspective model animation as stratified systems (consisting of an expression plane and a content plane) of meaning-making options. Building on their work, this paper further develops the systems of animation on the two planes. Besides the concept of stratification, this paper also introduces a metafunctional perspective for the modeling of animation, focusing on building the ideational meaning system and textual meaning system for animation on the content plane based on an examination of online science animations. It is found that educational animation is not homogenous: animation can construe different human experience and can be used to fulfill different functions. The paper closes with a discussion of the advantages of adopting a stratified metafunctional model in studying animation and the implications for future studies in the field of multimodal semiotics and science education.
Hyper(in)visibility and urban-mediatic populism in São Paulo: a sociosemiotic approach
Authors: Demuru Paolo 
Published: February 2021

Abstract
The aim of this article is to tackle the sociosemiotic strategies through which the relation between power and visibility is articulated in today’s metropolitan São Paulo. Drawing on the theoretical-methodological framework of Greimasian and post-Greimasian semiotics, the following hypotheses are put forth: (1) contemporary São Paulo is characterized by a true visual hypertrophy, which manifests itself, all at once, in both its architectural and mediatic landscapes; (2) in São Paulo, power is hypervisible and apparently transparent; (3) the excess of images, gazes, and perspectives produces, in São Paulo, dense and wide areas of topological, mediatic, and social invisibility; (4) the predominant visibility in São Paulo can be qualified as a “populist” visibility. Based on these assumptions, this article intends to contribute to the consolidation of a critical debate on the visual matrices of power and on social processes of exclusion and inclusion currently in place in global metropolises. Likewise, it is intended to contribute to the elaboration of a theoretical-methodological framework capable of understanding and addressing the complexity of the phenomena that characterize such debate.