bluuebunny/crossref_metadata_2025 huggingface dataset:
University Students’ Knowledge, Attitudes, and Behaviors Related to Marine Environment Pollution
Authors: Gan Yongtao , Gao Jian , Zhang Jiahao , Wu Xia , Zhang Tian , Shao Mengjun
Published: December 2022

Recent research on marine environment pollution (MEP) has primarily focused on legislative and market-based instruments rather than on understanding related knowledge, attitudes, and behaviors. Within this context, we used a survey of university students in China to investigate attitudes and behaviors related to MEP. Specifically, we employed a tri-component attitude model to analyze questionnaire data from 446 randomly selected students. Our results indicate that participants had a good knowledge of MEP. Furthermore, our data revealed the following three MEP-related attitudinal clusters: activists, supporters, and onlookers. Activists showed negative attitudes toward MEP with strong anti–MEP behaviors. Supporters also had negative attitudes toward MEP but performed less anti–MEP behaviors. Finally, onlookers exhibited indifferent attitudes with neutral MEP-related behaviors. Each of the three attitudinal clusters varied according to the demographic characteristics of the participants. The implications of these results on the reduction in MEP were discussed.
Trends in Telecare Use among Community-Dwelling Older Adults: A Scoping Review
Authors: Korkmaz Yaylagul Nilufer , Kirisik Hande , Bernardo Joana , Dantas Carina , van Staalduinen Willeke , Illario Maddalena , De Luca Vincenzo , Apóstolo João , Silva Rosa
Published: December 2022

A scoping review was conducted to map and analyze the concept of telecare services and the trends in telecare use. This scoping review was conducted according to Arksey and O’Malley’s framework. A search was conducted in CINAHL (via EBSCO), ERIC, Academic Search Ultimate, and MEDLINE/PubMed databases. This scoping review considered quantitative (e.g., analytical observational studies, including prospective and retrospective cohort studies, case-control, analytical cross-sectional, and descriptive-observational studies), qualitative (e.g., phenomenology, grounded theory, ethnography, and action research), and mixed-method primary studies. Forty research articles published from 1 January 2012, to 1 January 2022 were included in this review, these studies met the eligibility criteria as all were focused on telecare and targeting older adults over 65 living at home. The reviewers coded the data in an Excel spreadsheet, including the articles’ title, year, author, journal information and subject, research methods, sample size, location, and summary. Then, the researchers analyzed the conceptual definitions, measurement techniques, and findings in detail and the findings were grouped into categories. The trends around the concept of telecare are independent living, remote care, aging in place, and safety. Telecare research focuses mainly on service use, chronic illness, ethics, and cost-effectiveness. Technology acceptance among older individuals is a critical factor for telecare use. The results found in the literature about the cost-effectiveness of telecare are inconsistent.
Perception of Healthcare Providers during the COVID-19 Pandemic: A Mixed Method Survey in an Integrated Healthcare Delivery System in Saudi Arabia
Authors: Alamri Ali Faris , Alomari Fahad Khamees , Danash Amir Moustafa , Aljoudi Maram Talal , Almasharqa Asmahan Issa , Almasloot Ahmed Metwally , Alwhaibi Reem M. , Hasan Mohamed Mossad , Zaidi Uzma
Published: December 2022

During the COVID-19 pandemic, telemedicine was broadly adopted for patient care. Considering this experience, it is crucial to understand the perceptions of teleclinic healthcare professionals. In Saudi Arabia, telemedicine literature was restricted to physicians working in government and private hospitals. This study examined perceptions in relation to telemedicine among physicians and other healthcare professionals practicing in Saudi Arabian military hospitals in the Taif region. During COVID-19, telemedicine was implemented in military hospitals; consequently, this study assists in evaluating introduced practices and the perceptions of health professionals regarding these new practices. A quantitative, descriptive, correlational, and cross-sectional study was undertaken on healthcare professionals (N = 153). Twenty (20) items based on standardized measures were used to collect data using an online questionnaire. The measures contained three subscales: perceived usefulness, perceived ease, and behavioral intention. It was hypothesized that the perception of teleclinic usefulness and ease score by healthcare providers would be significantly correlated with behavioral intention. Descriptive statistics for mean, frequency, and standard deviation, as well as a Pearson correlation coefficient and regression analysis, were conducted to assess the relationship and predictive association between variables. In addition, a focus group discussion was organized to collect information directly from healthcare professionals. Most of the participants were approximately 40 years of age, Saudi Nationals (63%), medical specialists (62%), and were involved in teleclinic practices before the COVID-19 pandemic (60%). The reliability of all three scales was determined to be acceptable (α = 0.75–0.91). Perceived usefulness and perceived ease were shown to be significantly correlated with behavioral intention (r = 0.877, p = 0.05). In addition, the regression analysis indicated that perceived usefulness and perceived ease are predictors of the behavioral intention (R2 = 0.777, F (2,152) = 261.76, p = 0.001) of teleclinic practices among healthcare professionals. The positive perception of telemedicine integration in healthcare systems revealed by this study is a major catalyst for continuous adoption. On the other hand, certified telemedicine platforms, on-the-job training, Internet of things, and a flexible approach are required to find opportunities and enhancements in telemedicine interactions.
Feasibility of a Culturally Specific DEmentia Competence Education for Nursing Home Taskforce (DECENT) Programme: A Mixed-Method Approach
Authors: Zhao Yayi , Ding Yaping , Liu Li , Chan Helen Y. L.
Published: December 2022

Although educational resources have been developed to build staff‘s dementia care competence in Western culture, their applicability and cultural relevance to the Chinese population are questionable. To address this gap, the DEmentia Competence Education for Nursing home Taskforce (DECENT) programme was developed and tailored to Chinese staff. This study aimed to evaluate the feasibility and preliminary effects of the DECENT programme. A one-group pretest–posttest study, embedded with a qualitative component, was conducted among 12 healthcare professionals. The DECENT programme comprised eight topics covering essential competencies in dementia care. It was delivered face-to-face by a qualified educator once per week for 60–90 min over 8 weeks. Outcomes were measured at baseline and immediately post-intervention. A satisfaction survey and individual interviews were conducted post-intervention to understand participants’ perceptions and experience with the intervention. Nine participants finished the post-intervention assessment. Except for staff’s attitudes towards people with dementia, quantitative findings generally demonstrated positive changes following the intervention. Three categories were identified from the qualitative data: well-developed programme, perceived benefits, and barriers. The findings showed that the DECENT programme is feasible and is perceived by nursing home staff as relevant and useful to daily practice. A larger-scale study is needed to evaluate its effectiveness.
A Qualitative Study on the Motivators, Barriers and Supports to Participation in a Pediatric Produce Prescription Program in Hawai‘i
Authors: Esquivel Monica , Higa Alicia , Guidry Andrea , Shelton Cherese , Okihiro May
Published: December 2022

Produce prescriptions that provide vouchers to individuals to purchase fresh FVs at a specified retail outlet have the potential to positively impact food security status, diet, and chronic disease risk. However, maximizing program participation is vital to ensuring program success. This research describes motivators, barriers, and support for participation in a child produce prescription program among a population of Native Hawaiian and Other Pacific Islanders, who are underrepresented in this field of research. This qualitative grounded theory study was nestled within a quasi-experimental pilot intervention trial and included semi-structured interviews with pediatric program participants. Twenty-five interviews were conducted, which represented one-third of program participants. The top support factors for program participation included: ease of voucher use, program convenience, health center/pediatrician endorsement and positive communications with farmers’ market vendors. Key motivators for program participation were produce enjoyment, child support, financial support, and positive impacts on family. Three themes emerged consistently as barriers to participation amongst participants, (1) difficult use of vouchers, (2) conflicting schedules, and (3) online market concerns. (4) Conclusions: This research offers insight into policy implications as the number of produce prescription programs has grown. These findings suggest that key program design characteristics can enhance and support program participation.
The Relationship between Social Frailty and Depressive Symptoms in the Elderly: A Scoping Review
Authors: Qi Xiaojing , Li Jie
Published: December 2022

Background: Various studies have highlighted the correlation between social frailty and depressive symptoms in the elderly. However, evidence of how these two domains influence each other is not clear. The purpose of this scoping review is to summarize the current literature examining social frailty and depressive symptoms. Method: We conducted a scoping review allowing for the inclusion of multiple methodologies to examine the extent and range of this research topic. Result: The search initially yielded 617 results, 14 of which met the inclusion criteria. Five studies were identified from China, six were identified from Japan, two were identified from Korea, one was identified from Ghana, and one was from Asia. The evidence reviewed indicated that five studies met category 5 criteria, and the others met level 3 criteria. The findings from these studies showed that there is a significant relationship between social frailty and depressive symptoms. Conclusion: This scoping review shows that worse social frailty contributes to a significant degree of depression. Further research on screening social frailty and possible interventions in community and medical settings to prevent the elderly from developing depressive symptoms is needed.
Triptolide Attenuates Muscular Inflammation and Oxidative Stress in a Delayed-Onset Muscle Soreness Animal Model
Authors: Hsu Che-Chia , Tsai Chin-Chuan , Ko Po-Yen , Kwan Ting-Hsien , Liu Ming-Yie , Wu Po-Ting , Jou I-Ming
Published: December 2022

Delayed-onset muscle soreness (DOMS) is associated with exercise-induced muscle damage and inflammation, which is mainly caused by prolonged eccentric exercise in humans. Triptolide, an extract from the Chinese herb Tripterygium wilfordii Hook F, has been used for treating autoimmune and inflammatory diseases in clinical practice. However, whether triptolide attenuates acute muscle damage is still unclear. Here, we examined the effect of triptolide on carrageenan-induced DOMS in rats. Rats were injected with 3% of carrageenan into their muscles to induce acute left gastrocnemius muscular damage, and triptolide treatment attenuated carrageenan-induced acute muscular damage without affecting hepatic function. Triptolide can significantly decrease lipid hydroperoxide and nitric oxide (NO) levels, proinflammatory cytokine production, and the activation of nuclear factor (NF)-ĸB, as well as increase a reduced form of glutathione levels in carrageenan-treated rat muscles. At the enzyme levels, triptolide reduced the inducible nitric oxide synthase (iNOS) expression and muscular myeloperoxidase (MPO) activity in carrageenan-treated DOMS rats. In conclusion, we show that triptolide can attenuate muscular damage by inhibiting muscular oxidative stress and inflammation in a carrageenan-induced rat DOMS model.
Cas9-Mediated Nanopore Sequencing Enables Precise Characterization of Structural Variants in CCM Genes
Authors: Skowronek Dariush , Pilz Robin A. , Bonde Loisa , Schamuhn Ole J. , Feldmann Janne L. , Hoffjan Sabine , Much Christiane D. , Felbor Ute , Rath Matthias
Published: December 2022

Deletions in the CCM1, CCM2, and CCM3 genes are a common cause of familial cerebral cavernous malformations (CCMs). In current molecular genetic laboratories, targeted next-generation sequencing or multiplex ligation-dependent probe amplification are mostly used to identify copy number variants (CNVs). However, both techniques are limited in their ability to specify the breakpoints of CNVs and identify complex structural variants (SVs). To overcome these constraints, we established a targeted Cas9-mediated nanopore sequencing approach for CNV detection with single nucleotide resolution. Using a MinION device, we achieved complete coverage for the CCM genes and determined the exact size of CNVs in positive controls. Long-read sequencing for a CCM1 and CCM2 CNV revealed that the adjacent ANKIB1 and NACAD genes were also partially or completely deleted. In addition, an interchromosomal insertion and an inversion in CCM2 were reliably re-identified by long-read sequencing. The refinement of CNV breakpoints by long-read sequencing enabled fast and inexpensive PCR-based variant confirmation, which is highly desirable to reduce costs in subsequent family analyses. In conclusion, Cas9-mediated nanopore sequencing is a cost-effective and flexible tool for molecular genetic diagnostics which can be easily adapted to various target regions.
Genomic Diversity and Chromosomal Rearrangements in Neisseria gonorrhoeae and Neisseria meningitidis
Authors: Shaskolskiy Boris , Kravtsov Dmitry , Kandinov Ilya , Dementieva Ekaterina , Gryadunov Dmitry
Published: December 2022

Chromosomal rearrangements in N. gonorrhoeae and N. meningitidis were studied with the determination of mobile elements and their role in rearrangements. The results of whole-genome sequencing and de novo genome assembly for 50 N. gonorrhoeae isolates collected in Russia were compared with 96 genomes of N. gonorrhoeae and 138 genomes of N. meningitidis from the databases. Rearrangement events with the determination of the coordinates of syntenic blocks were analyzed using the SibeliaZ software v.1.2.5, the minimum number of events that allow one genome to pass into another was calculated using the DCJ–indel model using the UniMoG program v.1.0. Population-level analysis revealed a stronger correlation between changes in the gene order and phylogenetic proximity for N. meningitidis in contrast to N. gonorrhoeae. Mobile elements were identified, including Correa elements; Spencer-Smith elements (in N. gonorrhoeae); Neisserial intergenic mosaic elements; IS elements of IS5, IS30, IS110, IS1595 groups; Nf1–Nf3 prophages; NgoФ1–NgoФ9 prophages; and Mu-like prophages Pnm1, Pnm2, MuMenB (in N. meningitidis). More than 44% of the observed rearrangements most likely occurred with the participation of mobile elements, including prophages. No differences were found between the Russian and global N. gonorrhoeae population both in terms of rearrangement events and in the number of transposable elements in genomes.
Gallium (III) Complexes Based on Aminobisphenolate Ligands: Extremely High Active ROP-Initiators from Well-Known and Easily Accessible Compounds
Authors: Mankaev Badma N. , Hasanova Leyla F. , Churakov Andrei V. , Egorov Mikhail P. , Karlov Sergey S.
Published: December 2022

We report herein the synthesis and full characterizations of the first examples of gallium complexes based on “privileged” aminobisphenolate ligands which are easily available. These complexes turned out to be extremely active in the ring-opening polymerization of ε-caprolactone even at room temperature and highly active in the ROP of L-lactide. The combination of factors such as the easy availability of these compounds and the supposedly low toxicity, together with the extremely high activity in ROP, allows us to consider these compounds as suitable for use on an industrial scale for the synthesis of biodegradable polymers for biomedical applications.
Analysis and Functional Verification of PlPM19L Gene Associated with Drought-Resistance in Paeonia lactiflora Pall.
Authors: Meng Jiasong , Guo Jinhui , Li Tingting , Chen Zijie , Li Miao , Zhao Daqiu , Tao Jun
Published: December 2022

The herbaceous peony (Paeonia lactiflora Pall.) is widely cultivated as an ornamental, medicinal and edible plant in China. Drought stress can seriously affect the growth of herbaceous peony and reduce its quality. In our previous research, a significantly differentially expressed gene, PM19L, was obtained in herbaceous peony under drought stress based on transcriptome analysis, but little is known about its function. In this study, the first PM19L that was isolated in herbaceous peony was comprised of 910 bp, and was designated as PlPM19L (OP480984). It had a complete open reading frame of 537 bp and encoded a 178-amino acid protein with a molecular weight of 18.95 kDa, which was located in the membrane. When PlPM19L was transferred into tobacco, the transgenic plants had enhanced tolerance to drought stress, potentially due to the increase in the abscisic acid (ABA) content and the reduction in the level of hydrogen peroxide (H2O2). In addition, the enhanced ability to scavenge H2O2 under drought stress led to improvements in the enzyme activity and the potential photosynthetic capacity. These results combined suggest that PlPM19L is a key factor to conferring drought stress tolerance in herbaceous peony and provide a scientific theoretical basis for the following improvement in the drought resistance of herbaceous peony and other plants through genetic engineering technology.
The Pivotal Role of Protein Phosphatase 2A (PP2A) in Brain Tumors
Authors: Cucinotta Laura , Filippone Alessia , Casili Giovanna , Lanza Marika , Bova Valentina , Capra Anna Paola , Giuffrida Raffaella , Colarossi Cristina , Sciacca Dorotea , Paterniti Irene , Cuzzocrea Salvatore , Campolo Michela , Esposito Emanuela
Published: December 2022

Protein phosphatase 2A (PP2A) is a highly complex heterotrimeric Ser/Thr phosphatase that regulates many cellular processes. PP2A is dysregulated in several human diseases, including oncological pathology; interestingly, PP2A appears to be essential for controlling cell growth and may be involved in cancer development. The role of PP2A as a tumor suppressor has been extensively studied and reviewed. To leverage the potential clinical utility of combination PP2A inhibition and radiotherapy treatment, it is vital that novel highly specific PP2A inhibitors be developed. In this review, the existing literature on the role of PP2A in brain tumors, especially in gliomas and glioblastoma (GBM), was analyzed. Interestingly, the review focused on the role of PP2A inhibitors, focusing on CIP2A inhibition, as CIP2A participated in tumor cell growth by stimulating cell-renewal survival, cellular proliferation, evasion of senescence and inhibition of apoptosis. This review suggested CIP2A inhibition as a promising strategy in oncology target therapy.
Research Advances in Mechanical Properties and Applications of Dual Network Hydrogels
Authors: Ning Xuanjun , Huang Jiani , A Yimuhan , Yuan Ningning , Chen Cheng , Lin Donghai
Published: December 2022

Hydrogels with a three-dimensional network structure are particularly outstanding in water absorption and water retention because water exists stably in the interior, making the gel appear elastic and solid. Although traditional hydrogels have good water absorption and high water content, they have poor mechanical properties and are not strong enough to be applied in some scenarios today. The proposal of double-network hydrogels has dramatically improved the toughness and mechanical strength of hydrogels that can adapt to different environments. Based on ensuring the properties of hydrogels, they themselves will not be damaged by excessive pressure and tension. This review introduces preparation methods for double-network hydrogels and ways to improve the mechanical properties of three typical gels. In addition to improving the mechanical properties, the biocompatibility and swelling properties of hydrogels enable them to be applied in the fields of biomedicine, intelligent sensors, and ion adsorption.
DEGAIN: Generative-Adversarial-Network-Based Missing Data Imputation
Authors: Shahbazian Reza , Trubitsyna Irina
Published: December 2022

Insights and analysis are only as good as the available data. Data cleaning is one of the most important steps to create quality data decision making. Machine learning (ML) helps deal with data quickly, and to create error-free or limited-error datasets. One of the quality standards for cleaning the data includes handling the missing data, also known as data imputation. This research focuses on the use of machine learning methods to deal with missing data. In particular, we propose a generative adversarial network (GAN) based model called DEGAIN to estimate the missing values in the dataset. We evaluate the performance of the presented method and compare the results with some of the existing methods on publicly available Letter Recognition and SPAM datasets. The Letter dataset consists of 20,000 samples and 16 input features and the SPAM dataset consists of 4601 samples and 57 input features. The results show that the proposed DEGAIN outperforms the existing ones in terms of root mean square error and Frechet inception distance metrics.
Differential Foreign Body Reactions between Branched and Linear Glucomannan Scaffolds
Authors: Li Yuwei , Liu Yu , Campos de Souza Senio , Chao Tzuwei , Dong Lei , Sun Guoxing , Wang Chunming , Niu Yiming
Published: December 2022

The extent and patterns of foreign body reaction (FBR) influence the function and feasibility of biomaterials. Polysaccharides, as an important biomaterial category, have received increasing attention in diverse biomaterials design and biomedical applications due to their excellent polymeric and biocompatible characteristics. Their biological effects are usually associated with their monosaccharide composition or functional groups, yet the contribution of their glycan structure is still unknown. Herein, two glucomannans, similar in composition and molecular weight with differences in glycan structure, linear-chain (Konjac glucomannan, KGM), and branched-chain (Bletilla striata polysaccharide, BSP), were adopted to explore the host–biomaterials interaction. After acetyl modification, these polysaccharides were fabricated into electrospun scaffolds to reduce the impacts derived from the physical properties and surface morphology. According to a systematic study of their biological effects on immune cells and host response in a subcutaneous implantation model in vivo, it was revealed that acetyl KGM (acKGM) scaffolds caused a stronger FBR than acetyl BSP materials. Additionally, acKGM could stimulate macrophages to release pro-inflammatory cytokines, suggesting the influence of sugar chain arrangement on FBR and providing clues for the fine regulation of immune response and novel biomaterials design.
Statistical Characterization of Strain-Controlled Low-Cycle Fatigue Behavior of Structural Steels and Aluminium Material
Authors: Bazaras Žilvinas , Lukoševičius Vaidas
Published: December 2022

Probabilistic evaluation of the resistance to low-cycle deformation and failure of the critical components in the equipment used in the energy, engineering, metallurgy, chemical, shipbuilding, and other industries is of primary importance with the view towards their secure operation, in particular, given the high level of cyclic loading acting on the equipment during its operation. Until recently, systematic probabilistic evaluation has been generally applied to the results of statistical and fatigue investigations. Very few investigations applying this approach to the low-cycle domain. The present study aims to substantiate the use of probabilistic calculation in the low-cycle domain by systematic probabilistic evaluation of the diagrams of cyclic elastoplastic deformation and durability of the materials representing the major types of cyclic properties (hardening, softening, stabilization) and investigation of the correlation relationships between mechanical properties and cyclic deformation and failure parameters. The experimental methodology that includes the calculated design of the probabilistic fatigue curves is also developed and the curves are compared to the results of the experiment. Probabilistic values of mechanical characteristics were determined and calculated low-cycle fatigue curves corresponding to different failure probabilities, to assess them from the probabilistic perspective. A comparison of low-cycle fatigue curves has shown that the durability curves generated for some materials using analytical expressions are not accurate. According to the analysis of the relative values of experimental probabilities of low-cycle fatigue curves, the use of analytical expressions to build the curves can lead to a significant error. The results obtained allow for the revision of the load bearing capacity and life of the structural elements subjected to cyclic elastoplastic loading in view of the potential scattering of mechanical properties and resistance parameters to low-cycle deformation and failure. In addition, the results enable determination of the scatter tolerances, depending on the criticality of the part or structure.
Identification of Hyperelastic Material Parameters of Elastomers by Reverse Engineering Approach
Authors: Yenigun Burak , Gkouti Elli , Barbaraci Gabriele , Czekanski Aleksander
Published: December 2022

Simulating the mechanical behavior of rubbers is widely performed with hyperelastic material models by determining their parameters. Traditionally, several loading modes, namely uniaxial tensile, planar equibiaxial, and volumetric, are considered to identify hyperelastic material models. This procedure is mainly used to determine hyperelastic material parameters accurately. On the contrary, using reverse engineering approaches, iterative finite element analyses, artificial neural networks, and virtual field methods to identify hyperelastic material parameters can provide accurate results that require no coupon material testing. In the current study, hyperelastic material parameters of selected rubbers (neoprene, silicone, and natural rubbers) were determined using an artificial neural network (ANN) model. Finite element analyses of O-ring tension and O-ring compression were simulated to create a data set to train the ANN model. Then, the ANN model was employed to identify the hyperelastic material parameters of the selected rubbers. Our study demonstrated that hyperelastic material parameters of any rubbers could be obtained directly from component experimental data without performing coupon tests.
Fabrication of SiCN(O) Aerogel Composites with Low Thermal Conductivity by Wrapping Mesoporous Aerogel Structures over Mullite Fibers
Authors: Wang Wei , Pang Le , Jiang Ming , Zhu Yaping , Wang Fan , Sun Jingwen , Qi Huimin
Published: December 2022

Silicon-based ceramic aerogels obtained by the polymer pyrolysis route possess excellent thermophysical properties, but their poor mechanical properties limit their broader applicability in thermal insulation materials. Herein, SiCN(O) ceramic aerogels were prepared under the toughening effect of a crosslinker (hexamethylene diisocyanate, HDI), which maintains the structural integrity of the aerogel during the wet gel-to-aerogel conversion. The aerogel maintained a high surface area (88.6 m2 g−1) and large pore volume (0.21 cm3 g−1) after pyrolysis. Based on this, mullite-fiber-reinforced SiCN(O) aerogels composites with outstanding thermal insulation properties and better mechanical performance were synthesized via ambient pressure impregnation. Furthermore, the effect of the impregnation concentration on the mechanical and insulation properties of the composites was investigated. The results revealed that the composite prepared with a solution ratio of 95 wt.% exhibited a low density (0.11 g cm−3) and a low thermal conductivity (0.035 W m−1 K−1), indicating an ~30% enhancement in its thermal insulation performance compared to the mullite fiber; the mesoporous aerogel structures wrapped on the mullite fibers inhibited the gas thermal conduction inside the composites.
Experimental and Numerical Investigation into the Stability Behaviour of Cable-Stiffened Steel Columns
Authors: Li Pengcheng , Zhao Xuxiang , Qiu Jianyue , Qian Jianghua , Zhu Zhao , Zhang Zhigang , Meng Lei
Published: December 2022

A cable-stiffened steel column (CSSC) possesses superior stability behaviour compared to ordinary compression columns. In the past, the research emphasis has focused on the behaviours of stiffened columns under axial compression; investigations into their behaviour under eccentric loading is scant. This study aims to examine the buckling behaviour of CSSCs under eccentric loading using experimental and numerical investigations. The effects of pretension in cables and eccentricity on stability behaviours were studied. According to the current investigation, it can be demonstrated that the capacities of CSSCs are higher than those of ordinary compression columns. It has also been illustrated that both the buckling loads and modes of CSSCs can be changed by changing the load eccentricity; however, the modes of ordinary columns cannot be changed. These results could be of theoretical and engineering significance in the exploration of the behaviours of cable-stiffened columns.
Effect of Retrograded Starch Hydrogel on the Hygroscopic and Durability Properties of Clay Composites
Authors: Trambitski Yahor , Kizinievič Olga , Kizinievič Viktor
Published: December 2022

This study is devoted to assessing the hygroscopic and durability properties of a clay composite with the addition of a natural polymer. Modified polymer-retrograded starch hydrogel (RSH) of various concentrations (2.5, 5.0, 7.5, and 10.0%) and heating times (3 and 5 h) were used as clay stabilizers. The introduction of retrograded starch tends to increase the drying rate of clay composites at the early period of 0–4 days without the formation of shrinkage defects. Moisture uptake increased by 29% (from 140 to 180 g/m2) over the control clay composite without RSH. The hysteresis rate of the clay samples modified with RSH decreased by half (from 0.3 to 0.15%), but the hygroscopic properties were better. The use of RSH polymer increased the durability (water erosion resistance) of the clay composite. The obtained composite has great potential for indoor use due to its high moisture-regulating and durability properties.
Effect of Stitching, Stitch Density, Stacking Sequences on Low-Velocity Edge Impact and Compression after Edge Impact (CAEI) Behavior of Stitched CFRP Laminates
Authors: Lai Jiamei , Peng Ze , Huang Zhichao , Li Meiyan , Mo Mingzhi , Liu Bangxiong
Published: December 2022

Low-velocity edge impact and compression after edge impact (CAEI) behavior of stitched carbon-fiber-reinforced plastic (CFRP) laminates were experimentally investigated in the paper. Five groups, including three stacking sequences (P1, P2, P3) and two stitch densities (stitch space × stitch pitch is 10 mm × 10 mm and 15 mm × 15 mm) of stitched/unstitched CFRP laminates, were prepared by the VARTM technique and subjected to low-velocity edge impact and compression after edge impact experiments. The damage of CFRP laminates was detected by optical observation and micro-CT. The effects of stitching, stitch density, stacking sequences and impact energy on properties of edge impact and CAEI were discussed. The results show that the damage of edge impact of stitched laminates is smaller than that of unstitched laminates. The main failure mode of CAEI of the unstitched laminates is delamination and that of the stitched laminates is global buckling. The addition of stitches can effectively improve the edge impact resistance and damage tolerance of CFRP laminates. Compared with the unstitched laminates with the same stacking sequence, the peak impact force of the laminates with stitch density 15 mm × 15 mm increases by 5.61–12.43%, and the increase in residual compression strength is up to 5–20.9%. The peak impact force of the laminates with stitch density 10 mm × 10 mm increases by 8.1–31.4%, and the increase in residual compression strength is up to 24.2–27%. Compared with the other two stacking sequences (P1 and P2), the stacking sequence P3 has excellent resistance of edge impact and CAEI properties.
Corrosion Behavior of Nitrogen-Containing Low-Nickel Weld Cladding in KCl-MgCl2 Eutectic Molten Salt at 900 °C
Authors: Yang Taisen , Su Yunhai , Dai Zhiyong , Wang Yingdi , Liang Xuewei , Wei Zuyong
Published: December 2022

In this paper, the element nitrogen (N) is used to partially replace the element nickel (Ni) in flux-cored wire. A 44%Ni-24%Cr-0.18N nitrogen-containing low-nickel flux-cored wire with excellent corrosion resistance is prepared. The corrosion behavior of nitrogen-containing low-nickel weld cladding and Inconel 625 weld cladding in 40 KCl + 60 MgCl2 (wt%) molten salt at 900 °C is studied. The results show that the selective dissolution of Cr occurs in both weld claddings. The corrosion resistance of the 44%Ni-24%Cr-0.18N nitrogen-containing low-nickel weld cladding is better than that of the Inconel 625 weld cladding. The reason is that added N can react with H+ in molten salt to generate NH4+, remove corrosive impurities of MgOH+ in molten salt and change the corrosion environment. N preferentially combines with Cr to form Cr2N, reduces the diffusion precipitation of Cr and improves the corrosion resistance.
Deterioration of Mechanical Properties and the Damage Constitutive Model of Corroded Steel in an Industrial Environment
Authors: Zhang Zongxing , Xu Yuxuan , Qin Guangchong , Xu Shanhua , Li Rou
Published: December 2022

To investigate the degradation law of the mechanical properties of corroded steel, the standard specimens from machining steel members in service for 9 years in an industrial environment were subjected to tensile tests. The influences of different degrees and types of corrosion on the fracture path, stress-strain curve, and mechanical properties of specimens were discussed. Finally, the damage constitutive model of corroded steel was established based on the damage mechanics theory. The results showed that the failure modes of corroded specimens were related to the degrees and types of corrosion. The fracture morphology of specimens with general corrosion were step-like and the fractures of steel were uneven. However, those with local corrosion were mainly flat-like, and the fracture path was along the cross section where the larger corrosion pits were located. The fracture path of the specimen was related to the interaction of the corroded surface and internal material defects (holes). Meanwhile, with the increase of corrosion degree, the yield platform of stress-strain curve gradually became shorter, or even disappeared, and the ultimate strain and elongation at break decreased, implying that the ductility of steel became worse. Ultimately, the good agreement between the curves of the model and test indicated that the damage model could reflect the damage development process of corroded steel in the tensile process better. Corrosion damage resulted in the decrease in the damage threshold, and the damage variable D decreased by the time fracture occurred and the maximum reduction rate was up to 62.5%.
Recrystallization of Si Nanoparticles in Presence of Chalcogens: Improved Electrical and Optical Properties
Authors: Vinokurov Alexander , Popelensky Vadim , Bubenov Sergei , Kononov Nikolay , Cherednichenko Kirill , Kuznetsova Tatyana , Dorofeev Sergey
Published: December 2022

Nanocrystals of Si doped with S, Se and Te were synthesized by annealing them in chalcogen vapors in a vacuum at a high temperature range from 800 to 850 °C. The influence of the dopant on the structure and morphology of the particles and their optical and electrical properties was studied. In the case of all three chalcogens, the recrystallization of Si was observed, and XRD peaks characteristic of noncubic Si phases were found by means of electronic diffraction for Si doped with S and Se. Moreover, in presence of S and Te, crystalline rods with six-sided and four-sided cross-sections, respectively, were formed, their length reaching hundreds of μm. Samples with sulfur and selenium showed high conductivity compared to the undoped material.
The Role of Mg Content and Aging Treatment on the Tensile and Fatigue Properties of Die-Cast 380 Alloy
Authors: Samuel Agnes M. , Zedan Yasser , Elsharkawi Ehab A. , Abdelaziz Mohamed H. , Samuel Fawzy H.
Published: December 2022

The main objective of this contribution was to determine the impact of magnesium (Mg) concentration and solidification rate (about 800 °C/s) on the mechanical properties of commercial A380.1 die-cast alloy. Respective amounts of 0.10%, 0.30%, and 0.50% Mg were used to establish their influence on the main tensile properties, namely, the ultimate limit, the elastic limit, and the percentage of elongation to fracture. The study also focused on the effect of magnesium on the fatigue behavior of A380.1 alloy where the role of surface defects and internal defects (porosity, oxide films, and inclusions) on the alloy fatigue life was also determined. The tensile properties were analyzed in order to optimize the heat treatments of T6 (under-aging) and T7 (over-aging). Consequently, the influence of several parameters was evaluated using tensile testing and optical and scanning electron micrography. Fatigue strength was investigated by performing rotational bending tests. The results show that the alloy tensile strength parameters improve with up to 0.3% Mg. Further addition of Mg, i.e., 0.5%, does not produce any significant improvement with respect to either traction or fatigue. It is observed that the tensile properties fluctuate according to the Guinier–Preston zones which occur during heat treatment, while the fatigue properties decrease as the Mg content increases. In contrast to a mechanical fatigue failure mechanism, in the present study, cracks were initiated at the sample’s outer surface and then propagated toward the center.
Study on the Roasting Process of Guisha Limonite Pellets
Authors: Zhang Chuang , Zhou Xiaolei , Gao Lei , Fang Haoyu
Published: December 2022

In this paper, a pelletizing method has been researched to enhance the subsequent iron-making process applying Guisha limonite, with advantages including large reserves and low price. The purpose is to provide an alternative for the sinter, thus reducing the greenhouse gas emission during the iron-making process. The response surface method is used to optimize the experimental design of the pelleting process. A multivariate regression model for estimating the compressive strength of pellets was developed using Box–Behnken experimental methodology, where the relevant factors were the roasting temperature, pellet diameter, and bentonite content. The maximum influencing factors of each experimental design response are determined using analysis of variance (ANOVA). Under optimum conditions, the compressive strength of pure limonite pellets is 2705 N, similar to the response goal value of 2570.3 N, with a relative error of 5.20%. Since the high-grade iron ore resources are depleted, the comprehensive utilization of ore resources is becoming increasingly important. The aim of this paper was to provide a valuable technical foundation for lignite pellet-roasting processes in the iron and steel industries, since steel companies is increasing its imports of Guisha limonite.
Experimental Study on Early Strength and Hydration Heat of Spodumene Tailings Cemented Backfill Materials
Authors: Deng Shunchun , Liu Lang , Yang Pan , Zhang Caixin , Lv Yin , Xie Lei
Published: December 2022

Spodumene tailing is the associated solid waste of extracting lithium from spodumene. With the increase in the global demand for lithium resources, its emissions increase yearly, which will become a key factor restricting the economic development of the mining area. Mechanical and hydration reactions, as well as the microstructure of early CSTB, are studied under different tailings–cement ratios (TCR) and solid mass concentration (SC) conditions. The results show that the uniaxial compressive strength of early CSTB has a negative exponential correlation with the decrease in TCR and a positive correlation with the increase in SC: when the age of CSTB increases to 7 days, the strength increases with the rise in SC in an exponential function, and the sensitivity of strength to TCR is higher than that of SC. Compared to other tailings cemented backfill materials, the addition of spodumene tailings reduces the sulfate ion concentration and leads to a new exothermic peak (i.e., the third exothermic peak) for the hydration exotherm of CSTB. Additionally, with the increase in TCR or decrease in SC, the height of the third exothermic peak decreases and the occurrence time is advanced. At the same time, the duration of induction phase was prolonged, the period of acceleration phase was shortened, and the total amount of heat released was significantly increased. The decrease in TCR or the increase in SC led to the rise in the number of hydration products which can effectively fill the internal pores of CSTB, enhance its structural compactness, and increase its compressive strength. The above study reveals the influence of TCR and SC on the early strength, hydration characteristics, and microstructure of CSTB and provides an essential reference for the mix design of underground backfill spodumene tailings.
The Influence of Annealing on the Microstructural and Textural Evolution of Cold-Rolled Er Metal
Authors: Chen Shiying , Wang Yixuan , Zhang Xiaowei , Li Jinying , Li Zongan , Yang Wensheng , Wu Daogao , Wang Zhiqiang , Chen Dehong , Mao Ning
Published: December 2022

The microstructural and textural evolution of 60% cold-rolling-deformation Er metal (purity ≥ 99.7%) during annealing were investigated by electron-backscattered diffraction (EBSD) and X-ray diffraction (XRD). The research results showed that the texture of the (0001) plane orientation was strengthened, but there was no apparent enhancement of the (011¯0) and (1¯21¯0) plane orientations with increasing the annealing temperature. The recrystallization frequency and grain sizes gradually stabilized after the annealing duration of more than 1 h at 740 °C; the annealing duration and the recrystallization frequency were fitted to the equation: y=1 − exp (−0.3269x0.2506). HAGBs were predominant, and the distribution of grain sizes was the most uniform after annealing at 740 °C × 1 h, which was the optimal annealing process of the Er metal with 60% cold-rolling deformation. However, the recrystallization was transferred to the substructure due to grain boundary migration and twining under an excessive annealing temperature and duration.
Thickness Dependence of Thermoelectric Properties and Maximum Output Power of Single Planar Sb2Te3 Films
Authors: Junlabhut Prasopporn , Nuthongkum Pilaipon , Harnwunggmoung Adul , Limsuwan Pichet , Hatayothai Chanon , Sakdanuphab Rachsak , Sakulkalavek Aparporn
Published: December 2022

P-type Sb2Te3 films with different thicknesses were deposited on polyimide substrates via heat treatment-assisted DC magnetron sputtering. The correlations between the thickness variance and the structure, dislocation density, surface morphology, thermoelectric properties and output power are investigated. As a result, it is clear that the film thickness and the heat treatment process during growth are related to the diffusion of deposited atoms on the substrate surface, leading to imperfection defects inside the films. The imperfections inside the films are affected by their properties. This work also presents the thermoelectric efficiency of a planar single leg of the deposited films with various thicknesses. The maximum power factor is 2.73 mW/mK2 obtained with a film thickness of 9.0 µm and an applied temperature of 100 °C. Planar Sb2Te3 produced a maximum output power of 0.032 µW for a temperature difference of 58 K.
Dynamics and Application of Modern, Smart, and Active Elements or Structures
Authors: Rusinek Rafal
Published: December 2022

The Special Issue (SI) “Dynamics and Application of Modern, Smart, and Active Elements or Structures” is focused on covering all of the newest outcomes and trends in the nonlinear mechanics of systems and structures with smart, active, and modern materials [...]
Effect of Process Parameters on Stress Field of Laser Additive Manufacturing
Authors: Liu Yulin , Li Qi , Ren Zhaohui , Jiang Zeyu , Luo Hengfa , Zhang Xingwen
Published: December 2022

In order to optimize the additive manufacturing process and find the process parameters affecting the mechanical properties of the parts, an additive manufacturing simulation model of Ti-6Al-4V titanium alloy was established, and the effects of ambient temperature, substrate thickness and wire temperature on the stress field and residual stress field were analyzed. The results show that the ambient temperature is inversely proportional to the residual stress of the cladding layer, while the substrate thickness and wire temperature are positively correlated to the residual stress of the cladding layer. When the ambient temperature increases from 0 °C to 600 °C, the maximum residual stress decreases by 36.0%, the maximum residual stress increases by 10.0% when the substrate thickness increases from 25 mm to 55 mm and the maximum residual stress increases by 7.48% when the temperature increases from 0 °C to 600 °C. The influence of the three parameters on the maximum residual stress is as follows: ambient temperature > substrate thickness > wire temperature. The research results can provide reference for stress control during actual manufacturing.
Recent Progress in Silicon Carbide-Based Membranes for Gas Separation
Authors: Wang Qing , Zhou Rongfei , Tsuru Toshinori
Published: December 2022

The scale of research for developing and applying silicon carbide (SiC) membranes for gas separation has rapidly expanded over the last few decades. Given its importance, this review summarizes the progress on SiC membranes for gas separation by focusing on SiC membrane preparation approaches and their application. The precursor-derived ceramic approaches for preparing SiC membranes include chemical vapor deposition (CVD)/chemical vapor infiltration (CVI) deposition and pyrolysis of polymeric precursor. Generally, SiC membranes formed using the CVD/CVI deposition route have dense structures, making such membranes suitable for small-molecule gas separation. On the contrary, pyrolysis of a polymeric precursor is the most common and promising route for preparing SiC membranes, which includes the steps of precursor selection, coating/shaping, curing for cross-linking, and pyrolysis. Among these steps, the precursor, curing method, and pyrolysis temperature significantly impact the final microstructures and separation performance of membranes. Based on our discussion of these influencing factors, there is now a good understanding of the evolution of membrane microstructures and how to control membrane microstructures according to the application purpose. In addition, the thermal stability, oxidation resistance, hydrothermal stability, and chemical resistance of the SiC membranes are described. Due to their robust advantages and high separation performance, SiC membranes are the most promising candidates for high-temperature gas separation. Overall, this review will provide meaningful insight and guidance for developing SiC membranes and achieving excellent gas separation performance.