bluuebunny/crossref_metadata_2025 huggingface dataset:
Fracture behavior of an interface crack in a magnetoelectric sandwich structure under electric field: Effects of the poling directions
Authors: Zhao Xing , Liu JinXi , Qian ZhengHua , Gao CunFa
Published: January 2022

Magnetoelectric (ME) sandwich structure is a common form in device applications. Poling directions of component materials are essential for the improvement of ME device properties. In this paper, the effects of the electric and magnetic poling directions on the interface fracture of a ME sandwich structure are investigated by integral transform and singular integral equation techniques. The expressions of the normalized stress intensity factors (NSIFs) are derived, and some numerical examples are presented. It is found that the poling direction of active layer can greatly affect the interface cracking mode. And the crack propagation can be promoted or impeded by adjusting the applied field. The structure with a larger volume fraction of active material will be more likely to crack.
Evidence Needed for Efficacy of Antidepressant Medications Among Patients With Rheumatoid Arthritis
Authors: Silva Almodóvar Armando , Nguyen Dung , Nahata Milap C.
Published: January 2022

Patients with rheumatoid arthritis (RA) experience pain from inflammation, joint destruction, and neuropathy. Antidepressants may play a role among patients with RA and depression, fibromyalgia, or neuropathy to achieve desired outcomes. This commentary evaluated evidence for medications individually and identified important variables for future research. While we await the results of well-designed studies, a trial of duloxetine or milnacipran may be considered for patients with remnant pain and RA remission. Research is needed to evaluate the efficacy and safety of serotonin–norepinephrine reuptake inhibitors and tricyclic antidepressants in patients with RA and associated comorbid conditions.
Frequency of Thrombotic Risk Factors in Patients with Chronic Thromboembolic Pulmonary Hypertension and Acute Pulmonary Embolism: A Case-Control Study
Authors: Dodson Mark W. , Cirulis Meghan M. , Li Haojia , Yue Zhang , Brown Lynette M. , Elliott C. Gregory
Published: January 2022

Chronic thromboembolic pulmonary hypertension (CTEPH) is a serious complication of acute pulmonary embolism (PE) which remains underdiagnosed. A better understanding of risk factors for CTEPH would improve our ability to predict which PE survivors are at risk. Several medical conditions—including malignancy, splenectomy, thyroid hormone supplementation, the presence of an intravascular device, inflammatory bowel disease, osteomyelitis, and non-O blood group—have been associated with increased risk of CTEPH, primarily in studies comparing patients with CTEPH to individuals with non-thrombotic conditions. Because many of these conditions increase thrombosis risk, it remains unclear whether their association with CTEPH reflects a general effect on thrombosis risk, or a specific effect on the risk of developing CTEPH as an outcome of thrombosis. We performed a case-control study comparing the frequencies of these conditions in patients with CTEPH versus patients with acute PE who did not develop CTEPH. The conditions studied were equally frequent in the CTEPH and PE cohorts, although there was a trend towards an increased frequency of splenectomy and non-O blood group among the CTEPH cohort. Thus, other than the possible exceptions of splenectomy and non-O blood group, the investigated medical conditions do not appear likely to increase the risk of CTEPH as an outcome of acute PE, and thus are unlikely to be useful in predicting CTEPH risk among PE survivors.
Acoustic insulation characteristics of sandwich composite shell systems with double curvature: The effect of nature of viscoelastic core
Authors: Seilsepour Hasan , Zarastvand Mohamadreza , Talebitooti Roohollah
Published: January 2022

A viscoelastic model is proposed in this approach to determine the sound transmission loss coefficient of a sandwich shell system with double curvature. The structure is composed of a double-walled composite shell subjected to a viscoelastic core. Investigating the efficient impresses of rotary inertia and shear deformation, vibration equations of both outer and inner shells are extracted within the framework of shear deformation shallow shell theory. Besides, the Zener mathematical model is used for viscoelastic material, which is based on a spring connected in series with a parallel mixture of spring and dashpot. This model presents the dynamic response in the whole frequency domain at which shear modulus and bulk complex modulus are frequency dependent. Since the performed studies on the sound transmission loss of this kind of structures are insignificant, the outcomes of plate models with a viscoelastic core are used to provide a reliable sound transmission loss comparison. The results show that the applied strategy can improve the acoustic characteristics of the system at high frequencies compared to that of a single-layer one with the same mass. This issue is more highlighted while the thickness of the viscoelastic layer enhances, which confirms the positive performance of the viscoelastic materials in this range of frequency, particularly in the resonant frequency. In addition to the curvature effect on acoustic features, the vibration response of the system is configured based on various frequencies and materials.
Fuzzy decoupling predictive functional control for nonlinear hydro-turbine governing systems with mechanical time delay of the hydraulic servo system
Authors: Zhang Zhe , Wang Bin , Ma Teng , Ai Bo
Published: January 2022

This study presents fuzzy decoupling predictive functional control for nonlinear hydro-turbine governing systems with time delay and strong coupling. Here, the Takagi–Sugeno fuzzy approach and fuzzy neural network decoupling algorithm are implemented in the pretreatment of a four-dimensional time delay hydro-turbine governing system model, aiming to solve the nonlinearity and separate coupling variables of the hydro-turbine governing system effectively. Then, a new fuzzy decoupling predictive functional control strategy proposed by combining the simplified hydro-turbine governing system model and predictive function control as well as the robustness and stability of the designed controller are verified by theoretical derivation. Numerical experiment demonstrates effectiveness and superiority of the proposed approach in comparison with fuzzy control under different operation conditions.
Indigenous Trans-Systemic Research Approach
Authors: Datta Ranjan
Published: January 2022

Indigenous trans-systemic approach is a lifelong unlearning and relearning process, with no endpoint. Indigenous peoples have long called for decolonizing minds so as to support self-determination, challenge colonial practices, and value Indigenous cultural identity and pride in being Indigenous peoples. Indigenous trans-systemic approach is also a political standpoint toward valuing and revitalizing Indigenous knowledge and methodologies while weeding out colonizer biases or assumptions that have impacted Indigenous ways of knowing, doing, and being. Drawing from Indigenous Participatory Action Research (IPAR), I explained how I learned the meanings of trans-systematic knowledge from Indigenous Elders and Knowledge-keepers.
Remembering the War: An Autoethnography of Survival
Authors: Sidorenko Ewa
Published: January 2022

This is an autoethnography of World War II (WW2) survival and trauma based on a recovered family archive and a reflexive engagement with my own childhood memories. Driven by subjective imperatives to bear witness to forgotten war experiences, and to explore family mental health problems, I delve into not just personal memories but forgotten voices found in the archive whose stories have never been told thus offering a perspective of multiple subjects. My grandmother’s witness testimony of concentration camp survival recorded in 1946 compels me to research and reflect on life in the state of exception and the long-term and intergenerational impact on survivors. This autoethnographic work helps me examine the character of survival of war trauma as a form of exclusion from community and often an incomplete return from bare life to polis. Through engaging with the archive, I find some partial answers to questions about my family members, and reconstruct my family memory narrative.
Booth Attractiveness: Scale Development and Model Testing from a Mental Budgeting Perspective
Authors: Wang Jingya , Wang Yao-Chin , Zhang Lu , Fu Rachel J. C.
Published: January 2022

Given the importance of booth attractiveness at trade expositions, this study sets out to develop a scale measuring booth attractiveness (Study 1) and to examine its effectiveness in motivating attendees’ purchasing behavior (Study 2). Study 1 includes three steps: (1) item generation through a thorough review of the literature, focus group, and comments from experts, (2) item purification with exploratory factor analysis using 122 samples, and (3) reevaluating items with confirmatory factor analysis using 129 samples. A six-dimensional scale of booth attractiveness was developed in Study 1. Based on the theory of mental budgeting, Study 2 was conducted to examine the effects of booth attractiveness on the mechanism of attendees’ purchasing behavior using 323 samples. Results of Study 2 suggest that booth attractiveness could directly motivate impulse buying or indirectly through mental budgeting. Impulse buying, then, results in post-purchase guilt and anticipated satisfaction. Meanwhile, postpurchase guilt reduces anticipated satisfaction.
Examining the Attitudes of Non-Psychiatric Practicing Healthcare Workers Towards Patients With Alcohol Problems in General Hospital Setting
Authors: Tan Ho Teck , Lui Yit Shiang , Peh Lai Huat , Winslow Rasaiah Munidasa , Guo Song
Published: January 2022

Background and objectives:

Problematic alcohol-use affect the physical and mental well-being of hospitalised individuals and may receive screening and brief-intervention during treatment. Non-psychiatric doctors and nurses might respond inadequately due to negative attitudes and beliefs. This study aimed to examine these attitudes of non-psychiatric workers in the medical and surgical wards.

Methods:

A total of 457 doctors and 1643 nurses were recruited from the medical, surgical and orthopaedic disciplines over a period of 4 months. Three questionnaires were administered: demographics, Alcohol & Alcohol-Problems Perceptions Questionnaire (AAPPQ) and Staff Perception of Alcohol Treatment Resources.

Results:

About 128 doctors and 785 nurses responded. Around 75.5% doctors and 51.9% nurses endorsed role-legitimacy in the AAPPQ. Both the doctor (86.7%) and nurse (77.6%) groups agreed on the importance to initiate intervention for patients with problematic alcohol-use in daily work. Both groups were sceptical and negative towards these patients endorsing low-level role-adequacy (41.2%), role-support (36.9%), motivation (36.5%), task-specific self-esteem (25.1) as well as work satisfaction (20.5%).

Conclusion/discussion:

Doctors and nurses demonstrated low levels of therapeutic commitments towards patients with problematic alcohol-use thereby necessitating the introduction of in-house programmes to educate, empower and emphasise the importance of therapeutic contact with patients for alcohol intervention.

Scientific significance:

The prompt identification and treatment of patients with alcohol problems are contingent on the workers’ attitudes towards them. This study’s results should spark a nation-wide interest to improve the training and recognition of such patients and providing adequate educational resources.
Determinants of Early Initiation of Breastfeeding in West Belessa District, Northwest Ethiopia
Authors: Ayalew Desalew Degu , Kassie Belayneh Ayanaw , Hunegnaw Melkamu Tamir , Gelaye Kassahun Alemu , Belew Aysheshim Kassahun
Published: January 2022

Background:

The world is now suffering from malnutrition and remains one of the leading causes of death for under 5 children. Children from developing countries, including Ethiopia also suffer from undernutrition due to suboptimal breastfeeding practice. Therefore, the aim of this study was to assess the EIBF practices and determinants among children aged less than 24 months in West Belessa district, Northwest Ethiopia, 2019.

Methods:

A community-based cross-sectional study was conducted from January 2 to February 28, 2019 in the West Belessa district. A total of 569 mother-children pairs were participated in the study. Study particnapants were selected by using simple random sampling technique. The data were collected by an interviewer-administered structured questionnaire. Data were entered and analyzed by using Epi-Info version 7 and SPPS version 20, respectively. Bi-variable and Multivariable logistic regression analysis were done. Odds ratio with 95% confidence was done to determine the level of significance value less than .05 considered as significant with the outcome variable.

Result:

The prevalence of early initiation of breastfeeding (EIBF) was found to be 77.7 % (95%CI, 74.3-81.0). Age of the mother (AOR = 2.76, 95%CI [1.21, 6.27]), antenatal care (ANC) (AOR = 3.79, 95%CI [2.58, 9.94]), and number of antenatal care visit (AOR = 1.85, 95%CI [1.03, 3.85]) were significantly associated with early initiation of breastfeeding.

Conclusion and Recommendation:

In this study, more than three fourth of children were received early initiation of breastfeeding within 1 hour after delivery. Age of the mother, antenatal, and number of antenatal care were associated with EIBF. Therefore, during this contact period, improve antenatal services by increasing accessibility and providing counseling is important to improve EIBF utilization.
Smoking Mechanics and Impact on Smoking Cessation: Two Cases of Smoking Lapse Status Post Lung Transplantation
Authors: Galiatsatos Panagis , Ekpo Princess , Schreiber Raiza , Barker Lindsay , Shah Pali
Published: January 2022

Background

Smoking behavior includes mechanisms taken on by persons to adjust for certain characteristic changes of cigarettes. However, as lung function declines due to lung-specific diseases, it is unclear how mechanical smoking behavior changes affect persons who smoke. We review two cases of patients who stopped smoking prior to and then subsequently resumed smoking after lung transplantation.

Methods

A retrospective review of two patients who were recipients of lung transplantation and sustained from cigarette usage prior to transplantation.

Results

Patient A was a 54-year-old woman who received a double lung transplant secondary to chronic obstructive pulmonary disease (COPD) in October 2017. She had stopped smoking cigarettes in July 2015 (FEV1 .56 L). Patient B was a 40-year-old man who received a double lung transplantation due to sarcoidosis in January 2015. He stopped smoking cigarettes in February 2012 (FEV1 1.15 L). Post-transplant, Patient A resumed smoking on March 2018 where her FEV1 was at 2.12 L (5 months post-transplantation), and Patient B resumed smoking in April 2017 where his FEV1 was 2.37 L (26 months post-transplantation).

Conclusion

We report on two patients who resumed smoking after lung transplantation. While variations of smoking mechanics have been identified as a function of nicotine yield and type of cigarette, it lung mechanics may play a role in active smoking as well. Therefore, proper screening for tobacco usage post-lung transplantation should be considered a priority in order to preserve transplanted lungs.
On the relationship between party polarization and citizen polarization
Authors: Moral Mert , Best Robin E
Published: January 2022

Do party policy offerings simply reflect public opinion or do parties shape public demand for policies? Theories of party position-taking and the operation of democracy expect parties to track their supporters’ positions, while scholarship of public opinion has shown voters often adopt the position of their preferred parties. We apply both of these theoretical expectations to the relationship between citizen polarization and party polarization and additionally argue that the relationship between them should be stronger among politically more engaged and sophisticated citizens. We draw on aggregated survey data from 174 cross-national and national election studies from 19 established democracies, to assess the extent to which citizen polarization responds to party polarization, the extent to which parties respond to changes in citizen polarization, and whether these relationships differ across different groups of citizens. We estimate seemingly unrelated error-correction models employing data on party and citizen positions from 1971 to 2019. Our findings suggest that citizen polarization follows party polarization and also that politically engaged and sophisticated citizens are more responsive to changes in party polarization than the politically less engaged and unsophisticated. In contrast, we find little evidence that party polarization responds to changes in citizen polarization.
An improved multi-mode seismic vibration control method using multiple tuned mass dampers
Authors: Zhang Xuan , Han Qiang , Bi Kaiming , Du Xiuli
Published: January 2022

Multiple vibration modes of an engineering structure might be excited by earthquake ground motions. Multiple tuned mass dampers (MTMDs) are widely used to control these multi-mode vibrations. However, in the commonly used MTMD system, the mass element in each tuned mass damper (TMD) is normally assumed to be the same. To improve the performance of MTMDs for seismic-induced vibration control, non-uniform MTMD masses are adopted in the present study to improve the mass utilization of TMD, and a location factor is proposed to determine the best location of each TMD in the MTMD system. The effectiveness of the proposed method is validated through numerical study. The results show that the proposed method effectively reduces the seismic responses of the structure induced by multiple vibration modes.
Improving the torsional response of asymmetric buildings with self-centering controlled rocking steel braced frame system
Authors: Hafezi Maryam , Aziminejad Armin , Mansoori Mohammad Reza , Hosseini Mahmood , Moghadam Abdolreza Sarvghad
Published: January 2022

Self-centering controlled rocking steel braced-frame (SC-CR-SBF) is proposed as an earthquake-resistant system with low damage. Pre-stressed vertical strands provide a self-centering mechanism in the system and energy absorbing fuses restrict maximum displacement. Presence of asymmetry in structures can highlight the advantages of employing this structural system. Moreover, these days designing and constructing asymmetric and irregular structures is inevitable and as a result of architectural attractiveness and requirements of different functions of buildings, they are of great importance. Consequently, in these types of structures in order to minimize seismic responses, particular measures should be taken into consideration. Proper distribution of strength and stiffness throughout the plan of structures with self-centering systems can play a considerable role in resolving problems associated with asymmetry in these structures. In this study, the asymmetric buildings with 10% and 20% mass eccentricities and having different arrangements of centers were simulated. The models were analyzed under a set of 22 bidirectional far-field ground-motion records and corresponding responses of maximum roof drift, acceleration and rotation of the roof diaphragms of the structures with different arrangements of the center of mass, stiffness and strength were computed and studied. Results show that proper distribution of stiffness and strength throughout the plan of the structures with SC-CR-SBF system reduces the maximum roof drift as well as the rotation of the roof diaphragm. With appropriate arrangement of the centers, maximum drift response of the asymmetric structure decreases as much as roughly 20% and the ratio of the maximum drift response of the asymmetric structure to the response of the similar symmetric structure with the same overall stiffness and strength was 1.1. In other words, maximum drift response of the asymmetric structure with SC-CR-SBF system is acceptably close to the one for the symmetric building.
Study on shock absorption performance and damage of a new staggered story isolated system
Authors: Zhang Yafei , Liu Dewen , Fang Sitong , Lei Min , Zhu Zehua , Liao Wenyuan
Published: January 2022

The new staggered story isolated system is developed according to the base isolated system and the mid-story isolated system. Non-linear finite element model of an eighteen stories new staggered story isolated structure is established. For a comparative analysis, the models of a base isolated structure, a mid-story isolated structure, and an aseismic structure are also established, and their shock absorption performances and damages are analyzed for comparison. The results indicate that the new staggered story isolated structure has a small seismic response, good shock absorption performance which is feasible for application. Besides, the shock absorption performance of the new staggered story isolated structure is a little worse than the base isolated structure but slightly better than the mid-story isolated structure. The bottom of core tube and the story below the frame isolated story have large acceleration response which needs to be paid more attention in design.
Experimental study on mechanical behavior of orthotropic steel deck with adhesively bonded rigid pavement
Authors: HE Xinyi , SU Qingtian , JIANG Xu , WU Chong
Published: January 2022

The steel deck with rigid pavement has a lower risk of fatigue failure owing to the enhanced local rigidity. A reliable connection of steel plate and pavement and a convenient construction are critical concerns for this deck type. To seek a new application meeting the aforementioned requirements, this paper proposed a steel deck with adhesively bonded rigid pavement cast by non-reinforced ultra-high performance concrete (UHPC). To study the constructability and flexural properties of this deck type in a bridge deck system, four specimens including two with adhesively bonded connection and two reference ones with shear stud connection were fabricated and experimentally investigated by positive and negative bending tests. In addition, a simplified pretreatment of steel substrate was conducted before the application of epoxy resin to simulate the low quality of on-site construction. Experimental results indicate that the shear strength of the bonding connection with simplified steel pretreatment could decrease to half of that with strict preparation. Bending tests demonstrate that the adhesive bonding provides a more rigid connection between steel and concrete than shear studs did. The bonding failure load was 1.5 times the U-rib yielding load, indicating a high positive bending-carrying capacity of the deck. The adhesive provides better crack resistance than shear studs in negative bending. From a perspective on the bending behavior in the deck system, the adhesive bonding was reliable to obtain high bending capacities to resist actual vehicle loads. Besides, the non-uniform shrinkage of non-reinforced UHPC pavement can cause a 30% reduction of cracking strength.
A battle for truth: Islam-related counterpublic discourse on Scandinavian news media Facebook pages
Authors: Lien Anders NJ
Published: January 2022

In this article, I aim to contribute to existing literature on counterpublics by analysing the extent to which competing counterpublics regarding Islam appear in mainstream news outlets’ comment sections on Facebook. By utilising, and slightly modifying, Toepfl and Piwoni’s pioneering theoretical framework for analysing (counter)publics, I identify an Islam-hostile counterpublic and an Islam-sympathetic counterpublic that operate in the examined comment sections. I conducted a quantitative content analysis of Facebook posts (and associated articles) published by 15 established Scandinavian news outlets in 2018 ( N = 599) and the comments written by ordinary Facebook users in response ( N = 6797). I found the majority of the comments mirrored the views presented in the established media posts, but a substantial minority of the comments engaged in counterpublic discourses, contesting the bounds of established discourse around Islam in the Scandinavian public spheres.
Oral piercings and orthodontic treatment: A questionnaire-based national survey
Authors: Misra Sangeeta , Morris David , Dhaliwal Harmeet , Taha Amr , Townend Georgia
Published: January 2022

Objective:

To obtain opinions from orthodontic colleagues nationally on how they currently manage orthodontic patients with oral piercings. The secondary objectives were to assimilate the national opinions from the survey and attempt to generate educational material as an advice sheet and a patient information leaflet for the professionals and the patients respectively for the British Orthodontic Society (BOS).

Design:

Cross-sectional survey.

Setting:

Primary and secondary care orthodontic providers.

Participants:

Members of the BOS.

Methods:

An electronic questionnaire was developed and circulated to members of the BOS to obtain their opinions on the effects of oral piercings on their patients’ orthodontic treatment ‘journey’. In addition, the need for the development of informative material around the management of orthodontic treatment and appliances in patients with oral piercings was explored.

Results:

A total of 110 responses were received. However, only 88 respondents out of 110 attempted all the questions within the survey. There were 22 respondents who attempted it partially. We did include these partial responses well while analysing the results, since many of these offered personalised comments in the free-text boxes within the survey.

Conclusion:

The most common general complications associated with oral piercings were inflammation of the surrounding tissue and enamel/dentine wear. Moreover, orthodontic complications, reported commonly, were inadequate oral hygiene maintenance, entanglement with the orthodontic appliance causing damage and interference with retainers. Most respondents expressed the need for the development of a web-based patient information leaflet and an advice sheet as educational tool, both of which have been proposed to and agreed by the BOS before submission of this publication.
Effect of spark ignition location on the turbulent jet ignition characteristics in a lean burning natural gas engine
Authors: Yang Xue , Cheng Yong , Zhao Qingwu , Wang Pengcheng , Chen Jinbing
Published: January 2022

The Turbulent Jet Ignition is an effective concept to achieve stable lean burning for natural gas engines due to the multiple ignition sources, high ignition energy, and fast combustion rate. A variation of the ignition location has a non-negligible effect on the ignition performance of the TJI system. The present work aims to provide more details on this effect by numerical simulations. Both factors of the additional fuel supply to the pre-chamber and the in-cylinder flow field are taken into consideration in this study. A numerical model is built based on a lean burning natural gas engine and validated by experimental results. Five different spark ignition sources are equally arranged on the vertical axis of the pre-chamber, with different distances from the connecting orifices. Simulations are carried out under the same initial and boundary conditions except for the location of the ignition source. Combustion pressure, in-cylinder flow field, fuel mass fraction distribution, and heat release rate are analyzed to study the in-cylinder ignition and combustion process. The results show that a rotational flow and a non-uniform fuel distribution are formed in the pre-chamber during the compression stroke. The turbulent jet characteristics are significantly influenced by the coupling of two factors: the combustion rate inside the pre-chamber as well as the flame propagation distance from the ignition source to the connecting orifices. Rapid combustion rate and shorter flame propagation distance both lead to the earlier ejection of cold jets and hot jets. Among five ignition sources, the one located closest to the connecting orifices generates earlier hot jets with the highest mean velocity. The jets are more effective to ignite the lean mixture and could decrease the combustion duration of the main chamber.
A novel hybrid energy management strategy of a diesel-electric hybrid ship based on dynamic programing and model predictive control
Authors: Yuan Yupeng , Chen Mingshuang , Wang Jixiang , Yu Wanneng , Shen Boyang
Published: January 2022

The energy-saving characteristics of diesel-electric series hybrid ships largely depend on their energy management strategy. In this paper, a strategy that combines dynamic programing and model predictive control (DP-MPC) is proposed to solve the energy management problems of diesel-electric hybrid ships. The DP-MPC strategy has considered some typical working conditions of a ship, and the corresponding influence of white noise disturbance on the control strategy was studied. The simulation results show that the DP-MPC strategy has an excellent anti-interference capability. The control performance of the DP-MPC strategy is then further analyzed and compared with the rule-based logic threshold control strategy. The simulation results show that the proposed DP-MPC strategy can save 2.5% of the fuel consumption and has a better anti-interference capability than the rule-based control strategy.
Numerical simulation of the mooring capacity comparison of the subsea suspended manifold with two mooring schemes
Authors: Xu Ning , Zhao Honglin , Li Yufang , Wang Yingying , Zhang Shimin
Published: January 2022

The next-generation underwater production system (NUPS) is based on the suspension cluster manifold (SCM) as a new conceptual scheme. SCM mooring stability is essential for establishing NUPS. Therefore, comparing the SCM mooring stability in different mooring systems is vital for evaluating system adaptability. This paper detailed two mooring schemes designed for the SCM, including the steel catenary riser (SCR) mooring system and the new steep wave (NSWR) mooring system. OrcaFlex software was used to establish the mooring system model, analyzing the static motion response of the SCM under the current and fluid density. Furthermore, the mooring system adaptability in the cluster wellhead layout was also evaluated and compared. The results showed that the maximum offset of the SCM with the SCR mooring system was within 2 m under the current, while the deflection of the SCM with the NSWR mooring system was within 1.5° in extreme fluid densities. Furthermore, the SCM with the SCR mooring system displayed superior station-keeping capability in the current, while the NSWR mooring system exhibited better stability when transporting extreme fluid densities and was more adaptable in cluster wellhead layouts.
Active axial vibration control of a shaft-bearing system excited by the dynamic thrust force
Authors: Ren Mingke , Xie Xiling , Yang Dequan , Zhang Zhiyi
Published: January 2022

The axial vibration of a shaft-bearing system induced by the thrust excitation is usually composed of multiple tones. To suppress the axial vibration of the shaft-bearing system, two inertial electro-magnetic actuators are mounted symmetrically at the thrust bearing and work in parallel to exert control forces. The control signal is generated by an adaptive algorithm with subband filtering, which aims to attenuate over a broadband the vibration of the thrust bearing and its foundation induced by the dynamic thrust force. To reduce computational complexity, the recursive computation is partly realized with the auto-regressive moving average (ARMA) model. The proposed active control approach is evaluated numerically at first with the dynamic model of the shaft-bearing system and then verified with an experimental system. It is demonstrated by the numerical and experimental results that the active control approach is able to suppress the multi-tone vibration of the thrust bearing and the foundation. Moreover, in comparison to the single-band adaptive feedback algorithm, the adaptive algorithm with subband filtering is more effective when the disturbance contains multiple tones.
Assessing the investment environment in container terminals: A knowledge gap model
Authors: Hsu Wen-Kai K , Tai Hui-Huang , Tan Huynh Nguyen , Chen Jun-Wei C
Published: January 2022

This paper aims to evaluate the investment environment in container terminals (CTs) in one seaport from the attitudes of both terminal operators (TOs) and port companies (PCs). Evaluation criteria (ECs) regarding the investment environment in CTs are first created based on the prior literature and the CTs’ operational characteristics. A knowledge gap model based on an improved fuzzy AHP approach is then developed to assess the perceived differences on the ECs between TOs and PCs, by which the PCs managers could formulate practical policies to improve their investment environment in CTs. As an empirical study, the Taiwan International Port Corporation (TIPC) and its terminal operators in Kaohsiung port are examined to verify the research model. Results indicate that ECs with higher knowledge gap for TIPC include: Intra-port coopetition, Number of shipping carriers, and Business tax. Based on the result, theoretical and managerial implications are discussed.
Prediction of drag and lift forces of a high-speed vessel at full scale by CFD-based GEOSIM method
Authors: Can Ugur , Bal Sakir
Published: January 2022

In this study, it was aimed to obtain an accurate extrapolation method to compute lift and drag forces of high-speed vessels at full-scale by using CFD (Computational Fluid Dynamics) based GEOSIM (GEOmetrically SIMilar) method which is valid for both fully planing and semi-planing regimes. Athena R/V 5365 bare hull form with a skeg which is a semi-displacement type of high-speed vessel was selected with a model family for hydrodynamic analyses under captive and free to sinkage/trim conditions. Total drag and lift forces have been computed for a generated GEOSIM family of this form at three different model scales and full-scale for Fr = 0.8 by an unsteady RANS (Reynolds Averaged Navier–Stokes) solver. k–ε turbulence model was used to simulate the turbulent flow around the hulls, and both DFBI (Dynamic Fluid Body Interaction) and overset mesh technique were carried out to model the heave and pitch motions under free to sinkage/trim condition. The computational results of the model family were used to get “drag-lift ratio curve” for Athena hull at a fixed Fr number and so the corresponding results at full scale were predicted by extrapolating those of model scales in the form of a non-dimensional ratios of drag-lift forces. Then the extrapolated full-scale results calculated by modified GEOSIM method were compared with those of full-scale CFD and obtained by Froude extrapolation technique. The modified GEOSIM method has been found to be successful to compute the main forces (lift and drag) acting on high-speed vessels as a single coefficient at full scale. The method also works accurately both under fully and semi-planing conditions.
Improving the Interpretation of Random Effects Regression Results
Authors: Jordan Soren , Philips Andrew Q
Published: January 2022

Mummolo and Peterson improve the use and interpretation of fixed-effects models by pointing out that unit intercepts fundamentally reduce the amount of variation of variables in fixed-effects models. Along a similar vein, we make two claims in the context of random effects models. First, we show that potentially large reductions in variation, in this case caused by quasi-demeaning, also occur in models using random effects. Second, in many instances, what authors claim to be a random effects model is actually a pooled model after the quasi-demeaning process, affecting how we should interpret the model. A literature review of random effects models in top journals suggests that both points are currently not well understood. To better help users interested in improving their interpretation of random effects models, we provide Stata and R programs to easily obtain post-estimation quasi-demeaned variables.
Community Supported Agriculture, Human Capital, and Community Health
Authors: Martinez Celina L. , Rosero Daisy , Thomas Tammy , Soto Mas Francisco
Published: January 2022

Community supported agriculture (CSA) strengthens the local food system (LFS) and plays a critical role in promoting human capital (HC) and addressing social determinants of health (SDH). Most CSAs develop relationships that build a sense of community, and engage in activities that facilitate access to food and economic opportunities. CSAs may also contribute to personal development, education and income, working experience, and knowledge. CSA principles align with the principles of HC, specifically the pursuit of economic development. While research on the connection between CSA and HC has broadly focused on the economic aspect, the human development dimension has remained at the conceptual level. The purpose of this study was to assess the potential HC contributions by CSA and the implications for health outcomes in central/northern New Mexico. Primary and secondary data were collected through a semi-structured, open-ended questionnaire and an internet search. Purposive sampling was used to select 13 CSAs. Eight (61.5%) responded and reported activities that address HC and SDH such as training, job creation, education, access to healthy food, food security, health education and disease management, social connections, and food justice. Given the potential impact, public health must contribute to CSA by generating evidence on its health and social benefits, training practitioners on supporting local food program, and promoting policy that stimulates the local economy, fosters social relations and food justice, and empowers community members. This study calls for research and practice to take a multilevel perspective on the contribution of LFSs to equity and wellbeing.
The Relationship Between Perceived Assertiveness/Shyness and Emergent Bilinguals’ Vocabulary Intervention Outcomes: A Preliminary Investigation
Authors: Rivera Pérez Jean F. , Creaghead Nancy A. , Washington Karla , Guo Ying , Raisor-Becker Lesley , Combs Sandra G.
Published: January 2022

This preliminary study examined the relationship between clinicians’ perceptions (i.e., speech pathologists) of children’s scores on the Assertiveness scale of the Teacher-Child Rating Scale 2.1 and gains in naming and defining words following English-only or Spanish–English intervention for emergent bilinguals (EBs). Twenty-eight Spanish-speaking preschoolers were randomly assigned to participate in one of two vocabulary intervention groups: English-only ( n = 14) and Spanish-English with Spanish provided through a tablet computer ( n = 14). EBs were assessed in naming and definition before and after interventions. The clinicians provided perceptions of levels of assertiveness and shyness of both groups of EBs using the Assertiveness scale. A correlation analysis indicated a strong relationship between the Assertiveness scale and English word naming and definition gains in both groups (English-only and Spanish–English) and Spanish gains in the Spanish–English group. Clinicians’ perceptions of shyness should be considered as a variable of interest that affects response to intervention.
Results of Angioplasty With Double-Layer Mesh Stent and Protection Systems of the Extra- and Intracranial Dissection of Cephalic Arteries
Authors: Latacz Pawel , Lasocha Bartlomiej , Pawel Brzegowy , Tadeusz Popiela , Marian Simka
Published: January 2022

Purpose:

Although a majority of cervical artery dissections can be managed conservatively, patients presenting with cerebral embolization or significant stenosis require a more aggressive approach. However, complications associated with endovascular repair are quite frequent and optimal interventional technique still remains to be established.

Materials and methods:

The aim of this post hoc survey was to analyze results of endovascular treatments for symptomatic dissections of the internal carotid and vertebral arteries, which were performed under protection and with the use of double-layer mesh stents. During endovascular procedure catheters, stents and protection systems were tailored according to the angioarchitecture of dissection, particularly to its location, length and coexisting stenotic or aneurysmatic lesions. We evaluated retrospectively midterm and late results of endovascular treatment of 25 patients presenting with symptomatic dissection of cervical arteries, including 11 patients with dissections of intracranial segments of the internal carotid artery. Follow-ups were scheduled 1, 3 and 6 after the procedure, and then every 6 months. Control computed tomography (CT) or digital subtraction angiography (DSA) arteriographies were performed 1–6 months and 12 months after endovascular repair.

Results:

There were no periprocedural major adverse events. All patients completed the 12-month follow-up. There were neither fatalities nor new neurologic adverse events at the 30-day follow-up, and no such adverse events during long-term follow-up. At 12-month follow-up, in all patients, angiographies revealed patent stents, full coverage of lesions by stents and complete thrombotic closure of the pseudoaneurysms.

Conclusions:

A tailored endovascular management of symptomatic dissection of cervical arteries is safe and efficient, also in a long run.
There’s Certainly a Lot of History Here, But We’re Here to Roast Oysters: Afterlives of Trans-Atlantic Exchange in Top Chef: Charleston
Authors: Stowell Olivia
Published: January 2022

This article reads the premiere episode of Top Chef’s fourteenth season, Top Chef: Charleston (2016), for its engagement with the history of slavery in the United States, arguing that Top Chef deploys acknowledgments of historical violences for the purpose of concealing those same violences. By analyzing the discursive and visual content of Charleston’s premiere’s elimination challenge, which required two chefs to cook head-to-head at a plantation, this article outlines how race shapes the action of Top Chef both overtly and covertly, emerging as an organizing factor for the program as a whole. Charleston’s premiere episode illuminates how history is repackaged into popular discursive and material formations, while also suggesting the potential for such formations to cohere around race in unexpected and unpredictable ways.
Greater and More Natural Use of the Upper Limbs During Everyday Life by Former Amputees Versus Prosthesis Users
Authors: Frey Scott , Motawar Binal , Buchanan Kelli , Kaufman Christina , Stevens Phil , Cirstea Carmen , Morrow Sean
Published: January 2022

Hand loss profoundly impacts daily functioning. Reversal of amputation through hand replantation or transplantation offers an alternative to prosthetics for some. Whether recipients exhibit more extensive and natural limb use during everyday life than prosthesis users is, however, unknown.

We asked unilateral, below-elbow amputees (N = 22), hand graft recipients (transplants N = 4; replants N = 2), and healthy matched controls (N = 20) to wear wireless accelerometers distally on their forearms/prostheses and proximally on their upper arms. These units captured limb activity over 3 days within participants’ natural environments.

Graft recipients exhibited heavier reliance on their affected hands compared to amputees’ reliance on their prostheses, P < .001. Likewise, reliance on the injured side upper arm was also greater for hand graft recipients than amputees, regardless of whether they were wearing their prostheses, P < .05 in both cases. Hand graft recipients, like healthy controls, also relied more on forearm vs upper arm movements when controlling their limbs, P < .001.

Compared with conventional prosthesis users, graft recipients exhibited more extensive and natural functioning of the upper limbs during everyday activities. This information is an important addition to other considerations when evaluating risk-benefit of these treatment alternatives.
Energy flow and performance evaluation of inerter-based vibration isolators mounted on finite and infinite flexible foundation structures
Authors: Dong Zhuang , Yang Jian , Zhu Chendi , Chronopoulos Dimitrios , Li Tianyun
Published: January 2022

This study investigates the vibration power flow behavior and performance of inerter-based vibration isolators mounted on finite and infinite flexible beam structures. Two configurations of vibration isolators with spring, damper, and inerter as well as different rigidities of finite and infinite foundation structures are considered. Both the time-averaged power flow transmission and the force transmissibility are studied and used as indices to evaluate the isolation performance. Comparisons are made between the two proposed configurations of inerter-based isolators and the conventional spring-damper isolators to show potential performance benefits of including inerter for effective vibration isolation. It is shown that by configuring the inerter, spring, and damper in parallel in the isolator, anti-peaks are introduced in the time-averaged transmitted power and force transmissibility at specific frequencies such that the vibration transmission to the foundation can be greatly suppressed. When the inerter is connected in series with a spring-damper unit and then in-parallel with a spring, considerable improvement in vibration isolation can be achieved near the original peak frequency while maintaining good high-frequency isolation performance. The study provides better understanding of the effects of adding inerters to vibration isolators mounted on a flexible foundation, and benefits enhanced designs of inerter-based vibration suppression systems.
Improving the transmission error source tracing method for gear hobbing machines
Authors: Zhao Wanhua , Liu Zhuang , Yang Yong , Zou Zheng , Shu Ruizhi , Lei Sicong , Gao Xu
Published: January 2022

By considering the uncertainness of initial measuring position of encoders and signal sidebands caused by the fault gear pair, this paper presented a new comprehensive harmonic analysis method for the transmission error of gear hobbing machine. Based on that, a test platform was established, in which two circle grating encoders were connected to the hob spindle and workpiece spindle respectively. With the help of this new harmonic analysis method as well as the self-developed test platform, a new improved transmission error fault diagnosis method was developed for the gear hobbing machines. To verify its accountability, a case study was conducted on a YS-type gear hobbing machine. According to the spectrum amplitude comparison and the analysis of harmonic frequency distribution, the fault transmission gear pair was successfully located. This improved transmission error source tracing method was very helpful for quantifying both the manufacturing qualities and assembly qualities of parts and locating potential error source for new gear hobbing machines.