bluuebunny/crossref_metadata_2025_split huggingface dataset:
Export structure, import demand elasticity and export stability
Authors: Zhou Hua , Fan Jiachen 
Published: June 2022

AbstractThis paper optimises the definition and measurement method of export stability and analyses the impact of export structure on export stability. The main results show that (1) an increase in the export share appears to reduce the export stability of goods, by changing the importer's elasticity of import demand; (2) exporters can reduce the impact of export structure on the export stability of goods by increasing the technical complexity of export products, improving the trade freedom level and signing free trade agreements (FTA) with importers; (3) export share has a negative impact on the export stability of services; and (4) the development of intra‐industry trade (IIT) in services and the digitisation of services can reduce the impact of export structure on the export stability of services. The results can provide a reference for the management of export instability against the background of export specialisation.
Effectiveness of a fluid immersion simulation system in the acute post‐operative management of pressure ulcers: A prospective, randomised controlled trial
Authors: Joshi Chitang J. , Carabano Miguel , Perez Laura C. , Ullrich Peter , Hassan Abbas M. , Wan Rou , Liu Jing , Soriano Rachna , Galiano Robert D. 
Published: June 2022

AbstractThe fluid immersion simulation system (FIS) has demonstrated good clinical applicability. This is the first study to compare surgical flap closure outcomes of FIS with an air‐fluidised bed (AFB), considered as standard of care. The success of closure after 14 days post‐op was the primary endpoint. Secondary endpoints were incidences of complications in the first 2 weeks after surgery and the rate of acceptability of the device. Thirty‐eight subjects were in the FIS group while 42 subjects were placed in the AFB group. Flap failure rate was similar between groups (14% vs. 12%; p = 0.84). Complications, notably dehiscence and maceration, were significantly higher in the FIS group (40% vs. 17%; p = 0.0296). The addition of a microclimate regulation device (ClimateCare®) to FIS for the last 43 patients showed a significant decrease in the rate of flap failure (71% vs. 16%; p = 0.001) and incidence of complications (33% vs. 0%; p = 0.011). There was no statistically significant difference between the FIS and air‐fluidised bed (AFB) in the rate of acceptability (nurse acceptance: 1.49 vs. 1.72; p = 0.8; patient acceptance: 2.08 vs. 2.06; p = 0.17), which further illustrates the potential implementation of this tool in a patient‐care setting. Our results show that the use of ClimateCare® in combination with FIS can be a better alternative to the AFB in surgical closure of pressure ulcers.
Hexagonal Ring Origami Assemblies: Foldable Functional Structures With Extreme Packing
Authors: Leanza Sophie , Wu Shuai , Dai Jize , Zhao Ruike Renee 
Published: June 2022

Abstract
Foldable structures have been of great interest due to their ability to reduce in size from deployed to folded state, enabling easier storage in scenarios with space constraints such as aerospace and medical applications. Hexagonal structural components have been of interest, due to their ability to tessellate, or cover without gap, 2D and 3D surfaces. However, the study on effective folding strategies for hexagon-based structures and the hexagon geometry itself is limited. Here, we report a strategy of snap-folding hexagonal rings, to result in folded states with only 10.6% the initial area of a single ring. Motivated by this significant packing, we utilize a combination of experiments and finite element analysis to study effective folding strategies and packing abilities of various 2D and 3D hexagonal ring assemblies, with structures that can be folded to 1.5% and 0.4% of their initial area and volume, respectively. The effect of geometric parameters of hexagonal rings on the mechanical stability of their assemblies is investigated. Additionally, the instabilities of rings can be utilized to facilitate the automatic deployment of folded ring assemblies under small perturbations. Furthermore, an assembly with rigid functional panels is explored to demonstrate the functionality and design space for hexagonal ring assemblies. With such significant demonstrated area and volume changes upon snap-folding, it is anticipated that hexagonal ring assemblies could inspire future aerospace or biomedical designs, where reconfiguration and large packing are required.
Robust Dynamic Balancing of Dual Rotor-Active Magnetic Bearing System Through Virtual Trial Unbalances as Low and High Frequency Magnetic Excitation
Authors: Ranjan Gyan , Tiwari Rajiv , Nemade H. B. 
Published: June 2022

Abstract
This work focuses on in situ residual unbalance estimation of the dual rotor system with the implementation of active magnetic bearing (AMB) as a controller and exciter. The excessive vibration generated due to the presence of residual unbalances limits the operating speed of the system. The compact structure of the dual rotor system provides constraints to the conventional balancing procedure that requires manual addition of the trial unbalances for balancing. In order to overcome the difficulty in balancing of the dual rotor system, an identification algorithm based on the modified influence coefficient method (MICM) is developed for the simultaneous estimation of residual unbalances in both inner and outer rotors with the generation of virtual trial unbalances as magnetic excitation through AMB. The controlling action of AMB attenuates the vibrational response of the system within the required limit and allows the safe operation of the system in the presence of rotor faults and additional excitations. The vibrational responses of the system at the limited locations and the magnitude and phase of the virtual trial unbalances are only required in the MICM for the estimation of unbalances. To numerically illustrate the present methodology, the displacement response is obtained from the developed finite element model of the dual rotor system with discrete disk unbalances and randomly distributed shaft. The robustness of the algorithm in the estimation of residual unbalances is verified with the addition of a different percentage of measurement noises. After balancing, the dual rotor system is found to traverse its critical speed with a less vibrational response.
Experimental and Mechanistic Characterizations of Oil-Based Cement Slurry Flow Behavior Through Fractures in a Carbonate Reservoir
Authors: Wang Haiwen , Zhao Zulong , Gao Zhanwu , Ding Yanan , Yang Daoyong 
Published: June 2022

Abstract
In this paper, techniques have been developed to experimentally and mechanistically describe the oil-based cement slurry (OBCS) flow through fractures in carbonate reservoirs when it is co-injected with a pad fluid. Experimentally, a three-dimensional (3D) physical model is used to simulate flow behavior within fractures in carbonate rocks by using the ultra-fine cement and class G cement with or without pad fluids. The injection pressures of an OBCS flow are measured and recorded as a function of time during the experiments at a constant flowrate, while effects of fracture width (i.e., 0.5 mm and 1.0 mm) and cement type (i.e., the class G cement and the ultra-fine cement) on injection pressure are examined and analyzed. Theoretically, the Navier–Stokes (NS) equations are modified and integrated to obtain the explicit velocity equations of visco-plastic materials in a planar fracture, and to further quantify the injection pressure of the slurry flow as a function of viscosity, flowing distance of the injected slurry, fracture width, and flowrate. It is found from the experimental measurements that the fracture width imposes a much larger impact on injection pressure along the fracture than other parameters. Once slurry is made in contact with water, its injection pressure not only increases rapidly with one or two orders of magnitude or even larger but also is changed from its linear to exponential relationship with time after a certain time. During the linear stage, the injection pressure of ultra-fine cement is smaller than that of the class G cement, while an opposite pattern is yielded during the exponential stage, i.e., the exponent of the injection pressure formula pertaining to the ultra-fine cement is found to be about 1.5 times larger than that of the class G cement. By incorporating the experimentally measured patterns of the slurry distribution within the fracture model, the newly developed mechanistic model has been validated by reproducing the experimental pressure measurements, allowing us to perform reliable characterization of the OBCS flow behavior in a fracture and then to efficiently and accurately predict and optimize its water-plugging performance.
High Efficiency Energy Harvesting Using a Savonius Turbine With Multicurve and Auxiliary Blade
Authors: Dinh Le Anh , Minh Banh Duc , Trinh Chu Duc 
Published: June 2022

Abstract
A new blade configuration is proposed to further increase the performance of a Savonius rotor through a sequence of unsteady two-dimensional (2D) computational fluid dynamics (CFD) simulations. The blade is made by a multicurve and auxiliary profiles for a reduction of the negative drag on the rotor. The flow aspects around the new blade are analyzed and quantitatively compared with that of the conventional and other blade configurations. The results imply a dependency of the rotor performance on the blade shape, demonstrating an appropriate configuration that produces the highest coefficient of torque and power. The newly optimized configuration is recognized with the peak of power coefficient at a tip speed ratio (TSR) of 1.5, which is more than two times higher than the conventional one. This makes the Savonius rotor better applicable to the urban environment. Importantly, this blade significantly increases the power coefficient by 6.3% at TSR &lt; 1.0, known as a typical working condition in rural areas. The present results thus point out a feasible solution for powering the poor-households with no access to the grid and reducing the harmfulness to the environment, with high efficiency in wide operating conditions over the previous designs.
Suppression of Cavitation Instabilities in an Inducer by the Circumferential Groove With Swirl Breakers
Authors: Horiguchi Hironori , Tsubouchi Kota , Toyoshima Masakazu , Sugiyama Kazuyasu 
Published: June 2022

Abstract
A circumferential groove with swirl breakers was designed and its effect on the suppression of cavitation instabilities in an inducer was investigated in experiments. The circumferential groove with the swirl breakers could suppress almost all cavitation instability phenomena effectively and improve suction performance. Observations of flow fields in CFD showed that the swirl breakers reduced the circumferential velocity of the flow near the blade tip at the inlet of the inducer. It was suggested that such a flow pattern succeeded in suppressing cavitation instability phenomena, including pressure fluctuations with high frequencies caused by the interaction of the blades with backflow vortices which were visible as backflow vortex cavities in low suction pressure.
Present-Day Practice of Non-Target Chemical Analysis
Authors: Milman B. L. , Zhurkovich I. K. 
Published: June 2022

Abstract
We review the main techniques, procedures, and information products used in non-target analysis (NTA) to reveal the composition of substances. Sampling and sample preparation methods are preferable that ensure the extraction of analytes from test samples in a wide range of analyte properties with the most negligible loss. The necessary techniques of analysis are versions of chromatography–high-resolution tandem mass spectrometry (HRMS), yielding individual characteristics of analytes (mass spectra, retention properties) to accurately identify them. The prioritization of the analytical strategy discards unnecessary measurements and thereby increases the performance of the NTA. Chemical databases, collections of reference mass spectra and retention characteristics, algorithms, and software for processing HRMS data are indispensable in NTA.
Surgical excision of bilateral patella stress fractures in an elite marathon runner
Authors: Thompson Joshua W , Radakrishnan Ganan T , Kayani Babar , Haddad Fares 
Published: June 2022

Vertical stress fractures of the patella are rare, with only a handful of bilateral cases reported. Stress fractures in the athletic community are often due to repetitive strain and submaximal loading, with minimal recovery time. An Olympic marathon runner in her 30s presented with right anterolateral knee pain. MRI revealed an acutely displaced vertical fracture of the lateral patella. After failure of non-operative treatment, she underwent surgical excision of the fracture fragment and lateral patellofemoral retinacular repair. Despite return to light training pain-free 3 weeks after surgery, she presented 2 months later with a contralateral vertical patella stress fracture. On this occasion, early operative treatment was performed with early return to training and resolution of symptoms.This is the first reported case of bilateral vertical patellar stress fractures in an athlete treated with excision of the fracture fragment. This is an excellent option for elite athletes who require a quick postoperative recovery, complete resolution of symptoms and early return to preinjury level of sport.
The case for investing in the prevention and control of non-communicable diseases in the six countries of the Gulf Cooperation Council: an economic evaluation
Authors: Elmusharaf Khalifa , Grafton Daniel , Jung Johanna S , Roberts Emily , Al-Farsi Yahya , Al Nooh Ameera Ali , Bin Belaila Buthaina , ElShamy Amin , Al-Zuabi Hamoud , Al Mutawa Kholood Ateeq , Alraisi Shadha , Al Lawat Najla , Gharbal Ali , Alomary Shaker , Kulikov Alexey , Pourghazian Nasim , Slama Slim , Tarlton Dudley , Banatvala Nicholas 
Published: June 2022

BackgroundWhile the non-communicable disease (NCD) burden in the countries of the Gulf Cooperation Council (GCC) (Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates) has surged over the past decades, the costs and return on investment (ROI) of implementing cost-effective, WHO-recommended NCD interventions have not been established.MethodsWe performed an economic analysis to estimate the ROI from scaling up four sets of NCD interventions over 15 years. We estimated the direct costs of the four main NCDs (cancer, diabetes, cardiovascular diseases and chronic respiratory diseases) using a prevalence-based, bottom-up cost-of-illness approach. We estimated indirect costs based on productivity loss due to absenteeism, presenteeism and premature deaths. We costed the scaling up of interventions using the WHO Costing Tool and assessed the health impact of interventions using the OneHealth Tool. We calculated ROI by comparing productivity and social benefits with the total costs of implementing the interventions.ResultsThe four main NCDs cost the GCC economy nearly US$50 billion in 2019, equal to 3.3% of its gross domestic product. The indirect costs are estimated at US$20 billion or 40% of the total burden. Implementing the four modelled intervention packages in the six GCC countries over 15 years will cost US$14 billion, with an ROI of US$4.9 for every US$1 invested and significant health and social benefits, including 290 000 averted premature deaths.ConclusionBased on the results of these six investment cases, we recommend actions to scale up current WHO-recommended cost-effective interventions, strengthen whole-of-government action, drive the NCD legislative agenda, build out the evidence base, generate additional advocacy material, and increase regional collaboration and data-sharing to establish best practices and monitor impact.
Use of behavioural activation to manage pain: a systematic scoping review
Authors: Walsh Sandra , Moseley G Lorimer , Gray Richard John , Gillam Marianne , Gunn Kate M. , Barker Trevor , Tran Kham , Eshetie Tesfahun , Jones Martin 
Published: June 2022

BackgroundBehavioural activation (BA) is an effective treatment for depression; however, it is unclear if it can be used to manage pain.ObjectivesTo conduct a scoping review of primary research that reported using BA to support people living with chronic pain to understand how BA had been used in relation to pain. In addition, we wanted to understand whether there were any reported changes in that pain, and how and who delivered BA.Eligibility criteriaPrimary research published in English.Sources of evidenceWe searched seven databases MEDLINE, Ovid Embase, Ovid Emcare, PsycINFO, CINAHL, Scopus and Web of Science, for primary research. No initial date limit was used with the date the searches were conducted used as the end date limit (1 July 2021).Charting methodsA customised data extraction table was developed, piloted and used.Results551 papers were screened for inclusion, with 15 papers included in our review. Studies were conducted in North America and in Canada. These included three case studies, nine uncontrolled trials and three randomised controlled trials. Only two studies reported pain as the primary outcome. BA was applied across a range of pain related conditions. The dose of BA ranged from 3 to 16 sessions. Duration of treatment was 3 weeks to 12 months. Most studies reported reductions in pain following exposure to BA.ConclusionBA has the potential to reduce pain. Caution needs to be exercised in the interpretation of these findings as a high risk of bias was observed in most studies. High-quality research is required to test if BA is an effective intervention for chronic pain.
Association of Chlamydia trachomatis infection with cervical atypia in adolescent women with short-term or long-term use of oral contraceptives: a longitudinal study in HPV vaccinated women
Authors: Adhikari Indira , Eriksson Tiina , Harjula Katja , Hokkanen Mari , Apter Dan , Nieminen Pekka , Luostarinen Tapio , Lehtinen Matti 
Published: June 2022

ObjectiveWe assessed the relationship between Chlamydia trachomatis infection, duration of oral contraceptive (OC) use and cervical atypia among young adult Finnish women.DesignA longitudinal study.Setting and participantsWomen who were included in this study participated in a community-randomised trial on the effectiveness of human papillomavirus (HPV) vaccination and C. trachomatis screening at ages 18.5 and 22 years in Finland. They completed questionnaires on both visits about sexual behaviours. The cytology test results at age 18.5 and 22 years were also available for those women. The total number of participants in this study at 18.5 years of age were 11 701 and at 22 years of age were 6618.Main outcome measureORs with 95% CIs using univariable and multivariable logistic regression were used to assess the association between C. trachomatis infection, duration of OC and squamous intraepithelial lesions (SIL).ResultsThere were 940 cytological SIL cases at the first screening visit and 129 cytological SIL cases at the second screening visit. Among the 22 years old, more than fourfold adjusted risk of SIL was associated with C. trachomatis positivity. The HPV16/18, condom use, smoking and number of sexual partners adjusted joint effect of prolonged OC use and C. trachomatis was significantly increased (OR 4.7, 95% CI 1.7 to 12.8) in the 22-year-old women. This observed joint effect was 1.6 times higher than expected on a multiplicative scale. On additive scale, the observed relative excess risk from interaction was 1.8.ConclusionThe risk of SIL in HPV vaccinated women is significantly increased if they are C. trachomatis positive and have used OC for 5 or more years. The biological basis may be lack of condom facilitated protection against sexually transmitted diseases.Trial registration numberNCT00534638.
Socioeconomic risk factors of hypertension and blood pressure among persons aged 15–49 in Nepal: a cross-sectional study
Authors: Joshi Sushant , Thapa Bishnu Bahadur 
Published: June 2022

ObjectivesThis study estimated the prevalence of hypertension, in accordance with the American College of Cardiology and American Heart Association’s 2017 guidelines, and examined the association between various socioeconomic factors and systolic blood pressure (SBP), diastolic blood pressure (DBP) and hypertension.Setting and designWe used nationally representative data from the 2016 Nepal Demographic and Health Survey. Multivariate analysis was used to study the association of hypertension with socioeconomic factors: logistic regression was used for hypertension and linear regression was used for DBP and SBP.ParticipantsOur sample consisted of 9827 adults between the ages of 15 and 49 years.ResultsThe prevalence of hypertension was 36%. The mean DBP and SBP were 76.4 and 111.5, respectively. Janjatis (adjusted OR (AOR): 1.34, CI: 1.12 to 1.59), Other Terai castes (AOR: 1.38, CI: 1.03 to 1.84), Muslim and other ethnicities (AOR: 1.64, CI: 1.15 to 2.33) and Dalits (AOR: 1.26, CI: 1.00 to 1.58) had higher odds of hypertension. Individuals employed in professional, technical and managerial professions collectively (AOR: 1.62; CI: 1.18 to 2.21) also had higher odds of hypertension. Moderately food insecure household had lower odds of hypertension (AOR: 0.84; CI: 0.72 to 0.99) compared with households with no issue of food insecurity. Results were similar for SBP and DBP. When stratified by sex, there were differences mainly in terms of occupation and ethnicity.ConclusionThere are substantial disparities in hypertension prevalence in Nepal. These disparities extend across ethnic groups, occupational status and food security status. Differences also persist across different provinces. As hypertension continues to be increasingly more significant, more research is needed to better understand the disparities and gradients that exist across various socioeconomic factors.
Serum neurofilament as a predictor of 10-year grey matter atrophy and clinical disability in multiple sclerosis: a longitudinal study
Authors: Lie Ingrid Anne , Kaçar Sezgi , Wesnes Kristin , Brouwer Iman , Kvistad Silje S , Wergeland Stig , Holmøy Trygve , Midgard Rune , Bru Alla , Edland Astrid , Eikeland Randi , Gosal Sonia , Harbo Hanne F , Kleveland Grethe , Sørenes Yvonne S , Øksendal Nina , Varhaug Kristin N , Vedeler Christian A , Barkhof Frederik , Teunissen Charlotte E , Bø Lars , Torkildsen Øivind , Myhr Kjell-Morten , Vrenken Hugo 
Published: June 2022

BackgroundThe predictive value of serum neurofilament light chain (sNfL) on long-term prognosis in multiple sclerosis (MS) is still unclear.ObjectiveInvestigate the relation between sNfL levels over a 2-year period in patients with relapsing-remitting MS, and clinical disability and grey matter (GM) atrophy after 10 years.Methods85 patients, originally enrolled in a multicentre, randomised trial of ω−3 fatty acids, participated in a 10-year follow-up visit. sNfL levels were measured by Simoa quarterly until month 12, and then at month 24. The appearance of new gadolinium-enhancing (Gd+) lesions was assessed monthly between baseline and month 9, and then at months 12 and 24. At the 10-year follow-up visit, brain atrophy measures were obtained using FreeSurfer.ResultsHigher mean sNfL levels during early periods of active inflammation (Gd+ lesions present or recently present) predicted lower total (β=−0.399, p=0.040) and deep (β=−0.556, p=0.010) GM volume, lower mean cortical thickness (β=−0.581, p=0.010) and higher T2 lesion count (β=0.498, p=0.018). Of the clinical outcomes, higher inflammatory sNfL levels were associated with higher disability measured by the dominant hand Nine-Hole Peg Test (β=0.593, p=0.004). Mean sNfL levels during periods of remission (no Gd+ lesions present or recently present) did not predict GM atrophy or disability progression.ConclusionHigher sNfL levels during periods of active inflammation predicted more GM atrophy and specific aspects of clinical disability 10 years later. The findings suggest that subsequent long-term GM atrophy is mainly due to neuroaxonal degradation within new lesions.