bluuebunny/crossref_metadata_2025 huggingface dataset:
Serum asprosin levels are increased and associated with insulin resistance in patients with polycystic ovary syndrome: A retrospective case-control study
Authors: Zhu Ling , Wang Lidan
Published: April 2023

Dysregulation of adipokines may play a role in the development of polycystic ovary syndrome (PCOS). This was a retrospective case-control study to investigate the relationship between asprosin and insulin resistance in patients with PCOS patients. The study enrolled 213 PCOS patients and 213 age-matched and body mass index-matched controls. The serum asprosin levels and the relationship between asprosin and PCOS with IR were compared between the 2 groups. In the current study, it was found that the serum asprosin level and hemostasis of model assessment-insulin resistance of PCOS were significantly higher than those of the control group, and asprosin was independently correlated with hemostasis of model assessment-insulin resistance and CRP (P < .05). Asprosin was found to be statistically significant in the analysis of receiver operating characteristics, and the specific result was 0.826 (0.724–0.879). This study emphasizes that increased levels of asprosin are independently associated with PCOS, and asprosin may be a new indicator for evaluating insulin resistance in PCOS patients.
A review on the oncogenesis of Merkel cell carcinoma: Several subsets arise from different stages of differentiation of stem cell
Authors: Zhu Yueyang , Yin Yuan , Li Fuqiang , Ren Zhiyuan , Dong Yaru
Published: April 2023

Merkel cell carcinoma (MCC), a rare primary cutaneous neuroendocrine neoplasm, is extremely aggressive and has a higher mortality rate than melanoma. Based on Merkel cell polyomavirus (MCPyV) status and morphology, MCCs are often divided into several distinct subsets: pure MCPyV-positive, pure MCPyV-negative, and combined MCC. MCPyV-positive MCC develops by the clonal integration of viral DNA, whereas MCPyV-negative MCC is induced by frequent ultraviolet (UV)-mediated mutations, that are characterized by a high mutational burden, UV signature mutations, and many mutations in TP53 and retinoblastoma suppressor gene (RB1). Combined MCC consists of an intimate mix of MCC and other cutaneous tumor populations, and is usually MCPyV-negative, with rare exceptions. Based on the existing subsets of MCC, it is speculated that there are at least 4 stages in the natural history of stem cell differentiation: primitive pluripotent stem cells, divergent differentiated stem cells, unidirectional stem cells, and Merkel cells (or epidermal/adnexal cells). In the first stage, MCPyV may integrate into the genome of primitive pluripotent stem cells, driving oncogenesis in pure MCPyV-positive MCC. If MCPyV integration does not occur, the stem cells enter the second stage and acquire the ability to undergo multidirectional neuroendocrine and epidermal (or adnexal) differentiation. At this stage, accumulated UV-mediated mutations may drive the development of combined MCC. In the third stage, the stem cells differentiate into unidirectional neuroendocrine stem cells, UV-mediated mutations can induce carcinogenesis in pure MCPyV-negative MCC. Therefore, it has been speculated that several subsets of MCCs arise from different stages of differentiation of common stem cells.
Efficacy of acupuncture therapy for stable chronic obstructive pulmonary disease: A systematic review and meta-analysis
Authors: Fan Su , Zhang Zhenyu , Wang Qinglin
Published: April 2023

Background:

Acupuncture therapy (AT) is a widely used, alternative medicine in China. AT is an effective treatment for many diseases, but its efficacy in stable chronic obstructive pulmonary disease (COPD) remains controversial. Therefore, we performed the present meta-analysis to evaluate the efficacy of AT in stable COPD patients.

Methods:

Randomized controlled trials (RCTs) for AT efficacy in stable COPD patients were searched in literature databases from the inception to December 31, 2021. Pooled effect sizes of outcome measurements with respect to lung function (forced vital capacity [FVC], forced expiratory volume in 1 second [FEV1], FEV1 in predicted value [FEV1%], FEV1/FVC), quality of life (St. George respiratory questionnaire [SGRQ]), exercise capacity (6-minute walking distance [6MWD]) and effective rate were estimated by calculating weighted mean difference (WMD) or odds ratio (OR) with corresponding 95% confidence interval (95% CI), respectively, by a random-effect model.

Results:

A total of 28 RCTs with 2130 COPD patients were included. AT group had significant improvement in FVC (WMD = 0.29 L, 95% CI: 0.22–0.36, P < .001), FEV1 (WMD = 0.33 L, 95% CI: 0.23–0.43, P < .001), FEV1% (WMD = 3.30%, 95% CI: 3.30–4.64, P < .001), FEV1/FVC (WMD = 5.45%, 95% CI: 4.41–6.49, P < .001), 6MWD (WMD = 45.48 m, 95% CI: 28.21–62.16, P < .001), SGRQ (WMD = −7.79, 95% CI: −12.34 to −3.24, P < .001), and a higher effective rate (OR = 3.71, 95% CI: 2.50–5.52, P < .001) compared to the control group. Subgroup analysis stratified by comparison model (AT combined with other treatments vs other treatments, AT alone vs sham AT) and treatment duration (≥8 weeks, <8 weeks) also showed more improvement in AT arm than control arm without significant between-subgroup difference. Adverse events were reported in a few studies and only mild reactions were observed.

Conclusion:

AT is effective in improving lung function, quality of life and exercise capacity, and can be used as an adjunctive treatment in patients with stable COPD.
A large pericardial cyst mimicking a unilateral pleural effusion: A case report
Authors: Li Minfang , Yang Chunfeng , Li Jinshuai , Jia Dan , Wang Yaqiong , Xie Wei , Wang Jinlin
Published: April 2023

Rationale:

Pericardial cysts are a rare benign disorder with a variable clinical presentation depending on their size and location. The diagnosis of pericardial cysts is usually based on imaging examinations. The definitive treatment is surgical resection.

Patient concern:

A 36-year-old woman presented with progressive left-sided chest pain and exertional dyspnea, with symptoms resembling pleural effusion.

Diagnoses:

The patient was diagnosed with a pericardial cyst based on imaging and video-assisted thoracoscopic surgery (VATS).

Intervention:

VATS was performed.

Outcomes:

The patient’s symptoms improved after successful removal of the pericardial cyst. Follow-up chest computed tomography exhibited no evidence of recurrence.

Lessons:

Clinicians should include pericardial cysts in the differential diagnosis of pseudopleural effusion. VATS is a feasible and safe method to treat symptomatic and large pericardial cysts.
Middle ear cholesteatoma resection under general anesthesia in patients with congenital methemoglobinemia: A case report
Authors: Cai Zenghua , Shao Yu , Wu Yu
Published: April 2023

Rationale:

Congenital methemoglobinemia is a rare cyanosis cause that can be manifested in affected individuals. We report a case of congenital methemoglobinemia after middle ear cholesteatoma resection under general anesthesia.

Patient concerns:

The primary concern of the patient is to safely perform cholesteatoma resection of the middle ear to reduce the pain associated with years of surgery and to survive the perioperative period.

Diagnoses:

Congenital methemoglobinemia type 1.

Interventions:

The patient underwent general anesthesia and cholesteatoma resection of the middle ear.

Outcomes:

The patient successfully underwent cholesteatoma resection in the middle ear under general anesthesia and went through the perioperative period smoothly, and successfully returned to society.

Lessons:

For patients requiring general anesthesia complicated with rare methemoglobinemia, we improve the awareness of crisis and make comprehensive preparation and monitoring, learn the pathophysiological mechanism related to the disease, so as to protect the operation of methemoglobin patients under general anesthesia.
Surgical approaches to the adrenal gland
Authors: Sada Alaa , McKenzie Travis J.
Published: April 2023

Purpose of review

Review the literature on the surgical management of adrenal diseases, highlighting the various surgical approaches and their respective pros and cons.

Recent findings

Minimally invasive adrenalectomy is commonly used for small and benign adrenal tumors, whereas open adrenalectomy is preferred for larger tumors and primary adrenal malignancy. Although minimally invasive adrenalectomy results in shorter recovery and fewer complications compared with open, the latter offers better oncologic outcomes in the setting of primary adrenal malignancy. Adrenalectomy is performed transabdominally or retroperitoneoscopically, both yielding equivalent results and recovery. Traditional laparoscopic or robotic equipment can be utilized for either minimally invasive approach. Subtotal adrenalectomy may be appropriate for patients with genetically associated pheochromocytoma to preserve cortical function and reduce the risk of adrenal insufficiency. However, the potential benefits of sparing adrenal function must be weighed against the risk of recurrence.

Adrenalectomy is becoming increasingly common worldwide. For benign and small adrenal tumors, minimally invasive adrenalectomy is generally considered the standard approach, while open adrenalectomy is preferred for primary adrenal malignancy and larger tumors. Subtotal adrenalectomy may be appropriate for patients with bilateral adrenal pheochromocytoma, as it can reduce the need for lifelong glucocorticoid dependency.
Use of Induction of Labour and Emergency Cesarean Section and Perinatal Outcomes in English Maternity Services: A National Hospital-Level Study
Authors: Gurol-Urganci Ipek , Jardine Jennifer , Carroll Fran , Frémeaux Alissa , Muller Patrick , Relph Sophie , Waite Lara , Webster Kirstin , Oddie Sam , Hawdon Jane , Harris Tina , Khalil Asma , van der Meulen Jan ,   National Ministry and Perinatal Audit Project Team
Published: April 2023

Care provided by maternity services requires a fine balance between support for the physiological process of birth and clinical intervention when needed. Yet, clinical guidelines for maternity care vary widely within and between countries. For singleton babies born at term in 149 hospitals of the National Health Service (NHS) in the United Kingdom alone, the rate of induction of labor varied from 16% to 44%, and the overall rate of cesarean delivery (CD) varied from 17% to 35% between April 2016 and March 2017. This suggests a lack of consensus around the indications for interventions, such as induction of labor and emergency CD. The debate often focuses on either the safety of childbirth or the women's experience to deliver good maternity care. The aim of this study was to examine the association between the rates of induction of labor and emergency CD with the risks of stillbirth, neonatal intensive care unit (NICU) admission, and need for mechanical ventilation in neonates born at term.

This was a national study using data collected from electronic maternity records between 2015 and 2017. Included were singleton pregnancies delivered in NHS hospitals providing maternity care. The primary outcomes were stillbirth, NICU admission, and mechanical ventilation.

The entire cohort included 1,131,719 term, singleton births in 131 hospitals. The risks of stillbirth, NICU admission, and need for mechanical ventilation in the baby were 0.15%, 5.4%, and 0.54%, respectively. Between hospitals, the rate of induction of labor ranged from 17.5% to 40.7% (interquartile range, 24.6%–32.1%), and the rate of emergency CD ranged from 5.6% to 17.1% (interquartile range, 9.4%–11.8%). In hospitals with higher induction rates, the risk of adverse perinatal outcomes was lower, but the association was statistically significant only between the rate of induction and rates of stillbirth (P = 0.002) and mechanical ventilation (P = 0.001). For each 5%-point increase in the rate of induction at a hospital, there was a 9% decrease in the risk of stillbirth (odds ratio [OR], 0.91; 95% confidence interval [CI], 3%–15%) and a 14% decrease in the risk of mechanical ventilation (OR, 0.86; 95% CI, 6%–21%). There was no association between the rate of emergency CD and the primary outcomes (all P > 0.05).

In the United Kingdom, the rates of induction of labor and emergency CD varied considerably between hospitals. Those hospitals with higher rates of induction had lower risks of adverse perinatal outcomes, but not for emergency CD.
Artificial Intelligence and Interstitial Lung Disease: Diagnosis and Prognosis
Authors: Dack Ethan , Christe Andreas , Fontanellaz Matthias , Brigato Lorenzo , Heverhagen Johannes T. , Peters Alan A. , Huber Adrian T. , Hoppe Hanno , Mougiakakou Stavroula , Ebner Lukas
Published: April 2023

Interstitial lung disease (ILD) is now diagnosed by an ILD-board consisting of radiologists, pulmonologists, and pathologists. They discuss the combination of computed tomography (CT) images, pulmonary function tests, demographic information, and histology and then agree on one of the 200 ILD diagnoses. Recent approaches employ computer-aided diagnostic tools to improve detection of disease, monitoring, and accurate prognostication. Methods based on artificial intelligence (AI) may be used in computational medicine, especially in image-based specialties such as radiology. This review summarises and highlights the strengths and weaknesses of the latest and most significant published methods that could lead to a holistic system for ILD diagnosis. We explore current AI methods and the data use to predict the prognosis and progression of ILDs. It is then essential to highlight the data that holds the most information related to risk factors for progression, e.g., CT scans and pulmonary function tests. This review aims to identify potential gaps, highlight areas that require further research, and identify the methods that could be combined to yield more promising results in future studies.
Correction of a Visible Silastic Implant Using the Dual-layered Capsular Flaps
Authors: Lee Sae Bin , Min Hyun Jin
Published: April 2023

Alloplastic implants used for dorsal augmentations can induce surgical and cosmetic complications. One of these cosmetic complications is when the implant is visible through the skin. In these cases, it is recommended to use an autologous soft tissue to reinforce the area between the skin and the implant. Recently, a patient visited our institute complaining of a previously inserted silastic implant being visible through the skin. Based on the implant, we hypothesized that the surrounding soft tissue might have formed 2 capsular layers, and the implant might have separated from the capsular. During the revision rhinoplasty, we peeled off the 2 capsular layers and used them to reinforce the area between the implant and skin without harvesting autologous tissue. This procedure had a satisfactory surgical outcome and a shorter operative time than harvesting autologous tissue. Here, we describe our experience and share lessons from this case.
Marginal Mandibulectomy and Oral Rehabilitation of Xeroderma Pigmentosum Patient
Authors: da Silva Isadora França Vieira , de Toledo Guilherme Lacerda , Jardilino Francisca Daniele Moreira , Bhering Cláudia Lopes Brilhante , Moreno Amália
Published: April 2023

Xeroderma pigmentosum (XP) may cause tissue deformation in patients who have undergone oral cancer surgery requiring resection of any part of the mandible. Oral rehabilitation is a pivotal factor in the restoration of function and esthetics. The aim of this study was to report a clinical case of successful prosthetic rehabilitation of a 57-year-old woman who presented with marginal mandibulectomy and a significant reduction in maximal mouth opening after treatment for XP. With her reduced opening and considerable loss of structure and tissue, she had difficulty speaking, swallowing, and altered esthetics. The oral rehabilitation was performed with complete maxilla denture and mandible overdenture retained by 2 implants. This case demonstrates that the rehabilitation with mandible overdentures and complete maxilla dentures provide function and esthetic improvement in the mutilated area for XP patients with marginal mandibulectomies.
Application of Preexpanded Free Flaps Based on Thoracic Branch of Supraclavicular Artery for Facial Scar Treatment
Authors: Pei Jiaomiao , Zhang Juan , Liu Chaohua , Li Yang , Song Baoqiang
Published: April 2023

Background:

As an exposure region, the face is susceptible to burn injuries, which often lead to physical and psychological problems. For facial scar reconstruction, the subclavicular region has the advantages of matched color, similar texture, and thin and pliable tissue supply. The island or pedicled subclavicular flap, which is nourished by the thoracic branch of supraclavicular artery (TBSA) had been reported to cover cervical facial defects and achieved good outcomes. However, the main restriction is the limitation of the pedicle length. Therefore, the authors applied preexpanded TBSA free flap transplantation for treatments of upper and contralateral facial scars to overcome the pedicle limitation.

Methods:

Three patients were treated with preexpanded TBSA flaps to repair the facial defects after scar resections. Two of them were combined with forearm or deltopectoral flaps according to different purposes. The patients were followed up for 2 to 7 years. The clinical data and surgical techniques were recorded and analyzed. The scars were scored by Vancouver Scar Scale.

Results:

Two of the TBSA flaps survived well without complication. Partial flap necrosis in the distal end was healed by dressing changes, and mild contracture in the left medial canthus was corrected by Z plasty in case 1. The scars around transferred flaps and donor sites were scored 3 to 4 by Vancouver Scar Scale. The patients were satisfied with the outcomes. All the donor sites were closed primarily.

Conclusion:

A preexpanded TBSA-free flap could overcome the restriction of pedicle length for reconstruction procedures. The method is a feasible alternative of thoracic flaps to repair facial defects beyond pedicle limitation.
Long-term Mortality and Reintervention After Repair of Ruptured Abdominal Aortic Aneurysms Using VQI-matched Medicare Claims
Authors: Cirillo-Penn Nolan C. , Zheng Xinyan , Mao Jialin , Johnston Lily E. , D’Oria Mario , Scali Salvatore , Goodney Philip P. , DeMartino Randall R. ,   on behalf of VQI and VISION
Published: April 2023

Objective:

The objective of this study was to compare endovascular aortic aneurysm repair (EVAR) versus open aortic repair (OAR) on mortality and reintervention after ruptured infrarenal abdominal aortic aneurysm (rAAA) repair in the Vascular Quality Initiative (VQI).

Background:

The optimal treatment modality for rAAA remains debated, with little data on long-term comparisons.

Methods:

VQI rAAA repairs (2004–2018) were matched with Medicare claims (VQI-VISION). Primary outcomes were in-hospital and long-term mortality. Secondary outcome was reintervention. Inverse probability weighting was used to adjust for treatment selection, and Cox Proportional Hazards models and negative binomial regressions were used for analysis. Landmark analysis was performed among patients surviving hospital discharge.

Results:

Among 1885 VQI/Medicare rAAA patients, 790 underwent OAR, and 1095 underwent EVAR. Median age was 76 years; 73% were male. Inverse probability weighting produced comparable groups. In-hospital mortality was lower after EVAR versus OAR (21% vs 37%, odds ratio: 0.52, 95% CI, 0.4–0.7). One-year mortality rates were lower for EVAR versus OAR [hazard ratio (HR) 0.74, 95% CI, 0.6–0.9], but not statistically different after 1 year (HR: 0.95, 95% CI, 0.8–1.2). This implies additional benefits to EVAR in the short term. Reintervention rates were higher after EVAR than OAR at 2 and 5 years (rate ratio: 1.79 95% CI, 1.2–2.7 and rate ratio:2.03 95% CI, 1.4–3.0), but not within the first year. Reintervention was associated with higher mortality risk for both OAR (HR: 1.66 95% CI, 1.1–2.5) and EVAR (HR: 2.14 95% CI, 1.6–2.9). Long-term mortality was similar between repair types (HR: 0.99, 95% CI, 0.8–1.2).

Conclusions:

Within VQI/Medicare patients undergoing rAAA repair, the perioperative mortality rate favors EVAR but equalizes after 1 year. Reinterventions were more common after EVAR and were associated with higher mortality regardless of treatment.
Five-year Comorbidity Outcomes in Laparoscopic Vertical Sleeve Gastrectomy (LVSG) and Laparoscopic Roux-en-Y Gastric Bypass (LRYGB): A Systematic Review and Meta-analysis of Randomized Controlled Trials
Authors: Osland Emma J. , Yunus Rossita M. , Khan Shahjahan , Memon Muhammed Ashraf
Published: April 2023

Background:

Laparoscopic vertical sleeve gastrectomy (LVSG) is now the most commonly performed bariatric procedure; however, it remains to be elucidated if it delivers equivalent long-term comorbid disease resolution outcomes similar to the longer established laparoscopic Roux-en-Y gastric bypass (LRYGB). We undertook a systematic review and meta-analysis of randomized controlled trials (RCTs) to investigate the comparative 5-year outcomes of both procedures.

Methods:

Electronic databases (Pubmed, EMBASE, CINAHL) were searched for RCTs conducted in adults (>18y) that compared the 5-year- outcomes of LVSG to LRYGB and described comorbidity outcomes were included. Where data allowed, effect sizes were calculated using the Hartung-Knapp-Sidik-Jonkman estimation method for random effects model. Presence of bias was assessed with Cochrane Risk of Bias 2.0 and funnel plots, and certainty of evidence evaluated by GRADE. The study prospectively registered with PROSPERO (CRD42018112054).

Results:

Three RCTs (LVSG=254, LRYGB=255) met inclusion criteria and reported on chronic disease outcomes. Improvement and/or resolution of hypertension favoured LRYGB (odds ratio 0.49, 95% CI 0.29, 0.84;P=0.03). Trends favoring LRYGB were seen for type 2 diabetes and dysplidemia, and LVSG for sleep apnea and back/joint conditions (P>0.05). The certainty of evidence associated with each assessed outcome ranged from low to very low, in the setting of ‘some’ to ‘high’ bias assessed as being present.

Conclusion:

Both LRYGB and LVSG are effective in providing long-term improvements in commonly experienced obesity-related comorbidities; however, the limited certainty of the evidence does not allow for strong clinical conclusions to be made at this time regarding benefit of one procedure over the other.
Efficacy of Laparoscopic Iliopubic Tract Repair Plus Transabdominal Preperitoneal Hernioplasty for Treating Inguinal Hernia After Robot-assisted Radical Prostatectomy
Authors: Lee Sung Ryul
Published: April 2023

Background:

Robot-assisted radical prostatectomy (RARP) is a risk factor for inguinal hernia (IH). Furthermore, in patients who have undergone RARP, the fibrotic scar tissue in the RARP area limits preperitoneal dissection. This study aimed to evaluate the efficacy of performing laparoscopic iliopubic tract repair (IPTR) in addition to transabdominal preperitoneal hernioplasty (TAPPH) to treat IH after RARP.

Patients and Methods:

A total of 80 patients with an IH after RARP were treated with TAPPH from January 2013 to October 2020 and were included in this retrospective study. Patients who underwent conventional TAPPH were categorized as the TAPPH group (25 patients with 29 hernias), whereas those who underwent TAPPH with IPTR were categorized as the TAPPH + IPTR group (55 patients with 63 hernias). The IPTR comprised suture fixation of the transversus abdominis aponeurotic arch to the iliopubic tract.

Results:

All patients had indirect IH. The incidence of intraoperative complications was significantly higher in the TAPPH group than in the TAPPH + IPTR group [13.8% (4/29) vs 0.0% (0/63), P = 0.011]. The average operative time was also significantly shorter in the TAPPH + IPTR group than in the TAPPH group (P < 0.001). There were no differences between the two groups in the duration of hospitalization, recurrence rate, and pain severity.

Conclusions:

The addition of laparoscopic IPTR to TAPPH for treating IH after RARP is safe and is associated with a minimal risk of intraoperative complications and a short operative time.
Identification and assessment of risks related to digitalization in Indian construction: a quantitative approach
Authors: Bajpai Avirag , Misra Subhas Chandra , Kim Dong-Young
Published: April 2023

Purpose

The purpose of this research article is to investigate the critical risk factors associated with the digitalization impact on the Indian construction industry, as these firm plans to implement digitalization in order to improve their construction management processes.

Design/methodology/approach

In this research article, risk factors and dimensions are taken from diverse industries and validated in the construction domain by industry and academic experts. Further, multi-criteria decision-making techniques are employed to assess the Indian construction sector scenario quantitatively. The interrelationship and weightage of risk factors and dimensions are determined by the Fuzzy Decision-making Trial and Evaluation Laboratory Analytic Network Process (DANP) method. However, the method Grey Technique for the Order of Prioritization by Similarity to Ideal Solution (TOPSIS) is used to determine the ranking of each risk factor.

Findings

This study finds 14 critical risk factors along with four risk dimensions. Operational and financial dimensions are significant risk dimensions. Whereas the threat of high outlay and low yield is a significant risk factor in construction. Besides that, the interrelationship among risk factors, the weightage of each factor and the ranking of critical risk factors are also identified.

Research limitations/implications

This research article uses Fuzzy DANP and Grey TOPSIS techniques as exploratory research methods with a limited group of construction professionals from a leading Indian construction firm. Furthermore, comprehensive confirmatory research can also be performed with a large group of construction experts using advanced analytical techniques to validate the ranking of critical risk factors.

Practical implications

The findings of this study provide insight into the knowledge of construction firms by emphasizing significant risk factors related to digitalization in construction operations. Another finding of this study shows that the risks associated with digitalization in construction are similar to those in manufacturing, where high outlay and low yield hold a significant role in the transformation process.

Originality/value

The research is unique since there have only been limited studies in the Indian construction scenario to analyze the significant risks associated with digitalization. Furthermore, this study demonstrates that the combination of Fuzzy DANP and Grey TOPSIS techniques may be used successfully to prioritize risks in construction digitalization, which is still in its early phases.
Improved methods for stator end winding leakage inductance calculation
Authors: Kostro Grzegorz , Michna Michal , Kutt Filip , Ryndzionek Roland
Published: April 2023

Purpose

Calculating the stator end-winding leakage inductance, taking into account the rotor, is difficult due to the irregular shape of the end-winding. The end-winding leakage may distribute at the end of the active part and the fringing flux of the air gap. The fringing flux belongs to the main flux but goes into the end-winding region. Then, not all the magnetic flux occurring in the end region is the end-winding leakage flux. The purpose of this paper was to find a method to accurately separate the leakage from the total flux, taking into account the rotor.

Design/methodology/approach

In this paper, two methods based on energy calculation are presented. Both methods require the assumption that the machine is symmetrical. The first method depends on the total leakage inductance and the machine’s active region length. The second method is based on the energy stored in the end region of the machine. In this case, removing the energy produced by the fringing flux of the air gap is necessary. The model should have a volume-closing fringing flux to remove the part of energy belonging to the end of the air gap.

Findings

The method presented in the paper does not require rotor removal. The values of the end-winding leakage inductance computed based on the proposed method were compared with values computed using the method with the removed rotor. The computations show that the proposed method is closest to the results from the method presented in the literature. Results obtained in the first method present that rotor influence on the value of end-winding leakage inductance exists. The model of the stator end-winding described in the paper is general. Therefore, the proposed methods are suitable for calculating the end-winding leakage inductance of other electric machines.

Originality/value

The method presented in the paper considers the rotor in end-winding leakage inductance calculation. It is not necessary to remove the rotor as in the similar method presented in the literature. The authors elaborated a parametric model with a volume-closing fringing flux to remove the part of energy belonging to the end of the air gap. The authors also elaborated their 3D model of the machine winding for calculations in Opera 3D.
Measuring long-run housing affordability for Malaysian millennial households: a geospatial and income distribution analysis
Authors: Rangel Gary John , Ng. Jason Wei Jian , Murugasu Thangarajah Thiyagarajan , Poon Wai Ching
Published: April 2023

Purpose

The purpose of this study is to use a lifetime income measure to evaluate the long-run housing affordability for an understudied cohort of households in the literature – the millennials. The authors do this in the context of Malaysia, measuring long-run affordability for four housing types across geographic locations and income distributions.

Design/methodology/approach

This study calculates a long-run housing affordability index (HAI) using data on house prices and household incomes. Essentially a ratio of predicted lifetime incomes to house prices, the HAI is computed for four common housing types in Malaysia from 2005 to 2016 and for six states in the country. The HAI is also compared across four income percentiles.

Findings

The analysis reveals varying patterns of housing affordability among different states in Malaysia. Housing affordability has declined since 2010, with most housing types being unaffordable for millennial-led households with the lowest income. Housing is most affordable for those in the highest income bracket, although even here, there are pockets of unaffordable housing as well.

Practical implications

Based on the findings, this study proposes three targeted interventions to improve housing affordability for Malaysian millennials.

Originality/value

This study fills a gap in the literature by examining the long-run housing affordability of Malaysian millennial-led households based on both geographic location and income distribution. The millennial population is understudied in the housing affordability literature, making this study a valuable contribution to the field.
On impersonal justice: libraries' neutrality as an act of change
Authors: Foderaro Antonella
Published: April 2023

Purpose

This study introduces Simone Weil's impersonal justice concept and its relevance to libraries' identity and role in societies. The article presents the constituents of impersonal justice and a theoretical justification for the coexistence of neutrality with libraries' commitment to social causes.

Design/methodology/approach

Conceptual analysis of 3 Weil's works, 13 scientific articles and 12 libraries' official documents was applied, looking at relevant concepts and findings, contexts of use, arguments and types of authority.

Findings

Five constituents of impersonal justice were found: universality, concreteness, unicity, inviolability and inappropriability. Impersonal justice, based on the inviolable value of each individual and the universal expectation of good, allows for a more accurate definition of social justice. Besides, it justifies libraries' commitment to climate change, migrants and Black lives matter, among other causes.

Originality/value

In contrast to previous works, this paper focuses on clarifying concepts by applying conceptual analysis to Weil's works, Library and Information Science (LIS) sources in scientific and normative contexts. Additionally, the analysis of arguments and types of authority for justifying claims pro and against neutrality allows the reconstruction of the argumentative discourse beyond the examined sources.
From seedlings to ships: supply chain and production management in the Venice Arsenale, 1400–1800
Authors: Wilson James M. , Favotto Alvise
Published: April 2023

Purpose

The Arsenale was the largest medieval industrial enterprise, famous for its assembly line. Management faced extreme variations between peace-time and war-time demands. Satisfying these unpredictable and sudden demands for a large, complex product with a multiple years–long production cycle was challenging. The purpose of this study is to analyze the Arsenale’s operations and supply chain arrangements, and to identify and assess their management policies. We also track its development and investigate its influence on other countries.

Design/methodology/approach

The research methodology used is archival research with content analysis of text and graphic representations of production processes.

Findings

These reveal that Venice’s supply chain management evolved from simply exploiting woodlands as needs arose, to a managed forest with planned planting, cultivation and harvesting, ending with the active modification of growing trees so their natural growth was artificially shaped to satisfy production requirements. Instead of fabricating components in their factory, the Venetians formed them by shaping the trees while they were still growing. These arboriculture techniques then provided a planned and regular supply of high-quality components that purely natural processes provided only randomly.

Research limitations/implications

There may be undiscovered archival documents despite the authors’ best efforts. The development of this historic supply chain reflects modern managerial concerns.

Practical implications

Modern restorations of historic ships and buildings use some of the fabrication methods identified, although the more intensive techniques would require higher volume production.

Social implications

This reveals historical forestry practices emphasised long-term needs and sustainable use.

Originality/value

To the best of the authors’ knowledge, this is a unique long-term investigation of an integrated production system and considers its influence on Iberian, French, British and American forestry and ship building. The close integration of production requirements with forestry practices was a novel finding.
Empowering middle managers to free their strategic capabilities
Authors: Letierce Clara , Mills Colleen , Arnaud Nicolas
Published: April 2023

Purpose

This article aims to better understand how empowered middle manager engage in change translation? Relying on the notions of building and dwelling strategizing, the authors analyze the micro-practices of middle managers during organizational change, when middle managers are freed from time-consuming administrative activities.

Design/methodology/approach

This empirical study relies on a qualitative embedded case study approach that involves comparing two banking units belonging to a large French bank. The qualitative data were collected from three different sources: exploratory and semi-structured interviews, observations and secondary data. The coding analysis enables to distinguish middle managers' dwelling and building strategizing during organizational change.

Findings

The study’s findings show how managers translate organizational change relying on both building and dwelling strategizing. By doing so, managers enable to adapt the prescribed strategy to local circumstances and foster front-line empowerment.

Research limitations/implications

Even though the findings are based on the analysis of a single organization, the authors provide several theoretical insights. First, the authors contribute to the recent academic debate in strategy-as-practice literature by showing the recursive relation between building and dwelling strategizing. The authors also shed a new light on middle managers' strategizing by emphasizing the idea that middle managers are not only passive change “translators” but that middle managers enact a real agency in the organizational change process.

Practical implications

From a managerial perspective, the study’s findings enable to enlight what empowering middle managers means in practice. Indeed, the authors show clear empirical illustrations of how middle managers can be empowered by both organizational structure and top-management support. The results also reveal how empowering middle managers enable to empower their team by three different activities: (1) federate the team spirit to facilitate collaboration; (2) develop employees' capabilities and (3) adjust managers' activity according to employees' needs.

Originality/value

While multiple current new ways of organizing encourage to transform organizations from inefficient bureaucracies into flatter and more dynamic project-based teams, calling into question the importance of middle managers' strategic role, this study provides an original case study of an organization that chose to run against the tide and created an additional middle management level.
Effectiveness of MOOCs on learning efficiency of students: a perception study
Authors: N. Abhishek , Kulal Abhinandan , M.S. Divyashree , Dinesh Sahana
Published: April 2023

Purpose

The study is aimed at analyzing the perceptions of students and teachers regarding the effectiveness of massive open online courses (MOOCs) on learning efficiency of students and also evaluating MOOCs as an ideal tool for designing a blended model for education.

Design/methodology/approach

The analysis was carried out by using the data gathered from the students as well as teachers of University of Mysore, Karnataka, India. Two separate sets of questionnaires were developed for both the categories of respondents. Also, the respondents were required to have prior experience in MOOCs. Further, the collected data was analyzed using statistical package for social sciences (SPSS).

Findings

The study showed that MOOCs have a more positive influence on learning efficiency, as opined by both teachers and students. Negative views such as cheating during the assessment, lack of individual attention to students and low teacher-student ratio were also observed.

Practical implications

Many educational institutions view that the MOOCs do not influence learning efficiency and also do not support in achieving their vision. However, this study provides evidence that MOOCs are positively influencing the learning efficiency and also can be employed in a blended model of education so as to promote collaborative learning.

Originality/value

Technology is playing a pivotal role in all fields of life and the education sector is not an exception. It can be rightly said that the technology-based education models such as MOOCs are the need of the hour. This study may help higher education institutions to adopt MOOCs as part of their blended model of education, and, if already adopted, the outcome of the present study will help them to improve the effectiveness of the MOOCs they are offering.
Role of nutrition in minimizing mental and health-related issues during COVID-19: a systematic literature review
Authors: Sharma Luxita , Sharma Dhananjay
Published: April 2023

Purpose

This study aims to conduct a systematic literature review to investigate the mental health problems during COVID-19 and the role of nutrition in minimizing mental and health-related issues during COVID-19.

Design/methodology/approach

A literature search was done electronically on April–May 2022 in the databases Google Scholar, PubMed and Cochrane Library, reviewing all the articles published in English. There were no limitations for the study (such as study design, region or any time frame). The quality assessment was done. The beginning database search picked out a total of 654 articles, 47 in PubMed, 575 in Google Scholar, 22 in Cochrane Library and 10 records from other sources. A total of 565 (duplicates found 89) were found after removing the duplicated articles, after reading the title and abstracts were further decreased to 88 full-text articles. These 88 studies went for full-text analysis, which excluded 56 studies and generated a final 32 articles for systemic analysis. The quality of the included study for the systematic review was assessed in two ways: one is evidence-based and another one on the JBI checklist.

Findings

People in social isolation and home quarantine suffer from severe anxiety, stress, depression, loneliness, anger and panic attack. During COVID-19, the vital role of diet and nutrients in mental health has been acknowledged and helps mitigate COVID-19 infection. Many studies showed stress and anxiety due to increased unhealthy eating and lifestyle practices.

Originality/value

This review will explain the interlink between diet and mental health because what we eat and think is interconnected with the gut–brain axis. The dietary elements and psychobiotic help in improving the immune system and psychological distress during the pandemic. This paper describes the role of different nutrients, psychobiotics and phytochemicals, to minimize mental and health issues during the COVID-19 pandemic. This paper also contains a balanced diet plan to withstand COVID-19.
An experimental look at reasonable suspicion and police discretion
Authors: McLean Kyle , Nix Justin , Stoughton Seth W. , Adams Ian T. , Alpert Geoffrey P.
Published: April 2023

Purpose

This study aims to demonstrate the need for further examination of legal judgments and the exercise of discretion in policing.

Design/methodology/approach

A factorial vignette survey with traffic stop scenarios based on US Court of Appeals decisions was administered to 396 police officers across six states. Officers were asked to indicate their assessment of the presence of reasonable suspicion and the likelihood that they would extend the stop for investigatory purposes.

Findings

Officers' reasonable suspicion judgments are significantly influenced by the vignette facts and align with court ruling expectations. However, even in the presence of reasonable suspicion, responses indicate a limited use of officer discretion to extend the stop.

Originality/value

Analyses of officer decision-making often rely on large datasets with easy indicators of location, officer demographics and citizen demographics, but rarely consider the facts of individual cases. This study suggests more experimental research is needed to consider the impact of case facts on officer judgments and discretionary activity.
The relationship between spirituality and mental health among police trainees
Authors: He Mu , Lu Jiahui , Chen Juliet Honglei , Tong Kwok Kit
Published: April 2023

Purpose

This study aimed to investigate the relationship between spirituality, including religious spirituality (i.e. supernatural beliefs) and secular spirituality (i.e. social beliefs), and mental health among police trainees.

Design/methodology/approach

Participants in this study were police trainees of a police academy. An online survey was conducted to measure spirituality and mental health among these police trainees. The association between spirituality and mental health was analyzed using hierarchical linear regression and hierarchical logistic regression with demographic variables (i.e. gender and age) controlled for.

Findings

The results revealed that the police trainees with stronger secular spirituality tended to have better general mental health. Higher levels of secular spirituality were significantly associated with lower levels of mental illness risk and suicidal ideation. By contrast, religious spirituality was not significantly related to police trainees' mental health.

Originality/value

The present study is the first to empirically investigate the relationship between spirituality and mental health among police trainees. The findings may be enlightening for future research on the mental health of police officers and trainees, and provide novel perspectives and pragmatic implications for the development of spirituality-based prevention strategies and intervention programs for enhancing the mental health and well-being of the police.
Corrosion inhibition of aluminium in 0.3 M HCl using starch mucor in potassium iodide as inhibitor
Authors: Ezeamaku Uchenna Luvia , Eze Innocent , Odimegwu Nkiru , Nwakaudu Angela , Okafor Amarachukwu , Onukwuli Okechukwu Dominic , Nnanwube Ikechukwu Abuchi
Published: April 2023

Purpose

The purpose of this study is to investigate starch mucor (SM) in potassium iodide (KI) as corrosion inhibitor of aluminium in hydrochloric acid (HCl) medium.

Design/methodology/approach

The SM in KI was characterized by gravimetric, scanning electron microscopy, electrochemical impedance spectroscopy measurements, potentiodynamic polarization and gas chromatography-mass spectrometer techniques. The inhibition efficiency was optimized using response surface methodology.

Findings

The result revealed that the inhibitor inhibited corrosion at a low concentration with the rate of inhibition increasing as the concentration of the inhibitor increased. The inhibition efficiency increases as the temperature was increased with slight incorporation of the inhibitor (SM in KI). This indicates that the corrosion control is both inhibitor (SM in KI) and temperature dependent.

Originality/value

The research results can provide the basis for using SM in KI as corrosion inhibitor of aluminium in HCL medium. Mixed-type inhibitor nature of SM was proved by cathodic and anodic nature of the polarization curves.
Reference in urban public libraries: current trends and future implications
Authors: Saunders Laura , Williams Rachel , Galarneau Genevieve , Gifford Gianna C.
Published: April 2023

Purpose

The purpose of this study was to get a baseline understanding of the state of reference services in urban public libraries in the United States.

Design/methodology/approach

The researchers surveyed all members of the Urban Libraries Council, a network of public library systems in urban centers across the country. The survey asked about their reference services, including how reference is offered, volume and types of questions and staff responsibilities. Participants were also asked how reference has changed in the past 5–10 years and what changes they anticipate in the future.

Findings

This study found that the vast majority of urban public libraries still maintain a physical reference desk, but most also offer reference services in other formats as well. Most libraries have seen numbers of reference questions decline. Reference staff members are engaged in instruction, programming and community outreach as well. Looking ahead, some libraries expect reference questions to continue to decline and demand for virtual services to increase.

Practical implications

Directors and reference staff of public libraries, especially those in urban and suburban settings, will find these results useful for benchmarking against their own experiences and for planning for future changes.

Originality/value

While discussions of changes in reference service and volumes of reference questions are plentiful, as are predictions of how these declines will impact reference services, there is little current research on the actual state of those services. This study fills a gap in the literature by providing a baseline overview of the reference services in urban public libraries.