bluuebunny/crossref_metadata_2025 huggingface dataset:
Long adhesive joints in façade applications exposed to wind suction
Authors: Nečasová B , Liška P , Šlanhof J , Sedlák P , Motyčka V
Published: July 2020

This paper provides an insight into the investigation of long thick-layer adhesive façade joint resistance to negative pressure loads, i.e. wind suction. The real structural response to wind actions was simulated with reference to ETAG 034. Each specimen represented a reference façade section. The experiment focused on four different adhesive systems with flexible high strength 1-K polyurethanes and 1-K modified silyl polymers. Several variants of the test assemblies were tested: 1) a test assembly with an adhesive joint when a) the manufacturers’ application instructions for the system were followed and b) the instructions were violated; 2) a test assembly with a mechanical joint. These variants made it possible to compare the properties of both fastening methods, and moreover, to assess the impact of the mounting tape on the properties of the adhesive joint. The comparison of adhesive joints and a mechanical joint proved the greater structural stiffness and stress resistance of bonded assemblies. Monitoring showed that a local failure of the fastening element between the load-bearing frame and supporting structure caused the failure of the bonded assemblies, whereas the specimen with mechanically attached cladding failed due to pull-through of the fasteners. The average failure load of the bonded assembly was 10.88 kPa. In contrast, the failure load of the segment with mechanical fasteners was 10.12 kPa. Even though the difference in maximum pressure loads was only around 7%, the recorded values clearly demonstrate that the weakest part of the whole façade system is the mechanical joint, not the bonded one. Furthermore, the comparison of the results for segments with and without mounting tape showed that tape can have a major impact on the bond strength, since in case of the test specimens without mounting tape, the recorded failure load was a maximum of 30% higher.
Dynamic responses of a high-speed train passing a deformed bridge using a vehicle-track-bridge coupled model
Authors: Gou Hongye , Liu Chang , Zhou Wen , Bao Yi , Pu Qianhui
Published: July 2020

With the development of the railway network in a harsh environment, the additional bridge deformations accumulated over time may endanger high-speed trains passing through a bridge, since the bridge deformation directly affect the geometry of the track on the bridge, thus affecting the dynamic responses of the train. This paper investigates the effects of different types of bridge deformation on the dynamic responses of the high-speed train passing through a deformed bridge. First, a finite element model is established for a high-speed railway bridge to study the dynamic responses of vehicle-track-bridge system under bridge deformations. Then, the rail deformation caused by bridge deformation is calculated using a bridge-track deformation mapping model, and used as the excitation to the vehicle-track-bridge system to study the influence of bridge deformations on the dynamic responses of the train. Results show that the vertical bridge deformations mainly affect the vertical vehicle dynamic indices, and have negligible effect on the lateral dynamic indices. The additional bridge deformation generates an additional low-frequency excitation to the train. The bridge deformations mainly affect the dynamic responses at specific characteristic frequencies, which are independent on the magnitude of the deformation. The frequencies for bridge deformations are magnified at about 1 Hz, indicating that the additional bridge deformation may aggravate the vertical vibration of the train.
Mapping repertoires of collective action facing the COVID-19 pandemic in informal settlements in Latin American cities
Authors: Duque Franco Isabel , Ortiz Catalina , Samper Jota , Millan Gynna
Published: July 2020

How are civil society organizations responding to COVID-19’s impacts on informal settlements? In Latin America, civil society organizations have developed a repertoire of collective action, seeking to provide immediate and medium-term responses to the emergency. This paper aims to map these initiatives and identify strategic approaches to tackle the issues, given the strengths of those undertaking the initiative, and the scope, purpose and sphere of intervention. Using direct contact, a survey, and a virtual ethnography with social organizations has allowed us to identify and characterize the initiatives. The repertoire focuses on emergency measures around food security, and pedagogies for prevention, sanitation and income relief at the neighbourhood and district levels. We argue that the civil society response repertoire is diverse in form and resources but limited in scope; meanwhile the urgency of the situation and the mismatch with state action mean that crucial spheres of informality, vital to cultivating grounds for a healthy recovery phase, are being neglected.
Impact of antiretroviral regimen on viral suppression among pregnant women living with HIV in Brazil
Authors: Pascom Ana R Pati , Fonseca Fernanda F , Pinho Rosana Gonçalves Gonçalves , Perini Filipe Barros , Pereira Gerson , Avelino-Silva Vivian I
Published: July 2020

Human immunodeficiency virus (HIV) viral load (VL) during pregnancy is a critical determinant of the risk of HIV mother-to-child transmission (MTCT). Prior studies suggest that VL suppression is influenced by antiretroviral regimen. In this study, using secondary real-life data from the Ministry of Health of Brazil, we compared VL suppression at 60–180 days after the first antiretroviral therapy (ART) prescription during pregnancy and time to undetectable VL among pregnant women under treatment with double nucleoside/nucleotide regimens combined with efavirenz, boosted lopinavir, boosted atazanavir, or raltegravir, with adjustment for potential confounders in multivariable models. A total of 18,997 pregnant women living with HIV were included in the study. Compared to regimens containing lopinavir, we found that atazanavir-, efavirenz-, and raltegravir-based regimens were superior in achieving both outcomes after adjustment for age, social vulnerability index, time under ART, baseline CD4+ cell count, and baseline HIV VL. Raltegravir-containing regimens had the highest adjusted odds/rates of VL suppression compared to patients with other regimens. Elimination of HIV MTCT is still a critical public health issue in many countries. Our findings suggest that raltegravir-based regimens were superior when compared to efavirenz-, lopinavir-, and atazanavir-based antiretroviral regimens in achieving suppression of HIV VL.
Optimal Capital Structure and Speed of Adjustment under Hyperinflation and Dollarization
Authors: Mbulawa Strike , Okurut Nathan F. , Ntsosa Mogale , Sinha Narain
Published: July 2020

Economic challenges in Zimbabwe have resulted in firms being pushed out of their optimal leverage. Firms are faced with the need to move back to the optimal level of financing to improve their value. They tend to adjust quickly to the optimal level whenever failing to do so is costlier. This study employs a dynamic capital structure model to examine the determinants of optimal leverage and the speed of adjustment under a hyperinflation and dollarization period (2000–2016). The study shows that firms have an optimal leverage and there are costs of adjusting to this level of capital. Findings are consistent with theoretical predictions of the static trade-off theory (STT) and agency theory. The adjustment factors for all the models were found to be at least 0.475 and are higher under hyperinflation than under dollarization. Both firm and macroeconomic factors explain the optimal capital structure while the former also explains the speed of adjustment. Policies focusing on improving access to and reducing costs for finance will assist firms to maximize value as they adjust to the desired financing mix. The policies adopted may vary in response to the economic environment.
The role of peripheral perfusion index in differential diagnosis of cardiac and pulmonary-origin dyspnea in emergency service
Authors: Karaman Kıvanç , Sağlam Gürmen Ekim
Published: July 2020

Introduction:

Pulmonary and cardiac disorders are diagnosed in most patients presenting to the emergency department with dyspnea. Discrimination of pulmonary and cardiac pathologies from each other and early intervention have vital importance. Various methods have been used for assessment of peripheral perfusion, and the peripheral perfusion index) has gained popularity in recent years. This study aimed to investigate the contribution of peripheral perfusion index to the evaluation process in patients presenting with the complaint of dyspnea and diagnosed with either a pulmonary or cardiac pathology.

Materials and Methods:

We retrospectively reviewed the charts of patients who presented to emergency department with dyspnea between 1 July 2018 and 1 July 2019. Patients in whom the cause of dsypnea was determined to be a cardiac or pulmonary pathology were included in the study. The age, gender, peripheral perfusion index value at admission, the diagnosis, and the hospitalization status were recorded.

Results:

One hundred and ninety patients consisting of 106 (55.8%) males and 84 (44.2%) females were included in our study. While a pulmonary pathology was determined in 141 (74.2%) patients and a cardiac pathology in 49 (25.8%) patients, 72 (37.9%) patients were decided to be hospitalized. No difference was determined between patients with pulmonary and cardiac pathologies regarding peripheral perfusion index. When the patients were compared regarding hospitalization status and discharge from the emergency department, no significant difference was found to be present between the groups.

Conclusion:

Since peripheral perfusion index is a noninvasive, easy-to-perform, rapid, and reproducible test, it has been promising as a prognostic and diagnostic parameter. However, it has been realized that PPI was unsuccessful in the evaluation of patients with dyspnea, in the differential diagnosis of cardiac and pulmonary pathologies and prediction of hospitalization status in the emergency department.
Landing efficiency control of a six degrees of freedom aircraft model with magneto-rheological dampers: Part 2—control simulation
Authors: Kang Byung-Hyuk , Yoon Ji-Young , Kim Gi-Woo , Choi Seung-Bok
Published: July 2020

In Part 1 of this work, both the kinematic and dynamic equations of aircraft landing model integrated with magneto-rheological damper were derived. In Part 2, the landing efficiency is analyzed through landing motion simulation which is performed on the basis of the model equations derived in Part 1. To investigate the landing efficiency with respect to the operating force control of magneto-rheological fluid, two different control logics for magneto-rheological damper are designed. The first one is the skyhook controller, which is known to be simple, but very effective for the semi-active control system. In this control logic, the switching condition depending on the compression and extension mode of the damper is determined to achieve maximum energy dissipation. The second one is a modified skyhook controller associated with the semi-active bouncing control. This controller is introduced to prevent bouncing of the main landing gear tires and to reduce the roll motion of the aircraft. The landing efficiency is evaluated at several rates of descent, and its distinct features such as tire displacement and pitch angle are compared in the time domain.
Experiential Exercise in Team Formation in the Capstone: Providing Students With the Information to Make Good Team Choices
Authors: Pearlstein John
Published: July 2020

Just as there is a tension between business professors’ practice of assigning team projects, especially in capstone courses, and students’ inclination to avoid them, there is also a tension between students’ desire to choose their own teammates and professors’ belief that they can do a better job of team creation. Professors have learned that when students choose teams, they can have problems of homogeneity, unbalanced skills, and unchosen students; however, when professors try to form teams for fairness and balance, students often resent it. This article presents a fun, engaging experiential exercise for effective team formation that combines the benefits of both student-directed and professor-directed methods. The exercise, conducted over one or two class meetings, allows students to learn about well-balanced team construction, present themselves to their classmates, interview each other, and choose who they would like to work with without the restrictions of seat proximity or prior connection. Results show students perceived that their teams were more available for meetings and exhibited more cohesiveness and higher performance than previous project teams, and strongly preferred this method. Instructions, worksheets, diagrams, and empirical support are shared in this article to allow professors to smoothly implement this exercise in their own classrooms.
Becoming a Teacher Scholar: The Perils and Promise of Meeting the Promotion and Tenure Requirements in a Business School
Authors: Mu Fengli , Hatch James
Published: July 2020

Many business schools continue to use contribution in teaching, research, and service as measures of faculty performance. There has been a long tradition of thinking of faculty as making their research contribution within a specific subdiscipline. We call these teaching and discipline scholars (TDS). However a growing number of faculty who, although they teach in a subdiscipline, are choosing to make their research contribution in the teaching and learning area. We call these persons teaching and learning scholars (TLS). A major hurdle facing TLS candidates is a promotion and tenure (P&T) system primarily designed for teaching and discipline scholars. This article takes a granular look at the typical P&T system within business schools. It proposes a way of thinking about what is typically meant by teaching ability and how it might be measured. It then discusses what is meant by research, how this definition might be applied to measure the output of TLSs and the special challenges for TLSs in having their research accepted as part of their P&T portfolio. Suggestions are provided for how the TLS may navigate the P&T process in light of these challenges.
Congenital Heart Diseases Associated With Cleft Lip and Palate and Its Impact on Surgical Treatment Planning of Patients With Cleft Lip and Palate—A Cross-Sectional Study
Authors: Rao Gautam , Desai Anil , Kumar Niranjan
Published: July 2020

Objectives:

The aim of this study is to know the prevalence, type of congenital heart diseases (CHDs), and its association with cleft lip and/or palate and to know the impact of CHDs on surgical treatment planning of cleft lip and palate from a craniofacial hospital specializing in orofacial clefts, head and neck cancer, and trauma management.

Design:

A total of 1381 patients with nonsyndromic cleft lip and palate were included in the study. This is a hospital-based retro–prospective case record analysis. The data were collected from clinical records of the patients which included clinical, chest radiographic and 2D echocardiographic findings. Total incidence of CHDs and its impact on treatment planning was evaluated using κ statistics and χ2 test.

Results:

There were 32 (2.32%) cleft lip and palate patients with CHDs. In 2 patients, cleft surgery was delayed by 6 to 9 months to allow the defect to decrease in size. Subacute bacterial endocarditis prophylaxis was administered in 7 patients before cleft surgery. Cardiac surgery was advised prior to cleft surgery in 3 patients. Sixteen patients with CHDs were not taken for cleft surgery considering the potential risk to the patient’s life as they had multiple cardiac anomalies. There were no intraoperative and postoperative complications in these patients.

Conclusion:

The results emphasize the association between clefting and CHD. The collected data suggest that there should be careful examination of children with cleft lip and palate for signs of heart disease. This could significantly reduce the morbidity/mortality of cleft lip and palate surgery making it more predictable and safer.
Guilty by Association: Using Word Embeddings to Measure Ethnic Stereotypes in News Coverage
Authors: Kroon Anne C. , Trilling Damian , Raats Tamara
Published: July 2020

The current study provides a new level of empirical evidence for the nature of ethnic stereotypes in news content by drawing on a sample of more than 3 million Dutch news items. The study’s findings demonstrate that universally accepted dimensions of stereotype content (i.e., low-status and high-threat attributes) can be replicated in news media content across a diverse set of ingroup and outgroup categories. Representations of minorities in newspapers have become progressively remote from factual integration outcomes, and are therefore rather an artifact of news production processes than a true reflection of what is actually happening in society.
Playing Baroque Lines through a Museum Landscape with Deleuze, Guattari, and Klee
Authors: Eakle Jonathan , Bailey Erin
Published: July 2020

This article uses concepts and ontologies drawn from Deleuze and Guattari by assuming a complex of lines inspired by the paintings of Paul Klee in an art museum show. The post-qualitative approach is by way of Baroque mechanics and is comprised of three types of lines that convey the events: crack lines, break lines, and lines of escape (or leakage). An intent is to show how philosophies, art, and life merge with lines of animals, colors, and musical refrains during and beyond the Klee exhibition.
Tensile properties of composite metal foam and composite metal foam core sandwich panels
Authors: Marx Jacob , Rabiei Afsaneh
Published: July 2020

Steel-steel composite metal foam (SS-CMF) and composite metal foam core sandwich panels (SS-CMF-CSP) were manufactured and tested under quasi-static tension. The SS-CMF-CSP were manufactured by attaching stainless steel face sheets to a SS-CMF core using solid-state diffusion bonding. SEM imaging was used to inspect the microstructure of SS-CMF and compare it to that of SS-CMF-CSP. The results indicate a cohesive bond line at the interface of the core and the face sheets. The bare SS-CMF samples had an ultimate tensile strength between 75–85 MPa and a failure strain between 7.5–8%. The normalized tensile strength of the SS-CMF was approximately 24 MPa/(g/cm3), 410% higher than other comparable metal foams, with a specific energy absorption of 0.95 J/g under tension. The uniform porosities and strong bonding between the sphere wall and matrix seem to be the strengthening factor of SS-CMF under tension when compared to other metal foams. The ultimate tensile strength of the SS-CMF-CSP was 115% stronger than the bare SS-CMF at 165 MPa with an average failure strain of 23%. The normalized strength of the SS-CMF-CSP was 52% higher than the bare SS-CMF. The modulus of elasticity was approximated using the rule of mixtures for the SS-CMF and the SS-CMF-CSP and the experimental results were found to lie within the calculated upper and lower bounds.
A case of undiagnosed X-linked retinoschisis presenting as unilateral macular demarcation line
Authors: Cozzupoli Grazia M , Amoroso Francesca , Bacquet Jean-Louis , Miere Alexandra , Mouallem-Beziere Alexandra , Souied Eric
Published: July 2020

Purpose:

We intend to describe an uncommon presentation of X-linked juvenile retinoschisis (XLRS) in a 17-year-old boy showing a macular demarcation line in the right eye and an inferior peripheral bullous retinoschisis in both right and left eye, at his first ophthalmologic examination.

Methods:

The patient underwent a complete ophthalmologic examination including best-corrected visual acuity assessment, anterior segment and dilated fundus examination, ultra-wide-field retinography, spectral-domain optical coherence tomography, fundus autofluorescence, fluorescein angiography, electroretinography, visual field test, and genetic molecular testing.

Results:

We report a rare case of genetically confirmed XLRS, presenting as a unilateral mildly-pigmented macular demarcation line (advanced sequel of unilateral spontaneous retinal reattachment of a previous retinal detachment or bullous retinoschisis) without foveoschisis in the fellow eye.

Conclusion:

XLRS is the most frequent cause of macular retinoschisis. The hallmark of XLRS is the evidence of a foveoschisis presenting with a characteristic spoke-wheel aspect in patients younger than 30 years of age. It is important to recognize uncommon presentations of XLRS so that the correct diagnosis is made, in order to provide the patients with appropriate genetic counseling and therapeutic care.
Mitigation of traumatic blepharoptosis with “central levator tuck”: A novel approach in upper eyelid repair
Authors: Mehta Aditi , Thakur Umang , Saini Manu , Adiga Sushant , Grewal Sartaj Singh , Kashyap Himanshu , Singh Simar Rajan , Singh Manpreet , Pujari Amar
Published: July 2020

Purpose:

Complex upper eyelid lacerations can present to the emergency department after a myriad of trauma. The goal of the surgical repair is anatomical and functional recovery along with symmetrical cosmesis. Despite meticulous surgery, post traumatic blepharoptosis may develop. We describe an additional step during upper eyelid laceration repair to help mitigate the development of traumatic blepharoptosis.

Methods:

Patients with traumatic eyelid laceration without head injury, globe injury or associated orbital fractures, who were planned for a primary upper eyelid repair were included. Intraoperatively, wound margins and tissues were identified to establish anatomical continuity. After the LPS muscle was reinserted onto the tarsus, a single, central suture LPS plication – the “ central levator tuck” was performed. This helped in improving the muscle action as well as strengthening its reattachment onto tarsus.

Results:

Four cases underwent laceration repair with this modified technique. The nature of eyelid injury, surgical technique, and the outcome at 6 months is described. Three patients had a successful outcome, whereas one patient developed early scarring which reduced with scar therapy over time.

Conclusion:

We describe a simple and effective “central levator tuck” technique for traumatic eyelid laceration repair with optimal functional and cosmetic outcome while reducing the development of blepharoptosis in four patients.
The experimental study of tissue integration into porous titanium implants
Authors: Tikhilov Rashid , Shubnyakov Igor , Denisov Alexey , Konev Vladimir , Gofman Iosif , Starchik Dmitry , Mikhailova Polina , Bilyk Stanislav
Published: July 2020

Introduction:

Due to a lack of uniform shapes and sizes of bone defects in hip and knee joint pathology, their fixing could benefit from using individually manufactured 3D-printed highly porous titanium implants. The objective of this study was to evaluate the extent of bone and muscle tissue integration into porous titanium implants manufactured using additive technology.

Materials and methods:

Porous and non-porous titanium plates were implanted into the latissimus dorsi muscle and tibia of 9 rabbits. On days 1, 60 and 90 animals were examined with x-rays. On day 60 histological tests were carried out. On day 90 the tensile strength at the implant-tissue interface was tested.

Results:

Histological analysis of muscle samples with porous titanium implants showed integration of connective tissue and blood vessels into the pores. Bone defect analysis demonstrated bone ingrowth into the pores of titanium with a minimal amount of fibrous tissue. The tensile strength of the muscular tissue attachment to the porous titanium was 28 (22–30) N which was higher than that of the control group 8.5 (5–11) N. Bone tissue attachment strength was 148 (140–152) N in the experimental group versus 118 (84–122) N in the control group.

Conclusions:

Using additive technology in manufacturing 3D-printed highly porous titanium implants improves bone and muscle integration compared with the non-porous material of the control group. This could be a promising approach to bone defect repair in revision and reconstruction surgery.
Relationship between cam morphology, hip symptoms, and hip osteoarthritis: the Musculoskeletal pain in Ullersaker STudy (MUST) cohort
Authors: Kemp Joanne L , Østerås Nina , Mathiessen Alexander , Nordsletten Lars , Agricola Rintje , Waarsing Jan H , Heerey Joshua J , Risberg May Arna
Published: July 2020

Background:

The primary aim of this study was to determine the prevalence of cam morphology in a cohort of people aged 40–55 years. Secondary aims were to: (1) determine differences in participant characteristics, physical impairments, radiographic and ultrasound appearances of people with and without cam morphology; and (2) explore associations between cam morphology and radiographic measures of hip osteoarthritis (OA).

Methods:

107 people (68% women; 49 ± 4 years) from the Musculoskeletal pain in Ullensaker (MUST) Study underwent the clinical and imaging examinations. Examinations included questionnaires, hip range, functional task performance, pelvic radiographs and ultrasound. Alpha angle and radiographic hip OA (Kellgren Lawrence (KL) and minimal joint space (MJS)) were determined.

Results:

The prevalence of cam morphology was 42% and was bilateral in 47%. People with cam morphology were 6 times more likely to have a KL score ⩾2 (adjusted odds ratio [95% confidence intervals, p-value]) 6.386 [1.582–37.646, p = 0.012]) and 4 times more likely to have MJS <2.0 mm (adjusted odds ratio 4.032 [1.031–12.639, p = 0.045]). The prevalence of radiographic OA features ranged from 4–13% in people with cam morphology, and 0–3% in those without. Those with cam morphology also demonstrated reduced hip flexion and rotation range ( p = 0.018–0.036) compared with those without. There was no association between ultrasonic features and patient reported outcomes, and cam morphology.

Conclusions:

In a cohort aged 40–55 years, the prevalence of cam morphology was high (42%), with a significant relationship between cam morphology and radiographic measures of hip OA. Further longitudinal studies should explore the relationship between cam morphology and hip OA in younger people.
A descriptive analysis of an on-demand telehealth approach for remote COVID-19 patient screening
Authors: Ratwani Raj M , Brennan David , Sheahan William , Fong Allan , Adams Katharine , Gordon Allyson , Calabrese Mary , Hwang Elizabeth , Smith Mark , Booker Ethan
Published: July 2020

Introduction:

COVID-19 requires methods for screening patients that adhere to physical distancing and other Centers for Disease Control and Prevention guidelines. There is little data on the use of on-demand telehealth to meet this need.

Methods:

The functional performance of on-demand telehealth as a COVID-19 remote patient screening approach was conducted by analysing 9270 patient requests.

Results:

Most on-demand telehealth requests (5712 of 9270 total requests; 61.6%) had a visit reason that was likely COVID-19 related. Of these, 79.1% (4518 of 5712) resulted in a completed encounter and 20.9% (1194 of 5712) resulted in left without being seen. Of the 4518 completed encounters, 19.1% were referred to an urgent care centre, emergency department or COVID-19 testing centre. The average completed encounter wait time was 26.5 min and the mean visit length was 8.8 min. For patients that completed an encounter 42.8% (1935 of 4518) stated they would have sought in-person care and 9.1% stated they would have done nothing if on-demand telehealth was unavailable.

Discussion:

On-demand telehealth can serve as a low-barrier approach to screen patients for COVID-19. This approach can prevent patients from visiting healthcare facilities, which reduces physical contact and reduces healthcare worker use of personal protective equipment.
Academic English education through research-informed teaching: Capturing perceptions of Bangladeshi university students and faculty members
Authors: Jamil Md Golam
Published: July 2020

This article arose in response to the recent impetus for embedding inquiry-based approaches in higher education. It draws upon the perceptions of students and faculty members regarding inquiry-based education in Academic English (AE) programmes at universities in Bangladesh within an English as a Foreign Language (EFL) context. Research-informed teaching (RIT), an intellectually stimulating and inquiry-based learning approach, is the conceptual base of the study. Data were collected from four Bangladeshi universities using a learning experience survey with students ( n = 319) and semi-structured interviews with six EFL faculty members. The findings provide four guiding principles on the design and implementation of RIT-based AE programmes: (1) addressing wider educational objectives in AE education, (2) incorporating applied features in the learning activities, (3) building faculty members’ research literacy and practice, and (4) establishing academic collaboration across disciplines. While the findings are derived from Bangladesh higher education, the guiding principles and strategies have resonance internationally.
Integrated design for underground space environment control of subway stations with atriums using piston ventilation
Authors: Wen Yueming , Leng Jiawei , Yu Fei , Yu Chuck Wah
Published: July 2020

In subway stations, the piston effect plays an important role in enhancing ventilation to improve subway environment and reduce energy consumption. However, it may induce negative impacts on environmental health and thermal comfort, i.e. air pollution and strong wind. Traditionally, the architecture and ventilation systems are designed separately, and normal ventilation design follows architectural layout. Actually, the architecture design can have a significant influence on the ventilation performance, e.g. airflow pattern. Therefore, this study aims to integrate the design pattern of the architecture with an appropriate ventilation system. A typical subway station of Nanjing (in China) was considered. A dynamic-mesh based computational fluid dynamics (CFD) method was adopted to simulate ventilation performance in the presence of piston effect. Field measurements were conducted to validate the numerical method. New measures were proposed from the perspectives of architectural design to improve the ventilation effect, including enlarging atrium space, adding atrium vents and funnel-shaped exits, etc. The numerical results show that the optimal architectural design could provide a significant improvement towards the airflow environment and ventilation efficiency while avoiding serious air pollution. The proposed integrated-design pattern could further facilitate the creation of an ‘energy-saving’ and ‘healthy’ underground space environment.
The time of the past: Exploring the rhythms of a pre-Hispanic urban settlement in the coastal Andes (AD 550–850)
Authors: Fernandini Parodi Francesca
Published: July 2020

As archaeologists we experience past time in the present, challenging linear time as we deal with the remains of different moments, events and people. This multi-scalar approach to time stimulates a flexible discussion of the past, understanding it not only in the absolute way provided by calendric dates, but also enmeshed within events and anchored by layers that were lived thousands of years ago. In this article, we will explore the notions of time of the people living in a densely populated settlement in the coastal Andes (AD 550–850), by focusing on the seasonality of quotidian practices, on cyclic constructive events and on the recurrent interment of people within residences.
Security, usability, and biometric authentication scheme for electronic voting using multiple keys
Authors: Ahmad Masood , Rehman Ateeq Ur , Ayub Nighat , Alshehri MD , Khan Muazzam A , Hameed Abdul , Yetgin Halil
Published: July 2020

We propose electronic voting authentication scheme, which is a key management mechanism for electronic voting system intended to limit the number of attacks on a polling station and strengthen the security control. The motivation is to diversify security requirements of messages exchanged between polling stations. There are different types of messages exchanged between polling stations and each type of message has different security needs. A security mechanism developed on the basis of a single key is not enough to ensure the diverse security needs of voting network. In electronic voting authentication scheme, every polling station is responsible to support three different types of keys. These are global key, pairwise key, and individual key. The global keys are public keys shared with all polling stations in the voting network. The pairwise key can be used for communication with polling stations. Individual keys will be used for communication with the server. To ensure authentication of local broadcast, electronic voting authentication scheme uses one-way key chains in a well-organized way. The support of source authentication is a visible advantage of this scheme. We examine the authentication of electronic voting authentication scheme on numerous attack models. The measurement demonstrates that electronic voting authentication scheme is very operative in protecting against numerous elegant attacks such as wormhole attack, Sybil attack, and HELLO Flood attack. The proposed system is evaluated and the results demonstrate that the proposed system is practical and secure as compared to the direct recording electronic and manual systems.
The Bus Incident
Authors: Martin Jennifer , Beese Jane
Published: July 2020

This case is based on the real incidents occurring in Oakland, California in the fall of 2013. The case was adapted to occur within a school setting, and the schools and district noted within are entirely contrived for the purposes of this case. However, the original bus number, 57, was retained to pay homage to the real victims. Intimidation, bullying, and harassment that take place in schools greatly affect lesbian, gay, bisexual, transgender, and queer (LGBTQ) youth. LGBTQ students, who experience school-based discrimination and harassment, experience more negative academic outcomes and psychological struggles than their non-LGBTQ peers.
Triclosan applications for biocidal functionalization of polyester and cotton surfaces
Authors: Orhan Mehmet
Published: July 2020

For 20 years, antibacterial functionalization has been one of the most attractive research fields in the textile industry. Nowadays, globalization has spread the microorganisms everywhere and produced many epidemics and pandemics such as smallpox, cholera, tuberculosis, yellow fever, Spanish flu, and coronavirus. The textile materials treated with triclosan would be a strong alternative to obtain antibacterial function against microorganisms for the medical applications, such as face masks, lab coats, and wound dresses. This study aimed to investigate the characterization, antibacterial properties, and durability of triclosan on polyester, polyester/cotton, and cotton surfaces. The pure triclosan and presence of triclosan in solutions were detected by gas chromatography–mass spectrometry chromatograms. It can be seen that surfaces were homogeneously covered by triclosan on scanning electron microscope micrographs, and there were new bands on Fourier transform infrared spectra after treatments. Large inhibition zones around all surfaces were observed, and antibacterial activity slightly increased depending on increasing chemical concentrations. The samples demonstrated strong biocidal activity to bacteria for 3 h. They lost their antibacterial properties after washing, but they showed good antibacterial (bactericidal) properties and satisfactory durability to washes. The results show that triclosan is a highly effective and durable chemical on polyester and cotton surfaces for medical textile applications.
Permeability impact on electromagnetohydrodynamic flow through corrugated walls of microchannel with variable viscosity
Authors: Rashid Madhia , Nadeem Sohail , Shahzadi Iqra
Published: July 2020

This investigation based on electromagnetohydrodynamic flow in microchannels through lightly corrugated walls effects is reported in the presence of variable liquid properties. In microparallel plates, we consider incompressible and electrically conducting viscous fluid. With small amplitudes, the wall corrugations are described by periodic sin waves. The governing equations are rendered dimensionless and solved with the help of the perturbation technique. The analytical solutions for velocity are obtained and analyzed graphically. A connection between flow rate and roughness is acquired by perturbation solutions of the stream function. By utilizing numerical computations, we analyzed the corrugation consequences on the velocity for electromagnetohydrodynamic flow. We graphically clarified the velocity and temperature profiles and their dependencies on all parameters. The three-dimensional velocity and contour distributions shown that the wall roughness can cause changes in the velocity distribution. For in phase the phase difference among the two corrugated walls is equals to 0°, and for out of phase the phase difference is equal to 180° between the two walls. The wave phenomenon of the flow shape becomes obvious with the expansion of the corrugation. The electromagnetohydrodynamic velocities first grow and then reduce. The electromagnetohydrodynamic velocity increases for Reynolds number, Hartmann number, and Darcy parameter. Velocity profile decreases for variable viscosity, velocity slip parameter.
Power quality analysis of a large grid-tied solar photovoltaic system
Authors: Alhussainy Abdullah Ali , Alquthami Thamar Saad
Published: July 2020

Over the last decades, the deployment of large solar-based photovoltaic power plants has grown tremendously. The undesirable impact of high integration level of photovoltaic systems has led energy stakeholders to regulate such penetration to avoid this negative impact. One major concern with regard to photovoltaic penetration is the issue of power quality. Poor power quality can be a source of system disturbance and major economic losses. However, the power quality analysis is not widely discussed in the literature, with most of the studies focusing on the harmonic issues as potential power quality problem, but this study shows that there are a number of power quality issues, such as undervoltage, overvoltage, power fluctuation, and power factor. This study presents practical approaches to a grid-connected solar photovoltaic plant with associated control circuits developed in the time-domain. The power quality of a grid-connected solar photovoltaic plant is investigated by an analysis of the inverter output voltage and nominal current for different photovoltaic plant sizes. Also, the effect of different conditions of solar irradiance and ambient temperature on the power quality is analyzed. To identify power quality issues, a photovoltaic plant time-domain model is developed using Power Systems Computer Aided Design software. Various solar photovoltaic plant controls such as maximum power point tracking and modulation signals sinusoidal pulse width modulation and pulse width modulation for direct current-to-direct current boost converter are developed and integrated into the simulation environment. Several case studies are performed taking into account different photovoltaic plant ratings such as 250 kW–3 MW, where the point of common coupling is monitored.
Error correction of depth images for multiview time-of-flight vision sensors
Authors: He Yu , Chen Shengyong
Published: July 2020

The developing time-of-flight (TOF) camera is an attractive device for the robot vision system to capture real-time three-dimensional (3D) images, but the sensor suffers from the limit of low resolution and precision of images. This article proposes an approach to automatic generation of an imaging model in the 3D space for error correction. Through observation data, an initial coarse model of the depth image can be obtained for each TOF camera. Then, its accuracy is improved by an optimization method. Experiments are carried out using three TOF cameras. Results show that the accuracy is dramatically improved by the spatial correction model.
Long head of biceps tenotomy versus tenodesis: a systematic review and meta-analysis of randomized controlled trials
Authors: Ahmed Abdulaziz F , Toubasi Ammar , Mahmoud Shady , Ahmed Ghalib O , Al Ateeq Al Dosari Mohammed , Zikria Bashir A
Published: July 2020

Objective

To compare tenotomy versus tenodesis for the treatment of long head of the biceps tendon pathologies. The primary outcome was the shoulder functional outcome. The secondary outcomes consisted of postoperative pain, elbow flexion and forearm supination strengths and postoperative complications.

Methods

PubMed, MEDLINE, Google Scholar and Web of Science were searched until April 2020. Included studies were randomized controlled trials with a minimum 12 months’ follow-up.

Results

Both treatments had similar improvement on the Constant–Murley score at 6 months and 12 months. However, tenotomy had a significantly lower Constant–Murley score at two years with a mean difference of −1.13 (95% confidence interval −1.9, −0.35). Furthermore, tenotomy had a risk ratio of 2.46 (95% confidence interval 1.66, 3.64) for developing Popeye’s deformity. No significant difference was detected in other functional outcomes, pain, or elbow flexion and forearm strength indices.

Discussion

Tenodesis and tenotomy are both well-established techniques that similarly yield satisfactory outcomes. Despite that tenodesis had a statistically significant better Constant–Murley score at two years, this was clinically irrelevant. With the current evidence, we recommend either technique for the management of the long head of the biceps tendon pathologies.

Level of evidence

Therapeutic, Level II
Apatinib treatment may improve survival outcomes of patients with hepatitis B virus-related sorafenib-resistant hepatocellular carcinoma
Authors: Zhang Yingqiang , Huang Guihua , Miao Hongfei , Song Ze , Zhang Xiaoying , Fan Wenzhe , Wang Yu , Li Jiaping , Chen Yong
Published: July 2020

Aims:

This study aimed to (a) assess the effectiveness and safety of apatinib as a subsequent treatment for patients with sorafenib-resistant hepatocellular carcinoma (HCC), and (b) identify the clinical factors influencing their treatment outcomes.

Methods:

The electronic medical records of consecutive patients with newly diagnosed advanced HCC treated with first-line sorafenib from 2015 to 2017 were retrospectively reviewed. Patients who were confirmed to have primary resistance to sorafenib were enrolled in this study. The outcomes of patients treated with apatinib were compared with those of patients who received supportive care. The primary endpoint was overall survival (OS).

Results:

A total of 92 patients with sorafenib-resistant advanced HCC (84 men and 8 women; mean age, 51.9 years) were included. All patients had an etiology of hepatitis B. The median OS in the overall cohort was 5.0 months [95% confidence interval (CI): 3.9, 6.0]. Of 92 patients, 58 (63.0%) were treated with apatinib, and 34 (37.0%) received supportive care. Apatinib treatment was associated with longer survival times than supportive care for patients with sorafenib-resistant advanced HCC (median OS: 7.0 versus 4.0 months, p < 0.001). The results of the multivariate analysis demonstrated that liver tumor load [hazard ratio (HR): 3.653, 95% CI: 2.047, 5.965, p < 0.001] and extrahepatic spread (HR: 0.303, 95% CI: 0.231, 0.778, p = 0.003) were independent predictors of OS after apatinib treatment.

Conclusion:

This study showed that subsequent apatinib treatment may improve survival outcomes compared with supportive care for patients with sorafenib-resistant, advanced hepatitis B virus (HBV)-related HCC, especially for patients who have a lower liver tumor load and extrahepatic spread.
Causes, Effects, and Forms of Factionalism in Southeast Asia
Authors: Chambers Paul , Ufen Andreas
Published: July 2020

This paper is the introduction for a special issue which examines intra-party factions and factionalism in competitive party systems of Southeast Asia, looking at the cases of Cambodia, Indonesia, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Timor-Leste, in that order and rounding up with a comparative conclusion. The study centres primarily upon one query: in competitive party systems of Southeast Asia, what accounts for the rise of factionalism in some party systems relative to others? The paper at hand frames this special issue, reviewing the literature and examining the causes, effects and forms of factionalism in general and more specifically in Southeast Asia.
A Review of Current Management of Knee Hemarthrosis in the Non-Hemophilic Population
Authors: Potpally Nikhil , Rodeo Scott , So Paul , Mautner Ken , Baria Michael , Malanga Gerard A
Published: July 2020

The knee joint is one of the most frequently injured joints in the body, and the resulting injury may often lead to the presence of a bloody effusion, or hemarthrosis. The acute management of this condition can have long-lasting implications, and may ultimately result in the early onset of osteoarthritis in this population. Heme, a breakdown product of erythrocytes, and associated pro-inflammatory mediators, are known to have deleterious interactions with cartilage and synovium. The presence of blood in a joint following injury can precipitate these effects and accelerate the degenerative changes in the joint. Currently, there is no consensus on the optimal management of a traumatic knee joint injury with a hemarthrosis. Nontraumatic hemarthosis, seen most commonly in hemophilia patients, has a set of established guidelines that does not routinely recommend drainage of the joint. This article presents a rationale for joint aspiration to minimize the harmful effects of blood following traumatic hemarthrosis.
Norm diffusion as a tool to uphold and promote EU values and interests: A case study on the EU Japan Mutual Legal Assistance Agreement
Authors: Weyembergh Anne , Wieczorek Irene
Published: July 2020

The article takes the European Union (EU)-Japan Mutual Legal Assistance (MLA) Agreement as a case study to analyse the EU success in pursuing its art 3(5) TEU mandate of upholding and promoting its values and interests; and to what extent the EU effectively relied on norm diffusion to this aim. The EU has arguably been, at least partially, successful in exporting its legal standards on ‘improved judicial cooperation’ in the text of the Agreement, especially a legal basis for acquiring testimony via videoconference, whereby to uphold its interest into security; and in including clauses allowing it to uphold its values of respect of fundamental rights. In particular, in having clause allowing the EU to refuse assistance if death penalty is involved, the EU arguably not only acted as a norm exporter, but it also set a new international legal standard, through which it also hoped to promote its values by triggering a change in Japan’s retentionist policy. An analysis of 10 years of implementation of the Agreement shows, however, a more nuanced picture, highlighting the importance to look at both the norm emergence and the norm socialisation phase when assessing the success of the EU as a norm exporter. The institutionalisation of EU-Japan MLA cooperation through the conclusion of the agreement has triggered a stark increase in volume and speed of cases, contributing to higher security. However, legal, practical and cultural factors hinder the implementation in practice of EU legal standards on acquisition of evidence and the promotion of the EU abolitionist agenda.