bluuebunny/crossref_metadata_2025 huggingface dataset:
A Geometric Model for Tolerance Analysis with Manufacturing Signature and Operating Conditions
Authors: Polini Wilma , Corrado Andrea
Published: June 2019

In this work, a geometric model for tolerance analysis has been carried out. Geometric reasoning has been implemented in the model to simulate the manufacturing process and, then, the assembly sequence. The proposed geometric model has been applied to a case study consisting of two circular profiles due to the turning process, and a hollow rectangular box. The two circular profiles have been assembled inside the box by considering the gravity, and the friction among the parts and the actual points of contact with and without using the manufacturing signature. Matlab® software has been used to implement the geometric model for tolerance analysis. The results have been compared with those obtained by using a literature model with and without considering the manufacturing signature. This work aims to be a first step towards the integration of the design and the manufacturing in a concurrent engineering approach.
Design and Feasibility Test of an Indigenous Motorized Wheel for Manual Wheelchair
Authors: Avutu Sateesh Reddy , Paul Sudip , Bhatia Dinesh
Published: June 2019

The wheelchair is essential for people with either spinal injury, limb injury, or trauma patients. The need at present is to customize the wheelchair based on the requirements of the disabled person. The maintenance and customization of a manual wheelchair is both simple and cost-effective when compared to powered wheelchairs, which are expensive and difficult to maintain in the long run. Accordingly, in this article, an attempt has been made to bring the facilities available in a powered wheelchair into the manual wheelchair, making it affordable to common people. Feasibility of a distinct manual wheelchair rear wheel rim is examined for various hub motor weights. The rear wheel of the manual wheelchair was replaced with an in-wheel direct drive hub-motor system. The proposed wheel model was designed using CATIA – V5 and an analysis was done using ANSYS software. A structural analysis was carried out to check the reliability and durability of the proposed wheel for different materials by changing hub-motor weights at various loading conditions. The nature of vibrations with respect to natural mode frequencies are found through modal analysis. Finally, the dynamic behavior of the proposed motorized wheel was examined using harmonic response analysis. Simulation results show the robustness of the proposed design and viability for real-time implementation.
Examining the Diffuse Reflectance Spectra and the Radiation Stability for the Mixtures of BaSO4 Micropowders and SiO2 Nanopowders with Various Specific Surface Area
Authors: Mikhailov Mikhail M. , Yuryev Semyon A. , Lapin Alexey N.
Published: June 2019

The paper is devoted to studying the effect of the specific surface area (SSA) of SiO2nanopowders (3 wt.%) added to BaSO4powders of a micron size on grain size distribution and diffuse reflectance spectra (ρλ) within the UV, visible, and near IR regions. Additionally, the authors have examined the spectra alteration (Δρλ) after irradiating with electrons (E=30 KeV). It has been established that mere mixing of the powders at a low concentration of nanoparticles leads to the post-irradiation decrease in the reflective power and to the subsequent increase in the reflectance coefficient stability.
Analysis of Phthalate Ester Content in Polyvinylchloride Construction Plastics by RAMAN Spectroscopy
Authors: Zakharenko Alexander Mikhailovich , Golokhvast Kirill Sergeevich
Published: June 2019

There is serious concern that fat-soluble phthalates such as di (2-ethylhexyl) phthalate, or DEPH. Phthalates are not chemically bonded to the PVC and will with time escape by evaporation or by extraction when in contact with liquids. Raman spectroscopy excited with a 785 nm laser can be used to determine the content of plasticizers in commercial flexible polyvinyl chloride (PVC) construction plastics. This method is very convenient for rapid non-destructive remote determination of phthalates, such as for quality control of production lines, quality control or at customs.
Chaotic Potential on the Degenerated Semiconductor Surface
Authors: Bondarenko Vyacheslav B. , Davydov Sergey N. , Nacke Bernard , Filimonov Alexey V.
Published: June 2019

In this paper, natural heterogeneities of the potential on the degenerated semiconductor surface are discussed as well as the barrier height fluctuations in metal-semiconductor contacts. In the case of electroactive dopant linear screening, characteristic values of chaotic potential amplitudes have been defined. The dependence is shown of these heterogeneities on semiconductor electrophysical parameters.
Influence of Etching Regimes on the Reflectance of Black Silicon Films Formed by Ni-Assisted Chemical Etching
Authors: Volovlikova Olga V. , Gavrilov S.A. , Lazarenko P.I. , Kukin A.V. , Dudin A.A. , Tarhanov A.K.
Published: June 2019

This paper examines the influence of etching regimes on the reflectance of black silicon formed by Ni-assisted chemical etching. Black silicon exhibits properties of high light absorptance. The measured minimum values of the reflectance (R-min) of black silicon with thickness of 580 nm formed by metal-assisted chemical etching (MACE) for 60 minutes at 460 lx illumination were 2,3% in the UV region (200–400 nm), 0,5% in the visible region (400–750 nm) and 0,3% in the IR region (750–1300 nm). The findings showed that the reflectance of black silicon depends on its thickness, illumination and treatment duration. In addition, the porosity and refractive index were calculated.
Solid State of Polymolybdenum(VI) Phenylsiloxanes - Synthesis and Structure
Authors: Shapkin Nikolai P. , Kapustina Alevtina , Dombai Natalya , Libanov Vitalii , Khal'chenko Irina G. , Gardionov Sergei , Gribova Victoria
Published: June 2019

Interaction of molybdenyl(VI) bis(acetylacetonate) with polyphenylsiloxane in xylene and under mechanochemical activation conditions has been investigated. The interaction of the above reagents under mechanical activation conditions proceeds with formation of soluble polymers similar to those obtained in a solution with the silicon/molybdenum ratio equal to 2.6. The crystal chemistry parameters of the fraction obtained in solution with the ratio Si/Mo = 1:2 have been calculated on the basis of the X-ray diffraction analysis data using the Debye–Shearer equation. It has been demonstrated that the chain cross-section found using the Miller–Boyer method coincides with that calculated geometrically on the basis of literature data on bond lengths and angles.
Research of Heat Power in Friction Stir Spot Welding
Authors: Statsenko V. , Sukhorada A.
Published: June 2019

Nowadays the most perspective, high-tech and productive process is friction stir spot welding. The most important part of this technology is to determine the temperature of the material in the stir zone. This parameter is easily counted by the amount of the heat input, put in the welding zone. We made experimental researches about the relation of the heat power, therotation speed and the diameter of the working tool. For that purpose an experimental scheme was chosen, which models a welding material (aluminum alloy AMg5) as an experimental tube 20 mm in diameter. The tool (shear steel P6M5) is modeled as a working plate. Measurements of the frictional moments depending on the rotation speed of the experimental working tube during the constant temperature are made on the prepared stand. By the experimental data the specific heat input and the heat power were counted on every concentric ring, 2 mm in width, in the end of the working tool, 20 mm in diameter. Also, the sum of the heat power for the whole tool during various rotation speed terms was counted too. On the stand throughout the experiment were determined all the thermal conductivity heat losses along the rod, which the experimental tube was pinned on, all the working plate heat losses through the gasket towards the working desk and the convection from the surface of the rotating experimental tube to the environment. According the data, any of these losses is from 3 to 10 percent. This is shown in the heat input counting.
Interactions between antidepressants, sleep aids and selected breast cancer therapy
Authors: Wedret Jody Jacobson , Tu Thanh G. , Paul Doru , Rousseau Camille , Bonta Augustin , Bota Robert G.
Published: June 2019

Depression and insomnia are very significant pathologies in cancer patients as they contribute to the patient’s overall cure and quality of life. Moreover, untreated depression and ongoing insomnia are associated with decreased immune responses and lower survival rates. With all disease states and especially with cancer, close attention to drug-drug interactions and the potential impact on the efficacy of therapy is paramount. One area of particular interest due to the lack of well-done clinical trials is drug-drug interaction(s) between antidepressants and cancer treatment. Pharmacokinetics of a certain drug allows for prediction of certain drug interactions based on chemical properties of the agents involved. If the agents depend on their metabolites for activity, active drug level will be decreased through this enzyme inhibition. In this paper, we looked at the cytochrome-P450 drug interactions between antidepressants and sleep aids with Selective Estrogen Receptor Modulators (SERM). Newer SERM metabolisms are less influenced by interactions with medications used to treat depression. However, tamoxifen metabolism could be severely altered by several antidepressants. This has direct consequences as patients on tamoxifen and antidepressant can have double the risk of relapse to cancer in two years. We discussed those interactions and made recommendations for clinical use.
Histological Evaluation of Patients with Chronic Nonbloody Large Bowel Diarrhea and Normal Colonoscopy
Authors: Karri Varun Kumar , Korrapati Sravan Kumar , Girinadh L. R. S.
Published: June 2019

Introduction: Chronic diarrhea is defined as the passage of soft or watery stool more than three times per day with or without blood and/or mucous or the passage of stool of more than 200 g per day and lasts for more than 4 weeks. Studies exploring the causes of chronic diarrhea in the developing countries are scarce and might not be generalizable from one setting to another. Aim: The aim of the study is to study the colonic and terminal ileal macroscopic and mucosal histopathological findings in chronic large bowel diarrhea patients. Methods: Eighty-six patients with chronic large bowel diarrhea were included after negative HIV status, stool analysis, and stool culture. A full-length colonoscopy with terminal ileoscopy was done. When the colon was within normal limits, randomly four biopsies each were taken from terminal ileum, ascending colon, transverse colon, and rectosigmoid region, respectively. Results: In a total of 86 patients, most of the patients (48%) were in the age group of 41–60 years. Females predominated in the present study in the ratio of 3:2. Ileal intubation was possible in all (100%) cases. Histology is normal in 35 patients. Fifty-one patients had histological changes of which 22 were diagnostic for specific disease which altered the treatment. Among 22 patients, 21 (95.4%) had histological changes in ascending colon and only 9 (40.9%) had changes in biopsy from rectosigmoid. In our study, definite diagnostic histology was obtained in 25.5% of cases. Conclusion: The yield of colonoscopy and biopsy in chronic large bowel diarrhea is moderate. Colonoscopy and biopsy have higher diagnostic yield than sigmoidoscopic biopsies.
Unique Pattern of True Foreign-Body Ingestion in the Valley of Kashmir; Sharp Foreign Bodies Outnumbering the Blunt Ones
Authors: Shah Nisar Ahmad , Kadla Showkat Ahmad , Shah Asif Iqbal , Khan Bilal Ahmad , Haq Inaam Ul , Shiekh Shabir Ahmad , Malik Aijaz Ahmad
Published: June 2019

Background and Aims: Foreign-body ingestion is a common phenomenon, especially in children. In normal adults, foreign-body ingestion is usually accidental and mostly ingestion occurs with food and impaction is a result of structural abnormalities of the upper gastrointestinal tract (UGIT). However, accidental ingestion of nonfood products is unusual; especially ingestion of pins (scarf or safety pins) and needles is unknown. We come across ingestion of these unusual/sharp foreign bodies routinely from the past few years. The aim of this study was to observe, over a period of 1 year, the spectrum of nonfood or true foreign-body ingestion in our community and to see the impact of an early endoscopy on outcome or retrieval of the ingested objects. Materials and Methods: In a prospective observational study, we studied the profile of foreign-body ingestion in normal individuals of all ages and both sexes, excluding the individuals with any structural abnormalities of the gut and the people with psychiatric ailment. Results: Of total 51 patients with foreign-body ingestion, 42 (82%) were 20 or <20 years of age with females constituting 86.3% of the total and males constituting only 13.7%. Foreign bodies ingested included 38 pins (74.5%), seven coins (13.7%), four needles (7.8%), and one denture and a nail (2%) each. Overall 26 (51%) foreign bodies were seen in UGIT (within reach of retrieval) at the time of endoscopy and all of them were retrieved. Nineteen (37.3%) patients reported within 6 h of ingestion, and majority of them (16 = 84.2%) had foreign bodies within UGIT and all of them were removed. Those patients (n = 32; 62.7%) who reported beyond 6 h, only 10 (31.25%) had foreign bodies in UGIT as a result of which the success rate of removal in these patients was only 32%. Conclusion: Most of our patients were young females and the common foreign bodies ingested were sharp including scarf pins followed by coins and needles. The success rate of retrieval was high in those who reported within 6 h of ingestion of foreign body. The rate of retrieval was 100% if foreign body was found on esophagogastroduodenoscopy. Hence, we recommend an early endoscopy in these patients and some alternative to use of scarf pins.
Arthroscopic reconstruction of the posterior cruciate ligament
Authors: Awad Allah Adel H. , Abdel Rahman Tharwat M. , Hashem Elsherief Faisal A. , Ragheb Abd Albaki Mohamed G.
Published: June 2019

Background

Posterior cruciate ligament (PCL) tears have historically been underdiagnosed because they are often asymptomatic. It now appears that PCL tears occur more frequently than has been previously appreciated. The PCL is named for its insertion on the tibia.

Objective

The aim of this study was to clarify when and how to go for arthroscopic reconstruction of the PCL, reviewing the latest arthroscopic techniques.

Patients and methods

This prospective study included 20 patients (17 males and three females). Their mean age was 48 years [48.23±10.53 (range 20–60) years]. All patients presented with PCL injury, whether isolated injury or combined with other ligamentous injury, closed knee injury, with no previous ligamentous reconstruction of PCL on the same side, and all being fit for surgery. Preoperative radiographs and MRI were done to establish PCL injury diagnosis together with the clinical evaluation.

Results

We found that PCL injury was found to be combined with other ligamentous injury rather than isolated (60% combined injury). We found satisfactory highly statistically significant difference between preoperative and postoperative results according to Lysholm Score. The mean preoperative total Lysholm Score was 24.77 in comparisons with the mean postoperative total Lysholm Score of 90.13. Clinical examination according to IKCD Score shows less significant difference in general. In contrast, comparison between preoperative and postoperative results according to posterior drawer test and total score shows highly significant difference (P<0.001).

Conclusion

In our study, we reached the concept that arthroscopic reconstruction of PCL injuries has low rate of complications, within 13.33%. Arthroscopic single-bundle reconstruction may be complicated with hardware complications, loss of motion, infection, and donor site morbidity.
Methylenetetrahydrofolate reductase C677T gene polymorphism and diabetic nephropathy susceptibility in patients with type 2 diabetes mellitus
Authors: Zidan Amena R. , El Mougy Hala M. , Moustafa Hasnaa S. , El attar Shahinaz , Mohamed Eman F.
Published: June 2019

Background

Type 2 diabetes mellitus (T2DM) is becoming increasingly prevalent throughout the world. Diabetic nephropathy (DN) is one of the most serious microvascular complications of diabetes mellitus. The C677T polymorphism of the methylenetetrahydrofolate reductase (MTHFR) gene has been reported to cause reduced MTHFR enzyme activity and impaired homocysteine metabolism, leading to hyperhomocysteinemia.

Aim

The aim of the study was to evaluate the role of MTHFR C677T gene polymorphism in the susceptibility to DN in type 2 diabetic patients.

Patients and methods

The study was conducted on 180 adult Egyptian participants (60 healthy controls, 60 patients with T2DM without nephropathy, and 60 patients with T2DM complicated with nephropathy). C677T genotypes were determined by PCR-RFLP analysis, and homocysteine levels were measured by enzyme-linked immunosorbent assay.

Results

The prevalence of polymorphic genotype of CT and TT and T allele was statistically significantly increased in diabetic patients than in controls (P<0.001). There was a statistically significant increase in polymorphic genotypes (CT and TT) and T allele in T2DM with nephropathy in comparison to T2DM without nephropathy group (P<0.001, 0.05, respectively). Serum homocysteine levels were significantly higher in patients with nephropathy than in patients without nephropathy or controls with P less than 0.001. The higher serum homocysteine level was observed with polymorphic genotypes TT and CT compared with CC genotypes (P<0.001).

Conclusion

The TT genotype and T allele of MTHFR C677T may represent a significant genetic molecular marker to predict the risk of DN in T2DM.
Diagnostic utility of flexible bronchoscopy in mediastinal and hilar lymphadenopathies
Authors: Farag Taghreed S. , Farag Abeer S.
Published: June 2019

Background

Mediastinal and/or hilar lymphadenopathy with or without parenchymal lesions are difficult in the diagnosis via noninvasive techniques.

Objective

To assess the role of flexible fiberoptic bronchoscopy (FOB), in particular, blind transbronchial needle aspiration (TBNA) in the diagnosis of mediastinal and/or hilar lymphadenopathies.

Patients and methods

A cross-sectional study was carried out on 42 out of 83 patients presented by chest radiography of hilar and/or mediastinal lymphadenopathies with or without parenchymal lesions. Contrast-enhanced computed tomography chest and FOB, TBNA, and bronchoalveolar lavage were done for all patients. Forceps biopsy and bronchial brushing were done for some patients with bronchoscopic airway abnormalities.

Results

A total of 52 patients underwent FOB procedures; among them 10 (19.2%) patients were excluded due to nonconclusive diagnosis for further evaluations; final histopathological and/or microbiological diagnosis was confirmed in 42 (80.8%) patients, and they were included in data analysis. Among them, 25 (59.5%) patients had malignant lymphadenopathies (five patients had small cell lung cancer, 18 patients had nonsmall cell lung cancer, and two patients had lymphoma) and 17 (40.5%) had benign lymphadenopathies (eight patients had sarcoidosis, three patients had tuberculosis, six patients had reactive lymphadenitis). The overall sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy of TBNA in the diagnosis of intrathoracic lymphadenopathies were 75.00, 54.50, 60.00, 70.60, and 64.29%, respectively.

Conclusion

Bronchoscopy with TBNA has good sensitivity and negative predictive value with fair specificity and positive predictive value in the diagnosis of intrathoracic lymphadenopathies. TBNA is a safe, effective procedure and can be performed easily during routine diagnostic bronchoscopy, and minimize the requirement for mediastinoscopy and thoracotomy.
Comparison of the Use of Serum and Plasma as Matrix Specimens in a Widely Used Noncommercial Dengue IgG ELISA
Authors: Deza-Cruz Iñaki , Mill Aileen , Rushton Steven , Kelly Patrick
Published: June 2019

Although sera are most commonly used in serological diagnostic tests for dengue, sometimes only plasma containing ethylenediaminetetraacetic acid (EDTA) may be available. When we studied the performance of a widely used noncommercial dengue ELISA in the detection of reactive IgG in sera and plasma from the same individuals, we found no significant differences in the diagnostic performance of the assay. The inter-specimen coefficient of variation (CV) of the optical density was 0.081 and the concordance correlation coefficient (CCC) was 0.92, showing a very strong agreement between the two matrix specimens. The intra-specimen CV and CCC were higher for plasma than for serum at low dilutions, but similar at high dilutions. Overall, our results show that the performance of a widely used in-house ELISA using plasma containing EDTA is equivalent to serum with the recommendation to assay the plasma specimens in duplicate to reduce variability of results at lower dilutions.
Analysis and Automated Detection of Ice Crystal Icing Conditions Using Geostationary Satellite Datasets and In Situ Ice Water Content Measurements
Authors: Bedka Kristopher , Yost Christopher , Nguyen Louis , Strapp J. Walter , Ratvasky Thomas , Khlopenkov Konstantin , Scarino Benjamin , Bhatt Rajendra , Spangenberg Douglas , Palikonda Rabindra
Published: June 2019

Recent studies have found that high mass concentrations of ice particles in regions of deep convective storms can adversely impact aircraft engine and air probe (e.g. pitot tube and air temperature) performance. Radar reflectivity in these regions suggests that they are safe for aircraft penetration, yet high ice water content (HIWC) is still encountered. The aviation weather community seeks additional remote sensing methods for delineating where ice particle (or crystal) icing conditions are likely to occur, including products derived from geostationary (GEO) satellite imagery that is now available in near-real time at increasingly high spatio-temporal detail from the global GEO satellite constellation. A recent study using a large sample of co-located GEO satellite and in-situ isokinetic evaporator probe (IKP-2) total water content (TWC) datasets found that optically thick clouds with tops near to or above the tropopause in close proximity (≤ 40 km) to convective updrafts were most likely to contain high TWC (TWC ≥ 1 g m-3). These parameters are detected using automated algorithms and combined to generate a HIWC probability (PHIWC) product at the NASA Langley Research Center (LaRC). Seven NASA DC-8 aircraft flights were conducted in August 2018 over the Gulf of Mexico and the tropical Pacific Ocean during the HIWC Radar II field campaign. The convection sampled during four flights was observed by GOES-16 at 1- or 5-minute intervals, providing the first opportunity to analyze product performance from this new satellite. This paper will (1) present initial comparisons between GOES-16 and IKP-2 datasets during HIWC Radar II, (2) demonstrate GOES-16 products for select periods when high TWC was encountered with an emphasis on three flights with 1-minute imagery, (3) compare GOES observations and derived products from the HIWC Radar I and II campaigns.
Frostwing Co-Operation in Aircraft Icing Research
Authors: Koivisto Pekka , Soinne Erkki , Broeren Andy , Bond Thomas
Published: June 2019

The aerodynamic effects of Cold Soaked Fuel Frost have become increasingly significant as airworthiness authorities have been asked to allow it during aircraft take-off. The Federal Aviation Administration and the Finnish Transport Safety Agency signed a Research Agreement in aircraft icing research in 2015 and started a research co-operation in frost formation studies, computational fluid dynamics for ground de/anti-icing fluids, and de/anti-icing fluids aerodynamic characteristics. The main effort has been so far on the formation and aerodynamic effects of CSFF. To investigate the effects, a generic high-lift common research wind tunnel model and DLR-F15 airfoil, representing the wing of a modern jet aircraft, was built including a wing tank cooling system. Real frost was generated on the wing in a wind tunnel test section and the frost thickness was measured with an Elcometer gauge. Frost surface geometry was measured with laser scanning and photogrammetry. The aerodynamic effect of the frost was studied in a simulated aircraft take-off sequence, in which the speed was accelerated to a typical rotation speed and the wing model was then rotated to an angle of attack used at initial climb. Time histories of the lift coefficient were measured with a force balance. The experiments showed that depending on the ambient temperature the frost may evaporate/melt during the take-off sequence. Lift losses after rotation with CSFF contamination at ambient temperatures of 4° to 7°C above freezing point were measured to be 4 to 5 % for roughness values, k/c, below 10-3. For comparison, lift loss tests with typical anti-icing fluids were performed resulting to roughly equal lift losses. This paper gives an overview of the performed activities.
An Assessment of LEWICE Roughness and Convection Enhancement Models
Authors: Shannon Timothy , McClain Stephen T.
Published: June 2019

During aircraft design and certification, in-flight ice accretions are simulated using ice prediction codes. LEWICE, the ice accretion prediction code developed by NASA, employs a time-stepping procedure coupled with a thermodynamic model to calculate the location, size and shape of an ice accretion. LEWICE has been extensively validated for a wide range of icing conditions. However, continuing improvements to LEWICE predictive capabilities require better understandings of 1) the fundamental physics of turbulent flow generated by ice accretion roughness during an icing event and 2) the mechanisms responsible for convective enhancement of real ice accretion roughness. Recent experiments in the Icing Research Tunnel (IRT) at NASA Glenn Research Center have enabled significant insights into the nature of ice accretion roughness spatial and temporal variations. Other recent investigations have employed scans from the IRT to generate scaled test surfaces to investigate convection enhancement and skin friction interactions of flow over the surfaces with real ice roughness. For this investigation, the measurements of ice roughness characteristics, skin friction, and convection heat transfer enhancement are compared directly to predictions calculated using the LEWICE models. Issues associated with the LEWICE model for predicting laminar-to-turbulent transition are also addressed. The comparisons show that while the LEWICE models significantly overestimate equivalent sand-grain roughness heights and the local skin friction, the resulting LEWICE predictions of convection heat transfer generally agree within 25% of the experimental values for surfaces constructed with low thermal conductivity materials. At each step of the LEWICE model, methods to improve the predictions are provided.
Uncertainty of the Ice Particles Median Mass Diameters Retrieved from the HAIC-HIWC Dataset: A Study of the Influence of the Mass Retrieval Method
Authors: Coutris Pierre , Schwarzenboeck Alfons , Leroy Delphine , Grandin Alice , Dezitter Fabien , Strapp J. Walter
Published: June 2019

In response to the ice crystal icing hazard identified twenty years ago, aviation industry, regulation authorities, and research centers joined forces into the HAIC-HIWC international collaboration launched in 2012. Two flight campaigns were conducted in the high ice water content areas of tropical mesoscale convective systems in order to characterize this environment conducive to ice crystal icing. Statistics on cloud microphysical properties, such as Ice Water Content (IWC) or Mass Median Diameter (MMD), derived from the dataset of in situ measurements are now being used to support icing certification rulemaking and anti-icing systems design (engine and air data probe) activities. This technical paper focuses on methodological aspects of the derivation of MMD. MMD are estimated from PSD and IWC using a multistep process in which the mass retrieval method is a critical step. Complementary to previous studies reporting on MMD values calculated from the HAIC-HIWC dataset, this paper deals with the uncertainty in MMD by comparing two different approaches for the retrieval of the mass-size (m-D) relationship. The analysis encompasses the data collected in the high IWC areas (IWC > 1g.m-3) sampled during the two HAIC-HIWC field campaigns. MMD series are computed using three different mass-size relationships and statistical values are compared. Overall, MMD values are in good agreement, at least for two methods although they imply quite different assumptions. On the variability in MMD values at a given temperature level, results show that MMD may vary significantly from one flight to the other, even though MMD series produced with the different mass retrieval methods follow a similar pattern. A strong temperature dependence is observed regardless the assumption on the m-D relationship, making MMD to increase by more than a factor of 2 as temperature increases from -50°C to -10°C. Finally, the influence on calculated MMD of two different definitions for particle size (Deq and Dmax) is demonstrated. Generally, MMD computed with Dmax are a few percent larger as compared to MMD calculated from Deq definition, supporting the conclusions from previous studies.
Additional Comparison of Iced Aerodynamic Measurements on a Swept Wing from Two Wind Tunnels
Authors: Lee Sam , Broeren Andy , Woodard Brian , Lum Christopher , Smith Timothy
Published: June 2019

Artificial ice shapes of various geometric fidelity were tested on a wing model based on the Common Research Model. Low Reynolds number tests were conducted at Wichita State University’s Walter H. Beech Memorial Wind Tunnel utilizing an 8.9% scale model, and high Reynolds number tests were conducted at ONERA’s F1 wind tunnel utilizing a 13.3% scale model. Several identical geometrically-scaled ice shapes were tested at both facilities, and the results were compared at overlapping Reynolds and Mach numbers. This was to ensure that the results and trends observed at low Reynolds number could be applied and continued to high, near-flight Reynolds number. The data from Wichita State University and ONERA F1 agreed well at matched Reynolds and Mach numbers. The lift and pitching moment curves agreed very well for most configurations. This confirmed results from previous tests with other ice shapes that indicated the data from the low Reynolds number tests could be used to understand iced-swept-wing aerodynamics at high Reynolds number. This allows ice aerodynamics testing to be performed at low Reynolds number facilities with much lower operating costs and generate results that are applicable to flight Reynolds number.
Testing of Elastomer Icephobic Coatings in the AIWT: Lessons Learned
Authors: Orchard David , Chevrette Gislain , Maillard Damien , Khoun Lolei
Published: June 2019

A study has been conducted into icephobic properties of some highly durable “off-the-shelf” elastomer materials using a rotating ice adhesion test rig installed in the NRC’s Altitude Icing Wind Tunnel. This enabled the formation of ice at environmental conditions similar to those experienced during in-flight icing encounters. Initially, the tests indicated some very positive results with ice adhesion shear stress as low as 8KPa. On further examination, however, it became apparent that the test preparation process, in which the samples were cleaned with an ethanol alcohol solution, influenced the results due to absorption and prolonged retention of the cleaning fluid. The uptake of the ethanol alcohol solution by the elastomer was found to be a function of the surface temperature and remained absorbed into the coating during the ice accretion process changing the characteristics of the coating in such a way that led to a reduction in the ice/surface bond strength.
Finite Element Analysis of Chassis Integrated Structure for Tractor Trolley in Agricultural Applications
Authors: Deulgaonkar Vikas Radhakrishna
Published: June 2019

This paper deals with the design evaluation of chassis integrated structure intended to carry tractor trolleys. This structure is either bolted along with tractor trailer chassis or attached to the trolley using special attachments. Such structure is located in between the trolley chassis and tractor trolley. The role of this structure is to provide a support to the trolley during transportation in agricultural terrains. This structure transmits and upholds the load variations during tractor travel in agricultural terrains. Present work deals with design evaluation of one such structure. In this work, the structure under consideration is designed to house and support one axle semi-trailer trolley. Locations of attachment of the structure to the chassis or trolley depend upon the weight and size restrictions mentioned in Indian Standards. Major design considerations for the structure include height of the semi-trailer trolley, nature of load or cargo placed inside the trolley, restrictions on axle load and tractor geometry parameters as departure angle and ground clearance. In order to evaluate structure characteristics of stress and deflection computer simulation is carried for the road-load conditions. Road profiles for structure simulation and analysis include typical Indian agricultural terrains comprising of black cotton soil and soil lumps
Geometric Design Validation of Oxidation Catalysis System in Composite Regeneration Emission Control System
Authors: Kurien Caneon , Srivastava Ajay Kumar , Kumar Deepak
Published: June 2019

Development of emission control systems for reducing the toxicity levels of exhaust emissions is one of the major challenges faced by automotive industry which rely on diesel engines owing to its thermal efficiency and service life. The major challenge faced for implementation of emission control system is the periodic regeneration of channels in diesel particulate filter to avoid clogging and backpressure rise inside the substrate. Commercial fuel based regeneration is leading to uncontrolled combustion inside the filter substrate affecting its service life. State of art of the emission control system has been detailed by conducting literature survey on the area and it has been found that these systems have a vital role in reducing emission levels to meet emission norms. Microwave based active regeneration has been proposed in this paper to improve the service life and effectiveness of diesel particulate filter. Three dimensional models of the axial flow, radial flow and cylindrical oxidation catalysis system are developed using Computer Aided Design software and flow analysis has been conducted using Computational Fluid Dynamics software (ANSYS FLUENT). Validation of the geometric design is done using simulation results and the pressure drop across the system is found to be in acceptable range.
Computational Analysis of Air Wings to Evaluate Downforce and Lift-Drag Ratio: Technical Note
Authors: Nachippan N. Murugu
Published: June 2019

Air wings with NACA air foil profiles are designed and analysed for their aerodynamics at 40m/s. More than one air profile has been analysed to find the suitable air wing meeting the requirement and efficiency. An air wing in an automobile experiences aerodynamic forces and act as an inverted air foil. The efficiency of an air wing can be determined by down force - drag ratio i.e., it has to produce more down force with least possible drag caused by its frontal area of cross section.
Analysis of Machining Parameters in Turning Operation on Duplex 2205 by using RSM for Vehicle Structure
Authors: Vijayan V. , Sureshkumar B. , Sathishkumar G. , Yokeshwaran R.
Published: June 2019

Turning is the machining process carried out to make cylindrical parts. Since the process is economical and the flexibility of turning operation is high, the process has become highly versatile among the industrial scenario. The design of experiments concept along with response surface methodology is used to analyze the machining parameters such as spindle seed, feed rate and depth of cut, of the turning operation. Three levels of spindle speed, feed rate and depth of cut are used as input parameters and their corresponding responses such as material removal rate (M.R.R), surface roughness, feed force, thrust force and cutting force are considered as the output parameters. The main aim of this experimentation process is to identify the optimal process parameters to get high M R R and low surface roughness. During high spindle speed, the M R R is high and vice versa. Surface roughness is high when its corresponding spindle speed and depth of cut is high. A high spindle speed, the chip formation is continuous whereas in medium speed, discontinuous chip is formed. M.R.R is high when spindle speed, depth of cut and feed rate are high.
Indicadores de desempenho diferenciam empresas do mesmo segmento?
Authors: Marquezan Luiz Henrique Figueira , Rossato Marivane Vestena , Ely Bernardo Cohen , Fogaça Tiago Ribas
Published: June 2019

O objetivo deste estudo foi identificar a capacidade dos indicadores de rentabilidade e lucratividade em produzir subsídios para analistas e investidores, por meio da diferenciação das empresas de um mesmo segmento de atuação. Tal abordagem segue a linha contingencial. Para isso, foram analisadas 17 empresas do segmento de edificações da B3, em 22 trimestres. Os dados, secundários, foram coletados do website da B3, adotando-se os indicadores: ROA, Margem Bruta, Margem EBITDA e Margem Líquida. Os dados foram analisados por meio de estatística descritiva e Teste de Kruskal Wallis, com o procedimento de comparações múltiplas. Os resultados possibilitaram avaliar cada indicador e empresa, identificando os que mais as diferenciam. Concluiu-se que os quatro indicadores apresentam diferenças estatisticamente significativas entre as empresas, porém em índices menores a 40% das comparações possíveis. Assim, o uso de técnicas estatísticas contribui para a identificação sobre variações significativas de desempenho entre as companhias, bem como demonstra as semelhanças em um mesmo setor econômico e pode contribuir no julgamento de analistas e investidores. O estudo discute tais impactos e a relevância desse tipo de análise por eles.
Impacto do reconhecimento de instrumentos financeiros mensurados a valor justo sobre a volatilidade do resultado
Authors: Figueira Laís Manfiolli , Ambrozini Marcelo Augusto
Published: June 2019

Visando verificar se o reconhecimento de instrumentos financeiros mensurados a valor justo no resultado levou a uma maior volatilidade dos lucros contábeis, adotou-se testes estatísticos que analisaram a diferença entre as variâncias dos lucros líquidos que consideram instrumentos financeiros avaliados a valor justo e a custo histórico amortizado, no período entre 2010 e 2016, das empresas brasileiras de capital aberto não financeiras e Bancos com maior Presença em Bolsa. Após analisar o efeito sobre o lucro líquido dos ganhos e perdas não realizados de instrumentos financeiros, constatou-se uma tendência a suavização, tanto para as empresas não-financeiras quanto para os Bancos, e não de aumento da volatilidade como argumentado pelos críticos a adoção do valor justo. Essa tendência pode apresentar um impacto positivo na avaliação dessas empresas pelo mercado de capitais e por credores, já que apresentam uma preferência por lucros consistentes ao longo do tempo, devido a sua aversão ao risco.
As mulheres entre a libertação e a renovação na obra lacerdiana
Authors: Lessa Patricia , Lamosa Paes Ana Carolina
Published: June 2019

Resenha do livro:MOURA, Maria Lacerda de. Renovação. Edição Fac-Simile, Org.: Adelaide Gonçalves, Allyson Buno, Camila Queiroz. Fortaleza: Edições UFC, 2015.
A dança e as pessoas com deficiência visual: Uma análise de vinte anos de produção acadêmica brasileira
Authors: Albarran Patricia Andrea Osandon , Silva Daniele Nunes Henrique , Da Cruz Eva Aparecida Pereira Seabra
Published: June 2019

Este artigo tem como objetivo fazer uma revisão bibliográfica de trabalhos publicados em congressos acadêmicos, artigos, dissertações e teses no idioma português publicados e realizados no Brasil, entre os anos 1996 e 2016, sobre o papel da dança na vida da pessoa cega ou com baixa visão. Como resultados da análise realizada a respeito da bibliografia pesquisada, verificou-se que a dança, enquanto arte e enquanto atividade que coloca em evidência o movimento e o contato do(a) dançarino(a) com outras pessoas e com o mundo, promove o desenvolvimento de habilidades motoras, espaciais e de locomoção para a pessoa com deficiência visual, além de contribuir para o desenvolvimento de aspectos sociais, psíquicos e do aumento da autoestima. Além desses benefícios, inferidos em muitos dos trabalhos analisados, também se verificou a possibilidade de profissionalização dos(as) bailarinos(as) cegos(as) ou com baixa visão, indicando a centralidade da dança para a inclusão social da pessoa com deficiência visual.
Presentación: género en la psicología en tiempos sombríos
Authors: Lago Mara Coelho de Souza , Uziel Anna Paula , Salvaro Giovana Ilka Jacinto , E Silva Patricia Castro de Oliveira
Published: June 2019

Apresentação: gênero na psicologia em tempos sombrios
Por uma Psicologia Social morena: contribuições do pensamento de Darcy Ribeiro
Authors: Costa Pedro Henrique Antunes da , Paiva Fernando Santana de
Published: June 2019

O presente artigo objetiva sistematizar contribuições do pensamento de Darcy Ribeiro para a Psicologia Social brasileira, enfocando o livro “O Povo Brasileiro: A formação e o sentido do Brasil”. O trabalho encontra-se estruturado em três partes: uma apresentação do pensamento e percurso acadêmico-político de Darcy; seus aportes para a Psicologia Social brasileira; uma contextualização sobre Psicologia Social e direcionamentos para o prolongamento deste diálogo. As contribuições do pensamento de Darcy para a Psicologia Social brasileira são: O resgate da dimensão histórica na análise dos sujeitos e realidade brasileira; o caráter dialético dessa realidade; e a transformação social como horizonte ético-político. Pensar numa Psicologia Social brasileira, ou uma ‘Psicologia Social morena’, inspirados no socialismo moreno de Darcy, implica a superação de sua ninguendade, por meio da aceitação de sua brasilidade. Uma Psicologia Social brasileira que volte-se para si, vivendo seu próprio projeto intelectual-prático e rompa com a miséria de dependência colonial.
Deborah Britzman e a educação sexual: entre a pedagogia queer e a psicanálise
Authors: Rodrigues Gelberton Vieira , Porchat Patricia
Published: June 2019

Ao articular os estudos queer com a psicanálise e com a educação, encontramos a teoria de Deborah Britzman na construção de uma educação sexual que não esteja associada com a previsibilidade e com a estabilidade. Para compreender a pedagogia queer como um campo pedagógico que subverte o discurso ideal da educação, apresentamos os estudos queer e seus pressupostos epistemológicos. Coloca-se em xeque a estabilidade das identidades e dos saberes, através da recusa intencional da identidade normalizada que produz anormalidades. Questiona-se o porquê e o quê ensinar, as “normalidades inquestionáveis” que estão associadas aos conteúdos, métodos, hierarquias e identidades escolares. A proposta pedagógica de Britzman apostará na arte, na literatura, nos jogos, nos filmes, nas brincadeiras, nos depoimentos em primeira pessoa, nas músicas e nas conversas livres e não-hierárquicas. Sugere-se que esta pode ser uma metodologia profícua para o a superação das resistências à criatividade e à educação sexual.
Há Psicologias em movimento? Problematizações (im)pertinentes nada inocentes sobre os prazeres, as sexualidades e os gêneros na formação em Psicologia.
Authors: Barreto Danielle Jardim , Peres Wiliam Siqueira , Sales Adriana Barbosa
Published: June 2019

Esta pesquisa se enunciou a partir de questionamentos acerca dos constantes embates vivenciados em sala de aula ao trazermos a temática de outras sexualidades, outros prazeres e de outras expressões de gênero, dissidentes dos modelos identitários heteronormativos, em nosso cotidiano universitário. Destes tensos encontros, anunciaram-se indagações como: - Que Psicologias estamos ensinando? - Que psicólog@s estão se formando atualmente? E mais uma indagação ainda: - Há uma identidade psi? As cartografias anunciadas destacam o necessário agenciamento de novos contratos éticos - estéticos e políticos nos territórios da formação em Psicologia, para a produção de outras Psicologias e que produzam outr@s modos de estar psicólog@s, através de desterritorizalizações das teorias tradicionais e de procedimentos de mensuração das vidas, com claras e pouco ingênuas, intenções de desconstrução das estratégias enrijecidas construídas e validadas pelas Psicologias de pastoreio, em prol da emancipação das experimentações dos corpos nas práticas sexuais, afetivas políticas e éticas de Psicologias.
Camponesas em lutas pelo fim da violência contra as mulheres e pela produção de outras formas de existência
Authors: Salvaro Giovana Ilka Jacinto
Published: June 2019

O presente trabalho apresenta reflexões iniciais sobre a emergência de lutas pelo fim da violência contra as mulheres, empreendidas pelo Movimento de Mulheres Camponesas do Brasil (MMC Brasil). O MMC emerge como um movimento social rural nacional constituído no ano de 2004 pela unificação de movimentos rurais autônomos de mulheres, com demandas e reivindicações por reconhecimento profissional, igualdade de gênero, defesa da vida, garantia e direitos, entre outras. A partir do diálogo com estudos realizados sobre movimentos rurais autônomos de mulheres e o MMC em diferentes regiões do Brasil, da análise de publicações e de discussões relacionadas ao 1º Encontro Nacional do Movimento de Mulheres Camponesas, realizado no ano de 2013, é possível observar que as demandas expressas e que mobilizam ações de enfrentamento envolvem situações de violência sofridas por mulheres no contexto doméstico, assim como denunciam desigualdades de gênero que regulam/controlam existências individuais e coletivas nas esferas privada e pública.
Pedagogias queer e polifonias do sul: transgressões e afecções na educação nos professores
Authors: Ramallo Francisco , Gómez Juan Ariel , Porta Luis
Published: June 2019

Baseado em sentidos imediatos e polifônicos, exploramos neste artigo a gestação de pedagogias queer, em um exercício que visa traçar sua relevância para a educação no corpo docente. Para isso, nos detemos nos diálogos que essas pedagogias estabelecem com as perspectivas decoloniais da educação, como forma de habitar esse projeto político do sul. Entre repetições respeitosas e irreverentes, coletamos diferentes genealogias e recepções locais que são direcionadas para mapear essas pedagogias. Por fim, afirmamos - sem nenhum critério exaustivo ou padronizador - uma série de transgressões oportunas para a formação do corpo docente, da comunidade acadêmica que compomos, como forma de visualizar gestos e horizontes queerizadores.