An Examination and Analysis of a Learner’s Errors from the Perspective of a Pedagogical Grammar

Attitudes towards errors in language learning are changing as a result of recent contributions coming from the field of pedagogical grammar, which take into consideration notions of error analysis, contrastive analysis and the study of interlanguage. Errors, we argue, should be considered as opportunities to develop learners’ language awareness to further their learning, and as instances for teachers to design more effective remedial work. Through the analysis of a learner’s written assignment, Corder’s (1967a) model of errors analysis is applied in order to identify errors leading to develop an understanding of the reasons behind the occurrence of inconsistencies produced by a speaker of Arabic learning English as a foreign language. Whilst the results point to prevalent negative interferences between the two languages, the main outcome of the study is centred on the value of errors as opportunities for both learners and instructors and on the salient role of feedback

Effect of Composition on Optical and Thermoelectric Properties of Microstructured p-type (Bi2Te3)x(Sb2Te3)1 – x Alloys

Semiconducting (Bi2Te3)x(Sb2Te3)1 – x alloys are among the best thermoelectric materials available today near room temperature. This property is largely attributed to compositional variations, resulting in improved figure of merit. Considering this, present study aimed at characterizing the optical and thermoelectric properties of microstructured p-type (Bi2Te3)x(Sb2Te3)1 – x alloys for enhanced thermoelectric efficiency. High performance microstructured p-type (Bi2Te3)x(Sb2Te3)1 – x alloys were prepared by melting technique. The phase, optical band gap, microstructure, carrier type concentration and thermoelectric properties of the prepared alloys were systematically investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, hot probe p-n type tester, four-probe method, κ-probe method and Seebeck coefficient measurement system. The electrical conductivity and Seebeck coefficient were measured in the temperature range 298-473 K to elucidate the Sb content effect on the thermoelectric properties of the p-type (Bi2Te3)x(Sb2Te3)1 – x alloys. The optical band gap decreased with increasing Sb content. Also, with the increase of Sb content, the electrical conductivity increased substantially, the thermal conductivity increased significantly and the Seebeck coefficient decreased marginally, which lead to a great improvement in the thermoelectric figure of merit. The maximum power factor of 3.2 × 10 – 3 Wm – 1K – 2 and figure of merit of 0.72 were obtained at 300 K for the composition of 15 %Bi2Te3-85 %Sb2Te3. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3582

Three dimensional point cloud compression and decompression using polynomials of degree one

© 2019 by the authors. The availability of cheap depth range sensors has increased the use of an enormous amount of 3D information in hand-held and head-mounted devices. This has directed a large research community to optimize point cloud storage requirements by preserving the original structure of data with an acceptable attenuation rate. Point cloud compression algorithms were developed to occupy less storage space by focusing on features such as color, texture, and geometric information. In this work, we propose a novel lossy point cloud compression and decompression algorithm that optimizes storage space requirements by preserving geometric information of the scene. Segmentation is performed by using a region growing segmentation algorithm. The points under the boundary of the surfaces are discarded that can be recovered through the polynomial equations of degree one in the decompression phase. We have compared the proposed technique with existing techniques using publicly available datasets for indoor architectural scenes. The results show that the proposed novel technique outperformed all the techniques for compression rate and RMSE within an acceptable time scale

Arc discharge synthesis of CNTs in hydrogen environment in presence of magnetic field

In this study the effect of hydrogen ambient environment on the growth of carbon nanotubes by arc discharge plasma in presence of external magnetic field is investigated. The samples collected from cathode deposit are analyzed by field emission scanning electron microscopy and Raman spectroscopy. Results show an increase in carbon nanotube growth with increase in hydrogen ambient pressure. The magnetic field considerably enhances the growth of carbon nanotube as observed in FESEM micrographs. In Raman spectrum, high intensity of G peak as compared to D peak indicates the presence of high quality nanotubes. Magnetic effect remarkably decreases ID/IG ratio from 1.55 to 0.31 for ambient pressure 10 mbar

PHYLLOIDES TUMOUR: REVIEW OF AN UNCOMMON BREAST PATHOLOGY AT A SPECIALIZED CANCER CENTRE

Purpose: Phyllodes tumours are rare breast tumours that comprise almost 1% of breast tumours. The outcome for these tumours is generally considered better than breast cancers. We review the cases of phyllodes tumour presenting to a specialised cancer centre over a 14 year period. Materials and Methods: All case records with the diagnosis of phyllodes tumour between 1999 and 2012 were retrieved from the cancer registry. Patient demographics, tumour site, size, axillary lymph node status, whether primary or recurrent, metastatic status, histological type, type of surgery, any complication, margin positivity, post-operative radiation therapy, local or distant recurrence, morality and follow-up duration were recorded. Data were analysed using SPSS. Results: A total of 77 cases of phyllodes tumour were seen between 1999 and 2012. All patients were female with a mean age of 39.9 years. All patients presented with a breast lump with median duration of 8 months. Almost two-thirds (65%) of the patients presented with primary tumour compared to 10% recurrent tumours and the rest were referred after surgery outside. Median size on histopathology was 5 cm (IQR 3.5–8.5 cm). Over a median follow-up duration of 31 months (IQR 9–48 months), 69 patients (89.6%) were alive, while 3 patients (3.9%) did not survive and 5 patients (6.4%) were lost to follow-up. Recurrence was seen in 10 (13%) patients with median time to recurrence of 12 months (IQR 7–24). Involved axillary lymph nodes and borderline or malignant histopathology were found to be signi cantly associated with recurrence (P = 0.04), while margin positivity, post operative radiation therapy and histopathology were not signi cantly associated with recurrence. Conclusion: Phyllodes tumour is an uncommon breast tumour that is predominantly treated with surgical excision. Although survival with these tumours is better compared to breast cancers, involvement of axillary nodes and borderline or malignant histopathology confer an increased risk of recurrence in these patients. Key words: Breast cancer, phyllodes tumours, survival

Mechanical Stimulation of Fibroblasts by Extracorporeal Shock Waves: Modulation of Cell Activation and Proliferation Through a Transient Proinflammatory Milieu

Extracorporeal shock waves (ESWTs) are \u201cmechanical\u201d waves, widely used in regenerative medicine, including soft tissue wound repair. Although already being used in the clinical practice, the mechanism of action underlying their biological activities is still not fully understood. In the present paper we tried to elucidate whether a proinflammatory effect may contribute to the regenerative potential of shock waves treatment. For this purpose, we exposed human foreskin fibroblasts (HFF1 cells) to an ESWT treatment (100 pulses using energy flux densities of 0.19 mJ/mm2 at 3 Hz), followed by cell analyses after 5 min, up to 48 h. We then evaluated cell proliferation, reactive oxygen species generation, ATP release, and cytokine production. Cells cultured in the presence of lipopolysaccharide (LPS), to induce inflammation, were used as a positive control, indicating that LPS-mediated induction of a proinflammatory pattern in HFF1 increased their proliferation. Here, we provide evidence that ESWTs affected fibroblast proliferation through the overexpression of selected cytokines involved in the establishment of a proinflammatory program, superimposable to what was observed in LPS-treated cells. The possibility that inflammatory circuits can be modulated by ESWT mechanotransduction may disclose novel hypothesis on their biological underpinning and expand the fields of their biomedical application

Role of Endoscopic Assisted Microsurgery for Pituitary Tumors

Objective: To determine the outcome of endoscopic assisted microsurgery for pituitary tumors in terms of gross tumor removal and visual field improvement. Materials and Methods: This Descriptive case series conducted at Department of Neurosurgery, Lahore General Hospital Lahore over a period of six months from July 2012 to December 2012. Sixty five patients were included through non-probability purposive sampling technique. All cases of pituitary tumor diagnosed on MRI/CT scan of either gender having age 18 – 80 years and patients with recurrent cases, sellar and with suprasellar extension (assessed on CT and MRI findings). Informed consent was taken from the patients. All laboratory tests were done in hospital laboratory and reported by hospital pathologist Shaukat Khanum Memorial Hospital Lahore. Pre- and post-operative visual field status (at least 3 months after surgery) was analyzed. Surgery was performed by a single team of surgeons. Surgical procedure involves introduction of 4-mm to 2.7mm endoscope to visualize the sphenoethmoid recess. The bilateral sphenoid Ostia are entered. The posterior nasal septum was incised at middle turbinate and it was patients resected. All the data was entered and analyzed by using SPSS 20. Fre-quency and percentages were calculated for all qualitative variables like gross removal rate and visual filed improvement. Results: The mean age of the patients was 50.46 ± 17.80 years. There were 64.62% male patients and 35.38% female patients. Gross removal of tumor was observed in 56 (86.2%) and visual field improvement was found in 92.31% patients. 56 patients were those in which gross removal of tumor was observed in which 34 were males and 22 were females, similarly in 9 patients them was subtotal resection of tumor in which 8 were males and only 1 was female. Conclusion: In this study, gross removal of tumor as well as visual field improvement was found in maximum number of patients and it is concluded that endoscopic assisted microsurgery for pituitary tumors is a better technique for such surgeries.&nbsp

Multi-walled carbon nanotubes grow under low pressure hydrogen, air, and argon ambient by arc discharge plasma

Multi-walled carbon nanotubes (MWCNTs) were grown on cathode deposit by arc discharge plasma under H2, Ar, and air ambient environment. The influence of ambient gas pressure on the structure and physical properties of carbon nanotube were compared. Herein, we highlight the influence of ambient environment and pressure to grow high quality carbon nanotubes. Field emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and X-ray diffraction were used for structural characterization and yield determination. The result revealed that background gas and pressure were crucial factor for growing highly crystalline and highly graphitic with ID/IG ratio 0.237 obtained for MWCNTs’ synthesized in H2 environment with extreme low defects

Trachoma Decline and Widespread Use of Antimicrobial Drugs

Widespread use of antimicrobial drugs may be contributing to trachoma decline

Supplementary data for the article: Petrović, M. M.; Roschger, C.; Chaudary, S.; Zierer, A.; Mladenović, M.; Marković, V.; Trifunović, S.; Joksović, M. D. Low Cytotoxic Quinoline-4-Carboxylic Acids Derived from Vanillin Precursors as Potential Human Dihydroorotate Dehydrogenase Inhibitors. Bioorganic & Medicinal Chemistry Letters 2021, 46, 128194. https://doi.org/10.1016/j.bmcl.2021.128194.

Supplementary material for: [https://doi.org/10.1016/j.bmcl.2021.128194]Related to published version: [https://cherry.chem.bg.ac.rs/handle/123456789/4550