Concentric Circles Research Articles

Adaptive decentralized fuzzy compensation control for large optical mirror processing systems

PurposeLarge optical mirror processing systems (LOMPSs) consist of multiple subrobots, and correlated disturbance terms between these robots often lead to reduced processing accuracy. This abstract introduces a novel approach, the nonlinear subsystem adaptive dispersed fuzzy compensation control (ADFCC) method, aimed at enhancing the precision of LOMPSs.Design/methodology/approachThe ADFCC model for LOMPS is developed through a nonlinear fuzzy adaptive algorithm. This model incorporates control parameters and disturbance terms (such as those arising from the external environment, friction and correlation) between subsystems to facilitate ADFCC. Error analysis is performed using the subsystem output parameters, and the resulting errors are used as feedback for compensation control.FindingsExperimental analysis is conducted, specifically under the commonly used concentric circle processing trajectory in LOMPS. This analysis validates the effectiveness of the control model in enhancing processing accuracy.Originality/valueThe ADFCC strategy is demonstrated to significantly improve the accuracy of LOMPS output, offering a promising solution to the problem of correlated disturbances. This work holds the potential to benefit a wide range of practical applications.

The role of implants and implant prostheses on the accuracy and artifacts of cone-beam computed tomography: an in-vitro study

To assess the accuracy of CBCT in implant-supported prostheses and to evaluate metal artifacts with and without implants or implant prostheses. Accuracy and artifacts were assessed in the dried mandible at three points on the buccal and lingual cortical plates on the mandible's body near the crest and the base. On the buccal cortical plate, these points were labelled as A, B and C near the crest and D, E and F near the base of the body of the mandible. Similarly, points a to f were marked on the lingual cortical plate corresponding to points A to F. The study had two control groups, C0 for physical linear measurement (PLM) and C1 for radiographic linear measurement (RLM) and artifact assessment. There were seven test groups, TG 1 to 7, progressing from a single implant to implant full-arch prosthesis. For accuracy assessment, PLM was compared to RLM. CBCT artifacts were investigated in images integrated at 0.25 mm, 10 mm, and 20 mm at regions of interest on concentric circles at different intersecting angles by comparing grayscale values at C1 and TG1 to 7. The data were collected and statistically analyzed. A significant difference was observed between C0 and C1, and RLM in test groups at the superior axial plane. Similarly, PLM and test RLM in the sagittal plane at A-B, B-C, and D-E were statistically significant. A significant difference between PLM and RLM was also observed in the vertical plane at A-D, B-E, and C-F. Quantification of CBCT artifacts in the presence of implants or prostheses revealed that full-arch prostheses had the highest mean grayscale value, whereas single implants with a prosthesis had the lowest. The mean grayscale change was greatest around the implant and implant prosthesis. The mean grayscale value was maximum at 20 mm voxel integration scales (VIS) and lowest at 0.25 mm. CBCT is a clinically reliable device. Metal in implants or implant-supported prostheses prevents true assessment of the peri-implant area; therefore, lower VIS is suggested in the presence of implants or implant prostheses.

Elimination of gas entrapment in droplet-based 3D printing by induced electric-field

Gas entrapment during droplet deposition may induce pinhole defects in droplet-based 3D printing. However, achieving effective suppression of gas entrapment is challenging given that gas entrapment behavior is the physical essence of droplet impact. Inspired by that charged droplets will be deformed in the electric field, a method of suppressing gas entrapment by weakly charging the droplet was proposed. Here, a numerical model is developed to systematically investigate the gas entrapment behaviors during neutral droplet and charged droplet deposition. Results show that the electric field will be induced before the instant of droplet impact on the substrate, which fundamentally changes the gas entrapment behavior. Moreover, the competition mechanism between Maxwell stress and lubrication pressure during droplet deposition is revealed, and the pressure inside and outside the droplet bottom profile is quantified. Compared with the neutral droplet, the additional electric stresses act against the lubrication pressure, which increases sharply before the droplet touches the substrate. When the charge level reaches a critical value, the electric stresses are slightly stronger than the lubrication pressure at the bottom center, and the decrease rate of electric stresses along the horizontal distance r is higher than that of gas film pressure, leading to a central touchdown with residue concentric circle gas rings. Furthermore, the evolution of phase fraction, velocity field, and pressure field during droplet deposition with different charge level is investigated comprehensively. Based on this, the dimensionless scale of critical charge level to fundamentally eliminate gas entrapment is obtained. This work may provide new insights into various applications involving droplet deposition, such as eliminating pinhole defects in droplet-based additive manufacturing.

An unusual colon mass.

A 55-year-old man came to our hospital for a colonoscopy due to periumbilical paroxysmal pain. The colonoscopy showed a huge mass near the ascending colon, with necrosis on the surface and unclear basal boundary. The structure of the residual and basal mucosa of the mass was similar to the normal intestinal mucosa. The biopsy pathology showed inflammatory cells infiltration. The patient underwent an appendectomy 30 years ago. In order to further clarify the nature of this mass, an abdominal enhanced computerized tomography (CT) was arranged for him. The CT showed segmental thickening of the ascending colon and "concentric circles" in the ileocecal part, which were consistent with intussusception like change. Then, we arranged a surgery for him. The intraoperative exploration revealed that the mass was located in the ileocecal part, about 5cm*4cm*3cm in size, soft in texture, and the intestinal tube was mildly edema. After opening the specimen, we found that the appendiceal stump had intratussed into the cecum and forming the granulomatous new tissue. Postoperative pathology showed proliferation of submucosal adipose tissue and granulation tissue, and infiltration of inflammatory cells with necrosis.

Моделирование границ рабочего пространства планарного трёхзвенного манипулятора

A study of the boundaries of the working space of a three-link planar manipulator, specified by analytical equations, is carried out. A new geometric interpretation of these samples is proposed. On its basis, it is established that outer space consists of two-parameter volumes of eccentric and concentric circles. When transforming such environments into four-dimensional space, two types of hypersurfaces are obtained, which represent a geometric model of the manipulator's workspace. The discriminants of these hypersurfaces on the hyperplane are two two-dimensional surfaces. Both an analytical description of these surfaces and their computer models are obtained. As a result, it is established that the boundaries of the working space on the plane of the mechanism are the discriminants of such surfaces. To confirm the reliability of the results obtained, as an example, an inverse kinematics problem is solved on discriminant surfaces — the values of generalized coordinates at the boundary points of the manipulator’s workspace are determined for their given Cartesian coordinates.

Biomimetic concentric microgrooved titanium surfaces influence bone marrow-derived mesenchymal stem cell osteogenic differentiation via H3K4 trimethylation epigenetic regulation

Material surface micromorphology can modulate cellular behavior and promote osteogenic differentiation through cytoskeletal rearrangement. Bone reconstruction requires precise regulation of gene expression in cells, a process governed by epigenetic mechanisms such as histone modifications, DNA methylation, and chromatin remodeling. We constructed osteon-mimetic concentric microgrooved titanium surfaces with different groove sizes and cultured bone marrow-derived mesenchymal stem cells (BMSCs) on the material surfaces to study how they regulate cell biological behavior and osteogenic differentiation through epigenetics. We found that the cells arranged in concentric circles along the concentric structure in the experimental group, and the concentric microgrooved surface did not inhibit cell proliferation. The results of a series of osteogenic differentiation experiments showed that the concentric microgrooves facilitated calcium deposition and promoted osteogenic differentiation of the BMSCs. Concentric microgrooved titanium surfaces that were 30 μm wide and 10 μm deep promoted osteogenic differentiation of BMSC by increasing WDR5 expression via H3K4 trimethylation upregulation.

Sources and Models of the Zoological Excursus in George of Pisidia’s Hexaemeron. Part 1: Aithyia, Ibis, Spider

This article opens a series devoted to investigating the sources of the ample zoological excursus (vv. 916–1223) in the Hexaemeron by George of Pisidia, a 7th-century Byzantine poet. Since the two attempts to find a general formula for George of Pisidia’s treatment of his models have led to directly opposite results (according to Max Wellmann, the poet distanced himself from pagan zoologists; according to Luigi Tartaglia, on the contrary, he drew material from them, favouring Aelian), it seems that the question of the poem’s sources should be addressed by a step-by-step examination of passages, paying attention to such evidence as the coincidence of minor details or words. In v. 1116 the unusual metaphor “aithyia, bending its winged cloud” (in the sense of “spreading its wings”) makes one think of an (unconscious?) association with Arat. Phaen. 918–920, where “a stretching cloud” is mentioned in the catalogue of storm’s signs in immediate juxtaposition to the flapping of the wings of seabirds. In vv. 1117–1124 (the self-cleansing of the ibis) the reference to Galen is not a mere metonymy (= “the most skillful physician”), as interpreters have hitherto thought, but points to the poet’s source: in the Galenic corpus this story is attested three times, and the passage closest to George of Pisidia’s account is [Galen.] Introd. 1.2. In vv. 1154–1159 (the structure of the web) the confused sequence of the stages of the spider’s work (first concentric circles, then radial threads), that contradicts both reality and (which is more important) the ancient tradition going back to Book IX of Historia animalium, seems to betray the influence of John Philoponus (De opif. mundi, p. 257, 24 sqq. Reinhardt). In Philoponus’ text this sequence is justified by the fact that his rhetorical passage describes, strictly speaking, not the web itself, but a drawing of it made by a “diligent geometer”.

Rural revitalization background thinking of medical vocational colleges assisting the development of new rural health undertakings

With the steady progress of the Healthy China and the rural revitalization strategy, the development of health services in new rural areas has become a “concentric circle” . This is not only a practical need for building a healthy China but also an essential requirement for the Party and the State to implement rural revitalization. At present, the development of health services in new rural areas faces numerous challenges, such as a lack of medical resources, a lack of health knowledge dissemination, and backward medical service levels. The integration of medical vocational colleges in their actual efforts to assist the development of health services in rural areas is not only an important manifestation of vocational education serving society but also significantly contributes to further assisting the implementation of the rural revitalization strategy.

First Report of Pantoea agglomerans Causing Leaf Blight on Schisandra chinensis in China.

Schisandra chinensis (Turcz.) Baill is a perennial liana, which is widely cultivated and used in China. In August 2022, Schisandra chinensis leaves with small light brown spots were found on plants growing in Fusong (127°28'E, 42°33'N) of China. There was 15% disease incidence and 50% disease severity of Schisandra chinensis in 2-ha fields of S. chinensis. As the disease progressed, the spots become darker and form round or irregular concentric circles. Leaves with brown spot symptoms were collected from the field. Leaf pieces (5 mm × 5 mm) were excised from lesion margins, surface disinfected with 75% ethanol for 1 min, followed by 1.5% sodium hypochlorite for 3 min, and incubated on Luria Bertani (LB) solid medium at 28°C for 24 hours. Eight cultures were isolated, and representative single colony (XWWZH) was selected from the pure cultures according to colony characteristics for observation The purified colonies were round, yellow, and slimy, cells were straight rod-shaped (0.40 to 0.52 × 1.12 to 1.69 µm) were observed. The isolate was Gram negative. It was positive for methyl red reaction, lysine decarboxylase reaction, gelatin hydrolysis reactionand sucrose utilization. It was negative for indole reaction and produced H2S. The bacterium was preliminarily identified as Pantoea agglomerans based on morphological and biochemical tests (Baird et al. 2007). The 16S rDNA and a portion of rpoB of strain XWWZH were amplified and sequenced. The sequences were submitted to GenBank. (Accession OP763753 and OQ813505, respectively). Phylogenetic trees were constructed based on the 16S rDNA and rpoB gene sequences. The sequences of strain XWWZH clustered with strains P. agglomerans deposited in GenBank. The pathogenicity was verified with non-wounded S. chinensis seedlings by punching holes with sterile needles and injecting a solution of 1 × 108 CFU/ml solution. Sterile ddH2O was injected in the control experiment. The inoculated seedlings were incubated in a greenhouse at 25°C with a relative humidity of 65 to 70%. Five to eight days after inoculation, inoculated leaves, exhibited symptoms which were morphologically identical to those of the originally infected leaves whereas control plants remained asymptomatic. The pathogenicity assays were repeated twice with the same results. The re-isolated pathogen had the same morphology and DNA sequences as the original isolate obtained from the field samples, completing Koch's postulates. Strains of P. agglomerans have been reported to severely infect many plants (Ren et al.2008; Lee et al. 2010; Yang et al. 2011; Guo et al. 2019; Gao et al, 2022), but to the best of our knowledge, this is the first report of a strain of P. agglomerans causing leaf blight on Schisandra chinensis in China. The identification of leaf blight caused by P. agglomerans will enable farmers to prevent and manage it ahead of time to reduce losses.

DYNAMICS OF HEAVY METALS MIGRATION IN THE SOIL AS A CONSEQUENCE OF MILITARY ACTIONS

The military operations in Ukraine have consequences for the biosphere, which is negatively affected by the hostilities, causing its destruction and degradation, - soils. It is currently impossible to fully assess the impact of military and terrorist actions on the environment due to the lack of accurate information. The shelling of civilian and strategically important objects in Ukraine created synergistic conditions for the environment to accumulate and enter through leaching from the soil a large amount of heavy metals into surface water. Accordingly, this leads to mass degradation of not only the soil environment, but also the hydrosphere and plant life. The entry of potentially toxic elements (PTE) into the environment, soil and plants is accompanied by their oxidation and other chemical processes. Soil sampling was carried out by the method of a concentric circle, in the canter of which is the source of pollution, which allows us to assess the degree of distribution of potentially toxic elements depending on the depth of the well. In our research on the content of heavy metals in the soil during the shelling of Lviv and 6 months later, XRF and ICP analyzes of soil samples. The results of the analysis of the content of heavy metals in the soil after 6 months show that the concentration of cadmium is reduced by two times; copper and nickel, respectively, 3 and 3.5 times; lead+ and chromium - twice. It is known that heavy metals do not undergo decomposition processes, but can only be redistributed between natural environments. They tend to concentrate in living organisms, causing various pathologies.

Optical aberrations and vector beams as a tool for hollow structured light generation

A method for the generation of structured laser beams (SLB) and hollow structured laser beams (HSLB) whose transverse profiles are invariant and can propagate to infinity is described. SLBs are formed after passing through an optical system that generates a special wavefront as a combination of rotationally symmetric optical aberrations. Transverse profile consists of concentric circles with a very bright central core and a bounding outer-ring. The divergence of the central core 0.01 mrad has been experimentally confirmed. When the system was illuminated with a special vector beam, a hollow SLB (HSLB) beam was generated. Its central part is very narrow and completely dark. Unlike conventional hollow beams, where the electric field is zero in the dark areas, an electromagnetic field with the zero Poynting vector is present in this part of the beam. By varying the illumination parameters of the vector beam, it is possible to obtain situations where there is a longitudinal component of the electric field or/and magnetic field in the central core. The simulation results are in good agreement with the SLB profile measurements using a polarization camera.

Large field of view camera calibration method based on self-made concentric circle array calibration board

Large field of view camera calibration method based on self-made concentric circle array calibration board

Feto-Maternal Interface Organ-on-Chip: A New Technology to Study Ascending Infection.

Modeling human pregnancy is challenging as two subjects, the mother and fetus, must be evaluated in tandem. To understand pregnancy, parturition, and adverse pregnancy outcomes, the two feto-maternal interfaces (FMi) that form during gestation (i.e., the placenta and fetal membrane) need to be investigated to understand their biological roles, and organ dysfunction can lead to adverse outcomes. Adverse pregnancy outcomes such as preterm rupture of the membranes, spontaneous preterm birth, preeclampsia, intra-uterine growth restriction, and gestational diabetes rates are on the rise worldwide, highlighting the need for future studies and a better understanding of molecular and cellular pathways that contribute to disease onset. Current in vivo animal models nor in vitro cell culture systems can answer these questions as they do not model the function or structure of human FMis. Utilizing microfabrication and soft-lithography techniques, microfluidic organ-on-chip (OOC) devices have been adapted by many fields to model the anatomy and biological function of complex organs and organ systems within small in vitro platforms.These techniques have been adapted to recreate the fetal membrane FMi (FMi-OOC) using immortalized cells and collagen derived from patient samples. The FMi-OOC is a four-cell culture chamber, concentric circle system, that contains both fetal (amniochorion) and maternal (decidua) cellular layers and has been validated to model physiological and pathological states of pregnancy (i.e., ascending infection, systemic oxidative stress, and maternal toxicant exposure). This platform is fully compatible with various analytical methods such as microscopy and biochemical analysis. This protocol will outline this device's fabrication, cell loading, and utility to model ascending infection-related adverse pregnancy outcomes.

Characteristics of Peripheral Retinal Refraction and Its Role in Children with Different Refractive States.

Peripheral retinal refraction plays a crucial role in myopia, but the specific mechanism is not clear. We refined the retinal partitions to explore the characteristics of peripheral retinal refraction and its role in emmetropic, low, and moderate myopic children aged 6 to 12 years. A total of 814 subjects (814 eyes) were enrolled in the study. The participants were divided into three groups according to the central spherical equivalent refraction (SER), which were emmetropia group (E), low myopia group (LM) and moderate myopia group (MM). Multispectral refractive topography (MRT) was used to measure the retinal absolute and relative refractive difference value (RDV) in different regions. The range was divided into superior, inferior, temporal, and nasal RDV (SRDV, IRDV, TRDV, and NRDV) on the basis of several concentric circles extending outward from the macular fovea (RDV15, RDV30, RDV45, RDV30-15, RDV45-30, and RDV-45). Kruskal-Wallis test was used to analyze the differences of peripheral refraction for all the regions among the three groups. Spearman rank correlation was performed to explore correlations between SER and RDV, axial length (AL) and RDV. The absolute value of RDV decreased with increasing degree of myopia in all regions (P < 0.01). Subjects with different refractive degrees had different relative value of RDV. In nasal position within 45° and temporal position within 30°, the peripheral retina exhibited significantly different relative hyperopic refractive status among Group E, Group LM, and Group MM (P < 0.05). SER was negatively correlated with NRDV within 30° (especially in the range of NRDV30-15) (r = -0.141, P < 0.01), positively correlated with TRDV within 15° (r = 0.080, P = 0.023), and not significantly correlated with SRDV and IRDV when the retina was divided into four parts. AL was positively correlated with NRDV within 30° (especially in the range of NRDV30-15) (r = 0.109, P = 0.002), negatively correlated with TRDV within 15° (r = -0.095, P = 0.007). The peripheral defocus has significant implications for the genesis of myopia. The peripheral defocus of the horizontal direction, especially within the range of NRDV30, has greater effect on the development of myopia in children. Higher NRDV30 is associated with lower SER and longer AL.

Три круга интертекстуальности: «усадебный миф» в романе М.Л. Степновой «Сад»

The article analyzes the landmark novel of Russian writer M.L. Stepnova, The Garden (2020), which has aroused the public’s and critic’s interest, continuing the “estate text” of Russian literature of the 19th–20th centuries. It is shown that the image of the garden in the work is both national (the whole tradition of the Russian “estate text”) and universal (the Bible, Voltaire, H.L. Borges, U. Eco, etc.). The key to an adequate reading of the postmodern novel with its “semantic insolubility,” narrative “nonselectio,” experiments on human identity, an invitation to the “alternative history,” etc. is an analysis of its intertextuality, generating original life-creating strategies. There are three concentric circles of intertextuality that diverge in the breadth of space-time coverage: character, author-narrative, and mythopoetic. If in character terms the protagonist of the work — the garden — directly participates in people’s lives, at the author-narrative level becomes an ideologeme, symbolizing with his death under the axes of hired workers the tragic fate of Russia at the turn of the 19th–20th centuries, then in the super-author’s mythopoetic sphere reveals the quality of practical immortality, indestructibility. The reason for the suicidal cutting down of the garden of the grown-up Princess Boryatinskaya is the excommunication of this heroine from fiction, primarily “estate,” with its powerful lifecreating potential. The scientific novelty of the research lies in the systematic analysis of the intertextual strategies of the iconic modern novel for the first time and the identification of their three-level structure. The article applies historical-literary and cultural approaches, methods of historical poetics, and structural-semiotic analysis and uses the modernist and postmodern thesaurus paradigms.

The Role of Social Support in Concussion Rehabilitation: A Prospective Mixed Methods Study of Canadian University Athletes’ Return to Sport

Context: Social support is an important consideration during athletes’ rehabilitation following a concussion. Yet, its influence during the return-to-sport (RTS) strategy has been underexplored. Design: Concussed athletes’ experiences with social support during RTS were explored prospectively using an explanatory sequential mixed methods design. Methods: University rugby, basketball, and track and field athletes (N = 8) from a single Canadian institution, 19–23 years of age (mean = 20.63, SD = 1.51), completed concentric circles maps, the Perceived Available Support in Sport Questionnaire, and 2 semistructured interviews during their RTS. We analyzed concentric circles maps and questionnaire data descriptively and interview data using codebook thematic analysis. Results: Athletes identified 16 different social support agents. The 5 most important agents during RTS were athletic therapists, student therapists, head coaches, significant others, and teammates/friends. Significant others provided the most emotional (mean = 2.82, SD = 1.85) and esteem (mean = 2.63, SD = 1.85) support, and the athletic therapist (mean = 1.82, SD = 1.35) and head coaches (mean = 0.93, SD = 1.19) provided the most informational and tangible support. We generated 4 themes from athletes’ interviews: social support behaviors, contextual factors, concussion and RTS factors, and psychological readiness factors. Conclusions: The number of social support agents present, frequency of support types, and demonstration of support behaviors decreased across the concussion RTS strategy. Contextual (ie, toughness), concussion (ie, visibility), and RTS (ie, prognosis uncertainty) factors influenced athletes’ perceptions of social support agents’ support behaviors. Results add to our limited understanding of athletes’ social support during RTS following a concussion and suggest exploring the integration of behavior-specific (eg, checking in, providing reassurance, and demonstrating compassion) social support strategies to promote concussion rehabilitation and readiness to RTS.

Design of Command and Dispatch System for Automatic Reading of Meter Images in Substations by UAV Inspection Photos

The application of the combination of unmanned aerial vehicles (UAVs) and artificial intelligence is a hot topic in the intelligent inspection of substations, and meter reading is a very challenging task. This paper proposes a method based on the combination of YOLOv6n object detection and Deeplabv3[Formula: see text] image segmentation and performs post-processing on the segmented images to obtain meter readings. First, YOLOv6n is used to detect the meter area of the aerial image and classify the meters. Second, the detected meter images are fed into the image segmentation model. The backbone network of the Deeplabv3[Formula: see text] algorithm is improved by using the MobileNetv3 network, which not only effectively extracts pointers and scales, but also makes the model more lightweight. Third, License Plate Recognition Network (LPRNet) is used to recognize digital meter images. In order to solve the problem of inaccurate pointer meter readings, to begin with, the segmented image is corroded; in addition, the circular dial area is flattened into a rectangular area by concentric circle sampling method. Finally, the meter reading is calculated by the position of the pointer, the scale and the total range of the meter. The post-processing part uses numba to optimize the inference speed. The experimental results show that in two datasets, The mean average precision of 50 (mAP50) accuracy of the YOLOv6n model using this method reached 99.71% and 98.60%, respectively, and the inference speed of a single image was 17.1[Formula: see text]ms and 13.2[Formula: see text]ms, respectively. The mean intersection over union (mIoU) of the image segmentation model reached 82.00%, 74.73%, 73.50%, 82.26% and 73.20%, respectively, and the single segmentation speed reached 33.7[Formula: see text]ms. The LPRNet model has a recognition accuracy of 99.17% and a single image inference speed of 14.7[Formula: see text]ms. At the same time, several mainstream object detection and semantic segmentation algorithms are compared. The experimental results show that the method in this paper greatly improved the accuracy and efficiency of intelligent inspection of substation meter readings.

Tarefas com base na Fonotática para estimulação de consciência fonológica

The purpose of this paper is to present some fundamental phonotactic concepts and their importance in phonological awareness tasks in literacy. Only after the beginning of their schooling do children start to observe and notice the segmental elements of words. Furthermore, mastery of phonological awareness will determine children’s reading success in school, which in turn affects their proficiency in adulthood (BYRNE; LEDEZ, 1983). In this study, we present a playful way to explore the sonority scale perception with students through the recognition of geometric shapes (circle and straight line), according to the Sonority Syllable Model (SSM), proposed by Basbøll (2005). It is an alternative proposal to the phonotactic description and analysis that uses distinctive features in its sound organization. In our proposal, we use a phoneme-grapheme correspondence, but, as Basbøll (2005) suggests, we firstly establish which one is the prototypical syllable peak, i.e., main/central peak, in order to determine the implicational relations among the segment types. In addition, in a playful way to illustrate this relation, we make use of a set of concentric circles known as Euler’s diagram. This set of circles is a mathematical set used to demonstrate the intersection among elements. Lastly, we show how this adaptation may be used in a pedagogical practice with children and adults in the literacy stage.

Afghan Enghlish Pronunciation Intelligibility: A Historically Segmental Phonetic Approach

The increasing demand for English learning and usage; and the instruction supply turns this work a mandatory structure to identify the divergences and convergences. This research examines the English pronunciation intelligibility features – precisely focused on segmentals – in case of Afghanistan. In order to do so, primarily, the recordings are analyzed perceptually and the deviations are verified acoustically. This research employees sociolinguistic variables for examination. The level of intelligibility of this variation along the international platform has been scrutinized. In methodological framework, respondents recorded data has been used as an intelligibility test material in the three concentric circles – inner, outer, and expanding – proposed by (Kachru, 1985). The topic entailment is vast. The researcher intends to comprehensively look into English pronunciation of Afghans pertaining in the context of Phonetic segmentals.

Introduction to the Special Issue ‘The OSCE High Commissioner on National Minorities: Three Levels of Work over Thirty Years’

International institutions often operate in a range of concentric circles. The activities and pronouncements of their leaders generally grab the biggest headlines. Meanwhile, their staffs, offices, and departments work tirelessly behind the scenes, but they also project important ripples through work with broader communities, civil society, and the public. Lastly, the effort that these institutions put in over the long term might see instruments come into place that help to build international legal order for future generations.&#x0D; The three articles proposed in this special issue echo this model as it relates to one particular international institution, the High Commissioner on National Minorities (HCNM) at the Organization for the Security and Cooperation in Europe (OSCE).