Oval Form Research Articles

Atypical cervical mass

Hemoptysis as first sign of a thyroid differentiated cancer represents an atypical behavior of a cervical mass, usually associating lung metastasis or direct tracheal invasion. Late presentation (for instance, due to COVID-19 pandemic circumstances) associates a poor prognosis. This is a case report. We aim to introduce a 70-year old female case who was admitted for an atypical cervical mass associating hemoptysis as onset; the diagnostic of metastatic papillary thyroid cancer was established; the delay of hospital admission did not allow a radical intervention with curative purpose. The lady was admitted as an emergency for an endocrine checkup of a progressively growing cervical mass in addition to hemoptysis that developed a few weeks before. Specific blood endocrine panel confirmed the normal thyroid function with negative thyroid autoimmunity. Anterior cervical ultrasound showed intensely hypoechoic, inhomogeneous, large structure, with macro-calcifications (TIRADS 5). Fine needle aspiration cytology exam revealed a papillary carcinoma of thyroid, consistent with Bethesda 6 score. Computed tomography detected a voluminous thyroid tumor process of 92 by 58 by 89 mm. The superior, middle and inferior left later-cervical lymph nodes which are located posterior to the later-cervical vascular package, have maximum diameters of approximately 30/34 mm (axial) and 54 mm (vertical). Multiple micro-nodules of oval form in both lungs have diameters up to 29 mm (probably secondary lesions). Osteolytic tumor lesion at the level of the lateral arch of the vertebral body thoracic T 1 and the head of the left first rib extends to the level of the left foramen from the spaces cervical C7 to thoracic T1, respective between thoracic T1 and T2, with maximum diameters of 23/32 mm. CT also showed brain metastasis, as a iodophil, inhomogeneous, well-contoured tumor that is located on the right frontal precentral gyrus, with maximum diameters of 10/13 mm (axially) and 13 mm (vertically) and small areas of perilesional edema. Further adjuvant therapy was refused by the patient; palliative tracheostomy is needed. Atypically aggressive presentation of well differentiated thyroid cancer of papillary type might be associated with delayed presentation; whether this comes as direct consequence of pandemic era is still a matter of debate.

The Barzavand and Neysian Copper Deposits, NW Naein, Central Iran zone: Constraints on styles mineralization and geochemical signatures of hydrothermal alterations.

Field observations in the northwest of Naein (Central Iran zone) indicate various types of alteration products have extended into pyroclastic and volcanic units with Oligo- miocene age. It seems the Zefreh (with NW- SE trend) and Kachumesqal (with E-W trend) faults are effective factors in the formation of Neysian and Barzavand copper deposits respectively. Alteration in Barzavand copper deposit (with stratabound form) includes pyritization, propylitization, zeolitization, saussuritization, uralitization and silicification, while in Neysian (with oval form) include phyllic, advanced argillic, argillic and propylitic. Geochemical studies in Barzavand show the positive correlation between (La/Lu)N, (La/Yb)N and (La/Sm)N and CaO (r= 0.70 to 0.96) related to propylitization of host rock basalt and increase in pH of fluids responsible for mineralization that play important role in differentiation of lanthanides in study area. The Barzavand copper deposit has submarine volcanism, diagenesis, burial metamorphism and weathering stages during its evolution. Remarkable geochemical features in Neysian include high (La/Lu)N, Ba and Sr values than La, Ce and Y. It seems that extensive alteration occurred along with hypogene and supergene processes in Neysian. According to alteration properties, mineralogy and the whole-rock geochemistry, the Barzavand and Neysian copper deposits are most similar to Manto- type and porphyry copper deposits respectively.

Comparison of Bougainvillea spectabilis and Bougainvillea glabra species inhibited in Pakistan based on microscopic studies: Light microscope and scanning electron microscope.

The anatomical variations of two plants from the Nyctaginaceae family, Bougainvillea spectabilis and Bougainvillea glabra, were studied using light and scanning electron microscopy methods in this work. Bougainvillea is a dicotyledonous with defensive traits that can withstand extreme (hot and dry) settings; according to the findings, crystal inclusions in cells, woody spines, and an abnormal development pattern are all features that help them survive against predators and are unique to this species. The Bougainvillea plant's leaves are arranged in simple pattern, alternate to each other along stem having an undulate leaves edge and an oval form. The xylem and phloem, palisade, parenchyma midrib, spongy mesophyll, raphide crystal bundles, and trichomes were all visible when bracts and leaves were transversally sectioned and dyed with toluidine blue O (TBO). The presence of crystals was confirmed by a detailed examination of the transverse leaves by using bright-field and cross-polarizing microscopy. Dissecting microscopic examination showed that all the leaves revealed leaves venation pattern that had midvein, lateral veins areoles, and trichomes. Although trichomes have been identified on both sides, a closer look at a cleaned leaf dyed with TBO showed multicellular abundant trichomes on adaxial surface. Stomata complexes were typically found on the abaxial surface of the leaf according to epidermal peels. Present studies also showed that on adaxial side, stomata were lesser in number or were absent and also showed that the morphologies of the pavement cells on the adaxial and abaxial sides of the leaf differed.

Relationship between maxillary sinuses’ shapes and their contacts with upper jaw teeth roots according to computer tomography

Background. Rhinosinusitis, affecting both maxillary and other sinuses, is a multidisciplinary issue which otolaryngologists, dentists, neurologists and ophthalmologists are constantly dealing with. There is a remarkable diagnostic value of anthropometric indicators of maxillary sinuses of people of different genders, using CT scan images of mature age patients. Purpose – establish a relationship between the shape of the maxillary sinuses and possible contacts of the tooth roots of the maxillary dental arch in healthy mature men and women. Materials and methods. The study was performed based on the results of 102 CBCT with normal maxillary sinuses variations in adults in the frontal and sagittal plane. The examinations were performed on Point 3D Combi 500 cone-beam tomograph. The paper belongs to the «description of case series» category whis is a type of study recognized by evidence based medicine and does not claim statistical significance of the results. Results and discussion. When examining the computer tomograms of men and women in the study group, it has been found out how the shape of the maxillary sinuses (MS) affects the contact of the tooth roots with the cortical plate and the mucous membrane of the maxillary sinuses. Six main shapes of the MS are defined: trapezoidal, square, round, oval, rectangular and triangular. In the frontal plane of CBCT, the most frequent contact with the MS cortical plate is observed in the triangular and rectangular shape of the MS, that is: in the MS rectangular shape it is in contact with the 15th, 25th tooth root in 13 people (56.5% of cases) and in the triangular shape – with the 15th, 25th tooth root in 17 people (56.5% of cases). Analyzing CBCT in the sagittal plane, the most frequent contact with the cortical plate of the left MS is observed in the MS triangular shape, namely – the sinus is in contact with the 25th tooth root in 38 people (59.4% of cases). In the sagittal plane of CBCT, the contact with the tooth roots was rarely observed in the MS square and round shape. In the MS square shape, the 13th and 14th tooth roots do not come into contact with its cortical plate, and, with the mucous membrane, there is no contact of all the roots of the teeth except the 16th, in 1 person only. Conclusions. The results of the study have made it possible to trace a number of patterns of influence of the maxillary sinus shape on the tooth roots contacting it. The contact of the MS cortical plate is most often observed with 16th and 26th tooth roots, while the MS mucous membrane – with 17th and 27th tooth roots of the upper jaw. It was found that in any shape of sinus in the frontal plane, no contact of the 13th, 23rd and 24th tooth roots of the maxillary dental arch with the mucous membrane of the maxillary sinus was detected. In the CBCT frontal plane, it has been found that the most frequent contact with the MS cortical plate is observed in triangular, trapezoidal and rectangular form of the MS, and the rarest one – in oval, square and round form of MS. The study has established that in the sagittal plane of CBCT the most frequent contact with the MS cortical plate is observed in the MS triangular shape, and the rarest – in the round one.

Selçuklu Cilt Üslûbunun 15. Yüzyıl Osmanlı Ciltlerine Yansımaları (Çorum Hasan Paşa Yazma Eser Kütüphanesi Örnekleri)

Reflections of Seljuk Bookbinding Style on the 15th Century Ottoman Bindings (Examples of Çorum Hasan Pasha Manuscript Library) Abstract Binding is the general name of the book covers, which both have protective qualities and give aesthetic pleasure to the eyes with the decoration applied on it. According to the binding fragments found in Chotscho, the Turkish binding art must have started in Central Asia. These bindings set an example for Turkish bindings produced after it, both technically and in terms of decoration. Seljuk Turks, who came to Anatolia from Central Asia, brought this art with them and developed it here. The bookbinders of the period produced many decorated bookbindings during this period and formed the Seljuk style of binding. The medallion is generally in circular form and is located at the center point of the cover. From an ornamental point of view, the decoration of the front and back cover in a different way is the main feature that distinguishes Seljuk binding from other period bindings. The preference for different types of decoration in the border decorations is also one of the distinguishing features of the Seljuk binding style. Seljuk bindings also attract attention in terms of the material used in the inside of covers and the motif applied. Generally, the inside of the cover is covered with leather. There are full geometric and rūmī patterns on the inside of the cover. The effect of Seljuk binding style on Anatolian Principalities, especially Karamanids, has been determined by various studies. These effects and reflections continued in Turkish-Islamic bindings until the end of the 15th century. The theme of the article is 15th-century Ottoman bindings in which these reflections can be seen. The Çorum Hasan Pasha Manuscript Library, which has not been the subject of any study in this regard, has been determined as the research area. As a result of the researches carried out in this library, five examples from the 15th century were identified. The first of the examples is the binding of the work with inventory number 3374, with the copying date of 839/1435. This binding reflects the Seljuk binding style in terms of double-row border decoration, medallion form, and decoration technique applied with nails. The second example is the binding of the manuscript with inventory number 4064 and dated 850/1445. The waqf seal of Sayyid Ahmad Fayzī, the mufti of Çorum, is found on various pages of this work. The binding of the manuscript shows the Seljuk influence with different medallion designs on its front and back cover. In addition, the type of decoration of the corner piece is also a reflection of the same style. The third example is the binding of the manuscript dated 842/1438 with inventory number 4117. This binding is one of the important examples where the Seljuk style on one cover and the Ottoman early period binding style on the other cover come together in one binding. The fourth example is the binding of the manuscript with inventory number 4115, which was completed in the month of Muharram of 885/1479. The medallion of this binding is in narrow pointed oval form. This binding reflects the Seljuk style especially in terms of border decorations and technique. The fifth example is the binding of the manuscript with inventory number 4933. In the manuscript, there is the waqf seal dated 1201 (1786) in the name of Suleyman Feyzi and an ownership record written Muhammed b. Ahmad al-Shāfiī 934 (1527). The binding of the manuscript was decorated with Seljuk patterns using the gold-ink dyeing technique. The border decoration is also the type that stands out in the Seljuk decoration repertoire. In our article, it was determined that the Seljuk binding style continued to show its effect partially after the 15th century. Two bindings (4768, 4062) dated the 16th century are also available in the library. The binding of the manuscript, like 4117, has the characteristic of different decoration types of the front and back cover, which is the most typical feature of the Seljuk binding. As a result, it has been determined that the binding subject to the article coincides with the Seljuk bindings in terms of decoration types and production techniques and bears the reflections of this style. Reflections have also been compared with similar examples from the 15th century. According to this; the 15th century is a period in which the Seljuk State continued its continuity in terms of binding art, even if not in an administrative sense. Previous period effects that can be observed in every branch of art were also valid for 15th-century bookbinders who produced works in Anatolia.

Correlation of Three Dimensions of Palate with Maxillary Arch Form and Perimeter as Predictive Measures for Orthodontic and Orthognathic Surgery.

Hard palate is regarded as an important part of the human skull, which contributes to the separation of the oral and nasal cavities. The aims of the study were to investigate the morphology of the hard palate in order to create a general guideline of three-dimensional values of the palate in a Kurdish sample in the city of Sulaimani as well as determining the possible correlations between different palatal parameters in class I malocclusion with the maxillary arch form and perimeter. A retrospective study design was adopted by collecting 100 study models of orthodontic patients aged 16–24 years old attending different private dental clinics in the city of Sulaimani seeking orthodontic management. In this study, three-dimensional palatal measurements including depth, length, and width were measured in an attempt to discover their correlation with each maxillary arch form and perimeter. Additionally, measurements of inter-molar width, inter-canine width, and arch perimeter were carried out. About two-thirds of those seeking orthodontic treatment were females. Nearly 80% of the study sample had narrow palate followed by 15 and 5% of intermediate palate and broad palate, respectively. In regard to arch form, almost 90% of subjects were with tapered maxillary arch form and 10% of them with oval arch form. Males had increased dimensions compared to females, with significant differences, except in palatal depth in the molar area, and palatine height index, in which females showed increased dimensions than males but the differences were statistically non-significant. A strong positive correlation was observed between arch form and canine depth. In regard to arch perimeter, a strong negative correlation was found with molar depth and a medium positive correlation with each of canine depth, palatal width, and palatal length.

Determination of Mandibular Arch Form During Mixed Dentition Using Custom Made Template in Sulaimani Governorate

Objectives: The dental arch form and dimensions change continuously and systematically during human growth and development, but this decreases adulthood. During mixed dentition, changes in dental arch forms and the occlusion occur due to teeth movements and growth of the alveolar bone. Usually, changes in the mandibular arch are followed by changes in the maxillary arch. The research aimed to determine the most frequent mandibular dental arch form and its relationship with gender. 
 Methods: The mandibular arch forms of 115 schoolchildren with mixed dentition were examined using their dental casts. Adobe Photoshop© (21.0.0, 2019) program was used to construct a template from photographs of the casts and printed on transparent paper to overlay the casts. The data were collected and calculated using statistical software to determine the frequencies of different arch forms among the studied sample. 
 Results: The sample was composed of 61 males (53%) and 54 females (47%). The oval arch form was the most frequent type with 70 cases (60.9%), followed by the square arch form with 38 cases (33%), and finally the tapered arch form with 7 cases (6.1%). No significant relationship was found between the arch form and the gender of the participants. 
 Conclusions: Oval arch form was the most predominant type of arch form of the mandible in the mixed dentition, and there was no relationship with gender.

FEATURES OF OCCLUSAL CORRELATIONS OF MOLARS IN THE DENTAL CLINIC

The aim: To study the odontoglific and odometometric parameters of molar crowns of the upper and lower jaws in males and females. Materials and methods: To achieve the aim of the research was used odontoglyphic, odometometric and statistical methods of research. Results: We have found that male molars of the upper jaw are characterized by approximately the same ratio between the vestibular-palatal and mesial-distal diameters of the crown, so the teeth are square-formed. For female large angular teeth of the upper jaw the predominance of vestibular-palatal over mesial-distal diameters of the crown is characteristic, which results in an oval form of the teeth. On having analyzed the forms of the third lower molars, it can be affirmed that for this group of teeth various variational forms of crowns, from three- to five-tuber forms, are characteristic. Vestibular-lingual and mesio-distal sizes also vary according to the type of odontoglific pattern of occlusal crown surface. Conclusions: We consider it expedient to take into account the abovementioned characteristics of the masticatory surface of molars of the upper and lower jaws of male and female persons for the creation of qualitative orthopedic structures that would fully restore the masticatory function.

Сезонная стоянка русских переселенцев в Ишимской степи Шадринский Маслозавод

Purpose. The sites of the Russian colonization period continued to stay insufficiently known in Western Siberia. The author considers new materials of excavation of two Russian migrant dwellings for studying local and chronological dynamic of life-support. Results. This site was localized at the bank of Shadrinskoye Lake in the steppe region of Ishim River valley in the Western Siberia region. Buildings stood alone and were not synchronic. They were small in size – 10 m2 and 18 m2, of rectangular form, and of varying depth. They had plank floors, a gable roof and access to the lake. After the fire, a shallow half-dugout dwelling with a larger area was built in place of the deep dugout, which eventually burned down too. The iron axes, traces of drying of nets with sinkers arranged in the complexes, the bones of domestic animals and fish were found. It is interesting that the sinkers are of different forms: biconic, cylindrical, trapeziform with one hole and flat oval form without a hole. The last type was used with wrapped birch bark. Two pots looked like 18th century brown Russian professional pottery. Despite fishing of the habitants, the bones of animals from food leftovers show the developing cattle breeding with predominant livestock and pig breeding in the local community. The chronology of this site was defined based on the periods of function of iron axes with the wide and the rounded off blades, ceramic and adobe clay brick (which had not been imported until much later) at the beginning of the 18th century. Conclusion. The site is interesting as a source of the early stage of Russian development of Siberia and as an ordinary life-supporting complex. It shows the combination of production branches with the development in fishing and game bird hunting in their natural habitat in the ecological lake systems of the steppe zone. Fishing for smaller fish was conducted for the purposes of diversifying the food ration.

Non-Anchor-Based Vehicle Detection for Traffic Surveillance Using Bounding Ellipses

Cameras for traffic surveillance are usually pole-mounted and produce images that reflect a birds-eye view. Vehicles in such images, in general, assume an ellipse form. A bounding box for the vehicles usually includes a large empty space when the vehicle orientation is not parallel to the edges of the box. To circumvent this problem, the present study applied bounding ellipses to a non-anchor-based, single-shot detection model (CenterNet). Since this model does not depend on anchor boxes, non-max suppression (NMS) that requires computing the intersection over union (IOU) between predicted bounding boxes is unnecessary for inference. The SpotNet that extends the CenterNet model by adding a segmentation head was also tested with bounding ellipses. Two other anchor-based, single-shot detection models (YOLO4 and SSD) were chosen as references for comparison. The model performance was compared based on a local dataset that was doubly annotated with bounding boxes and ellipses. As a result, the performance of the two models with bounding ellipses exceeded that of the reference models with bounding boxes. When the backbone of the ellipse models was pretrained on an open dataset (UA-DETRAC), the performance was further enhanced. Several data augmentation schemes also improved the performance of the proposed models. As a result, the best mAP score of a CenterNet exceeds 0.95 when augmenting heatmaps with bounding ellipses.

Influence research of temperature heat treatment on the microstructure of alumina ceramics

The JSC "URIR named after A. S. Berezhnoy" developed and introduced the technology of highly refractory alumina extra-dense ceramics. It is known that, the structure and properties of alumina ceramics in many cases depend on the temperature of its heat treatment, the holding time at the final temperature, the thermal unit, and a number of other factors. In order to study the processes of structure formation during of heat treatment the microstructure of alumina ceramic samples of two compositions (composition 1 with a moisture content of 30 %, as well as with dispersing and hardening additives, and composition 2 with a moisture content of 20 % only with dispersing additive) which were made by slip casting aqueous alumina slips based on reactive alumina α–from with Al2O3 content over 99 %, specific surface ~ 9 m2/g by electron microscopic analysis was studied. It was established that, after heat treatment at 1000 °C the beginning of sintering and recrystallization of corundum grains are observed, after heat treatment at 1200 °C take place packing of structure and recrystallization of α–Al2O3. After firing at 1400 °C the microstructure of samples composition 1 is represented to a large extent by crystals of tabular corundum with a particle size ~ 0.5—5.5 μm, predominant — ~ 2.5—3.0 μm. After firing at 1400 °C the microstructure of samples composition 2 is represented — by individual particles of a rounded and oval form with a size of ~ 0.5—3.5 μm, predominant — ~ 1.5—2.0 μm which are interconnected by intercrystalline layers. The microstructure of alumina ceramic samples of both compositions after firing at 1500 °C is similar and is composed of recrystallized corundum grains with a size of ~ 0.5—5.5 μm, predominant — ~ 1.5—2.0 μm, among which there are also larger α–Al2O3 grains, with a size of ~ 2—8 μm. After firing at 1580 °C the microstructure of samples is represented by a dense fine-grained structure of well-formed practically defect-free corundum grains, with a size of ~ 0.5—3.0 μm, among which grains of ~ 5—10 μm.

GENDER FEATURES OF THE ALVEOLAR PROCESS OF THE UPPER JAW

The individual face shape, the ratio of its proportions, the articulation capabilities of each person to a significant extent depend on the characteristics of occlusion and occlusion, in turn, are determined by the size, shape and ratio of dental, alveolar and basal arches. Two of them - alveolar and basal - pass at the corresponding levels of the alveolar areas of the jaws, which means that it is almost impossible to correct them, therefore they play the role of landmarks for setting the dental arch during dental prosthetics. A full-fledged aesthetic and functional restoration of the maxillofacial region after prosthetics largely depends on the dentist taking into account the individual morphological characteristics of the jaws, their cellular areas and specifically the morphometric parameters of the collar and basal arches. In order to determine the possible variants of the shape of the alveolar and basal arches of the upper jaw and the patterns of their ratio during the routine dental examination, 55 people (27 men and 28 women) aged 21-60 years with preserved maxillary dentition were examined. It has been established that the alveolar and basal arches of the upper jaw can have the shape of five geometric shapes: an oval, a semicircle, an ellipse, a trapezoid or a square. In this case, the shape of the collar and basal arches can coincide or be combined in various combinations. The analysis of the obtained results showed that in men the alveolar arch most often had the shape of an oval (70%), in women - an oval or semicircle (43%, respectively). With the aim of possible variants of the alveolar and basal arches form determination and peculiarities of their correlation 55 individuals (27 men and 28 women) in age of 21-60 years with the preserved teeth row were examined during planned dental examination. All examined were patients of the “Dental clinic of dr. Dakhno” (Kyiv). Computer tomographic investigation was made to these patients according to medical indications, scanning was made parallely to the occlusal plane. Image reconstruction was conducted with the use of highly dimentional bone algorithm. Alveolar and basal arch form of the upper jaw were determined on the images. It was established that alveolar and basal arches of the upper jaw can have a form of five geometrical figures: oval, semicircle, ellipse, trapeze or square. Form of the alveolar and basal arches can match or can combine in different combinations. Received results analysis testified that alveolar arch has a form of the oval in men and oval or semicircle – in women. Basal arch in men also most frequently has a form of oval, less often – semicircle, square and trapeze. In women basal arch more often has a form of trapeze or semicircle, less often – oval or square. In men alveolar and basal arches form matched in 41% of cases, in women – only in 31% of cases among total amount of all examined individuals. Most often alveolar and basal arches matched in the form of oval and semicircle, only in one case arches of the trapeze form matched in man, in woman – square form. Maxillary alveolar and basal arches form variants analysis let to determine areas, where distance between alveolar crests was maximal. Most variable this index was in individuals with the oval form of the alveolar arch on the level of 16-26, 17-27 or 18-28 teeth. Peculiarities of the alveolar and basal arches form of the alveolar process of the upper jaw in male and female individuals are characterized with expressed individual variability. These peculiarities consideration during dental prosthesis let avoid series of complications connected with the pressure redistribution on the osseous tissue of the jaws during articulation.

Effect of salicylic acid foliar application on growth, glandular hairs and essential oil yield in Salvia officinalis L. grown under zinc stress

BackgroundGenerally, zinc (Zn) is an essential element and acts as a plant nutrient, but at higher concentrations, it is toxic. Higher uptake and translocation of Zn into plant tissues can cause serious physiological and biochemical alterations. However, salicylic acid (SA) is an endogenous regulator of growth and signaling molecule responsible for inducing environmental stress tolerance in plants. Therefore, spray application of SA could provide protection against several types of stresses such as Zn toxicity. In this context, the ameliorative effect of SA (0.5 and 1 mM) on Salvia officinalis L. under Zn stress (40 mM) was studied.ResultsZn stress decreased growth, chlorophyll content, essential oil yield and peltate glandular trichome density. This toxicity can be linked to a strong accumulation of Zn in the various parts of the plant. In addition, Zn stress disturbed nutrients assimilation (K, P and Ca). However, spray of SA, particularly at 0.5 mM improved all parameters studied under both Zn and normal conditions. The positive effects of SA under Zn stress condition may be due to the decrease of Zn accumulation in different parts of the plant. This decrease was accompanied by an increase in K, P and Ca content. In addition, the histological study of S. officinalis leaves showed the presence of two types of glandular hairs, the peltate and capitate glands. In the leaves of stressed plants, we noticed the presence of glands with deformations in the form of pockets in the number of one or more as well as the glands with an oval form. On the other hand, all these abnormalities glands were not detected in stressed plants that were sprayed with SA. Therefore, the absence of these anomalies under the effect of SA showed the remedial effect of this growth regulator.ConclusionThe findings of the present work suggest that spraying SA maybe useful for improving the plant growth in Zn-contaminated areas.

Modeling the dynamic bending of rigid-plastic fiber-reinforced laminated curvilinear doubly connected thin plates with free outer contour

A theoretical model of the dynamic bending of rigid-plastic hybrid composite, arbitrary curvilinear doubly connected thin plates is developed. Inner contour of the plate is simply supported or clamped and outer one is free. The plates are on a viscous basis and under the action of uniformly distributed loads of explosive type. The plates are laminated and fibrous, with layers arranged symmetrically with respect to the middle surface. In each layer the reinforcing fibers, made of different materials, are located in directions parallel or normal to inner contour of plate. The structural model of the reinforced layer considering the plane stress state in fibers is used. The equations of the dynamic deformation of plate and simple analytical formula for the limit load are obtained. Numerical examples are given for a fiber-reinforced four-layered curvilinear plate with a supported hole in the form of ellipse and super-ellipse at the same total amount of reinforcement.

COVID-19 and early-stage lung cancer both featuring ground-glass opacities: a propensity score-matched study.

BackgroundRadiological manifestations of coronavirus disease 2019 (COVID-19) featured ground-glass opacities (GGOs), especially in the early stage, which might create confusion in differential diagnosis with early lung cancer. We aimed to specify the radiological characteristics of COVID-19 and early lung cancer and to unveil the discrepancy between them.MethodsOne hundred and fifty-seven COVID-19 patients and 374 early lung cancer patients from four hospitals in China were retrospectively enrolled. Epidemiological, clinical, radiological, and pathological characteristics were compared between the two groups using propensity score-matched (PSM) analysis.ResultsCOVID-19 patients had more distinct symptoms, tended to be younger (P<0.0001), male (P<0.0001), and had a higher body mass index (P=0.014). After 1:1 PSM, 121 matched pairs were identified. Regarding radiological characteristics, patients with a single lesion accounted for 17% in COVID-19 and 89% in lung cancer (P<0.0001). Most lesions were peripherally found in both groups. Lesions in COVID-19 involved more lobes (median 3.5 vs. 1; P<0.0001) and segments (median 6 vs. 1; P<0.0001) and tended to have multiple types (67%) with patchy form (54%). Early lung cancer was more likely to have a single type (92%) with oval form (66%). Also, COVID-19 and early lung cancer either had some distinctive features on computed tomography (CT) images.ConclusionsBoth COVID-19 and early lung cancers showed GGOs, with similar but independent features. The imaging characteristics should be fully understood and combined with epidemiological history, pathogen detection, laboratory tests, short-term CT reexamination, and pathological results to aid differential diagnosis.

COMPARISION OF COMMRCIALLY AVAILABLE ARCHWIRES WITH NORMAL DENTAL ARCH IN A GROUP OF SAUDI POPULATION

The dental arch varies among races, population, and individuals. The principal goal of orthodontic treatment is to maintain the stability and aesthetics of the arch. It is crucial to preserve the patient’s original arch form during orthodontic therapy otherwise the probability of relapse will increase. Objectives: To determine the average dental arch form and size for Saudi adults and compare it with commercially available archwires. Materials and methods: Dental casts of 126 Orthodontically untreated individuals with normal occlusion were obtained. For each model, the arch form was determined, the intermolar width, inter-canine width, molar depth and canine depth were measured using a digital caliper with 0.001-0.02 mm accuracy. Arch form template(Orthoform TM; 3M) was used and 9 commercially available preformed maxillary and mandibular Ni-Ti arch wires were scanned. Measurements obtained from casts were first compared between genders, then compared with those of preformed ready-made commercially available archwires to determine which archwire has the shape that fits most accurately to the predetermined Saudi measures. Results and Conclusion: The most common form was ovoid (48.4%) followed by square (30.2%) and tapered (21.4%). No significant difference existed between male and female regarding the arch form. Comparing arch-perimeters, no significant difference existed between both gender in intercanine width &depth as well as intermolar depth only the intermolar width showed significant difference at (P≥0.05). The most compatible archwire to the population’s upper dental arch was Ortho organizer oval arch form II. While Dentaurum, Tensic-ideal arch was the most compatible archwire to the lower dental arch.

Increasing supporting rod porcelain isolate at electric power substations

Supporting rod insulation is intended for insulating and fastening cathode parts of electrical installations at electric power substations. The insulation is set at outdoor switchgear of substations as a part of the main switchgear equipment. During the operation, it is exposed to external atmospheric influences, mechanic and dynamic loads. Timely replacing supporting rod insulation significantly increases the reliability of the main substation equipment at electric power substations. There was considering a question about improving the reliability at transformer and traction substations, providing internal and external conditions affected the destruction of supporting rod porcelain insulation. It was determined that an important negative part of supporting rod porcelain insulation damage is sharp swings of ambient temperature, especially swinging values after 0 ºC. A model is suggested for applying a supporting rod porcelain insulator as an insulating body in the ellipse form. It was described the suggested device work. The temperature gradient was taken into account, which shows the intensity of the temperature changing, is a vector directed towards the increasing temperature. There is an equation of a temperature field, which describes a thermal state of the body and determines a degree of its heating. There is an analyzing interacting ratio of values of circle axis and oval from larger to smaller in the spatial positioning in power loads, comparing a section form. The calculation determined a post insulator in the ellipse form should be set in the way where the long axis will be compatible in the gradient direction of temperature for decreasing influences of heating to the minimal axis of the insulator.

Degraded functional structure of macroinvertebrates caused by commercial sand dredging practices in a flood plain lake

In parts of developing countries, the over-exploitation of sands from inland waters has led to serious environmental concerns. However, understanding of the impacts of commercial sand dredging on inland water ecosystem functions remains limited. Herein, we assess the effects of this activity on the functional structure of the macroinvertebrate community and its recovery processes based on a 4-year survey, in the South Dongting Lake in China. Our result showed a simplified macroinvertebrate functional structures within the dredged area, as evidenced by a loss of certain trait categories (e.g., oval and conical body form) and a significant reduction in trait values due to the direct removal of macroinvertebrates and indirect alternations to physical environmental conditions (e.g., water depth and %Medium sand). Moreover, clear increases were observed in certain trait categories (e.g., small body size and swimmer) resulting from the dredging-related disturbance (e.g., increased turbidity) within the adjacent area. Furthermore, one year after the cessation of dredging, a marked recovery in the taxonomic and functional structure of macroinvertebrate assemblages was observed with most lost trait categories returning and an increase in the trait values of eight categories (e.g., body size 1.00–3.00 cm and oval body form) within the dredged and adjacent area. In addition, dispersal processes and sediment composition were the main driver for the structuring of the macroinvertebrate taxonomic and functional assemblages during the dredging stages, whilst water environmental conditions dominated the taxonomic structure and dispersal processes determined the functional structure during the recovery stage. Implications of our results for monitoring and management of this activity in inland waters are discussed.

Radyolojik bulgularla submandibular bezde dev siyalolit: Olgu sunumu

<p class="ql-align-justify">A sialolith is defined as one or more calcific foci in oval or round form within a parenchyma or duct of a salivary gland. It is most commonly seen in the submandibular salivary gland and in the 30-60 age range. A 46-year-old male patient was admitted to the Department of Oral and Maxillofacial Radiology of Istanbul University Faculty of Dentistry for dental treatment.&nbsp;A panoramic radiography incidentally showed a radiopaque formation in the right mandible angulus. No symptoms were detected in the clinically relevant region. A cone beam computed tomography showed a mixed, hyperdense focus in the lingual area in the right angulus region and a sialolith was detected. On ultrasonography, a sialolith was found in submandibular salivary gland duct. Due to the absence of any symptoms, regular followup was provided. The determination of localization and size of the sialolith with clinical and radiographic findings are important in treatment planning. In this case report, we aimed to present the radiological findings of an asymptomatic case of a large sialolith.

Effect of Intersection Angle and Wettability on Droplet Generation in Microfluidic Flow-Focusing Device

Abstract This article investigates the dynamics of droplet generation process in a microfluidic flow-focusing device under the effect of geometry altered by the intersection angle (φ), which the flanking inlets make with central inlet and wall wettability quantified by the contact angle (θ) using volume of fluid (VOF) model. These parameters have been found to alter the droplet shape and size greatly. The effect of intersection angles has been examined for φ = 15 deg, 30 deg, 45 deg, 60 deg, 90 deg, and 120 deg for generating size-controlled droplets. It was predicted that the diameter of droplet increased with the increase in intersection angle (φ = 15 deg, 30 deg, 45 deg, 60 deg, 90 deg, and 120 deg) and the maximum diameter has been generated at φ = 90. In addition, the wetting characteristics (hydrophilic to hydrophobic) have been studied numerically in detail by changing the contact angle of the dispersed phase with the channel wall ranging from 90 deg to 180 deg. It was indicated that the droplets of rectangular shape are formed in hydrophilic channel by completely wetting the wall when θ ≤ 90 deg. They transform their shape to slightly oval form with the increase in contact angle and start acquiring spherical shape when the channel becomes hydrophobic. Furthermore, Parameters such as dimensionless droplet diameter, droplet shape, and droplet breakup time have also been investigated extensively for flowrate ratios Q = 0.125, 0.25, 0.5, and 1, in order to optimize the microfluidic device.