Triangular Area Research Articles

New data on neotectonic contractional structures in Precordillera, south of Río de La Flecha: Structural setting from gravity and magnetic data. San Juan, Argentina

The Central and Eastern Precordillera form oppositely verging thrust systems on the western and eastern sides of the Matagusanos-Maradona-Acequión valley, establishing a thick-skinned triangle zone with significant changes in the axis position along strike. Between the del Agua and the de La Fecha rivers, the axis of this triangular zone is located in the eastern portion of the depression. Changes in the position of the triangle zone axis along strike, whether to the east or to the west, took place during Pliocene–Pleistocene times. Geophysical and geodetic data indicate a subsurface structure striking NE, oblique to the general direction of the foreland with dextral displacement. Accordingly, the change in the location of the triangular area could be attributed to stress transfer controlled by heterogeneities in the basement. By analytic signal analysis of magnetic anomalies, it is possible to assess the regional structural coupling between Pie de Palo and Eastern Precordillera. The oblique arrangement of basement blocks could explain transverse lineaments and the sigmoidal geometry of the Eastern Precordillera. Geophysical and geological evidence shows that the depression is crossed by several E–W strike-slip faults. These faults possibly controlled the position of the triangle zone axis until Neogene–Pleistocene times by transferring displacements and provoking its jump along strike.Basement structures might have also played a primary role in the location of Quaternary faults trending N–S. Finally, the east–west cross-section geophysical model shows the triangular zone, responding to the different controls imposed by the pre-existing basement structures.

Mastoid Triangle for Sex Determination in AdultNigerian Population: A Validation Study

In the quest for a simple, reliable technique to estimate the sex of human remains several novel metric skeletal indices have been reported. Only a few have been examined for utility in populations different from those in which they were developed. In this study, the mastoid process was evaluated for sex determination using 102 lateral cephalograms of a Nigerian sample of known age and sex. The asterion-mastoidale distance and mastoid triangular area were sexually dimorphic with mean values higher in males compared with females (p = 0.02). On analysis of the discriminant function, overall accuracy for sex classification was 55%. On cross-validation, the triangular area accurately identified 80% of females and 48% of males. The asterion-mastoidale distance was slightly more accurate at sexing the sample. The practical utility of the mastoid triangle area technique to differentiate sex in Nigerian populations is not supported by the results of this study.

Ice nucleation by electric surface fields of varying range and geometry

Molecular dynamics simulations are employed to show that electric field bands acting only over a portion of a surface can function as effective ice nuclei. Field bands of different geometry (rectangular, triangular, and semicircular cross sectional areas are considered) all nucleate ice, provided that the band is sufficiently large. Rectangular bands are very efficient if the width and thickness are ≳0.35 nm, and ≳0.15 nm, respectively, and the necessary dimensions are comparable for other geometries. From these simulations we also learn more about the ice nucleation and growth process. Careful analysis of different systems reveals that ice strongly prefers to grow at (111) planes of cubic ice. This agrees with an earlier theoretical deduction based on considerations of water-ice interfacial energies. We find that ice nucleated by field bands usually grows as a mixture of cubic and hexagonal ice, consistent with other simulations of ice growth, and with experiment. This contrasts with simulations carried out with nucleating fields that span the entire surface area, where cubic ice dominates, and hexagonal layers are very rarely observed. We argue that this discrepancy is a simulation artifact related to finite sample size and periodic boundary conditions.

Osteitis Kondensans İlii’e Bağlı Bel Ağrısı

Osteitis Condensans Ilii (OCI) is a rare condition causing low back pain. It is generally seen in women related to pregnancy. Well defined triangular sclerotic area on the iliac part of the sacroiliac articulation can be seen on x-rays. The most accepted hypothesis is the extra mechanical loading of the sacroiliac joints leading to sclerosis during the pregnancy. The differential diagnosis between mechanical and inflammatory disease in patients with low back pain is usually difficult and the presence of sclerosis may be confusing. OCI is a benign form of sclerosis, not a form of inflammatory lesions. A case of woman with low back pain due to the OCI is presented. Physical and neurological examinations are unremarkable. The radiograph of the pelvis shows bilateral-symmetrical sclerosis localized to the lower part of the sacroiliac joints. This case report reviews the literature and mentions the main features and differentional diagnosis of OCI. (Turkish Journal of Osteoporosis 2013;19: 48-51)

The Interlaminar Stresses Analysis of Composite Laminated Plates Based on the Generalized Higher-Order Global-Local Plate Theory

A generalized higher-order global-local theory was presented. The transverse shear stresses can be got directly through the constitutive equation without using the equilibrium equation. The second derivative of interpolation function was deduced. The hammer integration of triangular area coordinate method was applied to solve the multiple integration problem of the element stiffness matrix. The order choice of numerical integration was discussed and results obtained through two different integration orders were compared. The flow of how to compile a FORTRAN program was given. A moderately thick composite laminated plate was analyzed via finite element method (FEM) based on the theory and results were compared with that of Paganos three-dimensional elasticity. It shows that the interlaminar stresses are accurate for moderately thick laminated plates.

Development of quadrilateral spline thin plate elements using the B-net method

The quadrilateral discrete Kirchhoff thin plate bending element DKQ is based on the isoparametric element Q8, however, the accuracy of the isoparametric quadrilateral elements will drop significantly due to mesh distortions. In a previouswork, we constructed an 8-node quadrilateral spline element L8 using the triangular area coordinates and the B-net method, which can be insensitive to mesh distortions and possess the second order completeness in the Cartesian coordinates. In this paper, a thin plate spline element is developed based on the spline element L8 and the refined technique. Numerical examples show that the present element indeed possesses higher accuracy than the DKQ element for distorted meshes.

The Study of Explicit Scheme of Hybrid Stress-Function Element with Rotation Degrees of Freedom

A simple and efficient explicit scheme of triangular planar element with rotation degrees of freedom is proposed in this paper. The basic fundamental solutions of plane elasticity problem based on Airy stress functions are used as trial functions to construct triangular element with drilling degrees of freedom. During the construction of element model, the explicit expression of element stiffness matrix is deduced by means of triangular area coordinates integration method, instead of numerical integration method. Numerical calculation indicates that the element constructed in this paper is of high precision but less computational cost.

Regional gray matter atrophy and neuropsychologcal problems in relapsing-remitting multiple sclerosis.

In multiple sclerosis, gray matter atrophy is extensive, and cognitive deficits and mood disorders are frequently encountered. It has been conjectured that focal atrophy is associated with emotional decline. However, conventional MRI has revealed that the pathological characteristics cannot fully account for the mood disorders. Moreover, there is no correlation between cognitive disorders and MRI results in clinically isolated syndromes or in cases of definite multiple sclerosis. In this case-control study, voxel-based morphometric analysis was performed on 11 subjects with relapsing-remitting multiple sclerosis, and the results show that these patients exhibit gray matter atrophy. Moreover, the gray matter atrophy in the superior and middle gyri of the right frontal lobe in patients with multiple sclerosis was correlated with scores from the Hamilton Anxiety Rating Scale. The scores obtained with the Repeatable Battery for the Assessment of Neuropsychological Status were associated with gray matter atrophy in the middle gyrus of the left frontal lobe, the superior and middle gyrus of the right frontal lobe, the middle gyrus of the left cingulate, the superior and middle gyri of the left frontal lobe, and the triangular area of the left frontal lobe. However, there was no statistical significance. These findings suggest that the cingulate and frontal cortices of the nant hemisphere are the most severely atrophic regions of the brain, and this atrophy is correlated with cognitive decline and emotional abnormalities.

KARAKTERISTIK DAN POTENSI PERKEMBANGAN KAWASAN KOMERSIAL SEGITIGA PANDAMA (PANDANARAN–GAJAHMADA–PEMUDA) DI KOTA SEMARANG

<p>Pandanaran, Gajahmada, and Pemuda (Pandama region) in recent years continued to experience growth in property investment, especially for commercial functions and show more rapid growth in the region. The growth phenomenon of the Pandama triangle areas as an investment destination and as a leading commercial center business is growing in line with the shift in the investment market (market force) that reacts to the many problems and limitations of Simpang Lima area as the destination investment CBD driven by previous Semarang Municipality. The research was carried out with quantitative approach to determine the characteristics and potential development of Pandama commercial areas in the future. Commercial activity in the Pandama triangle dominated by service function by 58% with the pattern of development and distribution of commercial activity in th triangle Pandama tends to change from a pattern that follows the road network (ribbon) to be concentrated pattern (center). Pandama triangular commercial area in the future will grow an develop as a magnet development in Semarang city and impact the higher quantity growth of the commercial activity and also lead to increasing the land conversion level of settlement into a commercial.</p>

Structural basis of harmomegathy: evidence from Boraginaceae pollen

Upon release from the anther, pollen grains can be exposed to dry environment and dehydrate. To survive in dry conditions, the pollen wall possesses the ability to fold itself due to water loss-harmomegathic mechanism. Apertures seem to function as the primary elements of harmomegathy as they are more elastic than the remainder of the pollen wall. Contribution of other sporoderm structures, surface features, and pseudocolpi in harmomegathy are usually not considered in palynological studies. The nature of pseudocolpi has not been properly understood until now, partly because of common use of acetolysis method as a standard procedure. Different structures involved in the harmomegathy mechanism were studied in Cryptantha celosioides, Cryptantha coryi, Heliotropium europaeum, Myosotis palustris, Rindera bungei, and Rindera tetraspis. Scanning electron microscopy was used to study harmomegathy in hydrated and dehydrated pollen grains. In addition, transmission electron microscopy was used to elucidate the ultrastructural basis of pseudocolpi and other harmomegathic structures with special attention to intine structure. Our data reveal that additional flexibility of the pollen wall in Boraginaceae is provided by pseudocolpi, rugulate surface, tectate–columellate ultrastructure, and a transverse groove. Curious triangular polar poroid areas are described in M. palustris.

Numerical study on the initiation of the severe convective weather in Chongqing on 6 May 2010

As a follow-up of a previously published article on the synoptic background of the development of the severe convective weather that happened in Chongqing on 6 May 2010, this study further examines the initiation of the severe convective weather via a better high-resolution simulation with the Weather Research and Forecasting (WRF) model. It is found that the cold front approaching Chongqing from the northwest played a critical role in the initiation of the severe convective weather. As the cold front approached Chongqing, the low-to-mid level updrafts ahead of the front acted to increase the atmospheric lapse rate via the stretching effect, which in combination with the low-level diabatic heating induced by the sensible heat fluxes and infrared radiation emitted from the ground surface led to the continuous decrease of the low-level static stability and the increase of the convective available potential energy (CAPE) in Chongqing area. This provided necessary unstable energy for the development of deep moist convection. Furthermore, along with the reaching of a nearly east-west-oriented mesoscale convergence line from the southeast of Chongqing, the outflow right above the cold front began to interact with that above the mesoscale convergence line and induced distinct convergence at the altitude of approximately 1–2 km in the triangular area sandwiched by the cold front and the mesoscale convergence line. It is found that the updrafts associated with this convergence provided lifting necessary for the initiation of the severe convection. The sensitivity experiment without the terrain west of Chongqing indicates that the local topography did not play an important role in the initiation of this severe convective weather.

VALIDATION METRICS OF THE MASTOID TRIANGLE

AbstractThe purpose of this study was to validate the technique developed by Paiva and Segre for sex identification using the mastoid process. Total mastoid area is calculated by adding the right and left triangular areas defined by three distinct craniometric points: the Asterion, Porion and the Mastoidale. Eight skulls (40 males and 40 females) were analysed and total area calculated using Heron's formula. The mean total area of the male skulls is higher compared to females (1461.06 mm2 vs 1222.79 mm2). Independent t-tests reveal that there are significant differences between males and females, with p-values less than 0.0001.

A 12-node Non-convex Quadrilateral Spline Element by Area Coordinates Interpolation

Isoparametric quadrilateral elements are widely used in the FEM. When using isoparametric element, a basic requirement is that the element has to be convex and a violent distortion is not permitted. In this paper, a 12-node non-convex quadrilateral element has been developed using the triangular area coordinates and the B-net method, which can exactly model the cubic field for both convex and concave quadrangles. Some appropriate examples are employed to evaluate the performance of the proposed element. The numerical results show that the spline element can obtain high accuracy solutions and insensitive to mesh distortions.

A new standard instrument arrival: the point merge system

PurposeThe purpose of this paper is to design a new standard instrument arrival called the point merge system (PMS) for converging runways. The PMS enables controllers to handle traffic with no heading instruction, as well as aiming to reduce a controller's frequency occupancy time.Design/methodology/approachThe point merge model was designed for converging runways. Istanbul International Ataturk Airport, which has converging runways, was chosen as an application area for this model. The same 50 traffic arrivals per hour were used both for point merge and vectoring. Implementation was compared using a real time simulation.FindingsThe simulation results show that the total average number of instructions is about 33 per cent less and the frequency occupancy is about 37 per cent less for point merge than for vectoring. In addition, in terms of trajectory dispersion, in point merge, traffic is within a narrower triangular area, while in vectoring large traffic dispersion occurs.Practical implicationsThe point merge model for converging runways proposed in this paper can be applied by airspace designers and air navigation service providers to perform efficient standard instrument arrival routes.Originality/valueThe PMS has been developed for single and parallel runways; however, in this study, the point merge model is designed for converging runways at Istanbul International Ataturk Airport.

Did China avoid the ‘Asian flu’? The contagion effect test with dynamic correlation coefficients

Many economists believe that China avoided the so-called Asian flu due to its strong balance of payments position and substantial foreign reserves. This study introduces an improved method for testing financial-crisis contagion and shows that crisis-contagion effects were significant among Thailand and the Chinese economic area (i.e. China, Hong Kong, and Taiwan) stock markets during the Asian financial crisis. The main contribution of this study is its use of a two-step procedure to identify the crisis dates for testing for contagion and data pertaining to a growing triangular economic area during the Asian financial crisis. This result suggests that if investors ignore the economic and financial information within regional markets, they will face an increase in uncertainty vis-à-vis investment returns.

Hemoptysis in a 39-year-old smoker

A 39-year old man, a smoker without significant medical history, presented with vague chest pain, cough, and hemoptysis. His symptoms had started 2 weeks earlier. Radiography showed an area of decreased lucency (ground glass appearance) in the right lower lobe. CT scan confirms the presence of a triangular area of inhomogeneous parenchymatous increased attenuation mainly of ground glass with inlying bronchocoeles and tree-in-bud appearance compatible with an intrapulmonary sequestration. The arterial supply is derived from the lower thoracic aorta. The venous drainage is to the left atrium. The hemoptysis is a result of a supratherapeutic International Normalized Ratio (INR) on Sintrom intake for atrial fibrillation (AF). Treatment of sequestration consisted of a thoracoscopic lobectomy.

Modeling of double diffusive buoyant flow in a solar collector with water‐CuO nanofluid

AbstractThe behavior of a prism‐shaped solar collector with a right triangular cross sectional area is investigated numerically. The water‐CuO nanofluid is taken as the functioning liquid through the solar collector. The leading differential equations with boundary conditions are solved by the penalty finite element method using Galerkin's weighted residual scheme. The performance of parameters in terms of temperature, mass, velocity distributions, radiative, convective heat and mass transfer, mean temperature and concentration of nanofluid, mid height horizontal‐vertical velocities, and sub‐domain average velocity field are investigated systematically. These parameters include the Rayleigh number Ra and the solid volume fraction φ. The outcome explains that the performance of the solar collector can be enhanced with the largest Ra and φ. The code validation shows excellent concurrence with the hypothetical outcome obtainable in the literature. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21039

Standardization of laparoscopic pelvic examination

To propose a novel standardized and reproducible system to be used for reporting positive and negative findings during diagnostic and operative laparoscopy based on anatomical landmarks. Video presentation of clinical article. The video uses animation and surgical cases to demonstrate a systematic examination of the female pelvis based on anatomical landmarks to establish a standardized way of reporting. Tertiary care referral center. Not applicable. Not applicable. Not applicable. This video demonstrates a proposal to standardize laparoscopic pelvic examinations. The pelvis is topographically divided into two midline zones (zone I and II) and two paired (right and left) lateral zones (zone III and IV). Zone I is the area between the two round ligaments from their origin at the uterine cornua to their insertion in the deep inguinal rings. Zone II is the area between the two uterosacral ligaments from their origin from the back of the uterus to their insertions in the sacrum posteriorly. Zone III is the area between the uterosacral ligament inferiorly and the entire length of the fallopian tube and the infundibulo pelvic ligament superiorly. Zone III contains the tubes and the ovaries. Zone IV is the triangular area lateral to the fallopian tube and the infundibulo pelvic ligament and medial to the external iliac vessels up to the round ligament. This system is based on standardized anatomical landmarks. It is user friendly, reproducible and allows systemic search of the pelvis to document the presence or absence of any pathology. It could improve diagnostic accuracy, help diagnose lesions in anatomically challenging locations, and provide the required standardization with its clinical and academic advantages. Video is available at http://fertstertforum.com/bedaiwym-standardization-laparoscopic-pelvic-examination/.

Safety Area for Proximal Metatarsal Procedures

Forefoot and tarsometatarsal surgery may be performed on the first and second metatarsal through the intermetatarsal space. However, no study has identified the safety area of the proximal metatarsal bone to avoid vascular injury. One hundred and twenty-two uninjured embalmed feet of 31 female and 33 male cadavers aged 15 to 91 years (mean, 69.9 years) were studied. The dorsalis pedis artery was identified and dissected from its origin to the deep plantar artery. The distances from the artery to the dorsomedial aspect of first metatarsal bone, from the artery to the first tarsometatarsal joint, and from dorsalis pedis artery to the most plantar surface of second metatarsal bone were measured. The distance from the artery to the first tarsometatarsal joint averaged 23.1 mm (range, 12-31 mm) and the distance from the artery to the most plantar surface of the second metatarsal bone averaged 6.3 mm (range, 3-13 mm). The safety area for proximal metatarsal procedure is about a 69-mm(2) triangular area (23 mm from first tarsometatarsal joint and 6 mm from the most plantar surface of the second metatarsal bone). The study provides information of normal location and variation of deep plantar artery is which related to medial midfoot complex. This information may be used during proximal metatarsal procedures.

Experimentally Based Theoretical Arguments that Unruh’s Temperature, Hawking’s Vacuum Fluctuation and Rindler’s Wedge Are Physically Real

The objective of the present paper is to argue that based on the reality of the observed increased rate of cosmic expansion, Unruh’s temperature, Hawking’s negative vacuum energy and Rindler’s wedge must also be a physical reality. We present first a brief derivation of the missing dark energy density of the universe which is in absolute agreement with the most recent accurate cosmological measurements and observations. The derivation is based upon a Rindler space setting, the associated wedge horizon and Unruh temperature. That way the topological ordinary energy is found to be half of the topological Unruh fluctuation mass m(O) = φ3 multiplied with the square of the topological speed of light c2 = φ2 where φ = 2 /(√5+ 1). This is exactly equal to the area of the spear-like hyperbolic triangular part of the Rindler wedge. The corresponding physical ordinary energy density is thus E(O) = (1/2)( φ3)( φ2) mc2 = (φ5/2)( mc2), where φ5 is Hardy’s probability of quantum entanglement. The topological dark energy density on the other hand is equal half of the topological Kaluza-Klein five dimensional mass m(D) = 5 multiplied with c2 = φ2. This in turn is exactly equal to the circular segment part of the wedge which together with the hyperbolic triangular entangled area forms the complete Lorentzian invariant triangular area of the wedge. Consequently the physical dark energy density which is uncorrelated, i.e. disentangled is given by E(D) = (1/2)(5)( φ2)( mc2) = (5 φ2 /2)( mc2) in full agreement with observation. Adding E(O) and E(D) one finds E(Einstein) = mc2 in full agreement with all our previous derivations. From the above we argue that since measurements, observations and theory have shown the increased expansion to be real and because the present derivation of the same results is based on Rindler’s space and Unruh’s temperature, it follows as a logical necessity that Unruh’s temperature, Hawking’s fluctuation and Rindler’s wedge are all physically real and can be measured, at least in principle.