Portion Of Plate Research Articles

Mechanical behavior of buckling restrained steel plate shear walls with two-side connections

This paper theoretically studies the mechanical behavior of buckling restrained steel plate shear walls (BRSPSW) with two-side connections and various height-to-width ratios. A concept of boundary restraining region at the edges of steel plates is proposed. Due to the restraining from the boundary restraining region, the middle portion of the steel plate is in pure shearing which is equivalent to the BRSPSW with four-side connections. The stress development in the BRSPSW with two-side connections is studied and a simplified formula is deduced to determine its load-bearing capacity. The results show that the steel plate with a small height-to-width ratio (<1.5) has a middle shearing region and boundary restraining regions at the left and right edges with a width of 1/3 of the height of steel plate. No middle shearing region occurs in BRSPSW with large height-to-width ratios (⩾1.5). It is found that the yielding region in BRSPSW with small height-to-width ratios is in an I shape and has a flange height of 1/10 of the height of the steel plate. For BRSPSW with small height-to-width ratios, the beam connected to the steel plate is subjected to shear forces at the middle imposed by the shearing region of the steel plate, and tensile or compressive force at ends by the boundary restraining region of the steel plate. For BRSPSW with large height-to-width ratios, only vertical tensile or compressive forces are transferred from the steel plate to the beam. The accuracy of the proposed formula for calculating the load-bearing capacity of BRSPSW is verified by comparing the numerical results, since the differences are within 10%.

Sediments of the Dry Tortugas, south Florida, USA: Facies distribution on a ramp-like isolated carbonate platform

Four sedimentary facies may be delineated based on quantitative analysis of texture and composition of modern surface sediments on the Dry Tortugas carbonate platform. These include (1) mollusk-Halimeda wackestone, (2) mollusk packstone-to-grainstone, (3) coralgal-Halimeda grainstone, and (4) coralgal grainstone. Even though the Tortugas platform is characterized by an open circulation due to deep, broad marginal channels and a lack of a continuous surface-breaking marginal reef, facies are not distributed at random and show bathymetrical zonation. Also, facies appear to cover wide belts rather than forming a mosaic. Mollusk-Halimeda wackestone occurs in protected platform interior areas ca. 10–18m deep. Mollusk packstone-to-grainstone occurs in more open platform interior settings adjacent to channels and in deeper outer reef areas of 14–25m water depth. Coralgal-Halimeda grainstone is found on shallow marginal shoals (1–11m deep), and coralgal grainstone on the somewhat deeper (3–16m), seaward edges of these shoals. However, there is bathymetrical overlap of facies in intermediate depths of ca. 5–17m. This limitation has implications for the interpretation of the fossil record, because changes in water depth are commonly thought to be reflected in facies changes, e.g., in sequence stratigraphy. Comparison with previous sediment studies of the 1930s, 1960s, and 1970s in the area exhibit a decrease in coral fragments and increases in coralline algal and mollusk shell fragments. These observations might be a result of environmental changes such as coral decline and die-outs during temperature events, disease, and the increase in macroalgae (due to the ecological extinction of the echinoid Diadema). The results suggest that more long-term studies are needed that further explore the influence of environmental change on reef sediment composition. Dry Tortugas surface sediments consist of lower portions of Halimeda plates and mollusk shell fragments and higher percentages of coralline algal fragments as compared to sediments of the adjacent Florida Reef Tract, possibly as a consequence of differences in platform morphology and exposure to waves and currents.

Propagation of a strike-slip plate boundary within an extensional environment: the westward propagation of the North Anatolian Fault

We document the establishment of the Aegea–Anatolia/Eurasia plate boundary in Pliocene–Pleistocene time. Before 2 Ma, no localized plate boundary existed north of the Aegean portion of the Anatolia plate and the shear produced by the motion of Anatolia–Aegea with respect to Eurasia was distributed over the whole width of the Aegean – West Anatolian western portion. In 4.5 Ma, a shear zone comparable to the Gulf of Corinth was formed in the present Sea of Marmara. The initial extensional basins were cut by the strike-slip Main Marmara Fault system after 2.5 Ma. Shortly after, the plate boundary migrated west of the Sea of Marmara along the northern border of Aegea from the North Aegean Trough, to the Gulf of Corinth area and to the Kefalonia Fault. There, it finally linked with the northern tip of the Aegean subduction zone, completing the system of plate boundaries delimiting the Anatolia–Aegea plate. We have related the change in the distribution of shear from Miocene to Pliocene to the formation of a relatively undeforming Aegea block in Pliocene that forced the shear to be distributed over a narrow plate boundary to the north of it. We attribute the formation of this block to the northeastward progression of the oceanic Ionian slab. We propose that the slab cuts the overlying lithosphere from asthenospheric sources and induces a shortening environment over it.

고하중용 버킷 롤러체인 시스템의 다물체 동역학 해석 및 내구성 연구

In this study, multibody dynamic and mechanical analyses were conducted for the structure of roller chain bucket elevator system. The fatigue life of the roller chain elevator system was determined under static and fatigue loadings. Results of multibody dynamic analysis suggested that the maximum contact force occurred at the drive sprocket engagement point with the roller chain due to maximum tension. Fatigue analysis results suggest that the high load roller chain system is durable and safe because its life time is more than 700,000 cycles, close to its designed value (1,000,000 cycle). However, the contact portion of plate and pin needed a safety factor. The dynamic analysis of the heavy load roller chain was conducted with a multibody dynamic analysis program. The results obtained in this study can be utilized for dynamic analysis of roller chain systems in all industries.

Antiplane–inplane shear mode delamination between two second-order shear deformable composite plates

The second-order laminated plate theory is utilized in this work to analyze orthotropic composite plates with asymmetric delamination. First, a displacement field satisfying the system of exact kinematic conditions is presented by developing a double-plate system in the uncracked plate portion. The basic equations of linear elasticity and Hamilton’s principle are utilized to derive the system of equilibrium and governing equations. As an example, a delaminated simply supported plate is analyzed using Lévy plate formulation and the state-space model by varying the position of the delamination along the plate thickness. The displacements, strains, stresses and the J-integral are calculated by the plate theory solution and compared with those by linear finite-element calculations. The comparison of the numerical and analytical results shows that the second-order plate theory captures very well the mechanical fields. However, if the delamination is separated by only a relatively thin layer from the plate boundary surface, then the second-order plate theory approximates badly the stress resultants and so the mode-II and mode-III J-integrals and thus leads to erroneous results.

Spatio-temporal structure of vertically spreading flame over non-planar PMMA surfaces

Burning of PMMA slabs with non-planar surfaces is presented in this paper. Non-planar surfaces have been produced using steps fabricated in transparent thermally thick PMMA slabs. The step size is kept constant and three step locations have been used in this study. Either the plate portion or the step portion of the slab is ignited, but keeping the ignition location at the bottom. Concurrent flame spread over stepped slabs is analysed in detail. Time-dependent %mass loss, surface regression, and OH*, CH* chemiluminescence, and planar laser induced incandescence of soot and planar laser induced fluorescence of polyaromatic hydrocarbons (PAH) are determined. The results indicate that the main influence of the step at any location has been to increase the mass loss rate and therefore, the burning rate. The flow fields are quite different between the step ignition and the plate ignition cases. As a result, secondary flame zones are observed in the wake zone downstream of the step for step ignition cases and the flames influenced by stagnation point flow field are observed for plate ignition cases. The influences of step size for step ignition and location of step for plate ignition cases are also studied. The OH*/CH* maps show their overlap region as that of high heat release rates. The PAH precursor to soot is spatially mapped relative to the latter. Although the plate-injection cases are sooty, LII indicates otherwise because of poor mixing in a forward-facing step leading to substantial sooting above the sample outside the field of view. On the other hand, the effect of step recirculation zone in promoting mixing and suppressing soot is evident from the results.

Experimental tests and optimization rules for steel perforated shear panels

The paper presents the main results obtained downstream experimental and numerical study on steel perforated shear panels. Primarily, the response of the studied devices determined by cyclic tests is analysed. It is evidenced that the hysteretic performance of steel perforated shear panels might be detrimentally influenced by pinching effects and softening due to cumulated damage produced by lateral-torsion buckling that may arises when the plate portions delimited by contiguous perforations are excessively slender. Based on tests results, a suitable analytical formulation for the prediction of the strength at several shear demands, accounting for the influence of the above detrimental effects, is provided. Also, a parametric study based on a FEM numerical model calibrated on the basis of the experimental tests is developed. Two main goals are achieved: i) to establish the influence of the main geometric parameters on the panel hysteretic response, with particular regard to the pinching effects provoked by buckling phenomena; ii) to determine analytical formulations able to give back the ratio between the “pinching” strength and the maximum strength, the former being the force corresponding to a null shear strain in a cycle. Therefore a useful predictive tool for defining the optimal perforation geometry to be adopted as a function of the expected shear demand is provided.

Along-strike variation in subducting plate velocity induced by along-strike variation in overriding plate structure: Insights from 3D numerical models

Subduction dynamics can be understood as the result of the balance between driving and resisting forces. Previous work has traditionally regarded gravitational slab pull and viscous mantle drag as the main driving and resistive forces for plate motion respectively. However, this paradigm fails to explain many of the observations in subduction zones. For example, subducting plate velocity varies significantly along-strike in many subduction zones and this variation is not correlated to the age of subducting lithosphere. Here we present three-dimensional and time-dependent numerical models of subduction. We show that along-strike variations of the overriding plate thermal structure can lead to along-strike variations in subducting plate velocity. In turn, velocity variations lead to significant migration of the Euler pole over time. Our results show that the subducting plate is slower beneath the colder portion of the overriding plate due to two related mechanisms. First, the mantle wedge beneath the colder portion of the overriding plate is more viscous, which increases mantle drag. Second, where the mantle wedge is more viscous, hydrodynamic suction increases, leading to a lower slab dip. Both factors contribute to decreasing subducting plate velocity in the region; therefore, if the overriding plate is not uniform, the resulting velocity varies significantly along-strike, which causes the Euler pole to migrate closer to the subducting plate. We present a new mechanism to explain observations of subducting plate velocity in the Cocos and Nazca plates. These results shed new light on the balance of forces that control subduction dynamics and prove that future studies should take into consideration the three-dimensional structure of the overriding plate.

Tibial Plateau Leveling Osteotomy Plate Contouring and Proximal Load Screw Angulation Affect Osteotomy Compression.

To evaluate the effect of contouring a tibial plateau leveling osteotomy (TPLO) plate, the associated angulation of the dynamic compression plate (DCP) hole relative to the long axis of the tibia, and angulation of the screw relative to the DCP hole on the osteotomy compression generated by load screws in a TPLO model. In vitro biomechanical study. Polyoxymethylene (POM) rod and synthetic cortical bone substitute model (n = 9). The distal portion of a Slocum TPLO plate was attached to a horizontally positioned POM rod that was connected to a load cell. A segment of synthetic cortical bone substitute was attached to the end mount of the testing frame and adjusted to conform to the angle of the proximal portion of the TPLO plate. A 3.5 mm cortical bone screw was inserted in the proximal DCP hole and tightened to 1.5 Nm. The peak longitudinal load (N) was recorded. Screw insertion and data collection were repeated for proximal plate angles of 0-40° at 5° increments. A significant increase in the compression generated was observed as the plate angle was increased from 0° to 10°. The compression ceased to significantly increase until the plate was bent more than 20°, after which a significant decrease in compression was noted. A marked reduction in the compression generated occurred at plate angles greater than 30°. Angulation of the DCP hole and screw insertion angle can have deleterious effects on the magnitude of osteotomy compression.

"Retronychia--clinical and pathophysiological aspects".

Retronychia represents proximal ingrowth of the nail that occurs when the nail embeds backwards into the proximal nail fold. It is suspected when there is a persistent paronychia, particularly in the setting of trauma. Important clinical criteria for diagnosis are inflammation of the proximal nail fold, granulation tissue emerging from under the nail fold, thickening of the proximal portion of the nail plate and interruption of nail growth. The condition is rarely diagnosed and often misinterpreted, and is therefore unnecessarily treated with systemic antibiotics and antifungals. Avulsion of the nail confirms the diagnosis and it is the curative treatment. Conservative treatment with an adhesive technique is a valid option in early cases. We report 20 cases of retronychia diagnosed in our department between 2010 and 2013.

Progressive buckling of a simply supported delaminated orthotropic rectangular composite plate

In this work we analyse the buckling process of composite plates with trough-the-width delamination and straight crack front applying uniaxial compression. Local, global and mixed mode buckling cases are considered. The novel part of this work is that the distribution of the resulting in-plane forces is taken into account for the analysis of the buckling of the delaminated plate portions. For determining the behaviour of the delaminated plate with respect to the external compression, first an analytical method is given for determining the global critical loads. Second the local critical forces are determined using a finite element model. For this analysis a semi-discrete element was developed for the delaminated plate portions. The analysis was carried out using the method of harmonic balance because of the distribution of the in-plane forces along the delamination front. The buckling process of the plate with respect to the axial compression is determined from a displacement controlled model.

An upper mantle seismic discontinuity beneath the Galápagos Archipelago and its implications for studies of the lithosphere‐asthenosphere boundary

AbstractAn upper mantle seismic discontinuity (the Gutenberg or G discontinuity), at which shear wave velocity decreases with depth, has been mapped from S‐to‐p conversions in radial receiver functions recorded across the Galápagos Archipelago. The mean depth of the discontinuity is 91 ± 8 km beneath the southeastern archipelago and 72 ± 5 km beneath surrounding regions. The discontinuity appears deeper beneath the portion of the Nazca plate that we infer passed over the Galápagos mantle plume than elsewhere in the region. We equate the depth of the G discontinuity to the maximum depth extent of anhydrous melting, which forms an overlying layer of dehydrated and depleted mantle. We attribute areas of shallow discontinuity depth to the formation of the dehydrated layer near the Galápagos Spreading Center and areas of greater discontinuity depth to its modification over a mantle plume with an excess temperature of 115 ± 30°C. The G discontinuity lies within a high‐seismic‐velocity anomaly that we conclude forms by partial dehydration and a gradual but steady increase in seismic velocity with decreasing depth after upwelling mantle first encounters the solidus for volatile‐bearing mantle material. At the depth of the solidus for anhydrous mantle material, removal of remaining water creates a sharp decrease in velocity with depth; this discontinuity may also mark a site of melt accumulation. Results from seismic imaging, the compositions of Galápagos lavas, and rare‐earth‐element concentrations across the archipelago require that mantle upwelling and partial melting occur over a broad region within the dehydrated and depleted layer. We conclude that the G discontinuity beneath the archipelago does not mark the boundary between rigid lithosphere and convecting asthenosphere.

Effect of Bolts Assembly on the Deformation and Pressure Distribution of Flow‐Channel Plates in Micro‐PEMFC

AbstractThe main aim of this study is to simulate the response of a micro‐PEMFC numerically by utilizing a 3‐D FEM model while the micro‐PEMFC was assembled by three pairs of bolt along the upper and lower portions, respectively, of the end plates. The effects of different bolts locking sequences on the deformation and pressure distributions at flow‐channel plates in a micro‐PEMFC were investigated. The simulated results showed that if one locked the middle bolt either on the upper or lower portion first, then the obtained warpage, uniformities of deformation and von Mises equivalent stress were superior than those results if one locked either one of the four corner bolts first. Also, among the three pairs of bolts used for assembling the cell, the first locking bolt of the first pair of locking bolt and the first locking bolt of the rest of two pairs of locking bolt were to minimize the warpage and stress should locate on the different portions of the end plates.

Cretaceous metamorphism, magmatism and shearing in the Waipuna Valley, directly south of the Reefton Goldfield

Rocks in the Waipuna Valley in Westland show that the area immediately south of the Reefton Goldfield has been dramatically affected by Cretaceous tectonism. The main lithology in the Waipuna Valley is metasedimentary Greenland Group that is here subdivided into four types (I, II, III and IV). Type I contains abundant detrital grains with a weak Palaeozoic greenschist facies overprint and is compositionally indistinguishable from unmineralised Greenland Group within the goldfield. Type II contains detrital grains, but also a weak amphibolite facies foliation or, where proximal to granitoid intrusions, a hornfelsic texture. Type III contains no detrital components and records polyphase recrystallisation. U–Th–Pb monazite dating indicates that metamorphism in the Type III rocks occurred, at least in part, at 108.1 ± 1.2 Ma. Type IV Greenland Group has partially melted. Zircon from granitoids intruding Greenland Group in the Waipuna Valley indicate Cretaceous (c. 111 Ma) emplacement. Greenland Group Types III and IV, and the granitic plutons, have been variably sheared with quartz textures indicating progressive cooling during deformation. A mylonite zone occurs just above outcrop of the Type IV rocks. Field and age relationships are interpreted to show that the Waipuna Valley exposes portions of an upper plate and lower plate to a Cretaceous ductile shear zone that is here named the Waipuna Shear Zone. The overall structure is similar to the nearby Cretaceous extensional Paparoa Metamorphic Core Complex. The Reefton Goldfield lies in the upper plate to the Waipuna Shear Zone, not far above the mylonite zone. Cretaceous metamorphism and shearing of Greenland Group could have aided formation and then transport of gold-bearing fluids into structurally higher rocks.

The European Plate Observing System and the Arctic

The European Plate Observing System (EPOS) aims to integrate existing infrastructures in the solid earth sciences into a single infrastructure, enabling earth scientists across Europe to combine, model, and interpret multidisciplinary datasets at different time and length scales. In particular, a primary objective is to integrate existing research infrastructures within the fields of seismology, geodesy, geophysics, geology, rock physics, and volcanology at a pan-European level. The added value of such integration is not visible through individual analyses of data from each research infrastructure; it needs to be understood in a long-term perspective that includes the time when changes implied by current scientific research results are fully realized and their societal impacts have become clear. EPOS is now entering its implementation phase following a four-year preparatory phase during which 18 member countries in Europe contributed more than 250 research infrastructures to the building of this pan-European vision. The Arctic covers a significant portion of the European plate and therefore plays an important part in research on the solid earth in Europe. However, the work environment in the Arctic is challenging. First, most of the European Plate boundary in the Arctic is offshore, and hence, sub-sea networks must be built for solid earth observation. Second, ice covers the Arctic Ocean where the European Plate boundary crosses through the Gakkel Ridge, so innovative technologies are needed to monitor solid earth deformation. Therefore, research collaboration with other disciplines such as physical oceanography, marine acoustics, and geo-biology is necessary. The establishment of efficient research infrastructures suitable for these challenging conditions is essential both to reduce costs and to stimulate multidisciplinary research.

Non-steady-state subduction and trench-parallel flow induced by overriding plate structure

The direction of plate tectonic motion and the direction of mantle flow, as inferred from observations of seismic anisotropy measurements, show a good global correlation far from subduction zones. However, this correlation is poor near subduction zones, where below the slab seismic anisotropy is aligned parallel to the trench and above the slab has a complex pattern, which has not been fully explained. Here we present time-dependent three-dimensional (3D) fully-dynamic simulations of subduction to study the effect of overriding plate structure on the evolution of slab geometry and induced mantle flow. We find that along-strike variation in thermal thickness of the overriding plate causes increased hydrodynamic suction and shallower slab dip beneath the colder portion of the overriding plate; the variation in slab geometry drives strong trench-parallel flow beneath the slab and a complex flow pattern above the slab. This new mechanism for driving trench-parallel flow provides a good explanation for seismic anisotropy observations from the Middle and South America subduction zones, where both slab dip and overriding plate thermal state are strongly variable and correlated, and thus may be an important mechanism in other subduction zones. The location and strength of trench-parallel flow vary with the time-dependent evolution of the slab, suggesting that the global variability in seismic anisotropy observations in subduction zones is in part due to the non-steady-state behavior of these systems.

Bending solution of third-order orthotropic Reddy plates with asymmetric interfacial crack

In this paper Reddy’s third-order shear deformable plate theory is applied to asymmetrically delaminated orthotropic composite plates under antiplane–inplane shear fracture mode. A double-plate system is utilized to capture the mechanical behavior of the uncracked plate portion. An assumed displacement field is used and modified in order to satisfy the traction-free conditions at the top and bottom plate boundaries. Moreover, the system of exact kinematic conditions was also implemented into the novel plate model. An important improvement of this work compared to previous papers is the continuity condition of the shear strains at the interface of the double-plate system. Applying these conditions it is shown that the nineteen parameters of the third-order displacement field can be reduced to nine. Using the simplified displacement field the governing equations are derived, as well. The solution of a simply-supported delaminated plate is presented using the state-space model and the displacement, strain and stress fields are determined, respectively. The energy release rate and mode mixity distributions are calculated using the 3D J-integral. The analytical results are compared to those by finite element computations and it is concluded that the present model is the most accurate one among the previous plate theory-based approaches.

COMPRESSION DRIVER AND HORN STRUCTURE

A loudspeaker driver 100 with new horn throat configuration 120 has a phase plug summation plane radius that is also the effective throat of the driver. The selected plane “D” where the elements of the horn that provide directional information to the wave front are implemented is made part of the geometry of the magnetic return circuit back plate 108 . The portion of the back plate that is coincident with the selected plane “D” has a lumen or opening that is made equal to the radius of the circle defined by the phase plug summation plane. The geometry of the back plate's lumen controls projected sound's radiation pattern.

Idiopathic congenital true leukonychia totalis.

A 16-year-old male presented with white-colored fingernails since birth [Figure 1]. Toenails were normal. None of the family members were affected. Hematological investigations were normal. On cutaneous examination all finger nails were milky, porcelain white in color and smooth surfaced. No knuckle pads, palmoplantar keratoderma, or hearing loss was observed. General and systemic examination was normal. On clinical correlation, a diagnosis of idiopathic congenital true leukonychia totalis was made. Figure 1 Milky, porcelain, white-colored smooth-surfaced finger nails Leukonychia is the white discoloration of nail that loses its normal pink color, with disappearance of the lunula. It is the commonest chromatic abnormality of the nail apparatus. It is also referred to as white nail, milk spots, and fortune or gift spots. It is derived from the Greek word “leukos” means white and “onyx” means nail.[1,2] Leukonychia is classified as: [Table 1]. Table 1 Classification of leukonychia The proposed white discoloration of the nail is attributable to reflection of light from large keratohyaline granules present in the parakeratotic cells of the ventral portion of nail plate thus preventing the visualisation of normal vascular tissue underlying the nail plate.[2,3] Total congenital leukonychia is very rare hereditary condition in which all nails are milky white with an autosomal dominant inheritance but it can be autosomal recessive in few cases. Hereditary leukonychia involves whole nail plate as against acquired one which shows transverse or punctate leukonychia. Mutations in PLCD1 gene on chromosome 3p21.3-p22 was identified as cause of hereditary leukonychia. This PLCD1 gene is localized to nail matrix and encodes phosphoinositide specific phospholipase C delta 1 subunit which is important enzyme in phosphoinositide metabolism required for molecular control of color and growth of nail.[4] Leukonychia totalis is associated with multiple systemic diseases such as diabetes, liver cirrhosis, renal failure, cardiac failure, gall stones, renal calculi, duodenal ulcers, pili torti, trichilemmal cyst, sebaceous cyst, congenital hyperparathyroidism, Hodgkin's lymphoma, Leopard syndrome, epiphyseal dysplasia syndrome, Bart Pumphrey syndrome, mental retardation, etc., However, there are very few reports in the literature on sporadic congenital leukonychia totalis without any systemic abnormalities.[1,3] Treatment is usually supportive with detailed investigation to check for association of any systemic or genetic disorders.

COMPLETE PENILE DISASSEMBLY FOR ISOLATED EPISPADIAS REPAIR WITH MITCHELL-CAIONE TECHNIQUE: TWO CASES

Isolated male epispadias defect is present in 10% of cases of epispadias-exstrophy complex. Many surgical technique have been described for repair of male epispadias. The aim of surgical repair is to get cosmetically acceptable and functional penis with a ventrally located urethra opening at the tip of the glans and moreover to give the patient a urinary continence. Surgical repair of epispadias malformation remains debatable as evident by the different techniques adopted. We present two cases of our experience where we used the complete penile disassembly tecnique by Mitchell-Caione in wich we acts on the voluntary control of urination by the reapproximation of the muscular plane of pelvic diaphragm and elevator muscle around the posterior urethra reconstructed. Epispadias repairs was performed on two incontinent male epispadias patient, aged 2 to 3 years. Both cases were untreated. Complete disassembly of penil components was performed to the corporal attachments down to the horizontal branches of pubic bones. The corporal bodies and the glans were split on the sagittal plane according to Grady-Mitchell. The central portion of the urethral plate was preserved intact. An electric stimulator was used to identify and reapproximate at the midline the muscular fibers that constitute the periurethral muscular complex, as a part of the anterior perineal membrane. “Z plasties” were necessary according to initial urethral length and width: the urethra was reconstructed over a double catheters, using 5/0 polyglicolic acid interrupted sutures in a single layer. In one patient we sutured symphisis pubis opened precedently, using 1/0 polyglicolic acid. The urethra was placed ventrally in the reconstructed shaft under the two corpora as Mitchell technique. Glanduloplasty was then performed. Patients were followed up for one month (June 2012). The penis of the two patients had a satisfactory cosmetic appearance with no dorsal chordee. Morover, our patients obtained urinary continence. The limitation of our study was the low follow-up. The electric stimulator used to identify pelvic muscle components in the sagittal plane for reapproximate the posterior tabularized urethra to form the periurethral muscle complex and the “Z-plasties” that elongated the urethra significantly.This procedure seems to be satisfactory for the repair of cases of isolated male epispadias because we have good results in cosmetic appearance and in urinary continence. Our study is a preliminary report and a longer follow-up with a larger number of cases is needed to document further the success of the procedure.