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The purpose of this work is to study the influence of the immersion temperature and the treatment time of the ion exchange of soda-lime glass in molten KNO3 bath on its mechanical properties, and in particular the erosion resistance using Sahara sand and alumina abrasives. EDS analysis showed that the depth of penetration of K+ into glass increases as temperature and treatment time increase. The effect of ion exchange temperature and time on mechanical reinforcement was studied by micro-indentation, scratch test, wear and erosion test. All of these mechanical properties are improved after ion exchange treatments; erosion and wear resistance behave the same, either by using natural abrasives such as Sahara sand or by using an aggressive abrasive as alumina grits. The increase in the ion exchange time induces an increase in Vickers hardness of about 15–40% compared to annealed glass. Samples processed at 520 °C for a short period of 2 h show better mechanical properties compared to samples processed at 480 °C for longer times. In this case, the sample has a higher surface density which made the glass in compression not only because the potassium ions occupy the ionic substitution spaces but also the free spaces.

Using the example of oil road bitumen grades BND 100/130, BND 130/200 and BND 70/100, this article studies the transformation of oil dispersed systems under various logistic schemes of operation. This research focuses on the influence of the conditions for storing road bitumens of different grades on their physical and mechanical properties and group hydrocarbon composition during transportation from the manufacturer to the consumer. The results show that a change in the physical and mechanical properties of road bitumens during high-temperature storage is related to the changes in the group hydrocarbon composition due to the hydrocarbons autooxidation and destabilization of the colloidal structure of dispersal systems. The conditions for storing bitumen with a minimum change in its quality indicators have been determined. It has been established that storage of bitumen under atmospheric conditions allows preserving its original properties without significant changes. There is evidence that nitrogen purging significantly reduces the effect of homolytic processes leading to the transformation of oil dispersed systems during further transportation from the manufacturer to the consumer. Experimental data confirm that of all basic physical and mechanical properties of bitumen, “the depth of penetration of needle” is the most sensitive index, while the “softening temperature” index, frequently used for quality control of bitumen, is inertial. Determining the change in penetration, depending on the duration of storing bitumen, has required formulating a special equation. It has been established that when storing road bitumen at a temperature of 180 ºС, for each hour the index of the penetration depth of the needle at 25 º decreases by 0.8 units. Organizational and technical measures have been determined to ensure the stability of the road bitumen quality during manufacture, storage and transportation to consumers.

The influence of a magnetic field on the stability of a shaped charge jet is experimentally investigated at standoffs of 490, 650 and 800 mm. The experimental results without and with the magnetic field are compared in terms of the shaped charge jet form, stability and penetration ability. A theoretical model based on one-dimension fluid dynamics is then developed to assess the depth of penetration of the shaped charge at those three standoffs and magnetic conditions. The results show that the penetration capability can be enhanced in more than 70% by the magnetic field. The theoretical calculations are compared with the experimental results with reasonably good correlation. In addition, the parameters introduced in the theory are discussed together with the experiments at three standoffs studied.

A new dimensional criterion is proposed for assessing the periodic processes of adsorption and desorption of gases, which represents the sorbate penetration depth into the adsorbent. Specific examples show the possibility of its application in preliminary calculations of pressure swing adsorption units for the adsorption drying of natural gas and for the production of oxygen.

Background Glenoid loosening is the most common complication of total shoulder arthroplasty (TSA) resulting in revision. Inaccurate reaming and thermal osteonecrosis from heat generated during the reaming process may contribute to TSA failure by creating a suboptimal bone-implant interface for osteointegration. This biomechanical study investigated the differences in depth penetration and heat generation of used community glenoid reamers in comparison to brand new reamers by using a clinically relevant force. Methods A MTS Servohydraulic machine was utilized to test new and used community glenoid reamers by applying the clinically relevant force of 54.7 N over a defined time. The depth of penetration was measured via the MTS machine and the thermal profile was obtained via an infrared camera. The used reamers were then set by the MTS machine to reach the same depth as the new reamers for all respective sizes while recording the force differential generated and capturing the thermal profile. Levene's F test for variance and a Welch t test for scale variables were performed via SPSS Statistics 24 software. Results At a constant force and time, the new reamers penetrated a greater depth (4.18 ± 2.17 mm) than the community used reamers (0.41 ± 0.22 mm), a difference of 3.80 mm ((95% CI, 2.23 to 5.31 mm), P Conclusion The sharpness of glenoid reamers varies in the community. In order to reach the necessary depth for adequate fixation of implants, orthopedic surgeons may be required to exert a substantially larger force when using dulled reamers in comparison to sharp reamers. As a consequence, the heat generated could increase the risk of thermal osteonecrosis resulting in glenoid loosening. To minimize these risks, strategies may be employed to measure reamer wear, track reamer usage for exchanges, or develop disposable reamer systems. Level of evidence Basic Science Study; Biomechanics

The influence of target thickness and solution treatment on the ballistic behaviour of AA7075 targets has been investigated by both numerical and experimental methods. In numerical simulation, the target thickness was varied from 19 to 26 mm and an Ogive nose shaped projectile of 7.62 mm diameter with inlet velocities ranging between 800–875 m/s was considered. In order to justify the numerical observations, high velocity ballistic experiments were conducted on AA7075-T651 and the solution treated plates of various thicknesses (12, 16, 18, 20, 22 and 25 mm). For this experimental study, a deformable form projectile with dimensions of 7.62 × 51 mm and an inlet velocity of 850 ± 20 m/s was used. Microstructures of ballistic test samples were analysed using an optical microscope. Numerical analysis using ABAQUS predicted the minimum thickness required to resist complete penetration to be 20 mm in the case of AA7075 plates in the T651 condition, while experimental results showed it to be 21 mm. In the case of AA7075 solution treated plates, numerical simulation analysis predicted the minimum required plate thickness to resist complete penetration to be 24 mm, while the experimental results showed it to be 23 mm. Post ballistic microstructure analysis revealed that there was no change in the microstructure in the AA7075-T651 condition plates. Solution treated plates showed deformation of grains nearer to the impact region with the formation of adiabatic shear bands. In the case of the T651 plate, the mode of fracture was brittle, resulting in splinters, whereas it was petalling in the case of the solution-treated plates. The numerically predicted depth of penetration on both targets was reasonably close to experimental results with an average of 4% error.

Objective: An endodontic sealer contributes in obtaining an appropriate seal for the root canal system by establishing an association between the root canal walls and coronal restoration thereby promoting healing. This present research intended to compare the penetrating capacity and to determine sealer/dentin interface among various endodontic sealers. Materials and Methods: Horizontally sectioned tooth samples were obtained at 3 and 5mm and randomly divided into three groups: Group I - Chemically cured (AH Plus) sealer; Group II - Dual cured (EndoREZ) sealer; Group III – BioCeramic Nano sealer (iRoot SP). All three groups were coated with their respective sealers and obturated using cold lateral compaction technique. The samples were observed using Confocal Microscope for penetrating capacity evaluation and reviewing of sealer/dentin junction at 3 and 5mm depth. The results were statistically analyzed using one-way ANOVA and Tukey's Post-Hoc method. Results: On depth of penetration evaluation, one-way ANOVA analysis showed Group II exhibited maximum depth of penetration in contrast to Group III and Group I. Group I showed the least average depth of penetration among the other two groups at both 3 and 5mm. On sealer/dentin interface evaluation at 3mm, Group II showed increased interface in comparison with to Group III and Group I. No statistical significance evident among the groups at 5mm. Conclusion: EndoREZ showed maximum depth of penetration in comparison with iRoot SP and AH Plus sealer at both 3 and 5mm. EndoREZ also showed significant sealer/dentin interface at the level of 3mm when compared to other sealers used. Keywords: Confocal Microscope, Depth of Penetration, Sealer/Dentin interface, Endodontic sealers.

The aim of this scoping review was to assess the extent of the literature on the use of LED therapy to treat synovial joint disorders. The JBI methodology for scoping reviews was followed. The databases used were PUBMED, EMBASE, Scopus, Web of Science, LILACS, PEDro, Cochrane Database, Google Scholar and ProQuest. To be included, studies should have used LED as therapy, and include at least one measure related to the structures of any synovial joint. The search strategy included all keywords and indexed terms identified in the articles. Studies in any language and in any year, whether published or not, were included. The analysis of the studies was carried out by two independent reviewers. Data were extracted from articles using a data extraction tool developed by the reviewers. After carrying out the definitive search and selection, 47 publications were included: 15 clinical trials, 8 clinical protocols, 12 animal studies, 4 in vitro studies and 8 reviews on the topic. Studies have shown great variability from the device and number of diodes used, to the parameters and dosimetry chosen. Some positive effects were observed: on cell proliferation (in vitro); on anti-inflammatory biomarkers (murine models) and on pain scale (clinical trials - TMD). Although, the cause of non-significant results in clinical trials was rarely discussed: depth of penetration, dosimetry, follow-up time? Thus, future studies should focus on answering more elementary aspects about the LED effect when used alone in different synovial joints.

Background Lung cancer is the greatest cause of cancer mortality in the United States, necessitating ongoing improvements in current treatment techniques. Photodynamic therapy (PDT) involves the interaction between a photosensitizer, light, and oxygen. The resulting release of reactive oxygen species causes tumor necrosis. It has been used as an endoscopic technique for the palliation of lung cancer. Porfimer sodium (Photofrin) is the only Food and Drug Administration–approved photosensitizer for PDT but has limited depth of penetration and produces prolonged skin phototoxicity. Multiple newer photosensitizers are in development, including PS785. The effectiveness of PS785 was compared with porfimer sodium in the treatment of human lung cancer xenografts in mice. Methods Human non–small cell lung cancer (NSCLC) xenografts were established in severe combined immunodeficient mice and grouped into small (3-5 mm) and large tumors (6-10 mm). PS785 or porfimer sodium was administered intravenously, and PDT was executed at 24, 48, or 72 h after injection. The primary endpoint was the delay of tumor regrowth after PDT. Results Porfimer sodium and PS785 produced statistically similar delays of tumor regrowth after PDT when small tumors were treated at 24 and 48 h. At 72 h, PS785 performed better in small tumors. However, for large tumors, PS785 produced no delay in tumor regrowth at any time point. Conclusions PS785 and porfimer sodium were able to effectively treat NSCLC to a depth of ≤5 mm. However, porfimer sodium was more effective in treating NSCLC tumors to a depth of 6-10 mm. Further efforts are required to produce photosensitizers that will facilitate PDT of larger tumors.

Hydraulic fracturing consists of a technique capable of stimulating oil wells that have suffered a decline in production over time. It also allows the production in reservoirs that have low permeability through the creation of a network of channels in the rock. In this context, this article aims to numerically simulate the hydraulic fracturing applied in a sandstone reservoir according to data extracted from an oil well located in the Aracaju City field of the Sergipe-Alagoas Basin. To complete this study, a geological model of the reservoir was generated. Subsequently, a fracture was created in the rock-reservoir in a controlled manner using the Perkins and Kern fracture model. Results show that the fracture takes a satisfactory proportion in the reservoir rock, reaching a depth of penetration equivalent to 695.7 meters.

A review of the present understanding on high-density bulk metallic glass (BMG) composites with a specific emphasis on their application in kinetic energy (KE) penetrators is presented. The paper deals with materials requirement for producing KE penetrator and the need to use high-density BMG to enhance the depth of penetration using the concept of “self-sharpening” behavior caused by shear band formation. The initial sections have been devoted to the description of different BMGs, their formability, processing and mechanical properties. This is followed by a brief account on the evolution of high-density BMG, their composites and their possible application in ammunition. Finally, the contribution of the present group in light of processing and evaluation of high-density BMG composites for above-mentioned application have been highlighted.

Background Previous studies have shown that the depth of cement penetration and the presence of radiolucent lines (RLLs) correspond with the risk of aseptic loosening in total knee arthroplasty, while others have found a correlation between the viscosity of the cement and the depth of cement penetration. We compared cement marketed as high-viscosity cement (HVC) with one marketed by the same manufacturer as low-viscosity cement (LVC). We hypothesized that no significant difference would be found in depth of penetration or presence of RLLs between the two cohorts. Methods The HVC (n = 50) and LVC cohorts (n = 50) were gathered from two sequential series of primary total knee arthroplasties using the same implants and cementing techniques. Depth of cement penetration and presence of RLL were measured in four tibial zones and were compared between cohorts. Results There were no cases of aseptic loosening in either cohort at a mean of 29 months. Mean maximum cement penetration in 3 of the 4 zones was >3 mm with both cements. There was no significant difference in maximum penetration in any zone between the two cements. There were fewer tibial radiolucencies with HVC than LVC. Conclusion These findings suggest that the marketing description of HVC or LVC is not necessarily a factor in cement penetration. The term high viscosity should not be used as a descriptor of cement that reaches dough phase more quickly, but rather cement that has a higher viscosity at its dough phase when it is typically applied.

Ceramics are the most typical difficult-to-machine materials for high-performance applications. The paper utilized AWJ to turn the alumina ceramics. A prediction model of the depth of penetration (DOP) after AWJ turning of alumina ceramic was established. The variation trends of predicted and experimental results with respect to process parameters were consistent. Within the range of this study, it may be stated that the developed model can achieve good predictions both qualitatively and quantitatively. The material removal mechanism of alumina ceramics turned by AWJ was also analyzed. The turned surface topography analysis showed that the main removal mechanism of alumina ceramics in turning was plastic shearing at a shallow nozzle tilt angle but brittle fracture at a larger nozzle tilt angle. Through the analysis of chip morphology during AWJ turning, it was proved that the removal mechanism of ceramics turned by AWJ was mixed (brittle fracture and plastic shear). Gained predicted model and material removal mechanisms will provide more details to understand and improve the AWJ turning technology.

The digital control of the latest nanosecond pulsed wave (PW) fibre lasers allows very high flexibility in controlling the application of the total energy to a workpiece, which brings several advantages to the joining process. By choosing different pulse shapes in different spatial profiles, it is possible to apply low energy per pulse with high precision and accuracy resulting in lower heat input. Since the energy of each pulse is insufficient to generate melting, these lasers operate at very high pulse repetition frequencies near continuous wave (CW) regime. Nevertheless, the peak powers of PW lasers are much higher than CW. In this research, the effect of peak power, pulse energy, pulse width, pulse repetition frequency and duty cycle has been studied. The experimental work was conducted in bead on plate of austenitic stainless steel to investigate the effect of laser on the weld geometry, i.e. depth of penetration and width. An empirical model, previously established for CW mode, which enables the achievement of a particular penetration depth independent of the beam diameter, was redesigned and tested for PW mode. The “pulse power factor model” allows the laser user to select a weld profile that meets certain quality and productivity requirements independent of the laser system. It was shown that identical depth of penetration but different weld metal profile can be obtained for a specific beam diameter for a range of different system parameters by keeping a constant trade-off between pulse power factor and interaction time.

Analysis of depth of penetration (DoP) experimental data of Dyneema® HB26 hard ballistic laminates is presented using an energy approach. Several DoP experimental parameters have been identified and calculated including the threshold velocity of penetration ([Formula: see text]), the characteristic time ([Formula: see text]), the DoP damping coefficient ([Formula: see text]), and the dynamic pressure per unit impact speed ([Formula: see text]). For the first time, a simple penetration model is developed from the energy approach to predict the projectile motion and penetration resistance force during depth of penetration experiments.

In this paper, the ballistic performance of AA6061-B4C surface composite targets fabricated by Friction Stir Processing (FSP) technique has been investigated. The paper is divided into two stages. ...

The present work analyses the effect of five types of oxide fluxes – SiO2, TiO2, CrO3, MnO2 and MoO3 – on the depth of penetration and pitting corrosion behaviour of UNS S32205 duplex stainless ste...

Aim The aim of this in vitro study was to estimate the penetration depth and fracture resistance of three different sealers and to verify the relationship between the penetration depth and fracture resistance. Materials and methods Sixty single-rooted teeth were selected and root canal preparation was done. After the instrumentation, the teeth were divided into three groups of 20 each. The groups were then obturated with gutta-percha (GP)-AH Plus sealer, Resilon-Real Seal, and propoint-bioceramic sealers, respectively. Ten teeth from each group were sectioned at three different regions (i.e., coronal, middle, and apical thirds of the root canal) and were viewed under a confocal microscope to determine the penetration depth of the sealer. The remaining samples were subjected to fracture resistance under a universal testing machine and the statistical analysis was done by using one-way ANOVA and post hoc Bonferroni tests. Results Propoint-bioceramic group showed the highest fracture resistance values followed by GP-AH Plus sealer and Resilon-Real seal groups with no significant difference noticed between them. Depth of penetration was greater for GP-AH Plus sealer, propoint-bioceramic, with no significant difference followed by the Resilon-Real seal group. Conclusion The newer obturating material propoint-bioceramic group showed a greater fracture resistance. No correlation could be established between the depth of sealer penetration and fracture resistance. Clinical significance Fracture resistance of tooth obturated with propoint-bioceramic sealer combination is significantly greater than GP-AH Plus and Resilon-Real seal combination, thereby showing propoint-bioceramic as a promising obturating material.

Preoperative imaging is a critical part of the multimodality treatment of colon and rectal cancer. Surgeons approach this imaging with a need to know critical details. With colon cancer, the predominant imaging modality is CT scan. CT provides information about local environment of the tumor, the global abdomen, and extra abdominal sites. With rectal cancer, MRI is the standard of preoperative imaging. MRI's high-resolution images and multiplanar evaluation of the pelvis allows accurate assessment of depth of penetration, nodal status and involvement of other organs. Understanding of relationships between tumor and mesorectum is critical to projecting therapies.

Microorganisms are the major cause for the failure of root canal treatment, due to the penetration ability within the root anatomy. However, irrigation regimens have at times failed due to the biofilm mode of bacterial growth. Liposomes are vesicular structures of the phospholipids which might help in better penetration efficiency into dentinal tubules and in increasing the antibacterial efficacy. Methods: In the present work, chlorhexidine liposomes were formulated. Liposomal chlorhexidine was characterized by size, zeta potential, and cryo-electron microscope (Cryo-EM). Twenty-one single-rooted premolars were extracted and irrigated with liposomal chlorhexidine and 2% chlorhexidine solution to evaluate the depth of penetration. In vitro cytotoxicity study was performed for liposomal chlorhexidine on the L929 mouse fibroblast cell line. Results: The average particle size of liposomes ranged from 48 ± 4.52 nm to 223 ± 3.63 nm with a polydispersity index value of

Welding is one of the ancient manufacturing technologies used for joining of parts. The technology is still applicable to meet various needs of industries, but of course with time-to-time amendments. With the passage of time, numerous scientific investigations has been carried out across the globe on welding technology to keep pace with the modern day requirements. Accordingly, numerous technological modifications and advancements have been suggested & incorporated into almost all the different types of existing welding techniques available, besides developing new techniques also. Metal inert gas (MIG) welding is one such type, which primarily falls under the domain of arc welding. In the present work, bead-on-plate weld beads have been prepared using MIG over austenitic stainless steel specimen (SS-202) using three different types of flux materials and the bead geometry. Results reflected that activated flux material has significant impact over depth of penetration, bead width, weld quality and hardness of welds.

Mechanical properties of welded joints are greatly affected by weld bead geometry. Reinforcement height, depth of penetration and weld bead width are considered to be extremely important factors of weld bead geometry. In this research work, the influence of input process parameters like welding current, welding voltage, welding speed and electrode angle on the depth of penetration, reinforcement height and weld bead width is investigated. This research work has shown that depth of penetration and weld bead width vary directly while reinforcement height varies inversely with welding current and also there occurs a direct relation of reinforcement height and weld bead width with welding voltage and inverse relation of depth of penetration with welding voltage. It has also revealed that depth of penetration varies directly with welding speed. On the other hand, reinforcement height and weld bead width vary inversely with welding speed. It was also observed that depth of penetration, reinforcement height and weld bead width are not affected considerably up to electrode angle of 10° but beyond 10°, depth of penetration and reinforcement height decrease and weld bead width increase. It is very important to establish a relationship between input process parameters and weld bead geometry for achieving good quality weldments.

This study aimed to comparatively evaluate the cell viability, flexural strength (FS) and depth of penetration following surface pretreatment of demineralized dentin with phytosphingosine (PHS) and...

The mechanical-metallurgical features of a weldment can be evaluated based on the establishment of a mathematical model with which the input and output variables relationship, and the optimal weld ...

This article investigates silver-palladium (AgPd) microelectrical contact coated with graphene (Gr). An analysis is carried out for 2-D, circle-rectangle microelectrical contact using COMSOL multiphysics finite element analysis (FEA) simulation software tool. Under applied force between 6 and $15~\mu \text{N}$ , mechanical performance parameters such as contact radius, depth of penetration, and contact pressure are obtained for AgPd uncoated microelectrical contact. The results are validated with the Hertz contact model. The analysis is also carried out for the AgPd microelectrical contact coated with graphene (Gr). The Gr coating thickness is varied between 5 and 10 nm, and better mechanical performance is obtained for lesser coating thickness. This result shows that Gr can be used as a coating and lubricant on AgPd for electrical contact applications.

Management of vascular malformations depends on the size, type, age of the patient, location, dissemination, and depth of penetration. Treatment options include propranolol, which reduces endothelial vessel proliferation, minimally invasive sclerotherapy to induce fibrosis, or surgery. In 1985, Valerian Popescu described a new approach to treatment consisting of intratumoral ligation by compartmentalization. This technique allows for high doses of the sclerosant agent to be delivered as systemic dissemination is restricted by a series of strangulating suture loops that divide the mass into segments. We describe the management and outcome of 2 patients who presented with vascular malformations in the orofacial region and were managed using a Popescu suturing technique. Vascular obliteration was achieved by a series of strangulating suture loops placed percutaneously throughout each lesion using a curved needle with a resorbable material (Vicryl; Ethicon, Somerville, NJ). The aim was to segment the vascular malformation into manageable sections for subsequent injection of a sclerosant. The compartmentalization also ensured that the sclerosant stayed within these compartments and was not washed out into the general circulation. Good esthetic outcomes were achieved in very visible areas such as the commissure and the vermillion border. In these areas, a surgical resection would have certainly caused a disruption of the esthetics of the lips and, in the second case, probably an alteration of function. Intratumoral ligation can be used safely to achieve control of vascular malformations with good esthetic outcomes.

The main factors of the process of diamond smoothing are considered in the work: the force of the contact interaction of the tool and the part in the deformation zone and the friction on the contact surface of the part and the smoother. The technique of analytical determination of the optimal smoothing force for the finishing-hardening treatment mode is presented. The calculated values were obtained for some characteristic grades of materials of small and medium hardness (≤ 210 HB, indenter radius 3.4 mm) and a number of hardened steels of high hardness (indenter radius 2.0 mm). The force values are also determined using expressions for the deformation component of the friction coefficient. A comparative analysis of the results indicates that the calculation options are adequate for practical purposes. On specific examples of processed materials, graphical dependencies are shown, which reflect the relationship between the coefficient of friction, including its deformation component, and the smoothing force. With an increase in the leveling force, the friction coefficient increases, this is explained by an increase in the depth of penetration of the diamond tip and, consequently, an increase in the deformation component. The depth of penetration of the indenter into the surface to be treated, and therefore the coefficient of friction during ironing, depends on the hardness of the material being processed. With increasing hardness, the penetration depth decreases, which leads to a decrease in the deformation component and in general the coefficient of friction. The friction coefficient is also affected by the radius of the working part of the tool, since the indenter penetration depth also depends on its value. The research results can be used in the development of technology for finishing and hardening diamond smoothing, the development of the process and its introduction into production.

Homicide by stab wound is common worldwide. However, the use of unusual edged weapons is rarely reported in the forensic literature. Here, we report two cases of homicide involving a Japanese sword, or katana, and a sickle. Both of these weapons can create either stab or incised wounds with some particularities. In our cases, characteristics of the external wounds, internal injuries, and the depth of penetration raised the possibility of an unusual weapon. Meticulous forensic examination of these injuries (morphological characteristics, depth of penetration, trajectories, and cut marks in the bone) may allow the forensic expert to determine the type of weapon used.

Made available in DSpace on 2021-06-25T10:36:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Fear of injection-related pain is a drawback to injectable therapy. Hypodermic injections are a cause for great anxiety and reduced adherence to the subcutaneous application of insulin for glycemic control in diabetics or in the treatment of multiple sclerosis, increasing the risk of complications and mortality. Injured or sick people have to undergo several daily injections, forcing them to rotate the veins and regions used to recover from the trauma caused by the perforation of the skin, tissue, muscles, veins, and arteries. People who suffer from type 1 diabetes mellitus (DM1) need to have their glycemic control 3 to 5 times a day and to take insulin up to 3 times a day. In both cases, the patient needs to perforate the skin. To quantify the pain perceived by the patients depends on the evaluation of each patient and therefore is subjective. This study aims to understand the application and self-application of hypodermic injections and decrease pain during its application and the phobia of the patient, following the reasoning that the lower the effort to penetrate the needle, the less trauma in the tissue and therefore the pain provoked. For that, it was analyzed how some of the characteristics of the needle can influence the sensation of pain in the injection. The needle penetration effort was measured in an artificial tissue (substitute skin model) for different cannula diameters, roughness, depth of penetration, lubrication, and angles of the perforating tip bevel. This study aimed to find alternatives to facilitate the application and self-application of hypodermic injections, increase safety and comfort, and reduce the pain intensity perceived by the patient. To do this, the bevel of needles used repeatedly was analyzed in the profile projector and SEM to verify the loss of the profile or the formation of burrs that could hamper the penetration or traumatize the tissue during the reuse of needles. It has also been mechanically analyzed, which can be done to prevent that the needles used in the subcutaneous application do not inadvertently reach the muscle. The greater penetration effort observed in the needles with greater angle of the bevel is responsible for the patient's perception of pain. Department of Mechanical Engineering (DEM) Feis University of State of Sao Paulo (UNESP) Department of Mechanical Engineering (DEM) Feis Unesp Department of Mathematics (MAT) Feis Unesp Department of Biofuels Araçatuba Technology College Fatec Department of Mechanical Engineering (DEM) Feb Unesp Faculty of Medicine Campus of Três Lagoas (CPTL) Federal University of Mato Grosso Do sul (UFMS) Department of Mechanical Engineering (DEM) Feis University of State of Sao Paulo (UNESP) Department of Mechanical Engineering (DEM) Feis Unesp Department of Mathematics (MAT) Feis Unesp Department of Mechanical Engineering (DEM) Feb Unesp

Operation of shaped charges with copper hemispherical liners of degressive (decreasing from top to bottom) thickness is experimentally studied. The velocity of the head of generated shaped-charge jets is determined along with how deep they penetrate a type-setting target made of steel disks and the sizes of holes made in the disks. The experimental data on an increase in the velocity and a decrease in the mass of the heads of shaped-charge jets, which occur with an increase in the difference in the thicknesses of the hemispherical liner at the apex and at the base are in good agreement with the results of numerical simulation carried out within the framework of a two-dimensional axisymmetric problem of continuous mechanics. According to the experimental results, the effect of technological manufacturing errors on the operation of these charges becomes stronger, which eliminates or significantly limits the increase in the penetrating action. In one of the versions of liners of degressive thickness, the depth of penetration of a target, which is average in two tests, increases by 7.5% as compared to the liner of constant thickness.

Adhesive sandwich structures with the honeycomb core of the metallic foil, polymeric papers and composites are widely and effectively used in the units of aerospace engineering and in the other industries owing to a number of undeniable advantages, including high specific strength and stiffness. In the process of designing and manufacturing of abovementioned structures, it is necessary to ensure high strength and reliability of the adhesive joint of the bearing skins and honeycomb core at a small area of their contact. The decisive factors influencing the bearing capacity of such joint are the technological parameters of the bonding process. Using the finite element modeling, the paper deals with the bearing capacity of the adhesive joint of bearing skins with the honeycomb core based on the aluminium foil and polymeric paper Nomex at transversal tearing for the key factors of the bonding process. The pattern of the adhesive joint failure (on the adhesive of honeycombs) has been revealed, depending on the depth of penetration of honeycombs ends in the adhesive, physical and mechanical characteristics of honeycombs, modulus of elasticity and tearing strength of the adhesive and thickness of the adhesive layer. Peculiar features of behavior of adhesive joints of the bearing skins with the honeycomb core based on the aluminium foil and polymeric paper Nomex under the load have been established, which should be taken into account in designing and manufacturing of honeycomb structures. The recommendations are given with regard to choosing of parameters of the process of honeycomb structure bonding, which allow providing with the acceptable accuracy the optimal depth of penetration of ends of the honeycomb core faces in the adhesive layer of specified depth.

Abrasivity is one of the most important properties in drilling and tunneling projects. This phenomenon, which increases costs and significantly reduces drilling efficiency, is quantified using various techniques. The Cerchar test (CAI) and the Rolling Indentation Abrasion Test (RIAT) are, respectively, one of the oldest and newest methods in this regard. In this new test, the weight loss (RIATa) and depth of penetration of the mini disc cutters into the sample (RIATi) are measured. In the present research, 18 sandstone samples were prepared and their petrography analysis were carried out as quartz percentage (Q%) and equivalent quartz content (EQC). Moreover, Cerchar abrasion index (CAI) for each sample was determined by the Cerchar test. Finally, the RIAT test was performed on the samples to determine their abrasion penetration rate (APR = RIATa/RIATi) and penetration time rate (PTR = RIATi/Time) as two new abrasion criteria. The results showed that there is an inverse significant relationship between APR and PTR. In addition, there was a significant and direct relationship between APR and Q%, APR and EQC, and APR and CAI. The quadratic and exponential models were identified as the most valid models. Overall, the relationship between PTR and Q%, PTR and EQC, and PTR and CAI is inverse, and exponential and inverse models are the most valid models. The results showed that Q%, EQC, and CAI can be considered for evaluating the disc cutters wear in the laboratory model. A comparison of the results of the present and previous study showed that the variations of APR–EQC, APR–CAI, PTR–EQC, and PTR–CAI were similar. The minor difference between the present and previous results is due to the mineralogical differences.

The aim is to carry out experimental studies of deepening the ripper's tooth in an array with different rates of deepening. Improving the process of the ripper by increasing the efficiency of deepening and deepening of the tooth from the array, which in turn will have a positive effect on the effectiveness of preparatory work. Methodology/approach. Experimental studies carried out the deepening of the ripper's tooth into the ground with different rates of deepening. Findings. Theoretically and experimentally proved rationality of using on the ripper of the developed design equipment, allowing to increase the speed of deepening of the ripper tooth. Research limitations/implication. An experimental bench was developed to determine the regularities of soil resistance in the deepening mode. The dependences of the resistance of the deepening of the ripper tooth depending on the depth of penetration are established. Originality/value. Analysis of the obtained dependences allows us to conclude that as the rate of deepening of the ripper tooth deepens into the ground, the resistance of the mail decreases, which in turn allows to achieve the greatest possible deepening.

Purpose: This study conducts an in vitro comparison of the depth of penetration of a resin infiltrant material (Icon), a two-step self-etch resin-based material (OptiBondTM XTR), and a solvent-free self-etch resin-based material (Bond-1SF) into white spot lesions (WSLs).Methodology: Through an in vitro clinical trial, a total of 60 human posterior teeth, free from caries, were collected. The buccal and lingual surfaces of each tooth were marked, resulting in a total of 120 samples of surfaces, which represented the operational sample size. The samples were randomly divided into four equal main groups (n = 30) according to the materials used. Group 1 (M1) was the control group. Group 2 (M2) was restored using Icon, Group 3 (M3) using OptiBondTM XTR, and Group 4 (M4) using Bond-1SF. Each group was divided into two equal groups (n = 15) according to the surface treatment, and the first group (W1) was subjected to surface treatment but the second group (W2) was not. The resin penetration depth was observed using confocal laser scanning microscopy.Findings: The highest penetration depth was recorded for Group 2 with surface treatment (M2W1), and the lowest was recorded for Group 4 without surface treatment (M4W2). An analysis of variance test revealed a statistically significant difference in the penetration depth of tested materials (p < 0.05).Conclusion: Icon shows the best penetration depth value in relation to WSLs, whereas Bond-1SF shows the worst. Surface treatment has a positive effect on the penetration depth of the resin-based materials.

BACKGROUND Atrophic scars cause significant patient morbidity. Fractional photothermolysis is one of the most effective treatment options used to resurface scars of different etiologies. AIMS To assess the efficacy and safety of different fractional ablative CO2 laser parameters in treatment of linear atrophic depressed post-traumatic facial scars in adult male patients. METHODS A prospective pilot study of 20 adult male patients (skin types Π- Ⅳ, aged 18-45) with post-traumatic atrophic linear scars were divided into 2 groups each comprising 10 patients receiving different fractional CO2 laser parameters. Both groups received 3 laser sessions, one month apart, and were followed for 2 months after the last treatment session. Clinical and histological assessments were done to all patients before treatment and 2 months after the last treatment session. Also, patient satisfaction and side effects were recorded. RESULTS The study showed statistically significant reduction in average scar volume in both groups (P

Due to less visibility, underground facilities such as sewer pipelines are subjected to degradation until a major failure occurs. So, leakage detection of deteriorated underground sewer pipes is necessary to prevent expensive rehabilitation costs. The major causes of the frequent occurrence of ground subsidence and sewer leakage are excessive use of groundwater, reckless exploitation of natural resources, etc. In this study, the aerial thermal imaging (ATI) technique has been used to identify the leakage points in sewer pipelines by analyzing surface thermal diffusion behavior of the ground surface. Leakage is suspected at points of anomalous temperature variation. Then, ground-penetrating radar and closed-circuit television surveys have been carried out to strengthen the suspicion of sewer leakage. Irregular, erratic parabolic-shaped lines are observed at the points where the leakage is suspected through ATI. Finally, the test-pit excavation and simple cone penetration tests have been carried out which confirms the sewer leakage points. The leakage points are confirmed by a greater depth of penetration. The results of the cone penetration test carried out in E-21 and 23-24 sewer pipelines show that the depth of penetration at the leakage points is about 35 cm, which is greater than the depth of penetration at other points. So, it can be concluded that the aerial thermal imaging technique is an effective method to predict leakage in deteriorated underground sewer pipelines.

In this study, the ballistic performance of Al6061-SiC functionally graded sandwich plate (FGSP) with varying number of layers and volume fractions was examined experimentally. For this purpose, the two outmost layers of the FGSP were designed to be aluminum and the volume fraction of remaining constituents was gradually changing in intermediate layers through the plate thickness. The specimen plates were manufactured via powder stacking-hot pressing method. Ballistic tests of specimens were conducted with a single-stage gas gun, shooting 0.3 caliber fragment simulated projectiles onto specimens. After the ballistic tests, deformation and damage mechanisms in the front and rear surfaces were examined and ballistic performance evaluation was carried out in terms of depth of penetration of the projectile measurements. Results showed that the composition of the projectile impact surface, which was beneath the top aluminum layer, had a considerable effect on ballistic resistance capability. A volume fraction of ceramic constituent greater than 60% in the projectile impact surface reduced the ballistic performance of the specimen. Likewise, a decreasing volume fraction of ceramic constituent of projectile impact surface below 60% increased projectile penetration. Furthermore, increasing the number of layers within the functionally graded region did not have a significant effect on the ballistic resistance of the FGSPs.

Cancer is of various kinds, so are the treatment modalities. Worldwide, cancer is the second leading cause of death, accounting for a whopping 9.6 million deaths in 2018. Globally, approximately one in six deaths is attributed to cancer. Photodynamic therapy (PDT) is a therapeutic strategy for the treatment of superficial lesions, warts, Barrett’s esophagus, premalignant lesions, malignant tumors, and ophthalmic diseases. The literature on PDT is approximately one-third of that in radiation therapy, yet the clinical implementation of PDT in cancer is relatively less. Despite substantial research, the clinical application of photodynamic strategy in cancer therapy is still in its infancy with only a limited number of case studies reported so far. The limitations of the photosensitizer and the shallow depth of penetration of light source are the key technical impediments. However, the use of nanomedicine in PDT can overcome these obstacles. Thus, it is necessary to gain knowledge on how nanomaterials can be merged with PDT and how it can be utilized in cancer theranostics. In this article, the focus is to understand how PDT works and how it can be utilized in improving the sensitivity of the existing diagnostic and therapeutic techniques. The article also addresses the current challenges for PDT and the future prospects of this technique, particularly in the area of diagnosis and treatment of cancer.

Intestinal endometriosis occurs in 4% to 37% of women with deep endometriosis (DE). Noninvasive diagnosis of presence and characteristics of rectosigmoid endometriosis permits the best counseling of patients and ensures best therapeutic planning. Magnetic resonance enema (MR-e) is accurate in diagnosing DE. After colon cleansing, rectal distention and opacification improves the performance of MR-e in diagnosing rectosigmoid endometriosis. MR imaging cannot optimally assess the depth of penetration of endometriosis in the intestinal wall. There is a need for multicentric studies with a larger sample size to evaluate reproducibility of MR-e in diagnosis of rectosigmoid endometriosis for less experienced radiologists.

Objective Fissure sealants hold a great significance in the preclusion of inception of caries process. The present in vitro study assesses the marginal sealing ability and penetration depth of various dental products used as pit and fissure sealants. Study design Sixty freshly extracted human non-carious premolars were arbitrarily categorized into four groups of 15 samples. Prophylaxis of occlusal surfaces of sample teeth was done with pumice slurry and sealant was applied. Later, the teeth underwent thermocycling and immersion in 5% methylene blue for 24 hours. Sectioning of teeth samples was done buccolingually and they were analyzed under stereomicroscope. Statistical analysis used Nonparametric tests Kruskal-Wallis and Mann-Whitney were applied to carry out microleakage comparison. The percentage penetration depth was compared using the one-way analysis of variance (ANOVA) test. Tukey's post hoc test was applied for multiple analogies. Results Highest microleakage was seen in glass ionomer-based sealant followed by flowable composite and least for classical sealant. Flowable nanocomposite gave comparable results with that of the classical sealant. No statistical difference was found with respect to depth of penetration between different tested materials. Conclusion Flowable nanocomposite can be considered as a promising substitute for sealing fissures and thus can be endorsed to caries-susceptible pediatric patients. How to cite this article Butail A, Dua P, Mangla R, et al. Evaluation of Marginal Microleakage and Depth of Penetration of Different Materials Used as Pit and Fissure Sealants: An In Vitro Study. Int J Clin Pediatr Dent 2020;13(1):38-42.

In the present work, an attempt has been made to study the effect of structural changes on the sustainable properties of needle punch nonwoven geotextile. There are two important process parameters, which influence the structure significantly. The parameters are punch density and depth of penetration of the needle. This research work is designed by considering the two parameters. Whereas, three-levels of each parameter taken and nine samples prepared by using two-factor three-level full factorial design. The structural analysis was carried out by an image analysis technique. All measured physical and mechanical properties of nonwovens have a strong correlation with the structural parameter. The significant effect noticed on fabric thickness, tensile strength, pore diameter, puncture resistance and impact resistance with the varying considered parameters; punch density and needle depth penetration.

The formation of hot cracks in the hastelloy X weldment is a major issue in the arc welding processes. This can be resolved by the proper selection of welding parameters and higher energy density methods like plasma arc welding. The keyhole plasma arc welding (K-PAW) of hastelloy X weldment was done using different welding speeds of 210 mm/min, 190 mm/min, 170 mm/min and 150 mm/min in a single pass. The welding of speed of 170 mm/min provided the highest aspect ratio compared to all other welding speed and the hot cracks were found at 150 mm/min is due to high input supplied at the lowest speed. The poor depth of penetration was found at the welding speeds of 210 mm/min and 190 mm/min, because of insufficient heat input available for keyhole to penetrate other side. The maximum Vicker’s microhardness was observed at the welding speed of 210 mm/min and lowest value is determined at 150 mm/min. Also, the results revealed that the value of microhardness is inversely related to the welding speed. The welding of 170 mm/min has given best quality of welding considering aspect ratio and near highest value of microhardness. It can be considered as the optimum welding speed for the welding of hastelloy X plate in K-PAW

The field of application of Functionally Graded Materialsis steadily expanding, which stimulates research in the relevant areas. In relation to penetration mechanics, these are primarily experimental studies of multilayer barriers consisting of plates “in contact” with various mechanical properties. Despite intensive research, explicit formulas for integral penetration characteristics (penetration depth and ballistic limit) cannot be obtained, except for the case when sequential penetration of layers (barriers with large gaps between layers). In this article, explicit formulas for the depth of penetration into an semi-infinite shield and for the ballistic limit velocity applying penetration into a shield of a finite thickness are derived assuming that the hardness of the barrier material varies continuously depending on barrier depth. The theoretical analysis is based on a model that represents the normal stress at points on the surface of the penetrating body that are in contact with the barrier as a quadratic function of the normal component of local impactor velocity with a zero linear term (the Vitman - Stepanov model). Difference of the dynamic hardness in different points of impactor-barrier contact is taken into account. It is also assumed that the nose of the striker has the form of a straight circular cone and the initial stage of penetration when the striker is not completely immersed in the barrier is ignored.

Background and aims. Pit and fissure sealant placement corresponds to an effective approach of the prevention of caries on occlusal surfaces. Fissure morphology and dental material characteristics are the key factors for sealant effectiveness. The aim of this in vitro study was to compare the penetration ability of two commercially available pit and fissure sealants. Methods. Twenty sound human premolars extracted for orthodontic purpose have been sealed according to manufacturer’s instructions as follows: Group I (n=10), light-cured unfilled resin-based sealant, Admira Seal® (Voco GmbH); Group II (n=10), resin modified glass ionomer sealant without varnish, GC Fuji Triage® (GC Corporation). The teeth have been sectioned buccal-lingually in the middle of the occlusal surface, and the sections were examined at 40x with an inverted microscope. Results. Penetration of the sealants was found to be greater in U-type fissure pattern (91.69%) followed by V-type (75.42%), IK-type (71.24%) and then in I-type (63.98%). The depth of penetration of GC Fuji Triage® (82.85%) demonstrated to be superior to Admira Seal® (76.28%). Conclusion. U fissure design was more common than other fissure patterns and showed significantly higher penetration for the two type of sealants evaluated. Resin modified glass ionomer sealant used in the present study perform comparably with the filled resin sealant.

Based on the characteristic expanded hole of a shaped charge jet (SCJ) for target penetration and the reflow characteristics of liquids, the liquid-filled structure of a target disturbs the stability of the SCJ acquired in two independent parts. The interference jet speed interval, the escape jet speed interval, and the surplus depth are calculated on the basis of the virtual origin theory. The experimental results, including the velocity of the escaped jet tip and the surplus depth of penetration, are consistent with the theoretical results. Experiments show that the theory can describe the interaction process of the target with a shaped charge jet. Keywords: Shaped charge, Liquid-filled structure target, Disturbed jet, Escape jet

The pre-construction works include the geotechnical investigation which comprises the surface and subsurface exploration. Sub-surface exploration often causes several difficulties such as high cost, time consuming, localized investigation and intrusive. Furthermore, investigation on soft soil such as peat often raises several additional problems such as high risk of sample disturbance, difficult access for heavy equipment and inconsistent data due to the heterogeneity of peat. The advancement of geophysical method such as Electrical Resistivity Tomography (ERT) allows the determination of soil profile in time-efficient manner, economic, larger volume of investigation and non-intrusive. This study focused on the determination of soil profile, particularly peat layer using ERT method with complement from peat sampler data. The study was conducted at Parit Nipah, Johor. The results revealed a high accuracy profile delineated by the ERT method with only less than 8% percentage of error as compared to peat sampler profile. The comparison between Schlumberger and Wenner array showed that; the Schlumberger showed superior depth of penetration, with almost 3 times deeper penetration relative to Wenner. The Schlumberger array is also able to delineate lateral variation within the peat layer. Finally, the resistivity value of peat obtained ranged from 100.8 to 139.5 ohm.m with both arrays having consistent results.

The study expressed the statistical investigation in depth of penetration on mild steel cladding weld geometry. The use of analytical tools and analysis of variance (ANOVA) were use to investigate the statistical influence of the mild steel cladding weld process parameters that gives rise to the geometry of the mild steel material. The results portray and express the statistical effects, variations and models of the process parameters and the response parameter in the system the parameters used are significant, while the model developed has a significance value of 0.48%. Finally, the need for this research has shown the essence of statistical investigation and mathematical modeling for depth of penetration on mild steel cladding weld metal geometry which give solutions to the system and more appropriate suggestions that will influence the decision making on mild steel metal utilization.

A reanalysis of experimental data from the RUssia-Nippon JOint Balloon (RUNJOB) emulsion experiment on the basis of a new method aimed at searches for primary galactic particles in events identified as those of nucleon-nucleus interaction confirmed the original result that consisted in the absence of a large number (about 50%) of tracks of incident particles. A comparative analysis of such events where there is a detected primary track and where there is no primary track was performed in terms of the energy, angular distribution, and depth of penetration into x-ray emulsion chambers (XREC). The hypothesis that a neutral component is present in cosmic rays at the XREC exposure level is discussed.

This study evaluates the effect of process parameters on depth of penetration and surface roughness in abrasive waterjet (AWJ) cutting of copper. Full factorial experiments are carried out on trapezoidal blocks for each of the three abrasive particle sizes used. Experimental parameters - abrasive mass flow rate, water jet pressure and traverse speed are varied at three levels. Main effects and contributions of process parameters to depth of penetration and surface roughness is calculated. From the data, it is observed that, high abrasive mass flow rate, high water jet pressure and low traverse speed resulted in higher depth of penetration and a high abrasive mass flow rate, high water jet pressure and low traverse speed resulted in lesser Ravalue. Using experimental data a statistical model for predicting depth of penetration & surface roughness is developed. Error between experimental and statistical values are compared to validate the statistical model. The maximum DOP of 49.32mm was observed at AMFR=405.4 g/min, P=300 MPa, TS=60 mm/min, MS=60 Mesh and minimum DOP of 4.27mm was observed at AMFR=200 g/min, P=100 MPa, TS=90 mm/min, MS=80 Mesh.