Development of new metal structure for osteosynthesis of femoral fractures

2021 ◽  
pp. 7-13
Author(s):  
Sergey A. EMELYANOV ◽  
Anton N. PETRUKHIN
Keyword(s):  
Clinical Practice ◽  
Angular Displacement ◽  
Femoral Fractures ◽  
Steel Structure ◽  
Steel Structures ◽  
Metal Structure ◽  
Human Femur ◽  
Patent Search ◽  
Line Angle ◽  
The Subject

We presented the results of analysis of characteristics of osteosynthesis of femur model with improved metal structure. We carried out the analysis of the literature and a patent search on the subject of the study, created a layout of this design, a prototype and tested strength characteristics using a breaking machine. We carried out the work on a bovine femur preparation, performed taking into account the maximum correspondence of the studied human femur segment. We carried out load samples for fabricated steel structures, as well as for prototypes of this design in the form of samples for shear, angular displacement and rupture, while for each sample, performed 2 versions of the location of the steel structure relative to the fracture – perpendicular to the fracture line (angle 90º), as well as with a deviation in the range of 30º (75º–105º). We detected a statistically significant increase in the load values for the new advanced steel structure at a right angle of 41 % and a variation of 56 % during the analysis of the sample for rupture. Thus, when comparing the values of the load samples of the prototype and the manufactured metal structure, we revealed an increase in the indicators of the burst sample for the new metal structure which indicates the justification of its use in clinical practice.

scholarly journals Technical condition diagnostics and material testing of critical points of steel structure of rotary excavators and depositors

Tehnika ◽  
2021 ◽  
Vol 76 (4) ◽  
pp. 457-464
Author(s):  
Merim Aličić ◽  
Almis Aličić ◽  
Samir Softić
Keyword(s):  
Diagnostic System ◽  
Steel Structure ◽  
Steel Structures ◽  
Material Testing ◽  
Technical Condition ◽  
Open Pit ◽  
Coal Production ◽  
Surface Mines ◽  
The Subject ◽  
Continuous Work

In Bosnia and Herzegovina, significant coal production takes place in surface mines, which requires continuous work on the maintenance of machines and devices for surface exploitation. The complexity of the construction of rotary excavators, their high cost, and high costs of failure and maintenance, indicate the need for research and development of an efficient diagnostic system. The subject of research are the steel structures of three rotary excavators SRs 402 15 / 1.5 (piece 3) and the depositor A2RsB8500.60 (piece 1), which are in the process of coal production and overburden, at the open pit mine "Dubrave" in Dubrave JP Elektroprivreda BiH ZD Rudnici "Kreka" in Tuzla.

scholarly journals Feature of fire resistance calculation of steel structures with intumescent coating

2018 ◽  
Vol 230 ◽  
pp. 02036 ◽  
Author(s):  
Alexey Vasilchenko ◽  
Yuriy Otrosh ◽  
Nikolay Adamenko ◽  
Evgeny Doronin ◽  
Andrey Kovalov
Keyword(s):  
Fire Resistance ◽  
Steel Structure ◽  
Steel Structures ◽  
Metal Structure ◽  
Heating Time ◽  
Steel Frame ◽  
Frame Structures ◽  
Intumescent Coating ◽  
Intumescent Coatings ◽  
Steel Frame Structures

The problem of estimation of fire resistance of steel frame structures with intumescent coatings is considered. It implies that both physical properties of a covering (its thickness and structure) and mechanical properties of a metal structure change critically at heating. All above changes should be considered to maintain the standard values of fire resistance of a construction at calculation. Usually, known technical characteristics of fire resistance of intumescent coverings are used for estimation of fire resistance of steel structures with intumescent coverings. Importance of taking into account the influence of strength loss time at heating of a steel structure on calculation of fire resistance limit of system “intumescent fireproof coating steel structure” is shown in the article. On an example of calculation of heating time to the critical temperature of steel columns and beams protected by intumescent coating, it is shown that own heating time of steel structures before they lose strength makes 10 to 16 % from a settlement limit of fire resistance. This fact should be considered at the forecast of fire resistance of steel frame structures with intumescent coatings.

A view on Practical Utility of Paradi Gunas

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Sachin Bagali ◽  
Umapati Baragi ◽  
M. R. Sajjanshetti
Keyword(s):  
Clinical Practice ◽  
Professional Practice ◽  
Continuous Process ◽  
Clinical Activity ◽  
Successful Management ◽  
Knowledge Domain ◽  
Practical Utility ◽  
The Subject ◽  
The Way

In the present day scenario prime need of Ayurveda is practical applicability of Ayurvedic fundamental principles and research should be more focused on all aspects where scientific inputs should confirm Ayurveda’s principles and philosophy. In Ayurveda, Gunas are described as the way of presentation of action without which no Karma (action) can be possible. Ayurveda has provided significance to every Guna so that they become useful in clinical practice. Clinical practice or research is a continuous process including a series of events which need to be performed in a sequential manner. Though there are many factors on which accomplishment of treatment depends, among these Charaka has given prime importance to Paradi Gunas. In clinical practice, Guna which are to be with Bhishak are mainly the Paradi Gunas which can also be called as miscellaneous Gunas. As rightly quoted by Acarya Charaka, for getting success in the treatment Paradi Gunas are the best. The Sutra quotes "Sidhyupaya Chikitsayam" which means that Chikitsa i.e. Dhatusamya will be done mainly with the help of Paradi Gunas. Knowledge of Paradi Gunas are required to be present in pharmacists, physicians and Researchers. Acharya Charaka says that Chikitsa Siddhi i.e. successful management of disease is not possible without the knowledge of Paradi Gunas. Paradi Gunas play an important role in selection, adaption and manifestation of drug as per condition of the disease and the patient in particular Desha and Kala. The ultimate goal of any clinical activity is to contribute in the knowledge domain and to improve professional practice. Thus this literary review of Paradi Gunas serves to explore the subject of the clinical practice.

Dynamic Characteristics of Base-Isolated Steel Frame under Seismic Ground Motion

2011 ◽  
Vol 255-260 ◽  
pp. 2341-2344
Author(s):  
Mohammad Saeed Masoomi ◽  
Siti Aminah Osman ◽  
Ali Jahanshahi
Keyword(s):  
Ground Motion ◽  
Base Isolation ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Seismic Load ◽  
Vector Method ◽  
Seismic Ground Motion

This paper presents the performance of base-isolated steel structures under the seismic load. The main goals of this study are to evaluate the effectiveness of base isolation systems for steel structures against earthquake loads; to verify the modal analysis of steel frame compared with the hand calculation results; and development of a simulating method for base-isolated structure’s responses. Two models were considered in this study, one a steel structure with base-isolated and the other without base-isolated system. The nonlinear time-history analysis of both structures under El Centro 1940 seismic ground motion was used based on finite element method through SAP2000. The mentioned frames were analyzed by Eigenvalue method for linear analysis and Ritz-vector method for nonlinear analysis. Simulation results were presented as time-acceleration graphs for each story, period and frequency of both structures for the first three modes.

scholarly journals Experimental study on fatigue performance of Q420qD high-performance steel cross joint in complex environment

2021 ◽  
Author(s):  
Haigen Cheng ◽  
Cong Hu ◽  
Yong Jiang
Keyword(s):  
Fatigue Life ◽  
High Performance ◽  
Steel Structure ◽  
Steel Structures ◽  
Fatigue Tests ◽  
Fatigue Performance ◽  
Corrosive Media ◽  
Joint Connection ◽  
High Performance Steel ◽  
The Cross

AbstractThe steel structure under the action of alternating load for a long time is prone to fatigue failure and affects the safety of the engineering structure. For steel structures in complex environments such as corrosive media and fires, the remaining fatigue life is more difficult to predict theoretically. To this end, the article carried out fatigue tests on Q420qD high-performance steel cross joints under three different working conditions, established a 95% survival rate $$S{ - }N$$ S - N curves, and analyzed the effects of corrosive media and high fire temperatures on its fatigue performance. And refer to the current specifications to evaluate its fatigue performance. The results show that the fatigue performance of the cross joint connection is reduced under the influence of corrosive medium, and the fatigue performance of the cross joint connection is improved under the high temperature of fire. When the number of cycles is more than 200,000 times, the design curves of EN code, GBJ code, and GB code can better predict the fatigue life of cross joints without treatment, only corrosion treatment, and corrosion and fire treatment, and all have sufficient safety reserve.

scholarly journals A New Approach for Cylindrical Steel Structure Deformation Monitoring by Dense Point Clouds

2021 ◽  
Vol 13 (12) ◽  
pp. 2263
Author(s):  
Dongfeng Jia ◽  
Weiping Zhang ◽  
Yuhao Wang ◽  
Yanping Liu
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Point Clouds ◽  
Deformation Monitoring ◽  
Deformation Analysis ◽  
Relative Deformation ◽  
Structure Deformation ◽  
Single Time ◽  
Cylindrical Steel ◽  
Cylinder Fitting

As fundamental load-bearing parts, the cylindrical steel structures of transmission towers relate to the stability of the main structures in terms of topological relation and performance. Therefore, the periodic monitoring of a cylindrical steel structure is necessary to maintain the safety and stability of existing structures in energy transmission. Most studies on deformation analysis are still focused on the process of identifying discrepancies in the state of a structure by observing it at different times, yet relative deformation analysis based on the data acquired in single time has not been investigated effectively. In this study, the piecewise cylinder fitting method is presented to fit the point clouds collected at a single time to compute the relative inclination of a cylindrical steel structure. The standard deviation is adopted as a measure to evaluate the degree of structure deformation. Meanwhile, the inclination rate of each section is compared with the conventional method on the basis of the piecewise cylinder fitting parameters. The validity and accuracy of the algorithm are verified by real transmission tower point cloud data. Experimental results show that the piecewise cylinder fitting algorithm proposed in this research can meet the accuracy requirements of cylindrical steel structure deformation analysis and has high application value in the field of structure deformation monitoring.

scholarly journals Fracture fixation strategy and specific muscle tissue availability of neutrophilic granulocytes following mono- and polytrauma: intramedullary nailing vs. external fixation of femoral fractures

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
Johannes Greven ◽  
Klemens Horst ◽  
Zhi Qiao ◽  
Felix Marius Bläsius ◽  
Ümit Mert ◽  
...  
Keyword(s):  
Clinical Practice ◽  
External Fixation ◽  
Intramedullary Nailing ◽  
Muscle Tissue ◽  
Femur Fracture ◽  
Femoral Fractures ◽  
Pig Model ◽  
Minor Role ◽  
Neutrophil Granulocytes ◽  
Concomitant Injuries

Abstract Background In the stabilization of femoral fractures in mono- and polytrauma, clinical practice has shown better care through intramedullary nailing. However, the reason why this is the case is not fully understood. In addition to concomitant injuries, the immunological aspect is increasingly coming to the fore. Neutrophil granulocytes (PMNL), in particular next to other immunological cell types, seem to be associated with the fracture healing processes. For this reason, the early phase after fracture (up to 72 h after trauma) near the fracture zone in muscle tissue was investigated in a pig model. Material and methods A mono- and polytrauma pig model (sole femur fracture or blunt thoracic trauma, hemorrhagic shock, liver laceration, and femur fracture) was used to demonstrate the immunological situation through muscle biopsies and their analysis by histology and qRT-PCR during a 72 h follow-up phase. Two stabilization methods were used (intramedullary nail vs. external fixator) and compared with a nontraumatized sham group. Results Monotrauma shows higher PMNL numbers in muscle tissue compared with polytrauma (15.52 ± 5.39 mono vs. 8.23 ± 3.36 poly; p = 0.013), regardless of the treatment strategy. In contrast, polytrauma shows a longer lasting invasion of PMNL (24 h vs. 72 h). At 24 h in the case of monotrauma, the fracture treated with external fixation shows more PMNL than the fracture treated with intramedullary nailing (p = 0.026). This difference cannot be determined in polytrauma probably caused by a generalized immune response. Both monotrauma and polytrauma show a delayed PMNL increase in the muscle tissue of the uninjured side. The use of intramedullary nailing in monotrauma resulted in a significant increase in IL-6 (2 h after trauma) and IL-8 (24 and 48 h after trauma) transcription. Conclusion The reduction of PMNL invasion into the nearby muscle tissue of a monotrauma femur fracture stabilized by intramedullary nailing supports the advantages found in everyday clinical practice and therefore underlines the usage of nailing. For the polytrauma situation, the fixation seems to play a minor role, possibly due to a generalized immune reaction.

A Framework to Support the Optimization of Modularized Oil and Gas Structures

2018 ◽  
Author(s):  
Vincenzo Castorani ◽  
Paolo Cicconi ◽  
Michele Germani ◽  
Sergio Bondi ◽  
Maria Grazia Marronaro ◽  
...  
Keyword(s):  
Lead Time ◽  
Oil And Gas ◽  
Steel Structure ◽  
Steel Structures ◽  
Modular System ◽  
Test Case ◽  
Plant Design ◽  
Conceptual Study ◽  
A Current ◽  
Gas Plants

Modularization is a current issue in the context of plant design. A modular system aims to reduce lead time and cost in design phases. An oil & gas plant consists of many Engineered-To-Order solutions to be submitted and approved during the negotiation phase. In this context, design tools and methods are necessary to support the design life cycle from the conceptual study to the detailed project. The paper proposes an approach to optimize the design of modularized oil & gas plants with a focus on the related steel structures. A test case shows the configuration workflow applied to a modular steel structure of about 400 tons. The modularized layout has been optimized using genetic algorithms. A Knowledge Base has been described to support the configuration phase related to the conceptual design. Design rules and metrics have been formalized from the analysis of past solutions.

scholarly journals Evaluación del discurso narrativo en pacientes con daño cerebral leve

2012 ◽  
Vol 4 (3) ◽  
pp. 61
Author(s):  
Ana María Cachón
Keyword(s):  
Clinical Practice ◽  
Brain Injury ◽  
Single Case ◽  
Speech Analysis ◽  
Recovery Stage ◽  
Language Therapist ◽  
Speech Evaluation ◽  
Mild Brain Injury ◽  
Oral Speech ◽  
The Subject

In clinical practice there are few test that language therapist can use for the oral speech evaluation. The battery that has been frecuently used for the aphasia assessment, doesn´t usually give us this type of data, and when it happens, it is just a global description of the language of the subject, which doesn't make possible a detailed pursuit of the evolution. The relevance of linguistic production´s assessment becomes more evident in the study of patients with mild injury as well as when patient is in an advanced recovery stage. An assessment without a speech analysis uses to overestimate the subject's capacities and usually ends in an incomplete and inadequate intervention. The aim of the present work was to review different studies that include the narrative speech as part of the assessment, and to explore, with the study of a single case, some applications in this kind of studies for language evaluation in mild brain injury patients.

Solar Concentrating Systems Using Small Mirror Arrays

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Joachim Göttsche ◽  
Bernhard Hoffschmidt ◽  
Stefan Schmitz ◽  
Markus Sauerborn ◽  
Reiner Buck ◽  
...  
Keyword(s):  
Power Plants ◽  
Raw Materials ◽  
Large Fraction ◽  
Steel Structure ◽  
Steel Structures ◽  
Cost Effective ◽  
Wind Loads ◽  
Drive Systems ◽  
Mirror Area ◽  
The Cost

The cost of solar tower power plants is dominated by the heliostat field making up roughly 50% of investment costs. Classical heliostat design is dominated by mirrors brought into position by steel structures and drives that guarantee high accuracies under wind loads and thermal stress situations. A large fraction of costs is caused by the stiffness requirements of the steel structure, typically resulting in ∼20 kg/m2 steel per mirror area. The typical cost figure of heliostats (figure mentioned by Solucar at Solar Paces Conference, Seville, 2006) is currently in the area of 150 €/m2 caused by the increasing price of the necessary raw materials. An interesting option to reduce costs lies in a heliostat design where all moving parts are protected from wind loads. In this way, drives and mechanical layout may be kept less robust, thereby reducing material input and costs. In order to keep the heliostat at an appropriate size, small mirrors (around 10×10 cm2) have to be used, which are placed in a box with a transparent cover. Innovative drive systems are developed in order to obtain a cost-effective design. A 0.5×0.5 m2 demonstration unit will be constructed. Tests of the unit are carried out with a high-precision artificial sun unit that imitates the sun’s path with an accuracy of less than 0.5 mrad and creates a beam of parallel light with a divergence of less than 4 mrad.

Sign in / Sign up

Export Citation Format

Share Document