scholarly journals The control of the mass of an aggregates deliveries and its impact on the effectiveness of earthworks execution

2018 ◽  
Vol 27 (3) ◽  
pp. 280-290
Author(s):  
Hubert Anysz ◽  
Wojciech Rogala
Keyword(s):  
Confidence Level ◽  
Estimation Error ◽  
Site Conditions ◽  
Construction Site ◽  
Under Construction ◽  
Optimal Quantity

An essay presents the method and tool which can be used to control the mass of aggregates deliveries under construction site conditions. The method based on statistics allows determining the optimal quantity of transports to be inspected, required to estimate the total sum of loose materials deliveries assuming estimation error and confidence level conditions. Inspection based on described method allows to improve the effectiveness of earthworks execution as well as gives the possibility to evaluate the quality of the supplier.

Research on Construction and Function of Safety Monitoring Sys- tem for Integrated Construction Site Based on BIM

1970 ◽  
Vol 1 (1) ◽  
Author(s):  
Dan Xin
Keyword(s):  
Monitoring System ◽  
Safety Management ◽  
Safety Monitoring ◽  
Information Collection ◽  
Construction Site ◽  
Management Efficiency ◽  
Lack Of Information ◽  
Safety Monitoring System ◽  
And Function

The effective construction of safety monitoring system at construction site depends on perfect management system and advanced technical support. And the lack of information technology platform, resulting in reduced management efficiency, information is not accurate and other issues. Based on the construction site safety monitoring system to achieve the goal, to do a good job in advance prevention, to take the latest information collection technology RFID and BIM integrated comprehensive and effective monitoring of the construction site, constitute the main technology in the monitoring system, thus ensuring the construction site safety monitoring efficiency , Comprehensive, real-time, etc., on the management and technical two points to achieve the construction site safety monitoring, improve the quality of safety management.

scholarly journals QUALITY PREDICTION OF DENSE POINTS GENERATED BY STRUCTURE FROM MOTION FOR HIGH-QUALITY AND EFFICIENT AS-IS MODEL RECONSTRUCTION

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 95-101
Author(s):  
R. Moritani ◽  
S. Kanai ◽  
H. Date ◽  
Y. Niina ◽  
R. Honma
Keyword(s):  
Structure From Motion ◽  
Point Clouds ◽  
Quality Prediction ◽  
Construction Site ◽  
Model Reconstruction ◽  
High Quality ◽  
Bridge Column ◽  
Dense Point ◽  
Selection Of

<p><strong>Abstract.</strong> In this paper, we introduce a method for predicting the quality of dense points and selecting low-quality regions on the points generated by the structure from motion (SfM) and multi-view stereo (MVS) pipeline to realize high-quality and efficient as-is model reconstruction, using only results from the former: sparse point clouds and camera poses. The method was shown to estimate the quality of the final dense points as the quality predictor on an approximated model obtained from SfM only, without requiring the time-consuming MVS process. Moreover, the predictors can be used for selection of low-quality regions on the approximated model to estimate the next-best optimum camera poses which could improve quality. Furthermore, the method was applied to the prediction of dense point quality generated from the image sets of a concrete bridge column and construction site, and the prediction was validated in a time much shorter than using MVS. Finally, we discussed the correlation between the predictors and the final dense point quality.</p>

scholarly journals The Quality of Accruals and Earnings: The Role of Accrual Estimation Errors

2002 ◽  
Vol 77 (s-1) ◽  
pp. 35-59 ◽  
Author(s):  
Patricia M. Dechow ◽  
Ilia D. Dichev
Keyword(s):  
Estimation Error ◽  
Cash Flows ◽  
Empirical Measure ◽  
Earnings Persistence ◽  
Working Capital ◽  
Estimation Errors ◽  
Accrual Quality ◽  
Flows Over Time

This paper suggests a new measure of one aspect of the quality of working capital accruals and earnings. One role of accruals is to shift or adjust the recognition of cash flows over time so that the adjusted numbers (earnings) better measure firm performance. However, accruals require assumptions and estimates of future cash flows. We argue that the quality of accruals and earnings is decreasing in the magnitude of estimation error in accruals. We derive an empirical measure of accrual quality as the residuals from firm-specific regressions of changes in working capital on past, present, and future operating cash flows. We document that observable firm characteristics can be used as instruments for accrual quality (e.g., volatility of accruals and volatility of earnings). Finally, we show that our measure of accrual quality is positively related to earnings persistence.

Preliminary examinations aiming at confirming presence of human blood in biological traces by means of mRNA analysis

2017 ◽  
Vol 295 ◽  
pp. 70-79
Author(s):  
Marta Gorzkiewicz ◽  
◽  
Małgorzata Grabowska ◽  
Tomasz Grzybowski ◽  
◽  
...  
Keyword(s):  
Human Blood ◽  
Genetic Material ◽  
Mrna Analysis ◽  
Species Specific ◽  
Additional Reference ◽  
Mrna Markers ◽  
Optimal Quantity ◽  
Validation Experiments ◽  
Gene Mrna

The aim of the project was to develop a specific and at the same time economical method for detecting human blood in biological traces based on analysis of haemoglobin mRNA with use of PCR reaction in real time and non-specific SYBR Green detector. The test, which has eventually been developed enabled simultaneous analysis of melting curves for three fragments of various lengths: HBB61, HBA197 and HBB503, as well as an additional reference gene: mRNA β-actin. A definite identification was possible already for 0,1 μl of blood. The method is tissue and species specific. The analysed mRNA markers are characterized by high stability, as compared to haemoglobin detected by standard methods. The result of mRNA profiling shows the predictive value as regards quality of genetic material and occurrence of mixture of liquids. Results of analyses performed during the project indicate potential usefulness of HBB and HBA1 markers in routine forensic genetic examinations. However, it is necessary to carry out a broader spectrum of validation experiments, and particularly to analyse a larger number of actual biological casework and precisely determining an optimal quantity of RNA and identifying ontogenetic differences in the levels of expression.

scholarly journals Analysis of the aerial application of fertilizer and dolomitic limestone

2010 ◽  
Vol 56 (No. 2) ◽  
pp. 47-57 ◽  
Author(s):  
M. Bošeľa ◽  
V. Šebeň
Keyword(s):  
High Variability ◽  
The Other ◽  
State Enterprise ◽  
Lower Amount ◽  
Site Conditions ◽  
Spruce Forest ◽  
Dolomitic Limestone ◽  
Aerial Application ◽  
Norway Spruce Forest

The paper evaluates the quality of revitalization treatments (fertilization and liming) carried out in selected areas within Forests of the Slovakia (state enterprise) during the year 2008. Revitalization treatments were carried out in declining Norway spruce forest stands in different site conditions. Full-scale aerial technology (helicopter and crop duster) was applied. The aim of the study was to find out the total amount and its variability of both fertilizers and dolomitic limestone after their application. The analyses revealed significant differences between the amount of fertilizer and dolomitic limestone which was applied to selected areas and the required amount (norm). As for fertilization, the largest difference was found in magnesium (Mg) on Šaling area (the amount of magnesium reached only 7% ± 0.5 of the norm) and in zinc (Zn) on Ľadová area (only 8% ± 1 of the norm). The required amount according to the norm was approximately met in boron (B) on Ľadová area (65% ± 10 of the norm). Yet, a significantly lower amount of fertilizers than the required one was revealed on all selected areas. After the application of dolomitic limestone to Liptovská Teplička area the significantly lower amount than the required one was found out (72% ± 12 of the norm). On the other hand, the significantly higher amount of dolomitic limestone than the required one was determined on Smolník area (143% ± 27 of the norm). Results also show the huge spatial variability of both fertilizers and dolomitic limestone on all selected areas (from 40% up to 100% between collecting places, and up to almost 170% between collectors within the collecting places). Such high variability of applied fertilizers and dolomitic limestone and the lower total amount than the required one will influence the effect of revitalization treatments.

scholarly journals Robotic Plug-in Combined Charging System with Improved Robustness

Proceedings ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 11
Author(s):  
Josef Cernohorsky ◽  
Pavel Jandura
Keyword(s):  
Image Processing ◽  
Inertial Sensor ◽  
Mobile Platform ◽  
Depth Image ◽  
Charging System ◽  
Internal Parameters ◽  
Six Dof ◽  
Under Construction ◽  
Conventional Solution

This paper describes the development of an algorithm robotic plug-in of a charging system for mobile platform. In the first chapter, there is a short overview of possibilities of automatic plug-in system, including proprietary industrial solution. In the main part, there is a description of the system based on UR robot with build-in force torque sensors and Intel RealSense Camera. This camera combines IR depth lens with regular RGB camera and six DOF inertial sensor, which is used in our application too. The conventional solution of this problem is usually based on RGB image processing in various state of the art, from simple pattern matching, neural network, or genetic algorithm to complex AI solution. The quality of the solution mostly depends on robustness of image processing. In our cases, we use simple sensor fusion. Thanks to multiple information and constrain of values, we can assume, if the algorithm is proceeding successfully or not. The system uses the internal parameters of the robotic arm, e.g., end-effector position and orientation and force-torque information in tool center point. The next information is RGB camera image and camera depth image, and the inertial unit build in camera. The other important information is the location of the vehicle inlet on the mobile platform, where the shape of mobile platform is considered as a constrain for image processing. The system is validated only on a physical model with CCS type 2 plug and vehicle inlet, because the mobile platform is under construction by another team.

scholarly journals Confidence Level and Ability of Medical Students to Identify Abdominal Structures After Integrated Ultrasound Sessions

2020 ◽  
Vol 06 (01) ◽  
pp. E7-E13
Author(s):  
Fauzia Nausheen ◽  
Corey Young ◽  
John Brazil ◽  
Timothy Dunagan ◽  
Renu Bhupathy ◽  
...  
Keyword(s):  
Medical Students ◽  
Physical Examination ◽  
Confidence Level ◽  
Vena Cava ◽  
Abdominal Ultrasound ◽  
First Year ◽  
Portable Ultrasound ◽  
First Year Medical Students ◽  
Ureteric Jet

AbstractDetermine the confidence level and ability of first year medical students to identify abdominal structures using a wireless portable ultrasound scanner.The students were assessed for their confidence and ability to perform abdominal ultrasound. The 5-point Likert survey included questions on their perception about ultrasound as a resource for learning anatomy, physical examination skills, and the quality of the pre-session instructions. Data was also recorded by the faculty about the students’ ultrasound skills and confidence. Goodman and Kruskal's gamma was used to demonstrate an association between the students’ ability to identify the structures and the self-reported student confidence level. Most of the students had confidence and were able to identify the liver, kidney, and urinary bladder, while almost half of them needed faculty help them to identify the inferior vena cava and aorta. The spleen and gall bladder were the most difficult to locate even for the very confident students. The perception of supervising faculty was that the confidence level was low in most of the students and only 13–20% of students felt “very confident” about performing ultrasound. Almost 37% needed encouragement and support and almost 10% of the students were not willing to try to locate difficult organs. Some students started locating the ureteric jet and portal vein. Most of the students agreed that ultrasound is an excellent resource for learning anatomy and physical examination skills. All students suggested having more ultrasound sessions. Most of the students feel confident about performing ultrasound and they perceive that ultrasound can enhance their basic sciences and physical examination skills.

A finned-riser design to avoid the capillarity effect in multi-jet fusion technology

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mattia Mele ◽  
Giampaolo Campana ◽  
Gian Luca Monti
Keyword(s):  
Analytical Model ◽  
Dimensional Accuracy ◽  
Measuring System ◽  
Original Design ◽  
Heat Management ◽  
Convex Shape ◽  
Content Type ◽  
Riser Design ◽  
Under Construction

Purpose Multi-jet fusion (MJF) process is based on a polymeric powder bed that is heated and irradiated by infra-red lamps. The layer under construction is jetted with inks to provide the desired heat management conditions for selective melting. Depending on several process variables, manufactured parts can exhibit lifting of the borders of the top surface of the shape under construction. This phenomenon is related to the capillarity effect. As a result, the top surface of MJF-manufactured parts can present a peculiar convex shape. This study aims to propose a solution that instead induces the capillarity effect outside of the part under construction. Design/methodology/approach A specific design is developed to avoid the capillarity effect in MJF. It is based on an analytical model that was previously developed by the authors to estimate the shape and extent of the capillary on top surfaces of benchmark components. The proposed methodology is established by the predicted calculation of maximum values of capillarity rise and length, and safety factors. A fin-shaped geometry is designed to avoid the capillarity effect. An experimental campaign is implemented to verify the effectiveness of the proposed solution. Prototypes are manufactured by an HP MultiJet 4200 in the original design and the so-called finned-riser design, by adding a well-dimensioned appendage on the top surface to shift the capillarity effect outside the border of the part under construction. Measurements are done by a CAM2 ScanArm contactless measuring system to achieve the real shape of top surfaces. Geomagic Control X software by 3D systems is used to evaluate the quality of measured surfaces in comparison with the expected geometry of the top plane of the benchmark. Findings The investigated approach involves adding an auxiliary finned-shape appendage, which acts similarly to the risers in foundry technology, to the top surface of the part that is being produced by MJF technology. The procedure and rules for determining the dimensions of the fin are established based on physical considerations and process modelling. The method is then applied to a prototype part, which is designed to highlight the effectiveness of the finned-riser design for improving the dimensional accuracy of the top surfaces of products manufactured by the MJF process. Experimental measurements of top surfaces of the original benchmark are compared to the same ones in the case of the finned-riser benchmark. Reported results are satisfactory, and the capillary effect occurred in the fins outside the border edges of the part. Further developments are planned to extend the proposed design. Originality/value MJF technology is attracting large interest from manufacturers to produce mass customised products. The quality of manufactured parts could be affected by peculiar defects related to process parameters. The present work aims to show a method to avoid the capillarity effect. It is based on an original analytical model developed by the authors and implemented successfully in the case of a benchmark geometry.

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