Optimization of the Operation Time Required for Data Gathering Requirement in Extended-Reach Drilling Well by the Use of Open Hole Tractor in the United Arab Emirates

2017 ◽  
Author(s):  
Takahiro Toki ◽  
Mhammed Benygzer ◽  
Khalid Ahmed Al Wahedi ◽  
Atul Kumar Anurag ◽  
Rudrap Pratap Narayan Singh ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Data Gathering ◽  
Operation Time ◽  
Open Hole ◽  
Time Required ◽  
Extended Reach Drilling

scholarly journals Different characteristics of infants diagnosed with congenital choledochal malformation prenatally or postnatally

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wei Chen ◽  
Jia Geng ◽  
Ya-lan Tan ◽  
Lian Zhao ◽  
Hui-hui Jia ◽  
...  
Keyword(s):  
Histopathological Examination ◽  
Fibrous Tissue ◽  
Operation Time ◽  
Normal Diet ◽  
Treatment Regimens ◽  
Total Length ◽  
Time Required ◽  
Different Characteristics ◽  
Length Of Hospitalization ◽  
Choledochal Malformation

AbstractThe general condition, clinical and pathological characteristics, and treatment regimens of patients prenatally and postnatally diagnosed with congenital choledochal malformation (CM) were analyzed in order to investigate the clinical significance of early diagnosis, treatment, and intervention in CM. We retrospectively analyzed 33 children who were admitted to the Children’s Hospital of Soochow University between 1 March 2010 and 31 May 2019, and their diagnosis of CM was confirmed by radiological, surgical and pathological findings. All the patients were under 36 months of age. The patients were divided into prenatally diagnosed and postnatally diagnosed groups. There were 16 and 17 CM patients in the prenatally and postnatally diagnosed groups, respectively, with a preponderance of females in both groups. Compared with the prenatally diagnosed group, the postnatally diagnosed group had a higher incidence of abdominal pain and vomiting (p < 0.05) and higher AST, GGT, and TB levels (p < 0.05). Although postoperative histopathological examination showed inflammation in both groups, congestion in the cyst walls and fibrous tissue hyperplasia were more significant in the postnatally diagnosed group (p < 0.05). In addition, operation time, length of time required to resume a normal diet after surgery, and total length of hospitalization differed between the 2 groups (p < 0.05), with the prenatally diagnosed group having a relatively longer operation time and taking longer to resume a normal diet after surgery. However, the total length of hospitalization in the prenatally diagnosed group was shorter than that in the postnatally diagnosed group. Compared with prenatally diagnosed CM patients, more symptoms, greater severity of symptoms, and more time to recovery after surgery were observed in postnatally diagnosed CM patients.

Rotordynamic Performance Measurements and Predictions of a Rotor Supported on Multilayer Gas Foil Journal Bearings for Microturbomachinery

2016 ◽  
Author(s):  
Jongsung Lee ◽  
Young Min Kim ◽  
Moon Sung Park ◽  
Tae Ho Kim ◽  
Kyoung Ku Ha ◽  
...  
Keyword(s):  
Damping Ratio ◽  
Operation Time ◽  
Journal Bearings ◽  
Displacement Sensor ◽  
Radial Clearance ◽  
Performance Measurements ◽  
Displacement Sensors ◽  
Model Predictions ◽  
Type C ◽  
Time Required

This paper presents rotordynamic performance measurements of multilayer gas foil journal bearings (GFJBs) supporting the rotor of oil-free microturbomachinery, and a comparison with the model predictions. A series of rotor coast-down tests from 60 krpm were conducted to compare the rotordynamic performances of three previously developed multilayer GFJBs: types A, B, and C. During the tests, two sets of orthogonally positioned displacement sensors recorded the horizontal and vertical rotor motions, and an axially positioned displacement sensor measured the thrust of the runner axial motion. The test results revealed that the type C GFJBs have a superior rotordynamic capability over the other types. The additional coast-down tests from 100 krpm for the type C showed that the synchronous motions of the rotor are dominant at up to ∼50 krpm, but that large amplitudes of subsynchronous motion associated with the natural frequency of a rotor-GFJB system occur above this speed. Thermal transient response measurements were conducted using four k-type thermocouples at increasing rotor speeds of 20 to 100 krpm with increments of 10 krpm. The operation time required to establish steady-state temperatures was approximately 25 min for each speed. For most of the speeds tested, the front GFJB near the rotor impeller end showed the lowest temperatures, and both the rear GFJB near the thrust runner end and the permanent magnet (PM) motor showed the highest temperatures. The GFTB showed the lowest temperature at low speeds of below 50 krpm, and the highest temperature at the top speed of 100 krpm owing to the increasing axial load caused by the impeller force. The measured impeller pressure and motor output power increased nonlinearly with the increasing rotor speed and fits best with the second-order and third-order polynomial equations, respectively. The measured axial displacement revealed that the rotor moved axially up to ∼ 270 μm toward the impeller side as the speed increased to 100 krpm. Further experiments using a decrease in radial clearance of 30 μm demonstrated a suppression of the large amplitude of the subsynchronous rotor motion to a certain degree. In addition, the onset speed of the subsynchronous motions increased to 80 krpm for the type C GFJBs with the decrease in the radial clearance. Rotordynamic model predictions with the predicted GFJB stiffness and damping coefficients were benchmarked against the test data. The predicted natural frequencies, onset speed of instability (OSI) where the damping ratio became negative, and synchronous rotor response versus speed agreed reasonably with the measured whirl frequencies of the subsynchronous motions, the onset speed of subsynchronous motions (OSS), and the filtered synchronous rotor motion versus speed, respectively. The predictions also showed that the OSI increased from 50 krpm to 80 krpm with a decrease in the radial clearance, thus validating the present rotordynamic model.

scholarly journals A Roadmap for Policy-Relevant Sea-Level Rise Research in the United Arab Emirates

2021 ◽  
Vol 8 ◽  
Author(s):  
Hannah Melville-Rea ◽  
Clare Eayrs ◽  
Nasser Anwahi ◽  
John A. Burt ◽  
Denise Holland ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
United Arab Emirates ◽  
Data Gathering ◽  
Climate Science ◽  
Climate Impacts ◽  
Coastal Development ◽  
Research Network ◽  
Deep Uncertainty ◽  
Climate Change Research

The United Arab Emirates (UAE) has a long-term policy horizon, the financial capital, and a vision for a sustainable knowledge-based economy. These characteristics uniquely situate it as a potential leader for sea-level rise research. Climate science is already growing, and at the center of the UAE's pivot toward climate research is a burgeoning concern for sea-level rise. Over 85% of the UAE's population and more than 90% of the nation's infrastructure is within a few meters of present-day sea-level. With its low-lying and shallow-sloping geography (about 35 cm per km), this high-value coastline, including the rapidly expanding cities of Dubai and Abu Dhabi, is particularly vulnerable to sea-level rise. Meanwhile, limited regional research and data scarcity create deep uncertainty for sea-level projections. We set out a potential roadmap for the UAE to capitalize on its strengths to create usable and relevant sea-level projections for the region. With a newly established Climate Change Research Network, the UAE government is beginning to draw together universities and research centers for “furthering effective data collection and management, and advancing policy-relevant research on climate impacts and adaptation1.” By consolidating ideas from the science community within the UAE, we identify promoters and barriers to data gathering, information sharing, science-policy communication, and funding access. Our paper proposes pathways forward for the UAE to integrate sea-level science with coastal development and form best practices that can be scaled across climate science and throughout the region.

scholarly journals Using Personal Digital Assistants and Electronic Forms to Collect and Rapidly Summarize Field Data

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 875D-875
Author(s):  
Arthur Villordon* ◽  
Jason Franklin ◽  
Don LaBonte
Keyword(s):  
Statistical Analysis ◽  
Data Collection ◽  
Field Data ◽  
Data Gathering ◽  
Analysis Data ◽  
Handheld Computers ◽  
Personal Digital Assistants ◽  
Desktop Computer ◽  
Microsoft Access ◽  
Time Required

The use of handheld computers such as personal digital assistants (PDAs) represents a feasible method of automating the transfer of files to computers for archiving and statistical analysis. Data collected using the PDA can be transferred directly to a database program on a desktop computer, virtually eliminating errors associated with the reentry of manually collected data. These devices are highly portable and can be housed in protective cases, enabling data collection even in inclement environments. The availability of handheld database programs that permit the development of electronic forms further makes the PDA a viable data collection platform for scientific research. These database applications not only allow novice users to develop customized forms that facilitate the recording of alphanumeric data; these applications also synchronize directly with current desktop-based database and spread-sheet applications. We used Microsoft Access database tables, along with Visual CE, a PocketPC database application, to generate electronic forms for collecting data from research trials conducted in 2003. To facilitate comparison with manual data collection, we also recorded observations using “pen and paper” methods. We found no differences between both methods in the length of time required to enter observations. However, the PDA transferred the data to a computer 600% faster relative to the manual reentry method. Using the handheld computer, field data was immediately available for compilation and statistical analysis within minutes of completing the data gathering process, at the same time ensuring the integrity and continuity of the files.

Helicopter Landing Ship: Undercarriage Strength and the Role of the Human Factor

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
E. Suhir
Keyword(s):  
Human Factor ◽  
Operation Time ◽  
Extreme Value Distribution ◽  
Mean Value ◽  
Helicopter Landing ◽  
The Times ◽  
The Moment ◽  
Normal Law ◽  
Time Required

We address, using probabilistic modeling and the extreme-value-distribution technique, the helicopter undercarriage strength in a helicopter-landing-ship situation. Our analysis contains an attempt to quantify, on the probabilistic basis, the role of the human factor in the situation in question. This factor is important from the standpoint of the operation time that affects the likelihood of safe landing during the lull period in the sea condition. The operation time includes (1) the time required for the officer-on-ship-board and the helicopter pilot to make their go-ahead decisions and (2) the time of actual landing. It is assumed, for the sake of simplicity, that both these times could be approximated by Rayleigh’s law, while the lull duration follows the normal law with a high enough ratio of the mean value to the standard deviation. Safe landing could be expected if the probability that it occurs during the lull time is sufficiently high. The probability that the helicopter undercarriage strength is not compromised can be evaluated as a product of the probability that landing indeed occurs during the lull time and the probability that the relative velocity of the helicopter undercarriage with respect to the ship’s deck at the moment of encounter does not exceed the allowable level. This level is supposed to be determined for the helicopter-landing-ground situation. The developed model can be used when developing specifications for the undercarriage strength, as well as guidelines for personnel training. Particularly, the model can be of help when establishing the times to be met by the two humans involved to make their go-ahead decisions for landing and to actually land the helicopter. Plenty of additional risk analyses (associated with the need to quantify various underlying uncertainties) and human psychology related efforts will be needed, of course, to make such guidelines practical.

Helicopter Landing Ship (HLS): Undercarriage Strength and the Role of the Human Factor

2009 ◽  
Author(s):  
Ephraim Suhir
Keyword(s):  
Human Factor ◽  
Probabilistic Approach ◽  
Operation Time ◽  
Extreme Value Distribution ◽  
Helicopter Landing ◽  
To Come ◽  
The Times ◽  
The Moment ◽  
Time Required

Based on the probabilistic approach and using the extreme value distribution (EVD) technique, we address the helicopter undercarriage strength in a helicopter-landing-ship (HLS) situation. Our analysis contains an attempt to quantify, also on the probabilistic basis, the role of the human factor in the situation in question. This factor is important from the standpoint of the operation time and, hence, from the standpoint of the likelihood of safe landing during the lull period in the sea condition. The operation time includes the time required for the officer-on-ship-board and the helicopter pilot to come up with their go-ahead decisions, and the time of actual landing. It is assumed, for the sake of simplicity, that both these times could be approximated by Rayleigh’s law, while the lull duration follows the normal law. Safe landing can be expected if the probability that it takes place during the lull time is sufficiently high. The probability that the helicopter undercarriage strength is not compromised can be evaluated as the product of the probability that landing occurs during the lull time and the probability that the relative velocity of the helicopter with respect the ship’s deck at the moment of the encounter of the undercarriage with the deck does not exceed the allowable level. The developed model can be used when establishing the requirements for the undercarriage strength, as well as when developing guidelines for personnel training. Particularly, it can be employed for establishing the times that need to be met by the two humans involved to make their decisions for landing and to actually land the helicopter in a timely fashion. It goes without saying that plenty of additional risk analyses (associated with the need to quantify various underlying uncertainties) and human psychology related effort will be needed to make such guidelines practical.

scholarly journals Artificial Intelligence-Assisted Visual Sensing Technology under Duodenoscopy of Gallbladder Stones

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Dongyan Li ◽  
Bin Du ◽  
Youhui Shen ◽  
Lin Ge
Keyword(s):  
Operation Time ◽  
Segmentation Algorithm ◽  
Conventional Group ◽  
Tube Placement ◽  
Good Effect ◽  
Gallbladder Stones ◽  
Visual Sensing ◽  
Sensing Technology ◽  
Postoperative Drainage ◽  
Time Required

Objective. This study is aimed at exploring the application effect of duodenoscopy assisted by visual sensing technology based on convolutional neural network (CNN) segmentation algorithm in the diagnosis and treatment of gallbladder stones, so as to provide safer and more effective treatment methods for patients with gallstones. Methods. 188 patients with gallstones and choledocholithiasis who were admitted to our hospital from January 2016 to April 2021 were selected as the research objects. Based on whether the patients were willing to use AI-assisted visual sensing technology during the treatment process, all patients were divided into two groups, namely, the AI group and the conventional group. Various surgical indicators of patients in two groups were compared. Results. The precision, recall, and mean intersection ratio of the M-Unet-based segmentation algorithm were 94.56%, 96.56%, and 98.92%, respectively. In the AI group, the operation time ( 2.74 ± 0.45   h ), postoperative drainage tube placement time ( 4.31 ± 1.15   d ), time required for recovery of gastrointestinal function ( 1.74 ± 0.54   d ), time required to get out of bed ( 1.14 ± 0.55   h ), and time spent in hospital ( 9.94 ± 1.45   d ) were all shorter compared with those in the conventional group, which were 3.21 ± 0.32   h , 12.14 ± 2.98   d , 2.89 ± 0.67   d , 2.09 ± 0.87   h , and 14.14 ± 1.15   h , showing statistical differences ( P < 0.05 ); the intraoperative blood loss ( 79.74 ± 6.45   mL ) and residual status of stones (0%) in the AI group were much lower than those in the conventional group ( P < 0.05 ). In addition, the incidence of complications (10.26%) and the indicators of postoperative gallbladder function of patients in the AI group were lower greatly than those in the conventional group ( P < 0.05 ). Conclusion. The visual sensing technology assisted by the CNN algorithm showed a good effect on image processing, and endoscopic technology can effectively improve the treatment effect of gallbladder stones combined with choledocholithiasis with the aid of this technology. Therefore, the conclusion in this study proved that visual sensing technology based on intelligent algorithms showed a good future in the medical field.

scholarly journals Distributed multi-robot sweep coverage for a region with unknown workload distribution

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Muqing Cao ◽  
Kun Cao ◽  
Xiuxian Li ◽  
Shenghai Yuan ◽  
Yang Lyu ◽  
...  
Keyword(s):  
Unit Area ◽  
Operation Time ◽  
Exact Distribution ◽  
Simulation Studies ◽  
Multiple Robots ◽  
Target Region ◽  
Workload Distribution ◽  
Time Required ◽  
Time Update ◽  
Theoretical Results

AbstractThis paper considers the scenario where multiple robots collaboratively cover a region in which the exact distribution of workload is unknown prior to the operation. The workload distribution is not uniform in the region, meaning that the time required to cover a unit area varies at different locations of the region. In our approach, we divide the target region into multiple horizontal stripes, and the robots sweep the current stripe while partitioning the next stripe concurrently. We propose a distributed workload partition algorithm and prove that the operation time on each stripe converges to the minimum under the discrete-time update law. We conduct comprehensive simulation studies and compare our method with the existing methods to verify the theoretical results and the advantage of the proposed method. Flight experiments on mini drones are also conducted to demonstrate the practicality of the proposed algorithm.

scholarly journals An intelligent recursive feature reduction methods for efficient classification of medical blogs

2018 ◽  
Vol 7 (1.7) ◽  
pp. 205
Author(s):  
Neeba E A ◽  
Koteeswaran S
Keyword(s):  
Data Gathering ◽  
Feature Reduction ◽  
Chemical Stimulus ◽  
Data Preparation ◽  
Healthcare Organizations ◽  
Health Related ◽  
Reduction Methods ◽  
Time Required

Nowadays people express themselvesin the form of weblogs attracting and benefiting users in their perspective. Blogs are maintained by individual users with specific software reporting activities that removing all possible barriers and developing learning blogs. Blogs together forms a linked community as blogosphere. Procuring information from these blogs has become very tough due to the intense growth of blogs. The proposed system classifies and compiles the blog ensuring appropriate chemo taxis analysis and reporting. These data preparation and analysis helps the healthcare organizations to solve many health related problems and identify new improvements. The movement of organism to chemical stimulus is recognized in chemo taxis. Chemo taxis is subverted in cancer phases. Weblogs not only manage and organize these data but also reduces the time required for data gathering, acquisition, analysis and reporting.

scholarly journals Review of manufacturers'recommendations on technological capabilities of ejectable excavator vibroplates assessment during soil compaction

2020 ◽  
Vol 17 (5) ◽  
pp. 562-573
Author(s):  
I. S. Tiuremnov ◽  
D. V. Fedorova
Keyword(s):  
Soil Compaction ◽  
Single Point ◽  
Operation Time ◽  
Technological Capabilities ◽  
Lack Of Information ◽  
Ace Model ◽  
Compaction Factor ◽  
Technical Specifications ◽  
Time Required ◽  
Selection Of

Introduction. Add-on compactors for excavators (ACE hereinafter) are replaceable working equipment for excavators. They are used for soil compaction after the backfill of trenches, wells, foundation cavities and other “narrow spaces” of construction, as well as soil compaction at slopes of embankments and excavations.In practical use of ACE, builders face two challenges:to justify the choice of an ACE for soil compaction under given conditions determined by the soil type and moisture, layer thickness, and the required compaction factor; to determine the time required to compact soil with an ACE at a single point positional compaction to ensure the required compaction factor of a given type of soil in a layer of required thickness.The problems above require the information regarding technological capabilities of ACEs in different technological situations of soil compaction. The assessment of such technological capabilities of ACEs, at the same time, should take into account the ongoing transition to a new regulatory framework in Russia in the field of assessment indicators for the results of soil compaction in construction.Materials and methods. ACE technological capabilities review was conducted based on the information provided on the official websites of the largest Russian and foreign ACE manufacturers and suppliers.Conclusion. The analysis of information provided by ACE manufacturers and suppliers showed that most of that information is technical specifications of ACEs and excavators. There is almost no information on technological capabilities of ACEs. At the same time, ACE manufacturers and suppliers use ambiguous terminology (for example, “compaction volume”) in the assessment of technological capabilities.Practical value. Lack of information on technological capabilities of ACEs in various technological situations of soil compaction leads to errors in selection of an ACE model and its operation time during single point positional soil compaction, which increases the risk of under compaction and reduced service life of constructed objects. To solve this problem, the Construction and Road-Building Machinery Department of Yaroslavl State Technical University is developing a methodology for calculating the results of soil compaction with an ACE in different technological situations.

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