scholarly journals Influence of Torrefaction Temperature and Climatic Chamber Operation Time on Hydrophobic Properties of Agri-Food Biomass Investigated Using the EMC Method

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5299
Author(s):  
Arkadiusz Dyjakon ◽  
Tomasz Noszczyk ◽  
Łukasz Sobol ◽  
Dominika Misiakiewicz
Keyword(s):  
Exposure Time ◽  
Operating Time ◽  
Operation Time ◽  
Waste Biomass ◽  
Climatic Chamber ◽  
Hydrophobic Properties ◽  
Moisture Adsorption ◽  
Lemon Peel ◽  
Mandarin Peel ◽  
Grapefruit Peel

Due to the tendency for excessive moisture adsorption by raw, unprocessed biomass, various methods of biomass valorization are in use, allowing for the improvement of physical–chemical biomass properties, including hydrophobicity. One of the methods is torrefaction, which changes the hydrophilic properties of the biomass to hydrophobic. Therefore, in this study, the influence of the torrefaction temperature and the exposure time to moisture adsorption conditions on the hydrophobic properties of waste biomass from the agri-food industry (lemon peel, mandarin peel, grapefruit peel, and butternut-squash peel) were analyzed. The torrefaction was carried out at the following temperatures: 200, 220, 240, 260, 280, 300, and 320 °C. The hydrophobic properties were determined by using the EMC (Equilibrium Moisture Content) method, conducting an experiment in the climatic chamber at atmospheric pressure, a temperature of 25 °C, and relative humidity of 80%. The total residence time of the material in the climate chamber was 24 h. It was shown that the torrefaction process significantly improves the hydrophobic properties of waste biomass. Concerning dried raw (unprocessed) material, the EMC (24 h) coefficient was 0.202 ± 0.004 for lemon peels, 0.223 ± 0.001 for grapefruit peels, 0.237 ± 0.004 for mandarin peels, and 0.232 ± 0.004 for butternut squash, respectively. After the torrefaction process, the EMC value decreased by 24.14–56.96% in relation to the dried raw material, depending on the type of organic waste. However, no correlation between the improvement of hydrophobic properties and increasing the torrefaction temperature was observed. The lowest values of the EMC coefficient were determined for the temperatures of 260 °C (for lemon peel, EMC = 0.108 ± 0.001; for mandarin peel, EMC = 0.102 ± 0.001), 240 °C (for butternut-squash peel, EMC = 0.176 ± 0.002), and 220 °C (for grapefruit peel, EMC = 0.114 ± 0.008). The experiment also showed a significant logarithmic trend in the dependence of the EMC coefficient on the operating time of the climatic chamber. It suggests that there is a limit of water adsorption by the material and that a further increase of the exposure time does not change this balance.

EFFECT OF OPERATING TIME OF THE WELLS IN THE STEADY DRAINAGE MODE BEFORE STOPPING ON THE RESULTS OF THE STUDY OF PRESSURE BUILD-UP CURVES

2017 ◽  
pp. 48-50
Author(s):  
E. F. Gilfanov
Keyword(s):  
Operating Time ◽  
Previous History ◽  
Operation Time ◽  
Pressure Recovery ◽  
Recovery Curve ◽  
History Of ◽  
Accuracy Of Results ◽  
Theoretical Pressure

Operation time of the well before stopping for investigating the pressure recovery curve in hydrodynamic studies is an important parameter affecting the quality and accuracy of results of research processing. Comparing the actual and theoretical pressure curves and the derivative, it’s possible to eliminate the uncertainty in the choice of previous history of the well operation.

L'uretere retrocavale: Embriogenesi e correzione laparoscopica con accesso retroperitoneale in un caso ad ansa bassa

1997 ◽  
Vol 64 (1_suppl) ◽  
pp. 18-22
Author(s):  
C. Trombetta ◽  
G. Savoca ◽  
G. Liguori ◽  
M. Raber ◽  
A. Lissiani ◽  
...  
Keyword(s):  
Operating Time ◽  
Oral Intake ◽  
Operation Time ◽  
Ureteral Stent ◽  
Surgical Wound ◽  
Extraperitoneal Approach ◽  
Intravenous Urogram ◽  
Minimal Morbidity ◽  
Urologic Surgery ◽  
Laparoscopic Techniques

With the minimal morbidity attained using laparoscopy, its application in urologic surgery has been increasing. Using laparoscopic techniques we successfully completed the transposition and re-anastomosis of a retrocaval right ureter. Operation time was 240 minutes. The patient was allowed to walk on the first post-operative day and resumed oral intake on the second day. Administration of analgesics was not required. The ureteral stent was removed on the 24th day after operation. An intravenous urogram three months after operation showed a decrease in hydronephrosis. Laparoscopic correction of retrocaval ureter by extraperitoneal approach is a safe, feasible technique, avoiding a large surgical wound with the definite advantage of minimal disfigurement. Operating time is considerably shorter compared to the peritoneal approach as described by Baba (240’ vs 560’).

scholarly journals Comparing Effectiveness Between a Power-Drill-Mounted Device and Conventional Free-Handed Technique for Distal Locking of Intramedullary Implants

2014 ◽  
Vol 2 (11_suppl3) ◽  
pp. 2325967114S0022
Author(s):  
Supachoke Wattanakitkrileart ◽  
Boonsin Tangtrakulwanich ◽  
Varah Yuenyongviwat
Keyword(s):  
Radiation Exposure ◽  
Exposure Time ◽  
Operative Time ◽  
Operating Time ◽  
Surgical Team ◽  
Intramedullary Nails ◽  
Distal Locking ◽  
Orthopedic Surgeons ◽  
Power Drill ◽  
Intramedullary Implants

Objectives: The procedure for distal locking of intramedullary nails (IM nail) is one of the time-consuming procedures and also exposes the surgical team and patient to high levels of radiation. Many techniques and devices have been created to solve the problems. Nonetheless, conventional free-hand technique is still the most popular due to easy-to-use and no added device needed. This research aims to study the accuracy of a drill-mounted device with free-handed technique in the distal locking of IM nail procedure. Methods: This is an experimental study. The device was made from PVC pipes. In this study, IM-nail-inserted synthetic femoral bones (Synbone®) were set as in IM nail procedure. Four orthopedic surgeons were instructed and performed the distal locking procedure with free-handed technique and then with the device (totally 20 times for each technique). The radiation exposure time and operating time were recorded. Results: The drill-mounted device reduced the radiation exposure time statistically significant lower than the free-handed technique. However, there was no different in operative time between the two techniques. Screw misdirection occurred two times in free-handed technique but not found in our device-assisted group. Conclusion: In this experiment, the new-designed device can reduce the radiation exposure time in distal IM nail interlocking procedure. Nonetheless, further clinical study is required to confirm our results.

scholarly journals A Multilayer Genetic Algorithm for Automated Guided Vehicles and Dual Automated Yard Cranes Coordinated Scheduling

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Qianru Zhao ◽  
Shouwen Ji ◽  
Wenpeng Zhao ◽  
Xinling De
Keyword(s):  
Genetic Algorithm ◽  
Energy Consumption ◽  
Operating Time ◽  
Operation Time ◽  
Complex Model ◽  
Automated Guided Vehicles ◽  
Total Energy Consumption ◽  
Equipment Operation ◽  
Storage Location ◽  
Calculation Results

At present, a lot of studies on automatic terminal scheduling are aimed at the shortest operating time. An effective way to reduce the operating time is to increase the amount of operating equipment. However, people often ignore the additional costs and energy consumption caused by increasing the amount of equipment. This paper comprehensively considers the two aspects of the equipment operation time and equipment quantity matching. With the minimum total energy consumption of the operating equipment as the objective function, a cooperative scheduling model of Automated Guided Vehicles (AGVs) and dual Automated Yard Cranes (AYCs) is established. In the modelling process, we also considered the interference problem between dual Automated Yard Cranes (AYCs). In order to solve this complex model, this paper designs an improved multilayer genetic algorithm. Finally, the calculation results from CPLEX and a multilayer genetic algorithm are compared, and the effectiveness of the model and algorithm is proved by experiments. In addition, at the same time, it is proved that it is necessary to consider the interference problem of dual Automated Yard Cranes (AYCs), and the optimal quantity matching scheme for the equipment and the optimal temporary storage location is given.

Rainwater propeller pumps structural integrity

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sergiu Valentin Galatanu ◽  
Sebastian Muntean ◽  
Liviu Marsavina ◽  
Iulian Ionut Ailinei ◽  
Dan Micota
Keyword(s):  
Shear Stress ◽  
Structural Integrity ◽  
Maximum Shear Stress ◽  
Operating Time ◽  
Operation Time ◽  
Technical Solution ◽  
Catastrophic Events ◽  
Impeller Blade ◽  
Content Type ◽  
Technical Solutions

Purpose The purpose of this paper is to focus on the structural integrity of the rainwater propeller pumps installed in the municipal wastewater treatment plant (WTP). Design/methodology/approach A numerical analysis is performed to determine the maximum shear stress on the fasten bolts. The rainwater propeller pump is examined in operation at normal conditions and when one blade is progressively blocked. Findings The failure mechanism of the rainwater pump impeller is determined. Research limitations/implications The fibbers and wastes are discharged together with rainwater during storms with these types of pumps to avoid the flood of the WTP. Several catastrophic events have occurred in service due to the fibbers clog the gap between the impeller blades and the pump casing. The clogging process is partially understood so actual technical solutions deal with effects rather the main causes. Practical implications The operation time of all seven rainwater pumps installed in Timisoara’s WTP is investigated. Climate changes in Banat region and new waste properties found in the wastewater require appropriate technical solutions. A technical solution is proposed based on these investigations to extend the operation time and to diminish the operation and maintenance costs. Social implications These large pumps are installed in the urban sewage centralised system implemented in the most cities. The access to the sewerage network is a requirement of any community, regardless of the social status. Originality/value The fracture surfaces of both fastening bolts of the rainwater pump impellers produced in service are examined. As a result, it has been identified that the catastrophic events are due to the brittle fracture of both fasten bolts between the impeller blades and the pump hub, respectively. The catastrophic events of the rainwater propeller pumps are directly correlated to the clog level of the impeller. The numerical simulation is performed to determine the maximum shear stress on the fasten bolts. The case with pump operating at normal conditions is performed identifying its vulnerabilities to clog conditions. Next, one impeller blade is progressively blocked considering three time stop scenarios associated with different clog levels. Conclusively, the operating time of the rainwater pump up to the catastrophic failure is correlated to the clog level of the impeller.

scholarly journals Endoscopic, Single-Session Management of Encrusted, Forgotten Ureteral Stents

Medicina ◽  
2019 ◽  
Vol 55 (3) ◽  
pp. 58 ◽  
Author(s):  
Volkan Ulker ◽  
Orcun Celik
Keyword(s):  
Hospital Stay ◽  
Treatment Options ◽  
Operating Time ◽  
Operation Time ◽  
Ureteral Stents ◽  
Single Session ◽  
Extracorporeal Shock Wave ◽  
Clavien Grade ◽  
Grade Ii ◽  
The Mean

Background and Objectives: Remained or forgotten ureteral double-J stents may cause serious complications. Removing of an encrusted, forgotten stent can be challenging. We present our experience with heavily encrusted ureteral stents and discuss the endourologic treatment options as well as their effectivity. Materials and Methods: Eleven men and six women (mean 48.58 ± 14.48 years of age) with 18 encrusted forgotten stents (mean 16.4 ± 13.25 months of indwelling) were treated at our clinic. All patients underwent the operation after negative urine cultures were obtained. Their medical records were retrospectively reviewed and analyzed in terms of number of interventions required to remove the stent, operation time, complications, hospital stay and stone-free rate. Results: According to the Forgotten-Encrusted-Calcified (FECal) classification, the most common form of stent encrustation was grade III (64.7%) and 17.6% of the stents were fragmented. Four of 17 patients were initially treated with extracorporeal shock-wave lithotripsy. The patients required a mean of two endoscopic interventions for removing the encrusted stent and all stents were removed endoscopically in a single session. The mean operating time was 63.3 ± 41.8 minutes. Cystolithotripsy followed by ureteroscopy was the most common intervention (41.1%). Of the 17 patients, peroperative and postoperative complications were Clavien grade I in two, grade II in two and grade IIIb in one. The mean hospital stay was 1.3 ± 0.99 days. All patients were stone-free after a month of stent removal. Conclusions: The endourological removal of the encrusted forgotten stents in a single session is feasible and effective with a minimal morbidity. The treatment strategy should be to minimize the number of interventions.

scholarly journals Sutureless hemorrhoidectomy vs open hemorrhoidectomy: a prospective study in a regional hospital of Western Nepal

2015 ◽  
Vol 3 (2) ◽  
pp. 121-123
Author(s):  
P Ghimire ◽  
NV Gurung ◽  
PK Upadhaya ◽  
S Shrestha ◽  
A Gurung ◽  
...  
Keyword(s):  
Hospital Stay ◽  
Demographic Data ◽  
Operating Time ◽  
Operation Time ◽  
Regional Hospital ◽  
Time Duration ◽  
Duration Of Symptoms ◽  
Sutureless Technique ◽  
Open Hemorrhoidectomy ◽  
Early Return

Background: The aim of this study is to compare sutureless Hemorroidectomy with Conventional Open Hemorrhoidectomy in terms of safety and clinical efficacy.Method: A prospective analytical study of 60 operated patients (a nonrandomized cohort) was carried out by following up from admission to 1 month period after hospital discharge in between July, 2013 to February, 2014 in Western Regional Hospital, Pokhara, Nepal. Demographic data, clinical data, mean operation time, duration of hospital stay, number of parenteral analgesic injections and post-operative complications between the two groups were recorded and analyzed.Result: There were no statistically significant differences between the two groups in terms of age, gender, duration of symptoms, grade of the hemorrhoid(s), or number of hemorrhoids resected. The mean operating time for LigaSure sutureless hemorrhoidectomy was significantly shorter than that for the Open hemorrhoidectomy (P < 0.001). Patients treated with the LigaSure technique had less blood loss, a better pain score (P < 0.001), less parenteral analgesic requirement (P < 0.001), shorter hospital stay (P < 0.001), and early return to work (P < 0.01). Conclusion: Sutureless Technique is safe and effective as compared to Conventional Open Hemorrhoidectomy for grade III and IV hemorrhoids.Nepal Journal of Medical Sciences Vol.3(2) 2014: 121-123

PS01.228: THORAX AFFECTS OPERATION TIME IN VATS ESOPHAGECTOMY FOR PATIENTS WITH ESOPHAGEAL CANCER

2018 ◽  
Vol 31 (Supplement_1) ◽  
pp. 114-115
Author(s):  
Shinsuke Takeno ◽  
Fumiaki Kawano ◽  
Kousei Tashiro ◽  
Rouko Hamada ◽  
Takashi Wada ◽  
...  
Keyword(s):  
Conflicts Of Interest ◽  
Team Building ◽  
Operating Time ◽  
Operation Time ◽  
Esophageal Surgery ◽  
Preoperative Treatment ◽  
Rib Cage ◽  
Factors Affecting ◽  
Preoperative Ct ◽  
Surgical Difficulty

Abstract Background Thoracoscopic esophagectomy (TE) was reported that increased morbidity in the National Clinical Data analysis in Japan and technical proficiency is required as the esophageal surgery team. The aim of this study is to assess the degree of surgical difficulty from operation time and to applicate for esophageal surgery team-building and the education of next-generation. Methods Consecutive initial 33 cases by the same operator was statistically examined concerning the correlation between chest operation time and the empirical effect of the time shortening, BMI, obstructive pulmonary disorders, Rib cage area, tumor progression, preoperative treatment as an indicator of the degree of surgical difficulty. Rib cage area measured in the preoperative CT Imaging. Results As the factors affecting the extension of operating time, the narrower upper rib cage area correlated with the prolonged operation time in the univariate (P = 0.0279) and multivariate (P = 0.0125) analysis. Empirical time reduction (P = 0.0429) also was correlated with chest operation time. In addition, there was a significant correlation between chest operation time and blood loss (P = 0.0007). Conclusion In the training of TE, operating surgeon or first assistant should start from the patient with broad upper rib cage area in chest CT. Disclosure All authors have declared no conflicts of interest.

scholarly journals Skin Staples: A Safe Technique for Securing Mesh in Lichtensteins Hernioplasty as Compared to Suture

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Anand Munghate ◽  
Sushil Mittal ◽  
Harnam Singh ◽  
Gurpreet Singh ◽  
Manish Yadav
Keyword(s):  
Mesh Fixation ◽  
Operating Time ◽  
Operation Time ◽  
Skin Closure ◽  
Skin Staples ◽  
Group I ◽  
Lichtenstein Hernia Repair ◽  
Duration Of Surgery ◽  
Group Ii ◽  
Polypropylene Sutures

Background.Lichtenstein tension free repair is the most commonly used technique due to cost effectiveness, low recurrence rate, and better patient satisfaction. This study was done to compare the duration of surgery and postoperative outcome of securing mesh with skin staples versus polypropylene sutures in Lichtenstein hernia repair.Materials and Methods.A total of 96 patients with inguinal hernia undergoing Lichtenstein mesh repair were randomly assigned into two groups. The mesh was secured either by using skin staples (group I) or polypropylene sutures (group II).Results.The operation time was significantly reduced from mesh insertion to completion of skin closure in group I (mean 20.7 min) as compared to group II (mean 32.7 min) with significantPvalue(P<0.0001)and less complication rate in group I as compared to group II.Conclusion.Mesh fixation with skin staples is as effective as conventional sutures with added advantage of significant reduction in the operating time and complications or recurrence. The staples can be applied much more quickly than sutures for fixing the mesh, thus saving the operating time. Infection rate is significantly decreased with staples.

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