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Łokietek, Tomasz, Wojciech Tuchowski, Dorota Leciej-Pirczewska, and Anna Głowacka. "Heat Recovery from a Wastewater Treatment Process—Case Study." Energies 16, no. 1 (December 21, 2022): 44. http://dx.doi.org/10.3390/en16010044.
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This article presents the potential of heat recovery from wastewater with an example of a wastewater treatment plant (WWTP) in Mokrawica, which is located in the West Pomeranian region of Poland. A thorough literature review discusses the relevance of the topic and shows examples of heat recovery conducted with heat pumps. Raw and treated wastewater are mostly used as heat sources, with the latter achieving higher thermal capacities. Heat recovery from a biological treatment process is rarely implemented and requires more detailed studies on this subject. The proposed methodology for estimating possible heat recovered from wastewater, requiring heating and cooling capacities, as well as the coefficient of performance (COP) of a heat pump, is based on only three parameters: wastewater volumetric flow, wastewater temperature, and the required temperature for heating or air-conditioning. The heat recovery potential was determined for different parts of WWTP processes, i.e., the sand box, aeration chamber, secondary sedimentation tank, and treated sewage disposal. The average values of 309–451 kW and a minimum of 58–68 kW in winter were determined. The results also indicate that, depending on the location of the heat recovery, it is possible to obtain from wastewater between 57.9 kW and 93.8 kW of heat or transfer to wastewater from 185.9 to 228.2 kW. To improve biological treatment processes in the winter season, wastewater should be preheated with a minimum of 349–356 kW that can be recovered from the treated wastewater. The heat transferred to the wastewater from the air-conditioning system amounts to 138–141 kW. By comparing the required cooling and heating capacities with the available resources, it is possible to fully recover or transfer the heat for central heating, hot water, and air conditioning of the building. Partial preheating of wastewater during the treatment process requires further analysis.
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Liu, Hui, Shi Hua Bi, Xin Jie Yu, Jun Li, Zhen Li, and Pei Zhu Liu. "Study on the Recovery Circuit Based on Multi-Module STRETCH Meat Grinder." Applied Mechanics and Materials 496-500 (January 2014): 1073–78. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1073.
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Inductive pulse power supplies attract interests since their energy densities are one order of magnitude higher than those of capacitive ones at the same power output capacity. STRETCH meat grinder was put forward by IAT (Institute of Advanced Technology). Energy Recovery circuit was developed to improve the energy efficiency and reduce the energy loss of the whole circuit. The residual energy can be recovered by triggering the related thyristors. Simulation results show that the topology with energy recovery circuit can recover most of the residual energy by triggering thyristors and has potential applications for high energy systems in the future.
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Ku, Elaine, Raymond K. Hsu, Kirsten L. Johansen, Charles E. McCulloch, Mark Mitsnefes, Barbara A. Grimes, and Kathleen D. Liu. "Recovery of kidney function after dialysis initiation in children and adults in the US: A retrospective study of United States Renal Data System data." PLOS Medicine 18, no. 2 (February 19, 2021): e1003546. http://dx.doi.org/10.1371/journal.pmed.1003546.
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Background Little is known about factors associated with recovery of kidney function—and return to dialysis independence—or temporal trends in recovery after starting outpatient dialysis in the United States. Understanding the characteristics of individuals who may have the potential to recover kidney function may promote better recognition of such events. The goal of this study was to determine factors associated with recovery of kidney function in children compared with adults starting dialysis in the US. Methods and findings We determined factors associated with recovery of kidney function—defined as survival and discontinuation of dialysis for ≥90-day period—in children versus adults who started maintenance dialysis between 1996 and 2015 according to the United States Renal Data System (USRDS) followed through 2016 in a retrospective cohort study. We also examined temporal trends in recovery rates over the last 2 decades in this cohort. Among 1,968,253 individuals included for study, the mean age was 62.6 ± 15.8 years, and 44% were female. Overall, 4% of adults (83,302/1,953,881) and 4% of children (547/14,372) starting dialysis in the outpatient setting recovered kidney function within 1 year. Among those who recovered, the median time to recovery was 73 days (interquartile range [IQR] 43–131) in adults and 100 days (IQR 56–189) in children. Accounting for the competing risk of death, children were less likely to recover kidney function compared with adults (sub-hazard ratio [sub-HR] 0.81; 95% CI 0.74–0.89, p-value <0.001; point estimates <1 indicating increased risk for a negative outcome). Non-Hispanic black (NHB) adults were less likely to recover compared with non-Hispanic white (NHW) adults, but these racial differences were not observed in children. Of note, a steady increase in the incidence of recovery of kidney function was noted initially in adults and children between 1996 and 2010, but this trend declined thereafter. The diagnoses associated with the highest recovery rates of recovery were acute tubular necrosis (ATN) and acute interstitial nephritis (AIN) in both adults and children, where 25%–40% of patients recovered kidney function depending on the calendar year of dialysis initiation. Limitations to our study include the potential for residual confounding to be present given the observational nature of our data. Conclusions In this study, we observed that discontinuation of outpatient dialysis due to recovery occurred in 4% of patients with end-stage kidney disease (ESKD) and was more common among those with ATN or AIN as the cause of their kidney disease. While recovery rates rose initially, they declined starting in 2010. Additional studies are needed to understand how to best recognize and promote recovery in patients whose potential to discontinue dialysis is high in the outpatient setting.
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Dessie, Anteneh Mengist, Sefineh Fenta Feleke, Denekew Tenaw Anley, Rahel Mulatie Anteneh, and Zelalem Animut Demissie. "Assessment of Factors Affecting Time to Recovery from COVID-19: A Retrospective Study in Ethiopia." Advances in Public Health 2022 (April 12, 2022): 1–7. http://dx.doi.org/10.1155/2022/7182517.
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Background. The average duration of recovery from COVID-19 and influencing factors, which would help inform optimal control strategies, remain unclear. Moreover, studies regarding this issue are limited in Ethiopia, and no region-wise studies were conducted. Hence, this study aimed to investigate the median recovery time from COVID-19, and its predictors among patients admitted to Amhara regional state COVID-19 treatment centers, Ethiopia. Methods. A facility-based retrospective follow-up study was conducted at Amhara regional state COVID-19 treatment centers from 13 March 2020 through 30 March 2021. Data were entered using EpiData version 3.1, and STATA version 14 was used for analysis. A Kaplan–Meier curve was used to estimate survival time, and the Cox regression model was fitted to identify independent predictors. P value with 95% CI for the hazard ratio was used for testing the significance at alpha 0.05. Results. Six hundred twenty-two cases followed, and 540 observations developed an event at the end of the follow-up. The median time to recovery was 11 days with an interquartile range of 9–14 days. Most of the patients were recovered from COVID-19 between days seven and fourteen. In the first six days of admission, only 4.2% of cases had recovered, but by day 14, 73.8% had recovered. Patients without comorbid illness/s were faster to recover than their counterparts (AHR = 1.44 : 95% CI: 1.10, 1.91) and those who have signs and symptoms on admission (AHR = 0.42 : 95% CI: 0.30, 0.60) and old-aged (AHR = 0.988; 95% CI: 0.982, 0.994) took longer to recover. Conclusion. In conclusion, a relatively short median recovery time was found in this study. Significant predictors for delayed recovery from COVID-19 were older age, presence of symptoms at admission, and having at least one comorbid condition. These factors should be placed under consideration while developing a strategy for quarantining and treating COVID-19 patients.
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Bron, Dominique, Van Hyunh, Virginie Dewilde, Jalil Bennani, Philippe Lewalle, Phuong Huynh, Rita Leroy, et al. "Immunological Recovery after Nonmyeloablative Transplant: A Prospective Study of 24 Patients Treated in a Single Center." Blood 104, no. 11 (November 16, 2004): 5044. http://dx.doi.org/10.1182/blood.v104.11.5044.5044.
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Abstract Background: Nonmyeloablative conditioning regimens are more and more widely used in the setting of stem cell transplant due to a reduced transplant related mortality. However, these conditioning regimens include more immunosuppressive agents and little data in terms of immunological recovery are found in the literature. Population: 24 patients (pts) admitted for nonmyeloablative transplant from HLA identical donors were prospectively followed during a period of 1 year. All pts received a conditioning regimen consisting of rabbit ATG (fresenius), Fludarabine phosphate, Cyclophosphamide ( ARA-C for myeloid malignancies) cyclosporin A and mycophenolate mofetil (MMF). Lymphocytes markers expression as well as lymphocytes absolute numbers were studied to evaluate the cellular immunologic recovery. IgG, IgA and IgM levels were also monitored during one year. Pts were stratified according to the presence of GVHD(acute and chronic) or not. Results: 24 pts with a median age of 52 (20–64) years old transplanted with an attenuated conditioning regimen, were evaluated. Median delay to recover 500 ANC and 20000 plt/ul was 8 days. Without GVHD, the pts recover a normal level of CD3, CD8, CD19,CD56 and CD45RO positive lymphocytes within 6 months. CD4+ and CD45RA + lymphocytes did not reach normal values within 1 year; Therefore the CD4/CD8 ratio remains low for more than 12 months. This observation explains the high incidence of oppotunistic infections in these pts even 6 months after transplantion. In our small seies,with or without GVHD neither IgA, nor IgM recovered within 1 year. IgG recovery is not evaluable because of human IVIG administration monthly after transplant. Conclusion: our small series confirms the rapid hematologic recovery after nonmyeloablative transplant.Cellular immunological recovery without GVHD is achieved within 6 months for most of the lymphocytes subsets excepted the CD4+ lymphocytes who need more than 12 months to recover. IgM and IgA recovery is also very slow.
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Reinders, I. M. A., M. R. D. van de Kar, P. M. A. J. Geomini, J. C. Leemans, J. W. M. Maas, and M. Y. Bongers. "Short-term recovery after NovaSure® endometrial ablation: a prospective cohort study." Facts, Views and Vision in ObGyn 14, no. 4 (December 30, 2022): 299–307. http://dx.doi.org/10.52054/fvvo.14.4.042.
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Background: Endometrial ablation is a frequently performed treatment for heavy menstrual bleeding, but detailed information about recovery to help inform patients is lacking. Objective: To gain more insight into the short-term recovery after NovaSure® endometrial ablation, with the goal of improving preprocedural counselling. Materials and Methods: A total of 61 women who underwent endometrial ablation between March 2019 and November 2021 in a teaching hospital in the Netherlands were included in this prospective cohort study. Main outcome measures: Short-term recovery was investigated through questionnaires in the first week after the procedure. The primary outcome was the Recovery Index (RI-10). Secondary outcomes included health-related quality of life (EQ-5D-5L), pain intensity, use of analgesics, nausea, vaginal discharge, capability of performing activities (domestic chores, sports, work), self-rated health (EQ-VAS) and the feeling of full recovery. Results: A total of 33 women underwent the procedure under local anaesthesia and 28 women under procedural sedation. The RI-10 increased in the first week; median scores on day one, two and seven were 34 (IQR 28.5-41.5), 38.5 (IQR 31-47), and 42 (IQR 37.5-48), respectively. The median time for full recovery was five days. However, 23% of all women were not fully recovered within seven days. Women needed a median time of two days for returning to their work and 5.5 days for sporting activities. There were no differences in recovery between both anaesthesia techniques. Conclusions: Women undergoing endometrial ablation can be informed that most will fully recover within the first week of the procedure and that there is no difference in expected recovery time according to whether the procedure is undertaken with local anaesthesia or conscious sedation. What is new? The short-term recovery after endometrial ablation has been mapped in this trial. This information can be used in counselling women with heavy menstrual bleeding.
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Min, Jihee, Jee Ye Kim, Sujin Yeon, Jiin Ryu, Jin Joo Min, Seho Park, Seung Il Kim, and Justin Y. Jeon. "Change in Shoulder Function in the Early Recovery Phase after Breast Cancer Surgery: A Prospective Observational Study." Journal of Clinical Medicine 10, no. 15 (July 31, 2021): 3416. http://dx.doi.org/10.3390/jcm10153416.
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Breast cancer surgery significantly affects the shoulder’s range of motion (ROM) and strength. However, the extent of shoulder impairment, as well as patterns of recovery immediately after surgery, is not fully understood. Therefore, we aimed to investigate shoulder ROM and strength during the early recovery phase after surgery. Thirty-two breast cancer patients were observed five times: the day before surgery, discharge day (postoperative day 1 (POD1) or (POD2)), first outpatient visit (POD7–10), second outpatient visit (POD14–20), and third outpatient visit (POD21–30). We assessed shoulder passive ROM and strength for both affected and unaffected arms at each observation. ROM decreased in both affected and unaffected sides post-surgery. ROM on the affected side did not recover to the pre-surgery level until the third outpatient visit (POD24). In contrast, the ROM on the unaffected side recovered to the pre-surgery level by the first outpatient visit (POD10). The shoulder strength of both arms declined and did not recover to pre-surgery levels. Shoulder strength in the affected arm significantly decreased immediately after surgery (52.9% of the pre-surgery levels) and did not recover until the third outpatient visit (62.5% of the pre-surgery levels), whereas that in the unaffected arm decreased gradually (83.1 ± 2.3 at POD 1 and 78.9 ± 2.9 at POD 24). Descriptively, patterns of recovery in ROM may vary according to types of surgery while patterns of recovery in shoulder strength did not: shoulder strength significantly decreased and did not recover notably regardless of types of surgery. Both shoulder ROM and strength reduced during the early recovery phase after breast cancer surgery regardless of types of surgery, although the degree of reduction was greater in shoulder strength than ROM. Our findings suggest that rehabilitation exercises should be implemented in both upper limbs.
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Lee, Koo, Sung Bae Cho, Junsin Yi, and Hyo Sik Chang. "Simplified Recovery Process for Resistive Solder Bond (RSB) Hotspots Caused by Poor Soldering of Crystalline Silicon Photovoltaic Modules Using Resin." Energies 15, no. 13 (June 24, 2022): 4623. http://dx.doi.org/10.3390/en15134623.
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When the thickness of the solar cell wafer and the amount of Ag to be used decreases, it is the best method to recover the power of the module after use at a minimum cost and reuse the module itself. Economic recovery technology can be applied to the power degradation, caused by the resistive solder bond (RSB) hotspot by poor soldering, because the recovery process can be simplified compared to the power loss that is often greater than 30%. This study demonstrated a quick recovery of the RSB hotspot with on-site recovery technology applied with resin and verified the performance and long-term reliability of on-site recovery technology, compared to the factory recovery method, where the back sheet is removed and laminated to recover the module. Both the factory and field recovery methods confirmed recovery results closer to the initial rated power output of the samples. Each sample was degraded by the RSB hotspot to ~62–65% of the initial power output, and the recovery process successfully recovered it to ~96–99%. In on-site recovery, verification of the possible EVA solvothermal swelling, which is the effect of organic solvents contained in the resin on EVA, is essential for verifying the long-term reliability of the recovered module. In this study, the power degradations of the on-site recovered samples after a TC 200 cycle test are −2.14% and −0.95%, respectively, which are within the certification test standard of the new manufacturing module. Existing factory recovery costs not only in the recovery process, but also in a total of 22 stages, such as the transfer of the target module. The largest advantage is that the on-site recovery process can be restarted in the field after only eight stages.
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Menon, J. K. R., R. M. Nair, and S. Priyanka. "Unilateral vocal fold paralysis: can laryngoscopy predict recovery? A prospective study." Journal of Laryngology & Otology 128, no. 12 (November 17, 2014): 1095–104. http://dx.doi.org/10.1017/s0022215114002667.
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AbstractObjective:To determine the prognostic value of laryngoscopy in predicting the recovery of unilateral vocal fold paralysis.Method:A prospective study was carried out of all patients with unilateral vocal fold paralysis without a progressive lesion or arytenoid dislocation.Results:Among the 66 candidates, 15 recovered. Patients with interarytenoid paralysis (p < 0.001) or posterolateral tilt of the arytenoid (p = 0.028) had less chance of recovery. Among 51 patients who did not recover, 25.49 per cent regained phonatory function by compensatory movement of the normal side; the rest required an intervention. Intervention requirement was significantly less for those patients who had isolated glottic level compensation. The paralysed vocal fold was at the same level in 32.35 per cent of patients, higher in 38.23 per cent and lower in 29.42 per cent. In those in whom vocal folds were in the abducted position (46.67 per cent), the affected vocal fold was at a lower position on phonation. Inter-observer reliability assessment revealed excellent to good agreement for all criteria.Conclusion:Interarytenoid paralysis and posterolateral tilt of the arytenoid were predictors of poor recovery.
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Sandoval Martinez, Maria Isabel, and Samuel Fernando Muñoz Navarro. "Laboratory study of cyclic liquid solvent injection process for heavy oil recovery through computed tomography." DYNA 86, no. 210 (July 1, 2019): 81–90. http://dx.doi.org/10.15446/dyna.v86n210.74983.
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The cyclic solvents injection has been considered for years as an improved non-thermal enhanced oil recovery method for the recovery of heavy oil, which includes three stages: injection, soaking, and production. This paper describes a laboratory study with Computed Tomography and Nuclear Magnetic Resonance of a cyclic solvent injection process in a porous medium, using naphtha as a liquid diluent to recover a Colombian heavy oil in a porous medium at 84 °C. The core was scanned during the soaking time to determine the expansion behavior of the mixing zone by analyzing the density profiles obtained after each scan. It was also scanned after the production stage to observe the distribution of saturation in the porous medium after each cycle. Finally, the fluids recovered from porous medium were taken to a nuclear magnetic resonance equipment to determine the recovery factor.
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Hall, DavidJ. "A recovery case study." Computer Fraud & Security Bulletin 1990, no. 2 (February 1990): 10–13. http://dx.doi.org/10.1016/0142-0496(90)90167-j.
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Hall, David J. "Disaster recovery case study." Computer Audit Update 1991, no. 3 (March 1991): 16–19. http://dx.doi.org/10.1016/0960-2593(91)90037-a.
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Jiang, Yiwei, Chon C. Lim, and Rajeev Arora. "A Study on the Recovery Following Freeze–Thaw Injury in Onion and Chrysanthemum." HortScience 33, no. 3 (June 1998): 454b—454. http://dx.doi.org/10.21273/hortsci.33.3.454b.
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Onion (Allium cepa L. cv Sweet Sandwich) and Chrysanthemum (Dendranthema grandiflora `Sunny Denise') tissues were used to investigate protein changes associated with recovery from freeze–thaw injury. Medium-sized onions were slowly frozen to either –4 or –9 °C, subsequently thawed, and divided in two halves. One half was used immediately for ion leakage (IL) measurements and total and microsomal protein extraction, whereas the other half was allowed to recover at 6 to 8 °C in the dark for 4 to 5 days. Chrysanthemum leaves were frozen to –3.75 °C, and allowed to recover first at 6 to 8 °C in the dark (1 d) and then under 12-h photoperiod at 18 °C (3–4 d). Results indicate a 1.4- and 2.5-fold higher IL, compared to control, from onion tissues frozen to –4 or –9 °C, respectively. IL in –4 °C-treated tissues was the same as respective control following recovery; however, it was further enhanced to 3.6-fold in –9 °C-treated samples. Chrysanthemum leaf tissue exhibited a 1.6-fold increase in ion leakage following injury, but completely recovered to control levels after 4 to 5 d. SDS-PAGE profiles revealed an absence of a 25-kDa microsomal protein in the injured onion tissues but, its up regulation during recovery only in reversibly injured tissues. Data also indicated an accumulation of 36-kDa soluble protein in chrysanthemum leaf tissues during recovery. Experiments are underway to further characterize these protein changes.
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Zunnera Rashid Chaudhry, Erum Rashid, Sana Rasheed, Hina Aslam, Sabeen Shakir, and Faiza Rasheed. "Correlation of hemoglobin with recovery time in COVID 19 infected patients." Professional Medical Journal 28, no. 12 (November 30, 2021): 1692–95. http://dx.doi.org/10.29309/tpmj/2021.28.12.6694.
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Objectives: To study the correlation between recovery time and hemoglobin level in COVID-19 infected patients. Study Design: Observational study. Setting: Rawal Institute of Health Sciences Islamabad, Pakistan Institute of Medical Sciences Islamabad. Period: February 2021 to June 2021. Material & Methods: Data was analyzed using SPSS version 27.Mann Whitney U test was used to compare the duration of recovery among the groups and spearman's correlation was applied for correlating the duration of recovery with the Hb levels of COVID-19 patients. Result: Group 1 patients recovered within 14 days and group 2 patients recovered after 14 days. COVID-19 infected Patients with low hemoglobin level took more than 14-20 days to recover from disease and those with high hemoglobin recovered within 8-14 days. Conclusion. Recovery from disease was prolonged in corona virus infected patients with less hemoglobin as compared to patients with high levels of hemoglobin levels.
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Rossow, Lindy M., David H. Fukuda, Christopher A. Fahs, Jeremy P. Loenneke, and Jeffrey R. Stout. "Natural Bodybuilding Competition Preparation and Recovery: A 12-Month Case Study." International Journal of Sports Physiology and Performance 8, no. 5 (September 2013): 582–92. http://dx.doi.org/10.1123/ijspp.8.5.582.
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Bodybuilding is a sport in which competitors are judged on muscular appearance. This case study tracked a drug-free male bodybuilder (age 26–27 y) for the 6 mo before and after a competition.Purpose:The aim of this study was to provide the most comprehensive physiological profile of bodybuilding competition preparation and recovery ever compiled.Methods:Cardiovascular parameters, body composition, strength, aerobic capacity, critical power, mood state, resting energy expenditure, and hormonal and other blood parameters were evaluated.Results:Heart rate decreased from 53 to 27 beats/min during preparation and increased to 46 beats/min within 1 mo after competition. Brachial blood pressure dropped from 132/69 to 104/56 mmHg during preparation and returned to 116/64 mmHg at 6 mo after competition. Percent body fat declined from 14.8% to 4.5% during preparation and returned to 14.6% during recovery. Strength decreased during preparation and did not fully recover during 6 months of recovery. Testosterone declined from 9.22 to 2.27 ng/mL during preparation and returned back to the baseline level, 9.91 ng/mL, after competition. Total mood disturbance increased from 6 to 43 units during preparation and recovered to 4 units 6 mo after competition.Conclusions:This case study provides a thorough documentation of the physiological changes that occurred during natural bodybuilding competition and recovery.
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Corbella, S., and D. D. Stretch. "Shoreline recovery from storms on the east coast of Southern Africa." Natural Hazards and Earth System Sciences 12, no. 1 (January 2, 2012): 11–22. http://dx.doi.org/10.5194/nhess-12-11-2012.
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Abstract. Episodic extreme waves due to sea storms can cause severe coastal erosion. The recovery times of such events are important for the analysis of risk and coastal vulnerability. The recovery period of a storm damaged coastline represents a time when the coastline is most vulnerable and nearby infrastructure is at the greatest risk. We propose that identification of the beach recovery period can be used as a coastal management tool when determining beach usage. As a case study, we analyse 37 yr of beach profile data on the east coast of South Africa. Considering beach length and cross-sectional area, we establish a global recovery period and rate and identify the physical characteristics of the coastlines that either accelerate or retard recovery. The beaches in the case study were found to take an average of two years to recover at a rate of approximately 90 m3 m−1 yr−1. Beach profiles with vegetated dunes recovered faster than urbanized beaches. Perpendicular beach structures have both positive and negative effects on beach recovery. Coastlines with rock outcrops in the surf zone tend to recover slowly and long-term sediment loss was identified in cases where storm damaged beaches have not recovered to pre-erosion levels.
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Ferderber, Megan Lynn, Christina Rizk, Shellie Zsoldos, Stacey Meardon, and Chia-Cheng Lin. "Concussion Recovery in Children and Adolescents: A Retrospective Study." Orthopaedic Journal of Sports Medicine 10, no. 12 (December 1, 2022): 232596712211434. http://dx.doi.org/10.1177/23259671221143486.
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Background: Concussion is a common injury among children and adolescents, with a growing body of literature supporting a variety of diagnostic and treatment modalities. Recovery is variable and depends on multiple factors that can be evaluated through a clinic visit: a thorough history, physical examination, and use of the Post-concussion Symptom Scale (PCSS). Purpose/Hypothesis: The purpose of this study was to evaluate factors associated with overall recovery from concussion in children and adolescents in the clinical setting. It was hypothesized that the presence of 1 of a number of pre- or postinjury characteristics will be associated with poor concussion recovery. Study Design: Case-control study; Level of evidence, 3. Methods: We conducted a retrospective chart review of adolescents and children aged 6 to 17 years with a diagnosis of concussion who were evaluated at a single sports medicine center between January 2015 and December 2019. Cases were categorized into recovered (PCSS <7) and poorly recovered (PCSS ≥7) cohorts based on the last PCSS scores during clinical follow-ups for concussion management. Results: Of the 162 charts reviewed, 110 cases met inclusion criteria. Significant statistical differences were found between the recovered and poorly recovered cohorts regarding mean days from injury to last clinic visit, previous migraine diagnosis, and emergency room (ER) visit before the first clinic visit ( P < .01 for all). Binary logistic regression analysis revealed that the most predictive factors associated with poorer recovery were having an ER visit before the first clinic evaluation ( P = .01) and previous migraine diagnosis ( P = .04). Conclusion: While many factors may contribute to overall recovery from concussion in pediatric populations, our study suggested that a history of migraine and an ER visit before clinic evaluation may be associated with poor recovery of concussive symptoms.
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Laubitz, Daniel, Katri Typpo, Monica Midura-Kiela, Clairessa Brown, Albert Barberán, Fayez K. Ghishan, and Pawel R. Kiela. "Dynamics of Gut Microbiota Recovery after Antibiotic Exposure in Young and Old Mice (A Pilot Study)." Microorganisms 9, no. 3 (March 20, 2021): 647. http://dx.doi.org/10.3390/microorganisms9030647.
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Antibiotics have improved survival from previously deadly infectious diseases. Antibiotics alter the microbial composition of the gut microbiota, and these changes are associated with diminished innate immunity and decline in cognitive function in older adults. The composition of the human microbiota changes with age over the human lifespan. In this pilot study, we sought to identify if age is associated with differential recovery of the microbiota after antibiotic exposure. Using 16S rRNA gene sequencing, we compared recovery of the gut microbiota after the 10-day broad-spectrum antibiotic treatment in wild-type C57BL/six young and older mice. Immediately after antibiotic cessation, as expected, the number of ASVs, representing taxonomic richness, in both young and older mice significantly declined from the baseline. Mice were followed up to 6 months after cessation of the single 10-day antibiotic regimen. The Bray-Curtis index recovered within 20 days after antibiotic cessation in young mice, whereas in older mice the microbiota did not fully recover during the 6-months of follow-up. Bifidobacterium, Dubosiella, Lachnospiraceae_NK4A136_group became dominant in older mice, whereas in young mice, the bacteria were more evenly distributed, with only one dominant genus of Anaeroplasma. From 45 genera that became extinct after antibiotic treatment in young mice, 31 (68.9%) did not recover by the end of the study. In older mice, from 36 extinct genera, 27 (75%) did not recover. The majority of the genera that became extinct and never recovered belonged to Firmicutes phylum and Clostridiales family. In our study, age was a factor associated with the long-term recovery of the gut microbiota after the 10-day antibiotic treatment.
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Melinda Noer, Werry Darta Taifur, Sosmiarti Syafruddin Karimi. "The Study of Post-Earthquake Livelihood Strategy in Tandikek Padang Pariaman District." International Journal of Agricultural Sciences 2, no. 2 (December 18, 2018): 79. http://dx.doi.org/10.25077/ijasc.2.2.79-87.2018.
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The objective of this study is to investigate life asset condition and household life recovery strategy after and before earthquakes in Tandikek, Padang Pariaman District. Livelihood index assessment is used to describe livelihood asset changes before and after the earthquake. A descriptive analysis is employed to describe life recovery strategy that is used by households in various level and phase of house damages. The result of the study shows that change in household life asset after the earthquake has U pattern, meaning that condition of assets for all indicators decreased during emergency and recovery phases. This condition, however, increased after recovery phase up to the present time. The condition is even better than that prior to the earthquake. This also means that all recovery efforts have successfully developed people’s life assets that guarantee their life after the earthquake. The livelihood recovery strategy used by households in Tandikek to maintain and recover their livelihood varies according to the level and phase of the house damage. The households that take independent livelihood strategy, either in active or passive way, networking strategy and utilization of disaster aids from various sources appear to recover faster than those who only take one strategy.
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Yairi, Ehud, and Nicoline Ambrose. "A Longitudinal Study of Stuttering in Children." Journal of Speech, Language, and Hearing Research 39, no. 4 (August 1996): 826. http://dx.doi.org/10.1044/jshr.3904.826.
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It has come to our attention that minor errors occurred in Table 3 on p. 759 of the Yairi and Ambrose article, "A Longitudinal Study of Stuttering in Children: A Preliminary Report," which appeared in the August 1992 issue (Vol. 35, pp. 755–760). A revised version of the table appears below that includes both the original values and the corrected values (in boldface). As can be seen, the differences are indeed minor. The changes do not affect the reported patterns or level of statistical significance. In the untreated group, 7 or 78% recovered by 24 months post-onset and 1 additional subject recovered later, making a total recovery rate of 89%, with 11% persistent. In the treated group, 11 or 61% recovered by 24 months post-onset and an additional 5 recovered later, again totalling 89% recovery and 11% persistent. These data do not in any way indicate that treatment is not beneficial nor that it has no effect but simply that success rates for treated individuals must take spontaneous recovery into account. We regret the error.
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Jouper, John, and Henrik Gustafsson. "Mindful Recovery: A Case Study of a Burned-Out Elite Shooter." Sport Psychologist 27, no. 1 (March 2013): 92–102. http://dx.doi.org/10.1123/tsp.27.1.92.
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Research on how to recover from athlete burnout is scarce. The current aim is therefore to describe an intervention with an elite shooter suffering from burnout, and the use of mindfulness and Qigong to reestablish sport functioning as well as general well-being. The participant used mindfulness and Qigong exercise on a daily basis. Exercise frequency, exercise time, concentration level and Qigong state were noted daily, and levels of stress, energy and primordial force were self-rated weekly for 20 weeks, and followed up after 30, 40 and 50 weeks. The participant recovered from burnout to a state of general well-being (energy and primordial force changed from weak to strong), and her ability to stay concentrated in a Qigong state changed from weak to strong. Her capacity to shoot high scores was reestablished, even if her shooting endurance was not fully recovered. Mindfulness and Qigong techniques may be useful in the prevention of and recovery from athlete burnout.
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Madlool, N. A., R. Saidur, and N. A. Rahim. "Investigation of Waste Heat Recovery in Cement Industry: A Case Study." International Journal of Engineering and Technology 4, no. 5 (2012): 665–67. http://dx.doi.org/10.7763/ijet.2012.v4.457.
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Thomas, Luke, and Stephen R. Palumbi. "The genomics of recovery from coral bleaching." Proceedings of the Royal Society B: Biological Sciences 284, no. 1865 (October 25, 2017): 20171790. http://dx.doi.org/10.1098/rspb.2017.1790.
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Ecological damage from periodic environmental extremes is often repaired in resilient ecosystems, but the rate of return to a non-damaged state is critical. Measures of recovery of communities include biomass, productivity and diversity, while measures of recovery of individuals tend to focus on physiological conditions and the return to normal metabolic functioning. Transcriptomics offers a window into the entire physiology of the organism under stress and can represent a holistic view of organismal recovery. In this study, we track the recovery of seven colonies of Acropora hyacinthus following a natural bleaching event. We identified a large environmental stress response in the field that involved approximately 20% of the host transcriptome. The transcriptome remained largely perturbed for at least six months after temperatures had cooled and four months after symbiont populations had recovered. Moreover, a small set of genes did not recover to previous expression levels even 12 months after the event, about the time that normal growth rates resumed. This study is among the first to incorporate transcriptomics into a longitudinal dataset of recovery from environmental stress. The data demonstrate large and lasting effects on coral physiology long after environmental conditions return to normal and symbiont populations recover.
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Zhang, Haitao, Ying Wang, Zuoqiang Liu, and Quansheng Sun. "Study on Mechanical Behavior of Aging Asphalt Based on Composite Regeneration and Modification." Advances in Materials Science and Engineering 2020 (March 16, 2020): 1–11. http://dx.doi.org/10.1155/2020/1325048.
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Although the aging asphalt and its regeneration were researched by many researchers, the poor low-temperature performance of regenerating asphalt has still not been solved yet. In this project, the composite technology of regeneration and modification will be used to solve the problem mentioned above. Through the investigation and analysis on the composite mechanism of regeneration and modification for aging asphalt, the objective of the project attempts to explore a method for the synchronized recovery of high- and low-temperature performance of aging asphalt. The research results show that the single regenerating technology cannot fully recover the low-temperature performance of aging asphalt, and the composite technology of regeneration and modification can make the performance of aging asphalt recovery well. The indexes of aging asphalt after composite regeneration and modification have been recovered, which are better than the indexes of 90# asphalt (25°C penetration is 80–100/0.1 mm) and close with the indexes of styrene-butadiene-styrene (SBS) modified asphalt. The project has demonstrated that the composite technology of regeneration and modification can make the high- and low-temperature performance of aging asphalt recovery well. The research results can obtain better economic and social benefits.
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Yamaguchi, Kenji, and Yukari Shirota. "Classification of Japanese Electrical Equipment Manufacturing Industry Recovery Patterns after Disasters: Case Study of August 2019." International Journal of Trade, Economics and Finance 11, no. 6 (December 2020): 150–55. http://dx.doi.org/10.18178/ijtef.2020.11.6.681.
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In the paper, we analyze the recovery pattern of Japanese electrical equipment manufacturing companies after the President Trump remark in August 2019. The President’s remark made the companies’ stock prices decreased severely. The research consists of two parts. In the first part, we conducted Random Matrix Theory to extract representative decline/recovery patterns. Then we tagged A/B/C/D to the companies’ recovery types. The class A means a strong recover power. Then as the second part, we conducted machine learning tree-based classification using the tags A/B/C. The predictors are eight variables like ROA, ROE, and VAR. The resultant Decision Tree model provided us with the two different approaches to the class A group. The recovery and repulsion power will be higher in the company with high ROA and in the company that manufactured the product with high VAR. In addition, another class A company group is made and the feature is the high inventory turnover ratio.
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Smith, Nola. "Reading recovery: A case study." Set: Research Information for Teachers, no. 1 (June 1, 1999): 1–4. http://dx.doi.org/10.18296/set.0832.
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Ladista, Rindy Dwi. "Economic Recovery: A Bibliometric Study." Studi Ekonomi dan Kebijakan Publik 1, no. 2 (January 3, 2023): 97–108. http://dx.doi.org/10.35912/sekp.v1i2.1491.
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Abstract: Purpose: This study aims to determine the characteristics of previous studies on economic recovery Research Methodology: This research is a bibliometric study using the charting the field method developed by Hesford et al., (2006). Results: 46 articles from 2021-2022 were obtained from the Sinta accredited journal with the keyword economic recovery. The majority articles are from 2021, Sinta 5, economic journal, used qualitative research, secondary data sources. Last, three strategies most discussed were empowerment of MSMEs, the provision of social assistance, and the use of Islamic financial instruments. Limitations: This study uses only two of the three classifications developed by Hesford et al (2006). Contribution: The novelty in this research is to propose a new classification based on the focus and scope of journals, Sinta's accreditation rating, types of research, types of data sources, data collection methods, and economic recovery strategies discussed. Keywords: 1. Econometric Recovery 2. Covid-19 3. Bibliometrics
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Wootton, Daniel G., Laura Dickinson, Henry Pertinez, Joanne Court, Odiri Eneje, Lynne Keogan, Laura Macfarlane, et al. "A longitudinal modelling study estimates acute symptoms of community acquired pneumonia recover to baseline by 10 days." European Respiratory Journal 49, no. 6 (June 2017): 1602170. http://dx.doi.org/10.1183/13993003.02170-2016.
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Our aims were to address three fundamental questions relating to the symptoms of community-acquired pneumonia (CAP): Do patients completely recover from pneumonia symptoms? How long does this recovery take? Which factors influence symptomatic recovery?We prospectively recruited patients at two hospitals in Liverpool, UK, into a longitudinal, observational cohort study and modelled symptom recovery from CAP. We excluded patients with cancer, immunosuppression or advanced dementia, and those who were intubated or palliated from admission. We derived a statistical model to describe symptom patterns.We recruited 169 (52% male) adults. Multivariable analysis demonstrated that the time taken to recover to baseline was determined by the initial severity of symptoms. Severity of symptoms was associated with comorbidity and was inversely related to age. The pattern of symptom recovery was exponential and most patients’ symptoms returned to baseline by 10 days.These results will inform the advice given to patients regarding the resolution of their symptoms. The recovery model described here will facilitate the use of symptom recovery as an outcome measure in future clinical trials.
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Nakata, Hiroki, Ryusuke Kakigi, and Manabu Shibasaki. "Effects of passive heat stress and recovery on human cognitive function: An ERP study." PLOS ONE 16, no. 7 (July 20, 2021): e0254769. http://dx.doi.org/10.1371/journal.pone.0254769.
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Using event-related potentials (ERPs), we investigated the effects of passive heat stress and recovery on the human cognitive function with Flanker tasks, involving congruent and incongruent stimuli. We hypothesized that modulation of the peak amplitude and latency of the P300 component in ERP waveforms would differ with task difficulty during passive heat stress and recovery. Subjects performed the Flanker tasks before (Pre), at the end of whole body heating (Heat: internal temperature increase of ~1.2°C from the pre-heat baseline), and after the internal temperature had returned to the pre-heat baseline (Recovery). The internal temperature was regulated by a tube-lined suit by perfusing 50°C water for heat stress and 25°C water for recovery immediately after the heat stress. Regardless of task difficulty, the reaction time (RT) was shortened during Heat rather than Pre and Recovery, and standard deviations of RT (i.e., response variability) were significantly smaller during Heat than Pre. However, the peak amplitudes of the P300 component in ERPs, which involved selective attention, expectancy, and memory updating, were significantly smaller during Heat than during Pre, suggesting the impairment of neural activity in cognitive function. Notably, the peak amplitudes of the P300 component were higher during Recovery than during Heat, indicating that the impaired neural activity had recovered after sufficient whole-body cooling. An indicator of the stimulus classification/evaluation time (peak latency of P300) and the RT were shortened during Heat stress, but such shortening was not noted after whole-body cooling. These results suggest that hyperthermia affects the human cognitive function, reflected by the peak amplitude and latency of the P300 component in ERPs during the Flanker tasks, but sufficient treatment such as whole-body cooling performed in this study can recover those functions.
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Dang, Xiao E., Xin Zhe Lan, and Yuan Dong. "Study on Recovering of Value Metals from Acid Leaching Solution of Roasted Electroplating Sludge." Advanced Materials Research 524-527 (May 2012): 1951–55. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1951.
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Chelating electroplating sludge contains high grade of toxic metals or heavy metals, so this sludge should be treated and recovered of valuable metals from it. This paper mainly studied on the recovery process of Copper, Nickel and Zinc process from sulfuric acid leaching solution of roasted chelating electroplated sludge. It provided an effective technique for recovery of valuable metals from acid leaching solution. The efficiency of the process had been measured with the metal recovery rate. Experimental results showed that recovery rate of Copper and Nickel can respectively achieve at 99.30% and 97.00% from acid leaching solution after removal iron with zinc powder used reducing agent. The process has simple operation and high recovery rate. It can solve the environmental pollution problem of electroplating sludge and valuable metals can be recovered from which. It could bring better economic and environmental benefits to the enterprise.
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Kabundi, Vianney Bihibindi, Camille Kayihura, Onesmus Marete, Nicodeme Habarurema, and Erigene Rutayisire. "Factors Influencing Recovery among Children with Moderate Acute Malnutrition Treated at Kirehe District Health Centers." Journal of Public Health International 3, no. 1 (August 21, 2020): 20–27. http://dx.doi.org/10.14302/issn.2641-4538.jphi-20-3437.
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Acute malnutrition affects nearly 52 million of under five years children globally, 75% of them live in low to middle income countries. The treatment of acute malnutrition using supplement foods could help children recovering and could reduce the risk of sickness. The present study investigated the factors associated with recovery among children with moderate acute malnutrition (MAM) under a follow-up program at health facilities. A prospective study was conducted in 16 health centers of Kirehe District of Rwanda and included 200 children from 6 to 59 months. A semi-structured questionnaire was used for data collection. All children enrolled in the study spent three months in nutrition program at health centers. The results show that after 3 months in the program 77.5% recovered from MAM. Children aged above 36 to 59 months were recovered at 90% whereas children aged from 24-35 months were recovered at 73.5%. Micronutrients and deworming provided at health facility were contributed to the recovery as children who received them were recovered at 89.1% and for those who didn’t were recovery at 72.1%. The findings demonstrated that boys were 16 times more likely to recover from MAM in three months of intervention than girls (AOR=16.19, p<0.001, 95% CI: 5.39- 48.63). Children from moderate income families were 3 more likely to recover than those from very low income families (AOR=2.8, p=0.029, 95% CI: 1.11-7.51). Male gender, receiving micronutrients and deworming from health facilities and family income status were factors associated with MAM recovery status
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Bridle, T. R., and D. Pritchard. "Energy and nutrient recovery from sewage sludge via pyrolysis." Water Science and Technology 50, no. 9 (November 1, 2004): 169–75. http://dx.doi.org/10.2166/wst.2004.0562.
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Energy recovery and nutrient reuse from sewage sludge has traditionally been achieved via anaerobic digestion/power generation with land application of the biosolids. By contrast, thermal processes such as pyrolysis have typically been used only for energy recovery. One such technology has demonstrated at commercial scale that all of the energy in sludge can be beneficially recovered and reused. No attempt was however made to recover and reuse sludge nutrients. There are many potential benefits of using pyrolysis for both energy and nutrient recovery. Firstly, unlike digestion, the principal energy product is oil, which can readily be stored and used when required, ensuring that energy recovery is maximised. Secondly is that the sludge nutrients are recovered in the pyrolysis char. Laboratory soil incubation studies using char from the Subiaco demonstration plant were conducted over an eight-week period to confirm nutrient availability. Results from this study showed that the phosphorus in the char is plant available although the nitrogen was insoluble. Based on these results it appears that there is potential to use pyrolysis as an effective means to recover and reuse both the energy and the very valuable phosphorus present in sewage sludges.
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Chen, Ci Yun, Shu Ming Wen, Yong Jun Xian, Qi Cheng Feng, and He Fei Zhao. "Recovery of Iron from Tailings of Yangla Copper Ore by Magnetic Separation." Advanced Materials Research 634-638 (January 2013): 3442–45. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3442.
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Against the dwindling status of mineral resources at present, effective recycling of tailings resources is an effective way to alleviate the shortage of resources, and to improve enterprise efficiency. This study was aimed to recover iron from tailings of Yangla copper ore, Fe content of which was 15.31%, and the content of strong magnetic iron mineral was about 11%. Considering low content of weak magnetic iron mineral and its complex and costly recovery process, weak magnetic iron mineral did not be recovered, so strong magnetic iron mineral was only recovered in this study. Under no grinding condition, Fe recovery of 6.47% with iron grade of 60.87% was obtained. It effectively recovered strong magnetic minerals from tailings, and got enterprise increase additional revenue with good economic benefits.
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Mourits, B. M. P., M. Z. Meulekamp, P. van der Wurff, and C. Lucas. "Identifying prognostic factors to determine the level of recovery in servicemembers with chronic low back pain: A prospective cohort study." Journal of Back and Musculoskeletal Rehabilitation 34, no. 4 (July 13, 2021): 697–705. http://dx.doi.org/10.3233/bmr-200123.
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OBJECTIVE: The main objective of this study was to identify general and military-related factors that are associated with the level of recovery in Dutch service members with chronic low back pain (CLBP) who followed a rehabilitation program. MATERIAL AND METHOD: One hundred five consecutive service members with CLBP were included in this study. The level of disability, was used to distinguish a recovered and non-recovered group. Level of pain and self-perceived recovery were used as secondary outcome measurements. Differences were evaluated within and between the groups using the Student’s t-test Bivariate logistic regression analyses were used for identifying the prognostic factors related to various outcomes of recovery RESULTS: After following the rehabilitation program, 64.8% of the service members recovered from CLBP. The recovered group, demonstrated significant effect sizes in disability and in pain The non-recovered group showed on disability a non-significant effect and in pain a significant effect. The self-perceived recovery in the recovered group was “much improved” and the non-recovered group “slightly improved”. The results of the bivariate regression analyses showed no significant independent prognostic factors related to recovery. CONCLUSIONS: In this study, no significant independent prognostic factors could be identified that were associated to the various outcomes of recovery in service members with CLBP who followed a rehabilitation program.
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Shetty, Teena, Joseph Nguyen, Taylor Cogsil, Apostolos John Tsiouris, Sumit Niogi, Aashka Dalal, Kristin Halvorsen, et al. "Recovery time, risk factors, and volumetric analysis in acute mTBI." Neurology 91, no. 23 Supplement 1 (December 4, 2018): S17.2—S17. http://dx.doi.org/10.1212/01.wnl.0000550694.07808.1a.
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ObjectiveThis study investigated the influence of demographic factors, the course of recovery, and the utility of investigational MR sequences (specifically volumetry) in mild traumatic brain injury (mTBI) patients.BackgroundMost literature suggests that the majority of mTBI patients achieve recovery within 1 month of injury, or sooner. This may be affected by younger age, female sex, concussion history, learning disability, psychiatric history, or migraines. The role of volumetric analysis in mTBI requires further investigation.MethodsOne hundred eleven patients (15–50 years old) enrolled in the study within 10 days of head injury. Patients completed a maximum of 4 encounters over 3 months, undergoing volumetric structural imaging at each visit. Patients were contacted to determine recovery date.ResultsRecovery date was obtained in 73 patients at HSS. The median days to recovery was 44 days (IQR: 23–88 days). 33% of this population was recovered in 30 days, 63% in 60 days, and >75% in 90 days. Of the subjects who were not recovered by 90 days, the right thalamus volume trended towards a negative correlation with SSS at that time point. Initial symptom severity score (SSS) was significantly correlated with increased days to recovery (p = 0.382, p = 0.001). Average days to recover was longer in patients with diagnosed depression, anxiety, or other psychiatric disorder (121 vs 70 days, p = 0.037). No significant differences in days to recovery were found between age groups, sex, learning disorder, previous concussions, or history of migraines.ConclusionAverage time to recover from mTBI may be longer than previously reported. Acute SSS may be a useful indicator in determining recovery time. Of previously reported risk factors, personal psychiatric history may have the greatest effect on recovery time. Despite being interesting, the volumetric correlations did not survive multiple comparison corrections and may not be the most sensitive variable for mTBI imaging.
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Hu, Ting, Quan Jun Liu, Rong Dong Deng, and Feng Hong Ye. "Experimental Research of Tin Ore from Kazakhstan." Advanced Materials Research 581-582 (October 2012): 949–53. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.949.
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The paper recovered the tin from a refractory tin ore in Kazakhstan. The grade of tin in raw ore is 1.19%. Through technological mineralogy study, we found the tin was mainly in the forms of cassiterite and stannite. Considering the gravity process would make the stannite lost in tailings because of its small specific gravity, we explored the flotation to recover the tin. In fact, the grade and recovery of tin were bad by collectors contrast test. Finally, we adopted gravity flowsheet to recover cassiterite. The recovery of tin is not high because the tin in the form of stannite lost in tailings. As a result, the tin concentrate with a grade of 21.56% and the recovery of 52.90% were obtained.
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TSUCHIHASHI, TOSHIO, TOSHIO MAKI, and TAKESHI SUZUKI. "Study of the Fast Inversion Recovery Pulse Sequence: : With Reference to Fast Fluid Attenuated Inversion Recovery and Fast Short TI Inversion Recovery Pulse Sequence." Japanese Journal of Radiological Technology 53, no. 2 (1997): 291–98. http://dx.doi.org/10.6009/jjrt.kj00003109749.
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Skaalsvik, Hugo. "Why service recovery fails: A case study on the Norwegian Coastal Voyage (Hurtigruten)." European Journal of Tourism Research 5, no. 2 (October 1, 2012): 129–52. http://dx.doi.org/10.54055/ejtr.v5i2.102.
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This paper deals with a service recovery study carried out on the prestigious Norwegian Coastal Voyage (NCV) or the Hurtigruten, which is the brand name. The research is based on a collection of 51 service failure incidents, of which 16 were recovered by the service provider. However, 35 service failure incidents were not recovered, and the paper documents why service recovery failed in these cases on the Hurtigruten. The findings show that the service actors, the service leadership due to lack of service competencies, the service employees due to lack of knowledge, skills and empowerment, and the customers themselves due to their own attitudes and behaviours explain why service recovery failed.
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Pemmadi, Venkata Rao, JInal Patel, and Ashish Nagar. "Enhanced Oil Recovery." International Journal for Research in Applied Science and Engineering Technology 11, no. 2 (February 28, 2023): 834–41. http://dx.doi.org/10.22214/ijraset.2023.48875.
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Abstract: Enhanced oil recovery procedures, which are part of improved oil recovery, are used to recover the leftover oil include Steam injection, Polymer flooding, Gas injection and Water injection. Only a small percentage of the total hydrocarbons in the reservoir can be recovered using standard oil recovery technologies. Even if normal recovery procedures are implemented, almost 2 trillion barrels of conventional oil and 5 trillion barrels of heavy oil will remain in reservoirs around the world. Many factors, both economic and technological, influence the strategy chosen and the projected recovery. The study evaluates the EOR approaches that are currently in use in the field. The current EOR technologies are put into context, with the technical reasons for their failure highlighted. Recovering additional oil is difficult and expensive, and it has only been done successfully in a few cases under strict conditions. Despite this, EOR will continue to play a significant role in oil production due to rising energy demand and constrained supply. It is estimated that a significant amount of research is required to develop new technologies for recovering almost two-thirds of the oil that remains unrecoverable in the reservoir. New methods of enhanced oil recovery improves the efficiency of existing processes and reduce demand for new reserves in the longer term. This paper represents the new technologies evolved in the petroleum industry for Enhanced oil recovery.
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Wojnicki, M., T. Tokarski, and P. Kwolek. "Kinetic Study of The Photoelectrochemical Gold Recovery from Diluted Chloride Solutions." Archives of Metallurgy and Materials 58, no. 3 (September 1, 2013): 709–16. http://dx.doi.org/10.2478/amm-2013-0059.
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Abstract Au(III) was recovered from an acidic aqueous solution via a photoreduction technique under UV light irradiation. Titanium dioxide nanopowder was applied as a photocatalyst. Gold was deposited onto TiO2 surface in the form of nanoparticles with average dimensions between 20 and 30 nm. The influence of the Au(III), TiO2 and methanol initial concentrations on the reaction rate was determined. It was shown, that the rate of the gold photoreduction strongly depends on the concentration of TiO2 and methanol. The recovery of gold from the diluted acidic solutions containing as much as 1.97 and 0.197 mg/dm3 of Au(III) was also carried out. Obtained results suggest, that it is possible to recover about 45% of gold. Besides the losses during the filtration process due to the application of very fine TiO2 particles, oxygen dissolved in the solution as well as the hydrogen ions may take part in parasitic reactions and thus decrease the Au yield.
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Alias, S., and N. A. Abdul-Hakim. "Terephthalic Acid (TPA) Recovery from Plastic Bottle of Polyethylene Terephthalate (PET) through Hydrolysis Treatment." IOP Conference Series: Materials Science and Engineering 1257, no. 1 (October 1, 2022): 012007. http://dx.doi.org/10.1088/1757-899x/1257/1/012007.
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Abstract Recovery of plastic waste has a positive influence on solid waste management as it can bring new life to plastic waste. Hydrolysis treatment is one of the approaches for plastic waste recovery, in which plastic monomer can be recovered through depolymerisation. This study explored the recovery of polyethylene terephthalate (PET) plastic in nitric acid and leachate. The weight changes were analysed in PET when exposed to different hydrolysis agents (nitric acid and leachate) at different reaction times and temperatures. The monomer recovery of PET, known as terephthalic acid (TPA), was also evaluated. It was found that high temperatures and reaction times promoted to the high recovery of TPA. The PET residue measured as weight difference was found in line with the trend of TPA yield. The hydrolysis using nitric acid can recover more TPA than the leachate system. The knowledge obtained from this study would be beneficial in upcycling plastic waste into high-value end products.
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Clay, Fiona J., Swati Shourie, Priscilla Robinson, Donna McKenzie, and Emily Kerr. "Injured Workers Perspectives on Recovery following Non-Life-Threatening Acute Orthopaedic Trauma: A Descriptive Study." ISRN Rehabilitation 2014 (February 23, 2014): 1–12. http://dx.doi.org/10.1155/2014/394357.
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Background. Little is known about the recovery process following non-life-threatening acute orthopaedic trauma from the viewpoint of the injured person. A better understanding could facilitate optimal rehabilitative planning. Objective. To explore patients’ views on factors important to them in recovery following non-life threatening acute orthopaedic trauma. Methods. Descriptive study utilizing content analysis and chi-square analysis. To better understand recovery expectations, 168 adults who had sustained non-life threatening acute orthopaedic trauma were surveyed at 2, 12, and 26 weeks after injury and invited to respond to the following question “what are the most important things necessary for you to best recover?” Results. According to participant’s responses, major themes on recovery involved a return to health and a return to health but with an ongoing plan, and for a minority (12%) recovery involved a focus on their current status. The study found that some recovery expectations changed over time. Conclusion. The journey to recovery is complex, often prolonged, and highly individual. Responses suggest that some injured persons need more assistance for a successful recovery than others. Those who appeared “caught in the moment” of the injury may benefit from clinical and rehabilitative management focusing on long-term recovery and acceptance of the injury event.
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Wang, Xuan Ya, and Yao Bing Wang. "VOCs Recovery Energy-Saving Efficiency Decision and Case Study." Advanced Materials Research 805-806 (September 2013): 580–86. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.580.
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Promote VOCs (volatile organic chemicals) and re-use recovered oil as secondary energy can reduce environmental pollution meantime bring lots of energy-saving and socioeconomic benefits. Related data shows that install VOCs recovery unit (VRU) can produce large quantity of energy-saving efficiency. However, China currently has no related energy-saving efficiency evaluation methods, which makes barriers for promoting VOCs technology. This paper lists the key elements that response for VRU energy-saving efficiency, provide computational formulas which focus on VRU recovery benefits, take a case study for example and calculation the energy-saving benefit that VRU can bring. From the data comparison analyzes the relationship between VRU recovery rate, emission limits and energy consumption. At very end of this paper, some suggestion for better setting emission standard also is given.
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Xu, Ying, Yan Qing Cai, Xiang Lu, and Peng Hua Ma. "Study on Recovery of Vanadium from Low-Vanadium Slag by Calcified Roasting Methods." Advanced Materials Research 284-286 (July 2011): 2127–30. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2127.
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Vanadium was recovered by using technology of calcified roasting→alkali leaching→ion exchange→precipitating→deaminizing, the principles of this recovery process were described in detail. Through the experiments, the parameters of roasting, leaching and ion exchange were determined, a new operational, low-polluting method to recovery vanadium was formed. This method not only can overcame the disadvantage of traditional technology, such as long process, serious pollution, but also has advantages such as high recovery and high purity of vanadium. In this study, pure V2O5 products with national standard were obtained. The total recovery was up to 65% or more, which was higher than that of the sodium roasting methods.
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Wu, Chenkai, Dae H. Kim, Qian-Li Xue, David S. H. Lee, Ravi Varadhan, and Michelle C. Odden. "Association of Frailty With Recovery From Disability Among Community-Dwelling Older Adults: Results From Two Large U.S. Cohorts." Journals of Gerontology: Series A 74, no. 4 (April 10, 2018): 575–81. http://dx.doi.org/10.1093/gerona/gly080.
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Abstract Background Disability in activities of daily living (ADLs) is a dynamic process and transitions among different disability states are common. However, little is known about factors affecting recovery from disability. We examined the association between frailty and recovery from disability among nondisabled community-dwelling elders. Methods We studied 1,023 adults from the Cardiovascular Health Study (CHS) and 685 adults from the Health and Retirement Study (HRS), who were ≥65 years and had incident disability, defined as having difficulty in ≥1 ADL (dressing, eating, toileting, bathing, transferring, walking across a room). Disability recovery was defined as having no difficulty in any ADLs. Frailty was assessed by slowness, weakness, exhaustion, inactivity, and shrinking. Persons were classified as “nonfrail” (0 criteria), “prefrail” (1–2 criteria), or “frail” (3–5 criteria). Results In total, 539 (52.7%) CHS participants recovered from disability within 1 year. Almost two-thirds of nonfrail persons recovered, while less than two-fifths of the frail recovered. In the HRS, 234 (34.2%) participants recovered from disability within 2 years. Approximately half of the nonfrail recovered, while less than one-fifth of the frail recovered. After adjustment, prefrail and frail CHS participants were 16% and 36% less likely to recover than the nonfrail, respectively. In the HRS, frail persons had a 41% lower likelihood of recovery than the nonfrail. Conclusions Frailty is an independent predictor of poor recovery from disability among nondisabled older adults. These findings validate frailty as a marker of decreased resilience and may offer opportunities for individualized interventions and geriatric care based on frailty assessment.
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Pinsker, Ellie, Monique A. M. Gignac, Joanna E. M. Sale, Timothy R. Daniels, and Dorcas E. Beaton. "Understanding “Recovery” Following Ankle Reconstruction: A Qualitative Study." Foot & Ankle Orthopaedics 4, no. 4 (October 1, 2019): 2473011419S0034. http://dx.doi.org/10.1177/2473011419s00340.
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Category: Ankle, Ankle Arthritis, Outcomes research Introduction/Purpose: Patients’ perception of a good outcome (‘feeling recovered’) is not fully understood. A clear understanding of the benefits and harm of a surgery is necessary for clinical decision-making. Qualitative work exploring the nature of patient recovery would improve our ability to understand and measure these outcomes. The purpose of the study is to examine patients’ perceptions of post-surgical outcome following ankle reconstruction for treatment of end-stage ankle arthritis. Methods: Twenty-five English-speaking individuals were asked to participate following a routine clinic visit. They were recruited from an existing cohort of persons who had undergone total ankle replacement or ankle fusion at least one year prior. A qualitative researcher conducted semi-structured, face-to-face interviews with participants in a private hospital room. Results: Twenty-five adults (12 women, 13 men) ages 25–82 years were interviewed for 1-2 hours. Participants varied in their socioeconomic status and education levels. Patients did not view their recovery simply as physiological change. Most participants reported ongoing challenges or difficulties, yet considered themselves better. Participants described a broader concept of recovery with multiple contributing factors, including appraisal of the importance of ongoing issues and coping efforts. When participants experienced ongoing difficulty with valued activities, they gained a sense of recovery using coping efforts. Many ‘readjusted’ behaviorally to continue with their valued goals and activity preferences. Others cognitively redefined their goals or preferences to accommodate their ongoing issues. Participants who could not cope with their difficulties or disliked their coping effort perceived their recovery negatively. Conclusion: Perception of recovery and experience of outcome rarely involved resolution of all symptoms and functional limitations. The manner in which patients described their recovery was typically more nuanced than a simple change in magnitude of symptoms or functional limitations. This research expands our understanding of the experience of ankle reconstruction and draws attention to different meanings of recovery that has implications for outcome evaluation and measurement. Improved measures for evaluating the recovery outcome states will enable clinicians to identify facilitators and barriers to recovery.
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Yoshida, Hiroshi, Masayuki Takada, and Shinzo Yoshikado. "Study on Recovery of Electrical Degradation of ZnO Varistors." Key Engineering Materials 350 (October 2007): 209–12. http://dx.doi.org/10.4028/www.scientific.net/kem.350.209.
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The relationship between the crystal structure of Bi2O3 and the recovery of the electrical degradation of ZnO varistors was investigated. The evaluation methods used were analysis of the voltage-current (V-I) characteristics, scanning electron microscopy (SEM), energy-dispersion X-ray spectroscopy (EDX), and X-ray diffraction (XRD) measurements. The electrical degradation was estimated by the nonlinearity of the V-I characteristics. A marked recovery of the nonlinearity of the V-I characteristics was observed for a sample having the crystal structure of δ-type Bi2O3. It is speculated that the electrical degradation is markedly recovered for optimum conditions of both the amount and the crystal structure of the added Bi2O3, because, for samples sintered for a long time, the recovery speed is shorter than that for samples sintered for a shorter time. During long-time sintering, the amount of Bi2O3 decreased because of evaporation. No change of the crystal structure of Bi2O3 was observed upon repeated the electrical degradation and the recovery. It is suggested that another mechanism apart from the diffusion of oxygen ions through the grain boundaries of ZnO particles contributes to the electrical degradation and recovery of the nonlinearity of V-I characteristics.
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Idaham, Nurul Fasihah, Mohamad Azmi Bustam Khalil, and Chong Fai Kait. "Study on the Recovery of 1-butyl-3-methylimidazolium-based Ionic Liquids." Applied Mechanics and Materials 625 (September 2014): 144–47. http://dx.doi.org/10.4028/www.scientific.net/amm.625.144.
Full textAbstract:
Nowadays, ionic liquids have been widely used in desulfurization process. However, the synthesis costs, performance efficiencies and problems related to waste waters contaminated with ionic liquids are the major issues that need to be considered. Thus, recovery method is one of the alternatives to overcome the current issues. 1-butyl-3-methylimidazolium-based ionic liquids with three different anions: dicyanamide (N(CN)2), thiocyanate (SCN) and methylsulfate (CH3SO4) were chosen for the study because they are the common ionic liquids used in desulfurization. The recovery process used is water washing which is the cheapest and easiest recovery method. Even though the contaminants in the spent ionic liquids can easily be removed, we found that the recovered ionic liquids contained higher percentage of water as compared to the pure and spent ionic liquids. Thus, the aim of this current work is to study on the feasibility of the spent ionic liquids to be recovered and their performance on desulfurization after being recovered.
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Maurich, David. "Experimental Study of the Effect of Continuous Surfactant Injection Alternating Cyclic Huff & Puff Stimulation on Oil Efficiency Recovery in A 3D Reservoir Physical Model." JOURNAL OF APPLIED SCIENCE (JAPPS) 1, no. 2 (August 15, 2019): 018–30. http://dx.doi.org/10.36870/japps.v1i2.49.
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Surfactant can displace oil which trapped by capillary effect, make it easier to be produced and finally improve oil recovery factor. However, the effectiveness of surfactant injection depends on many parameters such as surfactant-reservoir fluids properties and interaction, reservoir characteristics and its interaction with surfactant and also surfactant injection scenario or operational methods. This paper discusses about the effect of continuous surfactant injection alternating huff & puff stimulation on oil recovery factor from a quadrant of five-spot pattern in a 3D physical model made from a mixture of sands, cement and water with dimension of 15 cm x 15 cm x 2.5 cm to serve as the surrogate for oil reservoir in laboratory. In order to simulate the oil recovery from a secondary waterflooding process, 0.17 PV of formation water was injected into 3D reservoir physical model. This process could recover about 25.5% OOIP from the physical model, however the injection then shortly terminated due to a drastically increase of watercut. Residual oil then be recovered by a sequence of continuous surfactant injection alternating huff and puff stimulation method. The recovery factor by continuous surfactant injection combine with chase water drive gave a 5.5 % OOIP additional recovery and another 6.8 % OOIP after 24 hours surfactant huff & puff stimulation in the first sequence. After conducting 3 series of a combination of continuous surfactant injection alternating huff & puff stimulation, the total oil recovery from overall processes was about 51.7% OOIP. We presume that the lack of mobility control on macroscopic sweep efficiency in a 3D reservoir physical model is the rationale behind this moderate oil recovery which only produced by surfactant microscopic displacement efficiency. Nevertheless, the research shows that the combination of continuous surfactant injection alternating huff & puff stimulation obviously improve the recovery factor to some extent.
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Kim, Su Jin. "Purification of Indole Contained in Wash Oil by Combination of Extraction and Crystallization (Part 1: Recovery and Concentration of Indole Contained in Wash Oil by Solvent Extraction)." Molecules 27, no. 16 (August 21, 2022): 5331. http://dx.doi.org/10.3390/molecules27165331.
Full textAbstract:
For the purpose of determining the high-purity purification of indole (IN) contained in wash oil in concentrations of 5.75%, this study, first of all, investigated the concentration of IN contained in wash oil using a combination of methanol extraction to recover IN in the wash oil, and n-hexane re-extraction to concentrate IN present in the extract phase, recovered through methanol extraction. In order to examine the effect of each operation on the recovery and concentration of IN contained in the wash oil, batch 1-stage and batch co-current 5-stage distribution equilibrium was performed simultaneously. As 5-stage equilibrium extraction and re-extraction progressed, the recovery rate of IN decreased to about 79.1%, while IN composition in the raffinate phase recovered by re-extraction was highly concentrated to about 73.3%. From the high recovery rate and composition of IN obtained through this study, we confirmed that the combination examined by this study was one of the very useful combinations for the concentration of IN present in the wash oil. Furthermore, we reviewed the recovery and concentration process of IN contained in the wash oil using the experiment results of the extraction and the re-extraction obtained from this study.