bluuebunny/crossref_metadata_2025_split huggingface dataset:
Degradation and health prediction of filter components of screw compressor
Authors: Li Fengyu , Liu Xiaoming , Liu Zhilong , Yu Yang 
Published: April 2022

Abstract
In the oil screw compressor unit, the filtration device of gas and oil will have an impact on the overall operation of the unit. This paper studies the degradation of the filtration components in the long-term experiment. The experimental results show that with the increase of operation time, the fuel injection device, air cooling device, oil cooling device and oil filter device appear obvious degradation. The fuel injection temperature decreases, the inlet and outlet temperature difference of air cooling and oil cooling device increases, and the inlet and outlet pressure difference of oil filter device increases. Through the calculation of Mahalanobis distance, it is found that the degradation of each device corresponds to the degradation of the whole unit, and the degradation of oil filter device occurs first, followed by air cooling and oil cooling device, and affects the main engine from the fuel injection device. Through the calculation and comparison of artificial neural network, the optimal number of hidden layer neurons corresponding to the prediction model is determined.
Automatic control design of light wall panel production line
Authors: Chen Jiwen , Meng Decai , Zhang Rui , Yang Hongjuan , Bei Taixue , Ji Shuai 
Published: April 2022

Abstract
In order to promote the intelligent and standardized production of green light-weight wall materials in prefabricated buildings, an electrical automation control system for light-weight wall panels based on PLC technology was proposed. The process flow of the wall panel production line is analyzed, and the hardware system of the control system is determined through the selection of hardware such as motors and cylinders. The batching system, extrusion molding system, cutting system, palletizing system, transfer and maintenance system, etc. can be programmed through PLC technology. and automated production of wall panels can be accomplished by utilizing sensors and limit switches.
Direct Torque Control of Asynchronous Generator Based on Active Disturbance Rejection Controller
Authors: Li Wenhao , Liang Haiping 
Published: April 2022

Abstract
Induction generator is simple in structure and low in cost. Direct torque control is used to achieve the rapid response of induction motor electromagnetic torque and has good dynamic effect and simple control structure, but it is difficult to achieve satisfactory results considering that the method is easily affected by uncertain factors such as stator resistance parameter variation, load mutation and speed disturbance. Therefore an active disturbance rejection controller is applied to control DC voltage to reduce negative impact of unknown disturbances in the model that was built by observing and compensating the total disturbances. The results show that the scheme has the features of rapid response, robustness, and outputs dc voltage stably.
Intelligent Temperature Control System of Greenhouse Based on STM32 Single Chip Microcomputer
Authors: Wei Xinhua 
Published: April 2022

Abstract
With the development of automatic control technology and the popularization of agricultural science and technology, people are more and more aware of the intelligence convenience. In this study, a set of intelligent greenhouse temperature control system is established based on single chip microcomputer STM32F103. PID algorithm is used to realize stepless adjustment of greenhouse temperature, and complete the temperature automatic monitoring and control. It solves the greenhouse problems of low automation degree, large amount of manual work and low control accuracy of crop growth environment. The system simulation and practice show that it can improve the temperature and humidity control accuracy of greenhouse by 10.8%, and reduce the amount of manual work, and provide a good natural environment for plant growth and development, and have high economic benefits.
Simulation and analysis of sag control of microgrid inverters
Authors: Guo Jiahao , Lun Jingyi , Yang Xiong 
Published: April 2022

Abstract
A good inverter control strategy helps to maintain the stable operation of microgrid, and sag control is a common control strategy. Since the traditional sag control has the problem of difficult to stabilize the voltage frequency when switching the load. In this paper, we propose an improved sag control by introducing fuzzy control and linear self-rejecting control techniques into the voltage and current dual-loop structure of sag control, respectively, and build the simulation in Matlab/Simulink. The simulation comparison results show that the linear self-rejecting control has the best performance in stabilizing the voltage and frequency and tracking the reference value during load switching of the microgrid with better robustness than the PI control in the traditional sag control and the improved fuzzy control.
The Research on Condition Monitoring and Fault Diagnosis Method of Wind Power Spindle Bearing
Authors: Ye Lin , Lin Zhuang , Xuan Liang , Hong Wenxiong , Sun Tongjin , Yang Peijie , Yan Bowei 
Published: April 2022

Abstract
With the continuous and substantial increase in the demand for wind power generation in China, the development of wind power generation units tends to be large-scale, intelligent and efficient. Besides, the working environment of spindle bearings is relatively bad and the failure rate is relatively high. Therefore, it is necessary to conduct state monitoring and fault diagnosis for wind power generation units. This paper first introduces the bearing system of wind turbine, then expounds the common faults of wind turbine spindle bearing, and carries out relevant research. According to the fault types, this paper investigates and combs the condition monitoring and fault diagnosis methods of spindle bearing. Finally, the author proposing a new condition monitoring method, which solves the vacancy of condition monitoring method based on strain.
Effect of extrusion speed on microstructure and mechanical properties of Mg-Al-Ca-Sn alloy
Authors: Zhang Maochao , Yang Chao , Li Zhenshuai , Bao Shuai , Ye Peiran , Chen Yungui 
Published: April 2022

Abstract
Low-temperature and high-speed extrusion of wrought magnesium alloy is an urgent problem. Mg-2.5Al-2Ca-1Sn alloys were extruded at 260 °C with different ram speeds (2.0, 4.0 and 6.0 mm s)−1. The effects of extrusion speed on the microstructure and mechanical properties of the alloys were systematically investigated. It’s worth noting that all the three extruded alloys were fully dynamic recrystallized (DRXed). With the increase of extrusion speed from 2 mm s−1 to 6 mm s−1, the DRXed grain size are increased from 1.25 μm to 1.94 μm, average second phase particles are augmented from 0.79 μm to 0.89 μm and the volume fraction of second phase increases from 6.4% to 18.6%. All the three extruded samples show excellent comprehensive mechanical properties because of fine grain size, fully recrystallization and homogeneously dispersed second phase particles. The tensile yield strength (TYS) and ultimate tensile strength (UTS) decreased from 285 MPa, 304 MPa to 217 MPa, 264 MPa while the elongation increased from 11.4% to 20% when the ram speed rose from 2.0 mm s−1 to 6.0 mm s−1.
Characterizing the Spatiotemporal Heterogeneity of the COVID-19 Vaccination Landscape
Authors: Tiu Andrew , Susswein Zachary , Merritt Alexes , Bansal Shweta 
Published: April 2022

Abstract
As variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have emerged throughout 2021–2022, the need to maximize vaccination coverage across the United States to minimize severe outcomes of coronavirus disease 2019 (COVID-19) has been critical. Maximizing vaccination requires that we track vaccination patterns to measure the progress of the vaccination campaign and target locations that may be undervaccinated. To improve efforts to track and characterize COVID-19 vaccination progress in the United States, we integrated Centers for Disease Control and Prevention and state-provided vaccination data, identifying and rectifying discrepancies between these data sources. We found that COVID-19 vaccination coverage in the United States exhibits significant spatial heterogeneity at the county level, and we statistically identified spatial clusters of undervaccination, all with foci in the southern United States. We also identified vaccination progress at the county level as variable through summer 2021; the progress of vaccination in many counties stalled in June 2021, and few had recovered by July, with transmission of the SARS-CoV-2 delta variant rapidly rising. Using a comparison with a mechanistic growth model fitted to our integrated data, we classified vaccination dynamics across time at the county scale. Our findings underline the importance of curating accurate, fine-scale vaccination data and the continued need for widespread vaccination in the United States, especially with the continued emergence of highly transmissible SARS-CoV-2 variants.
Producing investment space: the International Finance Corporation and the geofinancial power network
Authors: Funke Jayson J 
Published: April 2022

AbstractThis article examines the International Finance Corporation (IFC) as an important institutional driver of the financialisation process in developing and emerging economies. An institutional analysis of the Corporation’s development objectives and corporate directives is provided, focussing on its investments, financial institution building operations and its production of new investment spaces, as exemplified in its engineering of ‘emerging markets’ as a novel financial asset class. The IFC is conceptualised as operating within the geofinancial power network, a transnational sociotechnical system that helps demonstrate how the Corporation facilitates financialisation spatially from global centres of power to peripheral spaces in developing and emerging economies.
29: INCIDENCE, DIAGNOSIS AND MANAGEMENT OF MALABSORPTION FOLLOWING OESOPHAGECTOMY: A SYSTEMATIC REVIEW
Authors: Khaw R A , Nevins E J , Phillips A W 
Published: April 2022

Abstract

Background and aim
Survival following oesophagectomy for oesophageal cancer is increasing. This has resulted in increased focus on quality-of-life and improved survivorship. Weight loss and malnutrition occurs in 25–46% of patients after three years, with associated adverse gastrointestinal symptoms. Malabsorption syndrome is multifactorial and includes exocrine pancreatic insufficiency (EPI), small intestinal bacterial overgrowth (SIBO) and bile acid malabsorption (BAM), however there is little literature available in patients following oesophagectomy. The aim of this study was to evaluate the reported incidence and management of malabsorption syndromes post-oesophagectomy.

Methods
A systematic search of PubMed, EMBASE, MEDLINE, Scopus and the Cochrane Library evaluating incidence, diagnosis and management of malabsorption was performed for studies published until March 2021.

Results
Of 461 identified studies, seven studies (6/7 non-randomised observational studies) were included, with a combined population of 344 (range 7–87). Incidence of malabsorption syndromes including EPI, SIBO and BAM were 10.2–100%, 37.8–100% and 3.33–100% respectively. There was no consensus definition for EPI, SIBO or BAM; and there was variation in diagnostic methods. Diagnostic criteria varied from clinical (gastrointestinal symptoms or weight loss), or biochemical (faecal elastase, hydrogen breath test and Selenium-75-labelled synthetic bile acid measurements). Treatment modalities using pancreatic enzyme replacement, rifaximin and colesevelam showed improvement in symptoms and weight in all studies.

Conclusion
Malabsorption syndromes following oesophagectomy are likely to be severely underestimated. The resultant gastrointestinal symptoms have a negative effect on post-operative quality of life. Current literature suggests benefit with outlined therapies, however greater understanding of these conditions, their diagnosis, and management is required to further understand which patients will benefit from treatment.
45: OUTCOMES OF PROLONGED TIME TO SURGERY IN PATIENTS WITH RESIDUAL DISEASE AFTER NEOADJUVANT CHEMORADIOTHERAPY FOR OESOPHAGEAL CANCER
Authors: Overtoom H , Eyck B , Van Der Wilk B , Noordman B , Van Der Sluis P , Wijnhoven B , Van Lanschot J , Lagarde S 
Published: April 2022

Abstract

Background and aim
Standard treatment for locally advanced oesophageal cancer is neoadjuvant chemoradiotherapy (nCRT) plus surgery. Time to surgery (TTS) after nCRT seems safe up to 12 weeks and delaying surgery may improve patient condition and pathological response. However, it is unknown whether prolonged TTS is safe in patients with residual disease. The aim of this study was to investigate whether prolonged TTS leads to inferior surgical outcomes and survival in patients with residual disease after nCRT.

Methods
Patients with pathological residual disease at endoscopy with biopsies 4–6 weeks after nCRT were selected from the preSANO-trial and SANO-trial. Patients were categorized by TTS ≤12 weeks versus TTS &gt;12 weeks after completion of nCRT. Primary endpoint was overall survival (OS). Secondary endpoints were relapse-free survival (RFS), surgery without resection (SWR), microscopically radical resection (R0), tumour regression grade (TRG) and postoperative complications. Effects of TTS on OS and RFS were analysed with Cox regression, adjusted for Charlson comorbidity index (CCI) at baseline, as well as WHO performance score and weight loss after nCRT.

Results
Forty-two patients were included in the TTS &gt;12 weeks group and 132 patients in the TTS ≤12 weeks group. Median follow-up was 20.6 months (IQR 16.1–30.3). For TTS &gt;12 weeks, the adjusted hazard ratios for all-cause mortality was 0.50 (95% CI: 0.24–1.02) and for disease-relapse or mortality was 0.47 (95% CI: 0.25–0.91). The rate of patients with a postoperative complication was higher in the TTS &gt;12 weeks group (89% vs 72%, P = 0.049), but severity of complications was comparable between the groups (Clavien-Dindo ≥3, 46% vs. 29%, P = 0.09), as were rate of SWR (12% vs. 4%, P = 0.14), R0-resections (89% vs 87%, P = 0.89), and TRG-scores (P = 0.97) compared to patients with TTS ≤12 weeks.

Conclusion
Prolonged TTS beyond 12 weeks in patients with residual disease after nCRT did not have a negative effect on OS and on RFS, but was correlated with an increase in postoperative complications.
50: IDENTIFICATION AND CLASSIFICATION OF TUMOR CELLS IN BARRETT’S CARCINOMA PATIENTS BY HYPERSPECTRAL IMAGING (HSI)
Authors: Maktabi M , Wichmann Y , Köhler H , Jansen-Winkeln B , Ahle H , Chalopin C , Thieme R 
Published: April 2022

Abstract

Background and aim
Digital pathology will revolutionize the discriminate of malignant and non-malignant cells in histologically specimens. Hyperspectral imaging (HSI), a new technology combing imaging with spectroscopy might be beneficial for tumor cell identification.

Methods
After resection, specimens (n = 95) were fixed in 4% formaldehyde and slices were conducted (3 μm), which were stained with haematoxylin and eosin (HE). Esophageal adenocarcinoma, tumor stroma, squamous epithelium cells and background were recorded by HSI between the visual and near-infrared light (500-1000 nm). A multi-layer perceptron with 2 hidden layers was used for discrimination.

Results
We were able to record esophageal adenocarcinoma, tumor stroma and squamous epithelium cells by HSI. Differences in the absorbance of squamous epithelium and esophageal adenocarcinoma cells were determined at eosin’s and hematoxilin’s maximal absorption of 524 nm and 630 nm. For all classifiers, the esophageal adenocarcinoma cells, the tumor stroma cells, the squamous epithelium and the background, the intra group variances were quite low. 412,964 spectra of EAC cells, 32,318 spectra of tumor stroma cells and 55,711 spectra of squamous epithelium cells were measured and analyzed for classification. MLP revealed an accuracy of 71% for EAC and stroma cells and 73% for squamous epithelium cells.

Conclusion
Squamous epithelium and esophageal adenocarcinoma cells show specific spectral alterations due to their HE-staining, when measured by HSI. However, the sensitivities and specificities was quiet high. For implementation in daily routine procedures, the training algorithms need to be validated to foster a semi-automatic decision-making process in histopathological tumor cell identification.
62: WHICH GASTRIC CANCER PATIENTS COULD BENEFIT FROM STAGING LAPAROSCOPY? A GIRCG MULTICENTER COHORT STUDY
Authors: Solaini L , Bencivenga M , D’Ignazio A , Milone M , Marino E , De Pascale S , Rosa F , Sacco M , Fumagalli Romario U , Graziosi L , De Palma G , Marrelli D , Morgagni P , Ercolani G 
Published: April 2022

Abstract

Background and aim
Staging laparoscopy is an important step of the staging of gastric cancer patients, however, its indication are universally accepted by the different guidelines.This study aimed to define those factors which could help in defining the most appropriate use of staging laparoscopy in a western population.

Methods
A retrospective cohort study was carried out, including 330 (226 cM- and 104 cM+) gastric cancer patients who had undergone staging laparoscopy between 2010–2020 in seven GIRCG centers. A model including easily-accessible clinical, biochemical and pathological markers was constructed to predict the risk of carcinomatosis. ROC curve and decision curve analyses were used to verify its accuracy and net benefit.

Results
In the cM- population staging laparoscopy could detect 70 cases who had peritoneal carcinomatosis or positive cytology, for a yield of 31.0%. In cM+ patients staging laparoscopy could exclude carcinomatosis in 15 cases. In cM- patients, intestinal type tumors (0.36, 0.14–0.92; P = 0.035), the presence of signet ring cells (2.58, 1.04–6.33; P = 0.039) and cancers of the upper third (3.36, 1.43–7.92; P = 0.005) were associated with the presence of peritoneal carcinomatosis and/or positive cytology. The ROC curve analysis of the model including the three variables showed an AUC of 0.75 (0.66–0.80, P &lt; 0.001). The decision curve analyses showed that the model had a higher net benefit than the treating all strategy between threshold probabilities of 16 and 50%.

Conclusion
Staging laparoscopy is a useful tool to address the patient with gastric cancer to the most adequate treatment. In cM- patients the assessment of the location of the tumor, the Lauren’s histotype and the presence of signet ring cells may help in providing additional elements in indicating or not the use of staging laparoscopy.
90: HOSPITAL VARIATION IN FAILURE TO CURE IN ESOPHAGEAL CANCER SURGERY: IS THE PROPORTION OF PATIENTS UNDERGOING SURGERY PER HOSPITAL PIVOTAL?
Authors: Voeten D M , Vissers P A , Verhoeven R H , Van Hillegersberg R , Van Berge Henegouwen M I 
Published: April 2022

Abstract

Background and aim
The proportion of potentially curable esophageal cancer patients undergoing surgery varies among hospitals. Failure to cure is a composite outcome describing surgery not meeting its aim: (1) non-resectional surgery, (2) non-radical surgery (R1/R2) or (3) postoperative mortality. This study hypothesized that hospitals offering surgery to many patients have higher failure-to-cure rates. It aimed to investigate the relationship between the proportion of potentially curable esophageal cancer patients undergoing surgery and failure-to-cure rates.

Methods
From the Netherlands Cancer Registry, all patients with cT1-cT4a/cTx-any cN-cM0 esophageal cancer diagnosed in 2015–2018 were included. For each region surrounding a surgical center, the expected proportion of patients undergoing surgery was established using multivariable analyses and divided by the observed proportion computing the O/E ratio. Hospitals were categorized into tertiles based on their tendency to treat patients surgically (O/E ratio). The association between these hospital groups and failure to cure was investigated using multilevel multivariable regression analyses.

Results
In total, 3,437 (53.2%) of 6,457 potentially curable patients underwent surgery, ranging from 45–64% among 16 hospitals. The overall failure-to-cure rate was 15.0% (hospital variation [4.6%–23.7%]). After categorizing, 1,003 patients underwent surgery in hospitals treating relatively few patients surgically (O/E ratio &lt; 0.94), 1,297 patients in average hospitals and 1,137 patients in hospitals treating many patients surgically (O/E ratio &gt; 1.01). Failure-to-cure rates were 16.8%, 12.2% and 14.0%, respectively. This was non-significant in multilevel analyses (aOR:0.63, 95%CI:0.38–1.05; aOR:0.76, 95%CI:0.46–1.24) (Table 1).

Conclusion
Failure-to-cure rates were not significantly higher in hospitals with a high percentage of surgery, suggesting that increasing the surgery rate may be beneficial.

Table
http://uploadfile.sem-2000.it/OLC/file/9203828791100911681076702/93673_Table.JPG.
96: EXPERIENCE IN RECONSTRUCTION OF LARYNGOPHARYNGOESOPHAGECTOMIES IN A THIRD LEVEL CENTER
Authors: Navío-Seller A , Abelló-Audí D , Bruna-Esteban M , Vaqué-Urbaneja J , Mingol-Navarro F 
Published: April 2022

Abstract

Background and aim
Pharyngoesophageal reconstruction after laryngo-pharyngo-esophagectomy is challenging due to its high morbidity and mortality. There are different reconstructive flaps: visceral flaps (pedicle stomach and colon flaps and free jejunum or colon grafts) and myocutaneous flaps (pedicle local flaps or free grafts). The objective is to evaluate the morbidity and mortality and functional results of the reconstruction after laryngo-pharyngo-esophagectomy.

Methods
This is a retrospective study of patients who underwent laryngo-pharyngo-esophagectomy in our center, due to a benign cause (caustic ingestion) or malignant (larynx, pharynx, parathyroid and cervical esophagus cancer) with circumferential pharyngeal reconstruction with flap, from 2008 to 2020. Demographic variables, procedure performed and flap used for reconstruction, complications related to reconstruction (fistula, stenosis, necrosis), postoperative complications, days until adequate swallowing, flap’s functional result, hospital stay, recurrence and mortality were collected.

Results
Twelve patients, with 59 years (45–78) median age, underwent surgery. There were complications related to reconstruction in 42% of the patients (Table 1). Postoperative morbidity was 67%. The median hospital stay was 21 days (16–94). The median time to swallowing was 13 days (3–73). An optimal functional result (oral intake) was achieved in 75%. The median follow-up was 18 months (4–56), with a survival rate of 50%. 30-days mortality was 8%.

Conclusion
Our study shows a high morbidity and mortality after circumferential pharyngeal reconstruction, similar to literature published. We have observed a higher rate of reconstruction related complications and worse functional results in reconstructions performed with gastroplasty and coloplasty after total laryngo-pharyngo-esophagectomy, compared to less aggressive local resections with ALT free flap reconstruction.

Table
https://secure.sem-2000.it/semUpload/OLC/file/9203828791100911681076702/93727_Table.jpg.