Redesigned rotor for a highly loaded, 1800 ft/sec tip speed compressor fan stage 1: Aerodynamic and mechanical design

A highly loaded, high tip-speed fan rotor was designed with multiple-circular-arc airfoil sections as a replacement for a marginally successful rotor which had precompression airfoil sections. The substitution of airfoil sections was the only aerodynamic change. Structural design of the redesigned rotor blade was guided by successful experience with the original blade. Calculated stress levels and stability parameters for the redesigned rotor are within limits demonstrated in tests of the original rotor

Energy efficient engine low-pressure compressor component test hardware detailed design report

The aerodynamic and mechanical design description of the low pressure compressor component of the Energy Efficient Engine were used. The component was designed to meet the requirements of the Flight Propulsion System while maintaining a low cost approach in providing a low pressure compressor design for the Integrated Core/Low Spool test required in the Energy Efficient Engine Program. The resulting low pressure compressor component design meets or exceeds all design goals with the exception of surge margin. In addition, the expense of hardware fabrication for the Integrated Core/Low Spool test has been minimized through the use of existing minor part hardware

Energy efficient engine fan component detailed design report

The fan component which was designed for the energy efficient engine is an advanced high performance, single stage system and is based on technology advancements in aerodynamics and structure mechanics. Two fan components were designed, both meeting the integrated core/low spool engine efficiency goal of 84.5%. The primary configuration, envisioned for a future flight propulsion system, features a shroudless, hollow blade and offers a predicted efficiency of 87.3%. A more conventional blade was designed, as a back up, for the integrated core/low spool demonstrator engine. The alternate blade configuration has a predicted efficiency of 86.3% for the future flight propulsion system. Both fan configurations meet goals established for efficiency surge margin, structural integrity and durability

Risk Factors of Delivery by Caesarean Section in Cameroon (2003-2004): A Regional Hospital Report

We conducted this retrospective case-control study to identify possible risk factors of delivery through caesarean section in the Far North Region of Cameroon. Data was collected retrospectively from delivery room registers at the Provincial Hospital, Maroua, Cameroon from 01/01/2003 to 31/12/2004. The overall 125 eligible caesarean deliveries were compared with 244 women who delivered vaginally during the study period. The odds ratio as well as the 95% confidence interval was used to measure the relationship between maternal characteristic and risk of delivery by caesarean section. We found that the marital status is similar in the two study populations. Risk factors associated with cesarean section were: maternal age less than 17 years (OR 3.55, 95%CI: 1.46–8.64), maternal age over 39 years (OR 3.55, 95% CI: 1.17–10.75), nulliparity (OR 2.72, 95% CI: 1.59–4.66), grand multiparty (OR 3.43, 95% CI: 1.79–6.57), and macrosomia (OR 4.82, 95% CI: 1.49–16.44). There was a weak association with absent or poor. Caesarean delivery is associated with extreme ages of reproductive life, macrosomia, nulliparous and grand multiparous status. We strongly recommend that these factors be taken into consideration to strengthen the mother and child health programs in Cameroon and countries with similar socioeconomic profiles

Does Twitter User Activity Promote Gambling-Related Content?

Social media has provided gambling operators with access to millions of individuals and novel ways to promote gambling. Research has suggested that exposure to gambling advertisements on social media platforms is associated with increased gambling in individuals at-risk for problem gambling. These findings bring into question whether social media platforms are sensitive to differences in user account activity (e.g., tweets, likes, accounts visited) when displaying advertisements and gambling-related content. To assess for these differences, four Twitter accounts were created and assigned to send out tweets containing pro-wagering versus safe-wagering-related messages. Additionally, one of each account was assigned to interact with Twitter profiles associated with gambling operators or responsible gambling. Accounts were assessed daily for advertisement traffic and gambling-related content from January to March 2022. The study included three phases that implemented changes in privacy settings, websites visited, and gambling-related tweets observed. To assess for between-phase differences, Tau-U analyses were performed using R. No gambling advertisements were observed throughout the study. Nongambling advertisements remained constant across all accounts. Gambling-related content observed depended on assigned account activity. Accounts that interacted with gambling operators’ profiles were only displayed pro-wagering-related content. Conversely, accounts that interacted with responsible gambling profiles were only displayed safe-wagering-related content. Findings suggest that Twitter is sensitive to differences in account activity. Social media platforms’ ethical obligations have been a topic of concern. However, it seems that the type of gambling-related content displayed on Twitter largely depends on the user’s activity, thus, placing responsibility for what is displayed on the user

Geographic Distribution of Childbirth among Adolescents in Cameroon from 2003 to 2005

Objective. To determine the frequency and the trend of adolescents (10–19 years) in childbirth within a period of 3 years in referral maternity units in Cameroon. Method. Descriptive and retrospective study for a 3-year period (2003–2005) in referral maternity units headed by a qualified Obstetrician-Gynecologist. We analyzed the trend and geographic distribution of 8222 adolescent deliveries over 3 years. Epi Info 3.5 software was used for data analysis. Chi square test for trend was used to assess the contribution of adolescent deliveries over years. The trend was considered significant if P < .05. Results. During the period of the study, there was a total of 8387 deliveries. We excluded 165 women because of lack of information about age. We therefore included a total of 8222 adolescent deliveries. Overall, the contribution of adolescents to deliveries ranged from 6.87% to 26.51%, depending on the region with a national mean of 14.23%. Adolescents aged 16 or less contributed to 2.82% of deliveries while those aged from 17 to 19 contributed to 11.41%. The contribution of adolescents to deliveries decreased significantly over 3 years (P < .0001). Conclusion. The study underscores the importance of Public Health programs in strengthening maternity services for adolescents in Cameroon while taking into consideration geographic differences

The new onset of dysphagia four years after anterior cervical discectomy and fusion: Case report and literature review.

Background: Dysphagia is a common complication immediately following anterior cervical spine surgery. However, its onset more than 1-year postoperatively is rare. Case Description: A 45-year-old male initially underwent a C3-4 and C5-6 anterior cervical discectomy and fusion (ACDF). At age 49, 4 years later, he presented with worsening dysphagia accompanied by neck and right upper extremity pain. Radiographs demonstrated an extruded left C3 screw, which had migrated into the prevertebral soft tissues at the C4-C5 level; there was also loosening of the right C3 screw. The subsequent barium swallow study revealed that the screw was embedded in the pharyngeal wall. The patient required a two-stage operation; first, to remove the anterior instrumentation, and second, to perform a posterior instrumented C2-T2 fusion. Conclusion: A barium swallow study and other dynamic imaging are a valuable component of the diagnostic workup and therapeutic intervention to evaluate the delayed onset dysphagia following an ACDF

A preoperative predictive tool to assess the need for staging laparoscopy in oesophagogastric cancer patients

INTRODUCTION: Staging laparoscopy (SL) has become commonplace in the preoperative staging pathway for oesophagogastric (OG) cancer. SL is often performed before curative treatment to examine for macroscopic peritoneal metastases (PM) or positive peritoneal cytology (PPC). The aim of this study was to develop an objective risk scoring system to predict both PM and PPC at SL.METHODS: A prospectively collected and maintained database of all OG cancer patients treated between 2006 and 2020 was reviewed. Univariate and multivariate analyses were performed to identify risk factors for both PM and PPC at SL. A risk score was produced for both PM and PPC, and then validated internally.RESULTS: Among 968 patients who underwent SL, 96 (9.9%) had PM and 81 (8.4%) had PPC at SL. Tumour site ( p &lt; 0.001), computed tomography (CT) T stage ( p &lt; 0.001) and N stage ( p = 0.029) were significantly associated with PM at SL ( p &lt; 0.001). Tumour site ( p &lt; 0.001), biopsy histology ( p = 0.041), CT T stage ( p &lt; 0.001) and N stage ( p &lt; 0.001) were significantly associated with PPC. The risk scoring model for PM included cancer site and CT T stage. This was successfully tested on the validation set (area under the receiver operating characteristic [AUROC] = 0.730). The risk scoring model for PPC included cancer site, CT T and N stage. This was successfully tested on the validation set (AUROC = 0.773). CONCLUSIONS: The current risk scores are valid tools with which to predict the risk PM and PPC in patients undergoing SL for OG cancer and may help to avoid subjecting patients to unnecessary SL.</p