Quantifying measures to limit wind driven resuspension of sediments for improvement of the ecological quality in some shallow Dutch lakes

Although phosphorus loadings are considered the main pressure for most shallow lakes, wind-driven resuspension can cause additional problems for these aquatic ecosystems. We quantified the potential effectiveness of measures to reduce the contribution of resuspended sediments, resulting from wind action, to the overall light attenuation for three comparable shallow peat lakes with poor ecological status in the Netherlands: Loosdrecht, Nieuwkoop, and Reeuwijk (1.8–2.7 m depth, 1.6–2.5 km fetch). These measures are: 1. wave reducing barriers, 2. water level fluctuations, 3. capping of the sediment with sand, and 4. combinations of above. Critical shear stress of the sediments for resuspension (Vcrit), size distribution, and optical properties of the suspended material were quantified in the field (June 2009) and laboratory. Water quality monitoring data (2002–2009) showed that light attenuation by organic suspended matter in all lakes is high. Spatial modeling of the impact of these measures showed that in Lake Loosdrecht limiting wave action can have significant effects (reductions from 6% exceedance to 2% exceedance of Vcrit), whereas in Lake Nieuwkoop and Lake Reeuwijk this is less effective. The depth distribution and shape of Lake Nieuwkoop and Lake Reeuwijk limit the role of wind-driven resuspension in the total suspended matter concentration. Although the lakes are similar in general appearance (origin, size, and depth range) measures suitable to improve their ecological status differ. This calls for care when defining the programme of measures to improve the ecological status of a specific lake based on experience from other lakes.

Interfaces Per Module : Is There An Ideal Number?

Identifying an appropriate level of abstraction for a technical system is a task often left to more experienced product designers. Based on a systematic approach to modular product design, experience has shown that module interfaces are a key factor in identifying this appropriate level. The foundation for this research is that there are an ideal number of interfaces that corresponds to three semiotic, or signed, notational levels of product design communication. This report will present an empirical metric that represents this ideal number, which can be used to assess the quality of the decomposition based on the number of interface types. The conclusion of the report is that the empirical value very closely matches the semiotic theory of three interfaces per module.QC 20121207</p

The artificial urinary sphincter and male sling for postprostatectomy incontinence: Which patient should get which procedure?

Surgery is the most efficacious treatment for postprostatectomy incontinence. The ideal surgical approach depends on a variety of patient factors including history of prior incontinence surgery or radiation treatment, bladder contractility, severity of leakage, and patient expectations. Most patients choose to avoid a mechanical device, opting for the male sling over the artificial urinary sphincter. The modern male sling has continued to evolve with respect to device design and surgical technique. Various types of slings address sphincteric incompetence via different mechanisms of action. The recommended surgery, however, must be individualized to the patient based on degree of incontinence, detrusor contractility, and urethral compliance. A thorough urodynamic evaluation is indicated for the majority of patients, and the recommendation for an artificial urinary sphincter, a transobturator sling, or a quadratic sling will depend on urodynamic findings and the patient’s particular preference. As advancements in this field evolve, and our understanding of the pathophysiology of incontinence and mechanisms of various devices improves, we expect to see continued evolution in device design

Utilization and Cost of Gender-affirming Surgery in the United States from 2012-2019.

OBJECTIVE: To characterize the trends in and characteristics associated with the utilization and cost of gender-affirming surgery (GAS) in the United States from 2012-2019. SUMMARY BACKGROUND DATA: GAS is one option among gender-diverse (GD) people to transition from their biologic anatomy to the anatomy congruent with their gender. Little is known about its utilization and cost trends and whether patient and hospital characteristics are associated with differences in utilization and cost. METHODS: This serial cross-sectional study collected retrospective data from the Healthcare Cost and Utilization Project (HCUP) National Inpatient Sample (NIS), a representative pool of inpatient visits in the United States. Records from 2012-2019 that indicated ages 18 or older, GD diagnoses, and GAS procedures were identified using the International Classification of Diseases, Ninth and Tenth Revisions. Within this cohort, demographics, utilization, and cost were collected and analyzed using descriptive statistics and multivariable regression models. RESULTS: 6,325 records with GD diagnoses and GAS procedures were identified. From 2012-2019, utilization increased by more than 5-fold (0.9 to 5.0 per 100,000 records among all records), and the mean, inflation-adjusted cost increased by 36% ($19,451 to$26,517). This cost trend was similar by type of surgery, and genital surgery had consistently higher costs than chest surgery from 2012 to 2019 (genital: $21,487 to$26,712, chest: $13,238 to$21,309). Lower odds of utilization were found in records with Medicaid (OR = 0.27, 95% CI [0.22-0.35], P CONCLUSIONS: As demand for GAS increases with varying utilization and costs based on patient and hospital characteristics, there will likely be a need for more qualified surgeons, increased insurance coverage, and policies to ensure equitable access to GAS