Weinsteinthorpe0678

Thus, a combination of low hydraulic conductivities and assumed flowing porosities resulted in underestimated flow velocities. The UK karst aquifers are characterized by a range of hydraulic behaviours that fit those of karst aquifers worldwide. Indeed, underestimation of flow velocity due to inappropriate parameter selection is common to intensively karstified aquifers of southern France, north-western Germany and Italy. Similar issues arise for the Canadian Silurian carbonates where the use of high effective porosities (e.g. 5%) in transport models leads to underestimation of groundwater velocities. We recommend values in the range of 0.01-1% for such aquifers.Urban drainage pipeline systems collect and transport domestic sewage, industrial wastewater, and rainwater. They are important components of urban infrastructure. The quality of drainage facilities directly determines the level of urban development and affects the urban landscape and sanitary environment. In recent years, however, the phenomenon of "attaching importance to construction, despising management and maintenance" has prevailed in China's urban drainage pipeline network. The problems such as structural damage, corrosion, and blockage of the sewage pipelines are becoming increasingly prominent in China, causing a lot of operational challenges such as direct discharge of sewage, backward irrigation of river and lake water, infiltration of external water, and overflow pollution. To comprehensively acquire these information about China's urban drainage pipeline network, this paper reviews current status of construction, operation, management and maintenance, existent problems, and coping strategy of the sewage pipelines. Finally, future directions are also discussed in detail for rational construction and maintenance of sewage pipelines.As a consequence of industrial mining activity, high volumes of tailings are scattered around Mexico. Frequently, tailings contain heavy metals (HM) which entail threats against all organisms. The aim of this research was to identify plants and root fungal endophytes in polymetallic polluted tailings with the potential to be used in strategies of bioremediation. Four deposits of mine wastes, situated in a semi-arid region near urban and semi-urban populations, and agricultural areas, were studied. The physical and chemical characteristics of substrates, accumulation of HM in plant tissues, root colonization between arbuscular mycorrizal (AMF) and dark septate endophyte (DSE) fungi, and the identification of DSE fungi isolated from the roots of two plant species were studied. Substrates from all four sites exhibited extreme conditions high levels in sand; low water retention; poor levels in available phosphorus and nitrogen content; and potentially toxic levels of lead (Pb), cadmium (Cd), and zinc (Zn). The nan populations, and agricultural areas.Environmental and ecological issues have led to the development of new sustainable channels for the recovery of dredged sediments. One of the major difficulties of sediment valorization lies in particular in its very heterogeneous composition. For example, the presences of heavy metals and organic matter have a significant influence on the environmental impact of materials formulated with sediment. Some heavy metals such as antimony, mercury, lead, and cadmium in high concentrations are dangerous to the body. Trace metals trapped in sediments are transformed through complex biogeochemical processes. They subsequently associate with organic matter to form clay-humic groups that define the degree of sediment pollution. The Harbour Dredging Sediments (HDSs) used were classified as non-hazardous waste in accordance with Directive 12/12/14/EC. The purpose of this study is to evaluate the environmental impact of the use of HDS from active lagoon in the formulation of self-compacting concrete (SCC) with the objectivsified as inert, clinker hydration produces hydrates that capture and stabilize heavy metals in the cementitious matrix. The results obtained show that HDSs could be used as a secondary raw material in the formulation of self-compacting concretes.

The aims of the present study were to compare the biomechanical properties of tibial fixation in hamstring-graft ACL reconstruction using interference screw and a novel combination interference screw and dowel construct.

We compared the fixation of 30 (2- and 4-stranded gracilis and semitendinosis tendons) in 15 fresh-frozen porcine tibiae with a biocomposite resorbable interference screw (Group 1) and a screw and dowel construct (Group 2). Each graft was subjected to load-to-failure testing (50mm/min) to determine maximum load, displacement at failure and pullout strength.

There were no significant differences between the biomechanical properties of the constructs. Multivariate analysis demonstrated that combination constructs (β = 140.20, p = 0.043), screw diameter (β = 185, p = 0.006) and 4-strand grafts (β = 51, p = 0.050) were associated with a significant increase in load at failure. Larger screw diameter was associated with increased construct stiffness (β = 20.15, p = 0.020).

The screw and dowel construct led to significantly increased fixation properties compared to interference screws alone in a porcine model. Increased screw diameter and utilization of 4-strand ACL grafts also led to improvement in load-to-failure of the construct. However, this is an in vitro study and additional investigations are needed to determine whether the results are reproducible in vivo.

Level V; Biomechanical study.

Level V; Biomechanical study.

We explored adolescent and young adult cancer survivor (AYA) experiences with COVID-19 to understand the impact of living through a pandemic, unmet needs, and coping strategies.

AYAs were recruited nationally, completed an online survey, and attended one of six online focus groups. We used qualitative content analysis to analyze focus group data.

Thirty-nine AYAs completed the survey, and 24 also participated in the focus groups. In the survey, AYAs responded that COVID-19 increased anxiety about their health or their family's health, feelings of isolation, and worries about job security. selleckchem Overarching focus group themes included AYA behavioral responses to the pandemic similar to their peers, the added burden of cancer, and unexpected advantages of a cancer history. When discussing the added burden of cancer, subthemes included difficulties and delays in medical care, mental health stressors, and compounding uncertainty. Unexpected advantages of a cancer history included relying on coping strategies developed during active treatment and resiliency from practicing social distancing during treatment.