Investigating electrochemical corrosion at Mg alloy-steel joint interface using scanning electrochemical cell impedance microscopy (SECCIM).

Developing strategies to prevent corrosion at the interface of dissimilar metal alloys is challenging because of the presence of heterogenous distribution of galvanic couples and microstructural features that significantly change the corrosion rate. Devising strategies to mitigate this interfacial corrosion requires quantitative and correlative understanding of its surface electrochemical reaction. In this work, scanning electrochemical cell impedance microscopy (SECCIM) was employed to study location-specific corrosion in the interfacial region of dissimilar alloys, such as AZ31 (magnesium alloy) and DP590 (steel) welded using the Friction-stir Assisted Scribe Technique (FAST) processes.

Roles of HNO and Carboxylic Acids in the Thermal Stability of Nitroplasticizer.

In the thermal aging of nitroplasticizer (NP), the produced nitrous acid (HONO) can decompose into reactive nitro-oxide species and nitric acid (HNO). These volatile species are prone to cause cascaded deterioration of NP and give rise to various acidic constituents. To gain insight on the early stage of NP degradation, an adequate method for measuring changes in the concentrations of HONO, HNO, and related acidic species is imperative.

High-pressure apparatus for monitoring solid-liquid phase transitions.

This work presents a new technique for evaluating the solid-liquid phase transformations in complex diesel fuel blends and diesel surrogates under high-pressure conditions intended to simulate those occurring in vehicle fuel injectors. A high-pressure apparatus based on a visual identification of freezing and thawing has been designed and built to monitor phase behavior and determine the crystallization temperature of complex fuels to predict wax precipitation. The proposed methodology was validated using pure substances-n-hexadecane (CH), cyclohexane (CH), and a mixture of 0.

Field experiments of surface water to groundwater recharge to characterize the mobility of uranium and vanadium at a former mill tailing site.

Characterizing the mobility of uranium and vanadium in groundwater with a hydraulic connection to surface water is important to inform the best management practices of former mill tailing sites. In this study, the recharge of river water to the unsaturated and saturated zones of a uranium-contaminated alluvial aquifer was simulated in a series of forced-gradient single- and multi-well injection-extraction tests. The injection fluid (river water) was traced with natural and artificial tracers that included halides, fluorobenzoates, lithium, and naphthalene sulfonate to characterize the potential mass transport mechanisms of uranium and vanadium.

Use of Multimodal Interventional Radiology with an Intracerebral Artery Stent Retriever for Acute Superior Mesenteric Artery Thrombosis: A Case Report.

Acute superior mesenteric artery thrombosis is usually fatal; however, early intravascular treatment using a mechanical thrombectomy device can be an effective intervention. A 70-year-old man with atrial fibrillation presented with sudden abdominal pain; superior mesenteric artery thrombosis was confirmed using contrast-enhanced computed tomography. Thrombolysis, mechanical fragmentation, aspiration, and thrombectomy were successfully performed using the Trevo® XP ProVue stent retriever via a brachial approach, and intestinal necrosis was avoided.