A wearable microwave instrument can detect and monitor traumatic abdominal injuries in a porcine model

Abdominal injury is a frequent cause of death for trauma patients, and early recognition is essential to limit fatalities. There is a need for a wearable sensor system for prehospital settings that can detect and monitor bleeding in the abdomen (hemoperitoneum). This study evaluates the potential for microwave technology to fill that gap. A simple prototype of a wearable microwave sensor was constructed using eight antennas. A realistic porcine model of hemoperitoneum was developed using anesthetized pigs. Ten animals were measured at healthy state and at two sizes of bleeding. Statistical tests and a machine learning method were used to evaluate blood detection sensitivity. All subjects presented similar changes due to accumulation of blood, which dampened the microwave signal ($$p < 0.05$$ p < 0.05 ). The machine learning analysis yielded an area under the receiver operating characteristic (ROC) curve (AUC) of 0.93, showing 100% sensitivity at 90% specificity. Large inter-individual variability of the healthy state signal complicated differentiation of bleedings from healthy state. A wearable microwave instrument has potential for accurate detection and monitoring of hemoperitoneum, with automated analysis making the instrument easy-to-use. Future hardware development is necessary to suppress measurement system variability and enable detection of smaller bleedings.

Centennial to millennial variability of greenhouse climate across the mid-Cenomanian event

Centennial- to millennial-scale climate variations are often attributed to solar forcing or internal climate system variability, but recognition of such variations in the deep-time paleoclimate record is extremely rare. We present an exceptionally well-preserved, millimeter-scale laminated marlstone from a succession of precession-driven limestone-marlstone couplets deposited in the Western Interior Seaway (North America) immediately preceding and during the Cretaceous mid-Cenomanian event (ca. 96.5 Ma). Sedimentological, geochemical, and micropaleontological data indicate that individual pairs of light-dark laminae record alternations in the extent of water-column mixing and oxygenation. Principal component analysis of X-ray fluorescence element counts and a grayscale scan of a continuous thin section through the marlstone reveal variations with 80–100 yr, 200–230 yr, 350–500 yr, ~1650 yr, and 4843 yr periodicities. A substantial fraction of the data indicates an anoxic bottom water variation with a pronounced 10,784 yr cycle. The centennial to millennial variations are reminiscent of those found in Holocene total solar irradiance variability, and the 10,784 yr anoxia cycle may be a manifestation of semi-precession-influenced Tethyan oxygen minimum zone waters entering the seaway.

Intra-System Reliability Assessment of 2-Dimensional Shear Wave Elastography

The availability of 2-Dimensional Shear Wave Elastography (2D-SWE) technology on modern medical ultrasound systems is becoming increasingly common. The technology is now being used to investigate a range of soft tissues and related pathological conditions. This work investigated the reliability of a single commercial 2D-SWE system using a tissue-mimicking elastography phantom to understand the major causes of intra-system variability. Sources of shear wave velocity (SWV) measurement variability relates to imaging depth, target stiffness, sampling technique and the operator. Higher SWV measurement variability was evident with increasing depth and stiffness of the phantom targets. The influence of the operator was minimal, and variations in sampling technique had little impact on the SWV.

Variations in stability revealed by temporal asymmetries in contraction of phase space flow

Empirical diagnosis of stability has received considerable attention, often focused on variance metrics for early warning signals of abrupt system change or delicate techniques measuring Lyapunov spectra. The theoretical foundation for the popular early warning signal approach has been limited to relatively simple system changes such as bifurcating fixed points where variability is extrinsic to the steady state. We offer a novel measurement of stability that applies in wide ranging systems that contain variability in both internal steady state dynamics and in response to external perturbations. Utilizing connections between stability, dissipation, and phase space flow, we show that stability correlates with temporal asymmetry in a measure of phase space flow contraction. Our method is general as it reveals stability variation independent of assumptions about the nature of system variability or attractor shape. After showing efficacy in a variety of model systems, we apply our technique for measuring stability to monthly returns of the S&P 500 index in the time periods surrounding the global stock market crash of October 1987. Market stability is shown to be higher in the several years preceding and subsequent to the 1987 market crash. We anticipate our technique will have wide applicability in climate, ecological, financial, and social systems where stability is a pressing concern.

Revealing system variability in offshore service operations through systemic hazard analysis

As wind farms are moving farther offshore, logistical concepts increasingly include service operation vessels (SOVs) as the prime means of service delivery. However, given the complexity of SOV operations in hostile environments, their safety management is challenging. The objective of this paper is to propose a quantitative, non-probabilistic metric for the preliminary comparison of SOV operational phases. The metric is used as a conditional proxy for the incident likelihood, conditioned upon the presence of similar resources (manpower, time, skills, knowledge, information, etc.) for risk management across compared operational phases. The comparison shows that the three considered phases of SOV operation have rather comparable levels of variability, hence the likelihood for incidents. However, the interface between the SOV and turbine via the gangway system and the manoeuvring between turbines seem to show a higher potential for incidents and performance (work efficiency) shortfalls.

Lithuanian Slang Adverbs of Slavic Origin

The article morphologically analyzes Lithuanian slang adverbs (215) of Slavic origin (mostly from Russian, sometimes from Polish and Belarusian), selected from Dictionary of Lithuanian Slang and Nonnormative Lexicon. There are four types of adverbs selected for analysis: hybrid derivatives of the suffix -ai from suffixal and nonsuffixal adjectives, adverbs without formants, and adverbialized word combinations. The aim of the analysis is to identify systematic morphological patterns and adaptive features. The analysis has shown that in Lithuanian slang Slavic adverbs are adapted phonetically and orthographically according to the principle of substitution of foreign phonemes as close as possible to their own. The Slavic slang lexicon tends to copy derivative models and integrate them into and inflectional paradigms of Lithuanian: morphological features are inherited from Slavic languages and specifically transformed in the Lithuanian language system; variability in borrowed slang appears due to spontaneous adaptation to language recipient features.

FINANCIAL SECURITY OF THE REGION: SCIENTIFIC APPROACHES TO THE IDENTIFICATION OF THE CONCEPT

Ensuring financial security at all levels of government is an important task for many countries, including Ukraine. It is impossible to solve the economic problems facing the country, region and enterprise without providing them with financial security. This task is becoming a particular priority in the face of instability and financial crisis. The purpose of the article is to generalize the theoretical provisions on the essence of financial security of the regions, to identify its main components and areas of support. The article presents the interpretation of the concept of the region in the framework of different approaches of scientists. The most important blocks of the structure of economic security of the region are revealed: financial independence, stability and stability of the regional economy, ability to self-development and progress. The main approaches to the essence of the concept of “financial security” are systematized, the essence of the concept of “financial security system of the region” is considered. The principles of economic security of the region are given: general, namely: complexity, system, variability (alternatives), the principle of coordination (coordination) of relations and relations of all elements of economic security of the region, the principle of specialization elements (separation of functions and operations performed by elements). Based on the obtained results, the directions of strengthening the financial security of the region are proposed. In the current conditions of economic development of Ukraine, first of all it is necessary to move in the direction of improving the system of financial security, namely: establishing the boundaries of foreign participation in the capital of domestic organizations; introduce industry restrictions; development of effective control systems for attracting and using foreign borrowings. We believe that the country’s financial security system should ensure the solution of the following tasks: creating a full-fledged national currency and maintaining it in a stable and competitive state; saturation of the economy and the market with money supply in the amount necessary for their full functioning and development; creation of conditions provide intensive formation of competitive national financial capital denominated in national currency; ensuring financial parity with Ukraine’s main competitors in the medium term.