A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

The diagnostics of constructions built with steel fibre reinforced concrete are extremely difficult to conduct because, typically, no information on the actual amount and orientation of the fibres is available. Therefore, it is of great interest to engineers to have the possibility to determine the steel fibre content and, at best, also the orientation of the fibres in existing structures. For this purpose, an easy-to-use test setup was developed and tested, in the course of laboratory investigations. This method can be used for cylinders, for example drilling cores, that can later be taken of existing structures, to determine both the fibre content and orientation. Based on these results, a model for cylindrical specimens was derived, which can be used for varying concrete compositions with steel fibre contents of up to 80 kg/m3. In the case of missing information concerning the concrete composition, it allows an initial estimation for the fibre content. In case additional information about the concrete composition is available, a much higher accuracy of the projected steel fibre content and therefore, an assessment of the building’s condition is possible.

A Novel Bimodal Forecasting Model for Solar Cycle 25

In this paper, a novel bimodal model to predict a complete sunspot cycle based on comprehensive precursor information is proposed. We compare the traditional 13 month moving average with the Gaussian filter and find that the latter has less missing information and can better describe the overall trend of the raw data. Unlike the previous models that usually only use one precursor, here we combine the implicit and geometric information of the solar cycle (peak and skewness of the previous cycle and start value of the predicted cycle) with the traditional precursor method based on the geomagnetic index and adopt a multivariate linear approach with a higher goodness of fit (>0.85) in the fitting. Verifications for cycles 22–24 demonstrate that the model has good performance in predicting the peak and peak occurrence time. It also successfully predicts the complete bimodal structure for cycle 22 and cycle 24, showing a certain ability to predict whether the next solar cycle is unimodal or bimodal. It shows that cycle 25 is a single-peak structure and that the peak will come in 2024 October with a peak of 145.3.

Domain-Specific Multi-Level IR Rewriting for GPU

Most compilers have a single core intermediate representation (IR) (e.g., LLVM) sometimes complemented with vaguely defined IR-like data structures. This IR is commonly low-level and close to machine instructions. As a result, optimizations relying on domain-specific information are either not possible or require complex analysis to recover the missing information. In contrast, multi-level rewriting instantiates a hierarchy of dialects (IRs), lowers programs level-by-level, and performs code transformations at the most suitable level. We demonstrate the effectiveness of this approach for the weather and climate domain. In particular, we develop a prototype compiler and design stencil- and GPU-specific dialects based on a set of newly introduced design principles. We find that two domain-specific optimizations (500 lines of code) realized on top of LLVM’s extensible MLIR compiler infrastructure suffice to outperform state-of-the-art solutions. In essence, multi-level rewriting promises to herald the age of specialized compilers composed from domain- and target-specific dialects implemented on top of a shared infrastructure.

Wireline logs vs drilling events: Which one to believe in implying subsurface pressure?

As generally known, subsurface pressure can be implied using both wireline logs and drilling events. However, there may be a case where wireline logs and drilling events do not indicate the same subsurface pressure. Data from four vertical wells located in the South Sumatra Basin, Indonesia, were analyzed as a case study. Two wells, Wells A and D, encountered high overpressured zones, confirmed by drilling events and wireline logs data. The two others, Wells B and C, only encountered low overpressured zones, inferred by the relatively low mudweight used during the drilling. However, the wireline logs of Wells B and C show a reversal as Wells A and D. There are two hypotheses to explain the condition in Wells B and C. First, the wireline logs reversal is due to shallow carbonate cementation. Second, Wells B and C were drilled in an unintentional underbalanced condition. The method used includes XRD, SEM, and titration analysis. The results show that the first hypothesis is false, while the second is true. It may be due to some missing information related to drilling events in the final well report of Wells B and C.

Corrigendum: Description of Kavayva, gen. nov., (Chalcidoidea, Eurytomidae) and two new species associated with Guarea (Meliaceae), and a review of New World eurytomids associated with seeds. Journal of Hymenoptera Research 86: 101–121. https://doi.org/10.3897/jhr.86.71309

In a paper about the description of Kavayva, a new genus of Eurytomidae (Zhang et al. 2021) The indication of repository for the type specimens were missing. We regret this omission, and provide the missing information below. MUSM – Natural History Museum of the San Marcos University, Lima, Peru UFGD – Museum of Biodiversity of the Federal University of Grande Dourados, Dourados-MS, Brazil USNM – United States National Museum of Natural History, Washington, D.C., USA. Kavayva bodoquenensis Zhang, Silvestre, & Gates, sp. nov. Holotype female deposited at USNM. Paratypes deposited at USNM [12F, 13M] and UFGD [8F, 3M]. Kavayva davidsmithi Zhang & Gates, sp. nov. Holotype female deposited at MUSM. Paratypes deposited at USNM [1F, 1M].

ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH

Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source of accident data, but conventional analyses of the database yield limited insights to LOC-I. We investigate the causes of 5,726 LOC-I fixed‑wing GA aircraft accidents in the United States in 1999–2008 and 2009–2017 using a state-based modeling approach. The multi-year analysis helps discern changes in causation trends over the last two decades. Our analysis highlights LOC-I causes such as pilot actions and mechanical issues that were not discernible in previous research efforts. The logic rules in the state-based approach help infer missing information from the National Transportation Safety Board (NTSB) accident reports. We inferred that 4.84% (1999–2008) and 7.46% (2009–2017) of LOC-I accidents involved a preflight hazardous aircraft condition. We also inferred that 20.11% (1999–2008) and 19.59% (2009–2017) of LOC-I accidents happened because the aircraft hit an object or terrain. By removing redundant coding and identifying when codes are missing, the state-based approach potentially provides a more consistent way of coding accidents compared to the current coding system.

Listen With Your Wrists

Most of us have five senses that our brains use to create a model of the world us. We see, hear, smell, taste, and touch our way around. If one of your senses is not working properly, your brain fills in the gaps by paying more attention to the other senses. However, your other senses cannot always fill in the gaps. If your ears are not working, your eyes alone may not be able to tell your brain that an out-of-control car is screeching toward you! But what if we could help the brain fill in the gaps by purposefully sending the missing information through another sense? What if you could “hear” where a sound is through your sense of touch? This article will explain how people were able to do just that, using wristbands that converted sound into vibration.

SPECIFICITY OF THE ARCHITECTURAL AND SPATIAL ORGANIZATION OF THE PETROGRAD SIDE OF ST. PETERSBURG

The preservation of the historical, urban planning and architectural heritage of the central territories of St. Petersburg requires a special approach to solving the problems of reconstruction and renovation of the historical urban environment. The modern period, characterized by active reconstruction of the historical center, puts forward new requirements for the preservation of cultural heritage sites. The att itude to history as an experience, on which modern practice should be based, presupposes the disclosure of historical architectural and urban planning processes on the basis of systematization of existing and fi lling in missing information. This allows us to analyze the spatial and temporal transformations that the city underwent in the course of its development. Revealing the internal laws of the genesis of these processes is of great importance. The article analyzes the state of urban landscapes within the boundaries of the historical territories of the Petrogradsky district of St. Petersburg.

Bioindicators of homeostasis’ constants of growing conditions of warm-water aquaculture objects in the context of obtaining marketable products

To create recommendations regarding the technological process of growing objects of warm-water aquaculture, the health of individuals in the created conditions of maintain is a necessary study. Taking into account the similarity of the necessary conditions for the organization of growing warm-water aquaculture objects, it is important to monitor the indicators that are bioindicators of homeostasis constants with a projection on the conditions of maintain, for subsequent adjustment of satisfactory conditions of maintain. First of all, these are hematological and biochemical bioindicators that determine the general characteristics of blood in the case of fish objects of sterlet and hemolymph in the case of crustacean objects of Australian freshwater crayfish and the concentration index of total serum protein that determines the “physiological norm”. When growing sterlet, a high level of total blood protein was established at 40.14±1.73 g/l and the hemolymph of the Australian freshwater crayfish was determined to have a protein concentration of 40.8±4.5 g/l. The presented analysis of bioindicators complements the missing information for monitoring the data of representatives of warm-water aquaculture, which will be valuable for specialists engaged in breeding these objects.