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The song of air and water: Acoustic experiments with an Ecuadorian Whistle Bottle (c.900 BC–100 BC)

Mónica Amparo Ayala Esparza, Galo Fernando Gallardo Carrillo, Miguel Molina-Alarcón • Internet Archaeology (2019)

In Ecuador, bottles as containers for liquids appeared in the Late Formative period at the end of the Machalilla culture (1600 BC to 800 BC). Whistle bottles were created and perfected during the Chorrera culture (900 BC to 100 BC), and fin...

DOAJ Open Access (DOAJ) DOI: 10.11141/ia.52.2

Weirs in the Waterworks of the Tsarev Settlement

Savel’ev Nikita I. • Поволжская археология (2013)

The location and design of weirs as part of water supply system on the Tsarev settlement and its neighborhood are considered in the article. The descriptions of the 19th – early 20th cc. and archaeological data made it possible to establish...

DOAJ Open Access (DOAJ) DOI: 10.24852/pa2013.4.6.155.166

The Numerical Solution of Fractional Parabolic Partial Integro-Differential Eequations by Gaussian and Inverse Multiquadric Radial Basis Functions

F. S. Aghaei Maybodi, M. H. Heydari, F. M. Maalek Ghaeini, M. H. Akrami • پژوهش‌های ریاضی (2021)

Introduction Many mathematical formulations of physical phenomena contain integro-differential equations. These equations arise in fluid dynamics, biological models, chemical kinetics, ecology, control theory of financial mathematics, aeros...

DOAJ Open Access (DOAJ)

Ground calibration tests of the laser altimeter (LIDAR) for MMX mission

Hiroki Senshu, Takahide Mizuno, Toru Nakura, Ryo Suetsugu et al. • Progress in Earth and Planetary Science (2025)

Abstract The spacecraft for the Japanese Martian Moon eXploration mission is equipped with a LIDAR laser altimeter. The slant range continuously measured by the LIDAR is used for the correction of the local topography and the orbit and atti...

DOAJ Open Access (DOAJ) DOI: 10.1186/s40645-025-00705-7

Research Progresses of Flash Evaporation in Aerospace Applications

Wei Ma, Siping Zhai, Ping Zhang, Yaoqi Xian et al. • International Journal of Aerospace Engineering (2018)

Liquid is overheated and evaporated quickly when it enters into the environment with lower saturation pressure than that corresponding to its initial temperature. This phenomenon is known as the flash evaporation. A natural low-pressure env...

DOAJ Open Access (DOAJ) DOI: 10.1155/2018/3686802

Attitude Control of a Vehicle with Active Airfoil and Suspension Systems Using Integral Action for Body Angle and Tire Deflection

Syed Babar Abbas, Iljoong Youn • Actuators (2026)

This paper presents a novel approach to design an attitude motion control strategy of a vehicle to mitigate lateral or longitudinal inertial forces acting on the passenger during cornering, braking, and acceleration maneuvers. The collabora...

DOAJ Open Access (DOAJ) DOI: 10.3390/act15060317

Concept of Sporadic E Monitoring Using Space-Based Low Power Multiple Beacon-Systems

Jurgen Vanhamel, Marc Berwaerts, Stefano Speretta, Sevket Uludag • Atmosphere (2024)

Current monitoring systems to detect sporadic E use ground-based setups, ionosondes, and the network of GNSS satellites in order to assess the phenomenon of sporadic E. This paper aims to monitor sporadic E using a miniature space-based pla...

DOAJ Open Access (DOAJ) DOI: 10.3390/atmos15111306

Numerical Simulation of an Intramedullary Elastic Nail: Expansion Phase and Load-Bearing Behavior

Giulia Pascoletti, Filippo Cianetti, Giovanni Putame, Mara Terzini et al. • Frontiers in Bioengineering and Biotechnology (2018)

The Marchetti-Vicenzi's nail is an intramedullary device where six curved nails are kept straight by a closing ring in order to allow their insertion into the medullary canal of a long bone; in a following step, these nails stabilize the fr...

DOAJ Open Access (DOAJ) DOI: 10.3389/fbioe.2018.00174

Urban Sprawl and Changes in Land-Use Efficiency in the Beijing–Tianjin–Hebei Region, China from 2000 to 2020: A Spatiotemporal Analysis Using Earth Observation Data

Meiling Zhou, Linlin Lu, Huadong Guo, Qihao Weng et al. • Remote Sensing (2021)

Sustainable development in urban areas is at the core of the implementation of the UN 2030 Agenda and the Sustainable Development Goals (SDG). Analysis of SDG indicator 11.3.1—Land-use efficiency based on functional urban boundaries—provide...

DOAJ Open Access (DOAJ) DOI: 10.3390/rs13152850

Lie similarity analysis of MHD Casson fluid flow with heat source and variable viscosity over a porous stretching sheet

Thenmozhi D, M. Eswara Rao, Ch. Nagalakshmi, RLV.Renuka Devi et al. • International Journal of Thermofluids (2024)

The current study presents a novel examination of heat transfer properties in a magnetohydrodynamic (MHD) flow of Casson fluid across a porous stretching sheet, uniquely incorporating the effects of heat source and variable viscosity. Unlik...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.ijft.2024.100804

Controlling Frost Propagation on Polymeric Surfaces Using SI‐ATRP Chemical Micropatterning

Miisa J. Tavaststjerna, Stephen J. Picken, Santiago J. Garcia • Advanced Materials Interfaces (2025)

Abstract Micropatterned surfaces with both hydrophilic and hydrophobic regions are relevant for a wide range of applications from fuel cells to water harvesting systems. The preferential nucleation of water on hydrophilic regions can also b...

DOAJ Open Access (DOAJ) DOI: 10.1002/admi.202400838

Disturbance Compensation Model Predictive Control for Free‑Floating Space Robots

LIU Jianxing, ZHANG Ouyang, MA Xiaolong, CHEN Meng et al. • Nanjing Hangkong Hangtian Daxue Xuebao (2026)

Free-floating space robots (FFSRs) have emerged as critical unmanned platforms for long-term in-orbit services thanks to their high mobility and extended operational lifespan. However, external disturbances caused by dynamic space environme...

DOAJ Open Access (DOAJ) DOI: 10.16356/j.2097-6771.2026.01.015

Observer-Based Robust Finite-Time Trajectory Tracking Control for a Stratospheric Satellite Subject to External Disturbance and Actuator Saturation

Shurui Huang, Yueneng Yang, Ye Yan, Shifeng Zhang et al. • International Journal of Aerospace Engineering (2022)

The stratospheric satellite is regarded as an ideal stratosphere flight platform and is able to accomplish various missions such as surveillance, earth observation, and remote sensing, which requires a robust and effective trajectory tracki...

DOAJ Open Access (DOAJ) DOI: 10.1155/2022/1601771

Blood pressure and mortality after percutaneous coronary intervention: a population-based cohort study

Chung-woo Lee, Joo Kyung Lee, Yeon Joo Choi, Hyunjin Kim et al. • Scientific Reports (2022)

Abstract Revascularization procedures, including percutaneous coronary intervention (PCI), for coronary artery disease (CAD) are increasingly performed in Korea. However, studies on blood pressure control targets in these patients remain in...

DOAJ Open Access (DOAJ) DOI: 10.1038/s41598-022-06627-4

Smoking behavior change and the risk of pneumonia hospitalization among smokers with diabetes mellitus

Dong-Woo Han, Wonyoung Jung, Kyu Na Lee, Kyungdo Han et al. • Scientific Reports (2023)

Abstract Smoking patients with diabetes mellitus (DM) are at greater risk of developing pneumonia. How smoking behavior changes affect the risk of pneumonia hospitalization, however, remains unclear. Therefore, we investigated the associati...

DOAJ Open Access (DOAJ) DOI: 10.1038/s41598-023-40658-9

Novel fractional integral inequalities for GA-Cr-convex functions and connections with information systems

Asfand Fahad, Zammad Ali, Shigeru Furuichi, Yuanheng Wang • Alexandria Engineering Journal (2025)

Due to applicability of mathematical inequalities in control systems, actuarial science, information theory and its utilization in other sciences, several researchers are inclined to prove their refinements and generalizations. In the study...

DOAJ Open Access (DOAJ) DOI: 10.1016/j.aej.2024.11.034

Empirical study on optimal reinsurance for crop insurance in China from an insurer's perspective

Xian-hua ZHOU, Yun-bo WANG, Hua-dong ZHANG, Ke WANG • Journal of Integrative Agriculture (2015)

This study investigates the optimal reinsurance for crop insurance in China in an insurer's perspective using the data from Inner Mongolia, Jilin, and Liaoning, China. On the basis of the loss ratio distributions modeled by AnHua Crop Risk ...

DOAJ Open Access (DOAJ) DOI: 10.1016/S2095-3119(14)60998-9