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New record of Vitreorana franciscana Santana, Barros, Pontes amp; Feio, 2015 (Anura, Centrolenidae), a glassfrog endemic to the Brazilian Cerrado
by
Guilherme Marson Moya
,
Fábio Maffei
,
Ezequiel da Silva Sousa
in
Amphibian
,
distribution
,
gallery forest
2024
We report a new locality for the endemic glassfrog Vitreorana franciscana Santana, Barros, Pontes & Feio, 2015 from Brazilian Cerrado, from the municipality of Nova Ponte, state of Minas Gerais, Brazil. Field visits were conducted in 2023 at Fazenda Brejão and resulted in the fourth record of this species, which expands this species’ geographic distribution by 150 km to the east. With the new record, the minimum convex polygon for the species is now 18,210 km2.
Journal Article
An innovative approach for gob‐side entry retaining in deep coal mines: A case study
2019
Due to the complex geostress and mining conditions in the coal seam with depth of 800 m, stability of surrounding rock for gob‐side entry retaining is very difficult to achieve. In this paper, we firstly propose an innovative bolt‐grouting controlled roof‐cutting for gob‐side entry retaining (BCR‐GER) approach for deep coal mines. Secondly, a mechanical model of “surrounding rock‐supporting body” for BCR‐GER is constructed, which consists of coal wall, roadside props, and gangues in gob (the whole supporting body). Thirdly, the key parameters (ie, cutting height, cutting angle, grouting cable length, and row of roadside props) are designed. Finally, field practice was applied at the No. 31120 haulage roadway of the Suncun coal mine in China, and in situ investigations were conducted for verification. Field measurement results show that maximum convergences of roof‐to‐floor and side‐to‐side were 264 mm and 113 mm, respectively. What is more, the maximum support resistance of roadside props was reduced by approximately 58%. The deformation and failure of surrounding rock were effectively controlled, and the pressure on roadside props was greatly reduced. This research fully considers the bearing properties of gangues in gob, eliminates the secondary disasters caused by borehole blasting, and provides guidance and reference for deep surrounding rock control of the same or similar gob‐side entry. An innovative approach of BCR‐GER for deep coal mines is proposed. Three key techniques of the BCR‐GER approach are introduced. The mechanical model of “surrounding rock‐supporting body” for BCR‐GER is developed. Four key parameters of the BCR‐GER approach are designed. Field practice verifies the effect of the BCR‐GER approach.
Journal Article
Energy Solutions for Wearable Sensors: A Review
2021
Wearable sensors have gained popularity over the years since they offer constant and real-time physiological information about the human body. Wearable sensors have been applied in a variety of ways in clinical settings to monitor health conditions. These technologies require energy sources to carry out their projected functionalities. In this paper, we review the main energy sources used to power wearable sensors. These energy sources include batteries, solar cells, biofuel cells, supercapacitors, thermoelectric generators, piezoelectric and triboelectric generators, and radio frequency (RF) energy harvesters. Additionally, we discuss wireless power transfer and some hybrids of the above technologies. The advantages and drawbacks of each technology are considered along with the system components and attributes that make these devices function effectively. The objective of this review is to inform researchers about the latest developments in this field and present future research opportunities.
Journal Article
Obituary
2023
An obituary for Ger Luitjen, head of the Rijksprentenkabinet, who died on Dec 19, 2022 is presented. Ger was a rare scholar who effortlessly combined object-based expertise and knowledge about artistic practice with a broad-ranging erudition in matters of iconography and cultural history. This was partly the result of his double training, first in drawing pedagogy in Breda in the late 1970s, later in art history at the University of Utrecht. More than anything, Ger's unparalleled scope was fostered by his insatiable curiosity and his inherent love for all forms of culture, including poetry and music.
Journal Article
Distribution law and control of the second invariant of deviatoric stress in gob-side entry retaining
2026
Taking the gob-side entry retaining (GER) in the 28,051 panel of Xinzhuang Coal Mine as the engineering background, this study introduces the second invariant of deviatoric stress (
J
₂) as a quantitative indicator of surrounding rock failure. By constructing mechanical model, performing FLAC
3D
numerical simulation, and conducting industrial experiment, the full-cycle failure evolution law of the surrounding rock and its control technology are systematically investigated. A mechanical model of the roadside filling body is established, from which the reasonable filling width beside the roadway is calculated to be 1.0 m. Simulation results indicate that during the early stage of GER, the
J
₂ of the surrounding rock exhibits a ring-shaped non-uniform distribution with peak values at a depth of 2.5 m in both the roof and the solid coal rib. In the middle stage, under strong mining disturbance, the
J
₂ peak shifts deeper to 4.5 m in the roof and 3.5 m in the coal rib. In the late stage, as the delayed working face distance increases, the peak value of
J
₂ show an increasing trend with gradually diminishing increments, stabilizing eventually. However, the peak value of
J
₂ at the solid coal side rib corner continues to rise. The
J
₂ distribution of filling body is approximately linear, with stress values increasing from the gob side to the roadway side, and the degree of stress concentration decreases with increasing delayed distance. Based on these findings, a support concept is proposed that requires anchor cables to penetrate through the
J
₂ peak zones of the solid coal rib and roof. This is integrated with high-density rock bolts and flexible cement slurry walls to form a comprehensive control technology for GER. Industrial practice demonstrates that the maximum roadway deformation is controlled within 294 mm, and the filling body deformation stabilizes around 90 mm, validating the effectiveness of the support design and achieving full-cycle stability control of the surrounding rock in GER.
Journal Article
An exploration of improving stability of gob-side entry retained with graded and zoned pressure relief technology: a case study
2024
To address the issues of uncertain pressure relief effectiveness and poor control of surrounding rock caused by the composite nature of the roof strata in the gob-side entry retained (GER), as well as significant changes in strata’s thickness and stability differences, this study focuses on the airway of the panel 3113 N in Longtan Coal Mine. Through field detection, theoretical analysis, and on-site applications, a stable mechanical model of the hard roof strata is established, elucidating the factors influencing fracture and instability in composite roof strata. The results indicate that roof stability of the GER depends on the position and ultimate load-bearing capacity of the hard roof strata, which in turn affects roof pressure relief effectiveness. Based on this, a roof classification method centered on “hard rock strata position and bearing capacity” is proposed. The retained roadway roof is categorized into four levels: Grade I (stable), Grade II (moderately stable), Grade III (unstable), and Grade IV (extremely unstable). Specific pressure relief methods, key parameters, roof control measures, and slope reinforcement methods are provided for each level of roof, forming a graded and zoned pressure relief technology for GER with composite roof. This approach emphasizes strong support and roof control, reinforced roadway sides, and precise roof cracking as core strategies. Field application results demonstrate that this graded and zoned pressure relief technology performs well, effectively maintaining stability of the surrounding rock in retained roadways.
Journal Article
A server-assisted secure blockchain model for residential demand response in smart grids
2026
The paper proposes a two layered blockchain-based residential demand side management (DSM) scheme that integrates a secure centralized server, (Energy Plus) EnPlus, and a private Ethereum blockchain to deliver both real-time operational efficiency and distributed transaction trust. The architecture also allows secure and transparent peer-to-peer energy trading using (Green Energy Reward) GER Tokens, which are controlled through Solidity-based smart contracts. Computationally demanding tasks of load forecasting, bid-offer matching and policy enforcement are carried out in the EnPlus server. The authorization of prosumers is provided through Public Key Infrastructure where AES-256 encryption is used when data from smart meter collected and uploaded to server and SHA-256 hashing with RSA is used to provide data confidentiality and integrity. The shiftable appliances are scheduled through Firefly Optimization Algorithm in two conditions: DSM without P2P trading and DSM with P2P trading using tokens to reduce the energy costs. The validity of the system is brought out with a case study of 52 prosumers (25 real prosumers and 27 are part of the extended project) within the climatic conditions of Kolkata with each having a 2.5 kW rooftop photovoltaic system. This system offers better savings and reduces peak to average ratio. P2P trading has typical financial advantages and it will lead to local energy independence but there will be little delays in transactions because of the hybrid processing model. The protocol is proven to be highly scalable, privacy preserving, and robust that offers a viable roadmap to secure, decentralized residential energy markets.
Journal Article
Behavior of Amagmatic Orogenic Geothermal Systems: Insights From the Agua Blanca Fault, Baja California, Mexico
by
Wanner, Christoph
,
Carbajal‐Martínez, Daniel
,
Diamond, Larryn W.
in
amagmatic orogenic geothermal system
,
Basement rock
,
Chemical composition
2024
Amagmatic geothermal systems within regional‐scale orogenic faults are promising renewable resources for heat and possibly electricity production. However, their behavior needs to be better understood to improve their exploration and assessment of energy potential. To provide more insight, we report geochemical, geological, and geophysical studies from seven hot spring sites strung along a 90 km segment of the Agua Blanca Fault, which traverses a mountainous region of northern Baja California, Mexico. Our results show that topographic heads drive infiltration of meteoric water deep into basement rocks, where it is heated according to the local geothermal gradients. Long paths lead to long water residence times and high 3He/Hetotal fractions. The hot water ascends along preferentially permeable zones within the ABF, discharging at temperatures from 37°C in inland springs to 102°C on the Pacific coast. Higher discharge temperatures correlate positively with the degree of extensional fault displacement (a proxy for fault permeability). Correlations between hydraulic head gradients, residence times, and 3He/Hetotal of the thermal waters show that the hydraulic head gradient controls the length and depth of the flow paths, whereas the magnitudes and locations of the discharge sites are controlled by fault permeability. Optimal conditions at the coast allow the 120°C temperature threshold for electricity production to be reached at relatively shallow depths (<2 km), demonstrating the potential of orogenic geothermal systems not only for exploitation of hot discharging water but also for EGS exploitation of the hot rocks that surround the water upflow zones. Plain Language Summary The deep circulation of meteoric water in areas not affected by volcanic heat represents underexplored renewable energy sources for heat or electricity production. A challenge for exploration is that the processes and forces that drive the hot water circulation in such systems are not fully understood. To obtain new insights, we undertook a geochemical, geological, and geophysical study of seven hot spring sites strung along a 90 km long fault zone across the northern Baja California Peninsula in Mexico. Our data show that rainwater infiltrates deep into mountainous areas and modifies its chemical composition and temperature in the absence of any magmatic heat source. We also discovered that the local permeability of the fault zones controls the discharge temperature of the hot springs and, thus, the amount of thermal energy that could be potentially exploited from such systems. Other relevant system parameters, such as the depth of water infiltration and the subsurface water residence time, are controlled by the differences in water pressure under high and low points in the topography and by the distance between the point of infiltration of rainwater and its subsequent discharge location. Key Points Topography‐driven circulation of rainwater through a permeable fault produces geothermal springs with temperatures up to 102°C Fault permeabilities and hydraulic head gradients control the thermal–hydraulic behavior of amagmatic geothermal systems Temperature of amagmatic geothermal systems reaches the threshold for electricity production at shallow depth (<2 km)
Journal Article
Seismically Imaged Crustal Breakup in the Southwest Taiwan Basin of the Northeastern South China Sea Margin
by
Zhong, Guangjian
,
Yu, Junhui
,
Chen, Changliang
in
Continental margins
,
crustal breakup
,
crustal thinning
2023
The Southern Depression of the Southwest Taiwan Basin is an ENE‐trending wide rift in the northeastern South China Sea margin. Though known as highly thinned, the maximum degree of crustal extension remains unclear. Here, we present three NW‐trending multi‐channel seismic profiles crossing the depression askew, and another profile traversing it, all of which image the basement and Moho clearly. The basement deepens toward the rift axis while the Moho shoals toward the axis, indicating significant crustal thinning. Faults appear with only small throws and are usually untraceable to depth. As the integral fault offset seems insufficient to match the horizontal crustal extension, the high crustal thinning is mainly accommodated by detachment faults. Only small‐scale post‐rift magmatic bodies and sporadic sills are observed, and syn‐rift magmatism is poor. The depression shows a recumbent V‐shaped valley opening to the northeast with the width increasing from 50 km on the southwestern profile to 96 km on the northeastern profile. Along the valley axis, the crust thins from 8.1 to 3.6 km and more thinner to the northeast, demonstrating enhanced extensional degree toward the northeast. A unique conch‐shaped package (up to ∼2 s two‐way travel time thick) with moderately coherent reflections is imaged atop the axial mantle on the northeastern profile. It was possibly formed by mantle exhumation, syn‐rift sedimentary uplift, or volcanic eruption. All these possibilities indicate that the crust probably broke up there, which represents a special style of crustal thinning different from other magma‐poor margins. Plain Language Summary Crustal breakup in passive continental margin is often observed in the continent‐ocean transition zone. It has also been speculated to occasionally occur in several intra‐continental rifts such as the Zhongjiannan Basin in the western South China Sea (SCS) and the Porcupine Basin in the southwestern Ireland, but clear seismic imaging is currently lacking. This study provides well‐imaged multi‐channel seismic profiles and shows a special conch‐shaped reflection package with a dome top in the Southwest Taiwan Basin of the northeastern SCS margin. The reflection package consists of several coherent reflections and is similar to the structures of exhumed serpentinized mantle, multi‐phase volcanic eruptions, or syn‐rift sedimentary uplift. All these possibilities suggest that the crust in the Southwest Taiwan Basin probably broke up during rifting. Key Points In the Southern Depression of the Southwest Taiwan Basin, a V‐shaped rift valley opening to the northeast is observed Along the rift valley axis, the continental crust thins significantly from the southwest toward the opening side A conch‐shaped reflection package with several coherent reflections exists at the opening side, representing likely crustal breakup
Journal Article
Preferences and Experiences of People with Chronic Illness in Using Different Sources of Health Information: Results of a Mixed-Methods Study
by
Griese, Lennert
,
Gille, Svea
,
Schaeffer, Doris
in
Analysis
,
Chronic Disease
,
Chronic diseases
2021
Background: People with chronic illness are particularly dependent on adequate health literacy (HL), but often report difficulties in accessing, understanding, appraising, and applying health information. To strengthen the HL of people with chronic illness, in-depth knowledge about how they deal with health information is crucial. Methods: To this end, quantitative data from the Second Health Literacy Survey Germany (HLS-GER 2) and qualitative data from seven focus group discussions were used to examine the interest in health information, preferred sources of information as well as experiences and challenges with information management among people with chronic illness. Results: The results show that people with chronic illness have a great interest in health information and use very different sources of health information, preferring personal information from physicians most. The results also point to several challenges in health information management that seem to be influenced by the illness duration as well as by the experiences made with the respective sources. Conclusions: Overall, the study provides important starting points for intervention development for the provision and communication of health-related information, but also to research on health information behavior and HL.
Journal Article