Earth and rock dams are an important part of the flood control system, and hidden dangers in such dams are a serious threat to project safety. The application of a single geophysical exploration technology is associated with multiple solutions and limitations, and research on an integrated technology is meaningful for the timely detection and management of hidden dangers in earth and rock dams. This paper summarizes the respective advantages and limitations of geophysical exploration techniques for leakage detection in dams by sorting out and analyzing their principles and application characteristics. The principles of the integrated technology are outlined, and a data analysis system for GIS-based integrated geophysical exploration is elaborated. The challenges and shortcomings of the development of integrated geophysical exploration techniques are summarized. The theoretical model of integrated geophysical exploration information fusion technology based on data fusion and joint inversion is proposed. The feasibility of establishing the theoretical model based on data fusion and joint inversion is demonstrated, providing a direction for the development and practical application of integrated geophysical exploration techniques in the field of geotechnical engineering.
According to the actual conditions of the cost management, the optimization idea of engineering cost management of the phase of construct project inviting bids is probed from all round way .The purpose of this paper is to provide a reference to the owner, in order to reduce engineering cost and improve economic benefits.
Tactile-based sensing technology represents one of the most promising methods for interacting with their surrounding environment. Consequently, flexible tactile sensing has garnered significant attention from researchers worldwide. In this study, triboelectricity and piezoelectricity were combined to propose a multifunctional self-powered tactile sensor (MSPTS). Notably, new and innovative self-healing electrodes were embedded and synthesized from HPDMS (poly(dimethylsiloxane)) and boric acid in the MSPTS, MSPTS demonstrated a linear detection range of 0.25–5 kPa with a sensitivity of 246.28 mV/kPa, indicating substantial improvements in sensor sensitivity, output performance, and anti-interference capability. Our method of forming hydrogen bonds between a self-healing material (SHM) and a liquid metal (LM) effectively addressed the issue of LM leakage within the flexible matrix under pressure, thus preventing sensor failure. The borate dynamic bonding conferred self-healing properties to the electrode when it was damaged. The MSPTS was successfully applied to pressure detection, material identification, and human body movement detection, significantly broadening the application range of flexible electronic devices.
One-step solution process is the simplest method to fabricate organic-inorganic metal halide perovskite thin films, which however does not work well when employed in the planar-heterojunction (PHJ) solar cells due to the generally poor film morphology. Here we show that hydrazinium chloride can be used as an additive in the precursor solution to produce perovskite films featuring higher coverage and better crystallinity. The light absorption ability and charge carrier lifetime are both significantly improved accordingly. Under the optimal additive ratio, the average power conversion efficiency (PCE) of the inverted PHJ perovskite solar cells greatly increases by as much as 70%, and the champion device shows a satisfying PCE of 12.66%. These results suggest that N2H5Cl is a promising additive for fabricating high-efficiency perovskite solar cells via one-step method, which could be of interest in the future commercial solar cell industry.
In this work, the phenomenon of downward deviations from the Curie-Weiss law is found above the Curie temperature (329--458 K) in ${\mathrm{Ni}}_{2}\mathrm{MnSb}$ polycrystalline Heusler alloy, and it was confirmed by the change in inverse magnetic susceptibility under different magnetic fields that it is the Griffiths phase. This abnormal phenomenon can be attributed to short-range nanoferromagnetic clusters caused by local lattice distortion within the paramagnetic state. The ac magnetic susceptibility further showed characteristics of long-range disordered and short-range ordered glassy magnetic states in Griffiths phase range, where the magnetization intensity of the spin glass state has a frequency dependence. This work revealed the nature of the Griffiths phase in Heusler alloys and observed the characteristics of spin glass at high temperatures, providing experimental evidence and support for the study of high-temperature spintronics.
A unique yolk–shell FeP@C nanobox is synthesized by an etching-in-box combined with a phosphidation-in-box approach, manifesting remarkable pseudocapacitance-boosted lithium ion storage properties.
Cobalt–iron Prussian blue analogues are typical materials with a photomagnetic effect, capable of exhibiting significant magnetic polarization enhancement upon exposure to light. In this work, upon replacing Mn in Co-ion sites, the obtained KαMnxCo(1–x)[Fe(CN)6]β·nH2O Prussian blue analogues displayed an anomalous behavior of photoinduced magnetization changes, which correlates with the content of substituted Mn ions. Especially, for compounds with x ≥ 0.34, the photoexcitation led to the emergence of a novel demagnetization process characterized by a reduction in magnetic moments, which has not previously been reported. This phenomenon can be explained by the mechanism named spin down of Mn ions driven by metal-to-metal charge transfer (MMCT) between Fe and Co, wherein the bond elongation induced by MMCT between Fe and Co compresses the bond of the Mn ion, causing the rearrangement of spin in the Mn ion and eventually resulting in demagnetization.
Base on the research data of 21 indicators provided by Security Administration of Zhenjiang,,such as the declared emergency plan,the drills and training of emergency preplan,the plan amendments and mutual assistance agreement,the emergency rescue equipment and material parameter and other supplies ledger according to the related mathematical statistics methods,the research data were analyzed.The results showed that state-owned enterprises,foreign-funded enterprises and enterprises were still having a lack of convergence of business plan and business assistance agreement signed.The private sector in emergency rescue building was relatively weak,which embodied in that emergency education was not professional and general summary;emergency drills were not standardized,relatively small;lack of plan amendments and emergency supplies such as inspection system.According to issues identified in the research,the establishment of business parks was proposed,taking the advantage of management focus and unity of the park,government outsourcing the emergency rescue technology and improving emergency response and rescue capabilities could be achieved.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)