随钻测井用涡轮发电机叶轮组设计优化和试验研究

针对井下供电需求,在指定条件下对随钻测井用涡轮发电机叶轮组进行了设计和数值模拟,得出叶轮组的性能曲线,在此基础上采用基于响应面构建的全局优化算法对叶轮组进行了性能优化,并通过试验对优化设计结果进行了验证,结果吻合良好,证明设计、优化方法及工具可靠。

Application of Three-Dimensional Visualization Technology in Project Management of Offshore Platform Engineering Construction

Three-dimensional visualization technology converts engineering design drawings and data into graphics or images, realizes virtual reality perception of simulated users in future construction scene, enhances the interaction between project management and technical personnel and engineering construction achievement, and provides intuitive, flexible and strong realistic experience for project management. It can effectively improve the level of project communication, and assist the needs of project construction planning management, training, exhibition, etc. As a tool to help improve project management skills, it has good application effect and prospects.

Atom-economic macrocyclic amphiphile based on guanidinium-functionalized selenacrown ether acting as redox-responsive nanozyme

Control of self-assembly is significant to the preparation of supramolecular materials, but the control of hydration, responsiveness, dimension, catalysis of macrocyclic amphiphiles in an atom-economic manner is still a great challenge. The herein presented 527 Da low-molecular-weight macrocyclic amphiphile was fabricated by utilizing the selenium-containing crown ether as a hydrophobic motif together with guanidinium group as the hydrophilic moiety. The resulting benzo[21]crown-7 based macrocyclic amphiphile readily forms a redox-responsive solid nanoparticles in water, which can further interconnect into wrinkled pattern on-surface, as well as exhibits as a nanozyme for catalyzing disulfid bond formation. The present work highlights the great potential of guanidinium-and selenium-containing crown ethers for the control of functional assemblies.

Ultra-conformable liquid metal particle monolayer on air/water interface for substrate-free E-tattoo

Gallium-based liquid metal has gained significant attention in conformal flexible electronics due to its high electrical conductivity,intrinsic deformability,and biocompatibility.However,the fabrication of large-area and highly uniform conformal liquid metal films remains challenging.Interfacial self-assembly has emerged as a promising method,but traditional approaches face difficulties in assembling liquid metal particles.Here,we realized the multi-size universal self-assembly(MUS)for liquid metal particles with various diameters(<500μm).By implementing a z-axis undisturbed interfacial material releasing strategy,the interference of gravitational energy on the stability of floating particles is avoided,enabling the fabrication of ultra-conformable monolayer films with large areas(>100 cm^(2))and high floating yield(50–90%).Moreover,the films can be conformally transferred onto complex surfaces such as human skin,allowing for the fabrication of substrate-free flexible devices.This eliminates interference from traditional substrate mechanical responses,making the liquid metal e-tattoo more user-friendly.

Resistive switching effects in oxide sandwiched structures

Resistive switching （RS） behaviors have attracted great interest due to their promising potential for the data storage. Among various materials, oxide-based devices appear to be more advantageous considering their handy fabrication and compatibility with CMOS technology, though the underlying mechanism is still controversial due to the diversity of RS behaviors. In this review, we focus on the oxide-based RS memories, in which the working mechanism can be understood basically according to a so-called filament model. The filaments formation/rupture processes, approaches developed to detect and characterize filaments, several effective attempts to improve the performances of RS and the quantum conductance behaviors in oxide-based resistive random access memory （RRAM） devices are addressed, respectively.

Successful spontaneous pregnancy with acupuncture after premature ovarian failure

In this paper, a case of premature ovarian failure （POF）, accompanied with amenorrhea for 2 years was reported. After 2 months of acupuncture, the patient＇s menstruation was resumed, and after 11 months of treatment, the patient had a spontaneous pregnancy. It is suggested that acupuncture should be used for the patient with POF as early as possible, and if necessary, hormone replacement therapy is still needed, and it is still expected to obtain spontaneous pregnancy before completely exhausted of ovarian function.

Acidification and bubble template derived porous g-C_(3)N_(4) for efficient photodegradation and hydrogen evolution

Graphitic carbon nitride(g-C_(3)N_(4))as a metal-free candidate of photocatalyst has received worldwide attention because of its great potentials in solar light-induced degradation and hydrogen evolution,yet the industrial application is seriously hindered by the small specific surface area and rapid recombination rate of carriers.Herein,we demonstrate that porous g-C_(3)N_(4)(HCl-CNU-X)can be prepared via the copolymerization of acidified melamine and a green bubble template(urea).Transmission electron microscopy and nitrogen sorption characterization results show that the prepared HCl-CNU-X possesses an in-plane porous structure and large specific surface area,enabling the exposure of more accessible active sites.As a result,HCl-CNU-X exhibits both enhanced photocatalytic tetracycline hydrochloride degradation and higher hydrogen evolution than bulk g-C_(3)N_(4).The boosted photocatalytic performance was ascribed to the formation of the porous structure,which dramatically promotes the separation of charge-carriers and facilitates the electron transfer.This work demonstrates that the acidification of nitrogen-rich precursors combined with a bubble-template can develop a new paradigm of highly porous photocatalysts for environmental remediation and water splitting.

Ion transport-related resistive switching in film sandwich structures

Resistive switching memories based on ion transport and related electrochemical reactions have been extensively studied for years.To utilize the resistive switching memories for high-performance information storage applications,a thorough understanding of the key information of ion transport process,including the mobile ion species,the ion transport paths,as well as the electrochemical reaction behaviors of these ions should be provided for material and device optimization.Moreover,ion transport is usually accompanied by processes of microstructure modification,phase transition,and energy band structure variation that lead to further modulation of other physical properties,e.g.,magnetism,optical emission/absorbance,etc.,in the resistive switching materials.Therefore,novel resistive switching memories that are controlled through additional means of magnetic or optical stimulus,or demonstrate extra functionalities beyond information storage,can be made possible via well-defined ion transportation in various switching materials and devices.In this contribution,the mechanism of ion transport and related resistive switching phenomena in thin film sandwich structures is discussed first,followed by a glanceat the recent progress in the development of high-performance and multifunctional resistive switching memories.A brief perspective of the ion transport-based resistive switching memories is addressed at the end of this review.

The dynamic covalent reaction based on diselenide-containing crown ether irradiated by visible light

A novel diselenide-containing crown ether(BC7Se_(2))was fabricated,which can polymerize to form cyclic oligomers through intermolecular dynamic covalent reaction by irradiation of visible light.The size and distribution of oligomers are related to the monomer concentration.The decomposition reaction of oligomers is controlled by topology and solvents.Furthermore,potassium cation can inhibit the polymerization of BC7Se_(2)and accelerate the decomposition of oligomers.