通讯机构：
[Zhu, HM ] U;Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;Hunan Prov Key Lab Adv Laser Mfg Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
distortion;laser repairing;microstructure;properties;scanning strategy;temperature distribution
摘要：
In order to explore the effects of scanning strategies on the distortion and properties of laser-repaired thin-plate components, four commonly used strategies, including continuous raster scanning strategy, continuous orthogonal scanning strategy (COS), subarea W-type scanning strategy and subarea leap-type scanning strategy, were applied for laser-repairing thin-plate 2Cr13 steel. The finite element simulation and experimental results show that the temperature field of the laser-repaired layer prepared by COS exhibits symmetrical elliptical characteristic, with homogeneous temperature gradient along all directions. Consequently, the outermost of COS sample exhibits the smallest deformation of 2.86 mm, by avoiding both the unidirectional shrinkage of molten pool and the cumulative effect of longitudinal stress. In contrast, much larger distortion was produced by the other three scanning strategies due to the uneven temperature gradient. Dense martensite without defects was achieved by continuous scanning, while the coarsen martensite occurred by using subarea scanning. The repaired layer by using subarea scanning exhibits lower microhardness of 585-590 HV0.2 and poor wear resistance of 1.45 x 10-5-1.48 x 10-5 mm3/N m, in comparison to 613-618 HV0.2 and 0.9 x 10-5-0.92 x 10-5 mm3/N m obtained by using continuous strategy. COS is the most ideal strategy in laser-repairing thin-plate 2Cr13 steel in this work, exhibiting the lowest distortion as well as the highest microhardness and wear resistance.
通讯机构：
[Li, T ] U;Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
摘要：
Low-concentration electrolyte demonstrates significant advantages in terms of low cost, low viscosity, and high wettability. However, its high solvent ratio usually induces a fragile organic-rich solid electrolyte interphase (SEI), which is not compatible with high-voltage lithium metal batteries (LMBs). Herein, a screening rule for diluents has been established based on the electrostatic potential, which guides the rational design of diluted low-concentration electrolyte (DLCE) with a high anion-to-solvent ratio. Specifically, the anti-solvating power of a diluent is positively correlated with its value of the most positive surface potential (ESPmax), and thus diluents with a high ESPmax value easily cause salt precipitation when diluting concentrated electrolyte to low concentration (<1 M). In light of this observation, a diluent with a low ESPmax value is selected to ensure the preparation of a transparent DLCE, thus maintaining a high anion-to-solvent ratio in DLCE. As an exemplary study, a 0.5 M ether-based DLCE is developed for high-voltage LMBs. Due to the high anion-to-solvent ratio, a robust LiF-rich SEI is formed and enables the stable operation of LMBs under high voltage (4.5 V) and a wide temperature range (-20 to 55 C-degrees). This work offers a guideline for screening diluents to design high-performance LCEs for high-voltage batteries.
期刊：
Separation and Purification Technology,2024年335:126214 ISSN：1383-5866
通讯作者：
Xie, D
作者机构：
[Li, Suzhe; Tang, Zengming; Yang, Xiaomin] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, D; Xie, Dong; Li, Suzhe; Tang, Zengming; Yang, Xiaomin] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.;[Xie, D; Xie, Dong] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xie, D ] N;Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
摘要：
Finding an inexpensive and efficient porous adsorbent to capture the gaseous radioiodine generated during spent fuel reprocessing has been challenging. Herein, we present a design philosophy for waste control to develop porous carbon for gaseous iodine capture from sewage sludge waste. Among them, the novel in situ etching of polytetrafluoroethylene was employed to improve pore accessibility. The hazards of the conventional preparation of sludge-derived carbon using highly corrosive NaOH and HF solutions were overcome. Polytetrafluoro-ethylene etched porous carbon with large specific surface area (1103 m2/g), interconnected hierarchical porous structure, and excellent hydrophobicity (water contact angle 126.52 degrees), providing efficient adsorption of gaseous iodine in hot (30-150 degrees C) and humid (50-96% relative humidity [RH]) environments. The iodine adsorption of hierarchical porous carbon was tested under static and dynamic conditions, and high records have been achieved. Notably, due to the structural advantage of hydrophobicity, a considerable dynamic adsorption capacity (1746.77 mg/g) was also maintained in a mixed iodine gas stream containing water vapor in a humid (50% RH) hot (75 degrees C) condition. This study is the first to use an in situ etching strategy for polytetrafluoroethylene, which opens a new avenue for converting sludge waste into low-cost porous carbon and provides an attractive option for capturing iodine in hot and humid environments.
关键词：
Composites aerogel;Colorimetry;Controllable catalysis;Recyclable and accurate detection;Visual and on -site sensing
摘要：
Colorimetric detection methods have been attracted and preferred for analytes assessment. Although simple and highly efficient colorimetric strategies based on nanozymes have been developed, there remain inherent problems of intrinsic color interference for accurate analysis and erratic activity to lose controllable, recyclable, and sensitive efficacies. Herein, we have prepared a novel composite aerogel named PACO that is rationally assembled by the poly (vinyl alcohol) aerogel (PVA aerogel) and copper oxide nanoparticles (CuO NPs) to address these challenges. PACO has been proved to exhibit the controllable peroxidase (POD)-like activity through separating the solid PACO from the aqueous solutions. Meanwhile, PACO can avoid intrinsic color interferences and provide more accurate detection performance for naked eye discrimination. Furthermore, PACO shows the recyclable and long lifetime performances for sensitive detection of water pollutants including hydroquinone (HQ) and catechol (CC) with the LOD of 0.084 mu M and 0.101 mu M, respectively. Finally, we have constructed a smartphone-based colorimetric detection platform to realize the on-site and visualanalysis of water pollutants in real water samples. Overall, PACO achieves the advanced detection performances to exhibit great potential in nanozymes based sensing method development and colorimetric-related analytical research.
期刊：
Physica Status Solidi-Rapid Research Letters,2024年18(2):2300334- ISSN：1862-6254
通讯作者：
Huo, SY
作者机构：
[Fu, Chun-Ming; Li, Hong-Kang; Huo, Shao-Yong; Yao, Long-Chao] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Huo, SY ] U;Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
关键词：
defect states;elastic valley edge states;power dividers;rainbow trapping;topological phononic crystals
摘要：
Topological phononic crystals (PnCs) with topologically protected boundary states have important applications in the fields of acoustic wave transmission and control. However, previous studies based on solid-state PnC systems are mostly limited by fixed structures, resulting in the difficulty to deform the edge states, which partly limits its practical applications. Herein, a 2D solid topological PnC coupled with the defect is designed to achieve the adjustable valley edge state and rainbow trapping. First, by breaking the spatial inversion symmetry, the valley Hall phase transition of elastic wave is realized and valley edge states are obtained. Next, by introducing defects of different widths between the two different valleys' topological PnCs, both the defect-adjusted valley edge state and defect state are achieved. Then, by designing different topological PnCs waveguides, the robust transport characteristics of the two above states are compared. Subsequently, a new power divider based on the defect-adjusted valley edge state is designed, which is found to possess various manners of operation such as equal and unequal power divisions. Finally, based on defect adjustment of the edge states, a rainbow trapping is implemented. This research provides an important guidance for ultrasonic devices, such as waveguides, energy harvesters, and power dividers. By introducing the line defects in the topological domain wall for the elastic wave, the defect-adjusted valley edge states and defect states are presented, which further are applied to design the novel elastic ultrasonic devices, such as the equal or unequal power dividers and the rainbow trapping effects.image & COPY; 2023 WILEY-VCH GmbH
摘要：
Given that intricate toxicological profiles exist among different antibiotics and pose serious threats to the environment and human health, synchronous analysis of multiple residues becomes crucial. Sensor arrays show potential to achieve the above purpose, but it is challenging to develop easy-to-use and high-sensitivity tools because the state-of-the-art arrays often require more than one recognition unit and are monosignal dependent. Here we exquisitely designed a fluorescent nanoprobe (2-aminoterephthalic acid-anchored CdTe quantum dots with Eu3+ coordination, CdTe-ATPA-Eu3+) featuring triple emissions at the same excitation as the only element to fabricate a luminescent sensor array with ratiometric calculations for identifying multiple antibiotics. By taking tetracycline, chlortetracycline, doxycycline, oxytetracycline, penicillin G, and sulfamethoxazole as models, the six species exhibited distinguishable motivation or/and quenching impacts on the three emissions of CdTe-ATPA-Eu3+, which were employed as indicators to perform the ratiometric logical operation and further combined with pattern recognition analysis for multitarget determination. Evidently, such a design exhibits two advances: (1) with the triple-emission probe as the sole receptor requiring neither internal nor external adjustments, the fabricated array acts as an extremely facile tool for multianalyte detection; (2) the ratiometric calculations offer excellent sensitivity and reliability for high-performance determination. Consequently, accurate identification and quantification of individual antibiotics and their combinations at various levels were verified in both laboratory and practical matrices. Our work provides a new tool for simultaneously detecting multiple antibiotics, and it will inspire the development of advanced sensor arrays for multitarget analysis.
摘要：
BACKGROUND: The newly approved third-generation oral anti-HIV-1 drug, ainuovirine (ANV), was used in combination with nucleoside reverse transcriptase inhibitors (NRTIs) in our study, and its effects on the lipid profile of antiretroviral-experienced HIV/AIDS patients are unclear. OBJECTIVES: This study aimed to examine the effects of antiretroviral agents on the lipid profile in patients with HIV/AIDS. METHODS: We conducted a real-world prospective study involving treatment-naive and treatment-experienced adult participants living with HIV-1 infection provided with ANV- or efavirenz (EFV)-based regimens. The primary endpoint was the proportion of participants with an HIV-1 RNA level of <50 copies/mL at week 24 of treatment. Secondary endpoints included the change from baseline in CD4+ T-cell count and lipid profile. RESULTS: A total of 60 treatment-naive and 47 treatment-experienced participants received an ANV-based regimen, while 88 treatment-naive and 47 treatment-experienced participants receiving an EFV-based regimen were, respectively, matched as controls. At week 24 following treatment, the proportion of participants with an HIV-1 RNA level of <50 copies/mL and the mean changes of CD4+ T-cell counts from baseline were significantly higher in naive-ANV group than those in naive-EFV group (p < 0.01). Compared with the EFV group, both naive and experienced ANV groups exhibited a favorable lipid profile, including constant changes in total cholesterol and triglycerides, a significant decrease in LDL-cholesterol (p < 0.0001), and a dramatic increase in HDL-cholesterol (p < 0.001). CONCLUSION: The efficacy of ANV was non-inferior to EFV when combined with two NRTIs. Patients receiving ANV-based regimens had a decreased prevalence of dyslipidemia.
通讯机构：
[Liu, M ] U;Univ South China, Coll Nucl Sci & Technol, Hengyang 421200, Hunan, Peoples R China.;Zhuhai Tsinghua Univ, Res Inst Innovat Ctr, 101 Univ Ave, Zhuhai 519000, Peoples R China.
摘要：
In this study, DyFe1-xCrxO3 (DFCO) was synthesized by sol-gel and underwent magnetic measurements and analysis. The experimental data were fitted and calculated by a four-sublattice molecular field model. Unlike previous studies, we found that in DyFe1-xCrxO3, the spin of the A-site rare earth ion Dy3+ also changed simultaneously with the spin reorientation of the Fe3+/Cr3+ ions. The effective spin is defined as the projection of the A site's total spin on the B site's spin plane, and the curve of temperature changes was obtained after fitting. This is convincing and, at the same time, provides a reference for the development of spintronic devices in the future.
摘要：
Cancer immunotherapy, particularly with immune checkpoint inhibitors, has revolutionized the paradigm of cancer treatment. Nevertheless, the efficacy of cancer immunotherapy remains limited in most clinical settings due to the lack of a preexisting antitumor T-cell response in tumors. Therefore, the clinical outcomes of cancer immunotherapy must be improved crucially. With increased awareness of the importance of the innate immune response in the recruitment of T cells, as well as the onset and maintenance of the T cell response, great interest has been shown in activating the cGAS-STING signaling pathway to awaken the innate immune response, thereby orchestrating both innate and adaptive immune responses to induce tumor clearance. However, tumor cells have evolved to overexpress ectonucleotide pyrophosphate phosphodiesterase 1 (ENPP1), which degrades the immunotransmitter 2',3'-cGAMP and promotes the production of immune-suppressing adenosine, resulting in inhibition of the anticancer immune response in the tumor microenvironment. Clinically, ENPP1 overexpression is closely associated with poor prognosis in patients with cancer. Conversely, depleting or inhibiting ENPP1 has been verified to elevate extracellular 2',3'-cGAMP levels and inhibit the generation of adenosine, thereby reinvigorating the anticancer immune response for tumor elimination. A variety of ENPP1 inhibitors have recently been developed and have demonstrated significant promise for cancer immunotherapy. In this review, we provide an overview of ENPP1, dissect its immunosuppressive mechanisms, and discuss the development of ENPP1 inhibitors with the potential to further improve the efficacy of cancer immunotherapy.
摘要：
In this paper, we give six classes of permutation polynomials of the form (x(pm) - x + delta)(s) + a(x) over F-2(2m) and six classes of permutation polynomials of the form (x(pm) - x + delta)(s) + ax(pm) + a(pm) x over F-p(2m) (p being an odd prime), respectively. In addition, we also investigate permutation polynomials obtained from piecewise functions. Consequently, we find some complete permutation polynomials.
作者机构：
[Liang, Xianxiao; Zhao, Yang; Shi, Xuan; Shi, X; Deng, Xueyi] Chongqing Univ Posts & Telecommun, Sch Optoelect Engn, Chongqing 400065, Peoples R China.;[Liang, Xianxiao; Zhao, Yang; Shi, Xuan; Shi, X; Xiao, Zeyun; Peng, Xiaoyu; Deng, Xueyi] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.;[Zhao, Hongquan] South China Univ, Sch Elect Engn, Hengyang, Peoples R China.;[Yuan, Hongkuan] Southwest Univ, Sch Phys Sci & Technol, Chongqing, Peoples R China.
通讯机构：
[Yuan, HK ; Zhao, HQ ] S;[Shi, X ] C;Chongqing Univ Posts & Telecommun, Sch Optoelect Engn, Chongqing 400065, Peoples R China.;Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.;South China Univ, Sch Elect Engn, Hengyang, Peoples R China.
关键词：
WSe2/Si2H heterojunction;first principles;extra electric field;optical absorption coefficient
摘要：
Van der Waals heterojunctions based on two-dimensional (2D) materials hold great potential applications in photodetectors. Using the density functional theory (DFT) method, the structures, electronic and optical properties of van der Waals WSe2/Si2H heterojunction are investigated. 1.32 eV of indirect bandgap is calculated from the WSe2/Si2H heterojunction, which is 0.3 eV and 0.1 eV smaller than those of its monolayer WSe2 and Si2H. This contributes to the photocarrier generations, and the Type-II heterojunction also benefits to the separation of the photogenerated electron and hole pairs. A significant hole mobility 1.05 x 10(4) cm(2) V-1 s(-1) of the heterojunction along the y-direction is obtained. Moreover, a high Ultraviolet light (UV) absorption coefficient is presented in the heterojunction. The heterojunction transforms to Type-I under a vertical electric field, with the bandgap, orientation and amount of transfer electrons modulated sufficiently. As a result, the optical absorption coefficient of the heterojunction is also improved significantly, leading to the red-shift of the absorption spectrum. These excellent properties address the WSe2/Si2H heterojunction one of the good candidates for UV detectors.
摘要：
Persistent photocatalysis has garnered significant attention due to its ability to sustain catalytic activity in dark by storing electrons. However, the practical application of persistent photocatalysis is hindered by limited electron storage capacity. Herein, we synthesized and demonstrated that Ti(3)C(2)/TiO(2)/Ag persistent photocatalyst has good electron storage capability. The electron storage capacity of Ti(3)C(2)/TiO(2)/Ag is up to 0.125μmol/mg, which is 2.5 times that of Ti(3)C(2)/TiO(2). The enhanced electron storage capacity resulted in improved dark-reaction activity because more electrons react with oxygen to form more radicals, as evidenced by degradation experiments of various organics. Especially, persistent photocatalytic degradation of tetracycline hydrochloride by Ti(3)C(2)/TiO(2)/Ag was achieved under natural outdoor conditions (from 2:00p.m. to 8:00p.m.). Additionally, the aid of oxidants such as peroxymonosulfate (PMS) can further improve the dark-reaction activity. TiO(2)/Ti(3)C(2)/Ag/PMS system exhibits excellent efficacy in removing tetracycline hydrochloride, oxytetracycline, rhodamine b, methyl orange, and methylene blue, with removal rates reaching 79.5 %, 81.4 %, 98.9 %, 99.1 %, and 99.2 %, respectively (15min of light-reaction and 45min of dark-reaction). This work provides a new strategy to enhance electron storage capacity and demonstrates that decoupling of light-reaction and dark-reaction may provide a new opportunity for photocatalytic removal of pollutants around the clock.
关键词：
Ti alloys;surface nitriding;microhardness;wear resistance;high-temperature oxidation resistance
摘要：
Titanium alloys are considered lightweight alloys and are widely applied across various industries. However, their low hardness, poor wear resistance, and limited oxidation resistance restrict their prospects for wider application. In this paper, nitride coatings were prepared using three preparation processes, namely laser surface nitriding (LSN), physical vapor deposition (PVD), and plasma ion implantation (PII). Their microstructure, microhardness, tribological behavior, and high-temperature oxidation characteristics were compared. The experimental results revealed that nitrided coatings were successfully prepared using the three methods. However, a comparison of these data shows that the LSN coating exhibited superior comprehensive performance. It achieved the maximum thickness within the shortest preparation time: the thickness was about 280 mu m and the deposition rate of the LSN method was 2250 and 90,000 times higher than those of the PVD and PII methods. Nitrides have high hardness, but the carrying capacity could be attributed to the thickness of the coatings: the PVD coating could withstand a force of 500 g, while the PII coating only withstood a force of less than 25 g. In addition, as hardness is the most important factor for excellent wear resistance, the average volumetric wear rate of the LSN and PVD coatings was about 9 x 10-6 mm3/m center dot N, and their relative wear resistance was 49.2 times that of Ti6Al4V. Meanwhile, the excellent bond between the LSN coating and the substrate was evidenced by a high-temperature oxidation test during a rapid heating-cooling cycle.
期刊：
Journal of the European Academy of Dermatology and Venereology,2024年 ISSN：0926-9959
通讯作者：
Zhao, FJ;Liu, SQ
作者机构：
[Xiong, Shun; Zhao, Feijun; Liu, Shuangquan; Liu, Zhaoping; Ding, Xuan; Huang, Shaobin; Yao, Jiangchen; Zhang, Xiaohong; Xu, Man] Univ South China, Hengyang Med Coll, Inst Pathogen Biol, Hengyang, Peoples R China.;[Xiong, Shun; Zhao, Feijun; Liu, Shuangquan; Liu, Zhaoping; Ding, Xuan; Huang, Shaobin; Yao, Jiangchen; Zhang, Xiaohong; Xu, Man] Univ South China, Hengyang Med Coll, Key Lab Special Pathogen Prevent & Control Hunan P, Hengyang, Peoples R China.;[Xiong, Shun; Zhao, Feijun; Liu, Shuangquan; Liu, Zhaoping; Ding, Xuan; Huang, Shaobin; Yao, Jiangchen; Zhang, Xiaohong; Xu, Man] Univ South China, Affiliated Hosp 1, Hengyang Med Coll, Dept Clin Lab Med, Hengyang, Peoples R China.;[Zhao, Feijun; Zhao, FJ] Univ South China, Hengyang Med Coll, Inst Pathogen Biol, Hengyang 421001, Peoples R China.;[Zhao, Feijun; Zhao, FJ] Univ South China, Hengyang Med Coll, Key Lab Special Pathogen Prevent & Control Hunan P, Hengyang 421001, Peoples R China.
通讯机构：
[Zhao, FJ ; Liu, SQ ] U;Univ South China, Hengyang Med Coll, Inst Pathogen Biol, Hengyang 421001, Peoples R China.;Univ South China, Hengyang Med Coll, Key Lab Special Pathogen Prevent & Control Hunan P, Hengyang 421001, Peoples R China.;Univ South China, Affiliated Hosp 1, Hengyang Med Sch, Inst Microbiol & Infect Dis,Dept Clin Lab Med, Hengyang 421001, Peoples R China.
摘要：
Treponema pallidum is the causative factor of syphilis, a sexually transmitted disease (STD) characterized by perivascular infiltration of inflammatory cells, vascular leakage, swelling and proliferation of endothelial cells (ECs). The endothelium lining blood and lymphatic vessels is a key barrier separating body fluids from host tissues and is a major target of T. pallidum. In this review, we focus on how T. pallidum establish intimate interactions with ECs, triggering endothelial dysfunction such as endothelial inflammation, abnormal repairment and damage of ECs. In addition, we summarize that migration and invasion of T. pallidum across vascular ECs may occur through two pathways. These two mechanisms of transendothelial migration are paracellular and cholesterol-dependent, respectively. Herein, clarifying the relationship between T. pallidum and endothelial dysfunction is of great significance to provide novel strategies for diagnosis and prevention of syphilis, and has a great potential prospect of clinical application.
关键词：
Space gravitational wave detection;Micro electric thruster;Hall thruster;Faraday probe;Response time
摘要：
An advanced Watt class Hall Micro Thruster (HMT) is offered for Space Gravitational Wave Detection (SGWD), and an investigation has been conducted on its start-up, shutdown, rise, and fall response times. The research involved creating a circuit for thruster discharge and signal acquisition, using a Faraday probe to measure the plasma plume signal generated by the thruster, and characterizing the thrust directly. Ultimately the response time of the thruster is extracted from the discharge current and Faraday current signals. The experimental results demonstrate that the HMT has a response time ranging from 1.08 ms to 16.76 ms at mass flow rates of 0.02 mg/s and 0.04 mg/s, meeting the SGWD requirements for micro thruster response time. This research provides a physical foundation and explanation for the variation of HMT response time with discharge voltage versus mass flow rate with several key parameters that affect HMT plasma discharge, such as neutral gas number density (n(n)) and ionization mean free path (lambda(i)). Furthermore, we have examined several anomalies in the signal. Overall, this research provides a brand-new method for measuring the thrust response time of electric thrusters.
摘要：
Titanium (Ti) alloys are widely used in high-tech fields like aerospace and biomedical engineering. Laser additive manufacturing (LAM), as an innovative technology, is the key driver for the development of Ti alloys. Despite the significant advancements in LAM of Ti alloys, there remain challenges that need further research and development efforts. To recap the potential of LAM high-performance Ti alloy, this article systematically reviews LAM Ti alloys with up-to-date information on process, materials, and properties. Several feasible solutions to advance LAM Ti alloys are reviewed, including intelligent process parameters optimization, LAM process innovation with auxiliary fields and novel Ti alloys customization for LAM. The auxiliary energy fields (e.g. thermal, acoustic, mechanical deformation and magnetic fields) can affect the melt pool dynamics and solidification behaviour during LAM of Ti alloys, altering microstructures and mechanical performances. Different kinds of novel Ti alloys customized for LAM, like peritectic alpha-Ti, eutectoid (alpha + beta)-Ti, hybrid (alpha + beta)-Ti, isomorphous beta-Ti and eutectic beta-Ti alloys are reviewed in detail. Furthermore, machine learning in accelerating the LAM process optimization and new materials development is also outlooked. This review summarizes the material properties and performance envelops and benchmarks the research achievements in LAM of Ti alloys. In addition, the perspectives and further trends in LAM of Ti alloys are also highlighted. Substantive review of innovations in methodology, process and materials of AM Ti alloys.Novel titanium alloys designed for laser additive manufacturing.Machine learning assisted alloy design and process optimization.Field-assisted additive manufacturing for titanium alloys fabrications.
摘要：
The super tau-charm facility (STCF) is an electron-positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 x 1035 cm-2 center dot s-1 or higher. The STCF will produce a data sample about a factor of 100 larger than that of the present tau-charm factory - the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.
作者：
Ji, Hong-Tao;Jiang, Jun;He, Wei-Bao;Lu, Yu-Han;Liu, Yuan-Yuan;...
期刊：
JOURNAL OF ORGANIC CHEMISTRY,2024年89(6):4113-4119 ISSN：0022-3263
通讯作者：
He, WM
作者机构：
[He, Wei-Bao; Lu, Yu-Han; He, Wei-Min; Li, Xiao; Ji, Hong-Tao; Liu, Yuan-Yuan; Jiang, Jun; He, WM] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.
通讯机构：
[He, WM ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.
摘要：
The first example of an electrochemical multicomponent synthesis of selenium-containing compounds with inexpensive and abundant elemental selenium as the selenating reagent was developed. A variety of selenazol-2-amines were constructed in high yields with good functional group tolerance under metal-free and chemical oxidant-free conditions.
通讯机构：
[Gu, YY ] U;Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Composite cathode;Stability;BSCF;PCFCs
摘要：
Improving chemical stability and performance is desirable for protonic ceramic cathodes (PCFCs). In this study, the proton conductor SrSn0.8Sc0.2O3-delta (SSSc) is used to couple the classically unstable Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) cathode to increase the chemical stability of the composite cathode. Compared to the conventional BSCF + BaCe0.7Zr0.1Y0.2O3-delta (BCZY) composite cathode, the new BSCF + SSSc cathode demonstrates enhanced chemical stability. This is a result of the superior chemical stability of SSSc, which protects BSCF. Moreover, the formation of oxygen vacancies is easier at the BSCF/SSSc interface than at the BSCF/BCZY interface, thereby enhancing the cathode oxygen reduction reaction (ORR) activity. The closer proximity of the O p-band center to the Fermi level in BSCF + SSSc compared to BSCF + BCZY further validates the higher ORR activity of the BSCF + SSSc cathode. The peak power density of the PCFC with BSCF + SSSc cathode, which reaches 1404 mW cm-2 at 700 degrees C, is significantly greater than that with BSCF + BCZY cathode. The protection of SSSc to BSCF is also reflected in the fuel cell's long-term operation, as the BSCF + SSSc cell operates without detectable degradations for more than 150 h, whereas the BSCF + BCZY cell exhibits observable degradation. These findings indicate that utilizing the SSSc proton conductor to couple the cathode material is a feasible and effective strategy for producing the composite cathode with high chemical stability and superior electrochemical performance for PCFCs.
通讯机构：
[Yang, SY ] U;Univ South China, Coll Publ Hlth, Hengyang Med Sch, Hengyang 421001, Hunan, Peoples R China.;Hunan Key Lab Typ Environm Pollut & Hlth Hazards, Hengyang 421001, Hunan, Peoples R China.
关键词：
Cobalt -nitrogen co -doped carbon dots;Colorimetric;Fluorometric;Dual -mode;Gallic acid
摘要：
Gallic acid (GA), widely used in food and medicine production industries. Herein, a kind of newly synthesized cobalt-nitrogen co-doped carbon dots (Co,N-CDs) with dual functional properties of oxidase-like activity and photoluminescence property could oxidize the 3,3 ',5,5 '-tetramethylbenzidine (TMB) to oxTMB with a new ab-sorption peak at 653 nm. In addition, it was found that oxTMB performed a fluorescence-quenching effect on Co, N-CDs at 440 nm attributed to FRET (Fluorescence resonance energy transfer). Reductive GA could reduce oxTMB to TMB, weaken the blue color, and restore the fluorescence of Co,N-CDs. Thus, a colorimetric and fluorometric method for dual-mode detection of GA was established. The synthesis of the dual-signal probe was completed with a single and environmental precursor in just one step. Simultaneously, the dual-mode detection reduced detection limits, broadened the linear range and improved anti-interference ability. This method exhibited a satisfactory application prospect in the actual detection of GA in tea beverages.
