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991.
992.
Bowen Lv Robert Mücke Xueling Fan T.J. Wang Olivier Guillon Robert Vaßen 《Journal of the European Ceramic Society》2018,38(15):5092-5100
Sintering is one of the key issues in the high temperature service of thermal barrier coatings (TBCs), considering the continuously increasing operation temperature of gas-turbine for higher energy efficiency. Based on the conventional processing method of air plasma spraying (APS), suspension plasma spraying (SPS) technique has been developed recently, in order to improve the strain tolerance of TBCs. This strain tolerance of plasma-sprayed TBCs is largely effected by the sintering behavior, which is presently not fully understood. In this work, evolution of mechanical properties, in terms of Young’s modulus and viscosity, is systematically investigated by in-situ three-point bending test at 1200?°C on free-standing coatings, including micro-cracked APS, segmented APS, vertically cracked SPS and columnar structured SPS TBCs and correlated to the microstructural evolution. Based on experimental results, power law relations are proposed for the sintering induced mechanical evolution, which deepen the understanding of the sintering behavior of plasma-sprayed TBCs. 相似文献
993.
Jing Lou Hua Ma Jun Wang Ruisheng Yang Bowen Dong Ying Yu Jiafu Wang Fuli Zhang Yuancheng Fan Mingde Feng Zhiqiang Li Cewen Nan Shaobo Qu 《Advanced Electronic Materials》2020,6(2)
Tuning the carrier behavior in a heterostructure is important for designing well‐performing electro‐optical devices. Scientific research has mainly focused on 2D and layered materials due to their high carrier mobility. Ferroelectrics exhibit a strong response to external fields and are widely employed in microwave and terahertz (THz) tunable devices. By constructing a ferroelectric‐silicon PN heterojunction, a new strategy is proposed to construct a nonequilibrium carrier layer and achieve tunable carrier effects under multifield coupling. Theoretically, the formation of a carrier layer based on the interaction between free carriers and bound surface charges is analyzed, and a design method for PN heterojunction engineering is presented. Experimentally, a PN heterojunction of Ba0.7Sr0.3TiO3 thin film on silicon substrate is constructed, and three tunable carrier effects are achieved. A broadband tunable THz modulator with an amplitude modulation depth of 99.5% is realized, which is superior to other works. The volt–ampere effect of the PN heterojunction can be dynamically adjusted. The shape of the hysteresis loops can be dynamically controlled in real time. This proposed strategy for carrier modulation is a giant step forward in ferroelectrics applications and a path for the development of electro‐optical applications with new materials. 相似文献
994.
Hyun Ho Kim Shengwei Jiang Bowen Yang Shazhou Zhong Shangjie Tian Chenghe Li Hechang Lei Jie Shan Kin Fai Mak Adam W. Tsen 《Advanced materials (Deerfield Beach, Fla.)》2020,32(2):1905433
Memristive devices whose resistance can be hysteretically switched by electric field or current are intensely pursued both for fundamental interest as well as potential applications in neuromorphic computing and phase-change memory. When the underlying material exhibits additional charge or spin order, the resistive states can be directly coupled, further allowing electrical control of the collective phases. The observation of abrupt, memristive switching of tunneling current in nanoscale junctions of ultrathin CrI3, a natural layer antiferromagnet, is reported here. The coupling to spin order enables both tuning of the resistance hysteresis by magnetic field and electric-field switching of magnetization even in multilayer samples. 相似文献
995.
Bowen Yang Li Ding Heliang Yao Yu Chen Jianlin Shi 《Advanced materials (Deerfield Beach, Fla.)》2020,32(12):1907152
Nanocatalytic medicine has been developed recently to trigger intratumoral generation of highly toxic reactive oxygen species (ROS) for cancer therapy, which, unfortunately, suffers from compromised therapeutic efficacy due to a self-protective mechanism, autophagy, of cancer cells to mitigate oxidative damage. In this work, during the efforts of ROS generation by nanocatalytic medicine, a pharmacological autophagy inhibition strategy is implemented for augmenting ROS-induced oxidative damage for synergetic cancer therapy. An iron-containing metal-organic framework [MOF(Fe)] nanocatalyst as a peroxidase mimic is used to catalyze the generation of highly oxidizing •OH radicals specifically within cancer cells, while chloroquine is applied to deacidify lysosomes and inhibit autophagy, cutting off the self-protection pathway under severe oxidative stress. Cancer cells fail to extract their components to detoxicate and strengthen themselves, finally succumbing to the ROS-induced oxidative damage during nanocatalytic therapy. Both in vitro and in vivo results demonstrate the synergy between nanocatalytic therapy and autophagy inhibition, suggesting that such a combined strategy is applicable to amplify tumor-specific oxidative damage and may be informative to future design of therapeutic regimen. 相似文献
996.
Rui Gong Bowen Liu Xiaolei Wang Shichao Du Ying Xie Wanqi Jia Xinxin Bian Zhimin Chen Zhiyu Ren 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(4):2204889
Exquisite design of RuO2-based catalysts to simultaneously improve activity and stability under harsh conditions and reduce the Ru dosage is crucial for advancing energy conversion involving oxygen evolution reaction (OER). Herein, a distinctive cobalt-doped RuOx framework is constructed on Co3O4 nanocones (Co3O4@CoRuOx) as a promising strategy to realize above urgent desires. Extensive experimental characterization and theoretical analysis demonstrate that cobalt doped in RuOx lattice brings the oxygen vacancies and lattice contraction, which jointly redistribute the electron configuration of RuOx. The optimized d-band center balances the adsorption energies of oxygenated intermediates, lowing the thermodynamical barrier of the rate-determining step; and meanwhile, the over-oxidation and dissolution of Ru species are restrained because of the p-band down-shifting of the lattice oxygen. Co3O4@CoRuOx with 3.7 wt.% Ru delivers the extremely low OER overpotentials at 10 mA cm−2 in alkaline (167 mV), neutral (229 mV), and acidic electrolytes (161 mV), and super operating stability over dozens of hours. The unprecedented activity ranks first in all pH-universal OER catalysts reported so far. These findings provide a route to produce robust low-loading Ru catalysts and an engineering approach for regulating the central active metal through synergy of co-existing defects to improve the catalytic performance and stability. 相似文献
997.
Qiong Li Siyuan Qin Hailong Tian Ruolan Liu Ling Qiao Shanshan Liu Bowen Li Mei Yang Jiayan Shi Edouard C. Nice Jingquan Li Tingyuan Lang Canhua Huang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(23):2207201
Insufficienct T lymphocyte infiltration and unresponsiveness to immune checkpoint blockade therapy are still major difficulties for the clinical treatment of pancreatic ductal adenocarcinoma (PDAC). Although econazole has shown promise in inhibiting PDAC growth, its poor bioavailability and water solubility limit its potential as a clinical therapy for PDAC. Furthermore, the synergistic role of econazole and biliverdin in immune checkpoint blockade therapy in PDAC remains elusive and challenging. Herein, a chemo-phototherapy nanoplatform is designed by which econazole and biliverdin can be co-assembled (defined as FBE NPs), which significantly improve the poor water solubility of econazole and enhance the efficacy of PD-L1 checkpoint blockade therapy against PDAC. Mechanistically, econazole and biliverdin are directly released into the acidic cancer microenvironment, to activate immunogenic cell death via biliverdin-induced PTT/PDT and boost the immunotherapeutic response of PD-L1 blockade. In addition, econazole simultaneously enhances PD-L1 expression to sensitize anti-PD-L1 therapy, leading to suppression of distant tumors, long-term immune memory effects, improved dendritic cell maturation, and tumor infiltration of CD8+T lymphocytes. The combined FBE NPs and α-PDL1 show synergistic antitumor efficacy. Collectively, FBE NPs show excellent biosafety and antitumor efficacy by combining chemo-phototherapy with PD-L1 blockade, which has promising potential in a precision medicine approach as a PDAC treatment strategy. 相似文献
998.
Wanqi Jia Bowen Liu Rui Gong Xinxin Bian Shichao Du Siyu Ma Zichen Song Zhiyu Ren Zhimin Chen 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(39):2302025
The renewable electricity-driven hydrogen evolution reaction (HER) coupled with biomass oxidation is a powerful avenue to maximize the energy efficiency and economic feedback, but challenging. Herein, porous Ni-VN heterojunction nanosheets on nickel foam (Ni-VN/NF) are constructed as a robust electrocatalyst to simultaneously catalyze HER and 5-hydroxymethylfurfural electrooxidation reaction (HMF EOR). Benefiting from the surface reconstruction of Ni-VN heterojunction during the oxidation process, the derived NiOOH-VN/NF energetically catalyzes HMF into 2,5-furandicarboxylic acid (FDCA), yielding the high HMF conversion (>99%), FDCA yield (99%), and Faradaic efficiency (>98%) at the lower oxidation potential along with the superior cycling stability. Ni-VN/NF is also surperactive for HER, exhibiting an onset potential of ≈0 mV and Tafel slope of 45 mV dec−1. The integrated Ni-VN/NF||Ni-VN/NF configuration delivers a compelling cell voltage of 1.426 V at 10 mA cm−2 for the H2O-HMF paired electrolysis, about 100 mV lower than that for water splitting. Theoretically, for Ni-VN/NF, the superiority in HMF EOR and HER is mainly dominated by the local electronic distribution at the heterogenous interface, which accelerates the charge transfer and optimize the adsorption of reactants/intermediates by modulating the d-band center, therefore being an advisable thermodynamic and kinetic process. 相似文献
999.
Kezheng Tao Bowen Zhang Qiang Li Qingfeng Yan 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(15):2207663
The lead-free hybrid perovskite piezoelectrics possess advantages of easy processing, light weight, and low-toxicity over inorganic ceramics. However, the lack of understanding in structure–property relationships hinders exploration of new molecular piezoelectric crystals with excellent performances. Herein, by introducing chiral α-phenylethylammonium (α-PEA+) cations into bismuth-based hybrid halides, centimeter-sized (R-α-PEA)4Bi2I10 and (S-α-PEA)4Bi2I10 single crystals with a superior piezoelectric voltage coefficient g22 of 309 mV m N−1, are obtained. Structural rigidity in crystals leads to a remarkable electrostrictive coefficient Q22 of 25.8 m4 C−2, nearly 20 times higher than that of poly(vinylidene fluoride) (PVDF), which is beneficial to improve piezoelectricity with the synergistic effect of chirality. Moreover, the as-grown crystals show outstanding phase stability from 173 K to ≈470 K. This work suggests a design strategy based on rigidity and chirality to exploit novel piezoelectrics among hybrid metal halides. 相似文献
1000.
Shunda Zhan Bowen Liu Xuemeng Yu Xihan Chen Guosong Zeng Yonghua Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(14):2205720
Nanoporous single-crystal silicon carbide (SiC) is widely used in various applications such as protein dialysis, as a catalyst support, and in photoanodes for photoelectrochemical water splitting. However, the fabrication of nano-structured SiC is challenging owing to its extreme chemical and mechanical stability. This study demonstrates a highly-efficient, open-circuit electrolytic plasma-assisted chemical etching (EPACE) method without aggressive fluorine-containing reactants. The EPACE method enables the nano-structuring of SiC via a plasma-enveloped microtool traversing over the target material in an electrolyte bath. Through process design, EPACE readily produces a uniform nanoporous layer on a 4H-SiC wafer in KOH aqueous solution, with adjustable pore diameters in the range 40–130 nm. Plasma diagnosis by optical emission spectrometry (OES) and surface microanalysis reveal that EPACE realizes a nanoporous structure by electrolytic plasma-assisted oxidation and subsequent thermochemical reduction of an oxide. An increase in voltage or a decrease in etch gap intensifies the plasma and improves the etching efficiency. The maximum etch rate and depth reach 540 nm min−1 and 10 µm, respectively, demonstrating the significant potential of the approach as a time-saving and sustainable nanofabrication method for industrial applications. Further, the effectiveness of the fabricated SiC nanoporous structure for application in photoelectrochemical water splitting is demonstrated. 相似文献