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991.
992.
基于Sagnac干涉原理的全光纤光电互感器具有响应特性好、精度高、安全性好的特性,是解决脉动电流测量的新技术之一。以J21-40T普通冲床为研究对象,应用光波的偏振性和法拉第磁光效应理论,探究了全光纤光电互感器测量冲床脉动电流的工作机理。通过对Sagnac调制技术的全面分析,设计了系统框图。借助测量数据,阐述了测量重复性、温度变化、1/4波片、Verdet常数误差。研究结果表明:这一技术可以普遍用于冲床脉动电流的准确测量,是一种有效的大电流计量技术。 相似文献
993.
Anisotropy in Shape and Ligand‐Conjugation of Hybrid Nanoparticulates Manipulates the Mode of Bio–Nano Interaction and Its Outcome 下载免费PDF全文
Xiaoyou Wang Li Lin Renfa Liu Min Chen Binlong Chen Bo He Bing He Xiaolong Liang Wenbing Dai Hua Zhang Xueqing Wang Yiguang Wang Zhifei Dai Qiang Zhang 《Advanced functional materials》2017,27(31)
In an attempt to manipulate the biological features of nanomaterials via both anisotropic shape and ligand modification, four types of nanoparticulates with good morphological stability are designed and engineered, including hybrid nanospheres, nanodiscs, and nanodiscs with edge modification or plane modification of octa‐arginine (R8) sequence. It is found that the R8 modification anisotropy can trigger huge differences in the endocytosis, intracellular trafficking, and even tissue penetration of nanoparticulates. From plane modification to edge modification of R8, the maximum increase in cell uptake is up to 17‐fold, which is much more significant than shape anisotropy alone. On the other hand, six types of different cell lines are investigated to simulate biological microenvironment. It is demonstrated that the maximum difference in cell uptake among six cell lines is 12‐fold. Three main driving forces are found to contribute to such bio–nano interactions. Based on the findings of this study, it seems possible to manipulate the biointeraction mode of nanomaterials and its output by regulating their anisotropy in both shape and ligand modification. 相似文献
994.
为进一步提高神光-Ⅲ原型装置8束三倍频激光焦斑的能量集中度,需要对神光-Ⅲ原型装置的全光路系统波前进行校正。其中的关键技术之一就是要准确获得全光路系统的波前畸变。神光-Ⅲ原型装置的8束激光主放诊断包内均配置了一套哈特曼波前传感器,可以较为方便地获得主放大系统输出波前,但却无法直接获得靶场系统波前。解决方法主要有逆向标定和靶点直接测量两种,通过比较两种方法的技术复杂性、测量准确性等指标,结合对校正前后远场焦斑的测量,最终确定采用靶点直接测量的方法能简单、有效地获得全光路系统波前畸变。 相似文献
995.
摘要:提出了一种采用片上电荷泵自动调谐结构的MOSFET-C非对称带通滤波器的设计方案,并在UMC(联合电子公司)0.18um标准CMOS工艺线上流片得到验证。带有调谐系统的滤波器采用主从技术进行连续调谐,完成调谐功能后电荷泵输出调谐电压为2.663V,远高于电源电压,提高了滤波器的线性度。非对称带通滤波器带宽为(2.73MHz,5.34MHz)且具有3阶低通和2阶高通特性。以50欧姆作为源阻抗,滤波器带内3阶交调量(IIP3)为16.621dBm。输入参考噪声为47.455uVrms。在1.8V电源电压下,主滤波器功耗为3.528mW,自动调谐电路功耗为2.412mW。带有自动调谐系统的滤波器整个系统占芯片面积0.592mm2,可用于无线局域网,全球定位和蓝牙等系统中。 相似文献
996.
Hao‐Bo Jiang Yong‐Lai Zhang Dong‐Dong Han Hong Xia Jing Feng Qi‐Dai Chen Zi‐Ruo Hong Hong‐Bo Sun 《Advanced functional materials》2014,24(29):4595-4602
Reported here is a bioinspired fabrication of superhydrophobic graphene surfaces by means of two‐beam laser interference (TBLI) treatment of graphene oxide (GO) films. Microscale grating‐like structures with tunable periods and additional nanoscale roughness are readily created on graphene films due to laser induced ablation effect. Synchronously, abundant hydrophilic oxygen‐containing groups (OCGs) on GO sheets can be drastically removed after TBLI treatment, which lower its surface energy significantly. The synergistic effect of micro‐nanostructuring and the OCGs removal endows the resultant graphene films with unique superhydrophobicity. Additionally, dual TBLI treatment with 90° rotation is implemented to fabricate superhydrophobic graphene films with two‐dimensional grating‐like structures that can effectively avoid the anisotropic hydrophobicity originated from the grooved structures. Moreover, the superhydrophobic graphene films become conductive due to the laser reduction effect. Unique optical characteristics including transmission diffraction and brilliant structural color are also observed due to the presence of periodic microstructures. As a mask‐free, chemical‐free, and cost‐effective method, the TBLI processing of GO may open up a new way to biomimetic graphene surfaces, and thus hold great promise for the development of novel graphene‐based microdevices. 相似文献
997.
Manipulable and Hybridized,Ultralow‐Threshold Lasing in a Plasmonic Laser Using Elliptical InGaN/GaN Nanorods 下载免费PDF全文
Tao Tao Ting Zhi Bin Liu Jiangping Dai Zhe Zhuang Zili Xie Peng Chen Fangfang Ren Dunjun Chen Youdou Zheng Rong Zhang 《Advanced functional materials》2017,27(37)
Manipulating stimulated‐emission light in nanophotonic devices on scales smaller than their emission wavelengths to meet the requirements for optoelectronic integrations is a challenging but important step. Surface plasmon polaritons (SPPs) are one of the most promising candidates for sub‐wavelength optical confinement. In this study, based on the principle of surface plasmon amplification by the stimulated emission of radiation (SPASER), III‐Nitride‐based plasmonic nanolaser with hybrid metal–oxide–semiconductor (MOS) structures is designed. Using geometrically elliptical nanostructures fabricated by nanoimprint lithography, elliptical nanolasers able to demonstrate single‐mode and multimode lasing with an optical pumping power density as low as 0.3 kW cm?2 at room temperature and a quality Q factor of up to 123 at a wavelength of ≈490 nm are achieved. The ultralow lasing threshold is attributed to the SPP‐coupling‐induced strong electric‐field‐confinement in the elliptical MOS structures. In accordance with the theoretical and experimental results, the size and shape of the nanorod are the keys for manipulating hybridization of the plasmonic and photonic lasing modes in the SPASER. This finding provides innovative insight that will contribute to realizing a new generation of optoelectronic and information devices. 相似文献
998.
999.
Perovskite Solar Cells: All‐Carbon‐Electrode‐Based Endurable Flexible Perovskite Solar Cells (Adv. Funct. Mater. 11/2018) 下载免费PDF全文
1000.
为进一步揭示硫系玻璃基掺Er3+微结构光纤作为中红外光纤放大器增益介质的可行性,数值求解了800 nm泵浦波长下Ga5Ge20Sb10S65硫系玻璃基掺Er3+微结构光纤中Er3+离子数速率方程和光功率传输方程组,理论研究了4.5μm波段中红外信号的放大特性。结果显示,Ga5Ge20Sb10S65硫系玻璃基掺Er3+微结构光纤具有较高的信号增益和很宽的增益谱。在50 cm光纤长度上,最大信号增益超过了40 dB,高于30 dB信号增益的放大带宽达到了280 nm(4 420~4 700 nm)。同时,进一步研究分析了4 500 nm波长信号增益与光纤长度、信号输入功率和泵浦功率的关系。研究表明,Ga5Ge20Sb10S65硫系玻璃基掺Er3+微结构光纤是一种理想的可应用于4.5μm波段中红外宽带放大器的增益介质。 相似文献