全文获取类型
收费全文 | 868篇 |
免费 | 83篇 |
国内免费 | 53篇 |
专业分类
化学 | 421篇 |
晶体学 | 4篇 |
力学 | 31篇 |
综合类 | 10篇 |
数学 | 7篇 |
物理学 | 130篇 |
综合类 | 401篇 |
出版年
2024年 | 10篇 |
2023年 | 22篇 |
2022年 | 37篇 |
2021年 | 46篇 |
2020年 | 73篇 |
2019年 | 44篇 |
2018年 | 41篇 |
2017年 | 65篇 |
2016年 | 37篇 |
2015年 | 28篇 |
2014年 | 41篇 |
2013年 | 42篇 |
2012年 | 35篇 |
2011年 | 44篇 |
2010年 | 25篇 |
2009年 | 36篇 |
2008年 | 33篇 |
2007年 | 46篇 |
2006年 | 41篇 |
2005年 | 39篇 |
2004年 | 37篇 |
2003年 | 28篇 |
2002年 | 15篇 |
2001年 | 19篇 |
2000年 | 22篇 |
1999年 | 18篇 |
1998年 | 13篇 |
1997年 | 15篇 |
1996年 | 10篇 |
1995年 | 10篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1004条查询结果,搜索用时 625 毫秒
991.
为了研究非线性超声检测技术评估材料抗拉强度的可行性,对不同成型角度下的3D打印铝合金材料进行非线性超声检测和力学拉伸试验。结果表明材料的抗拉强度、微观缺陷比率和超声非线性系数三者之间有很强的相关性。随着材料微观缺陷比率增大,超声非线性系数也随之增大,而抗拉强度呈现变小的趋势,因此超声非线性系数可以评价材料的强度。此外,对不同成型角度下的3D打印铝合金试件进行疲劳试验,发现疲劳加载后试件的超声非线性系数随着微裂纹萌生而增大。因此,非线性超声检测技术可用于3D打印铝合金材料力学性能的评估和微裂纹的检测。 相似文献
992.
Alexander Kamyshny Matti Ben‐Moshe Shai Aviezer Shlomo Magdassi 《Macromolecular rapid communications》2005,26(4):281-288
Summary: Two types of ink‐jet inks are presented: ink containing an aqueous dispersion of silver nanoparticles and an oil‐in‐water microemulsion‐based ink. The metallic ink contains nanoparticles of silver, which are formed in the presence of an ionic polymeric stabilizer. Sintering of the printed image obtained with the use of such silver‐based inks at temperatures as low as 300 °C results in formation of patterns possessing noticeable conductivity. The microemulsion inks are based on a thermodynamically stable microemulsion, in which the dispersed oil phase is a volatile solvent containing a water‐insoluble colorant. After contact of the jetted ink droplets with a substrate, nanodroplets of the microemulsion are converted into nanoparticles of the solubilized colorant. In some cases, it was found that the evaporation of microemulsion ink droplets leads to formation of rings composed of ordered nanoparticles.
993.
为探究矿物掺合料在3D打印混凝土中的作用机理,研究粉煤灰(FA)、矿粉(S)、硅灰(SF)单掺和复掺对3D打印水泥基材料抗压强度、抗折强度的影响.结果表明:单掺时,打印组和模筑组力学性能的变化规律基本保持一致,粉煤灰和矿粉会降低混凝土的抗压强度和抗折强度,而硅灰则会提高混凝土的力学性能.复掺时,材料力学性能大小顺序为:S+SF>基准组>FA+SF>FA+S.此外,3D打印混凝土的抗压强度无明显各向异性,而抗折强度有明显的各向异性.打印组在x方向的抗折强度比y、z方向低25%~40%,在x、y、z方向的抗折强度比筑模组低10%~30%. 相似文献
994.
采用喷墨打印技术在疏水性相片纸表面沉积银纳米薄膜,制备了一种高效的纸质表面增强拉曼散射(SERS)基底(银纳米薄膜/相片纸),并利用接触角测量仪与扫描电子显微镜(SEM)表征相片纸书写前后的浸润性和表面形貌.通过模拟福美双在果皮表面及果汁中的残留状态,对银纳米薄膜/相片纸基底的应用潜力进行评价.研究发现,该基底可以直接识别出果汁溶液或果皮表面掺杂的福美双分子,不需作任何预处理.对掺杂福美双的果汁最低检测的质量浓度低至0.024 mg∙L-1,且特征峰强度与浓度间具有较好的线性关系;对果皮表面残留福美双分子的检测限为0.25 ng∙cm-2.此外,在吸附福美双/果汁的基底表面随机选取10个点,研究银纳米薄膜/相片纸的均匀性,经计算1 142和1 377 cm-1处的特征峰的相对标准偏差分别为7.8%和5.7%.结果表明:银纳米薄膜/相片纸在农药残留检测方面具有潜在的应用前景. 相似文献
995.
Photocurable Nitric Oxide-Releasing Copolyester for the 3D Printing of Bioresorbable Vascular Stents
Matheus F. de Oliveira Laura C. E. da Silva Daniele M. Catori Marcos V. Lorevice Karen E. A. Galvão Ana L. G. Millás Marcelo G. de Oliveira 《Macromolecular bioscience》2023,23(3):2200448
The design of bioresorbable vascular stents (BVS) capable of releasing nitric oxide (NO) at the implant site may enable BVS to mimic the antiplatelet, antiproliferative, and pro-endothelial actions of NO, overcoming complications of BVS such as late thrombosis and restenosis. In this study, the fabrication of BVS composed of methacrylated poly(dodecanediol citrate-co-dodecanediol S-nitroso-mercaptosuccinate) (mP(DC-co-DMSNO)), a novel elastomeric, bioabsorbable, and photocurable copolyester, containing covalently bound S-nitrosothiol groups in the carbon backbone of the polymer, is reported. The mP(DC-co-DMSNO) stents are manufactured via photoinduced 3D printing and allow deployment via a self-expansion process from a balloon catheter. After deployment, hydration of the stents triggers the release of NO, which is maintained during the slow hydrolysis of the polymer. Real-time NO release measurements show that by varying the copolyester composition and the strut geometry of the mP(DC-co-DMSNO) stents, it is possible to modulate their NO release rate in the range of 30–52 pmol min−1 cm−2. Preliminary biological assays in cell culture show that endothelial cells adhere to the surface of the stents and that NO release favors their endothelization. Thus, mP(DC-co-DMSNO) may emerge as a new platform for the fabrication of advanced BVS. 相似文献
996.
Tomas Drevinskas Aaron C. Noell Florian Kehl Konstantin Zamuruyev Mauro S. Ferreira Santos Maria F. Mora Travis D. Boone Trinh Hoac Richard C. Quinn Antonio J. Ricco Peter A. Willis 《Electrophoresis》2023,44(13-14):1047-1056
Capillary electrophoresis (CE) holds great promise as an in situ analytical technique for a variety of applications. However, typical instrumentation operates with open reservoirs (e.g., vials) to accommodate reagents and samples, which is problematic for automated instruments designed for space or underwater applications that may be operated in various orientations. Microgravity conditions add an additional challenge due to the unpredictable position of the headspace (air layer above the liquid) in any two-phase reservoir. One potential solution for these applications is to use a headspace-free, flow-through reservoir design that is sealed and connected to the necessary reagents and samples. Here, we demonstrate a flow-through high-voltage (HV) reservoir for CE that is compatible with automated in situ exploration needs, and which can be electrically isolated from its source fluidics (in order to prevent unwanted leakage current). We also demonstrate how the overall system can be rationally designed based on the operational parameters for CE to prevent electrolysis products generated at the electrode from entering the capillary and interfering with the CE separation. A reservoir was demonstrated with a 19 mm long, 1.8 mm inner diameter channel connecting the separation capillary and the HV electrode. Tests of these reservoirs integrated into a CE system show reproducible CE system operation with a variety of background electrolytes at voltages up to 25 kV. Rotation of the reservoirs, and the system, showed that their performance was independent of the direction of the gravity vector. 相似文献
997.
Zoltán Meiszterics András Kiss Lívia Nagy Tamás Zsebe Gyula F. Vasvári Dávid C. Csonka Géza Nagy 《Electroanalysis》2023,35(6):e202200506
The kinetics of oxide layer formation on surface of Ti6Al4V alloy samples is a very important property especially if their application as medical implants is planned. Damaged protective surface layer usually heals in ambient condition however; during the self-healing process toxic species can get into the surrounding living tissue. In our experiment the kinetics of the healing process proceeding at 3D printed alloy surface has been studied using electrochemical methods, among them scanning electrochemical microscopy. More than 40 min. time period was found long enough for total healing. 相似文献
998.
999.
Polydimethylsiloxane (PDMS) based microfluidic devices have found increasing utility for electrophoretic and electrokinetic assays because of their ease of fabrication using replica molding. However, the fabrication of high-resolution molds for replica molding still requires the resource-intensive and time-consuming photolithography process, which precludes quick design iterations and device optimization. We here demonstrate a low-cost, rapid microfabrication process, based on electrohydrodynamic jet printing (EJP), for fabricating non-sacrificial master molds for replica molding of PDMS microfluidic devices. The method is based on the precise deposition of an electrically stretched polymeric solution of polycaprolactone in acetic acid on a silicon wafer placed on a computer-controlled motion stage. This process offers the high-resolution (order 10 m) capability of photolithography and rapid prototyping capability of inkjet printing to print high-resolution templates for elastomeric microfluidic devices within a few minutes. Through proper selection of the operating parameters such as solution flow rate, applied electric field, and stage speed, we demonstrate microfabrication of intricate master molds and corresponding PDMS microfluidic devices for electrokinetic applications. We demonstrate the utility of the fabricated PDMS microchips for nonlinear electrokinetic processes such as electrokinetic instability and controlled sample splitting in ITP. The ability to rapid prototype customized reusable master molds with order 10 m resolution within a few minutes can help in designing and optimizing microfluidic devices for various electrokinetic applications. 相似文献
1000.
Naroa Lopez-Larrea Antonela Gallastegui Luis Lezama Miryam Criado-Gonzalez Nerea Casado David Mecerreyes 《Macromolecular rapid communications》2024,45(1):2300229
Functional inks for light-based 3D printing are actively being searched for being able to exploit all the potentialities of additive manufacturing. Herein, a fast visible-light photopolymerization process is showed of conductive PEDOT:PSS hydrogels. For this purpose, a new Type II photoinitiator system (PIS) based on riboflavin (Rf), triethanolamine (TEA), and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is investigated for the visible light photopolymerization of acrylic monomers. PEDOT:PSS has a dual role by accelerating the photoinitiation process and providing conductivity to the obtained hydrogels. Using this PIS, full monomer conversion is achieved in less than 2 min using visible light. First, the PIS mechanism is studied, proposing that electron transfer between the triplet excited state of the dye (3Rf*) and the amine (TEA) is catalyzed by PEDOT:PSS. Second, a series of poly(2-hydroxyethyl acrylate)/PEDOT:PSS hydrogels with different compositions are obtained by photopolymerization. The presence of PEDOT:PSS negatively influences the swelling properties of hydrogels, but significantly increases its mechanical modulus and electrical properties. The new PIS is also tested for 3D printing in a commercially available Digital Light Processing (DLP) 3D printer (405 nm wavelength), obtaining high resolution and 500 µm hole size conductive scaffolds. 相似文献