全文获取类型
收费全文 | 128篇 |
免费 | 1篇 |
专业分类
化学工业 | 43篇 |
金属工艺 | 1篇 |
机械仪表 | 5篇 |
建筑科学 | 10篇 |
能源动力 | 1篇 |
轻工业 | 22篇 |
水利工程 | 2篇 |
无线电 | 8篇 |
一般工业技术 | 13篇 |
冶金工业 | 7篇 |
原子能技术 | 1篇 |
自动化技术 | 16篇 |
出版年
2023年 | 2篇 |
2022年 | 15篇 |
2021年 | 15篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 4篇 |
2011年 | 6篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有129条查询结果,搜索用时 15 毫秒
41.
Juliette Lomge Claire Negrell Jean‐Jacques Robin Vincent Lapinte Sylvain Caillol 《Polymer Engineering and Science》2019,59(Z1):E164-E170
This work described the design of an efficient oleic‐acid based viscosity control additive for lubricating oils as potential alternative to petroleum poly(alkyl)methacrylates (PAMAs) additives. Hence, Poly(2‐(methacryloyloxy)ethyl oleate) (PMAEO) was synthesized by free radical homopolymerization to afford a comb‐like polymer structure similar to common PAMAs. Then, in order to evaluate its efficiency as viscosity control additive, the resulting polymer was mixed at several concentrations from 1%wt to 10%wt with different oil compositions, including a mineral paraffinic oil (MPO) and an organic triglyceride oil (OTO). For all polymer‐solution blends, relative viscosities (RV) measurements showed that addition of PMAEO in MPO had a better contribution on oil viscosity at 100°C than at 20°C (RV = 1.16 at 40°C while RV = 1.25 for 3%wt of PMAEO in MPO). These results were attributed to the coil expansion of polymer chains with increasing temperature. Additionally, rheological studies showed that addition of 3%wt of PMAEO in MPO improved the MPO cold flow properties at ?30°C by decreasing the required yield stress to put the oil in motion from 310 mPa to 42 mPa. These results are in total accordance with the common viscosimetric properties of PAMAs‐based viscosity control additives at low and high temperature in mineral oils. POLYM. ENG. SCI., 59:E164–E170, 2019. © 2018 Society of Plastics Engineers 相似文献
42.
Juliette Lomège Claire Negrell Jean-Jacques Robin Vincent Lapinte Sylvain Caillol 《Journal of the American Oil Chemists' Society》2020,97(3):309-318
This work describes the synthesis of alkyl sulfur-functionalized polymethacrylate-based Viscosity Index Improvers (VII) derived from oleic acid (OLA) for mineral paraffinic lubricating oils. In this strategy, OLA was first quantitatively ramified by alkyl thiols containing long aliphatic chains through thiol-ene coupling as demonstrated by 1H NMR spectroscopy with the complete consumption of OLA internal double bonds. The resulting alkyl sulfur-functionalized OLA-based derivatives were methacrylated through Steglich esterification in order to afford highly suitable hydrophobic OLA-based monomers which, as far as we know, have not been described yet in the current literature. High polymethacrylate molecular weights were reached through radical polymerization despite the long alkyl pendant chains contained in their backbones. Finally, the resulting alkyl sulfur-functionalized OLA-based polymethacrylates have been blended in a mineral paraffinic oil (MPO) of reference at 5 wt% and evaluated as VII. Rheological measurements revealed that polymer thickening powers were significantly improved in oil with temperature and promoted by increasing the pendant alkyl thiol contained in polymer backbones. Moreover, the viscosity index of MPO was significantly improved with the addition of both synthesized homopolymers which confirmed their efficiency as VII. In the meantime, these results have been compared with a previously reported polymer, the poly(2-[methacryloyloxy]ethyl oleate) (PMAEO), which demonstrated a lower VII efficiency compared with its analogous polymethacrylates containing an additional alkyl chain in their pendant chains. 相似文献
43.
44.
Guillaume Ne Gilles Chtel-Innocenti Patrice Meimoun Juliette Leymarie Franoise Montrichard Pascale Satour Christophe Bailly Emmanuelle Issakidis-Bourguet 《International journal of molecular sciences》2021,22(19)
In Arabidopsis seeds, ROS have been shown to be enabling actors of cellular signaling pathways promoting germination, but their accumulation under stress conditions or during aging leads to a decrease in the ability to germinate. Previous biochemical work revealed that a specific class of plastid thioredoxins (Trxs), the y-type Trxs, can fulfill antioxidant functions. Among the ten plastidial Trx isoforms identified in Arabidopsis, Trx y1 mRNA is the most abundant in dry seeds. We hypothesized that Trx y1 and Trx y2 would play an important role in seed physiology as antioxidants. Using reverse genetics, we found important changes in the corresponding Arabidopsis mutant seeds. They display remarkable traits such as increased longevity and higher and faster germination in conditions of reduced water availability or oxidative stress. These phenotypes suggest that Trxs y do not play an antioxidant role in seeds, as further evidenced by no changes in global ROS contents and protein redox status found in the corresponding mutant seeds. Instead, we provide evidence that marker genes of ABA and GAs pathways are perturbed in mutant seeds, together with their sensitivity to specific hormone inhibitors. Altogether, our results suggest that Trxs y function in Arabidopsis seeds is not linked to their previously identified antioxidant roles and reveal a new role for plastid Trxs linked to hormone regulation. 相似文献
45.
Lotte E. van der Meeren Juliette Krop Kyra L. Dijkstra Kitty W. M. Bloemenkamp Emily F. Cornish Peter G. J. Nikkels Marie-Louise P. van der Hoorn Manon Bos 《International journal of molecular sciences》2021,22(9)
Chronic intervillositis of unknown etiology (CIUE) is a rare, poorly understood, histopathological diagnosis of the placenta that is frequently accompanied by adverse pregnancy outcomes including miscarriage, fetal growth restriction, and intrauterine fetal death. CIUE is thought to have an immunologically driven pathophysiology and may be related to human leukocyte antigen mismatches between the mother and the fetus. Dizygotic twins with one-sided CIUE provide an interesting context to study the influence of immunogenetic differences in such cases. The main immune-cell subsets were investigated using immunohistochemistry. We identified three dizygotic twin pregnancies in which CIUE was present in only one of the two placentas. Two of the pregnancies ended in term delivery and one ended in preterm delivery. Presence of CIUE was correlated with lower placental weight and lower birthweight. Relative number of CD68, CD56, CD20, and CD3 positive cells were comparable between co-twins. The presence of one-sided CIUE in dizygotic twin pregnancy was associated with selective growth restriction in the affected twin. This suggests a unique fetal immunogenetic contribution to the pathogenesis of CIUE. Further study of dizygotic and monozygotic placentas affected by CIUE could identify new insights into its pathophysiology and into the field of reproductive immunology. 相似文献
46.
Milena Lama Francisco M. Fernandes Alba Marcellan Juliette Peltzer Marina Trouillas Sbastien Banzet Marion Grosbot Clment Sanchez Marie‐Madeleine Giraud‐Guille Jean‐Jacques Lataillade Bernard Coulomb Cdric Boissire Nadine Nassif 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(4)
Extracellular matrices (ECM) rich in type I collagen exhibit characteristic anisotropic ultrastructures. Nevertheless, working in vitro with this biomacromolecule remains challenging. When processed, denaturation of the collagen molecule is easily induced in vitro avoiding proper fibril self‐assembly and further hierarchical order. Here, an innovative approach enables the production of highly concentrated injectable collagen microparticles, based on collagen molecules self‐assembly, thanks to the use of spray‐drying process. The versatility of the process is shown by performing encapsulation of secretion products of gingival mesenchymal stem cells (gMSCs), which are chosen as a bioactive therapeutic product for their potential efficiency in stimulating the regeneration of a damaged ECM. The injection of collagen microparticles in a cell culture medium results in a locally organized fibrillar matrix. The efficiency of this approach for making easily handleable collagen microparticles for encapsulation and injection opens perspectives in active tissue regeneration and 3D bioprinted scaffolds. 相似文献
47.
Simon A. Rushworth Juliette R. Brown David J. Houlton Anthony C. Jones Victoria Roberts John S. Roberts Gary W. Critchlow 《Advanced functional materials》1996,6(3):119-126
Two alternative precursor systems have been investigated for the growth of AlN and GaN by MOCVD. The first involved the reaction between Me3M (M(DOUBLE BOND)Al, Ga) and tert-butylamine (tBuNH2), whilst the second route involved the pyrolysis of single-source precursors such as Me3M(NH3) (M(DOUBLE BOND)Al, Ga) and [Me2Ga(NH2)]3. Both routes proved suitable for the deposition of AlN thin films, and epitaxial AlN layers have been deposited on sapphire (0001) from Me3Al(NH3) without any added NH3. Attempts to grow GaN from Me3Ga/tBuNH2 mixtures or Me3Ga(NH3) were unsuccessful, leading to the deposition of Ga droplets, although GaN films containing a large excess of Ga were deposited by low-pressure MOCVD from the single-source precursor [Me2Ga(NH2)]3. 相似文献
48.
Roddy Juliette; Steinmiller Caren L.; Greenwald Mark K. 《Canadian Metallurgical Quarterly》2011,25(2):358
Semi-structured interviews were used to assess behavioral economic drug demand in heroin dependent research volunteers. Findings on drug price, competing purchases, and past 30-day income and consumption, established in a previous study, are replicated. We extended these findings by having participants indicate whether hypothetical environmental changes would alter heroin purchasing. Participants (n = 109) reported they would significantly (p 相似文献
49.
Jean -Louis Oudar Guy Aubin Juliette Mangeney Slimane Loualiche Jean -Claude Simon Alexandre Shen Olivier Leclerc 《电信纪事》2003,58(11-12):1667-1707
We review recent advances in the investigation of vertical cavity saturable absorber devices and their use for the all-optical regeneration of telecommunication signals in ultra-long-haul transmission systems. Such devices are polarization-insensitive and operate as fully passive nonlinear optical elements. Two approaches for obtaining fast recovery absorber materials are described, relying upon ion irradiation or upon iron doping. The vertical micro-cavity devices are designed so as to optimize the switching contrast and the operating power. Their functional behaviour as extinction ratio amplifiers has been characterized and their optimal operating conditions have been determined. The potential application of these devices to all-optical regeneration has been investigated through numerical simulations and fully demonstrated in several long-distance transmission loop experiments, with results obtained at 10, 20 and 40 Gbit/s, showing significant improvements in system haul or operational margins. A four-channel fibered module has also been fabricated, as a perspective towards the development of wavelength division multiplexing (WDM) saturable absorber modules. 相似文献
50.
Patrice Buche Juliette Dibie-Barthélemy Ollivier Haemmerlé Gaëlle Hignette 《Journal of Intelligent Information Systems》2006,26(1):25-40
The relational database model is widely used in real applications. We propose a way of complementing such a database with
an XML data warehouse. The approach we propose is generic, and driven by a domain ontology. The XML data warehouse is built
from data extracted from the Web, which are semantically tagged using terms belonging to the domain ontology. The semantic
tagging is fuzzy, since, instead of tagging the values of the Web document with one value of the domain ontology, we propose
to use tags expressed in terms of a possibility distribution representing a set of possible terms, each term being weighted
by a possibility degree. The querying of the XML data warehouse is also fuzzy: the end-users can express their preferences
by means of fuzzy selection criteria. We present our approach on a first application domain: predictive microbiology. 相似文献