全文获取类型
| 收费全文 | 2609篇 |
| 免费 | 49篇 |
| 国内免费 | 15篇 |
专业分类
| 电工技术 | 31篇 |
| 综合类 | 12篇 |
| 化学工业 | 591篇 |
| 金属工艺 | 72篇 |
| 机械仪表 | 92篇 |
| 建筑科学 | 81篇 |
| 矿业工程 | 8篇 |
| 能源动力 | 217篇 |
| 轻工业 | 403篇 |
| 水利工程 | 20篇 |
| 石油天然气 | 25篇 |
| 无线电 | 165篇 |
| 一般工业技术 | 511篇 |
| 冶金工业 | 90篇 |
| 原子能技术 | 35篇 |
| 自动化技术 | 320篇 |
出版年
| 2024年 | 46篇 |
| 2023年 | 54篇 |
| 2022年 | 88篇 |
| 2021年 | 124篇 |
| 2020年 | 111篇 |
| 2019年 | 110篇 |
| 2018年 | 139篇 |
| 2017年 | 129篇 |
| 2016年 | 122篇 |
| 2015年 | 80篇 |
| 2014年 | 93篇 |
| 2013年 | 237篇 |
| 2012年 | 151篇 |
| 2011年 | 158篇 |
| 2010年 | 115篇 |
| 2009年 | 152篇 |
| 2008年 | 156篇 |
| 2007年 | 117篇 |
| 2006年 | 82篇 |
| 2005年 | 61篇 |
| 2004年 | 44篇 |
| 2003年 | 42篇 |
| 2002年 | 24篇 |
| 2001年 | 15篇 |
| 2000年 | 18篇 |
| 1999年 | 17篇 |
| 1998年 | 30篇 |
| 1997年 | 17篇 |
| 1996年 | 9篇 |
| 1995年 | 5篇 |
| 1994年 | 7篇 |
| 1993年 | 12篇 |
| 1992年 | 15篇 |
| 1991年 | 11篇 |
| 1990年 | 8篇 |
| 1989年 | 6篇 |
| 1988年 | 5篇 |
| 1987年 | 7篇 |
| 1986年 | 10篇 |
| 1985年 | 7篇 |
| 1984年 | 6篇 |
| 1983年 | 3篇 |
| 1982年 | 4篇 |
| 1981年 | 6篇 |
| 1979年 | 3篇 |
| 1976年 | 4篇 |
| 1971年 | 1篇 |
| 1970年 | 3篇 |
| 1968年 | 1篇 |
| 1967年 | 3篇 |
排序方式： 共有2673条查询结果，搜索用时 15 毫秒
41.
Khaled H. Ibrahim Mehrdad Irannejad Mojtaba Hajialamdari Ali Ramadhan Kevin P. Musselman Joseph Sanderson Mustafa Yavuz 《Advanced Materials Interfaces》2016,3(14)
Graphene and its functionalized derivatives are unique and multifaceted novel materials with a wide range of applications in chemistry, healthcare, and optoelectronic engineering. 3D graphene materials exhibit several advantages over 2D (monolayer) graphene for a variety of devices applications. Here a novel and effective room temperature technique is introduced to convert an aqueous graphene oxide solution into a reduced graphene oxide gel with tunable physical and chemical properties comparable to a monolayer graphene sheet, without the need for any additives or chemical agents. The femtogel is synthesized by exposing an ultrahigh concentration graphene oxide solution with single‐layer flakes to high intensity femtosecond laser pulses. The femtosecond laser beam is focused on the air/aqueous solution interface to enhance the vaporization of functional groups and water, enabling femtogel formation. By controlling the pulsed laser intensity, beam focal parameters, and pulse duration, it is possible to produce several milliliters of femtogel in as little as 8 min. Through initial optimization of the irradiation parameters, a thin film is produced from a femtogel that demonstrates a surface roughness less than 6 nm, and more than 95% reduction in OH absorbance, as compared to a thin film produced from the unexposed graphene oxide solution. 相似文献
42.
Noha I. A. Mutwali Abdelmoniem I. Mustafa Yasir S. A. Gorafi Isam A. Mohamed Ahmed 《Food Science & Nutrition》2016,4(4):508-520
To meet the increased demand for wheat consumption, wheat cultivation in Sudan expanded southward to latitudes lower than 15°N, entering a new and warmer environment. Consequently, wheat breeders developed several wheat genotypes with high yields under these environmental conditions; however, the evaluation of the end‐use quality of these genotypes is scarce. In this study, we assessed the end‐use quality attributes of 20 wheat genotypes grown in three different environments in the Sudan (Wad Medani, Hudeiba, and Dongola). The results showed significant differences (P ≤ 0.01) in all quality tests among environments, genotypes and genotypes Versus environments. The findings obtained, covered wide ranges of test weight (TW, 76.6–85.25 kg/hL), thousand kernel weight (TKW, 28.70–48.48 g), protein (PC, 9.96–14.06%), wet gluten (WG, 28.63–46.53%), gluten index (GI, 36.36–92.77%), water holding capacity (WHC, 168.42–219.32%), falling number (FN, 508.00–974.67 sec), and sedimentation value (SV, 19.00–40.00 mL). Analysis of the traits, genotypes, and traits versus genotypes showed varied correlations in the three growing environments. The genotype G3 grown in either one or all of the three environments exhibits worthy performance and stability for most of the tested quality traits. The crossing of this genotype with high yield genotypes could produce cultivars with sufficient quality and marketability. 相似文献
43.
44.
45.
Developing complex supramolecular biomaterials through highly dynamic and reversible noncovalent interactions has attracted great attention from the scientific community aiming key biomedical and biotechnological applications, including tissue engineering, regenerative medicine, or drug delivery. In this study, the authors report the fabrication of hybrid supramolecular multilayered biomaterials, comprising high‐molecular‐weight biopolymers and oppositely charged low‐molecular‐weight peptide amphiphiles (PAs), through combination of self‐assembly and electrostatically driven layer‐by‐layer (LbL) assembly approach. Alginate, an anionic polysaccharide, is used to trigger the self‐assembling capability of positively charged PA and formation of 1D nanofiber networks. The LbL technology is further used to fabricate supramolecular multilayered biomaterials by repeating the alternate deposition of both molecules. The fabrication process is monitored by quartz crystal microbalance, revealing that both materials can be successfully combined to conceive stable supramolecular systems. The morphological properties of the systems are studied by advanced microscopy techniques, revealing the nanostructured dimensions and 1D nanofibrous network of the assembly formed by the two molecules. Enhanced C2C12 cell adhesion, proliferation, and differentiation are observed on nanostructures having PA as outermost layer. Such supramolecular biomaterials demonstrate to be innovative matrices for cell culture and hold great potential to be used in the near future as promising biomimetic supramolecular nanoplatforms for practical applications. 相似文献
46.
Serap Kılıç Altun;Mehmet Emin Aydemir;Kasım Takım;Mustafa Abdullah Yilmaz; 《Food Science & Nutrition》2024,12(9):6298-6314
The objective of this study was to assess the impact of marinating beef, chicken, and fish with Micromeria fruticosa (M. fruticosa) on the inhibition of Nε-(carboxyethyl)lysine (CEL) and Nε-(carboxymethyl)lysine (CML). Furthermore, our objective was to examine how different cooking techniques, temperatures, and durations affect the creation of CEL and CML in these meat products. The study began with the characterization of M. fruticosa. Subsequently, meat samples were marinated using an M. fruticosa-containing marinade and stored at 4 ± 1°C for 24 h. Following storage, the meats underwent cooking in an oven at 200°C for 12 min and in an air fryer at 250°C for 8 min. Subsequently, pH, color, thiobarbituric acid reactive substances (TBARS), as well as CEL and CML analyses were conducted. M. fruticosa had high levels of biological activity and bioactive content. Moreover, increasing the M. fruticosa ratio in the marinade demonstrated a reduction in TBARS, CML, and CEL formation. This study concludes that M. fruticosa can be effectively used as a marinade component for meat, inhibiting the formation of CEL and CML. In conclusion, this research underscores the significant potential of M. fruticosa in reducing the synthesis of advanced glycation end products (AGEs) during meat processing. These results not only enhance our comprehension of the complex relationship between plant extracts and meat quality but also present encouraging prospects for fostering healthier and safer cooking methods. 相似文献
47.
Erhan Cebeci;Ertan Katirci;Mustafa Karhan;Emin Turkay Korgun; 《Food Science & Nutrition》2024,12(10):7581-7590
Stevia rebaudiana Bertoni, which is a medicinal plant used in the treatment of diabetes, was the focus of this study aiming to investigate its immunomodulatory properties in diabetes. To form the diabetes group, rats were injected intraperitoneally with STZ and rats with blood glucose levels above 200 mg/dL 2 days after STZ injection were included in the diabetes group. To form the stevia and diabetes + stevia groups, stevia was administered daily by gavage to both healthy and diabetic rats for 28 days. At the end of 28 days, the levels of interleukin-1 beta and tumor necrosis factor-alpha in the blood were measured by ELISA. CD3, CD4, and CD8 protein levels in the blood were determined by flow cytometry. Rat body weight increased in the diabetes +25 mg/kg bW stevia group compared with the diabetes group. Blood glucose levels were significantly decreased in the diabetes +25 mg/kg bW stevia group compared to the diabetes group (**p < .01). IL-1β cytokine levels decreased significantly in the diabetes +25 mg/kg bW stevia group compared to the diabetes group (**p < .01). TNF-α cytokine levels decreased significantly in the diabetes +25 mg/kg bW stevia group compared to the diabetes group (**p < .01). The amount of CD8 + T cells decreased significantly in the diabetes +25 mg/kg bW stevia group compared to the diabetes group (*p < .05). The stevia diet leads to a reduction in peripheral circulating cytotoxic T cells and proinflammatory cytokines interleukin-1 beta and tumor necrosis factor-alpha under hyperglycemic conditions. 相似文献
48.
Mutlu Tuçe Ülker;Gözde Arıtıcı Çolak;Murat Baş;Mustafa Genco Erdem; 《Food Science & Nutrition》2024,12(2):1180-1188
Hashimoto's thyroiditis is an autoimmune disease in which thyroid cells are attacked through cell-and antibody-mediated immune processes. A gluten-free diet reduces antibody concentration and regulates thyroid autoimmunization. Mediterranean diet reduces oxidative stress. This study evaluates the short-term effects of Mediterranean, gluten-free, and Mediterranean gluten-free dietary patterns on thyroid function and autoantibody levels of patients. The 40 patients with Hashimoto's thyroiditis included in the study were randomly divided into four groups (defined as gluten-free, Mediterranean, Mediterranean gluten-free, and controls) for 12 weeks. Thyroid function tests, autoantibody levels, and food consumption were recorded at the beginning and end of the study. There was no statistically significant difference in TSH levels of the groups before the intervention, but a statistically significant difference was found afterward (p < 0.05). Free T3 hormone levels showed a statistically significant difference across the groups before and after the intervention (p < 0.05). Free T3 hormone levels increased significantly in all intervention groups after the intervention, with the highest increase in the Mediterranean group (p < 0.05). In the intervention groups, anti-TPO and anti-Tg levels decreased after the intervention; however, this difference was not significant across groups (p > 0.05). In addition, body weight, body mass index, waist and hip circumference averages decreased significantly in all intervention groups compared with controls (p < 0.05). The study achieved an increase in Free T3 hormone levels in the intervention groups. The most marked difference was seen in the Mediterranean gluten-free diet model, which may be due to the anti-inflammatory effect of both Mediterranean and gluten-free diets and the loss of body weight as a result of the intervention. 相似文献
49.
Muhammed Mustafa Ozcelik;Sedef Aydin;Ebru Aydin;Gulcan Ozkan; 《Food Science & Nutrition》2024,12(2):1340-1355
Red cabbage, a highly nutritious cool-season cruciferous vegetable, is rich in anthocyanins; however, the instability of anthocyanins during processing and storage poses challenges. This study aimed to optimize the foam-mat drying process of red cabbage juice (RCJ) with a high anthocyanin content using a hybrid microwave hot air-drying system (MW-HAD) as a dehydration method compared to conventional techniques (HAD) using response surface methodology (RSM). Additionally, the produced red cabbage juice powder (RCJP) was used to enrich the pancake formulation. The developed model exhibited a high degree of reliability with optimal conditions and was determined for microwave power, temperature, foaming agent carboxymethylcellulose (CMC), and egg white protein (EWP) as 360 W, 60°C, 0.3%, and 1.2%, respectively. Moisture content (%) was decreased from 93.47 to 8.62 at optimum process conditions. In comparison to the control (60°C), foam mat drying with the MW-HAD hybrid system reduced the drying time (DT) by more than 90.9% due to the higher drying rate, while many physicochemical properties, especially total anthocyanin content (TAC), were better preserved. Utilization of RCJP in the production of anthocyanin-rich functional pancakes resulted in enhanced nutritional qualities compared to control pancakes with increased protein (35.07%), total phenolic (75.8%), dietary fiber (82.9%), and anthocyanin content (100%). In conclusion, MW-HAD demonstrates significant potential as a promising drying method to reduce the DT and preserve the physicochemical properties of RCJP. Furthermore, the application of the optimized RCJP in anthocyanin-rich functional pancakes highlights improved nutritional qualities, making a substantial contribution to the advancement of functional foods. 相似文献
50.
TiO_2 nanotubes on Ti metal surface were prepared by the electrochemical anodization method. Then, nanosilver was deposited onto the nanotubes by the electroless dip coating and the anodization. The obtained TiO2 nanotubes were examined by using scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, cyclic voltammetry, and UV–Vis. The electrochemical band gap(E_g~(CV)) of the nanosilver-coated TiO_2 nanotubes prepared by the anodization was found as 1.54 eV. Using the UV–Vis measurements, the optical band gap energy(E_g~(op).) was calculated as 1.51 eV for the Ag/TiO_2 nanotubes obtained by electroless dip coating. The electrical conductivity of the TiO_2 nanotubes also increased from 3.0 9 10-4 to 34.7 S/cm after nano Ag deposition by the anodization method.These Ag/TiO_2 nanotubes with low band gap and high electrical conductivity are desirable for the applications in electronics, Li-ion batteries, and solar cells. 相似文献