全文获取类型
收费全文 | 238篇 |
免费 | 34篇 |
国内免费 | 1篇 |
专业分类
综合类 | 2篇 |
化学工业 | 38篇 |
机械仪表 | 1篇 |
建筑科学 | 7篇 |
能源动力 | 3篇 |
轻工业 | 217篇 |
无线电 | 1篇 |
一般工业技术 | 2篇 |
冶金工业 | 1篇 |
自动化技术 | 1篇 |
出版年
2024年 | 4篇 |
2023年 | 5篇 |
2022年 | 17篇 |
2021年 | 11篇 |
2020年 | 8篇 |
2019年 | 14篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 7篇 |
2015年 | 9篇 |
2014年 | 13篇 |
2013年 | 15篇 |
2012年 | 11篇 |
2011年 | 28篇 |
2010年 | 10篇 |
2009年 | 21篇 |
2008年 | 10篇 |
2007年 | 11篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 10篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1987年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有273条查询结果,搜索用时 15 毫秒
81.
原桃胶和商品桃胶的生产与应用 总被引:10,自引:0,他引:10
本文讨论了原桃胶和商品桃胶的生产与应用,并提出了存在的问题。 相似文献
82.
83.
The content and relative amounts of anthocyanins and hydroxycinnamic acids (HCA) were determined in local sweet cherries (cultivar Petrovka) at 7 stages of maturity, by means of high performance liquid chromatography (HPLC), and compared to instrumentally assessed skin colour of the same sweet cherries. Skin colour of harvested samples was measured using the CIE L*,a*,b* system. The contents of neochlorogenic and 3′-p-coumarylquinnic acids decreased with no significant change in ratio during ripening, except for the first 4 days of maturation, when the ratio changed due to increased content of neochlorogenic acid. The linear increase of total anthocyanins during maturation was observed without the trend of stabilization in the final stages of maturity. The colour change of Petrovka during maturation was influenced by the increase of total anthocyanins, consisting mostly of cyanidin-3-rutinoside and cyanidin-3-glucoside (97-98% of the total). The chroma and L* values appeared to be optimal indicators of anthocyanin accumulation during maturation, and better than the a* value and hue angle. The accumulation of anthocyanins from 507.1 to 1150.9 mg of cyanidin-3-rutinoside/kg of fresh weight (FW) during the second half of maturation caused the formation of a new colour cast of Petrovka, which influenced the decrease of redness and colour intensity, as recognized by CIE L*,a*,b* colour space. 相似文献
84.
85.
86.
Ioannis Kazantzis George D Nanos George G Stavroulakis 《Journal of the science of food and agriculture》2003,83(4):354-359
The effect of storage for 6 months at 5 °C (80% RH) versus 20 °C (60% RH) of shelled versus in‐shell almonds was studied on early versus late harvested nuts from ‘Ferragnes’ and ‘Texas’ trees. Kernel quality characteristics, oil composition and sugar composition were determined initially and after 6 months of storage. Early harvested almonds had similar kernel weight to but higher moisture content than late harvested almonds after 6 months of storage. Early harvested almonds also had similar oil quality (based on ultraviolet absorption coefficient measurements) and oil composition but lower sugar content and modified sugar composition compared with late harvested almonds. Storage of shelled almonds resulted in kernels with higher oil content, better oil quality, similar oil composition, similar sugar content and some modifications in sugar composition compared with in‐shell stored almonds. Finally, storage for 6 months at either 5 or 20 °C resulted in lower moisture content, higher oil content, similar oil quality and composition, similar sugar content and some modifications in sugar composition compared with freshly harvested almonds. Almonds stored at 5 °C retained higher kernel weight and moisture content than almonds stored at 20 °C. © 2003 Society of Chemical Industry 相似文献
87.
该研究探讨了樱桃李多酚抗氧化活性及对肥胖小鼠肝脏的保护作用,为樱桃李果实的开发、利用提供理论基础。试验以醇提法获得樱桃李多酚为材料,在测定多酚含量基础上,测定提取物体外抗氧化活性。进一步建立肥胖小鼠模型,采用不同剂量多酚灌药处理,8周后,处死小鼠,取肝脏,计算肝脏指数,测定肝脏中TG浓度、T-CHO浓度、SOD活性、MDA浓度,荧光定量PCR测定炎症相关基因的表达。结果发现,樱桃李果实多酚提取物总多酚、总黄酮、总酚酸、总黄烷醇含量分别为439.17、186.37、168.27、68.86 mg/g,樱桃李总多酚含量较高,多酚中主要成分为黄酮类;DPPH自由基清除率为97.42%,FRAP法、ABTS法测得抗氧化活性分别为4.36 mmoL/mL、0.48 mmoL/mL Trolox,体外具有较强的抗氧化活性;多酚处理能显著降低肥胖小鼠肝脏TG,T-CHO、MDA含量,增加肝脏SOD含量,下调肝脏炎症因子IL-1β、TNF-α、IL-6基因表达。研究表明,樱桃李多酚能够提高抗氧化能力,减少高脂饮食引起的肝脏脂肪堆积和肝脏炎症,对小鼠肝脏具有保护作用。 相似文献
88.
为揭示不同干燥方式对乌梅风味物质的影响,分别以烟熏乌梅(Smoked Prunus mume,SP)、热风干燥(Hot-air Dried Prunus mume,HP)乌梅及烘干(Dried Prunus mume,DP)乌梅为研究对象,采用电子鼻(Electronic Nose,E-nose)、电子舌(Electronic Tongue,E-tongue)和气相色谱-质谱(Gas Chromatography-mass Spectrometry,GC-MS)联用技术对其挥发性成分进行分析。电子鼻结果可完全区分不同加工而成的乌梅,其所在风味上具有相似性。电子舌数据结合主成分分析(Principal Component Analysis,PCA)发现不同加工方法的乌梅在滋味品质上存在差异,且酸味作为乌梅滋味的代表。采用GC-MS共鉴定出63种挥发性成分,包括醇类、酚类、醛类、酸类、酯类化合物以及烃类等其它类化合物,且含量各不相同,其中酯类化合物在烟熏乌梅中水平普遍较高,其次为热风干燥乌梅,烘干乌梅。电子鼻结合GC-MS数据讨论乌梅主要挥发性成分改变的原因,总结不同加工方法对乌梅风味的影响。可见,通过GC-MS结合电子鼻、电子舌等电子感官技术,可以很好地区分不同干燥方式处理的乌梅,进而为乌梅的加工方式选择及产品加工提供理论参考。 相似文献
89.
90.
Ossama Kodad Gloria Estopañán Teresa Juan Rafel Socias i Company 《Journal of the American Oil Chemists' Society》2013,90(2):243-252
The protein and oil content and the fatty acid profile of the kernels of selected almond genotypes from four different Moroccan regions were determined in order to evaluate the kernel quality of the plant material of these different regions. The ranges of oil content (48.7–64.5 % of kernel DW), oleic (61.8–80.2 % of total oil), linoleic (11.4–27.0 %), palmitic (5.6–7.7 %), stearic (1.3–3.1 %), and palmitoleic (0.4–0.9 %) acid percentages agreed with previous results of other almond genotypes, but the protein content (14.1–35.1 % of kernel DW) showed that some genotypes had higher values than any previously recorded in almond. Some genotypes from mountainous regions showed kernels with very high oil content as well as high and consistent oleic and linoleic ratio, establishing a possible differentiation according to the geographical origin. These differences may allow establishing a geographical denomination for almond products. In terms of genetic diversity, oleic and linoleic acids were confirmed to be the most variable components of almond oil chemical composition among genotypes. Additionally, the genotypes with extreme favorable values, such as high protein content, could be incorporated into an almond breeding program aiming at an increase in kernel quality. 相似文献