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排序方式: 共有164条查询结果,搜索用时 15 毫秒
1.
Fatemah M. Alhassawi Maria G. Corradini Michael A. Rogers 《Critical reviews in food science and nutrition》2018,58(11):1902-1916
Fluorescent molecular rotors (MRs) are compounds whose emission is modulated by segmental mobility; photoexcitation generates a locally excited (LE), planar state that can relax either by radiative decay (emission of a photon) or by formation of a twisted intramolecular charge transfer (TICT) state that can relax nonradiatively due to internal rotation. If the local environment around the probe allows for rapid internal rotation in the excited state, fast non-radiative decay can either effectively quench the fluorescence or generate a second, red-shifted emission band. Conversely, any environmental restriction to twisting in the excited state due to free volume, crowding or viscosity, slows rotational relaxation and promotes fluorescence emission from the LE state. The environmental sensitivity of MRs has been exploited extensively in biological applications to sense microviscosity in biofluids, the stability and physical state of biomembranes, and conformational changes in macromolecules. The application of MRs in food research, however, has been only marginally explored. In this review, we summarize the main characteristics of fluorescent MRs, their current applications in biological research and their current and potential applications as sensors of physical properties in food science and engineering. 相似文献
2.
Elisangela Corradini Priscila S. Curti Adriano B. Meniqueti Alessandro F. Martins Adley F. Rubira Edvani Curti Muniz 《International journal of molecular sciences》2014,15(12):22438-22470
Zein is a biodegradable and biocompatible material extracted from renewable resources; it comprises almost 80% of the whole protein content in corn. This review highlights and describes some zein and zein-based materials, focusing on biomedical applications. It was demonstrated in this review that the biodegradation and biocompatibility of zein are key parameters for its uses in the food-packing, biomedical and pharmaceutical fields. Furthermore, it was pointed out that the presence of hydrophilic-hydrophobic groups in zein chains is a very important aspect for obtaining material with different hydrophobicities by mixing with other moieties (polymeric or not), but also for obtaining derivatives with different properties. The physical and chemical characteristics and special structure (at the molecular, nano and micro scales) make zein molecules inherently superior to many other polymers from natural sources and synthetic ones. The film-forming property of zein and zein-based materials is important for several applications. The good electrospinnability of zein is important for producing zein and zein-based nanofibers for applications in tissue engineering and drug delivery. The use of zein’s hydrolysate peptides for reducing blood pressure is another important issue related to the application of derivatives of zein in the biomedical field. It is pointed out that the biodegradability and biocompatibility of zein and other inherent properties associated with zein’s structure allow a myriad of applications of such materials with great potential in the near future. 相似文献
3.
Janam K. Pandya Maryssa DeBonee Maria G. Corradini Mary Ellen Camire David Julian McClements Amanda J. Kinchla 《International Journal of Food Science & Technology》2019,54(12):3196-3204
Tocotrienols are members of the vitamin E family that provide many nutritional benefits. Developing tocotrienol-fortified functional foods introduces vitamin E into consumers diets without changing their food habits. The purpose of this study was to compare the stability of tocotrienols in bulk form and six food matrices at a fixed dose (40 mg kg−1) under accelerated and conventional storage conditions. The delta- and gamma-tocotrienol content was measured using HPLC, and the sensory attributes were evaluated using triangle and hedonic tests. Tocotrienol in bulk powder was less stable under stressed conditions than in bulk oil, with the powders having approximately 40% and 80% reduction in δ- and γ- after storage and bulk oil with no significant degradation. HPLC analysis demonstrated that tocotrienol content remained unchanged in dry mix lemonade, yogurt, raw and UHT milk, and margarine over time; however, complete degradation of γ- and partial degradation (up to 50%) of δ-tocotrienol was observed in bread during ambient and stressed storage conditions. A significant decrease in the δ-tocotrienol relative concentration was also observed in HTST processed milk samples. Tocotrienol addition was not perceived, and no significant difference in the product attributes and overall liking was reported in the discrimination sensory testing. 相似文献
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Corradini M. L. Cristofaro A. Orlando G. 《Automatic Control, IEEE Transactions on》2010,55(2):419-425
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Glaucia M. F. Aragao Maria G. Corradini Micha Peleg 《Journal of the American Oil Chemists' Society》2008,85(12):1143-1153
During isothermal lipid oxidation at relatively high temperatures, the peroxide concentration frequently peaks while at relatively
low temperatures it only rises slowly. These are two manifestations of a process where formation and degradation happen simultaneously
on different time scales. A phenomenological mathematical model, comprising a decay factor superimposed on an accumulation
term can describe these scenarios. Each has a characteristic time constant shortened by raising the temperature and a rate
constant that increases with it. The model’s mathematical structure and the magnitude of its coefficients depend on the particular
system. However, regardless of the chosen expressions, if the degradation characteristic time falls within or just beyond
the experiment’s duration, a peak peroxide value will be observed whose height and shape will primarily depend on the other
model’s parameters. If this characteristic time is far outside the time of the experiment , no peak will be recorded. The
model need not be unique and no detailed knowledge of the oxidation mechanisms is required for its formulation. Consequently
it can be derived directly from experimental peroxide value versus time relationships, without the need to monitor the intermediate
reactions by specialized instrumental methods such as DSC. Through the formation term adjustment, the model can also account
for the temperature dependent lag in the rise of the peroxide value and/or the appearance of its peak. 相似文献
10.
Corradini L. Mattavelli P. Tedeschi E. Trevisan D. 《Industrial Electronics, IEEE Transactions on》2008,55(4):1501-1508
This paper investigates multi sampled digitally controlled switched-mode power supplies with switching ripple compensation. In digital controllers for power converters, the main bandwidth limitations come from A/D conversion time, computational delays, and small-signal delay of the digital pulsewidth modulator (DPWM). In hard-wired digital-controller technologies, such as in dedicated digital IC and/or in field-programmable gate arrays (FPGAs), the calculation delays can be made negligible with respect to the switching period; thus, when fast ADCs are used, the overall phase lag is dominated by the DPWM. The multi sampling approach can strongly reduce the DPWM delay, thus breaking the bandwidth limitations of conventional single-sampled solutions. In this paper, the additional aliasing effects, which would require a filtering action, are avoided, exploiting the periodic nature of the switching ripple under steady-state conditions using a repetitive-based filtering action. Simulation and experimental results on a 1.2-V-10-A 500-kHz synchronous buck converter, where the digital control has been implemented in the FPGA, confirm the properties of the proposed solution. 相似文献