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41.
林德30000m^3/h空分手动变负荷生产的探索与实践 总被引:2,自引:0,他引:2
针对武钢引进的两台30000m3/h空分自动变负荷生产调节范围小、时间长的问题,探索了人工手动变负荷的操作方法,扩大了增减产范围,缩短了调节时间. 相似文献
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Santos VG Regiani T Dias FF Romão W Jara JL Klitzke CF Coelho F Eberlin MN 《Analytical chemistry》2011,83(4):1375-1380
The development and illustrative applications of an ambient ionization technique termed Venturi easy ambient sonic-spray ionization (V-EASI) is described. Its dual mode of operation with Venturi self-pumping makes V-EASI applicable to the direct mass spectrometric analysis of both liquid (V(L)-EASI) and solid (V(S)-EASI) samples. V-EASI is simple and easy to assemble, operating solely via the assistance of a sonic stream of nitrogen or air. The sonic gas stream causes two beneficial and integrated effects: (a) the self-pumping of solutions via the Venturi effect and (b) sonic-spray ionization (SSI) of analytes either in solution or resting on solid surfaces. In its liquid mode, V(L)-EASI is applicable to analytes in solution, forming negatively and/or positively charged intact molecular species in a soft fashion with little or no fragmentation. In its solid mode, V(S)-EASI relies on Venturi self-pumping of a proper SSI solvent solution in combination with SSI to form a stream of bipolar charged droplets that bombard the sample surface, causing desorption and ionization of the analyte molecules. As for its precursor technique (EASI), V-EASI generates bipolar droplets with considerably lower average charging, which increases selectivity for ionization with high signal-to-noise ratios and clean spectra dominated by single molecular species with minimal solvent ions. V-EASI also operates in a voltage-, heat-, and radiation-free fashion and is therefore free of thermal, electrical, or discharge interferences. 相似文献
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A net deposition model (dependent on friction velocity) that accounts for ideal deposition of aerosols to a surface, rebound of particles impacting the surface, and reentrainment of particles previously deposited on the surface has been developed. The model time step is based on a scaled time interval between coherent boundary layer structures (bursts), with deposition, rebound, and reentrainment determined for each time step. Deposition and rebound are functions of friction velocity, and reentrainment is based on a Monte-Carlo simulation using a surface renewal concept. The model was used to simulate net deposition of six different particle-surface pairs. Results were found to generally describe experimental data well, although some differences were present. 相似文献
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Gleuber Henrique Marques-Oliveira Thaís Marques Silva Helder Magno Silva Valadares Helena Fonseca Raposo Ruither de Oliveira Gomes Carolino Maria Antonieta Rissato Garófalo Janete Aparecida Anselmo-Franci Isis do Carmo Kettelhut Helena Coutinho Franco de Oliveira Valéria Ernestânia Chaves 《Lipids》2019,54(4):231-244
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Thaís J. Borges Letícia K. Moretti Marselle M. N. Silva Eduardo C. Tondo Karen S. Pereira 《Journal of Food Safety》2020,40(2):e12748
Salmonella spp. is one of the main lettuce pathogens and should be inactivated during the disinfection of these vegetables before consumption. In minimally processed vegetable industries, residues of organic matter can prevent the inactivation of this pathogen by disinfectants. The objective of the present work was to evaluate the inactivation of Salmonella isolated from organic lettuce to sodium hypochlorite (25 and 50 ppm) and citric acid (0.5 and 1%) in washing water added with lettuce residues. To do so, a washing water with lettuce residues was elaborated, and Salmonella was added in the order of 106 CFU/ml. Thereafter, each sanitizer was added separately to evaluate its effect on reducing Salmonella counts. After 1, 2, 3, 4, 5, 10, and 15 min of contact with the sanitizers, serial dilutions using neutralizer (0.5% sodium thiosulfate) were performed and each dilution was sown in Xylose-Lysine-Desoxycholate medium. Total aerobic mesophilic counts of wash water with lettuce residues before testing (without Salmonella) and after 15 min of exposure to each sanitizer (with Salmonella) were also performed. In addition, the free chlorine still present in the samples after the contact of sodium hypochlorite with lettuce residues for 15 min. The results demonstrated that 50 and 25 ppm sodium hypochlorite could reduce 6 log CFU/ml of Salmonella in 1 and 3 min of contact, respectively, while 0.5 and 1% citric acid was able to reduce 1.26 and 1.74 log CFU/ml respectively from the same microorganism within 15 min of contact. The total aerobic mesophilic counts of the wash water before being tested were, on average, 1.5 log CFU/ml. After addition of Salmonella, with 15 min of contact with the sanitizer, the results of total counts showed the same magnitude as the Salmonella counts. Organic matter may have reacted with the free chlorine present, reducing chlorine concentrations, since values of 30.4 ppm were observed when the initial concentration should be 50 and 17.1 ppm when the initial concentration should be 25 ppm. Based on the results, sodium hypochlorite demonstrated a greater microbial reduction capacity in wash water with lettuce residues, indicating that it is more appropriate to avoid cross-contamination between batches during sanitation of lettuce in washing tanks. 相似文献
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