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1.
In this research, the biosorption of phenol using the fibres of a Mediterranean seagrass Posidonia oceanica (L.) was studied. Batch experimental procedures were made to investigate the ability of this novel marine biomass to remove phenol from aqueous phase. The influences of pH and contact time at different initial concentrations were evaluated. The results showed that biosorption capacity was enhanced using solution pH equal to 5.2. The modelling results showed that pseudo‐second‐order and Redlich‐Peterson models were found to be the most suitable to satisfactory describe the kinetic and equilibrium adsorption data, respectively. 相似文献
2.
In this work, we investigated an integrated technology for the treatment of the recalcitrant contaminants of olive mill wastewaters (OMW), allowing water recovery and reuse for agricultural purposes. The method involves an electrochemical pre-treatment step of the wastewater using the electro-Fenton reaction followed by an anaerobic bio-treatment. The electro-Fenton pre-treatment process removed 66% of the total polyphenolic compounds and subsequently decreased the OMW toxicity from 100 to 66.9%, which resulted in improving the performance of the anaerobic digestion. A continuous laboratory-scale methanogenic reactor was operated at a loading rate of 10g COD/L per day without any apparent toxicity. Furthermore, in the combined process, a high overall reduction in COD, suspended solids, polyphenols and lipids content was achieved by the two successive stages. Moreover, this combined process which was experimented at a real scale (25 m3 digester) demonstrated its technical feasibility and opens promising perspectives for industrial application in the Mediterranean countries because of its easy conception and high energy (methane) production. 相似文献
3.
To achieve size preserving tracking, in addition to controlling the camera’s pan and tilt motions to keep the object of interest
in the camera’s field of view (FOV), the camera’s focal length is adjusted automatically to compensate for the changes in
the target’s image size caused by the relative motion between the camera and the target. The estimation accuracy of these
changes determines the effectiveness of the resulting zoom control. The existing method of choice for real-time target scale
estimation applies structure from motion (SFM) based on the weak perspective projection model. In this paper we propose a
target scale estimation algorithm with a linear solution based on the more advanced paraperspective projection model, which
improves the accuracy of scale estimation by considering center offset. Another key issue in SFM based algorithms is the separation
of target and background features, especially when composite camera (pan/tilt/zoom) and target motions are involved. This
paper designs a fast target feature separation/grouping algorithm, the 3D affine shape method. The resulting separation automatically
adapts to the target’s 3D geometry and motion and is able to accommodate a large amount of off-plane rotation, which most
existing separation/grouping algorithms find difficult to achieve. Experimental results illustrate the effectiveness of the
proposed scale estimation and feature separation algorithms in tracking translating and rotating objects with a PTZ camera
while preserving their sizes. In comparison with the leading size preserving tracking algorithm described by Tordoff and Murray,
our algorithm is able to reduce the cumulative tracking error significantly from 17.4% to 3.3%. 相似文献
4.
Rania Mhiri Mona Kchaou Sahla Belhadj Abdelfattah El Feki Noureddine Allouche 《Sensing and Instrumentation for Food Quality and Safety》2018,12(2):839-847
The aromatic compounds and biological activities of essential oils from six Tunisian aromatic plants including Artemisia herba-alba, Rosmarinus officinalis, Thymus capitatus, Mentha piperita, Ocimum basilicum and Artemisia absinthium were investigated. Hydro-distillation was used to extract essential oil from these plants. The identification of compounds from essential oils was performed using GC–MS analysis. Camphor (28.47%) was the major compound of A. absinthium essential oil. High contents of verbenone (20.99%) and camphor (19.72%) were found in R. officinalis. In the case of T. capitatus, carvacrol (81.09%), gamma terpinene (6.61%) and caryophyllene (4.87%) were identified as the major compounds. While eugenol (24.69%), linalool (18.00%) were characteristic compounds of O. basilicum essential oil, camphor (39.10%) and farnesol (14.25%) together with bornyl acetate (12.31%) were the main constituents of A. absinthium. These oils were also subjected to a screening for their antioxidant activity and essential oil from A. absinthium showed a greater antioxidant activity (IC50?=?0.0063 mg/mL) compared to the standard Vitamin E (IC50?=?0.019 mg/mL). The antibacterial activities of the oils against seven pathogenic strains, Pseudomonas aeruginosa, Bacillus cereus, Salmonella, Klebsiella pneumoniae, Escherichia coli, Staphylococcus aureus, Enterococcus faecalis and Micrococcus luteus, were tested. The highest and broadest activity was shown by M. piperita; however, Ocimum basilicum was inactive against all strains. Essential oils were also evaluated for antidiabetic and anti-acetylcholinesterase activities. The IC50 values of A. herba-alba and O. basilicum against α-amylase were respectively 17.76 and 16.32 µg/mL suggesting a powerful anti-diabetic effect comparable to that of acarbose (IC50?=?14.88 µg/mL). R. officinalis, M. piperita and A. absinthium exhibited an interesting acetylcholinesterase inhibition with IC50 equal to 22, 24 and 58 µg/mL respectively. 相似文献
5.
In this work, we report the structural, morphological, and optical properties of TiO2 thin films synthesized by the electro phoretic deposition technique. The TiO2 film was formed on a doped fluorine tin oxide (SnO2:F, i.e., FTO) layer and used as a photo electrode in a dye solar cell (DSC). Using spectroscopic ellipsometry measurements in the 200 to 800 nm wavelengths domain, we obtain a thickness of the TiO2 film in the range of 70 to 80 nm. Characterizations by X-ray diffraction and atomic force microscopy (AFM) show a polycrystalline film. In addition, AFM investigation shows no cracks in the formed layer. Using an ultraviolet–visible near-infrared spectrophotometer, we found that the transmittance of the TiO2 film in the visible domain reaches 75%. From the measured current–voltage or I-V characteristic under AM1.5 illumination of the formed DSC, we obtain an open circuit voltage Voc = 628 mV and a short circuit current Isc = 22.6 μA, where the surface of the formed cell is 3.14 cm2. 相似文献
6.
Mongi Jemmali Talluri R. K. Murthy 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1976,265(5):13-17
A method is presented for the determination of aflatoxins in animal tissues. It consists of extraction of aflatoxins from the sample with methanol, treatment of the residue with a mixture of dimethoxymethane-methanol (4 + 1) to further precipitate proteins, evaporation of dimethoxymethane followed by a liquid-liquid defatting with hexane and heating of the methanol-water mixture before the transfer of aflatoxins into chloroform. Chloroform extracts are further purified by silica gel—acidic alumina—anhydrous sodium sulfate column chromatography. 相似文献
7.
8.
The properties of oxide layer obtained on aluminium in mixed electrolytes of oxalic acid-sulphuric acid are optimized using experimental design. For this purpose, a four variables Doehlert design (bath temperature, anodic current density, sulphuric acid and oxalic acid concentrations), was achieved. In order to maximize the growth rate and the microhardness of the anodic oxide layer and to minimize in the same time their chemical and abrasion resistances, a multicriteria optimization using desirability function was conducted. Dissolution rate of the oxide in phospho-chromic acid solution (ASTM B 680-80) was used to express its chemical resistance.Under the determined optimal anodizing conditions (Cox = 12.6 g L− 1, 10 °C, 2.6 A dm− 2, Csul = 183.6 g L− 1), the estimated response values were 0.73 μm min− 1, 4.38 g m− 2 min− 1, 481 Hv and 53.3 g m− 2 for growth rate, dissolution rate, microhardness and weight loss after abrasion respectively. The higher abrasion and chemical resistances of the optimum anodic layer can be correlated with its morphology revealed by AFM and SEM observations. 相似文献
9.
10.
Solubility and liquid-liquid phase equilibrium data are presented for the ternary system water-phosphoric acid-methyl isobutyl ketone at 25 and 40°C. Binodal curves, tie lines and distribution curves have been determined. Hand's method has been used to correlate tie lines and to calculate coordinates of plait points. The heterogeneous region at 40°C appeared to be slightly broader than that at 25°C, and the slopes of tie lines somewhat higher: the solubility of this system increases with decreasing temperature. The distribution curves indicated that methyl isobutyl ketone was an effective extractant for concentrated phosphoric acid solutions only. 相似文献