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排序方式: 共有321条查询结果,搜索用时 234 毫秒
111.
Arniza Ghazali Zulkarnain Zainal Mohd Zobir Hussein Anuar Kassim 《Solar Energy Materials & Solar Cells》1998,55(3):1053
Cathodic electrodeposition in the presence of EDTA in aqueous solution was found to offer some noteworthy improvements in our attempt to synthesise an SnS thin film. EDTA has shown its capacity for improving the longevity of the deposition bath as well as the adhesion of the deposited film on a titanium substrate. Photoelectrochemical analysis reveals outstanding photoactivity of the electrodeposited thin film, while an optical study shows an energy gap of approximately 1.1 eV. The effects of chelating agent were extracted from the results of cyclic voltammetry, photoelectrochemical test, scanning electron microscopy and X-ray diffraction spectroscopy. The latter which displays better defined signals reaffirms the appreciable improvement in the polycrystallinity of the thin film. Analysis of peak locations, coincidentally, confirms that SnS of Herzenbergite form has been obtained. 相似文献
112.
K. Anuar Z. Zainal M. Z. Hussein N. Saravanan I. Haslina 《Solar Energy Materials & Solar Cells》2002,73(4)
Cathodic electrodeposition in the presence of EDTA in aqueous solution was used to prepare Cu2S thin film deposited on Ti substrate. The effect of deposition potential, concentration and deposition time was studied to determine the optimum condition for electro-deposition process. Cyclic voltammetry was performed to elucidate the electrodic processes that occur while potentials for electrodeposition were applied to determine the optimum potential for electrodeposition. The thin films are characterised by X-ray diffractometry. The photoactivity of the deposited films and their conduction types were evaluated using photoelectrochemical technique. The band gap energy and type of optical transitions were determined from optical absorbance data. 相似文献
113.
Sharin Ruslay Faridah Abas Khozirah Shaari Zurina Zainal Maulidiani Hasnah Sirat Daud Ahmad Israf Nordin H. Lajis 《Food chemistry》2007,104(3):1183-1191
Curcuma xanthorrhiza and Zingiber zerumbet are two of the most commonly used ingredients in Indo-Malaysian traditional medicines, health supplements and tonics. Recently, a number of products derived from the aqueous extracts of these species have appeared in the market in the form of spray-dried powder packed in sachet or bottle. On-line high performance liquid chromatography, coupled with diode array detection and electrospray ion trap tandem mass spectroscopy (HPLC–DAD–ESI–MSn), was used to analyze the components in the antioxidant-active fractions from the rhizomes of these species. Three components were identified from C. xanthorrhiza, including bisdemethoxycurcumin (1), demethoxycurcumin (2) and curcumin (3). The active fraction from Z. zerumbet consisted of five components, including kaempferol 3-O-rhamnoside (4), compound 5 [kaempferol 3-O-(2″-O-acetyl)rhamnoside (5a) or kaempferol 3-O-(3″-O-acetyl)rhamnoside (5b)], kaempferol 3-O-(4″-O-acetyl)rhamnoside (6), kaempferol 3-O-(3″,4″-O-diacetyl)rhamnoside (7) and kaempferol 3-O-(2″,4″-O-diacetyl)rhamnoside (8). To confirm their identities, the components from Z. zerumbet were isolated conventionally and were analyzed by spectroscopic techniques as well as by comparison with literature data. 相似文献
114.
115.
Wan Ramli Wan Daud Mcor Zainal Mcor Talib Mahamad Hakimi lbrahim 《Drying Technology》1996,14(10):2387-2396
The characteristic drying curves of cocoa beans are determined by using a tunnel drier where conditioned air passes a single cocoa berm suspended from an electronic balance in the test section. Weight loss, and temperatures of air, testa and nib of the cocoa bean is monitored on personal computers. The nornmalised drying rate versus the normalised moisture content is regressed by least square method to fit a new polynomial model for the penetration falling rate period and a linear model for the regular regime falling rate period. It can be concluded that there are three drying periods for cocoa beans namely the constant drying rate period, the penetration falling rate period and the regular regime falling rate period. The polynomial model estimates the penetration period quite well whereas the linear model estimates the regular regime quite well as well. There is no observable influence of relative humidity and air temperature on the characteristic drying curve of cocoa beans. However, the air velocity seems to have some influence on the curve. 相似文献
116.
MZ Hussein NS Rahman SH Sarijo Z Zainal 《International journal of molecular sciences》2012,13(6):7328-7342
Herbicides, namely 4-(2,4-dichlorophenoxy) butyrate (DPBA) and 2-(3-chlorophenoxy) propionate (CPPA), were intercalated simultaneously into the interlayers of zinc layered hydroxide (ZLH) by direct reaction of zinc oxide with both anions under aqueous environment to form a new nanohybrid containing both herbicides labeled as ZCDX. Successful intercalation of both anions simultaneously into the interlayer gallery space of ZLH was studied by PXRD, with basal spacing of 28.7 Å and supported by FTIR, TGA/DTG and UV-visible studies. Simultaneous release of both CPPA and DPBA anions into the release media was found to be governed by a pseudo second-order equation. The loading and percentage release of the DPBA is higher than the CPPA anion, which indicates that the DPBA anion was preferentially intercalated into and released from the ZLH interlayer galleries. This work shows that layered single metal hydroxide, particularly ZLH, is a suitable host for the controlled release formulation of two herbicides simultaneously. 相似文献
117.
Abdollahi Y Abdullah AH Zainal Z Yusof NA 《International journal of molecular sciences》2012,13(1):302-315
Photocatalytic degradation of p-cresol was carried out using ZnO under UV irradiation. The amount of photocatalyst, concentration of p-cresol and pH were studied as variables. The residual concentration and mineralization of p-cresol was monitored using a UV-visible spectrophotometer and total organic carbon (TOC) analyzer, respectively. The intermediates were detected by ultra high pressure liquid chromatography (UPLC). The highest photodegradation of p-cresol was observed at 2.5 g/L of ZnO and 100 ppm of p-cresol. P-cresol photocatalytic degradation was favorable in the pH range of 6-9. The detected intermediates were 4-hydroxy-benzaldehyde and 4-methyl-1,2-benzodiol. TOC studies show that 93% of total organic carbon was removed from solution during irradiation time. Reusability shows no significant reduction in photocatalytic performance in photodegrading p-cresol. 相似文献
118.
Ifa Puspasari Meor Zainal Meor TalibWan Ramli Wan Daud Siti Masrinda Tasirin 《Chemical Engineering Research and Design》2013
Fluidization characteristics of crushed oil palm fronds were studied. The elongated shape of the particles and their fibrous nature created entanglement between the particles and caused the bed to form crack and plug flow when aerated in ordinary fluidized bed. Fluidization of the fibres became feasible with the aid of mechanical agitation. Agitation helped to loosen the entanglement of the fibres which prevents air to pass through the bed of particles, as a result, fluidization state could be attained. Experiments were carried out in a column with height of 72 cm and ID of 14.4 cm. Superficial air velocities used ranged from 0.1 to 1.1 m/s, bed heights ranged from 4 to 8.5 cm, agitation speeds ranged from 300 to 500 rpm and particle initial moisture contents from 0.5 to 2.4 g water/g dry solids. Analysis of the fluidization characteristics showed that minimum fluidization velocity was independent with bed height and agitation speed. However, investigation on the effect of particle initial moisture content showed that minimum fluidization velocity increased with particle moisture content. A new empirical correlation to predict minimum fluidization velocity has been derived which gives good agreement with experimental data in this study and the data from other study in the literature. 相似文献
119.
Raees Khan
mer Kili Sheikh Zain Ul Abidin Asad Ullah Hadayat Ullah Muhammad Zafar Mushtaq Ahmad Shujaul Mulk Khan 《Microscopy research and technique》2019,82(7):1231-1239
For the robust identification of weeds of taxonomically complex families like Poaceae, scanning electron microscopy (SEM) and light microscopy (LM) are of significant implications. In this study, SEM and LM methods were used by investigating 12 Pakistani weedy grass species as an example for foliar epidermal micromorphological characters for its role in the identification of grasses species. Qualitative and quantitative foliar micromorphological variations in stomatal type, number, guard cells, subsidiary cells, silica bodies and trichomes were studied. Significant variation was observed in both qualitative and quantitative features and based on this diversity in epidermal characters, a key was drawn to delimitate the species. Variations in stomata, silica bodies (SiO2·nH2O), macrohairs, microhairs, hooks, papillae, prickles, and other epidermal structures were used in establishing the taxonomic key. The data were also statistically evaluated by determining its mean, standard deviation, variance, the coefficient of variance, and standard error. Foliar epidermal characters such as silica bodies shape and trichomes were taxonomically more useful than stomatal types, subsidiary, and guard cells. SEM and LM micromorphological characters were of substantial importance in the delimitation of closely related species. 相似文献
120.
The concept of external fired micro gas turbine (EFMGT) using biomass fuels is getting more attention in the last two decades. However, most of the studies were conducted using computer simulation to evaluate the EFMGT systems with a lack of experimental studies. A small scale EFMGT was developed using a vehicular turbocharger as a micro gas turbine. Different micro turbine startup methods were experimentally investigated with maximum turbine inlet temperature and pressure of about 694 °C and 2.1 bar, respectively. The difficulties experienced during the turbocharger engine startup process are reported in this paper. Driving the turbocharger shaft from the compressor side using the air flow hydraulic power was not a sufficient method for the EFMGT unlike the directly fired turbine. The only proven turbine startup method for the EFMGT is the mechanically driven turbine shaft. 相似文献