GRAIN DRYING USING CONTINUOUS AND PULSED MICROWAVE ENERGY

A laboratory microwave oven was used to dry high-moisture corn samples. The microwave oven was operated in both continuous and pulsed modes at 250 W of magnetron power setting. In the pulsed mode, two magnetron power-on times of 10 s and 15 s were used each with different power-off times in the range of 20 s to 75 s. Drying was more rapid in the continuous mode than in the pulsed mode. But, the continuous mode required much higher total magnetron power-on times. In the pulsed mode, longer power-on times generally resulted in slightly faster drying; and the power-off times did not strongly influence the drying rate. Longer power-on times should be followed by relatively longer power-off times. For a given on-time, increase in power-off time helps to decrease the total power-on time required for drying. When the microwave oven was operated at 10 s of power-on and 75 s of power-off pulsing, it resulted in the lowest total power-on time.     

Delineating the effect of substituent and π-bridge flip on the photophysical properties of pyrene derivatives: answers from DFT/TD-DFT calculations

Journal of Materials Science - Pyrene-based Schiff base derivatives have attracted enormous potential as fluorescent probe for multifarious research applications due to their fashionable...     

Interfacing geometric model data with rapid prototyping systems

The direct slicing of CAD models created in CADDS V to generate geometric data for rapid prototyping using fused feposition modeling technique (FDM) is presented in this paper. The report file from an explicit model is accessed for obtaining model data. Algorithms have been developed for determining the volumes of model material as well as support materials. New algorithms have been developed for filling the sheet solid. A simulation module has been developed to verify whether the filling is correctly done. Example of a model is manufactured using this approach is also presented in this paper.     

Conformational interconversions in peptide beta-turns: analysis of turns in proteins and computational estimates of barriers

The two most important beta-turn features in peptides and proteins are the type I and type II turns, which differ mainly in the orientation of the central peptide unit. Facile conformational interconversion is possible, in principle, by a flip of the central peptide unit. Homologous crystal structures afford an opportunity to structurally characterize both possible conformational states, thus allowing identification of sites that are potentially stereochemically mobile. A representative data set of 250 high-resolution (相似文献   

GRAIN DRYING USING CONTINUOUS AND PULSED MICROWAVE ENERGY

A laboratory microwave oven was used to dry high-moisture corn samples. The microwave oven was operated in both continuous and pulsed modes at 250 W of magnetron power setting. In the pulsed mode, two magnetron power-on times of 10 s and 15 s were used each with different power-off times in the range of 20 s to 75 s. Drying was more rapid in the continuous mode than in the pulsed mode. But, the continuous mode required much higher total magnetron power-on times. In the pulsed mode, longer power-on times generally resulted in slightly faster drying; and the power-off times did not strongly influence the drying rate. Longer power-on times should be followed by relatively longer power-off times. For a given on-time, increase in power-off time helps to decrease the total power-on time required for drying. When the microwave oven was operated at 10 s of power-on and 75 s of power-off pulsing, it resulted in the lowest total power-on time.     

Simple method for estimation of hemoglobin in human blood using color analysis.

Anemic conditions in women and children across the world are a serious cause for concern. The standard method for measuring hemoglobin (Hb) in human blood is the well-recognized cyanmethemoglobin method as recommended by the World Health Organization (WHO). There are a number of methods available that give very approximate results as compared to this method. The color-measurement technique is one of them and it is recommended by the WHO for adaptation in low-resource settings. Since human interpretation errors are likely to creep in during the subjective processes involved with this method, an artificial neural network (ANN) approach for the estimation of Hb count in human blood has been evaluated. The ANN used color-coded values of the samples as input and the Hb value, as obtained with the cyanmethemoglobin method, as desired output using 2007 samples. The results show a strong relation between the color of the blood sample and the Hb level in the blood.     

Fuzzy logic controller with MPPT using line-commutated inverter for three-phase grid-connected photovoltaic systems

A fuzzy logic controller has been developed for interfacing PV array with utility grid through a three-phase line-commutated inverter for the first time. The controller tracks and feeds maximum power to the utility grid. The linguistic variables have been selected appropriately to modulate the firing angle of the inverter for tracking the maximum power. The simulink model of the proposed scheme employing fuzzy logic controller has been built using MATLAB/PSB. A PIC microcontroller has been programmed for generation of firing pulses to the thyristors in the inverter. Experimental setup of the proposed scheme has been built and the results obtained on a PV array of 54 V, 12 A rating are presented. The comparison of experimental and simulation results shows very close agreement between the two thus validating the controller proposed.     

变压器油现场净化／改进专用的聚合胶混合成材料

聚合胶泥聚合胶泥是一种高度填充的合成材料。它不是水凝的水泥混凝土 ,而是一种热凝的材料。它实质上是在室温下加工的。加工方法可以是简单的批量加工 ,或利用微处理机控制的尖端的可连续输出的机器。必要时 ,可在聚合胶泥内部用切断的玻璃纤维、芳族聚酰胺 aramid(“Kevlar”)、碳等来加强 ,也可以结合基于这些材料的连续加强。在许多不同的工程场合中 ,聚合胶泥正在不断地获得广泛范围的应用。在美国电力工业的地下和架空应用中 ,聚合胶泥已经占有主导地位。在过去 2 5年中 ,聚合胶泥作为一种低廉的介质材料已取得很大的发展 ,它在各种…     

Three-Dimensional Image Reconstruction Procedure for Food Microstructure Evaluation

Confocal laser scanning microscopy (CLSM) is a noninvasive technique for evaluating the microstructure of foods and other materials. CLSM provides several sequential subsurface layers of two-dimensional (2-D) images. An image processing algorithm was developed to reconstruct these 2-D layers into a three-dimensional (3-D) network. Microstructure of fat globules in cheese was used as an example application. The validity of the image reconstruction algorithm was evaluated by processing several layered digital images of known shape and size. Differences between the original and reconstructed images were 2–5% in terms of object size and 1–8% in terms of shape.     

Overexpression of extracellular sucrase (SacC) of Zymomonas mobilis in Escherichia coli

The extracellular sucrase (SacC) gene of Zymomonas mobilis was overexpressed in Escherichia coli BL21 using the T7 polymerase expression system. A low cell density induction method was designed to have maximum expression, and the conditions (IPTG concentration, ampicillin addition) were optimised to overexpress to the level of more than 60% of the total cellular protein representing SacC protein.