By Cathy Baker
EASY-TO-BUILD tasks FOR THE WEEKEND WOODWORKER! glance over the diversity of easy wood-working tasks within the bulletin and you'll quick locate whatever that merits a spot at your residence. A small desk for the hallway, possibly, or an Adirondack chair or picnic set for the deck or backyard? the good news is that you just don't have to be a grasp wood worker with a basement choked with energy instruments to craft those good-looking and functional goods. With a number of easy hand instruments and Cathy Baker's step by step directions and easy-to-follow illustrations and diagrams, you could construct good, sturdy, attractive wood furniture that you just and your loved ones will get pleasure from for future years. initiatives include:
Picnic desk and benches
Read or Download Building Simple Furniture (Storey's Country Wisdom Bulletin A-06) PDF
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Additional resources for Building Simple Furniture (Storey's Country Wisdom Bulletin A-06)
17 Better utilization of the solar spectrum through the multijunction approach. 4 Multiple Junction Cells The tandem or multicolor cell uses the strategy of increasing the number of energy levels. Solar cells consisting of p–n junctions in different semiconductor materials of increasing bandgap are placed on top of each other, such that the highest bandgap intercepts the sunlight ﬁrst. The elegance of the approach – ﬁrst suggested by Jackson in 1955 – is that both spectrum splitting and photon selectivity are automatically achieved by the stacking arrangement.
When illuminated, the solar cell produces a photocurrent proportional to the light intensity. This photocurrent is divided by the load and the diode, in a ratio that depends on the light intensity and on the load resistance. In real cells, power is dissipated through the contact resistance and through leakage currents around the sides of the device. 13. 12 The solar cell is equivalent to a current generator in parallel to a resistive diode. (Reproduced from Ref. , with permission). 13 Effect of (a) increasing series resistance and (b) reducing parallel resistance on the current–voltage curve.
It thus follows that, for an ideal diode, V OC ¼ kB T ln(J SC þ1) q Jo ð2:9Þ In other words, the VOC increases logarithmically (and thus very slowly) with light intensity. 11 shows that the cell generates power when the voltage is between 0 and VOC. At V < 0 the cell acts as a photodetector, consuming power to generate a photocurrent. In certain cases, in this diode regime, the dark current in solar cells is accompanied by emission of light. 12). It is this diode that establishes a photovoltage enabling the photocurrent through the load.