Photoelectric Conversion Efficiency Enhanced by Tilting Monocrystalline Silicon Photovoltaic Devices

Based on the idea of tilting a photoelectric conversion device,the monocrystalline silicon p-n junction device was tilted to make light incident upon the device at an angle of 45° with the normal of the device surface,resulting in infrared multiple-internal-reflection inside the device.The internal reflection leads to path length increase of infrared light,making the enhancement of infrared absorption of the device.An increase of 11% in energy conversion efficiency has been obtained through tilting the device.

籽粒性状对玉米产量和机收的影响研究进展

本文对玉米籽粒性状对玉米产量和机收的影响研究进展进行阐述,包括单株粒数、百粒重与产量的关系;籽粒构型和产量的关系;籽粒性状与玉米机收品种选择的关系。单株粒数和百粒重与单株产量密切相关,通过改良单株粒数和百粒重可有效提高产量。单穗产量与绝大多数籽粒构型性状显著相关,特别是与粒长的相关系数最高;对单穗产量影响较大的性状有粒长、粒厚、穗长、出籽率和粒长/穗半径。玉米籽粒含水率决定籽粒的软硬程度,直接影响玉米机收的破碎率、损失率和杂质率,从而影响籽粒机收的效果。因此,在实际玉米育种中,应选择出籽率高、品质好的玉米材料;关注籽粒性状,尽量选择穗粗、粒大、粒长等性状的材料进行研究;同时利用美系和欧洲的脱水性状突出种质材料,并充分利用杂优模式。