成都花卉塑料薄膜大棚热量平衡初探     

黄斌  罗秀陵 《成都信息工程学院学报》1993,(3)

本文在测量的基础上,对热量平衡各分量在大棚内、外的差异,进行了比较与分析,对大棚生产管理有重要参考价值。  相似文献   

Study on methods of land use dynamic monitoring at county level     

Lin-yi Li  Fang Huang  Zhao-li Liu  En-pu Wan 《中国地理科学(英文版)》2001,11(2):181-185

Remote sensing technique has played an important role in land use dynamic monitoring, but as for the land use dynamic monitoring at county level, traditional remote sensing methods such as satellite imagery visual interpretation and computer classification can not meet its demand for accuracy. The result of 1: 10 000 land use investigation map has high accuracy, but this method can not be used to dynamically monitor the land use because of its big expenses, long period and difficulty in updating data. In this paper, the characteristics of physiognomy, climate and the status of land use in Dehui County are taken into consideration and a set of method, which takes use of 3S techniques and applies to Northeast China Plain, is come up with. When the land use type of a land parcel changed as a whole, the date updating can be make by changing its land type ID in the attribute table in a GIS. When the land use type of an irregular area changed, GPS receivers are used to position its border. This set of method is characteristic of high accuracy and low expenses. It gets the information of land use change timely and can be used to dynamically monitor the land use. Foundation item: Under the auspices of the key project of the National Ninth Five-year Plan (96-B02-01-07). Biography: LI Lin-yi (1968 —), female, a native of Jilin, Ph. D. candidate of Changchun Institute of Geography, the Chinese Academy of Sciences. Her research interest includes land use change monitoring and crop yield estimation using “3S” techniques.  相似文献   

Some characteristics of pulsations in radio bursts at 9.375 GHz     

Zhihai Qin  Guangli Huang 《Astrophysics and Space Science》1994,218(2):213-222

A type of pulsation in a time scale of seconds superimposed on microwave burst at 9.375 GHz has been found during the twenty-second solar active maximum period by us. This phenomenon is quite different from radio spike emission at decimeter and long centimeter wavelengths. The flux level of the bursts rises as the repetition rate of pulsations increases, following an approximate linear relationship. This feature resembles that at mm wavelength, but some other features are different. Some mechanisms for interpretation have been proposed.  相似文献   

山区≥10℃积温推算方法的讨论     

黄克新  宁晓松 《山地学报》1991,(1)

本文探讨了几种推算山区≥10℃积温的方法,认为由我国学者所采用的直方图推算法以及计量地理学中的三元线性回归数学模型推算法,在实际应用中都存在不完善和局限性,将两者结合起来进行复合推算,是一种较理想的研究方法。  相似文献   

Harmonic Structures of Gyrosynchrotron Radiation and Cyclotron Maser Instability     

Ai-Hua Zhou  Guang-Li Huang 《中国天文和天体物理学报》2001,1(4):365-371

1 INTRODUCTIONSolar microwave bursts are usually produced by dtherellt radiation mechanisxns: gyroresonance absorption, Coulomb brernsstrahlung of the thermal baCkground plasma, as well asgyrosynchrotron radiation of the nonihermal electrons (Hildebrandt et al. 1998). Meanwhile,cyclotron or synchrotron maser instabilities may be responsible for microwave spaaes, blips, andtype ill bursts (Wu 1985; Huang 1987; Huang et al. 1996; Huang 1998), which are usuajly superposed on the ambient mi…  相似文献   

SEA LEVEL RISE OF THE ZHUJIANG RIVER DELTA AND NEOTECTONICS     

曾昭璇  刘南威  胡男  丘世钧  黄山  李平日  方国祥  黄光庆  祝功武 《中国地理科学(英文版)》1993,3(1):44-50

A linear regression analysis of 28 selected tide-gauge stations of the Zhujiang Estuary shows that there has been a tendency of local sea level rise at a rate of 2.028 mm per year. The origin of the variation is significantly attributed to the local tectonic movement of discrepant fault-block. Based on this, four types of relative local sea level changes are classified. According to calculation, half of the fertile land, or 800 km2 of the delta plain will have been submerged by sea water by about 2040. This will yield a significant influence on the economic construction and human activities.  相似文献   

Long-term evolution of the Neptune Trojan 2001 QR322     

R. Brasser  S. Mikkola  T.-Y. Huang  P. Wiegert  K. Innanen 《Monthly notices of the Royal Astronomical Society》2004,347(3):833-836

  相似文献   

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郭良迁  黄立人 《大地测量与地球动力学》2008,28(4):17-24

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Surface sediment diatoms from the western Pacific marginal seas and their correlation to environmental variables     

黄玥  蒋辉  Svante Bjrck  李铁刚  吕厚远  冉莉华 《中国海洋湖沼学报》2009,27(3):674-682

Diatom data of 192 surface sediment samples from the marginal seas in the western Pacific together with modern summer and winter sea surface temperature and salinity data were analyzed.The results of canonical correspondence analysis show that summer sea-surface salinity(SSS) is highly positively correlated with winter SSS and so is summer sea-surface temperature(SST) with winter SST.The correlations between SSSs and SSTs are less positively correlated,which may be due to interactions of regional current pa...  相似文献   

Effect of n?3 HUFA levels in rotifers and Artemia on growth and survival of larval black sea bream ( Sparus macrocephalus )     

Liu Jingke  Li Kuiran  Huang Bingxin  Chen Xiaolin 《中国海洋湖沼学报》2004,22(4):421-424

Requirement for dietary n−3 HUFA (n−3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers andArtemia at various levels of n−3 HUFA. Five treatments with rotifers andArtemia differing in n−3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n−3 HUFA significantly influence fish n−3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n−3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n−3 HUFA fatty acid ethyl esters from ethyl-esterified oil. Project No. 39770588 supported by the NSFC.  相似文献