Holocene lake deposits of Bosten Lake, southern Xinjiang, China

A 9.25-m-long sediment core from Bosten Lake,Xinjiang, provides detailed information about changes in the water budget and biological acticity over the last 8400 cal-endar years. The chronology is constructed from six AMS radiocarbon dates on the terrestrial plant remains. Based onanalyses of TOC, CO3, detrital compounds and biogenic SiO2,lake level fluctuations and periods of remarkably-negative water budget appeared at 8.4-8.2 cal ka, 7.38-7.25 cal ka,5.7-5.5 cal ka, 3.7-3.4 cal ka and 3.3-2.9 cal ka, respec-tively. As they are in-phase with low lake levels at Sumxl Co and Bangong Co in western Tibet Plateau and with paleo-lakes in Inner Mongolia, a climate-induced change to some-what drier and warmer conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration may heattributed to a negative water balance prior to the main phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2-5.7 cal ka and 5.5-3.7cal ka coincide with maximum moisture during the Holocene Megathermai in China. The long term trend towards aridity since about 4.3 cal ka can dearly be recognised. The reduced water budget of Bosten Lake from 640-1200 AD may be attributed to local effects.     

4种氨基酸燃烧热的精密测定

用精密转动弹热量计测定了L-色氨酸、L-白氨酸、L-异白氨酸和L-丙氨酸的燃烧能,计算出它们的标准燃烧焓ΔcHθm分别依次为(-5575.83±3.99),(-3558.81±4.81),(-3569.32±8.33),(-1595.36±1.42)kJ/mol和标准生成焓ΔfHθm分别依次为(-467.76±4.25),(-660.14±4.88),(-649.64±8.37),(-585.58±1.48)kJ/mol。认为此结果比文献值更可靠。     

邛崃波尔山羊场牧业生态系统能流物流的研究

运用生态学的系统分析方法，以邓崃波尔山羊场牧业生态系统为研究对象，对其能流、物流以及能量和物质的转化效率和经济效益进行了研究．结果表明，该牧业生态系统以畜产品及畜体输出的能量和粗蛋白质分别占相应总输出的31．07％和31．77％，家畜能量和粗蛋白质的转化效率分别为16．560／o和17．81％，产值盈利率为36．42％，其中羊高达52．26％．该系统是一个值得推广的牧业生态系统．     

变频调速技术在滴灌中的应用

以实地试验资料为依据，分析了变频调速技术对大棚滴灌均匀度的影响及其应用于大棚滴灌的节能效果。结果表明，在同时工作的大棚数相同的情况下，水泵变频运行时的最大滴灌均匀度与水泵工频运行时的最大滴灌均匀度最大相差不超过2％，而水泵耗电量却前者只有后者的27％；同时工作的大棚数不同，变频压力需作相应的调整，以便能达到较高的滴灌均匀度；变频调速技术在大棚滴灌中具有较为明显的节能效果，其节能为65．7％～78．6％．     

动态缓变Kerr-Newman时空中的粒子能级

在Kerr—Newman黑洞随时间缓慢变化的情况下，用时间变量表示其动态特征，通过解缓变的Kerr—Newman弯曲时空中的粒子运动方程，得出了缓变的Kerr—Newman时空中的粒子能级分布．并对此分布特征进行了研究。     

YST25水压凿岩机配流阀的性能研究

配流阀是水压凿岩机的重要部件,阀芯的质量、结构、运动行程直接影响冲击活塞的频率,同时也影响凿岩机冲击机构的效率。为了减少水压凿岩机配流阀的泄漏及其能量损失,设计出一种新型配流阀。其阀口采用锥面形式,另外还采用了优化的不等阀开口量技术,并且阀芯中空结构减少了阀芯质量,经理论分析和计算表明,新型配流阀泄漏少,压力损失小,能耗低,且提高水压凿岩机的冲击效率。图3,参10。     

Ga2Se3:Co2+光谱及Co-Se键长的研究

Ga_2Se_3是典型的A_2~ⅢB_3~Ⅵ型半导体材料、它在光电方面有很大的应用潜力而被广泛关注。采用Sugano-Tanabe强场近似理论,并引入平均共价因子N,利用经典的晶场能量矩阵公式,运用完全对角化方法,拟合了Ga_2Se_3:Co~(2 )晶体的吸收光谱,得到了与实验符合甚好的理论值,从而解释了Ga_2Se_3:Co~(2 )晶体的吸收光谱。同时研究了立方场下配体键长R与晶场参量Dq的变化关系,并从理论上计算了Co-Se键长。结果表明Co离子取代Ga_2Se_3中的Ga离子后,Co-Se键长比Ga-Se键长缩小0.1A。     

重介子谱的相对论动能修正

使用超弦理论激发的伸缩子--胶子有效耦合得到的重夸克势研究了重介子的能谱，采用统一的方式来求解Salpeter方程和SchrEodinger方程，以便能真实地比较相对论动能修正的效应。发现相对论Salpeter方程更好地说明了实验上观察到的重介子能级。     

流体环境中结构附加质量的计算

采用弱耦合法来分析流体与结构的耦合作用,探讨了流体环境中影响结构附加质量的因素,并推导了流体动能的计算方法.文中计算了椭圆柱体和平坦薄膜屋盖的附加质量,得到附加质量对薄膜结构的动力特性有重要影响的结论.     

China'''' s Fundamental Research in Energy Utilizations and Environment

The progress in the science of energy utilizations will act crucial effect on the developments of energy science and technology, which will then promote social and economical developments and fulfill requirements for the national strategic objectives. For the sake of sustainable development, a harmonious blend of energy utilizations and environment considerations will become one of the vital topics in the future research area of energy science. It is suggested that clean and high-efficiency utilization of traditional or fossil energy resources, fundamental investigations on the energy and environment theory, renewable energy utilizations, and the development of nuclear energy are selected as priority research areas during the period of the Tenth Five-year Plan of China, according to the development trend of the world energy science and the research background of Chinese energy science. It is expected to promote the interdisciplinary investigations in the science of energy u-tilizations and provide scien