应用格林——安布普特模型解决地表水深随时间变化的入渗问题

与简单的入渗模型的消退曲线相比较,格林一安布普特最早提出的模型非常清楚地考虑了表面水深的影响及其对短小河渠的应用。对于纵剖面不连续线以上的饱和带以及其下处于初始含水量状况下的半无限区域里,格一安方程假定土壤含水量纵剖面线是阶跃函数(图1)。     

STRUCTURAL STUDIES ON THE OLIGOMERS FROM THE POLYSACCHARIDE OF GRACILARIA TEXTORII (RHODOPHYTA) USING β-AGARASE AND 13C-NMR SPECTROSCOPY

The 60% ethanolic extract from Gracilaria textorii (Rhbdophyta) was degraded with B- agarase, and certain charged (sulfated) and neutral oligosaccharides were separated by using DEAE Sephadex A 25 and Bio- gel P6 , P2 chromatographic techniques . Some of the charged oligomers were verified to be neoagarotetraose - 63- sulfate ( DP2 ). neoagarohexaose- 63 > 65 - disulfate ( DP3 ) and neoagarooctaose- 63, 65, 67-trisulfate (DP4) by using 13C-and 'H-NMR spectroscopy . One neutral oligomer was assumed to be a mixture of methylated neoagarotetraoses (DP2 ) by 1H-NMR spectroscopy .These oligomers assigned by their chemical shifts may be used as the model compounds for the structural investigation of the agar- type sulfated polysaccharides using the B- agarase degradation method .     

A program for evaluating dual-equilibrium desorption effects on remediation

Desorption is one of the most critical processes affecting the effectiveness of soil and ground water remediation. None of the currently adopted desorption models can accurately quantify desorption of low-hydrophobicity organic chemicals, and thus could potentially mislead remediation design and decision-making. A recently developed dual-equilibrium desorption (DED) model was found to be much more accurate in quantifying desorption. A screening-level transport model, DED-Transport, was developed to simulate the DED effect on behaviors of organic contaminant plumes during remediation. DED-Transport requires only simple parameters, but is applicable to many remediation scenarios. DED-Transport can be used as a decision-support tool in site remediation to more precisely predict the time required for cleanup.     

Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*

We report the detection of linear polarization from Sgr A* at 750, 850, 1350, and 2000 μm which confirms the contribution of synchrotron radiation. From the lack of polarization at longer wavelengths, it appears to arise in the millimeter/submillimeter excess. There are large position angle changes between the millimeter and submillimeter results, and these are discussed in terms of a polarized dust contribution in the submillimeter and various synchrotron models. In the model that best explains the data, the synchrotron radiation from the excess is self-absorbed in the millimeter region and becomes optically thin in the submillimeter. This implies that the excess arises in an extremely compact source of approximately 2 Schwarzschild radii.     

First Mass-resolved Measurement of High-Energy Cosmic-Ray Antiprotons

We report new results for the cosmic-ray antiproton-to-proton ratio from 3 to 50 GeV at the top of the atmosphere. These results represent the first measurements, on an event-by-event basis, of mass-resolved antiprotons above 18 GeV. The results were obtained with the NMSU-WIZARD/CAPRICE98 balloon-borne magnet spectrometer equipped with a gas-RICH (Ring-Imaging Cerenkov) counter and a silicon-tungsten imaging calorimeter. The RICH detector was the first ever flown that is capable of identifying charge-one particles at energies above 5 GeV. The spectrometer was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The measured p&d1;/p ratio is in agreement with a pure secondary interstellar production.     

喜马拉雅的重力异常和板块构造

恒河盆地和喜马拉雅的巨大重力负异常是通过印度地壳沿不同的逆掩带以 1 5°± 5°的低角度俯冲在喜马拉雅之下的模式得到重建的。在此模式中 ,喜马拉雅未达均衡补偿 ,而被包卷横切山系的地壳短缩 ,推测达 30 0— 40 0 km。中印度高原上的重力“高”可能由岩石圈的弯曲(与在大洋深海槽向海洋部分所见到的相似 )所引起。     

气体水合物聚积的数学模型

世界上各大陆边缘和北极广泛分布气体水合物的储集场所，但人们对其形成知之甚少。我产运用恒原理推导出一系列方程，用以描述在均匀的渗透介质中水合物的形成。利用比例宗量，我们能识别不同环境下水合于聚积最重要的物理过程。这一知识可用来钩建在各种环境下，能定量描述水合物地层发展的模型。这些模型与最近在海洋沉积物中野外观测水合物相比较，二者非常吻合。     

THE SIGNIFICANCE OF THE SINAL FORMULA IN DEVONIAN AND POST-DEVONIAN SPIRIFERS

Recent study, has brought out the fact that members of the Spiriferidae, in which the sinus is plicated, are divisible into a series of distinct gronps, each of which shows a definite order of appearance of the plications in the sinus of the pedicle valve.     

REVISED CLASSIFICATION OF THE PALEOZOIC SYSTEMS IN THE LIGHT OF THE PULSATION THEORY

The Chronological classification of the rocks of the Earth's crust beganin the 18th century when John Strachey in England,Giovanni Arduino inItaly and Lehman,Füchsel,and Werner in Germany began their subdivisionon the lithological and structural basis.