变质量力学系统的高阶万有DAlembert原理

从Мещерский方程出发,首先建立变质量力学系统的高阶万有DAlembert原理,然后给出变质量力学系统的高阶万有DAlembert原理的各种形式.最后,给出一例说明本文结果的应用.     

Discovery of Late Paleozoic retrograded eclogites from the middle part of the northern margin of North China Craton

The northern margin of the North China Craton (NCC), located between the Paleo-Asian Ocean tectonic region on the north and the NCC on the south, is a key region for studying the tectonic evolution of NCC. A Pre-cambrian retrograded eclogite (2500 Ma or 1800 Ma) was reported in Baimashi near Hengshan Mountain in the NCC, which is characterized by the vermicular symplec-tite of diopside and plagioclase with absence of ompha-cite[1,2]. In Hongqiyingzi Group from the middle part of the …     

Bioturbation in near-surface sediments from the COMRA Polymetallic Nodule Area：evidence from excess ^210Pb measurements

In order to evaluate bioturbation in sediments from the COMRA Polymetailic Nodule Area in the northeast tropical Pacific, excess ^210Pb profiles in sediments cores collected with multiple corers during R/V DAYANGYIHAO Environmental Program Cruise in 1998 were measured by direct gamma assay using Ortec HPGe GWL series well-type coaxial low background intrinsic germanium detectors. A steady-state diffusion model of excess ^210Pb profiles suggests that bioturbation mixing depths and biodiffusion coefficients are 16 cm and 2.75 cm2/a in East Zone, and 6 cm and 0.26cm^2/a in West Zone, respectively. Furthermore, the observations of macrofauna and measurements of total organic carbon (TOC) content in sediments suggest that bioturbation is directly controlled by species and abundance of benthic fauna, such as polychaete, and the bioturbation mixing depth and intensity are positively correlated with the organic matter content.     

Barite in omphacite-hosted K-feldspar ＋ quartz polycrystalline aggregates from the Sulu eclogites and its implications

K-feldspar quartz polycrystalline aggregates were found as sub-millimeter-size inclusions with a pseudomorph after coesite (?) in omphacites from a number of Sulu eclogites. In these aggregates, round or subhedral barites occur as tiny inclusions in either K-feldspar or quartz. Energy dispersive spectroscopy (EDS) analyses show that these barites have (1) 33.86%―41.12% SO3, 0%―34.65% SrO, and 24.12%―63.55% BaO, (2) seemingly negative linear correlations between SrO and BaO, indicating that they are ideal solid solutions of barite (BaSO4) and celestite (SrSO4), and (3) highly variable Sr/Ba molar ratios ranging from 0 to 2.1. Presence of barites in the Sulu eclogites not only indicates oxidation of the subducting continental crust, but also very limited and restricted fluids pre- sented during exhumation of the Sulu UHP eclogites.     

论油脂含量对食品质量的影响

油脂的酸败主要是水解性酸败和氧化性酸败。水解性酸败是油脂的脂肪酸甘油脂水解后产生游离脂肪酸而使酸价上升,氧化性酸败是油脂中不饱和脂肪酸自动氧化产生过氧化物。所以,酸价和过氧化值是评价油脂酸败的重要指标,同样也用于测定食品中所含油脂的酸败程度。     

干旱区湖泊沉积物代用指标意义——猪野泽表层沉积物样品为例

于猪野泽古湖盆南北向中心线及湖盆边缘东北部两个区域内采集表层沉积物样品共45个,既包含来源于地表径流的沉积物,也有在湖泊内部形成的沉积物.分别对其粒度、TOC、w(C)/w(N)及δ13C等分析后发现猪野泽表层沉积物颗粒随地势自高向低逐渐变细,且沉积物中的TOC和w(C)/w(N)逐渐升高,δ13C则相反.据此可知,猪野泽古湖泊表层沉积物的粒度及地球化学指标特征符合干旱区内陆河终端湖泊沉积物千年尺度上的一般规律,故可使用这些指标推测猪野泽古湖泊的水动力条件和湖面水位等.     

叠溪古堰塞湖地震扰动沉积物特征

探讨湖相沉积物的粒度特征,研究大地震发生的周期。岷江上游叠溪古堰塞湖沉积物中保存了大量气候环境信息和地质环境信息。通过地面调查、岩心观察、粒度测试分析加以测龄、环境气候分析的方法,对叠溪古堰塞湖全断面岩心中具有明显扰动特征的扰动层及其下卧层(下接触层)土壤进行分析。结果表明,岩心中存在10个明显的扰动层,其扰动现象与叠溪古堰塞湖地表出露的扰动现象一致。扰动层粒度总体上大于其下卧层(下接触层)。扰动层沉积物的平均粒径(d50)在0.006 8~0.010 7mm,大多数为0.008mm左右。扰动层的粉粒含量波动较大,其下卧层粉粒的质量分数大多在64%左右;相对应黏粒的质量分数,扰动层多在33%左右,而其下卧层波动较大。这些扰动层与下卧层的特征反映了湖相沉积物在沉积过程中受到外力影响而发生的变化。结合测龄资料,初步推测大地震发生的周期大约是850a。     

针对易变质产品的边际回购策略分析

针对易变质产品残值小的特点,考虑制造商对过期产品数量的不同态度,提出了一种新的回购策略--边际回购策略.分析了当制造商采取边际回购策略时,制造商的决策(产品批发价格和回购价格)和零售商的决策(产品销售价格和订货量).研究发现,通过采取边际回购策略制造商和零售商的收益都有所增加,也提高了整个供应链的利润.数值实验还显示,相比固定回购策略,边际回购策略能够减少需求不确定带给制造商的风险.     

辽宁岫岩透闪石质河磨老玉中石墨的成因及其指示意义

石墨常出现在岩浆作用、变质作用及热液蚀变交代作用过程中,是成岩成矿物理化学条件的指示性矿物。辽宁岫岩透闪石质玉、特别是其中河磨老玉(子料)中常常含有大量的石墨,目前,对这些石墨形成条件及其与闪石质玉石成因联系知之甚少。通过显微岩相学、拉曼光谱和X射线单晶衍射等分析,探讨了辽宁岫岩河磨老玉中石墨与透闪石质玉矿的成因联系。河磨老玉中的石墨呈条带状、星点状和云雾状3种分布形态,计算获得的石墨化度值在0.562~0.644之间,菱面体多形含量变化在19.52%~23.00%,温度范围为454~623℃,与角闪岩相变质峰期温度基本一致,明显高于前人获得的透闪石质玉的形成温度范围。结果显示,河磨老玉中的石墨与闪石质玉石是不同地质作用产物。结合野外地质产状,推测河磨老玉中的石墨形成早于闪石质玉石,是区域变质作用形成的变质残余矿物。透闪石质河磨老玉石墨的特征暗示辽河群含石墨方解石大理岩、含石墨的透闪变粒岩、透闪岩大理岩可能是河磨老玉主要的原岩,而透闪石玉是多期次/阶段成矿作用产物。     

海洋细菌具备特殊生物感应能力

在科幻电影《阿凡达》中,生活在潘多拉星球上的纳威人能够将自己的神经束与该星球上的所有生命元素进行连通,其中包括磷光植物和像翼龙一样的鸟类。最新研究显示,地球上也具有像《阿凡达》中类似的互连感应生态系统,一种生活在海底泥泞沉积物中吞食硫磺的细菌就具备特殊的生物感应能力。目前,丹麦奥尔胡斯大学的彼得·尼尔森和他的研究小组发现了支持这一颇具争议理论的有力证据。