往复潮流作用下推移质粒径趋势形成模拟初探

粒径趋势分析是一种用于判断海洋环境中沉积物净输运方向的方法,但是至今粒径趋势形成的物理机制尚不够清楚,因而影响了粒径趋势分析适用条件的确定。针对这个问题,本文通过建立一维、推移质、往复流（近岸潮流）条件下的数值模型,采用正演方法模拟粒度参数在输运方向上的分布．以评价沉积动力过程的影响,初步探讨粒径趋势形成的物理机制。数值模型实验的初步结果显示,水动力条件的空间差异导致的沉积物粒度参数的空间分布符合粒径趋势分析的假设,粒径趋势分析中定义的两种粒径趋势可由沉积物输运强度的空间梯度而形成,并且在沉积物净输运方向上出现的频率最高。     

The future is now! Extrapolated riskscapes,anticipatory action and the management of potential emergencies

Anticipating the future is a key practice for the management of potential emergencies. Anticipatory action needs the future to become ready-to-hand. Focusing on the logics and practices of anticipatory action the paper discusses the relations between time and space in the context of risk and uncertainty. Spatializations of simulation technologies, preemptive emergency management and anticipatory action aim to disclose and extrapolate the future. In general, infrastructures are technologies which aim to materialize expectations concerning the future. In the case of emergency management infrastructural measures enable and/or constrain practices by inheriting specific logics.The concept of riskscapes (Müller-Mahn and Everts, 2013) poses to be a promising framework to grasp these issues. In our perspective, extrapolated riskscapes treat the future as an already interpreted and symbolically structured world. This involves not only looking at the temporality of riskscapes, but also dealing with geographies of inscribed futurity. Two case studies focusing on emergency management practices of firefighters will be deployed for illustration: the first observes the logics of preemptive emergency management and anticipatory action inscribed into materialities of infrastructures in the context of rail-bound hazmat transports; the second shows how computer simulations for crowded geographies facilitate decision-making and action for policing and crowd management.Instead of treating future in riskscapes as neutral, we highlight the politically situated practices that co-evolve with these technologies and their spatializations. The article discusses the dimension of time within riskscapes to gain a better understanding of the temporalization of space as in simulations and the spatialization of time as in infrastructures of emergency management.     

辽宁北西向断裂构造

辽宁北西向断裂构造发育,通常表现为由多条断裂组成的北西向断裂带,多被中基性岩脉充填。北西向断裂(带)在磁场上主要表现为负磁场带,构成一个完整的北西向磁性块体;重力场则处于布伽重力异常等值线疏密突变带上。北西向断裂(带)具有多期活动的特点,是一组控岩、控矿构造,对金矿的控制作用尤其明显。     

应用旅游地理学在中国的进展

应用旅游地理学是地理学变革时期的产物,是适应旅游业的发展需要,地理学与园林、建筑、旅游等学科相互交叉、渗透的结果。应用旅游地理学研究的中心是区域旅游开发。为了完成这一任务,地理工作者应投身旅游实践中去,发挥地理学的优势,联合其他学科,在旅游开发中做出贡献。     

BIOLOGICAL EXPERIMENT AND CLINICAL TESTS ON MAMMOTROPIC ACTION OF MUYINGLE -A NEW TYPE OF HEALTHFOOD PREPARED FROM MARINE ORGANISMS

Muyingle is a new type of health food prepared from marine organisme. The mammotropic action ofMuyingte was investigated by studying its effect on mammary glands and pituitary glands of lactating miceand the survival rate of suckling mice. The results showed that the mammotropic action of Muyingle wasvery effective.The survival rates of suckling mice were 92.90% for the treated group and 0 for the controlgroup (p<0.01). The weights of mammary gland were 163±51.1mg/10g (weight of mouse)for the treatedgroup and 98.5±18.4 mg/10g for the control group (p<0.01). Histological examinations suggestal thatmammary glands from the treated group were at the secreting stages, while those from the control groupwere at the resting stages. Clinical tests also demonstrated that Muyingle was highly effective in promotinglactation and improving the quality of the puerpera's milk. The efficiency was up to 86.7%.     

Differentiation and magma mixing on Kilauea's east rift zone: a further look at the eruptions of 1955 and 1960. Part II. The 1960 lavas

 New and detailed petrographic observations, mineral compositional data, and whole-rock vs glass compositional trends document magma mixing in lavas erupted from Kilauea's lower east rift zone in 1960. Evidence includes the occurrence of heterogeneous phenocryst assemblages, including resorbed and reversely zoned minerals in the lavas inferred to be hybrids. Calculations suggest that this mixing, which is shown to have taken place within magma reservoirs recharged at the end of the 1955 eruption, involved introduction of four different magmas. These magmas originated beneath Kilauea's summit and moved into the rift reservoirs beginning 10 days after the eruption began. We used microprobe analyses of glass to calculate temperatures of liquids erupted in 1955 and 1960. We then used the calculated proportions of stored and recharge components to estimate the temperature of the recharge components, and found those temperatures to be consistent with the temperature of the same magmas as they appeared at Kilauea's summit. Our studies reinforce conclusions reached in previous studies of Kilauea's magmatic plumbing. We infer that magma enters shallow storage beneath Kilauea's summit and also moves laterally into the fluid core of the East rift zone. During this process, if magmas of distinctive chemistry are present, they retain their chemical identity and the amount of cooling is comparable for magma transported either upward or laterally to eruption sites. Intrusions within a few kilometers of the surface cool and crystallize to produce fractionated magma. Magma mixing occurs both within bodies of previously fractionated magma and when new magma intersects a preexisting reservoir. Magma is otherwise prevented from mixing, either by wall-rock septa or by differing thermal and density characteristics of the successive magma batches. Received: July 10, 1995 / Accepted: October 10, 1995     

青城子矿田高家堡子大型金银多金属矿床成因机制

高家堡子大型金银多金属矿床是近年发现的新类型矿床。地球化学、稳定同位素和稀土地球化学等方面的研究表明,高家堡子金银多金属矿床是多成因复合矿床。元古宙时期,辽东裂谷收缩阶段,产生了火山喷流作用,形成了金银多金属矿源层;韧性剪切作用导致矿源层中分散的金、银、多金属元素产生活化、富集作用,形成了矿脉和矿层;印支—燕山期岩浆作用又使早期形成的矿源层或矿体进一步富集,最后形成矿床。因此,高家堡子矿床属韧性剪切－火山喷流沉积－中低温岩浆热液叠加型矿床。     

黄土中古土壤CaCO3淀积层及其意义

西安东郊黄土中古土壤ＣａＣＯ３和淋滤裂隙等的研究表明,使ＣａＣＯ３发生迁移的水为重力水,ＣａＣＯ３淀积层的顶界代表重力水淋溶亚带的底界,也是重力水发生突变的分界。薄膜水不具淋溶作用,也不会引起ＣａＣＯ３的淀积。由ＣａＣＯ３淀积深度可知,中更新世温湿期降水分配不均,雨季与旱季分明,增加的降水量主要集中在雨季降落;温湿期与冷干期的差别主要在雨季,旱季差异小。     

Researches on the stability of porphyra-334 solution and its influence factors

1　Introduction　Ultravioletradiationisahighlyactivecomponentofsolarspectrum .Ultravioletradiationhasdetrimentaleffectsonlivingthingsexposedtosunlight ,includingthedestructionofDNA ,proteinsandothermolecules(Harm ,1980 ) ,inhibitionofphotosynthesisandgrow…     

混凝土碱-集料反应

碱-集料反应是影响混凝土结构耐久性的主要因素之一,由于其破坏的严重性和难以修复性,被称为混凝土的“癌症”.介绍了碱-集料反应的分类、作用机理、影响因素以及预防措施.