高三复习冲刺阶段的教学策略

一、近年地理高考试题趋向。1．强化地图载体，考查读图用图技能。地图是地理信息的载体，也是学生学习地理不可或缺的工具，因此，地理高考理应检测这一最重要的学习能力，重点考查学生学习地理的过程。从试题设计上来凸现过程性评价，正符合新课程标准理念。一般说来，学生平时对较简单的区域图、统计图、景观图掌握较好，但有几种难图需加强读练：     

新课程实施中的课堂提问案例分析

高效的教学的本质是良好的师生交往互动，交往、互动皆因“问题”而起，倘若教学没有了“问题”，互动也就不存在了。“问题”是形成教学过程中师生双方相互交流、相互沟通、相互理解、相互启发、相互补充的桥梁，是提高教学质量的关键。     

地理课堂教学中实现师生互动初探

新的课程理念强调：教师是学生学习的合作、引导、参与。教学过程是师生交往共同发展的互动过程，那么在地理课堂教学中如何实现师生互动，彼此形成一个真正的互教互学的学习“共同体”呢？笔认为应做到以下几点：     

紧急征集有关“地图”内容的游戏和交互性练习软件

当前，我国一些地方在推进城市化过程中，盲目追求速度快、规模大，土地利用规划存在一定的盲目性，其制定的未来的城市发展规划往往存在“小脚穿大鞋”的现象，造成土地的闲置浪费。     

热带风暴热力非对称结构对其运动的影响

研究了热力非对称结构对0421号热带风暴"海马(Haima)"的移动和强度变化的影响。通过物理量场诊断分析发现,热带风暴(气旋)的热力结构在垂直、水平方向均呈非对称分布。热力因子对热带风暴的影响,主要体现在低层。热带风暴朝其移向前方的风暴内部的非绝热增温中心偏折,并有向此方向加速的趋势。了解热带风暴的热力结构分布特征及其对热带风暴移动的影响,对短期预报热带风暴的移动有一定的指示意义。     

Low-temperature alteration of oceanic island basalts and their contribution to transition metal circulation of the ocean

The major elements, rare earth elements （REE） and trace elements of four basalt samples from central and western Pacific ferro- manganese crust provinces have been analyzed using chemical methods and ICP - MS, respectively. The results indicate that the samples have been extensively altered and that the contents of their major elements have changed significantly. However, the similarity of REE partition patterns and trace element contents of basalt samples to those of fresh oceanic island basalts （OIB） indicate that the basalt samples originated as OIB. Because of low-temperature alteration, the contents of A1203 , Fe203 , MnO, K20 and P205 increased, while MgO and FeO decreased. Active components, such as magnesium and iron, were leached from OIB resulting in the relative enrichment of SiO2. The leaching of active components can cause the relative enrichment of REE, while the precipitation of LREE-rich ferromanganese oxides in vesicles and fissures not only causes an increase of REE contents, but also induces ＂fractionation＂ of LREE and HREE. Based on the enrichment mechanism of REE contents, the theoretical quantities of precipitated ferromanganese oxides and the depleted quantities of active components are calculated ： the depleted quantities of active components for the unit mass of fresh basalts vary in the range of 0.15 ～ 0. 657, and the precipitated quantities of ferromanganese oxides for the unit mass of fresh basahs vary in the range of 0. 006 ～ 0. 042. Of the major elements, the two most depleted are iron, and magnesium, with 18.28% ～ 70.95% of iron and 44.50% ～ 93.94% of magnesium in the fresh basalts was leached out. Theoretical calculation and geochemistry results both indicate that low-temperature alteration of basalts can supply abundant amount of metals to seawater, and may play an important role in ocean metal circulation.     

Natural thermoluminescence of fossil foraminiferals as a potential proxy for deep-sea temperature changes

Foraminiferal shells from two piston cores separately located at the Ninetyeast Ridge and the Bengal Fan of the Indian Ocean were selected and purified for measurements of natural thermoluminescence （NTL） intensity by a high precision thermoluminescence meter （RGD-3）. Variations of the NTL intensity along the two core sequences both spanning the last two glacial--interglacial cycles displayed a strong, identical signal of the global ice volume cycles, which matched well with their corresponding oxygen isotope data. As higher NTL intensity occurred within interglacial periods and changes in an NTL signal were most likely influenced by the temperature of ambient seawater in which the planktonic foraminiferal shells long existed, the NTL signal could be considered as a potential proxy for orbital scale temperature changes of bottom seawater in the tropical Indian Ocean.     

江西省天气、气候特点及其影响评述(2007年10-12月)

2007年10-12月,江西省出现大雾的日数(全省每日15站以上的大雾)共有3 d(表1),与常年相比明显偏少.其中11月20日为江西人秋以来范围最大、持续时间最长的大雾天气过程,全省共44个县(市)出现大雾,其中27个县(市)能见度小于500 m,万载、上饶、德兴等6县(市)能见度不足100 m.     

黔西南册亨板其磷矿矿石结构与成矿过程

在矿床分类中并未对洞穴堆积磷矿床的矿质沉淀过程及制约因素进行分析。本文通过显微镜结合双束扫描电镜对贵州板其磷矿矿石结构研究中发现,洞穴堆积磷矿床矿物组成成分有磷灰石、菱锰矿、软锰矿、少量的菱铁矿、自生石英及方解石等,矿石主要为胶状结构,条带状、栉壳状及蜂窝状构造。板其磷矿矿物构造特征与潜水带喀斯特溶洞内的微型流水石具有极其相似的特征,推测洞穴堆积磷矿床中磷质及锰质的沉淀实际为水介质pH值的变化导致其溶解度变小而析出的过程。与钙华形成机制对比后,将因水介质pH值变化后导致磷质析出的磷灰石命名为"磷华"。