Earth Summit Mission 2022: Scientific Expedition and Research on Mt. Qomolangma Helps Reveal the Synergy between Westerly Winds and Monsoon and the Resulting Climatic and Environmental Effects

“Earth summit mission 2022” is one of the landmark scientific research activities of the Second Tibetan Plateau Scientific Expedition and Research(STEP). This scientific expedition firstly used advanced technology and methods to detect vertical meteorological elements and produce forecasts for mountain climbing. The “Earth summit mission 2022”Qomolangma scientific expedition exceeded an altitude of over 8000 meters for the first time and carried out a comprehensive scientific investigation missi...     

Application of allochthonous organic carbon and phosphorus forms in the interpretation of past environmental conditions

Organic matter in sediments, for instance, carbon, nitrogen and phosphorus, can be used to reconstruct the paleoecological and pollution history of lakes and their catchment basins. In this paper, the contents of allochthonous organic carbon (allochthonous OC) and autochthonous organic carbon (autochthonous OC) in sediment cores taken from Wuliangsuhai Lake and Daihai Lake in northern China are quantified by using a binary model, and phosphorus forms in the sediment cores from the two lakes are extracted by sequential extraction techniques. The results indicate that the palaeoenvironment and paleoclimate of Daihai Lake and its catchment basin in the recent 250 years can be well reconstructed based on the content of allochthonous OC. The climate was relatively humid and warm in the period of 1865–2005, while relatively dry and cold in the period of 1765–1865. The sedimentary information of allochthonous OC in the 22–42-cm portion of the sediment cores in Daihai Lake corresponds to the final cold fluctuation of the Little Ice Age that occurred since the Middle Holocene. The difference of phosphorus forms in the sediment cores between the two lakes indicates that phosphorus input to the lakes and the correlation between phosphorus forms and distribution and the changes of environment are influenced by the eutrophication mechanisms and environmental conditions of the two lakes.     

基于构件的地理信息系统应用软件开发模型研究

构件技术是软件复用的主要发展方向之一，本文在介绍构件及其相关技术的基础上，提出了基于可重用构件的地理信息系统应用软件的体系结构和开发模型，并对其中的基本技术问题作了讨论，解决了在GIS应用软件系统的开发中如何采用构件技术的问题。     

Dinosaur Footprints of Early Cretaceous in Site 1 ,Yanguoxia ,Yongjing Country ,Gansu Province

ＡｆｔｅｒｔｈｅｒｅｐｏｒｔｏｆｄｉｎｏｓａｕｒｆｏｏｔｐｒｉｎｔｓｉｎｔｈｅＥａｒｌｙＣｒｅｔａ ｃｅｏｕｓｉｎ 2 0 0 0 (Ｌｉｅｔａｌ.,2 0 0 0 ) ,ｗｅｆｏｌｌｏｗｅｄｔｏｕｎｅａｒｔｈ ,ｉｎｖｅｓｔｉ ｇａｔｅａｎｄｒｅｓｅａｒｃｈｔｈｅｆｏｏｔｐｒｉｎｔｓｗｉｔｈｔｈｅｓｕｐｐｏｒｔｏｆＮａｔｉｏｎａｌＮａｔ ｕｒａｌＳｃｉｅｎｃｅＦｕｎｄａｔｉｏｎａｎｄＳｔａｄｈｏｌｄｅｒＦｕｎｄｏｆＧａｎｓｕＰｒｏｖｉｎｃｅ.Ａｔｐｒｅｓｅｎｔ ,ｔｈｅｒｅａｒｅｔｅｎｔｒａｃｋｓｉｔｅｓａｂｏｕｔ 2 86ｆｏ…     

三元体系Mg~(2 )/Cl~-,Borate—H_2O25℃相关系和溶液性质的研究

用等温溶解法测定了Mg2+／Cl-，Borate-H2O三元体系25℃时的溶解度．此三元体系等温溶解度图为简单共饱型，它的平衡固相分别为三方硼镁石（Mg2B12O20·15H2O）和MgCl2·6H2O，未产生新的复盐或固溶体。拟合了MgB6O10随MgCl2浓度变化的溶解度曲线方程，并且对平稳溶液的物化性质（密度、粘度、折光率、电导、pH值）进行了测定，用半经验公式描述了一些物化性质随浓度的变化规律，结果令人满意。     

非线性最小二乘平差迭代解法的收敛性

本文讨论了非线性最小二乘平差中高斯—牛顿法和阻尼最小二乘法迭代程序的收敛性问题,找出了影响收敛的因素,给出了估算迭代程序收敛性的方法。     

新疆强震活动的迁移特征

结合新疆构造活动的特点及地震活动的分区,探讨了境内强震活动的迁移特征,结果表明新疆强震活动始于乌恰地区,分别沿南天山西段由南向北迁移和沿西昆仑带由西向东迁移。其迁移方式主要表现为天山带强震活动由低纬向高纬地区成组迁移,各带内次级活动区的往返迁移。研究结果将为判断新疆各区(带)地震活动的趋势及强震危险地区提供依据。     

Palaeogeographic Position of the South China Plate During the Early-Middle Devonian1

Abstract In Guangxi, the Lower- Middle Devonian boundary beds yield abundant corals, brachiopods, stromatoporoids and conodonts. The former three were common in tropical and subtropical zones, while the last occurred only round the equator. This reveals that the South China Plate in the Early-Middle Devonian was at or near the equator, which was also supported by palaeomagnetic study giving the palaeolatitude of the Guangxi Region at the time to be 0 ° 36 ′N.     

苏联斋桑7.3级地震前地震活动的某些特征

1990年6月14日苏联斋桑7.3级强震发生在重力异常梯度带的拐弯处;强震前存在明显的M_s≥3.5级地震围成的空区;空区走向为北西西向,与斋桑强震发震构造走向一致,长轴约170km。1990年2月14日4.0级地震可视为信号震。最后初步讨论了阿勒泰活动区的地震趋势。