硼酸铝晶须烧结物中硫酸钾的浸溶研究     

高世扬  白延峰 《盐湖研究》1996,4(2):41-48

采用明矾与剧酸反应，在１１５０℃硫酸钾熔盐中合成硼酸铝（Ａｌ１８Ｂ４Ｏ３３）晶须，分别用水，不同浓度盐酸和不同浓度硫酸，在不同温度，不同搅拌速率下对烧结物进行浸溶实验，得到浸溶曲线，对反应产物进行物相鉴定，为硼酸铝晶须制备工艺中最佳条件的选择及硫酸钾回收提供依据。  相似文献   

软钾镁矾复盐的热行为研究          下载免费PDF全文

宋粤华  夏树屏 《盐湖研究》1995,3(1):68-72

通过对合成软钾镁矾（Ｋ２ＳＯ４·ＭｇＳＯ４·６Ｈ２Ｏ）的热分析研究，由软钾镁矾的ＴＧ、ＤＳＣ确定了脱水和分解温度，结合恒温热失重实验给出了脱水过程的热化学反应方程式及其产物的Ｘ－ｒａｙ粉末衍射结果，并得到了各脱水阶段的有关热化学反应的动力学参数ｎ、ｌｏｇＫ０和Ｅ．  相似文献   

大柴旦盐湖的物理化学条件          下载免费PDF全文

高世扬  王建中 《盐湖研究》1995,3(3):16-22

大柴旦盐湖是典型的新类型硼酸盐盐湖，常年性湖表卤水中含钠、钾、（锂）镁的氯化物，硫酸盐和硼酸盐。我们在对湖区气象资料进行收集和整理基础上．应用综合气象学方法进行研究。与此同时，对湖表卤水长观资料和不同时间卤水化学组成进行相图解析，揭示湖水年变化的四边形规律。  相似文献   

硼氧酸盐^11BNMR波谱学研究   总被引：1，自引：0，他引：1       下载免费PDF全文

李军  李武 《盐湖研究》1995,3(4):72-80

系统地总结和讨论了固体硼氧酸盐１１ＢＭＡＳＮＭＲ和硼氧酸盐水溶液１１ＢＮＭＲ波谱学研究结果。对于固体硼氧酸盐１１ＢＭＡＳＮＭＲ谱．虽然可以从中定量计算ＢＯ３与ＢＯ４比值，但因为１１Ｂ化学位移变化小，很难将配位多面体与它们的配位环境相联系，用其作为表征固体硼氧酸盐尚缺少特征性。而对于硼氧酸盐水溶液１１ＢＮＭＲ谱，由于在ＮＭＲ谱仪时间规模下一些硼氧酸盐阴离子中不同化学位置上Ｂ核交换速率影响，在１１ＢＮＭＲ波谱上没有观察到信号。实践证明，溶液１１ＢＮＭＲ波谱与Ｒａｍａｎ光谱的联合使用，将是研究水溶液中硼氧酸盐阴离子结合最直接和有力的手段。  相似文献   

Digging out molecular markers associated with low salinity tolerance of Nannochloropsis oceanica through bulked mutant analysis     

Liang  Sijie  Zhang  Zhongyi  Liu  Hang  Guo  Li  Sun  Shiyang  Yang  Guanpin 《中国海洋湖沼学报》2020,38(6):1867-1879

Journal of Oceanology and Limnology - Nannochloropsis oceanica is a marine microalgal species with both economic value and biological importance. It grows fast, contains rich oils, reproduces...  相似文献   

乳山湾的污染与异养微生物的调查分析     

陈世阳  包文雅  李八方  刘树青 《中国海洋大学学报(自然科学版)》1987,(4)

于1985年5—10月定期采取了乳山湾内和岸边养虾池的水样及底泥进行了异养微生物的分析。菌数的平均值池内高于湾内,其最高值和水中COD的最高值同时出现在养虾旺季的8月份。在湾泥和池泥中的硫酸盐还原菌数均高达10~6个/克以上,与同期内硫化物的最高含量(326mgS/kg)相一致。并发现病原性弧菌也广泛存生。异养菌种群的组成,假单胞杆菌占有最大的比值,反映出该水域为污染类型。上述结果表明该湾的水质条件已远超出国家渔业水质标准,呈现高度的有机物污染状态,其污染源与湾边周围开展大面积的养虾有关。  相似文献   

The response law of far-field seismic ground motion of the Wenchuan earthquake and its damaging mechanism in the Loess Plateau     

Xiaowu Pu  Lanming Wang  Ping Wang  Xiufeng Tian  Shiyang Xu  Shaofeng Chai  Haitao Guo 《地震研究进展（英文）》2022,2(3):100114

A series of housing collapses and other serious damage was caused by the 2008 Wenchuan M_S 8.0 earthquake in the seismic intensity Ⅵ areas of the Loess Plateau, which is hundreds of kilometers away from the epicenter, and which showed a remarkable seismic intensity anomaly. The seismic disasters are closely related to the seismic response characteristics of the site, therefore, the systematic study of the far-field seismic response law of the Wenchuan earthquake in the Loess Plateau is of great significance to prevent the far-field disaster of great earthquake. In this paper, the seismic acceleration records of several bedrock stations and loess stations from the seismogenic fault of the Wenchuan earthquake to the Loess Plateau were collected, and the attenuation law of ground motion along the propagation path and the characteristics of seismic response on the loess site are studied, and the mechanism of amplification effect of ground motion is analyzed based on the dynamic feature parameters of the loess site obtained through the HVSR method. Taking a typical loess site of thick deposit as the prototype, a series of shaking table tests of dynamic response of loess site models with different thicknesses were carried out. Amplification effect, spectral characteristics of acceleration in model sites were analyzed under the action of a far-field seismic wave of the Wenchuan earthquake. The results show that seismic attenuation on the propagation path along the NE strike of the seismogenic fault to the Loess Plateau is slower than that in other directions, and the predominant period range of ground motion on bedrock site of the Loess Plateau presents broadband characteristics. Because the natural periods of loess sites with thick deposits are within the predominant period range of bedrock input wave, loess sites appear significant amplification effect of ground motion, the horizontal acceleration of ground motion exceeds 0.1 ?g, the seismic intensity reaches 7°. The thicker the loess deposit is, the more significant the change of spectral characteristics of ground motion on loess sites, and the narrower the predominant period range of ground motion becomes, and the closer it is to the natural period of loess sites. Therefore, for some old houses on thick loess sites, the poor seismic performance and strong seismic response eventually led to their collapses and damages because their natural periods are very close to the predominant period of ground motion of the Wenchuan earthquake on thick loess sites; For these damaged high-rise buildings, the resonance effect might be the main reason for their damages because their natural periods are included in the predominant period range of ground motion of the Wenchuan earthquake on thick loess sites.These research results would provide a basis for seismic disasters prediction and evaluation and seismic design of construction engineering in the Loess Plateau.  相似文献   

第17届世界地震工程大会岩土地震工程相关领域研究进展综述          下载免费PDF全文

柴少峰  王兰民  蒲小武  许世阳  马星宇 《地震工程学报》2022,44(6):1332-1344

第17届世界地震工程大会于2021年9月27日至10月2日在日本仙台召开.考虑新冠疫情,此次大会的举办采取线上与线下结合的方式,笔者线上参加了会议.论文简要介绍此次大会的概况,通过分析大会相关交流报告和论文内容,对岩土地震工程研究领域的砂土液化灾害、地震作用下斜坡破坏、土G结构相互作用、地面破坏及场地地震安全、地面运动5个分会专题的研究进展进行综述.以期与国内同行分享本次大会在岩土地震工程及其我国有重大需求相关领域的最新成果和发展趋势.  相似文献   

深圳市流感就诊率季节特征及夏季流感就诊率气象预报模型     

翟红楠  张莉  孙石阳  覃军  陈正洪 《气象科技》2009,37(6):709-712

利用深圳市2003-2007年5年的流感样病例资料和同期气象资料,对深圳市夏季流感与气象条件的关系进行了分析与统计。研究发现深圳市流感高峰期发生在春季和夏季,且存在向夏季转移的趋势,这种流感流行的季节差异与天气条件有很大的关系,受气温、相对湿度的影响显著,在平均气温处于25-30℃之间,相对湿度较高的天气条件下易出现流感高峰。用最低气温、最小相对湿度和日照时数为预报因子,建立了深圳市夏季流感就诊率的等级预报模型。  相似文献   

Characterization of intermittent chaos and oscillating frequencies in some pulsating stars     

Fusheng Chen  Jiulin Du  Shiyang Jiang 《Astrophysics and Space Science》1994,218(1):101-111

If one zone models are available for some pulsating stars and the motion remains close to adiabaticity, we show the existence of odd frequencies in the power spectrum of these pulsating variable stars, and the frequency of free oscillation thus becomes dependent on the amplitude. We find 3 appearing in the power spectrum of the white dwarf PG 1351+489. Furthermore, the intrinsic stochasticity in the basic equations describing the structure of stars is discussed in this paper. We found that the pulsation of intermittent chaos can occur spontaneously in the basic equations of a star within certain intervals of values of its control parameters, and the intermittency can be used as an interpretation of pulsation in variable stars.  相似文献