Comparative Analysis of International Energy Consumption Characteristics and China's Countermeasures     

Yang Zhanhong  Lü  Lianhong  Cao Bao  Wang Xiao  Luo Hong 《地球科学进展》2016,31(1):94-102

With the rise of low carbon economy and the deterioration of the international energy situation, most countries in the world pay more attention to energy issues. In this paper, based on a comparison with several countries of large energy consumption, we used long sequence statistics to analyze the energy consumption characteristics from the world and the history, including energy consumption, energy consumption structure and energy efficiency, and then summed up the characteristics of energy consumption in developed countries, analyzed China's energy consumption process and the current stage, and found out the main problems of energy consumption in China. At last, countermeasures for the healthy development of China's energy were proposed, including actively promoting scientific and technological progress, upgrading energy structure, developing low carbon economy, rationalizing energy prices, improving the proportion of clean energy consumption and emphasizing synergistic effect on environment protection.  相似文献   

新疆罗布泊超大型卤水钾矿发现20年     

宣之强 《化工矿产地质》2016,(1):60-64

"罗布泊超大型卤水鉀矿"的发现,是中国众多地学科学家40年探寻预测的。王弭力研究员及其团队,于1995年秋首次踏进罗布泊"罗北凹地",当年找到4356万t优质卤水鉀矿;经五年科研和勘探,查明儲量达2.5亿t、为超大型卤水鉀矿。理论创新,成为完成科硏和勘探的关键,加速了百万吨级"罗钾公司"硫酸钾肥生产成功投产。古丝绸之路上生命回归、一颗新星"罗布泊"镇诞生,"百年罗钾"资源保障科研探钾即将启动,中国几代"钾盐人"的梦想成真。  相似文献   

Investigation of a longfin inshore squid's swimming characteristics and an underwater locomotion during acceleration     

《Applied Ocean Research》2016

In the present study, locomotion of a real longfin inshore squid (Doryteuthis pealeii) was numerically investigated. Geometry of a real squid was obtained using computed tomography (CT) images. In addition to a two-dimensional axisymmetric squid model, a modified squid model with no cavities around her head and an ellipse shaped model were generated with a fineness ratio (the ratio of body length to maximum body diameter) of 7.56. These numerical models were exposed to an acceleration with two different velocity programs. Added mass and basset forces on bodies were calculated during acceleration of the squid models starting from rest. Pressure and viscous drag forces were also calculated due to pressure variation along the squid models and friction on the surface of the models. The effect of a nozzle diameter on jet velocities and propulsive efficiency at all bodies were evaluated when time dependent velocity profiles (from 0 to 10 m/s in 0.5 and 1 s time durations) were set for the inlet of computational domain. The modified squid model required least thrust force during acceleration phase of time dependent velocity profile compared to the other models while the 0.02 m nozzle diameter provided largest propulsive efficiency for all models.  相似文献   

Effects of heavy metal (Pb) concentration on some growth parameters of plants grown in lead polluted soil under organic fertilizer amendment     

Ojo M. Oseni  Adekunle A. Adelusi  Esther O. Da  Abdulfatai B. Rufai 《寒旱区科学》2016,8(1):36-45

This study investigated morphological variation and biomass accumulation that occurred in Sida acuta and Chromolaena odorata plants grown in lead polluted soil under organic fertilizer amendment. The study was carried out in the screen house at the Biological Gardens of the Obafemi Awolowo University, Ile-Ife, Osun State. The experiment was a factorial combination of one heavy metal (Pb) at five levels of concentration (0, 200, 400, 800 and 1,000 mg/kg) in a completely randomized design, and were replicated three times for each of the two plants and two levels (0 g/kg and 9.4 g/kg) of organic fertilizer (OBD-Plus). Each pot was filled with 5 kg of air-dried and sieved soil and placed on a plastic tray for the collection of excess water. Two weeks after planting, seedlings of uniform height were transplanted from the nursery to experimental pots at the rate of one seedling per pot and grown for 10 weeks. The growth parameters of the plants were biomonitored for 7 weeks. After 10 weeks of treatment, the plants were harvested and dried to calculate the biomass accumulation. The two plant species performed better under fertilizer application than without it. For each of the plant species the growth parameters decreased as the levels of Pb concentration increased. Furthermore, the plants' biomass decreased significantly (p<0.05) as the levels of Pb concentration increased. The organic fertilizer helped to improve the plants' performance in lead-polluted soil.  相似文献   

空气潜孔锤钻进技术在舜皇山基岩地热深井的应用          下载免费PDF全文

石荆京  张海林  苏园园  胡志航  郑秀华 《探矿工程》2021,48(10):36-42

空气潜孔锤钻进技术不仅可以提高钻探效率,而且不损害地热储层,因此在地热井中的应用十分广泛,但是仍受到钻探深度和出水量的限制。在湖南永州舜皇山基岩地热深井钻探过程中,常规牙轮钻进与泥浆钻进工艺存在钻进效率低、堵塞储层、影响出水量的可能。应用空气潜孔锤钻进技术实现了钻探深度的突破,钻探深度达到1820 m,实际出水量400 m³/d,出水温度43 ℃,符合设计指标。本文总结了相应的钻进工艺措施,以期促进对该技术在地热深井中的推广应用。  相似文献   

三江源区大气可降水量时空特征及其与降水关系     

强安丰  汪妮  解建仓  姜仁贵 《干旱气象》2019,37(1):22-30

利用1979—2016年欧洲中期天气预报中心(ECMWF) ERA-Interim (1°×1°)再分析资料中的经、纬向水汽通量和大气可降水量(precipitation water vapor,PWV)数据,采用相关性分析、趋势分析法、累积距平、IDW等方法,分析三江源地区PWV与水汽通量的时空分布特征、降水转化率(precipitati-on conversion efficiency,PCE)变化规律。结果表明:过去的38 a,经、纬向多年平均水汽通量分别为50. 2、196. 7 kg·m-1·s^(-1),纬向水汽通量气候倾向率比经向大。南边界为纬向主要水汽输入边界,东边界为经向主要水汽输出边界,纬向水汽输送大于经向输送。多年平均PWV为1998. 3 mm,近38 aPWV呈现微弱增加趋势,1979—1997年,PWV呈下降趋势,1998年后PWV呈增加趋势,同期降水也在增加,说明该时段三江源地区气候转湿。PWV与水汽通量的年际变化趋势和转折年相一致。三江源区多年平均PCE为24. 57%,1989年PCE最高,达32. 76%,各季节平均PCE空间分布与年平均PCE分布一致,均表现出南部、东南部高,西部、东北部低的变化特征,各季节PCE大小差异明显,春季多年平均PCE为15. 92%,夏季25. 67%,秋季21. 01%,冬季仅7. 03%。  相似文献   

氯化钡法在盐湖高锂卤水中高效分离硫酸根的研究          下载免费PDF全文

马丽  孟永涛  毕秋艳  房晓宇  关云山 《盐湖研究》2021,29(3):68-75

在生产碳酸锂的工艺中,尤其除硫过程中,锂会伴随其它盐类析出,造成锂的大量夹带损失.因此盐湖高锂卤水中硫酸根的脱除对锂的高效富集,提高锂的收率有重大意义.研究以盐湖高锂卤水为原料,通过加入氯化钡,采用化学沉淀法除去卤水中的SO2-4.详细考察了原料配比(SO2-4与Ba2+的摩尔比)、加料方式、加料时间、反应时间、搅拌速...  相似文献   

Experimental study on the effect of bottomless structure in front of a bottom outlet on a sediment flushing cone     

Hadi Haghjouei  Majid Rahimpour  Kourosh Qaderi  Sameh AKantoush 《国际泥沙研究》2021,36(3):335-347

One of the main problems in reservoirs is sedimentation which reduces the operating life of dams if a proper plan and analysis method are not in place.The techniques to manage sediment in reservoirs include several sustainable management techniques that route sediment through or around the reservoir.One of the main economical methods in arid and semi-arid regions is pressurized flushing using moderate drawdown of the water level of the reservoir to evacuate sediment deposited behind dams.In the current study,the effect of a new structure called a dendritic bottomless extended(DBE)outlet structure at three angles of 30°,45°,and 60°
on pressurized flushing efficiency was investigated.Consequently,45 experiments were designed for three discharge rates (Qo),three sediment levels(Hs),four types of structure,and a no-structure condition(reference test).The results indicated that the DBE structure with a 30°angle between the branches,a sedimentary dimensionless index of Hs/Do=4.59,and a flow dimensionless index of Qo=/√gD05=1:43(where g is the acceleration of gravity and Do is the diameter of the bottom outlet)lead to 10-fold increase in the sediment flushing cone dimensions and sediment removal efficiency compared to the results of the reference test.Finally,according to a statistical analysis of the results,a dimensionless equation for calculating the sediment flushing cone dimensions was developed for the tested sediment characteristics.  相似文献   

收缩城市建设用地利用效率时空分异及影响机制——以黑龙江省伊春市为例   总被引：1，自引：1，他引：0  

徐惠孝  刘艳军 《地理科学进展》2021,40(6):937-947

建设用地是城镇经济社会活动的空间载体,其利用效率是调控建设用地扩张和配置的重要基础.论文以收缩型城市——黑龙江省伊春市为例,利用DEA模型测算了1995-2015年伊春市建设用地利用效率分析其时空演变规律,并运用地理探测器模型探究伊春市建设用地利用效率空间分异的影响机制,结论如下:①1995-2015年伊春市建设用地利...  相似文献   

周至井水位气压效率和相关系数在中强地震前的变化特征   总被引：1，自引：0，他引：1  

王新  赵小茂  张国强  杨旭升 《华南地震》2007,27(4):61-66

计算了2002～2004年周至井水位的气压效率和相关系数,初步分析了其与地震的关系,认为在2002年甘肃玉门5.9级地震、2003年和2004年甘肃岷县5.2、5.0级地震前,该井水位的气压效率和相关系数同时出现了明显的短临前兆异常。  相似文献