单排井柱桩透水丁坝的分水缓流作用效果

为了验证井柱桩透水丁坝的分水缓流作用效果,建立单排井柱桩透水丁坝运行时的水量平衡方程,导出了单排井柱桩透水丁坝上下游流速公式。以塔里木河三号口断面建单排井柱桩透水丁坝为例,计算单排井柱桩透水丁坝上下游流速值并进行比较,结果表明,井柱桩透水丁坝下游流速较上游流速显著降低,与实际效果相符。

胜利埕岛中心二号平台三相分离器分水试验研究

目前,胜利海洋埕岛油田进入了高含水开发期,根据埕岛油田"十三五"规划,需要重新确定中心平台的分离器分水规模。针对中心二号平台已建三相分离器,采用室内热化学沉降试验及现场分水试验相结合的方法,确定了其合理的破乳剂投加浓度和分水量。在确定分离器的分水能力时,应根据室内热化学沉降脱水试验结果及现场情况综合确定,通常室内试验结果会明显优于现场效果,对于胜利埕岛及类似油品性质的油田,可按照理论分水量的0.5倍来确定分离器的分水量。

Concentration variations of several ions in stream after a wildfire

In May 2006, a high intensity wildfire occurred in Songling forest region in Daxing＇an Mountains, China. The concentration changes of eight ions （K^＋, Na^＋, Ca^2＋, Mg^2＋, Cl^-, Br^-, NO3^- and SO4^2-） were measured in burned and tmbumed streams after fire from May to Oct., 2006. Results show that the most ions flux were higher in burned stream than that in unburned stream during the sampling period, and the greatest concentrations of most ions transported from burned stream occurred in July. After fire, the most amplitude chemical ion was Ca^2＋, whose average concentration was 5.50 mg·L^-1 higher than that in unburned stream, and the total concentration of every chemical ion presents a trend Ca^2＋〉SO4^2- 〉Na^＋〉Mg^2＋〉NO3^- . The average concentrations of Ca^2＋, SO4^2- , Na^＋＇Mg^2＋,NO3^- showed an increase trend, but those of K^＋, Cl^- , Br had a decreased trend. SO4^2- had the largest loss among these anions, followed by NO3^-. Overall, the increase degree of cation was greater than that of anion after burning.

Effect of bubbles addition on teetered bed separation

To improve the separation efficiency of a conventional Teetered Bed Separator(TBS) in beneficiation of fine coal with a wide size range,an Aeration TBS(A-TBS) was proposed in this investigation.The bubbles were introduced to A-TBS by a self-priming micro-bubble generator.This study theoretically analyzed the effect of bubbles on the difference in hindered settling terminal velocity between different density particles,investigated the impact of superficial water velocity(V_(SW)) and superficial gas velocity(V_(Sg)) on bed fluidization,and compared the performance of the TBS and A-TBS in treating 1-0.25 mm size fraction particles.The results show that the expansion degree of fluidized bed which was formed by different size particles or has different initial height,is increased by the introduction of bubbles.Compared with the TBS,at the same level of clean coal ash content,the A-TBS shows an increase in the combustible recovery of clean coal,ash content of tailings,and practical separation density by 5.26%,6.56%,and 0.088 g/cm3 respectively,while it shows a decrease in the probable error(E_p) and V_(SW) by 0.031 and 3.51 mm/s,respectively.The addition of bubbles at a proper amount not only improves the separation performance of TBS,but also reduces the upward water velocity.

Effect of Stirring on Oil-Water Separation in Rare Earth Mixer-Settler

Oil-water separation is critical to solvent extraction process of rare earth, which can directly affect the yield and quality of the product. The experiments measure the two-phase separation time in a beaker, mixing uniformity of two phases in the mixer and the oil phase entrainment at oil exit by the Karl Fischer method and numerical simulation for the mixersettler to study the combined effect of gravity and stirring. Experimental results show that relative to the static situation, the separation efficiency resulted from low-speed stirring is increased by 25%. The water content in the oil is a minimum at an offset distance L of 10 cm and the clearance off the tank bottom z of 10 cm is as low as 0.49%. Distribution images of oilwater separation at 2 s indicates that stirring is very conducive to the separation of the oil-water phase.

Control Effect of 80% Nicosulfuron·Atrazine Water-dispersible Granules on Weeds in Spring Maize Field

[Objective] This study aimed to investigate the control effect of different concentrations of 80% nicosulfuron·atrazine water-dispersible granules on weeds in spring maize field. [Method] Maize field was sprayed with 300, 375, 450, 750 g/hm280% nicosulfuron·atrazine water-dispersible granules respectively, with 40 g/L nicosulfuron suspending concentrate and 38% atrazine suspending concentrate as control agents. Artificial weeding and control(CK) plots were set. [Result] Fresh weight control efficiency of 375-750 g/hm280% nicosulfuron·atrazine water-dispersible granules was significantly higher than that of 40 g/L nicosulfuron suspending concentrate and 38% atrazine suspending concentrate; no obvious phytotoxicity symptoms were observed after application of 300-450 g/hm280% nicosulfuron·atrazine waterdispersible granules; 750 g/hm280% nicosulfuron·atrazine water-dispersible granules posed certain impact on the growth of maize seedlings. Compared with control plots, various doses of 80% nicosulfuron·atrazine water-dispersible granules significantly improved the yield of maize. [Conclusion] In the present study, 375-450 g/hm280% nicosulfuron·atrazine water-dispersible granules exhibited high control effect on weeds in maize field and were safe for the growth of maize seedlings.

Who Populates the Visual Landscape of the ELT Coursebooks？： A Photo Analytical Exploration

The aim of this study is to portray and explore the variety of social actors depicted visually along the pages of the intermediate level ELT coursebooks that are published locally （by British and American publishers） and marketed globally （mostly to the EFL contexts）. For this, a thorough photo-ethnographic exploration of the visuals supported by the inventory of ＂social actor interaction network＂ is employed. In the field of Coursebook Analysis, visuals have attracted limited attention despite marking asocio-semiotically rich discursive field. In fact, the semiotic labor division between the ＂word＂ and the ＂image＂ in representing and reconstructing （simulating） the world, points to a gain on the part of the image as the brain is evolutionarily more experienced in processing visual information than processing verbal information. Therefore, images can appeal more directly to the sensory experience domains of the viewers via visual contact, evoking deeper consciousness. Acting as the prominent mediators of signification practice, visuals catalogue the representations and simulations of social-life viewed l^om a particular subject position associated with a particular set of norms, beliefs, and values. Hence, they position the viewers across dynamic loci of subjectivities in terms of social distance, relations, and interaction. As both reflections and reproductions of reality, images in the coursebooks have the potent to influence learners＇ perspectives of the world presenting them with readymade cognitive schemes. In order to reveal a comprehensive picture of the visually depicted social actors and the identity options made available through them, in this study the author focused on the peopled photos of the 6 popularly traded ELT coursebooks. The author investigated them regarding the relations of social distance, involvement, power and interaction formed between the depicted social actors and their viewers as well as the emergent practices of exclusion, role allocation, genericization, specification, assimilation, individualization, and categorization. The results show that the representational repertoires of the coursebooks contain disproportionately distributed visual depictions of social actors in terms of cultural orientation and gender. The ＂culturally different＂ are repeatedly pictured in assimilative ways as an aggregate of enumerable people, while the social actors of the reference group are usually pictured individually and with their own intended meaning.