猫须草的盆栽技术

近年来,许多花卉盆景在市场上行情逐渐走低,而一些盆栽实用植物却在市场上异军突起,特别是中药材盆景颇受市场青睐。猫须草,又称化石草、腰只草、肾草、肾茶,是唇形科肾茶属多年生草本植物,因雄蕊伸长,外露于花冠,酷似猫的胡须而得名。猫须草盆栽,可在保温塑料大棚、玻璃温室和家庭阳台上栽培,不受南北温差的限制。其观赏价值和药用价值兼备,具有广阔的发展前景。

Reaction kinetics and mechanism of calcium oxide in dilute sodium aluminate solution with oxalate based on lime causticization

The formation kinetics and mechanism of tricalcium aluminate hydrate and calcium oxalate in dilute sodium aluminate solution and sodium oxalate solution were studied respectively based on the lime causticization, and the optimal conditions for removing the oxalate in dilute sodium aluminate solution as well as the mechanism were finally obtained.The formation processes of tricalcium aluminate hydrate and calcium oxalate are mainly controlled by the chemical reaction and the inner diffusion respectively,and the corresponding reaction rate equations as well as the apparent activation energy were calculated. The hydrocalumite with a spatially interleaved structure will form in dilute sodium aluminate solution with sodium oxalate, greatly removing the oxalate impurity by absorption. Calcium oxalate can be converted to tricalcium aluminate hydrate with the increasing reaction time. The oxalate causticization efficiency and the alumina loss rate can be over 90% and below 31% respectively when reacted at 50℃ with a stirring rate of 200 r/min.

Activation flotation and mechanism of lime-depressed pyrite with oxalic acid

Flotation tests, contact angle measurements, infrared spectrum analyses, X-ray analyses and computer simulation were carried out in order to study the activation mechanism of lime-depressed pyrite with oxalic acid. The results show that the oxalic acid effectively eliminated the hydrophilic calcium film from the surface of pyrite. Therefore, the efficiency of pyrite flotation was also activated. The results indicate that after reacting with hydrophobic insoluble remainders on the surface of pyrite, oxalic acid can pro- duce hydrophilic compounds, such as CaC03, Ca（OH）2 and Fe（OH）3. As a consequence, a flesh pyrite layer was exposed and its flotation activated.

Establishment of Shrub-Grass Vegetation on Rocky Slope of Shaohuai Expressway

Shrub-grass vegetation was established on the rocky slope of Longhui-Dongkou Section of Shaohuai Expressway (Shaoyang to Huaihua) by following the below procedures: ① According to regional climatic characteristics, grasses like Cynodon dactylon, Papalum natatum and Sorghum bicolor (L.) Moench can be applied as pioneering species, local shrubs with drought, cold and infertility resistance like Nerium ndicum Mill., Amorpha fruticosa, Pyracantha fortuneana, and Mycoplasma organism as constructive species, local arbors like Robinia pseudoacacia and Albizia kalkora as accompanying species; ② Slope should be treated first before the establishment of shrub-grass vegetation, then anchored, and covered with nets after the mortar solidified and hardened; after the base materials spraying which includes both substrate spraying and surface spraying, the slope should be promptly covered with non-woven fabrics. The results showed that green coverage ratio of shrub-grass vegetation achieved 90% or above, all quality indexes met the expected standards, which implied that the establishment of shrub-grass vegetation is a rapid and effective way for the vegetation restoration of rocky slopes along expressways, and worth of being promoted in similar climatic zones.

Natural Conditions of Humanity Appearance and Development in Kazakh Steppe

The first humans （hominids） appeared at about the same geological time in three independent areas： in East Africa, southern Indochina and in the Kazakh steppe. People inhabiting all continents and countries around the world descended from hominids that emerged in these three foci then resided elsewhere. The number of people emerged 2-3 million years ago now about 7.0 billion people. They inhabit the planet and the master space. Kazakh steppe, located in the middle of the Eurasian continent, has always had a positive impact on neighboring countries. According to historical geological data obtained in the south near the ridge Karatau, the first people emerged on the territory of Kazakhstan were found about 2 million years ago. Such a conclusion was made on the basis of residual cultural pebble tools of hominids, founded by scientists. As a result of geological survey work carried out in the 1960＇s there were found some primitive people, starting with the era of＂Arystandy culture＂ and including the Late Paleolithic era in the area of ridges Big and Small Karatau. There had been found the fossil remains of large mammals hunted by hominids around the sites of ancient people. Thanks for these residues the corresponding time of residence of primitive people can be judged from the animal world of the Kazakh steppe.