老姜可以治牙痛吗

我们秀月家园北区是一个美丽的小区：春天,桃花开放,虽说不是特别的香,但粉粉的花骨朵实在令人喜爱;秋天,桂花散发出一阵阵花香,甜甜的,花上好像洒了蜜;冬天,梅毫不逊色,刚步入小区,腊梅香就会扑面而来。可是夏天却没有花香,不是因为没有花,而是因为它们都不开了。成片的栀子树,光长叶不打苞。     

苏云金芽孢杆菌四个亚种对温度和pH值的耐受性

以4个亚种的苏云金杆菌为材料,测定其对温度及pH值的耐受性.试验结果表明,经70℃水浴10min处理后,存活率为95%-100%,80℃水浴10 min处理后,存活率为45%-70%,90℃水浴10 min后,有27%-40%的存活率.说明这四株苏云金杆菌对高温有较强的耐受力.当将培养基的pH值调至3时,四株菌都无法生长.当培养基的pH值为4时有两菌无法生长,pH值为5时4个亚种都能生长,pH值为8、9时4个亚种都生长旺盛.说明其在酸性环境中生长性能较差,在弱酸性和微碱性环境中生长较好.     

Simulation and experimental study on hydraulic driving fan cooling system for construction machinery working on plateau

Overheating of the engine, the transmission and the hydraulic device is a problem when the construction machinery works on plateau. To solve this problem, we proposed an electro-controlled hydraulic driving fan cooling system （ECHDFCS）. The system was applied to a 50-wheel loader. We carried out the coolant temperature simulation using fluid modeling software FLOWMASTER, followed by laboratory experiments and road tests. The results show that ECHDFCS can adjust the cooling capability of the system automatically based on machine heat dissipation requirements. The coolant temperature is consequently remained within an appropriate range. The simulation results are consistent with the experiment results when the experiment is performed on the plain, but are different from the road tests in some investigated parameters on the plateau.     

Treating dye wastewater by TiO2 coated on coal cinder

We investigated the photocatalytic degradation of dye wastewater by using titanium dioxide （TiO2） coated on a coal cinder. The coal cinder was used as the carrier, with a thin film of TiO2 coated on it by using the sol-gel method. Using the Congo red as the model pollutant for dye wastewater, we studied the decolorization efficiency, and effects of TiO2 film thickness and roasting temperature on the efficiency. We also evaluated the recycling and regeneration of the immobilized TiO2 （TiO2/cinder）. Results show that the decolorization rate of Congo red solution was more than 98% after 2.h treatment when we used TiO2/cinder calcined at 500 ℃ for 2 h and coated four times as the photocatalyst. At the same time, the TiO2/cinder remained high catalytic activity after being reused and regenerated for many times.     

两株乳酸菌的分离鉴定及产酸性能的研究

从泡菜中分离筛选出两株乳酸茵Lactll和Leull,根据形态特征、生理生化特性进行初步鉴定,并选取室温(白天20℃左右,晚上12℃左右),25℃,37℃三种温度对两株乳酸茵进行培养,通过定时测定两株乳酸菌在三种不同温度下的pH值来考察不同乳酸菌的产酸性能.经初步鉴定,两菌株分别为短乳杆菌、乳球菌.对这两菌株产酸性能的测试结果表明.两株乳酸菌在37℃下培养产酸速率快,同一温度下培养,Leull产酸速率大于Lactll.     

微波消解-AAS法测定中草药中的微量元素

采用微波消解-AAS法测定了制作六味地黄丸的六种中草药中的十种微量元素,对微波消解试剂、消解条件及测定时的干扰情况进行了详细研究.以茯苓样品为例,测得回收率分别为:Zn 120.5%,Fe 106.8%.Mn 118.5%,Co 99.9%,Ni 95.5%.Cu 100.4%,Cr 106.1%,Ca101.5%,Mg 90.5%和K 120.0%.样品测定结果的相对标准偏差在0.17%～7.87%之间,测定方法快速、简便,结果准确可靠.     

传感“温控”数据中心

数据中心的服务器都需要工作在一定的温度范围内,如果温度过高,则系统会无法使用,但如果温度过低,又会浪费能源。美国劳伦斯·伯克利国家实验室最近设计了一种新的系统来更有效地控制数据中心的空调系统。     

夏雨·阳光·彩虹

“东边日出西边雨,道是无晴却有晴。”唐代诗人刘禹锡的这句诗形象地道出了夏季降雨的特点。由于地球地面性质差异很大,夏季受热必然不均,接近地面的空气的温度就不一样。温度高的地方,空气上升猛烈,易形成积雨云,从而有降雨的发生。     

铅淬火炉温度智能测控系统的开发

为了实现铅淬火炉温度的精确控制,开发了温度智能测控系统.阐述了系统的硬件设计和软件实现,硬件包括温度传感器调理电路、数据采集电路、温度控制电路、单片机系统和串行通讯电路,软件是利用LabVIEW进行上位机的串行通讯、PID程序和人机界面的设计.最后分析了该温度智能闭环测控系统的动态精度,并给出实验结果进行验证,其控制精度可达到±1℃以内.     

Theoretical and experimental studies of heat transfer with moving phase-change interface in freezing and thawing of porous potting soil

Soil in a cold region is subject to frequent freezing and thawing cycles. Soil frozen for a prolonged period may cause adverse freeze damage to the plants due to cell dehydration or root cell rupture. It is important to understand the detailed heat transfer behaviors of the freezing and thawing processes to prevent freeze damage, and to devise proper mitigation measures for effective pot planting in cold regions. A theoretical model was developed to analyze the transient moving phase-change interface heat transfer in the freezing and thawing of porous potting soil. The theoretical derivation is based on the assumption that the soil freezes completely at a single temperature. Microscopic poromechanic effects on heat transfer behavior were ignored. The spatial domain of the problem was simplified to a 1 D spherical coordinate system with variation in the radial direction. Green＇s function was applied to solve for the time-dependent body temperature. Experiments were conducted for validation of the theoretical model Reasonable agreement between the theoretical predictions and experimental measurements was obtained. The theoretical model developed can be easily used to determine the sensitivity of various parameters in the freezing/thawing processes, e.g., thermal properties of soil, ambient temperature, and planting pot size.