矿用新产品简介

寿命可达10万小时的指示灯灯泡英国柴普格龙有限公司(ZepGlow Ltd.)最近制成一种防爆防水防冲击的指示灯灯泡,其设计连续使用寿命可达10万小时(合11年多)。反复开关使用时寿命可延至20万小时。这种灯泡由一个三联发光二极管束和1个放大滤光器构成,在开关状态之间有很高的对比度。灯光颜色有红、绿和琥珀色之分,其脉动光和非脉动光适于用12～240伏交流50赫芝和12～48伏交直流电源。用整体固态部件可不必使用外部变     

国外新产品简介

电子计算机绘图技术美国膝泰姆(Tentime)计算机绘图和图表服务中心研究成一种先进的绘图技术,供矿物勘探和生产、露天矿设计和计划以及体积计算应用。为适应矿业的需要,该公司采用了六段法。数据输入段:在此段中,用户提供的与工程有关的全部钻孔信息连同各种数据均输入Tentime计算机系统。也可将原有工作图或其它比例图的有关资料数字化。三维模拟段:有此段中,计算一整套平面方向的和各向同性的可变克数。利用这     

国外专利简介

充填混合物组分含有钾碱矿尾矿的充填混合物,其特点是为了提高充填体的强度、充填采空区的完全程度和降低充填成本,在充填混合物中添加石灰质粘土和混凝土块,其组成的重量配比(％)如下:钾碱尾矿70—92.5,石灰质粘土2.5—10,混凝土块5—10。     

对二甲苯低温氧化反应液中二价及三价钴的测定

本文提出对二甲苯低温氧化反应液(冰醋酸介质)中二价和三价钴测定方法。以 EDTA 络合滴定测定总钴量。采用硫酸高铈溶液为滴定剂,邻菲罗啉溶液为络合剂,铂、甘汞电极对电位滴定测定二价钴。由总钴与二份钴的差值,计算出三价钴的含量。     

再论高校体育教学的改革

本文论述了体育作为人类所特有的一种社会文化现象,系由三个层面组成,即外层的器物层,中层的制度层,内层则为观念层。为深化我国高校体育教学的改革工作,本文针对不同的文化结构层面试予理性探索,进而建立体育教学系统的圭臬框架。     

Molecular inflammation hypothesis of aging based on the anti-aging mechanism of calorie restriction

Accumulating evidence strongly suggests that oxidative stress underlies aging processes. Research provides consistent evidence that calorie restriction (CR) reduces age-related oxidative stress and has anti-inflammatory properties. However, information is lacking on the molecular mechanism that would better define the interrelation of reactive oxygen species and nitrogen species and the pro-inflammatory states of the aging process. In this review, the biochemical and molecular bases of the inflammatory process in the aging process are analyzed to delineate the molecular inflammation hypothesis of aging. The key players involved in the proposed hypothesis are the age-related upregulation of NF-kappa B, IL-1 beta, IL-6, TNFalpha, cyclooxygenase-2, and inducible NO synthase, all of which are attenuated by CR. Furthermore, age-related NF kappa B activation is associated with phosphorylation by I kappa B kinase/NIK and MAPKs, while CR blocked these activation processes. The modulation of these factors provides molecular insights of the anti-inflammatory action of CR in relation to the aging process. Based on available finding and our recent supporting evidence, we prefer to use "molecular inflammation" to emphasize the importance of the molecular reaction mechanisms and their aberrance, predisposing to fully expressed chronic inflammatory phenomena. It was further proposed that CR's major force of the regulation of redox-sensitive inflammation may well be its life-prolonging action.     

The effect of microgravity and space flight on the chemical senses

ABSTRACT: The effect of space flight and microgravity on the chemical senses is reviewed. Skylab-4 and Soyuz 30–31 studies revealed changes in taste thresholds while no effect was found in a Canadian investigation (41-G) and conflicting results were obtained on another Soyuz mission. Two simulated microgravity studies found no effect on taste or smell sensitivity; while 5 other studies found an effect. Microgravity induces physiological changes including an upward shift of body fluids toward the head, which may lead to an attenuation of the olfactory component in the flavor of foods. Chemosensory changes may also relate to space sickness, Shuttle atmosphere, stress, radiation, and psychological factors.     

Feeding linseed to increase the n-3 PUFA of pork: fatty acid composition of muscle, adipose tissue, liver and sausages

Eighty pigs, male and female littermate pairs, were fed a control or a test diet from 25 to 95 kg live weight. The diets, as fed, contained 15.5 g/kg linoleic acid (18:2) and 1.9 g/kg α-linolenic acid (18:3) (control) or 10 g/kg linoleic acid and 4 g/kg α-linolenic acid (test). The test diet, with added linseed, was, therefore, high in the main n-3 polyunsaturated fatty acid (PUFA) 18:3 and low in the main n-6 PUFA 18:2. Making this relatively small change led to a 56% increase in the content of 18:3 in muscle and major increases in the contents of the beneficial longer chain PUFAs EPA (20:5n-3) (100% increase) and DHA (22:6n-3) (35% increase) which are synthesised from 18:3n-3. Levels of EPA and DHA in pigmeat adipose tissue were also increased by the test diet. In liver, the test diet resulted in an 18:3 level 4× higher than in muscle, with 10× more EPA and 20× more DHA. Sausages, analysed after 6 months frozen storage also had high n-3 PUFA levels, due to the contribution of these fatty acids from both muscle and adipose tissue. From a health perspective these results confirm the potential of pigmeat to supply valuable n-3 PUFA to the human diet. The test diet produced a PUFA:saturated FA ratio in muscle of 0.4, close to the minimum recommended value for the diet as a whole and an n-6:n-3 ratio of 5, a significant improvement on the current average for pigmeat (7). It is estimated that the test diet would provide 12 g of long chain n-3 PUFA to the human diet per annum at current pigmeat consumption levels in the UK, about a third of that from oily fish.