Studies on the bottles of mineral water and the foreign plastic like substances

The containers of mineral water and the foreign plastic substances which were found in the mineral water were investigated. Most of plastic bottles were made of polyethylene terephthalate (PET) and the caps were made of polypropylene (PP), polyethylene (PE) or aluminum. PE liners were attached to some caps. Most of the foreign plastic substances were PET while others were PE, PP, Teflon and rubber. Some bottles had a scratch on the top inside. The origin of most PET fragments was presumed to be scraped off the bottles by the lowering of the injection nozzle during the water filling process. The sources of the other substances were also determined.     

Use of disalicylaldehydoethylenediamine in the determination of iron in mineral waters

In experiments carried out in mice, it was shown that amantadine (adamantine) (50, 75, 100 and 200 mg/kg i.p.) reduced the exploratory activity. This phenomenon was due not to reduction of the locomotion and of the muscular force. Amantadine in large doses had a slight convulsant action; at the same dose (100 mg/kg i.p.) it greatly potentiated the convulsant effects of pentetrazol. On Haffner's test amantadine had no analgesic activity.     

低品位复杂红土镍矿微波干燥及矿相分析

研究了在碳化硅辅助吸波作用下,低品位红土镍矿在微波场中的干燥过程.采用热重分析(DTG)、X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)分析考察了添加不同质量分数碳化硅对失重率和产物物相的影响.结果表明:碳化硅与红土矿配比R为2.2:1时,微波干燥处理低镍、铁品位红土矿30min,既可快速脱除矿物绝大部分表面吸附水和部分结晶水;通过控制碳化硅的比例还可以避免过热现象.微波能够改变红土矿的微观结构,促进矿物的分解.进一步的氢还原实验表明,微波干燥有利于红土矿中镍和铁氧化物的还原,其还原率高于常规干燥.     

Use of psychoactive substances in three medical specialties: anaesthesia, medicine and surgery

In order to determine the prevalence of psychoactive substance use in three specialty groupings, 1,624 questionnaires were sent to physicians in medicine, surgery and anaesthesia; all had trained at the same academic institution. A response rate of 57.8% was achieved. Comparison of prevalence of impairment rates showed no differences between Surgery (14.4%), Medicine (19.9%) and Anaesthesia (16.8%). Substance abuse was clearly associated with a family history of abuse; 32.1% of the abusers had a family history of such abuse compared with 11.7% of the non-abusers. Increased stress at various career stages did not appear to increase substance abuse; problem areas during medical life times were similar for each specialty. Substances most frequently used were marijuana (54.7%), amphetamines (32.9%); and benzodiazepines (25.1%). Seventy-three used psychoactive drugs which were non-prescribed. Drug counselling programmes were judged inadequate by most. Use of alcohol and drugs by faculty members was reported by a number of respondents.     

硫化矿生物氧化工艺设计中充气量的计算

分子氧是硫化矿物生物氧化过程中电子转移的最终受体．因此硫化矿物的生物氧化过程必须供氧。依据所处理物料的矿物组成以及设计所采用的氧化率等参数可以计算硫化矿物生物氧化的需氧量，并由此计算充气量。     

采选生产过程的投入产出分析

文中应用投入产出技术，对包括地下采矿主要工艺环节的采选生产过程进行投入产出分析，丰富了投入产出技术的矿山应用内容。     

矿物自动分析系统在攀西某矿区钒钛磁铁矿工艺矿物学上的应用

为得到攀西某钒钛磁铁矿矿石基础的工艺矿物学数据,为以后矿床的开发利用提供包括矿石中矿物组成、含量、元素分布、理论回收率等基础工艺矿物学数据支撑,利用矿物自动分析系统(AMICS)对攀西某钒钛磁铁矿矿石进行研究。从矿区现场取样,在实验室将取回的块状钒钛磁铁矿矿石破碎、磨细、缩分后得粉末样品。为减小粒度差异带来的实验误差,将粉末样品筛分成8个粒级的样品,再制成光片,喷金处理后利用AMICS对分级后的钒钛磁铁矿矿石样品进行研究。查明了矿石的矿物组成及含量、关键元素的赋存状态、矿石矿物的单体解离等工艺矿物学特征。结果表明:攀西某矿区钒钛磁铁矿中矿石矿物主要为钛磁铁矿和钛铁矿,脉石矿物主要为透辉石、角闪石、橄榄石等硅酸盐矿物;矿石中Fe元素主要赋存于钛磁铁矿和钛铁矿中,分布率分别为71.85%和7.80%,另有19.46%的Fe元素分布于硅酸盐矿物中,这部分Fe元素很难回收利用。     

矿物自动分析系统在攀西某矿区钒钛磁铁矿工艺矿物学上的应用

为得到攀西某钒钛磁铁矿矿石基础的工艺矿物学数据,为以后矿床的开发利用提供包括矿石中矿物组成、含量、元素分布、理论回收率等基础工艺矿物学数据支撑,利用矿物自动分析系统(AMICS)对攀西某钒钛磁铁矿矿石进行研究。从矿区现场取样,在实验室将取回的块状钒钛磁铁矿矿石破碎、磨细、缩分后得粉末样品。为减小粒度差异带来的实验误差,将粉末样品筛分成8个粒级的样品,再制成光片,喷金处理后利用AMICS对分级后的钒钛磁铁矿矿石样品进行研究。查明了矿石的矿物组成及含量、关键元素的赋存状态、矿石矿物的单体解离等工艺矿物学特征。结果表明:攀西某矿区钒钛磁铁矿中矿石矿物主要为钛磁铁矿和钛铁矿,脉石矿物主要为透辉石、角闪石、橄榄石等硅酸盐矿物;矿石中Fe元素主要赋存于钛磁铁矿和钛铁矿中,分布率分别为71.85%和7.80%,另有19.46%的Fe元素分布于硅酸盐矿物中,这部分Fe元素很难回收利用。     

The surface-active compounds of a Pseudomonas sp. S-27 culture

Pseudomonas species S-27 was grown on various substrates. It was established that the Pseudomonas species S-27 strain can produce biosurfactants of ramnolipid nature decreasing the surface and interfacial tension to 29.2 and 0.05 mN/m. respectively, as well as a biopolymer stabilizing the emulsions with hydrocarbons and oils. The biosurfactant and bioemulsifier synthesis is shown to depend of the substrate nature.     

配煤对煤灰熔融过程的矿物演变的影响

对高钙烟煤和低钙无烟煤以及这两种煤组成的混合煤进行灰熔融特性研究。利用灰熔点测试仪测定煤灰的灰熔融特征温度,通过FactSage热力学软件的Equilib模块和Phase Diagram模块计算煤灰熔化过程的物相变化。结果表明,煤的灰熔点与煤灰的成分密切相关,酸性物质能使混煤灰的熔融特性温度升高,碱性物质使混煤灰的熔融特性温度降低;通过FactSage的Equilib模块得到的熔化过程可以看出,烟煤和无烟煤煤灰的熔融特性差异是温度高于1 000 ℃时莫来石和钙铝黄长石的含量变化导致的。对于混煤灰,随着低钙无烟煤比例的增加,在1 000 ℃的矿相成分中莫来石含量增加,钙铝黄长石含量减少,导致混煤灰熔点提高。     

Demonstration of efficient trichloroethylene biodegradation in a hollow-fiber membrane bioreactor

Rapid cometabolism of trichloroethylene (TCE) by pure cultures of Methylosinus trichosporium OB3b PP358 was demonstrated in a two-stage hollow-fiber membrane bioreactor over the course of 3 weeks. PP358 was grown in a continuous-flow chemostat and circulated through the shell of a hollow-fiber membrane module (HFMM), while TCE contaminated water (160 to 1450 micrograms/L) was pumped through the fiber lumen (fiber interior). In parallel-flow HFMM biological experiments, 82% to 89% of the influent TCE was removed from the lumen (5.1-min residence time) with 99% of the transferred TCE undergoing biodegradation. Biological experiments in a larger capacity baffled radial-flow HFMM resulted in 66% to 99% TCE transferred and 93% to 96% TCE biodegradation at lumen residence times of between 1.5 and 3.7 min. Biodegradation was maintained throughout the experiments at pseudo-first-order biodegradation rate constants of 0.41 to 2.8 L/mg TSS/day. Best-fit computer modeling of the baffled radial-flow biological process estimated mass transfer coefficients as large as 2.7 x 10(-2) cm/min. The computer model was also shown to simulate the experimental results quite well.     

尾矿压滤干堆在凤城地区黄金生产中的应用

从尾矿库坝体安全、环境保护、节能减排、经济效益角度,分析了尾矿湿式堆存方式存在的问题,论述了尾矿压滤干堆技术在凤城地区黄金生产中的应用及其效果,为黄金生产企业尾矿处置及尾矿库改造提供借鉴依据。     

开展工艺矿物学考查指导选矿生产综合回收

某铜硫矿系中低温热液型矿床,矿体各中段铜次生富集不均匀,多次选矿小型实验结果在生产中很难实现,是困扰选矿技术人的技术性难题。因此,本文对工艺矿物学考查指导选矿生产综合回收进行分析,希望为今后选矿回收提供参考。     

Use of transverse microradiography to quantify mineral loss by erosion in bovine enamel

BACKGROUND: A double blind, placebo controlled study was undertaken to determine the effects of 104 weeks of intermittent cyclical etidronate therapy on bone mineral density (BMD) in patients undergoing long-term oral corticosteroid therapy. METHODS: Forty nine patients of mean age 59 years on long-term (> 6 months) corticosteroid treatment were randomised to receive either 400 mg/day etidronate or placebo for 14 days followed in both groups by calcium (equivalent to 97 mg elemental Ca/day) with vitamin D (400 IU) for 76 days. The cycle was repeated a total of eight times over a period of two years. Dual energy x ray absorptiometry (DEXA) measurements of the lumbar spine and hip BMD and biochemical bone marker analyses were performed at baseline and every six months. RESULTS: Twenty six patients (10 men) received cyclical etidronate and 23 (nine men) received placebo. The mean (SD) dose of corticosteroid (prednisone or equivalent) at baseline in the etidronate group was 8 (4) mg/day and in the placebo group was 7 (4) mg/day. Most of the patients (43%) suffered from asthma. Forty one patients completed the study (22 in the etidronate group and 19 in the placebo group). All had a low BMD at entry and with treatment a significant difference was observed between groups in the mean (SE) percentage change from baseline in lumbar spine BMD at week 104 of 4.5 (1.65)% (p = 0.007) with a 95% confidence interval (CI) of 1.12 to 7.87%. No clinically or statistically significant treatment differences were observed at the hip or with bone markers. The incidence of adverse events was similar in the two groups. CONCLUSIONS: The results show that intermittent cyclical etidronate therapy with calcium and vitamin D supplementation significantly increases lumbar spine BMD in patients with osteoporosis resulting from long-term treatment with corticosteroids.