原子吸收法测定氟钛酸钾中钙的含量

本文研究了氟钛酸钾中钙的原子吸收法测定。用硝酸和高氯酸分解试样，在1％的盐酸介质中，用原子吸收分光光度计测定。     

火焰原子吸收光谱法测定粗铅中铁量

介绍了粗铅中铁的火焰原子吸收光谱分析方法，确立了火焰原子吸收分析铁的仪器条件。通过对其共存干扰离子的影响及其准确度和精密度测试，表明在5％的硝酸介质中使用空气-乙炔火焰原子吸收测定，方法准确、快速、结果可靠，测定范围0．05％-2％。     

缝式原子扑集──火焰原子吸收法测定废水中的CuPhZnCd

缝式原子扑集──火焰原子吸收法测定废水中的ＣｕＰｈＺｎＣｄ武振双，席金晶（石家庄钢铁厂安环处）１前言火焰原子吸收分析方法具有方法简单，操作方便，分析速度快，干扰小等优点。目前已广泛用于各个领域，但对那些金属元素含量在Ｐ召几量级的水样测定仍受到限制。为...     

原子吸收分光光度法测定铁矿中铁、氧化锰

将火焰原子吸收分光光度法应用于铁矿的系统分析，成功地测定了全铁和氧化锰。提出了火焰原子吸收分光光度法测定铁矿中全铁和氧化锰的方法。本法简便、快速、准确。     

固定污染源废气颗粒物中铜及其化合物的测定

对固定污染源废气颗粒物运用电感耦合等离子体质谱法、火焰原子吸收法和石墨炉原子吸收法进行总铜分析验证,结果表明运用火焰原子吸收法和石墨炉原子吸收法测定总铜具有可靠的准确度和良好的精密度,具有很高的可行性。     

原子吸收光度法测定铅阳极泥中的银

铅阳极泥中银含量较高，用原子吸收光度法测定银在化学分析刊物上的未见报道。作者在对比操作的基础上提出用原子吸收光度法测定银，溶样方便、操作简单、易于掌握、比容量法更优越，银的最佳测定范围为１－１０％。     

原子吸收原子荧光法测定土壤重金属的研究

在环境监测当中，对土壤重金属的检测是其中很重要的一部分内容，本文对原子吸收原子荧光法对土壤重金属的测定应用进行了研究，目的 ：应用原子吸收原子荧光法对土壤中的重金属进行测定。方法 ：选取对土壤样品进行前处理的方式，在土壤微波消解的条件下对土壤进行消解。对各种标准的试剂浓度进行严格的配置，静置等到定容之后借助原子吸收分光光度计和原子荧光光度计对土壤样品中的重金属进行测定。结果 ：标准溶液中确实含有重金属。结论：原子吸收原子荧光法带有较好的稳定性，能够很好的应用在对土壤的重金属进行测量上。通过对于上述内容的探究，以求为测定土壤重金属提供有价值的参考和依据。     

原子吸收分光光度法测定锌浸出渣中含铅量

原子吸收分光光度法测定锌浸出渣中含铅量。试样以酸分解，在 2.5％盐酸价质中，用 EDTA络合 Pb2＋，在原子吸收分光光度计 283.3nm处直接测定铅，该法适用范围 0～ 40 ug/mL，灵敏度 0.3ug/mL1％吸收，回收率 98％～ 101％，五次测定的标准偏差为 0.06，变异系数 1.2％。     

火焰原子吸收分析中的原子捕集技术

在原子吸收分析中,火焰原子吸收法仍占主导地位。众所周知,常规火焰原子吸收法是采用气动喷雾进行原子化的,该法雾化效率通常为7～12％,再加之大量载气的稀释,到达火焰供原子吸收测定的原子也就相当稀薄了。另一方面,由于火焰燃烧速度很快,原子在火焰中的停留时间很短(10~(-3)秒),因与供测定的时间也就极为有限。如设计出一种原子化装置,它能达到以下几点要求之一,都能提高火焰原子吸收法的灵敏度:(1)能增加吸收光程的长度;(2)能减少载气的稀释;(3)能增加原子在火焰中停留的时间;(4)能使原子在火焰中     

流动注射原子吸收法的测定应用

流动注射分析是近年来发展起来的新的高速分析技术,这一新技术与原子吸收光谱分析相结合,只需增加很少的设备即可显著提高原子吸收分析的速度,而保持原子吸收法原有的精度。中科院林土所把流动注射原子吸收这一技术应用于土壤植物中金属元素的测定。以水为载流,用原子吸收分光光度计的雾化系统作为载流的动力。采用单通道     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.