某发动机用Cu-Ni-Si生产工艺的确定

利用公司化学成分合格的材料, 对所需要的大电流连接器用Cu-Ni-Si合金进行工艺研发, 通过查阅文献和现有工艺结合的方式, 初步选择50%和65%两个不同的冷轧加工率、时效工艺选择460、480、500 ℃三个温度。通过正交实验, 对得出的所有结果进行汇总, 对材料显微组织、力学性能及电性能的变化规律进行分析, 结合不同加工工艺下的力学性能和电性能的检测结果, 同时考虑公司设备能力、生产效率等各种因素, 最终确定了某发动机大电流连接器用Cu-Ni-Si合金较优工艺为:冷加工率为50%、时效工艺为500 ℃×3 h, 综合性能达到HV_{(0.3 kg)}为195~521、抗拉强度:630~710 MPa、屈服强度在470~600 MPa、延伸率大于13.5%、导电率大于45%IACS, 完全满足某发动机大电流连接器用Cu-Ni-Si合金带材的使用要求。      

难浸金矿预处理技术及其研究进展

随着易浸金矿的不断减少,难浸金矿应用比重越来越大,总结难浸金矿的预处理技术及其研究进展有重要意义。简要分析了难处理金矿难浸的原因,指出难浸金矿在浸出前进行预处理的必要性,对加压氧化法、焙烧法、生物预氧化法和超细磨法等难浸金矿的预处理方法以及新的预处理技术进展进行了总结,评述了各预处理方法的优缺点,在此基础上,对难处理金矿的预处理技术研究前景进行了展望。     

Hereditary occurrence of the mesotelesystolic click syndrome: a study of 9 families (author's transl)

Nine families affected by the mid-systolic click syndrome were studied. Of the one hundred and forty-four first-degree relatives, 117 of whom were living, eighty-four were examined. Thirty-five were found to be affected by the syndrome. Twenty-six were females and nine were males. Auscultatory and phonocardiographic findings consisted either of isolated mis-systolic clicks or systolic murmurs or a combination of the two. Electrocardiograms revealed changes of various types, most commonly of the ST-T segment. About seventy per cent of the patients were symptomatic. Nine members, not examined by the authors, had died suddenly; all had a previous history of "cardiopathy". Progressivity of mitral valve disease with age is not confirmed by the present study. It is suggested that the mode of inheritance of the defect might be that of an autosomal dominant form of Mendelian type with delayed expression of the defect. An alternatove hypothesis of a multifactorial inheritance mechanism, which is more stimulating for future studies on the cause of the syndrome, is also taken into consideration.     

A recombinant adenovirus that directs secretion of biologically active kappa-bungarotoxin from mammalian cells

The purpose of this investigation was to develop a method that could be used to estimate how damaging sodium ethoxide is to different antigens with respect to immunolabeling when epoxy sections are deplasticized. If we obtain weak labeling for an antigen on deplasticized epoxy sections, this might be caused by the damaging effect of the ethoxide solution. It is therefore interesting to develop a method to check if this really is the reason. Fibrin clots and tissues of human kidney and thyroid were embedded in LR White resin. Some thin sections from these specimen blocks were exposed to sodium ethoxide in the same way as epoxy sections are when being deplasticized. Other sections from the same blocks were not exposed to sodium ethoxide. Both categories of sections were immunogold-labeled with anti-fibrinogen, anti-thyroglobulin, anti-IgA, anti-IgG, or anti-IgM. The intensity of immunolabeling of sections treated with ethoxide was compared with the immunolabeling of corresponding sections that were not treated with ethoxide. No significant differences were found in immunolabeling for fibrinogen, IgA, IgG, and IgM. For thyroglobulin, the intensity was approximately 30% less in tissues that were exposed to sodium ethoxide. The practical significance of this method is that we easily can examine the degree to which a given antigen is affected by sodium ethoxide, which is the agent used for deplasticizing epoxy sections.     

炼钢氧枪系统的改造及应用

炼钢厂转炉扩容后对氧枪系统进行了改造,重新设计了氧枪尺寸及喷头,改造了氧枪输送管路与控制系统,优化了各项工艺参数。氧枪改造后,提高了供氧强度,缩短了冶炼周期,溅渣效果良好,增加了经济效益。     

ICP-AES法测定矿石中砷的测量不确定度的评定

对ICP-AES法测定矿石中砷的整个实验过程进行了分析,对其不确定度进行了研究。阐述了测定过程中各不确定度的主要来源,并对各不确定分量进行了评定和合成,得出了合成标准不确定度、扩展不确定度及样品的置信区间。     

Ni-TiN超细粉的制备与特性

在H₂-N₂-Ar混合气氛下,用直流电孤等离子体熔化Ni-Ti合金,制备了Ni-TiN超细粉,采用XRD,TEM,DTA-TGA等多种测试手段研究了粉体的相组成、形貌、粒度分布和氧化特性。结果表明,粉体由Ni、TiN和微量Ni₃Ti组成,复合粒子的形态主要有亚铃形、椭球形、骰子形。在空气中,粉体在300℃左右开始明显氧化,TiN粒子在480℃左右氧化分解。     

Primary targets of fluoroquinolones in Streptococcus pneumoniae

Mutants of wild-type Streptococcus pneumoniae IID553 with mutations in parC were obtained by selection with trovafloxacin, levofloxacin, norfloxacin, and ciprofloxacin. All of the parC mutants were cross-resistant to the selecting agents but were not resistant to gatifloxacin and sparfloxacin. On the other hand, gyrA mutants were isolated by selection with gatifloxacin and sparfloxacin. The gyrA mutants were cross-resistant to gatifloxacin and sparfloxacin but were not resistant to the other fluoroquinolones tested. These results suggest that in wild-type S. pneumoniae the primary target of trovafloxacin, levofloxacin, norfloxacin, and ciprofloxacin is topoisomerase IV, whereas the primary target of gatifloxacin and sparfloxacin is DNA gyrase.     

Personal projects, happiness, and meaning: On doing well and being yourself.

Personal Projects Analysis (B. R. Little, 1983) was adapted to examine relations between participants' appraisals of their goal characteristics and orthogonal happiness and meaning factors that emerged from factor analyses of diverse well-being measures. In two studies with 146 and 179 university students, goal efficacy was associated with happiness and goal integrity was associated with meaning. A new technique for classifying participants according to emergent identity themes is introduced. In both studies, identity- compensatory predictors of happiness were apparent. Agentic participants were happiest if their goals were supported by others, communal participants were happiest if their goals were fun, and hedonistic participants were happiest if their goals were being accomplished. The distinction between happiness and meaning is emphasized, and the tension between efficacy and integrity is discussed. Developmental implications are discussed with reference to results from archival data from a sample of senior managers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Understanding extraverts' enjoyment of social situations: The importance of pleasantness.

Extraversion is a broad, multifaceted trait, yet researchers are still unsure of its defining characteristics. One possibility is that the essential feature of extraversion is the tendency to enjoy social situations. An alternative possibility is that extraversion represents sensitivity to rewards and the tendency to experience pleasant affect. In three studies, participants rated situations that varied on two dimensions: (a) whether they were social or nonsocial and (b) whether they were very pleasant, moderately pleasant, moderately unpleasant, or very unpleasant. Extraverts only rated social situations more positively than introverts did when the situations were pleasant, and extraverts also rated nonsocial situations more positively than introverts did if the situations were pleasant. Thus, the pleasantness of situations was more important than whether they were social or nonsocial in determining extraverts' and introverts' enjoyment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

ICP-AES法测定矿石中金的测量不确定度的评定

文章通过对ICP-AES法测定矿石中金的整个实验过程进行分析,对其测量不确定度进行了研究.阐述了测定过程中各不确定度的主要来源,并对各不确定度分量进行了评定与合成,得出了合成标准不确定度、扩展不确定度及一个样品的置信区间.     

Distortions and tensile properties of 15-5PH steel cylinders with EBW and heat treatment

15-5PH steel is one of the martensitic precipitation-hardened stainless steels, which is extensively applied in the aero shafts, and electron beam welding is a significant procedure to manufacture the parts. To verify the dimension accuracies and properties, EBW with oscillation was employed on the cylinders of 15-5PH steel. The welding distortions were measured, and the microstructures and tensile properties of the joints were investigated. The weld appearances of the cylinders were smooth, and the morphology was parallel. After EBW, the shrinkages of the cylinders were above ?0.22?mm, and the welding distortions were ?0.66 to ?1.1‰, and the straightnesses were less than 1‰ due to the distortions. The martensites and a few austenites were in the welds of the cylinders after heat treatment, and the microhardnesses in the welds were 445 HV0.2, which were bigger and more homogeneous than those of the as-welded. The tensile strength and yield strength of the joints were respectively 1300 and 1150?MPa, which were higher than those of the as-welded joints, and the elongation rate of the joints was 10%. The microstructures and properties of the cylinders conformed to the aero shafts, which was attributed to the microstructure transformation with oscillation EBW and heat treatment.     

The prevalence of Trichinella spiralis in foxes (Vulpes vulpes) and other game species in Denmark

A survey of the rate of infection with Trichinella spiralis among game animals in Denmark is given with special regard to foxes. A total of 5084 foxes and 293 mustelidae were examined, most of them by a combined digestion and Baermann technique. Deep-frozen samples were examined by a method including digestion, filtration, and sedimentation. Four foxes were found infected (cf. Fig. 1). Three of them were shot inside or just outside a fenced area within which wild boars had previously been found infected. It is concluded that Trichinella infection in Danish free-living carnivores is very rare and that the prevalence in foxes is low compared to most European countries.     

FeCuNbSiB粘结磁体的制备及磁性能研究

通过2种途径将熔体快淬法制得的FeCuNbSiB非晶薄带制成环状粘结磁体。一是将非晶薄带进行晶化处理,再将晶化后的薄带粉碎成不同粒度的粉末,然后与粘结剂相混合制成粘结磁体。二是将非晶薄带直接粉碎成不同粒度的粉末,再将此粉末进行晶化处理,将晶化后的磁粉与粘结剂相混合制成粘结磁体。分析了磁粉粒度和模压压力对粘结磁体性能的影响。并对两种粘结磁体的性能进行比较。结果表明,第一种方法制备的粘结磁体的性能优于第二种。     

Comparative study of artists and nonartists on the maitland graves design judgment test.

Administered the maitland graves design judgment test to 229 male and 236 female nonart students and 519 male and 478 female art students. Only very slight differences were observed between groups. Following the lines of a previous factor analysis of the test, scores were derived for 3 subsets of designs (symmetrical, 3-dimensional, complex). These scores were negligible correlated with each other. Conspicuous differences between artists and controls were only found for the symmetrical set, and scores on this set were more homogeneous for artists than for controls. The use of overall scores on a heterogeneous test is criticized, and the development of a more homogeneous test based on symmetrical designs only is suggested. An explanation is suggested for the differences in results reported by graves and the present study. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

安钢2000级高炉喷煤系统改造与生产实践

针对安钢2 200 m3高炉喷煤系统投产后,喷煤系统喷吹能力不足、瞬时喷吹量波动较大等的问题进行了系统分析与设备改造,取得较显著的成效。喷吹能力由原来的20 t/h提高到45 t/h以上,瞬时煤量波动由原来的1 t/h稳定在300 kg/h以下,并依此指导了后期投产的2 800 m3高炉喷煤系统的设计,使得2800m3高炉的喷煤按计划顺利投产并达到设计指标。     

Permanent paraplegia following epidural and general anesthesia: two case reports

Two strains of rats, Sprague-Dawley and Wistar, were assayed in order to determine which strain is the more suitable experimental model for the study of pharmacokinetic alterations induced by spinal cord injury. Animals were submitted to spinal cord contusion at the T8-T9 level by the weight drop method. A single acetaminophen oral dose (100 mg/ kg) was administered 24 h after injury and blood samples were drawn for a period of 4 h. Acetaminophen concentration in whole blood was determined by high performance liquid chromatography and pharmacokinetic parameters were estimated. For both strains, Cmax and AUC were significantly lower, whereas tmax remained unchanged, in injured animals compared to sham-injured controls. Circulating acetaminophen concentrations were higher; therefore, pharmacokinetic alterations were more easily discerned, in Sprague-Dawley than in Wistar rats. It is concluded that the Sprague-Dawley strain is a more suitable model for the study of pharmacokinetic alterations induced by spinal cord injury.     

La-Ce-Cu复合金属氧化物的结构表征及催化性能

本文用ＮＨ４ＮＯ３共熔法合成Ｌａ－Ｃｅ－Ｃｕ系列样品。用ＸＲＤ分析了ＣｅＯ２在铜酸镧盐中的溶解度,发现大量ＣｅＯ２存在时,Ｌａ２Ｏ３、ＣｕＯ的加入导致原晶体结构发生变形,生成少量铜酸镧盐。ＸＲＦ分析了系列样品组成均为氧缺陷型化合物。ＸＰＳ研究发现,含大量ＣｅＯ２的样品高温焙烧后在ＣｅＯ２表面生成复合金属氧化物Ｌａ２ＣｕＯ４,最表面一层为少量Ｌａ２Ｏ３,并确定了其中Ｏ的属性。利用ＴＥＭ研究了部分样品的表面结构,同时研究了其ＣＯ催化氧化活性。     

Urinary bacteria in elderly patients with urinary incontinence and low levels of daily activity

The results of bacteria isolated from the urine of inactive elderly patients with urinary incontinence in 1982, 87, 93 and 95 were compared and the chronological changes of urinary bacteria were analyzed. The following results were obtained: (1) The most common bacteria isolated from the patients in 1995 were D-group Enterococcus, followed by Providencia rettgeri, E. coli, Pseudomonas aeruginosa and Proteus mirabilis. It is thought that the main cause of the more frequent isolation of Enterococcus is an abuse of cephems and fecal contamination. (2) The most common bacteriaisolated from the patients who were managed with an indwelling urethral catheter were Proteus and Providencia species, and their incidence tended to decrease from 1982 to 1995. (3) Infection with Pseudomonas species tended to increase, as did that Staphylococcus species, especially Methicillin-resistant Staphylococcus aureus and then decreased. Based on these findings, it is important to assess and treat dysuria before inserting an indwelling urethral catheter, and to select an antibacterial agent that is effective in elderly patients with urinary incontinence and limited activity.     

Atrial receptors in the cat

Action potentials were recorded from slips of the cervical vagi in anaesthetized cats. Single functional units with atrial patterns of discharge (type A, B and Intermediate) were first obtained and then attempts were made to alter (i.e. convert) their patterns of discharge. Finally the points of origin of their action potentials were located. The investigations were done in five stages. 2. In the first series, thirty unselected units were investigated in thirty cats. Twenty-five of these were located in the endocardium of vein-atrial system and consisted of two type A, fifteen type B and eight Intermediate type units. The remaining five units were located elsewhere in the chest Conversion of the pattern of discharge was achieved in sixteen of the twenty-five atrial units. Both atrial type A units were converted. 3. In the second series, eight type A units were selectively studied in twelve cats. Five were located in the atrial endocardium and all were converted. Of the other three units which were located at other sites in the chest, one could not be converted. 4. In the third series, four type A units which could not be converted were selectively studied in twenty cats. All were located outside the atria. 5. In the fourth series, three type B units which could not be converted were selectively studied in six cats. These units were located in the pulmonary veins and in the lateral walls of the atria. 6. In the fifth series, fifty-five units were investigated in three anaesthetized spontaneously breathing cats. The proportion of the types of units were similar to that obtained in the artificially respired cats (first series). 7. The present study has shown that atrial receptors with a type A pattern of discharge are relatively rare in the cat and that conversion of the patterns of discharge is a common phenomenon. Evidence is presented which suggests that there is one basic type of atrial receptor whose pattern of discharge is determined by their precise location in the vein-atrial system.