烧结杯试验监控系统的设计

介绍了烧结杯试验监控系统的硬件配置和软件组成,重点讨论了基于S7-300系列PLC及WinCC软件开发的烧结杯试验监控系统.实践表明,系统稳定可靠,改善了烧结杯试验系统的操作和控制,提高了试验效率及试验数据的准确性.     

金厂峪金矿充填尾砂基本性能试验研究

充填尾砂基本性能试验是充填技术应用的基础性工作。通过对金厂峪金矿充填尾砂进行物化性质测定及尾砂沉降试验、饱和度试验和泌水试验,全面掌握了充填尾砂基本特性;根据试验结果并结合强度试验及料浆扩散度试验确定了料浆输送浓度为70%~72%,充填灰砂比(1∶4)~(1∶8),为金厂峪金矿充填工艺及充填系统设计提供了基础数据。     

40CrMnSiMoV弹簧钢热处理工艺与力学性能研究

通过端淬试验及经各种工艺热处理试验,对弹簧钢40CrMnSiMoV的淬透性及热处理工艺与力学性能进行了试验研究.试验结果表明:此钢种不仅淬透性良好,而且力学性能强、韧性水平高.     

复杂铜精矿沸腾焙烧扩大试验研究

本文对含Zn、Pb、Sb的复杂铜精矿沸腾焙烧扩大试验进行总结,确定了试验方法,进行了烟气量及烟气浓度的计算,并且确定了沸腾焙烧扩大试验的试验参数。     

检测过程对40MnBH钢末端淬透性的影响与控制

介绍了末端淬透性的试验原理,通过一系列相关因素的试验及分析,提出控制淬透性试验准确性的重要环节。     

ICP-AES法测定铝及铝合金中24种元素

本文研究了利用IRIS型电感耦合等离子体光谱分析仪分析铝及铝合金中24种元素的方法，阐述了样品及试剂的制备方法以及分析线的选择，对干扰试验、检出限试验、回收率试验及精密度试验结果进行了分析讨论。大量试验结果表明，本方法快捷、简便、准确度高，可以在铝加工行业推广应用。     

铁矿石国家标准样品的研制

介绍了铁矿石国家标准样品的整个研制过程.对研制中的一些技术问题进行了讨论.确定最终要定值的元素,选择合适的矿源加工成待定值的标准样品粉末,介绍了均匀性试验,吸湿干燥试验,粒度分布试验,金属铁试验的整个试验过程及试验结果,并按数理统计方法确定各种成分的标准值和定值精度,进行了稳定性试验.     

球团矿一级标准物质的研制及问题讨论

详细介绍了球团矿一级标准物质的研制过程,包括样品加工、均匀性检验、吸收干燥试验、粒度分布试验、稳定性试验、比对试验及定值等。对研制过程中影响标准样品质量的问题进行了阐述。本标准物质的研制成功创造了可观的经济效应,并为选矿及球团矿的进出口贸易提供了更高水平的化学分析检验依据。     

汽车悬架弹簧用钢的弹性衰减抗力

叙述了弹簧的弹性减退机理及化学成分、热处理、气体夹杂对弹簧钢抗弹减性的影响、介绍了弹簧及弹簧钢抗弹减性能的静动态松驰试验,螺旋弹簧残余剪应变和拉伸松驰试验,鲍辛格扭转试验等评价方法。     

等离子体发射光谱法联合测定除尘灰中氧化物

建立了等离子体发射光谱法联合测定除尘灰中SiO_2、CaO、MgO、Al_2O_3的方法,优化选择仪器主要工作参数,进行了样品分解方法试验、酸度试验、基体干扰及消除试验、准确度试验、回收率及精密度试验,最终确定了ICP-AES法联合测定除尘灰中SiO_2、CaO、MgO、Al_2O_3的方法。该方法快速,准确,简便,测定范围宽。将本法测定结果与化学分析值比较,结果满意。     

镍基合金控样均匀性初检探讨

采用火花放电原子发射光谱法检测成分时,往往需要自制与被测样含量一致、成分均匀的试块作为控样建立测试程序,因此需要对拟选定的控样试块进行均匀化检验。依据YB/T 4143—2019采用方差分析法检验镍基高温合金控样试块均匀性,需要进一步分析检验方法的精密度,只有控样检验所用方法与日常所用方法具有相同的重复性,判定结果才可靠。以INCONEL 718为研究对象进行均匀性检验的分析结果发现,检验过程中所用检验方法重复性方差较大,存在不均匀样品判为均匀的误判可能。采用内插法对测试系统的漂移进行了校正,并重新计算了均匀性检验参数。结果表明,该试块漂移校正前Fe元素检验结果是均匀的,漂移校正后检验结果为不均匀。除Fe元素外,其他元素均匀性检验结果均为均匀。讨论了Fe元素作为Balance元素存在不均匀性分布存在的根本原因,并采用该试块作为控样检测了GH4169标准物质的化学成分,检测结果的正确度符合GB/T 38939—2020及文献要求。实验方法适用于工矿企业自制火花放电原子发射光谱控样的均匀性检验。     

废胶粉改性沥青微表处性能试验研究

分析了影响废胶粉改性沥青性能主要因素包括混合温度、混合时间、胶粉加入量及SBS添加剂,通过试验确定最佳油石比并进行废胶粉改性沥青混合料车辙试验、劈裂试验、浸水马歇尔试验。试验数据表明在各影响因素的最佳条件下进行废胶粉改性沥青性能试验,确定最佳油石比为4.73时废胶粉改性沥青混合料的车辙试验、劈裂试验、浸水马歇尔试验满足规范要求且优于基质沥青混合料路用性能。     

Z向钢板超声波探伤不合格的原因分析

针对Z向钢板探伤不合格的现象,通过低倍、金相、Z向拉伸试验等检验,探讨了缺陷产生的原因。结果表明,钢中氢含量高是导致探伤不合格的主要原因。通过采取措施,提高了探伤合格率。     

全自动炼钢化验技术应用现状及发展趋势

介绍了传统炼钢化验技术、全自动炼钢化验技术以及其他炉前快速分析技术,阐述了全自动炼钢化验的技术优势、关键技术点和不足之处,总结了国内外全自动炼钢化验室应用现状,对全自动炼钢化验技术的发展趋势进行了展望。     

双膜法用于钢铁厂综合性工业废水的中试研究

介绍了鞍钢尝试用双膜法处理钢铁企业综合性污水的试验目的、过程及结论,验证了实验工艺的可行性,初步确定了用于今后工程建设的主要工艺流程,并以此为依据,调整相关技术参数,为下一步开展工程设计提供参考和借鉴。     

Development of new methods for determining the formability and flow stress of materials based on intermetallic compounds

The following test methods were developed: the small-cup tension test, the mantle compression test, and the ball compression test. They are applicable up to very high temperatures. The experiments with model materials and NiAl- and TiAl-compounds were combined with plastomechanical calculations by the method of upper bound of deformation power and by the method of finite elements.     

Tissue concentrations and pharmacokinetics of florfenicol in broiler chickens

OBJECTIVE: To compare the Bard BTA (bladder tumour antigen) test with voided urine cytology (VUC) in the diagnosis of recurrent bladder cancer (BC). METHODS: Urine specimens for the BTA test and VUC were collected on the same day as before cystoscopy from patients undergoing routine surveillance cystoscopy for recurrent BC. The pathologists performing VUC were blinded to the results of the BTA test. RESULTS: BC was identified by cystoscopy and biopsy in 39 of 164 study participants. The overall sensitivities of the BTA test and VUC were 54 and 28%, respectively (p < 0.05). The BTA test was more sensitive than VUC for all tumour stages and grades. For > or = T2 tumours and grade 3 tumours, respectively, the difference was statistically significant (p < 0.05). The specificities of the BTA test and VUC were 92 and 97%, respectively. Both a false-positive BTA test and VUC were found to predict recurrence. CONCLUSION: The BTA test is equal or superior to VUC in the detection of BC in patients undergoing routine surveillance for recurrent BC.     

Sense of coherence, coping strategies, and test anxiety as predictors of test performance among college students.

The study tested sense of coherence (SOC; Antonovsky, 1987), coping strategies, and test anxiety as predictors of test performance in 216 1st-year undergraduates. The students attended 3 obligatory courses and completed inventories assessing SOC, coping, and test anxiety during the final session of the 2nd semester; their grades on the final examination were recorded. The results showed SOC to be negatively related to test anxiety, whereas emotion-focused coping and avoidance were positively related to it. Problem-focused coping contributed positively to performance on the test, and avoidance coping adversely affected test grades. The data suggest that test anxiety is minimally associated with performance grades, and the 2 measures are related somewhat differentially to coping strategies and SOC. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Modulation of antennal scanning in the honeybee by sucrose stimuli, serotonin, and octopamine: behavior and electrophysiology

The objective of this publication is to present a new dynamic aerobic biodegradation test method simulating a river. A laboratory cascade test system and standardized batch shake flask tests were used for biodegradation studies with the non-volatile and non-sorbing model compounds 2,4-dinitrophenol, naphthalene-1-sulphonic acid and sulphanilic acid. To be closer to the often very low concentrations of substances in the environment the concentrations of the compounds used were standard test concentrations and lower. 14C labelled compounds were measured at 50 micrograms/l, capillary electrophoresis at 5000 micrograms/l and the removal of dissolved organic carbon at 50000 micrograms/l. The test results obtained confirmed the known ultimate biodegradability of the test compounds and showed that biodegradation degrees, rates and degradation durations depended on the test systems, the concentrations of test compounds and the inocula. The river model is a suitable simulation test for natural dynamic surface waters which can be used to perform biodegradability studies at low test concentrations if adequate analytical tools, preferably radioactive-labelled substances, are available.     

The Bonney test: a reassessment

OBJECTIVE: The purpose of this study was to reassess the effects of the Bonney test versus direct urethral compression and to introduce the Miyazaki-Bonney test. STUDY DESIGN: Thirty-seven patients with a diagnosis of genuine stress incontinence were studied. Each patient underwent a classic Bonney test, direct urethral compression, and a Miyazaki-Bonney test, while the following observations and measurements were made: (1) urethroscopic observation of the bladder neck and proximal urethra, (2) cotton swab resistance to withdrawal, and (3) proximal urethral pressure changes with use of a microtip catheter. In 16 of the patients cough pressure transmission (pressure transmission ratio) to the proximal urethra was measured before and during a Bonney test. Apart from the study group, four patients with clinical type III urethras were evaluated with the Bonney and Miyazaki-Bonney tests. RESULTS: The effects of the Bonney test and direct urethral compression were grossly different on urethroscopy, cotton swab resistance to withdrawal, and proximal urethral pressure changes. With the Bonney test, the average increase in urethral pressure was 52 cm H2O, whereas with direct urethral compression the urethral pressure was >250 cm H2O. With the Miyazaki-Bonney test there was little or no change in urethral pressure. Cough pressure transmission ratios before the Bonney test averaged 64%, whereas during the Bonney test they averaged 152%. The Miyazaki-Bonney tests did not prevent leakage in three patients with type III urethras. CONCLUSION: The Bonney test does not work by direct urethral compression but instead appears to produce continence by restoring the anterior vaginal wall hammock. The Miyazaki-Bonney test duplicates the effects of the Burch bladder neck suspension and may still be a valid prognosticator of surgical success. A modified Bonney test that can be standardized is presented as the Miyazaki-Bonney test.