黄铜镀液主成分丰缺诊断图

统计了生产中黄铜镀液在镀层质量最佳时的46套主要成分的分析数据,拟订了主要成分铜(A)、锌 (B)和游离氰化钾(C)及成分比值A/B、C/A、C/B的诊断标准,并绘成了诊断图。应用此图来判定镀液成分的丰缺并指导生产中投料,获得了满意的效果。

图法诊断光亮镀镍溶液主成分的丰缺

统计了生产中的光亮镀镍溶液在镀层质量最佳时的 2 4 8套主成分的分析数据 ,拟订了三个主要成分 :硫酸镍 ( A)、氯化镍 ( B)、和硼酸 ( C)及成分比值 A/B、A/C和 B/C的诊断标准 ,并绘成了诊断图。应用此图来判定镀液成分的丰缺并指导生产中投料 ,获得了满意的效果。

电镀溶液成分丰缺的诊断

为了获得电镀的最佳结果,在生产中对珍珠镍、光亮镍、酸性铜和黄铜四种镀液的成分参数进行了统计分析。依据统计数据,确定了这四种镀液的成分比例和诊断标准。运用诊断图表和指数法在生产中判断镀液成分的丰缺,获得了满意的效果。

数字放映机使用维护小知识——放映机液冷系统小知识

目前,很多数字放映机在影院已运行了很多年,它们都健康吗？例如,它们的液冷系统工作得怎样、应该怎样做维护是大家所关心的问题。一般中大型数字放映机的冷却系统是带有液冷的,它使用冷却液来给放映机关键成像部件-光引擎的DMD芯片和光路入口进行冷却散热用的,为保证放映机正常运行需要＂食＂用冷却液,它的主要成分为乙二醇和软化水,呈淡蓝色。可能你会听到,我家的放映机有一年多都没喝冷却液了,机器工作挺正常的,

使用CTP的8项注意

2012年初,我单位引进了一台海德堡超霸A106 CTP,投入生产使用后,在提高出版效率和提升印刷质量方面发挥了积极作用。本文结合笔者实际工作经验,总结了CTP使用中应注意的8点事项。1.维持室内环境稳定每天检查CTP作业室内的温湿度情况。温度应为24~26℃,湿度应为40%~70%。室内应配备加湿除湿机,以方便调节湿度。北方冬季温度较低,空调应24小时开启,使室内昼夜保持合适的温湿度。

PRE-CORROSION FATIGUE NOTCH FACTOR

The notched and smooth specimens of aluminum alloy LC4CS soaked in EXCO solution for different time are tested under the constant amplitude cyclic loading to obtain S-N curves and fatigue notch factors with different pre-corrosion time. By analyzing the corrosion process of LC4CS specimens in EXCO solution, the influ- ence mechanism of corrosion on fatigue notch factor is expounded. Then, a two-parameter model used to describe the change of corrosion fatigue notch factor with time is established and verified by experiment. The results show that the pre-corrosion fatigue notch factor of LC4CS material decreases at first and then increases with the increasing pre-corrosion time. The inflection point appears at the beginning of denudation stage.

磁力泵在醋酐装置中使用问题及解决方案

介绍了磁力离心泵的结构特点,通过在醋酐装置上的使用情况,对出现的问题分析总结,实施了相应的改进措施,确保设备的长周期稳定运行。

工作面泵站变频恒压控制系统

由天地（常州）自动化股份有限公司研制推出的工作面泵站变频恒压控制系统主要针对工作面的乳化液泵、喷雾泵进行控制,实现乳化液泵的变频软启动、按需恒压供液、智能轮换调度、自动配比乳化液、自动补水补液,并控制喷雾泵与采煤机进行联动,实现整个工作面泵站控制系统的远程监控。该系统功能特点：1根据支架用液量,自动调节乳化液泵转速;2除可人工就地启停单台泵外,还可根据工作面是否用液自动启停乳化液泵和喷雾泵，实现工作面泵站与工作面支架、采煤机的联动；③按照等寿命原则，自动启停乳化液泵和喷雾泵，延长供液系统寿命，自动切除故障泵，投入备用泵，缩短系统故障时间；④液箱缺液时，自动配液装置智能启动，完成自动配液、补水、补液；⑤具备RS485或以太网通信接口，能够将系统数据实时上传到地面，通过工业以太环网实现地面远程监控。

从绿茶的产销看价格杠杆的运用

安徽霍山县茶叶在国内外市场享有较高的声誉。八五年有4个品种分别获得部、省优称号,特别是绿茶,占全县茶叶总产量的60%,是出口创汇的拳头产品。但是由于种种原因,绿茶产量一直徘徊在2万—2.2万担之间,不能满足市场需求。

屏蔽泵轴承破裂分析及处理

针对一起典型的屏蔽泵试车过程中发生的轴承损坏事件,从施工和操作进行多方面进行分析,发现故障主要原因是配管施工过程中,在线开孔火焊开孔作业时,部分焊瘤被带入泵腔,最后颗粒随循环管线进入后轴承端面,从而造成推力盘损坏。而在第一次维修时未进行全面分析,造成轴承二次损坏,最后通过合理分析,解决了轴向力过大问题,避免了故障再次发生,从而保证屏蔽泵稳定运行。

Effects of Exogenous Organic Acids on Dehydrogenase Activity in Dark Brown Forest Soils under Nutrient Deficiency

Objective] This study aimed to investigate the effects of exogenous or-ganic acids on dehydrogenase activity in dark brown forest soils under nutrient defi-ciency. [Method] Different proportions of A1 and B horizon dark brown forest soils （A1∶B=1∶2） were utilized to establish soil conditions with nutrient deficiency for cultivation of Larix olgensis seedlings. The effects of oxalic acid, citric acid and succinic acid on dehydrogenase activity in dark brown forest soils under nutrient deficiency were studied systematical y by adding different concentrations of organic acid solutions. [Result] Under nutrient deficiency, dehydrogenase activity in dark brown forest soils was reduced significantly, and the reduction increased with the extension of stress duration. Most organic acid treatments improved dehydrogenase activity in nutrient-deficient dark brown forest soils, and the effects varied with different treatment du-ration and types and concentrations of organic acids. Furthermore, 10.0, 5.0 and 10.0 mmol/L organic acid treatments exhibited the most significant effects on day 10, 20 and 30, respectively. The increment of dehydrogenase activity in different durations showed a downward trend of 30 d〉20 d〉10 d; the improvement effects of three organic acids on dehydrogenase activity showed a downward trend of succinic acid〉 citric acid〉oxalic acid. [Conclusion] Exogenous organic acids improved signifi-cantly dehydrogenase activity in dark brown forest soils under nutrient deficiency and also improved the microbial activity and soil fertility to a certain extent.

Waste Activated Sludge Alkaline Fermentation Liquid as Carbon Source for Biological Nutrients Removal in Anaerobic Followed by Alternating Aerobic-Anoxic Sequencing Batch Reactors

Activated sludge process has been widely used to remove phosphorus and nitrogen from wastewater. However,the nitrogen and phosphorus removal is sometimes unsatisfactory due to the low influent COD.Another problem with the activated sludge process is that large amount of waste activated sludge is produced,which needs further treatment.In this study,the waste activated sludge alkaline fermentation liquid was used as the main carbon source for phosphorus and nitrogen removal under anaerobic followed by alternating aerobic-anoxic conditions,and the results were compared with those using acetic acid as the carbon source.The use of alkaline fermentation liquid not only affected the transformations of phosphorus,nitrogen,intracellular polyhydroxyalkanoates and glycogen, but also led to higher removal efficiencies for phosphorus and nitrogen compared with acetic acid.It was observed that ammonium was completely removed with either alkaline fermentation liquid or acetic acid as the carbon source. However,the former resulted in higher removal efficiencies for phosphorus(95%)and nitrogen(82%),while the latter showed lower ones(87%and 74%,respectively).The presence of a large amount of propionic acid in the alkaline fermentation liquid was one possible reason for its higher phosphorus removal efficiency.Exogenous instead of endogenous denitrification was the main pathway for nitrogen removal with the alkaline fermentation liquid as the carbon source,which was responsible for its higher nitrogen removal efficiency.It seems that the alkaline fermentation liquid can replace acetic acid as the carbon source for phosphorus and nitrogen removal in anaerobic fol- lowed by alternating aerobic-anoxic sequencing batch reactor.

Effect of Zinc Deficiency on Blood Cortisol and ACTH Concentrations,Cerebrum Cortex NO Synthase Activity in Rat

The effects of zinc deficiency on the serum cortisol and adrenocorticotrophic hormone (ACTH) concentration,and the cerebrum nitric oxide synthase (NOS) activity in rats were studied.Growing rats were allotted to three groups,which were zinc deficiency (ZD),paired fed (PF) and zinc supplementation after feeding zinc deficient food for 21 days (ZS).The duration of feed test was 35 days.Compared with PF rats,serum cortisol concentration in ZD ones was significantly increased,whereas serum ACTH concentration and cerebrum NOS activity were significantly decreased.The results suggested that zinc might influence the metabolism of hypothalamic hypophysial adrenocortical axis and NOS.

Organ preconditioning: the past, current status, and related lung studies

Preconditioning (PC) has emerged as a powerful method for experimentally and clinically attenuating various types of organ injuries. In this paper related clinical and basic research issues on organ preconditioning issues were systemically reviewed. Since lung injuries, including ischemia-reperfusion and others, play important roles in many clinical results, including throm-boembolism, trauma, thermal injury, hypovolemic and endotoxin shock, reimplantation response after organ transplantation, and many respiratory diseases in critical care. It is of interest to uncover methods, including the PCs, to protect the lung from the above injuries. However, related studies on pulmonary PC are relatively rare and still being developed, so we will review previous literature on experimental and clinical studies on pulmonary PC in the following paragraphs.

Decreased blood riboflavin levels are correlated with defective expression of RFT2 gene in gastric cancer

AIM:To investigate the relationship between blood riboflavin levels and riboflavin transporter 2(RFT2) gene expression in gastric carcinoma(GC) development.METHODS:High-performance liquid chromatography was used to detect blood riboflavin levels in patients with GC.Real-time fluorogenic quantitative polymerase chain reaction and immunohistochemistry were used to analyze the expression of RFT2 mRNA and protein in samples from 60 GC patients consisting of both tumor and normal tissue.RESULTS:A significant decrease in the RFT2 mRNA levels was detected in GC samples compared with those in the normal mucous membrane(0.398 ± 0.149 vs 1.479 ± 0.587;P = 0.040).Tumors exhibited low RFT2 protein expression(75%,16.7%,8.3% and 0% for no RFT2 staining,weak staining,medium staining and strong staining,respectively),which was significantly lower than that in the normal mucous membrane(10%,16.7%,26.7% and 46.7% for no RFT2 staining,weak staining,medium staining and strong staining,respectively;P < 0.05).Tumors with low RFT2 expression were significantly associated with tumor stage and histological grade.Moreover,a significantly decrease in Uyghur patients was observed compared with Han patients.However,other parameters-gender,tumor location and lymph node metastasis-showed no significant relationship with RFT2 expression.Blood riboflavin levels were reverse correlated with development of GC(1.2000 ± 0.97 569 ng/mL in high tumor stage patients vs 2.5980 ± 1.31 129 ng/mL in low tumor stage patients;P < 0.05).A positive correlation of plasma riboflavin levels with defective expression of RFT2 protein was found in GC patients(2 = 2.619;P = 0.019).CONCLUSION:Defective expression of RFT2 is associated with the development of GC and this may represent a mechanism underlying the decreased plasma riboflavin levels in GC.

Relationship between serum S-100 protein level and ischemic damage degree in patients with acute cerebral infarction

Objective: To investigate the time course of serum S-100 concentrations of patients with acute cerebral infarction,and their relation with the clinical data and the prognosis. Methods: Serum S-100 levels were serially determined in 36 patients with acute cerebral infarction within 12 h, at 24 h and day 2, 3, 4, 5, 7 and 10 after acute cerebral infarction and in 20 age- and sex-matched control subjects. An S-100 content assay was performed using a two-site radioimmunoassay technique. The clinical status was assessed using NIH Stroke Scale. The functional deficit at 4 weeks after acute cerebral infarction was scored using the modified Rankin scale. A cranial computed tomography was performed initially. Results: Elevated concentrations of S-100 (>0.2 μg/L) were observed in 29 of 36 patients with acute cerebral infarction,but none of the control subjects. The S-100 peak levels were at day 2 and 3 after acute cerebral infarction and were significantly high in those patients with severe neurological deficit at admission, with extensive infarction or with space-occupying effect of ischemic edema as compared with the rest of the populations. Conclusion: Serum S-100 level assay can be used as a peripheral marker of ischemic brain damage, and may be helpful for evaluation of therapeutic effects in acute ischemic stroke.

Intestinal microflora in rats with ischemia/reperfusion liver injury

Objectives: To investigate the intestinal microflora status related to ischemia/reperfusion (I/R) liver injury and explore the possible mechanism. Methods: Specific pathogen free grade Sprague-Dawley rats were randomized into three groups: Control group (n=8), sham group (n=6) and I/R group (n=10). Rats in the control group did not receive any treatment, rats in the I/R group were subjected to 20 min of liver ischemia, and rats in the sham group were only subjected to sham operation. Twenty-two hours later, the rats were sacrificed and liver enzymes and malondialdehyde (MDA), superoxide dismutase (SOD), serum endotoxin,intestinal bacterial counts, intestinal mucosal histology, bacterial translocation to mesenteric lymph nodes, liver, spleen, and kidney were studied. Results: Ischemia/reperfusion increased liver enzymes, MDA, decreased SOD, and was associated with plasma endotoxin elevation in the I/R group campared to those in the sham group. Intestinal Bifidobacteria and Lactobacilli decreased and intestinal Enterobacterium and Enterococcus, bacterial translocation to kidney increased in the I/R group compared to the sham group. Intestinal microvilli were lost, disrupted and the interspace between cells became wider in the I/R group.Conclusion: I/R liver injury may lead to disturbance of intestinal microflora and impairment of intestinal mucosal barrier function,which contributes to endotoxemia and bacterial translocation to kidney.

Direct Observation of Transition Metal Dichalcogenides in Liquid with Scanning Tunneling Microscopy

We present atomic-resolution images of TiSe2,MoTe2 and TaS2 single crystals in liquid condition using our home-built scanning tunneling microscopy(STM).By facilely cleaving of single crystals in liquid,we were able to keep the fresh surface not oxidized within a few hours.Using the high-stable home-built STM,we have obtained atomic resolution images of TiSe2 accompanied with the single atom defects as well as the triangle defects in solution for the first time.Besides,the superstructure of MoTe2 and hexagonal chargedensity wave domain structure in nearly commensurate phase of TaS2 were also obtained at room temperature(295 K).Our results provide a more efficient method in investigating the lively surface of transition metal dichalcogenides.Besides,the high stable liquid-phase STM will support the further investigations in liquid-phase catalysis or electrochemistry.

The Study of the Varying Characteristics of Cathodic Regions for Defective Coating in 3.5% Sodium Chloride Solution by EIS and WBE

The current distributions over carbon steel under iron red alkyd primer exposed to 3.5% sodium chloride solution were mapped using the wire beam electrode （WBE）. The electrochemical impedance spectroscopy （EIS） of the WBE was carded out to analyze the performance of coating delamination and corrosion behavior of carbon steel beneath defective coating. The EIS data revealed that protective capability of coating decreased with immersion time and the degree of cathodic delamination showed a rapid rise. The current density distribution of WBE indicated that cathodic sites was located at the defect at the beginning of immersion and gradually spread into the intact coating. The cathodic regions were distinguished from the anodic area and distributed over the WBE. The changes of cathodic sites could reflect the deterioration process of defective coating. The cathodic area ratio was a more useful parameter than the cathodic delamination degree to evaluate the coating cathodic delamination. The polarity reversals of electrodes at the defect and beneath coating were observed. A simple discussion of relationship between the blister and the polarity reversal was made from a standpoint of electrochemical distribution. WBE method was able to map and record the changes of local cathodic sites beneath defective coating in real time, which could provide more detailed information about the local degradation of coating.