浅谈热网补水定压

1热网定压的重要性及要求热水供暖系统在运行中失水是不可避免的，如果不能及时的补水，系统因缺水而压力下降，从而致使系统不能正常运行。热水供暖系统除了确保及时补水外，安全、经济、稳定运行，与选择合理的定压方式有关。定压方式不同对供暖系统的初投资，静压线的稳定性，以及运行的经济性均有相当大的影响。一般来说，热水供暖系统定压必须保证以下几点要求：（1）系统各点的压力均高于大气压力。（2）系统各点的压力均高于该点水温下的饱和压力。（3）系统各点的压力均不得超过该点部件、设备（散热器等）允许的工作压力。（4）要…     

高炉补水次数变化的原因分析

高炉炼铁的生产过程中,冷却设备所使用的冷却水由于压力高、流量大,水质要求较高,密封装置极易损坏漏水;管道长期运行受到腐蚀,焊缝、砂眼、断裂引起漏水;闭路循环系统多处需要定期排污.冷却设备破损向高炉内漏水,影响炉况及操作.因此正确分析补水原因,对高炉长寿和生产操作、维护极其重要.     

换热站补水定压方式的改进

针对目前生活服务公司１＃ 、２＃ 换热站采用补水泵定压方式所存在的问题，进行了分析，提出了一种新型射流自动补水定压方式。分析了新型射流自动补水定压系统的特点及运行的稳定性和可靠性。     

西钢热电站热水采暖系统补水方式的改进

本文论述了西钢热电站热水采暖系统补水方式改进的必要性和改进方案，措施，此方法可节约一定的能源，缓解西钢冬季用汽的紧张，值得有自备电厂的单位推广应用。     

欢迎征订2008年《矿业快报》

当前普遍采用的内外喷雾存在雾化效果较差、抽尘净化设备体积较大的缺陷，兖州矿业（集团）公司鲍店煤矿与山东科技大学研制出利用S100掘进机自身压力源作动力的机载除尘系统，既有良好的除尘效果，又能适应现场作业条件。     

桩端压力注浆在人工挖孔灌注桩中的应用

以郑州市轻金属研究院为例，探讨了桩端压力注浆技术在人工挖孔灌注桩中应用的基本工艺。该工程基础原设计采用人工挖孔灌注桩，根据施工中出现的实际情况，又采用桩端压力注浆技术，取得了良好的效果。     

高炉软水补水系统稳定性改造

改造前,股份1#高炉软水密闭循环系统补水设备主要由两台多级立式补水泵及变频器控制柜组成,遇系统回水压力波动较大时,补水泵频繁启停,整个管网压力处于不稳定状态,并增加了能耗。通过创新性实施管道改造,利用2#炉软水2台稳压罐为1#炉软水稳压等措施,实现了软水系统稳定节能运行。     

海水用超级双相不锈钢的使用经验

在海上石油天然气工业中，为了确保高生产率，对海水喷射泵有着特别的要求。由于油田变得越来越大，压力越来越高，奥氏体不锈钢泵变得又大又笨，而双相不锈钢强度较高，用来制造泵可减轻泵的重量。然而，在7O年代人们能得到的25Cr双相不锈钢在耐腐蚀和强度方面却不能完全满足要求。为此人们开发了名叫ZERON 100的铸造合金，这是第一代超级双相不锈钢。采用这种材料来制造喷射泵、海水提升泵和消防用水泵非常成功，因而人们又开发了对应的锻造合金。     

水压自封管形阀的结构设计与应用

水压自封管形阀可与管道融为一体，依靠自来水的压力均衡地压住圆锥阀芯关闭阀门，刚性圆锥面密封可靠、耐高压同温、耐腐蚀，能代替闸阀，又能做水龙头，结构简单，操作简便，用途广泛。     

氧化铝工业水节水的方法

随着水资源的日趋紧张，节水问题引起国内外越来越多人的重视，在工业生产中，水的消耗是非常巨大的，节水的潜能也是很大的，本通过技术改造，实现了零排放，节约了水资源。     

粉末压片制样-X射线荧光光谱法测定稀土镁中间合金中镁锰硅钛钙铁

以粉末压片法制样,采用X射线荧光光谱法(XRF)测定稀土镁中间合金中Mg、Mn、Si、Ti、Ca、Fe含量。对样品的矿物效应、样品粒度及成型试验进行了分析研究,通过实验发现利用不同产地的标准样品制作校准曲线,矿物效应影响不大;通过将样品粒度研磨至不大于74μm,能很好的解决粒度效应的影响。精密度实验表明,待测组分的相对标准偏差(RSD,n=10)均不大于2.8%;对来自不同产地的样品进行正确度考察,测定值与国标方法的测定值一致,满足GB/T16477—2010稀土镁中间合金中各组分含量的允许差要求。     

Radioisotope diagnosis in lung diseases]

Following immunization against sheep erythrozytes, it is possible to induce a double-peaked antibody response curve in the serum of experimental animals (rats) by using vincristine sulfate (Vi). Immunosuppression is enhanced in thymectomised and sensitised animals during rechallenge following Vi/Cy, as compared to animals treated with cyclophosphamide (Cy) alone, and an attentuated anamnestic reaction is subsequently observed. Survival time of allogeneic skin grafts in colony bred and inbred rat strains could not be prolonged by using Vi/Cy, as compared to animals treated with Cy alone.     

A new fine probe for electric cautery during endoscopic surgery

The present paper introduces a new fine probe for electric cautery (1.65 mm in diameter, 22 cm long) that can be connected to a conventional cylindrical hand-controlled cautery holder, which is monopolar and widely used in general surgery. When cautery was required, a 14-gauge intravenous catheter was inserted at an appropriate site under the guidance of a videoscope. After removing the steel inner needle, the extra tube was used as the fine surgical port for the cautery probe. The position of insertion could be altered according to the operating field. Cautery was performed by conventional methods. There was no bleeding or air leakage at the site of puncture during or after surgery. The puncture wound was closed without any sutures. Based on these results, the new fine probe for cautery can reduce the number of surgical ports required for instruments during video-assisted surgery, thus improving the ease and safety of endoscopic surgery.     

The guidance of eye movements during active visual search

An analysis of monkey eye movements in classic conjunction and feature search tasks was made. The task was to find and fixate a target in an array of stimuli. Saccades targeted stimuli accurately (red and green bars, 1.25 x 0.25 degrees), landing most of the time within 1.0 degree of the stimulus center and rarely in blank areas far from any stimulus. Monkeys used target color, but not orientation, to selectively guide search. Saccades moved the point of fixation on the average just beyond the area that could be examined by focal attentive mechanisms during the current fixation, as described in a previous paper (Motter BC, Belky EJ. The zone of focal attention during active visual search. Vis Res 1998;38:1007-22). This distance scales with the density of relevant stimuli in the scene. The saccade targeting data suggest that the locations of items of a particular color, but apparently not of a particular orientation, are available outside the region of focal attention. Color feature selection can apparently block the distracting effects of color unique distractors during search.     

Distinct mechanisms for the induction and maintenance of allograft tolerance with CTLA4-Fc treatment

A murine CTLA4/Fc gamma2a heavy chain (mCTLA4-Fc) chimeric fusion molecule was used in B6AF1 recipients of BALB/c pancreatic islet allografts to study the induction and maintenance of tolerance following inhibition of the CD28-B7 pathway for T cell activation. Donor-specific tolerance was achieved by administering 100 microg of mCTLA4-Fc on alternate days for 14 days (8 total doses) or a single 500 microg dose of mCTLA4-Fc on day 2 after transplant. Tolerance was mediated by long-lived peripheral lymphocytes and showed features of organ and alloantigen specificity. Whereas tolerance could not be established in allograft recipients receiving simultaneous mCTLA4-Fc and rIL-2, previously tolerant animals did not reject their grafts when given IL-2, suggesting that the induction and maintenance phases of tolerance were distinct and separate. The maintenance of donor-specific tolerance was an active immunologic process that was CD4+ T cell dependent and could be adoptively transferred to naive lymphocytes, but could not be explained by apoptosis or deletion of alloreactive T cells. Although an IL-2-sensitive mechanism such as anergy may contribute toward the induction of tolerance, its maintenance involves active suppression.     

Smoking behavior in offspring of heart disease patients: A response to cognitive dissonance.

Offspring of heart disease patients, with their variety of health concerns, were compared to a control group with respect to cigarette smoking behavior. Contrary to common-sense expectations, a significantly greater proportion of both male and female offspring were current smokers, and smoked to a greater degree (heavy) than control Ss. The MMPI, however, did not discriminate between Ss on the basis of smoking behavior. In accordance with previous research, it was theorized that the differences observed could be attributed to the higher state of cognitive dissonance associated with cigarette smoking in the offspring group. The fact that a relationship existed between quitting and age, for male and female offspring, suggests that more research is required to study the effects of extreme states of cognitive dissonance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Genetic factors study in family aggregation of schizophrenia in Santiago, Chile

BACKGROUND: Genetic epidemiological studies indicate that genetic factors contribute to a familial aggregation of schizophrenia. The form of inheritance has not been elucidated but most studies have been done in Caucasian populations. AIM: To study the form of inheritance of schizophrenia in an urban population of Santiago, Chile, containing an admixture of Spanish origin individuals with Southamerican aborigines. SUBJECTS AND METHODS: Forty four randomly selected schizophrenic probands, 22 female, aged 28 to 48 years old, were studied. From them, an extensive genealogical reconstitution was performed. Probands and relatives were interviewed using the structured interview CIDI and DSM-III-R check-list. Schizophrenia was diagnosed using DSM-III-R criteria. Complex segregation analysis was done using Pointer program. RESULTS: The hypothesis of a multifactorial inheritance, without the participation of major genes, could not be rejected. Likewise, the major dominant and co-dominant gene forms of transmission could not be rejected. CONCLUSIONS: Our results show the participation of a major dominant locus and a multifactorial component in the inheritance of schizophrenia, as has been reported elsewhere.     

Use of alternate promoters for tissue-specific expression of the gene coding for connexin32

The promoter of rat connexin32 (Cx32), the gap junction protein found in liver, was studied in transgenic mice. Cx32 transgenes, containing 2.5-kb of sequence upstream from the promoter, exon I, the entire 6.1-kb intron and the beginning of the coding sequence linked to the gene encoding luciferase (Luc), were found to be expressed in mouse in the same tissue-specific manner as previously reported for Cx32. Another construct lacking the promoter, but retaining 1.8 kb from the 3' end of the intron, was found to be expressed specifically in the nervous system. This result suggested that a second promoter, different from that used in liver, functions in nervous tissue. The use of this promoter in normal rats was corroborated by sequence analysis of reverse-transcribed PCR products obtained from rat nervous tissue RNA. The second promoter drives the synthesis of a second Cx32 mRNA species that is processed to remove a small 345-bp intron that shares its acceptor splice site with the large intron. This finding could have implications for the genetic basis of the X-linked form of Charcot-Marie-Tooth disease (CMT-X) in those patients that do not exhibit mutations in the Cx32-coding region.     

Action potential fatigue in nonmyelinated nerve fibers: garfish olfactory and rabbit vagus nerve

With the new method the fecal flora of 13 clinically healthy dogs aged 3 to 42 months was analysed qualitatively and quantitatively. It was characterized by that bacteroidaceae constituted the most prodominant flora, catenabacteria, streptococci, peptostreptococci, lactobacilli and bifidobacteria were the next most numerous, enterobacteria consisted the accompanying flora. The numbers of Clostridium perfringens were remarkably fluctuated and seem to be influenced by the composition of the food ingested by the host. The total cultivable counts averaged log 10.8 +/- 0.2/g. The composition of the Lactobacillus flora and Bifidobacterium flora in the feces of 34 dogs from 3 different age groups was analysed. In the feces of all age groups L. acidophilus, L. salivarius and L. fermenti with 9 different types were found. Within the lactobacilli L. acidophilus type VI c, L. salivarius type VI a and L. fermenti type IV b were most frequently found. L. acidophilus types VI c and XI, L. salivarius types VI a and VI b could not be placed in any established types of each species, and were described as new types. Bifidobacteria were regularly found in large numbers in the feces of dogs aged 2 to 24 months. B. adolescentis and B. pseudolongum consisted the main Bifidobacterium flora.     

化学物相分离-电感耦合等离子体原子发射光谱法测定矿石中红柱石

红柱石单纯采用化学分析法不能满足地质要求,必须针对不同矿区的红柱石原矿进行条件实验,测定其单矿物。红柱石经化学物相法分离后可以采取滴定法和重量法测定,但是流程长、操作复杂。实验结合新疆地区红柱石矿的组成特征,对化学物相法分析矿石中红柱石的含量做了初步探讨。试样用氢氟酸-盐酸-硝酸混合酸冷浸过夜,使红柱石与其他伴生矿物分离,过滤后残渣用氢氧化钠熔融,电感耦合等离子体原子发射光谱法(ICP-AES)测定三氧化二铝,使用人工模拟样品中红柱石溶解率求得校正系数,从而换算成红柱石含量。方法用于测定矿石中红柱石,测定结果的相对标准偏差(RSD,n=6)为0.30%～1.9%,与重量法和滴定法结果一致。方法有效解决了红柱石测定流程长、操作复杂的问题,可用于新疆地区红柱石含量的测定。