共查询到20条相似文献，搜索用时 203 毫秒
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研究了一种热电热泵与热虹吸传热组合的新型快热式热水器.首先,以丙酮为工质,以挠性不锈钢波纹管为蒸汽管和冷凝液管,对一种新型的平板分体式热虹吸装置进行了实验研究,得到了最佳充液率、表面温差分布等性能参数.在此基础上,将热虹吸装置、热电制冷模块、内翅片平板型散热器等进行系统组合为一种新型快热式热水器,对系统各部件的匹配进行了优化,并对各环节进行了传热强化.参照相关技术标准,建立了样机性能测试系统,样机比普通电热水器节省电耗38%以上.该组合型样机具备双循环型热电热泵热水器节能、环保、安全等优势,但比后者系统更为简化,并消除了制约系统整体寿命的瓶颈,更具备技术优越性和应用便利性. 相似文献
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太阳能与双热源热泵组合干燥落叶松 总被引：1，自引：0，他引：1
为进一步降低木材干燥过程的能耗,合理利用太阳能,对北京林业大学研制的太阳能与双热源热泵联合干燥系统的主要参数、原理、结构,进行了说明和系统性能测试。设备在空气源热泵模式下平均供热系数P为2．48,水源热泵模式供热系数P为3．77。使用该系统对落叶松进行初步干燥实验,与常规蒸气干燥做对比,结果显示,热泵干燥和联合干燥与常规蒸气干燥相比分别节能67．8％和70．32％,两者均有明显节能效果。 相似文献
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介绍了空气源热泵热水器的原理及发展前景,设计了冷凝器（储水箱）的形式,并对系统装置进行了试验研究。结果表明,空气源热泵热水器优于常规系统,热泵综合利用装置在制冷兼制热水的运行状况下,可提高系统的制冷性能,减少能耗,而且还能够回收制冷系统的冷凝热量供应热水。 相似文献
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通过对东北管网在役热媒炉的全面调查与测试，提出了热媒炉在热效率、负荷率、空气过剩系数和排烟温度等方面存在的问题，并对这些问题进行了分析。根据分析结果，在提高热媒炉自控技术含量、合理分配负荷、热媒炉尾部防腐等方面提出了相应建议，并在加强热媒炉技术管理方面提出了设想。 相似文献
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王立东 《农村实用科技信息》2011,(2):70-70
就集中供热锅炉房与热电联产供热的经济性和可行性比较、区域室外管网的节能设计及管理、室内供暖的节能设计及系统和管道安装方式等问题进行了调查研究,总结出以下几点,供读者参考。一、室内供暖部分1供暖系统（1）室内供暖系统热媒宜采用低温热水,其供回水温度为95℃/70℃。（2）供暖运行按连续供热运行方式考虑。（3）住宅供暖系统按单元分设,采用单管（带旁通管及三通恒温阀）或双管（带二通恒温阀）同程式上供下回机械循环供暖系统。 相似文献
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为了研究清洁能源替代燃煤的烤烟供热效能,缓解当前环境污染,针对当前热泵存在热效率、余热回收和环境适应性待提高等问题,对闭式热泵烤房与常规开式热泵烤房进行烘烤供热性能分析。结果表明,闭式热泵烤房双压缩机共同协作运行最高功率达14 k W,能够满足烘烤不同阶段的制热要求,系统最高制热系数和烘烤除湿耗能比分别高于开式热泵烤房0.2和0.35 kg/（kW·h）;闭式热泵烤房烘烤过程热泵烤房内温度波动较小,温控精准;在更多装烟量和脱水量的作业条件下,闭式热泵烤房所需烘烤时长较短,同时烘烤得到1 kg干烟的成本比开式热泵烤房低0.08元,并且烤后烟上等烟比例更高。闭式热泵在环保和稳定高效方面具有较好的应用前景。 相似文献
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该文介绍了用太阳能－热泵供热,蒸发排放净化后的弱放射性废水（简称净化水）的模拟试验研究,分析了环境参数（温度、相对湿度）、供风温度及供热量对蒸发量与蒸发能耗的影响,还与韩国的类似设备进行了性能对比．试验证明此种处理净化水的方法是经济、有效可行的 相似文献
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[目的]探明氮肥和Trinexapac-ethyl(TE)对草地早熟禾草坪生长的影响。[方法]采用随机区组设计对草地早熟禾草坪的剪草量及颜色进行评定。其中,氮肥设4个水平:0(N1)、20(N2)、25(N3)、30(N4)kg/(hm2·month),TE设3个水平0(TE1)、312.5(TE2)、625.0(TE3)ml/(hm2·10d)。[结果]不同氮素水平和不同TE水平处理间,剪草量在各个时期差异都达极显著水平(P<0.01);N与TE的互作对草坪草剪草量影响差异不显著;在试验的各个时期,不同氮素水平下,TE2、TE3处理都比TE1处理的剪草量显著降低。不同氮素水平处理间,叶绿素含量在各个时期差异均达极显著水平(P<0.01),不同TE水平处理间以及N与TE的互作效应对草坪叶绿素含量影响在6月份后达到极显著水平(P<0.01)。在试验中,在不同时期4个氮素水平的叶绿素含量均是TE3处理含量高于TE1处理。[结论]在各个氮素水平下,使用TE均能够抑制草坪生长,改善草坪颜色。 相似文献
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Bidirectional signaling between neocortex and limbic cortex has been hypothesized to contribute to the retrieval of long-term memory. We tested this hypothesis by comparing the time courses of perceptual and memory-retrieval signals in two neighboring areas in temporal cortex, area TE (TE) and perirhinal cortex (PRh), while monkeys were performing a visual pair-association task. Perceptual signal reached TE before PRh, confirming its forward propagation. In contrast, memory-retrieval signal appeared earlier in PRh, and TE neurons were then gradually recruited to represent the sought target. A reasonable interpretation of this finding is that the rich backward fiber projections from PRh to TE may underlie the activation of TE neurons that represent a visual object retrieved from long-term memory. 相似文献
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根据临床和实验室标准协会（clinical and laboratory standards institute, CLSI）推荐的微量肉汤稀释法检测泥样中大肠杆菌对四环素的敏感性,并应用PCR法检测四环素耐药基因tetA,tetB,探讨氮磷营养盐对大肠杆菌四环素耐药性影响的可能机制。结果表明：添加不同剂量氮磷营养盐能够导致大肠杆菌对四环素产生耐药性,但大肠杆菌的耐药率与剂量间无明显相关性。37株高耐药率大肠杆菌tetA基因的阳性率为100%,66株低耐药率大肠杆菌tetA基因的阳性率为16.67%,而16株对药物敏感的大肠杆菌未检测到tetA基因;但供试大肠杆菌均未检测到tetB基因。这表明,氮磷营养盐诱导的大肠杆菌四环素耐药性与tetA基因有关。 相似文献
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设X为任意集合,E是X上的一个等价关系.TX表示X上的全变换半群.令TE*(X)={f∈TX:对任意x,y∈X,(x,y)∈E当且仅当(f(x),f(y))∈E},则TE*(X)是TX的一个子半群.文章研究了TE*(X)是富足半群的条件,并描述了使得在半群TE*(X)中有D=J的X上的等价关系E. 相似文献
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Selectivity for 3D shape that reveals distinct areas within macaque inferior temporal cortex 总被引：1，自引：0，他引：1
The anterior part of the macaque inferior temporal cortex, area TE, occupies a large portion of the temporal lobe and is critical for object recognition. Thus far, no relation between anatomical subdivisions of TE and neuronal selectivity has been described. Here, we present evidence that neurons selective for three-dimensional (3D) shape are concentrated in the lower bank of the superior temporal sulcus, whereas neurons in lateral TE are generally unselective for 3D shape, though equally selective for 2D shape. These findings reveal that TE consists of at least two distinct areas, one of which processes a specific object property. 相似文献
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Yin Zhi Guo Jia Bou Gerelchimeg Liu Shi-chao Mu Yan-shuang Liu Zhong-hua 《东北农业大学学报(英文版)》2014,21(3):39-45
Development of tools that can manipulate gene expression specifically and efficiently in the trophectoderm（TE） lineage would greatly aid understanding the roles of different genetic pathways in TE versus embryonic lineages. Here, we showed first time that short-term lentivirus infection of porcine blastocysts could lead to rapid expression of transgene specifically in TE cells. Efficient TE-specific gene knockdown could also be achieved by lentivirus-mediated pol III-driven short hairpin RNA（shRNA） and TE-specific gene expression could be temporal controlled efficiently by combining this system with Tet-On system. This lentivirus lineage-specific infection system would facilitate gene function studies in porcine pre-implatation embryos by specifically knockdown or overexpression of these genes in TE. 相似文献
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The ability of transposable elements (TEs) to insert into or excise out of a genetic locus can be regulated by genetic, environmental, and developmental factors. Tissue- or organ-specific activity of TEs is a frequent and well-characterized example of spatial, developmental regulation. Regulation of the timing of TE activity during ontogeny is less well understood. To analyze timing, TE-induced variegation was quantified in the aleurone of maize kernels, a tissue composed of only a single layer of cells, and sector sizes were assigned to specific cell divisions in aleurone development. Three TE families, Mu, Spm, and Ac/Ds, were studied at two genetic loci. It was found that the frequency of transposon excision changes drastically (up to 30-fold increase or equivalent decrease) during the proliferation of the aleurone. Moreover, these changes occur at the same cell divisions in all three TE families. These results suggest that the timing of TE excision during maize development can be controlled by the host. 相似文献
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Lee E Iskow R Yang L Gokcumen O Haseley P Luquette LJ Lohr JG Harris CC Ding L Wilson RK Wheeler DA Gibbs RA Kucherlapati R Lee C Kharchenko PV Park PJ;Cancer Genome Atlas Research Network 《Science (New York, N.Y.)》2012,337(6097):967-971
Transposable elements (TEs) are abundant in the human genome, and some are capable of generating new insertions through RNA intermediates. In cancer, the disruption of cellular mechanisms that normally suppress TE activity may facilitate mutagenic retrotranspositions. We performed single-nucleotide resolution analysis of TE insertions in 43 high-coverage whole-genome sequencing data sets from five cancer types. We identified 194 high-confidence somatic TE insertions, as well as thousands of polymorphic TE insertions in matched normal genomes. Somatic insertions were present in epithelial tumors but not in blood or brain cancers. Somatic L1 insertions tend to occur in genes that are commonly mutated in cancer, disrupt the expression of the target genes, and are biased toward regions of cancer-specific DNA hypomethylation, highlighting their potential impact in tumorigenesis. 相似文献
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WANG Xiao-ying HU Tian-ming WANG Quan-zhen TIAN Li-min ZHANG Xiao-ling TIAN Kai 《中国农业科学(英文版)》2009,8(12):1498-1502
The experiment aimed to evaluate the effects of N and trinexapac-ethyl （TE） to the growth of Kentucky bluegrass. By using the method of randomized blocks design, 4 N levels, 0 （N1）, 20 （N2）, 25 （N3）, and 30 （N4） kg N ha t mon% with TE at 0 （T1）, 312.5 （T2） and 625 （T3） mL ha-1 every 10 d effect on the total height, clippings and chlorophyll concentration of Kentucky bluegrass were evaluated. Results showed that total height and total clippings of Kentucky bluegrass were reduced by treating with TE and increased by treating with N. Kentucky bluegrass treated with 312.5 and 625 mL ha ＇ per 10 d had total clippings and total height reduced 30 and 45% under different N application level. The N × TE interaction was significant for the chlorophyll concentration of Kentucky bluegrass. The chlorophyll concentration of Kentucky bluegrass treated with TE at 625 mL ha-1 every 10 d was significantly higher than that of Kentucky bluegrass treated with 312.5 mL ha-1 every 10 d at the same N level. The chlorophyll concentration of turfgrass treated with TE at 625 mL ha-1 every 10 d receiving 30 kg N ha -1 month-1 was the highest. Based on the index of turf growth and the chlorophyll concentration, turfgrass receiving 20 or 30 kg N ha-1 month-1 with 625 mL TE ha i every 10 d could balance the problem of mowing frequency and growth quickly while keeping a good quality. 相似文献
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Guangyu Fan Xiuju Bian Huibin Li Zhao Meng Shengyao Liu 《Frontiers of Agriculture in China》2009,3(2):186-189
The practices with low clippings production to save time, money, or landfill space, were favored by turf managers. Understanding
the responses of Kentucky bluegrass (Poa pratensis L.) to Trinexapac-ethyl (TE) would facilitate recommendations regarding its safe and effective use in Northern China. The
objectives of this study are (1) to investigate the effects of TE on vertical growth, clipping yield, leaf width, and chlorophyll
content of Kentucky bluegrass, and (2) to compare the seasonal application impacts of TE. Both spring and autumn experiment
results demonstrated that Trinexapac-ethyl applied to Kentucky bluegrass, suppressed the vertical grass growth and significantly
reduced the Kentucky bluegrass clippings production within a few weeks after initial treatment. Applied trinexapac-ethyl enhanced
Kentucky bluegrass leaf width in both spring and autumn experimental periods. Discoloration on leaf tips was observed and
lasted for four weeks when the same TE rate of 0.191 mL$m-2 was applied in early autumn. Darker leaves with higher chlorophyll
content compared with non-TE-treatments appeared after the initial four weeks of the treatment in autumn and the treatment
for the entire spring. 相似文献