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141.
Ya. O. Shablovskii 《Inorganic Materials》2007,43(12):1345-1349
The pyroelectric properties of lithium sulfate have been studied theoretically on the hypothesis of a pseudosymmetry of the structure of its polar phase. Analytical expressions are proposed for the temperature dependences of its pyroelectric polarization and pyroelectric coefficient at low temperatures and near the polymorphic transformation. The pyroelectric and piezoelectric coefficients of a polar crystal are shown to be in direct proportion. 相似文献
142.
Termites live in a material world: exploration of their ability to differentiate between food sources. 下载免费PDF全文
Ra Inta Joseph C S Lai Eugene W Fu Theodore A Evans 《Journal of the Royal Society Interface》2007,4(15):735-744
Drywood termites are able to assess wood size using vibratory signals, although the exact mechanism behind this assessment ability is not known. Important vibratory characteristics such as the modal frequencies of a wooden block depend on its geometry and boundary conditions; however, they are also dependent on the material characteristics of the block, such as mass, density and internal damping. We report here on choice experiments that tested the ability of the drywood termite Cryptotermes secundus to assess wooden block size using a solid wooden block paired with a composite block, the latter made of either wood and aluminium or wood and rubber. Each composite block was constructed to match mass or low-frequency vibratory modes (i.e. fundamental frequency) of the solid wooden block. The termites always chose the blocks with more wood; they moved to the solid wooden blocks usually within a day and then tunnelled further into the solid wooden block by the end of the experiment. Termites offered composite blocks of wood and rubber matched for mass were the slowest to show a preference for the solid wooden block and this preference was the least definitive of any treatment, which indicated that mass and/or damping may play a role in food assessment. This result clearly shows that the termites were not fooled by composite blocks matched for mass or frequency, which implies that they probably employ more than a single simple measure in their food assessment strategy. This implies a degree of sophistication in their ability to assess their environment hitherto unknown. The potential importance of alternative features in the vibrational signals is discussed. 相似文献
143.
分析煤气温度、干煤气热值和湿煤气热值之间的关系,得到0号机组长期达不到额定出力和效率的原因,在此基础上提出解决问题的方法。 相似文献
144.
145.
IR spectroscopic and x-ray phase analysis established the structural specifics of glasses in the system Na2O-SiO2-TiO2-Na3AlF6, as well as the dependence on the type of crystallizing phases on the chemical composition of the glass matrix. The effect of the structure of titanium-bearing clusters on the leachability of glasses, the effect of the second coordination sphere on the coordination of the central cation (Ti4+), and the propensity of experimental glass coatings to opacification are registered. 相似文献
146.
147.
AB Deisseroth Z Zu D Claxton EG Hanania S Fu D Ellerson L Goldberg M Thomas K Janicek WF Anderson 《Canadian Metallurgical Quarterly》1994,83(10):3068-3076
Relapse after autologous bone marrow transplantation for chronic myelogenous leukemia (CML) can be due either to the persistence of leukemia cells in systemic tissues following preparative therapy, or due to the persistence of leukemia cells in the autologous marrow used to restore marrow function after intensive therapy. To help distinguish between these two possible causes of relapse, we used safety-modified retroviruses, which contain the bacterial resistance gene NEO, to mark autologous marrow cells that had been collected from patients early in the phase of hematopoietic recovery after in vivo chemotherapy. The cells were then subjected to ex vivo CD34 selection following collection and 30% of the bone marrow were exposed to a safety-modified virus. This marrow was infused after delivery of systemic therapy, which consisted of total body irradiation (1,020 cGy), cyclophosphamide (120 mg/kg), and VP-16 (750 mg/m2). RT PCR assays specific for the bacterial NEO mRNA, which was coded for by the virus, and the bcr-abl mRNA showed that in two evaluable CML patients transplanted with marked cells, sufficient numbers of leukemia cells remained in the infused marrow to contribute to systemic relapse. In addition, both normal and leukemic cells positive for the retroviral transgenome persisted in the systemic circulation of the patients for at least 280 days posttransplant showing that the infused marrow was responsible for the return of hematopoiesis following the preparative therapy. This observation shows that it is possible to use a replication-incompetent safety-modified retrovirus in order to introduce DNA sequences into the hematopoietic cells of patients undergoing autologous bone marrow transplantation. Moreover, this data suggested that additional fractionation procedures will be necessary to reduce the probability of relapse after bone marrow transplantation in at least the advanced stages of the disease in CML patients undergoing autologous bone marrow transplantation procedures. 相似文献
148.
研究了经溶液共混制备的聚对苯二甲酸乙二醇酯/聚碳酸酯(PET/PC)共混物的辐射效应。结果表明:PET/PC共混物在辐照过程中未发生酯交换反应和交联反应,但有降解反应发生。在研究的剂量范围内,辐照对PET/PC共混物中PET和PC的晶体形态影响不明显。 相似文献
149.
以YAG为添加剂的气压烧结氮化硅 总被引:2,自引:1,他引:1
本文以添加YAG的反应烧结氮化硅(RBSN)为前驱体,采用气氛加压烧结的工艺,在0.5~9.0MPa氮气压力范围,研究了不同氮压对烧结体的密度、相组成、强度和显微结构的影响及其相互间的关系。研究表明,通过改变氮气压力能有效地调控材料的显微结构,材料的性能又受控于显微结构的变化。 相似文献
150.
Delay-optimal quorum consensus for distributed systems 总被引:1,自引:0,他引:1
Given a set of nodes S, a coterie is a set of pairwise intersecting subsets of S. Each element in a coterie is called a quorum. Mutual exclusion in a distributed system can be achieved if each request is required to gel consensus from a quorum of nodes. This technique of quorum consensus is also used for replicated distributed database systems, and bicoteries and wr-coteries have been defined to capture the requirements of read and write operations in user transactions. The author is interested in finding coteries, bicoteries, and wr-coteries with optimal communication delay. The protocols take into account the network topology. They design delay-optimal quorum consensus protocols for network topologies of trees, rings, and clustered networks 相似文献