Decomposition characteristics of toluene by a corona radical shower system.

Non-thermal plasma technologies offer an innovative approach to decomposing various volatile organic compounds(VOCs). The decomposition of toluene from simulated flue gas was investigated using a pipe electrode with nozzles for the generation of free radicals. Corona characteristics and decomposition of toluene were investigated experimentally. In addition, the decomposition mechanism of toluene was explored in view of reaction rate. The experimental results showed that the humidity of additional gas has an important effect on corona characteristics and modes and stable streamer corona can be generated through optimizing flow rate and humidity of additional gas. Applied voltage, concentration of toluene, humidity of toluene and resident time are some important factors affecting decomposition efficiency. Under optimizing conditions, the decomposition efficiency of toluene can reach 80%. These results can give a conclusion that the corona radical shower technology is feasible and effective on the removal of toluene in the flue gas.

[Clinical and pathological characteristics of intracranial haemangioblastoma].

OBJECTIVE: To analyze and summarize the clinical and pathological characteristics of intracranial haemangioblastoma and to improve surgery effect. METHOD: Seventy-two patients with intracranial haemangioblastoma who were proven by operation and pathology from 1970 to 1988 were analyzed retrospectively. RESULTS: Intracranial haemangioblastoma tends to occur in the hemisphere of cerebellum (83 tumours, 87%) and the age of them ranged from 20 to 40 years (47 cases, 58.3%) mostly. The ratio of men (46 cases) was higher than women (26 cases). The diagnosis of the disease depends on CT and MR substantive haemangioblastoma. The most effective and reliable treatment of intracranial haemangioblastoma is surgical resection. CONCLUSION: Intracranial haemangioblastoma is benign tumour which can be, cured by total surgical resection. The key recurrence factors include the young age of initial onset, mistaken exploration and incomplete extirpation of tumour.

[Effect of flue gas conditions on NO oxidation process by DC corona radical shower].

Using an air-H2O DC corona radical shower system, the influences of reside time of flue gas in the reactor, velocity of flue gas and NO concentration on NO oxidation process were studied. The results show that the increasing velocity of flue gas can restrain corona development and the increasing NO concentration can make discharge more easy. The reside time of flue gas in the reactor has less effect on the NO oxidation. The NO oxidation rate increased only from 54.5% to 57.6% at 2 W input power when the reside time of flue gas in the reactor increased from 8.5 s to 34.2 s. However, the velocity of flue gas has important effect on the NO oxidation. At 1.7 W x h/m3 energy density, when the velocity of flue gas increased from 1.4 cm/s to 6.3 cm/s, the NO oxidation rate dropped from 60.0% to 38.6% and the energy yield also falled from 20.8 g/(kW x h) to 13.3 g/(kW x h). Under the certain flux of humid air, NO initial concentration has a best value, which was about 100 x 10(-6) in this experiment.

[Study on the expression of the metastasis suppressor gene KAI1 in laryngeal squamous cell carcinoma].

OBJECTIVE: To investigate the expression of the metastasis suppressor gene KAI1 in laryngeal squamous cell carcinoma and the relationship between expression of KAI1 and it's role in tumorgenesis and development. METHODS: The sections of 84 samples of primary laryngeal squamous cell carcinoma (PLSCC), 27 samples of laryngeal precancerous lesion (LPL), 10 samples of vocal cords polyp (VCP) and 10 samples of normal laryngeal tissues (NLT) were examined by in situ hybridization for KAI1mRNA. RESULTS: It was found that 10 samples of NLT and 10 samples of VCP showed strong expression of KAI1, the Integrated A Total of KIA1 in these two types of tissues were 136,206.8 +/- 36,675.536 and 133,674.505 +/- 42,858.456, respectively, with no statistically significant difference between them, and high prevalence of decreased expression of KAI1 in LPL and PLSCC compared with that in VCP and in NLT (P < 0.01). There was a significant relationship between down-regulation of KAI1 expression with pathological grade, lymph node metastases, T stage and clinical stage (P < 0.01) and did not correlate with gender. CONCLUSION: KAI1 may play an important role on tumor genesis, development, invasion and metastasis of PLSCC, and become one of the molecular markers for early diagnosis and predicting of aggressive and metastasis potential to assess the clinical stage of PLSCC.