Modeling for nitritation process was discussed and analyzed quantitatively for the factors that influence nitrite accumulation. The results indicated that pH, inorganic carbon source and Hydraulic Retention Time(HRT) ...Modeling for nitritation process was discussed and analyzed quantitatively for the factors that influence nitrite accumulation. The results indicated that pH, inorganic carbon source and Hydraulic Retention Time(HRT) as well as biomass concentration are the main factors that influenced the conversion ratio of ammonium to nitrite. A constant high pH can lead to a high nitritation rate and results in high conversion ratio on condition that free ammonia inhibition do not happen. In a CSTR system, without pH control, this conversion ratio can be monitored by pH variation in the reactor. The pH goes down far from the inlet level means a strongly nitrite accumulation. High concentration of alkalinity can promoted the conversion ratio by means of accelerating the nitritation rate through providing sufficient inorganic carbon source(carbon dioxide). When inorganic carbon source was depleted, the nitritation process stopped. HRT adjustment could be an efficient way to make the nitritation system run more flexible, which to some extent can meet the requirements of the fluctuant of inlet parameters such as ammonium concentration, pH, and temperature and so on. Biomass concentration is the key point, especially for a CSTR system in steady state, which was normally circumscribed by the characteristics of bacteria and may also affected by aeration mode and can be increased by prolonging the HRT on the condition of no nitrate accumulation when no recirculation available. The higher the biomass concentration is, the better the nitrite accumulation can be obtained.展开更多
The analyses of different sulfur forms, the trace elements in pyrites using electron microprobe and the trace elements in coal using INAA (instrumental neutron activation analysis) of the Late Paleozoic coals from the...The analyses of different sulfur forms, the trace elements in pyrites using electron microprobe and the trace elements in coal using INAA (instrumental neutron activation analysis) of the Late Paleozoic coals from the Taozao coalfield in Shandong Province, China, conclude that most sulfur (>75 %) in high-sulfur coal of Taiyuan Formation occurred as pyrite, in which many hazardous elements co-existed and their concentrations varied with their geological origin. The concentrations of hazardous elements in high-sulfur coals from Taiyuan Formation, composing mainly of Cu, As, U, Pb, Mo and Co, are much higher than those in the low-sulfur coals from Shanxi Formation and Shihezi Formation, because the influence of seawater during and after coal accumulation in Taiyuan Formation is stronger than those in Shanxi and Shihezi formations. Moreover, the element As is related to Fe, and both elements exist mainly in the form of pyrite. The element U is richer in the coal influenced by seawater. In addition, the coal affected by the magmatism contains more U, too. When high-sulfur coals are processed with heavy media washing to remove sulfur and minerals, the majority of hazardous elements will also be removed from the coals.展开更多
At the time of the rapid development of economy and society, the construction engineering of our country also ushered in the period of rapid development, and there is a growing concern about the cost of buildings such...At the time of the rapid development of economy and society, the construction engineering of our country also ushered in the period of rapid development, and there is a growing concern about the cost of buildings such as houses. In our country, the unit in charge of the construction cost management is the Housing and Construction Bureau, which is also the key to maintain the order of the construction market and promote the steady development of the construction industry. By using its function to supervise and manage the construction cost, the Housing and Construction Bureau can not only improve the construction quality, but also promote the process of our socialist modernization. Dynamic management can not only effectively control the cost of construction projects, but also provide a favorable basis for administrative approval and punishment, in order to maintain the rationality of project costs, and to ensure the quality and reliability of construction projects. In this paper, first of all, the principles to be followed by the dynamic management and control of construction projects and the main content of its management and control are described, and combined with the current situation of the dynamic management and control of construction project costs, the specific analysis of its existing problems, this paper creatively puts forward the optimization measures of the dynamic management and control of the construction cost in order to contribute to the orderly progress of the contemporary engineering projects in our country.展开更多
Objective: to study the nursing cooperation of patients with percutaneous vestiendoscopic thyroidectomy and breast endoscopic thyroidectomy. Methods: this study was conducted from August 2018 to November 2021. The sub...Objective: to study the nursing cooperation of patients with percutaneous vestiendoscopic thyroidectomy and breast endoscopic thyroidectomy. Methods: this study was conducted from August 2018 to November 2021. The subjects selected patients with percutaneous and percutaneous thyroidectomy received by the hospital. The number of cases was 15 for each operation, and the total number of study cases was 30.Among them, patients who underwent oral vestibular endoscopic thyroidectomy were assigned to test group 1, and patients with transthoracoscopic thyroidectomy were assigned to trial group 2.Statistics and compare, the surgical time, hospital duration, incidence of postoperative complications, and the degree of satisfaction with treatment care. Results: less difference between hospitalization, incidence of postoperative complications and satisfaction with treatment care, higher P-value than 0.05, group 2 had shorter operation than group 1, lower P-value of 0.05, less than group 2, with small difference between groups, and lower P-value than 0.05.Conclusion: transoral vestibular thyroidectomy and transpectomy thyroidectomy meet the aesthetic needs of patients, and the surgical safety is high. However, it takes shorter time and less flow rate after thyroidectomy. At the same time, no matter which surgical method, we need to give the corresponding care cooperation, so as to ensure the smooth operation process, and achieve a good surgical effect.展开更多
The pace of urbanization promote the rapid development of the construction industry, the arrival of the new stage of development and the rapid development of science and technology, promote a variety of new formats. U...The pace of urbanization promote the rapid development of the construction industry, the arrival of the new stage of development and the rapid development of science and technology, promote a variety of new formats. Under the social background of industry competition, take favorable strategic position, and win more development opportunities in order to realize their steady development, and strengthening the cost management ability is the top priority. As the core link throughout the construction project, the cost control quality has a far-reaching impact on the overall level of the construction project. In the context of the rapidly changing industry, it is extremely necessary to give full play to the benefits of construction engineering, and to implement the whole cost control process, the whole factor and the whole life cycle. On the basis of analyzing the significance of strengthening the construction project cost management, this paper makes a shallow analysis of the insufficient optimization cost and cost management, and puts forward several suggestions to optimize the cost management strategy, aiming to provide impetus for the development of the construction industry.展开更多
文摘Modeling for nitritation process was discussed and analyzed quantitatively for the factors that influence nitrite accumulation. The results indicated that pH, inorganic carbon source and Hydraulic Retention Time(HRT) as well as biomass concentration are the main factors that influenced the conversion ratio of ammonium to nitrite. A constant high pH can lead to a high nitritation rate and results in high conversion ratio on condition that free ammonia inhibition do not happen. In a CSTR system, without pH control, this conversion ratio can be monitored by pH variation in the reactor. The pH goes down far from the inlet level means a strongly nitrite accumulation. High concentration of alkalinity can promoted the conversion ratio by means of accelerating the nitritation rate through providing sufficient inorganic carbon source(carbon dioxide). When inorganic carbon source was depleted, the nitritation process stopped. HRT adjustment could be an efficient way to make the nitritation system run more flexible, which to some extent can meet the requirements of the fluctuant of inlet parameters such as ammonium concentration, pH, and temperature and so on. Biomass concentration is the key point, especially for a CSTR system in steady state, which was normally circumscribed by the characteristics of bacteria and may also affected by aeration mode and can be increased by prolonging the HRT on the condition of no nitrate accumulation when no recirculation available. The higher the biomass concentration is, the better the nitrite accumulation can be obtained.
文摘The analyses of different sulfur forms, the trace elements in pyrites using electron microprobe and the trace elements in coal using INAA (instrumental neutron activation analysis) of the Late Paleozoic coals from the Taozao coalfield in Shandong Province, China, conclude that most sulfur (>75 %) in high-sulfur coal of Taiyuan Formation occurred as pyrite, in which many hazardous elements co-existed and their concentrations varied with their geological origin. The concentrations of hazardous elements in high-sulfur coals from Taiyuan Formation, composing mainly of Cu, As, U, Pb, Mo and Co, are much higher than those in the low-sulfur coals from Shanxi Formation and Shihezi Formation, because the influence of seawater during and after coal accumulation in Taiyuan Formation is stronger than those in Shanxi and Shihezi formations. Moreover, the element As is related to Fe, and both elements exist mainly in the form of pyrite. The element U is richer in the coal influenced by seawater. In addition, the coal affected by the magmatism contains more U, too. When high-sulfur coals are processed with heavy media washing to remove sulfur and minerals, the majority of hazardous elements will also be removed from the coals.
文摘At the time of the rapid development of economy and society, the construction engineering of our country also ushered in the period of rapid development, and there is a growing concern about the cost of buildings such as houses. In our country, the unit in charge of the construction cost management is the Housing and Construction Bureau, which is also the key to maintain the order of the construction market and promote the steady development of the construction industry. By using its function to supervise and manage the construction cost, the Housing and Construction Bureau can not only improve the construction quality, but also promote the process of our socialist modernization. Dynamic management can not only effectively control the cost of construction projects, but also provide a favorable basis for administrative approval and punishment, in order to maintain the rationality of project costs, and to ensure the quality and reliability of construction projects. In this paper, first of all, the principles to be followed by the dynamic management and control of construction projects and the main content of its management and control are described, and combined with the current situation of the dynamic management and control of construction project costs, the specific analysis of its existing problems, this paper creatively puts forward the optimization measures of the dynamic management and control of the construction cost in order to contribute to the orderly progress of the contemporary engineering projects in our country.
文摘Objective: to study the nursing cooperation of patients with percutaneous vestiendoscopic thyroidectomy and breast endoscopic thyroidectomy. Methods: this study was conducted from August 2018 to November 2021. The subjects selected patients with percutaneous and percutaneous thyroidectomy received by the hospital. The number of cases was 15 for each operation, and the total number of study cases was 30.Among them, patients who underwent oral vestibular endoscopic thyroidectomy were assigned to test group 1, and patients with transthoracoscopic thyroidectomy were assigned to trial group 2.Statistics and compare, the surgical time, hospital duration, incidence of postoperative complications, and the degree of satisfaction with treatment care. Results: less difference between hospitalization, incidence of postoperative complications and satisfaction with treatment care, higher P-value than 0.05, group 2 had shorter operation than group 1, lower P-value of 0.05, less than group 2, with small difference between groups, and lower P-value than 0.05.Conclusion: transoral vestibular thyroidectomy and transpectomy thyroidectomy meet the aesthetic needs of patients, and the surgical safety is high. However, it takes shorter time and less flow rate after thyroidectomy. At the same time, no matter which surgical method, we need to give the corresponding care cooperation, so as to ensure the smooth operation process, and achieve a good surgical effect.
文摘The pace of urbanization promote the rapid development of the construction industry, the arrival of the new stage of development and the rapid development of science and technology, promote a variety of new formats. Under the social background of industry competition, take favorable strategic position, and win more development opportunities in order to realize their steady development, and strengthening the cost management ability is the top priority. As the core link throughout the construction project, the cost control quality has a far-reaching impact on the overall level of the construction project. In the context of the rapidly changing industry, it is extremely necessary to give full play to the benefits of construction engineering, and to implement the whole cost control process, the whole factor and the whole life cycle. On the basis of analyzing the significance of strengthening the construction project cost management, this paper makes a shallow analysis of the insufficient optimization cost and cost management, and puts forward several suggestions to optimize the cost management strategy, aiming to provide impetus for the development of the construction industry.
