The inactivation of microorganisms by pulsed magnetic field was studied. It was improved that the application of electromagnetic pulses evidently causes a lethal effect on E. coli cells suspended in phosphate buffer s...The inactivation of microorganisms by pulsed magnetic field was studied. It was improved that the application of electromagnetic pulses evidently causes a lethal effect on E. coli cells suspended in phosphate buffer solution Na 2HPO 4/NaH 2PO 4(0 334/0 867 mmol/L). Experimental results indicated that the survivability(N/N 0; where N 0 and N are the number of cells survived per mill il iter before and after electromagnetic pulses application, respectively) of E. coli decreased with magnetic field intensity B and treatment time t. It was also found that the medium temperatures, the frequencies of pulse f, and the initial bacterial cell concentrations have determinate influences in destruction of E. coli cells by the application of magnetic pulses. The application of an magnetic intensity B=160 mT at pulses frequency f=62 kHz and treatment time t=16 h result in a considerable destruction levels of E. coli cells (N/N 0=10 -4 ). Possible mechanisms involved in sterilization of the magnetic field treatment were discussed. In order to shorten the treatment time, many groups of parallel inductive coil were used. The practicability test showed that the treatment time was shortened to 4 h with the application of three groups of parallel coil when the survivability of E.coli cells was less than 0 01%; and the power consumption was about 0 2 kWh /m 3.展开更多
Purpose:To investigate the fundus and fluorescein angiographic features in the patients with radiation retinopathy.Clinical Materials:Color fundus photography and/or fluorescein angiography from 13 patients with nasop...Purpose:To investigate the fundus and fluorescein angiographic features in the patients with radiation retinopathy.Clinical Materials:Color fundus photography and/or fluorescein angiography from 13 patients with nasopharyngeal carcinomas received external beam radiation were retrospectively analyzed.Reslts:In this study,26 damaged eyes of 13 patients eveloped some degree of radiation retinopathy.The earliest and most common finding was macular microvascular changes (microaneurysms and/or telangiectasia),which was observed in 100%(26/26)of the eyes.Intraretinal hemorrhages,macular capillary nonperfusion,and macular edema were noted in 84%,50%,and 42% of the eyes,respectively.Conclusions:Radiation retinopathy is common after external beam radiation of nasopharyngeal carcinomas.The prominent changes include maular microvascular changes,intraretinal hemorrhages and macular capillary nonperfusion.展开更多
The new curriculum reform has brought new requirements to the primary school mathematics classroom. With the core literacy becoming a hot topic, the cognitive starting point in the primary school mathematics classroom...The new curriculum reform has brought new requirements to the primary school mathematics classroom. With the core literacy becoming a hot topic, the cognitive starting point in the primary school mathematics classroom is getting higher and higher. Cultivating students' abstract thinking in primary school mathematics classroom makes the formation of their mathematical thinking constantly break through the challenge of the critical period. Teachers not only pay attention to students' achievements and progress, but also pay more attention to students' mathematical consciousness, mathematical inquiry ability, scientific mathematical thinking and mathematical practice and application ability. This paper attempts to explain the contents and development strategies of primary school mathematics classroom teaching from the perspective of core literacy, so as to answer the doubts of many primary school mathematics teachers and provide reference for them.展开更多
Huanxiling Oil Production Plant belongs to Liaohe Oil Field Company. In order to ensure the compliance of the enterprise management regulations and standards of the oil production plant, it started with the change of ...Huanxiling Oil Production Plant belongs to Liaohe Oil Field Company. In order to ensure the compliance of the enterprise management regulations and standards of the oil production plant, it started with the change of procurement negotiation mode and timely adjustment of the work plan. The contract approval process is set strictly in accordance with the system requirements. For legal dispute cases, communicate with relevant units immediately, learn about the case in various aspects, collect relevant evidence in a timely manner, sort out the case process and seek solutions. Timely grasp the laws and regulations involved in the oil production plant business, the revision of the system of the oil field company and the dynamic adjustment of the oil production plant organization. Through strengthening basic management and optimizing work processes, coordination meetings attended by heads of engineering departments and grass-roots units were convened several times for the implementation and promotion of the 19 projects of "increasing storage and production, reducing costs and increasing efficiency". Through mutual discussion and communication with heads of engineering departments and grass-roots units, face-to-face discussion and coordination of the indicators and safeguard measures of the plans, unnecessary processes were reduced. Through the compliance management of enterprise management laws and regulations, various indicators of the oil production plant have been successfully completed with remarkable results.展开更多
Under the environment of continuous education reform and curriculum reform, more and more attention has been paid to the core quality education, and the education and teaching at this stage are actively aligning with ...Under the environment of continuous education reform and curriculum reform, more and more attention has been paid to the core quality education, and the education and teaching at this stage are actively aligning with the cultivation of subject core quality. In such a big environment, it is of great practical significance to clarify the core literacy of the discipline and analyze and discuss the education based on the cultivation of the core literacy, which will improve the teaching practice effect in an all-round way. The analysis and study of history teaching in senior high schools will find that in the explanation of teaching points, not only the specific content should be clarified, but also the cultivation of core literacy should be integrated into it. In this way, students will have more historical thinking based on what they have learned, which is significant for the cultivation of students' thinking and the improvement of their learning ability. This paper analyzes the key points of high school history teaching based on the core literacy of the subject, aiming at guiding the teaching practice.展开更多
Novel bulk ZnO porous nanosolids were pre- pared by a unique solvothermal hot-press method, using ZnO nanoparticles and several kinds of solvents as the start- ing materials. It was found from the experiments that ZnO...Novel bulk ZnO porous nanosolids were pre- pared by a unique solvothermal hot-press method, using ZnO nanoparticles and several kinds of solvents as the start- ing materials. It was found from the experiments that ZnO nanoparticles underwent a “self-assembly process” under some specific hydrothermal hot-press conditions. As a result, some “nanoflowers” formed. The results showed that porous nanosolids with uniform pore diameters could be obtained when water distributed uniformly among the ZnO nanopar- ticles. On the contrary, if the uniformity of the distribution of water was poor, “nanoflowers” would appear in the wa- ter-rich region. It was also found that the photoluminescence of ZnO porous nanosolids was affected by the self-assembly phenomenon. In addition, the results also showed that, both the volume and diameters of the pores could be adjusted by changing either the hot-press temperature, pressure or the kinds of solvents.展开更多
Atrial arrhythmia is common in clinic. Recently, it was revealed that ectopicimpulses originating in sleeve muscles around the orifices of pulmonary veins (PVs) were deemed tobe one of the most important reasons that ...Atrial arrhythmia is common in clinic. Recently, it was revealed that ectopicimpulses originating in sleeve muscles around the orifices of pulmonary veins (PVs) were deemed tobe one of the most important reasons that trigger or drive atrial arrhythmia, which was calledmyocardial sleeve related arrhythmia. Electrical isolation by radiofrequency ablation is becominghighlight and proved to be an effective method for the arrhythmia. We report a 55-year-old man withparoxysmal atrial tachy-arrhythmias admitted for PV electrical isolation. An abscess was discoveredin right inferior lung before the operation. The arrhythmia was disappeared after resection of theabscess. It implies that for such sufferer and recidivist after ablation, the factors outside thepulmonary veins should be excluded or treated as far as possible, especially before radiofrequencyablation therapy.展开更多
文摘The inactivation of microorganisms by pulsed magnetic field was studied. It was improved that the application of electromagnetic pulses evidently causes a lethal effect on E. coli cells suspended in phosphate buffer solution Na 2HPO 4/NaH 2PO 4(0 334/0 867 mmol/L). Experimental results indicated that the survivability(N/N 0; where N 0 and N are the number of cells survived per mill il iter before and after electromagnetic pulses application, respectively) of E. coli decreased with magnetic field intensity B and treatment time t. It was also found that the medium temperatures, the frequencies of pulse f, and the initial bacterial cell concentrations have determinate influences in destruction of E. coli cells by the application of magnetic pulses. The application of an magnetic intensity B=160 mT at pulses frequency f=62 kHz and treatment time t=16 h result in a considerable destruction levels of E. coli cells (N/N 0=10 -4 ). Possible mechanisms involved in sterilization of the magnetic field treatment were discussed. In order to shorten the treatment time, many groups of parallel inductive coil were used. The practicability test showed that the treatment time was shortened to 4 h with the application of three groups of parallel coil when the survivability of E.coli cells was less than 0 01%; and the power consumption was about 0 2 kWh /m 3.
文摘Purpose:To investigate the fundus and fluorescein angiographic features in the patients with radiation retinopathy.Clinical Materials:Color fundus photography and/or fluorescein angiography from 13 patients with nasopharyngeal carcinomas received external beam radiation were retrospectively analyzed.Reslts:In this study,26 damaged eyes of 13 patients eveloped some degree of radiation retinopathy.The earliest and most common finding was macular microvascular changes (microaneurysms and/or telangiectasia),which was observed in 100%(26/26)of the eyes.Intraretinal hemorrhages,macular capillary nonperfusion,and macular edema were noted in 84%,50%,and 42% of the eyes,respectively.Conclusions:Radiation retinopathy is common after external beam radiation of nasopharyngeal carcinomas.The prominent changes include maular microvascular changes,intraretinal hemorrhages and macular capillary nonperfusion.
文摘The new curriculum reform has brought new requirements to the primary school mathematics classroom. With the core literacy becoming a hot topic, the cognitive starting point in the primary school mathematics classroom is getting higher and higher. Cultivating students' abstract thinking in primary school mathematics classroom makes the formation of their mathematical thinking constantly break through the challenge of the critical period. Teachers not only pay attention to students' achievements and progress, but also pay more attention to students' mathematical consciousness, mathematical inquiry ability, scientific mathematical thinking and mathematical practice and application ability. This paper attempts to explain the contents and development strategies of primary school mathematics classroom teaching from the perspective of core literacy, so as to answer the doubts of many primary school mathematics teachers and provide reference for them.
文摘Huanxiling Oil Production Plant belongs to Liaohe Oil Field Company. In order to ensure the compliance of the enterprise management regulations and standards of the oil production plant, it started with the change of procurement negotiation mode and timely adjustment of the work plan. The contract approval process is set strictly in accordance with the system requirements. For legal dispute cases, communicate with relevant units immediately, learn about the case in various aspects, collect relevant evidence in a timely manner, sort out the case process and seek solutions. Timely grasp the laws and regulations involved in the oil production plant business, the revision of the system of the oil field company and the dynamic adjustment of the oil production plant organization. Through strengthening basic management and optimizing work processes, coordination meetings attended by heads of engineering departments and grass-roots units were convened several times for the implementation and promotion of the 19 projects of "increasing storage and production, reducing costs and increasing efficiency". Through mutual discussion and communication with heads of engineering departments and grass-roots units, face-to-face discussion and coordination of the indicators and safeguard measures of the plans, unnecessary processes were reduced. Through the compliance management of enterprise management laws and regulations, various indicators of the oil production plant have been successfully completed with remarkable results.
文摘Under the environment of continuous education reform and curriculum reform, more and more attention has been paid to the core quality education, and the education and teaching at this stage are actively aligning with the cultivation of subject core quality. In such a big environment, it is of great practical significance to clarify the core literacy of the discipline and analyze and discuss the education based on the cultivation of the core literacy, which will improve the teaching practice effect in an all-round way. The analysis and study of history teaching in senior high schools will find that in the explanation of teaching points, not only the specific content should be clarified, but also the cultivation of core literacy should be integrated into it. In this way, students will have more historical thinking based on what they have learned, which is significant for the cultivation of students' thinking and the improvement of their learning ability. This paper analyzes the key points of high school history teaching based on the core literacy of the subject, aiming at guiding the teaching practice.
基金supported by the National Natural Science Foundation of China(Grant Nos.50272036,90101016,20473048,and 90206042)the Key Project of Science and Technology Research Program of Ministry of Education(KPSTRP)the Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP).
文摘Novel bulk ZnO porous nanosolids were pre- pared by a unique solvothermal hot-press method, using ZnO nanoparticles and several kinds of solvents as the start- ing materials. It was found from the experiments that ZnO nanoparticles underwent a “self-assembly process” under some specific hydrothermal hot-press conditions. As a result, some “nanoflowers” formed. The results showed that porous nanosolids with uniform pore diameters could be obtained when water distributed uniformly among the ZnO nanopar- ticles. On the contrary, if the uniformity of the distribution of water was poor, “nanoflowers” would appear in the wa- ter-rich region. It was also found that the photoluminescence of ZnO porous nanosolids was affected by the self-assembly phenomenon. In addition, the results also showed that, both the volume and diameters of the pores could be adjusted by changing either the hot-press temperature, pressure or the kinds of solvents.
文摘Atrial arrhythmia is common in clinic. Recently, it was revealed that ectopicimpulses originating in sleeve muscles around the orifices of pulmonary veins (PVs) were deemed tobe one of the most important reasons that trigger or drive atrial arrhythmia, which was calledmyocardial sleeve related arrhythmia. Electrical isolation by radiofrequency ablation is becominghighlight and proved to be an effective method for the arrhythmia. We report a 55-year-old man withparoxysmal atrial tachy-arrhythmias admitted for PV electrical isolation. An abscess was discoveredin right inferior lung before the operation. The arrhythmia was disappeared after resection of theabscess. It implies that for such sufferer and recidivist after ablation, the factors outside thepulmonary veins should be excluded or treated as far as possible, especially before radiofrequencyablation therapy.
