Objective: To investigate the application effect of refined nursing care in the care for elderly patients with reflux esophagitis. Methods: Following the difference in nursing style, 84 cases of elderly patients with ...Objective: To investigate the application effect of refined nursing care in the care for elderly patients with reflux esophagitis. Methods: Following the difference in nursing style, 84 cases of elderly patients with reflux esophagitis admitted to our hospital from May 2022 to May 2023 were randomly grouped into a control group and a research group, with 42 cases each. The control group was given conventional nursing care and the research group was given refined nursing care. The psychological state and treatment adherence of the two groups of patients after the nursing intervention were compared. Results: After the nursing intervention, the self-rating anxiety scale (SAS) and self-rating depression scale (SDS) scores of the research group were lower than those of the control group (P < 0.05). The treatment compliance of the research group was better than the control group (P < 0.05). Conclusion: The implementation of refined nursing care for elderly patients with reflux esophagitis exhibited a significant effect on improving the patient’s psychological state, treatment compliance, and rehabilitation.展开更多
Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the producti...Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the production of reclamation area, and the spirit of the Great Wilderness has important strategic significance for the cultivation of agricultural and forestry talents. Taking Heilongjiang Bayi Agricultural University as an example, this paper analyzes the ways of the Great Northern Wilderness Spirit for cultivating application-oriented undergraduate talents in agricultural and forestry colleges, improving the curriculum system of undergraduate talents through innovation, strengthening the cultivation of students’ innovative ability, leading students’ scientific research and academic level, and enhancing students’ practical ability. To innovate the cultivation mode of application-oriented undergraduate talents in agricultural and forestry colleges under the guidance of the spirit of the Great Northern Wilderness, and to provide a reference mode for the cultivation of undergraduate talents in agricultural and forestry colleges in China.展开更多
Objective:To observe and analyze the application of the bedside rhetorical teaching method in teaching nursing interns.Methods:A total of 64 nursing interns in the gastroenterology department of our hospital from July...Objective:To observe and analyze the application of the bedside rhetorical teaching method in teaching nursing interns.Methods:A total of 64 nursing interns in the gastroenterology department of our hospital from July 2022 to May 2023 were randomly divided into two groups,32 cases in the control group and 32 cases in the intervention group.The control group was given conventional teaching methods,and the intervention group was given the bedside rhetorical teaching method on the basis of the conventional teaching.The differences in the methods of teaching between the two groups were compared after the end of the internship,and there was a statistically significant difference with P<0.05.Results:The scores of the interns in the intervention group were significantly better than those of the control group in theoretical knowledge,communication skills,and case analysis items(P<0.05).Conclusion:The bedside rhetorical teaching method transforms classroom education into bedside teaching,which enables the interns to apply the theoretical knowledge to clinical practice,and has a higher improvement in the three aspects of disease knowledge,communication skills,and case analysis,cultivates the interns’comprehensive clinical skills,and lays a good foundation for the future entry into the nursing field.展开更多
The research achievements of solidification theories and technologies in the last decades are reviewed with the stresses on some new development in the recent years. Some new interesting areas emerged in the last year...The research achievements of solidification theories and technologies in the last decades are reviewed with the stresses on some new development in the recent years. Some new interesting areas emerged in the last years are also pointed out.展开更多
The renewal of ancient cities is an important part of the urban renewal work in China.However,there are few studies on the general historical ancient cities at the county level in China,and there is no guidance on the...The renewal of ancient cities is an important part of the urban renewal work in China.However,there are few studies on the general historical ancient cities at the county level in China,and there is no guidance on the renewal path.Through the practice of the renewal design project of Suining County,Xuzhou City,it makes an exploratory study on the renewal concept and mode.It first interprets the connotation and implementation path of the renewal concept of“endowing the old with the new”.Based on the texture analysis of the ancient city of Suining,it finally determines the design theme that tracing the historical context of the ancient city.Using the renewal techniques such as“extraction-transformationactivation”,through the renewal strategies such as“building new space,shaping new landscape,inheriting new culture and pregnant with new environment”,it realizes the regeneration of urban historical context and meets the needs of residents'modern life,so as to provide reference and guidance for the renovation of general historical ancient cities at the county level in China.展开更多
Parasitic disease is one of the most serious diseases in humans and animals. Animal antiparasitic drugs are mainly used to kill, expel and prevent animal parasites, and they are divided into anthelmintics, antiprotozo...Parasitic disease is one of the most serious diseases in humans and animals. Animal antiparasitic drugs are mainly used to kill, expel and prevent animal parasites, and they are divided into anthelmintics, antiprotozoals, insecticides, and so on. Animal antiparasitic drugs play an important role in the prevention and control of animal parasitic diseases, healthy development of animal husbandry and security of public health. In recent years, as people pay more attention paid to parasitic diseases, the research and development of antiparasitic drugs have made great progresses. Mastering the research and application progresses of antiparasitic drugs is of great significance to clinical medication and basic research. This paper reviews the history, current situation, the latest progresses and future development directions of research and application of antiparasitic drugs.展开更多
In recent ten years in China,the application research of hypobaric storage was extended to the non-freeze preservation of cooked food,fresh-cut vegetables,edible fungi and fruits,preliminary processing of growing area...In recent ten years in China,the application research of hypobaric storage was extended to the non-freeze preservation of cooked food,fresh-cut vegetables,edible fungi and fruits,preliminary processing of growing area and vacuum cold fresh chain to the cold chain breakage for horticultural products,and also to the investigation of principle and theory but the investigation results would have some evident difference. This paper will simply summarize the basic conception,principle,two withdrawing air type hypobaric storage technologies,and introduce many examples as mentioned above extending in China. This paper thinks that the master mechanism of preservation of LP for fresh horticultural products effectively inhibits the activity change of manifold enzymes,which are PAL,POD,PPO,CAT,CAD,SOD et al.,affecting the maturation and caducity of fresh horticultural products during LP storage for a short period,as a result,to reduce both risk of physiology obstacle and disease and to prolong their postharvest life; for the foreseeable future Burg's hypobaric storage technology and hypobaric short period treatment technology will play an important role in the preservation on fresh agricultural products and food preservation in storage and transportation,the preliminary processing of growing area,fresh logistics,establishing the operating platform of perishable food and high business value,fresh e-business,and fresh delivery for scattered families,establishing the operating platform of fresh-cut vegetables including edible fungi and so on in China or in the world.展开更多
The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthe...The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthening theory.The puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling system.Such B-grade bulletproof steel plate has fine tempered lath martensite structure.The shooting and certification test results showed that the shoot resistance of B-grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles(GA 164—2005).In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden,the weight of the developed B-grade bulletproof steel plate can be decreased by 8 %under the same shoot resistance condition.It will be meaningful for cash truck and anti-hijacking vehicle to realize light weight,energy conservation and emission reduction.展开更多
China has the biggest rare earths resource in the world,no wonder she pays much at-tention to the application of rare earth metals (REM).The application of REM in iron andsteel in China began at the end of 1950’s.The...China has the biggest rare earths resource in the world,no wonder she pays much at-tention to the application of rare earth metals (REM).The application of REM in iron andsteel in China began at the end of 1950’s.The production of REM-treated iron and steelhad been made steady progress in the period of 1980’s.The production of REM-treatediron and steel in 1989 was 1.4 million tons and 250,000 tons respectively.The interest oftreating steel with REM in China keeps growing even in these years,It comes from the nat-展开更多
History and the principle of laser capture microdissection (LCM): LCM, also known as laser microdissection and pressure catapulting, is one of the most powerful and useful techniques in various research areas where...History and the principle of laser capture microdissection (LCM): LCM, also known as laser microdissection and pressure catapulting, is one of the most powerful and useful techniques in various research areas where isolation of heterogeneous cell population is required. The first use of laser as a cell operation method, was originated in early 1920s (Gilbrich-Wille, 2013), and it became widely used as a microsurgical tool ill early 1960s. In the need of extremely small tissue isolation, laser beam of LCM has been modified and developed over several decades from Ultraviolet (UV) laser beam to high-energy nitrogen, infrared and carbon dioxide lasers (Gilbrich-Wille,展开更多
Translational Cancer Research (Transl Cancer Res; TCR; Print ISSN: 2218-676X; Online ISSN 2219-6803; www. thetcr.org) launched in August 2013 a special issue on Applications of Nanotechnology in Radiation Research ...Translational Cancer Research (Transl Cancer Res; TCR; Print ISSN: 2218-676X; Online ISSN 2219-6803; www. thetcr.org) launched in August 2013 a special issue on Applications of Nanotechnology in Radiation Research inviting Prof. Rao V.L. Papineni from University of Kansas Medical Center, Pataje G.S. Prasanna from National Cancer Institute and Mansoor M. Ahmed, National Cancer Institute to serve as the Guest Editors.展开更多
Antibiotics plays a positive role in the development of livestock breeding and feed industry,but has also disadvantages impossible to overcome,so it is an inevitable trend of prohibiting application of antibiotics in ...Antibiotics plays a positive role in the development of livestock breeding and feed industry,but has also disadvantages impossible to overcome,so it is an inevitable trend of prohibiting application of antibiotics in feed.This paper reviewed concept and action mechanism of the antibiotics substitute—probiotics,and its application in piglets,growing and fattening pigs and sows.展开更多
In the present paper, the authors review recent situations of clinical application of Neiguan (PC 6内关), etc. in the treatment of disorders of the digestive system and its related research progresses. In clinical pra...In the present paper, the authors review recent situations of clinical application of Neiguan (PC 6内关), etc. in the treatment of disorders of the digestive system and its related research progresses. In clinical practice, Neiguan (PC 6) is usually selected as one of the main acupoints to treat gastrointestinal reactions induced by ① nausea and vomiting, ② hiccup, ③ gastrointestinal dyskinesia, ④ gastritis, and ⑤ intra-gastric examination, cesarean section, etc. Concerning experimental studies, the effects of Neiguan (PC 6), etc. on ① gastric electrical activities, ② gastrointestinal motion, ③ gastrointestinal hormone secretion, and ④ gastric mucosal structure were observed. Results indicated that Neiguan (PC 6) is an important and effective acupoint for treatment of gastrointestinal disorders in clinic. Stimulation of Neiguan (PC 6) induced favorable regulation of both the peripheral nervous system and central nervous system, and changes of the gastrointestinal hormone secretion may contribute to its effects in treating various disorders.展开更多
Three logarithmic linear equations between D_(Me)^(V/L) and [m_(NaCl)], and the relationship of D_(Me)^(V/L) versus F/Cl or K/Na mole ratios have been established by the experiments of the partitioning of Pb and Zn be...Three logarithmic linear equations between D_(Me)^(V/L) and [m_(NaCl)], and the relationship of D_(Me)^(V/L) versus F/Cl or K/Na mole ratios have been established by the experiments of the partitioning of Pb and Zn between granitic silicate melt and aqueous fluid. These results have been used to quantitatively study some essential problems, such as the possibility and degree of Pb-Zn mineralization in the system of granitic magma and hydrothermal fluid, and the influence of the relative contents of alkali and volatiles on the Pb-Zn mineralization in the same system. Some new points have been put forward in this paper.展开更多
Research and application of big data mining,at present,is a hot issue. This paper briefly introduces the basic ideas of big data research, analyses the necessity of big data application in earthquake precursor observa...Research and application of big data mining,at present,is a hot issue. This paper briefly introduces the basic ideas of big data research, analyses the necessity of big data application in earthquake precursor observation,and probes certain issues and solutions when applying this technology to work in the seismic-related domain. By doing so,we hope it can promote the innovative use of big data in earthquake precursor observation data analysis.展开更多
There are abundant water power resources in the Yalong River which are suitable for the large hydroelectric engineering. But a reliability study should be made for the valley which liable to frequent earthquakes. The ...There are abundant water power resources in the Yalong River which are suitable for the large hydroelectric engineering. But a reliability study should be made for the valley which liable to frequent earthquakes. The color infrared aerophotos, multi-spectral photography and thermal infrared scanning had been specially done besides MSS image, processing. Researches on remote sensing applications to engineering geology, hydrogeology, deformation of neo-tectonics, Iandslide, mud-rock flow, ecological environment and geographical information system had been carried out by more than 20 research units.展开更多
According to the rotor vortex theory,the rotor circulation and the rotor induced velocity are developed into Fourier series.The circulation distribution along blade spanwise is expressed in terms of segment-by-segment...According to the rotor vortex theory,the rotor circulation and the rotor induced velocity are developed into Fourier series.The circulation distribution along blade spanwise is expressed in terms of segment-by-segment linear functions.In consequence the induced velocity equations and the circulation equations are derived.The engineering application of the rotor vortex theory is provided.Then the induced velocity and its harmonic components are obtained to provide a quantitative basis for the vortex model.For calculating each harmonic component of the induced velocity a simplified method is put forward which considers the effects of each order circulation with neglecting those of higher order.The method saves the computer time and is of significant benefit.展开更多
Chitosan,a renewable,non-toxic,and natural cationic polyelectrolyte,can be combined with many anionic polyelectrolytes(such as sodium alginate,hyaluronic acid,xylan,and gelatin)via electrostatic forces to form chitosa...Chitosan,a renewable,non-toxic,and natural cationic polyelectrolyte,can be combined with many anionic polyelectrolytes(such as sodium alginate,hyaluronic acid,xylan,and gelatin)via electrostatic forces to form chitosan-based polyelectrolyte composites under certain conditions.This review summarizes various methods of preparing chitosan-based polyelectrolyte composites and analyzes their applications in clinical medicine and agriculture,as well as pharmaceutical,tissue,food,environmental,and textile engineering fields.The future development direction and potential of chitosan-based polyelectrolytes are also discussed.展开更多
文摘Objective: To investigate the application effect of refined nursing care in the care for elderly patients with reflux esophagitis. Methods: Following the difference in nursing style, 84 cases of elderly patients with reflux esophagitis admitted to our hospital from May 2022 to May 2023 were randomly grouped into a control group and a research group, with 42 cases each. The control group was given conventional nursing care and the research group was given refined nursing care. The psychological state and treatment adherence of the two groups of patients after the nursing intervention were compared. Results: After the nursing intervention, the self-rating anxiety scale (SAS) and self-rating depression scale (SDS) scores of the research group were lower than those of the control group (P < 0.05). The treatment compliance of the research group was better than the control group (P < 0.05). Conclusion: The implementation of refined nursing care for elderly patients with reflux esophagitis exhibited a significant effect on improving the patient’s psychological state, treatment compliance, and rehabilitation.
文摘Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the production of reclamation area, and the spirit of the Great Wilderness has important strategic significance for the cultivation of agricultural and forestry talents. Taking Heilongjiang Bayi Agricultural University as an example, this paper analyzes the ways of the Great Northern Wilderness Spirit for cultivating application-oriented undergraduate talents in agricultural and forestry colleges, improving the curriculum system of undergraduate talents through innovation, strengthening the cultivation of students’ innovative ability, leading students’ scientific research and academic level, and enhancing students’ practical ability. To innovate the cultivation mode of application-oriented undergraduate talents in agricultural and forestry colleges under the guidance of the spirit of the Great Northern Wilderness, and to provide a reference mode for the cultivation of undergraduate talents in agricultural and forestry colleges in China.
文摘Objective:To observe and analyze the application of the bedside rhetorical teaching method in teaching nursing interns.Methods:A total of 64 nursing interns in the gastroenterology department of our hospital from July 2022 to May 2023 were randomly divided into two groups,32 cases in the control group and 32 cases in the intervention group.The control group was given conventional teaching methods,and the intervention group was given the bedside rhetorical teaching method on the basis of the conventional teaching.The differences in the methods of teaching between the two groups were compared after the end of the internship,and there was a statistically significant difference with P<0.05.Results:The scores of the interns in the intervention group were significantly better than those of the control group in theoretical knowledge,communication skills,and case analysis items(P<0.05).Conclusion:The bedside rhetorical teaching method transforms classroom education into bedside teaching,which enables the interns to apply the theoretical knowledge to clinical practice,and has a higher improvement in the three aspects of disease knowledge,communication skills,and case analysis,cultivates the interns’comprehensive clinical skills,and lays a good foundation for the future entry into the nursing field.
文摘The research achievements of solidification theories and technologies in the last decades are reviewed with the stresses on some new development in the recent years. Some new interesting areas emerged in the last years are also pointed out.
文摘The renewal of ancient cities is an important part of the urban renewal work in China.However,there are few studies on the general historical ancient cities at the county level in China,and there is no guidance on the renewal path.Through the practice of the renewal design project of Suining County,Xuzhou City,it makes an exploratory study on the renewal concept and mode.It first interprets the connotation and implementation path of the renewal concept of“endowing the old with the new”.Based on the texture analysis of the ancient city of Suining,it finally determines the design theme that tracing the historical context of the ancient city.Using the renewal techniques such as“extraction-transformationactivation”,through the renewal strategies such as“building new space,shaping new landscape,inheriting new culture and pregnant with new environment”,it realizes the regeneration of urban historical context and meets the needs of residents'modern life,so as to provide reference and guidance for the renovation of general historical ancient cities at the county level in China.
基金Supported by Earmarked Fund for China Agriculture Research System(CAR-38)Twelfth Five-Year National Key Technology Research and Development Program(2015BAD1101)~~
文摘Parasitic disease is one of the most serious diseases in humans and animals. Animal antiparasitic drugs are mainly used to kill, expel and prevent animal parasites, and they are divided into anthelmintics, antiprotozoals, insecticides, and so on. Animal antiparasitic drugs play an important role in the prevention and control of animal parasitic diseases, healthy development of animal husbandry and security of public health. In recent years, as people pay more attention paid to parasitic diseases, the research and development of antiparasitic drugs have made great progresses. Mastering the research and application progresses of antiparasitic drugs is of great significance to clinical medication and basic research. This paper reviews the history, current situation, the latest progresses and future development directions of research and application of antiparasitic drugs.
文摘In recent ten years in China,the application research of hypobaric storage was extended to the non-freeze preservation of cooked food,fresh-cut vegetables,edible fungi and fruits,preliminary processing of growing area and vacuum cold fresh chain to the cold chain breakage for horticultural products,and also to the investigation of principle and theory but the investigation results would have some evident difference. This paper will simply summarize the basic conception,principle,two withdrawing air type hypobaric storage technologies,and introduce many examples as mentioned above extending in China. This paper thinks that the master mechanism of preservation of LP for fresh horticultural products effectively inhibits the activity change of manifold enzymes,which are PAL,POD,PPO,CAT,CAD,SOD et al.,affecting the maturation and caducity of fresh horticultural products during LP storage for a short period,as a result,to reduce both risk of physiology obstacle and disease and to prolong their postharvest life; for the foreseeable future Burg's hypobaric storage technology and hypobaric short period treatment technology will play an important role in the preservation on fresh agricultural products and food preservation in storage and transportation,the preliminary processing of growing area,fresh logistics,establishing the operating platform of perishable food and high business value,fresh e-business,and fresh delivery for scattered families,establishing the operating platform of fresh-cut vegetables including edible fungi and so on in China or in the world.
文摘The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthening theory.The puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling system.Such B-grade bulletproof steel plate has fine tempered lath martensite structure.The shooting and certification test results showed that the shoot resistance of B-grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles(GA 164—2005).In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden,the weight of the developed B-grade bulletproof steel plate can be decreased by 8 %under the same shoot resistance condition.It will be meaningful for cash truck and anti-hijacking vehicle to realize light weight,energy conservation and emission reduction.
文摘China has the biggest rare earths resource in the world,no wonder she pays much at-tention to the application of rare earth metals (REM).The application of REM in iron andsteel in China began at the end of 1950’s.The production of REM-treated iron and steelhad been made steady progress in the period of 1980’s.The production of REM-treatediron and steel in 1989 was 1.4 million tons and 250,000 tons respectively.The interest oftreating steel with REM in China keeps growing even in these years,It comes from the nat-
文摘History and the principle of laser capture microdissection (LCM): LCM, also known as laser microdissection and pressure catapulting, is one of the most powerful and useful techniques in various research areas where isolation of heterogeneous cell population is required. The first use of laser as a cell operation method, was originated in early 1920s (Gilbrich-Wille, 2013), and it became widely used as a microsurgical tool ill early 1960s. In the need of extremely small tissue isolation, laser beam of LCM has been modified and developed over several decades from Ultraviolet (UV) laser beam to high-energy nitrogen, infrared and carbon dioxide lasers (Gilbrich-Wille,
文摘Translational Cancer Research (Transl Cancer Res; TCR; Print ISSN: 2218-676X; Online ISSN 2219-6803; www. thetcr.org) launched in August 2013 a special issue on Applications of Nanotechnology in Radiation Research inviting Prof. Rao V.L. Papineni from University of Kansas Medical Center, Pataje G.S. Prasanna from National Cancer Institute and Mansoor M. Ahmed, National Cancer Institute to serve as the Guest Editors.
文摘Antibiotics plays a positive role in the development of livestock breeding and feed industry,but has also disadvantages impossible to overcome,so it is an inevitable trend of prohibiting application of antibiotics in feed.This paper reviewed concept and action mechanism of the antibiotics substitute—probiotics,and its application in piglets,growing and fattening pigs and sows.
文摘In the present paper, the authors review recent situations of clinical application of Neiguan (PC 6内关), etc. in the treatment of disorders of the digestive system and its related research progresses. In clinical practice, Neiguan (PC 6) is usually selected as one of the main acupoints to treat gastrointestinal reactions induced by ① nausea and vomiting, ② hiccup, ③ gastrointestinal dyskinesia, ④ gastritis, and ⑤ intra-gastric examination, cesarean section, etc. Concerning experimental studies, the effects of Neiguan (PC 6), etc. on ① gastric electrical activities, ② gastrointestinal motion, ③ gastrointestinal hormone secretion, and ④ gastric mucosal structure were observed. Results indicated that Neiguan (PC 6) is an important and effective acupoint for treatment of gastrointestinal disorders in clinic. Stimulation of Neiguan (PC 6) induced favorable regulation of both the peripheral nervous system and central nervous system, and changes of the gastrointestinal hormone secretion may contribute to its effects in treating various disorders.
文摘Three logarithmic linear equations between D_(Me)^(V/L) and [m_(NaCl)], and the relationship of D_(Me)^(V/L) versus F/Cl or K/Na mole ratios have been established by the experiments of the partitioning of Pb and Zn between granitic silicate melt and aqueous fluid. These results have been used to quantitatively study some essential problems, such as the possibility and degree of Pb-Zn mineralization in the system of granitic magma and hydrothermal fluid, and the influence of the relative contents of alkali and volatiles on the Pb-Zn mineralization in the same system. Some new points have been put forward in this paper.
基金sponsored by the Earthquake Monitoring Special Project of "Precursor Observation Data Mining",Key Laboratory of Crustal Dynamics,Institute of Crustal Dynamics,China Earthquake Administration
文摘Research and application of big data mining,at present,is a hot issue. This paper briefly introduces the basic ideas of big data research, analyses the necessity of big data application in earthquake precursor observation,and probes certain issues and solutions when applying this technology to work in the seismic-related domain. By doing so,we hope it can promote the innovative use of big data in earthquake precursor observation data analysis.
文摘There are abundant water power resources in the Yalong River which are suitable for the large hydroelectric engineering. But a reliability study should be made for the valley which liable to frequent earthquakes. The color infrared aerophotos, multi-spectral photography and thermal infrared scanning had been specially done besides MSS image, processing. Researches on remote sensing applications to engineering geology, hydrogeology, deformation of neo-tectonics, Iandslide, mud-rock flow, ecological environment and geographical information system had been carried out by more than 20 research units.
文摘According to the rotor vortex theory,the rotor circulation and the rotor induced velocity are developed into Fourier series.The circulation distribution along blade spanwise is expressed in terms of segment-by-segment linear functions.In consequence the induced velocity equations and the circulation equations are derived.The engineering application of the rotor vortex theory is provided.Then the induced velocity and its harmonic components are obtained to provide a quantitative basis for the vortex model.For calculating each harmonic component of the induced velocity a simplified method is put forward which considers the effects of each order circulation with neglecting those of higher order.The method saves the computer time and is of significant benefit.
文摘Chitosan,a renewable,non-toxic,and natural cationic polyelectrolyte,can be combined with many anionic polyelectrolytes(such as sodium alginate,hyaluronic acid,xylan,and gelatin)via electrostatic forces to form chitosan-based polyelectrolyte composites under certain conditions.This review summarizes various methods of preparing chitosan-based polyelectrolyte composites and analyzes their applications in clinical medicine and agriculture,as well as pharmaceutical,tissue,food,environmental,and textile engineering fields.The future development direction and potential of chitosan-based polyelectrolytes are also discussed.