Most researches associated with target encircling control are focused on moving along a circular orbit under an ideal environment free from external disturbances.However,elliptical encirclement with a time-varying obs...Most researches associated with target encircling control are focused on moving along a circular orbit under an ideal environment free from external disturbances.However,elliptical encirclement with a time-varying observation radius,may permit a more flexible and high-efficacy enclosing solution,whilst the non-orthogonal property between axial and tangential speed components,non-ignorable environmental perturbations,and strict assignment requirements empower elliptical encircling control to be more challenging,and the relevant investigations are still open.Following this line,an appointed-time elliptical encircling control rule capable of reinforcing circumnavigation performances is developed to enable Unmanned Aerial Vehicles(UAVs)to move along a specified elliptical path within a predetermined reaching time.The remarkable merits of the designed strategy are that the relative distance controlling error can be guaranteed to evolve within specified regions with a designer-specified convergence behavior.Meanwhile,wind perturbations can be online counteracted based on an unknown system dynamics estimator(USDE)with only one regulating parameter and high computational efficiency.Lyapunov tool demonstrates that all involved error variables are ultimately limited,and simulations are implemented to confirm the usability of the suggested control algorithm.展开更多
The Russian Federation unilaterally invaded the Republic of Ukraine＇s Crimean Peninsula, then commenced to occupy more of Eastern Ukraine on the transparent pretext of protecting Russian speakers in 2014, using mask...The Russian Federation unilaterally invaded the Republic of Ukraine＇s Crimean Peninsula, then commenced to occupy more of Eastern Ukraine on the transparent pretext of protecting Russian speakers in 2014, using masked ＂zombie＂ fighters but denied that they were uniformed Russian soldiers, violating several agreements from 1954 to 1994 and legitimate international expectations before and afterwards. Elections were held, seriatim, one alter another, contrived supposedly to reflect the wishes of ethnic Russians in cities along Ukraine＇s eastern border, results of which triggered declarations by separatists of ＂independence＂ followed by formation of ＂people＇s republics＂ as city states. What this signifies is a clash of cultural expectations： of core values, both in the hearts and minds of all parties involved, and in the methods chosen by Russian Federation and Ukrainian independence movement leaders compared with Western governments. If Russia is revoking its transfer of the Crimea to Ukraine on an assertion that such transfer 60 years back was improvident then the Western Alliance should respond by revoking the Potsdam Declaration and other agreements investing Russia with control of Krnigsberg （renamed Kaliningrad） including the Treaty of Paris, and possibly revoking commitments made improvidently at the Teheran and Yalta summit conferences, transferring what was Eastern Poland west of the Curzon Line to the Soviet Union and eventually to Ukraine. If the West will tolerate a Russian siege of Crimea, it should forthwith impose an Allied siege of Kaliningrad and occupy that oblast immediately, retuming Krnigsberg to sovereignty under Lithuanian or Polish and EU control with annexation as a NATO base. What the West with NATO must do is to fight encirclement with encirclement including military, information, economic, trade encirclement as part of what is termed ＂hybrid warfare＂. Stopping military advancement eastward into Europe is only one prong of the problem. Another is Greece, a country that has formed the foundation of the defense of Europe to its own economic detriment. Ukraine as a hot spot is the consequence of China＇s ambition to partner with Ukraine in construction of a post-Panamax deep water cargo port on the Crimean peninsula, prompting Russian Federation opposition （Chinese Billionaire, 2013）. This paper proposes that China transfer its deep water port to Greece fund it through a new East Europe Infrastructure Investment Bank （EEIIB）, achieve the same USD Trillion annual trade influx into the European Union, relieve Greece＇s agony without austerity by inaugurating a Chinese ＂Marshall Plan＂ to become the ＂Chen Yi Plan＂, relieve Greece＇s economic agony without imposing austerity by relocating China＇s planned deep water post-Panamax mega-port from Yevpatoria in Crimean Peninsula to a suitable Greek port, thereby making Greece sustainably rich much as the Marshall Plan did for post-war Germany.展开更多
As mankind was one kind of aesthetic species,the visual study of Marxist philosophy has profound enlightenment in understanding the New Year paintings' visual meaning,form,development,cultivation,and features etc....As mankind was one kind of aesthetic species,the visual study of Marxist philosophy has profound enlightenment in understanding the New Year paintings' visual meaning,form,development,cultivation,and features etc.In essence,Chinese folk New Year paintings is a visual expression,its nature of being pasted at home makes it a visual encirclement for the Chinese people,this vision encirclement in the home space gradually expands,constitutes a spiritual home with different cultural space,living environment,image schema,and secular and religious faith scope,in this visual encirclement,people's home life achieves the satisfaction,peace and self–comfort in diversity.The"childrenization"of New Year paintings reveals a close relationship between the immature of folk art and the original art as human childhood,and from the both aspects of form and content reflects the visual encirclement is actually a kind of siege with cultural significance,this siege has multiple levels in value ideas,historical tradition,ethical order and life knowledge,aesthetic taste and so on,makes us have a new aesthetic anthropology on the New Year paintings.展开更多
An efficient method for the isolation and purification of 12,13-dihydroxyeuparin from Radix Eupatorii Chinensis by high speed counter-current chromatography (HSCCC) was established in this paper. The ether extracts of...An efficient method for the isolation and purification of 12,13-dihydroxyeuparin from Radix Eupatorii Chinensis by high speed counter-current chromatography (HSCCC) was established in this paper. The ether extracts of Radix Eupatorii Chinensis were purified by HSCCC with a solvent system of hexyl hydride-ethyl acetate-methanol-water (1:2:1:2, v/v/v/v). The upper phase was used as the stationary phase and the lower phase as the mobile phase. About 8.4 mg of 12, 13-dihydroxyeuparin was obtained from 200 mg of ether extracts from Radix Eupatorii Chinensis in one-step HSCCC separation, with the purity of 96.71%, as determined by HPLC. After methanol- water recrystallization, the purity of 12,13-dihydroxyeuparin reached 99.83%. Such a simple and effective method was fairly useful to prepare pure compound as reference substances for related study on Radix Eupatorii Chinensis.展开更多
AIM: To evaluate the effect of scleral encircling bands on the development and progression of diabetic retinopathy(DR) in diabetic patients.METHODS: The medical records of diabetic patients who underwent unilateral re...AIM: To evaluate the effect of scleral encircling bands on the development and progression of diabetic retinopathy(DR) in diabetic patients.METHODS: The medical records of diabetic patients who underwent unilateral retinal detachment(RD) surgery using scleral buckle and encircling band were reviewed retrospectively. Both eyes of patients were included in the study: one eye in each patient had a scleral buckle with encircling band(the operated eye) and the other one is the non-operated eye. The demographic characters, duration of diabetes and period between surgery and the last recall visit were retrieved from each patient. All the cases underwent fundus photo and fluorescein angiography(when indicated) to confirm the DR staging.RESULTS: Totally 25 patients fulfilled the inclusion and the exclusion criteria were become eligible for the study. A total of 50 eyes of 25 patients were enrolled in this analysis. The mean period of time passed from surgery with encircling band and the last reassessment visit was 12.5±2 y. Even though DR could develop in the operated eyes, it was at a less degree of severity compared to the non-operated eyes of same patients(P=0.027).CONCLUSION: Scleral encircling bands have protective effects against the development and progression of DR.展开更多
Chronic venous incompetence of the lower extramities is a common disease whose etilogy and surgical treatment has been proposed by several authors. Histner (1975) discribed primary valvular incompetency and the effect...Chronic venous incompetence of the lower extramities is a common disease whose etilogy and surgical treatment has been proposed by several authors. Histner (1975) discribed primary valvular incompetency and the effect of valvuloplasty. By the usage of phlebographe, we found that the cause of valvular incompetence was the dilatation of venous lumen, which made the valve relatively smaller. The function of valve may be restored by the circular suture of femoral vein wall below the first valve so as to reduce the dilated venous lumen. during the period from 1984 to 1994, 151 cases have been treated by this new technique. This report presents our experience in using encircling constricting suture method of the femoral venous wall.展开更多
AIM： To observe the changes of vitreous cavity length and diopter after scleral encircling（SE） produce.·METHODS： This prospective study included 68 eyes of68 non-consecutive patients with macula-off retinal d...AIM： To observe the changes of vitreous cavity length and diopter after scleral encircling（SE） produce.·METHODS： This prospective study included 68 eyes of68 non-consecutive patients with macula-off retinal detachment who were operated by SE surgery. The corneal refractive power, ocular axial length and diopter were measured by keratometer, A-mode ultrasonic meter and computed dioptometer.· RESULTS： There was no significant difference in corneal refractive power among preoperative and post operative 1, 3 and 6mo（0.57±0.54 D at pre-surgery; 0.72±0.26 D at 1mo; 0.71 ±0.34 D at 3mo; 0.69 ±0.31 D at 6mo;all P 〉0.05）. Axial lengths were obviously lengthened,especially in vitreous cavity length（17.87 ±3.09 mm,19.69 ±3.12 mm, 18.97 ±3.56 mm, 18.76 ±3.47 mm, 18.68 ±3.42 mm at pre-surgery, 1wk, 1, 3 and 6mo postoperatively,P 〈0.05） and diopter also increased at beginning and then recovered gradually. After 1 and 3 mo, axial length（vitreous cavity length） and myopia were more and in higher degree than before surgery.·CONCLUSION： The change of postoperative vitreous cavity length is the main factor that results in the changes of axial length and then makes the change of diopter.展开更多
基金National Natural Science Foundation of China(Grant Nos.61803348,62173312,51922009)Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement(Grant No.201905D121001).
文摘Most researches associated with target encircling control are focused on moving along a circular orbit under an ideal environment free from external disturbances.However,elliptical encirclement with a time-varying observation radius,may permit a more flexible and high-efficacy enclosing solution,whilst the non-orthogonal property between axial and tangential speed components,non-ignorable environmental perturbations,and strict assignment requirements empower elliptical encircling control to be more challenging,and the relevant investigations are still open.Following this line,an appointed-time elliptical encircling control rule capable of reinforcing circumnavigation performances is developed to enable Unmanned Aerial Vehicles(UAVs)to move along a specified elliptical path within a predetermined reaching time.The remarkable merits of the designed strategy are that the relative distance controlling error can be guaranteed to evolve within specified regions with a designer-specified convergence behavior.Meanwhile,wind perturbations can be online counteracted based on an unknown system dynamics estimator(USDE)with only one regulating parameter and high computational efficiency.Lyapunov tool demonstrates that all involved error variables are ultimately limited,and simulations are implemented to confirm the usability of the suggested control algorithm.
文摘The Russian Federation unilaterally invaded the Republic of Ukraine＇s Crimean Peninsula, then commenced to occupy more of Eastern Ukraine on the transparent pretext of protecting Russian speakers in 2014, using masked ＂zombie＂ fighters but denied that they were uniformed Russian soldiers, violating several agreements from 1954 to 1994 and legitimate international expectations before and afterwards. Elections were held, seriatim, one alter another, contrived supposedly to reflect the wishes of ethnic Russians in cities along Ukraine＇s eastern border, results of which triggered declarations by separatists of ＂independence＂ followed by formation of ＂people＇s republics＂ as city states. What this signifies is a clash of cultural expectations： of core values, both in the hearts and minds of all parties involved, and in the methods chosen by Russian Federation and Ukrainian independence movement leaders compared with Western governments. If Russia is revoking its transfer of the Crimea to Ukraine on an assertion that such transfer 60 years back was improvident then the Western Alliance should respond by revoking the Potsdam Declaration and other agreements investing Russia with control of Krnigsberg （renamed Kaliningrad） including the Treaty of Paris, and possibly revoking commitments made improvidently at the Teheran and Yalta summit conferences, transferring what was Eastern Poland west of the Curzon Line to the Soviet Union and eventually to Ukraine. If the West will tolerate a Russian siege of Crimea, it should forthwith impose an Allied siege of Kaliningrad and occupy that oblast immediately, retuming Krnigsberg to sovereignty under Lithuanian or Polish and EU control with annexation as a NATO base. What the West with NATO must do is to fight encirclement with encirclement including military, information, economic, trade encirclement as part of what is termed ＂hybrid warfare＂. Stopping military advancement eastward into Europe is only one prong of the problem. Another is Greece, a country that has formed the foundation of the defense of Europe to its own economic detriment. Ukraine as a hot spot is the consequence of China＇s ambition to partner with Ukraine in construction of a post-Panamax deep water cargo port on the Crimean peninsula, prompting Russian Federation opposition （Chinese Billionaire, 2013）. This paper proposes that China transfer its deep water port to Greece fund it through a new East Europe Infrastructure Investment Bank （EEIIB）, achieve the same USD Trillion annual trade influx into the European Union, relieve Greece＇s agony without austerity by inaugurating a Chinese ＂Marshall Plan＂ to become the ＂Chen Yi Plan＂, relieve Greece＇s economic agony without imposing austerity by relocating China＇s planned deep water post-Panamax mega-port from Yevpatoria in Crimean Peninsula to a suitable Greek port, thereby making Greece sustainably rich much as the Marshall Plan did for post-war Germany.
基金This work was supported by the National ＂Natural Science Foundation of China （61304155, 11371049）, and the Beijing Municipal Government Foundation for Talents （2012D005003000005）.
文摘As mankind was one kind of aesthetic species,the visual study of Marxist philosophy has profound enlightenment in understanding the New Year paintings' visual meaning,form,development,cultivation,and features etc.In essence,Chinese folk New Year paintings is a visual expression,its nature of being pasted at home makes it a visual encirclement for the Chinese people,this vision encirclement in the home space gradually expands,constitutes a spiritual home with different cultural space,living environment,image schema,and secular and religious faith scope,in this visual encirclement,people's home life achieves the satisfaction,peace and self–comfort in diversity.The"childrenization"of New Year paintings reveals a close relationship between the immature of folk art and the original art as human childhood,and from the both aspects of form and content reflects the visual encirclement is actually a kind of siege with cultural significance,this siege has multiple levels in value ideas,historical tradition,ethical order and life knowledge,aesthetic taste and so on,makes us have a new aesthetic anthropology on the New Year paintings.
基金supported by the International Scientific and Technological Cooperation Program of China (no.2009DFA31230)the Industry-University-Research Cooperation Program from Science and Technology Department of Guangdong Province (no. 2010B090400533)
文摘An efficient method for the isolation and purification of 12,13-dihydroxyeuparin from Radix Eupatorii Chinensis by high speed counter-current chromatography (HSCCC) was established in this paper. The ether extracts of Radix Eupatorii Chinensis were purified by HSCCC with a solvent system of hexyl hydride-ethyl acetate-methanol-water (1:2:1:2, v/v/v/v). The upper phase was used as the stationary phase and the lower phase as the mobile phase. About 8.4 mg of 12, 13-dihydroxyeuparin was obtained from 200 mg of ether extracts from Radix Eupatorii Chinensis in one-step HSCCC separation, with the purity of 96.71%, as determined by HPLC. After methanol- water recrystallization, the purity of 12,13-dihydroxyeuparin reached 99.83%. Such a simple and effective method was fairly useful to prepare pure compound as reference substances for related study on Radix Eupatorii Chinensis.
文摘AIM: To evaluate the effect of scleral encircling bands on the development and progression of diabetic retinopathy(DR) in diabetic patients.METHODS: The medical records of diabetic patients who underwent unilateral retinal detachment(RD) surgery using scleral buckle and encircling band were reviewed retrospectively. Both eyes of patients were included in the study: one eye in each patient had a scleral buckle with encircling band(the operated eye) and the other one is the non-operated eye. The demographic characters, duration of diabetes and period between surgery and the last recall visit were retrieved from each patient. All the cases underwent fundus photo and fluorescein angiography(when indicated) to confirm the DR staging.RESULTS: Totally 25 patients fulfilled the inclusion and the exclusion criteria were become eligible for the study. A total of 50 eyes of 25 patients were enrolled in this analysis. The mean period of time passed from surgery with encircling band and the last reassessment visit was 12.5±2 y. Even though DR could develop in the operated eyes, it was at a less degree of severity compared to the non-operated eyes of same patients(P=0.027).CONCLUSION: Scleral encircling bands have protective effects against the development and progression of DR.
文摘Chronic venous incompetence of the lower extramities is a common disease whose etilogy and surgical treatment has been proposed by several authors. Histner (1975) discribed primary valvular incompetency and the effect of valvuloplasty. By the usage of phlebographe, we found that the cause of valvular incompetence was the dilatation of venous lumen, which made the valve relatively smaller. The function of valve may be restored by the circular suture of femoral vein wall below the first valve so as to reduce the dilated venous lumen. during the period from 1984 to 1994, 151 cases have been treated by this new technique. This report presents our experience in using encircling constricting suture method of the femoral venous wall.
基金Supported by the Natural Science Foundation of Anhui Province(No.1508085MH188)Science Foundation of Anhui Provincial health Bureau(No.13zc046)
文摘AIM： To observe the changes of vitreous cavity length and diopter after scleral encircling（SE） produce.·METHODS： This prospective study included 68 eyes of68 non-consecutive patients with macula-off retinal detachment who were operated by SE surgery. The corneal refractive power, ocular axial length and diopter were measured by keratometer, A-mode ultrasonic meter and computed dioptometer.· RESULTS： There was no significant difference in corneal refractive power among preoperative and post operative 1, 3 and 6mo（0.57±0.54 D at pre-surgery; 0.72±0.26 D at 1mo; 0.71 ±0.34 D at 3mo; 0.69 ±0.31 D at 6mo;all P 〉0.05）. Axial lengths were obviously lengthened,especially in vitreous cavity length（17.87 ±3.09 mm,19.69 ±3.12 mm, 18.97 ±3.56 mm, 18.76 ±3.47 mm, 18.68 ±3.42 mm at pre-surgery, 1wk, 1, 3 and 6mo postoperatively,P 〈0.05） and diopter also increased at beginning and then recovered gradually. After 1 and 3 mo, axial length（vitreous cavity length） and myopia were more and in higher degree than before surgery.·CONCLUSION： The change of postoperative vitreous cavity length is the main factor that results in the changes of axial length and then makes the change of diopter.
