A design of low-light-level night vision system is described,which can image objects selectively in the specific space. The system can selectively image some objects in specific distances,meanwhile ignore those shelte...A design of low-light-level night vision system is described,which can image objects selectively in the specific space. The system can selectively image some objects in specific distances,meanwhile ignore those shelters on the way of observation by combining an intensifying charge coupled device(ICCD) with a near infrared laser assisted in vision,whose operation wavelength matches with the photocathode of the image tube,and adopting the gated mode and adjustable time-delay. A semiconductor laser diode of 100 W in peak power is chosen for illumination. The laser and the image tube operate in 150 ns pulse width and 2 kHz repeat frequency. Some images of different objects at the different distances within 100 m can be obtained clearly,and even behind a grove by using a sampling circuit and a delay control device at 100 W in peak power of semiconductor laser diode,150 ns in pulse width of laser and image tube,2 kHz in repeat frequency.展开更多
A new method of increasing the range measure preci- sion by Chirp- Z transform in the level Radar has been put up in this paper. The main assignment of this research is to accom- plish the FFT and Chirp- Z transform. ...A new method of increasing the range measure preci- sion by Chirp- Z transform in the level Radar has been put up in this paper. The main assignment of this research is to accom- plish the FFT and Chirp- Z transform. At the same time, the af- fection of the two range measure methods has been analyzed in this paper. This method can increase both the calculation effi- ciency and range measure precision remarkably by theory calcu- lating and digital emulation.展开更多
With the development of graphic processing unit(GPU)power,it is now possible to implement geometric correction and edge blending functions on a single computer.However,the processing resources consumed by the geometri...With the development of graphic processing unit(GPU)power,it is now possible to implement geometric correction and edge blending functions on a single computer.However,the processing resources consumed by the geometric correction and edge blending phases still burden the system and slow down the main application considerably.A new platform independent scheme is proposed,minimizing the negative influence on performance.In this scheme,parameters for geometric correction and edge blending are firstly defined in an interactive way and recorded as a 32-bit high dynamic range(HDR) image,which is then used by high level shading language(HLSL) codes embedded in the main application as a lookup table,greatly reducing the computational complexity and enhancing flexibility.展开更多
Based on the "Grayscales average distribution" method which equally distributes the input gray levels to output gray levels, three improved methods named: "Reduce the gray range expressed by the less si...Based on the "Grayscales average distribution" method which equally distributes the input gray levels to output gray levels, three improved methods named: "Reduce the gray range expressed by the less significant subfields", "Low levels preset" and "Modify the exponent of inverse-gamma function" are proposed in this paper. Using these methods, the inverse-gamma relation subfields code can be obtained easily which can improve the low level expressions of AC-PDP. And a program, "gray scales distribution validate program", which can enhance the expressions of the demanded gray levels range, is also proposed in this paper.展开更多
The Kunlunshan Mountain Ms8.1 earthquake, occurred in Nov.14, 2001, is the first event with magnitude more than 8 in the China earthquake monitoring history, specifically at the beginning of digital techniques in prec...The Kunlunshan Mountain Ms8.1 earthquake, occurred in Nov.14, 2001, is the first event with magnitude more than 8 in the China earthquake monitoring history, specifically at the beginning of digital techniques in precursor monitoring networks. Any investigation of recorded data on this earthquake is very important for testing the operation of the digital monitoring networks and understanding the preparation, occurrence, and adjustment of stress/strain of strong continental earthquakes. In this paper we investigated the coseismic response changes of well water level of groundwater and volume strain meter of bore hole in digital earthquake monitoring network of Capital area and its vicinity, due to the Nov.14, 2001 Ms8.1 Kunlun Mountain earthquake. The responding time, shapes or manners, amplitudes, and lasting time of well water level and strain-meters to seismic wave are studied in comparison. Then we discussed the possibility that the response changes of groundwater to strong distant earthquakes can be understood as one kind of observing evidence of stress/strain changes induced by distant earthquake.展开更多
Background In the context of China's aging population,meeting consumer demand is an essential way for nursing homes to fulfill social responsibilities and improve competitive advantages.However,since little is kno...Background In the context of China's aging population,meeting consumer demand is an essential way for nursing homes to fulfill social responsibilities and improve competitive advantages.However,since little is known about the elderly's service level and price choices for nursing home care,this study aims to explore the non-disabled elderly's nursing home admission intention,service level,and price choices.Methods A cross-sectional survey of 402 non-disabled respondents was conducted in three different income level cities of Zhejiang Province,in July and August 2018.Multinomial logistic regression and multiple linear regression were used to identify the determinants of admission intention,service level choice,and price choice.Results Education,residence,and number of children were significantly associated with nursing home admission intention.Compared to those with no intention,the elderly with higher income and household wealth were less likely to have conditional intentions,and those living with the family were less likely to have unconditional intentions.Compared to medium-level services,the elderly with higher monthly income(relative risk ratio[RRR]3.07,95%confidence interval[CI]:1.801 to 5.233),household wealth(RRR 5.451,95%CI:2.249 to 13.216),and age(RRR 1.528,95%CI:1.004 to 2.326)were more likely to prefer high-level services,while older adults with higher monthly income(RRR 0.516,95%CI:0.344 to 0.774),and those with pensions(RRR 0.267,95%CI:0.076 to 0.931)were less likely to prefer low-level services.The elderly's price preference increased by 398 CNY as monthly income increased by 1000 CNY,and by 270 CNY as the housing number increased by one.Having pensions increased price preference(468 CNY),whereas having health insurance decreased price preference(–690 CNY).Conclusion The elderly's intention of nursing home admission was primarily affected by sociodemographic factors,while price and service level choices were primarily affected by financial factors.Nursing homes should use the market segmentation method to provide precision nursing home care for different groups of non-disabled elderly.展开更多
On Aug.21,the 2024 Trans-Himalaya Cycling Race kicked off in Lhasa,the Xizang Autonomous Region.The five-day event,with three stages in Lhasa.Nyingchi,and Xigaze,covered a total distance of over 310 kilometers and ran...On Aug.21,the 2024 Trans-Himalaya Cycling Race kicked off in Lhasa,the Xizang Autonomous Region.The five-day event,with three stages in Lhasa.Nyingchi,and Xigaze,covered a total distance of over 310 kilometers and ranged from 2,988 to 4,034 meters above sea level.22 domestic and international teams with over 150 athletes participated in the race.展开更多
文摘A design of low-light-level night vision system is described,which can image objects selectively in the specific space. The system can selectively image some objects in specific distances,meanwhile ignore those shelters on the way of observation by combining an intensifying charge coupled device(ICCD) with a near infrared laser assisted in vision,whose operation wavelength matches with the photocathode of the image tube,and adopting the gated mode and adjustable time-delay. A semiconductor laser diode of 100 W in peak power is chosen for illumination. The laser and the image tube operate in 150 ns pulse width and 2 kHz repeat frequency. Some images of different objects at the different distances within 100 m can be obtained clearly,and even behind a grove by using a sampling circuit and a delay control device at 100 W in peak power of semiconductor laser diode,150 ns in pulse width of laser and image tube,2 kHz in repeat frequency.
文摘A new method of increasing the range measure preci- sion by Chirp- Z transform in the level Radar has been put up in this paper. The main assignment of this research is to accom- plish the FFT and Chirp- Z transform. At the same time, the af- fection of the two range measure methods has been analyzed in this paper. This method can increase both the calculation effi- ciency and range measure precision remarkably by theory calcu- lating and digital emulation.
文摘With the development of graphic processing unit(GPU)power,it is now possible to implement geometric correction and edge blending functions on a single computer.However,the processing resources consumed by the geometric correction and edge blending phases still burden the system and slow down the main application considerably.A new platform independent scheme is proposed,minimizing the negative influence on performance.In this scheme,parameters for geometric correction and edge blending are firstly defined in an interactive way and recorded as a 32-bit high dynamic range(HDR) image,which is then used by high level shading language(HLSL) codes embedded in the main application as a lookup table,greatly reducing the computational complexity and enhancing flexibility.
文摘Based on the "Grayscales average distribution" method which equally distributes the input gray levels to output gray levels, three improved methods named: "Reduce the gray range expressed by the less significant subfields", "Low levels preset" and "Modify the exponent of inverse-gamma function" are proposed in this paper. Using these methods, the inverse-gamma relation subfields code can be obtained easily which can improve the low level expressions of AC-PDP. And a program, "gray scales distribution validate program", which can enhance the expressions of the demanded gray levels range, is also proposed in this paper.
基金supported by Natural Science Foundation of China(41274061 and 40374019)
文摘The Kunlunshan Mountain Ms8.1 earthquake, occurred in Nov.14, 2001, is the first event with magnitude more than 8 in the China earthquake monitoring history, specifically at the beginning of digital techniques in precursor monitoring networks. Any investigation of recorded data on this earthquake is very important for testing the operation of the digital monitoring networks and understanding the preparation, occurrence, and adjustment of stress/strain of strong continental earthquakes. In this paper we investigated the coseismic response changes of well water level of groundwater and volume strain meter of bore hole in digital earthquake monitoring network of Capital area and its vicinity, due to the Nov.14, 2001 Ms8.1 Kunlun Mountain earthquake. The responding time, shapes or manners, amplitudes, and lasting time of well water level and strain-meters to seismic wave are studied in comparison. Then we discussed the possibility that the response changes of groundwater to strong distant earthquakes can be understood as one kind of observing evidence of stress/strain changes induced by distant earthquake.
基金This work was supported by the China Ministry of Education Project of Humanities and Social Sciences(Grant No.18YJC630100)the Project of Philosophy and Social Science of Hangzhou City of China(Grant No.2018JD50).
文摘Background In the context of China's aging population,meeting consumer demand is an essential way for nursing homes to fulfill social responsibilities and improve competitive advantages.However,since little is known about the elderly's service level and price choices for nursing home care,this study aims to explore the non-disabled elderly's nursing home admission intention,service level,and price choices.Methods A cross-sectional survey of 402 non-disabled respondents was conducted in three different income level cities of Zhejiang Province,in July and August 2018.Multinomial logistic regression and multiple linear regression were used to identify the determinants of admission intention,service level choice,and price choice.Results Education,residence,and number of children were significantly associated with nursing home admission intention.Compared to those with no intention,the elderly with higher income and household wealth were less likely to have conditional intentions,and those living with the family were less likely to have unconditional intentions.Compared to medium-level services,the elderly with higher monthly income(relative risk ratio[RRR]3.07,95%confidence interval[CI]:1.801 to 5.233),household wealth(RRR 5.451,95%CI:2.249 to 13.216),and age(RRR 1.528,95%CI:1.004 to 2.326)were more likely to prefer high-level services,while older adults with higher monthly income(RRR 0.516,95%CI:0.344 to 0.774),and those with pensions(RRR 0.267,95%CI:0.076 to 0.931)were less likely to prefer low-level services.The elderly's price preference increased by 398 CNY as monthly income increased by 1000 CNY,and by 270 CNY as the housing number increased by one.Having pensions increased price preference(468 CNY),whereas having health insurance decreased price preference(–690 CNY).Conclusion The elderly's intention of nursing home admission was primarily affected by sociodemographic factors,while price and service level choices were primarily affected by financial factors.Nursing homes should use the market segmentation method to provide precision nursing home care for different groups of non-disabled elderly.
文摘On Aug.21,the 2024 Trans-Himalaya Cycling Race kicked off in Lhasa,the Xizang Autonomous Region.The five-day event,with three stages in Lhasa.Nyingchi,and Xigaze,covered a total distance of over 310 kilometers and ranged from 2,988 to 4,034 meters above sea level.22 domestic and international teams with over 150 athletes participated in the race.
