Dan H . Azam - Academia.edu (original) (raw)

Papers by Dan H . Azam

The construction of economic corridors is a crucial way to promote the Belt and Road Initiative (... more The construction of economic corridors is a crucial way to promote the Belt and Road Initiative (BRI) and is also an essential strategy for China's neighborhood diplomacy and economic cooperation. In the context of COVID-19 pandemic, the high-quality development of Belt and Road Economic Corridors can be promoted at various levels, including language and culture, policies and regulations, economic structures, financial services and social environment. Meanwhile, fieldwork surveys and other means are conducted to map out a long-term vision of the future development. To promote the spread of China's soft power in the economic corridor regions, we need to grasp the direction of public sentiment and social reactions so as to find problem-solving solutions, strengthen interconnectivity cooperation and build a community of shared future for mankind.

Soft nanoscience letters, 2020

Nanotechnologies, nanoparticles and nanomaterials, which are part of everyday life today, are the... more Nanotechnologies, nanoparticles and nanomaterials, which are part of everyday life today, are the subject of intense research activities and a certain amount of media coverage. In this article, the concepts of nanotechnologies, nanoparticles and nanosciences are defined and the interest in this scale of the matter is explained by specifying in particular the particular properties of nanoobjects. Large-scale applications of nanoparticles, particularly in the field of chemicals, everyday life and catalysis are presented.

Applied Thermal Engineering, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Applied Mechanics and Materials, 2013

This paper describes a new navigational algorithm that combines Artificial Potential Fields with ... more This paper describes a new navigational algorithm that combines Artificial Potential Fields with PID controller to realize accurate channel survey, automatic obstacle avoiding, optimal route search et al. A set course can be obtained through this new algorithm and the steering of the unmanned survey ship will be worked out by closed-loop control. In test system, the location of the ship is obtained by GPS, and the error of electric steering gear angle controls PWM pulse signal, which drives servo motor by power amplifying device, thus making the electric steering gear to turn as expected. Communication between upper and lower computer is realized by C language and serial port communication, so as to get parameter information and track images of the ship in a real-time manner. The result shows that the new navigational algorithm more efficient and precise, and can be widely used in fairway surveying engineering.

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2017

IEEE Photonics Journal, 2022

Scattering media, such as biological tissues and turbid liquids, scatter light randomly and intro... more Scattering media, such as biological tissues and turbid liquids, scatter light randomly and introduce several challenges when imaging objects behind them. The transmission matrix (TM) describes the relation between the input and output of a beam transmitted through a medium, which can be used to reconstruct a target located behind a scattering medium. However, the current TM methods cannot easily retrieve the phase distribution of objects inside or behind a scattering medium. In this work, a compressive sensing (CS) method to identify the TM of a scatter contained in an imaging system was investigated. By calibrating the TM, the phase information of the object can be retrieved quantitatively. This method allows one to retrieve multilevel and dynamic phase objects behind different scatters. The influence of the calibration parameters on the reconstruction quality was investigated in detail. The proposed method, featuring noninterference measurements of the TM and exploiting a large field of view, can be used in phase imaging applications. Index Terms-Imaging through scattering media, phase retrieval, transmission matrix, compressive sensing. I. INTRODUCTION R ESEARCH on focusing and imaging through a scattering medium has recently triggered substantial interest [1]-[3] due to its important applications in biomedical imaging, fire rescue, micromanipulation, etc. [4]-[7]. Thus far, many

PLOS Neglected Tropical Diseases, 2012

<p>Three Gorges Dam and reservoir, distribution of <i>S. japonicum</i> and loca... more <p>Three Gorges Dam and reservoir, distribution of <i>S. japonicum</i> and location of study villages.</p

IEEE Photonics Technology Letters, 2019

The complementary beam subtraction (CBS) method can reduce the out-of-focus background and improv... more The complementary beam subtraction (CBS) method can reduce the out-of-focus background and improve the axial resolution in light-sheet fluorescence microscopy (LSFM) via double scanning a Bessel and the complementary beams. With the assistance of a compressed blind deconvolution and denoising (CBDD) algorithm, the noise and blurring incurred during CBS imaging can be further removed. However, this approach requires double scanning and large computational cost. Here, we propose a deep learning-based method for LSFM, which can reconstruct high-quality images directly from the conventional Bessel beam (BB) light-sheet via a single scan. The image quality achievable with this CBS-Deep method is competitive with or better than the CBS-CBDD method, while the speed of image reconstruction is about 100 times faster. Accordingly, the proposed method can significantly improve the practicality of the CBS-CBDD system by reducing both scanning behavior and reconstruction time. The results show that this cost-effective and convenient method enables high-quality LSFM techniques to be developed and applied.

Advanced Materials Research, 2013

Analysis of gas exchange and determination of chlorophyll fluorescence parameters in leaves of th... more Analysis of gas exchange and determination of chlorophyll fluorescence parameters in leaves of three tree species including Aesculus chinensis, A. octandra and A. hybrida were conducted under field conditions and then comparison was carried out. The results showed that the light compensation point (LCP) was significantly different among the three tree species, of which the LCP of A. chinensis with 12.53 μmol·m-2·s-1 that of the lowest was notable lower than that of the other two species (36.11 and 46.41 μmol·m-2·s-1respectively). On the other hand, the light saturation point (LSP) of the three tree species also showed remarked different and the LSP of A. chinensis was 1475 μmol·m-2·s-1 which was dramatic higher than that of the other two species respective to 1366.67 and 1025 μmol·m-2·s-1. Beside, the maximum net photosynthetic rate (MNPR) was different too, MNPR of A. chinensis was 9.47μmol CO 2·m-2·s-1which was higher than the other two species (5.91 and 2.30 μmol CO 2·m-2·s-1 res...

International journal of clinical and experimental medicine, 2015

The main indications of Monti ileovesicostomy is urinary incontinence and urethral injury. Thus, ... more The main indications of Monti ileovesicostomy is urinary incontinence and urethral injury. Thus, it's very significant for the patients to relieve the vice effects of Moni ileovesicostomy. The aim of this study is to investigate the perioperative nursing care and methods to improve the quality of life in Monti ileovesicostomy. In this study, 5 patients received Monti ileovesicostomy in our department since 2009, each patient was provided with well-designed perioperative nursing care including physical and psychological nursing, care of complications, health education, family rehabilitation guidance, and the quality of life for each patient was followed up after the operation. The results indicated that all of 5 patients recovered successfully Without bloating, vomiting, and severe bleeding; In one year follow-up, 5 patients didn't suffer colostomy narrowing, blockage or dermatitis; 5…

6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems, 2012

ABSTRACT In optical trapping, annular beam as a kind of hollow beam is used to increase the axial... more ABSTRACT In optical trapping, annular beam as a kind of hollow beam is used to increase the axial trapping efficiency as well as the trapping stability. In this paper, a method for producing an annular beam by a system consisting of a single axicon and a pair of lens is proposed. The generated beam was also used as the optical tweezers. We use the geometrical optics to describe the propagation of light in the system. The calculated intensity distribution in three-dimensional space after the system shows a good agreement with the experimental results. The advantages of this method are simplicity of operation, good stability, and high transmittance, having possible applications in fields like optical microscopic, optical manipulation and electronic acceleration, etc.

Physics Letters A, 2015

ABSTRACT We present a set of beams which combine the properties of accelerating beams and (conven... more ABSTRACT We present a set of beams which combine the properties of accelerating beams and (conventional) diffraction-free beams. These beams can travel along a desired trajectory while keeping an approximately invariant transverse profile, which may be (higher-order) Bessel-, Mathieu- or parabolic-nondiffracting-like beams, depending on the initial complex amplitude distribution. A possible application of these beams presented here may be found in optical trapping field. For example, a higher-order Bessel-like beam, which has a hollow (transverse) pattern, is suitable for guiding low-refractive-index or metal particles along a curve.

Advanced Materials Research, 2012

Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the ... more Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the corrosion resistance of magnesium alloy. The oxide films were hydrothermally heated at 150°C for 2h. The morphology of samples were characterized by SEM/EDS. The phase compositions were examined by TF-XRD. The corrosion resistance of the coatings was evaluated by electrochemical methods in Hank’s solution. The MAO films displayed porous and rough structure and were mainly composed of MgO and MgAl2O4. After hydrothermal treatment, a dicalcium phosphate dihydrate (DCPD) coating formed on the oxide film. The corrosion resistance of the MAO film and DCPD coating was increased by about 12 and 40 times higher than that of bare magnesium alloy.

1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96

... Yannis Tsividis Dandan Li Department of Electrical Engineering, Columbia University, New York... more ... Yannis Tsividis Dandan Li Department of Electrical Engineering, Columbia University, New York, NY 10027 ... As was discussed in 141, however, for such implementations linearity is only achieved approximately and only under certain conditions, due to the fact that the filter ...

Journal of Optics, 2014

ABSTRACT A phase retrieval method by using single-shot dual-wavelength digital holography is prop... more ABSTRACT A phase retrieval method by using single-shot dual-wavelength digital holography is proposed. Each single wavelength hologram is extracted from the color CCD recorded hologram at one exposure, and the unwrapped phase image of object can be reconstructed directly. Different from the traditional multiple wavelength phase unwrapping techniques, any single complex wave-fronts at different wavelengths have no need to be calculated any more. Thus, the phase retrieval is computationally fast and straightforward, and the limitations on the total optical path difference are significantly relaxed. The practicability of the proposed method is demonstrated by both simulated and experimental results.

Applied Mechanics and Materials, 2014

For quadrotor unmanned air vehicles (UAVs) nonlinear control problems under disturbance condition... more For quadrotor unmanned air vehicles (UAVs) nonlinear control problems under disturbance conditions, a nested loop control approach is presented to realize robust control. The robust control approach is proposed to solve the stabilization and navigation problems in the quadrotor. The robust control strategy is composed of two controllers. A nonlinear backstepping controller is designed for the inner loop to stabilize the attitude angle. A PID controller based on BP neural network is designed for the outer loop in order to generate the reference path for the inner loop. Numerous simulations and flight test experiments have been made to study the performance of controller based on the independently developed quadrotor UAV. The results illustrate that the proposed controller has good stability, maneuverability and robustness.

Advanced Materials Research, 2013

Aspect-Oriented Software Architecture (AOA) is a high-level abstraction and integration blueprint... more Aspect-Oriented Software Architecture (AOA) is a high-level abstraction and integration blueprint of aspectual component-based software. A semantic model of aspectual component-based software is proposed to provide behavior description and semantic foundation for the consistency verification of software architecture dynamic evolution. By using the semantic model of Pi-calculus, a set of the consistency verification methods of dynamic evolution from multiple aspects are introduced. Finally, a case study shows the effect of these methods.

Advanced Materials Research, 2013

With the popularity of plastic mulching technology, the residual agricultural mulch bring more an... more With the popularity of plastic mulching technology, the residual agricultural mulch bring more and more negative effect. They destroy the soil structure and harm crops, so effect the agricultural environment. By means of pot and field experiment for rice growth periods, this paper study the content of DBP and DEHP, Pb and Cd in the plants are differences in different film residues at 850 farm in Heilongjiang. Experimental results show that people detect DBP content in plant rice, but DEHP composition has not been detected. Rice seedling DBP content was lower than harvest stem DBP content was lower than grain content. Rice seedlings to Pb and Cd content ripe grains in plants are within the normal concentration; its content requirements are still in the plant growth referral levels. The use of plastic-film mulch is uneconomic under existing plastic film collecting technology in the long run. And come up with study direction in the future.

Photonics Research, 2014

ABSTRACT When structured illumination is used in digital holographic microscopy (DHM), each direc... more ABSTRACT When structured illumination is used in digital holographic microscopy (DHM), each direction of the illumination fringe is required to be shifted at least three times to perform the phase-shifting reconstruction. In this paper, we propose a scheme for spatial resolution enhancement of DHM by using the structured illumination but without phase shifting. The structured illuminations of different directions, which are generated by a spatial light modulator, illuminate the sample sequentially in the object plane. The formed object waves interfere with a reference wave in an off-axis configuration, and a CCD camera records the generated hologram. After the object waves are reconstructed numerically, a synthetic aperture is performed by an iterative algorithm to enhance the spatial resolution. The resolution improvement of the proposed method is proved and demonstrated by both simulation and experiment.

The construction of economic corridors is a crucial way to promote the Belt and Road Initiative (... more The construction of economic corridors is a crucial way to promote the Belt and Road Initiative (BRI) and is also an essential strategy for China's neighborhood diplomacy and economic cooperation. In the context of COVID-19 pandemic, the high-quality development of Belt and Road Economic Corridors can be promoted at various levels, including language and culture, policies and regulations, economic structures, financial services and social environment. Meanwhile, fieldwork surveys and other means are conducted to map out a long-term vision of the future development. To promote the spread of China's soft power in the economic corridor regions, we need to grasp the direction of public sentiment and social reactions so as to find problem-solving solutions, strengthen interconnectivity cooperation and build a community of shared future for mankind.

Soft nanoscience letters, 2020

Nanotechnologies, nanoparticles and nanomaterials, which are part of everyday life today, are the... more Nanotechnologies, nanoparticles and nanomaterials, which are part of everyday life today, are the subject of intense research activities and a certain amount of media coverage. In this article, the concepts of nanotechnologies, nanoparticles and nanosciences are defined and the interest in this scale of the matter is explained by specifying in particular the particular properties of nanoobjects. Large-scale applications of nanoparticles, particularly in the field of chemicals, everyday life and catalysis are presented.

Applied Thermal Engineering, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Applied Mechanics and Materials, 2013

This paper describes a new navigational algorithm that combines Artificial Potential Fields with ... more This paper describes a new navigational algorithm that combines Artificial Potential Fields with PID controller to realize accurate channel survey, automatic obstacle avoiding, optimal route search et al. A set course can be obtained through this new algorithm and the steering of the unmanned survey ship will be worked out by closed-loop control. In test system, the location of the ship is obtained by GPS, and the error of electric steering gear angle controls PWM pulse signal, which drives servo motor by power amplifying device, thus making the electric steering gear to turn as expected. Communication between upper and lower computer is realized by C language and serial port communication, so as to get parameter information and track images of the ship in a real-time manner. The result shows that the new navigational algorithm more efficient and precise, and can be widely used in fairway surveying engineering.

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2017

IEEE Photonics Journal, 2022

Scattering media, such as biological tissues and turbid liquids, scatter light randomly and intro... more Scattering media, such as biological tissues and turbid liquids, scatter light randomly and introduce several challenges when imaging objects behind them. The transmission matrix (TM) describes the relation between the input and output of a beam transmitted through a medium, which can be used to reconstruct a target located behind a scattering medium. However, the current TM methods cannot easily retrieve the phase distribution of objects inside or behind a scattering medium. In this work, a compressive sensing (CS) method to identify the TM of a scatter contained in an imaging system was investigated. By calibrating the TM, the phase information of the object can be retrieved quantitatively. This method allows one to retrieve multilevel and dynamic phase objects behind different scatters. The influence of the calibration parameters on the reconstruction quality was investigated in detail. The proposed method, featuring noninterference measurements of the TM and exploiting a large field of view, can be used in phase imaging applications. Index Terms-Imaging through scattering media, phase retrieval, transmission matrix, compressive sensing. I. INTRODUCTION R ESEARCH on focusing and imaging through a scattering medium has recently triggered substantial interest [1]-[3] due to its important applications in biomedical imaging, fire rescue, micromanipulation, etc. [4]-[7]. Thus far, many

PLOS Neglected Tropical Diseases, 2012

<p>Three Gorges Dam and reservoir, distribution of <i>S. japonicum</i> and loca... more <p>Three Gorges Dam and reservoir, distribution of <i>S. japonicum</i> and location of study villages.</p

IEEE Photonics Technology Letters, 2019

The complementary beam subtraction (CBS) method can reduce the out-of-focus background and improv... more The complementary beam subtraction (CBS) method can reduce the out-of-focus background and improve the axial resolution in light-sheet fluorescence microscopy (LSFM) via double scanning a Bessel and the complementary beams. With the assistance of a compressed blind deconvolution and denoising (CBDD) algorithm, the noise and blurring incurred during CBS imaging can be further removed. However, this approach requires double scanning and large computational cost. Here, we propose a deep learning-based method for LSFM, which can reconstruct high-quality images directly from the conventional Bessel beam (BB) light-sheet via a single scan. The image quality achievable with this CBS-Deep method is competitive with or better than the CBS-CBDD method, while the speed of image reconstruction is about 100 times faster. Accordingly, the proposed method can significantly improve the practicality of the CBS-CBDD system by reducing both scanning behavior and reconstruction time. The results show that this cost-effective and convenient method enables high-quality LSFM techniques to be developed and applied.

Advanced Materials Research, 2013

Analysis of gas exchange and determination of chlorophyll fluorescence parameters in leaves of th... more Analysis of gas exchange and determination of chlorophyll fluorescence parameters in leaves of three tree species including Aesculus chinensis, A. octandra and A. hybrida were conducted under field conditions and then comparison was carried out. The results showed that the light compensation point (LCP) was significantly different among the three tree species, of which the LCP of A. chinensis with 12.53 μmol·m-2·s-1 that of the lowest was notable lower than that of the other two species (36.11 and 46.41 μmol·m-2·s-1respectively). On the other hand, the light saturation point (LSP) of the three tree species also showed remarked different and the LSP of A. chinensis was 1475 μmol·m-2·s-1 which was dramatic higher than that of the other two species respective to 1366.67 and 1025 μmol·m-2·s-1. Beside, the maximum net photosynthetic rate (MNPR) was different too, MNPR of A. chinensis was 9.47μmol CO 2·m-2·s-1which was higher than the other two species (5.91 and 2.30 μmol CO 2·m-2·s-1 res...

International journal of clinical and experimental medicine, 2015

The main indications of Monti ileovesicostomy is urinary incontinence and urethral injury. Thus, ... more The main indications of Monti ileovesicostomy is urinary incontinence and urethral injury. Thus, it's very significant for the patients to relieve the vice effects of Moni ileovesicostomy. The aim of this study is to investigate the perioperative nursing care and methods to improve the quality of life in Monti ileovesicostomy. In this study, 5 patients received Monti ileovesicostomy in our department since 2009, each patient was provided with well-designed perioperative nursing care including physical and psychological nursing, care of complications, health education, family rehabilitation guidance, and the quality of life for each patient was followed up after the operation. The results indicated that all of 5 patients recovered successfully Without bloating, vomiting, and severe bleeding; In one year follow-up, 5 patients didn't suffer colostomy narrowing, blockage or dermatitis; 5…

6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems, 2012

ABSTRACT In optical trapping, annular beam as a kind of hollow beam is used to increase the axial... more ABSTRACT In optical trapping, annular beam as a kind of hollow beam is used to increase the axial trapping efficiency as well as the trapping stability. In this paper, a method for producing an annular beam by a system consisting of a single axicon and a pair of lens is proposed. The generated beam was also used as the optical tweezers. We use the geometrical optics to describe the propagation of light in the system. The calculated intensity distribution in three-dimensional space after the system shows a good agreement with the experimental results. The advantages of this method are simplicity of operation, good stability, and high transmittance, having possible applications in fields like optical microscopic, optical manipulation and electronic acceleration, etc.

Physics Letters A, 2015

ABSTRACT We present a set of beams which combine the properties of accelerating beams and (conven... more ABSTRACT We present a set of beams which combine the properties of accelerating beams and (conventional) diffraction-free beams. These beams can travel along a desired trajectory while keeping an approximately invariant transverse profile, which may be (higher-order) Bessel-, Mathieu- or parabolic-nondiffracting-like beams, depending on the initial complex amplitude distribution. A possible application of these beams presented here may be found in optical trapping field. For example, a higher-order Bessel-like beam, which has a hollow (transverse) pattern, is suitable for guiding low-refractive-index or metal particles along a curve.

Advanced Materials Research, 2012

Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the ... more Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the corrosion resistance of magnesium alloy. The oxide films were hydrothermally heated at 150°C for 2h. The morphology of samples were characterized by SEM/EDS. The phase compositions were examined by TF-XRD. The corrosion resistance of the coatings was evaluated by electrochemical methods in Hank’s solution. The MAO films displayed porous and rough structure and were mainly composed of MgO and MgAl2O4. After hydrothermal treatment, a dicalcium phosphate dihydrate (DCPD) coating formed on the oxide film. The corrosion resistance of the MAO film and DCPD coating was increased by about 12 and 40 times higher than that of bare magnesium alloy.

1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96

... Yannis Tsividis Dandan Li Department of Electrical Engineering, Columbia University, New York... more ... Yannis Tsividis Dandan Li Department of Electrical Engineering, Columbia University, New York, NY 10027 ... As was discussed in 141, however, for such implementations linearity is only achieved approximately and only under certain conditions, due to the fact that the filter ...

Journal of Optics, 2014

ABSTRACT A phase retrieval method by using single-shot dual-wavelength digital holography is prop... more ABSTRACT A phase retrieval method by using single-shot dual-wavelength digital holography is proposed. Each single wavelength hologram is extracted from the color CCD recorded hologram at one exposure, and the unwrapped phase image of object can be reconstructed directly. Different from the traditional multiple wavelength phase unwrapping techniques, any single complex wave-fronts at different wavelengths have no need to be calculated any more. Thus, the phase retrieval is computationally fast and straightforward, and the limitations on the total optical path difference are significantly relaxed. The practicability of the proposed method is demonstrated by both simulated and experimental results.

Applied Mechanics and Materials, 2014

For quadrotor unmanned air vehicles (UAVs) nonlinear control problems under disturbance condition... more For quadrotor unmanned air vehicles (UAVs) nonlinear control problems under disturbance conditions, a nested loop control approach is presented to realize robust control. The robust control approach is proposed to solve the stabilization and navigation problems in the quadrotor. The robust control strategy is composed of two controllers. A nonlinear backstepping controller is designed for the inner loop to stabilize the attitude angle. A PID controller based on BP neural network is designed for the outer loop in order to generate the reference path for the inner loop. Numerous simulations and flight test experiments have been made to study the performance of controller based on the independently developed quadrotor UAV. The results illustrate that the proposed controller has good stability, maneuverability and robustness.

Advanced Materials Research, 2013

Aspect-Oriented Software Architecture (AOA) is a high-level abstraction and integration blueprint... more Aspect-Oriented Software Architecture (AOA) is a high-level abstraction and integration blueprint of aspectual component-based software. A semantic model of aspectual component-based software is proposed to provide behavior description and semantic foundation for the consistency verification of software architecture dynamic evolution. By using the semantic model of Pi-calculus, a set of the consistency verification methods of dynamic evolution from multiple aspects are introduced. Finally, a case study shows the effect of these methods.

Advanced Materials Research, 2013

With the popularity of plastic mulching technology, the residual agricultural mulch bring more an... more With the popularity of plastic mulching technology, the residual agricultural mulch bring more and more negative effect. They destroy the soil structure and harm crops, so effect the agricultural environment. By means of pot and field experiment for rice growth periods, this paper study the content of DBP and DEHP, Pb and Cd in the plants are differences in different film residues at 850 farm in Heilongjiang. Experimental results show that people detect DBP content in plant rice, but DEHP composition has not been detected. Rice seedling DBP content was lower than harvest stem DBP content was lower than grain content. Rice seedlings to Pb and Cd content ripe grains in plants are within the normal concentration; its content requirements are still in the plant growth referral levels. The use of plastic-film mulch is uneconomic under existing plastic film collecting technology in the long run. And come up with study direction in the future.

Photonics Research, 2014

ABSTRACT When structured illumination is used in digital holographic microscopy (DHM), each direc... more ABSTRACT When structured illumination is used in digital holographic microscopy (DHM), each direction of the illumination fringe is required to be shifted at least three times to perform the phase-shifting reconstruction. In this paper, we propose a scheme for spatial resolution enhancement of DHM by using the structured illumination but without phase shifting. The structured illuminations of different directions, which are generated by a spatial light modulator, illuminate the sample sequentially in the object plane. The formed object waves interfere with a reference wave in an off-axis configuration, and a CCD camera records the generated hologram. After the object waves are reconstructed numerically, a synthetic aperture is performed by an iterative algorithm to enhance the spatial resolution. The resolution improvement of the proposed method is proved and demonstrated by both simulation and experiment.