In this paper,we consider 3 D tomographic reconstruction for axially symmetric objects from a single radiograph formed by cone-beam X-rays.All contemporary density reconstruction methods in high-energy X-ray radiograp...In this paper,we consider 3 D tomographic reconstruction for axially symmetric objects from a single radiograph formed by cone-beam X-rays.All contemporary density reconstruction methods in high-energy X-ray radiography are based on the assumption that the cone beam can be treated as fan beams located at parallel planes perpendicular to the symmetric axis,so that the density of the whole object can be recovered layer by layer.Considering the relationship between different layers,we undertake the cone-beam global reconstruction to solve the ambiguity effect at the material interfaces of the reconstruction results.In view of the anisotropy of classical discrete total variations,a new discretization of total variation which yields sharp edges and has better isotropy is introduced in our reconstruction model.Furthermore,considering that the object density consists of continually changing parts and jumps,a high-order regularization term is introduced.The final hybrid regularization model is solved using the alternating proximal gradient method,which was recently applied in image processing.Density reconstruction results are presented for simulated radiographs,which shows that the proposed method has led to an improvement in terms of the preservation of edge location.展开更多
Diagnosis of fluids is extremely significant at high temperatures and high pressures.As an advanced imaging technique,high-energy proton radiography has great potential for application to the diagnosis of high-density...Diagnosis of fluids is extremely significant at high temperatures and high pressures.As an advanced imaging technique,high-energy proton radiography has great potential for application to the diagnosis of high-density fluids.In high-energy proton radiography,an angular collimator can control the proton flux and thus enable material diagnosis and reconstruction of density.In this paper,we propose a multimaterial diagnostic method using angular collimators.The method is verified by reconstructing the density distribution from the proton flux obtained via theoretical calculations and numerical simulations.We simulate a 20 GeV proton imaging system using the Geant4 software toolkit and obtain the characteristic parameters of single-material objects.We design several concentric spherical objects to verify the method.We discuss its application to detonation tests.The results show that this method can determine the material and boundary information about each component of a multi-material object.Thus,it can be used to diagnose a mixed material and reconstruct densities in a detonation.展开更多
Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutri...Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutritional value of corn remain unclear,as does the impact of this corn on piglet feeding.These experiments explored the effect of DON contamination and EBI treatment on the nutritional value of corn and the feeding effects of this corn on piglets.In Exp.1,40 piglets(initial weight:14.88±1.92 kg)were allotted to five experimental diets with eight replicates per diet.Five diets included four types of corn diets:normal corn(NC),DON-contaminated corn(DON-C),EBI-treated NC(EBI-NC),and EBI-treated DON-C(EBI-DON-C),and a nitrogen-free diet formulated to determine the basal endogenous loss of amino acids.In Exp.2,56 piglets(initial weight:7.58±0.35 kg)were randomly allocated to treatments arranged in a 2×2 factorial arrangement,with two types of corn(NC vs.DON-C)and two corn treatments(without EBI vs.EBI).There were four diets and seven replicate pens per diet,with two pigs per pen.The study found that both DON contamination and EBI treatment decreased the effective energy value of corn(P<0.05),and EBI treatment also decreased the standardized ileal digestibility(SID)of most amino acids(P<0.05),whereas DON contamination had no negative effect on the SID of amino acids(Exp.1).In Exp.2,EBI-treated corn(EBI-C)increased the average daily gain(P=0.001)and average daily feed intake(P<0.001),while increased feed conversion ratio(FCR)(P<0.001)and decreased nutrient digestibility(P<0.05).DON-C had a positive impact on FCR(P=0.005).Neither EBI-C nor DON-C affected serum biochemical parameters(P>0.05).However,DON-C may induce oxidative stress,impair immune function,and disrupt intestinal barrier.In conclusion,EBI reduced the DON content of DON-C,while impacted the nutritional value of corn.Furthermore,DON-C reduced the antioxidant capacity and immune function of piglets to some extent,although it did not affect their growth performance.展开更多
基金supported by National Postdoctoral Program for Innovative Talents(BX201700038)supported by NSFC(11571003)+1 种基金supported by NSFC(11675021)supported by Beijing Natural Science Foundation(Z180002)。
文摘In this paper,we consider 3 D tomographic reconstruction for axially symmetric objects from a single radiograph formed by cone-beam X-rays.All contemporary density reconstruction methods in high-energy X-ray radiography are based on the assumption that the cone beam can be treated as fan beams located at parallel planes perpendicular to the symmetric axis,so that the density of the whole object can be recovered layer by layer.Considering the relationship between different layers,we undertake the cone-beam global reconstruction to solve the ambiguity effect at the material interfaces of the reconstruction results.In view of the anisotropy of classical discrete total variations,a new discretization of total variation which yields sharp edges and has better isotropy is introduced in our reconstruction model.Furthermore,considering that the object density consists of continually changing parts and jumps,a high-order regularization term is introduced.The final hybrid regularization model is solved using the alternating proximal gradient method,which was recently applied in image processing.Density reconstruction results are presented for simulated radiographs,which shows that the proposed method has led to an improvement in terms of the preservation of edge location.
基金supported by the National Natural Science Foundation of China(Grant No.11675021)the Youth Fund Project of Zhejiang Lab(Grant No.K2023MG0AA08).
文摘Diagnosis of fluids is extremely significant at high temperatures and high pressures.As an advanced imaging technique,high-energy proton radiography has great potential for application to the diagnosis of high-density fluids.In high-energy proton radiography,an angular collimator can control the proton flux and thus enable material diagnosis and reconstruction of density.In this paper,we propose a multimaterial diagnostic method using angular collimators.The method is verified by reconstructing the density distribution from the proton flux obtained via theoretical calculations and numerical simulations.We simulate a 20 GeV proton imaging system using the Geant4 software toolkit and obtain the characteristic parameters of single-material objects.We design several concentric spherical objects to verify the method.We discuss its application to detonation tests.The results show that this method can determine the material and boundary information about each component of a multi-material object.Thus,it can be used to diagnose a mixed material and reconstruct densities in a detonation.
基金supported by Sichuan Province Major Science and Technology Special Projects(2021ZDZX0009)the Sichuan Pig Innovation Team of National Modern Agricultural Industry Technology System of China(scsztd-2024-08-11).
文摘Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutritional value of corn remain unclear,as does the impact of this corn on piglet feeding.These experiments explored the effect of DON contamination and EBI treatment on the nutritional value of corn and the feeding effects of this corn on piglets.In Exp.1,40 piglets(initial weight:14.88±1.92 kg)were allotted to five experimental diets with eight replicates per diet.Five diets included four types of corn diets:normal corn(NC),DON-contaminated corn(DON-C),EBI-treated NC(EBI-NC),and EBI-treated DON-C(EBI-DON-C),and a nitrogen-free diet formulated to determine the basal endogenous loss of amino acids.In Exp.2,56 piglets(initial weight:7.58±0.35 kg)were randomly allocated to treatments arranged in a 2×2 factorial arrangement,with two types of corn(NC vs.DON-C)and two corn treatments(without EBI vs.EBI).There were four diets and seven replicate pens per diet,with two pigs per pen.The study found that both DON contamination and EBI treatment decreased the effective energy value of corn(P<0.05),and EBI treatment also decreased the standardized ileal digestibility(SID)of most amino acids(P<0.05),whereas DON contamination had no negative effect on the SID of amino acids(Exp.1).In Exp.2,EBI-treated corn(EBI-C)increased the average daily gain(P=0.001)and average daily feed intake(P<0.001),while increased feed conversion ratio(FCR)(P<0.001)and decreased nutrient digestibility(P<0.05).DON-C had a positive impact on FCR(P=0.005).Neither EBI-C nor DON-C affected serum biochemical parameters(P>0.05).However,DON-C may induce oxidative stress,impair immune function,and disrupt intestinal barrier.In conclusion,EBI reduced the DON content of DON-C,while impacted the nutritional value of corn.Furthermore,DON-C reduced the antioxidant capacity and immune function of piglets to some extent,although it did not affect their growth performance.
