根据单缸内燃机的工作原理 ,结合《热能与动力机械基础》多媒体教学软件的使用条件和特点 ,介绍了 3 D Studio MAX的三种建模方法和软件功能 ,阐述了利用 3 D StudioMAX创建内燃机三维模型和动态模拟过程 .开发过程打破了以专业开发工...根据单缸内燃机的工作原理 ,结合《热能与动力机械基础》多媒体教学软件的使用条件和特点 ,介绍了 3 D Studio MAX的三种建模方法和软件功能 ,阐述了利用 3 D StudioMAX创建内燃机三维模型和动态模拟过程 .开发过程打破了以专业开发工具开发内燃机模型的常规模式 ,尝试以通用软件开发内燃机三维动态模型 。展开更多
BACKGROUND Polyether ether ketone(PEEK)is a high-performance medical polymer,and there are some clinical cases of PEEK prosthesis implantation.However,application of 3D-printed injection-molded PEEK lunate prosthesis ...BACKGROUND Polyether ether ketone(PEEK)is a high-performance medical polymer,and there are some clinical cases of PEEK prosthesis implantation.However,application of 3D-printed injection-molded PEEK lunate prosthesis for treatment of stage Ⅲ Kienböck’s disease has not been reported.This study’s purpose was to analyze the clinical efficacy of 3D-printed injection-molded PEEK lunate prosthesis in the treatment of stage Ⅲ Kienböck’s disease and thus provide a good therapeutic choice for Kienböck’s disease.CASE SUMMARY We report a patient with stage Ⅲ Kienböck’s disease.With the healthy lunate bone as reference,3D lunate reconstruction was performed using a mirroring technique.A PEEK lunate prosthesis was prepared by 3D printing and injection molding,and then it was inserted into the original anatomical position after removing the necrotic lunate bone.Wrist pain and function,anatomical suitability of the lunate prosthesis,and complications were evaluated and analyzed postoperatively.At the last visit(one year after surgery),the range of motion,grasp force,visual analog scale score and Cooney score of the affected wrist were significantly improved,and postoperative X-ray examination indicated that the lunate prosthesis had good anatomical suitability for adjacent bony structures.CONCLUSION The 3D-printed injection-molded PEEK lunate prosthesis demonstrated definite efficacy in treating stage Ⅲ Kienböck’s disease.展开更多
We report the first case of single port laparoscopic right hemicolectomy for advanced colon cancer.An abdominal 3 cm length incision was made via the umbilicus.A small wound retractor and a surgical glove were used as...We report the first case of single port laparoscopic right hemicolectomy for advanced colon cancer.An abdominal 3 cm length incision was made via the umbilicus.A small wound retractor and a surgical glove were used as a single port.All soft tissue anterior to the superior mesenteric vein was completely removed and D3 lymph node dissection was achieved.The total operative time was 180 min with minimal blood loss (<50 mL).The size of the tumor was 5 cm×3 cm and its tumor stage was T3N0.Sixty-nine lymph nodes were harvested and none were positive.We believe that single port surgery for colon cancer is a feasible and safe procedure with surgical results comparable to conventional laparoscopic procedures.展开更多
AIM: To investigate the relationship between serum vitamin D3 levels and liver fibrosis or inflammation in treatment-naive Chinese patients with chronic hepatitis C(CHC).METHODS: From July 2010 to June 2011, we enroll...AIM: To investigate the relationship between serum vitamin D3 levels and liver fibrosis or inflammation in treatment-naive Chinese patients with chronic hepatitis C(CHC).METHODS: From July 2010 to June 2011, we enrolled 122 CHC patients and 11 healthy controls from Dingxicity, Gansu Province, China. The patients were infected with Hepatitis C virus(HCV) during blood cell retransfusion following plasma donation in 1992-1995, and had never received antiviral treatment. At present, all the patients except two underwent liver biopsy with ultrasound guidance. The Scheuer Scoring System was used to evaluate hepatic inflammation and the Metavir Scoring System was used to evaluate hepatic fibrosis. Twelve-hour overnight fasting blood samples were collected in the morning of the day of biopsy. Serum levels of alanine aminotransferase, aspartate aminotransferase, total bilirubin, direct bilirubin, cholineste rase, prothrom binactivity, albumin, γ-glutamyl transpeptidase, hemoglobin, calcium and phosphorus were determined. Serum HCV RNA levels were measured by real-time PCR. Serum levels of 25-hydroxyvitamin D3 [25(OH)D3] and 24,25-dihydroxyvitamin D3 [24,25(OH)2D3] were measured by high-performance liquid chromatography tandem mass spectrometry.R E S U LT S : Serumlevels of 2 5(OH) D3 but not 24,25(OH)2D3 were significantly lower in CHC patients than in control subjects. Serum 25(OH)D3 levels did not correlate with liver fibrosis, inflammation, patient age, or levels of alanine aminotransferase, aspartate aminotransferase, total bilirubin, direct bilirubin, prothrombin activity, cholinesterase or HCV RNA. However, serum 25(OH)D3 levels did correlate with serum 24,25(OH)2D3 levels. Serum 25(OH)D3 and 24,25(OH)2D3 levels, and the 25(OH)D3/24,25(OH)2D3 ratio, have no difference among the fibrosis stages or inflammation grades.CONCLUSION: We found that serum levels of 25(OH)D3 and its degradation metabolite 24,25(OH)2D3 did not correlate with liver fibrosis in treatment-naive Chinese patient with CHC.展开更多
his paper adopts the 3-3-2 information processing method for the capture of moving objects as its premise, and proposes a basic principle of three-dimensional (3D) imaging using biological compound eye. Traditional bi...his paper adopts the 3-3-2 information processing method for the capture of moving objects as its premise, and proposes a basic principle of three-dimensional (3D) imaging using biological compound eye. Traditional bionic vision is limited by the available hardware. Therefore, in this paper, the new-generation technology of microlens-array light-field camera is proposed as a potential method for the extraction of depth information from a single image. A significant characteristic of light-field imaging is that it records intensity and directional information from the lights entering the camera. Herein, a refocusing method using light-field image is proposed. By calculating the focusing cost at different depths from the object, the imaging plane of the object is determined, and a depth map is constructed based on the position of the object’s imaging plane. Compared with traditional light-field depth estimation, the depth map calculated by this method can significantly improve resolution and does not depend on the number of light-field microlenses. In addition, considering that software algorithms rely on hardware structure, this study develops an imaging hardware that is only 7 cm long based on the second-generation microlens camera’s structure, further validating its important refocusing characteristics. It thereby provides a technical foundation for 3D imaging with a single camera.展开更多
A new motion compensated 3 D wavelet transform (MC 3DWT) video coding scheme is presented in this paper. The new coding scheme has a good performance in average PSNR, compression ratio and visual quality of reconst...A new motion compensated 3 D wavelet transform (MC 3DWT) video coding scheme is presented in this paper. The new coding scheme has a good performance in average PSNR, compression ratio and visual quality of reconstructions compared with the existing 3 D wavelet transform (3DWT) coding methods and motion compensated 2 D wavelet transform (MC WT) coding method. The new MC 3DWT coding scheme is suitable for very low bit rate video coding.展开更多
文摘根据单缸内燃机的工作原理 ,结合《热能与动力机械基础》多媒体教学软件的使用条件和特点 ,介绍了 3 D Studio MAX的三种建模方法和软件功能 ,阐述了利用 3 D StudioMAX创建内燃机三维模型和动态模拟过程 .开发过程打破了以专业开发工具开发内燃机模型的常规模式 ,尝试以通用软件开发内燃机三维动态模型 。
基金Supported by Chongqing Science and Health Combined Medical Discipline,No.2020MSXM012。
文摘BACKGROUND Polyether ether ketone(PEEK)is a high-performance medical polymer,and there are some clinical cases of PEEK prosthesis implantation.However,application of 3D-printed injection-molded PEEK lunate prosthesis for treatment of stage Ⅲ Kienböck’s disease has not been reported.This study’s purpose was to analyze the clinical efficacy of 3D-printed injection-molded PEEK lunate prosthesis in the treatment of stage Ⅲ Kienböck’s disease and thus provide a good therapeutic choice for Kienböck’s disease.CASE SUMMARY We report a patient with stage Ⅲ Kienböck’s disease.With the healthy lunate bone as reference,3D lunate reconstruction was performed using a mirroring technique.A PEEK lunate prosthesis was prepared by 3D printing and injection molding,and then it was inserted into the original anatomical position after removing the necrotic lunate bone.Wrist pain and function,anatomical suitability of the lunate prosthesis,and complications were evaluated and analyzed postoperatively.At the last visit(one year after surgery),the range of motion,grasp force,visual analog scale score and Cooney score of the affected wrist were significantly improved,and postoperative X-ray examination indicated that the lunate prosthesis had good anatomical suitability for adjacent bony structures.CONCLUSION The 3D-printed injection-molded PEEK lunate prosthesis demonstrated definite efficacy in treating stage Ⅲ Kienböck’s disease.
文摘We report the first case of single port laparoscopic right hemicolectomy for advanced colon cancer.An abdominal 3 cm length incision was made via the umbilicus.A small wound retractor and a surgical glove were used as a single port.All soft tissue anterior to the superior mesenteric vein was completely removed and D3 lymph node dissection was achieved.The total operative time was 180 min with minimal blood loss (<50 mL).The size of the tumor was 5 cm×3 cm and its tumor stage was T3N0.Sixty-nine lymph nodes were harvested and none were positive.We believe that single port surgery for colon cancer is a feasible and safe procedure with surgical results comparable to conventional laparoscopic procedures.
基金Grants from High technical personnel training item from Beijing Health System,No.2011-3-083,No.2013-3-071Beijing Municipal Science&Technology Commission,No.Z131107002213019,No.Z151100004015066+4 种基金Base to Clinical Scientific Research Cooperation fund of Capital Medical University No.15JL67National Science and Technology Key Project on"Major Infectious Diseases such as HIV/AIDS,Viral Hepatitis Prevention and Treatment",No.2012ZX10002004-006,No.2012ZX10004904-003-001,and No.2013ZX10002002-006Beijing Municipal Administration of Hospitals Clinical medicine Development of special funding support,No.XM201308National Key Subject Construction Project,NO.WJWYA-2014-002Scientific research base construction-the major infectious diseases prevention and control of collaborative innovation center,No.115215
文摘AIM: To investigate the relationship between serum vitamin D3 levels and liver fibrosis or inflammation in treatment-naive Chinese patients with chronic hepatitis C(CHC).METHODS: From July 2010 to June 2011, we enrolled 122 CHC patients and 11 healthy controls from Dingxicity, Gansu Province, China. The patients were infected with Hepatitis C virus(HCV) during blood cell retransfusion following plasma donation in 1992-1995, and had never received antiviral treatment. At present, all the patients except two underwent liver biopsy with ultrasound guidance. The Scheuer Scoring System was used to evaluate hepatic inflammation and the Metavir Scoring System was used to evaluate hepatic fibrosis. Twelve-hour overnight fasting blood samples were collected in the morning of the day of biopsy. Serum levels of alanine aminotransferase, aspartate aminotransferase, total bilirubin, direct bilirubin, cholineste rase, prothrom binactivity, albumin, γ-glutamyl transpeptidase, hemoglobin, calcium and phosphorus were determined. Serum HCV RNA levels were measured by real-time PCR. Serum levels of 25-hydroxyvitamin D3 [25(OH)D3] and 24,25-dihydroxyvitamin D3 [24,25(OH)2D3] were measured by high-performance liquid chromatography tandem mass spectrometry.R E S U LT S : Serumlevels of 2 5(OH) D3 but not 24,25(OH)2D3 were significantly lower in CHC patients than in control subjects. Serum 25(OH)D3 levels did not correlate with liver fibrosis, inflammation, patient age, or levels of alanine aminotransferase, aspartate aminotransferase, total bilirubin, direct bilirubin, prothrombin activity, cholinesterase or HCV RNA. However, serum 25(OH)D3 levels did correlate with serum 24,25(OH)2D3 levels. Serum 25(OH)D3 and 24,25(OH)2D3 levels, and the 25(OH)D3/24,25(OH)2D3 ratio, have no difference among the fibrosis stages or inflammation grades.CONCLUSION: We found that serum levels of 25(OH)D3 and its degradation metabolite 24,25(OH)2D3 did not correlate with liver fibrosis in treatment-naive Chinese patient with CHC.
基金The National Major Project Research and Development Project (2017YFB0503003)The National Natural Science Foundation of China(61101157, 60602042).
文摘his paper adopts the 3-3-2 information processing method for the capture of moving objects as its premise, and proposes a basic principle of three-dimensional (3D) imaging using biological compound eye. Traditional bionic vision is limited by the available hardware. Therefore, in this paper, the new-generation technology of microlens-array light-field camera is proposed as a potential method for the extraction of depth information from a single image. A significant characteristic of light-field imaging is that it records intensity and directional information from the lights entering the camera. Herein, a refocusing method using light-field image is proposed. By calculating the focusing cost at different depths from the object, the imaging plane of the object is determined, and a depth map is constructed based on the position of the object’s imaging plane. Compared with traditional light-field depth estimation, the depth map calculated by this method can significantly improve resolution and does not depend on the number of light-field microlenses. In addition, considering that software algorithms rely on hardware structure, this study develops an imaging hardware that is only 7 cm long based on the second-generation microlens camera’s structure, further validating its important refocusing characteristics. It thereby provides a technical foundation for 3D imaging with a single camera.
文摘A new motion compensated 3 D wavelet transform (MC 3DWT) video coding scheme is presented in this paper. The new coding scheme has a good performance in average PSNR, compression ratio and visual quality of reconstructions compared with the existing 3 D wavelet transform (3DWT) coding methods and motion compensated 2 D wavelet transform (MC WT) coding method. The new MC 3DWT coding scheme is suitable for very low bit rate video coding.
