Addition of Fe B C and Fe Mo B C m aster alloy pow ders to Fe Mo B Csintered steels can ac tivate the sintering process by liquid phase sintering . The for m ation of liquid ( α- Fe + ( Fe , Mo...Addition of Fe B C and Fe Mo B C m aster alloy pow ders to Fe Mo B Csintered steels can ac tivate the sintering process by liquid phase sintering . The for m ation of liquid ( α- Fe + ( Fe , Mo) 2 B+ Fe3( B, C) → L) i m proves m echanical properties of the steels , and ultim ate tensilestrengths of 684 774 M Pa , i m pact energy of 47 ±7 Jand elongation of 2 5 ±0 9 were ob tained . Optim u m a mount of liquid phase exists , and alarge a mount of liquid phase will re sult in the form ation of continuous netw ork of liquid phase that is detrim ental to strength andelongation .展开更多
To improve the reliability and accuracy of the global po- sitioning system （GPS）/micro electromechanical system （MEMS）- inertial navigation system （INS） integrated navigation system, this paper proposes two diff...To improve the reliability and accuracy of the global po- sitioning system （GPS）/micro electromechanical system （MEMS）- inertial navigation system （INS） integrated navigation system, this paper proposes two different methods. Based on wavelet threshold denoising and functional coefficient autoregressive （FAR） model- ing, a combined data processing method is presented for MEMS inertial sensor, and GPS attitude information is also introduced to improve the estimation accuracy of MEMS inertial sensor errors. Then the positioning accuracy during GPS signal short outage is enhanced. To improve the positioning accuracy when a GPS signal is blocked for long time and solve the problem of the tra- ditional adaptive neuro-fuzzy inference system （ANFIS） method with poor dynamic adaptation and large calculation amount, a self-constructive ANFIS （SCANFIS） combined with the extended Kalman filter （EKF） is proposed for MEMS-INS errors modeling and predicting. Experimental road test results validate the effi- ciency of the proposed methods.展开更多
AIM: To evaluate the change in spectrum of gastric polyps in the Chinese population in the past ten years.METHODS: A total of 157902 consecutive patients undergoing esophagogastroduodenoscopy(EGD) from 2004 to 2013 in...AIM: To evaluate the change in spectrum of gastric polyps in the Chinese population in the past ten years.METHODS: A total of 157902 consecutive patients undergoing esophagogastroduodenoscopy(EGD) from 2004 to 2013 in a tertiary hospital were retrospectively reviewed using an EGD database.Endoscopic records of 4043 patients diagnosed with gastric polyps were recalled for analysis.Data including demographics,information on polyps such as location,pathological diagnosis,reflux esophagitis and Helicobacter pylori infection were obtained.We focused on epithelial polyps,especially hyperplastic polyps,fundic gland polyps and adenomas,and histological classification of specimens from biopsy and endoscopic polypectomy was performed by professional pathologists,based on the updated guidelines.To explore the age distribution of gastric polyps over time,we divided patients with polyps into four groups: A(aged < 30 years),B(aged 30-44 years),C(aged 45-59 years) and D(aged > 60 years).Differences in localization,age,and sex distribution of gastric polyps were analyzed by statistical software.RESULTS: A total of 157902 EGD procedures were performed in ten years at our digestive endoscopy center,of which 4043 cases were diagnosed with gastric polyps confirmed by pathology.There were 2574(63%) female and 1469(37%) male patients with an average age of 54.7 years.The overall prevalence of gastric polyps was 2.6%(4043/157902).Our database demonstrated a rising prevalence of gastric polyps over the decade,increasing from 1.0%(80/8025) to 4.70%(828/17787) between 2004 and 2013.There has been a change in the spectrum of gastric polyps with the frequencies of FGPs increasing from 19%(15/80) to 77%(638/828) and hyperplastic polyps decreasing from 65%(52/80) to 15%(123/828).Moreover,data on 1921 polyps in 828 patients diagnosed with gastric polyps in 2013 showed that FGP was the most common type in the current polyp spectrum,making up 81.3%(1562/1921).Location and age distribution of gastric polyps have also altered.The prevalence of pol展开更多
病例：患者,男,47岁。因“食欲不佳1月余,尿色加深7天”于2015年5月19日入院就诊。患者于2015年1月17日因左胫骨平台骨折,1月17日至3月30日服用迈之灵片0.3 g bid po,1月17日至3月15日服用接骨七厘片0.52 g bid po,2月1日至5月15日服用...病例：患者,男,47岁。因“食欲不佳1月余,尿色加深7天”于2015年5月19日入院就诊。患者于2015年1月17日因左胫骨平台骨折,1月17日至3月30日服用迈之灵片0.3 g bid po,1月17日至3月15日服用接骨七厘片0.52 g bid po,2月1日至5月15日服用骨康胶囊（贵州维康药业有限公司,批号：20140924.）1.6 g tid po。展开更多
文摘Addition of Fe B C and Fe Mo B C m aster alloy pow ders to Fe Mo B Csintered steels can ac tivate the sintering process by liquid phase sintering . The for m ation of liquid ( α- Fe + ( Fe , Mo) 2 B+ Fe3( B, C) → L) i m proves m echanical properties of the steels , and ultim ate tensilestrengths of 684 774 M Pa , i m pact energy of 47 ±7 Jand elongation of 2 5 ±0 9 were ob tained . Optim u m a mount of liquid phase exists , and alarge a mount of liquid phase will re sult in the form ation of continuous netw ork of liquid phase that is detrim ental to strength andelongation .
基金supported by the National Natural Science Foundation of China (60902055)
文摘To improve the reliability and accuracy of the global po- sitioning system （GPS）/micro electromechanical system （MEMS）- inertial navigation system （INS） integrated navigation system, this paper proposes two different methods. Based on wavelet threshold denoising and functional coefficient autoregressive （FAR） model- ing, a combined data processing method is presented for MEMS inertial sensor, and GPS attitude information is also introduced to improve the estimation accuracy of MEMS inertial sensor errors. Then the positioning accuracy during GPS signal short outage is enhanced. To improve the positioning accuracy when a GPS signal is blocked for long time and solve the problem of the tra- ditional adaptive neuro-fuzzy inference system （ANFIS） method with poor dynamic adaptation and large calculation amount, a self-constructive ANFIS （SCANFIS） combined with the extended Kalman filter （EKF） is proposed for MEMS-INS errors modeling and predicting. Experimental road test results validate the effi- ciency of the proposed methods.
文摘AIM: To evaluate the change in spectrum of gastric polyps in the Chinese population in the past ten years.METHODS: A total of 157902 consecutive patients undergoing esophagogastroduodenoscopy(EGD) from 2004 to 2013 in a tertiary hospital were retrospectively reviewed using an EGD database.Endoscopic records of 4043 patients diagnosed with gastric polyps were recalled for analysis.Data including demographics,information on polyps such as location,pathological diagnosis,reflux esophagitis and Helicobacter pylori infection were obtained.We focused on epithelial polyps,especially hyperplastic polyps,fundic gland polyps and adenomas,and histological classification of specimens from biopsy and endoscopic polypectomy was performed by professional pathologists,based on the updated guidelines.To explore the age distribution of gastric polyps over time,we divided patients with polyps into four groups: A(aged < 30 years),B(aged 30-44 years),C(aged 45-59 years) and D(aged > 60 years).Differences in localization,age,and sex distribution of gastric polyps were analyzed by statistical software.RESULTS: A total of 157902 EGD procedures were performed in ten years at our digestive endoscopy center,of which 4043 cases were diagnosed with gastric polyps confirmed by pathology.There were 2574(63%) female and 1469(37%) male patients with an average age of 54.7 years.The overall prevalence of gastric polyps was 2.6%(4043/157902).Our database demonstrated a rising prevalence of gastric polyps over the decade,increasing from 1.0%(80/8025) to 4.70%(828/17787) between 2004 and 2013.There has been a change in the spectrum of gastric polyps with the frequencies of FGPs increasing from 19%(15/80) to 77%(638/828) and hyperplastic polyps decreasing from 65%(52/80) to 15%(123/828).Moreover,data on 1921 polyps in 828 patients diagnosed with gastric polyps in 2013 showed that FGP was the most common type in the current polyp spectrum,making up 81.3%(1562/1921).Location and age distribution of gastric polyps have also altered.The prevalence of pol
文摘病例：患者,男,47岁。因“食欲不佳1月余,尿色加深7天”于2015年5月19日入院就诊。患者于2015年1月17日因左胫骨平台骨折,1月17日至3月30日服用迈之灵片0.3 g bid po,1月17日至3月15日服用接骨七厘片0.52 g bid po,2月1日至5月15日服用骨康胶囊（贵州维康药业有限公司,批号：20140924.）1.6 g tid po。
