Deposition parameters that have great influences on hot filament chemical vapor deposition (HFCVD) diamond films growth on inner hole surfaces of WC?Co substrates mainly include the substrate temperature (t), carbon c...Deposition parameters that have great influences on hot filament chemical vapor deposition (HFCVD) diamond films growth on inner hole surfaces of WC?Co substrates mainly include the substrate temperature (t), carbon content (φ), total pressure (p) and total mass flow (F). Taguchi method was used for the experimental design in order to study the combined effects of the four parameters on the properties of as-deposited diamond films. A new figure-of-merit (FOM) was defined to assess their comprehensive performance. It is clarified thatt,φandp all have significant and complicated effects on the performance of the diamond film and the FOM, which also present some differences as compared with the previous studies on CVD diamond films growth on plane or external surfaces. Aiming to deposit HFCVD diamond films with the best comprehensive performance, the key deposition parameters were finally optimized as:t=830 °C,φ=4.5%,p=4000 Pa,F=800 mL/min.展开更多
In order to compare the advantages and disadvantages of large-shed,middle-shed and small-shed upland seedling nurturing modes in japonica rice planting regions of North China, in this study, Tongyin 58, Tonghe 836 and...In order to compare the advantages and disadvantages of large-shed,middle-shed and small-shed upland seedling nurturing modes in japonica rice planting regions of North China, in this study, Tongyin 58, Tonghe 836 and Tonghe 835 were used as experimental materials and cultivated with large-shed, middle-shed and small-shed upland seedling nurturing modes to investigate active and effective accumulated temperature and rice seedling quality. According to the results, active and effective accumulated temperature in three different upland seedling nurturing treatments during seedling nurturing period were generally in a descending order of large shed 〉 middle shed 〉 small shed. The occurrence frequency of temperature exceeding the biological upper limit for rice growth in different upland seedling nurturing treatments demonstrated a descending order of large shed 〉 small shed 〉middle shed; the occurrence frequency of temperature below the biological lower limit demonstrated a descending order of small shed 〉 middle shed 〉 large shed.Plant height, root number, aboveground dry weight, underground dry weight and emergence rate varied significantly among different upland seedling nurturing modes,which showed a descending order of large shed 〉 middle shed 〉 small shed; leaf age and stem number in large shed was significantly higher than that in middle and small sheds, but there was no significant difference in leaf age and stem number between middle and small sheds; underground dry weight varied slightly between large and middle shed, but underground dry weight in large and middle shed was remarkably higher than that in small shed. In production, large-shed upland seedling nurturing is most appropriate technique, followed by middle-shed upland seedling nurturing. In large-shed upland seedling nurturing, ventilation and seedling hardening should be strengthened. Small-shed upland seedling nurturing technique is not recommended to be used in regions with low accumulated temperature at night. In small-shed upland seedling nurturing, the minimum temperature at night should be concerned, and heat preservation measures should be taken immediately when there is a sudden drop in temperature.展开更多
This review is part three of three and will present an update on the therapeutic options and procedures concerning gastrointestinal (GI) submucosal tumors (SMTs). The aim of this paper is to investigate the treatments...This review is part three of three and will present an update on the therapeutic options and procedures concerning gastrointestinal (GI) submucosal tumors (SMTs). The aim of this paper is to investigate the treatments of GI SMTs and to present a case of a gastrointestinal stromal tumor (GIST). Literature searches were performed to find information on therapy for GI SMTs. Based on these searches, the optimal therapeutic procedures could be outlined. The choice of treatment of localized tumors is endoscopic resection if possible or, alternatively, laparoscopic resection or surgical resection by an open procedure. However, benign SMTs should only be excised if symptoms are present, and GISTs should be treated with particular precautions. Irresectable or recurrent GISTs may be successfully treated with the tyrosine kinase inhibitor, imatinib.展开更多
The high incidence of gastric cancer has led to the initiation of cancer screening programs.As a result,the number of early gastric cancer cases has increased and consequentially,the cancer mortality rate has decrease...The high incidence of gastric cancer has led to the initiation of cancer screening programs.As a result,the number of early gastric cancer cases has increased and consequentially,the cancer mortality rate has decreased.Moreover,the development of minimally invasive endoscopic treatment has been introduced for these early lesions.Endoscopic submucosal dissection(ESD) is now recognized as one of the preferred treatment modalities for premalignant gastrointestinal epithelial lesions and early gastric cancer without lymph node metastasis.We review the results of ESD including experiences in Japan and Korea,as well as western countries.展开更多
Objective: To investigate the relative factors in the prognosis of endometrial cancer. Methods: From 1991 to 1999, 125 patients with endometrial cancer were treated in our hospital. Among them, 96 cases were received ...Objective: To investigate the relative factors in the prognosis of endometrial cancer. Methods: From 1991 to 1999, 125 patients with endometrial cancer were treated in our hospital. Among them, 96 cases were received operation. Their clinical and pathological data were analyzed retrospectively. Results: The overall survival rate at 5-year were 77.6%, stage I to stage IV were 85.9%, 68.8%, 53.8% and 0%, respectively. The survival rates at 5-year in histological grade 1, grade 2 and grade 3 were 100%, 77.1% and 38.1% respectively. There’s no significant difference between grade 1 and grade 2 (P > 0.05). As to grade 1 and grade 3, grade 2 and grade 3, there were significant differences (P < 0.05). The survival rate was 100% in patients with endometrium or superficial myometrial invasion and 35.3% in cases of deeper invasion (P < 0.01). Conclusion: Therapy based on operation is presently accepted as the first line management of endometrial cancer. Clinical stage, histo- logical grade, depth of myometrial invasion and lymph node metastasis are relative factors of prognosis.展开更多
Objective： To analyze MRI features of FIGO stage Ⅰ and Ⅱ endometrial carcinoma and to study the value of MRI in assessing myometrial and cervical invasion of endometrial carcinoma. Methods： Thirty patients with su...Objective： To analyze MRI features of FIGO stage Ⅰ and Ⅱ endometrial carcinoma and to study the value of MRI in assessing myometrial and cervical invasion of endometrial carcinoma. Methods： Thirty patients with surgicopathologically proven endometrial carcinoma were included in this retrospective study. All patients underwent Tl-weighted spin-echo, T2-weighted fast spin-echo and dynamic contrastenhanced fast multiplanar spoiled gradient echo sequences before surgery. The type, signal intensity and enhancement features of the tumors and the appearance of junctional zone or subendometrial enhancement were analyzed. The MRI diagnosis of myometrial and cervical invasion was correlated with pathologic findings.Results： Endometrial carcinoma demonstrated diffuse widening of endometrial stripe （n=14） or polypoid or large mass in the endometrial cavity （n=16）. The tumors were usually isointense relative to the myometrium on TlWI and hyperintensity on T2WI. In the first phase of dynamic contrast-enhanced sequences, diffuse endometrial carcinoma usually showed mild （n=8） or moderate （n=5） enhancement, while focal endometrial carcinoma tended to enhance markedly （n=6） or moderately （n=9）. On T2WI junctional zone was seen in 18 cases. On dynamic contrast-enhanced images subendometrial enhancement was seen in 17 cases. The sensitivity, specificity and diagnostic accuracy of dynamic contrast-enhanced images in combination with T2WI were 87.5%, 95.5% and 93.3% for assessing deep myometrial invasion, and 75%, 95.5% and 90% for assessing cervical invasion. Conclusion： MRI is accurate and reliable in the evaluation of myometrial and cervical invasion of endometrial carcinoma, and should be performed as preoperative routine examination.展开更多
The standard treatment of endometrial cancer or atypical hyperplasia is surgical removal of the uterus and ovaries. In early stage disease this has an excellent chance of cure but results in infertility. Although the ...The standard treatment of endometrial cancer or atypical hyperplasia is surgical removal of the uterus and ovaries. In early stage disease this has an excellent chance of cure but results in infertility. Although the majority of patients are postmenopausal an increasing number of patients with atypical hyperplasia or endometrial cancer are presenting with a desire to retain their fertile potential. In the last 8 years a number of studies have been published involving 403 patients with endometrial cancer and 151 patients with Atypical hyperplasia treated with high dose progestagens. The response rate is 76.2% and 85.6% respectively with endometrial cancer having a recurrence rate of 40.6%. There is a 26% recurrence rate in atypical hyperplasia. Overall 26.3% of those wishing to conceive had a live baby. Although concerns exist about the risks of medical treatment, those that fail this treatment do not appear to have a significantly poorer prognosis although 20 patients(3.6%) had either ovarian cancer or metastatic disease discovered during treatment or follow up.展开更多
Objective To investigate the clinical features and management of ureteral endometriosis. Methods Patients surgically and histologically diagnosed as ureteral endometriosis from January 2001 to January 2007 in Peking U...Objective To investigate the clinical features and management of ureteral endometriosis. Methods Patients surgically and histologically diagnosed as ureteral endometriosis from January 2001 to January 2007 in Peking Union Medical College Hospital were retrospectively reviewed. Results Ten patients were diagnosed as ureteral endometriosis among 7 561 cases with surgically and histologically proved diagnosis of endometriosis, with an incidence of 0.132%. Nine out of 10 patients were extrinsic ureteral endometriosis and concomitant with severe pelvic endometriosis, and the other was intrinsic ureteral endometriosis. Hormone therapy failed in 2 patients with urinary tract obstruction. Ureterolysis was performed in 6 patients and ureterectomy was performed in 4 patients. One case of ureteral recurrence was observed in a postmenopausal woman without hormonal replacement therapy who received laparoscopic ureterolysis and hysterectomy with bilateral adnexectomy. No relapse was observed in the other 9 patients. Conclusions Ureteral endometriosis is a rare entity. The upper urinary tract should be evaluated in patients with severe endometriosis, even in postmenopausal women. The treatment of ureteral endometriosis usually requires surgery, while ureterolysis should not be performed in patients with extensive disease. As a form of adjuvant therapy of surgery, hormonal therapy is an appropriate option.展开更多
Objective： Assess clinical efficacy and safety analysis of laparoscopic-assisted vaginal surgery and laparoscopic-alone surgery in treatment of endometrial cancer. Methods： select 76 cases of endometrial cancer pati...Objective： Assess clinical efficacy and safety analysis of laparoscopic-assisted vaginal surgery and laparoscopic-alone surgery in treatment of endometrial cancer. Methods： select 76 cases of endometrial cancer patients, divided into two groups, 40 in laparoscopic-alone group and 36 in laparoscopic-assisted group, and compare operation time, intraoperative blood loss, intraoperative complications, postoperative complications, lymph node number, anal exhaust time, indwelling catheter days and hospitalization days by group. Result： compared with laparoscopic-alone surgery, laparoscopic-assisted vaginal surgery has certain advantages in reducing intraoperative blood loss, intraoperative and postoperative complications, anal exhaust time, indwelling catheter days and hospitalization days. Discussion： laparoscopic-assisted vaginal surgery is a relatively safe, effective and good economic benefit surgical method in treatment of endometrial cancer.展开更多
A mixed lubrication model was established for piston skirt lubrication. The mathematical model developed in this paper incorporates governing equations of motion with average Reynolds equation. This model considers th...A mixed lubrication model was established for piston skirt lubrication. The mathematical model developed in this paper incorporates governing equations of motion with average Reynolds equation. This model considers the surfaceroughness and profile. The corresponding computer program can be used to calculate oscillatory motion of piston during the entire trajectory, which has the excellent convergence.In addition, a set of equipment, which adopt the laser induced fluorescent method, was developed to measure the oil film thickness between the piston and the bore.展开更多
基金Projects(51275302,51005154)supported by the National Natural Science Foundation of China
文摘Deposition parameters that have great influences on hot filament chemical vapor deposition (HFCVD) diamond films growth on inner hole surfaces of WC?Co substrates mainly include the substrate temperature (t), carbon content (φ), total pressure (p) and total mass flow (F). Taguchi method was used for the experimental design in order to study the combined effects of the four parameters on the properties of as-deposited diamond films. A new figure-of-merit (FOM) was defined to assess their comprehensive performance. It is clarified thatt,φandp all have significant and complicated effects on the performance of the diamond film and the FOM, which also present some differences as compared with the previous studies on CVD diamond films growth on plane or external surfaces. Aiming to deposit HFCVD diamond films with the best comprehensive performance, the key deposition parameters were finally optimized as:t=830 °C,φ=4.5%,p=4000 Pa,F=800 mL/min.
基金Supported by Program for Breeding of High-yield,High-quality,Multi-resistant Rice Varieties in the Middle and East of Jilin Province(20140309002NY)~~
文摘In order to compare the advantages and disadvantages of large-shed,middle-shed and small-shed upland seedling nurturing modes in japonica rice planting regions of North China, in this study, Tongyin 58, Tonghe 836 and Tonghe 835 were used as experimental materials and cultivated with large-shed, middle-shed and small-shed upland seedling nurturing modes to investigate active and effective accumulated temperature and rice seedling quality. According to the results, active and effective accumulated temperature in three different upland seedling nurturing treatments during seedling nurturing period were generally in a descending order of large shed 〉 middle shed 〉 small shed. The occurrence frequency of temperature exceeding the biological upper limit for rice growth in different upland seedling nurturing treatments demonstrated a descending order of large shed 〉 small shed 〉middle shed; the occurrence frequency of temperature below the biological lower limit demonstrated a descending order of small shed 〉 middle shed 〉 large shed.Plant height, root number, aboveground dry weight, underground dry weight and emergence rate varied significantly among different upland seedling nurturing modes,which showed a descending order of large shed 〉 middle shed 〉 small shed; leaf age and stem number in large shed was significantly higher than that in middle and small sheds, but there was no significant difference in leaf age and stem number between middle and small sheds; underground dry weight varied slightly between large and middle shed, but underground dry weight in large and middle shed was remarkably higher than that in small shed. In production, large-shed upland seedling nurturing is most appropriate technique, followed by middle-shed upland seedling nurturing. In large-shed upland seedling nurturing, ventilation and seedling hardening should be strengthened. Small-shed upland seedling nurturing technique is not recommended to be used in regions with low accumulated temperature at night. In small-shed upland seedling nurturing, the minimum temperature at night should be concerned, and heat preservation measures should be taken immediately when there is a sudden drop in temperature.
文摘This review is part three of three and will present an update on the therapeutic options and procedures concerning gastrointestinal (GI) submucosal tumors (SMTs). The aim of this paper is to investigate the treatments of GI SMTs and to present a case of a gastrointestinal stromal tumor (GIST). Literature searches were performed to find information on therapy for GI SMTs. Based on these searches, the optimal therapeutic procedures could be outlined. The choice of treatment of localized tumors is endoscopic resection if possible or, alternatively, laparoscopic resection or surgical resection by an open procedure. However, benign SMTs should only be excised if symptoms are present, and GISTs should be treated with particular precautions. Irresectable or recurrent GISTs may be successfully treated with the tyrosine kinase inhibitor, imatinib.
文摘The high incidence of gastric cancer has led to the initiation of cancer screening programs.As a result,the number of early gastric cancer cases has increased and consequentially,the cancer mortality rate has decreased.Moreover,the development of minimally invasive endoscopic treatment has been introduced for these early lesions.Endoscopic submucosal dissection(ESD) is now recognized as one of the preferred treatment modalities for premalignant gastrointestinal epithelial lesions and early gastric cancer without lymph node metastasis.We review the results of ESD including experiences in Japan and Korea,as well as western countries.
文摘Objective: To investigate the relative factors in the prognosis of endometrial cancer. Methods: From 1991 to 1999, 125 patients with endometrial cancer were treated in our hospital. Among them, 96 cases were received operation. Their clinical and pathological data were analyzed retrospectively. Results: The overall survival rate at 5-year were 77.6%, stage I to stage IV were 85.9%, 68.8%, 53.8% and 0%, respectively. The survival rates at 5-year in histological grade 1, grade 2 and grade 3 were 100%, 77.1% and 38.1% respectively. There’s no significant difference between grade 1 and grade 2 (P > 0.05). As to grade 1 and grade 3, grade 2 and grade 3, there were significant differences (P < 0.05). The survival rate was 100% in patients with endometrium or superficial myometrial invasion and 35.3% in cases of deeper invasion (P < 0.01). Conclusion: Therapy based on operation is presently accepted as the first line management of endometrial cancer. Clinical stage, histo- logical grade, depth of myometrial invasion and lymph node metastasis are relative factors of prognosis.
文摘Objective： To analyze MRI features of FIGO stage Ⅰ and Ⅱ endometrial carcinoma and to study the value of MRI in assessing myometrial and cervical invasion of endometrial carcinoma. Methods： Thirty patients with surgicopathologically proven endometrial carcinoma were included in this retrospective study. All patients underwent Tl-weighted spin-echo, T2-weighted fast spin-echo and dynamic contrastenhanced fast multiplanar spoiled gradient echo sequences before surgery. The type, signal intensity and enhancement features of the tumors and the appearance of junctional zone or subendometrial enhancement were analyzed. The MRI diagnosis of myometrial and cervical invasion was correlated with pathologic findings.Results： Endometrial carcinoma demonstrated diffuse widening of endometrial stripe （n=14） or polypoid or large mass in the endometrial cavity （n=16）. The tumors were usually isointense relative to the myometrium on TlWI and hyperintensity on T2WI. In the first phase of dynamic contrast-enhanced sequences, diffuse endometrial carcinoma usually showed mild （n=8） or moderate （n=5） enhancement, while focal endometrial carcinoma tended to enhance markedly （n=6） or moderately （n=9）. On T2WI junctional zone was seen in 18 cases. On dynamic contrast-enhanced images subendometrial enhancement was seen in 17 cases. The sensitivity, specificity and diagnostic accuracy of dynamic contrast-enhanced images in combination with T2WI were 87.5%, 95.5% and 93.3% for assessing deep myometrial invasion, and 75%, 95.5% and 90% for assessing cervical invasion. Conclusion： MRI is accurate and reliable in the evaluation of myometrial and cervical invasion of endometrial carcinoma, and should be performed as preoperative routine examination.
文摘The standard treatment of endometrial cancer or atypical hyperplasia is surgical removal of the uterus and ovaries. In early stage disease this has an excellent chance of cure but results in infertility. Although the majority of patients are postmenopausal an increasing number of patients with atypical hyperplasia or endometrial cancer are presenting with a desire to retain their fertile potential. In the last 8 years a number of studies have been published involving 403 patients with endometrial cancer and 151 patients with Atypical hyperplasia treated with high dose progestagens. The response rate is 76.2% and 85.6% respectively with endometrial cancer having a recurrence rate of 40.6%. There is a 26% recurrence rate in atypical hyperplasia. Overall 26.3% of those wishing to conceive had a live baby. Although concerns exist about the risks of medical treatment, those that fail this treatment do not appear to have a significantly poorer prognosis although 20 patients(3.6%) had either ovarian cancer or metastatic disease discovered during treatment or follow up.
文摘Objective To investigate the clinical features and management of ureteral endometriosis. Methods Patients surgically and histologically diagnosed as ureteral endometriosis from January 2001 to January 2007 in Peking Union Medical College Hospital were retrospectively reviewed. Results Ten patients were diagnosed as ureteral endometriosis among 7 561 cases with surgically and histologically proved diagnosis of endometriosis, with an incidence of 0.132%. Nine out of 10 patients were extrinsic ureteral endometriosis and concomitant with severe pelvic endometriosis, and the other was intrinsic ureteral endometriosis. Hormone therapy failed in 2 patients with urinary tract obstruction. Ureterolysis was performed in 6 patients and ureterectomy was performed in 4 patients. One case of ureteral recurrence was observed in a postmenopausal woman without hormonal replacement therapy who received laparoscopic ureterolysis and hysterectomy with bilateral adnexectomy. No relapse was observed in the other 9 patients. Conclusions Ureteral endometriosis is a rare entity. The upper urinary tract should be evaluated in patients with severe endometriosis, even in postmenopausal women. The treatment of ureteral endometriosis usually requires surgery, while ureterolysis should not be performed in patients with extensive disease. As a form of adjuvant therapy of surgery, hormonal therapy is an appropriate option.
文摘Objective： Assess clinical efficacy and safety analysis of laparoscopic-assisted vaginal surgery and laparoscopic-alone surgery in treatment of endometrial cancer. Methods： select 76 cases of endometrial cancer patients, divided into two groups, 40 in laparoscopic-alone group and 36 in laparoscopic-assisted group, and compare operation time, intraoperative blood loss, intraoperative complications, postoperative complications, lymph node number, anal exhaust time, indwelling catheter days and hospitalization days by group. Result： compared with laparoscopic-alone surgery, laparoscopic-assisted vaginal surgery has certain advantages in reducing intraoperative blood loss, intraoperative and postoperative complications, anal exhaust time, indwelling catheter days and hospitalization days. Discussion： laparoscopic-assisted vaginal surgery is a relatively safe, effective and good economic benefit surgical method in treatment of endometrial cancer.
文摘A mixed lubrication model was established for piston skirt lubrication. The mathematical model developed in this paper incorporates governing equations of motion with average Reynolds equation. This model considers the surfaceroughness and profile. The corresponding computer program can be used to calculate oscillatory motion of piston during the entire trajectory, which has the excellent convergence.In addition, a set of equipment, which adopt the laser induced fluorescent method, was developed to measure the oil film thickness between the piston and the bore.
