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Epidemiological Aspects of Maternal Deaths Observed on Arrival over a Decade at the Fousseyni Daou Hospital in Kayes
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作者 Mahamadou Diassana Ballan Macalou +9 位作者 Sitapha Dembele Robert Diarra Alima Sidibe Lassina Goita Samou Diarra Seydou Z. Dao Mamadou Haidara Famakan Kane Fantamady Camara Soumaila Traore 《Open Journal of Obstetrics and Gynecology》 2025年第1期108-117,共10页
Introduction: The objective of this work was to study maternal deaths noted on arrival in the Gynecology and Obstetrics Department at Fousseyni Daou Hospital in Kayes over a period of 10 years. Materials and Methods: ... Introduction: The objective of this work was to study maternal deaths noted on arrival in the Gynecology and Obstetrics Department at Fousseyni Daou Hospital in Kayes over a period of 10 years. Materials and Methods: This was a cross-sectional, descriptive study with data collection over a period of 10 years;The data collection was retrospective over nine years from January 1, 2013 to December 31, 2021 and prospective over one year from January 1, 2022 to December 31, 2022. This study focused on all patients whose death was noted on arrival during pregnancy, labor or in the postpartum period in the Gynecology-Obstetrics Department of Fousseyni Daou Hospital. Confidentiality and anonymity were respected. The processing and analysis of statistical data were carried out using SPSS 20.0 software. Results: During the study period, we recorded 93 cases of death noted on arrival out of a total of 606 maternal deaths, i.e., a frequency of 15.34%. The average age was 27 years with the extremes of 20 years and 34 years. They came mainly from rural areas at 74%, were married at 82%, uneducated at 51.6%, housewives at 87.1%. The profession of the spouses is worker at 37.6%. In our sample, evacuated patients were the most represented with 75.3%. Postpartum hemorrhage was the most frequent reason for admission with 22.6%. The deceased patients had no medical history at 86%. In our series, 59.5% of the deceased patients had not had antenatal consultations (CPN). Patients who died on arrival and who had given birth at home were the most represented with 54.8%. Deaths from immediate postpartum hemorrhage complicated by shock were the most frequent with 25.8% followed by severe anemia 8.6%. Deaths were mainly due to direct obstetric causes at 76.3%. In these deaths observed on arrival, the 2nd delay was identified at 48.4%. Conclusion: Maternal deaths observed on arrival remain frequent in the Kayes region. The main causes are immediate postpartum hemorrhage and anemia, which are almost all preventable causes of maternal death following the 1st and 2nd delay. 展开更多
关键词 Death Observed on Arrival Maternal Mortality kayes Hospital
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Socio-Epidemiological Aspects and Prognosis of Unassisted Deliveries Arriving at Fousseyni Daou Hospital in Kayes
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作者 Sitapha Dembele Mahamadou Diassana +9 位作者 Ballan Macalou Alima Sibibe Albachar Hamidou Daouda Fomba Mamadou Haidara Famakan Kane Cheickna Sylla Amadou Bocoum Sanogo Siaka Amara Soumaila Traoré 《Open Journal of Obstetrics and Gynecology》 CAS 2023年第2期360-371,共12页
Introduction: The World Health Organization estimates that each year more than 20 million women suffer from the after-effects of unattended childbirth, of which 800 women die every day as a result of obstetric complic... Introduction: The World Health Organization estimates that each year more than 20 million women suffer from the after-effects of unattended childbirth, of which 800 women die every day as a result of obstetric complications. Objective: Study the socio-epidemiological aspects and prognosis of unassisted deliveries arriving at the Fousseyni Daou De Kayes hospital. Materials and Methods: This was a descriptive, cross-sectional study with prospective collection, case-control that took place at the maternity ward of the Fousseyni Daou hospital in Kayes, from<sup> </sup>1 January to 31 December 2021. Results: The frequency of unattended birth was 4.1%. The 30 - 35 age group was the most represented with 32.5%. In our study 58.1% of cases were out of school, 19.4% were primigestes and 39.4% were multiparous. In our series 60.6% of cases had given birth at home and 39.4% along the way. The majority of cases regretted having given birth without the assistance of qualified personnel in 45.6%. Maternal complications were dominated by perineal lesions in 14.4% of cases, haemorrhage of delivery in 25% of cases, severe anaemia in 30% of cases;16.7% of newborns were in poor condition, 13.6% were fresh stillbirths, 15.6% of newborns had obstetric trauma. The maternal death rate on arrival was 3%. Conclusion: The frequency of unassisted childbirth is high in the Kayes region. Its complications can be serious for both the mother and the newborn. 展开更多
关键词 CHILDBIRTH Unassisted PROGNOSIS COMPLICATIONS kayes
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Epidemiological, Clinical, Bacteriological Profile of Urinary Tract Infection in the Internal Medicine Unit of the Fousseyni Daou Hospital in Kayes
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作者 Sangaré Drissa Cissé Sékou Mamadou +7 位作者 Guindo Youssouf Abdoulaye Diawara Diakité Niagalé Boly Berthé Bréhima Keita Kaly Issa Diallo Traore Djenebou Kaya Assetou Soucko 《Open Journal of Internal Medicine》 CAS 2023年第1期62-75,共14页
Introduction: Urinary tract infection is one of the most frequent public health problems in the world and concerns all ages. Objective: To describe the epidemiological, clinical and biological profile of urinary tract... Introduction: Urinary tract infection is one of the most frequent public health problems in the world and concerns all ages. Objective: To describe the epidemiological, clinical and biological profile of urinary tract infection in the internal medicine unit of the Fousseyni Daou hospital in Kayes. Methodology: It was a descriptive and cross-sectional study with retrospective data collection which took place from January 1 to December 31, 2020 at the Internal Medicine Unit of the Fousseyni Daou Hospital in Kayes. It covered all outpatients and hospitalized patients presenting with a urinary tract infection during the study period. Results: We identified 79 cases of urinary tract infection out of 145 requests for ECBU, that is a positivity rate of 53.10% and out of a total of 1883 admissions that is a hospital prevalence of 4.19%. The age groups of 36 to 45 years and 46 to 55 years were more represented in 28 cases (35.44%) and 25 cases (31.64%) with an average age of 45 years ± 10. The female sex was predominant, 42 cases (53.16%) with a sex ratio of 0.88. Housewives were more represented 28 cases (34.44%). The majority of patients resided in rural areas 49 cases (62.03%). The history was dominated by the following pathologies: hypertension 48.10%, diabetes 36.70% and gastropathy 30.37%. The main clinical manifestations were: Urinary burning 67 cases (84.81%), Dysuria 65 cases (82.27%), Pelvic pain 59 cases (74.68%), Fever 57 cases (72.15%). The epidemiological profile of the isolated strains was dominated by enterobacteriaceae, followed by gram-positive cocci and gram-negative bacilli. The main bacteria responsible for urinary tract infections in order of frequency: Escherichia coli (45.56%), Klebsiella pneumoniae (11.39%), Pseudomonas aeruginosa (8.86%), Staphylococcus aureus (7.59%), Streptococcus sp (6.33%), Enterobacter cloacae (3.79%), Acinetobacter sp (3.79%). The study of the susceptibility and resistance profiles of the isolated strains showed significant sensitivity of enterobacteriaceae to colistin and resistance to amoxicillin and to the amoxicillin + clavulanic acid combination. Conclusion: Urinary tract infections are a major public health problem since they are responsible for significant morbidity and mortality and a high cost of care. Knowledge of the epidemiological-clinical and bacteriological profile of these infections is essential for efficient management. 展开更多
关键词 Urinary Tract Infection EPIDEMIOLOGY CLINIC BACTERIOLOGY Internal Medicine Fousseyni Daou Hospital kayes MALI
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Etiological and Evolutionary Profile of Anemia in Patients Hospitalized in the Internal Medicine Unit of the Fousseyni Daou Hospital in Kayes
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作者 Sangaré Drissa Cissé Sékou Mamadou +7 位作者 Guindo Youssouf Abdoulaye Diawara Diakité Niagalé Boly Berthé Bréhima Keita Kaly Issa Diallo Traore Djenebou Soucko Kaya Assetou 《Open Journal of Internal Medicine》 CAS 2023年第1期51-61,共11页
Introduction: Anemia is one of the most common public health problems in the world and affects all ages. Objective: To describe the etiological and evolutionary profile of anemia in patients hospitalized in the Intern... Introduction: Anemia is one of the most common public health problems in the world and affects all ages. Objective: To describe the etiological and evolutionary profile of anemia in patients hospitalized in the Internal Medicine Unit of the Fousseyni Daou Hospital in Kayes. Methodology: It was a descriptive and cross-sectional study with retrospective data collection which took place from January 1 to December 31, 2020 at the Internal Medicine Unit of the Fousseyni Daou Hospital in Kayes. It covered all anemic patients hospitalized during the study period. Results: We identified 91 cases of anemia out of 200 patients admitted to the Unit that is a hospital prevalence of 45.5%. The age group of 26 to 35 years was the most represented, that is to say 29 cases (31.87%) with an average age of 43.55 years ± 17.48 years, the female sex predominated, 51 cases (56.04%) with a sex ratio of 0.78. Housewives represented 41 cases (45.05%). The majority of patients resided in rural areas 48 cases (52.75%). The main manifestations were: asthenia 75 cases (78.02%), vertigo 68 cases (74.72%), dyspnea 62 cases (68.13%), headaches 59 cases (64.83%), palpitations 55 cases (60.44%), conjunctival pallor 53 cases (58.24%), tachycardia 43 cases (47.25%), systolic murmur 18 cases (19.78%) and IMO 11 cases (12.09%). The associated pathologies were: infected diabetic wounds 25.27%, followed by bacterial pleuro-pneumopathy 18.68%. Biologically, microcytic anemia was the most frequent 49 cases (53.84%), followed by normocytic anemia 35 cases (38.46%) and macrocytic anemia 7 cases (7.7%). Anemia was hypochromic, 53 cases (58.24%) were more encountered compared to normochromic anemia 38 cases (41.76%). The anemia was: severe in 43 cases (47.25%), moderate 29 cases (31.87%) and mild 19 cases (20.88%). Inflammatory anemia is the most common etiological diagnosis in 60% of cases, followed by vitamin B12 deficiency anemia observed in 21% of patients and then blood diseases in 7.33% of cases. The main causes of death were HIV (50%) and kidney failure (33.33%). Conclusion: Anemia is a frequent symptom in internal medicine. It constitutes a real diagnostic challenge for the internist and this sometimes in an emergency context. The use of specialized examinations and labile blood products is essential in our hospital. 展开更多
关键词 ANEMIA ETIOLOGY Evolution Internal Medicine Fousseyni Daou Hospital kayes MALI
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Epidemiological and Clinical Profile of Patients Undergoing Primary Nephrological Consultation at the Fousseyni DAOU Hospital in Kayes, Mali
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作者 Magara Samaké Seydou Sy +10 位作者 Aboubacar Sidiki Fofana Hamadoun Yattara Sah Dit Baba Coulibaly Djénéba Diallo Nanko Doumbia Moctar Coulibaly Kodio Atabieme Djénéba Maiga Aboudou Messoum Dolo Nouhoum Coulibaly Saharé Fongoro 《Open Journal of Nephrology》 2022年第1期142-153,共12页
Introduction: The first nephrological consultation is often late, even in developed countries. This delay is related to the insidious nature of renal disease, the lack of qualified personnel and structures for the man... Introduction: The first nephrological consultation is often late, even in developed countries. This delay is related to the insidious nature of renal disease, the lack of qualified personnel and structures for the management of these conditions and the context of chronic insecurity in our country. In Kayes, there is no data related to the first consultations of patients with the nephrologist, hence the interest of this study, which aimed to describe the epidemiological and clinical characteristics of patients undergoing a first nephrological consultation in Kayes hospital. Materials and methods: This was a retrospective, descriptive study conducted from January 1 to December 31, 2020 at the nephrology unit of the Fousseyni DAOU hospital in Kayes. All patients received for nephrological consultation for whom a medical record was made were included. The following data were collected and analyzed: the specialty of the medical referent, the reason for consultation, sociodemographic characteristics and the renal assessment of patients. Patients who consulted for non-nephrological pathologies and those who had no medical record were not included. Results: We collected the records of 346 patients, composed of 180 (52%) women and 166 (48%) men, i.e. a sex ratio of 0.92. The age group [20 - 40 years] was the most represented, 107 cases or 30.9%, with a mean age of 48.84 ± 21.33 years and extremes of 1 and 90 years. Housewives were the most consulted population, 149 cases (41.33%). Patients consulted more between the months of January and February, 116 cases (33.5%), this period was followed by the months of October-December, July-September and April-June with respectively 94 cases (27.2%), 76 cases (22.0%) and 60 cases (17.3%). The patients were referred by the general practitioner in 59.5% (209 cases), specialist doctor, 26.0% (90 cases). The patients came mainly from hospital practitioners, 172 cases (49.7%), private clinic and practice 81 cases (23.4%), community health center (CSCOM), 69 cases (19.9%). The main reasons for consultation were hypercreatinemia 205 cases (59.2%), low back pain 46 cases (13.3%) and edematous syndrome 16 cases (4.6%). The mean blood pressure was 140/80 mmHg with extremes of 70 and 240 mmHg for systolic and 40 and 160 mmHg for diastolic. Mean creatinine was 660.53 μmol/l ± 821.311 with extremes of 46 and 5447 μmol/l. Patients transferred from the emergency department had a creatinine level above 700 μmol/l in 41.1% (39) of cases (p = 0.003 Person’s Chi-square = 8643 ddl = 1). Among the 316 patients who had a blood count, anemia was found in 221 (69.9%) and the mean hemoglobin level was 9.61 g/dl ± 3.11 with extremes of 1.70 g/dl and 19.56 g/dl. The diagnostic hypotheses evoked were acute renal failure (124 cases, i.e. 38.5%), chronic renal failure (81 cases, i.e. 23.7%). Conclusion: Primary nephrological consultation is more solicited by general practitioners. The consultations, often in the emergency room, were motivated by significant hypercreatinemia. Awareness of the nursing staff, the patients and the political authorities are necessary to encourage nephrological consultations at an early stage of the renal disease. 展开更多
关键词 Primary Consultation NEPHROLOGY kayes MALI
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Maternal Deaths in Patients Evacuated to the Fousseyni Daou Hospital in Kayes over a Decade
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作者 Mahamadou Diassana Sitapha Dembele +8 位作者 Ballan Macalou Alima Sibibe Falaye Keita Mamadou Haidara Famakan Kane Cheickna Sylla Amadou Bocoum Sanogo Siaka Amara Soumaila Traoré 《Open Journal of Obstetrics and Gynecology》 2023年第8期1389-1398,共10页
Introduction: Evacuation refers to the rapid transfer of a patient in an emergency, from one health center to another more equipped and better specialized. The objective of this study was to study maternal mortality i... Introduction: Evacuation refers to the rapid transfer of a patient in an emergency, from one health center to another more equipped and better specialized. The objective of this study was to study maternal mortality in patients evacuated to the gynecology and obstetrics department at the Fousseyni Daou Hospital in Kayes over a period of 10 years. Materials and Methods: This was a descriptive, cross-sectional, retrospective study over nine years from January 1, 2011 to December 31, 2019 and prospective over one year from January 1, 2020 to December 31, 2020 involving all patients or parturients evacuated for obstetrical causes and died in the gynecology-obstetrics department of the Fousseyni Daou Hospital. Confidentiality and anonymity were respected. The processing and analysis of the statistical data was carried out using SPSS 20.0 software. Results: during our study period we identified 38,854 obstetric admissions including 6758 evacuations or 17.4%, among the 6758 cases of obstetric evacuations 284 died, a frequency of 4.2%. The maternal death audit committee of the Fousseyni Daou hospital in Kayes audited 101/284 cases (files) or 35.5% of which 64 maternal deaths (63.4%) were considered inevitable. In our study the 20 - 29 age group was more represented with 38%. 85% of the deceased patients lived in rural areas. In our series, 63.7% of the deceased patients had not had antenatal consultations (NPC). Eclampsia accounted for 26.8% of admissions diagnoses and 30.9% of causes of death. Seventy-two (72%) of deaths occurred postpartum, 15% perpartum and 13% prepartum. Direct obstetric causes were predominant at 65.1%. Conclusion: Indicators of maternal deaths among evacuated patients remain poor in our work. Maternal deaths were driven by socio-economic and cultural factors, but also by factors related to the health system. 展开更多
关键词 Maternal Mortality EVACUATION kayes Hospital
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三种三尖瓣成形术治疗三尖瓣返流近期疗效分析 被引量:5
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作者 方智 蒙炜 张尔永 《中国修复重建外科杂志》 CAS CSCD 北大核心 2013年第10期1230-1233,共4页
目的比较3种三尖瓣成形术治疗三尖瓣反流术后近期反流程度的改善效果。 方法2010年10 月-2011年6月,共纳入148例风湿性心脏病行左心瓣膜置换手术同期行三尖瓣成形术患者。男32例,女116例;年龄15~66岁,平均47.5岁。根据三尖瓣成形... 目的比较3种三尖瓣成形术治疗三尖瓣反流术后近期反流程度的改善效果。 方法2010年10 月-2011年6月,共纳入148例风湿性心脏病行左心瓣膜置换手术同期行三尖瓣成形术患者。男32例,女116例;年龄15~66岁,平均47.5岁。根据三尖瓣成形术不同将患者分为3组:Cosgrove-Edwards成形环组(成形环组)58例、Kay成形组(Kay组)61例、DeVega成形组(DeVega组)29例。术前3组除三尖瓣反流程度(成形环组重于其余2组)、房颤及行射频消融术比例(成形环组高于其余2组)比较差异有统计学意义(P 〈 0.05)外,其余一般资料比较差异均无统计学意义(P 〉 0.05),具有可比性。记录3组患者围手术期资料,根据纽约心脏病协会(NYHA)分级标准行心功能评价, 心脏彩色超声多普勒检查记录围手术期及随访期间的三尖瓣反流程度。 结果术后Kay组及成形环组各1例因发生低心排综合征死亡。Kay组和成形环组分别有2例和1例患者发生肺部感染,成形环组有1例术后胸骨哆开再次手术,3组患者围手术期并发症发生率比较差异无统计学意义(P=0.840)。出院时3组患者三尖瓣反流程度均较术前显著改善(P 〈 0.001)。146例患者获随访,随访时间6~12个月,平均7.3个月。末次随访时3组患者心功能NYHA分级较术前均有所提高(P 〈 0.001),但3组心功能改善程度差异无统计学意义(χ2=0.120,P=0.942)。末次随访时,3组患者反流程度较术前有所改善(P 〈 0.001),且3组改善程度差异有统计学意义(χ2=26.827,P=0.000),成形环组术后反流改善程度明显优于其余2组(P 〈 0.001),DeVega组与Kay组术后反流改善程度差异无统计学意义(Z=1.467,P=0.142)。 结论采用 三尖瓣软质成形环成形术治疗三尖瓣反流患者,其术后近期三尖瓣反流程度改善效果优于Kay成形术及DeVega成形 术。 展开更多
关键词 三尖瓣反流 瓣环成形术 Kay成形术 DeVega成形术
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加权相位差分测频算法及其工程应用 被引量:4
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作者 王晓君 安国臣 张秀清 《河北科技大学学报》 CAS 2013年第5期446-450,470,共6页
相位差分算法是正弦频率估计中的一种重要方法。首先详细介绍了加权相位差分测频算法的原理,应用仿真方法分析了不同数据长度、不同信噪比情况下的测频性能,并与其他工程常用的测频算法进行了比较,然后对该算法在工程应用中的改进方法... 相位差分算法是正弦频率估计中的一种重要方法。首先详细介绍了加权相位差分测频算法的原理,应用仿真方法分析了不同数据长度、不同信噪比情况下的测频性能,并与其他工程常用的测频算法进行了比较,然后对该算法在工程应用中的改进方法和降低信噪比检测阈值的方法进行了论述,最后给出了基于FPGA的工程实现框图。 展开更多
关键词 Kay算法 测频 性能分析 工程应用
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联合二瓣化和改良Kay成形术处理左心瓣膜手术患者三尖瓣瓣环扩张的初步疗效观察 被引量:4
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作者 肖锡俊 蒋露 +3 位作者 李永波 唐红 周文霞 朱蔚 《中国胸心血管外科临床杂志》 CAS 2012年第5期516-519,共4页
目的观察用联合二瓣化和改良Kay成形术处理左心瓣膜手术患者三尖瓣瓣环扩张的临床结果。方法回顾性分析2010年1月至2011年5月华西医院158例伴有三尖瓣瓣环扩张(三尖瓣瓣环径/体表面积≥21 mm/m2)的左心瓣膜手术患者应用联合二瓣化和改良... 目的观察用联合二瓣化和改良Kay成形术处理左心瓣膜手术患者三尖瓣瓣环扩张的临床结果。方法回顾性分析2010年1月至2011年5月华西医院158例伴有三尖瓣瓣环扩张(三尖瓣瓣环径/体表面积≥21 mm/m2)的左心瓣膜手术患者应用联合二瓣化和改良Kay成形术处理三尖瓣的临床资料,其中男27例,女131例;年龄17~74(45.9±10.4)岁,心房颤动92例,窦性心律66例。三尖瓣反流(TR)程度根据超声心动图评价分为0~5级。结果 158例患者均康复出院。体外循环时间54~273(100.8±30.5)min,升主动脉阻断时间25~162(64.5±22.0)min,阻断期间最低食管温度26.3~34.1(28.5±1.1)℃。术后随访3~19(11.0±5.0)个月。手术前、后三尖瓣反流程度差异有统计学意义(2.2±1.3 vs.0.4±0.8,P<0.05)。与术前相比,患者术后右心房内径、右心室内径及左心房内径明显缩小,手术前、后右心房内径、右心室内径及左心房内径之间的差异有统计学意义[(56.5±11.1)mm vs.(47.5±8.9)mm,P<0.05;(22.4±4.4)mm vs(.20.1±3.3)mm,P<0.05;(62.8±20.1)mm vs(.51.9±14.1)mm,P<0.05]。随访期间有中度以上TR 5例(3.2%,5/158),其中中度TR 4例,中-重度TR 1例。患者手术前、后左心室射血分数的变化不明显(60.4%±7.9%vs.59.6%±8.2%,P>0.05)。结论以三尖瓣瓣环径/体表面积≥21 mm/m2作为左心瓣膜手术患者三尖瓣成形手术指征较为合理。应用联合二瓣化和改良Kay成形术处理三尖瓣防止伴有三尖瓣瓣环扩张的患者术后TR的残留或加重是有效的。 展开更多
关键词 左心瓣膜置换术 二瓣化 改良Kay成形术
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瓣环成形术在功能性三尖瓣关闭不全中的应用 被引量:5
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作者 陈天博 蓝斌 《实用医学杂志》 CAS 2003年第5期568-569,共2页
关键词 功能性三尖瓣关闭不全 Kay氏瓣环成形术 DeVega氏瓣环成形术 人造瓣环成形术 心功能分级 左室射血分数
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基于相位差分的Kay法SNR阈值分析及改进 被引量:1
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作者 杨宝强 刘苍毅 朱林户 《空军工程大学学报(自然科学版)》 CSCD 北大核心 2005年第4期34-36,58,共4页
基于相位差分的Kay法在单个复正弦信号频率估计方面有良好的统计性能,但在实际应用中存在明显的SNR阈值。本文分析讨论了Kay法的SNR阈值及形成的原因,提出了几种有效降低SNR阈值的方法,包括:滤波器法、频率粗估计法、滤波器组法等。这... 基于相位差分的Kay法在单个复正弦信号频率估计方面有良好的统计性能,但在实际应用中存在明显的SNR阈值。本文分析讨论了Kay法的SNR阈值及形成的原因,提出了几种有效降低SNR阈值的方法,包括:滤波器法、频率粗估计法、滤波器组法等。这些方法的优点在于降低SNR阈值的同时增加的计算量不大。计算机仿真验证了方法的有效性。 展开更多
关键词 Kay法 相位差分 ISNR阈值
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值得借鉴的美国音乐教育学生自我认知叙事研究——《自我认知透视──两位职前音乐教师的经历叙事研究》介评 被引量:1
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作者 高骊萍 吴亮花 《星海音乐学院学报》 CSSCI 2010年第2期75-79,共5页
凯.弗格森的《自我认知透视──两位职前音乐教师的经历叙事研究》一文,内容贴近美国音乐教育现实,分析独到深刻。其以学生个体为研究对象,基于对他们日常生活及故事叙述的记录而进行的研究,客观而具体,于个案中体现了共性。这个研究给... 凯.弗格森的《自我认知透视──两位职前音乐教师的经历叙事研究》一文,内容贴近美国音乐教育现实,分析独到深刻。其以学生个体为研究对象,基于对他们日常生活及故事叙述的记录而进行的研究,客观而具体,于个案中体现了共性。这个研究给我们的启示是:要重视研究音乐教育学生过去的经验及社会因素对个人认知的影响,承认并理解职前教师有着音乐表演者和教师双重身份的自我认知,并引导他们正确认识自我认知对其教学观念和行为的影响,从而帮助职前教师成长。其分析和讨论在科研以及教学两方面都值得我国高校从事音乐教育的教师借鉴。 展开更多
关键词 凯·弗格森(Kaye Ferguson) 美国音乐教育 自我认知 叙事研究 教师教育 音乐教师
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基于Kay加权的高动态载波跟踪环路初始频差估计方法 被引量:3
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作者 王晓君 姚远 《科学技术与工程》 北大核心 2023年第12期5129-5135,共7页
在高动态环境下,过大的载波跟踪环路初始频差会导致环路失锁或误锁。针对该情况已有学者通过增强环路跟踪稳定性和鉴频能力来解决,但仍存在鉴频范围小,精度低和运算量大等问题。为解决上述问题,提出了一种基于Kay加权的载波跟踪环路初... 在高动态环境下,过大的载波跟踪环路初始频差会导致环路失锁或误锁。针对该情况已有学者通过增强环路跟踪稳定性和鉴频能力来解决,但仍存在鉴频范围小,精度低和运算量大等问题。为解决上述问题,提出了一种基于Kay加权的载波跟踪环路初始频差估计方法,该算法首先对跟踪环路中I、Q两路的短时积分结果进行二倍角处理,然后,再对其使用四象限反正切鉴频器鉴频,最后借鉴Kay算法对鉴频结果加权得到频差估计值。通过与传统方法做计算机仿真对比,结果表明:在信噪比为-26 dB及以上时,在相同运算采样点数的前提下,本文方法估计精度相较于最大似然估计和三阶锁频辅助四阶锁相环路方法分别提升8.72 dB和19.59 dB或更高。在达到相同估计精度情况下,本文算法运算采样点数为最大似然估计方法的6.25%,算法运算量中加法与乘法次数仅为其1.7%和5.6%,计算时长为其1.56%。 展开更多
关键词 载波跟踪环路 Kay加权 初始频差 高动态环境
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一种解决雷达信号分选中“增批”问题的算法 被引量:2
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作者 赵葆昶 彭世蕤 +1 位作者 郁春来 孙经蛟 《电子信息对抗技术》 2011年第1期1-4,20,共5页
同一部雷达可以在不同时间段内大范围跨波段工作,在现行信号分选过程中,容易出现"增批"问题。利用信号的相参特性,构造脉冲初始相位差信号,用Kay算法和相关函数算法,分别对本振频率进行定量和定性估计,实现对同一辐射源信号... 同一部雷达可以在不同时间段内大范围跨波段工作,在现行信号分选过程中,容易出现"增批"问题。利用信号的相参特性,构造脉冲初始相位差信号,用Kay算法和相关函数算法,分别对本振频率进行定量和定性估计,实现对同一辐射源信号和不同辐射源信号的分选。仿真结果表明,该算法有效克服了信号分选过程中存在的"增批"问题。 展开更多
关键词 相参特性 雷达信号分选 增批 Kay算法
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一种基于Kay瞬时测频的PSK解码方法 被引量:1
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作者 曾斌 《电讯技术》 2008年第12期52-55,共4页
在电子侦察中,需要判断截获的雷达信号的调制方式和调制参数。利用Kay瞬时测频结合聚类分析的方法,可检测LFM、FSK和PSK信号。对相位编码信号,利用单脉冲多重相关积累算法从信号中提取相位跳变规律,并在此基础上给出了相位编码序列恢复... 在电子侦察中,需要判断截获的雷达信号的调制方式和调制参数。利用Kay瞬时测频结合聚类分析的方法,可检测LFM、FSK和PSK信号。对相位编码信号,利用单脉冲多重相关积累算法从信号中提取相位跳变规律,并在此基础上给出了相位编码序列恢复方法。该处理方法在信噪比较高时,计算速度优于短时傅里叶变换(STFT)等方法。最后,通过计算机仿真显示了该方法具有较好的精度和处理结果。 展开更多
关键词 电子侦察 信号处理 Kay方法 瞬时测频 相关积累 相位编码
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正弦波频率估计的全相位Kay算法
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作者 黄晓红 李娟 张琳 《河南理工大学学报(自然科学版)》 CAS 北大核心 2013年第4期472-475,485,共5页
针对正弦波频率估计对准确性的要求,对Kay算法进行改进,研究了一种全相位Kay算法.首先,讨论Kay算法在低信噪比下的缺陷,其次利用全相位频谱分析中可以降低旁瓣泄漏以及相位不变性的优点,并结合Kay算法及相位展开,得到全相位Kay算法,可... 针对正弦波频率估计对准确性的要求,对Kay算法进行改进,研究了一种全相位Kay算法.首先,讨论Kay算法在低信噪比下的缺陷,其次利用全相位频谱分析中可以降低旁瓣泄漏以及相位不变性的优点,并结合Kay算法及相位展开,得到全相位Kay算法,可以在较低信噪比(SNR<7 dB)条件下较好地估计正弦波频率,在中高信噪比条件下(SNR>7 dB),估计精度达到克拉美-罗限,并且在所有的频率区域性能稳定.最后,通过MATLAB仿真验证,该算法的均方根误差比Kay算法改进了4 dB,表现出了更佳的性能. 展开更多
关键词 全相位 Kay算法 频率估计 信噪比
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一种高精度FOA估计方法
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作者 何兵 刘刚 +2 位作者 赵鹏涛 高江 王虹 《无线电工程》 2011年第8期18-20,37,共4页
到达频率(FOA)估计问题是信号处理中研究的一个基本问题,广泛应用于通信、雷达、声纳以及其他信号处理领域。以广泛使用的数字调制信号为典型对象,开展FOA估计问题研究,针对单频复正弦信号估计问题,通过分析和仿真比较选择了高精度Kay... 到达频率(FOA)估计问题是信号处理中研究的一个基本问题,广泛应用于通信、雷达、声纳以及其他信号处理领域。以广泛使用的数字调制信号为典型对象,开展FOA估计问题研究,针对单频复正弦信号估计问题,通过分析和仿真比较选择了高精度Kay频率估计方法,基于Kay算法,设计了适合于数字调制信号瞬时频率估计的分段Kay频率估计方法。通过仿真说明了基于Kay算法的分段频率估计方法的有效性和精确估计能力。 展开更多
关键词 FOA Kay算法 频率估计
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改良三尖瓣成形术的效果评价
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作者 王俊 陈亮 +1 位作者 陈广明 陈亦江 《中国胸心血管外科临床杂志》 CAS 2012年第1期80-82,共3页
目的比较一种改良三尖瓣成形术与Kay成形术的成形效果,总结治疗经验。方法回顾性分析江苏省人民医院2006年1月至2008年1月60例功能性三尖瓣反流患者的临床资料。按手术方式不同将60例患者分为两组:改良三尖瓣成形术组(改良组),30例,其中... 目的比较一种改良三尖瓣成形术与Kay成形术的成形效果,总结治疗经验。方法回顾性分析江苏省人民医院2006年1月至2008年1月60例功能性三尖瓣反流患者的临床资料。按手术方式不同将60例患者分为两组:改良三尖瓣成形术组(改良组),30例,其中男14例,女16例;年龄(42.80±5.70)岁;Kay成形术组,30例,其中男15例,女15例;年龄(45.30±8.30)岁。术前两组患者的年龄、性别、心功能分级(NYHA)和三尖瓣反流分级差异均无统计学意义(P>0.05)。比较两组患者术前、术后住院及术后随访期间的右心房横径、右心室舒张期末内径和三尖瓣反流面积。结果两组患者手术时间、体外循环时间、住重症监护室时间、呼吸机辅助时间、住院时间差异均无统计学意义。术后全部患者痊愈出院。改良组随访时间为(19.62±8.65)个月,远期1例死于肺部感染;随访三尖瓣无反流13例,Ⅰ级反流14例,Ⅱ级反流2例,Ⅲ级反流1例,无Ⅳ级反流。Kay成形术组随访时间为(18.96±9.23)个月,远期死亡2例,分别死于顽固性右心衰竭和脑出血;随访无三尖瓣反流9例,Ⅰ级反流12例,Ⅱ级反流5例,Ⅲ级反流2例,Ⅳ级反流2例。术后早期改良组和Kay成形术组右心房横径[(4.51±0.85)cm vs.(5.69±1.21)cm]、右心室舒张期末内径[(2.85±0.45)cm vs.(3.47±0.83)cm]和三尖瓣反流面积[(4.17±2.54)cm2vs.(25.12±2.39 cm2)]较术前均明显下降(P<0.05);术后随访改良组和Kay成形术组右心房横径[(3.95±0.66)cm vs.(4.52±0.38)cm,P=0.705]差异无统计学意义,右心室舒张期末内径[(2.59±0.63)cm vs.(2.98±0.47)cm,P=0.002]和三尖瓣反流面积[(8.76±3.45)cm2vs.(12.16±5.28)cm2,P=0.004]改良组优于Kay成形术组。结论改良三尖瓣成形术的远期成形效果优于Kay成形术。 展开更多
关键词 三尖瓣成形术 Kay成形术 三尖瓣反流
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三尖瓣成形术治疗三尖瓣关闭不全进展 被引量:6
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作者 吴旭 王继相 佘凯 《中国心血管病研究》 CAS 2015年第10期874-877,共4页
三尖瓣关闭不全(tricuspid insufficiency,TI)引起的返流多继发于左心疾病或肺动脉高压.三尖瓣返流(tricuspid regurgitation,TR)会导致患者右室功能不全.具体而言,这样的损伤最终会导致左室输出量减少、术后不良事件及死亡率增加.... 三尖瓣关闭不全(tricuspid insufficiency,TI)引起的返流多继发于左心疾病或肺动脉高压.三尖瓣返流(tricuspid regurgitation,TR)会导致患者右室功能不全.具体而言,这样的损伤最终会导致左室输出量减少、术后不良事件及死亡率增加.因此,我们亟需解决左心手术同期行三尖瓣成形术,以提高患者术后生存质量.三尖瓣成形方式较多,且目前没有统一的标准.本文就三尖瓣成形术方式及效果进行综述. 展开更多
关键词 三尖瓣返流 三尖瓣成形术 Kay法 DeVega瓣环成形术 人工瓣环
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三尖瓣关闭不全使用人工成形环治疗效果评价 被引量:3
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作者 刘晓明 刘季春 徐华 《中国现代医学杂志》 CAS CSCD 北大核心 2013年第16期79-81,共3页
目的评价使用人工成形环对三尖瓣成形的中期效果。方法对30例三尖瓣关闭不全患者应用硬质三尖瓣成形环行三尖瓣成形术,术前三尖瓣每搏反流量(33.802±7.811)mL;并与同期30例行DeVega及Kay三尖瓣成形术患者进行比较,对照组术前三尖... 目的评价使用人工成形环对三尖瓣成形的中期效果。方法对30例三尖瓣关闭不全患者应用硬质三尖瓣成形环行三尖瓣成形术,术前三尖瓣每搏反流量(33.802±7.811)mL;并与同期30例行DeVega及Kay三尖瓣成形术患者进行比较,对照组术前三尖瓣每搏反流量(28.512±7.203)mL。术后对手术患者均进行随访,用彩超评价术后三尖瓣反流情况。结果两组均无手术死亡病例,术后心功能分级均较术前提高1、2级。出院前和术后6个月,两组患者三尖瓣反流量差别无显著性,术后随访1、2和3年,人工瓣环成形组三尖瓣反流量小于对照组(P<0.05、P<0.05和P<0.01)。结论应用人工成形环对三尖瓣进行成形,其中期效果明显优于传统的DeVega和Kay成形术。 展开更多
关键词 三尖瓣反流 三尖瓣成形术 人工瓣环 DeVega成形术 Kay成形术
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