Oesophageal Mycosis: Epidemiological and Clinical Aspects and Risk Factors for Occurrence in the Digestive Endoscopy Unit of the Donka National Hospital, Conakry CHU

Introduction: Oesophageal mycosis (OM) is one of the most common opportunistic infections in patients infected with HIV (Human Immunodeficiency Virus). However, this condition is increasingly observed in immunocompetent subjects. The aim of this study was to determine the endoscopic prevalence, clinical characteristics and risk factors for the occurrence of oesophageal mycosis in our department. Patients and Method: This was a prospective cross-sectional study of all patients who underwent oeso-gastroduodenal fibroscopy during the period from 1st January to 31st December 2022, i.e. one year, at the digestive endoscopy unit of the hepato-gastroenterology department of the Donka CHU national hospital in Conakry. All patients found to have oesophageal mycosis by FOGD were included. The endoscopy was performed using appropriate equipment: A Fujinon 4400 video endoscopy column;Three Fujinon EG 590 video gastroscopes;A hoover;Data were collected using a pre-established survey form and analysed using Epi info software version 6.0.4;Pearson’s Chi2 test as a test of independence and the exact 5% threshold ficher test. Results: Out of 1343 upper gastrointestinal endoscopies performed, 107 cases of oesophageal mycosis were found, representing a prevalence of 7.96%. The mean age was 40 years, with a male predominance of 55.42%. The sex ratio M/F was 1.24. The 45 and over age group was the most affected, with a prevalence of 40.43%, followed by the [35 - 45] age group, with a prevalence of 22.43%. Clinical symptoms were dominated by epigastralgia in 74.76% of cases, followed by odynophagia in 37.38% of cases, nausea and vomiting in 28.03% of cases, and pyrosis in 26.16% of cases. Oesophageal mycosis without oesophagitis was the most common endoscopic finding in 70% of cases. The main associated endoscopic lesions were erythemato-erosive and congestive gastropathy in 28.03% of cases, peptic oesophagitis (9.34%) and gastric ulcer (5.60%). The main risk factors found were positive HIV serology in 39.25% of cases, and diabetes in 24.30% of cases, with a statistically significant relationship of 0.02 and 0.01 respectively. Conclusion: Oesophageal mycosis is the most common opportunistic infection in patients with impaired cellular immunity. The prevalence of oesophageal mycosis in our series was 7.96%. This study enabled us to identify the main risk factors for the occurrence of oesophageal mycosis. Our country needs to step up its programme to combat and prevent immunodeficiency diseases, particularly HIV and diabetes.

Evaluation of Hepatic Fibrosis and Hepatic Steatosis by Pulse Elastography (FIBROSCAN/CAP) in Asymptomatic Patients about 170 Cases at the Donka CHU National Hospital in Conakry

Introduction: Fibroscan is a recent, non-invasive and non-irradiating diagnostic method. It is based on the principle of ultrasound, which enables liver tissue elasticity to be quantified using a probe, and fibrosis to be assessed. Fibroscan measures both elasticity correlated with hepatic fibrosis and CAP correlated with steatosis. The aim of this study was to evaluate hepatic fibrosis and steatosis using pulse elastometry (Fibroscan/CAP). Methods: This was a descriptive and analytical cross-sectional study in which 170 patients were included. It was conducted from October 1 2021 to December 31 2023, i.e. 27 months, in an outpatient clinic in the hepato-gastroenterology department of the Donka national hospital of the CHU Conakry. Results: Of the 170 patients identified, 87 were male (51%) and 83 female (49%), giving a M/F sex ratio of 1.04. The average age of our patients was 40. The 30 - 50 age group was the most affected, with a frequency of 58.23% (n = 99), followed by the 50 age group with a frequency of 29.41% (n = 50). Hepatomegaly, steatotic liver on ultrasonography, transaminase elevation and obesity were the main indications, respectively: (21.76%), (17.65%), (14.71%), and (13.53%). The examinations were requested by hepatogastroenterologists (47.06%), diabetologists (35.88%) and general practitioners (29%). Of the 170 patients, 100 patients (58.82%) had no significant fibrosis F0F1, 39 (22.94%) had moderate fibrosis F2, 20 patients (11.76%) had severe fibrosis F3 and 11 patients (6.47%) had fibrosis F4. Hepatic steatosis: 62 patients (36.47%) had no S0 steatosis;29.41% had S1 steatosis, 20% had S2 steatosis and 24 patients (14.11%) had S3 steatosis. Abdominal ultrasound revealed a normal liver in 67.05% of patients, hepatic steatosis in 29.41% and non-decompensated cirrhosis in 6 cases. Thus, 108 patients had the parameters required to calculate the Fatty Liver Index (FLI), steatosis was present in 20% of our patients, while 29.41% had an undetermined status and 24 14.11% had a normal FLI. Conclusion: Identifying subjects at risk of metabolic steatopathy, diagnosing and managing these patients is a public health issue and one of the future challenges of hepato-gastroenterology. Fibroscan is an increasingly popular screening tool for hepatic fibrosis and steatosis. The fight against obesity must be a priority.

Physico-chemical properties and nutrition quality of potato flour: chuño vs modern processing technology

Chuño production is a kind of ancient method of potato preservation that has been used to the present day.In this study,physicochemical property and nutrition quality of white chuño(WC),black chuño,and dehydrated potato flour prepared by hot air drying(AD)and freezing drying were analyzed and compared.The results revealed that the average particle size of the starch in WC is almost 10 times of the dehydrated potato flour by AD treatment according to the laser particle size meter.During the dehydration of WC,water-soluble minerals(K+,Mg2+),proteins,ascorbic acid,etc.were partly lost while Ca2+content increased dramatically.In addition,WC showed the lowest antioxidant capacity among the four different kinds of dehydrated potato products.The polyphenol oxidase activity of WC,black chuño and AD were between 0.62–12.2 U/g fresh weight,which indicated that the color will be stable when chuño was used as staple food ingredient in the subsequent process.Therefore,as a potato processed food,chuño displayed great potential for promotion in the cold and poor rural areas of the northern China.

Epidemiological and Prognostic Aspects of Obesity and Pregnancy in the Gynecology-Obstetrics Department at the Sylvanus Olympio University Hospital Center (CHU SO) in Lomé

Introduction: Obesity and pregnancy is a major public health problem worldwide, both maternal and fetal. Objective: This is to describe the epidemiological and prognostic aspects of obesity and pregnancy in the gynecology-obstetrics department at the Sylvanus Olympio University Hospital Center (CHU SO) in Lomé. Methodology: This was a descriptive cross-sectional study concerning obesed pregnant women. The survey was conducted from the 1st to the 30th of June 2022 at the CHU SO. Results: We enrolled 55 obese pregnant women. The frequency of obesity and pregnancy was 5.14%. Resellers were represented at 41.8%. The average age was 31 years old. As risk factors, 85.5% claimed to have a fatty diet and 76% did not practice sports. The gestational pathologies found during pregnancy were hypertension in 47.4% of cases, preeclampsia in 24.6% and gestational diabetes in 7%. Caesarean section was the way of delivery in 63.6% of cases and those who gave birth vaginally presented a tear of the soft tissues in 85% of cases. Birth weight was abnormal (low weight and excess weight) in 61.8% of cases. Conclusion: The association between obesity and pregnancy constitutes an important risk factor for the mother and the fetus.

文本解读与历史研究——以古藏文中的词语chu Gang、lta zhig、rje blas为例

古藏文中的chu Gang、lta zhig、rje blas等三个词语,屡次出现在吐蕃时期的石碑文、敦煌文、简牍文等中,在后期的部分《甘珠尔》《丹珠尔》文献中,也以变异或拆解的形式出现多次。通过古藏文学者对此类词语的解读和辨认,解答了chu Gang、lta zhig、rje blas等三个词语的部分含义。但随着文字考古研究的不断深入,古藏文的文化及阐释语境有了更大的拓展,也给研究古藏文的学者们提供了更全面的阐释空间。比如:古藏文chu Gang一词,在吐蕃时期仅用来表达君臣之间的忠信关系,至后宏时期其意义逐渐延伸,可以指称婚姻里的忠诚与信任,因此不能将其单纯地理解为英勇忠良之意;而lta zhi一词的语义不断虚化,逐渐具有了介词和虚词的功能,其所指也因语句搭配而发生变化,一味地将其解释为“他”或“他本人”是不准确的;通过词语考究和语素分析发现,rje dlas一词中的“rje”指的是君王,而“dlas”(藏文dlas后来作slas)则指帐中亲信,因此,rje dlas一词可以用来表达忠诚侍奉君王的一种责任和义务,rje dlas一词的这一含义也被后来的历史叙事所继承,部分教法史在叙述“六大决议法”(bkav gros chen mo)时,常以“保护赞普,不遗余力地侍奉”(rjevi sku vtsho zhing zho sha blar dbul)来扩解rje dlas一词。

Single-Centre Descriptive Epidemiological Study of Emergency Haemodialysis Patients in the Haemodialysis Unit of the CHU Point G (Mali)

Introduction: Haemodialysis is an exchange of solutes and water between the patient’s blood and a dialysis solution with a composition close to that of normal extracellular fluid, through a semi-permeable membrane. It is used in the treatment of acute or chronic renal failure. The aim was to study the clinical and paraclinical aspects and the outcome of patients starting dialysis treatment for renal failure in an emergency setting. Method: This was a prospective study from 1 January to 31 July 2020, with a sample of 62 patients receiving haemodialysis in an emergency setting in the nephrology department of the Point G University Hospital. Results: The study showed that the sex ratio was 1.38 in favour of men and that the mean age of patients was 36.82 years. The group of patients with a low socio-economic standard of living dominated, accounting for 71% of cases. Hypertension and anaemia were the predominant risk factors in 77.4% and 87.3% respectively. Hyperphosphaemia, hypocalcaemia and secondary hyperparathyroidism accounted for 94.7%, 98.2% and 97.7% respectively. Left ventricular hypertrophy was 29.27% on electrocardiogram and 22% on cardiac ultrasound. Isolated cardiomegaly was found in 30.76% of patients. The main indications for dialysis were uraemic syndrome (69.2%), pericardial friction (27.4), anuria for 48 hours (20.1%), hyperkalaemia (17.7%) and acute lung oedema (16.1%). The mean duration of haemodialysis was less than one month in one out of two cases. There was no significant association between age and time on dialysis (p = 0.178). The death rate was 20.97%. Case fatality was higher in patients whose duration of dialysis was less than one month than in the others (p = 0.0006). Conclusion: CKD is a public health problem in Mali. It affects young people, especially males. Low economic income is an obstacle to the management of this disease.

The Economic Factors of Utilizing the Salt of Sichuan to Purvey Chu and the War of Aid to Hubei

The background of this article takes place after modern China.It is an essential change in the history of the Chinese salt industry that Sichuan salt supplies to Hubei.Sichuan salt jumped out of the original sales range,sold in Hubei.Since then,Hubei has become the most essential selling place of Sichuan salt,which continues to affect the economy of Sichuan.The War of Aid to Hubei was an inter-regional war in the warlord era.In order to realize“Local governance of Hubei”,the exploiting warlord Wang Zhanyuan was expelled.Sichuan chose to send troops,which economic factors are significant.Mainly,the Sichuan salt played a crucial role in it.Through the study of this problem,we can see that the economic factors in modern times occupy an essential position in the competition of warlords and promote the progress of history.

Sydenham’s Chorea: Apropos of Three Observed Cases at the N’Djamena Mother and Child University Teaching Hospital (CHU-ME)-Chad

Introduction: Post-streptococcal chorea is the most common form of acquired chorea in children. Objective: The objective of this study was to contribute to better management of this condition by giving the characteristics of the epidemiological, clinical, biological, etiological, therapeutic and evolutionary aspects. Methodology: This was a retrospective and descriptive study from January 2021 to December 2021 which took place in the pediatrics department of the Mother and Child University Teaching Hospital of N’Djamena (CHU-ME). All the children in whom we observed abnormal involuntary movements whose age was less than or equal to 15 years were concerned. Result: there were three female children. The average age was 7.5, of which the two are 7 years old and the third is 8 years old. Two had a history of angina. A notion of polyarthralgia and dental caries was found in the third. The diagnosis of post-streptococcal chorea was retained on the basis of clinical arguments: observation of abnormal movements of the limbs and the face, which are involuntary, sudden with an insidious and progressive onset, muscular hypotonia, and psychic disorder. Medical imaging, in particular echocardiography, which objectified two cases of associated rheumatic valvular disease. Remission was observed in all three children after two weeks of treatment with haloperidol, penicillin. Those with associated rheumatic valve disease also received corticosteroid therapy. Complete remission of chorea was observed in all three girls. Prophylaxis in two patients based on Penicillin V was instituted. Conclusion: Although less frequent, post-streptococcal chorea is still seen in our country and is still an important health problem that needs more real medical efforts.

Self-Medication during Eye Affections among Consultant Patients at Chu-Iota

Introduction: According to the World Health Organization (WHO), self-medication consists in the fact that an individual resorts to a drug, on his own initiative or that of a loved one, with the aim of treating an ailment or a symptom that he identified himself without having recourse to a health professional. Self-medication involves the use of medicinal products by the consumer to treat self-recognized disorders or symptoms, or the intermittent or continued use of a medication prescribed by a physician for chronic or recurring diseases or symptoms. The aim of this study is to determine the different characteristics of ophthalmic self-medication at the CHU-IOTA. Patients and Method: We conducted a prospective study in patients of any age who resorted to ophthalmological self-medication before the first consultation or during the ophthalmological care of consulting patients at the CHU-IOTA between January 1 and July 31, 2021. Results: Over the period, 521 cases of ophthalmological self-medication were collected out of a total of 24,512 consultations, which corresponds to a frequency of 2.12%. The average age was 37.7 years, [2 months - 78]. The sex ratio was 0.50. Economic factors were the main factor mentioned, 66.79%. Corticosteroids accounted for 45.26% of the pharmacological class with dexamethasone/neomycin eye drops being the most widely used, i.e. 22.94%. The most common complication was corticosteroid-induced ocular hypertension on ametropia, i.e. 15.54%. Our patients were 68.13% educated. Among his educated patients 53.35% had no knowledge of the products. Conclusion: Given the harm associated with this practice, awareness and information campaigns aimed at the population, caregivers and pharmacists or pharmacy vendors are necessary in order to reduce the frequency of the practice of self-medication.

Refractive State and Macular Abnormalities at Oct in Albino at Chu Iota

Introduction: A rare genetic disease, albinism is globally characterized by specific deficits of the visual system associated with a variable hypopigmentation phenotype depending on the disruption of melanin production [1]. It is linked to a hereditary defect in the biosynthesis of melanin. Disease results in a generalized decrease in the pigmentation of the appendages, skin and eyes [2]. The aim of this study is to determine the different refractive errors and the different macular anomalies during the OCT examination in oculocutaneous albinism at the CHU-IOTA. Patients and Method: We conducted a prospective study in patients over 10 years of age with oculocutaneous or ocular albinism who consulted at the CHU-IOTA between July 1, 2020, and September 30, 2021. Results: Over the period, 105 cases of oculocutaneous albinism were collected out of a total of 42,024 consultations, which corresponds to a frequency of 0.2%. The average age was 26.2 years, (11 years to 48 years). The sex ratio was 1.6. Astigmatism was the most found refractive error in 50.48% of cases, followed by myopia in 29.52% of cases and farsightedness in 20% of cases. The macular thickness between 251 - 350 was the most commonly found in both eyes, i.e. 47.25% on the right and 53.55% on the left. The bulging macula was the most frequent pathology on the OCT at the level of the two eyes, i.e. 41.42% on the right and 50.6% on the left. Conclusion: Following the visual impairments linked to albinism, early optical care and access to OCT are necessary. Thus the accompaniment of a subject with albinism and associations of albinism must be global and meet specific needs, in order to prevent or avoid ocular complications.

Early Postoperative Deaths in the Surgical Intensive Care Unit of CHU-Kara

Aim: Review of early postoperative deaths in the surgical intensive care unit at CHU-Kara. Introduction: Surgery, one of the means of treatment of diseases, also presents risks for the patient, including early postoperative death linked to numerous risk factors. Methodology: This was a retrospective descriptive study conducted on the records of patients who died within 48 hours after surgery from November 1, 2019 to April 30, 2021. The study was conducted in the surgical intensive care unit and in the operating room. Results: Thirty-two early postoperative deaths or 2.22% out of 1442 operated with 30 deaths retained for the study. Male gender predominated (70%). The average age was 31.22 years. Farmers were more concerned (66.67%). The time to surgery was 1.6 days. ASA1 patients (40%) predominated followed by ASA IV (30%). 80% of patients were operated on as an emergency. Digestive pathologies 80% were more represented. General anaesthesia 86.66% was more practiced associating Propofol, Fentanyl, Ketamine and Atropine more frequently. The average duration of the procedures was 132.5 minutes. Intraoperative complications were associated with cardiac arrest and hemorrhage (33.34%). ASA class higher than 2, dirty surgery (46.67%), and delayed recovery (13.34%) were the incriminating risk factors. Death by hemodynamic shock and respiratory distress were the main causes 26.66%. Conclusion: Early postoperative mortality was high and involved all ages. Anesthesia and surgery, the low level of qualification of the intraoperative actors, the lesser intraoperative security;the association of anesthetic effects, the complexity of intraoperative lesions led to the increase of mortality. The combination of two or more factors was pejorative for the deaths.

Evaluation of the Effectiveness and Nature of Analgesia in the Medical-Surgical Emergency Department of CHU-Donka

Introduction: Pain assessment is an essential step towards pain relief. In our context, however, it is insufficient in emergency departments. The aim was to assess the nature and effectiveness of the analgesia used in the emergency department of the CHU-Donka. Method: This was a single-centre prospective observational study conducted over one month (November 2020) in the medical-surgical emergency department of CHU-Donka. All patients aged 18 or over admitted to the emergency department with moderate to severe acute pain were included. Results: We enrolled 880 patients, 615 of whom (69.88%) were in pain. Males predominated (65.2%), with a sex ratio of 1.87. The average age was 44.78 ± 16.41 years, with extremes ranging from 18 to 85 years. The most represented age group was 18 - 34 years, with 66.18%. Initial assessment of pain by nursing staff in 3 cases. Initial assessment of pain by the investigator was 100%, 74% moderate and 26% severe. No reassessment of pain by nursing staff. Reassessment by the interviewer was 100% and found 5% no pain, 61% mild pain, 24% moderate pain and 10% severe pain. With an average numerical scale of 3.77 ± 2.61 and extremes from 0 to 10. Average length of stay was 2.85 ± 1.48 hours, with extremes ranging from 45 minutes to 8 hours. Analgesia was administered with paracetamol alone (43.58%), combined with tramadol or nefopam. No patient received morphine. Conclusion: This study revealed a lack of pain assessment in our department.

Unusual Head Trauma: About Three Observations at the Chu Pr Bocar Sidy Sall (BSS) of Kati

Introduction: Penetrating head injuries are often due to human-to-human violence, mainly by firearms, those by stab are rare. CT is the exam of choice in the assessment of emergency lesions. We report three observations, all victims of knife assault during the brawl in order to clarify the contribution of DTM in the care. Observations: 1) Mr. I S, 21-year-old, student, was admitted with the hillside implanted in the skull. There were traces of blood on his face and clothes. There was no neurological deficit on examination. The CT scan performed showed the knife penetrating the vault of the skull at the left parietal level, up to 5 cm in the cerebral parenchyma with a minimal subdural and intracerebral hematoma;2) Mr. S C, 43-year-old, farmer, admitted with a large left fronto-temporo-parietal wound, bleeding and right hemiplegia. The CT scan performed showed a frontal linear fracture (with fronto-ethmoid hemosinus) and left temporoparietal with a parietal intraparenchymal hematoma and homolateral frontoparietal subdural hematoma;3) Mr. S B: 40 years old, driver, admitted with a parietal wound. The CT scan performed objectified a left parietal cortical hematoma in relation to a metallic foreign body (3000 HU) corresponding to the distal end of the knife penetrating the vault of the skull. They all underwent emergency surgery and received antibiotics and preventive serotherapy. The postoperative follow-up was simple, the follow-ups are without neurological sequelae. Conclusion: Head trauma by knife is rare, it results from inter-human violence. The lesion diagnosis is computed tomography. The prognosis depends on the severity.

Metabolic Syndrome in the Internal Medicine Department of Chu Point G

Introduction: The metabolic syndrome according to the IDF (International Diabetes Federation) is at the origin of the double global epidemic of type 2 diabetes and cardiovascular diseases. This work aims to study the metabolic syndrome in the internal medicine department of CHU Point G. Methodology: This was a descriptive study of patients who presented a metabolic syndrome according to the definition of the IDF definition, hospitalized in the internal medicine department of the CHU du point G for the period from January 1 2010 to December 31, 2019. Results: During the study period, 4189 patients were hospitalized, including 60 with metabolic syndrome, representing a hospital frequency of 1.43%. The sex ratio was 0.36. The age group of 50 and 60 years accounted for 28.3%. Forty-six point six percent (46.6%) of our patients were diabetic, 45% obese, 60% hypertensive, 70% sedentary and 10% smokers. Our patients had in 53.3% of cases a blood pressure figure ≥ 130/85 mmHg, abdominal obesity in 100%, hypertriglyceridemia in 33.3%, HDL-C less than 0.40 g/l in 62.5% of men and less than 0.50 g/l in 77.27% of men, blood sugar ≥ 1 g/l in 88.3%. Conclusion: The metabolic syndrome, in view of the entities that compose it, is a real cardiovascular risk factor and therefore a major public health issue.

Epidemio-Clinical and Uretrocystographic Profile of Pathologies of the Lower Urinary Tract at the Chu Pr Bss of Kati

Introduction: Pathologies of the lower urinary tract are common in urology composed of various conditions, responsible for urinary disorders. Despite the new methods, exploration in Africa is mainly based on retrograde urethrocystography (UCR). The main objective was to determine the importance of UCR in the diagnosis of pathologies of the lower urinary tract. Materials and Methods: This was a retrospective and descriptive study covering a period of 5 years (July 2016-June 2021). It involved all patients admitted to the ward for retrograde urethrocystography during the period. A remote-controlled table of the GE PRESTILIX 1600× type was used for the examinations. Results: At the end of our study we collected 100 cases of pathologies of the lower urinary tract out of a total of 112 RCUs performed or 89.28%. Pathologies of the lower urinary tract accounted for 78% of the UCRs in the department. The age group of (61 - 70) was the most affected with extremes from 1 year to 101 years. Non-specific urination disorders were the most common indications (43%), followed by acute urine retention (18%). Acquired urethral pathology was the most common (89%), followed by bladder neck disease 5% and posterior urethral valve with 4%, Bladder struggle was the most common associated sign (54%) with post-urination residue in 97% of patients. Conclusion: Pathologies of the lower urinary tract are relatively common in our region, dominated by urethral narrowings. Retrograde urethrocystography remains the reference examination in our control for the diagnosis of obstructive pathologies of the lower urinary tract while specifying the seat of the obstacle.

Chu空间下的粗糙集与证据理论结合进行内燃机诊断

证据理论是处理不确定性问题的有效工具,但其依赖专家知识提供证据,并要求各证据体相互独立,致使实际应用困难。借助粗糙集理论,剔除冗余成分,应可克服证据获取主观性和证据体相关性的缺陷。Chu空间理论提供了一种通用的代数框架,是用于诊断信息融合的一种新方法;针对此问题,研究了Chu空间表达下的粗糙集与证据理论可集成性,并提出了基于二者集成的故障诊断推理策略。柴油机的实际诊断结果验证了将粗糙集与证据理论相结合进行故障诊断的良好效果。

产虾青素菌株CHU-R的鉴定及其培养条件优化

【目的】对产虾青素菌株CHU-R进行鉴定,并对其培养条件进行优化,为虾青素的规模化生产奠定基础。【方法】对产虾青素菌株CHU-R进行形态、生理生化及16SrDNA序列鉴定;以菌株CHU-R菌体生物量和虾青素产量为考察指标,对CHU-R菌株的碳源、氮源、微量元素等培养基成分及温度、初始pH值、接种量、装液量、蔗糖含量等培养条件进行优化,并对优化条件进行正交试验,确定最佳的培养基组分。【结果】CHU-R为乳杆菌。CHU-R菌株培养基中的适宜氮源为铵盐和尿素;碳源为蔗糖和葡萄糖;培养基中缺少Fe2+不利于菌体生长和虾青素积累。CHU-R的适宜培养条件为:接种量≤50mL/L,装液量50mL/L,初始pH值7.0～7.5,发酵温度26～30℃,发酵时间48～72h,在此条件下,菌株CHU-R菌体生物量和虾青素产量均较高。【结论】乳杆菌CHU-R在优化培养条件下能够得到产量较高的虾青素,具有较好的应用潜力和经济价值。

TD-LTE系统中Zadoff-Chu序列的研究与DSP实现

通过对Zadoff-Chu(ZC)序列生成算法的分析及理论推导,提出了一种快速、有效的Zadoff-Chu序列生成的DSP实现方案。该方案已经在TMS320C64xDSP中实现。通过在CCS3.3中运行程序,验证了方案的可行性和高效性。该方案在LTE-TDD无线综合测试仪表的开发中已经得到应用。

CHU-R菌株虾青素稳定性及抗氧化活性研究

通过对CHU-R虾青素稳定性进行测定,表明虾青素对短时受热有较好的稳定性,对光和氧非常敏感;有机溶剂中极性最小的石油醚有利于虾青素的保存,而极性最大的丙酮则十分不利于色素的保存,色拉油能很好的保护色素,因其较好地隔离了空气中的氧,起到了一定的屏蔽作用。采用ORAC分析法对CHU-R虾青素进行抗氧化活性测定,结果表明CHU-R虾青素具有良好的抗氧化能力,平均抗氧化活性为13.80U/mg,且其抗氧化能力与浓度成正相关,通过CHU-R色素对鱼藤酮的光保护实验得出,CHU-R虾青素对鱼藤酮具有良好的保护性能。

Zadoff-Chu序列的内插算法

脉冲压缩体制斜向短波信道探测主要利用Zadoff-Chu序列良好的周期自相关特性进行相关检测。为使Zadoff-Chu序列的频谱特性与信道探测收发信机的要求相匹配,提出一种适合Zadoff-Chu序列的FDI内插算法,以改善其频谱特性,并与一般内插算法内插后的序列频谱进行比较。仿真结果表明:采用FDI内插算法插值后序列的频谱滚降更快,且几乎没有旁瓣,能量十分集中,确认了FDI内插算法的优越性;在接收端,通过理论推导给出了一种实现采用FDI算法内插后的序列最佳抽取的方法。计算和仿真结果验证了该方法的有效性。