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Optimal Design of Surface Structure of a Magnetic Head

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Chinese Journal of Mechanical Engineering 2009年第5期22卷 651-657页

作者： WANG Yazhen NIU Rongjun HUANG Ping School of Mechanical andAutomotive Engineering South China University of Technology Guangzhou 510640 China Guangdong College of Industry and Commerce Guangzhou 510510 China

Currently, the surface structure of a magnetic head has been transferred from a positive to a negative model. In order to increase magnetic storage density and to decrease the flight height, the surface structure of a head needs to be optimized continually. In the present paper, the influence of surface structure of a negative magnetic head on its flight attitude is analyzed in brief by both theoretical analysis and numerical simulation. Firstly, based on theoretical analysis, one-dimensional model of optimal design is built whose results play an important role in guiding for the two-dimensional model. Secondly, to analyze the impacts of different slructures of negative pressure heads, the original head structure is divided into five zones; the impacts of different zones on both pressure distribution and load carrying capacity were detailed analyzed by numerical analysis. Thirdly, remain the leading-head structure of the negative head, and optimized tail-end structure can be gained by the regional planning strategy to control the gas film pressure distribution. With layout strategy, three kinds of structures of the head were designed. The results show that the tail-end structure impacts on the flight performances significantly and the middle boss plays a major role on positive pressure, while the bilateral bosses lying in either side play assistant regulating role. The structures of bilateral bosses have slightly impact on pressure distribution. The results also show that an optimum tail structure can meet the needs of a lower flight height and a larger magnetic storage density.

关键词： surface structure optimum design numerical analysis

Efficacy and safety of modified medium-chain triglyceride ketogenic diet in patients with drug-resistant epilepsy

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Acta Epileptologica 2024年第1期7卷 44-52页

作者： Hua Li Yao Wang Jing Guo Peiqi Zhang Zheng Xu Kai Peng Xiaoli Dong Liming Zhao Department of Neurology Guangdong Sanjiu Brain HospitalGuangzhou510510China

Background Medium-chain triglyceride ketogenic diet(MCTKD)is previously less commonly used in *** study was aimed to assess the efficacy and safety of the modified MCTKD in the treatment of drug-resistant epilepsy in Chinese *** Patients with drug-resistant epilepsy were enrolled to receive treatment with modified MCTKD in Guangdong Sanjiu Brain Hospital during December 2020 and September *** modified MCTKD contained fat that provided 50–70%of the total energy,as well as proteins and carbohydrates that provided 20–30%and 20%of energy,*** fat component was composed of 20–30%medium-chain triglycerides(MCTs)and 30–40%long-chain *** efficacy and safety of the diet were assessed at 1,3 and 6 *** A total of 123 patients aged 2.5 to 65 years,were included in this *** response rates at 1,3 and 6 months were 49.6%,43.1%,and 30.9%,*** seizure freedom rates at 1,3 and 6 months were 12.2%,10.6%,and 6.5%,*** retention rates at 1,3 and 6 months were 98.4%,65.0%and 33.3%*** effects occurred in 21.14%of patients,which were predominantly gastrointestinal symptoms such as abdominal pain,diarrhea,vomiting,and constipation,and most of them resolved after dietary adjustments.A total of 82 patients(66.7%)discontinued the treatment with the reason of refusing to eat(8.1%),poor efficacy(35.0%),poor compliance(4.9%),and inability to follow-up(9.8%).Only 4 patients(3.3%)withdrew the diet due to side *** The modified MCTKD with MCTs providing 20–30%of energy has a good safety in patients with drug-resistant epilepsy,but its effectiveness needs to be *** modifications of MCTKD with an optimal energy ratio are required to achieve a better efficacy and safety.

关键词： Medium-chain triglyceride ketogenic diet Ketogenic diet Drug-resistant epilepsy Efficacy Safety

51 CASES OF OCCIPITAL NEURALGIA TREATED WITH ACUPUNCTURE

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Journal of Traditional Chinese Medicine 1992年第3期12卷 180-181页

作者：谢忠伟 The 157th Hospital of PLA Guangzhou510510

Occipital neuralgia is a pain syndromedue to various injuries to the occipital *** paroxysmal pain is in the unilateraloccipital region behind the mastoid processand radiates to above the occiput,the earand vertex of ... 详细信息

关键词： neuralgia paroxysmal knife vertex behind needle injuries minutes sensation remaining

颞极起源的颞叶癫痫患者13例临床与电生理分析

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中华神经科杂志 2024年第12期57卷 1317-1325页

作者：庄君费凌霞李花李少春华刚陈俊喜郭强蔡美玲广东三九脑科医院癫痫内科广州510510 广东三九脑科医院癫痫外科广州510510

目的总结起源于颞极的颞叶癫痫患者的临床、电生理特点,并基于其立体脑电图(SEEG)及头颅正电子发射体层摄影-电子计算机体层扫描(PET-CT)结果进行脑网络分析。方法回顾性分析于2019年1月1日至2023年9月1日在广东三九脑科医院完成SEEG植... 详细信息

目的总结起源于颞极的颞叶癫痫患者的临床、电生理特点,并基于其立体脑电图(SEEG)及头颅正电子发射体层摄影-电子计算机体层扫描(PET-CT)结果进行脑网络分析。方法回顾性分析于2019年1月1日至2023年9月1日在广东三九脑科医院完成SEEG植入的颞叶癫痫患者,根据解剖-电-临床分析结果及其SEEG表现,筛选出其中起源于颞极的患者,回顾性总结其临床资料及头皮脑电图。同时基于SEEG及头颅PET-CT结果,分析致痫网络。结果共分析108例颞叶癫痫患者,其中13例(12%)致痫区位于颞极,包括男性8例,女性5例,发病年龄(11.6±7.8)岁。这13例患者均为药物难治性癫痫,6例认知功能正常,4例认知功能轻度异常,3例存在严重认知下降。13例患者共记录到59次发作,全面强直-阵挛发作(GTCS)出现率为42%(25/59)。患者发作期症状分为3种类型:第1种为过度运动,见于9例患者;第2种为复杂运动,见于2例患者;第3种为自动运动,见于2例患者。头颅磁共振成像(MRI)结果显示13例患者中9例病变侧颞极灰白质分界欠清晰,伴或不伴海马硬化;2例颞极占位,无海马硬化;2例MRI阴性。头颅PET-CT结果显示13例均有病变侧颞极低代谢,其中11例低代谢区同时累及颞叶内侧结构、后眶回、前扣带回及岛叶,另外2例合并同侧颞叶内侧结构低代谢。病理结果显示7例为颞极微皮质发育畸形;3例为局灶性皮质发育不良Ⅰ或Ⅱ型;2例为良性肿瘤。头皮脑电图:间歇期分为3种放电模式:双颞区,病变侧优势;双前头部,病变侧优势;病变侧半球性,颞区著。发作期头皮脑电图显示4种起始模式:病变侧半球性节律性棘-慢波、多棘-慢波;病变侧前头部节律性慢波;病变侧前头部低波幅快节律;弥漫性低波幅快节律,病变侧半球著。SEEG:13例患者植入电极(9±2)根,分为3种发作模式:第1种:颞极➝邻近颞叶新皮质➝后眶回、前扣带回及岛叶➝颞叶内侧结构;第2种:颞极➝海马旁回、颞叶底面➝前扣带回、后眶回及岛叶➝颞叶内侧结构;第3种:颞极➝颞叶内侧结构➝岛叶➝后眶回。结论起源于颞极的颞叶癫痫相对少见,癫痫发作以过度运动/复杂运动为主,自动运动相对少见,易继发GTCS,致痫网络分析示颞极起源后可向额叶及岛叶扩散,也可向颞叶内侧结构扩散,前者更常见。常见病因为颞极皮质发育不良及颞极良性肿瘤,多不伴海马硬化。

关键词：癫痫,颞叶脑电描记术电生理学脑网络

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原发性中枢神经系统T细胞淋巴瘤1例

中华神经科杂志 2022年第12期55卷 1396-1401页

作者：李波山常国洪伟平李海南林涛汪文胜王展航蔡林波广东三九脑科医院神经内一科广州510510 广东三九脑科医院肿瘤科广州510510 广东三九脑科医院病理科广州510510 广东三九脑科医院神经外二科广州510510 广东三九脑科医院影像科广州510510

原发性中枢神经系统T细胞淋巴瘤(PCNSTL)临床上罕见,因其临床症状、影像学没有特异性而病理形态不典型容易被延误诊断。文中报道1例45岁的男性患者,因视物重影3个月,左侧肢体麻木2个月,言语欠清1周入院。入院后影像学检查考虑淋巴瘤或... 详细信息

原发性中枢神经系统T细胞淋巴瘤(PCNSTL)临床上罕见,因其临床症状、影像学没有特异性而病理形态不典型容易被延误诊断。文中报道1例45岁的男性患者,因视物重影3个月,左侧肢体麻木2个月,言语欠清1周入院。入院后影像学检查考虑淋巴瘤或淋巴细胞增殖性病变可能性较大,行脑活组织检查病理镜下未见典型肿瘤细胞,考虑“淋巴瘤治疗后改变,与炎性疾病相鉴别”。1个月后患者病情进展,复查影像学显示病灶范围较前扩大,强化程度较前明显,仍考虑为淋巴瘤或淋巴细胞增殖性病变可能。为明确诊断进行二次活组织检查,病理镜下仍未见到典型肿瘤样淋巴细胞。最后进行基因重排,结果显示T细胞受体(TCR)基因重排β和γ链均有阳性突变。结合细胞形态、免疫表型及TCR基因重排结果,患者最终诊断为PCNSTL。文中就PCNSTL的临床症状、影像学特点、实验室检查、病理学特征、诊断及鉴别诊断进行文献复习,以提高临床医生对此类少见疾病的认识。

关键词：中枢神经系统肿瘤淋巴瘤,非霍奇金淋巴瘤,T细胞磁共振成像活组织检查病理学,临床

ALLOCATION DIFFERENCE ANALYSES OF WATER SUBSTANCES DURING TYPHOON LANDING PROCESSES

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Journal of Tropical Meteorology 2018年第3期24卷 300-313页

作者： LIU Ji-chen ZHONG Wei LIU Shuang LU Han-cheng Institutes of Meteorology and Oceanography National University of Defense Technology Nanjing 211101 China Unit No. 75839. People＇s Liberation Army Guangzhon 510510 China

Based on a successful simulation of Typhoon Haikui(2012) using WRF(Weather Research & Forecasting)model with the WSM6 microphysics scheme, a high-resolution model output is presented and analyzed in this study. To understand the cause of the average gridded rainfall stability and increases after Haikui's landfall, this research examines the fields of the physical terms as well as the vapor and condensate distributions and budgets, including their respective changes during the landing process. The environmental vapor supply following the typhoon landfall has no significant difference from that before the landfall. Although Haikui's secondary circulation weakens, this circulation is not conducive to typhoon rainfall stability or increases, although the amounts of the six kinds of water substances(vapor,cloud water, cloud ice, snow, rain, and graupel) increase in the outer region of the typhoon. This reallocation of water substances is essential to the maintenance of rainfall. The six kinds of water substances are classified as vapor, clouds(cloud water and ice) and precipitation(snow, rain, and graupel) to diagnose their budgets. This sorting reveals that the changes in the budgets of different kinds of water substances, caused by the reduced mixing ratios of snow and ice, the water consumption of clouds, and the transformation of graupel, induce increased concentrations of precipitation fallout,which occur closer to the ground after typhoon landfall. In addition, this pattern is an efficient way for Haikui's rainfall to remain stable after its landfall. Thus, the allocation and budget analyses of water substances are meaningful when forecasting the typhoon rainfall stability and increases after landfall.

关键词： typhoon rainfall microphysical model scheme allocation of water substances

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彩色多普勒能量图在肝小血管瘤诊断中的应用

中国超声医学杂志 1997年第3期 36-38页

作者：罗支农陈薏兰韦怀新林苏琼付玲王新玉李红艳解放军第157医院!510510 广州南方医院!510510

应用彩色多普勒能量图（CDPI）、彩色多普勒血流图（CDFI）结合脉冲多普勒观测26例（38个病灶）肝小血管瘤血流情况。结果显示：CDPI在病灶内彩色血流显示率、“静脉血流延伸”征及深呼吸病灶内“繁星闪炼”征检出率方面均高于CDFI。我... 详细信息

应用彩色多普勒能量图（CDPI）、彩色多普勒血流图（CDFI）结合脉冲多普勒观测26例（38个病灶）肝小血管瘤血流情况。结果显示：CDPI在病灶内彩色血流显示率、“静脉血流延伸”征及深呼吸病灶内“繁星闪炼”征检出率方面均高于CDFI。我们认为CDPI在肝小血管瘤诊断与鉴别诊断上有较大的应用价值。

关键词：彩色多普勒能量图肝小血管瘤

创业异质性及其与经济发展的关系——基于宏观视角的创业研究综述

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经济问题探索 2014年第3期 7-14,130页

作者：齐玮娜张耀辉暨南大学广州510510

一直以来,创业被认为是促进经济增长的重要机制,但大量针对发达国家的纵向研究以及不同国家间的比较研究发现,由于经济发展状态在一国不同时期及不同国家间的多样性以及创业活动本身的异质性,创业与经济发展之间并不是简单的线性关系。... 详细信息

一直以来,创业被认为是促进经济增长的重要机制,但大量针对发达国家的纵向研究以及不同国家间的比较研究发现,由于经济发展状态在一国不同时期及不同国家间的多样性以及创业活动本身的异质性,创业与经济发展之间并不是简单的线性关系。本文从发达国家、低收入国家和经济转型国家三个方面回顾和梳理了宏观视角下创业研究的相关文献,总结了创业对经济增长的作用机制,并在创业异质性的基础上探究了其与不同经济发展状态之间的关系,为公共政策的制定和实施提供理论基础,同时也为创业研究在经济学领域的进一步深入提供了指导和参考。

关键词：创业异质性经济增长经济发展经济转型

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广东贵屿土壤Cd、Hg潜在威胁评价

地质科技情报 2012年第1期31卷 95-99,109页

作者：罗杰温汉辉吴丽霞游远航欧阳春飞广东省工程勘察院广州510510 广东省地质调查院广州510510

通过表层土壤、深层土壤、水稻样品及水样的采取与分析,结果表明,水俣病的元凶Hg在广东省贵屿镇土壤中具有极高的富集系数,易在酸性条件下向有效形态转化的弱有机结合态Hg占全Hg的17.74%;痛痛病的元凶Cd在部分土壤中的含量已超过环境承... 详细信息

通过表层土壤、深层土壤、水稻样品及水样的采取与分析,结果表明,水俣病的元凶Hg在广东省贵屿镇土壤中具有极高的富集系数,易在酸性条件下向有效形态转化的弱有机结合态Hg占全Hg的17.74%;痛痛病的元凶Cd在部分土壤中的含量已超过环境承受的极限,且最易与生命体发生作用的水溶态Cd和离子交换态Cd占全Cd的比例高达16.2%。Hg、Cd的块金系数均大于70%,具明显的表层富集特征,与家电拆解作坊表层土壤重金属元素同源性较好,说明Cd、Hg的分布、富集受人类活动影响强烈,其对生态环境和居民健康存在极强的潜在威胁,在特定条件下有可能引发各类地方病。

关键词：镉汞家电拆解地方病