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Environmental status and management in Chiba Prefecture
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作者 Kiyoshi TSUCHIYA 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1990年第2期87-98,共12页
Chiba Prefecture is located in the east of Tokyo Metropolis. A large scale development of industrial and residential areas began in the late 1950s until then the main industries of the prefecture were agriculture and ... Chiba Prefecture is located in the east of Tokyo Metropolis. A large scale development of industrial and residential areas began in the late 1950s until then the main industries of the prefecture were agriculture and fisheries. During the past 30 years rapid industrialization and urbanization took place resulting in occurrence of various environmental problems.In an attempt to establish a better environment condition towards 21st century Chiba Prefecture has made Environmental Plan which all the municipal governments, enterprises and inhabitants should observe to realize better environment. 展开更多
关键词 environmental status environmental management Chiba Prefecture Japan.
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Need for education of psychiatric evaluation of offenders with mental disorders:A questionnaire survey for Japanese designated psychiatrists
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作者 Akihiro Shiina Tomihisa Niitsu +1 位作者 Masaomi Iyo Chiyo Fujii 《World Journal of Psychiatry》 SCIE 2024年第5期726-734,共9页
BACKGROUND The management of offenders with mental disorders has been a significant concern in forensic psychiatry.In Japan,the introduction of the Medical Treatment and Supervision Act in 2005 addressed the issue.How... BACKGROUND The management of offenders with mental disorders has been a significant concern in forensic psychiatry.In Japan,the introduction of the Medical Treatment and Supervision Act in 2005 addressed the issue.However,numerous psychiatric patients at risk of violence still find themselves subject to the administrative involuntary hospitalization(AIH)scheme,which lacks clarity and updated standards.AIM To explore current as well as optimized learning strategies for risk assessment in AIH decision making.METHODS We conducted a questionnaire survey among designated psychiatrists to explore their experiences and expectations regarding training methods for psychiatric assessments of offenders with mental disorders.RESULTS The findings of this study’s survey suggest a prevalent reliance on traditional learning approaches such as oral education and on-the-job training.CONCLUSION This underscores the pressing need for structured training protocols in AIH consultations.Moreover,feedback derived from inpatient treatment experiences is identified as a crucial element for enhancing risk assessment skills. 展开更多
关键词 Forensic psychiatry Administrative involuntary hospitalization Psychiatric assessment Risk assessment Mental disorders Training protocols Clinical practice Structured learning Feedback mechanisms Program development
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Natural history of asymptomatic gallbladder stones in clinic without beds:A long-term prognosis over 10 years
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作者 Yuji Sakai Toshio Tsuyuguchi +5 位作者 Hiroshi Ohyama Junichiro Kumagai Takashi Kaiho Masayuki Ohtsuka Naoya Kato Tadao Sakai 《World Journal of Clinical Cases》 SCIE 2024年第1期42-50,共9页
BACKGROUND Several studies have explored the long-term prognosis of patients with asymp-tomatic gallbladder stones.These reports were primarily conducted in facilities equipped with beds for addressing symptomatic cas... BACKGROUND Several studies have explored the long-term prognosis of patients with asymp-tomatic gallbladder stones.These reports were primarily conducted in facilities equipped with beds for addressing symptomatic cases.AIM To report the long-term prognosis of patients with asymptomatic gallbladder stones in clinics without bed facilities.METHODS We investigated the prognoses of 237 patients diagnosed with asymptomatic gallbladder stones in clinics without beds between March 2010 and October 2022.When symptoms developed,patients were transferred to hospitals where appropriate treatment was possible.We investigated the asymptomatic and survival periods during the follow-up.RESULTS Among the 237 patients,214(90.3%)remained asymptomatic,with a mean asymptomatic period of 3898.9279±46.871 d(50-4111 d,10.7 years on average).Biliary complications developed in 23 patients(9.7%),with a mean survival period of 4010.0285±31.2788 d(53-4112 d,10.9 years on average).No patient died of biliary complications.CONCLUSION The long-term prognosis of asymptomatic gallbladder stones in clinics without beds was favorable.When the condition became symptomatic,the patients were transferred to hospitals with beds that could address it;thus,no deaths related to biliary complications were reported.This finding suggests that follow-up care in clinics without beds is possible. 展开更多
关键词 Gallbladder stone Acute cholangitis Acute cholecystitis Asymptomatic gallbladder stone Symptomatic gallbladder stone
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Aszonapyrone A Isolated from Neosartorya spinosa IFM 47025 Inhibits the NF-κB Signaling Pathway Activated by Expression of the Ependymoma-Causing Fusion Protein ZFTA-RELA
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作者 Kazuki Ishikawa Nao Kamiya +3 位作者 Masaki Ishii Takashi Yaguchi Koji Ichinose Shinya Ohata 《Advances in Microbiology》 CAS 2024年第9期448-467,共20页
Ependymoma is a rare and chemotherapy-resistant brain tumor, which has resulted in a delay in the development of drugs to treat it. A subclass of supratentorial ependymomas (ST-EPN), designated ST-EPN-zinc finger-tran... Ependymoma is a rare and chemotherapy-resistant brain tumor, which has resulted in a delay in the development of drugs to treat it. A subclass of supratentorial ependymomas (ST-EPN), designated ST-EPN-zinc finger-translocation-associated (ZFTA, ST-EPN-ZFTA), exhibits the expression of a fusion protein comprising ZFTA and v-rel reticuloendotheliosis viral oncogene homolog A (RELA), an effector transcription factor of the nuclear factor-kappa B (NF-κB) pathway (ZFTA-RELA). The expression of ZFTA-RELA results in the hyperactivation of the oncogenic NF-κB signaling pathway, which ultimately leads to the development of ST-EPN-ZFTA. To identify inhibitors of the NF-κB signaling pathway activated by the expression of ZFTA-RELA, we used a doxycycline-inducible ZFTA-RELA-expressing NF-κB reporter cell line and found that extracts of the fungus Neosartorya spinosa IFM 47025 exhibited NF-κB inhibitory activity. We identified eight compounds [aszonapyrone A (2), sartorypyrone A (3), epiheveadride (4), acetylaszonalenin (5), (R)-benzodiazepinedione (6), aszonalenin (7), sartorypyrone E (8) and (Z, Z)-N,N’-(1,2-bis[(4-methoxyphenyl)methylene]-1,2-ethanediyl)bis-formamide (9)] from N. spinosa IFM 47025 culture extract using a variety of chromatographic techniques. The structures of these compounds were identified through the analysis of various instrumental data (1D, 2D-NMR, MS, and optical rotation). The NF-κB responsive reporter assay indicated that compounds 2, 3, 5, 7, and 9 exhibited inhibitory activity. We further evaluated the inhibitory activity of these compounds against the expression of endogenous NF-κB responsive genes (CCND1, L1CAM, ICAM1, and TNF) and found that compound 2 showed significant inhibitory activity. Further studies are required to elucidate the mechanism of action of compound 2, which may serve as a lead compound for the development of a novel therapy for ST-EPN-ZFTA. 展开更多
关键词 Aszonapyrone A Neosartorya spinosa NF-κB Signaling Pathway EPENDYMOMA ZFTA-RELA
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Positive Effect of Transcranial Direct Current Stimulation on Visual Verbal Working Memory in Patients with Attention-Deficit/Hyperactivity Disorder
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作者 Tomoko Uchida Daisuke Matsuzawa +7 位作者 Tadashi Shiohama Katsunori Fujii Akihiro Shiina Masamitsu Naka Katsuo Sugita Eiji Shimizu Naoki Shimojo Hiromichi Hamada 《Open Journal of Psychiatry》 2024年第4期334-346,共13页
Background: Working memory is an executive function that plays an important role in many aspects of daily life, and its impairment in patients with attention-deficit/hyperactivity disorder (ADHD) affects quality of li... Background: Working memory is an executive function that plays an important role in many aspects of daily life, and its impairment in patients with attention-deficit/hyperactivity disorder (ADHD) affects quality of life. The dorsolateral prefrontal cortex (DLPFC) has been a good target site for transcranial direct current stimulation (tDCS) due to its intense involvement in working memory. In our 2018 study, tDCS improved visual-verbal working memory in healthy subjects. Objective: This study examines the effects of tDCS on ADHD patients, particularly on verbal working memory. Methods: We conducted an experiment involving verbal working memory of two modalities, visual and auditory, and a sustained attention task that could affect working memory in 9 ADHD patients. Active or sham tDCS was applied to the left DLPFC in a single-blind crossover design. Results: tDCS significantly improved the accuracy of visual-verbal working memory. In contrast, tDCS did not affect auditory-verbal working memory and sustained attention. Conclusion: tDCS to the left DLPFC improved visual-verbal working memory in ADHD patients, with important implications for potential ADHD treatments. 展开更多
关键词 Working Memory Attention-Deficit/Hyperactivity Disorder Dorsolateral Prefrontal Cortex Transcranial Direct Current Stimulation
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Electroencephalogram Signal Correlations between Default Mode Network and Attentional Functioning
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作者 Moemi Matsuo Takashi Higuchi +3 位作者 Toranosuke Abe Takuya Ishibashi Ayano Egashira Rio Kamashita 《Journal of Behavioral and Brain Science》 2024年第4期119-134,共16页
Attentional issues may affect acquiring new information, task performance, and learning. Cortical network activities change during different functional brain states, including the default mode network (DMN) and attent... Attentional issues may affect acquiring new information, task performance, and learning. Cortical network activities change during different functional brain states, including the default mode network (DMN) and attention network. We investigated the neural mechanisms underlying attentional functions and correlations between DMN connectivity and attentional function using the Trail-Making Test (TMT)-A and -B. Electroencephalography recordings were performed by placing 19 scalp electrodes per the 10 - 20 system. The mean power level was calculated for each rest and task condition. Non-parametric Spearman’s rank correlation was used to examine the correlation in power levels between the rest and TMT conditions. The most significant correlations during TMT-A were observed in the high gamma wave, followed by theta and beta waves, indicating that most correlations were in the parietal lobe, followed by the frontal, central, and temporal lobes. The most significant correlations during TMT-B were observed in the beta wave, followed by the high and low gamma waves, indicating that most correlations were in the temporal lobe, followed by the parietal, frontal, and central lobes. Frontoparietal beta and gamma waves in the DMN may represent attentional functions. 展开更多
关键词 Cortical Network Activities ELECTROENCEPHALOGRAPHY ATTENTION Default Mode Network
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Lithium Ion Transport Environment by Molecular Vibrations in Ion-Conducting Glasses
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作者 Hiroki Yamada Koji Ohara +20 位作者 Satoshi Hiroi Atsushi Sakuda Kazutaka lkeda Takahiro Ohkubo Kengo Nakada Hirofumi Tsukasaki Hiroshi Nakajimai Laszlo Temleitner Laszlo Pusztai Shunsuke Ariga Aoto Matsuo Jiong Ding Takumi Nakano Takuya Kimura Ryo Kobayashi Takeshi Usuki Shuta Tahara Koji Amezawa Yoshitaka Tateyama Shigeo Mori Akitoshi Hayashi 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第3期133-142,共10页
Controlling Li ion transport in glasses at atomic and molecular levels is key to realizing all-solid-state batteries,a promising technology for electric vehicles.In this context,Li_(3)PS_(4)glass,a promising solid ele... Controlling Li ion transport in glasses at atomic and molecular levels is key to realizing all-solid-state batteries,a promising technology for electric vehicles.In this context,Li_(3)PS_(4)glass,a promising solid electrolyte candidate,exhibits dynamic coupling between the Li^(+)cation mobility and the PS_(4)^(3-)anion libration,which is commonly referred to as the paddlewheel effect.In addition,it exhibits a concerted cation diffusion effect(i.e.,a cation-cation interaction),which is regarded as the essence of high Li ion transport.However,the correlation between the Li^(+)ions within the glass structure can only be vaguely determined,due to the limited experimental information that can be obtained.Here,this study reports that the Li ions present in glasses can be classified by evaluating their valence oscillations via Bader analysis to topologically analyze the chemical bonds.It is found that three types of Li ions are present in Li_(3)PS_(4)glass,and that the more mobile Li ions(i.e.,the Li3-type ions)exhibit a characteristic correlation at relatively long distances of 4.0-5.0A.Furthermore,reverse Monte Carlo simulations combined with deep learning potentials that reproduce X-ray,neutron,and electron diffraction pair distribution functions showed an increase in the number of Li3-type ions for partially crystallized glass structures with improved Li ion transport properties.Our results show order within the disorder of the Li ion distribution in the glass by a topological analysis of their valences.Thus,considering the molecular vibrations in the glass during the evaluation of the Li ion valences is expected to lead to the development of new solid electrolytes. 展开更多
关键词 electrolytes ionic conductors MODELING molecular dynamics
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SiCp/Al复合材料界面反应研究现状 被引量:30
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作者 王文明 潘复生 +2 位作者 孙旭炜 曾苏民 Lu Yun 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2004年第3期108-113,共6页
界面反应研究是碳化硅颗粒增强的铝基复合材料研发中的重要研究方向。各国研究者分别从界面反应规律、影响因素、控制途径等方面展开研究。界面反应规律方面研究了Al合金液与SiC颗粒可能存在的界面化学反应、界面反应过程和界面反应模... 界面反应研究是碳化硅颗粒增强的铝基复合材料研发中的重要研究方向。各国研究者分别从界面反应规律、影响因素、控制途径等方面展开研究。界面反应规律方面研究了Al合金液与SiC颗粒可能存在的界面化学反应、界面反应过程和界面反应模型、界面上的相等;界面反应影响因素方面研究了界面反应与制备工艺过程、参数的关系;界面反应有效控制途径方面研究了、基体合金化、SiC颗粒表面处理、工艺选择与工艺参数控制等。今后的界面反应研究方向为:界面精细结构的研究;界面反应的化学热力学及动力学研究等。 展开更多
关键词 碳化硅颗粒 铝基复合材料 界面反应 界面结构 化学热力学 SICP/AL复合材料
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汶川地震前的b值变化 被引量:50
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作者 史海霞 孟令媛 +5 位作者 张雪梅 常莹 杨振涛 谢蔚云 服部克巳 韩鹏 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2018年第5期1874-1882,共9页
Gutenberg-Richter定理给出了地震频度随震级的分布特征.大量研究表明频度-震级关系的斜率(b值)在大地震孕育的过程中会出现减小.为了考察b值在汶川地震孕育过程中的时间演化特征,本文尝试基于破裂断层选取研究区域,考察了2000年1月至2... Gutenberg-Richter定理给出了地震频度随震级的分布特征.大量研究表明频度-震级关系的斜率(b值)在大地震孕育的过程中会出现减小.为了考察b值在汶川地震孕育过程中的时间演化特征,本文尝试基于破裂断层选取研究区域,考察了2000年1月至2008年4月间,汶川地震(MS8.0)破裂区的地震活动性,并对该区域b值的变化进行了探讨.结果表明,在2005年中至2006年底,地震月频度及季度频度有一个较明显的下降.b值从2002年始至地震前呈现出一个长期趋势性减小;在地震前约半年,出现快速、显著的下降.b值的这一时间变化特征与其他研究者报道的日本东北MW9.0级地震前的b值变化特征具有很高相似性,可能反映了大地震准备过程中的应力变化.以上结果有益于认识和理解大地震孕育演化过程,同时也表明b值在中长期地震灾害评估中具有潜在价值. 展开更多
关键词 汶川地震 B值 地震活动性 孕震区
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全球变暖对太行山植被生产力及土壤水分的影响 被引量:25
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作者 杨永辉 王智平 +2 位作者 佐仓保夫 唐常源 新藤静夫 《应用生态学报》 CAS CSCD 2002年第6期667-671,共5页
将相同的自然植被用Lysimeter从高海拔下移至低海拔 ,温度升高 2℃ ,同时设置平均降水、增加10 %降水、增加 2 0 %降水、减少 10 %降水和减少 2 0 %降水 5个降水处理 ,模拟全球变暖带来的温度升高和降水变化对植被生产力和土壤水分的影... 将相同的自然植被用Lysimeter从高海拔下移至低海拔 ,温度升高 2℃ ,同时设置平均降水、增加10 %降水、增加 2 0 %降水、减少 10 %降水和减少 2 0 %降水 5个降水处理 ,模拟全球变暖带来的温度升高和降水变化对植被生产力和土壤水分的影响 .两年的野外实验表明 ,温度升高造成生态适应性差的野古草(Arundineliahirta)生产力显著下降 ,致使整个测试群落生产力降低 ,低海拔实验点生产力显著低于高海拔实验点 ,温度升高对铁杆蒿 (Artemisiasacrorum)和黄背草 (Themedajaponica)的影响较小 .太行山区的植被对降水的变化反映敏感 ,降水增加使植被的生产力水平显著提高 ,其中降水增加 2 0 %的处理生产力比平均降水处理的生产力增加 2 2 % .增加降水处理的土壤含水量显著高于平均降水和降水减少的实验处理 .由于植被的减少 。 展开更多
关键词 全球变暖 太行山 植被生产力 土壤水分
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碳化硅颗粒增强铝基复合材料开发与应用的研究现状 被引量:74
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作者 王文明 潘复生 +1 位作者 Lu Yun 曾苏民 《兵器材料科学与工程》 CAS CSCD 2004年第3期61-67,共7页
从复合材料的制备工艺、微观组织与力学性能等方面综述了国内外碳化硅颗粒增强铝基复合材料开发与应用的研究现状,指出了开发与应用中存在的问题,并对今后的发展趋势作出了预测。
关键词 碳化硅颗粒 铝基复合材料 制备工艺 微观组织 力学性能
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颗粒增强铝基复合材料弹性模量的影响因素 被引量:8
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作者 王文明 潘复生 +1 位作者 Lu Yun 曾苏民 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2006年第7期64-68,共5页
以SiCp/6066A1复合材料为例,计算和分析了界面性能参数(界面/基体模量比、界面泊松比和界面体积含量)及细观结构参数(颗粒形状、排列方式和尺寸变化方式)对颗粒增强铝基复合材料弹性模量的影响.结果表明:组分性能与界面性能对... 以SiCp/6066A1复合材料为例,计算和分析了界面性能参数(界面/基体模量比、界面泊松比和界面体积含量)及细观结构参数(颗粒形状、排列方式和尺寸变化方式)对颗粒增强铝基复合材料弹性模量的影响.结果表明:组分性能与界面性能对复合材料的弹性模量影响显著,细观结构的影响不明显,在工程应用中可以忽略细观结构的影响.在保证复合材料延伸率的前提下,最有效增加复合材料弹性模量的途径是改善复合材料的界面结合情况.当界面模量为基体模量的20%~30%时即可获得满意的增强效果. 展开更多
关键词 颗粒增强铝基复合材料 弹性模量 界面性能 细观结构
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地理信息系统支持下Spot/vegetation NDVI影像的大尺度神经网络分类 被引量:6
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作者 巴雅尔 敖登高娃 +3 位作者 沈彦俊 朱林 Ryutar Toateishi 王一谋 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2005年第6期427-431,共5页
以内蒙古地区Spot/vegetation归一化植被指数(NDVI)影像为基本信息源,综合应用地理信息系统(G IS)技术进行了大尺度神经网络分类实验研究.建立多年份高分辨影像数据库,通过G IS软件集成与遥感影像目视解译方法,在全区范围选取了“纯净... 以内蒙古地区Spot/vegetation归一化植被指数(NDVI)影像为基本信息源,综合应用地理信息系统(G IS)技术进行了大尺度神经网络分类实验研究.建立多年份高分辨影像数据库,通过G IS软件集成与遥感影像目视解译方法,在全区范围选取了“纯净”样本数据,并辅助应用DTM数据和影像化多年气像观测数据,完成土地覆盖类型的BP人工神经网络分类.结果表明,G IS技术支持下,大面积区域尺度上spot/vegetation NDVI影像的BP神经网络分类可达到较高的分类精度. 展开更多
关键词 地理信息系统 spot/vegetation NDVI 人工神经网络 遥感影像分类
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搅拌铸造制备SiC_p/Al复合材料的研究现状 被引量:25
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作者 王文明 潘复生 +1 位作者 LU Yun 曾苏民 《轻合金加工技术》 CAS 2004年第4期1-5,35,共6页
综述了搅拌铸造制备SiCp/Al复合材料的研究现状,指出了搅拌铸造法存在的问题,对搅拌铸造法在制备SiCp/Al复合材料中的地位和发展前景作了预测。
关键词 SICP/AL复合材料 搅拌铸造 制备 碳化硅 研究现状 铝基复合材料
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布南色林治疗精神分裂症的临床应用中日专家建议 被引量:11
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作者 于欣 司天梅 +6 位作者 陆峥 石川 IYO Masaomi IWATA Nakao UENO Takefumi INADA Ken HORI Hikaru 《中国心理卫生杂志》 CSCD 北大核心 2021年第9期751-757,共7页
第二代(非典型)抗精神病药布南色林对多巴胺D_(2)、D_(3)受体和5-HT_(2A)受体均有较高亲和力,而对肾上腺素α_(1)、5-HT_(2c)、组胺H_(1)、毒蕈碱M_(1)和M_(3)等受体亲和力较低。多项短期和长期临床研究显示:该药对精神分裂症的阳性症... 第二代(非典型)抗精神病药布南色林对多巴胺D_(2)、D_(3)受体和5-HT_(2A)受体均有较高亲和力,而对肾上腺素α_(1)、5-HT_(2c)、组胺H_(1)、毒蕈碱M_(1)和M_(3)等受体亲和力较低。多项短期和长期临床研究显示:该药对精神分裂症的阳性症状、阴性症状均有较好疗效,并改善患者的部分认知症状和社会功能。本文在循证证据和多位中日专家临床用药经验基础上撰写,希望为临床精神科医生提供用药参考,帮助精神分裂症患者早日康复,回归社会。 展开更多
关键词 精神分裂症 布南色林 临床应用
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Val-Glu-Pro对原发性高血压大鼠的体内降压作用
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作者 鲁军 杨阳 +5 位作者 陈林 任迪峰 蔡木易 王建中 EGASHIRA Yukari TANOKURA Masaru 《生物化学与生物物理进展》 SCIE CAS CSCD 北大核心 2011年第4期353-360,共8页
Val-Glu-Pro(VEP)是从钝顶螺旋藻(Spirulina platensis)中发现的一种血管紧张素转化酶(ACE)抑制肽.以原发性高血压大鼠(SHR)为模型,检测单次口服和一周间口服VEP的降压效果,并通过Real-timePCR和酶联免疫吸附法(ELISA)探索其对肾素-血... Val-Glu-Pro(VEP)是从钝顶螺旋藻(Spirulina platensis)中发现的一种血管紧张素转化酶(ACE)抑制肽.以原发性高血压大鼠(SHR)为模型,检测单次口服和一周间口服VEP的降压效果,并通过Real-timePCR和酶联免疫吸附法(ELISA)探索其对肾素-血管紧张素系统(RAS)主要成分在SHR大鼠肾脏和血清中的表达调控作用.结果表明:口服VEP的最低有效降压剂量为5mg/kg,加大剂量后表现出剂量效应,最低加权收缩压(WSBP)出现在口服后6h,最低加权舒张压(WDBP)出现在口服后4 h.在一周间口服试验中,10 mg/kg VEP处理组的WSBP在第5日显著低于负对照组.此外,口服VEP显著下调了SHR大鼠肾脏中肾素(renin)、ACE、血管紧张素Ⅱ(AngⅡ)类型1受体(AT1)的mRNA表达,并上调AngⅡ类型2受体(AT2)的mRNA表达,说明VEP的降压效果可能与对RAS系统的抑制作用相关,在高血压的预防和治疗中具有潜在的应用前景. 展开更多
关键词 Val-Glu-Pro 肾素-血管紧张素系统 ACE抑制肽 降压作用 原发性高血压大鼠
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^(176,178)Os新低位激发态的识别
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作者 王华磊 张玉虎 +21 位作者 周小红 郭应祥 雷祥国 徐树威 谢元祥 郑勇 柳敏良 邢烨炳 谢成营 宋立涛 郭文涛 T.Hayakawa M.Oshima Y.Toh J.Katakura Y.Hatssukawa M.Matsuda N.Shinohara T.Ishii H.Kusakari M.Sugawara T.Komatsubara 《原子核物理评论》 CAS CSCD 北大核心 2006年第1期13-17,共5页
利用在束实验产生具有β+/EC衰变性质核素176,178Ir,分析了在束实验条件下获得的γ-γ符合数据,识别出了176Os的4条新能级和13条新γ跃迁、178Os的5条新能级和14条新γ跃迁。籍助氦喷嘴快速带传输系统,进一步对176Ir的β+/EC衰变进行了... 利用在束实验产生具有β+/EC衰变性质核素176,178Ir,分析了在束实验条件下获得的γ-γ符合数据,识别出了176Os的4条新能级和13条新γ跃迁、178Os的5条新能级和14条新γ跃迁。籍助氦喷嘴快速带传输系统,进一步对176Ir的β+/EC衰变进行了测量,在确认在束测量新γ射线的同时建议了176Ir的一个低自旋同核异能态。通过两准粒子耦合的半经验计算,建议了176,178Ir基态及同核异能态的组态。 展开更多
关键词 低位能级纲图 在束测量 半衰期
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双奇核^(172)Re高自旋态实验研究
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作者 张玉虎 王华磊 +13 位作者 周小红 柳敏良 M.Oshima Y.Toh M.Koizimi A.Osa A.Kimura Y.Hatsukawa T.Morikawa M.Nakamura M.Sugawara H.Kusakari T.Komatsubara K.Furuno 《原子核物理评论》 CAS CSCD 北大核心 2004年第4期320-323,共4页
利用149Sm(27Al,4nγ)172Re反应布居了形变双奇核172Re的高自旋态,用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量,首次建立了172Re由3个转动带构成的高自旋态能级纲图.研究和讨论了3个转动带的结构特征,基于已有的... 利用149Sm(27Al,4nγ)172Re反应布居了形变双奇核172Re的高自旋态,用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量,首次建立了172Re由3个转动带构成的高自旋态能级纲图.研究和讨论了3个转动带的结构特征,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11/2 νi13/2,πh9/2 νi13/2和 π1/2-[541] ν1/2-[521].发现前两个转动带在自旋小于18时其转动能级呈现反常的旋称劈裂. 展开更多
关键词 高自旋态 形变双奇核 转动带 核结构 旋称劈裂 准粒子组态 能级纲图 首次 实验研究 抑制
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胃容积及胃食道液体状态变化的电学特性研究
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作者 张全成 王岸新 +1 位作者 孙博 姚佳烽 《生物化学与生物物理进展》 SCIE CAS CSCD 北大核心 2023年第7期1716-1727,共12页
目的三维电阻抗成像(3D-EIT)结合二维电阻抗成像(2D-EIT)研究胃容积及胃食道液体状态变化的电学特性响应,旨在探究EIT技术应用于胃食道反流病监测的可能性。方法8名受试者被要求在实验前4 h禁食,保证实验开始时胃部处于排空状态,实验开... 目的三维电阻抗成像(3D-EIT)结合二维电阻抗成像(2D-EIT)研究胃容积及胃食道液体状态变化的电学特性响应,旨在探究EIT技术应用于胃食道反流病监测的可能性。方法8名受试者被要求在实验前4 h禁食,保证实验开始时胃部处于排空状态,实验开始后受试者被要求分两次喝下400 ml经口补水液,在摄入200 ml状态下和摄入400 ml状态下分别应用3D-EIT检测腹腔3D空间的电导率分布。为了定量说明不同状态下电学特性的变化,使用配对样本t检验分析3D-EIT重建3D图像的空间平均电导率(σˉ)。采用数值仿真工具,建立两种尺寸胃容积模型验证,实验结果中胃容积变化是引起受试者腹腔3D空间内电导率变化的原因,并研究胃腔被不同比例补水液填充状态下电学特性的变化趋势,应用2D-EIT数值仿真进行电导率分布图像重建。结果8名受试者腹腔3D-EIT实验中空间平均电导率σˉ的配对样本t检验结果表明,空间平均电导率从C200 ml状态下的σˉ200 ml=0.226增加到C400 ml状态下的σˉ400 ml=0.387(n=8,P<0.05)。因此,受试者腹腔胃部区域空间平均电导率随胃容积增加而显著增加。2D-EIT数值仿真结果表明,随着胃腔填充补水液比例的增加测量电压差(ΔV)逐渐减少,ΔV对胃腔填充补水液体积敏感。与小型胃容积模型相比,大型胃容积模型在胃腔填充补水液比例相同情况下平均电压差(-V)更小,-V对胃容积模型的尺寸敏感。在小型胃容积例中,σˉ随着胃腔填充补水液比例增加而增加,从填充25%的σˉA=-0.29增加到填充100%的σˉD=-0.41;在大胃容积例中,σˉ随着胃腔填充补水液比例增加而增加,从填充25%的σˉE=-1.85增加到填充100%的σˉH=-2.12。结论3D-EIT电阻抗成像技术能够通过图像直观的反映不同尺寸胃容积的电学特性差异,2D-EIT根据在不同胃容积尺寸模型中ΔV、-V和σˉ显示出相同的趋势得出结论,3D-EIT结合2D-EIT技术令人满意的监测了胃食道在不同胃容积中的液体状态变化。 展开更多
关键词 电阻抗成像 胃容积 胃腔液体状态 电学特性 胃食道反流病
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基于参考台的盲源分离法在抑制地磁场近场噪音中的应用研究 被引量:9
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作者 周媛媛 常莹 +6 位作者 陈浩 周勇 马永辉 谢成良 何展翔 服部克巳 韩鹏 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2019年第2期572-586,共15页
随着城市建设的不断发展,地磁场观测受到的人文干扰越来越严重.汽车、地铁、高铁等产生的近场噪音造成了地磁脉动等空间场源信号难以被精确观测,严重影响了地磁观测资料的实际使用价值.因此抑制这些近场噪音、提取空间场源信号具有科学... 随着城市建设的不断发展,地磁场观测受到的人文干扰越来越严重.汽车、地铁、高铁等产生的近场噪音造成了地磁脉动等空间场源信号难以被精确观测,严重影响了地磁观测资料的实际使用价值.因此抑制这些近场噪音、提取空间场源信号具有科学意义和应用价值.本研究将远场参考法和盲源信号分离法相结合,提出了一种能有效分离空间场源信号和近场噪音的方法.首先,基于仿真分析,我们准确分离了不同特征的源信号,阐明了此方法的有效性.然后,我们将该方法应用于日本千叶地区受电车干扰较为严重的实际磁场观测数据,并选用数据质量较高的KAK国际基准台作为远场参考,实现了地磁脉动和电车干扰信号的分离,并在此基础上对观测台站的近场噪音进行了抑制.这些结果表明基于参考台的盲源信号分离法在抑制近场噪音、提取地磁场信号中是有效的,可能在电磁法勘探中具有潜在的应用价值. 展开更多
关键词 盲源分离法 地磁场 近场噪音 参考台 降噪
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