mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Automorphism Group of a Class of Gradation Shifting Toroidal Lie Algebras

Let A = C[t_1~±1,..., t] be the ring of Laurent polynomials in commuting variables. As a generalization of the toroidal Lie algebra, the gradation shifting toroidal Lie algebra ζn(E1,..., En) is isomorphic to the corresponding (centerless) toroidal Lie algebra so(n, C) A of type B or D as a vector space, with the Lie bracket twisted by n fixed elements E1,..., En from A. In this paper, we study the automorphisms of the gradation shifting toroidal algebra ζ(t1,..., t,, 1) = so(n + 1,C) ? C[t_1±1,... t_n±1 ], which is proved to be closely related to a class of subgroups of GL(n, Z), called the linear groups over semilattices. We use the linear group over a special semilattice to determine the automorphism group of the gradation shifting toroidal algebra ζ(t1,..., t_n, 1), which extends our earlier work
串激电机在高速运转中转子"飞线"的分析与探讨

通过以上分析可知,控制好转子绕线环节是控制好"飞线"的关键环节所在,辅之其他几个不可忽略的环节.伴随今后新技术设备与新工艺的发展,我们将开展进一步的探索
6SD106E驱动器及其应用分析

在开关磁阻电动机控制系统中,功率开关管的安全可靠驱动是功率变换器必须解决的问题.IGBT(绝缘栅双极性晶体管)常用驱动模块有TLP250,M57962以及EXB841/840等,由于两电平开关磁阻电动机控制系统中需要驱动六个单元的IGBT,在实际应用中考虑到既要具有保护功能的驱动电路,同时考虑使用集成度高且占用空间小的驱动器,传统的驱动电路已经不能满足其使用要求,因此,本文选用作为高集成度IGBT专用驱动电路的SCALE 6SD106E驱动模块.SCALE驱动板系列采用ASIC设计,仅用15 V电源驱动,开关频率可大于100 kHz,且具有高可靠和长寿命特性,同时还具备IGBT过电流保护功能.但是,该模块在实际应用中还需要注意一些关键问题,因此,本文结合实际工程应用,对6SD106E模块在应用中的关键问题进行分析和探讨
Void damage evolution of LF6 aluminum alloy welded joints under external load and thermal cycling conditions

Based on the simulated aerospace thermal cycling tests, the effect of thermal cycle on the void damage evolution mechanism of LF6 aluminum alloy welded joint was investigated. The results show that micro-voids form around the second phase particles under the thermal cycling tests. The thermal stress coupled with external stress leads to dislocations pile-up around the particles, and when the dislocation density reaches a certain degree, the stress concentration will exceed the bonding strength at the interface between particles and matrix, resulting in the formation of micro-cracks. The numerical simulation is successfully implemented with the finite element to describe the void damage evolution of the welded joint under thermal cycling conditions
Dynamic phase-mining optimization in open-pit metal mines

Three important aspects of phase-mining must be optimized:the number of phases, the geometry and location of each phase-pit(including the ultimate pit), and the ore and waste quantities to be mined in each phase. A model is presented,in which a sequence of geologically optimum pits is first generated and then dynamically evaluated to simultaneously optimize the above three aspects, with the objective of maximizing the overall net present value. In this model, the dynamic nature of the problem is fully taken into account with respect to both time and space, and is robust in accommodating different pit wall slopes and different bench heights. The model is applied to a large deposit consisting of 2 044 224 blocks and proved to be both efficient and practical
中西医结合治疗SAPHO综合征1例

<正>SAPHO综合征(synovitis, acne, pustulosis, hyperostosis, osteitis syndrome)即滑膜炎,痤疮,脓疱疮,骨肥厚,骨炎综合征,是一种非常罕见的临床综合征.本病近20余年才被人们所逐渐认识,因其发病率很低,国外报道近百例,国内报道不足20例,鲜见中医诊治
超声诊断肝包虫病1例

患者男,66岁,主因"无明显诱因右上腹胀痛不适2个月"入院.血常规检查:白细胞6.7×109/L,嗜酸性粒细胞0.9×109/L.体格检查:腹部平软,未触及包块,无压痛及反跳痛.超声检查示:肝脏体积增大,肝右叶斜径约148mm,肝左叶前后径约86mm,肝内回声分布不均,于肝左叶内可见两个囊性占位性病变,大小分别约63mm×62mm,82mm×66mm,呈类圆形(图1).内部为车轮状分布的无回声,边界清晰,壁厚,肿块后方回声增强.肝内胆管扩张,呈平行管征.胆总管在可显示范围内未见明显异常,余段显示不清(图2).脾,胰,双肾未见明显异常.超声提示:肝左叶内囊性占位,性质待定,考虑:肝包虫,多发多子
超声诊断胰腺囊性淋巴管瘤1例

患者女,68岁.主因"胃区不适1年多"入院.腹部超声:肝脏增大,肝内胆管明显扩张,较宽处约0.9cm.肝外胆道囊状扩张,范围约8.4cm×3.1cm.胰头部可见5.5cm×5.2cm×4.6cm囊实混合性肿物,形态不规整,边界模糊,其内大部分呈囊性蜂窝状,最大囊腔直径约1.8cm.主胰管扩张,管径约0.42cm,胰体,尾部未见占位性病变.CDFI:肿瘤内未检出血流信号,周边可检出少许血流信号(图13).超声提示:胰头部囊实混合性肿物;②胆总管囊状扩张,胆总管囊肿术中见肿物位于胰头,大小约3cm×4cm,完整切除肿物,胆囊及胆总管.大体标本:胰头肿物切面呈蜂窝状,内含少量液体.镜下见扩张的淋巴
亚硒酸钠与顺铂联用体外抗人肺腺癌A549细胞作用

目的探讨亚硒酸钠,顺铂(Cisplatin,DDP)联用对体外培养的人肺腺癌A549细胞增值的抑制作用及其作用机制.方法将亚硒酸钠与DDP应用于A549 24 h后,用MTT法检测对细胞增殖的抑制作用效应;用FCM技术检测对细胞周期的影响;用HE染色技术观察细胞凋亡状态.结果 亚硒酸钠与DDP的联合效应值均大于1.15,二者之间有交互作用,P<0.01.DDP使A549细胞周期阻滞于S期,中高剂量组的亚硒酸钠使A549细胞周期阻滞于G0/G1期而发挥一定的抑瘤效应;二者联用后,中高联合剂量组的S期细胞分别由6.07%增至48.47%,由16.07%提高到30.57%,而G2/M期细胞则分别由17.12%降到8.23%,由14.86%降到5.30%.亚硒酸钠与顺铂联合组可见有胞核致密浓缩的细胞凋亡小体.结论在该实验条件下,亚硒酸钠与顺铂联用可显著增加对A549细胞增殖的抑制作用,通过将A549细胞周期阻滞于S期而发挥较强的抑瘤效应.二者之间存在较强的协同交互作用.诱导A549细胞凋亡及阻滞细胞周期进程可能是亚硒酸钠与DDP协同增效作用的机制
2,3,7,8-四氯二苯并-对-二噁英对鱼类功能基因表达的影响

二噁英类化学物质是多氯代二苯并-对-二噁英和多氯代二苯并呋喃的总称,共有200余种同系异构体.其中2,3,7,8-四氯二苯并-对-二噁英(2,3,7,8-tetrachlorodibenzo-p-dioxin,TCDD)毒性最强[1].二噁英是在冶金工业,杀虫剂生产,垃圾焚烧,造纸等过程中产生的微量或痕量污染物,广泛地存于水,土,大气中[1].二噁英在人和动物体内不产生代谢变化,而在食物链中累积,严重威胁机体健康[2].本文重点概述了TCDD对鱼类功能基因表达的影响,可帮助了解TCDD对水生生物的影响,对深入研究和控制TCDD污染,保护水生生态环境和水生生物具有重要意义
Effects of Different Types of Sludge on Soil Microbial Properties: A Field Experiment on Degraded Mediterranean Soils

The recycling of suitable organic wastes can enhance soil fertility via effects on soil physical, chemical and biological properties. To compare the effects of digested (DS), thermally dried (TDS) and composted dewatered (CDS) sewage sludge on soil microbiological properties, an experiment was conducted at field sites for more than one year (401 d) when applied to two Mediterranean degraded soils (loam and loamy sand soils). All three types of sewage sludge had a significant effect on measured parameters. In a short time, the plots of both loamy sand and loam soils amended with TDS showed the highest microbial basal respiration (loam soil: P < 0.01; loamy sand soil: P < 0.001) and carbon mineralization coefficient (loam soil: P < 0.01; loamy sand soil: P < 0.001). Furthermore, on loamy sand soil, the plots amended with TDS showed the highest microbial metabolic quotient (qCO_2) (P < 0.05). This study revealed that the addition of sludge caused transient non-equilibrium effects on almost all soil microbial properties. However, there were no differences one year later because the remaining organic carbon was stable and quite similar in all treatments. These results may have practical implications for the rehabilitation of degraded soils
Root Effect of Three Vegetation Types on Shoreline Stabilization of Chongming Island, Shanghai

Coastal erosion is currently a major problem along the southern coast of Chongming Island, Shanghai. To enhance the erosion protection ability of coastal shelterbelts, two woody tree species, Taxodium ascendens and Salix babylonica, were planted separately into Phragmites australis + Scirpus mariqueter communities in 2006. Two years later, we investigated whether either of these experiments reduced erosion and increased stability in the native herbaceous plant community. We also examined soil stability and root length density under T. ascendens added, S. babylonica added and native herbaceous vegetation conditions along an intertidal gradient from the soil surface to a depth of 40 cm in each experiment, thus to determine the capacity of T. ascendens and S. babylonica to contribute to shoreline stabilization. Topsoil under the native vegetation had greater stability at the middle and higher intertidal zones because its soil stability index and root length density were significantly higher than in the T. ascendens or S. babylonica planted communities. The effect of T. ascendens on soil stability was not generally better than that of the native vegetation. Only at the 20-30 cm soil depth of the middle intertidal zone and in the 10-20 cm layer of the higher intertidal zone the soil stability index and root length densities under the T. ascendens added condition were significantly higher (P < 0.05) than those of the native vegetation. The S. babylonica planted soil had greater stability in the deeper soil layer than the soil under either the native vegetation or the T. ascendens added condition, and its soil stability index and root length density were significant higher (P < 0.05) than those of other vegetation conditions at the 30-40 cm soil depth for the lower intertidal zone and at the 20-40 cm layer for middle and higher intertidal zones
湖南省56 546例尘肺病例发病接尘工龄分析

目的 探讨尘肺接尘工龄规律,为制定尘肺防治对策提供科学依据.方法将湖南省尘肺数据信息库中不同接尘时间、不同期别、不同种类尘肺的发病接尘工龄数据转换成Excel电子表进行处理,用方差分析进行统计.结果湖南省56 546例尘肺的平均发病接尘工龄为(17.80±8.62)年,发病接尘工龄10~年11 428例(20.21%)、15~年10 877例(19.24%)、20~年9342例(16.25%),其中 I期、Ⅱ期、Ⅲ期尘肺的平均发病接尘工龄分别为(18.67±8.58)、(16.74±8.52)、(14.22±7.93)年,矽肺、煤工尘肺、其他11种尘肺的平均发病接尘工龄分别是(16.15±8.67)、(18.37±7.79)、(22.55±8.97)年,且各期别尘肺之间、各种类尘肺之间的差异均有统计学意义(P<0.01).结论接尘工龄在10~25年间为尘肺病的高发期;尘肺的期别越高反而其发病接尘工龄越短;在各种尘肺中矽肺的平均发病工龄最短,其次是煤工尘肺.因此,应特别注重接尘在10年后以及高期别尘肺和矽肺的防治,以取得尘肺防治的最大效益
桥本脑病二例

讨论桥本脑病(Hashimoto,s encephalopathy,HE)是一种临床罕见病,国内仅有数例个案报道,最早于1966年由 Brain等~[1]报道1例40岁男性患者,主要表现为难以解释的复发性、可自行缓解的卒中样发作及昏迷,患者同时合并桥本氏甲状腺炎(Hashimoto§thyroditis,HT).其后,许多文献报道了多种中枢神经系统功能异常与HT的关系,并将这类疾病命名为HE.其发病机制尚不明确,多认为与自身免疫反应有关~[2]
联苯苄唑乳膏微生物限度检查方法

目的:建立联苯苄唑乳膏微生物限度检查方法.方法:采用常规法在稀释液中加入增溶剂和中和剂的方法来降低联苯苄唑乳膏的抑菌作用.结果:本方法符合中国药典 2005年版验证试验的基本要求.5株试验菌株中金黄色葡萄球菌和黑曲霉菌对联苯苄唑乳膏最敏感,可作为联苯苄唑乳膏微生物限度检查方法的质控菌株.结论:该方法可作为联苯苄唑乳膏的微生物限度检查方法
高效液相色谱法测定人血浆中硫酸头孢匹罗的浓度

目的:建立测定人血浆中硫酸头孢匹罗浓度的高效液相色谱方法.方法:采用100 uL 7%高氯酸沉淀200 tLL血浆样品蛋白,高速离心后取上清液20 liL选样分析.以 Kromasil C_(18)柱(4.6 mm×250 mm,5 μm)为分析柱,50 mmol ·L~(-1)磷酸二氢钠溶液乙腈(87:13)为流动相,流速为1.0 mL ·min~(-1),检测波长为270 nm,盐酸可乐定为内标物.结果:硫酸关孢匹罗在0.312~160.0 mg. L一1检测范围内呈良好线性关系(r=0.999 8),平均相对回收率为(102.0±1.2)%,平均绝对回收率为(75.1±1.3)%;日内差异≤3.3%,日间差异≤1.9%,稳定性良好.结论:该方法操作简便、灵敏、准确、稳定,适用于血浆硫酸头孢匹罗的测定
论规划环境影响评价的现状问题及建议对策

相比建设项目环境影响评价(以下简称环评),规划环评从决策,计划的源头来控制经济活动对周围环境的影响,更具整体性和前瞻性.从规划环评的内涵分析入手,比较了其与建设项目环评的优势性,概述了目前规划环评的工作流程和技术方法,以及国内外在这一领域的发展现状.重点对规划环评在中国推行过程中存在的问题进行了剖析,并针对性地提出了一些建议
天津市工业污染物排放特征及其成因的研究

基于1992--2008年天津环境经济数据,采用环境库兹涅茨曲线模型,建立了天津工业污染物排放与经济增长的科学评价模型,与典型的倒U型环境库兹涅茨曲线不同,天津工业污染物排放模型有三次函数模型和指数函数模型,目前工业废气排放量和工业固体废物产生量处于上升趋势,而工业废水中的COD,工业烟尘和工业粉尘排放量出现下降趋势.通过计算工业污染物排放及其影响因子之间的灰色关联度,定量剖析1992年后天津工业污染物排放的库兹涅茨曲线的成因.结果表明,天津市环境污染变化的主要影响因子包括工业总产值,国际贸易(外商直接投资),能源消费,城市发展,工业污染治理,环境科研投入以及排污费征收
制浆造纸业各工段节水减排技术研究

中国制浆造纸业近年来在节水减排方面取得了一定的进展,但相对于国际水平还有很大的差距,而且远没达到造纸行业取水定额指标.通过对我国制浆造纸业各个用水工段普遍使用的技术与国际先进技术进行了比较,为新建,改建和重组造纸工厂提供技术依据.结果表明,废纸浆比非木浆节约用水约100 m3/t,废水排放量减少约100 m3/t;化学热磨机械制浆比化学制浆少用水约100 m3/t,废水排放量可减少约100 m3/t;封闭洗涤比开式洗涤少用水至少50 m3/t,废水排水量减少至少54 m3/t;采用中浓技术比传统的低浓技术节约用水约30 m3/t,废水排放量减少约30 m3/t;制浆废水经处理后回用,可使用水量减少约60 m3/t,废水排放量减少约40 m3/t;造纸产生的白水通过膜分离技术处理后再回用到生产过程中,可减少新鲜水用量约150 m3/t,减少废水排放量约120 m3/t.由此可知,采用先进技术,不仅降低了取水压力,降低取水成本,而且减少了废水的排放,减少了排污费,能取得显著的经济和环境双重效益
异步电动机矢量控制(三)

实现矢量控制需要知道磁链矢量ψ的幅值ψ及瞬时空间位置角ψ_s(矢量ψ与R相定子绕组的轴线间夹角), 本讲和下一讲介绍获取它们的方法----电动机模型. 电动机模型很多, 主要有电压模型VM和电流模型IM两大类. VM在中高速段精度高, 但在低速段不能正常工作, IM受转子电阻变化影响大, 中高速段的精度不如VM, 但在低速段能正常工作, 实际系统大多两种模型都用, 高速段按VM工作, 低速段按IM工作. 本讲介绍这两种模型, 下讲介绍它们的合成方法
山东省城市居民国家卫生城市知识及态度调查

中国1989年开始在全国范围内开展创建卫生城活动(1-2)?.全国已经有14个省?,治区的94个城市被命名为国家卫生城市,其中山东省就有17个?.建卫生城(创卫)的初衷是改善城市环境?,升城市形象?,强群众卫生意识(3)?,养文明生活方式?.了解山东省城市居民国家卫生城市知识及态度现状,为下一步创建卫生城工作提出科学的对策和措施提供依据,于2009年6月对山东省15个城市的居民进行了调查?.对象与方法1·1对象采用多阶段整群分层随机抽样方法选取样本?.先随机抽取5个地级国家卫生城市莱芜?,坊?,岛?,城?,营市,5个县级国家卫生城市莱州?,州?,莱?,光?,远市和5个非国家卫生城市莱阳?,南
师范大学新生心理健康状况调查

教师被誉为人类灵魂的工程师,师范生作为未来的老师,其心理健康水平可能对下一代的成长产生影响?.解师范大学新生的心理健康状况,针对普遍存在的心理问题进行有针对性地教育干预,既可以增强师范生的心理素质,又有利于提高高师院校人才培养的质量?.此,于2008年10月对吉林省某师范大学3234名新生进行心理健康水平调查?.果报告如下?.对象与方法1·1对象吉林省某师范大学2008级新生,共3 234人?.中男生871人,女生2 363人;文科生2 179人,理科生1 055人?.龄为1424岁,平均年龄(19·17±1·16)岁?.·2方法采用精神症状自评量表(SCL-90)进行测试(1)?.表包括9
二氧化氯改进与经典五步碘量法测定比较

2003年前,二氧化氯含量测定一直采用2000年版消毒技术规范规定的丙二酸法,测定结果不精确,并且不能区分溶液中的其他成分?.003年以后规定采用2002年版消毒技术规范所提供的五步碘量法?.实际应用中发现,该方法所提供的磷酸盐缓冲液pH值在6.90左右,根据该方法的取样量和缓冲液的量检测二氧化氯含量时重复性较差,测定结果难以反映真实含量?.研究采用经典五步碘量法和改良五步碘量法对2种消毒剂中的二氧化氯含量进行了实验室检测比较分析?.果报告如下?.材料与方法1.1材料磷酸二氢钾?,酸氢二钠?,化钾?,酸?,代硫酸钠?,氧化钠等均为分析纯试剂?..2二氧化氯消毒剂消毒剂a(山东山大华特科技股份有
Modeling and Analysis of Novel Integrated Radial Hybrid Magnetic Bearing for Magnetic Bearing Reaction Wheel

Conventional ball bearing reaction wheel used to control the attitude of spacecraft can't absorb the centrifugal force caused by imbalance of the wheel rotor, and there will be a torque spike at zero speed, which seriously influences the accuracy and stability of spacecraft attitude control. Compared with traditional ball-bearing wheel, noncontact and no lubrication are the remarkable features of the magnetic bearing reaction wheel, and which can solve the high precision problems of wheel. In general, two radial magnetic bearings are needed in magnetic bearing wheel, and the design results in a relatively large axial dimension and smaller momentum-to-mass ratios. In this paper, a new type of magnetic bearing reaction wheel(MBRW) is introduced for satellite attitude control, and a novel integrated radial hybrid magnetic bearing(RHMB) with permanent magnet bias is designed to reduce the mass and minimize the size of the MBRW, etc. The equivalent magnetic circuit model for the RHMB is presented and a solution is found. The stiffness model is also presented, including current stiffness, position negative stiffness, as well as tilting current stiffness, tilting angular position negative stiffness, force and moment equilibrium equations. The design parameters of the RHMB are given according to the requirement of the MBRW with angular momentum of 30 N · m · s when the rotation speed of rotor reaches to 5 kr/min. The nonlinearity of the RHMB is shown by using the characteristic curves of force-control current-position, current stiffness, position stiffness, moment-control current-angular displacement, tilting current stiffness and tilting angular position stiffness considering all the rotor position within the clearance space and the control current. The proposed research ensures the performance of the radial magnetic bearing with permanent magnet bias, and provides theory basis for design of the magnetic bearing wheel
Inlet Recirculation Influence to the Flow Structure of Centrifugal Impeller

Inlet recirculation is proved as an effective way for centrifugal compressor surge margin extension, and is successively used in some engineering applications. Unfortunately its working mechanism is still not being well understood, which leads to redesigning of inlet recirculation mostly by experience. Also, most study about inlet recirculation is steady to date. It is necessary to study surge margin extension mechanism about inlet recirculation. To expose the mechanism in detail, steady and unsteady numerical simulations were performed on a centrifugal compressor with and without inlet recirculation. The results showed that, with inlet recirculation, the inlet axial velocity is augmented, relative Mach number around blade tip leading edge area is significantly reduced and so is the flow angle. As the flow angle decreased, the incidence angle reduced which greatly improves the flow field inside the impeller. Moreover, inlet recirculation changes the blade loading around blade tip and restrains the flow separation on the blade suction side at the leading edge area. The unsteady results of static pressure around blade surface, entropy at inlet crossflow section and vorticity distributions at near tip span surface indicated that, at near stall condition, strong fluctuation exists in the vicinity of tip area due to the interaction between tip leakage flow and core flow. By inlet recirculation these strong flow fluctuations are eliminated so the flow stability is greatly enhanced. All these improvements mentioned above are the reason for inlet recirculation delays compressor stall. This research reveals the surge margin extension reason of inlet recirculation from an unsteady flow viewpoint and provides important reference for inlet recirculation structure design
Sequencing Mixed-model Production Systems by Modified Multi-objective Genetic Algorithms

As two independent problems, scheduling for parts fabrication line and sequencing for mixed-model assembly line have been addressed respectively by many researchers. However, these two problems should be considered simultaneously to improve the efficiency of the whole fabrication/assembly systems. By far, little research effort is devoted to sequencing problems for mixed-model fabrication/assembly systems. This paper is concerned about the sequencing problems in pull production systems which are composed of one mixed-model assembly line with limited intermediate buffers and two flexible parts fabrication flow lines with identical parallel machines and limited intermediate buffers. Two objectives are considered simultaneously: minimizing the total variation in parts consumption in the assembly line and minimizing the total makespan cost in the fabrication/assembly system. The integrated optimization framework, mathematical models and the method to construct the complete schedules for the fabrication lines according to the production sequences for the first stage in fabrication lines are presented. Since the above problems are non-deterministic polynomial-hard(NP-hard), a modified multi-objective genetic algorithm is proposed for solving the models, in which a method to generate the production sequences for the fabrication lines from the production sequences for the assembly line and a method to generate the initial population are put forward, new selection, crossover and mutation operators are designed, and Pareto ranking method and sharing function method are employed to evaluate the individuals' fitness. The feasibility and efficiency of the multi-objective genetic algorithm is shown by computational comparison with a multi-objective simulated annealing algorithm. The sequencing problems for mixed-model production systems can be solved effectively by the proposed modified multi-objective genetic algorithm
理性看待科学的数学化

<正>纵观科学发展史,可以看出科学发展的过程往往伴随着科学的数学化过程.数学化对自然科学发展有着不可磨灭的作用,对社会科学发展也具有重要影响.科学的数学化问题,也引起了数学界,科学界,哲学界,社会科学界的广泛重视.科学数学化问题涉及到自然科学,社会科学,人文科学,哲学,数学及其间相互关系的再认识,对这个问题的研究,有助于增加对人类科学知识体系的总体把握,也有助于揭示自然界与人类社会发展的共同规律,而对共同性的认识也是对差异性认识的前提和条件.但在强调科学的数学化的作用和趋势时,应注意考虑是否一切科学都能数学化?对这一点,学界目前尚未形成统一认识,缺乏对科学数学化的判定依据,本文对此做一初步探讨
运动与能量消耗和底物代谢特征研究进展

<正>与体育锻炼和生活方式密切相关的能量代谢异常是影响健康的主要因素之一,而科学的有规律的体育锻炼对促进和改善机体能量代谢状况有重要作用.现从运动强度,运动方式,以及运动者的性别,年龄,肥胖程度和身体机能水平等方面对运动能量消耗和底物代谢特征加以总结,以期对今后的研究和实践有所帮助
长江流域3个克氏原螯虾野生群体遗传结构的微卫星分析

克氏原螯虾(Procam barus clarkii)原产于北美洲,自引入中国以来,由于适应性广及缺乏天敌,自然种群发展迅速,很快遍布整个长江流域,并逐渐归化于中国自然水体,甚至在有些湖泊已成为优势种.该虾味道鲜美,营养丰富,近年来已成为池塘养殖的特种经济水产品之一.随着分布地域及养殖规模的逐步扩大,在基因水平上研究克氏原螯虾野生群体的遗传变异及群体间的遗传关系对防止群体退化,保持高效,稳定生产十分必要.迄今为止,国外已经在同工酶,线粒体DNA,RAPD水平上对克氏原螯虾遗传结构与遗传多样性进行了研究[1-3],但国内相关研究仍处于空白阶段.微卫星标记具有中性,量大,共显性等优势,与其他标记相
胰胆逆流在胆囊癌早期诊断中的意义

胰胆逆流指因胰胆管合流部解剖或功能上的异常,引起胰液长期、反复流人胆管的现象,其在胆囊癌的发生、发展过程中的作用愈来愈引起广大学者的注意.从本组患者结果来看,在胆囊癌和胆囊结石患者中胰胆逆流发生率分别为 66.7%和4.7%; 而胰胆合流异常发生率分别为31. 2%和 2. 3%,差异均有统计学意义.我们将胆汁中淀粉酶高于血清淀粉酶正常上限作为是否发生胰胆逆流的判别点,从本研究结果看,胆囊癌患者中胰胆逆流的发生率较胆囊结石患者高.而胆汁中淀粉酶的增高在胆囊癌的发生、发展过程中具有重要意义, Sugiyama等~[3]研究证实,溶血卵磷脂在胰胆逆流患者的胆囊癌形成过程中起重要作用: 胰液中的磷脂酶 A 2使胆汁中的卵磷脂水解产生溶血卵磷脂和脂肪酸,溶血卵磷脂有很强的细胞毒性作用,使胆管上皮发生增生或肠上皮化生,导致癌变; 尤其在没有胆总管扩张的患者中,由于胆囊作为胆汁的贮存器官同时变成了胰液淤滞的场所,导致胆囊癌的发生率明显增高. Yang等~[4]将胰胆逆流患者与健康人对比研究发现,前者增殖细胞核抗原阳性及溴脱氧脲苷呈
检测与识别农药飞行时间质谱(TOF)筛检时的非标靶不明污染物

飞行时间质谱(TOF)筛检常用于目标筛检活动,筛检时庞大的数据库被用于测定目标分析物的主要成分.在分析环境用水时,农药污染物筛检是其中一项最为重要的分析.然而,其它污染物,如兽药或人用药品及其代谢物,也可能出现与农药相似的超痕量水平,并对水生态系统造成同样的危害
水泥类型对生活垃圾焚烧飞灰固化效果的影响

生活垃圾焚烧飞灰属于危险废弃物,在对其进行最终处置前需经无害化处理.水泥固化所需的设备和操作要求简单,价格合理,国内外许多学者对生活垃圾焚烧飞灰的水泥固化处理进行了研究,但研究中普遍使用的是硅酸盐类水泥,铝酸盐水泥,硫铝酸盐水泥分别称为第二,第三系列水泥,它们的化学成分,水化化学都与硅酸盐水泥相差较大
Hydrothermal Synthesis, Crystal Structure and Photoluminescent Property of a Zinc(II) Complex with 2,2'-Diphenic Acid and 2,2'-Bipyridine Ligands

A new dinuclear complex [Zn(dpa)(bipy)(H20)]2(dpa = 2,2'-diphenic acid, bipy = 2,2'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence spectrum and single-crystal X-ray diffraction. The complex crystallizes in monoclinic, space group P21/c with a = 10.960(2), b = 9.4841(18), c = 20.599(4) A, β = 104.452(3)°, V = 2073.4(7) A~3, C_(48)H_(36)N_40_(10)Zn2, Mr= 959.55, Dc = 1.537 g/cm~3, μ(MoKa) = 1.225 mm~(-1,) F(000) = 984, Z = 2, the final R = 0.0364 and wR = 0.0843 for 2788 observed reflections(I > 2σ(I)). In the crystal structure, the zinc atom is five-coordinated with two carboxylate oxygen atoms from different dpas, one coordinated water molecule and two nitrogen atoms from bipy ligands, showing a slightly distorted triangular bipyramidal geometry. Furthermore, it exhibits a zero-dimensional network structure with a sixteen-membered ring and shows yellow photoluminescent property at room temperature
Synthesis, Structural Features and Evaluation of Antibacterial Activities of Two Schiff Bases Derived from 3,4-Dihydroxybenzhydrazide

A new Schiff base compound(I),(E)-N'-(2-hydroxy-3-methoxybenzylidene)-3,4dihydroxybenzohydrazide-ethanol-water(1/1/1), has been synthesized and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/n with a = 7.459(4), b = 18.316(10), c = 13.638(7) A, β = 101.585(9)°, V = 1825.2(17) A3, Z = 4, μ = 0.104 mm~(-1), Dc = 1.333 g/cm3, F(000) = 776, the final R = 0.0635 and wR = 0.1302 for 3216 observed reflections with I > 2σ(I). Another compound(II),(E)-N'(2,5-dimethoxybenzylidene)-3,4-dihydroxybenzohydrazide-ethanol-water(1/1/1), has been synthesized and reported before. The antibacterial activities of these two compounds against seven bacteria were first evaluated, and one compound showed considerable antibacterial activity against S. aureus
我国放射卫生防护标准体系介绍

全国放射卫生防护标准专业委员会自1983年成立至今已是第六届, 制定了一系列的放射卫生防护标准. 根据放射卫生防护标准的定义、范围、作用、特点等, 分析我国放射卫生防护标准现状、存在的问题和今后主攻方向, 经过第六届卫生部放射卫生防护标准专业委员会多次讨论和修改, 建立起了符合我国国情的、全面系统的、科学实用的放射卫生防护标准体系框架, 并形成了体系框架图, 为开展放射卫生监督执法、技术服务工作提供技术方面依据, 为政府有关部门制定和实施相关政策法规提供决策依据
食管癌精确放疗中靶区勾划与危及器官保护的研究现状

随着立体定向技术、三维适形放疗、调强放疗和影像引导放疗(IGRT)等技术的出现, 食管癌放疗的精确度不断提高, 但是局部未控和复发仍为治疗后失败的主要原因. 如何进行食管癌精确放疗靶区的勾划是合理放疗的保证, 同时也直接影响放疗的效果. 放射性肺损伤和放射性心脏损伤等是制约食管癌患者放疗后生活质量改善的主要不利因素. 如何在精确放疗中限定危及器官的受照射剂量成为学者们关注的热点问题. 据国际辐射单位与测量委员会(ICRU) 62号报告所定义大体肿瘤区(GTV)、临床靶区(CTV)、内靶区(ITV)、计划靶区(PTV)、危及器官(OAR)等概念~[1], 本文对如何进行食管癌靶区勾划与危及器官保护相关的热点问题及争议进行综述
A continuously stratified nonlinear model for internal solitary waves in the northern South China Sea

A continuously stratified nonlinear model is set up to study the impact of topographical character on the generation of internal solitary waves over a sill by tidal flow. One of the reasons why almost all of the generated internal solitary waves propagate westward in the northern South China Sea is explained. The model simulations describe the generation and propagation of internal waves well. When the strength of imposed barotropic tides and the water stratification stay unchanged, the steepness of the sill slope can control both(a)whether or not the waves induced over a sill by tidal flow are linear internal waves or nonlinear internal solitary waves, and(b)the amplitude of the internal solitary waves generated. If the steepness of the sill is asymmetric, the nonlinear internal solitary waves may be induced on the steeper side of the sill. These conclusions are supported by a numerical experiment with a monthly-mean stratification and an actual seafloor topography from the Luzon Strait
Response of upper ocean currents to typhoons at two ADCP moorings west of the Luzon Strait

We deployed two ADCP mooring systems west of the Luzon Strait in August 2008, and measured the upper ocean currents at high frequency. Two typhoons passed over the moorings during approximately one-month observation period. Using ADCP observations, satellite wind and heat flux measurements, and high-resolution model assimilation products,we studied the response of the upper ocean to typhoons. The first typhoon, Nuri, passed over one of the moorings, resulting in strong Ekman divergence and significant surface cooling. The cooling of surface water lagged the typhoon wind forcing about one day and lasted about five days. The second typhoon, Sinlaku, moved northward east of the Luzon Strait, and did not directly impact currents near the observation regions. Sinlaku increased anomalous surface water transport exchange across the Luzon Strait, which modulated the surface layer current of the Kuroshio
99Tcm-MIBI甲状腺显像在胺碘酮所致甲状腺毒症鉴别诊断中的价值

<正>胺碘酮是常用的抗心律失常药物,其不良反应之一是引起甲状腺毒症(amiodarone-induced thyrotoxicosis,AIT).临床上一般将AIT分为2类:1型由甲状腺细胞增生,功能亢进