缩短

On the basement of conventional direct fan-beam reconstruction, this paper gives a newly improved algorithm-"fast filtering-backprojection". This method utilizes the symmetrical circle geometry to sample projection data, and reconstructs image on the Polarcoordinate firstly, then translates this reconstructed image onto the cartesian coordinate system with two interpolating operations so that the computer can show the result image on the VGA screen. This algorithm rebates the calculating backprojection greatly, and shortens a few times of reconstructing time than same kinds of means. With the size of image enlarging, the reconstructing time abates with 2 exponent times. In addition, according to the idea of parallel-beam, we rearrange the fan-beams and reconstruct image using parallel-beam method fastly. The rearranging constraint condition is given here.

本文首先在传统的扇束直接重建方法的基础上，提出了一个改进的快速滤波反投影重建算法，它利用旋转采集投影数据的圆周对称的几何关系，先在极坐标系统内进行图象的重建，然后通过两次内插运算再将图象转换到计算机显示方式下的笛卡尔坐标系中去，该方法将以往的直接重建方法中的反投影时所需的运算大大降低，并将重建时间比同类方法缩短了几倍，而且随着重建图象的尺寸的增大，重建时间以2的指数次方倍相对缩短，并获得了较好质量的重建图象；另外，又根据平行束投影重建图象的思想，对扇形射束进行了重排，然后利用平行束重建图象的方法进行扇束的重建，并推导了&扇束重排重建图象&方法的约束条件。

Results The average age of the patients was raised, the advanced age and high risk patients increased, the therapy time from chest pain onset to emergency visit, from emergency visit to catheter lab and from catheter lab to the first balloon angioplasty shortened, and the use of drug-eluting stent, distal protective device,aspiration thrombectomy catheter, injection of glyceryl trinitrate and diltiazem to the coronary artery became more frequent during recent 6 years.

结果平均年龄增大、高龄及高危患者增多，治疗时间窗中各时间段（发病→急诊科→导管室→首次球囊扩张）均有缩短，其中导管室→首次球囊扩张时间缩短显著；药物支架、远端保护装置、血栓抽吸器、预防性冠状动脉联合注射防止无复流药物在近两年增长迅速，无血流发生率、主要心血管事件发生率及平均住院日显著下降，同时溶栓后介入治疗较直接介入治疗各种严重出血并发症无明显增加。

Testing results indicate the distance of indenters decreases with direction of crack initiation deviate from original vertica line, deviate angle increases with the distance of indenters decreases.

由实验得知，随刀头间距之缩短，裂缝之初裂方位，会偏离原垂直之贯切轴，偏离之角度随间距之缩短而增加，而裂衍路径朝朝侧向自由偏离之趋势而得以观察。

As entering the knowledge economy time, enterprises have to face the market fast changing, product life cycle reducing, the technology promotion speeding up, the product function becoming more complex day by day as well as the product development becoming more and more difficult, how to speed up the research and development, reduce the time before promoting the product to the market, expand the market share, promote the ability of technology innovation, then obtain the long-enduring developmented core-competence become each enterprise to have to face with a question.

知识经济时代企业面对市场的瞬息万变、产品生命周期的缩短，技术更新的速率加快，产品功能的日趋复杂以及产品开发难度的提升，如何加快产品的研发，缩短产品的上市时间，扩大市场占有率，提升企业技术创新的能力，从而获得可持续性发展的核心竞争力成为每个企业都必须面对和解决的问题。

Especially suitable for life, to general mineral to color black and sludge and repeat the operating environment, and high temperature to filter under the condition of life is more suitable.

特别适用于令一般矿物质寿命缩短、颜色变黑和容易产生油泥的重复合和高温的操作环境，以及令过滤器寿命缩短的情况下更为适合。

Those shorteners still provide a way for scam artists to spread malware through Twitter, since it doesn't block a malware site whose URL has been shortened.

网址缩短工具仍然为诈骗高手提供了通过Twitter传播恶意软件的途径，因为Twitter不会阻止链接地址被缩短的恶意网站。

The value of the hardness of mung bean decreased as the soaking time increased. On the other hand, the hydration rate constant of mung bean increased, but the equilibrium of the moisture content decreased. Higher temperature could be conducive to reaching an equilibrium of the moisture content and shorten soaking time. On the microstructure, observation soaking could promote mung bean seed coat to absorb water, that might make its spongy mesophyll swell and inner wrinkly structure more smooth . During soaking at 50℃ and 70℃ for two hours, the surface and palisade parenchyma of the mung bean seed coat cracked, and pectic substances of the middle lamella were loss. Because of this, soaking rate could raise and shorten the soaking time.

在硬度测试中，则呈下降趋势；在绿豆吸水特性方面，其吸水速率常数呈增加趋势，而水分平衡常数则呈下降趋势；浸渍温度之提升有助於达到浸渍平衡及缩短浸渍时间；配合绿豆微细构造之观察，种皮会因浸渍、吸水，种皮外表的多角形海绵组织会有膨大情形，内部皱摺状构造则渐趋平滑；在50℃、70℃浸渍二小时，绿豆种皮之表皮、栅状组织会有破裂，海绵组织及中胶层果胶会有流失情形，因而使绿豆之浸渍速度提升与缩短浸渍时间。

The effects and mechanism of GABAergic neurons, NOergic neurons, opioid peptide and cyclic adenosine monophosphate in the nucleus reticularis thalami on sleep-wakefulness cycle of rats and the effects and mechanism of the 5-HTergic nerve fibers project from the nucleus raphes dorsalis to RT on sleep-wakefulness cycle of rats were investigated with the methods of brain stereotaxic, nucleus spile, microinjection and polysomngraphy.1. The effects of GABAergic neurons in RT on sleep-wakefulness cycle of rats1.1 Microinjection of 3-mercaptopropionic acid (3-MP, a kind of glutamate decarboxylase inhibitor) into RT. On the day of microinjection, sleep only decreased a litter. On the second day, sleep marked decreased and wakefulness marked increased. On the third and fourth day, sleep and wakefulness stages resumed to normal.1.2 Microinjection of gamma-amino butyric acid (GABA 1.0μg) into RT enhanced sleep and reduced wakefulness compared with control; while microinjection of L-glutamate (L-Glu, 0.2μg) decreased sleep and increased wakefulness; microinjection of bicuculline (BIC, 1.0μg), a GABAA receptor antagonist, enhanced wakefulness and reduced sleep; microinjection of baclofen (BAC, 1.0μg), GABAB receptor agonist, had the same effects as GABA.2. The effects of NOergic neurons in RT on sleep-wakefulness cycle of rats2.1 Microinjection of L-arginine (L-Arg, 0.5μg) into RT decreased sleep compared with control, but there were on statistaical difference between L-Arg group and control; while microinjection of sodium nitroprusside (SNP, 0.2μg), a NO donor into RT, sleep marked decreased and wakefulness marked increased. Microinjection of nitric oxide synthase inhibitor, N-nitro-L-arginine (L-NNA, 2.0μg) into RT enhanced sleep and reduced wakefulness.2.2 After simultaneous microinjection of L-NNA (2.0μg) and SNP (0.2μg) into RT, SNP abolished the sleep-promoting effect of L-NNA compared with L-NNA group; after simultaneous microinjection of L-NNA (2.0μg) and L-Arg(0.5μg) into RT, we found that L-NNA could not blocked the wakefulness-promoting effect of L-Arg.3. The effects of opioid peptide in RT on sleep-wakefulness cycle of rats3.1 Microinjection of morphine sulfate (MOR, 1.0μg) into RT increased wakefulness and decreased sleep compared with control; while microinjection of naloxone hydrochloride (NAL, 1.0μg), the antagonist of opiate receptors, into RT, enhanced sleep and reduced wakefulness.3.2 After simultaneous microinjection of MOR (1.0μg) and NAL (1.0μg) into RT, the wakefulness-promoting effect of MOR and the sleep-promoting effect of NAL were not observed compared with control.4. The effects of cAMP in RT on sleep-wakefulness cycle of rats Microinjection of cAMP (1.0μg) into RT increased sleep and decreased wakefulness compared with control; microinjection of methylene blue (MB,1.0μg) into RT enhanced sleep and reduced wakefulness compared with control.5. The effects of the 5-HTergic nerve fibers project from DRN to RT on sleep-wakefulness cycle of rats5.1 When L-Glu (0.2μg) was microinjected into DRN and normal sodium (NS,1.0μg) was microinjected into bilateral RT. We found that sleep was decreased and wakefulness was increased compared with control; when L-Glu (0.2μg) was microinjected into DRN and methysergide (MS,1.0μg), a non-selective 5-HT antagonist, was microinjected into bilateral RT, We found that sleep was enhanced and wakefulness was reduced compared with L-Glu group.5.2 When p-chlorophenylalanine (PCPA, 10μg) was microinjected into DRN and NS (1.0μg) was microinjected into bilateral RT, We found that sleep was increased and wakefulness was decreased compared with control; microinjection of 5-hydroxytryptaphan (5-HTP, 1.0μg), which can convert to 5-HT by the enzyme tryptophane hydroxylase and enhance 5-HT into bilateral RT, could block the effect of microinjection of PCPA into DRN on sleep-wakefulness cycle.

本研究采用脑立体定位、核团插管、微量注射、多导睡眠描记等方法，研究丘脑网状核(nucleus reticularis thalami，RT)中γ-氨基丁酸(gamma-amino butyric acid ，GABA)能神经元、一氧化氮(nitrogen monoxidum，NO)能神经元、阿片肽类神经递质、环一磷酸腺苷(cyclic adenosine monophosphate，cAMP)及中缝背核(nucleus raphes dorsalis，DRN)至RT的5-羟色胺(5-hydroxytryptamine，5-HT)能神经纤维投射对大鼠睡眠-觉醒周期的影响及其作用机制。1 RT内GABA能神经元对大鼠睡眠-觉醒周期的影响1.1大鼠RT内微量注射GABA合成关键酶抑制剂3-巯基丙酸(3-MP，5μg)，注射当天睡眠时间略有减少，第二日睡眠时间显著减少，觉醒时间明显增多，第三、四日睡眠和觉醒时间逐渐恢复至正常。1.2大鼠RT内微量注射GABA受体激动剂GABA( 1.0μg)后，与生理盐水组比较，睡眠时间增加，觉醒时间减少；而RT内微量注射L-谷氨酸(glutamic acid， L-Glu， 0.2μg)后，睡眠时间减少，觉醒时间增加；RT内微量注射GABAA受体阻断剂荷包牡丹碱(bicuculline，BIC，1.0μg)后，睡眠时间减少，觉醒时间增加；RT内微量注射GABAB受体激动剂氯苯氨丁酸(baclofen，BAC，1.0μg)后，产生了与GABA相似的促睡眠效果。2 RT内NO能神经元对大鼠睡眠-觉醒周期的影响2.1大鼠RT内微量注射NO的前体L-精氨酸(L-Arg，0.5μg)后，与生理盐水组对比，睡眠时间略有减少，但无显著性意义；而RT内微量注射NO的供体硝普钠(Sodium Nitroprusside，SNP，0.2μg)后可明显增加觉醒时间，缩短睡眠时间；微量注射一氧化氮合酶抑制剂L-硝基精氨酸(L-arginine，L-NNA，2.0μg)后，引起睡眠时间增多，觉醒时间减少。2.2大鼠RT内同时微量注射L-NNA(2.0μg)和SNP(0.2μg)后与L-NNA组比较发现SNP逆转了L-NNA的促睡眠作用；RT内同时微量注射L-NNA(2.0μg)和L-Arg(0.5μg)后，与L-NNA(2.0μg)组比较发现L-Arg可以增加觉醒而缩短睡眠，其促觉醒作用未能被NOS的抑制剂L-NNA所逆转。3 RT内阿片肽对大鼠睡眠-觉醒周期的影响3.1大鼠RT内微量注射硫酸吗啡(morphine sulfate，MOR，1.0μg)后与生理盐水组对比，睡眠时间减少而觉醒时间增加； RT内微量注射阿片肽受体拮抗剂盐酸纳洛酮(naloxone hydrochloride，NAL，1.0μg)后与生理盐水组比较，睡眠时间增加而觉醒时间减少。3.2大鼠RT内同时微量注射MOR(1.0μg)和NAL(1.0μg)后，与生理盐水组对比，原有的MOR促觉醒效果和NAL的促睡眠效果都没有表现。4 RT内环一磷酸腺苷信使对大鼠睡眠-觉醒周期的影响大鼠RT内微量注射cAMP(1.0μg)后与NS(1.0μg)组比较，睡眠时间增多而觉醒时间减少；RT内微量注射亚甲蓝(methylene blue，MB，1.0μg)后，与NS组比较，睡眠时间增多而觉醒时间减少。5中缝背核投射到丘脑网状核的5-羟色胺能神经纤维对大鼠睡眠-觉醒周期的影响5.1大鼠DRN内微量注射L-Glu(0.2μg)，同时在双侧RT内微量注射NS (1.0μg)后，与对照组(DRN和双侧RT注射NS， 0.2μg)比较，睡眠时间减少，觉醒时间增多；大鼠DRN内微量注射L-Glu(0.2μg)，同时在双侧RT内微量注射二甲基麦角新碱(methysergide， MS， 1.0μg )后，与对照组(DRN注射L-Glu 0.2μg，双侧RT注射NS 1.0μg)比较，睡眠时间增多，觉醒时间减少。5.2大鼠DRN内微量注射对氯苯丙氨酸(p-chlorophenylalanine，PCPA，10μg)，同时在双侧RT内微量注射NS (1.0μg)后，与对照组(DRN和双侧RT注射NS， 1.0μg)比较，睡眠时间增多，觉醒时间减少；大鼠DRN内微量注射PCPA(10μg)，产生睡眠增多效应后，在双侧RT内微量注射5-羟色胺酸(5-hydroxytryptaphan ， 5-HTP， 1.0μg )后，与对照组(DRN注射PCPA 10μg，双侧RT注射NS 1.0μg)比较，睡眠时间减少，觉醒时间增多。

In the production of wood composites, the pressing process is the most important for both productivity and board quality. Steam-injection vacuum pressing provides the means to control the pressing environment of wood composites over an extended range.

在木质复合板生产中，热压是决定产品质量和产量的最重要的因素，缩短热压周期，可以明显提高经济效益，喷蒸热压技术不仅可以有效地缩短木质复合板的热压时间，提高生产效率，而且可以改善产品的某些物理、力学性能，所以有望成为木质复合板热压的一个重要发展方向。

The results reveal that under violet ray radiation, the gas sensitivity properties of CeO2 doped ZnO nanowires gas sensor have been increased 300% and 305% for 100 ppm density with CH4 and CO, the response time of CeO2 doped ZnO nanowires sensor have been cut down 3 s and 4 s respectively; the reversion time of CeO2 doped ZnO nanowires sensor have been cut down 2s and 4s respectively.

结果表明，在紫光激发下，CeO2掺杂ZnO纳米线气敏元件对甲烷和一氧化碳的灵敏度分别提高了300%和305%，对甲烷和一氧化碳的响应时间分别缩短了3s和4s；恢复时间分别缩短了2s和4s。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。