Selection of Surgical Approach and Clinical Significance of Lower Cervical Spine Injuries Guided by SLIC Scoring System

Objective: To explore the feasibility and clinical significance of surgical approach selection for cervical spine injury guided by SLIC scoring system. Methods: The clinical data of 75 patients with lower cervical injury surgery from January 2020 to November 2022 were retrospectively analyzed, including 48 males and 27 females. Age: 28 - 65 years old. Causes of injury: 39 cases of traffic accidents, 15 cases of ice and snow sports, 12 cases of falling from high places, 9 cases of heavy objects. There were 12 cases of C3-4, 33 cases of C4-5, 21 cases of C5-6, and 9 cases of C6-7. Time from injury to medical treatment: 4 h - 2 d. Cervical spine X-ray, MRI, MDCT examination and preoperative SLIC score were performed on admission. Anterior approach was performed by subtotal cervical vertebrae resection or discectomy, titanium Cage or cage supported bone grafting and anterior titanium plate fixation. Posterior approach was performed with cervical laminoplasty, lateral mass or pedicle screw fixation and fusion. The combined anterior-posterior operation was performed by the anterior methods+ posterior methods. The time from injury to surgery is 12 h to 3 d. The function before and after operation was evaluated by JOA efficacy evaluation criteria. The correlation between the three surgical approaches and postoperative efficacy and SLIC score was compared. SPSS 22.0 software was used for statistical analysis of the data. Results: In this group of 75 patients, 32 cases of anterior operation, 22 cases of posterior operation and 21 cases of combined operation were followed up for no less than 12 months. There was no significant difference in age, gender, injury cause, injury segment, time from injury to treatment, and time from injury to operation among the three surgical approaches, which were comparable. The SLIC scores of mild, moderate and severe injuries of anterior surgery, posterior surgery and combined anterior and posterior surgery, They were (5.26 ± 1.24, 5.86 ± 1.67, 8.25 ± 0.21), (5.57 ± 1.43, 5.99 ± 1.85, 9.00 ± 0.25), (0, 5.98 ± 0.33, 9.44 ± 0.34), respectively. By comparing the SLIC scores and JOA scores of anterior surgery and posterior surgery, there was no difference in SLIC scores and JOA scores between the two groups for mild and moderate injuries (P > 0.05). However, the JOA scores at 3 months, 6 months and 12 months after surgery were different from those before surgery, and the postoperative efficacy and JOA scores were significantly improved (P & lt;0.05), indicating that the two surgical methods had the same therapeutic effect, that is, anterior or posterior surgery could be used to treat mild or moderate injuries (P > 0.05). There were differences in SLIC scores among the three surgical approaches for severe injury (P 0.05). The postoperative efficacy and JOA score of combined anterior-posterior approach were significantly improved compared with those before operation (P Conclusion: SLIC score not only provides accurate judgment for conservative treatment or surgical treatment of cervical spine injury, but also provides evidence-based medical basis and reference value for the selection of surgical approach and surgical method. According to the SLIC score, the surgical approach is safe and feasible. When the SLIC score is 4 - 7, anterior surgery is selected for type A injury, and posterior surgery is selected for type B injury. When the SLIC score is ≥8, combined anterior-posterior surgery should be selected. It is of great significance for clinical formulation of precision treatment strategy.

Super-selective arterial embolization in the control of acute lower gastrointestinal hemorrhage

BACKGROUND Acute gastrointestinal bleeding is an emergency condition that can lead to significant morbidity and mortality.Embolization is considered the preferred therapy in the treatment of lower gastrointestinal bleeding when it is unrealistic to perform the surgery or vasopressin infusion in this population.Treatment of acute lower gastrointestinal(GI)bleeding(any site below the ligament of Treitz)using this technique has not reached a consensus,because of the belief that the risk of intestinal infarction in this condition is extremely high.The purpose of the study is to evaluate the effectiveness and safety of this technique in a retrospective group of patients who underwent embolization for acute lower GI bleeding.AIM To evaluate the efficacy and safety of super-selective arterial embolization in the management of acute lower GI bleeding.METHODS A series of 31 consecutive patients with angiographically demonstrated small intestinal or colonic bleeding was retrospectively reviewed.The success rate and complication rate of super-selective embolization were recorded.RESULTS Five out of thirty-one patients(16.1%)could not achieve sufficiently selective catheterization to permit embolization.Initial control of bleeding was achieved in 26 patients(100%),and relapsed GI bleeding occurred in 1 of them at 1 wk after the operation.No clinically apparent bowel infarctions were observed in patients undergoing embolization.CONCLUSION Super-selective embolization is a safe therapeutic method for acute lower GI bleeding,and it is suitable and effective for many patients suffering this disease.Importantly,careful technique and suitable embolic agent are essential to the successful operation.

Antenna selection in MIMO radar with collocated antennas

An antenna adjustment strategy is developed for the target tracking problem in the collocated multiple-input multipleoutput(MIMO)radar.The basic technique of this strategy is to optimally allocate antennas by the prior information in the tracking recursive period,with the objective of enhancing the worst-case estimate precision of multiple targets.On account of the posterior Cramer-Rao lower bound(PCRLB)offering a quantitative measure for target tracking accuracy,the PCRLB of joint direction-of-arrival(DOA)and Doppler is derived and utilized as the optimization criterion.It is shown that the dynamic antenna selection problem is NP-hard,and an efficient technique which combines convex relaxation with local search is put forward as the solution.Simulation results demonstrate the outperformance of the proposed strategy to the fixed antenna configuration and heuristic search algorithm.Moreover,it is able to offer close-to performance of the exhaustive search method.

Equilibria of the Abstract Economy under Almost Lower Semi-continuous Assumption

The purpose of this paper is to make a further study on the abstract economy. Here, for the constraint correspondences we assume that they are almost lower semi-continuous (n-lower semi-continuous), which is weaken than that they are lower semi-continuous. Several equilibria existence theorems are proved.

CRAMER-RAO BOUNDS OF THE FREQUENCY ESTIMATION IN THE TIME SELECTIVE RADIO CHANNELS WITH DOPPLER SPREAD

The mobile channel is slow fading and time selective, thus the multiplicative and additive noise of the channel will smear the spectral line, or arouse Doppler spread. This spread will make the parameters estimation accuracy degrade. The goal of this paper is to analytically assess this degradation when Carrier Frequency Offset (CFO) and Doppler shift exist jointly. Then the finite-sample Cramer-Rao Lower Bound (CRLB) is derived and close-form asymptotical expression is given for large-sample CRLB. These expressions give insights into the performance room for frequency estimation. Also the variance of Doppler shift estimator is simulated to illustrate the theoretical results.

Selective laser trabeculoplasty in pseudophakic and phakic eyes:a prospective study

AIM：To compare the efficacy of selective laser trabeculoplasty（SLT） in replacing medical therapy in pseudophakic and phakic eyes.METHODS：Subgroup of a prospective randomized clinical trial including patients with primary open angle glaucoma or ocular hypertension controlled with medication.Of 38 pseudophakic eyes were matched with 38 phakic eyes.SLT was offered as a way to decrease medication while maintaining the same low eye pressure.SLT was performed over 360°,at 3ns,spotsize 400 μm,100 spots.Data [intraocular pressure（IOP）,number of medications needed] were measured at 1h,1wk,1,3,6 and 12 mo.An independent-samples t-test was performed to compare baseline characteristics of the phakic and the pseudophakic group and differences in evolution of mean IOP and number of used medications.Chi-squared analysis was performed to investigate proportions of fast,slow and non-responders.RESULTS：The mean IOP measurement was 13.00± 2.88 mm Hg in the phakic group（38 eyes） and 13.51±3.06 mm Hg in the pseudophakic group（38 eyes）（P〉0.05）.This changed little after SLT and IOP lowering effect was comparable between the two groups.Main aim however was to lower the amount of medication needed.In the phakic group medication lowered from 1.29±0.62 at baseline,to 0.15±0.46 after 12mo;a reduction of 88.37%.In the pseudophakic group,used medication changed from 1.71±1.04,to 0.41±0.61;a 76.02% reduction.The differences were not statistically significant at any time point（P〉0.05）.IOP lowering occurred slightly faster in thepseudophakic group（50% of patients after one week） than in the phakic group（68% of patients after more than 4wk）.The difference was not significant（P〉0.05）.CONCLUSION：IOP lowering effect of SLT is comparable between phakic and pseudophakic eyes.

Occurrence modes of silver in the Ni-Mo-PGE polymetallic layer of the Lower Cambrian black shales in Zunyi, Guizhou Province, South China

The Ni-Mo-PGE polymetallic mineralization of the Lower Cambrian black shales locate in Zunyi, South China and contain abundant noble metals such as Ag, Au and PGE, and especially Ag with average concentration of 64×10-6. The occurrence modes of Ag have been investigated using methods of selective chemical dissolution and transmission electron microscopy. The results demonstrate that the occurrence modes of Ag are complex and diversiform. It might be associated with clay minerals, organic matter, sulfides and also occurred as native silver and sulfides with nanometer in size. Combined with results of previous studies, we suggest that the sulfides, clay minerals and organic matter which hosted in the Ni-Mo-PGE polymetallic ores of black shales can play the roles of important reduction and adsorption geochemical barriers for the enrichment and distribution of silver. This study further implies that the selective chemical dissolution and transmission electron microscopy may pave the way to study the occurrence modes of other noble metals in black shales.

固体激光器可靠性评估技术研究

主要介绍了在获得固体激光器的失效数据下,利用AIC、BIC信息量最小准则的分布类型选择方法,确定固体激光器的失效分布类型,再利用已有的数据,对其可靠性进行有效的评估,得到固体激光器MTBF的点估计和不同置信度下的MTBF置信下限,为该产品设计定型和生产决策提供管理信息。

基于组合模型的复杂系统超多目标优化算法

代理模型辅助进化算法广泛用于昂贵的复杂工程系统优化设计,能够加速找到问题的最优解集。然而,单个模型预测性能依赖于具体问题,并且随着目标个数的增加,预测性能的不确定性将随之增加。因此,提出一种基于组合模型的复杂系统超多目标优化算法。首先,建立组合代理模型并结合随机参考向量替代机制,以更好地搜索超多目标问题的非支配解集。其次,基于改进的统计下限最小值(LCB)准则及自适应个体选择策略选择优秀个体进行真实评估,以更新组合代理模型,使其能更好地辅助算法找到最优解集。最后,通过所提算法与已有代理模型进化算法在一系列测试函数和工程优化实例上的对比结果表明,所提算法具有良好的性能和潜力。

基于数据挖掘技术探讨针刺治疗卒中后下肢痉挛的选穴规律

【目的】基于数据挖掘技术探讨针刺治疗卒中后下肢痉挛的选穴规律。【方法】通过计算机检索中国知网期刊全文数据库(CNKI)、万方学术期刊全文数据库(Wanfang)、维普中文科技期刊全文数据库(VIP)、美国生物医学信息检索系统(PubMed)、荷兰医学文摘(EMbase)、科学网(Web of Science)等数据库,筛选符合纳入标准的文献建立数据库。通过Microsoft Excel 2016、IBM SPSS Statistics 21、IBM SPSS Modeler 18.0软件对数据进行描述性分析、聚类分析和关联规则分析。【结果】(1)共纳入68条针刺处方,涉及腧穴100个,总使用频次536次;(2)腧穴使用频次排前5位的分别是阳陵泉、足三里、悬钟、丘墟、三阴交;(3)核心腧穴配伍为阳陵泉-悬钟,并得到5个有效聚类群,分别为申脉-照海、委中-昆仑、血海-环跳-丰隆-足三里、太溪-阴陵泉-三阴交、解溪-太冲-悬钟-丘墟-阳陵泉。【结论】通过数据挖掘发现,针刺治疗卒中后下肢痉挛多以阳陵泉、足三里、悬钟、丘墟、悬钟为核心,优先考虑足三阳经、五输穴的应用,辨证论治、随证加减,可为临床治疗卒中后下肢痉挛提供参考依据。

二级垃圾回收中转设施选址问题的降阶回溯算法

随着我国城市化进程的加快和经济的高速发展,城市中因生产生活所产生的垃圾废料量日益增加,如何有效地建立回收中转设施是当前社会需要解决的问题。对二级垃圾回收设施选址问题进行研究,其实质为组合优化中的NP-hard问题。首先根据实际情况对二级垃圾回收中转设施选址问题进行数学建模,研究该问题的数学性质并给予证明,利用这些性质减小问题规模,降低求解难度;然后设计符合该问题的分配子算法、上下界子算法,基于以上算法提出一种可以在减小问题规模的同时得到精确解的降阶回溯算法;最后通过分析和模拟若干个示例进一步阐述该算法的原理及执行过程,结果表明该算法能通过减小问题规模,降低问题求解的难度。

汉江下游流域生态流量区域特征指标的优选

在评价河流水文情势变化特征时,传统水文改变指标法(indicators of hydrologic alteration,IHA)存在的指标间相关性高和数据冗余问题会造成整体评价偏差。对汉江下游流域的河流水文情势评价时,考虑到汉江流域干支流日均流量及取水调水工程等的影响,分别选择汉江干流上的3个水文站及支流流域的3个水文站点,采用主成分分析法对6个水文站IHA指标进行优选,再利用相关性分析结果进一步筛选,优选出适用于评价汉江下游流域水文情势的13个代表性指标,分别为2月流量、4月流量、7月流量、10月流量、12月流量、基流指数、最低流量出现日期、最高流量出现日期、低流量脉冲次数、高流量持续时间、日均流量增加率、日平均流量减少率和日均流量反转数。结果表明:6个水文站的代表性指标间相关性均大幅降低,13个代表性指标间的相关系数不超过0.3的占比约70%;经变化范围评价法(range of variability approach,RVA)验证,IHA指标与优选出的代表性指标对汉江下游流域整体水文改变度评价结果的差值均小于7.5个百分点,表明其能够对汉江下游流域提供较为全面合理的水文情势变化评价。

桥梁结构设计及选型研究

随着社会经济的发展和人们生活水平的提高,桥梁作为交通基础设施的重要组成部分,承担着连接地区、促进经济交流的重要职责。因此,桥梁的结构设计及其选型成为确保桥梁安全、经济、美观和符合功能需求的关键。为研究确定桥梁结构设计选型要点,文章结合某公路桥梁项目,通过分析上部结构及下部结构设计选型过程及要点,得出结论:在30 m跨径、40 m跨径的公路桥梁项目中,预应力混凝土箱梁+矩形单柱墩+肋板式桥台具有良好的适用性及经济性。

大跨径桩板式道路上下部合理结构选型研究

文章对比分析双T梁截面,T梁截面及组合型截面三种上部结构形式,从受力性能、经济性以及施工便利性方面综合考虑,得出上部最优结构形式,并提出4根φ600 mm墩柱、3根φ800 mm墩柱与3根φ600 mm墩柱三种下部结构方案,分析其变形大小和受力性能。结果表明,三种上部结构均满足规范要求,双T梁与T梁在经济性与施工便利性方面优于组合型截面,双T梁较T梁截面受力更优;下部三种结构形式均满足承载力要求,但φ800 mm墩柱结构受外力变形最小,承载力更大。

揿针联合耳穴埋籽对局部麻醉择期手术下肢静脉曲张患者术前焦虑情绪和生命体征的影响

目的:观察揿针联合耳穴埋籽对局部麻醉择期手术下肢静脉曲张患者术前焦虑情绪和生命体征的影响。方法:采用随机数字表法将180例拟行局部麻醉择期手术的下肢静脉曲张患者分为对照组与观察组各90例。2组均行常规护理治疗,对照组联合耳穴埋籽治疗,观察组在对照组基础上给予揿针治疗。比较2组临床疗效及治疗前后阿姆斯特丹术前焦虑与信息量表(APAIS)、生命体征指标(收缩压、舒张压、呼吸频率、心率)、视觉模拟评分法(VAS)评分、简易生活质量评估量表(SF-36)评分及血液流变学指标。结果:治疗后,观察组总有效率93.33%,高于对照组84.44%(P<0.05)。治疗后,2组APAIS (焦虑、信息需要)评分、VAS评分较治疗前降低(P<0.05),SF-36评分升高(P<0.05);观察组APAIS评分、VAS评分低于对照组(P<0.05),SF-36评分高于对照组(P<0.05)。2组治疗后收缩压、舒张压、呼吸频率、血液黏度、纤维蛋白原、红细胞沉降率均较治疗前降低(P<0.05),心率升高(P<0.05);观察组治疗后收缩压、舒张压、呼吸频率及血液流变学指标低于对照组(P<0.05),心率高于对照组(P<0.05)。结论:揿针联合耳穴埋籽治疗局部麻醉择期手术下肢静脉曲张,能够缓解患者术前焦虑情绪,改善生命体征与血液流变学指标,提高整体疗效。

广西桂林抽水蓄能电站下水库坝址与坝型比选

桂林抽水蓄能电站下水库位于较为对称的V形峡谷河段,两岸山体雄厚。从地形来看,下水库具备建造混凝土坝、当地材料坝的条件。笔者从地形地质条件、施工条件、工程投资等方面对下水库大坝坝址与坝型进行比选研究,通过对上、下坝址与坝型进行比较,确定推荐坝型,以及上、下坝址比选,最终选定下水库下坝址的沥青混凝土心墙坝方案。该研究成果可为类似工程的大坝坝址与坝型比选提供参考。

三角梅属(Bougainvillea)研究进展

以相关文献为基础,综述国内外1964—2016年三角梅属(Bougainvillea)研究概况.分别介绍三角梅属种质资源分布分类、品种选育、栽培繁殖、花期调控等方面的研究和发展情况,展望了三角梅属未来的研究方向.

扬子陆块下古生界页岩气保存条件分析

早古生代扬子陆块主要发育有下寒武统牛蹄塘组与上奥陶—下志留统五峰—龙马溪组2套富有机质页岩。受多期造山与多期成盆事件影响，2套页岩在经历广西、印支、燕山与喜马拉雅4期造山事件改造后，上扬子区及中扬子西部改造相对较弱、变形叠加期次最少（2～3期），页岩气保存条件最好、页岩气含量最高、最有资源前景；中扬子东部及下扬子区西部改造强度与变形叠加期次其次（3～4期），页岩气保存条件相对较差、页岩气含量相对较高、资源前景较好；下扬子区东部及扬子陆块周缘山前改造最强、变形叠加期次最多（4期），页岩气保存条件最差、页岩气含量较低、资源前景有限；陆块内部总体以残留复向斜区页岩气保存条件最好。

拉萨河下游河谷区三叶草引种品比试验研究

针对拉萨河谷的自然气候条件 ,选择了 9种三叶草品种进行集中品比试验 ,观察各种牧草的越冬率、生育期、高生长速率和产草量等生产形状。结果表明 ,拉萨河谷下游河谷区适合引种栽培三叶草 ,三叶草能够顺利越冬 ,能够取得与其它地区相似气候条件下的相当产量。在参试品种中 ,Zgrk880 2红三叶、Beskyd红三叶和Vesna红三叶是适宜于拉萨河谷下游的优良牧草品种 ,在越冬率、产草量、生长期和生长速率方面表现都是优良的品种 ,值得在拉萨河谷下游区推广。

塔里木盆地下古生界成藏控制因素及勘探思路

塔里木早古生代时并不是一个统一的盆地,在其后的发展演化历史中,又经历了多期成盆、多期发育与多期改造,从而最终成为叠合型盆地。这样的盆地发育特点造成塔里木盆地下古生界的多源生烃、多期生烃、多期运聚、多期成藏和多期改造。塔里木盆地下古生界油气成藏控制因素可以概括为"源控、隆控、坡控、面控、断控和相控"。与中国东部中、新生代原型盆地的"定洼选带"相比,其勘探思路应该是"定源选带"。在确定有效烃源灶的基础上,通过断层、不整合面以及输导层的研究确定与烃源灶有关系的有利勘探区带,根据烃源岩的热演化程度确定有利区带的勘探战略是以油勘探为主、气勘探为主还是油气并举。