Prevalence, Maternal and Perinatal Prognosis of Breech Delivery Compared to That of the Vertex in 242 Cases for 484 Controls at Ségou Hospital in Malti

Introduction: Breech birth has always been a subject of great interest because of its risks of perinatal morbidity and mortality. Aim: The aim of our study was to compare the maternal and perinatal prognosis of breech delivery with that of vertex delivery. Patients and Method: This was a retrospective case-control analytical study carried out in the obstetrics and gynaecology department of Ségou hospital over a 2-year period from 1 January 2020 to 31 December 2021, involving 242 breech deliveries compared with 484 top deliveries with a live single foetus without foetal malformation of gestational age ≥ 35 SA. The statistical tests used were: chi² (p Results: The frequency of breech delivery was 3.3%, with a predominance of caesarean section for breech presentation (64.88%) compared with 32.85% for vertex (P: 0.00;CI: (0.191 - 0.367). The perinatal prognosis of fetuses with breech presentations was marked by a higher rate of neonatal asphyxia (Apgar score Conclusion: Breech birth is relatively rare in our department. It carries a higher risk of maternal morbidity and neonatal morbidity than breech delivery. However, the vital prognosis for the mother was identical in both groups.

Hexagon-Islands Density and Size Distribution on Growing Single-Walled Carbon Nanotubes in the Kinetic 5-Vertex Model

A kinetic 5-vertex model is used to investigate hexagon-islands formation on growing single-walled carbon nanotubes (SWCNT). In the model, carbon atoms adsorption and migration processes on the SWCNT edge are considered. These two dynamic processes are assumed to be mutually independent as well as mutually dependent as far as the whole growth of the nanotube is concerned. Key physical parameters of the model are the growth time t, the diffusion length Γ defined as the ratio of the diffusion rate D to the carbon atomic flux F and the SWCNT chiral angle. The kinetic equation that describes the nanotube edge dynamics is solved using kinetic Monte Carlo simulations with the Bortz, Kalos and Lebowitz update algorithm. The behaviors of islands density and size distribution are investigated within the growth parameters’ space. Our study revealed key mechanisms that enable the formation of a new ring of hexagons at the SWCNT edge. The growth occurs either by pre-existing steps propagation or by hexagon-islands growth and coalescence on terraces located between dislocation steps, depending on values of model parameters. This should offer a road map for edge design in nanotubes production. We also found that in appropriate growth conditions, the islands density follows Gaussian and generalized Wigner distributions whereas their size distribution at a given growth time shows a decreasing exponential trend.

Rainbow Vertex-connection Number of Ladder and Mbius Ladder

A vertex-colored graph G is said to be rainbow vertex-connected if every two vertices of G are connected by a path whose internal vertices have distinct colors, such a path is called a rainbow path. The rainbow vertex-connection number of a connected graph G, denoted by rvc(G), is the smallest number of colors that are needed in order to make G rainbow vertex-connected. If for every pair u, v of distinct vertices, G contains a rainbow u-v geodesic, then G is strong rainbow vertex-connected. The minimum number k for which there exists a k-vertex-coloring of G that results in a strongly rainbow vertex-connected graph is called the strong rainbow vertex-connection number of G, denoted by srvc(G). Observe that rvc(G) ≤ srvc(G) for any nontrivial connected graph G. In this paper, for a Ladder L_n,we determine the exact value of srvc(L_n) for n even. For n odd, upper and lower bounds of srvc(L_n) are obtained. We also give upper and lower bounds of the(strong) rainbow vertex-connection number of Mbius Ladder.

Vertex治疗齿状突骨折伴寰枢椎脱位的早期并发症分析

[目的]分析Vertex治疗齿状突骨折伴寰枢椎脱位的早期并发症发生的原因和预防措施。[方法]对18例齿状突骨折伴寰枢椎脱位中的5例6项术中和术后早期发生的椎动脉损伤、失语、失明、大出血、置钉错误等并发症的原因进行分析,避免并发症的发生。[结果]所有发生的早期并发症都得到相应治疗,未遗留后遗症。[结论]Vertex治疗齿状突骨折伴寰枢椎脱位的早期并发症均可以预防,一旦发生及时治疗效果满意。

Vertex内固定系统治疗寰枢椎不稳:临床效果与植入物特征的关系

文章探讨了Vertex内固定系统植入治疗寰枢椎不稳定的临床效果与植入物材料学性能的相关性。选择2004-01/2006-01泸州医学院附属医院收治的寰枢椎脱位与不稳26例患者,采用美国美敦力·枢法模·丹历公司生产的Vertex颈椎后路钉棒内固定系统进行手术。对26例寰枢椎脱位患者采用Vertex内固定及寰枢椎融合术,摄动力位X射线片及CT检查寰枢椎稳定程度,记录每一例患者的术中并发症,术后功能恢复及融合情况。结果:①22例患者术后3个月X射线片显示寰枢融合成功,3例患者术后6个月X射线片显示寰枢融合成功,1例患者1年后植骨吸收再手术植骨,在术后3个月融合成功。②无脊髓损伤加重等并发症,术前JOA17分法评定脊髓功能3～17分,平均6.8分,术后为5～17分,平均14.8分,改善率83%。③26例患者颈部伸屈运动正常,旋转功能均有部分丢失,18例患者旋转达120°,6例患者旋转达100°,1例患者旋转达60°。Vertex内固定系统是颈椎后路钉棒内固定系统,因其具有万向螺钉和随意塑行的棒相连接,做到了固定可靠,节段长短随意和钉棒连接方便的临床应用优点。Vertex内固定系统治疗寰枢椎脱位术后效果亦比较理想。

导航下后路Vertex椎弓根螺钉在Hangman骨折治疗中的应用

目的探讨导航引导下Vertex椎弓根螺钉在Hangman骨折治疗中的应用。方法分析15例Hangman骨折患者,术中采用后路Vertex椎弓根螺钉进行固定、复位,植骨融合,并结合三维重建导航技术的使用。观察术中有无出现椎动脉或脊髓神经损伤等并发症,术后复查X线片了解骨折脱位的复位情况,随访观察内固定有无松动、神经功能恢复及植骨融合情况,综合评定该手术的可行性及疗效。结果 15例骨折脱位复位理想,随访5～24个月,内固定均未见松动,除1例植入异体松质骨粒术后14月未能达到骨性融合外,其他病例均达到植骨融合,颈2/3节段获得稳定,4例合并有颈髓损伤的患者术后得到恢复。结论 3D导航下Vertex椎弓根螺钉固定既可避免在置入椎弓根钉时损伤椎动脉及脊髓神经的风险,也可以为骨折脱位提供稳定的三柱固定,是治疗Hangman骨折理想的方法。

Vertex-distinguishing E-total Coloring of Complete Bipartite Graph K 7,n when7≤n≤95

Let G be a simple graph. A total coloring f of G is called an E-total coloring if no two adjacent vertices of G receive the same color, and no edge of G receives the same color as one of its endpoints. For an E-total coloring f of a graph G and any vertex x of G, let C（x） denote the set of colors of vertex x and of the edges incident with x, we call C（x） the color set of x. If C（u） ≠ C（v） for any two different vertices u and v of V （G）, then we say that f is a vertex-distinguishing E-total coloring of G or a VDET coloring of G for short. The minimum number of colors required for a VDET coloring of G is denoted by Хvt^e（G） and is called the VDE T chromatic number of G. The VDET coloring of complete bipartite graph K7,n （7 ≤ n ≤ 95） is discussed in this paper and the VDET chromatic number of K7,n （7 ≤ n ≤ 95） has been obtained.

Vertex-distinguishing IE-total Colorings of Cycles and Wheels

Let G be a simple graph. An IE-total coloring f of G refers to a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color. Let C（u） be the set of colors of vertex u and edges incident to u under f. For an IE-total coloring f of G using k colors, if C（u）=C（v） for any two different vertices u and v of V （G）, then f is called a k-vertex-distinguishing IE-total-coloring of G, or a k-VDIET coloring of G for short. The minimum number of colors required for a VDIET coloring of G is denoted by χievt（G）, and is called the VDIET chromatic number of G. We get the VDIET chromatic numbers of cycles and wheels, and propose related conjectures in this paper.

Vertex 60 SPECT双探头性能对比

Vertex60SPECT ,其双探头比单探头设备效率提高1倍。在应用中应特别重视双探头性能是否匹配 ,否则其图像反而不及单探头设备。用ADAC公司自带软件 ,对Vertex60SPECT仪的双探头进行性能测试和对比 ,结果各项指标均达到要求 。

Adjacent Vertex-distinguishing E-total Coloring on Some Join Graphs Cm V Gn

Let G(V, E) be a simple connected graph and k be positive integers. A mapping f from V∪E to {1, 2, ··· , k} is called an adjacent vertex-distinguishing E-total coloring of G(abbreviated to k-AVDETC), if for uv ∈ E(G), we have f(u) ≠ f(v), f(u) ≠ f(uv), f(v) ≠ f(uv), C(u) ≠C(v), where C(u) = {f(u)}∪{f(uv)|uv ∈ E(G)}. The least number of k colors required for which G admits a k-coloring is called the adjacent vertex-distinguishing E-total chromatic number of G is denoted by x^e_(at) (G). In this paper, the adjacent vertexdistinguishing E-total colorings of some join graphs C_m∨G_n are obtained, where G_n is one of a star S_n , a fan F_n , a wheel W_n and a complete graph K_n . As a consequence, the adjacent vertex-distinguishing E-total chromatic numbers of C_m∨G_n are confirmed.

Vertex-distinguishing IE-total Colorings of Complete Bipartite Graphs K8,n

Let G be a simple graph. An IE-total coloring f of G is a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color. For each vertex x of G, let C(x) be the set of colors of vertex x and edges incident to x under f. For an IE-total coloring f of G using k colors, if C(u) ≠ C(v) for any two different vertices u and v of G, then f is called a k-vertex-distinguishing IE-total-coloring of G or a k-VDIET coloring of G for short. The minimum number of colors required for a VDIET coloring of G is denoted by χ_(vt)^(ie) (G) and is called vertex-distinguishing IE-total chromatic number or the VDIET chromatic number of G for short. The VDIET colorings of complete bipartite graphs K_(8,n)are discussed in this paper. Particularly, the VDIET chromatic number of K_(8,n) are obtained.

Vertex-distinguishing VE-total Colorings of Cycles and Complete Graphs

Let G be a simple graph of order at least 2.A VE-total-coloring using k colors of a graph G is a mapping f from V (G) E(G) into {1,2,···,k} such that no edge receives the same color as one of its endpoints.Let C(u)={f(u)} {f(uv) | uv ∈ E(G)} be the color-set of u.If C(u)=C(v) for any two vertices u and v of V (G),then f is called a k-vertex-distinguishing VE-total coloring of G or a k-VDVET coloring of G for short.The minimum number of colors required for a VDVET coloring of G is denoted by χ ve vt (G) and it is called the VDVET chromatic number of G.In this paper we get cycle C n,path P n and complete graph K n of their VDVET chromatic numbers and propose a related conjecture.

New Vertex-Degree Condition for Pancyclic Graphs

Let G be a 2 connected graph with n vertices. In this paper, we prove that if there exist two vertices of any there independent vertices in G such that the sum of whose degree is at least n , then G is pancyclic, or G is K n/2,n/2 , or G is K n/2,n/2 -e , or G is a cycle of length 5.

Neighbourhood Unions and Vertex pancyclicity *

Let G be a 2 connected simple graph of order n ( n ≥5) and minimum degree δ . In this paper, we show that if for any two nonadjacent vertices u , v of G there holds | N(u)∪N(v)|≥n-δ , then G is {3,4} - vertex pancyclic unless G≌K n2,n2 .

Smarandachely Adjacent-vertex-distinguishing Proper Edge Coloring ofK4 V Kn

Let f be a proper edge coloring of G using k colors. For each x ∈ V（G）, the set of the colors appearing on the edges incident with x is denoted by Sf（x） or simply S（x） if no confusion arise. If S（u） = S（v） and S（v） S（u） for any two adjacent vertices u and v, then f is called a Smarandachely adjacent vertex distinguishing proper edge col- oring using k colors, or k-SA-edge coloring. The minimum number k for which G has a Smarandachely adjacent-vertex-distinguishing proper edge coloring using k colors is called the Smarandachely adjacent-vertex-distinguishing proper edge chromatic number, or SA- edge chromatic number for short, and denoted by Xsa（G）. In this paper, we have discussed the SA-edge chromatic number of K4 V Kn.

AN ALGORITHM FOR DETERMINING CONCAVE VERTEX OF OBJECT BASED ON VECTOR PRODUCT

Concave vertex of an object is an important parameter for analyzing an object’s shape. A new algorithm for searching concave vertex is proposed in this paper. The new algorithm requires tracking the border firstly,and then uses sampling border to obtain coordinates sequence of discrete boundary points. Each sampling point of the discrete border is determined to be either concave or convex according to the value of vector product. Two inflexions can be searched by the change of concavo-convex trend. The region between two inflexions is defined as concave area. The values of distance are calculated between all boundary points on the concave area and a straight line connected by two inflexions. The boundary point corresponding to the greatest distances is max concave vertex,or the object’s concave vertex. Experimental results have proved that the new algorithm can extract the max concave vertexes of an object accurately and reliably.

The Generalized Sine Theorem for Mixed Vertex Angle of Two Simplices and Applications

Some related problems of two n-dimensional simplices which are on an(n- 1)-dimensional hypersphere are investigated and a sine theorem of the k-dimensional mixed vertex angles which are defined in this paper is given. This result is a generalization of the sine theorem established. By using the generalized sine theorem, we present some new interesting geometric inequalities involving the k-dimensional vertex angles of each n-simplex and the k-dimensional mixed vertex angle of two n-simplices. These results can improve some recent results.

Realization of Vertex Operators of 7-Twisted Affine Lie Algebra ■[θ]

In this paper, we construct a new algebra structure 7-twisted atone Lie algebra sl（3,C）[θ] and study its vertex operator representations.

Vertex注塑系统与热凝工艺制作义齿的效果比较

目的:比较Vertex注塑系统与传统热凝工艺制作的义齿的临床使用效果。方法:随机选取100例无牙颌患者,分别采用这两种工艺制作义齿。随访患者2年,比较两组义齿的折裂,固位及人工牙脱落情况。结果:注塑组的折裂率、固位不良率、人工牙脱落率均低于传统热凝组。结论:与传统热凝工艺相比,Vertex注塑系统制作的义齿机械性能更稳定,组织适应性好,人工牙不易脱落,能满足临床应用。