Excluded Volumes of Anisotropic Convex Particles in Heterogeneous Media:Theoretical and Numerical Studies

Understanding the excluded volume of anisotropic particle is of great importance in the evaluation of continuum percolation and random packing behaviors of soft/hard particle systems in heterogeneous disordered media.In this work,we obtain the excluded volumes of several anisotropic convex particles including prolate spheroids,oblate spheroids,spherocylinders,and Platonic particles,using theoretical and numerical approaches.According to the second virial coefficient,we first present a theoretical scheme for determining the excluded volumes of anisotropic particles.Also,the mean tangent diameters of anisotropic convex particles are formulated by the quantitative stereology.Subsequently,Monte Carlo simulations are demonstrated to numerically evaluate the excluded volumes.The theoretical results of the dimensionless excluded volume are thereafter compared with that of the numerical results to verify the validity of the theoretical scheme.We further investigate the dependence of the dimensionless excluded volume on the geometric characteristics of anisotropic particles based on the proposed theoretical and numerical schemes.Results show that the dimensionless excluded volume mainly relies on the shape and surface information of anisotropic particles.The developed theoretical and numerical schemes can provide theoretical insights into the percolation threshold and packing density of soft/hard anisotropic particle systems in heterogeneous materials,physics,and chemistry fields.

Theoretical model of biomacromolecule through nanopore including effects of electrolyte and excluded volume

A theoretical model for the translocation process of biomacromolecule is developed based on the self-consistent field theory （SCFT）, where the biomacromolecule is regarded as a self-avoiding polymer chain actuated by the external potential. In this theoretical model, the external potential, the Coulomb electrostatic potential of the charged ions （the electrolyte effect）, and the attractive interaction between the polymer and the nanopore （the excluded volume effect） are all considered, which have effects on the free energy landscape and conformation entropy during the translocation stage. The result shows that the entropy barrier of the polymer in the solution with high valence electrolyte is much larger than that with low valence electrolyte under the same condition, leading to that the translocation time of the DNA molecules in the solution increases when the valence electrolyte increases. In addition, the attractive interaction between the polymer and the nanopore increases the free energy of the polymer, which means that the probability of the translocation through the nanopore increases. The average translocation time decreases when the excluded volume effect parameter increases. The electrolyte effect can prolong the average translocation time. The simulation results agree well with the available experimental results.

Excluded Minority of P8 for GF(4)-Representability

One of the mainly interesting things of matroid theory is the representability of a matroid. Finding the set of all excluded minors for the representability is the solution of the representability. In 2000, Geelen, Gerards and Kapoor proved that is the complete set of GF(4)-representability. In this paper, we show that is an excluded minor for GF(4)-representability.

STIFFNESS AND EXCLUDED VOLUME EFFECTS ON CONFORMATION AND DYNAMICS OF POLYMERS:A SIMULATION STUDY

This work investigates the effects of the excluded volume and especially those of the chain stiffness on the structural and dynamical properties of a model polymer chain. The theoretical framework is the same as in the recent works by Steinhauser et al., where a Rouse approach is adopted. Our model differs in that our chains have a finite average bending angle. As in the works by Steinhauser et al., Langevin dynamic simulations were performed without hydrodynamic interactions. Whereas this doesn＇t impact the static properties we obtain, it also allows us to compare our results on dynamic properties to those predicted by Rouse theory, where hydrodynamic interactions are also neglected. Our results show that the structural properties are very sensitive to the chain stiffness, whereas the dynamic scaling laws remain the same as those by Rouse theory, with the prefactor depending on the persistence length.

Should Civil Servants Be Excluded From Public Hearings?

In order to prevent public hearings from becoming a farce,the city of Guangzhou,capital of south China’s Guangdong Province,enacted trial regulations to ensure more fairness and justice at public hearings,which are organized when local residents have major disagreements on important city issues.

低渗透设计GORE EXCLUDER覆膜支架在复杂腹主动脉瘤腔内治疗中的应用

目的评价低渗透设计GORE EXCLUDER覆膜支架腔内治疗复杂腹主动脉瘤的安全性和有效性。方法 2011年4月—2014年4月应用低渗透设计GORE EXCLUDER覆膜支架腔内治疗复杂腹主动脉瘤21例,收集患者资料并进行回顾性分析。结果 21例患者中,男19例,女2例;年龄55~87岁,中位数为72.34岁。本组病例存在以下1种或多种情况：合并髂动脉瘤10例,巨大动脉瘤4例,短瘤颈3例,瘤颈严重扭曲3例,入路严重扭曲4例,股动脉纤细1例,附壁血栓和严重钙化6例。21例手术均获成功,无中转开腹及术中死亡病例,2例术后住院期间死于合并症。手术时间（135.43±12.45）min,术中出血量为（180.24±21.66）m L,均无输血。术中Ⅰ型内漏5例,Ⅱ型内漏3例,Ⅲ型内漏2例,均术中处理满意。术后随访19例,随访时间为3~36个月,18例存活,1例死于糖尿病并发症。随访患者术后均复查CT血管造影,未发现与支架相关的并发症。结论低渗透设计GORE EXCLUDER覆膜支架腔内修复适用于多数复杂腹主动脉瘤患者的治疗,手术风险较低,术中和术后并发症较少,具有良好的安全性和有效性。

GORE EXCLUDER覆膜支架在腹主动脉瘤腔内修复术中的临床应用

目的：探讨GORE EXCLUDER覆膜支架腔内修复治疗腹主动脉瘤的疗效.方法：回顾性分析自2012年1月至2013年5月,采用GORE EXCLUDER覆膜支架行腹主动脉瘤腔内修复术的21例患者,其中男性19例,女性2例,年龄48 ～ 84岁,平均（68.9±9.9）岁.21例均为肾下型腹主动脉瘤,术后1,3,6及12个月之后,每年行主动脉CTA复查.结果：21例均成功置入GORE EXCLUDER覆膜支架,技术成功率100％；共置入主体覆膜支架21枚,对侧分支支架21枚,延长支6枚,Cuff支架1枚.主体覆膜支架直径23 ～31 mm,长度为120 ～ 180 mm,平均（152-±20.7）mm; 16例封闭一侧髂内动脉,5例保留双侧髂内动脉.围手术期无死亡病例及严重并发症发生；随访3 ～15个月,未见支架移位及内漏发生.结论：GORE EXCLUDER腔内修复肾下腹主动脉瘤近、中期效果良好.

应用覆膜支架台上开窗治疗短瘤颈腹主动脉瘤1例

腹主动脉瘤（abdominal aortic aneurysm,AAA）是指腹主动脉呈瘤样扩张,直径增大50%以上定义为动脉瘤。目前,AAA腔内修复术（endovascular aneurysm repair,EVAR）已广泛应用于AAA的治疗,其特点是创伤和痛苦小,术后恢复快,手术期并发症的发生率和病死率低,尤其对一些有严重合并症、对传统开腹血管重建手术耐受性差的患者提供了治愈机会[1]。但符合传统EVAR标准解剖结构的AAA仅占总数的20%~50%[2]。

CLINICAL OBSERVATION ON OSTEOPOROSIS TREATED WITH TRADITIONAL KIDNEY-TONIFYING MEDICAMENTS

The method of scoring kidney deficiency symptoms and bone density was used to judge therapeutic efficacy on osteoporosis of traditional kidney-tonifying drugs. It was proved that the drugs not only improved clinical symptoms but also delayed the developmental pro-cess of this disorder. It also verified the correctness of the traditional theory that the kidney dominates the bone and generates the marrow.

Problem of living liver donation in the absence of deceased liver transplantation program:Mansoura experience

We report our experience with potential donors for living donor liver transplantation(LDLT), which is the first report from an area where there is no legalized deceased donation program. This is a single center retrospective analysis of potential living donors(n = 1004) between May 2004 and December 2012. This report focuses on the analysis of causes, duration, cost, and various implications of donor exclusion(n = 792).Most of the transplant candidates(82.3%) had an experience with more than one excluded donor(median = 3). Some recipients travelled abroad for a deceased donor transplant(n = 12) and some died before finding a suitable donor(n = 14). The evaluation of an excluded donor is a time-consuming process(median = 3 d, range 1 d to 47 d). It is also a costly process with a median cost of approximately 70 USD(range 35 USD to 885 USD). From these results, living donor exclusion has negative implications on the patients and transplant program with ethical dilemmas and an economic impact. Many strategies are adopted by other centers to expand the donor pool; however, they are not all applicable in our locality. We conclude that an active legalized deceased donor transplantation program is necessary to overcome the shortage of available liver grafts in Egypt.

CLINICAL OBSERVATION ON ACUPUNCTURE TRETMENT OF UROSCHESIS

Uroschesis is manifested by. incompleteness or difficulty in urination or even incapability of urination. Clinically, the symptoms include retention of urine and anuria induced by a variety of causes. In this study, the patients with anuria or oliguria due to lesions of renal parenchyma or renal failure were excluded. Using acupuncture, the author had treated 36 cases of functional uroshesis with satisfactory results as reported in the following.

COMPLEXITY ANALYSIS OF TIME SERIES GENERATED BY ELEMENTARY CELLULAR AUTOMATA

Using the tools of distinct excluded blocks, computational search and symbolic dynamics, the classification problem of all 256 elementary cellular automata is discussed from the point of view of time series generated by them,and examples in each class are provided to explain the methods used.

VISCOMETRIC INVESTIGATIONS OF POLYVINYLPYRROLIDONE IN MIXED SOLVENTS AND WITH VARYING TEMPERATURE

The viscosity behavior of polyvinylpyrrolidone(PVP)has been determined at 25℃ in mixed solvents comprising water/dimethylformamide(DMF)and water/methanol(MeOH).Analysis of the data has considered the PVP as being both host and guest polymer in solution.The intrinsic viscosity of PVP in DMF is higher than in water and in MeOH,but also increases in a mixed solvent with high water content because of the effect of polymer-solvent interactions.It was also found that the intrinsic viscosity of PVP at finite concentration,[η_(pvp)]_c decreases with an increase in the concentration of PVP in solution.The viscosity behavior of PVP in a mixed solvent is affected by the concentration-dependent intermolecular excluded volume effect,which can be quantitatively expressed by the parameter,b_Y,which reflects the shrinkage of PVP chain coils,resulting in a decrease of[η_(pvp)]_c.The effect of temperature on the viscosity behavior of PVP in MeOH shows that the interaction parameter increases up to a maximum value,and then decreases after a certain temperature.

Construction ot retroviral vectors containing human multidrug resistance gene (mdr1) and their expression in NIH3T3 cells

In order to increase the expression of mdrl genetransfectcd using retroviral vcctors, we constructedtwo retroviral vectors (LmdrlSN and MSCV-mdrl)containing mdrl cDNA and compared the expressionof mdrl gene with another vector pHamdrl/A(Pastan et al. Proc Natl Acad Sci USA 85: 4486,1986) in NIH.3T3 cells. The LmdrlSN was made

倒装Gore Excluder对侧喇叭腿支架治疗孤立性髂动脉瘤1例

患者,男性,77岁。因＂突发胸背部疼痛1天＂于2017年3月8日入住我院心血管内科,入院后行全主动脉CT血管造影（computed tomography angiography,CTA）显示：胸主动脉弓降部小弯侧溃疡;左髂总动脉瘤（瘤体最大直径40 mm,近端髂总动脉瘤颈直径16 mm、长度15 mm,远端髂外动脉直径12 mm）（图1）。于2017年3月14日,气管插管全麻下行胸主动脉溃疡腔内隔绝＋左锁骨下动脉烟囱支架植入＋左髂内动脉栓塞＋左髂动脉腔内隔绝（倒装Gore Excluder对侧喇叭腿支架）术。

氢化物发生技术和ICP-AES联用的前景

Hydride generation (HG)technique has been widely used for the determination of volatile hydride forming elements by atomic spectroscopy since Holak reported the determination of arsenic with this technique using atomic absorption spectrometry in 1969. The most commonly used

BaPb_(0.75)Bi_(0.25)O_3交流互感的测量(英文)

本文主要描述了怎样通对超导粉末材料BaPb_(0.75)Bi_(0.25)O_3交流互感的测量获得它的临界温度（T_c）。将样品放到磁场中,当磁场改变时,其监界温度T_c也随着变化。

Transcatheter treatment of atrial septal defect versus surgery.Predictive rate of suitable defects

Introduction: A transcatheter closure of atrial septal defect(ASD)with the Amplatzer septal occluder(ASO)is a newperspective non-surgical method of treatment of this congenitalheart defect.The aim of the study was to determine the rate of suitable defectsfur this new non-surgical techuique.Patients and methods:From9/95-9/97,77 patients with secundum ASD underwent an attemptat transcatheter closure;.at a median age of 9.3 yr.(range,2.1-43.5 yr.)and meaian weight of 32 kg(range,13-68kg).The most important echocardiograghic criteria for successfulctosure are sufficient rims around the defect,diameter ot medefect and total length of atrial septum.3 pts which not fulfilcriteria were excluded from transthoracic echocardiograpny(TTE).11 pts were excluded from transesophageal TTE,2 ptswere excluded during intervention.we evaluate this results anacompare it with the values frrom perioperative morphomethry otASD’s in 353 patients who underwent surgety(years-90).Results:The medlian ASD size measured by TEE was 11.7 mm(range,5-23 mm)and the median stretched diameter was 13.9mm(range,5-24 mm).All devices were placed correctly.Therewas no complication related to the closure.On a median follow-up interval of 8.5 months(range 0.4-2.2 yr)there has been noepisodes of endocarditis,thromboembofism or wire fracture and58/61 pts(95%)had complete closure,as assessed by TTE.Conclusion From 77 patiehts 61 fulfil criteria and successfullyunderwent a transcathter closure of ASD,which represents 79%.In 353 patients who underwent surgery authors compare the areaof the defect and the septal area.278 pts(78%)had suitabledefect for transcatheter closure.We conclude that a new selfexpandable,repositionable ASO is affording a safe and defectivemethod to close small-large secundum ASD’s.Suitable defectsfor this procedure are in the majority(up to 80%)of patients withsecundum ASD.

Letters to the Editor

The Editor welcomes submissions for possible publication in the Letters to the Editor section.Letters commenting on an article published in the Journal or other interesting pieces will be considered if they are received within 6 weeks of the time the article was published.Authors of the article being commented on will be given an opportunity to offer a timely response to the letter Authors of letters will be notified that the letter has been received. Unpublished letters cannot be returned.

Market

In July,China’s consumer market maintained a stable growth.The retail sales of consumer goods in July reached RMB 2.69 trillion,going up 10.2%year on year,0.4 percentage points lower than that of the previous month.The actual growth was 9.8%with the price factor excluded.In January-July,the accumulative growth was 10.3%year on year,remaining the same as that in the first half of