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OALib Journal期刊

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Effect of Surfactant HLB Value on Settlement Stability of Magnetorheological Fluid  [PDF]
Yanwen Jiang, Yiping Luo, Hongjuan Ren, Dan Wei
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1105004
Abstract:
The hydrophilic-hydrophobic balance (HLB) of surfactants has a great influ-ence on surfactants. Among them, polyethylene glycol has an HLB value of 20 and is highly hydrophilic; oleic acid has an HLB value of 1, which is very lipophilic; and sodium dodecylbenzenesulfonate has an HLB value of 10.6 be-tween the two. This paper explores the use of these three surfactants with typi-cal HLB values to improve the performance of magnetorheological fluids, mainly to study its effect on the stability of magnetorheological fluids. Tests have shown that the use of lipophilic surfactants in oil-based magnetorheologi-cal fluids has better sedimentation stability than the use of hydrophilic surfac-tants.
Genome-Wide Detection of Genes Targeted by Non-Ig Somatic Hypermutation in Lymphoma
Yanwen Jiang, T. David Soong, Ling Wang, Ari M. Melnick, Olivier Elemento
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040332
Abstract: The processes of somatic hypermutation (SHM) and class switch recombination introduced by activation-induced cytosine deaminase (AICDA) at the Immunoglobulin (Ig) loci are key steps for creating a pool of diversified antibodies in germinal center B cells (GCBs). Unfortunately, AICDA can also accidentally introduce mutations at bystander loci, particularly within the 5′ regulatory regions of proto-oncogenes relevant to diffuse large B cell lymphomas (DLBCL). Since current methods for genomewide sequencing such as Exon Capture and RNAseq only target mutations in coding regions, to date non-Ig promoter SHMs have been studied only in a handful genes. We designed a novel approach integrating bioinformatics tools with next generation sequencing technology to identify regulatory loci targeted by SHM genome-wide. We observed increased numbers of SHM associated sequence variant hotspots in lymphoma cells as compared to primary normal germinal center B cells. Many of these SHM hotspots map to genes that have not been reported before as mutated, including BACH2, BTG2, CXCR4, CIITA, EBF1, PIM2, and TCL1A, etc., all of which have potential roles in B cell survival, differentiation, and malignant transformation. In addition, using BCL6 and BACH2 as examples, we demonstrated that SHM sites identified in these 5′ regulatory regions greatly altered their transcription activities in a reporter assay. Our approach provides a first cost-efficient, genome-wide method to identify regulatory mutations and non-Ig SHM hotspots.
Solid-surface vitrification is an appropriate and convenient method for cryopreservation of isolated rat follicles
Weijie Xing, Canquan Zhou, Jiang Bian, Markus Montag, Yanwen Xu, Yubin Li, Tao Li
Reproductive Biology and Endocrinology , 2010, DOI: 10.1186/1477-7827-8-42
Abstract: Isolated follicles from female Sprague-Dawley rats were randomly assigned to SSV, OPS and slow-rate freezing groups for cryopreservation. Follicle viability assessment and ultrastructural examination were performed after thawing. In order to study the developmental capacity of thawed follicles, we performed in vitro culture with a three-dimensional (3D) system by alginate hydrogels.Our results showed that the totally viable rate of follicles vitrified by SSV (64.76%) was slightly higher than that of the OPS group (62.38%) and significantly higher than that of the slow-rate freezing group (52.65%; P < 0.05). The ultrastructural examination revealed that morphological alterations were relatively low in the SSV group compared to the OPS and slow-rate freezing groups. After in vitro culture within a 3D system using alginate hydrogels, we found the highest increase (28.90 ± 2.21 μm) in follicle diameter in follicles from the SSV group. The estradiol level in the SSV group was significantly higher than those in the OPS and slow-rate freezing groups at the end of a 72-hr culture period (P < 0.05).Our results suggest that the SSV method is an appropriate and convenient method for cryopreservation of isolated rat follicles compared with the conventional slow-rate freezing method and the OPS method.Ovarian cortical tissue contains high numbers of primordial and primary follicles. Hence cryopreservation of ovarian cortex has become a potential option to restore fertility in young women with cancer [1]. However, many studies have shown the risks of cancer transmission following transplantation of ovarian tissues especially in cases of blood-borne cancer. Oktay et al. [2] reported the first successful isolation of primordial follicles from human ovaries by a gentle enzymatic technique using collagenase in combination with manual dissection. As a result, an optimized protocol with a mixture of purified collagenase for digestion has been developed. This method yields good-quality
AGDL: A Definition Language for Attribute Grammars
Qu,Yanwen
计算机科学技术学报 , 1986,
Abstract: AGDL is a definition language for attribute grammars. It is a specification language usedto generate a compiler automatically. AGDL, whose rules are easy to read, is an applicativelanguage with abstract data types, and it will be used as an important tool language to developcompiler generators by NCI.
On two dimensional non-abelian chiral lattice gauge theories in Ginsparg-Wilson formalism
Yanwen Shang
Physics , 2013,
Abstract: Defining chiral lattice gauge theories in the Ginsparg-Wilson formalism is complicated by the so-called fermion measure problem. It has been proven for the abelian theories that smooth well-behaved fermion measure exists if and only if the anomaly-free condition is granted, and the same was shown to hold in perturbative theories for non-abelian gauge groups, but the non-perturbative proof is absent. In this paper, we consider a simpler problem in 2-d and present a proof for the existence of smooth and gauge invariant fermion measure on the gauge field configuration space with zero field strengths for arbitrary compact Lie groups, provided the anomaly-free conditions are satisfied. It is conjectured that such consideration is sufficient for the unknown full proof.
Correlation functions in the holographic replica method
Yanwen Shang
Physics , 2012, DOI: 10.1007/JHEP12(2012)120
Abstract: Disorder has long been a difficult subject in condensed matter systems and the The replica method is a well-known tool in this field. Implementing the replica method the AdS/CFT correspondence has been proposed and discussed in literatures. We point out, for any CFT that has a holographic dual and to the leading order of the large-N expansion, the corrections due to the presence of random disorder to any connected correlation functions vanish identically, provided that the disorder strength is normalized as discussed in literatures and that the symmetry among replicas is unbroken. Same must hold true to any observables that are determined by the connected correlation functions through a linear relation. This behavior resembles strongly that of a free theory where disorder is coupled to the fundamental field. We demonstrate this by both the means of holographic principle and field theory analysis in a toy model. We also propose ways of evaluating the non-zero sub-leading effects perturbatively in terms of the disorder strength and discuss a novel possibility of defining a new holographic dual if we adopt a different normalization for the disorder strength.
The design of Wireless-temperature Measure Based On Ptr2000
基于PTR2000的无线温室温度测量系统的设计

Xu MingSheng,Wang Jiang,Wu YanWen,Luo Ji,
徐鸣生
,王强,吴彦文,罗奇

计算机系统应用 , 2005,
Abstract: 利用单线数字测温芯片DS18B20来检测温室环境的温度,提高了温度检测的精度,降低了干扰;并且利用 FLASH芯片作为系统的移动式存储单元,方便了数据转移,降低了成本;通过无线数据传输模块PTR2000完成单片 机与PC机的无线通信,降低了布线成本,减少了由于线缆故障造成的损失,并在传统PC通信流程的基础上做了 改进,提高了通信的质量,有一定的实用价值。
Chiral Lattice Gauge Theories Via Mirror-Fermion Decoupling: A Mission (im)Possible?
Erich Poppitz,Yanwen Shang
Physics , 2010, DOI: 10.1142/S0217751X10049852
Abstract: This is a review of the status and outstanding issues in attempts to construct chiral lattice gauge theories by decoupling the mirror fermions from a vectorlike theory. In the first half, we explain why studying nonperturbative chiral gauge dynamics may be of interest, enumerate the problems that a lattice formulation of chiral gauge theories must overcome, and briefly review our current knowledge. We then discuss the motivation and idea of mirror-fermion decoupling and illustrate the desired features of the decoupling dynamics by a simple solvable toy model. The role of exact chiral symmetries and matching of 't Hooft anomalies on the lattice is also explained. The second, more technical, half of the article is devoted to a discussion of the known and unknown features of mirror-decoupling dynamics formulated with Ginsparg-Wilson fermions. We end by pointing out possible directions for future studies.
"Light from chaos" in two dimensions
Erich Poppitz,Yanwen Shang
Physics , 2008, DOI: 10.1142/S0217751X08041281
Abstract: We perform a Monte-Carlo study of the lattice two-dimensional gauged XY-model. Our results confirm the strong-coupling expansion arguments that for sufficiently small values of the spin-spin coupling the ``gauge symmetry breaking" terms decouple and the long-distance physics is that of the unbroken pure gauge theory. We find no evidence for the existence, conjectured earlier, of massless states near a critical value of the spin-spin coupling. We comment on recent remarks in the literature on the use of gauged XY-models in proposed constructions of chiral lattice gauge theories.
Lattice chirality, anomaly matching, and more on the (non)decoupling of mirror fermions
Erich Poppitz,Yanwen Shang
Physics , 2009, DOI: 10.1088/1126-6708/2009/03/103
Abstract: We study 't Hooft anomaly matching in lattice models with strong Yukawa or multi-fermion interactions. Strong non-gauge interactions among the mirror fermions in a vectorlike lattice gauge theory are introduced with the aim to obtain, in a strong-coupling symmetric phase, a long-distance unbroken gauge theory with chiral fermions in a complex representation. We show how to use exact lattice chirality to analyze the anomaly matching conditions on chiral symmetry current correlators at finite lattice spacing and volume. We perform a Monte Carlo study of the realization of anomaly matching in a toy two-dimensional model with an anomalous mirror-fermion content at strong mirror Yukawa coupling. We show that 't Hooft anomaly matching is satisfied, in most of the phase diagram, via the minimal solution in either the massless fermion or "Goldstone" mode, while in some cases there are extra massless vectorlike mirror fermions. The mirror spectrum at strong coupling is thus consistent with long-distance unitarity. We discuss the implications of our results for future studies of the most interesting case of the decoupling of anomaly-free mirror-fermion sectors.
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