Binding Energy, Root Mean Square Radius and Magnetic Dipole Moment of the Triton Nucleus

The basis functions of the translation invariant shell model are used to construct the ground state nuclear wave functions of 3H. The used residual two-body interactions consist of central, tensor, spin orbit and quadratic spin orbit terms with Gaussian radial dependence. The parameters of these interactions are so chosen in such a way that they represent the long-range attraction and the short-range repulsion of the nucleon-nucleon interactions. These parameters are so chosen to reproduce good agreement between the calculated values of the binding energy, the root mean-square radius, the D-state probability, the magnetic dipole moment and the electric quadrupole moment of the deuteron nucleus. The variation method is then used to calculate the binding energy of triton by varying the oscillator parameter which exists in the nuclear wave function. The obtained nuclear wave functions are then used to calculate the root mean-square radius and the magnetic dipole moment of the triton.

Structure,Binding Characteristics,and 3D Model Prediction of a Newly Identified Odorant-Binding Protein from the Cotton Bollworm,Helicoverpa armigera (Hübner)

The full-length sequence of the odorant binding protein 5 gene,HarmOBP5,was obtained from an antennae cDNA library of cotton bollworm,Helicoverpa armigera （Hübner）.The cDNA contains a 444 bp open reading frame,encoding a protein with 147 amino acids,namely HarmOBP5.HarmOBP5 was expressed in Escherichia coli and the recombinant protein was purified by affinity chromatography.SDS-PAGE and Western blot analysis demonstrated that the purified protein can be used for further investigation of its binding characteristics.Competitive binding assays with 113 odorant chemicals indicated that HarmOBP5 has strong affinity to some special plant volatiles,including （E）-β-farnesene,ethyl butyrate,ethyl heptanoate,and acetic acid 2-methylbutyl ester.Based on three-dimensional （3D） model of AaegOBP1 from Aedes aegypti,a 3D model of HarmOBP5 was predicted.The model revealed that some key binding residues in HarmOBP5 may play important roles in odorant perception of H.armigera.This study provides clues for better understanding physiological functions of OBPs in H.armigera and other insects.

Analysis and Experimental Study on the Friction Force at the Binding Point of Flexible Cable on Satellite

Mainly for the problem that the friction force generated by the existing process of bind-ing,fixing and fastening the flexible cable on the satellite is unknown,the friction force analysis and experimental research on the binding point of the flexible cable are carried out.The equivalent model of the cable bundle bound by nylon cable ties is established,the force on the binding point is analyzed,and the empirical formula for calculating the friction force at the binding point is estab-lished.The formula shows that the friction force is related to the cable bundle diameter,the number of winding cycles of silicone rubber tape,the width of nylon cable ties,and the binding force.The friction force tests of the cable diameter of 5.06 mm,8.02 mm,24.02 mm,38.04 mm under different winding turns of tape were carried out,which was compared with the theoretical calculation value.It is concluded that the calculation accuracy of the theoretical model is more than 95%,which can estimate the actual friction force value accurately.This provides a reference and basis for the theoretical and experimental research on the friction force of the flexible cable binding point on satellite.

THE GENERALIZED RIEMANN PROBLEM FOR A SCALAR NONCONVEX COMBUSTION MODEL-THE PERTURBATION ON INITIAL BINDING ENERGY

In this article, we study the generalized Riemann problem for a scalar non- convex Chapman-Jouguet combustion model in a neighborhood of the origin （t 〉 0） on the （x, t） plane. We focus our attention to the perturbation on initial binding energy. The solutions are obtained constructively under the entropy conditions. It can be found that the solutions are essentially different from the corresponding Riemann solutions for some cases. Especially, two important phenomena are observed： the transition from detonation to deflagration followed by a shock, which appears in the numerical simulations [7, 27]; the transition from deflagration to detonation （DDT）, which is one of the core problems in gas dynamic combustion.

Next-Nearest-Neighbor Tight-Binding Model of Plasmons in Graphene

In this paper we investigate the influence of the next-nearest-neighbor coupling on the spectrum of plasmon excitations in graphene. The nearest-neighbor tight-binding model was previously considered to calculate the plasmon spectrum in graphene [1]. We extend these results to the next-nearest-neighbor tight-binding model. As in the calculation of the nearest-neighbor model, our approach is based on the numerical calculation of the dielectric function and the loss function. We compare the plasmon spectrum of the two models and discuss the differences in the dispersion.

Size dependence of biexciton binding energy in single InAs/GaAs quantum dots

This paper studies the size dependence of biexciton binding energy in single quantum dots （QDs） by using atomic force microscopy and micro-photoluminescence measurements. It finds that the biexciton binding energies in the QDs show ＂binding＂ and ＂antibinding＂ properties which correspond to the large and small sizes of QDs, respectively. The experimental results can be well interpreted by the biexciton potential curve, calculated from the exciton molecular model and the Heitler London method.

The Strong Cooperativity of Dioxygen Binding by Dicobalt(II) Diporphyrin Compounds in Nonaqueous Solution at Room Temperature

Thermodynamic data were determined for the reversible binding of O 2 to two compounds of dicobalt(II) di(meso tetra phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co 2PP 8 and Co 2PP 4) in N,N dimethylformamide at room temperature. The partial pressure of dioxygen necessary for half oxygenation ( P 1/2 ) and Hill coefficient ( n ) at 298 K were determined as follows: P 1/2 =54.2 kPa, n =2.0 for Co 2PP 8 and P 1/2 =6.8 kPa, n =1.8 for Co 2PP 4,respectively. The rate equations of reversible oxygen binding by Co 2PP 8 were determined and the reaction path was proposed. The results of thermodynamic and kinetic studies indicate that there exists strong cooperative effect during oxygenation of the compounds. The ESR observation reveals that the dioxygen complexes formed in the solutions are of superoxo (Co O - 2) type.

Temperature Induces Self-assembly of Silicon Nano/Micro-structure based on Multi-physics Approach

A three-dimensional dynamic model for nano/micro-fabrications of silicon was presented. With the developed model, the fabrication process of silicon on nothing（SON） structure was quantitatively investigated. We employ a diffuse interface model that incorporates the mechanism of surface diffusion. The mechanism of the fabrication is systematically integrated for high reliability of computational analysis. A semi-implicit Fourier spectral scheme is applied for high efficiency and numerical stability. Moreover, the theoretical analysis provides the guidance that is ordered by the fundamental geometrical design parameters to guide different fabrications of SON structures. The performed simulations suggest a substantial potential of the presented model for a reliable design technology of nano/micro-fabrications.

Pairing Effect on the Binding Energy Curve of N = Z Atomic Nuclei

The saw-tooth phenomenon on the binding energy curve of N = Z nuclei is due to the low binding energy between the α-particles. It was suspected by Gamow to be of van der Waals type, found here to be deuteron bonds. The binding energy per nucleon, in absolute value, of an α-particle is larger than any other combination of 4 nucleons. Therefore, the binding energy per nucleon is low for odd-odd N = Z nuclei and maximum for even-even N = Z nuclei. The assumption of N = Z nuclei to be an assembly of α-particles and deuteron bonds predicts the binding energy of the 32 first N = Z nuclei with a rms deviation of 0.25 MeV.

Molecular Cloning, Expression Pattern, and 3D Structural Prediction of the Cold Inducible RNA- Binding Protein(CIRP) in Japanese Flounder(Paralichthys olivaceus)

Cold-inducible RNA-binding protein(CIRP) is a kind of RNA binding proteins that plays important roles in many physiological processes. The CIRP has been widely studied in mammals and amphibians since it was first cloned from mammals. On the contrary, there are little reports in teleosts. In this study, the Po CIRP gene of the Japanese flounder was cloned and sequenced. The genomic sequence consists of seven exons and six introns. The putative Po CIRP protein of flounder was 198 amino acid residues long containing the RNA recognition motif(RRM). Phylogenetic analysis showed that the flounder Po CIRP is highly conserved with other teleost CIRPs. The 5' flanking sequence was cloned by genome walking and many transcription factor binding sites were identified. There is a Cp Gs region located in promoter and exon I region and the methylation state is low. Quantitative real-time PCR analysis uncovered that Po CIRP gene was widely expressed in adult tissues with the highest expression level in the ovary. The m RNA of the Po CIRP was maternally deposited and the expression level of the gene was regulated up during the gastrula and neurula stages. In order to gain the information how the protein interacts with m RNA, we performed the modeling of the 3D structure of the flounder Po CIRP. The results showed a cleft existing the surface of the molecular. Taken together, the results indicate that the CIRP is a multifunctional molecular in teleosts and the findings about the structure provide valuable information for understanding the basis of this protein's function.

Computational Determination of the Binding Mode of α-Conotoxin to Nicotinic Acetylcholine Receptor

Conotoxins belong to the large families of disulfide-rich peptide toxins from cone snail venom, and can act on a broad spectrum of ion channels and receptors. They are classified into different subtypes based on their targets. The α-conotoxins selectively inhibit the current of the nicotinic acetylcholine receptors. Because of their unique selectivity towards distinct n ACh R subtypes, α-conotoxins become valuable tools in n ACh R study. In addition to the X-ray structures of α-conotoxins in complex with acetylcholine-binding protein, a homolog of the n ACh R ligand-binding domain, the high-resolution crystal structures of the extracellular domain of the α1 and α9 subunits are also obtained. Such structures not only revealed the details of the configuration of n ACh R, but also provided higher sequence identity templates for modeling the binding modes of α-conotoxins to n ACh R. This mini-review summarizes recent modeling studies for the determination of the binding modes of α-conotoxins to n ACh R. As there are not crystal structures of the n ACh R in complex with conotoxins, computational modeling in combination of mutagenesis data is expected to reveal the molecular recognition mechanisms that govern the interactions between α-conotoxins and n ACh R at molecular level. An accurate determination of the binding modes of α-conotoxins on ACh Rs allows rational design of α-conotoxin analogues with improved potency or selectivity to n ACh Rs.

S100钙结合蛋白β与α突触核蛋白与帕金森病患者抑郁及运动障碍的关系

目的研究帕金森病(PD)患者血清S100钙结合蛋白β(S100β)及α突触核蛋白(α-syn)水平与患者抑郁及运动障碍的关系。方法选择2022年1月至12月聊城市人民医院收治的PD患者194例,根据汉密尔顿抑郁量表评分分为非抑郁组102例(0~13分)及抑郁组92例(≥14分)。运动障碍采用Hoehn-Yahr(H-Y)分级及统一帕金森病评定量表Ⅲ(UPDRS-Ⅲ)进行评分,用多因素logistic回归分析PD患者抑郁的独立危险因素,用Spearman相关性分析血清S100β及α-syn水平与患者抑郁及运动障碍的关系。结果抑郁组体质量指数低于非抑郁组,H-Y分级、UPDRS-Ⅲ评分、S100β、α-syn均高于非抑郁组,差异有统计学意义(P<0.05,P<0.01)。多因素logistic回归分析显示,H-Y分级、UPDRS-Ⅲ评分、S100β、α-syn为PD患者抑郁的独立危险因素(P<0.05)。Spearman相关性分析显示,PD患者S100β水平与H-Y分级、UPDRS-Ⅲ评分呈正相关(r=0.698,P=0.005;r=0.637,P=0.011);α-syn水平与H-Y分级、UPDRS-Ⅲ评分呈正相关(r=0.654,P=0.021;r=0.611,P=0.035)。ROC曲线显示,S100β、α-syn诊断PD患者抑郁的截断值分别为486.65μg/L、3894.27 ng/L,曲线下面积分别为0.889(95%CI:0.812~0.923)、0.761(95%CI:0.714~0.828),S100β曲线下面积显著优于α-syn(P<0.05)。结论PD患者血清S100β、α-syn水平与其抑郁发生及运动功能障碍密切相关。

干燥物系解析理论研究进展

干燥是含湿物料与有限介质两个独立物系,在限定的工艺条件下,自发进行能量传递和转换的过程。它隶属热力学范畴,而又不同于一般的热力过程,在物系边界存在诸多错综复杂的随机因素交互作用,使得基于热力学熵参数无法对实际过程的能效进行实时的定量评价。基于传递定律建立扩散模型,得不到传递系数严格意义的数学解,存在微积分结果偏离实际较远的情况;基于反应工程原理建立干燥动力学模型,存在指前因子,活化能,机理函数等待定的物理量,实际应用存在很大的局限性。如何从理论上完整地解析出实际过程,得到其分析解是热力学应用技术基础科学研究领域自古以来的重大理论难题。近十几年,笔者从非均相系热力学基础和干燥㶲分析入手,以干燥㶲传递和转换时的自由能消耗为统一尺度,以水分活度为一切干燥物系的共同属性,揭示了干燥物系固有特征函数及其理论解,丰富了热力学应用技术基础理论。该文从干燥物系解析理论发展的历史现状,阐释揭示物料干燥理论过程、评价工艺装备能效的解析理论与方法并指明其应用与发展的技术途径,为揭示物系传递机理、评价工艺装备系统能效、实现干燥过程自适应控制和制订科学的工艺能效评价标准提供参考。

慢性肾功能衰竭腹膜透析患者发生肾性贫血的风险及其预测模型构建

目的探究慢性肾功能衰竭(CRF)腹膜透析患者发生肾性贫血的风险,并建立风险预测模型。方法回顾性分析2018年7月至2021年6月吉安市中心人民医院收治的106例行腹膜透析CRF患者的临床资料,根据肾性贫血发生情况分为肾性贫血组与未发生肾性贫血组,各53例。比较两组肾性贫血相关因子水平[红细胞计数(RBC)、血红蛋白(Hb)、白蛋白(Alb)、C反应蛋白(CRP)、转铁蛋白(TRF)、转铁蛋白饱和度(TSAT)、血清总铁结合力(TIBC)、不饱和铁结合力(UIBC)],Logistic回归分析腹膜透析患者发生肾性贫血的危险因素,建立预测模型并评估其预测效能。结果肾性贫血组RBC、Hb、Alb、CRP、TRF、TSAT、TIBC、UIBC水平均低于未发生肾性贫血组,差异有统计学意义(P<0.05)。Logistic回归分析显示,TRF、TIBC、UIBC是发生肾性贫血的危险因素(P<0.05),ROC曲线显示AUC分别为0.815、0.919和0.826。肾性贫血风险预测模型验证结果显示,74例患者TRF、TIBC、UIBC的准确度为85.1%、86.5%、89.2%。结论TRF、TIBC、UIBC是发生肾性贫血的危险因素,且风险预测模型对肾性贫血发生预测效能较好。

核心结合因子相关成人急性髓系白血病患者总生存临床预测模型的建立

目的:分析影响核心结合因子相关成人急性髓系白血病(CBF-AML)患者总生存(OS)的因素,并建立预测模型。方法:回顾性分析2015年5月至2021年7月在郑州大学第一附属医院新诊断的216例CBF-AML的临床资料。将患者按照7∶3随机分成训练集和验证集。采用Cox回归模型对影响OS的临床因素进行分析。采用逐步回归建立最优模型,画出列线图。使用受试者工作特征(ROC)曲线、校准曲线和决策曲线分析(DCA)评估模型性能。结果:年龄≥55岁、外周血原始幼稚≥80%、AML1-ETO、KIT突变被确定为OS的独立预后不良因素。训练集和验证集3年ROC下面积分别为0.772、0.722;校正曲线预测值与实测值具有较好一致性。DCA表明此模型性能优于单一因素。结论:该预测模型简便易行,可有效预测CBF-AML的OS,为治疗决策提供依据。

R环结合蛋白对肺腺癌患者预后的预测及药物敏感性分析

目的:研究R环结合蛋白对肺腺癌患者预后及抗肿瘤药物敏感性的影响,为R环在肿瘤生物学中的调控机制研究及临床决策提供科学依据。方法:从R环结合蛋白质组学研究文献及相关数据库中获取R环结合基因,以癌症基因组图谱数据库中的403例肺腺癌患者的数据作为训练集,以基因表达综合数据库中GSE14814与GSE31210两个数据集的数据作为验证集,采用加权基因共表达网络分析(WGCNA)、最小绝对收缩和选择算子(LASSO)、多因素Cox回归分析逐步筛选具有独立预后预测作用的临床变量及R环特征基因,maftools分析R环特征基因的突变特征,构建基于R环特征基因的风险评分和列线图模型,验证该模型对高、低风险患者预后预测的能力及其对抗肿瘤药物治疗敏感性的影响。最后采用实验验证R环特征基因表达对抗肿瘤药物敏感性的影响。结果:收集整理得到R环特征基因1551个,WGCNA筛选得到显著影响临床表型的R环基因78个,LASSO回归分析保留R环基因14个,多因素Cox回归分析筛选到3个与患者预后密切相关的R环特征基因(HEXIM1、GLI2、PLEC)和一个临床变量(肿瘤分级),根据各参数的回归系数构建预后模型和列线图模型。Kaplan-Meier生存分析显示,高风险组患者预后明显差于低风险组(P<0.01)。时间依赖受试者工作特征曲线表明,该模型在训练集和验证集列队中均具有较好的预测能力。抗肿瘤药物敏感性预测结果表明,高风险组患者对肺癌化疗和靶向治疗药物的敏感性更低。PLEC基因沉默实验表明抑制PLEC的表达能增强表皮生长因子受体野生型非小细胞肺腺癌细胞株对吉非替尼的敏感性。结论:R环结合蛋白是肺腺癌预后的风险因素,联合临床信息和R环特征基因可以有效预测肺腺癌患者的预后,靶向上述R环特征基因可能对提高患者存活率具有重要意义。

干湿循环对混凝土氯离子结合能力的影响研究

海洋环境下氯离子侵蚀是钢筋混凝土耐久性破坏的主要因素之一,目前普遍运用的基于Fick第二定律解析解的氯离子浓度预测方法是基于氯离子不与混凝土结合的假设。但在实际情况中,氯离子可以通过化学结合与物理吸附的方式与混凝土结合,混凝土对氯离子的结合作用会降低自由氯离子浓度,从而降低氯离子扩散速率和钢筋前沿的氯离子浓度累积量。文章进行了8组不同干燥时间比和5个暴露时间点的干湿循环试验,研究干湿循环作用和暴露时间对混凝土氯离子结合能力的影响。分别采用线性吸附理论和Freundlich吸附理论对试验数据进行拟合分析,预测氯离子的结合能力。结果表明两种吸附理论表达出的氯离子结合能力均随着干燥时间比的增加而降低,但Freundlich吸附理论的预测结果更为准确,故选取该理论建立了干燥时间比、暴露时间影响下的氯离子结合能力表达式。根据建立的氯离子结合能力公式,建立合理描述氯离子传输特性的数值模型。并通过数值模拟比较考虑氯离子结合能力的氯离子传输模型与基于Fick第二定律解析解的氯离子扩散模型的差异。

基于高频超声定量参数及临床相关资料构建早产儿主动脉瓣二瓣化畸形发病预测模型

目的 基于高频超声定量参数及临床相关资料构建早产儿主动脉瓣二瓣化畸形(BAV)发病预测模型。方法 选取2020年1月—2022年12月收治的86例BAV早产儿作为研究组,按照1︰1比例选取86例无BAV的早产儿作为对照组。统计2组临床资料、高频超声定量参数及表现,构建随机森林模型和多因素Logistic回归方程模型,采用受试者工作特征(ROC)曲线分析2种模型预测早产儿BAV发病的效能。结果 2组早产儿25-羟基维生素D、心肌型脂肪酸结合蛋白(H-FABP)、心肌肌钙蛋白I(cTnI)、心肌型肌酸激酶同工酶、家族史、高频超声主动脉瓣正向最大血流速度(V_(max))、高频超声跨瓣压差、高频超声主动脉瓣狭窄、高频超声主动脉瓣反流、高频超声主动脉受累扩张及早产儿母亲年龄比较差异有统计学意义(P<0.01)。采用随机森林算法构建早产儿BAV发病预警模型,根据平均准确度下降程度进行重要性排序,从高到低依次为早产儿高频超声V_(max)、高频超声跨瓣压差、高频超声主动脉瓣狭窄、H-FABP、cTnI、家族史,该模型预测早产儿BAV发病的曲线下面积(AUC)为0.974,敏感度为0.954,特异度为0.988;多因素Logistic回归方程显示,早产儿高频超声V_(max)、高频超声跨瓣压差、高频超声主动脉狭窄及H-FABP、家族史、cTnI是早产儿BAV发病的影响因素(P<0.01),据此构建的多因素Logistic回归方程预测模型预测早产儿BAV发病的AUC为0.924,敏感度为0.919,特异度为0.930。结论 基于高频超声定量参数及临床相关资料构建早产儿BAV发病预警模型具有可行性,且预测效能良好,能为临床诊疗工作提供参考。

合作社激励与约束规制对其成员使用生物农药的影响

本文基于四川省541份柑橘合作社成员微观调研数据,采用IPWRA模型进行实证分析,探究合作社异质性规制对其成员生物农药使用的影响及其差异,以期为提升合作社规制效率、促进农户使用生物农药提供对策建议。结果表明:合作社规制对成员生物农药使用具有显著正向影响,合作社约束性规制的促进作用更加明显;合作社激励性规制与约束性规制存在叠加效应;合作社激励性规制对年龄和种植规模较小的成员促进效果更加明显,合作社约束性规制对种植年限较短的成员的影响更大。基于此,提出两点建议:第一,多元化合作社规制,恩威并施,构建以监督约束为主、多元激励为辅的合作社规制体系;第二,分类施策,对于年轻的小规模经营户,合作社的规制要以激励为主;对于刚从事种植的成员,合作社的规制要以约束性为主。

粗糙度对硅烷环氧杂化树脂涂层附着力影响

目的研究基体粗糙度对涂层附着力的影响。方法选取LY12铝合金、硅烷环氧杂化树脂涂层为研究对象,开展不同粗糙度下涂层与基体间附着力的影响关系研究,确定粗糙度对涂层机械附着力的微观作用机理,并通过有限元软件ABAQUS6.12建立硅烷环氧杂化树脂涂层/铝合金基体的界面损伤粘结模型,模拟涂层/基体界面从起始剥离到完全开裂的过程,并通过对比分析不同基体粗糙度与涂层S22应力值的关系,从而验证基体表面粗糙度对涂层附着力的作用机理为机械互锁理论。结果随着基体表面粗糙度的增加,涂层的附着强度逐渐增大,但二者并不呈线性关系,当硅烷环氧杂化树脂涂层的厚度为(30±2)um时,铝合金基体表面粗糙度Ra=(3.6~4.8)um范围内,可保证涂层较好的附着力。结论凹凸不平的基体表面可增大涂层/基体间的接触面积,可以使涂层与基体像铆钉一样牢固结合,从而提高涂层与基体的吸附作用力。