小众珠宝:我自一派成清流

近日,出席某活动的范冰冰佩戴了一副引人瞩目的耳环,两个小毛球十分抢眼。一向大牌傍身的范冰冰这次选择了一个小众珠宝品牌——来自纽约首饰品牌Tuleste。周冬雨不久前戴的这对“星月”组合也是来自Tuleste。近年来,珠宝界掀起了一股小众风潮,一些价格亲民、款式俏皮的小众原创设计师珠宝品牌受到了众多年轻女明星的青睐。小众珠宝逐渐被关注。珠宝的“小势力”圈子玛丽莲·梦露曾说过：“钻石是女孩最好的朋友。”珠宝,永远没有女人会抗拒。珠宝也讲圈子。有血统高贵、

中技系的“负资产”

野心勃勃的成清波其后目光落到了上市公司,通过向其溢价注入盈利质量低下的资产,转移经营风险,同时实现套利。多年下来,中技系相关投资者涉及面广,数量众多,均无法获得补偿。

“科举家族”定义商榷

就张杰先生对"科举家族"的定义提出异议,认为定义中的"聚族而居"应改换成"族员间有较强的血缘认同感"为宜,即异地进士若能认族归宗,即使两人世居不同的省府县,亦视他们为同一家族族员,突破必须世代聚居一地方可视为同一家庭的定义局限。

Effects of Rosiglitazone and Serum on the Expressions of PPARα and PPARγ Genes in the Induced Differentiation Process of Pig Preadipocyte

[Objective] The research aimed to discuss the effects of rosiglitazone and serum on the expressions of PPARα and PPARγ genes in the induced differentiation process of pig preadipocyte.[Method] The pig preadipocyte was separated by using the collagenase digestion method.Three kinds of different differentiation culture solutions were used to induce the differentiation of pig preadipocyte.The oil red O staining extraction method was used to contrast the influences of different differentiation culture solutions on the variation of cellular fat content in the differentiation process.Moreover,the variation trends of PPARα and PPARγ expressions in the cellular differentiation process in the different differentiation culture solutions were detected by the real-time quantification PCR.[Result] The cellular fat accumulation was the fastest in MII which contained rosiglitazone and was the slowest in MI which didn＇t contain rosiglitazone.Rosiglitazone could significantly increase the expression of PPARγ gene（P0.01）,but had the certain inhibition effect on the expression of PPARα gene,which wasn＇t significant.The serum had the extremely significant up-regulation effect on the expression of PPARγ gene（P0.01）,but had the extremely significant down-regulation effect on the expression of PPARα gene（P0.01）.[Conclusion] Rosiglitazone could greatly promote the expression of PPARγ gene,which increased the cellular fat deposition.Maybe the activator of PPARγ gene existed in the serum,and the inhibitor of PPARα gene existed simultaneously.

“造声势”以后

每当一项中心工作开展之初,与之相应的总要“造”一“造”“声势”。为了让人们认清意义,端正态度,积极响应,以利工作顺利开展,这样做当然是必要的。试想,诸如计划生育、维护治安、整顿交通秩序、全民办教育、保护森林、打击经济犯罪等等工作,倘若冷冷清清做起来,恐怕效果就要大打折扣。

对完善农村土地承包制的调查与思考

对完善农村土地承包制的调查与思考张焕春，肖成清随着农村商品经济的发展，越来越多的农民逐步向非农产业转移。可是，这些已不再从事务农或主要不再从事务农的农民，虽身在工厂、城镇，却仍与土地保持若千丝万缕的联系。出于户籍制度的限制而把土地作为唯一的社会保障的...

精诚由中 情神并茂——《听李岚清讲音乐与人生》赏析

5月30日,重庆日报头版发表记者李鹏采写的《听李岚清讲音乐与人生》。这是一条难得一见的精诚由中、情神并茂的好新闻。在一般人的想像中,个人讲座难免枯燥乏味,有关讲座的报道也多半抄抄摘摘,乏彩平庸。即如李岚清同志的这场讲座,本市某报写的就是:"

苹果大树换头改接七字歌

改革开放好政策,群众致富道路多。山区苹果是 优势,优质高效为上策。老劣品种效益低,速换良种莫畏缩。换头工作早准备,防止换时乱阵脚。良种接穗是关键,优种树上去选择。接穗采后保管好,冻烂混杂要不得。嫁接季节三月份,早了晚了难成活。

杨树溃疡病的防治措施

杨树渍疡病作为一种杨树常发病,危害越来越严重。尤其表现在杨树育苗上,有的育苗地几乎每株皆病,而且病情非常厉害。必须引起充分重视。

巴山奇茶——生奇雀舌

天道者道法自然,茶道者品鉴天地。天道即茶道,以茶悟天,感四时变换,淡泊于心。巴山有奇茶,手工采摘芽叶于明前,片片滴露,叶叶流香。承制后,其形若山雀之舌,其香浸肺入腹,其色碧翠欲滴,其味唇此生花。好事人曰:芳茶冠六清,溢味播九州。好物者曰:只缘清香成清趣,全因浓酽有浓情。

燈亮了——上海首家国有企业转制内幕

走廊裏只留下一溜燈罩這是一家具有30多年曆史的老廠,又是一家只有202名職工的小廠。沿着狹長擁擠的山海關路菜場走,只見在一小巷的水泥牆上寫着:"上海燈具廠→"。箭頭爲我指出了它的方向。如果没有箭頭,我無法想象人們怎樣在數不盡的無名小巷中找到它。午後的陽光彌漫着。這兒是上海典型的待改造的老居民區。從空中俯視,私家平房的玄色屋頂密密地連成一大片。上海燈具廠就静静地擠在這片黑屋頂之中。特殊的環境,帶來特殊的故事。寫下它們時,我驚訝于小廠特有的顽强生存能力。故事之一。工廠廠房與居民私房肩并肩挨着,最近處才隔十來米。夜裏廠房二樓走廊的燈一開,光線就直射入旁邊居民家中。不久,被整夜照醒的居民怒氣衝衝地找廠長責問。王怡怡廠長聽畢,只能苦笑着派人把走廊上所有的燈泡都拆下來,孤伶伶只留下一溜燈罩。故事之二。處于私房包圍之中。

原汁原味潮州菜

潮州菜的历史由来已久,除了耳热能详的狮头鹅、护国菜、潮州糜,潮州当地依旧传承着老祖宗留下的四季轮换的菜式,其中又尤善烹制以蔬果为原料的素菜,大芥菜、番薯叶、苋菜、通心菜、发菜、竹笋等,几乎每家每户都知道怎样将这些原料制作成清淡味美的佳肴。多样的粿品,酬神的符圆,在潮州,无论是高档酒楼还是风味菜馆,但凡出得厨房,上得餐桌的无一不是保持着潮州莱原汁原味特色的精品。

Tuning of the textural features and acidic properties of sulfated mesoporous lanthana-zirconia solid acid catalysts for alkenylation of diverse aromatics to their corresponding α-arylstyrenes

The textural features and acidic properties of sulfated mesoporous lanthana‐zirconia solid acids （SO42？/meso‐La0.1Zr0.9Oδ） were efficiently tuned by modifying the conditions used to prepare the meso‐La0.1Zr0.9Oδcomposites, such as the molar ratio of the template to La and Zr metal ions （Nt/m）, molar ratio of ammonia to La and Zr metal ions （Na/m）, hydrothermal temperature （Thydro）, and hy‐drothermal time （thydro）. The effect of the textural features and acidic properties on the catalytic performance of solid acid catalysts for alkenylation of p‐xylene with phenylacetylene was investi‐gated. Various characterization techniques such as N2 physisorption, X‐ray diffraction, NH3 temper‐ature‐programmed desorption, and thermogravimetric analysis were employed to reveal the rela‐tionship between the nature of catalyst and its catalytic performance. It was found that the catalytic performance significantly depended on the textural features and acidic properties, which were strongly affected by preparation conditions of the meso‐La0.1Zr0.9Oδcomposite. Appropriate acidic sites and high accessibility were required to obtain satisfactory catalytic reactions for this reaction. It was also found that the average crystallite size of t‐ZrO2 affected by the preparation conditions had significant influence on the ultrastrong acidic sites of the catalysts. The optimized SO42？/meso‐La0.1Zr0.9Oδcatalyst exhibited much superior catalytic activity and coke‐resistant stabil‐ity. Moreover, the developed SO42？/meso‐La0.1Zr0.9Oδcatalyst demonstrated excellent catalytic per‐formance for alkenylation of diverse aromatics with phenylacetylene to their correspondingα‐arylstyrenes. Combining the previously established complete regeneration of used catalysts by a facile calcination process with the improved catalytic properties, the developed SO42？/meso‐La0.1Zr0.9Oδ solid acid could be a potential catalyst for industrial production ofα‐arylstyrenes through clean and atom efficient solid‐acid‐mediated Friedel‐Crafts alkenylation of diverse aromatics with phenylacetylene.

Simultaneous Optimization of Synthesis and Scheduling of Cleaning in Flexible Heat Exchanger Networks

A novel methodology is presented for simultaneously optimizing synthesis and cleaning schedule of flexible heat exchanger network(HEN)by genetic/simulated annealing algorithms(GA/SA).Through taking into account the effect of fouling process on optimal network topology,a preliminary network structure possessing two-fold oversynthesis is obtained by means of pseudo-temperature enthalpy(T-H)diagram approach prior to simultaneous optimization.Thus,the computational complexity of this problem classified as NP(Non-deterministic Polynomial)-complete can be significantly reduced.The promising matches resulting from preliminary synthesis stage are further optimized in parallel with their heat exchange areas and cleaning schedule.In addition,a novel continu- ous time representation is introduced to subdivide the given time horizon into several variable-size intervals according to operating periods of heat exchangers,and then flexible HEN synthesis can be implemented in dynamic manner.A numerical example is provided to demonstrate that the presented strategy is feasible to decrease the total annual cost(TAC)and further improve network flexibility,but even more important,it may be applied to solve large-scale flexible HEN synthesis problems.

Structural change of molybdenum sulfide facilitates the electrocatalytic hydrogen evolution reaction at neutral pH as revealed by in situ Raman spectroscopy

Molybdenum sulfides are promising electrocatalysts for the hydrogen evolution reaction(HER).Sand Mo‐related species have been proposed as the active site for forming adsorbed hydrogen to initiate the HER;however,the nature of the interaction between Mo centers and S ligands is unclear.Further,the development of cost‐effective water‐splitting systems using neutral water as a proton source for H2evolution is highly desirable,whereas the mechanism of the HER at neutral pH is rarely discussed.Here,the structural change in the Mo?Mo and S?S species in a synthesized molybdenum sulfide was monitored at neutral pH using in situ electrochemical Raman spectroscopy.Analysis of the potential dependent Raman spectra revealed that the band assigned to a terminal S?S species emerged along with synchronized changes in the frequency of the Mo?Mo,Mo3?μ3S,and Mo?S vibrational bands.This indicates that Mo?Mo bonds and terminal S?S ligands play synergistic roles in facilitating hydrogen evolution,likely via the internal reorganization of trinuclear Mo3?thio species.The nature and role of metal‐ligand interactions in the HER revealed in this study demonstrated a mechanism that is distinct from those reported previously in which the S or Mo sites function independently.

Effects of chromium nanoparticle dosage on growth,body composition,serum hormones and tissue chromium in Sprague-Dawley rats

This 6-week study was conducted to evaluate the effects of seven different levels of dietary chromium (Cr) (0,75,150,300,450,600,and 1200 ppb Cr) in the form of Cr nanoparticle (CrNano) on growth,body composition,serum hormones and tissue Cr in Sprague-Dawley (SD) rats. Seventy male SD rats (average initial body weight of (83.2±4.4) g) were randomly assigned to seven dietary treatments (n=10). At the end of the trial,body composition was assessed via dual energy X-ray absorptiometry (DEXA). All rats were then sacrificed to collect samples of blood,organs and tissues for determination of serum hormones and tissue Cr contents. The results indicated that lean body mass was significantly increased (P<0.05) due to the addition of 300 and 450 ppb Cr from CrNano. Supplementation of 150,300,450,and 600 ppb Cr decreased (P<0.05) percent body fat significantly. Average daily gain was increased (P<0.05) by addition of 75,150,and 300 ppb Cr and feed efficiency was increased (P<0.05) by supplementation of 75,300,and 450 ppb Cr. Addition of 300 and 450 ppb Cr decreased (P<0.05) the insulin level in serum greatly. Cr contents in liver and kidney were greatly increased (P<0.05) by the addition of Cr as CrNano in the dosage of from 150 ppb to 1 200 ppb. In addition,Supplementation of 300,450,and 600 ppb Cr significantly increased (P<0.05) Cr content in the hind leg muscle. These results suggest that supplemental CrNano has beneficial effects on growth performance and body composition,and increases tissue Cr concentration in selected muscles.

Ceria-modified hierarchical Hβ zeolite as a robust solid acid catalyst for alkenylation of p-xylene with phenylacetylene

A ceria‐modified hierarchical Hβzeolite was prepared by a desilication‐dealumination procedure followed by ceria modification.The catalytic performance of the ceria‐modified and unmodified hierarchical Hβzeolite catalysts for alkenylation of p‐xylene with phenylacetylene was investigated.Various characterization techniques,including X‐ray diffraction,X‐ray fluorescence,nitrogen adsorption‐desorption,and NH3temperature‐programmed desorption,were used to examine the structure‐performance relationships.Our results show that the optimized ceria‐modified hierarchical Hβzeolite catalyst demonstrated higher catalytic activity,selectivity,and stability for alkenylation of p‐xylene with phenylacetylene than those of pristine Hβzeolite.This performance was attributed to more acidic sites and improved accessibility to active sites through larger pores,together with a higher mesoporous surface area and volume resulting from the hierarchical pore architecture and ceria modification.Thus,our5wt%CeO2‐Hβ‐B0.2A0.2catalyst shows great potential for producing alkenyl aromatics through solid acid catalyzed alkenylation.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved

Inverse synthetic aperture radar imaging based on sparse signal processing

Based on the measurement model of inverse synthetic aperture radar (ISAR) within a small aspect sector,an imaging method was presented with the application of sparse signal processing.This method can form higher resolution inverse synthetic aperture radar images from compensating incomplete measured data,and improves the clarity of the images and makes the feature structure much more clear,which is helpful for target recognition.The simulation results indicate that this method can provide clear ISAR images with high contrast under complex motion case.