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This research explored the possibility and the biological effects of construction of a electro-bioactive coating on the dental implant surface using electrically conductive polymer-polypyrrole . This paradigm proved to be very powerful in combining the principles of surface engineering with electromagnetic therapy in promoting dental implant osseointegration.

本研究探索了利用PPy构建基金属种植体表面电生物活性层的可行性,并研究了其对体外培养成骨细胞生物学特征的影响,为基种植体的表面改性和生物活性设计提供了一种新思路。

Of the late two years,in order to find out a kind of dental implant ing materialwhich would possess both the very good properties of biological compatibility,the chemical compatibility and the mechanical compatibility,an animal experi-mental preselection was accomplished by our research team with six kinds of im-planting material chosen from four main sorts of oral implant ing material(met-al,ceramic,high polymer and carbon),As the result of the Preselection,thematerial……bio-ceramic was chosen by ...

为了寻求生物相容性、化学相容性和力学相容性均好的种植材料,在口腔四大类种植材料(金属、陶瓷、碳素、高分子)中,选用6种材料作了动物实验预选。根据预选结果,选定以生物陶瓷为主攻方向,从而研制成功锆磷灰石陶瓷,以之进行了理化性能、生物学性能、及动物实验考查,合平种植要求。并以考查结果与合金、多晶氧化铝、单晶氧化铝、合金喷涂氧化铝、低温各向同性碳、聚砜种植作了比较,主要性能均较其它几种比较材料为优。经临床初试,锆磷灰石陶瓷的种植效果也较好,其界面为骨性结合。

The influences of forming solid solution, generating new compound and addition of flux on sinterability, phase-structure and microwave dielectric properties of zinc titanate were analyzed.

酸锌介电陶瓷的改性研究进行了综述,分析了形成固溶体、生成新的化合物和添加助熔剂对酸锌陶瓷的烧结性、相结构和微波介电性能的影响。

We transformed RMgBr into R-Ti derivatives with the production of byproduct MgBrO~(i-Pr at the same time, but we didn\'t need romove the Mg salt by centrifugation or chelating reagents, for bis[2-(N,N-dimethylamino)ethyl] ether could chelate with Mg atom and thereby reduced the Louis acidity of Mg salt, so we used R-Ti derivatives produced in situ to alkylate the aldehydes induced by BINOL-Ti complexes..

我们通过利用TiO~(i-Pr_4使格氏试剂转化成烷基,同时产生具有亲核加成促进作用的副产物MgBrO~(i-Pr,由于BDMAEE能与MgBrO~(i--Pr络合降低其路易酸活性,所以不需要离心或者借助络合试剂完全除去镁盐,而使用原位生成的烷基在BINOL-Ti诱导下对醛进行不对称加成。

Monophenyltin trichloride reacts withdicarbonyl dicyclopentadienyl titanium immediately at room temperature, but no ti-tanium-tin complex produced, and the products were diphenyltin dichloride〓 and tin or stannous Chloride. When diaryltin dihalides were used, only the chlorides and bromides reacted with 〓form the complexes containing titaninm-tin bond,〓. but the corresponding iodide complex was not found. This reaction is Sensitive totemperature,when the temperature is belw 10℃,the reaction hardly takes place,but as the temperature is above 25℃,more 〓 will be found and the reactionbecome more complex.

Ph-SnC〓室温下即可与Cp〓迅速反应,但不生成含一锡链的化合物,而是生成Ph〓和Sn或Sn〓二芳基二卤化锡化物中,只有氯化物和溴化物才能和〓反应生成含〓锡键的化合物〓相应的碘化物则不行,而且反应对温度比较敏感,低于10℃,反应几乎不能进行,而高于25〓,则会生成更多的〓,在回流条件下得不到含〓锡键的化合物,只能得到分解产物,〓和Sn或〓。

However, in 2007, titanium sponge market prices began to drop, the company "prospectus" disclosure of the average annual price of titanium sponge 90.98 yuan/kg, down 44.90 percent over the previous year, while the sponge Titanium market prices also led to the company's operating results in 2007 a substantial decline in net profit in 2006 than the 69.4 percent year-on-year decline.

然而,在2007年,海绵市场价格开始下降,该公司&招股章程&披露的平均海绵九十点九八元公斤/年的价格,下降44.90个百分点上年,而海绵市场价格也导致该公司在2007年的经营业绩的百分之69.4,比去年同期下降,在2006年的纯利润大幅下降。

objective:to explore the effects of out cavity single slip knot technique in non titanium clip two hole method laparoscopic cholecystectomy.methods:to analyzed the clinical data of 62 patients underwent two hole method lc with out cavity single slip knot technique.results:all the operations were finished successfully without conversion.the mean operation time and hospitalization were 55 min and 4d respectively.conclusions:the two hole lc with out cavity single slip knot technique has the advantage of firm and reliable ligation,low operation expense,non titanium clip stay in the body,and avoiding of bile leakage due to titanium clip falling off.

目的:探讨腔外单滑结技术在无夹二孔法腹腔镜胆囊切除术中的效果。方法:应用腔外单滑结技术行二孔法lc 62例。结果:患者均行lc,无中转开腹,手术平均时间55min,平均住院4d。结论:无夹腔外单滑结法lc具有结扎可靠,手术费用低,并可消除因夹留置体内或夹闭不全造成脱落、胆漏等其他并发症。

The existence ofpolar nanoregions dramatically influences the extrinsic dielectric nonlinearityof paraelectric phase. 5 Slow relaxations of field induced piezoelectricresonance of paraelectric barium stannate titanate were observed after eitherapplying or removing a DC bias field. This phenomenon is attributed to slowspace charge dipoles formed by injected homocharges and validated by theobservation of a negative piezoelectric constant. Isothermal study ondielectric constant and discharging current after application or removal of astep field were performed. The relaxation laws in ferroelectric andparaelectric phases are different. The transportation of homocharges arebelieved to be responsible for the strong relaxation behavior in paraelectricphase. Domain wall can trap space charges thus the relaxation in ferroelectricphase is relatively weak. Abnormal phenomena, such as slim-waisted hysteresisloops, abnormal C-V curves and clockwise reversible hysteresis loops observedin barium stannate titanate ceramics, were attributed to pinning of gatheredpoint defect on domain walls.

5研究了直流电场施加和撤除引起的锡酸钡顺电相场诱压电谐振慢弛豫现象,认为这是同极性空间电荷注入形成空间电荷慢偶极子导致的,观察到的负压电常数证实了这个观点;研究了等温条件下阶跃电压作用下介电常数和放电电流的慢弛豫现象,发现锡酸钡陶瓷的铁电相和顺电相呈现不同的宏观性能时间依赖规律,认为是同极性空间电荷的输运过程导致了顺电相样品呈现强的弛豫行为,铁电相中存在畴壁捕获空间电荷的机制因而其弛豫行为较弱;研究了锡酸钡陶瓷中束腰电滞回线、反常 C-V 曲线和顺时针可逆电滞回线等反常现象,将其归因于点缺陷的聚集对铁电畴畴壁的钉扎作用,多次电场循环有助于解除这种钉扎状态,减弱反常特征。

Nickel-Titanium instruments have become widely used in the endodontic treatment. However, their unexpected separation was a serious concern in endodontics. To date, no scientific methods have been developed to evaluate the functional lifespan of Ni-Ti instruments. In this study, we used resonance frequency analysis to nondestructively detect the fatigue life of Ni-Ti instruments to determine the feasibility of this technique for use in the clinic.

合金根管锉已经广泛的使用在牙髓病的治疗上,但其无预警的断裂也是令牙医师关心的问题,之前并无一科学性的方法来评估镍合金根管锉的寿命,而本研究室利用自然频率的分析方式对镍合金根管锉做非破坏性的疲劳检测,确定此方式可行且在临床上有应用的价值。

A commercial test on Panzhihua fine ilmenite using emulsified tall oil as collector has been undertaken.

用乳化塔尔油作捕收剂浮选攀枝花的微细粒级铁矿的工业试验,获得精矿品位 4 6.4 4 %,回收率 60 。0 2 %,表明乳化塔尔油是攀枝花微细粒铁矿较合适的捕收剂。

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We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称;三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起,称之为挽歌体诗人或者史诗诗人,他们被称为诗人,似乎只是因为遵守格律写作,而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。

This is not paper type of business,it's people business,with such huge money involved.

这不是纸上谈兵式的交易,这是人与人的业务,而且涉及金额巨大。