摘要:
The p-terphenyl derivatives of the formula shown below are useful in preparing practical ferroelectric liquid crystalline compositions. The derivatives exhibit excellent chemical stability and display the chiral smectic C or smectic C phase over a wide temperature range. ##STR1## wherein each of R.sub.1 and R.sub.2 is a straight or branched chain alkyl group having 1-18 carbon atoms; each of Y and Z is a single bond, O, COO or OCO; and any two of X.sub.1, X.sub.2, and X.sub.3 are fluorine atoms and the remainder is a hydrogen atom.
摘要翻译:下面所示公式的对三联苯衍生物可用于制备实际的铁电液晶组合物。 该衍生物表现出优异的化学稳定性,并在宽温度范围内显示手性近晶C或近晶C相。 (1)其中R1和R2各自为具有1-18个碳原子的直链或支链烷基; Y和Z各自为单键,O,COO或OCO; X 1,X 2和X 3中的任意两个为氟原子,其余为氢原子。
摘要:
New p-terphenyl derivatives useful as components for preparing practical ferroelectric liquid crystalline compositions and excellent in chemical stability, as well as liquid crystalline compositions containing at least one of the p-terphenyl derivatives.
摘要:
An optically inactive cyclobutanecarboxylic acid derivative of the general formula ##STR1## wherein R.sup.1 is a hydrogen atom or a straight or branched chain alkyl group having 1-14 carbon atoms, R.sup.2 is a straight or branched chain alkyl group having 1-14 carbon atoms, X.sup.1 and X.sup.2 independently represent hydrogen or fluorine atoms, as well as a liquid crystalline composition containing at least one such derivative.
摘要:
A ferroelectric liquid crystal composition comprising a specific fluorophenyl compound (I) and a specific pyrimidine compound (II) and optionally a specific benzoate compound (III), which exhibits a high-speed response in room temperature and is useful for liquid crystal display devices of large capacity.
摘要:
A new biphenyl compound which is chemically stable and possesses practically excellent properties as a component for preparing ferroelectric smetic liquid crystalline compositions as well as a new liquid crystalline composition containing this compound.
摘要:
An opening and closing device that opens and closes an access port opened from a substantially cylindrical working platform disposed inside a reactor vessel and used to access a nozzle stub of the reactor vessel from the inside of the working platform, the opening and closing device includes: a cover that is slidable along an outer peripheral surface or an inner peripheral surface of the working platform from a closing position where the access port is closed to an opening position where the access port is opened; and moving device for sliding the cover.
摘要:
An air bag device is provided which includes:a first restraining member, of which one end is attached to an inflator side inside the air bag body and the other end is secured to the occupant side of the air bag body, and which at first restrains the air bag body from being inflated toward the occupant past a first predetermined amount in the inflation of the bag body; anda second restraining member to restrain the air bag body from being inflated toward the occupant past a second predetermined amount greater than the first predetermined amount when a tensile force exceeding a predetermined value acts on the first restraining member in the inflation of the air bag body.The air bag body is at first blocked from inflating toward the occupant for a desired inflation shape, followed by inflation again of the bag body toward the occupant to provide the final desired inflation shape.
摘要:
An overlock prevention mechanism for a vehicle acceleration sensor used on a retractor for a seat belt device in a vehicle comprises an inertial body which moves in response to acceleration of the vehicle; a sensor casing on which the inertial body is mounted; a ratchet wheel which locks the retractor; and a composite sensor arm assembly comprising an upper sensor arm which is adapted to be engaged with the ratchet wheel and a lower sensor arm which is adapted to come into contact with the inertial body to transmit the movement of the inertial body to the upper sensor arm; and when the upper sensor arm is interlocked with the ratchet wheel, the lower sensor arm is forced toward the inertial body by a force activated from the ratchet wheel and transmitted through the upper sensor arm, so that the inertial body is pressed to the sensor casing against movement.
摘要:
A reactor vessel that performs work inside a nozzle stub of the reactor vessel, including a platform unit that is provided at an upper portion inside the reactor vessel and includes a substantially cylindrical side wall portion and a bottom portion blocking the lower end of the side wall portion; an access window that is provided at the side wall portion of the platform unit an access window moving device that opens and closes the access window; a working device; and a control device that is provided at the outside of the reactor vessel and controls the access window moving device and the working device, wherein the control device drives the access window moving device to open the access window, drives the working device to perform work inside the nozzle stub, and then drives the access window moving device to close the access window after the performance of the work.
摘要:
An information search device capable of selecting topic search engines (i.e., search engines that focus on specific topics) that are appropriate to a user's search keywords when searching the Web on the Internet. Terms having relevance to each topic search engine are collected from, for example, the Web, and a DB selection index for selecting search engines is produced in advance by an index generator. When a search keyword is supplied from a user, terms having relevance to the search keyword are acquired from a general-purpose Web search engine by means of a query expansion unit. The thus-acquired terms are matched with terms stored in the DB selection index, and topic search engines having a high incidence of matching are presented to the user.