摘要:
[Problem] Mobile electronic equipment is often dropped during use or transport, and the soldered joints of electronic parts sometimes peel off due to the impact when dropped. In addition, they undergo heat cycles in which internal coils, resistors, and the like generate heat and soldered joints increase in temperature during operation of electronic equipment and cool off during periods of non-use. With a conventional Sn-Ag base lead-free solder, the impact resistance and resistance to heat cycles of minute portions such as solder bumps were not adequate. The present invention provides a lead-free solder alloy, bumps of which have excellent impact resistance and resistance to heat cycles. [Means for Solving the Problem] The present invention is a lead-free solder alloy comprising 0.1 - less than 2.0 mass % of Ag, 0.01 - 0.1 mass % of Cu, 0.005 - 0.1 mass % of Zn, and a remainder of Sn, to which Ga, Ge, or P may be added, and to which Ni or Co may be further added.
摘要:
It is intended to provide a means of preventing a decrease in the activity of a protein due to freezing. Namely, a method of preventing a decrease in the activity of a protein due to freezing which comprises adding a polypeptide having the following amino acid sequence (I) to the aimed protein to be frozen; and use of a polypeptide having the following amino acid sequence (I) in producing an activity decrease preventing agent for preventing a decrease in the activity of a protein due to freezing: (I) (SEQ ID NO:1) Ser-Ser-Thr-Gly-Ser-X1-Ser-X2-Thr-Asp-X3-X4-X5-X6-X7-X8-Gly-Ser-X9-Thr-Ser-Gly-Gly-Ser-Ser-Thr-Tyr-Gly-Tyr-Ser-Ser-X10-X11-X12-X13-Gly-X14-Val
摘要:
A solder paste using a Sn-Ag base, Sn-Cu base, or similar alloy powder has a high melting point, so it causes thermal damage to electronic devices. Sn-Ag-In base lead-free solder alloys having a low melting temperature have been studied, but they are difficult to use because they cause much occurrence of chips standing up during reflow. The present invention forms a solder paste by separating a Sn-Ag-In base lead-free solder into first and second solder alloy powders for which the difference in their peak temperatures measured by differential thermal analysis is at least 10°C and blends the mixed powders with a flux.
摘要:
The invention relates to positioning a cannula in a vein. A tab (11) is provided on a movable member (9, 10) comprising a wall (10) with a through-hole (12) therein for inserting a needle in such a way that inserting the needle into the through-hole holds the tab in a retaining position on a flange of the base (2) of a catheter (1), wherein said wall (10) is transversely slidably mounted in the chamber of the needle stick guard (6) relative to the needle between a lower retaining position and an upper release position so that when the needle is retracted into the guard and spaced back from said hole, the wall (10) that no longer has the needle extending therethrough can slide into the upper position thereof, thereby raising said tab above the flange of the base and enabling the guard to be separated from the catheter base. The invention is suitable for use in intravenous catheters.
摘要:
This invention relates to a slow and controlled-release polymeric fertilizer with multiple nutrients having the following general formula :
wherein n, m and M are defined in the description. The polymeric fertilizer of this invention is an environment-friendly slow and controlled-release fertilizer. Its slow and controlled release action lies in self-degradation and hydrolysis. This invention also relates to the preparing process for the fertilizer and the use method of the fertilizer in agriculture.
摘要:
This invention provides a dripping nozzle device to produce ADU particles with good sphericity, a device for recovering a feedstock liquid to prepare a uniform feedstock liquid, a device for supplying a feedstock liquid to form drops with a uniform volume, a device for solidifying the surfaces of drops so that the drops will not deform easily when they fall onto and hit the surface of an aqueous ammonia solution, a device for circulating an aqueous ammonia solution so that the uranyl nitrate in the drops can be changed to ammonium diuranate completely, to such an extent that uranyl nitrate in the center of each drop is changed to ammonium diuranate, and an apparatus for producing ammonium diuranate particles with good sphericity. The dripping nozzle device is provided with a single vibrator to vibrate nozzles simultaneously. The device for recovering a feedstock liquid recovers the feedstock liquid remaining in the nozzles and mixes it with a fresh feedstock liquid. The device for supplying a feedstock liquid is provided with a light irradiator for irradiating falling drops with light. The device for solidifying the surfaces of drops sprays ammonia gas over each of the paths along which the drops dripping from the nozzles fall. The device for circulating an aqueous ammonia solution enables drops to flow upward in the aqueous ammonia solution in the aqueous ammonia solution reservoir. The apparatus for producing ammonium diuranate utilizes these devices.
摘要:
Since conventional real estate portal sites are one-directionally provided by real estate portal site operators, wrong information may be provided. Also, since a large amount of real estate information must be frequently provided and changed, material and human resources must borne. Also, customers must visit corresponding real estate agents in order to obtain detailed information on the real estate they want after obtaining information on real estate through the Internet unless direct dealings are performed. It is an object of the present invention to provide a real estate information providing method through the network of member stores capable of letting sellers of real estate select whether to directly deal in the real estate through the Internet or to deal in the real estate through real estate agents connected to each other by network and of letting purchasers of real estate obtain detailed information on the real estate for sale through accessible member stores to deal in the real estate when the purchasers deal in the real estate through the member stores. It is another object of the present invention to provide a method of providing real estate information through the network of member stores in which member stores are classified by levels or regions to provide real estate information restricted by the levels or the regions of the member stores when the real estate for sale is requested to be searched.